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Guard against lazy initialization of idepth.
[mono-project.git] / mono / metadata / verify.c
blob8648d94623e0fab5db1223d0c660f865c6dc56f5
1 /*
2 * verify.c:
3 *
4 * Author:
5 * Mono Project (http://www.mono-project.com)
6 *
7 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
8 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
9 */
10 #include <config.h>
11
12 #include <mono/metadata/object-internals.h>
13 #include <mono/metadata/verify.h>
14 #include <mono/metadata/verify-internals.h>
15 #include <mono/metadata/opcodes.h>
16 #include <mono/metadata/tabledefs.h>
17 #include <mono/metadata/reflection.h>
18 #include <mono/metadata/debug-helpers.h>
19 #include <mono/metadata/mono-endian.h>
20 #include <mono/metadata/metadata.h>
21 #include <mono/metadata/metadata-internals.h>
22 #include <mono/metadata/class-internals.h>
23 #include <mono/metadata/security-manager.h>
24 #include <mono/metadata/security-core-clr.h>
25 #include <mono/metadata/tokentype.h>
26 #include <mono/metadata/mono-basic-block.h>
27 #include <mono/utils/mono-counters.h>
28 #include <mono/utils/monobitset.h>
29 #include <string.h>
30 #include <signal.h>
31 #include <ctype.h>
32
33 static MiniVerifierMode verifier_mode = MONO_VERIFIER_MODE_OFF;
34 static gboolean verify_all = FALSE;
35
36 /*
37 * Set the desired level of checks for the verfier.
38 *
39 */
40 void
41 mono_verifier_set_mode (MiniVerifierMode mode)
42 {
43 verifier_mode = mode;
44 }
45
46 void
47 mono_verifier_enable_verify_all ()
48 {
49 verify_all = TRUE;
50 }
51
52 #ifndef DISABLE_VERIFIER
53 /*
54 * Pull the list of opcodes
55 */
56 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
57 a = i,
58
59 enum {
60 #include "mono/cil/opcode.def"
61 LAST = 0xff
62 };
63 #undef OPDEF
64
65 #ifdef MONO_VERIFIER_DEBUG
66 #define VERIFIER_DEBUG(code) do { code } while (0)
67 #else
68 #define VERIFIER_DEBUG(code)
69 #endif
70
71 //////////////////////////////////////////////////////////////////
72 #define IS_STRICT_MODE(ctx) (((ctx)->level & MONO_VERIFY_NON_STRICT) == 0)
73 #define IS_FAIL_FAST_MODE(ctx) (((ctx)->level & MONO_VERIFY_FAIL_FAST) == MONO_VERIFY_FAIL_FAST)
74 #define IS_SKIP_VISIBILITY(ctx) (((ctx)->level & MONO_VERIFY_SKIP_VISIBILITY) == MONO_VERIFY_SKIP_VISIBILITY)
75 #define IS_REPORT_ALL_ERRORS(ctx) (((ctx)->level & MONO_VERIFY_REPORT_ALL_ERRORS) == MONO_VERIFY_REPORT_ALL_ERRORS)
76 #define CLEAR_PREFIX(ctx, prefix) do { (ctx)->prefix_set &= ~(prefix); } while (0)
77 #define ADD_VERIFY_INFO(__ctx, __msg, __status, __exception) \
78 do { \
79 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
80 vinfo->info.status = __status; \
81 vinfo->info.message = ( __msg ); \
82 vinfo->exception_type = (__exception); \
83 (__ctx)->list = g_slist_prepend ((__ctx)->list, vinfo); \
84 } while (0)
85
86 //TODO support MONO_VERIFY_REPORT_ALL_ERRORS
87 #define ADD_VERIFY_ERROR(__ctx, __msg) \
88 do { \
89 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, MONO_EXCEPTION_INVALID_PROGRAM); \
90 (__ctx)->valid = 0; \
91 } while (0)
92
93 #define CODE_NOT_VERIFIABLE(__ctx, __msg) \
94 do { \
95 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
96 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, MONO_EXCEPTION_UNVERIFIABLE_IL); \
97 (__ctx)->verifiable = 0; \
98 if (IS_FAIL_FAST_MODE (__ctx)) \
99 (__ctx)->valid = 0; \
100 } \
101 } while (0)
102
103 #define ADD_VERIFY_ERROR2(__ctx, __msg, __exception) \
104 do { \
105 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, __exception); \
106 (__ctx)->valid = 0; \
107 } while (0)
108
109 #define CODE_NOT_VERIFIABLE2(__ctx, __msg, __exception) \
