/**
|
* \file
|
*
|
* Author:
|
* Mono Project (http://www.mono-project.com)
|
*
|
* Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
|
* Copyright 2004-2009 Novell, Inc (http://www.novell.com)
|
* Copyright 2011 Rodrigo Kumpera
|
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
|
*/
|
#include <config.h>
|
|
#include <mono/metadata/object-internals.h>
|
#include <mono/metadata/dynamic-image-internals.h>
|
#include <mono/metadata/verify.h>
|
#include <mono/metadata/verify-internals.h>
|
#include <mono/metadata/opcodes.h>
|
#include <mono/metadata/tabledefs.h>
|
#include <mono/metadata/reflection.h>
|
#include <mono/metadata/debug-helpers.h>
|
#include <mono/metadata/mono-endian.h>
|
#include <mono/metadata/metadata.h>
|
#include <mono/metadata/metadata-internals.h>
|
#include <mono/metadata/class-internals.h>
|
#include <mono/metadata/security-manager.h>
|
#include <mono/metadata/security-core-clr.h>
|
#include <mono/metadata/tokentype.h>
|
#include <mono/metadata/mono-basic-block.h>
|
#include <mono/metadata/attrdefs.h>
|
#include <mono/utils/mono-counters.h>
|
#include <mono/utils/monobitset.h>
|
#include <string.h>
|
#include <ctype.h>
|
|
static MiniVerifierMode verifier_mode = MONO_VERIFIER_MODE_OFF;
|
static gboolean verify_all = FALSE;
|
|
/*
|
* Set the desired level of checks for the verfier.
|
*
|
*/
|
void
|
mono_verifier_set_mode (MiniVerifierMode mode)
|
{
|
verifier_mode = mode;
|
}
|
|
void
|
mono_verifier_enable_verify_all ()
|
{
|
verify_all = TRUE;
|
}
|
|
#ifndef DISABLE_VERIFIER
|
/*
|
* Pull the list of opcodes
|
*/
|
#define OPDEF(a,b,c,d,e,f,g,h,i,j) \
|
a = i,
|
|
enum {
|
#include "mono/cil/opcode.def"
|
LAST = 0xff
|
};
|
#undef OPDEF
|
|
#ifdef MONO_VERIFIER_DEBUG
|
#define VERIFIER_DEBUG(code) do { code } while (0)
|
#else
|
#define VERIFIER_DEBUG(code)
|
#endif
|
|
//////////////////////////////////////////////////////////////////
|
#define IS_STRICT_MODE(ctx) (((ctx)->level & MONO_VERIFY_NON_STRICT) == 0)
|
#define IS_FAIL_FAST_MODE(ctx) (((ctx)->level & MONO_VERIFY_FAIL_FAST) == MONO_VERIFY_FAIL_FAST)
|
#define IS_SKIP_VISIBILITY(ctx) (((ctx)->level & MONO_VERIFY_SKIP_VISIBILITY) == MONO_VERIFY_SKIP_VISIBILITY)
|
#define IS_REPORT_ALL_ERRORS(ctx) (((ctx)->level & MONO_VERIFY_REPORT_ALL_ERRORS) == MONO_VERIFY_REPORT_ALL_ERRORS)
|
#define CLEAR_PREFIX(ctx, prefix) do { (ctx)->prefix_set &= ~(prefix); } while (0)
|
#define ADD_VERIFY_INFO(__ctx, __msg, __status, __exception) \
|
do { \
|
MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
|
vinfo->info.status = __status; \
|
vinfo->info.message = ( __msg ); \
|
vinfo->exception_type = (__exception); \
|
(__ctx)->list = g_slist_prepend ((__ctx)->list, vinfo); \
|
} while (0)
|
|
//TODO support MONO_VERIFY_REPORT_ALL_ERRORS
|
#define ADD_VERIFY_ERROR(__ctx, __msg) \
|
do { \
|
ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, MONO_EXCEPTION_INVALID_PROGRAM); \
|
(__ctx)->valid = 0; \
|
} while (0)
|
|
#define CODE_NOT_VERIFIABLE(__ctx, __msg) \
|
do { \
|
if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
|
ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, MONO_EXCEPTION_UNVERIFIABLE_IL); \
|
(__ctx)->verifiable = 0; \
|
if (IS_FAIL_FAST_MODE (__ctx)) \
|
(__ctx)->valid = 0; \
|
} \
|
} while (0)
|
|
#define ADD_VERIFY_ERROR2(__ctx, __msg, __exception) \
|
do { \
|
ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, __exception); \
|
(__ctx)->valid = 0; \
|
} while (0)
|
|
#define CODE_NOT_VERIFIABLE2(__ctx, __msg, __exception) \
|
do { \
|
if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
|
ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, __exception); \
|
(__ctx)->verifiable = 0; \
|
if (IS_FAIL_FAST_MODE (__ctx)) \
|
(__ctx)->valid = 0; \
|
} \
|
} while (0)
|
|
#define CHECK_ADD4_OVERFLOW_UN(a, b) ((guint32)(0xFFFFFFFFU) - (guint32)(b) < (guint32)(a))
|
#define CHECK_ADD8_OVERFLOW_UN(a, b) ((guint64)(0xFFFFFFFFFFFFFFFFUL) - (guint64)(b) < (guint64)(a))
|
|
#if SIZEOF_VOID_P == 4
|
#define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD4_OVERFLOW_UN(a, b)
|
#else
|
#define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD8_OVERFLOW_UN(a, b)
|
#endif
|
|
#define ADDP_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADDP_OVERFLOW_UN (a, b))
|
#define ADD_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADD4_OVERFLOW_UN (a, b))
|
|
/*Flags to be used with ILCodeDesc::flags */
|
enum {
|
/*Instruction has not been processed.*/
|
IL_CODE_FLAG_NOT_PROCESSED = 0,
|
/*Instruction was decoded by mono_method_verify loop.*/
|
IL_CODE_FLAG_SEEN = 1,
|
/*Instruction was target of a branch or is at a protected block boundary.*/
|
IL_CODE_FLAG_WAS_TARGET = 2,
|
/*Used by stack_init to avoid double initialize each entry.*/
|
IL_CODE_FLAG_STACK_INITED = 4,
|
/*Used by merge_stacks to decide if it should just copy the eval stack.*/
|
IL_CODE_STACK_MERGED = 8,
|
/*This instruction is part of the delegate construction sequence, it cannot be target of a branch.*/
|
IL_CODE_DELEGATE_SEQUENCE = 0x10,
|
/*This is a delegate created from a ldftn to a non final virtual method*/
|
IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL = 0x20,
|
/*This is a call to a non final virtual method*/
|
IL_CODE_CALL_NONFINAL_VIRTUAL = 0x40,
|
};
|
|
typedef enum {
|
RESULT_VALID,
|
RESULT_UNVERIFIABLE,
|
RESULT_INVALID
|
} verify_result_t;
|
|
typedef struct {
|
MonoType *type;
|
int stype;
|
MonoMethod *method;
|
} ILStackDesc;
|
|
|
typedef struct {
|
ILStackDesc *stack;
|
guint16 size, max_size;
|
guint16 flags;
|
} ILCodeDesc;
|
|
typedef struct {
|
int max_args;
|
int max_stack;
|
int verifiable;
|
int valid;
|
int level;
|
|
int code_size;
|
ILCodeDesc *code;
|
ILCodeDesc eval;
|
|
MonoType **params;
|
GSList *list;
|
/*Allocated fnptr MonoType that should be freed by us.*/
|
GSList *funptrs;
|
/*Type dup'ed exception types from catch blocks.*/
|
GSList *exception_types;
|
|
int num_locals;
|
MonoType **locals;
|
char *locals_verification_state;
|
|
/*TODO get rid of target here, need_merge in mono_method_verify and hoist the merging code in the branching code*/
|
int target;
|
|
guint32 ip_offset;
|
MonoMethodSignature *signature;
|
MonoMethodHeader *header;
|
|
MonoGenericContext *generic_context;
|
MonoImage *image;
|
MonoMethod *method;
|
|
/*This flag helps solving a corner case of delegate verification in that you cannot have a "starg 0"
|
*on a method that creates a delegate for a non-final virtual method using ldftn*/
|
gboolean has_this_store;
|
|
/*This flag is used to control if the contructor of the parent class has been called.
|
*If the this pointer is pushed on the eval stack and it's a reference type constructor and
|
* super_ctor_called is false, the uninitialized flag is set on the pushed value.
|
*
|
* Poping an uninitialized this ptr from the eval stack is an unverifiable operation unless
|
* the safe variant is used. Only a few opcodes can use it : dup, pop, ldfld, stfld and call to a constructor.
|
*/
|
gboolean super_ctor_called;
|
|
guint32 prefix_set;
|
gboolean has_flags;
|
MonoType *constrained_type;
|
} VerifyContext;
|
|
static void
|
merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external);
|
|
static int
|
get_stack_type (MonoType *type);
|
|
static gboolean
|
mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn);
|
|
static gboolean
|
mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass);
|
|
static gboolean
|
mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method);
|
|
static MonoGenericParam*
|
verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type);
|
|
static gboolean
|
verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate);
|
//////////////////////////////////////////////////////////////////
|
|
|
|
enum {
|
TYPE_INV = 0, /* leave at 0. */
|
TYPE_I4 = 1,
|
TYPE_I8 = 2,
|
TYPE_NATIVE_INT = 3,
|
TYPE_R8 = 4,
|
/* Used by operator tables to resolve pointer types (managed & unmanaged) and by unmanaged pointer types*/
|
TYPE_PTR = 5,
|
/* value types and classes */
|
TYPE_COMPLEX = 6,
|
/* Number of types, used to define the size of the tables*/
|
TYPE_MAX = 6,
|
|
/* Used by tables to signal that a result is not verifiable*/
|
NON_VERIFIABLE_RESULT = 0x80,
|
|
/*Mask used to extract just the type, excluding flags */
|
TYPE_MASK = 0x0F,
|
|
/* The stack type is a managed pointer, unmask the value to res */
|
POINTER_MASK = 0x100,
|
|
/*Stack type with the pointer mask*/
|
RAW_TYPE_MASK = 0x10F,
|
|
/* Controlled Mutability Manager Pointer */
|
CMMP_MASK = 0x200,
|
|
/* The stack type is a null literal*/
|
NULL_LITERAL_MASK = 0x400,
|
|
/**Used by ldarg.0 and family to let delegate verification happens.*/
|
THIS_POINTER_MASK = 0x800,
|
|
/**Signals that this is a boxed value type*/
|
BOXED_MASK = 0x1000,
|
|
/*This is an unitialized this ref*/
|
UNINIT_THIS_MASK = 0x2000,
|
|
/* This is a safe to return byref */
|
SAFE_BYREF_MASK = 0x4000,
|
};
|
|
static const char* const
|
type_names [TYPE_MAX + 1] = {
|
"Invalid",
|
"Int32",
|
"Int64",
|
"Native Int",
|
"Float64",
|
"Native Pointer",
|
"Complex"
|
};
|
|
enum {
|
PREFIX_UNALIGNED = 1,
|
PREFIX_VOLATILE = 2,
|
PREFIX_TAIL = 4,
|
PREFIX_CONSTRAINED = 8,
|
PREFIX_READONLY = 16
|
};
|
//////////////////////////////////////////////////////////////////
|
|
#ifdef ENABLE_VERIFIER_STATS
|
|
#define _MEM_ALLOC(amt) do { allocated_memory += (amt); working_set += (amt); } while (0)
|
#define _MEM_FREE(amt) do { working_set -= (amt); } while (0)
|
|
static int allocated_memory;
|
static int working_set;
|
static int max_allocated_memory;
|
static int max_working_set;
|
static int total_allocated_memory;
|
|
static void
|
finish_collect_stats (void)
|
{
|
max_allocated_memory = MAX (max_allocated_memory, allocated_memory);
|
max_working_set = MAX (max_working_set, working_set);
|
total_allocated_memory += allocated_memory;
|
allocated_memory = working_set = 0;
|
}
|
|
static void
|
init_verifier_stats (void)
|
{
|
static gboolean inited;
|
if (!inited) {
|
inited = TRUE;
|
mono_counters_register ("Maximum memory allocated during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_allocated_memory);
|
mono_counters_register ("Maximum memory used during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_working_set);
|
mono_counters_register ("Total memory allocated for verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &total_allocated_memory);
|
}
|
}
|
|
#else
|
|
#define _MEM_ALLOC(amt) do {} while (0)
|
#define _MEM_FREE(amt) do { } while (0)
|
|
#define finish_collect_stats()
|
#define init_verifier_stats()
|
|
#endif
|
|
|
//////////////////////////////////////////////////////////////////
|
|
|
/*Token validation macros and functions */
|
#define IS_MEMBER_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_MEMBERREF)
|
#define IS_METHOD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
|
#define IS_METHOD_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_METHODSPEC)
|
#define IS_FIELD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_FIELD)
|
|
#define IS_TYPE_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEREF)
|
#define IS_TYPE_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEDEF)
|
#define IS_TYPE_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPESPEC)
|
#define IS_METHOD_DEF_OR_REF_OR_SPEC(token) (IS_METHOD_DEF (token) || IS_MEMBER_REF (token) || IS_METHOD_SPEC (token))
|
#define IS_TYPE_DEF_OR_REF_OR_SPEC(token) (IS_TYPE_DEF (token) || IS_TYPE_REF (token) || IS_TYPE_SPEC (token))
|
#define IS_FIELD_DEF_OR_REF(token) (IS_FIELD_DEF (token) || IS_MEMBER_REF (token))
|
|
/*
|
* Verify if @token refers to a valid row on int's table.
|
*/
|
static gboolean
|
token_bounds_check (MonoImage *image, guint32 token)
|
{
|
if (image_is_dynamic (image))
|
return mono_dynamic_image_is_valid_token ((MonoDynamicImage*)image, token);
|
return image->tables [mono_metadata_token_table (token)].rows >= mono_metadata_token_index (token) && mono_metadata_token_index (token) > 0;
|
}
|
|
static MonoType *
|
mono_type_create_fnptr_from_mono_method (VerifyContext *ctx, MonoMethod *method)
|
{
|
MonoType *res = g_new0 (MonoType, 1);
|
_MEM_ALLOC (sizeof (MonoType));
|
|
//FIXME use mono_method_get_signature_full
|
res->data.method = mono_method_signature (method);
|
res->type = MONO_TYPE_FNPTR;
|
ctx->funptrs = g_slist_prepend (ctx->funptrs, res);
|
return res;
|
}
|
|
/*
|
* mono_type_is_enum_type:
|
*
|
* Returns: TRUE if @type is an enum type.
|
*/
|
static gboolean
|
mono_type_is_enum_type (MonoType *type)
|
{
|
if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
|
return TRUE;
|
if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
|
return TRUE;
|
return FALSE;
|
}
|
|
/*
|
* mono_type_is_value_type:
|
*
|
* Returns: TRUE if @type is named after @namespace.@name.
|
*
|
*/
|
static gboolean
|
mono_type_is_value_type (MonoType *type, const char *namespace_, const char *name)
|
{
|
return type->type == MONO_TYPE_VALUETYPE &&
|
!strcmp (namespace_, type->data.klass->name_space) &&
|
!strcmp (name, type->data.klass->name);
|
}
|
|
/*
|
* Returns TURE if @type is VAR or MVAR
|
*/
|
static gboolean
|
mono_type_is_generic_argument (MonoType *type)
|
{
|
return type->type == MONO_TYPE_VAR || type->type == MONO_TYPE_MVAR;
|
}
|
|
/*
|
* mono_type_get_underlying_type_any:
|
*
|
* This functions is just like mono_type_get_underlying_type but it doesn't care if the type is byref.
|
*
|
* Returns the underlying type of @type regardless if it is byref or not.
|
*/
|
static MonoType*
|
mono_type_get_underlying_type_any (MonoType *type)
|
{
|
if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
|
return mono_class_enum_basetype (type->data.klass);
|
if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
|
return mono_class_enum_basetype (type->data.generic_class->container_class);
|
return type;
|
}
|
|
static G_GNUC_UNUSED const char*
|
mono_type_get_stack_name (MonoType *type)
|
{
|
return type_names [get_stack_type (type) & TYPE_MASK];
|
}
|
|
#define CTOR_REQUIRED_FLAGS (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_RT_SPECIAL_NAME)
|
#define CTOR_INVALID_FLAGS (METHOD_ATTRIBUTE_STATIC)
|
|
static gboolean
|
mono_method_is_constructor (MonoMethod *method)
|
{
|
return ((method->flags & CTOR_REQUIRED_FLAGS) == CTOR_REQUIRED_FLAGS &&
|
!(method->flags & CTOR_INVALID_FLAGS) &&
|
!strcmp (".ctor", method->name));
|
}
|
|
static gboolean
|
mono_class_has_default_constructor (MonoClass *klass)
|
{
|
MonoMethod *method;
|
int i;
|
|
mono_class_setup_methods (klass);
|
if (mono_class_has_failure (klass))
|
return FALSE;
|
|
int mcount = mono_class_get_method_count (klass);
|
for (i = 0; i < mcount; ++i) {
|
method = klass->methods [i];
|
if (mono_method_is_constructor (method) &&
|
mono_method_signature (method) &&
|
mono_method_signature (method)->param_count == 0 &&
|
(method->flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK) == METHOD_ATTRIBUTE_PUBLIC)
|
return TRUE;
|
}
|
return FALSE;
|
}
|
|
/*
|
* Verify if @type is valid for the given @ctx verification context.
|
* this function checks for VAR and MVAR types that are invalid under the current verifier,
|
*/
|
static gboolean
|
mono_type_is_valid_type_in_context_full (MonoType *type, MonoGenericContext *context, gboolean check_gtd)
|
{
|
int i;
|
MonoGenericInst *inst;
|
|
switch (type->type) {
|
case MONO_TYPE_VAR:
|
case MONO_TYPE_MVAR:
|
if (!context)
|
return FALSE;
|
inst = type->type == MONO_TYPE_VAR ? context->class_inst : context->method_inst;
|
if (!inst || mono_type_get_generic_param_num (type) >= inst->type_argc)
|
return FALSE;
|
break;
|
case MONO_TYPE_SZARRAY:
|
return mono_type_is_valid_type_in_context_full (&type->data.klass->byval_arg, context, check_gtd);
|
case MONO_TYPE_ARRAY:
|
return mono_type_is_valid_type_in_context_full (&type->data.array->eklass->byval_arg, context, check_gtd);
|
case MONO_TYPE_PTR:
|
return mono_type_is_valid_type_in_context_full (type->data.type, context, check_gtd);
|
case MONO_TYPE_GENERICINST:
|
inst = type->data.generic_class->context.class_inst;
|
if (!inst->is_open)
|
break;
|
for (i = 0; i < inst->type_argc; ++i)
|
if (!mono_type_is_valid_type_in_context_full (inst->type_argv [i], context, check_gtd))
|
return FALSE;
|
break;
|
case MONO_TYPE_CLASS:
|
case MONO_TYPE_VALUETYPE: {
|
MonoClass *klass = type->data.klass;
|
/*
|
* It's possible to encode generic'sh types in such a way that they disguise themselves as class or valuetype.
|
* Fixing the type decoding is really tricky since under some cases this behavior is needed, for example, to
|
* have a 'class' type pointing to a 'genericinst' class.
|
*
|
* For the runtime these non canonical (weird) encodings work fine, the worst they can cause is some
|
* reflection oddities which are harmless - to security at least.
|
*/
|
if (klass->byval_arg.type != type->type)
|
return mono_type_is_valid_type_in_context_full (&klass->byval_arg, context, check_gtd);
|
|
if (check_gtd && mono_class_is_gtd (klass))
|
return FALSE;
|
break;
|
}
|
default:
|
break;
|
}
|
return TRUE;
|
}
|
|
static gboolean
|
mono_type_is_valid_type_in_context (MonoType *type, MonoGenericContext *context)
|
{
|
return mono_type_is_valid_type_in_context_full (type, context, FALSE);
|
}
|
|
/*This function returns NULL if the type is not instantiatable*/
|
static MonoType*
|
verifier_inflate_type (VerifyContext *ctx, MonoType *type, MonoGenericContext *context)
|
{
|
MonoError error;
|
MonoType *result;
|
|
result = mono_class_inflate_generic_type_checked (type, context, &error);
|
if (!mono_error_ok (&error)) {
|
mono_error_cleanup (&error);
|
return NULL;
|
}
|
return result;
|
}
|
|
/*A side note here. We don't need to check if arguments are broken since this
|
is only need to be done by the runtime before realizing the type.
|
*/
|
static gboolean
|
is_valid_generic_instantiation (MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
|
{
|
MonoError error;
|
int i;
|
|
if (ginst->type_argc != gc->type_argc)
|
return FALSE;
|
|
for (i = 0; i < gc->type_argc; ++i) {
|
MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
|
MonoClass *paramClass;
|
MonoClass **constraints;
|
MonoType *param_type = ginst->type_argv [i];
|
|
/*it's not our job to validate type variables*/
|
if (mono_type_is_generic_argument (param_type))
|
continue;
|
|
paramClass = mono_class_from_mono_type (param_type);
|
|
|
/* A GTD can't be a generic argument.
|
*
|
* Due to how types are encoded we must check for the case of a genericinst MonoType and GTD MonoClass.
|
* This happens in cases such as: class Foo<T> { void X() { new Bar<T> (); } }
|
*
|
* Open instantiations can have GTDs as this happens when one type is instantiated with others params
|
* and the former has an expansion into the later. For example:
|
* class B<K> {}
|
* class A<T>: B<K> {}
|
* The type A <K> has a parent B<K>, that is inflated into the GTD B<>.
|
* Since A<K> is open, thus not instantiatable, this is valid.
|
*/
|
if (mono_class_is_gtd (paramClass) && param_type->type != MONO_TYPE_GENERICINST && !ginst->is_open)
|
return FALSE;
|
|
/*it's not safe to call mono_class_init from here*/
|
if (mono_class_is_ginst (paramClass) && !paramClass->inited) {
|
if (!mono_class_is_valid_generic_instantiation (NULL, paramClass))
|
return FALSE;
|
}
|
|
if (!param_info->constraints && !(param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK))
|
continue;
|
|
if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && (!paramClass->valuetype || mono_class_is_nullable (paramClass)))
|
return FALSE;
|
|
if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && paramClass->valuetype)
|
return FALSE;
|
|
if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !paramClass->valuetype && !mono_class_has_default_constructor (paramClass))
|
return FALSE;
|
|
if (!param_info->constraints)
|
continue;
|
|
for (constraints = param_info->constraints; *constraints; ++constraints) {
|
MonoClass *ctr = *constraints;
|
MonoType *inflated;
|
|
inflated = mono_class_inflate_generic_type_checked (&ctr->byval_arg, context, &error);
|
if (!mono_error_ok (&error)) {
|
mono_error_cleanup (&error);
|
return FALSE;
|
}
|
ctr = mono_class_from_mono_type (inflated);
|
mono_metadata_free_type (inflated);
|
|
/*FIXME maybe we need the same this as verifier_class_is_assignable_from*/
|
if (!mono_class_is_assignable_from_slow (ctr, paramClass))
|
return FALSE;
|
}
|
}
|
return TRUE;
|
}
|
|
/**
|
* mono_generic_param_is_constraint_compatible:
|
*
|
* \returns TRUE if \p candidate is constraint compatible with \p target.
|
*
|
* This means that \p candidate constraints are a super set of \p target constaints
|
*/
|
static gboolean
|
mono_generic_param_is_constraint_compatible (VerifyContext *ctx, MonoGenericParam *target, MonoGenericParam *candidate, MonoClass *candidate_param_class, MonoGenericContext *context)
|
{
|
MonoGenericParamInfo *tinfo = mono_generic_param_info (target);
|
MonoGenericParamInfo *cinfo = mono_generic_param_info (candidate);
|
MonoClass **candidate_class;
|
gboolean class_constraint_satisfied = FALSE;
|
gboolean valuetype_constraint_satisfied = FALSE;
|
|
int tmask = tinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
|
int cmask = cinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
|
|
if (cinfo->constraints) {
|
for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
|
MonoClass *cc;
|
MonoType *inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
|
if (!inflated)
|
return FALSE;
|
cc = mono_class_from_mono_type (inflated);
|
mono_metadata_free_type (inflated);
|
|
if (mono_type_is_reference (&cc->byval_arg) && !MONO_CLASS_IS_INTERFACE (cc))
|
class_constraint_satisfied = TRUE;
|
else if (!mono_type_is_reference (&cc->byval_arg) && !MONO_CLASS_IS_INTERFACE (cc))
|
valuetype_constraint_satisfied = TRUE;
|
}
|
}
|
class_constraint_satisfied |= (cmask & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) != 0;
|
valuetype_constraint_satisfied |= (cmask & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) != 0;
|
|
if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && !class_constraint_satisfied)
|
return FALSE;
|
if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && !valuetype_constraint_satisfied)
|
return FALSE;
|
if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !((cmask & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) ||
|
valuetype_constraint_satisfied)) {
|
return FALSE;
|
}
|
|
|
if (tinfo->constraints) {
|
MonoClass **target_class;
|
for (target_class = tinfo->constraints; *target_class; ++target_class) {
|
MonoClass *tc;
|
MonoType *inflated = verifier_inflate_type (ctx, &(*target_class)->byval_arg, context);
|
if (!inflated)
|
return FALSE;
|
tc = mono_class_from_mono_type (inflated);
|
mono_metadata_free_type (inflated);
|
|
/*
|
* A constraint from @target might inflate into @candidate itself and in that case we don't need
|
* check it's constraints since it satisfy the constraint by itself.
|
*/
|
if (mono_metadata_type_equal (&tc->byval_arg, &candidate_param_class->byval_arg))
|
continue;
|
|
if (!cinfo->constraints)
|
return FALSE;
|
|
for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
|
MonoClass *cc;
|
inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
|
if (!inflated)
|
return FALSE;
|
cc = mono_class_from_mono_type (inflated);
|
mono_metadata_free_type (inflated);
|
|
if (verifier_class_is_assignable_from (tc, cc))
|
break;
|
|
/*
|
* This happens when we have the following:
|
*
|
* Bar<K> where K : IFace
|
* Foo<T, U> where T : U where U : IFace
|
* ...
