/* * verify.c: * * 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 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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; /*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, }; 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->dynamic) return mono_reflection_is_valid_dynamic_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 (klass->exception_type) return FALSE; for (i = 0; i < klass->method.count; ++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 && klass->generic_container) return FALSE; 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 { void X() { new Bar (); } } * * 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 {} * class A: B {} * The type A has a parent B, that is inflated into the GTD B<>. * Since A is open, thus not instantiatable, this is valid. */ if (paramClass->generic_container && param_type->type != MONO_TYPE_GENERICINST && !ginst->is_open) return FALSE; /*it's not safe to call mono_class_init from here*/ if (paramClass->generic_class && !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; } /* * Return true if @candidate is constraint compatible with @target. * * This means that @candidate constraints are a super set of @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 where K : IFace * Foo where T : U where U : IFace * ... * Bar <- 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 (gtd->generic_class) gtd = gtd->generic_class->container_class; gc = gtd->generic_container; } 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 = klass->generic_class; MonoGenericInst *ginst = gklass->context.class_inst; MonoGenericContainer *gc = gklass->container_class->generic_container; 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 = klass->generic_class; MonoGenericInst *ginst = gklass->context.class_inst; MonoGenericContainer *gc = gklass->container_class->generic_container; 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_loader_get_last_error () || klass->exception_type != MONO_EXCEPTION_NONE) { if (klass->generic_class && !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); mono_loader_clear_error (); return FALSE; } if (klass->generic_class && klass->generic_class->container_class->exception_type != MONO_EXCEPTION_NONE) { 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 (!klass->generic_class) 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) { MonoClassField *field; MonoClass *klass = NULL; if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) { field = 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 (ctx->image, token, &klass, ctx->generic_context); } if (!field || !field->parent || !klass || mono_loader_get_last_error ()) { 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); mono_loader_clear_error (); 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 = mono_method_get_wrapper_data (ctx->method, (guint32)token); } else { 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_full (ctx->image, token, NULL, ctx->generic_context); } if (!method || mono_loader_get_last_error ()) { 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); mono_loader_clear_error (); 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 *class = mono_method_get_wrapper_data (ctx->method, (guint32)token); type = class ? &class->byval_arg : NULL; } else { 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_full (ctx->image, token, ctx->generic_context); } if (!type || mono_loader_get_last_error ()) { 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); mono_loader_clear_error (); 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; } static const char * stack_slot_get_name (ILStackDesc *value) { return type_names [value->stype & TYPE_MASK]; } #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"); 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; } ////////////////////////////////////////////////////////////////// void mono_free_verify_list (GSList *list) { MonoVerifyInfoExtended *info; GSList *tmp; for (tmp = list; tmp; tmp = tmp->next) { info = 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; if (MONO_OFFSET_IN_FILTER (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" or a "struct Foo"? */ return !arg->type->data.generic_class->container_class->valuetype; } 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 *class; 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 (!(class = 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 (class->generic_container && 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: "); 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 /*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; } static MonoClass* get_ienumerable_class (void) { static MonoClass* generic_ienumerable_class = NULL; if (generic_ienumerable_class == NULL) generic_ienumerable_class = mono_class_from_name (mono_defaults.corlib, "System.Collections.Generic", "IEnumerable`1"); return generic_ienumerable_class; } static MonoClass* get_icollection_class (void) { static MonoClass* generic_icollection_class = NULL; if (generic_icollection_class == NULL) generic_icollection_class = mono_class_from_name (mono_defaults.corlib, "System.Collections.Generic", "ICollection`1"); return generic_icollection_class; } static MonoClass* get_ireadonlylist_class (void) { static MonoClass* generic_ireadonlylist_class = NULL; if (generic_ireadonlylist_class == NULL) generic_ireadonlylist_class = mono_class_from_name (mono_defaults.corlib, "System.Collections.Generic", "IReadOnlyList`1"); return generic_ireadonlylist_class; } static MonoClass* get_ireadonlycollection_class (void) { static MonoClass* generic_ireadonlycollection_class = NULL; if (generic_ireadonlycollection_class == NULL) generic_ireadonlycollection_class = mono_class_from_name (mono_defaults.corlib, "System.Collections.Generic", "IReadOnlyCollection`1"); return generic_ireadonlycollection_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) || !target->generic_class || candidate->rank != 1) return FALSE; iface_gtd = target->generic_class->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 (target->generic_class->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 **class; if (!param) return FALSE; for (class = mono_generic_param_info (param)->constraints; class && *class; ++class) { if (recursive_boxed_constraint_type_check (ctx, type, *class, 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 **class; if (!param) return FALSE; for (class = mono_generic_param_info (param)->constraints; class && *class; ++class) { /*256 should be enough since there can't be more than 255 generic arguments.*/ if (recursive_boxed_constraint_type_check (ctx, type, *class, 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); 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) && !(method->klass->flags & TYPE_ATTRIBUTE_SEALED) && !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) && !is_first_arg_bound) 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 } /* 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; } } } 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)); set_stack_value (ctx, stack_push (ctx), ctx->locals [arg], take_addr); } } 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 && 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 (!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 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_get_type (a) == TYPE_COMPLEX && stack_slot_get_type (b) == TYPE_COMPLEX) { 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) { CODE_NOT_VERIFIABLE (ctx, g_strdup_printf("Compare 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 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 || 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) { 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) && !