110 do { \
111 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
112 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, __exception); \
113 (__ctx)->verifiable = 0; \
114 if (IS_FAIL_FAST_MODE (__ctx)) \
115 (__ctx)->valid = 0; \
116 } \
117 } while (0)
118
119 #define CHECK_ADD4_OVERFLOW_UN(a, b) ((guint32)(0xFFFFFFFFU) - (guint32)(b) < (guint32)(a))
120 #define CHECK_ADD8_OVERFLOW_UN(a, b) ((guint64)(0xFFFFFFFFFFFFFFFFUL) - (guint64)(b) < (guint64)(a))
121
122 #if SIZEOF_VOID_P == 4
123 #define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD4_OVERFLOW_UN(a, b)
124 #else
125 #define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD8_OVERFLOW_UN(a, b)
126 #endif
127
128 #define ADDP_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADDP_OVERFLOW_UN (a, b))
129 #define ADD_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADD4_OVERFLOW_UN (a, b))
130
131 /*Flags to be used with ILCodeDesc::flags */
132 enum {
133 /*Instruction has not been processed.*/
134 IL_CODE_FLAG_NOT_PROCESSED = 0,
135 /*Instruction was decoded by mono_method_verify loop.*/
136 IL_CODE_FLAG_SEEN = 1,
137 /*Instruction was target of a branch or is at a protected block boundary.*/
138 IL_CODE_FLAG_WAS_TARGET = 2,
139 /*Used by stack_init to avoid double initialize each entry.*/
140 IL_CODE_FLAG_STACK_INITED = 4,
141 /*Used by merge_stacks to decide if it should just copy the eval stack.*/
142 IL_CODE_STACK_MERGED = 8,
143 /*This instruction is part of the delegate construction sequence, it cannot be target of a branch.*/
144 IL_CODE_DELEGATE_SEQUENCE = 0x10,
145 /*This is a delegate created from a ldftn to a non final virtual method*/
146 IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL = 0x20,
147 /*This is a call to a non final virtual method*/
148 IL_CODE_CALL_NONFINAL_VIRTUAL = 0x40,
149 };
150
151 typedef enum {
152 RESULT_VALID,
153 RESULT_UNVERIFIABLE,
154 RESULT_INVALID
155 } verify_result_t;
156
157 typedef struct {
158 MonoType *type;
159 int stype;
160 MonoMethod *method;
161 } ILStackDesc;
162
163
164 typedef struct {
165 ILStackDesc *stack;
166 guint16 size, max_size;
167 guint16 flags;
168 } ILCodeDesc;
169
170 typedef struct {
171 int max_args;
172 int max_stack;
173 int verifiable;
174 int valid;
175 int level;
176
177 int code_size;
178 ILCodeDesc *code;
179 ILCodeDesc eval;
180
181 MonoType **params;
182 GSList *list;
183 /*Allocated fnptr MonoType that should be freed by us.*/
184 GSList *funptrs;
185 /*Type dup'ed exception types from catch blocks.*/
186 GSList *exception_types;
187
188 int num_locals;
189 MonoType **locals;
190
191 /*TODO get rid of target here, need_merge in mono_method_verify and hoist the merging code in the branching code*/
192 int target;
193
194 guint32 ip_offset;
195 MonoMethodSignature *signature;
196 MonoMethodHeader *header;
197
198 MonoGenericContext *generic_context;
199 MonoImage *image;
200 MonoMethod *method;
201
202 /*This flag helps solving a corner case of delegate verification in that you cannot have a "starg 0"
203 *on a method that creates a delegate for a non-final virtual method using ldftn*/
204 gboolean has_this_store;
205
206 /*This flag is used to control if the contructor of the parent class has been called.
207 *If the this pointer is pushed on the eval stack and it's a reference type constructor and
208 * super_ctor_called is false, the uninitialized flag is set on the pushed value.
209 *
210 * Poping an uninitialized this ptr from the eval stack is an unverifiable operation unless
211 * the safe variant is used. Only a few opcodes can use it : dup, pop, ldfld, stfld and call to a constructor.