|
* Bar<T> <- T here satisfy K constraint transitively through to U's constraint
|
*
|
*/
|
if (mono_type_is_generic_argument (&cc->byval_arg)) {
|
MonoGenericParam *other_candidate = verifier_get_generic_param_from_type (ctx, &cc->byval_arg);
|
|
if (mono_generic_param_is_constraint_compatible (ctx, target, other_candidate, cc, context)) {
|
break;
|
}
|
}
|
}
|
if (!*candidate_class)
|
return FALSE;
|
}
|
}
|
return TRUE;
|
}
|
|
static MonoGenericParam*
|
verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type)
|
{
|
MonoGenericContainer *gc;
|
MonoMethod *method = ctx->method;
|
int num;
|
|
num = mono_type_get_generic_param_num (type);
|
|
if (type->type == MONO_TYPE_VAR) {
|
MonoClass *gtd = method->klass;
|
if (mono_class_is_ginst (gtd))
|
gtd = mono_class_get_generic_class (gtd)->container_class;
|
gc = mono_class_try_get_generic_container (gtd);
|
} else { //MVAR
|
MonoMethod *gmd = method;
|
if (method->is_inflated)
|
gmd = ((MonoMethodInflated*)method)->declaring;
|
gc = mono_method_get_generic_container (gmd);
|
}
|
if (!gc)
|
return NULL;
|
return mono_generic_container_get_param (gc, num);
|
}
|
|
|
|
/*
|
* Verify if @type is valid for the given @ctx verification context.
|
* this function checks for VAR and MVAR types that are invalid under the current verifier,
|
* This means that it either
|
*/
|
static gboolean
|
is_valid_type_in_context (VerifyContext *ctx, MonoType *type)
|
{
|
return mono_type_is_valid_type_in_context (type, ctx->generic_context);
|
}
|
|
static gboolean
|
is_valid_generic_instantiation_in_context (VerifyContext *ctx, MonoGenericInst *ginst, gboolean check_gtd)
|
{
|
int i;
|
for (i = 0; i < ginst->type_argc; ++i) {
|
MonoType *type = ginst->type_argv [i];
|
|
if (!mono_type_is_valid_type_in_context_full (type, ctx->generic_context, TRUE))
|
return FALSE;
|
}
|
return TRUE;
|
}
|
|
static gboolean
|
generic_arguments_respect_constraints (VerifyContext *ctx, MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
|
{
|
int i;
|
for (i = 0; i < ginst->type_argc; ++i) {
|
MonoType *type = ginst->type_argv [i];
|
MonoGenericParam *target = mono_generic_container_get_param (gc, i);
|
MonoGenericParam *candidate;
|
MonoClass *candidate_class;
|
|
if (!mono_type_is_generic_argument (type))
|
continue;
|
|
if (!is_valid_type_in_context (ctx, type))
|
return FALSE;
|
|
candidate = verifier_get_generic_param_from_type (ctx, type);
|
candidate_class = mono_class_from_mono_type (type);
|
|
if (!mono_generic_param_is_constraint_compatible (ctx, target, candidate, candidate_class, context))
|
return FALSE;
|
}
|
return TRUE;
|
}
|
|
static gboolean
|
mono_method_repect_method_constraints (VerifyContext *ctx, MonoMethod *method)
|
{
|
MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
|
MonoGenericInst *ginst = gmethod->context.method_inst;
|
MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
|
return !gc || generic_arguments_respect_constraints (ctx, gc, &gmethod->context, ginst);
|
}
|
|
static gboolean
|
mono_class_repect_method_constraints (VerifyContext *ctx, MonoClass *klass)
|
{
|
MonoGenericClass *gklass = mono_class_get_generic_class (klass);
|
MonoGenericInst *ginst = gklass->context.class_inst;
|
MonoGenericContainer *gc = mono_class_get_generic_container (gklass->container_class);
|
return !gc || generic_arguments_respect_constraints (ctx, gc, &gklass->context, ginst);
|
}
|
|
static gboolean
|
mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method)
|
{
|
MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
|
MonoGenericInst *ginst = gmethod->context.method_inst;
|
MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
|
if (!gc) /*non-generic inflated method - it's part of a generic type */
|
return TRUE;
|
if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst, TRUE))
|
return FALSE;
|
return is_valid_generic_instantiation (gc, &gmethod->context, ginst);
|
|
}
|
|
static gboolean
|
mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass)
|
{
|
MonoGenericClass *gklass = mono_class_get_generic_class (klass);
|
MonoGenericInst *ginst = gklass->context.class_inst;
|
MonoGenericContainer *gc = mono_class_get_generic_container (gklass->container_class);
|
if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst, TRUE))
|
return FALSE;
|
return is_valid_generic_instantiation (gc, &gklass->context, ginst);
|
}
|
|
static gboolean
|
mono_type_is_valid_in_context (VerifyContext *ctx, MonoType *type)
|
{
|
MonoClass *klass;
|
|
if (type == NULL) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid null type at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return FALSE;
|
}
|
|
if (!is_valid_type_in_context (ctx, type)) {
|
char *str = mono_type_full_name (type);
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type (%s%s) (argument out of range or %s is not generic) at 0x%04x",
|
str [0] == '!' ? "" : type->type == MONO_TYPE_VAR ? "!" : "!!",
|
str,
|
type->type == MONO_TYPE_VAR ? "class" : "method",
|
ctx->ip_offset),
|
MONO_EXCEPTION_BAD_IMAGE);
|
g_free (str);
|
return FALSE;
|
}
|
|
klass = mono_class_from_mono_type (type);
|
mono_class_init (klass);
|
if (mono_class_has_failure (klass)) {
|
if (mono_class_is_ginst (klass) && !mono_class_is_valid_generic_instantiation (NULL, klass))
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
|
else
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
|
return FALSE;
|
}
|
|
if (mono_class_is_ginst (klass) && mono_class_has_failure (mono_class_get_generic_class (klass)->container_class)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
|
return FALSE;
|
}
|
|
if (!mono_class_is_ginst (klass))
|
return TRUE;
|
|
if (!mono_class_is_valid_generic_instantiation (ctx, klass)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
|
return FALSE;
|
}
|
|
if (!mono_class_repect_method_constraints (ctx, klass)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s (generic args don't respect target's constraints) at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
|
return FALSE;
|
}
|
|
return TRUE;
|
}
|
|
static verify_result_t
|
mono_method_is_valid_in_context (VerifyContext *ctx, MonoMethod *method)
|
{
|
if (!mono_type_is_valid_in_context (ctx, &method->klass->byval_arg))
|
return RESULT_INVALID;
|
|
if (!method->is_inflated)
|
return RESULT_VALID;
|
|
if (!mono_method_is_valid_generic_instantiation (ctx, method)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset), MONO_EXCEPTION_UNVERIFIABLE_IL);
|
return RESULT_INVALID;
|
}
|
|
if (!mono_method_repect_method_constraints (ctx, method)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s (generic args don't respect target's constraints) at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset));
|
return RESULT_UNVERIFIABLE;
|
}
|
return RESULT_VALID;
|
}
|
|
|
static MonoClassField*
|
verifier_load_field (VerifyContext *ctx, int token, MonoClass **out_klass, const char *opcode) {
|
MonoError error;
|
MonoClassField *field;
|
MonoClass *klass = NULL;
|
|
if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
|
field = (MonoClassField *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
|
klass = field ? field->parent : NULL;
|
} else {
|
if (!IS_FIELD_DEF_OR_REF (token) || !token_bounds_check (ctx->image, token)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid field token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
|
field = mono_field_from_token_checked (ctx->image, token, &klass, ctx->generic_context, &error);
|
mono_error_cleanup (&error); /*FIXME don't swallow the error */
|
}
|
|
if (!field || !field->parent || !klass) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load field from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
|
if (!mono_type_is_valid_in_context (ctx, &klass->byval_arg))
|
return NULL;
|
|
if (mono_field_get_flags (field) & FIELD_ATTRIBUTE_LITERAL) {
|
char *type_name = mono_type_get_full_name (field->parent);
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot reference literal field %s::%s at 0x%04x", type_name, field->name, ctx->ip_offset));
|
g_free (type_name);
|
return NULL;
|
}
|
|
*out_klass = klass;
|
return field;
|
}
|
|
static MonoMethod*
|
verifier_load_method (VerifyContext *ctx, int token, const char *opcode) {
|
MonoMethod* method;
|
|
|
if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
|
method = (MonoMethod *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
|
} else {
|
MonoError error;
|
if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid method token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
|
method = mono_get_method_checked (ctx->image, token, NULL, ctx->generic_context, &error);
|
mono_error_cleanup (&error); /* FIXME don't swallow this error */
|
}
|
|
if (!method) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load method from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
|
if (mono_method_is_valid_in_context (ctx, method) == RESULT_INVALID)
|
return NULL;
|
|
return method;
|
}
|
|
static MonoType*
|
verifier_load_type (VerifyContext *ctx, int token, const char *opcode) {
|
MonoType* type;
|
|
if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
|
MonoClass *klass = (MonoClass *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
|
type = klass ? &klass->byval_arg : NULL;
|
} else {
|
MonoError error;
|
if (!IS_TYPE_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid type token 0x%08x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
type = mono_type_get_checked (ctx->image, token, ctx->generic_context, &error);
|
mono_error_cleanup (&error); /*FIXME don't swallow the error */
|
}
|
|
if (!type) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load type from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return NULL;
|
}
|
|
if (!mono_type_is_valid_in_context (ctx, type))
|
return NULL;
|
|
return type;
|
}
|
|
|
/* stack_slot_get_type:
|
*
|
* Returns the stack type of @value. This value includes POINTER_MASK.
|
*
|
* Use this function to checks that account for a managed pointer.
|
*/
|
static gint32
|
stack_slot_get_type (ILStackDesc *value)
|
{
|
return value->stype & RAW_TYPE_MASK;
|
}
|
|
/* stack_slot_get_underlying_type:
|
*
|
* Returns the stack type of @value. This value does not include POINTER_MASK.
|
*
|
* Use this function is cases where the fact that the value could be a managed pointer is
|
* irrelevant. For example, field load doesn't care about this fact of type on stack.
|
*/
|
static gint32
|
stack_slot_get_underlying_type (ILStackDesc *value)
|
{
|
return value->stype & TYPE_MASK;
|
}
|
|
/* stack_slot_is_managed_pointer:
|
*
|
* Returns TRUE is @value is a managed pointer.
|
*/
|
static gboolean
|
stack_slot_is_managed_pointer (ILStackDesc *value)
|
{
|
return (value->stype & POINTER_MASK) == POINTER_MASK;
|
}
|
|
/* stack_slot_is_managed_mutability_pointer:
|
*
|
* Returns TRUE is @value is a managed mutability pointer.
|
*/
|
static G_GNUC_UNUSED gboolean
|
stack_slot_is_managed_mutability_pointer (ILStackDesc *value)
|
{
|
return (value->stype & CMMP_MASK) == CMMP_MASK;
|
}
|
|
/* stack_slot_is_null_literal:
|
*
|
* Returns TRUE is @value is the null literal.
|
*/
|
static gboolean
|
stack_slot_is_null_literal (ILStackDesc *value)
|
{
|
return (value->stype & NULL_LITERAL_MASK) == NULL_LITERAL_MASK;
|
}
|
|
|
/* stack_slot_is_this_pointer:
|
*
|
* Returns TRUE is @value is the this literal
|
*/
|
static gboolean
|
stack_slot_is_this_pointer (ILStackDesc *value)
|
{
|
return (value->stype & THIS_POINTER_MASK) == THIS_POINTER_MASK;
|
}
|
|
/* stack_slot_is_boxed_value:
|
*
|
* Returns TRUE is @value is a boxed value
|
*/
|
static gboolean
|
stack_slot_is_boxed_value (ILStackDesc *value)
|
{
|
return (value->stype & BOXED_MASK) == BOXED_MASK;
|
}
|
|
/* stack_slot_is_safe_byref:
|
*
|
* Returns TRUE is @value is a safe byref
|
*/
|
static gboolean
|
stack_slot_is_safe_byref (ILStackDesc *value)
|
{
|
return (value->stype & SAFE_BYREF_MASK) == SAFE_BYREF_MASK;
|
}
|
|
static const char *
|
stack_slot_get_name (ILStackDesc *value)
|
{
|
return type_names [value->stype & TYPE_MASK];
|
}
|
|
enum {
|
SAFE_BYREF_LOCAL = 1,
|
UNSAFE_BYREF_LOCAL = 2
|
};
|
static gboolean
|
local_is_safe_byref (VerifyContext *ctx, unsigned int arg)
|
{
|
return ctx->locals_verification_state [arg] == SAFE_BYREF_LOCAL;
|
}
|
|
static gboolean
|
local_is_unsafe_byref (VerifyContext *ctx, unsigned int arg)
|
{
|
return ctx->locals_verification_state [arg] == UNSAFE_BYREF_LOCAL;
|
}
|
|
#define APPEND_WITH_PREDICATE(PRED,NAME) do {\
|
if (PRED (value)) { \
|
if (!first) \
|
g_string_append (str, ", "); \
|
g_string_append (str, NAME); \
|
first = FALSE; \
|
} } while (0)
|
|
static char*
|
stack_slot_stack_type_full_name (ILStackDesc *value)
|
{
|
GString *str = g_string_new ("");
|
char *result;
|
gboolean has_pred = FALSE, first = TRUE;
|
|
if ((value->stype & TYPE_MASK) != value->stype) {
|
g_string_append(str, "[");
|
APPEND_WITH_PREDICATE (stack_slot_is_this_pointer, "this");
|
APPEND_WITH_PREDICATE (stack_slot_is_boxed_value, "boxed");
|
APPEND_WITH_PREDICATE (stack_slot_is_null_literal, "null");
|
APPEND_WITH_PREDICATE (stack_slot_is_managed_mutability_pointer, "cmmp");
|
APPEND_WITH_PREDICATE (stack_slot_is_managed_pointer, "mp");
|
APPEND_WITH_PREDICATE (stack_slot_is_safe_byref, "safe-byref");
|
has_pred = TRUE;
|
}
|
|
if (mono_type_is_generic_argument (value->type) && !stack_slot_is_boxed_value (value)) {
|
if (!has_pred)
|
g_string_append(str, "[");
|
if (!first)
|
g_string_append (str, ", ");
|
g_string_append (str, "unboxed");
|
has_pred = TRUE;
|
}
|
|
if (has_pred)
|
g_string_append(str, "] ");
|
|
g_string_append (str, stack_slot_get_name (value));
|
result = str->str;
|
g_string_free (str, FALSE);
|
return result;
|
}
|
|
static char*
|
stack_slot_full_name (ILStackDesc *value)
|
{
|
char *type_name = mono_type_full_name (value->type);
|
char *stack_name = stack_slot_stack_type_full_name (value);
|
char *res = g_strdup_printf ("%s (%s)", type_name, stack_name);
|
g_free (type_name);
|
g_free (stack_name);
|
return res;
|
}
|
|
//////////////////////////////////////////////////////////////////
|
|
/**
|
* mono_free_verify_list:
|
*/
|
void
|
mono_free_verify_list (GSList *list)
|
{
|
MonoVerifyInfoExtended *info;
|
GSList *tmp;
|
|
for (tmp = list; tmp; tmp = tmp->next) {
|
info = (MonoVerifyInfoExtended *)tmp->data;
|
g_free (info->info.message);
|
g_free (info);
|
}
|
g_slist_free (list);
|
}
|
|
#define ADD_ERROR(list,msg) \
|
do { \
|
MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
|
vinfo->info.status = MONO_VERIFY_ERROR; \
|
vinfo->info.message = (msg); \
|
(list) = g_slist_prepend ((list), vinfo); \
|
} while (0)
|
|
#define ADD_WARN(list,code,msg) \
|
do { \
|
MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
|
vinfo->info.status = (code); \
|
vinfo->info.message = (msg); \
|
(list) = g_slist_prepend ((list), vinfo); \
|
} while (0)
|
|
#define ADD_INVALID(list,msg) \
|
do { \
|
MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
|
vinfo->status = MONO_VERIFY_ERROR; \
|
vinfo->message = (msg); \
|
(list) = g_slist_prepend ((list), vinfo); \
|
/*G_BREAKPOINT ();*/ \
|
goto invalid_cil; \
|
} while (0)
|
|
#define CHECK_STACK_UNDERFLOW(num) \
|
do { \
|
if (cur_stack < (num)) \
|
ADD_INVALID (list, g_strdup_printf ("Stack underflow at 0x%04x (%d items instead of %d)", ip_offset, cur_stack, (num))); \
|
} while (0)
|
|
#define CHECK_STACK_OVERFLOW() \
|
do { \
|
if (cur_stack >= max_stack) \
|
ADD_INVALID (list, g_strdup_printf ("Maxstack exceeded at 0x%04x", ip_offset)); \
|
} while (0)
|
|
|
static int
|
in_any_block (MonoMethodHeader *header, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
if (MONO_OFFSET_IN_CLAUSE (clause, offset))
|
return 1;
|
if (MONO_OFFSET_IN_HANDLER (clause, offset))
|
return 1;
|
if (MONO_OFFSET_IN_FILTER (clause, offset))
|
return 1;
|
}
|
return 0;
|
}
|
|
/*
|
* in_any_exception_block:
|
*
|
* Returns TRUE is @offset is part of any exception clause (filter, handler, catch, finally or fault).
|
*/
|
static gboolean
|
in_any_exception_block (MonoMethodHeader *header, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
if (MONO_OFFSET_IN_HANDLER (clause, offset))
|
return TRUE;
|
if (MONO_OFFSET_IN_FILTER (clause, offset))
|
return TRUE;
|
}
|
return FALSE;
|
}
|
|
/*
|
* is_valid_branch_instruction:
|
*
|
* Verify if it's valid to perform a branch from @offset to @target.
|
* This should be used with br and brtrue/false.
|
* It returns 0 if valid, 1 for unverifiable and 2 for invalid.
|
* The major difference from other similiar functions is that branching into a
|
* finally/fault block is invalid instead of just unverifiable.
|
*/
|
static int
|
is_valid_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
/*branching into a finally block is invalid*/
|
if ((clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY || clause->flags == MONO_EXCEPTION_CLAUSE_FAULT) &&
|
!MONO_OFFSET_IN_HANDLER (clause, offset) &&
|
MONO_OFFSET_IN_HANDLER (clause, target))
|
return 2;
|
|
if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
|
return 1;
|
if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
|
return 1;
|
if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
|
return 1;
|
}
|
return 0;
|
}
|
|
/*
|
* is_valid_cmp_branch_instruction:
|
*
|
* Verify if it's valid to perform a branch from @offset to @target.
|
* This should be used with binary comparison branching instruction, like beq, bge and similars.
|
* It returns 0 if valid, 1 for unverifiable and 2 for invalid.
|
*
|
* The major differences from other similar functions are that most errors lead to invalid
|
* code and only branching out of finally, filter or fault clauses is unverifiable.
|
*/
|
static int
|
is_valid_cmp_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
/*branching out of a handler or finally*/
|
if (clause->flags != MONO_EXCEPTION_CLAUSE_NONE &&
|
MONO_OFFSET_IN_HANDLER (clause, offset) &&
|
!MONO_OFFSET_IN_HANDLER (clause, target))
|
return 1;
|
|
if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
|
return 2;
|
if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
|
return 2;
|
if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
|
return 2;
|
}
|
return 0;
|
}
|
|
/*
|
* A leave can't escape a finally block
|
*/
|
static int
|
is_correct_leave (MonoMethodHeader *header, guint offset, guint target)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY && MONO_OFFSET_IN_HANDLER (clause, offset) && !MONO_OFFSET_IN_HANDLER (clause, target))
|
return 0;
|
if (MONO_OFFSET_IN_FILTER (clause, offset))
|
return 0;
|
}
|
return 1;
|
}
|
|
/*
|
* A rethrow can't happen outside of a catch handler.
|
*/
|
static int
|
is_correct_rethrow (MonoMethodHeader *header, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
if (MONO_OFFSET_IN_HANDLER (clause, offset))
|
return 1;
|
}
|
return 0;
|
}
|
|
/*
|
* An endfinally can't happen outside of a finally/fault handler.
|
*/
|
static int
|
is_correct_endfinally (MonoMethodHeader *header, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < header->num_clauses; ++i) {
|
clause = &header->clauses [i];
|
if (MONO_OFFSET_IN_HANDLER (clause, offset) && (clause->flags == MONO_EXCEPTION_CLAUSE_FAULT || clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY))
|
return 1;
|
}
|
return 0;
|
}
|
|
|
/*
|
* An endfilter can only happens inside a filter clause.
|
* In non-strict mode filter is allowed inside the handler clause too
|
*/
|
static MonoExceptionClause *
|
is_correct_endfilter (VerifyContext *ctx, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < ctx->header->num_clauses; ++i) {
|
clause = &ctx->header->clauses [i];
|
if (clause->flags != MONO_EXCEPTION_CLAUSE_FILTER)
|
continue;
|
if (MONO_OFFSET_IN_FILTER (clause, offset))
|
return clause;
|
if (!IS_STRICT_MODE (ctx) && MONO_OFFSET_IN_HANDLER (clause, offset))
|
return clause;
|
}
|
return NULL;
|
}
|
|
|
/*
|
* Non-strict endfilter can happens inside a try block or any handler block
|
*/
|
static int
|
is_unverifiable_endfilter (VerifyContext *ctx, guint offset)
|
{
|
int i;
|
MonoExceptionClause *clause;
|
|
for (i = 0; i < ctx->header->num_clauses; ++i) {
|
clause = &ctx->header->clauses [i];
|
if (MONO_OFFSET_IN_CLAUSE (clause, offset))
|
return 1;
|
}
|
return 0;
|
}
|
|
static gboolean
|
is_valid_bool_arg (ILStackDesc *arg)
|
{
|
if (stack_slot_is_managed_pointer (arg) || stack_slot_is_boxed_value (arg) || stack_slot_is_null_literal (arg))
|
return TRUE;
|
|
|
switch (stack_slot_get_underlying_type (arg)) {
|
case TYPE_I4:
|
case TYPE_I8:
|
case TYPE_NATIVE_INT:
|
case TYPE_PTR:
|
return TRUE;
|
case TYPE_COMPLEX:
|
g_assert (arg->type);
|
switch (arg->type->type) {
|
case MONO_TYPE_CLASS:
|
case MONO_TYPE_STRING:
|
case MONO_TYPE_OBJECT:
|
case MONO_TYPE_SZARRAY:
|
case MONO_TYPE_ARRAY:
|
case MONO_TYPE_FNPTR:
|
case MONO_TYPE_PTR:
|
return TRUE;
|
case MONO_TYPE_GENERICINST:
|
/*We need to check if the container class
|
* of the generic type is a valuetype, iow:
|
* is it a "class Foo<T>" or a "struct Foo<T>"?
|
*/
|
return !arg->type->data.generic_class->container_class->valuetype;
|
default:
|
return FALSE;
|
}
|
default:
|
return FALSE;
|
}
|
}
|
|
|
/*Type manipulation helper*/
|
|
/*Returns the byref version of the supplied MonoType*/
|
static MonoType*
|
mono_type_get_type_byref (MonoType *type)
|
{
|
if (type->byref)
|
return type;
|
return &mono_class_from_mono_type (type)->this_arg;
|
}
|
|
|
/*Returns the byval version of the supplied MonoType*/
|
static MonoType*
|
mono_type_get_type_byval (MonoType *type)
|
{
|
if (!type->byref)
|
return type;
|
return &mono_class_from_mono_type (type)->byval_arg;
|
}
|
|
static MonoType*
|
mono_type_from_stack_slot (ILStackDesc *slot)
|
{
|
if (stack_slot_is_managed_pointer (slot))
|
return mono_type_get_type_byref (slot->type);
|
return slot->type;
|
}
|
|
/*Stack manipulation code*/
|
|
static void
|
ensure_stack_size (ILCodeDesc *stack, int required)
|
{
|
int new_size = 8;
|
ILStackDesc *tmp;
|
|
if (required < stack->max_size)
|
return;
|
|
/* We don't have to worry about the exponential growth since stack_copy prune unused space */
|
new_size = MAX (8, MAX (required, stack->max_size * 2));
|
|
g_assert (new_size >= stack->size);
|
g_assert (new_size >= required);
|
|
tmp = g_new0 (ILStackDesc, new_size);
|
_MEM_ALLOC (sizeof (ILStackDesc) * new_size);
|
|
if (stack->stack) {
|
if (stack->size)
|
memcpy (tmp, stack->stack, stack->size * sizeof (ILStackDesc));
|
g_free (stack->stack);
|
_MEM_FREE (sizeof (ILStackDesc) * stack->max_size);
|
}
|
|
stack->stack = tmp;
|
stack->max_size = new_size;
|
}
|
|
static void
|
stack_init (VerifyContext *ctx, ILCodeDesc *state)
|
{
|
if (state->flags & IL_CODE_FLAG_STACK_INITED)
|
return;
|
state->size = state->max_size = 0;
|
state->flags |= IL_CODE_FLAG_STACK_INITED;
|
}
|
|
static void
|
stack_copy (ILCodeDesc *to, ILCodeDesc *from)
|
{
|
ensure_stack_size (to, from->size);
|
to->size = from->size;
|
|
/*stack copy happens at merge points, which have small stacks*/
|
if (from->size)
|
memcpy (to->stack, from->stack, sizeof (ILStackDesc) * from->size);
|
}
|
|
static void
|
copy_stack_value (ILStackDesc *to, ILStackDesc *from)
|
{
|
to->stype = from->stype;
|
to->type = from->type;
|
to->method = from->method;
|
}
|
|
static int
|
check_underflow (VerifyContext *ctx, int size)
|
{
|
if (ctx->eval.size < size) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack underflow, required %d, but have %d at 0x%04x", size, ctx->eval.size, ctx->ip_offset));
|
return 0;
|
}
|
return 1;
|
}
|
|
static int
|
check_overflow (VerifyContext *ctx)
|
{
|
if (ctx->eval.size >= ctx->max_stack) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have stack-depth %d at 0x%04x", ctx->eval.size + 1, ctx->ip_offset));
|
return 0;
|
}
|
return 1;
|
}
|
|
/*This reject out PTR, FNPTR and TYPEDBYREF*/
|
static gboolean
|
check_unmanaged_pointer (VerifyContext *ctx, ILStackDesc *value)
|
{
|
if (stack_slot_get_type (value) == TYPE_PTR) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
|
return 0;
|
}
|
return 1;
|
}
|
|
/*TODO verify if MONO_TYPE_TYPEDBYREF is not allowed here as well.*/
|
static gboolean
|
check_unverifiable_type (VerifyContext *ctx, MonoType *type)
|
{
|
if (type->type == MONO_TYPE_PTR || type->type == MONO_TYPE_FNPTR) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
|
return 0;
|
}
|
return 1;
|
}
|
|
static ILStackDesc *
|
stack_push (VerifyContext *ctx)
|
{
|
g_assert (ctx->eval.size < ctx->max_stack);
|
g_assert (ctx->eval.size <= ctx->eval.max_size);
|
|
ensure_stack_size (&ctx->eval, ctx->eval.size + 1);
|
|
return & ctx->eval.stack [ctx->eval.size++];
|
}
|
|
static ILStackDesc *
|
stack_push_val (VerifyContext *ctx, int stype, MonoType *type)
|
{
|
ILStackDesc *top = stack_push (ctx);
|
top->stype = stype;
|
top->type = type;
|
return top;
|
}
|
|
static ILStackDesc *
|
stack_pop (VerifyContext *ctx)
|
{
|
ILStackDesc *ret;
|
g_assert (ctx->eval.size > 0);
|
ret = ctx->eval.stack + --ctx->eval.size;
|
if ((ret->stype & UNINIT_THIS_MASK) == UNINIT_THIS_MASK)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Found use of uninitialized 'this ptr' ref at 0x%04x", ctx->ip_offset));
|
return ret;
|
}
|
|
/* This function allows to safely pop an unititialized this ptr from
|
* the eval stack without marking the method as unverifiable.