(method->klass->flags & TYPE_ATTRIBUTE_SEALED)) { virt_check_this = TRUE; ctx->code [ctx->ip_offset].flags |= IL_CODE_CALL_NONFINAL_VIRTUAL; } } if (!(sig = mono_method_get_signature_full (method, ctx->image, method_token, ctx->generic_context))) sig = mono_method_get_signature (method, ctx->image, method_token); 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", name, method->name, ctx->ip_offset)); g_free (name); return; } param_count = sig->param_count + sig->hasthis; if (!check_underflow (ctx, param_count)) return; 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 (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)); } 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), 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; } 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 ((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); set_stack_value (ctx, stack_push (ctx), field->type, take_addr); } 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; 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)); set_stack_value (ctx, stack_push (ctx), field->type, take_addr); } 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*/ 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) { 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 = 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 (ctx->image, token, &handle_class, ctx->generic_context); } if (!handle) { ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid token 0x%x for ldtoken at 0x%04x", token, ctx->ip_offset)); 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 (method->klass->flags & (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)); } 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; } } /* * 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 = 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) { ILStackDesc *top; 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 && !ctx->image->dynamic) { 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; // 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 (old_class->flags & TYPE_ATTRIBUTE_INTERFACE) { 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 (new_class->flags & TYPE_ATTRIBUTE_INTERFACE) { 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. * 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 token, 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 && !method->klass->is_generic && 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 (method); if (!ctx.header) { ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method header")); 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 = g_memdup (ctx.header->locals, sizeof (MonoType*) * ctx.header->num_locals); MEM_ALLOC (sizeof (MonoType*) * ctx.header->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 && (method->klass->generic_container || 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 = &method->klass->generic_container->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); 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 = 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 = 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 intruction 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 && ctx.method->klass->parent->exception_type != MONO_EXCEPTION_NONE) 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 (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.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; } /* * Returns true if @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); } /* * Returns true if @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->dynamic; } /* * 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 *class) { int i = 0, j; gpointer iter = NULL; MonoClassField *field; gboolean is_fulltrust = mono_verifier_is_class_full_trust (class); /*We can't skip types with !has_references since this is calculated after we have run.*/ if (!((class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT)) 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 (class, &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; for (j = i; j < class->field.count; ++j) { MonoClassField *other = &class->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 = key; return g_str_hash (field->name) ^ mono_metadata_type_hash (field->type); /**/ } static gboolean field_equals (gconstpointer _a, gconstpointer _b) { const MonoClassField *a = _a; const MonoClassField *b = _b; return !strcmp (a->name, b->name) && mono_metadata_type_equal (a->type, b->type); } static gboolean verify_class_fields (MonoClass *class) { gpointer iter = NULL; MonoClassField *field; MonoGenericContext *context = mono_class_get_context (class); GHashTable *unique_fields = g_hash_table_new_full (&field_hash, &field_equals, NULL, NULL); if (class->generic_container) context = &class->generic_container->context; while ((field = mono_class_get_fields (class, &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 *class) { int i; for (i = 0; i < class->interface_count; ++i) { MonoClass *iface = class->interfaces [i]; if (!(iface->flags & TYPE_ATTRIBUTE_INTERFACE)) return FALSE; } return TRUE; } static gboolean verify_valuetype_layout_with_target (MonoClass *class, MonoClass *target_class) { int type; gpointer iter = NULL; MonoClassField *field; MonoClass *field_class; if (!class->valuetype) return TRUE; type = class->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 (class, &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 || class == field_class || !verify_valuetype_layout_with_target (field_class, target_class)) return FALSE; } return TRUE; } static gboolean verify_valuetype_layout (MonoClass *class) { gboolean res; res = verify_valuetype_layout_with_target (class, class); 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 *class) { int i; MonoGenericContainer *gc = class->generic_container; 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 (class, 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 (ctr->generic_class && !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 *class) { /*Neither , object or ifaces have parent.*/ if (!class->parent && class != mono_defaults.object_class && !MONO_CLASS_IS_INTERFACE (class) && (!class->image->dynamic && class->type_token != 0x2000001)) /* is the first type in the assembly*/ return FALSE; if (class->parent) { if (MONO_CLASS_IS_INTERFACE (class->parent)) return FALSE; if (!class->generic_class && class->parent->generic_container) return FALSE; if (class->parent->generic_class && !class->generic_class) { MonoGenericContext *context = mono_class_get_context (class); if (class->generic_container) context = &class->generic_container->context; if (!mono_type_is_valid_type_in_context (&class->parent->byval_arg, context)) return FALSE; } } if (class->generic_container && (class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT) return FALSE; if (class->generic_container && !verify_generic_parameters (class)) return FALSE; if (!verify_class_for_overlapping_reference_fields (class)) return FALSE; if (class->generic_class && !mono_class_is_valid_generic_instantiation (NULL, class)) return FALSE; if (class->generic_class == NULL && !verify_class_fields (class)) return FALSE; if (class->valuetype && !verify_valuetype_layout (class)) return FALSE; if (!verify_interfaces (class)) return FALSE; return TRUE; } gboolean mono_verifier_class_is_valid_generic_instantiation (MonoClass *class) { return mono_class_is_valid_generic_instantiation (NULL, class); } 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 *class) { /* 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 *class) { return TRUE; } gboolean mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method) { return TRUE; } #endif