212 */
213 gboolean super_ctor_called;
214
215 guint32 prefix_set;
216 gboolean has_flags;
217 MonoType *constrained_type;
218 } VerifyContext;
219
220 static void
221 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external);
222
223 static int
224 get_stack_type (MonoType *type);
225
226 static gboolean
227 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn);
228
229 static gboolean
230 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass);
231
232 static gboolean
233 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method);
234
235 static MonoGenericParam*
236 verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type);
237
238 static gboolean
239 verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate);
240 //////////////////////////////////////////////////////////////////
241
242
243
244 enum {
245 TYPE_INV = 0, /* leave at 0. */
246 TYPE_I4 = 1,
247 TYPE_I8 = 2,
248 TYPE_NATIVE_INT = 3,
249 TYPE_R8 = 4,
250 /* Used by operator tables to resolve pointer types (managed & unmanaged) and by unmanaged pointer types*/
251 TYPE_PTR = 5,
252 /* value types and classes */
253 TYPE_COMPLEX = 6,
254 /* Number of types, used to define the size of the tables*/
255 TYPE_MAX = 6,
256
257 /* Used by tables to signal that a result is not verifiable*/
258 NON_VERIFIABLE_RESULT = 0x80,
259
260 /*Mask used to extract just the type, excluding flags */
261 TYPE_MASK = 0x0F,
262
263 /* The stack type is a managed pointer, unmask the value to res */
264 POINTER_MASK = 0x100,
265
266 /*Stack type with the pointer mask*/
267 RAW_TYPE_MASK = 0x10F,
268
269 /* Controlled Mutability Manager Pointer */
270 CMMP_MASK = 0x200,
271
272 /* The stack type is a null literal*/
273 NULL_LITERAL_MASK = 0x400,
274
275 /**Used by ldarg.0 and family to let delegate verification happens.*/
276 THIS_POINTER_MASK = 0x800,
277
278 /**Signals that this is a boxed value type*/
279 BOXED_MASK = 0x1000,
280
281 /*This is an unitialized this ref*/
282 UNINIT_THIS_MASK = 0x2000,
283 };
284
285 static const char* const
286 type_names [TYPE_MAX + 1] = {
287 "Invalid",
288 "Int32",
289 "Int64",
290 "Native Int",
291 "Float64",
292 "Native Pointer",
293 "Complex"
294 };
295
296 enum {
297 PREFIX_UNALIGNED = 1,
298 PREFIX_VOLATILE = 2,
299 PREFIX_TAIL = 4,
300 PREFIX_CONSTRAINED = 8,
301 PREFIX_READONLY = 16
302 };
303 //////////////////////////////////////////////////////////////////
304
305 #ifdef ENABLE_VERIFIER_STATS
306
307 #define MEM_ALLOC(amt) do { allocated_memory += (amt); working_set += (amt); } while (0)
308 #define MEM_FREE(amt) do { working_set -= (amt); } while (0)
309
310 static int allocated_memory;
311 static int working_set;
312 static int max_allocated_memory;
313 static int max_working_set;
314 static int total_allocated_memory;
315
316 static void
317 finish_collect_stats (void)
318 {
319 max_allocated_memory = MAX (max_allocated_memory, allocated_memory);
320 max_working_set = MAX (max_working_set, working_set);
321 total_allocated_memory += allocated_memory;
322 allocated_memory = working_set = 0;
323 }
324
325 static void
326 init_verifier_stats (void)
327 {
328 static gboolean inited;
329 if (!inited) {
330 inited = TRUE;
331 mono_counters_register ("Maximum memory allocated during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_allocated_memory);
332 mono_counters_register ("Maximum memory used during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_working_set);
333 mono_counters_register ("Total memory allocated for verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &total_allocated_memory);
334 }
335 }
336
337 #else
338
339 #define MEM_ALLOC(amt) do {} while (0)
340 #define MEM_FREE(amt) do { } while (0)
341
342 #define finish_collect_stats()
343 #define init_verifier_stats()
344
345 #endif
346
347
348 //////////////////////////////////////////////////////////////////
349
350
351 /*Token validation macros and functions */
352 #define IS_MEMBER_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_MEMBERREF)
353 #define IS_METHOD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
354 #define IS_METHOD_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_METHODSPEC)
355 #define IS_FIELD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_FIELD)
356
357 #define IS_TYPE_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEREF)
358 #define IS_TYPE_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEDEF)
359 #define IS_TYPE_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPESPEC)
360 #define IS_METHOD_DEF_OR_REF_OR_SPEC(token) (IS_METHOD_DEF (token) || IS_MEMBER_REF (token) || IS_METHOD_SPEC (token))
361 #define IS_TYPE_DEF_OR_REF_OR_SPEC(token) (IS_TYPE_DEF (token) || IS_TYPE_REF (token) || IS_TYPE_SPEC (token))
362 #define IS_FIELD_DEF_OR_REF(token) (IS_FIELD_DEF (token) || IS_MEMBER_REF (token))
363
364 /*
365 * Verify if @token refers to a valid row on int's table.