|
*/
|
static ILStackDesc *
|
stack_pop_safe (VerifyContext *ctx)
|
{
|
g_assert (ctx->eval.size > 0);
|
return ctx->eval.stack + --ctx->eval.size;
|
}
|
|
/*Positive number distance from stack top. [0] is stack top, [1] is the one below*/
|
static ILStackDesc*
|
stack_peek (VerifyContext *ctx, int distance)
|
{
|
g_assert (ctx->eval.size - distance > 0);
|
return ctx->eval.stack + (ctx->eval.size - 1 - distance);
|
}
|
|
static ILStackDesc *
|
stack_push_stack_val (VerifyContext *ctx, ILStackDesc *value)
|
{
|
ILStackDesc *top = stack_push (ctx);
|
copy_stack_value (top, value);
|
return top;
|
}
|
|
/* Returns the MonoType associated with the token, or NULL if it is invalid.
|
*
|
* A boxable type can be either a reference or value type, but cannot be a byref type or an unmanaged pointer
|
* */
|
static MonoType*
|
get_boxable_mono_type (VerifyContext* ctx, int token, const char *opcode)
|
{
|
MonoType *type;
|
MonoClass *klass;
|
|
if (!(type = verifier_load_type (ctx, token, opcode)))
|
return NULL;
|
|
if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type for %s at 0x%04x", opcode, ctx->ip_offset));
|
return NULL;
|
}
|
|
if (type->type == MONO_TYPE_VOID) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type for %s at 0x%04x", opcode, ctx->ip_offset));
|
return NULL;
|
}
|
|
if (type->type == MONO_TYPE_TYPEDBYREF)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid use of typedbyref for %s at 0x%04x", opcode, ctx->ip_offset));
|
|
if (!(klass = mono_class_from_mono_type (type)))
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not retrieve type token for %s at 0x%04x", opcode, ctx->ip_offset));
|
|
if (mono_class_is_gtd (klass) && type->type != MONO_TYPE_GENERICINST)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the generic type definition in a boxable type position for %s at 0x%04x", opcode, ctx->ip_offset));
|
|
check_unverifiable_type (ctx, type);
|
return type;
|
}
|
|
|
/*operation result tables */
|
|
static const unsigned char bin_op_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char add_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
|
{TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char sub_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
|
{TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char int_bin_op_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char shift_op_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_I8, TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char cmp_br_op [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char cmp_br_eq_op [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_I4, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4},
|
};
|
|
static const unsigned char add_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char sub_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
static const unsigned char bin_ovf_table [TYPE_MAX][TYPE_MAX] = {
|
{TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
{TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
|
};
|
|
#ifdef MONO_VERIFIER_DEBUG
|
|
/*debug helpers */
|
static void
|
dump_stack_value (ILStackDesc *value)
|
{
|
printf ("[(%x)(%x)", value->type->type, value->stype);
|
|
if (stack_slot_is_this_pointer (value))
|
printf ("[this] ");
|
|
if (stack_slot_is_boxed_value (value))
|
printf ("[boxed] ");
|
|
if (stack_slot_is_null_literal (value))
|
printf ("[null] ");
|
|
if (stack_slot_is_managed_mutability_pointer (value))
|
printf ("Controled Mutability MP: ");
|
|
if (stack_slot_is_managed_pointer (value))
|
printf ("Managed Pointer to: ");
|
|
if (stack_slot_is_safe_byref (value))
|
printf ("Safe ByRef to: ");
|
|
switch (stack_slot_get_underlying_type (value)) {
|
case TYPE_INV:
|
printf ("invalid type]");
|
return;
|
case TYPE_I4:
|
printf ("int32]");
|
return;
|
case TYPE_I8:
|
printf ("int64]");
|
return;
|
case TYPE_NATIVE_INT:
|
printf ("native int]");
|
return;
|
case TYPE_R8:
|
printf ("float64]");
|
return;
|
case TYPE_PTR:
|
printf ("unmanaged pointer]");
|
return;
|
case TYPE_COMPLEX:
|
switch (value->type->type) {
|
case MONO_TYPE_CLASS:
|
case MONO_TYPE_VALUETYPE:
|
printf ("complex] (%s)", value->type->data.klass->name);
|
return;
|
case MONO_TYPE_STRING:
|
printf ("complex] (string)");
|
return;
|
case MONO_TYPE_OBJECT:
|
printf ("complex] (object)");
|
return;
|
case MONO_TYPE_SZARRAY:
|
printf ("complex] (%s [])", value->type->data.klass->name);
|
return;
|
case MONO_TYPE_ARRAY:
|
printf ("complex] (%s [%d %d %d])",
|
value->type->data.array->eklass->name,
|
value->type->data.array->rank,
|
value->type->data.array->numsizes,
|
value->type->data.array->numlobounds);
|
return;
|
case MONO_TYPE_GENERICINST:
|
printf ("complex] (inst of %s )", value->type->data.generic_class->container_class->name);
|
return;
|
case MONO_TYPE_VAR:
|
printf ("complex] (type generic param !%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
|
return;
|
case MONO_TYPE_MVAR:
|
printf ("complex] (method generic param !!%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
|
return;
|
default: {
|
//should be a boxed value
|
char * name = mono_type_full_name (value->type);
|
printf ("complex] %s", name);
|
g_free (name);
|
return;
|
}
|
}
|
default:
|
printf ("unknown stack %x type]\n", value->stype);
|
g_assert_not_reached ();
|
}
|
}
|
|
static void
|
dump_stack_state (ILCodeDesc *state)
|
{
|
int i;
|
|
printf ("(%d) ", state->size);
|
for (i = 0; i < state->size; ++i)
|
dump_stack_value (state->stack + i);
|
printf ("\n");
|
}
|
#endif
|
|
/**
|
* is_array_type_compatible:
|
*
|
* Returns TRUE if candidate array type can be assigned to target.
|
*
|
* Both parameters MUST be of type MONO_TYPE_ARRAY (target->type == MONO_TYPE_ARRAY)
|
*/
|
static gboolean
|
is_array_type_compatible (MonoType *target, MonoType *candidate)
|
{
|
MonoArrayType *left = target->data.array;
|
MonoArrayType *right = candidate->data.array;
|
|
g_assert (target->type == MONO_TYPE_ARRAY);
|
g_assert (candidate->type == MONO_TYPE_ARRAY);
|
|
if (left->rank != right->rank)
|
return FALSE;
|
|
return verifier_class_is_assignable_from (left->eklass, right->eklass);
|
}
|
|
static int
|
get_stack_type (MonoType *type)
|
{
|
int mask = 0;
|
int type_kind = type->type;
|
if (type->byref)
|
mask = POINTER_MASK;
|
/*TODO handle CMMP_MASK */
|
|
handle_enum:
|
switch (type_kind) {
|
case MONO_TYPE_I1:
|
case MONO_TYPE_U1:
|
case MONO_TYPE_BOOLEAN:
|
case MONO_TYPE_I2:
|
case MONO_TYPE_U2:
|
case MONO_TYPE_CHAR:
|
case MONO_TYPE_I4:
|
case MONO_TYPE_U4:
|
return TYPE_I4 | mask;
|
|
case MONO_TYPE_I:
|
case MONO_TYPE_U:
|
return TYPE_NATIVE_INT | mask;
|
|
/* FIXME: the spec says that you cannot have a pointer to method pointer, do we need to check this here? */
|
case MONO_TYPE_FNPTR:
|
case MONO_TYPE_PTR:
|
case MONO_TYPE_TYPEDBYREF:
|
return TYPE_PTR | mask;
|
|
case MONO_TYPE_VAR:
|
case MONO_TYPE_MVAR:
|
|
case MONO_TYPE_CLASS:
|
case MONO_TYPE_STRING:
|
case MONO_TYPE_OBJECT:
|
case MONO_TYPE_SZARRAY:
|
case MONO_TYPE_ARRAY:
|
return TYPE_COMPLEX | mask;
|
|
case MONO_TYPE_I8:
|
case MONO_TYPE_U8:
|
return TYPE_I8 | mask;
|
|
case MONO_TYPE_R4:
|
case MONO_TYPE_R8:
|
return TYPE_R8 | mask;
|
|
case MONO_TYPE_GENERICINST:
|
case MONO_TYPE_VALUETYPE:
|
if (mono_type_is_enum_type (type)) {
|
type = mono_type_get_underlying_type_any (type);
|
if (!type)
|
return FALSE;
|
type_kind = type->type;
|
goto handle_enum;
|
} else {
|
return TYPE_COMPLEX | mask;
|
}
|
|
default:
|
return TYPE_INV;
|
}
|
}
|
|
/* convert MonoType to ILStackDesc format (stype) */
|
static gboolean
|
set_stack_value (VerifyContext *ctx, ILStackDesc *stack, MonoType *type, int take_addr)
|
{
|
int mask = 0;
|
int type_kind = type->type;
|
|
if (type->byref || take_addr)
|
mask = POINTER_MASK;
|
/* TODO handle CMMP_MASK */
|
|
handle_enum:
|
stack->type = type;
|
|
switch (type_kind) {
|
case MONO_TYPE_I1:
|
case MONO_TYPE_U1:
|
case MONO_TYPE_BOOLEAN:
|
case MONO_TYPE_I2:
|
case MONO_TYPE_U2:
|
case MONO_TYPE_CHAR:
|
case MONO_TYPE_I4:
|
case MONO_TYPE_U4:
|
stack->stype = TYPE_I4 | mask;
|
break;
|
case MONO_TYPE_I:
|
case MONO_TYPE_U:
|
stack->stype = TYPE_NATIVE_INT | mask;
|
break;
|
|
/*FIXME: Do we need to check if it's a pointer to the method pointer? The spec says it' illegal to have that.*/
|
case MONO_TYPE_FNPTR:
|
case MONO_TYPE_PTR:
|
case MONO_TYPE_TYPEDBYREF:
|
stack->stype = TYPE_PTR | mask;
|
break;
|
|
case MONO_TYPE_CLASS:
|
case MONO_TYPE_STRING:
|
case MONO_TYPE_OBJECT:
|
case MONO_TYPE_SZARRAY:
|
case MONO_TYPE_ARRAY:
|
|
case MONO_TYPE_VAR:
|
case MONO_TYPE_MVAR:
|
stack->stype = TYPE_COMPLEX | mask;
|
break;
|
|
case MONO_TYPE_I8:
|
case MONO_TYPE_U8:
|
stack->stype = TYPE_I8 | mask;
|
break;
|
case MONO_TYPE_R4:
|
case MONO_TYPE_R8:
|
stack->stype = TYPE_R8 | mask;
|
break;
|
case MONO_TYPE_GENERICINST:
|
case MONO_TYPE_VALUETYPE:
|
if (mono_type_is_enum_type (type)) {
|
MonoType *utype = mono_type_get_underlying_type_any (type);
|
if (!utype) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve underlying type of %x at %d", type->type, ctx->ip_offset));
|
return FALSE;
|
}
|
type = utype;
|
type_kind = type->type;
|
goto handle_enum;
|
} else {
|
stack->stype = TYPE_COMPLEX | mask;
|
break;
|
}
|
default:
|
VERIFIER_DEBUG ( printf ("unknown type 0x%02x in eval stack type\n", type->type); );
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Illegal value set on stack 0x%02x at %d", type->type, ctx->ip_offset));
|
return FALSE;
|
}
|
return TRUE;
|
}
|
|
/*
|
* init_stack_with_value_at_exception_boundary:
|
*
|
* Initialize the stack and push a given type.
|
* The instruction is marked as been on the exception boundary.
|
*/
|
static void
|
init_stack_with_value_at_exception_boundary (VerifyContext *ctx, ILCodeDesc *code, MonoClass *klass)
|
{
|
MonoError error;
|
MonoType *type = mono_class_inflate_generic_type_checked (&klass->byval_arg, ctx->generic_context, &error);
|
|
if (!mono_error_ok (&error)) {
|
char *name = mono_type_get_full_name (klass);
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid class %s used for exception", name));
|
g_free (name);
|
mono_error_cleanup (&error);
|
return;
|
}
|
|
if (!ctx->max_stack) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack overflow at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
stack_init (ctx, code);
|
ensure_stack_size (code, 1);
|
set_stack_value (ctx, code->stack, type, FALSE);
|
ctx->exception_types = g_slist_prepend (ctx->exception_types, type);
|
code->size = 1;
|
code->flags |= IL_CODE_FLAG_WAS_TARGET;
|
if (mono_type_is_generic_argument (type))
|
code->stack->stype |= BOXED_MASK;
|
}
|
/* Class lazy loading functions */
|
static GENERATE_GET_CLASS_WITH_CACHE (ienumerable, "System.Collections.Generic", "IEnumerable`1")
|
static GENERATE_GET_CLASS_WITH_CACHE (icollection, "System.Collections.Generic", "ICollection`1")
|
static GENERATE_GET_CLASS_WITH_CACHE (ireadonly_list, "System.Collections.Generic", "IReadOnlyList`1")
|
static GENERATE_GET_CLASS_WITH_CACHE (ireadonly_collection, "System.Collections.Generic", "IReadOnlyCollection`1")
|
|
|
static MonoClass*
|
get_ienumerable_class (void)
|
{
|
return mono_class_get_ienumerable_class ();
|
}
|
|
static MonoClass*
|
get_icollection_class (void)
|
{
|
return mono_class_get_icollection_class ();
|
}
|
|
static MonoClass*
|
get_ireadonlylist_class (void)
|
{
|
return mono_class_get_ireadonly_list_class ();
|
}
|
|
static MonoClass*
|
get_ireadonlycollection_class (void)
|
{
|
return mono_class_get_ireadonly_collection_class ();
|
}
|
|
static MonoClass*
|
inflate_class_one_arg (MonoClass *gtype, MonoClass *arg0)
|
{
|
MonoType *args [1];
|
args [0] = &arg0->byval_arg;
|
|
return mono_class_bind_generic_parameters (gtype, 1, args, FALSE);
|
}
|
|
static gboolean
|
verifier_inflate_and_check_compat (MonoClass *target, MonoClass *gtd, MonoClass *arg)
|
{
|
MonoClass *tmp;
|
if (!(tmp = inflate_class_one_arg (gtd, arg)))
|
return FALSE;
|
if (mono_class_is_variant_compatible (target, tmp, TRUE))
|
return TRUE;
|
return FALSE;
|
}
|
|
static gboolean
|
verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate)
|
{
|
MonoClass *iface_gtd;
|
|
if (target == candidate)
|
return TRUE;
|
|
if (mono_class_has_variant_generic_params (target)) {
|
if (MONO_CLASS_IS_INTERFACE (target)) {
|
if (MONO_CLASS_IS_INTERFACE (candidate) && mono_class_is_variant_compatible (target, candidate, TRUE))
|
return TRUE;
|
|
if (candidate->rank == 1) {
|
if (verifier_inflate_and_check_compat (target, mono_defaults.generic_ilist_class, candidate->element_class))
|
return TRUE;
|
if (verifier_inflate_and_check_compat (target, get_icollection_class (), candidate->element_class))
|
return TRUE;
|
if (verifier_inflate_and_check_compat (target, get_ienumerable_class (), candidate->element_class))
|
return TRUE;
|
if (verifier_inflate_and_check_compat (target, get_ireadonlylist_class (), candidate->element_class))
|
return TRUE;
|
if (verifier_inflate_and_check_compat (target, get_ireadonlycollection_class (), candidate->element_class))
|
return TRUE;
|
} else {
|
MonoError error;
|
int i;
|
while (candidate && candidate != mono_defaults.object_class) {
|
mono_class_setup_interfaces (candidate, &error);
|
if (!mono_error_ok (&error)) {
|
mono_error_cleanup (&error);
|
return FALSE;
|
}
|
|
/*klass is a generic variant interface, We need to extract from oklass a list of ifaces which are viable candidates.*/
|
for (i = 0; i < candidate->interface_offsets_count; ++i) {
|
MonoClass *iface = candidate->interfaces_packed [i];
|
if (mono_class_is_variant_compatible (target, iface, TRUE))
|
return TRUE;
|
}
|
|
for (i = 0; i < candidate->interface_count; ++i) {
|
MonoClass *iface = candidate->interfaces [i];
|
if (mono_class_is_variant_compatible (target, iface, TRUE))
|
return TRUE;
|
}
|
candidate = candidate->parent;
|
}
|
}
|
} else if (target->delegate) {
|
if (mono_class_is_variant_compatible (target, candidate, TRUE))
|
return TRUE;
|
}
|
return FALSE;
|
}
|
|
if (mono_class_is_assignable_from (target, candidate))
|
return TRUE;
|
|
if (!MONO_CLASS_IS_INTERFACE (target) || !mono_class_is_ginst (target) || candidate->rank != 1)
|
return FALSE;
|
|
iface_gtd = mono_class_get_generic_class (target)->container_class;
|
if (iface_gtd != mono_defaults.generic_ilist_class && iface_gtd != get_icollection_class () && iface_gtd != get_ienumerable_class ())
|
return FALSE;
|
|
target = mono_class_from_mono_type (mono_class_get_generic_class (target)->context.class_inst->type_argv [0]);
|
candidate = candidate->element_class;
|
|
return TRUE;
|
}
|
|
/*Verify if type 'candidate' can be stored in type 'target'.
|
*
|
* If strict, check for the underlying type and not the verification stack types
|
*/
|
static gboolean
|
verify_type_compatibility_full (VerifyContext *ctx, MonoType *target, MonoType *candidate, gboolean strict)
|
{
|
#define IS_ONE_OF3(T, A, B, C) (T == A || T == B || T == C)
|
#define IS_ONE_OF2(T, A, B) (T == A || T == B)
|
|
MonoType *original_candidate = candidate;
|
VERIFIER_DEBUG ( printf ("checking type compatibility %s x %s strict %d\n", mono_type_full_name (target), mono_type_full_name (candidate), strict); );
|
|
/*only one is byref */
|
if (candidate->byref ^ target->byref) {
|
/* converting from native int to byref*/
|
if (get_stack_type (candidate) == TYPE_NATIVE_INT && target->byref) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("using byref native int at 0x%04x", ctx->ip_offset));
|
return TRUE;
|
}
|
return FALSE;
|
}
|
strict |= target->byref;
|
/*From now on we don't care about byref anymore, so it's ok to discard it here*/
|
candidate = mono_type_get_underlying_type_any (candidate);
|
|
handle_enum:
|
switch (target->type) {
|
case MONO_TYPE_VOID:
|
return candidate->type == MONO_TYPE_VOID;
|
case MONO_TYPE_I1:
|
case MONO_TYPE_U1:
|
case MONO_TYPE_BOOLEAN:
|
if (strict)
|
return IS_ONE_OF3 (candidate->type, MONO_TYPE_I1, MONO_TYPE_U1, MONO_TYPE_BOOLEAN);
|
case MONO_TYPE_I2:
|
case MONO_TYPE_U2:
|
case MONO_TYPE_CHAR:
|
if (strict)
|
return IS_ONE_OF3 (candidate->type, MONO_TYPE_I2, MONO_TYPE_U2, MONO_TYPE_CHAR);
|
case MONO_TYPE_I4:
|
case MONO_TYPE_U4: {
|
gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
|
gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
|
if (strict)
|
return is_native_int || is_int4;
|
return is_native_int || get_stack_type (candidate) == TYPE_I4;
|
}
|
|
case MONO_TYPE_I8:
|
case MONO_TYPE_U8:
|
return IS_ONE_OF2 (candidate->type, MONO_TYPE_I8, MONO_TYPE_U8);
|
|
case MONO_TYPE_R4:
|
case MONO_TYPE_R8:
|
if (strict)
|
return candidate->type == target->type;
|
return IS_ONE_OF2 (candidate->type, MONO_TYPE_R4, MONO_TYPE_R8);
|
|
case MONO_TYPE_I:
|
case MONO_TYPE_U: {
|
gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
|
gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
|
if (strict)
|
return is_native_int || is_int4;
|
return is_native_int || get_stack_type (candidate) == TYPE_I4;
|
}
|
|
case MONO_TYPE_PTR:
|
if (candidate->type != MONO_TYPE_PTR)
|
return FALSE;
|
/* check the underlying type */
|
return verify_type_compatibility_full (ctx, target->data.type, candidate->data.type, TRUE);
|
|
case MONO_TYPE_FNPTR: {
|
MonoMethodSignature *left, *right;
|
if (candidate->type != MONO_TYPE_FNPTR)
|
return FALSE;
|
|
left = mono_type_get_signature (target);
|
right = mono_type_get_signature (candidate);
|
return mono_metadata_signature_equal (left, right) && left->call_convention == right->call_convention;
|
}
|
|
case MONO_TYPE_GENERICINST: {
|
MonoClass *target_klass;
|
MonoClass *candidate_klass;
|
if (mono_type_is_enum_type (target)) {
|
target = mono_type_get_underlying_type_any (target);
|
if (!target)
|
return FALSE;
|
goto handle_enum;
|
}
|
/*
|
* VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
|
* to take boxing status into account.
|
*/
|
if (mono_type_is_generic_argument (original_candidate))
|
return FALSE;
|
|
target_klass = mono_class_from_mono_type (target);
|
candidate_klass = mono_class_from_mono_type (candidate);
|
if (mono_class_is_nullable (target_klass)) {
|
if (!mono_class_is_nullable (candidate_klass))
|
return FALSE;
|
return target_klass == candidate_klass;
|
}
|
return verifier_class_is_assignable_from (target_klass, candidate_klass);
|
}
|
|
case MONO_TYPE_STRING:
|
return candidate->type == MONO_TYPE_STRING;
|
|
case MONO_TYPE_CLASS:
|
/*
|
* VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
|
* to take boxing status into account.
|
*/
|
if (mono_type_is_generic_argument (original_candidate))
|
return FALSE;
|
|
if (candidate->type == MONO_TYPE_VALUETYPE)
|
return FALSE;
|
|
/* If candidate is an enum it should return true for System.Enum and supertypes.
|
* That's why here we use the original type and not the underlying type.
|
*/
|
return verifier_class_is_assignable_from (target->data.klass, mono_class_from_mono_type (original_candidate));
|
|
case MONO_TYPE_OBJECT:
|
return MONO_TYPE_IS_REFERENCE (candidate);
|
|
case MONO_TYPE_SZARRAY: {
|
MonoClass *left;
|
MonoClass *right;
|
if (candidate->type != MONO_TYPE_SZARRAY)
|
return FALSE;
|
|
left = mono_class_from_mono_type (target);
|
right = mono_class_from_mono_type (candidate);
|
|
return verifier_class_is_assignable_from (left, right);
|
}
|
|
case MONO_TYPE_ARRAY:
|
if (candidate->type != MONO_TYPE_ARRAY)
|
return FALSE;
|
return is_array_type_compatible (target, candidate);
|
|
case MONO_TYPE_TYPEDBYREF:
|
return candidate->type == MONO_TYPE_TYPEDBYREF;
|
|
case MONO_TYPE_VALUETYPE: {
|
MonoClass *target_klass;
|
MonoClass *candidate_klass;
|
|
if (candidate->type == MONO_TYPE_CLASS)
|
return FALSE;
|
|
target_klass = mono_class_from_mono_type (target);
|
candidate_klass = mono_class_from_mono_type (candidate);
|
if (target_klass == candidate_klass)
|
return TRUE;
|
if (mono_type_is_enum_type (target)) {
|
target = mono_type_get_underlying_type_any (target);
|
if (!target)
|
return FALSE;
|
goto handle_enum;
|
}
|
return FALSE;
|
}
|
|
case MONO_TYPE_VAR:
|
if (candidate->type != MONO_TYPE_VAR)
|
return FALSE;
|
return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
|
|
case MONO_TYPE_MVAR:
|
if (candidate->type != MONO_TYPE_MVAR)
|
return FALSE;
|
return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
|
|
default:
|
VERIFIER_DEBUG ( printf ("unknown store type %d\n", target->type); );
|
g_assert_not_reached ();
|
return FALSE;
|
}
|
return 1;
|
#undef IS_ONE_OF3
|
#undef IS_ONE_OF2
|
}
|
|
static gboolean
|
verify_type_compatibility (VerifyContext *ctx, MonoType *target, MonoType *candidate)
|
{
|
return verify_type_compatibility_full (ctx, target, candidate, FALSE);
|
}
|
|
/*
|
* Returns the generic param bound to the context been verified.
|
*
|
*/
|
static MonoGenericParam*
|
get_generic_param (VerifyContext *ctx, MonoType *param)
|
{
|
guint16 param_num = mono_type_get_generic_param_num (param);
|
if (param->type == MONO_TYPE_VAR) {
|
if (!ctx->generic_context->class_inst || ctx->generic_context->class_inst->type_argc <= param_num) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic type argument %d", param_num));
|
return NULL;
|
}
|
return ctx->generic_context->class_inst->type_argv [param_num]->data.generic_param;
|
}
|
|
/*param must be a MVAR */
|
if (!ctx->generic_context->method_inst || ctx->generic_context->method_inst->type_argc <= param_num) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic method argument %d", param_num));
|
return NULL;
|
}
|
return ctx->generic_context->method_inst->type_argv [param_num]->data.generic_param;
|
|
}
|
|
static gboolean
|
recursive_boxed_constraint_type_check (VerifyContext *ctx, MonoType *type, MonoClass *constraint_class, int recursion_level)
|
{
|
MonoType *constraint_type = &constraint_class->byval_arg;
|
if (recursion_level <= 0)
|
return FALSE;
|
|
if (verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (constraint_type), FALSE))
|
return TRUE;
|
|
if (mono_type_is_generic_argument (constraint_type)) {
|
MonoGenericParam *param = get_generic_param (ctx, constraint_type);
|
MonoClass **klass;
|
if (!param)
|
return FALSE;
|
for (klass = mono_generic_param_info (param)->constraints; klass && *klass; ++klass) {
|
if (recursive_boxed_constraint_type_check (ctx, type, *klass, recursion_level - 1))
|
return TRUE;
|
}
|
}
|
return FALSE;
|
}
|
|
/**
|
* is_compatible_boxed_valuetype:
|
*
|
* Returns: TRUE if @candidate / @stack is a valid boxed valuetype.
|
*
|
* @type The source type. It it tested to be of the proper type.
|
* @candidate type of the boxed valuetype.
|
* @stack stack slot of the boxed valuetype, separate from @candidade since one could be changed before calling this function
|
* @strict if TRUE candidate must be boxed compatible to the target type
|
*
|
*/
|
static gboolean
|
is_compatible_boxed_valuetype (VerifyContext *ctx, MonoType *type, MonoType *candidate, ILStackDesc *stack, gboolean strict)
|
{
|
if (!stack_slot_is_boxed_value (stack))
|
return FALSE;
|
if (type->byref || candidate->byref)
|
return FALSE;
|
|
if (mono_type_is_generic_argument (candidate)) {
|
MonoGenericParam *param = get_generic_param (ctx, candidate);
|
MonoClass **klass;
|
if (!param)
|
return FALSE;
|
|
for (klass = mono_generic_param_info (param)->constraints; klass && *klass; ++klass) {
|
/*256 should be enough since there can't be more than 255 generic arguments.*/
|
if (recursive_boxed_constraint_type_check (ctx, type, *klass, 256))
|
return TRUE;
|
}
|
}
|
|
if (mono_type_is_generic_argument (type))
|
return FALSE;
|
|
if (!strict)
|
return TRUE;
|
|
return MONO_TYPE_IS_REFERENCE (type) && verifier_class_is_assignable_from (mono_class_from_mono_type (type), mono_class_from_mono_type (candidate));
|
}
|
|
static int
|
verify_stack_type_compatibility_full (VerifyContext *ctx, MonoType *type, ILStackDesc *stack, gboolean drop_byref, gboolean valuetype_must_be_boxed)
|
{
|
MonoType *candidate = mono_type_from_stack_slot (stack);
|
if (MONO_TYPE_IS_REFERENCE (type) && !type->byref && stack_slot_is_null_literal (stack))
|
return TRUE;
|
|
if (is_compatible_boxed_valuetype (ctx, type, candidate, stack, TRUE))
|
return TRUE;
|
|
if (valuetype_must_be_boxed && !stack_slot_is_boxed_value (stack) && !MONO_TYPE_IS_REFERENCE (candidate))
|
return FALSE;
|
|
if (!valuetype_must_be_boxed && stack_slot_is_boxed_value (stack))
|
return FALSE;
|
|
if (drop_byref)
|
return verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (candidate), FALSE);
|
|
/* Handle how Roslyn emit fixed statements by encoding it as byref */
|
if (type->byref && candidate->byref && (type->type == MONO_TYPE_I) && !mono_type_is_reference (candidate)) {
|
if (!IS_STRICT_MODE (ctx))
|
return TRUE;
|
}
|
|
return verify_type_compatibility_full (ctx, type, candidate, FALSE);
|
}
|
|
static int
|
verify_stack_type_compatibility (VerifyContext *ctx, MonoType *type, ILStackDesc *stack)
|
{
|
return verify_stack_type_compatibility_full (ctx, type, stack, FALSE, FALSE);
|
}
|
|
static gboolean
|
mono_delegate_type_equal (MonoType *target, MonoType *candidate)
|
{
|
if (candidate->byref ^ target->byref)
|
return FALSE;
|
|
switch (target->type) {
|
case MONO_TYPE_VOID:
|
case MONO_TYPE_I1:
|
case MONO_TYPE_U1:
|
case MONO_TYPE_BOOLEAN:
|
case MONO_TYPE_I2:
|
case MONO_TYPE_U2:
|
case MONO_TYPE_CHAR:
|
case MONO_TYPE_I4:
|
case MONO_TYPE_U4:
|
case MONO_TYPE_I8:
|
case MONO_TYPE_U8:
|
case MONO_TYPE_R4:
|
case MONO_TYPE_R8:
|
case MONO_TYPE_I:
|
case MONO_TYPE_U:
|
case MONO_TYPE_STRING:
|
case MONO_TYPE_TYPEDBYREF:
|
return candidate->type == target->type;
|
|
case MONO_TYPE_PTR:
|
if (candidate->type != MONO_TYPE_PTR)
|
return FALSE;
|
return mono_delegate_type_equal (target->data.type, candidate->data.type);
|
|
case MONO_TYPE_FNPTR:
|
if (candidate->type != MONO_TYPE_FNPTR)
|
return FALSE;
|
return mono_delegate_signature_equal (mono_type_get_signature (target), mono_type_get_signature (candidate), FALSE);
|
|
case MONO_TYPE_GENERICINST: {
|
MonoClass *target_klass;
|
MonoClass *candidate_klass;
|
target_klass = mono_class_from_mono_type (target);
|
candidate_klass = mono_class_from_mono_type (candidate);
|
/*FIXME handle nullables and enum*/
|
return verifier_class_is_assignable_from (target_klass, candidate_klass);
|
}
|
case MONO_TYPE_OBJECT:
|
return MONO_TYPE_IS_REFERENCE (candidate);
|
|
case MONO_TYPE_CLASS:
|
return verifier_class_is_assignable_from(target->data.klass, mono_class_from_mono_type (candidate));
|
|
case MONO_TYPE_SZARRAY:
|
if (candidate->type != MONO_TYPE_SZARRAY)
|
return FALSE;
|
return verifier_class_is_assignable_from (mono_class_from_mono_type (target)->element_class, mono_class_from_mono_type (candidate)->element_class);
|
|
case MONO_TYPE_ARRAY:
|
if (candidate->type != MONO_TYPE_ARRAY)
|
return FALSE;
|
return is_array_type_compatible (target, candidate);
|
|
case MONO_TYPE_VALUETYPE:
|
/*FIXME handle nullables and enum*/
|
return mono_class_from_mono_type (candidate) == mono_class_from_mono_type (target);
|
|
case MONO_TYPE_VAR:
|
return candidate->type == MONO_TYPE_VAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
|
return FALSE;
|
|
case MONO_TYPE_MVAR:
|
return candidate->type == MONO_TYPE_MVAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
|
return FALSE;
|
|
default:
|
VERIFIER_DEBUG ( printf ("Unknown type %d. Implement me!\n", target->type); );
|
g_assert_not_reached ();
|
return FALSE;
|
}
|
}
|
|
static gboolean
|
mono_delegate_param_equal (MonoType *delegate, MonoType *method)
|
{
|
if (mono_metadata_type_equal_full (delegate, method, TRUE))
|
return TRUE;
|
|
return mono_delegate_type_equal (method, delegate);
|
}
|
|
static gboolean
|
mono_delegate_ret_equal (MonoType *delegate, MonoType *method)
|
{
|
if (mono_metadata_type_equal_full (delegate, method, TRUE))
|
return TRUE;
|
|
return mono_delegate_type_equal (delegate, method);
|
}
|
|
/*
|
* mono_delegate_signature_equal:
|
*
|
* Compare two signatures in the way expected by delegates.
|
*
|
* This function only exists due to the fact that it should ignore the 'has_this' part of the signature.
|
*
|
* FIXME can this function be eliminated and proper metadata functionality be used?
|
*/
|
static gboolean
|
mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn)
|
{
|
int i;
|
int method_offset = is_static_ldftn ? 1 : 0;
|
|
if (delegate_sig->param_count + method_offset != method_sig->param_count)
|
return FALSE;
|
|
if (delegate_sig->call_convention != method_sig->call_convention)
|
return FALSE;
|
|
for (i = 0; i < delegate_sig->param_count; i++) {
|
MonoType *p1 = delegate_sig->params [i];
|
MonoType *p2 = method_sig->params [i + method_offset];
|
|
if (!mono_delegate_param_equal (p1, p2))
|
return FALSE;
|
}
|
|
if (!mono_delegate_ret_equal (delegate_sig->ret, method_sig->ret))
|
return FALSE;
|
|
return TRUE;
|
}
|
|
gboolean
|
mono_verifier_is_signature_compatible (MonoMethodSignature *target, MonoMethodSignature *candidate)
|
{
|
return mono_delegate_signature_equal (target, candidate, FALSE);
|
}
|
|
/*
|
* verify_ldftn_delegate:
|
*
|
* Verify properties of ldftn based delegates.
|
*/
|
static void
|
verify_ldftn_delegate (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
|
{
|
MonoMethod *method = funptr->method;
|
|
/*ldftn non-final virtuals only allowed if method is not static,
|
* the object is a this arg (comes from a ldarg.0), and there is no starg.0.
|
* This rules doesn't apply if the object on stack is a boxed valuetype.
|
*/
|
if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !mono_class_is_sealed (method->klass) && !stack_slot_is_boxed_value (value)) {
|
/*A stdarg 0 must not happen, we fail here only in fail fast mode to avoid double error reports*/
|
if (IS_FAIL_FAST_MODE (ctx) && ctx->has_this_store)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", ctx->ip_offset));
|
|
/*current method must not be static*/
|
if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function at 0x%04x", ctx->ip_offset));
|
|
/*value is the this pointer, loaded using ldarg.0 */
|
if (!stack_slot_is_this_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object argument, it is not the this pointer, to ldftn with virtual method at 0x%04x", ctx->ip_offset));
|
|
ctx->code [ctx->ip_offset].flags |= IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL;
|
}
|
}
|
|
/*
|
* verify_delegate_compatibility:
|
*
|
* Verify delegate creation sequence.
|
*
|
*/
|
static void
|
verify_delegate_compatibility (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
|
{
|
#define IS_VALID_OPCODE(offset, opcode) (ip [ip_offset - offset] == opcode && (ctx->code [ip_offset - offset].flags & IL_CODE_FLAG_SEEN))
|
#define IS_LOAD_FUN_PTR(kind) (IS_VALID_OPCODE (6, CEE_PREFIX1) && ip [ip_offset - 5] == kind)
|
|
MonoMethod *invoke, *method;
|
const guint8 *ip = ctx->header->code;
|
guint32 ip_offset = ctx->ip_offset;
|
gboolean is_static_ldftn = FALSE, is_first_arg_bound = FALSE;
|
|
if (stack_slot_get_type (funptr) != TYPE_PTR || !funptr->method) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid function pointer parameter for delegate constructor at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
invoke = mono_get_delegate_invoke (delegate);
|
method = funptr->method;
|
|
if (!method || !mono_method_signature (method)) {
|
char *name = mono_type_get_full_name (delegate);
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid method on stack to create delegate %s construction at 0x%04x", name, ctx->ip_offset));
|
g_free (name);
|
return;
|
}
|
|
if (!invoke || !mono_method_signature (invoke)) {
|
char *name = mono_type_get_full_name (delegate);
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Delegate type %s with bad Invoke method at 0x%04x", name, ctx->ip_offset));
|
g_free (name);
|
return;
|
}
|
|
is_static_ldftn = (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) && method->flags & METHOD_ATTRIBUTE_STATIC;
|
|
if (is_static_ldftn)
|
is_first_arg_bound = mono_method_signature (invoke)->param_count + 1 == mono_method_signature (method)->param_count;
|
|
if (!mono_delegate_signature_equal (mono_method_signature (invoke), mono_method_signature (method), is_first_arg_bound)) {
|
char *fun_sig = mono_signature_get_desc (mono_method_signature (method), FALSE);
|
char *invoke_sig = mono_signature_get_desc (mono_method_signature (invoke), FALSE);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Function pointer signature '%s' doesn't match delegate's signature '%s' at 0x%04x", fun_sig, invoke_sig, ctx->ip_offset));
|
g_free (fun_sig);
|
g_free (invoke_sig);
|
}
|
|
/*
|
* Delegate code sequences:
|
* [-6] ldftn token
|
* newobj ...
|
*
|
*
|
* [-7] dup
|
* [-6] ldvirtftn token
|
* newobj ...
|
*
|
* ldftn sequence:*/
|
if (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) {
|
verify_ldftn_delegate (ctx, delegate, value, funptr);
|
} else if (ip_offset > 6 && IS_VALID_OPCODE (7, CEE_DUP) && IS_LOAD_FUN_PTR (CEE_LDVIRTFTN)) {
|
ctx->code [ip_offset - 6].flags |= IL_CODE_DELEGATE_SEQUENCE;
|
}else {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid code sequence for delegate creation at 0x%04x", ctx->ip_offset));
|
}
|
ctx->code [ip_offset].flags |= IL_CODE_DELEGATE_SEQUENCE;
|
|
//general tests
|
if (is_first_arg_bound) {
|
if (mono_method_signature (method)->param_count == 0 || !verify_stack_type_compatibility_full (ctx, mono_method_signature (method)->params [0], value, FALSE, TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
|
} else {
|
if (method->flags & METHOD_ATTRIBUTE_STATIC) {
|
if (!stack_slot_is_null_literal (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Non-null this args used with static function for delegate creation at 0x%04x", ctx->ip_offset));
|
} else {
|
if (!verify_stack_type_compatibility_full (ctx, &method->klass->byval_arg, value, FALSE, TRUE) && !stack_slot_is_null_literal (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
|
}
|
}
|
|
if (stack_slot_get_type (value) != TYPE_COMPLEX)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid first parameter for delegate creation at 0x%04x", ctx->ip_offset));
|
|
#undef IS_VALID_OPCODE
|
#undef IS_LOAD_FUN_PTR
|
}
|
|
static gboolean
|
is_this_arg_of_struct_instance_method (unsigned int arg, VerifyContext *ctx)
|
{
|
if (arg != 0)
|
return FALSE;
|
if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
|
return FALSE;
|
if (!ctx->method->klass->valuetype)
|
return FALSE;
|
return TRUE;
|
}
|
|
/* implement the opcode checks*/
|
static void
|
push_arg (VerifyContext *ctx, unsigned int arg, int take_addr)
|
{
|
ILStackDesc *top;
|
|
if (arg >= ctx->max_args) {
|
if (take_addr)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
|
else {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
|
if (check_overflow (ctx)) //FIXME: what sane value could we ever push?
|
stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
}
|
} else if (check_overflow (ctx)) {
|
/*We must let the value be pushed, otherwise we would get an underflow error*/
|
check_unverifiable_type (ctx, ctx->params [arg]);
|
if (ctx->params [arg]->byref && take_addr)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
|
top = stack_push (ctx);
|
if (!set_stack_value (ctx, top, ctx->params [arg], take_addr))
|
return;
|
|
if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC)) {
|
if (take_addr)
|
ctx->has_this_store = TRUE;
|
else
|
top->stype |= THIS_POINTER_MASK;
|
if (mono_method_is_constructor (ctx->method) && !ctx->super_ctor_called && !ctx->method->klass->valuetype)
|
top->stype |= UNINIT_THIS_MASK;
|
}
|
if (!take_addr && ctx->params [arg]->byref && !is_this_arg_of_struct_instance_method (arg, ctx))
|
top->stype |= SAFE_BYREF_MASK;
|
}
|
}
|
|
static void
|
push_local (VerifyContext *ctx, guint32 arg, int take_addr)
|
{
|
if (arg >= ctx->num_locals) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local %d", arg + 1));
|
} else if (check_overflow (ctx)) {
|
/*We must let the value be pushed, otherwise we would get an underflow error*/
|
check_unverifiable_type (ctx, ctx->locals [arg]);
|
if (ctx->locals [arg]->byref && take_addr)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
|
|
ILStackDesc *value = stack_push (ctx);
|
set_stack_value (ctx, value, ctx->locals [arg], take_addr);
|
if (local_is_safe_byref (ctx, arg))
|
value->stype |= SAFE_BYREF_MASK;
|
}
|
}
|
|
static void
|
store_arg (VerifyContext *ctx, guint32 arg)
|
{
|
ILStackDesc *value;
|
|
if (arg >= ctx->max_args) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d at 0x%04x", arg + 1, ctx->ip_offset));
|
if (check_underflow (ctx, 1))
|
stack_pop (ctx);
|
return;
|
}
|
|
if (check_underflow (ctx, 1)) {
|
value = stack_pop (ctx);
|
if (!verify_stack_type_compatibility (ctx, ctx->params [arg], value)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in argument store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
}
|
}
|
if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC))
|
ctx->has_this_store = 1;
|
}
|
|
static void
|
store_local (VerifyContext *ctx, guint32 arg)
|
{
|
ILStackDesc *value;
|
if (arg >= ctx->num_locals) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local var %d at 0x%04x", arg + 1, ctx->ip_offset));
|
return;
|
}
|
|
/*TODO verify definite assigment */
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
if (ctx->locals [arg]->byref) {
|
if (stack_slot_is_managed_mutability_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly managed reference when storing on a local variable at 0x%04x", ctx->ip_offset));
|
|
if (local_is_safe_byref (ctx, arg) && !stack_slot_is_safe_byref (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot store an unsafe ret byref to a local that was previously stored a save ret byref value at 0x%04x", ctx->ip_offset));
|
|
if (stack_slot_is_safe_byref (value) && !local_is_unsafe_byref (ctx, arg))
|
ctx->locals_verification_state [arg] |= SAFE_BYREF_LOCAL;
|
|
if (!stack_slot_is_safe_byref (value))
|
ctx->locals_verification_state [arg] |= UNSAFE_BYREF_LOCAL;
|
|
}
|
if (!verify_stack_type_compatibility (ctx, ctx->locals [arg], value)) {
|
char *expected = mono_type_full_name (ctx->locals [arg]);
|
char *found = stack_slot_full_name (value);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type '%s' on stack cannot be stored to local %d with type '%s' at 0x%04x",
|
found,
|
arg,
|
expected,
|
ctx->ip_offset));
|
g_free (expected);
|
g_free (found);
|
}
|
}
|
|
/*FIXME add and sub needs special care here*/
|
static void
|
do_binop (VerifyContext *ctx, unsigned int opcode, const unsigned char table [TYPE_MAX][TYPE_MAX])
|
{
|
ILStackDesc *a, *b, *top;
|
int idxa, idxb, complexMerge = 0;
|
unsigned char res;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
b = stack_pop (ctx);
|
a = stack_pop (ctx);
|
|
idxa = stack_slot_get_underlying_type (a);
|
if (stack_slot_is_managed_pointer (a)) {
|
idxa = TYPE_PTR;
|
complexMerge = 1;
|
}
|
|
idxb = stack_slot_get_underlying_type (b);
|
if (stack_slot_is_managed_pointer (b)) {
|
idxb = TYPE_PTR;
|
complexMerge = 2;
|
}
|
|
--idxa;
|
--idxb;
|
res = table [idxa][idxb];
|
|
VERIFIER_DEBUG ( printf ("binop res %d\n", res); );
|
VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
|
|
top = stack_push (ctx);
|
if (res == TYPE_INV) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction applyed to ill formed stack (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
|
copy_stack_value (top, a);
|
return;
|
}
|
|
if (res & NON_VERIFIABLE_RESULT) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction is not verifiable (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
|
|
res = res & ~NON_VERIFIABLE_RESULT;
|
}
|
|
if (complexMerge && res == TYPE_PTR) {
|
if (complexMerge == 1)
|
copy_stack_value (top, a);
|
else if (complexMerge == 2)
|
copy_stack_value (top, b);
|
/*
|
* There is no need to merge the type of two pointers.
|
* The only valid operation is subtraction, that returns a native
|
* int as result and can be used with any 2 pointer kinds.
|
* This is valid acording to Patition III 1.1.4
|
*/
|
} else
|
top->stype = res;
|
|
}
|
|
|
static void
|
do_boolean_branch_op (VerifyContext *ctx, int delta)
|
{
|
int target = ctx->ip_offset + delta;
|
ILStackDesc *top;
|
|
VERIFIER_DEBUG ( printf ("boolean branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
|
|
if (target < 0 || target >= ctx->code_size) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Boolean branch target out of code at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
|
case 1:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
break;
|
case 2:
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
ctx->target = target;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
top = stack_pop (ctx);
|
if (!is_valid_bool_arg (top))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Argument type %s not valid for brtrue/brfalse at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
|
|
check_unmanaged_pointer (ctx, top);
|
}
|
|
static gboolean
|
stack_slot_is_complex_type_not_reference_type (ILStackDesc *slot)
|
{
|
return stack_slot_get_type (slot) == TYPE_COMPLEX && !MONO_TYPE_IS_REFERENCE (slot->type) && !stack_slot_is_boxed_value (slot);
|
}
|
|
static gboolean
|
stack_slot_is_reference_value (ILStackDesc *slot)
|
{
|
return stack_slot_get_type (slot) == TYPE_COMPLEX && (MONO_TYPE_IS_REFERENCE (slot->type) || stack_slot_is_boxed_value (slot));
|
}
|
|
static void
|
do_branch_op (VerifyContext *ctx, signed int delta, const unsigned char table [TYPE_MAX][TYPE_MAX])
|
{
|
ILStackDesc *a, *b;
|
int idxa, idxb;
|
unsigned char res;
|
int target = ctx->ip_offset + delta;
|
|
VERIFIER_DEBUG ( printf ("branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
|
|
if (target < 0 || target >= ctx->code_size) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
switch (is_valid_cmp_branch_instruction (ctx->header, ctx->ip_offset, target)) {
|
case 1: /*FIXME use constants and not magic numbers.*/
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
break;
|
case 2:
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
ctx->target = target;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
b = stack_pop (ctx);
|
a = stack_pop (ctx);
|
|
idxa = stack_slot_get_underlying_type (a);
|
if (stack_slot_is_managed_pointer (a))
|
idxa = TYPE_PTR;
|
|
idxb = stack_slot_get_underlying_type (b);
|
if (stack_slot_is_managed_pointer (b))
|
idxb = TYPE_PTR;
|
|
if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
|
res = TYPE_INV;
|
} else {
|
--idxa;
|
--idxb;
|
res = table [idxa][idxb];
|
}
|
|
VERIFIER_DEBUG ( printf ("branch res %d\n", res); );
|
VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
|
|
if (res == TYPE_INV) {
|
CODE_NOT_VERIFIABLE (ctx,
|
g_strdup_printf ("Compare and Branch instruction applyed to ill formed stack (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
|
} else if (res & NON_VERIFIABLE_RESULT) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare and Branch instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
|
res = res & ~NON_VERIFIABLE_RESULT;
|
}
|
}
|
|
static void
|
do_cmp_op (VerifyContext *ctx, const unsigned char table [TYPE_MAX][TYPE_MAX], guint32 opcode)
|
{
|
ILStackDesc *a, *b;
|
int idxa, idxb;
|
unsigned char res;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
b = stack_pop (ctx);
|
a = stack_pop (ctx);
|
|
if (opcode == CEE_CGT_UN) {
|
if ((stack_slot_is_reference_value (a) && stack_slot_is_null_literal (b)) ||
|
(stack_slot_is_reference_value (b) && stack_slot_is_null_literal (a))) {
|
stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
return;
|
}
|
}
|
|
idxa = stack_slot_get_underlying_type (a);
|
if (stack_slot_is_managed_pointer (a))
|
idxa = TYPE_PTR;
|
|
idxb = stack_slot_get_underlying_type (b);
|
if (stack_slot_is_managed_pointer (b))
|
idxb = TYPE_PTR;
|
|
if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
|
res = TYPE_INV;
|
} else {
|
--idxa;
|
--idxb;
|
res = table [idxa][idxb];
|
}
|
|
if(res == TYPE_INV) {
|
char *left_type = stack_slot_full_name (a);
|
char *right_type = stack_slot_full_name (b);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf("Compare instruction applyed to ill formed stack (%s x %s) at 0x%04x", left_type, right_type, ctx->ip_offset));
|
g_free (left_type);
|
g_free (right_type);
|
} else if (res & NON_VERIFIABLE_RESULT) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
|
res = res & ~NON_VERIFIABLE_RESULT;
|
}
|
stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
}
|
|
static void
|
do_ret (VerifyContext *ctx)
|
{
|
MonoType *ret = ctx->signature->ret;
|
VERIFIER_DEBUG ( printf ("checking ret\n"); );
|
if (ret->type != MONO_TYPE_VOID) {
|
ILStackDesc *top;
|
if (!check_underflow (ctx, 1))
|
return;
|
|
top = stack_pop(ctx);
|
|
if (!verify_stack_type_compatibility (ctx, ctx->signature->ret, top)) {
|
char *ret_type = mono_type_full_name (ctx->signature->ret);
|
char *stack_type = stack_slot_full_name (top);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible return value on stack with method signature, expected '%s' but got '%s' at 0x%04x", ret_type, stack_type, ctx->ip_offset));
|
g_free (stack_type);
|
g_free (ret_type);
|
return;
|
}
|
|
if (ret->byref && !stack_slot_is_safe_byref (top))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref and return value is not a safe-to-return-byref at 0x%04x", ctx->ip_offset));
|
|
if (ret->type == MONO_TYPE_TYPEDBYREF || mono_type_is_value_type (ret, "System", "ArgIterator") || mono_type_is_value_type (ret, "System", "RuntimeArgumentHandle"))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref, TypedReference, ArgIterator or RuntimeArgumentHandle at 0x%04x", ctx->ip_offset));
|
}
|
|
if (ctx->eval.size > 0) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack not empty (%d) after ret at 0x%04x", ctx->eval.size, ctx->ip_offset));
|
}
|
if (in_any_block (ctx->header, ctx->ip_offset))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ret cannot escape exception blocks at 0x%04x", ctx->ip_offset));
|
}
|
|
/*
|
* FIXME we need to fix the case of a non-virtual instance method defined in the parent but call using a token pointing to a subclass.
|
* This is illegal but mono_get_method_full decoded it.
|
* TODO handle calling .ctor outside one or calling the .ctor for other class but super
|
*/
|
static void
|
do_invoke_method (VerifyContext *ctx, int method_token, gboolean virtual_)
|
{
|
MonoError error;
|
int param_count, i;
|
MonoMethodSignature *sig;
|
ILStackDesc *value;
|
MonoMethod *method;
|
gboolean virt_check_this = FALSE;
|
gboolean constrained = ctx->prefix_set & PREFIX_CONSTRAINED;
|
|
if (!(method = verifier_load_method (ctx, method_token, virtual_ ? "callvirt" : "call")))
|
return;
|
|
if (virtual_) {
|
CLEAR_PREFIX (ctx, PREFIX_CONSTRAINED);
|
|
if (method->klass->valuetype) // && !constrained ???