366 */
367 static gboolean
368 token_bounds_check (MonoImage *image, guint32 token)
369 {
370 if (image->dynamic)
371 return mono_reflection_is_valid_dynamic_token ((MonoDynamicImage*)image, token);
372 return image->tables [mono_metadata_token_table (token)].rows >= mono_metadata_token_index (token) && mono_metadata_token_index (token) > 0;
373 }
374
375 static MonoType *
376 mono_type_create_fnptr_from_mono_method (VerifyContext *ctx, MonoMethod *method)
377 {
378 MonoType *res = g_new0 (MonoType, 1);
379 MEM_ALLOC (sizeof (MonoType));
380
381 //FIXME use mono_method_get_signature_full
382 res->data.method = mono_method_signature (method);
383 res->type = MONO_TYPE_FNPTR;
384 ctx->funptrs = g_slist_prepend (ctx->funptrs, res);
385 return res;
386 }
387
388 /*
389 * mono_type_is_enum_type:
390 *
391 * Returns TRUE if @type is an enum type.
392 */
393 static gboolean
394 mono_type_is_enum_type (MonoType *type)
395 {
396 if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
397 return TRUE;
398 if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
399 return TRUE;
400 return FALSE;
401 }
402
403 /*
404 * mono_type_is_value_type:
405 *
406 * Returns TRUE if @type is named after @namespace.@name.
407 *
408 */
409 static gboolean
410 mono_type_is_value_type (MonoType *type, const char *namespace, const char *name)
411 {
412 return type->type == MONO_TYPE_VALUETYPE &&
413 !strcmp (namespace, type->data.klass->name_space) &&
414 !strcmp (name, type->data.klass->name);
415 }
416
417 /*
418 * Returns TURE if @type is VAR or MVAR
419 */
420 static gboolean
421 mono_type_is_generic_argument (MonoType *type)
422 {
423 return type->type == MONO_TYPE_VAR || type->type == MONO_TYPE_MVAR;
424 }
425
426 /*
427 * mono_type_get_underlying_type_any:
428 *
429 * This functions is just like mono_type_get_underlying_type but it doesn't care if the type is byref.
430 *
431 * Returns the underlying type of @type regardless if it is byref or not.
432 */
433 static MonoType*
434 mono_type_get_underlying_type_any (MonoType *type)
435 {
436 if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
437 return mono_class_enum_basetype (type->data.klass);
438 if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
439 return mono_class_enum_basetype (type->data.generic_class->container_class);
440 return type;
441 }
442
443 static G_GNUC_UNUSED const char*
444 mono_type_get_stack_name (MonoType *type)
445 {
446 return type_names [get_stack_type (type) & TYPE_MASK];
447 }
448
449 #define CTOR_REQUIRED_FLAGS (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_RT_SPECIAL_NAME)
450 #define CTOR_INVALID_FLAGS (METHOD_ATTRIBUTE_STATIC)
451
452 static gboolean
453 mono_method_is_constructor (MonoMethod *method)
454 {
455 return ((method->flags & CTOR_REQUIRED_FLAGS) == CTOR_REQUIRED_FLAGS &&
456 !(method->flags & CTOR_INVALID_FLAGS) &&
457 !strcmp (".ctor", method->name));
458 }
459
460 static gboolean
461 mono_class_has_default_constructor (MonoClass *klass)
462 {
463 MonoMethod *method;
464 int i;
465
466 mono_class_setup_methods (klass);
467 if (klass->exception_type)
468 return FALSE;
469
470 for (i = 0; i < klass->method.count; ++i) {
471 method = klass->methods [i];
472 if (mono_method_is_constructor (method) &&
473 mono_method_signature (method) &&
474 mono_method_signature (method)->param_count == 0 &&
475 (method->flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK) == METHOD_ATTRIBUTE_PUBLIC)
476 return TRUE;
477 }
478 return FALSE;
479 }
480
481 /*
482 * Verify if @type is valid for the given @ctx verification context.