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with valuetype method at 0x%04x", ctx->ip_offset));
|
|
if ((method->flags & METHOD_ATTRIBUTE_STATIC))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with static method at 0x%04x", ctx->ip_offset));
|
|
} else {
|
if (method->flags & METHOD_ATTRIBUTE_ABSTRACT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use call with an abstract method at 0x%04x", ctx->ip_offset));
|
|
if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !mono_class_is_sealed (method->klass)) {
|
virt_check_this = TRUE;
|
ctx->code [ctx->ip_offset].flags |= IL_CODE_CALL_NONFINAL_VIRTUAL;
|
}
|
}
|
|
if (!(sig = mono_method_get_signature_checked (method, ctx->image, method_token, ctx->generic_context, &error))) {
|
mono_error_cleanup (&error);
|
sig = mono_method_get_signature_checked (method, ctx->image, method_token, NULL, &error);
|
}
|
|
if (!sig) {
|
char *name = mono_type_get_full_name (method->klass);
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve signature of %s:%s at 0x%04x due to: %s", name, method->name, ctx->ip_offset, mono_error_get_message (&error)));
|
mono_error_cleanup (&error);
|
g_free (name);
|
return;
|
}
|
|
param_count = sig->param_count + sig->hasthis;
|
if (!check_underflow (ctx, param_count))
|
return;
|
|
gboolean is_safe_byref_call = TRUE;
|
|
for (i = sig->param_count - 1; i >= 0; --i) {
|
VERIFIER_DEBUG ( printf ("verifying argument %d\n", i); );
|
value = stack_pop (ctx);
|
if (!verify_stack_type_compatibility (ctx, sig->params[i], value)) {
|
char *stack_name = stack_slot_full_name (value);
|
char *sig_name = mono_type_full_name (sig->params [i]);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter with function signature: Calling method with signature (%s) but for argument %d there is a (%s) on stack at 0x%04x", sig_name, i, stack_name, ctx->ip_offset));
|
g_free (stack_name);
|
g_free (sig_name);
|
}
|
|
if (stack_slot_is_managed_mutability_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of %s at 0x%04x", virtual_ ? "callvirt" : "call", ctx->ip_offset));
|
|
if ((ctx->prefix_set & PREFIX_TAIL) && stack_slot_is_managed_pointer (value)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot pass a byref argument to a tail %s at 0x%04x", virtual_ ? "callvirt" : "call", ctx->ip_offset));
|
return;
|
}
|
if (stack_slot_is_managed_pointer (value) && !stack_slot_is_safe_byref (value))
|
is_safe_byref_call = FALSE;
|
}
|
|
if (sig->hasthis) {
|
MonoType *type = &method->klass->byval_arg;
|
ILStackDesc copy;
|
|
if (mono_method_is_constructor (method) && !method->klass->valuetype) {
|
if (IS_STRICT_MODE (ctx) && !mono_method_is_constructor (ctx->method))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor outside one at 0x%04x", ctx->ip_offset));
|
if (IS_STRICT_MODE (ctx) && method->klass != ctx->method->klass->parent && method->klass != ctx->method->klass)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor of a type different from this or super at 0x%04x", ctx->ip_offset));
|
|
ctx->super_ctor_called = TRUE;
|
value = stack_pop_safe (ctx);
|
if (IS_STRICT_MODE (ctx) && (value->stype & THIS_POINTER_MASK) != THIS_POINTER_MASK)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid 'this ptr' argument for constructor at 0x%04x", ctx->ip_offset));
|
if (!(value->stype & UNINIT_THIS_MASK))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Calling the base constructor on an initialized this pointer at 0x%04x", ctx->ip_offset));
|
} else {
|
value = stack_pop (ctx);
|
}
|
|
copy_stack_value (©, value);
|
//TODO we should extract this to a 'drop_byref_argument' and use everywhere
|
//Other parts of the code suffer from the same issue of
|
copy.type = mono_type_get_type_byval (copy.type);
|
copy.stype &= ~POINTER_MASK;
|
|
if (virt_check_this && !stack_slot_is_this_pointer (value) && !(method->klass->valuetype || stack_slot_is_boxed_value (value)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the call opcode with a non-final virtual method on an object different than the 'this' pointer at 0x%04x", ctx->ip_offset));
|
|
if (constrained && virtual_) {
|
if (!stack_slot_is_managed_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object is not a managed pointer for a constrained call at 0x%04x", ctx->ip_offset));
|
if (!mono_metadata_type_equal_full (mono_type_get_type_byval (value->type), mono_type_get_underlying_type (ctx->constrained_type), TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object not compatible with constrained type at 0x%04x", ctx->ip_offset));
|
copy.stype |= BOXED_MASK;
|
copy.type = ctx->constrained_type;
|
} else {
|
if (stack_slot_is_managed_pointer (value) && !mono_class_from_mono_type (value->type)->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a reference type using a managed pointer to the this arg at 0x%04x", ctx->ip_offset));
|
|
if (!virtual_ && mono_class_from_mono_type (value->type)->valuetype && !method->klass->valuetype && !stack_slot_is_boxed_value (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a valuetype baseclass at 0x%04x", ctx->ip_offset));
|
|
if (virtual_ && mono_class_from_mono_type (value->type)->valuetype && !stack_slot_is_boxed_value (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a valuetype with callvirt at 0x%04x", ctx->ip_offset));
|
|
if (method->klass->valuetype && (stack_slot_is_boxed_value (value) || !stack_slot_is_managed_pointer (value)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a boxed or literal valuetype to call a valuetype method at 0x%04x", ctx->ip_offset));
|
}
|
if (!verify_stack_type_compatibility (ctx, type, ©)) {
|
char *expected = mono_type_full_name (type);
|
char *effective = stack_slot_full_name (©);
|
char *method_name = mono_method_full_name (method, TRUE);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible this argument on stack with method signature expected '%s' but got '%s' for a call to '%s' at 0x%04x",
|
expected, effective, method_name, ctx->ip_offset));
|
g_free (method_name);
|
g_free (effective);
|
g_free (expected);
|
}
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, mono_class_from_mono_type (value->type))) {
|
char *name = mono_method_full_name (method, TRUE);
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
|
g_free (name);
|
}
|
|
} else if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
|
char *name = mono_method_full_name (method, TRUE);
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
|
g_free (name);
|
}
|
|
if (sig->ret->type != MONO_TYPE_VOID) {
|
if (!mono_type_is_valid_in_context (ctx, sig->ret))
|
return;
|
|
if (check_overflow (ctx)) {
|
value = stack_push (ctx);
|
set_stack_value (ctx, value, sig->ret, FALSE);
|
if ((ctx->prefix_set & PREFIX_READONLY) && method->klass->rank && !strcmp (method->name, "Address")) {
|
ctx->prefix_set &= ~PREFIX_READONLY;
|
value->stype |= CMMP_MASK;
|
}
|
if (sig->ret->byref && is_safe_byref_call)
|
value->stype |= SAFE_BYREF_MASK;
|
}
|
}
|
|
if ((ctx->prefix_set & PREFIX_TAIL)) {
|
if (!mono_delegate_ret_equal (mono_method_signature (ctx->method)->ret, sig->ret))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call with incompatible return type at 0x%04x", ctx->ip_offset));
|
if (ctx->header->code [ctx->ip_offset + 5] != CEE_RET)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call not followed by ret at 0x%04x", ctx->ip_offset));
|
}
|
|
}
|
|
static void
|
do_push_static_field (VerifyContext *ctx, int token, gboolean take_addr)
|
{
|
MonoClassField *field;
|
MonoClass *klass;
|
if (!check_overflow (ctx))
|
return;
|
if (!take_addr)
|
CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
|
|
if (!(field = verifier_load_field (ctx, token, &klass, take_addr ? "ldsflda" : "ldsfld")))
|
return;
|
|
if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot load non static field at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
/*taking the address of initonly field only works from the static constructor */
|
if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
|
!(field->parent == ctx->method->klass && (ctx->method->flags & (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_STATIC)) && !strcmp (".cctor", ctx->method->name)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
|
|
ILStackDesc *value = stack_push (ctx);
|
set_stack_value (ctx, value, field->type, take_addr);
|
if (take_addr)
|
value->stype |= SAFE_BYREF_MASK;
|
}
|
|
static void
|
do_store_static_field (VerifyContext *ctx, int token) {
|
MonoClassField *field;
|
MonoClass *klass;
|
ILStackDesc *value;
|
CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
|
if (!(field = verifier_load_field (ctx, token, &klass, "stsfld")))
|
return;
|
|
if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot store non static field at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (field->type->type == MONO_TYPE_TYPEDBYREF) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type in store static field at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
|
|
if (!verify_stack_type_compatibility (ctx, field->type, value)) {
|
char *stack_name = stack_slot_full_name (value);
|
char *field_name = mono_type_full_name (field->type);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type in static field store expected '%s' but found '%s' at 0x%04x",
|
field_name, stack_name, ctx->ip_offset));
|
g_free (field_name);
|
g_free (stack_name);
|
}
|
}
|
|
static gboolean
|
check_is_valid_type_for_field_ops (VerifyContext *ctx, int token, ILStackDesc *obj, MonoClassField **ret_field, const char *opcode)
|
{
|
MonoClassField *field;
|
MonoClass *klass;
|
gboolean is_pointer;
|
|
/*must be a reference type, a managed pointer, an unamanaged pointer, or a valuetype*/
|
if (!(field = verifier_load_field (ctx, token, &klass, opcode)))
|
return FALSE;
|
|
*ret_field = field;
|
//the value on stack is going to be used as a pointer
|
is_pointer = stack_slot_get_type (obj) == TYPE_PTR || (stack_slot_get_type (obj) == TYPE_NATIVE_INT && !get_stack_type (&field->parent->byval_arg));
|
|
if (field->type->type == MONO_TYPE_TYPEDBYREF) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type at 0x%04x", ctx->ip_offset));
|
return FALSE;
|
}
|
g_assert (obj->type);
|
|
/*The value on the stack must be a subclass of the defining type of the field*/
|
/* we need to check if we can load the field from the stack value*/
|
if (is_pointer) {
|
if (stack_slot_get_underlying_type (obj) == TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Native int is not a verifiable type to reference a field at 0x%04x", ctx->ip_offset));
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
|
} else {
|
if (!field->parent->valuetype && stack_slot_is_managed_pointer (obj))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a managed pointer to a reference type and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
|
|
/*a value type can be loaded from a value or a managed pointer, but not a boxed object*/
|
if (field->parent->valuetype && stack_slot_is_boxed_value (obj))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a boxed valuetype and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
|
|
if (!stack_slot_is_null_literal (obj) && !verify_stack_type_compatibility_full (ctx, &field->parent->byval_arg, obj, TRUE, FALSE)) {
|
char *found = stack_slot_full_name (obj);
|
char *expected = mono_type_full_name (&field->parent->byval_arg);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected type '%s' but found '%s' referencing the 'this' argument at 0x%04x", expected, found, ctx->ip_offset));
|
g_free (found);
|
g_free (expected);
|
}
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, mono_class_from_mono_type (obj->type)))
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
|
}
|
|
check_unmanaged_pointer (ctx, obj);
|
return TRUE;
|
}
|
|
static void
|
do_push_field (VerifyContext *ctx, int token, gboolean take_addr)
|
{
|
ILStackDesc *obj;
|
MonoClassField *field;
|
gboolean is_safe_byref = FALSE;
|
|
if (!take_addr)
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!check_underflow (ctx, 1))
|
return;
|
obj = stack_pop_safe (ctx);
|
|
if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, take_addr ? "ldflda" : "ldfld"))
|
return;
|
|
if (take_addr && field->parent->valuetype && !stack_slot_is_managed_pointer (obj))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a temporary value-type at 0x%04x", ctx->ip_offset));
|
|
if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
|
!(field->parent == ctx->method->klass && mono_method_is_constructor (ctx->method)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
|
|
//must do it here cuz stack_push will return the same slot as obj above
|
is_safe_byref = take_addr && (stack_slot_is_reference_value (obj) || stack_slot_is_safe_byref (obj));
|
|
ILStackDesc *value = stack_push (ctx);
|
set_stack_value (ctx, value, field->type, take_addr);
|
|
if (is_safe_byref)
|
value->stype |= SAFE_BYREF_MASK;
|
}
|
|
static void
|
do_store_field (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *value, *obj;
|
MonoClassField *field;
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
value = stack_pop (ctx);
|
obj = stack_pop_safe (ctx);
|
|
if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, "stfld"))
|
return;
|
|
if (!verify_stack_type_compatibility (ctx, field->type, value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in field store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
}
|
|
/*TODO proper handle for Nullable<T>*/
|
static void
|
do_box_value (VerifyContext *ctx, int klass_token)
|
{
|
ILStackDesc *value;
|
MonoType *type = get_boxable_mono_type (ctx, klass_token, "box");
|
MonoClass *klass;
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
/*box is a nop for reference types*/
|
|
if (stack_slot_get_underlying_type (value) == TYPE_COMPLEX && MONO_TYPE_IS_REFERENCE (value->type) && MONO_TYPE_IS_REFERENCE (type)) {
|
stack_push_stack_val (ctx, value)->stype |= BOXED_MASK;
|
return;
|
}
|
|
|
if (!verify_stack_type_compatibility (ctx, type, value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for boxing operation at 0x%04x", ctx->ip_offset));
|
|
klass = mono_class_from_mono_type (type);
|
if (mono_class_is_nullable (klass))
|
type = &mono_class_get_nullable_param (klass)->byval_arg;
|
stack_push_val (ctx, TYPE_COMPLEX | BOXED_MASK, type);
|
}
|
|
static void
|
do_unbox_value (VerifyContext *ctx, int klass_token)
|
{
|
ILStackDesc *value;
|
MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox");
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
if (!mono_class_from_mono_type (type)->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid reference type for unbox at 0x%04x", ctx->ip_offset));
|
|
value = stack_pop (ctx);
|
|
/*Value should be: a boxed valuetype or a reference type*/
|
if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
|
(stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
|
set_stack_value (ctx, value = stack_push (ctx), mono_type_get_type_byref (type), FALSE);
|
value->stype |= CMMP_MASK;
|
}
|
|
static void
|
do_unbox_any (VerifyContext *ctx, int klass_token)
|
{
|
ILStackDesc *value;
|
MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox.any");
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
|
/*Value should be: a boxed valuetype or a reference type*/
|
if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
|
(stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox.any operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
|
set_stack_value (ctx, stack_push (ctx), type, FALSE);
|
}
|
|
static void
|
do_unary_math_op (VerifyContext *ctx, int op)
|
{
|
ILStackDesc *value;
|
if (!check_underflow (ctx, 1))
|
return;
|
value = stack_pop (ctx);
|
switch (stack_slot_get_type (value)) {
|
case TYPE_I4:
|
case TYPE_I8:
|
case TYPE_NATIVE_INT:
|
break;
|
case TYPE_R8:
|
if (op == CEE_NEG)
|
break;
|
case TYPE_COMPLEX: /*only enums are ok*/
|
if (mono_type_is_enum_type (value->type))
|
break;
|
default:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for unary not at 0x%04x", ctx->ip_offset));
|
}
|
stack_push_stack_val (ctx, value);
|
}
|
|
static void
|
do_conversion (VerifyContext *ctx, int kind)
|
{
|
ILStackDesc *value;
|
if (!check_underflow (ctx, 1))
|
return;
|
value = stack_pop (ctx);
|
|
switch (stack_slot_get_type (value)) {
|
case TYPE_I4:
|
case TYPE_I8:
|
case TYPE_NATIVE_INT:
|
case TYPE_R8:
|
break;
|
default:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type (%s) at stack for conversion operation. Numeric type expected at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
}
|
|
switch (kind) {
|
case TYPE_I4:
|
stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
break;
|
case TYPE_I8:
|
stack_push_val (ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
|
break;
|
case TYPE_R8:
|
stack_push_val (ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
|
break;
|
case TYPE_NATIVE_INT:
|
stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
|
break;
|
default:
|
g_error ("unknown type %02x in conversion", kind);
|
|
}
|
}
|
|
static void
|
do_load_token (VerifyContext *ctx, int token)
|
{
|
MonoError error;
|
gpointer handle;
|
MonoClass *handle_class;
|
if (!check_overflow (ctx))
|
return;
|
|
if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
|
handle = mono_method_get_wrapper_data (ctx->method, token);
|
handle_class = (MonoClass *)mono_method_get_wrapper_data (ctx->method, token + 1);
|
if (handle_class == mono_defaults.typehandle_class)
|
handle = &((MonoClass*)handle)->byval_arg;
|
} else {
|
switch (token & 0xff000000) {
|
case MONO_TOKEN_TYPE_DEF:
|
case MONO_TOKEN_TYPE_REF:
|
case MONO_TOKEN_TYPE_SPEC:
|
case MONO_TOKEN_FIELD_DEF:
|
case MONO_TOKEN_METHOD_DEF:
|
case MONO_TOKEN_METHOD_SPEC:
|
case MONO_TOKEN_MEMBER_REF:
|
if (!token_bounds_check (ctx->image, token)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Table index out of range 0x%x for token %x for ldtoken at 0x%04x", mono_metadata_token_index (token), token, ctx->ip_offset));
|
return;
|
}
|
break;
|
default:
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid table 0x%x for token 0x%x for ldtoken at 0x%04x", mono_metadata_token_table (token), token, ctx->ip_offset));
|
return;
|
}
|
|
handle = mono_ldtoken_checked (ctx->image, token, &handle_class, ctx->generic_context, &error);
|
}
|
|
if (!handle) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid token 0x%x for ldtoken at 0x%04x due to %s", token, ctx->ip_offset, mono_error_get_message (&error)));
|
mono_error_cleanup (&error);
|
return;
|
}
|
if (handle_class == mono_defaults.typehandle_class) {
|
mono_type_is_valid_in_context (ctx, (MonoType*)handle);
|
} else if (handle_class == mono_defaults.methodhandle_class) {
|
mono_method_is_valid_in_context (ctx, (MonoMethod*)handle);
|
} else if (handle_class == mono_defaults.fieldhandle_class) {
|
mono_type_is_valid_in_context (ctx, &((MonoClassField*)handle)->parent->byval_arg);
|
} else {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid ldtoken type %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
}
|
stack_push_val (ctx, TYPE_COMPLEX, mono_class_get_type (handle_class));
|
}
|
|
static void
|
do_ldobj_value (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *value;
|
MonoType *type = get_boxable_mono_type (ctx, token, "ldobj");
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
if (!stack_slot_is_managed_pointer (value)
|
&& stack_slot_get_type (value) != TYPE_NATIVE_INT
|
&& !(stack_slot_get_type (value) == TYPE_PTR && value->type->type != MONO_TYPE_FNPTR)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid argument %s to ldobj at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
return;
|
}
|
|
if (stack_slot_get_type (value) == TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Using native pointer to ldobj at 0x%04x", ctx->ip_offset));
|
|
/*We have a byval on the stack, but the comparison must be strict. */
|
if (!verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (value->type), TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldojb operation at 0x%04x", ctx->ip_offset));
|
|
set_stack_value (ctx, stack_push (ctx), type, FALSE);
|
}
|
|
static void
|
do_stobj (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *dest, *src;
|
MonoType *type = get_boxable_mono_type (ctx, token, "stobj");
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
src = stack_pop (ctx);
|
dest = stack_pop (ctx);
|
|
if (stack_slot_is_managed_mutability_pointer (dest))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stobj at 0x%04x", ctx->ip_offset));
|
|
if (!stack_slot_is_managed_pointer (dest))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of stobj operation at 0x%04x", ctx->ip_offset));
|
|
if (stack_slot_is_boxed_value (src) && !MONO_TYPE_IS_REFERENCE (src->type) && !MONO_TYPE_IS_REFERENCE (type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
|
|
if (!verify_stack_type_compatibility (ctx, type, src)) {
|
char *type_name = mono_type_full_name (type);
|
char *src_name = stack_slot_full_name (src);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token '%s' and source '%s' of stobj don't match ' at 0x%04x", type_name, src_name, ctx->ip_offset));
|
g_free (type_name);
|
g_free (src_name);
|
}
|
|
if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of stobj don't match at 0x%04x", ctx->ip_offset));
|
}
|
|
static void
|
do_cpobj (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *dest, *src;
|
MonoType *type = get_boxable_mono_type (ctx, token, "cpobj");
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
src = stack_pop (ctx);
|
dest = stack_pop (ctx);
|
|
if (!stack_slot_is_managed_pointer (src))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid source of cpobj operation at 0x%04x", ctx->ip_offset));
|
|
if (!stack_slot_is_managed_pointer (dest))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of cpobj operation at 0x%04x", ctx->ip_offset));
|
|
if (stack_slot_is_managed_mutability_pointer (dest))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with cpobj at 0x%04x", ctx->ip_offset));
|
|
if (!verify_type_compatibility (ctx, type, mono_type_get_type_byval (src->type)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token and source types of cpobj don't match at 0x%04x", ctx->ip_offset));
|
|
if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of cpobj don't match at 0x%04x", ctx->ip_offset));
|
}
|
|
static void
|
do_initobj (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *obj;
|
MonoType *stack, *type = get_boxable_mono_type (ctx, token, "initobj");
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
obj = stack_pop (ctx);
|
|
if (!stack_slot_is_managed_pointer (obj))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object address for initobj at 0x%04x", ctx->ip_offset));
|
|
if (stack_slot_is_managed_mutability_pointer (obj))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with initobj at 0x%04x", ctx->ip_offset));
|
|
stack = mono_type_get_type_byval (obj->type);
|
if (MONO_TYPE_IS_REFERENCE (stack)) {
|
if (!verify_type_compatibility (ctx, stack, type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
|
else if (IS_STRICT_MODE (ctx) && !mono_metadata_type_equal (type, stack))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
|
} else if (!verify_type_compatibility (ctx, stack, type)) {
|
char *expected_name = mono_type_full_name (type);
|
char *stack_name = mono_type_full_name (stack);
|
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Initobj %s not compatible with value on stack %s at 0x%04x", expected_name, stack_name, ctx->ip_offset));
|
g_free (expected_name);
|
g_free (stack_name);
|
}
|
}
|
|
static void
|
do_newobj (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *value;
|
int i;
|
MonoMethodSignature *sig;
|
MonoMethod *method;
|
gboolean is_delegate = FALSE;
|
|
if (!(method = verifier_load_method (ctx, token, "newobj")))
|
return;
|
|
if (!mono_method_is_constructor (method)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method from token 0x%08x not a constructor at 0x%04x", token, ctx->ip_offset));
|
return;
|
}
|
|
if (mono_class_get_flags (method->klass) & (TYPE_ATTRIBUTE_ABSTRACT | TYPE_ATTRIBUTE_INTERFACE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Trying to instantiate an abstract or interface type at 0x%04x", ctx->ip_offset));
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
|
char *from = mono_method_full_name (ctx->method, TRUE);
|
char *to = mono_method_full_name (method, TRUE);
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Constructor %s not visible from %s at 0x%04x", to, from, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
|
g_free (from);
|
g_free (to);
|
}
|
|
//FIXME use mono_method_get_signature_full
|
sig = mono_method_signature (method);
|
if (!sig) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature to newobj at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (!sig->hasthis) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature missing hasthis at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (!check_underflow (ctx, sig->param_count))
|
return;
|
|
is_delegate = method->klass->parent == mono_defaults.multicastdelegate_class;
|
|
if (is_delegate) {
|
ILStackDesc *funptr;
|
//first arg is object, second arg is fun ptr
|
if (sig->param_count != 2) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid delegate constructor at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
funptr = stack_pop (ctx);
|
value = stack_pop (ctx);
|
verify_delegate_compatibility (ctx, method->klass, value, funptr);
|
} else {
|
for (i = sig->param_count - 1; i >= 0; --i) {
|
VERIFIER_DEBUG ( printf ("verifying constructor argument %d\n", i); );
|
value = stack_pop (ctx);
|
if (!verify_stack_type_compatibility (ctx, sig->params [i], value)) {
|
char *stack_name = stack_slot_full_name (value);
|
char *sig_name = mono_type_full_name (sig->params [i]);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter value with constructor signature: %s X %s at 0x%04x", sig_name, stack_name, ctx->ip_offset));
|
g_free (stack_name);
|
g_free (sig_name);
|
}
|
|
if (stack_slot_is_managed_mutability_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of newobj at 0x%04x", ctx->ip_offset));
|
}
|
}
|
|
if (check_overflow (ctx))
|
set_stack_value (ctx, stack_push (ctx), &method->klass->byval_arg, FALSE);
|
}
|
|
static void
|
do_cast (VerifyContext *ctx, int token, const char *opcode) {
|
ILStackDesc *value;
|
MonoType *type;
|
gboolean is_boxed;
|
gboolean do_box;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
if (!(type = get_boxable_mono_type (ctx, token, opcode)))
|
return;
|
|
if (type->byref) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid %s type at 0x%04x", opcode, ctx->ip_offset));
|
return;
|
}
|
|
value = stack_pop (ctx);
|
is_boxed = stack_slot_is_boxed_value (value);
|
|
if (stack_slot_is_managed_pointer (value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
|
else if (!MONO_TYPE_IS_REFERENCE (value->type) && !is_boxed) {
|
char *name = stack_slot_full_name (value);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a reference type on stack for %s but found %s at 0x%04x", opcode, name, ctx->ip_offset));
|
g_free (name);
|
}
|
|
switch (value->type->type) {
|
case MONO_TYPE_FNPTR:
|
case MONO_TYPE_PTR:
|
case MONO_TYPE_TYPEDBYREF:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
|
default:
|
break;
|
}
|
|
do_box = is_boxed || mono_type_is_generic_argument(type) || mono_class_from_mono_type (type)->valuetype;
|
stack_push_val (ctx, TYPE_COMPLEX | (do_box ? BOXED_MASK : 0), type);
|
}
|
|
static MonoType *
|
mono_type_from_opcode (int opcode) {
|
switch (opcode) {
|
case CEE_LDIND_I1:
|
case CEE_LDIND_U1:
|
case CEE_STIND_I1:
|
case CEE_LDELEM_I1:
|
case CEE_LDELEM_U1:
|
case CEE_STELEM_I1:
|
return &mono_defaults.sbyte_class->byval_arg;
|
|
case CEE_LDIND_I2:
|
case CEE_LDIND_U2:
|
case CEE_STIND_I2:
|
case CEE_LDELEM_I2:
|
case CEE_LDELEM_U2:
|
case CEE_STELEM_I2:
|
return &mono_defaults.int16_class->byval_arg;
|
|
case CEE_LDIND_I4:
|
case CEE_LDIND_U4:
|
case CEE_STIND_I4:
|
case CEE_LDELEM_I4:
|
case CEE_LDELEM_U4:
|
case CEE_STELEM_I4:
|
return &mono_defaults.int32_class->byval_arg;
|
|
case CEE_LDIND_I8:
|
case CEE_STIND_I8:
|
case CEE_LDELEM_I8:
|
case CEE_STELEM_I8:
|
return &mono_defaults.int64_class->byval_arg;
|
|
case CEE_LDIND_R4:
|
case CEE_STIND_R4:
|
case CEE_LDELEM_R4:
|
case CEE_STELEM_R4:
|
return &mono_defaults.single_class->byval_arg;
|
|
case CEE_LDIND_R8:
|
case CEE_STIND_R8:
|
case CEE_LDELEM_R8:
|
case CEE_STELEM_R8:
|
return &mono_defaults.double_class->byval_arg;
|
|
case CEE_LDIND_I:
|
case CEE_STIND_I:
|
case CEE_LDELEM_I:
|
case CEE_STELEM_I:
|
return &mono_defaults.int_class->byval_arg;
|
|
case CEE_LDIND_REF:
|
case CEE_STIND_REF:
|
case CEE_LDELEM_REF:
|
case CEE_STELEM_REF:
|
return &mono_defaults.object_class->byval_arg;
|
|
default:
|
g_error ("unknown opcode %02x in mono_type_from_opcode ", opcode);
|
return NULL;
|
}
|
}
|
|
static void
|
do_load_indirect (VerifyContext *ctx, int opcode)
|
{
|
ILStackDesc *value;
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
if (!stack_slot_is_managed_pointer (value)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Load indirect not using a manager pointer at 0x%04x", ctx->ip_offset));
|
set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
|
return;
|
}
|
|
if (opcode == CEE_LDIND_REF) {
|
if (stack_slot_get_underlying_type (value) != TYPE_COMPLEX || mono_class_from_mono_type (value->type)->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind_ref expected object byref operation at 0x%04x", ctx->ip_offset));
|
set_stack_value (ctx, stack_push (ctx), mono_type_get_type_byval (value->type), FALSE);
|
} else {
|
if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (value->type), TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
|
set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
|
}
|
}
|
|
static void
|
do_store_indirect (VerifyContext *ctx, int opcode)
|
{
|
ILStackDesc *addr, *val;
|
CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
val = stack_pop (ctx);
|
addr = stack_pop (ctx);
|
|
check_unmanaged_pointer (ctx, addr);
|
|
if (!stack_slot_is_managed_pointer (addr) && stack_slot_get_type (addr) != TYPE_PTR) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid non-pointer argument to stind at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (stack_slot_is_managed_mutability_pointer (addr)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stind at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (addr->type), TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid addr type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
|
|
if (!verify_stack_type_compatibility (ctx, mono_type_from_opcode (opcode), val))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
|
}
|
|
static void
|
do_newarr (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *value;
|
MonoType *type = get_boxable_mono_type (ctx, token, "newarr");
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Array size type on stack (%s) is not a verifiable type at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
|
|
set_stack_value (ctx, stack_push (ctx), mono_class_get_type (mono_array_class_get (mono_class_from_mono_type (type), 1)), FALSE);
|
}
|
|
/*FIXME handle arrays that are not 0-indexed*/
|
static void
|
do_ldlen (VerifyContext *ctx)
|
{
|
ILStackDesc *value;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
|
if (stack_slot_get_type (value) != TYPE_COMPLEX || value->type->type != MONO_TYPE_SZARRAY)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type for ldlen at 0x%04x", ctx->ip_offset));
|
|
stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
|
}
|
|
/*FIXME handle arrays that are not 0-indexed*/
|
/*FIXME handle readonly prefix and CMMP*/
|
static void
|
do_ldelema (VerifyContext *ctx, int klass_token)
|
{
|
ILStackDesc *index, *array, *res;
|
MonoType *type = get_boxable_mono_type (ctx, klass_token, "ldelema");
|
gboolean valid;
|
|
if (!type)
|
return;
|
|
if (!check_underflow (ctx, 2))
|
return;
|
|
index = stack_pop (ctx);
|
array = stack_pop (ctx);
|
|
if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelema is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
|
|
if (!stack_slot_is_null_literal (array)) {
|
if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelema at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
|
else {
|
if (get_stack_type (type) == TYPE_I4 || get_stack_type (type) == TYPE_NATIVE_INT) {
|
valid = verify_type_compatibility_full (ctx, type, &array->type->data.klass->byval_arg, TRUE);
|
} else {
|
valid = mono_metadata_type_equal (type, &array->type->data.klass->byval_arg);
|
}
|
if (!valid)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelema at 0x%04x", ctx->ip_offset));
|
}
|
}
|
|
res = stack_push (ctx);
|
set_stack_value (ctx, res, type, TRUE);
|
if (ctx->prefix_set & PREFIX_READONLY) {
|
ctx->prefix_set &= ~PREFIX_READONLY;
|
res->stype |= CMMP_MASK;
|
}
|
|
res->stype |= SAFE_BYREF_MASK;
|
}
|
|
/*
|
* FIXME handle arrays that are not 0-indexed
|
* FIXME handle readonly prefix and CMMP
|
*/
|
static void
|
do_ldelem (VerifyContext *ctx, int opcode, int token)
|
{
|
#define IS_ONE_OF2(T, A, B) (T == A || T == B)
|
ILStackDesc *index, *array;
|
MonoType *type;
|
if (!check_underflow (ctx, 2))
|
return;
|
|
if (opcode == CEE_LDELEM) {
|
if (!(type = verifier_load_type (ctx, token, "ldelem.any"))) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
|
return;
|
}
|
} else {
|
type = mono_type_from_opcode (opcode);
|
}
|
|
index = stack_pop (ctx);
|
array = stack_pop (ctx);
|
|
if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
|
|
if (!stack_slot_is_null_literal (array)) {
|
if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
|
else {
|
if (opcode == CEE_LDELEM_REF) {
|
if (array->type->data.klass->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for ldelem.ref 0x%04x", ctx->ip_offset));
|
type = &array->type->data.klass->byval_arg;
|
} else {
|
MonoType *candidate = &array->type->data.klass->byval_arg;
|
if (IS_STRICT_MODE (ctx)) {
|
MonoType *underlying_type = mono_type_get_underlying_type_any (type);
|
MonoType *underlying_candidate = mono_type_get_underlying_type_any (candidate);
|
if ((IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I, MONO_TYPE_U)) ||
|
(IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I, MONO_TYPE_U)))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
|
}
|
if (!verify_type_compatibility_full (ctx, type, candidate, TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
|
}
|
}
|
}
|
|
set_stack_value (ctx, stack_push (ctx), type, FALSE);
|
#undef IS_ONE_OF2
|
}
|
|
/*
|
* FIXME handle arrays that are not 0-indexed
|
*/
|
static void
|
do_stelem (VerifyContext *ctx, int opcode, int token)
|
{
|
ILStackDesc *index, *array, *value;
|
MonoType *type;
|
if (!check_underflow (ctx, 3))
|
return;
|
|
if (opcode == CEE_STELEM) {
|
if (!(type = verifier_load_type (ctx, token, "stelem.any"))) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
|
return;
|
}
|
} else {
|
type = mono_type_from_opcode (opcode);
|
}
|
|
value = stack_pop (ctx);
|
index = stack_pop (ctx);
|
array = stack_pop (ctx);
|
|
if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for stdelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
|
|
if (!stack_slot_is_null_literal (array)) {
|
if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for stelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
|
} else {
|
if (opcode == CEE_STELEM_REF) {
|
if (array->type->data.klass->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
|
} else if (!verify_type_compatibility_full (ctx, &array->type->data.klass->byval_arg, type, TRUE)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for stdelem.X at 0x%04x", ctx->ip_offset));
|
}
|
}
|
}
|
if (opcode == CEE_STELEM_REF) {
|
if (!stack_slot_is_boxed_value (value) && mono_class_from_mono_type (value->type)->valuetype)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
|
} else if (opcode != CEE_STELEM_REF) {
|
if (!verify_stack_type_compatibility (ctx, type, value))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value on stack for stdelem.X at 0x%04x", ctx->ip_offset));
|
|
if (stack_slot_is_boxed_value (value) && !MONO_TYPE_IS_REFERENCE (value->type) && !MONO_TYPE_IS_REFERENCE (type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
|
|
}
|
}
|
|
static void
|
do_throw (VerifyContext *ctx)
|
{
|
ILStackDesc *exception;
|
if (!check_underflow (ctx, 1))
|
return;
|
exception = stack_pop (ctx);
|
|
if (!stack_slot_is_null_literal (exception) && !(stack_slot_get_type (exception) == TYPE_COMPLEX && !mono_class_from_mono_type (exception->type)->valuetype))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type at 0x%04x", ctx->ip_offset));
|
|
if (mono_type_is_generic_argument (exception->type) && !stack_slot_is_boxed_value (exception)) {
|
char *name = mono_type_full_name (exception->type);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type but found unboxed %s at 0x%04x ", name, ctx->ip_offset));
|
g_free (name);
|
}
|
/*The stack is left empty after a throw*/
|
ctx->eval.size = 0;
|
}
|
|
|
static void
|
do_endfilter (VerifyContext *ctx)
|
{
|
MonoExceptionClause *clause;
|
|
if (IS_STRICT_MODE (ctx)) {
|
if (ctx->eval.size != 1)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack size must have one item for endfilter at 0x%04x", ctx->ip_offset));
|
|
if (ctx->eval.size >= 1 && stack_slot_get_type (stack_pop (ctx)) != TYPE_I4)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack item type is not an int32 for endfilter at 0x%04x", ctx->ip_offset));
|
}
|
|
if ((clause = is_correct_endfilter (ctx, ctx->ip_offset))) {
|
if (IS_STRICT_MODE (ctx)) {
|
if (ctx->ip_offset != clause->handler_offset - 2)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
|
} else {
|
if ((ctx->ip_offset != clause->handler_offset - 2) && !MONO_OFFSET_IN_HANDLER (clause, ctx->ip_offset))
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
|
}
|
} else {
|
if (IS_STRICT_MODE (ctx) && !is_unverifiable_endfilter (ctx, ctx->ip_offset))
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
|
else
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
|
}
|
|
ctx->eval.size = 0;
|
}
|
|
static void
|
do_leave (VerifyContext *ctx, int delta)
|
{
|
int target = ((gint32)ctx->ip_offset) + delta;
|
if (target >= ctx->code_size || target < 0)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
|
|
if (!is_correct_leave (ctx->header, ctx->ip_offset, target))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Leave not allowed in finally block at 0x%04x", ctx->ip_offset));
|
ctx->eval.size = 0;
|
ctx->target = target;
|
}
|
|
/*
|
* do_static_branch:
|
*
|
* Verify br and br.s opcodes.
|
*/
|
static void
|
do_static_branch (VerifyContext *ctx, int delta)
|
{
|
int target = ctx->ip_offset + delta;
|
if (target < 0 || target >= ctx->code_size) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("branch target out of code at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
|
case 1:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
break;
|
case 2:
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
|
break;
|
}
|
|
ctx->target = target;
|
}
|
|
static void
|
do_switch (VerifyContext *ctx, int count, const unsigned char *data)
|
{
|
int i, base = ctx->ip_offset + 5 + count * 4;
|
ILStackDesc *value;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
value = stack_pop (ctx);
|
|
if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to switch at 0x%04x", ctx->ip_offset));
|
|
for (i = 0; i < count; ++i) {
|
int target = base + read32 (data + i * 4);
|
|
if (target < 0 || target >= ctx->code_size) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x out of code at 0x%04x", i, ctx->ip_offset));
|
return;
|
}
|
|
switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
|
case 1:
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
|
break;
|
case 2:
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
|
return;
|
}
|
merge_stacks (ctx, &ctx->eval, &ctx->code [target], FALSE, TRUE);
|
}
|
}
|
|
static void
|
do_load_function_ptr (VerifyContext *ctx, guint32 token, gboolean virtual_)
|
{
|
ILStackDesc *top;
|
MonoMethod *method;
|
|
if (virtual_ && !check_underflow (ctx, 1))
|
return;
|
|
if (!virtual_ && !check_overflow (ctx))
|
return;
|
|
if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
|
method = (MonoMethod *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
|
if (!method) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return;
|
}
|
} else {
|
if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return;
|
}
|
|
if (!(method = verifier_load_method (ctx, token, virtual_ ? "ldvirtfrn" : "ldftn")))
|
return;
|
}
|
|
if (mono_method_is_constructor (method))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldftn with a constructor at 0x%04x", ctx->ip_offset));
|
|
if (virtual_) {
|
ILStackDesc *top = stack_pop (ctx);
|
|
if (stack_slot_get_type (top) != TYPE_COMPLEX || top->type->type == MONO_TYPE_VALUETYPE)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to ldvirtftn at 0x%04x", ctx->ip_offset));
|
|
if (method->flags & METHOD_ATTRIBUTE_STATIC)
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldvirtftn with a constructor at 0x%04x", ctx->ip_offset));
|
|
if (!verify_stack_type_compatibility (ctx, &method->klass->byval_arg, top))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unexpected object for ldvirtftn at 0x%04x", ctx->ip_offset));
|
}
|
|
if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL))
|
CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Loaded method is not visible for ldftn/ldvirtftn at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
|
|
top = stack_push_val(ctx, TYPE_PTR, mono_type_create_fnptr_from_mono_method (ctx, method));
|
top->method = method;
|
}
|
|
static void
|
do_sizeof (VerifyContext *ctx, int token)
|
{
|
MonoType *type;
|
|
if (!(type = verifier_load_type (ctx, token, "sizeof")))
|
return;
|
|
if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (type->type == MONO_TYPE_VOID) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (check_overflow (ctx))
|
set_stack_value (ctx, stack_push (ctx), &mono_defaults.uint32_class->byval_arg, FALSE);
|
}
|
|
/* Stack top can be of any type, the runtime doesn't care and treat everything as an int. */
|
static void
|
do_localloc (VerifyContext *ctx)
|
{
|
if (ctx->eval.size != 1) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
if (in_any_exception_block (ctx->header, ctx->ip_offset)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
|
return;
|
}
|
|
/*TODO verify top type*/
|
/* top = */ stack_pop (ctx);
|
|
set_stack_value (ctx, stack_push (ctx), &mono_defaults.int_class->byval_arg, FALSE);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Instruction localloc in never verifiable at 0x%04x", ctx->ip_offset));
|
}
|
|
static void
|
do_ldstr (VerifyContext *ctx, guint32 token)
|
{
|
GSList *error = NULL;
|
if (ctx->method->wrapper_type == MONO_WRAPPER_NONE && !image_is_dynamic (ctx->image)) {
|
if (mono_metadata_token_code (token) != MONO_TOKEN_STRING) {
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string token %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return;
|
}
|
|
if (!mono_verifier_verify_string_signature (ctx->image, mono_metadata_token_index (token), &error)) {
|
if (error)
|
ctx->list = g_slist_concat (ctx->list, error);
|
ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string index %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
|
return;
|
}
|
}
|
|
if (check_overflow (ctx))
|
stack_push_val (ctx, TYPE_COMPLEX, &mono_defaults.string_class->byval_arg);
|
}
|
|
static void
|
do_refanyval (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *top;
|
MonoType *type;
|
if (!check_underflow (ctx, 1))
|
return;
|
|
if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
|
return;
|
|
top = stack_pop (ctx);
|
|
if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanyval, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
|
|
set_stack_value (ctx, stack_push (ctx), type, TRUE);
|
}
|
|
static void
|
do_refanytype (VerifyContext *ctx)
|
{
|
ILStackDesc *top;
|
|
if (!check_underflow (ctx, 1))
|
return;
|
|
top = stack_pop (ctx);
|
|
if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanytype, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
|
|
set_stack_value (ctx, stack_push (ctx), &mono_defaults.typehandle_class->byval_arg, FALSE);
|
|
}
|
|
static void
|
do_mkrefany (VerifyContext *ctx, int token)
|
{
|
ILStackDesc *top;
|
MonoType *type;
|
if (!check_underflow (ctx, 1))
|
return;
|
|
if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
|
return;
|
|
top = stack_pop (ctx);
|
|
if (stack_slot_is_managed_mutability_pointer (top))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with mkrefany at 0x%04x", ctx->ip_offset));
|
|
if (!stack_slot_is_managed_pointer (top)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a managed pointer for mkrefany, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
|
}else {
|
MonoType *stack_type = mono_type_get_type_byval (top->type);
|
if (MONO_TYPE_IS_REFERENCE (type) && !mono_metadata_type_equal (type, stack_type))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
|
|
if (!MONO_TYPE_IS_REFERENCE (type) && !verify_type_compatibility_full (ctx, type, stack_type, TRUE))
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
|
}
|
|
set_stack_value (ctx, stack_push (ctx), &mono_defaults.typed_reference_class->byval_arg, FALSE);
|
}
|
|
static void
|
do_ckfinite (VerifyContext *ctx)
|
{
|
ILStackDesc *top;
|
if (!check_underflow (ctx, 1))
|
return;
|
|
top = stack_pop (ctx);
|
|
if (stack_slot_get_underlying_type (top) != TYPE_R8)
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected float32 or float64 on stack for ckfinit but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
|
stack_push_stack_val (ctx, top);
|
}
|
/*
|
* merge_stacks:
|
* Merge the stacks and perform compat checks. The merge check if types of @from are mergeable with type of @to
|
*
|
* @from holds new values for a given control path
|
* @to holds the current values of a given control path
|
*
|
* TODO we can eliminate the from argument as all callers pass &ctx->eval
|
*/
|
static void
|
merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external)
|
{
|
MonoError error;
|
int i, j;
|
stack_init (ctx, to);
|
|
if (start) {
|
if (to->flags == IL_CODE_FLAG_NOT_PROCESSED)
|
from->size = 0;
|
else
|
stack_copy (&ctx->eval, to);
|
goto end_verify;
|
} else if (!(to->flags & IL_CODE_STACK_MERGED)) {
|
stack_copy (to, &ctx->eval);
|
goto end_verify;
|
}
|
VERIFIER_DEBUG ( printf ("performing stack merge %d x %d\n", from->size, to->size); );
|
|
if (from->size != to->size) {
|
VERIFIER_DEBUG ( printf ("different stack sizes %d x %d at 0x%04x\n", from->size, to->size, ctx->ip_offset); );
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not merge stacks, different sizes (%d x %d) at 0x%04x", from->size, to->size, ctx->ip_offset));
|
goto end_verify;
|
}
|
|
//FIXME we need to preserve CMMP attributes
|
//FIXME we must take null literals into consideration.
|
for (i = 0; i < from->size; ++i) {
|
ILStackDesc *new_slot = from->stack + i;
|
ILStackDesc *old_slot = to->stack + i;
|
MonoType *new_type = mono_type_from_stack_slot (new_slot);
|
MonoType *old_type = mono_type_from_stack_slot (old_slot);
|
MonoClass *old_class = mono_class_from_mono_type (old_type);
|
MonoClass *new_class = mono_class_from_mono_type (new_type);
|
MonoClass *match_class = NULL;
|
|
// check for safe byref before the next steps override new_slot
|
if (stack_slot_is_safe_byref (old_slot) ^ stack_slot_is_safe_byref (new_slot)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stack at depth %d byref types are safe byref incompatible at %0x04x ", i, ctx->ip_offset));
|
goto end_verify;
|
}
|
|
// S := T then U = S (new value is compatible with current value, keep current)
|
if (verify_stack_type_compatibility (ctx, old_type, new_slot)) {
|
copy_stack_value (new_slot, old_slot);
|
continue;
|
}
|
|
// T := S then U = T (old value is compatible with current value, use new)
|
if (verify_stack_type_compatibility (ctx, new_type, old_slot)) {
|
copy_stack_value (old_slot, new_slot);
|
continue;
|
}
|
|
/*Both slots are the same boxed valuetype. Simply copy it.*/
|
if (stack_slot_is_boxed_value (old_slot) &&
|
stack_slot_is_boxed_value (new_slot) &&
|
mono_metadata_type_equal (old_type, new_type)) {
|
copy_stack_value (new_slot, old_slot);
|
continue;
|
}
|
|
if (mono_type_is_generic_argument (old_type) || mono_type_is_generic_argument (new_type)) {
|
char *old_name = stack_slot_full_name (old_slot);
|
char *new_name = stack_slot_full_name (new_slot);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
|
g_free (old_name);
|
g_free (new_name);
|
goto end_verify;
|
}
|
|
//both are reference types, use closest common super type
|
if (!mono_class_from_mono_type (old_type)->valuetype
|
&& !mono_class_from_mono_type (new_type)->valuetype
|
&& !stack_slot_is_managed_pointer (old_slot)
|
&& !stack_slot_is_managed_pointer (new_slot)) {
|
|
mono_class_setup_supertypes (old_class);
|
mono_class_setup_supertypes (new_class);
|
|
for (j = MIN (old_class->idepth, new_class->idepth) - 1; j > 0; --j) {
|
if (mono_metadata_type_equal (&old_class->supertypes [j]->byval_arg, &new_class->supertypes [j]->byval_arg)) {
|
match_class = old_class->supertypes [j];
|
goto match_found;
|
}
|
}
|
|
mono_class_setup_interfaces (old_class, &error);
|
if (!mono_error_ok (&error)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stacks due to a TypeLoadException %s at 0x%04x", mono_error_get_message (&error), ctx->ip_offset));
|
mono_error_cleanup (&error);
|
goto end_verify;
|
}
|
mono_class_setup_interfaces (new_class, &error);
|
if (!mono_error_ok (&error)) {
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stacks due to a TypeLoadException %s at 0x%04x", mono_error_get_message (&error), ctx->ip_offset));
|
mono_error_cleanup (&error);
|
goto end_verify;
|
}
|
|
/* if old class is an interface that new class implements */
|
if (mono_class_is_interface (old_class)) {
|
if (verifier_class_is_assignable_from (old_class, new_class)) {
|
match_class = old_class;
|
goto match_found;
|
}
|
for (j = 0; j < old_class->interface_count; ++j) {
|
if (verifier_class_is_assignable_from (old_class->interfaces [j], new_class)) {
|
match_class = old_class->interfaces [j];
|
goto match_found;
|
}
|
}
|
}
|
|
if (mono_class_is_interface (new_class)) {
|
if (verifier_class_is_assignable_from (new_class, old_class)) {
|
match_class = new_class;
|
goto match_found;
|
}
|
for (j = 0; j < new_class->interface_count; ++j) {
|
if (verifier_class_is_assignable_from (new_class->interfaces [j], old_class)) {
|
match_class = new_class->interfaces [j];
|
goto match_found;
|
}
|
}
|
}
|
|
//No decent super type found, use object
|
match_class = mono_defaults.object_class;
|
goto match_found;
|
} else if (is_compatible_boxed_valuetype (ctx,old_type, new_type, new_slot, FALSE) || is_compatible_boxed_valuetype (ctx, new_type, old_type, old_slot, FALSE)) {
|
match_class = mono_defaults.object_class;
|
goto match_found;
|
}
|
|
{
|
char *old_name = stack_slot_full_name (old_slot);
|
char *new_name = stack_slot_full_name (new_slot);
|
CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
|
g_free (old_name);
|
g_free (new_name);
|
}
|
set_stack_value (ctx, old_slot, &new_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
|
goto end_verify;
|
|
match_found:
|
g_assert (match_class);
|
set_stack_value (ctx, old_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
|
set_stack_value (ctx, new_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
|
continue;
|
}
|
|
end_verify:
|
if (external)
|
to->flags |= IL_CODE_FLAG_WAS_TARGET;
|
to->flags |= IL_CODE_STACK_MERGED;
|
}
|
|
#define HANDLER_START(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER ? (clause)->data.filter_offset : clause->handler_offset)
|
#define IS_CATCH_OR_FILTER(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER || (clause)->flags == MONO_EXCEPTION_CLAUSE_NONE)
|
|
/**
|
* is_clause_in_range :
|
*
|
* Returns TRUE if either the protected block or the handler of @clause is in the @start - @end range.
|
*/
|
static gboolean
|
is_clause_in_range (MonoExceptionClause *clause, guint32 start, guint32 end)
|
{
|
if (clause->try_offset >= start && clause->try_offset < end)
|
return TRUE;
|
if (HANDLER_START (clause) >= start && HANDLER_START (clause) < end)
|
return TRUE;
|
return FALSE;
|
}
|
|
/**
|
* is_clause_inside_range :
|
*
|
* Returns TRUE if @clause lies completely inside the @start - @end range.
|
*/
|
static gboolean
|
is_clause_inside_range (MonoExceptionClause *clause, guint32 start, guint32 end)
|
{
|
if (clause->try_offset < start || (clause->try_offset + clause->try_len) > end)
|
return FALSE;
|
if (HANDLER_START (clause) < start || (clause->handler_offset + clause->handler_len) > end)
|
return FALSE;
|
return TRUE;
|
}
|
|
/**
|
* is_clause_nested :
|
*
|
* Returns TRUE if @nested is nested in @clause.
|
*/
|
static gboolean
|
is_clause_nested (MonoExceptionClause *clause, MonoExceptionClause *nested)
|
{
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (nested, clause->data.filter_offset, clause->handler_offset))
|
return TRUE;
|
return is_clause_inside_range (nested, clause->try_offset, clause->try_offset + clause->try_len) ||
|
is_clause_inside_range (nested, clause->handler_offset, clause->handler_offset + clause->handler_len);
|
}
|
|
/* Test the relationship between 2 exception clauses. Follow P.1 12.4.2.7 of ECMA
|
* the each pair of exception must have the following properties:
|
* - one is fully nested on another (the outer must not be a filter clause) (the nested one must come earlier)
|
* - completely disjoin (none of the 3 regions of each entry overlap with the other 3)
|
* - mutual protection (protected block is EXACT the same, handlers are disjoin and all handler are catch or all handler are filter)
|
*/
|
static void
|
verify_clause_relationship (VerifyContext *ctx, MonoExceptionClause *clause, MonoExceptionClause *to_test)
|
{
|
/*clause is nested*/
|
if (to_test->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (clause, to_test->data.filter_offset, to_test->handler_offset)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clause inside filter"));
|
return;
|
}
|
|
/*wrong nesting order.*/
|
if (is_clause_nested (clause, to_test)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Nested exception clause appears after enclosing clause"));
|
return;
|
}
|
|
/*mutual protection*/
|
if (clause->try_offset == to_test->try_offset && clause->try_len == to_test->try_len) {
|
/*handlers are not disjoint*/
|
if (is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception handlers overlap"));
|
return;
|
}
|
/* handlers are not catch or filter */
|
if (!IS_CATCH_OR_FILTER (clause) || !IS_CATCH_OR_FILTER (to_test)) {
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses with shared protected block are neither catch or filter"));
|
return;
|
}
|
/*OK*/
|
return;
|
}
|
|
/*not completelly disjoint*/
|
if ((is_clause_in_range (to_test, clause->try_offset, clause->try_offset + clause->try_len) ||
|
is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) && !is_clause_nested (to_test, clause))
|
ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses overlap"));
|
}
|
|
#define code_bounds_check(size) \
|
if (ADDP_IS_GREATER_OR_OVF (ip, size, end)) {\
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Code overrun starting with 0x%x at 0x%04x", *ip, ctx.ip_offset)); \
|
break; \
|
} \
|
|
static gboolean
|
mono_opcode_is_prefix (int op)
|
{
|
switch (op) {
|
case MONO_CEE_UNALIGNED_:
|
case MONO_CEE_VOLATILE_:
|
case MONO_CEE_TAIL_:
|
case MONO_CEE_CONSTRAINED_:
|
case MONO_CEE_READONLY_:
|
return TRUE;
|
}
|
return FALSE;
|
}
|
|
/*
|
* FIXME: need to distinguish between valid and verifiable.
|
* Need to keep track of types on the stack.
|
*/
|
|
/**
|
* mono_method_verify:
|
* Verify types for opcodes.
|
*/
|
GSList*
|
mono_method_verify (MonoMethod *method, int level)
|
{
|
MonoError error;
|
const unsigned char *ip, *code_start;
|
const unsigned char *end;
|
MonoSimpleBasicBlock *bb = NULL, *original_bb = NULL;
|
|
int i, n, need_merge = 0, start = 0;
|
guint ip_offset = 0, prefix = 0;
|
MonoGenericContext *generic_context = NULL;
|
MonoImage *image;
|
VerifyContext ctx;
|
GSList *tmp;
|
VERIFIER_DEBUG ( printf ("Verify IL for method %s %s %s\n", method->klass->name_space, method->klass->name, method->name); );
|
|
init_verifier_stats ();
|
|
if (method->iflags & (METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL | METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
|
(method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))) {
|
return NULL;
|
}
|
|
memset (&ctx, 0, sizeof (VerifyContext));
|
|
//FIXME use mono_method_get_signature_full
|
ctx.signature = mono_method_signature (method);
|
if (!ctx.signature) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method signature"));
|
|
finish_collect_stats ();
|
return ctx.list;
|
}
|
if (!method->is_generic && !mono_class_is_gtd (method->klass) && ctx.signature->has_type_parameters) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Method and signature don't match in terms of genericity"));
|
finish_collect_stats ();
|
return ctx.list;
|
}
|
|
ctx.header = mono_method_get_header_checked (method, &error);
|
if (!ctx.header) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method header due to %s", mono_error_get_message (&error)));
|
mono_error_cleanup (&error);
|
finish_collect_stats ();
|
return ctx.list;
|
}
|
ctx.method = method;
|
code_start = ip = ctx.header->code;
|
end = ip + ctx.header->code_size;
|
ctx.image = image = method->klass->image;
|
|
|
ctx.max_args = ctx.signature->param_count + ctx.signature->hasthis;
|
ctx.max_stack = ctx.header->max_stack;
|
ctx.verifiable = ctx.valid = 1;
|
ctx.level = level;
|
|
ctx.code = g_new (ILCodeDesc, ctx.header->code_size);
|
ctx.code_size = ctx.header->code_size;
|
_MEM_ALLOC (sizeof (ILCodeDesc) * ctx.header->code_size);
|
|
memset(ctx.code, 0, sizeof (ILCodeDesc) * ctx.header->code_size);
|
|
ctx.num_locals = ctx.header->num_locals;
|
ctx.locals = (MonoType **)g_memdup (ctx.header->locals, sizeof (MonoType*) * ctx.header->num_locals);
|
_MEM_ALLOC (sizeof (MonoType*) * ctx.header->num_locals);
|
ctx.locals_verification_state = g_new0 (char, ctx.num_locals);
|
|
if (ctx.num_locals > 0 && !ctx.header->init_locals)
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Method with locals variable but without init locals set"));
|
|
ctx.params = g_new (MonoType*, ctx.max_args);
|
_MEM_ALLOC (sizeof (MonoType*) * ctx.max_args);
|
|
if (ctx.signature->hasthis)
|
ctx.params [0] = method->klass->valuetype ? &method->klass->this_arg : &method->klass->byval_arg;
|
memcpy (ctx.params + ctx.signature->hasthis, ctx.signature->params, sizeof (MonoType *) * ctx.signature->param_count);
|
|
if (ctx.signature->is_inflated)
|
ctx.generic_context = generic_context = mono_method_get_context (method);
|
|
if (!generic_context && (mono_class_is_gtd (method->klass) || method->is_generic)) {
|
if (method->is_generic)
|
ctx.generic_context = generic_context = &(mono_method_get_generic_container (method)->context);
|
else
|
ctx.generic_context = generic_context = &mono_class_get_generic_container (method->klass)->context;
|
}
|
|
for (i = 0; i < ctx.num_locals; ++i) {
|
MonoType *uninflated = ctx.locals [i];
|
ctx.locals [i] = mono_class_inflate_generic_type_checked (ctx.locals [i], ctx.generic_context, &error);
|
if (!mono_error_ok (&error)) {
|
char *name = mono_type_full_name (ctx.locals [i] ? ctx.locals [i] : uninflated);
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %d of type %s", i, name));
|
g_free (name);
|
mono_error_cleanup (&error);
|
/* we must not free (in cleanup) what was not yet allocated (but only copied) */
|
ctx.num_locals = i;
|
ctx.max_args = 0;
|
goto cleanup;
|
}
|
}
|
for (i = 0; i < ctx.max_args; ++i) {
|
MonoType *uninflated = ctx.params [i];
|
ctx.params [i] = mono_class_inflate_generic_type_checked (ctx.params [i], ctx.generic_context, &error);
|
if (!mono_error_ok (&error)) {
|
char *name = mono_type_full_name (ctx.params [i] ? ctx.params [i] : uninflated);
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %d of type %s", i, name));
|
g_free (name);
|
mono_error_cleanup (&error);
|
/* we must not free (in cleanup) what was not yet allocated (but only copied) */
|
ctx.max_args = i;
|
goto cleanup;
|
}
|
}
|
stack_init (&ctx, &ctx.eval);
|
|
for (i = 0; i < ctx.num_locals; ++i) {
|
if (!mono_type_is_valid_in_context (&ctx, ctx.locals [i]))
|
break;
|
if (get_stack_type (ctx.locals [i]) == TYPE_INV) {
|
char *name = mono_type_full_name (ctx.locals [i]);
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %i of type %s", i, name));
|
g_free (name);
|
break;
|
}
|
|
}
|
|
for (i = 0; i < ctx.max_args; ++i) {
|
if (!mono_type_is_valid_in_context (&ctx, ctx.params [i]))
|
break;
|
|
if (get_stack_type (ctx.params [i]) == TYPE_INV) {
|
char *name = mono_type_full_name (ctx.params [i]);
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %i of type %s", i, name));
|
g_free (name);
|
break;
|
}
|
}
|
|
if (!ctx.valid)
|
goto cleanup;
|
|
for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
|
MonoExceptionClause *clause = ctx.header->clauses + i;
|
VERIFIER_DEBUG (printf ("clause try %x len %x filter at %x handler at %x len %x\n", clause->try_offset, clause->try_len, clause->data.filter_offset, clause->handler_offset, clause->handler_len); );
|
|
if (clause->try_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, ctx.code_size))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause out of bounds at 0x%04x", clause->try_offset));
|
|
if (clause->try_len <= 0)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause len <= 0 at 0x%04x", clause->try_offset));
|
|
if (clause->handler_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->handler_offset, clause->handler_len, ctx.code_size))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause out of bounds at 0x%04x", clause->try_offset));
|
|
if (clause->handler_len <= 0)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause len <= 0 at 0x%04x", clause->try_offset));
|
|
if (clause->try_offset < clause->handler_offset && ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, HANDLER_START (clause)))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try block (at 0x%04x) includes handler block (at 0x%04x)", clause->try_offset, clause->handler_offset));
|
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
|
if (clause->data.filter_offset > ctx.code_size)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause out of bounds at 0x%04x", clause->try_offset));
|
|
if (clause->data.filter_offset >= clause->handler_offset)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause must come before the handler clause at 0x%04x", clause->data.filter_offset));
|
}
|
|
for (n = i + 1; n < ctx.header->num_clauses && ctx.valid; ++n)
|
verify_clause_relationship (&ctx, clause, ctx.header->clauses + n);
|
|
if (!ctx.valid)
|
break;
|
|
ctx.code [clause->try_offset].flags |= IL_CODE_FLAG_WAS_TARGET;
|
if (clause->try_offset + clause->try_len < ctx.code_size)
|
ctx.code [clause->try_offset + clause->try_len].flags |= IL_CODE_FLAG_WAS_TARGET;
|
if (clause->handler_offset + clause->handler_len < ctx.code_size)
|
ctx.code [clause->handler_offset + clause->handler_len].flags |= IL_CODE_FLAG_WAS_TARGET;
|
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_NONE) {
|
if (!clause->data.catch_class) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Catch clause %d with invalid type", i));
|
break;
|
}
|
if (!mono_type_is_valid_in_context (&ctx, &clause->data.catch_class->byval_arg))
|
break;
|
|
init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, clause->data.catch_class);
|
}
|
else if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
|
init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->data.filter_offset, mono_defaults.exception_class);
|
init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, mono_defaults.exception_class);
|
}
|
}
|
|
if (!ctx.valid)
|
goto cleanup;
|
|
original_bb = bb = mono_basic_block_split (method, &error, ctx.header);
|
if (!mono_error_ok (&error)) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid branch target: %s", mono_error_get_message (&error)));
|
mono_error_cleanup (&error);
|
goto cleanup;
|
}
|
g_assert (bb);
|
|
while (ip < end && ctx.valid) {
|
int op_size;
|
ip_offset = (guint) (ip - code_start);
|
{
|
const unsigned char *ip_copy = ip;
|
int op;
|
|
if (ip_offset > bb->end) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block at [0x%04x] targets middle instruction at 0x%04x", bb->end, ip_offset));
|
goto cleanup;
|
}
|
|
if (ip_offset == bb->end)
|
bb = bb->next;
|
|
op_size = mono_opcode_value_and_size (&ip_copy, end, &op);
|
if (op_size == -1) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ip_offset));
|
goto cleanup;
|
}
|
|
if (ADD_IS_GREATER_OR_OVF (ip_offset, op_size, bb->end)) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block targets middle of instruction at 0x%04x", ip_offset));
|
goto cleanup;
|
}
|
|
/*Last Instruction*/
|
if (ip_offset + op_size == bb->end && mono_opcode_is_prefix (op)) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block targets between prefix '%s' and instruction at 0x%04x", mono_opcode_name (op), ip_offset));
|
goto cleanup;
|
}
|
}
|
|
ctx.ip_offset = ip_offset = (guint) (ip - code_start);
|
|
/*We need to check against fallthrou in and out of protected blocks.
|
* For fallout we check the once a protected block ends, if the start flag is not set.
|
* Likewise for fallthru in, we check if ip is the start of a protected block and start is not set
|
* TODO convert these checks to be done using flags and not this loop
|
*/
|
for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
|
MonoExceptionClause *clause = ctx.header->clauses + i;
|
|
if ((clause->try_offset + clause->try_len == ip_offset) && start == 0) {
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru off try block at 0x%04x", ip_offset));
|
start = 1;
|
}
|
|
if ((clause->handler_offset + clause->handler_len == ip_offset) && start == 0) {
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
|
else
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
|
start = 1;
|
}
|
|
if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && clause->handler_offset == ip_offset && start == 0) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of filter block at 0x%04x", ip_offset));
|
start = 1;
|
}
|
|
if (clause->handler_offset == ip_offset && start == 0) {
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru handler block at 0x%04x", ip_offset));
|
start = 1;
|
}
|
|
if (clause->try_offset == ip_offset && ctx.eval.size > 0 && start == 0) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Try to enter try block with a non-empty stack at 0x%04x", ip_offset));
|
start = 1;
|
}
|
}
|
|
/*This must be done after fallthru detection otherwise it won't happen.*/
|
if (bb->dead) {
|
/*FIXME remove this once we move all bad branch checking code to use BB only*/
|
ctx.code [ip_offset].flags |= IL_CODE_FLAG_SEEN;
|
ip += op_size;
|
continue;
|
}
|
|
if (!ctx.valid)
|
break;
|
|
if (need_merge) {
|
VERIFIER_DEBUG ( printf ("extra merge needed! 0x%04x \n", ctx.target); );
|
merge_stacks (&ctx, &ctx.eval, &ctx.code [ctx.target], FALSE, TRUE);
|
need_merge = 0;
|
}
|
merge_stacks (&ctx, &ctx.eval, &ctx.code[ip_offset], start, FALSE);
|
start = 0;
|
|
/*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
|
#ifdef MONO_VERIFIER_DEBUG
|
{
|
char *discode;
|
discode = mono_disasm_code_one (NULL, method, ip, NULL);
|
discode [strlen (discode) - 1] = 0; /* no \n */
|
g_print ("[%d] %-29s (%d)\n", ip_offset, discode, ctx.eval.size);
|
g_free (discode);
|
}
|
dump_stack_state (&ctx.code [ip_offset]);
|
dump_stack_state (&ctx.eval);
|
#endif
|
|
switch (*ip) {
|
case CEE_NOP:
|
case CEE_BREAK:
|
++ip;
|
break;
|
|
case CEE_LDARG_0:
|
case CEE_LDARG_1:
|
case CEE_LDARG_2:
|
case CEE_LDARG_3:
|
push_arg (&ctx, *ip - CEE_LDARG_0, FALSE);
|
++ip;
|
break;
|
|
case CEE_LDARG_S:
|
case CEE_LDARGA_S:
|
code_bounds_check (2);
|
push_arg (&ctx, ip [1], *ip == CEE_LDARGA_S);
|
ip += 2;
|
break;
|
|
case CEE_ADD_OVF_UN:
|
do_binop (&ctx, *ip, add_ovf_un_table);
|
++ip;
|
break;
|
|
case CEE_SUB_OVF_UN:
|
do_binop (&ctx, *ip, sub_ovf_un_table);
|
++ip;
|
break;
|
|
case CEE_ADD_OVF:
|
case CEE_SUB_OVF:
|
case CEE_MUL_OVF:
|
case CEE_MUL_OVF_UN:
|
do_binop (&ctx, *ip, bin_ovf_table);
|
++ip;
|
break;
|
|
case CEE_ADD:
|
do_binop (&ctx, *ip, add_table);
|
++ip;
|
break;
|
|
case CEE_SUB:
|
do_binop (&ctx, *ip, sub_table);
|
++ip;
|
break;
|
|
case CEE_MUL:
|
case CEE_DIV:
|
case CEE_REM:
|
do_binop (&ctx, *ip, bin_op_table);
|
++ip;
|
break;
|
|
case CEE_AND:
|
case CEE_DIV_UN:
|
case CEE_OR:
|
case CEE_REM_UN:
|
case CEE_XOR:
|
do_binop (&ctx, *ip, int_bin_op_table);
|
++ip;
|
break;
|
|
case CEE_SHL:
|
case CEE_SHR:
|
case CEE_SHR_UN:
|
do_binop (&ctx, *ip, shift_op_table);
|
++ip;
|
break;
|
|
case CEE_POP:
|
if (!check_underflow (&ctx, 1))
|
break;
|
stack_pop_safe (&ctx);
|
++ip;
|
break;
|
|
case CEE_RET:
|
do_ret (&ctx);
|
++ip;
|
start = 1;
|
break;
|
|
case CEE_LDLOC_0:
|
case CEE_LDLOC_1:
|
case CEE_LDLOC_2:
|
case CEE_LDLOC_3:
|
/*TODO support definite assignment verification? */
|
push_local (&ctx, *ip - CEE_LDLOC_0, FALSE);
|
++ip;
|
break;
|
|
case CEE_STLOC_0:
|
case CEE_STLOC_1:
|
case CEE_STLOC_2:
|
case CEE_STLOC_3:
|
store_local (&ctx, *ip - CEE_STLOC_0);
|
++ip;
|
break;
|
|
case CEE_STLOC_S:
|
code_bounds_check (2);
|
store_local (&ctx, ip [1]);
|
ip += 2;
|
break;
|
|
case CEE_STARG_S:
|
code_bounds_check (2);
|
store_arg (&ctx, ip [1]);
|
ip += 2;
|
break;
|
|
case CEE_LDC_I4_M1:
|
case CEE_LDC_I4_0:
|
case CEE_LDC_I4_1:
|
case CEE_LDC_I4_2:
|
case CEE_LDC_I4_3:
|
case CEE_LDC_I4_4:
|
case CEE_LDC_I4_5:
|
case CEE_LDC_I4_6:
|
case CEE_LDC_I4_7:
|
case CEE_LDC_I4_8:
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
++ip;
|
break;
|
|
case CEE_LDC_I4_S:
|
code_bounds_check (2);
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
ip += 2;
|
break;
|
|
case CEE_LDC_I4:
|
code_bounds_check (5);
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx,TYPE_I4, &mono_defaults.int32_class->byval_arg);
|
ip += 5;
|
break;
|
|
case CEE_LDC_I8:
|
code_bounds_check (9);
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
|
ip += 9;
|
break;
|
|
case CEE_LDC_R4:
|
code_bounds_check (5);
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
|
ip += 5;
|
break;
|
|
case CEE_LDC_R8:
|
code_bounds_check (9);
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
|
ip += 9;
|
break;
|
|
case CEE_LDNULL:
|
if (check_overflow (&ctx))
|
stack_push_val (&ctx, TYPE_COMPLEX | NULL_LITERAL_MASK, &mono_defaults.object_class->byval_arg);
|
++ip;
|
break;
|
|
case CEE_BEQ_S:
|
case CEE_BNE_UN_S:
|
code_bounds_check (2);
|
do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_eq_op);
|
ip += 2;
|
need_merge = 1;
|
break;
|
|
case CEE_BGE_S:
|
case CEE_BGT_S:
|
case CEE_BLE_S:
|
case CEE_BLT_S:
|
case CEE_BGE_UN_S:
|
case CEE_BGT_UN_S:
|
case CEE_BLE_UN_S:
|
case CEE_BLT_UN_S:
|
code_bounds_check (2);
|
do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_op);
|
ip += 2;
|
need_merge = 1;
|
break;
|
|
case CEE_BEQ:
|
case CEE_BNE_UN:
|
code_bounds_check (5);
|
do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_eq_op);
|
ip += 5;
|
need_merge = 1;
|
break;
|
|
case CEE_BGE:
|
case CEE_BGT:
|
case CEE_BLE:
|
case CEE_BLT:
|
case CEE_BGE_UN:
|
case CEE_BGT_UN:
|
case CEE_BLE_UN:
|
case CEE_BLT_UN:
|
code_bounds_check (5);
|
do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_op);
|
ip += 5;
|
need_merge = 1;
|
break;
|
|
case CEE_LDLOC_S:
|
case CEE_LDLOCA_S:
|
code_bounds_check (2);
|
push_local (&ctx, ip[1], *ip == CEE_LDLOCA_S);
|
ip += 2;
|
break;
|
|
case CEE_UNUSED99:
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
|
++ip;
|
break;
|
|
case CEE_DUP: {
|
ILStackDesc *top;
|
if (!check_underflow (&ctx, 1))
|
break;
|
if (!check_overflow (&ctx))
|
break;
|
top = stack_push (&ctx);
|
copy_stack_value (top, stack_peek (&ctx, 1));
|
++ip;
|
break;
|
}
|
|
case CEE_JMP:
|
code_bounds_check (5);
|
if (ctx.eval.size)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Eval stack must be empty in jmp at 0x%04x", ip_offset));
|
/* token = read32 (ip + 1); */
|
if (in_any_block (ctx.header, ip_offset))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("jmp cannot escape exception blocks at 0x%04x", ip_offset));
|
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction jmp is not verifiable at 0x%04x", ctx.ip_offset));
|
/*
|
* FIXME: check signature, retval, arguments etc.
|
*/
|
ip += 5;
|
break;
|
case CEE_CALL:
|
case CEE_CALLVIRT:
|
code_bounds_check (5);
|
do_invoke_method (&ctx, read32 (ip + 1), *ip == CEE_CALLVIRT);
|
ip += 5;
|
break;
|
|
case CEE_CALLI:
|
code_bounds_check (5);
|
/* token = read32 (ip + 1); */
|
/*
|
* FIXME: check signature, retval, arguments etc.
|
* FIXME: check requirements for tail call
|
*/
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction calli is not verifiable at 0x%04x", ctx.ip_offset));
|
ip += 5;
|
break;
|
case CEE_BR_S:
|
code_bounds_check (2);
|
do_static_branch (&ctx, (signed char)ip [1] + 2);
|
need_merge = 1;
|
ip += 2;
|
start = 1;
|
break;
|
|
case CEE_BRFALSE_S:
|
case CEE_BRTRUE_S:
|
code_bounds_check (2);
|
do_boolean_branch_op (&ctx, (signed char)ip [1] + 2);
|
ip += 2;
|
need_merge = 1;
|
break;
|
|
case CEE_BR:
|
code_bounds_check (5);
|
do_static_branch (&ctx, (gint32)read32 (ip + 1) + 5);
|
need_merge = 1;
|
ip += 5;
|
start = 1;
|
break;
|
|
case CEE_BRFALSE:
|
case CEE_BRTRUE:
|
code_bounds_check (5);
|
do_boolean_branch_op (&ctx, (gint32)read32 (ip + 1) + 5);
|
ip += 5;
|
need_merge = 1;
|
break;
|
|
case CEE_SWITCH: {
|
guint32 entries;
|
code_bounds_check (5);
|
entries = read32 (ip + 1);
|
|
if (entries > 0xFFFFFFFFU / sizeof (guint32))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Too many switch entries %x at 0x%04x", entries, ctx.ip_offset));
|
|
ip += 5;
|
code_bounds_check (sizeof (guint32) * entries);
|
|
do_switch (&ctx, entries, ip);
|
ip += sizeof (guint32) * entries;
|
break;
|
}
|
case CEE_LDIND_I1:
|
case CEE_LDIND_U1:
|
case CEE_LDIND_I2:
|
case CEE_LDIND_U2:
|
case CEE_LDIND_I4:
|
case CEE_LDIND_U4:
|
case CEE_LDIND_I8:
|
case CEE_LDIND_I:
|
case CEE_LDIND_R4:
|
case CEE_LDIND_R8:
|
case CEE_LDIND_REF:
|
do_load_indirect (&ctx, *ip);
|
++ip;
|
break;
|
|
case CEE_STIND_REF:
|
case CEE_STIND_I1:
|
case CEE_STIND_I2:
|
case CEE_STIND_I4:
|
case CEE_STIND_I8:
|
case CEE_STIND_R4:
|
case CEE_STIND_R8:
|
case CEE_STIND_I:
|
do_store_indirect (&ctx, *ip);
|
++ip;
|
break;
|
|
case CEE_NOT:
|
case CEE_NEG:
|
do_unary_math_op (&ctx, *ip);
|
++ip;
|
break;
|
|
case CEE_CONV_I1:
|
case CEE_CONV_I2:
|
case CEE_CONV_I4:
|
case CEE_CONV_U1:
|
case CEE_CONV_U2:
|
case CEE_CONV_U4:
|
do_conversion (&ctx, TYPE_I4);
|
++ip;
|
break;
|
|
case CEE_CONV_I8:
|
case CEE_CONV_U8:
|
do_conversion (&ctx, TYPE_I8);
|
++ip;
|
break;
|
|
case CEE_CONV_R4:
|
case CEE_CONV_R8:
|
case CEE_CONV_R_UN:
|
do_conversion (&ctx, TYPE_R8);
|
++ip;
|
break;
|
|
case CEE_CONV_I:
|
case CEE_CONV_U:
|
do_conversion (&ctx, TYPE_NATIVE_INT);
|
++ip;
|
break;
|
|
case CEE_CPOBJ:
|
code_bounds_check (5);
|
do_cpobj (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_LDOBJ:
|
code_bounds_check (5);
|
do_ldobj_value (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_LDSTR:
|
code_bounds_check (5);
|
do_ldstr (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_NEWOBJ:
|
code_bounds_check (5);
|
do_newobj (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_CASTCLASS:
|
case CEE_ISINST:
|
code_bounds_check (5);
|
do_cast (&ctx, read32 (ip + 1), *ip == CEE_CASTCLASS ? "castclass" : "isinst");
|
ip += 5;
|
break;
|
|
case CEE_UNUSED58:
|
case CEE_UNUSED1:
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
|
++ip;
|
break;
|
|
case CEE_UNBOX:
|
code_bounds_check (5);
|
do_unbox_value (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_THROW:
|
do_throw (&ctx);
|
start = 1;
|
++ip;
|
break;
|
|
case CEE_LDFLD:
|
case CEE_LDFLDA:
|
code_bounds_check (5);
|
do_push_field (&ctx, read32 (ip + 1), *ip == CEE_LDFLDA);
|
ip += 5;
|
break;
|
|
case CEE_LDSFLD:
|
case CEE_LDSFLDA:
|
code_bounds_check (5);
|
do_push_static_field (&ctx, read32 (ip + 1), *ip == CEE_LDSFLDA);
|
ip += 5;
|
break;
|
|
case CEE_STFLD:
|
code_bounds_check (5);
|
do_store_field (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_STSFLD:
|
code_bounds_check (5);
|
do_store_static_field (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_STOBJ:
|
code_bounds_check (5);
|
do_stobj (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_CONV_OVF_I1_UN:
|
case CEE_CONV_OVF_I2_UN:
|
case CEE_CONV_OVF_I4_UN:
|
case CEE_CONV_OVF_U1_UN:
|
case CEE_CONV_OVF_U2_UN:
|
case CEE_CONV_OVF_U4_UN:
|
do_conversion (&ctx, TYPE_I4);
|
++ip;
|
break;
|
|
case CEE_CONV_OVF_I8_UN:
|
case CEE_CONV_OVF_U8_UN:
|
do_conversion (&ctx, TYPE_I8);
|
++ip;
|
break;
|
|
case CEE_CONV_OVF_I_UN:
|
case CEE_CONV_OVF_U_UN:
|
do_conversion (&ctx, TYPE_NATIVE_INT);
|
++ip;
|
break;
|
|
case CEE_BOX:
|
code_bounds_check (5);
|
do_box_value (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_NEWARR:
|
code_bounds_check (5);
|
do_newarr (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_LDLEN:
|
do_ldlen (&ctx);
|
++ip;
|
break;
|
|
case CEE_LDELEMA:
|
code_bounds_check (5);
|
do_ldelema (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_LDELEM_I1:
|
case CEE_LDELEM_U1:
|
case CEE_LDELEM_I2:
|
case CEE_LDELEM_U2:
|
case CEE_LDELEM_I4:
|
case CEE_LDELEM_U4:
|
case CEE_LDELEM_I8:
|
case CEE_LDELEM_I:
|
case CEE_LDELEM_R4:
|
case CEE_LDELEM_R8:
|
case CEE_LDELEM_REF:
|
do_ldelem (&ctx, *ip, 0);
|
++ip;
|
break;
|
|
case CEE_STELEM_I:
|
case CEE_STELEM_I1:
|
case CEE_STELEM_I2:
|
case CEE_STELEM_I4:
|
case CEE_STELEM_I8:
|
case CEE_STELEM_R4:
|
case CEE_STELEM_R8:
|
case CEE_STELEM_REF:
|
do_stelem (&ctx, *ip, 0);
|
++ip;
|
break;
|
|
case CEE_LDELEM:
|
code_bounds_check (5);
|
do_ldelem (&ctx, *ip, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_STELEM:
|
code_bounds_check (5);
|
do_stelem (&ctx, *ip, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_UNBOX_ANY:
|
code_bounds_check (5);
|
do_unbox_any (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_CONV_OVF_I1:
|
case CEE_CONV_OVF_U1:
|
case CEE_CONV_OVF_I2:
|
case CEE_CONV_OVF_U2:
|
case CEE_CONV_OVF_I4:
|
case CEE_CONV_OVF_U4:
|
do_conversion (&ctx, TYPE_I4);
|
++ip;
|
break;
|
|
case CEE_CONV_OVF_I8:
|
case CEE_CONV_OVF_U8:
|
do_conversion (&ctx, TYPE_I8);
|
++ip;
|
break;
|
|
case CEE_CONV_OVF_I:
|
case CEE_CONV_OVF_U:
|
do_conversion (&ctx, TYPE_NATIVE_INT);
|
++ip;
|
break;
|
|
case CEE_REFANYVAL:
|
code_bounds_check (5);
|
do_refanyval (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_CKFINITE:
|
do_ckfinite (&ctx);
|
++ip;
|
break;
|
|
case CEE_MKREFANY:
|
code_bounds_check (5);
|
do_mkrefany (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_LDTOKEN:
|
code_bounds_check (5);
|
do_load_token (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_ENDFINALLY:
|
if (!is_correct_endfinally (ctx.header, ip_offset))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("endfinally must be used inside a finally/fault handler at 0x%04x", ctx.ip_offset));
|
ctx.eval.size = 0;
|
start = 1;
|
++ip;
|
break;
|
|
case CEE_LEAVE:
|
code_bounds_check (5);
|
do_leave (&ctx, read32 (ip + 1) + 5);
|
ip += 5;
|
start = 1;
|
need_merge = 1;
|
break;
|
|
case CEE_LEAVE_S:
|
code_bounds_check (2);
|
do_leave (&ctx, (signed char)ip [1] + 2);
|
ip += 2;
|
start = 1;
|
need_merge = 1;
|
break;
|
|
case CEE_PREFIX1:
|
code_bounds_check (2);
|
++ip;
|
switch (*ip) {
|
case CEE_STLOC:
|
code_bounds_check (3);
|
store_local (&ctx, read16 (ip + 1));
|
ip += 3;
|
break;
|
|
case CEE_CEQ:
|
do_cmp_op (&ctx, cmp_br_eq_op, *ip);
|
++ip;
|
break;
|
|
case CEE_CGT:
|
case CEE_CGT_UN:
|
case CEE_CLT:
|
case CEE_CLT_UN:
|
do_cmp_op (&ctx, cmp_br_op, *ip);
|
++ip;
|
break;
|
|
case CEE_STARG:
|
code_bounds_check (3);
|
store_arg (&ctx, read16 (ip + 1) );
|
ip += 3;
|
break;
|
|
|
case CEE_ARGLIST:
|
if (!check_overflow (&ctx))
|
break;
|
if (ctx.signature->call_convention != MONO_CALL_VARARG)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Cannot use arglist on method without VARGARG calling convention at 0x%04x", ctx.ip_offset));
|
set_stack_value (&ctx, stack_push (&ctx), &mono_defaults.argumenthandle_class->byval_arg, FALSE);
|
++ip;
|
break;
|
|
case CEE_LDFTN:
|
code_bounds_check (5);
|
do_load_function_ptr (&ctx, read32 (ip + 1), FALSE);
|
ip += 5;
|
break;
|
|
case CEE_LDVIRTFTN:
|
code_bounds_check (5);
|
do_load_function_ptr (&ctx, read32 (ip + 1), TRUE);
|
ip += 5;
|
break;
|
|
case CEE_LDARG:
|
case CEE_LDARGA:
|
code_bounds_check (3);
|
push_arg (&ctx, read16 (ip + 1), *ip == CEE_LDARGA);
|
ip += 3;
|
break;
|
|
case CEE_LDLOC:
|
case CEE_LDLOCA:
|
code_bounds_check (3);
|
push_local (&ctx, read16 (ip + 1), *ip == CEE_LDLOCA);
|
ip += 3;
|
break;
|
|
case CEE_LOCALLOC:
|
do_localloc (&ctx);
|
++ip;
|
break;
|
|
case CEE_UNUSED56:
|
case CEE_UNUSED57:
|
case CEE_UNUSED70:
|
case CEE_UNUSED:
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
|
++ip;
|
break;
|
case CEE_ENDFILTER:
|
do_endfilter (&ctx);
|
start = 1;
|
++ip;
|
break;
|
case CEE_UNALIGNED_:
|
code_bounds_check (2);
|
prefix |= PREFIX_UNALIGNED;
|
ip += 2;
|
break;
|
case CEE_VOLATILE_:
|
prefix |= PREFIX_VOLATILE;
|
++ip;
|
break;
|
case CEE_TAIL_:
|
prefix |= PREFIX_TAIL;
|
++ip;
|
if (ip < end && (*ip != CEE_CALL && *ip != CEE_CALLI && *ip != CEE_CALLVIRT))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("tail prefix must be used only with call opcodes at 0x%04x", ip_offset));
|
break;
|
|
case CEE_INITOBJ:
|
code_bounds_check (5);
|
do_initobj (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_CONSTRAINED_:
|
code_bounds_check (5);
|
ctx.constrained_type = get_boxable_mono_type (&ctx, read32 (ip + 1), "constrained.");
|
prefix |= PREFIX_CONSTRAINED;
|
ip += 5;
|
break;
|
|
case CEE_READONLY_:
|
prefix |= PREFIX_READONLY;
|
ip++;
|
break;
|
|
case CEE_CPBLK:
|
CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
if (!check_underflow (&ctx, 3))
|
break;
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction cpblk is not verifiable at 0x%04x", ctx.ip_offset));
|
ip++;
|
break;
|
|
case CEE_INITBLK:
|
CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
|
if (!check_underflow (&ctx, 3))
|
break;
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction initblk is not verifiable at 0x%04x", ctx.ip_offset));
|
ip++;
|
break;
|
|
case CEE_NO_:
|
ip += 2;
|
break;
|
case CEE_RETHROW:
|
if (!is_correct_rethrow (ctx.header, ip_offset))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("rethrow must be used inside a catch handler at 0x%04x", ctx.ip_offset));
|
ctx.eval.size = 0;
|
start = 1;
|
++ip;
|
break;
|
|
case CEE_SIZEOF:
|
code_bounds_check (5);
|
do_sizeof (&ctx, read32 (ip + 1));
|
ip += 5;
|
break;
|
|
case CEE_REFANYTYPE:
|
do_refanytype (&ctx);
|
++ip;
|
break;
|
|
default:
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction FE %x at 0x%04x", *ip, ctx.ip_offset));
|
++ip;
|
}
|
break;
|
|
default:
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ctx.ip_offset));
|
++ip;
|
}
|
|
/*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
|
if (prefix) {
|
if (!ctx.prefix_set) //first prefix
|
ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
|
ctx.prefix_set |= prefix;
|
ctx.has_flags = TRUE;
|
prefix = 0;
|
} else {
|
if (!ctx.has_flags)
|
ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
|
|
if (ctx.prefix_set & PREFIX_CONSTRAINED)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after constrained prefix at 0x%04x", ctx.ip_offset));
|
if (ctx.prefix_set & PREFIX_READONLY)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after readonly prefix at 0x%04x", ctx.ip_offset));
|
if (ctx.prefix_set & PREFIX_VOLATILE)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after volatile prefix at 0x%04x", ctx.ip_offset));
|
if (ctx.prefix_set & PREFIX_UNALIGNED)
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after unaligned prefix at 0x%04x", ctx.ip_offset));
|
ctx.prefix_set = prefix = 0;
|
ctx.has_flags = FALSE;
|
}
|
}
|
/*
|
* if ip != end we overflowed: mark as error.
|
*/
|
if ((ip != end || !start) && ctx.verifiable && !ctx.list) {
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Run ahead of method code at 0x%04x", ip_offset));
|
}
|
|
/*We should guard against the last decoded opcode, otherwise we might add errors that doesn't make sense.*/
|
for (i = 0; i < ctx.code_size && i < ip_offset; ++i) {
|
if (ctx.code [i].flags & IL_CODE_FLAG_WAS_TARGET) {
|
if (!(ctx.code [i].flags & IL_CODE_FLAG_SEEN))
|
ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or exception block target middle of instruction at 0x%04x", i));
|
|
if (ctx.code [i].flags & IL_CODE_DELEGATE_SEQUENCE)
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Branch to delegate code sequence at 0x%04x", i));
|
}
|
if ((ctx.code [i].flags & IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL) && ctx.has_this_store)
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", i));
|
|
if ((ctx.code [i].flags & IL_CODE_CALL_NONFINAL_VIRTUAL) && ctx.has_this_store)
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid call to a non-final virtual function in method with stdarg.0 or ldarga.0 at 0x%04x", i));
|
}
|
|
if (mono_method_is_constructor (ctx.method) && !ctx.super_ctor_called && !ctx.method->klass->valuetype && ctx.method->klass != mono_defaults.object_class) {
|
char *method_name = mono_method_full_name (ctx.method, TRUE);
|
char *type = mono_type_get_full_name (ctx.method->klass);
|
if (ctx.method->klass->parent && mono_class_has_failure (ctx.method->klass->parent))
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor due to a TypeLoadException on base type.", method_name, type));
|
else
|
CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor.", method_name, type));
|
g_free (method_name);
|
g_free (type);
|
}
|
|
cleanup:
|
if (ctx.code) {
|
for (i = 0; i < ctx.header->code_size; ++i) {
|
if (ctx.code [i].stack)
|
g_free (ctx.code [i].stack);
|
}
|
}
|
|
for (tmp = ctx.funptrs; tmp; tmp = tmp->next)
|
g_free (tmp->data);
|
g_slist_free (ctx.funptrs);
|
|
for (tmp = ctx.exception_types; tmp; tmp = tmp->next)
|
mono_metadata_free_type ((MonoType *)tmp->data);
|
g_slist_free (ctx.exception_types);
|
|
for (i = 0; i < ctx.num_locals; ++i) {
|
if (ctx.locals [i])
|
mono_metadata_free_type (ctx.locals [i]);
|
}
|
for (i = 0; i < ctx.max_args; ++i) {
|
if (ctx.params [i])
|
mono_metadata_free_type (ctx.params [i]);
|
}
|
|
if (ctx.eval.stack)
|
g_free (ctx.eval.stack);
|
if (ctx.code)
|
g_free (ctx.code);
|
g_free (ctx.locals);
|
g_free (ctx.locals_verification_state);
|
g_free (ctx.params);
|
mono_basic_block_free (original_bb);
|
mono_metadata_free_mh (ctx.header);
|
|
finish_collect_stats ();
|
return ctx.list;
|
}
|
|
char*
|
mono_verify_corlib ()
|
{
|
/* This is a public API function so cannot be removed */
|
return NULL;
|
}
|
|
/**
|
* mono_verifier_is_enabled_for_method:
|
* \param method the method to probe
|
* \returns TRUE if \p method needs to be verified.
|
*/
|
gboolean
|
mono_verifier_is_enabled_for_method (MonoMethod *method)
|
{
|
return mono_verifier_is_enabled_for_class (method->klass) && (method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD);
|
}
|
|
/**
|
* mono_verifier_is_enabled_for_class:
|
* \param klass The \c MonoClass to probe
|
* \returns TRUE if \p klass need to be verified.
|
*/
|
gboolean
|
mono_verifier_is_enabled_for_class (MonoClass *klass)
|
{
|
return verify_all || (verifier_mode > MONO_VERIFIER_MODE_OFF && !(klass->image->assembly && klass->image->assembly->in_gac) && klass->image != mono_defaults.corlib);
|
}
|
|
gboolean
|
mono_verifier_is_enabled_for_image (MonoImage *image)
|
{
|
return verify_all || verifier_mode > MONO_VERIFIER_MODE_OFF;
|
}
|
|
/*
|
* Dynamic methods are not considered full trust since if the user is trusted and need to
|
* generate unsafe code, make the method skip verification - this is a known good way to do it.
|
*/
|
gboolean
|
mono_verifier_is_method_full_trust (MonoMethod *method)
|
{
|
return mono_verifier_is_class_full_trust (method->klass) && !method_is_dynamic (method);
|
}
|
|
/*
|
* Returns if @klass is under full trust or not.
|
*
|
* TODO This code doesn't take CAS into account.
|
*
|
* Under verify_all all user code must be verifiable if no security option was set
|
*
|
*/
|
gboolean
|
mono_verifier_is_class_full_trust (MonoClass *klass)
|
{
|
/* under CoreCLR code is trusted if it is part of the "platform" otherwise all code inside the GAC is trusted */
|
gboolean trusted_location = !mono_security_core_clr_enabled () ?
|
(klass->image->assembly && klass->image->assembly->in_gac) : mono_security_core_clr_is_platform_image (klass->image);
|
|
if (verify_all && verifier_mode == MONO_VERIFIER_MODE_OFF)
|
return trusted_location || klass->image == mono_defaults.corlib;
|
return verifier_mode < MONO_VERIFIER_MODE_VERIFIABLE || trusted_location || klass->image == mono_defaults.corlib;
|
}
|
|
GSList*
|
mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility, gboolean is_fulltrust)
|
{
|
return mono_method_verify (method,
|
(verifier_mode != MONO_VERIFIER_MODE_STRICT ? MONO_VERIFY_NON_STRICT: 0)
|
| (!is_fulltrust && !mono_verifier_is_method_full_trust (method) ? MONO_VERIFY_FAIL_FAST : 0)
|
| (skip_visibility ? MONO_VERIFY_SKIP_VISIBILITY : 0));
|
}
|
|
static int
|
get_field_end (MonoClassField *field)
|
{
|
int align;
|
int size = mono_type_size (field->type, &align);
|
if (size == 0)
|
size = 4; /*FIXME Is this a safe bet?*/
|
return size + field->offset;
|
}
|
|
static gboolean
|
verify_class_for_overlapping_reference_fields (MonoClass *klass)
|
{
|
int i = 0, j;
|
gpointer iter = NULL;
|
MonoClassField *field;
|
gboolean is_fulltrust = mono_verifier_is_class_full_trust (klass);
|
/*We can't skip types with !has_references since this is calculated after we have run.*/
|
if (!mono_class_is_explicit_layout (klass))
|
return TRUE;
|
|
|
/*We must check for stuff overlapping reference fields.
|
The outer loop uses mono_class_get_fields to ensure that MonoClass:fields get inited.
|
*/
|
while ((field = mono_class_get_fields (klass, &iter))) {
|
int fieldEnd = get_field_end (field);
|
gboolean is_valuetype = !MONO_TYPE_IS_REFERENCE (field->type);
|
++i;
|
|
if (mono_field_is_deleted (field) || (field->type->attrs & FIELD_ATTRIBUTE_STATIC))
|
continue;
|
|
int fcount = mono_class_get_field_count (klass);
|
for (j = i; j < fcount; ++j) {
|
MonoClassField *other = &klass->fields [j];
|
int otherEnd = get_field_end (other);
|
if (mono_field_is_deleted (other) || (is_valuetype && !MONO_TYPE_IS_REFERENCE (other->type)) || (other->type->attrs & FIELD_ATTRIBUTE_STATIC))
|
continue;
|
|
if (!is_valuetype && MONO_TYPE_IS_REFERENCE (other->type) && field->offset == other->offset && is_fulltrust)
|
continue;
|
|
if ((otherEnd > field->offset && otherEnd <= fieldEnd) || (other->offset >= field->offset && other->offset < fieldEnd))
|
return FALSE;
|
}
|
}
|
return TRUE;
|
}
|
|
static guint
|
field_hash (gconstpointer key)
|
{
|
const MonoClassField *field = (const MonoClassField *)key;
|
return g_str_hash (field->name) ^ mono_metadata_type_hash (field->type); /**/
|
}
|
|
static gboolean
|
field_equals (gconstpointer _a, gconstpointer _b)
|
{
|
const MonoClassField *a = (const MonoClassField *)_a;
|
const MonoClassField *b = (const MonoClassField *)_b;
|
return !strcmp (a->name, b->name) && mono_metadata_type_equal (a->type, b->type);
|
}
|
|
|
static gboolean
|
verify_class_fields (MonoClass *klass)
|
{
|
gpointer iter = NULL;
|
MonoClassField *field;
|
MonoGenericContext *context = mono_class_get_context (klass);
|
GHashTable *unique_fields = g_hash_table_new_full (&field_hash, &field_equals, NULL, NULL);
|
if (mono_class_is_gtd (klass))
|
context = &mono_class_get_generic_container (klass)->context;
|
|
while ((field = mono_class_get_fields (klass, &iter)) != NULL) {
|
if (!mono_type_is_valid_type_in_context (field->type, context)) {
|
g_hash_table_destroy (unique_fields);
|
return FALSE;
|
}
|
if (g_hash_table_lookup (unique_fields, field)) {
|
g_hash_table_destroy (unique_fields);
|
return FALSE;
|
}
|
g_hash_table_insert (unique_fields, field, field);
|
}
|
g_hash_table_destroy (unique_fields);
|
return TRUE;
|
}
|
|
static gboolean
|
verify_interfaces (MonoClass *klass)
|
{
|
int i;
|
for (i = 0; i < klass->interface_count; ++i) {
|
MonoClass *iface = klass->interfaces [i];
|
if (!mono_class_get_flags (iface))
|
return FALSE;
|
}
|
return TRUE;
|
}
|
|
static gboolean
|
verify_valuetype_layout_with_target (MonoClass *klass, MonoClass *target_class)
|
{
|
int type;
|
gpointer iter = NULL;
|
MonoClassField *field;
|
MonoClass *field_class;
|
|
if (!klass->valuetype)
|
return TRUE;
|
|
type = klass->byval_arg.type;
|
/*primitive type fields are not properly decoded*/
|
if ((type >= MONO_TYPE_BOOLEAN && type <= MONO_TYPE_R8) || (type >= MONO_TYPE_I && type <= MONO_TYPE_U))
|
return TRUE;
|
|
while ((field = mono_class_get_fields (klass, &iter)) != NULL) {
|
if (!field->type)
|
return FALSE;
|
|
if (field->type->attrs & (FIELD_ATTRIBUTE_STATIC | FIELD_ATTRIBUTE_HAS_FIELD_RVA))
|
continue;
|
|
field_class = mono_class_get_generic_type_definition (mono_class_from_mono_type (field->type));
|
|
if (field_class == target_class || klass == field_class || !verify_valuetype_layout_with_target (field_class, target_class))
|
return FALSE;
|
}
|
|
return TRUE;
|
}
|
|
static gboolean
|
verify_valuetype_layout (MonoClass *klass)
|
{
|
gboolean res;
|
res = verify_valuetype_layout_with_target (klass, klass);
|
return res;
|
}
|
|
static gboolean
|
recursive_mark_constraint_args (MonoBitSet *used_args, MonoGenericContainer *gc, MonoType *type)
|
{
|
int idx;
|
MonoClass **constraints;
|
MonoGenericParamInfo *param_info;
|
|
g_assert (mono_type_is_generic_argument (type));
|
|
idx = mono_type_get_generic_param_num (type);
|
if (mono_bitset_test_fast (used_args, idx))
|
return FALSE;
|
|
mono_bitset_set_fast (used_args, idx);
|
param_info = mono_generic_container_get_param_info (gc, idx);
|
|
if (!param_info->constraints)
|
return TRUE;
|
|
for (constraints = param_info->constraints; *constraints; ++constraints) {
|
MonoClass *ctr = *constraints;
|
MonoType *constraint_type = &ctr->byval_arg;
|
|
if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
|
return FALSE;
|
}
|
return TRUE;
|
}
|
|
static gboolean
|
verify_generic_parameters (MonoClass *klass)
|
{
|
int i;
|
MonoGenericContainer *gc = mono_class_get_generic_container (klass);
|
MonoBitSet *used_args = mono_bitset_new (gc->type_argc, 0);
|
|
for (i = 0; i < gc->type_argc; ++i) {
|
MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
|
MonoClass **constraints;
|
|
if (!param_info->constraints)
|
continue;
|
|
mono_bitset_clear_all (used_args);
|
mono_bitset_set_fast (used_args, i);
|
|
for (constraints = param_info->constraints; *constraints; ++constraints) {
|
MonoClass *ctr = *constraints;
|
MonoType *constraint_type = &ctr->byval_arg;
|
|
if (!mono_class_can_access_class (klass, ctr))
|
goto fail;
|
|
if (!mono_type_is_valid_type_in_context (constraint_type, &gc->context))
|
goto fail;
|
|
if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
|
goto fail;
|
if (mono_class_is_ginst (ctr) && !mono_class_is_valid_generic_instantiation (NULL, ctr))
|
goto fail;
|
}
|
}
|
mono_bitset_free (used_args);
|
return TRUE;
|
|
fail:
|
mono_bitset_free (used_args);
|
return FALSE;
|
}
|
|
/*
|
* Check if the class is verifiable.
|
*
|
* Right now there are no conditions that make a class a valid but not verifiable. Both overlapping reference
|
* field and invalid generic instantiation are fatal errors.
|
*
|
* This method must be safe to be called from mono_class_init and all code must be carefull about that.
|
*
|
*/
|
gboolean
|
mono_verifier_verify_class (MonoClass *klass)
|
{
|
/*Neither <Module>, object or ifaces have parent.*/
|
if (!klass->parent &&
|
klass != mono_defaults.object_class &&
|
!MONO_CLASS_IS_INTERFACE (klass) &&
|
(!image_is_dynamic (klass->image) && klass->type_token != 0x2000001)) /*<Module> is the first type in the assembly*/
|
return FALSE;
|
if (klass->parent) {
|
if (MONO_CLASS_IS_INTERFACE (klass->parent))
|
return FALSE;
|
if (!mono_class_is_ginst (klass) && mono_class_is_gtd (klass->parent))
|
return FALSE;
|
if (mono_class_is_ginst (klass->parent) && !mono_class_is_ginst (klass)) {
|
MonoGenericContext *context = mono_class_get_context (klass);
|
if (mono_class_is_gtd (klass))
|
context = &mono_class_get_generic_container (klass)->context;
|
if (!mono_type_is_valid_type_in_context (&klass->parent->byval_arg, context))
|
return FALSE;
|
}
|
}
|
if (mono_class_is_gtd (klass) && (mono_class_is_explicit_layout (klass)))
|
return FALSE;
|
if (mono_class_is_gtd (klass) && !verify_generic_parameters (klass))
|
return FALSE;
|
if (!verify_class_for_overlapping_reference_fields (klass))
|
return FALSE;
|
if (mono_class_is_ginst (klass) && !mono_class_is_valid_generic_instantiation (NULL, klass))
|
return FALSE;
|
if (!mono_class_is_ginst (klass) && !verify_class_fields (klass))
|
return FALSE;
|
if (klass->valuetype && !verify_valuetype_layout (klass))
|
return FALSE;
|
if (!verify_interfaces (klass))
|
return FALSE;
|
return TRUE;
|
}
|
|
gboolean
|
mono_verifier_class_is_valid_generic_instantiation (MonoClass *klass)
|
{
|
return mono_class_is_valid_generic_instantiation (NULL, klass);
|
}
|
|
gboolean
|
mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
|
{
|
if (!method->is_inflated)
|
return TRUE;
|
return mono_method_is_valid_generic_instantiation (NULL, method);
|
}
|
|
#else
|
|
gboolean
|
mono_verifier_verify_class (MonoClass *klass)
|
{
|
/* The verifier was disabled at compile time */
|
return TRUE;
|
}
|
|
GSList*
|
mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility, gboolean is_fulltrust)
|
{
|
/* The verifier was disabled at compile time */
|
return NULL;
|
}
|
|
gboolean
|
mono_verifier_is_class_full_trust (MonoClass *klass)
|
{
|
/* The verifier was disabled at compile time */
|
return TRUE;
|
}
|
|
gboolean
|
mono_verifier_is_method_full_trust (MonoMethod *method)
|
{
|
/* The verifier was disabled at compile time */
|
return TRUE;
|
}
|
|
gboolean
|
mono_verifier_is_enabled_for_image (MonoImage *image)
|
{
|
/* The verifier was disabled at compile time */
|
return FALSE;
|
}
|
|
gboolean
|
mono_verifier_is_enabled_for_class (MonoClass *klass)
|
{
|
/* The verifier was disabled at compile time */
|
return FALSE;
|
}
|
|
gboolean
|
mono_verifier_is_enabled_for_method (MonoMethod *method)
|
{
|
/* The verifier was disabled at compile time */
|
return FALSE;
|
}
|
|
GSList*
|
mono_method_verify (MonoMethod *method, int level)
|
{
|
/* The verifier was disabled at compile time */
|
return NULL;
|
}
|
|
void
|
mono_free_verify_list (GSList *list)
|
{
|
/* The verifier was disabled at compile time */
|
/* will always be null if verifier is disabled */
|
}
|
|
gboolean
|
mono_verifier_class_is_valid_generic_instantiation (MonoClass *klass)
|
{
|
return TRUE;
|
}
|
|
gboolean
|
mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
|
{
|
return TRUE;
|
}
|
|
|
|
#endif
|