483 * this function checks for VAR and MVAR types that are invalid under the current verifier,
484 */
485 static gboolean
486 mono_type_is_valid_type_in_context_full (MonoType *type, MonoGenericContext *context, gboolean check_gtd)
487 {
488 int i;
489 MonoGenericInst *inst;
490
491 switch (type->type) {
492 case MONO_TYPE_VAR:
493 case MONO_TYPE_MVAR:
494 if (!context)
495 return FALSE;
496 inst = type->type == MONO_TYPE_VAR ? context->class_inst : context->method_inst;
497 if (!inst || mono_type_get_generic_param_num (type) >= inst->type_argc)
498 return FALSE;
499 break;
500 case MONO_TYPE_SZARRAY:
501 return mono_type_is_valid_type_in_context_full (&type->data.klass->byval_arg, context, check_gtd);
502 case MONO_TYPE_ARRAY:
503 return mono_type_is_valid_type_in_context_full (&type->data.array->eklass->byval_arg, context, check_gtd);
504 case MONO_TYPE_PTR:
505 return mono_type_is_valid_type_in_context_full (type->data.type, context, check_gtd);
506 case MONO_TYPE_GENERICINST:
507 inst = type->data.generic_class->context.class_inst;
508 if (!inst->is_open)
509 break;
510 for (i = 0; i < inst->type_argc; ++i)
511 if (!mono_type_is_valid_type_in_context_full (inst->type_argv [i], context, check_gtd))
512 return FALSE;
513 break;
514 case MONO_TYPE_CLASS:
515 case MONO_TYPE_VALUETYPE: {
516 MonoClass *klass = type->data.klass;
517 /*
518 * It's possible to encode generic'sh types in such a way that they disguise themselves as class or valuetype.
519 * Fixing the type decoding is really tricky since under some cases this behavior is needed, for example, to
520 * have a 'class' type pointing to a 'genericinst' class.
521 *
522 * For the runtime these non canonical (weird) encodings work fine, they worst they can cause is some
523 * reflection oddities which are harmless - to security at least.
524 */
525 if (klass->byval_arg.type != type->type)
526 return mono_type_is_valid_type_in_context_full (&klass->byval_arg, context, check_gtd);
527
528 if (check_gtd && klass->generic_container)
529 return FALSE;
530 break;
531 }
532 }
533 return TRUE;
534 }
535
536 static gboolean
537 mono_type_is_valid_type_in_context (MonoType *type, MonoGenericContext *context)
538 {
539 return mono_type_is_valid_type_in_context_full (type, context, FALSE);
540 }
541
542 /*This function returns NULL if the type is not instantiatable*/
543 static MonoType*
544 verifier_inflate_type (VerifyContext *ctx, MonoType *type, MonoGenericContext *context)
545 {
546 MonoError error;
547 MonoType *result;
548
549 result = mono_class_inflate_generic_type_checked (type, context, &error);
550 if (!mono_error_ok (&error)) {
551 mono_error_cleanup (&error);
552 return NULL;
553 }
554 return result;
555 }
556
557 /*A side note here. We don't need to check if arguments are broken since this
558 is only need to be done by the runtime before realizing the type.
559 */
560 static gboolean
561 is_valid_generic_instantiation (MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
562 {
563 MonoError error;
564 int i;
565
566 if (ginst->type_argc != gc->type_argc)
567 return FALSE;
568
569 for (i = 0; i < gc->type_argc; ++i) {
570 MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
571 MonoClass *paramClass;
572 MonoClass **constraints;
573 MonoType *param_type = ginst->type_argv [i];
574
575 /*it's not our job to validate type variables*/
576 if (mono_type_is_generic_argument (param_type))
577 continue;
578
579 paramClass = mono_class_from_mono_type (param_type);
580
581
582 /* A GTD can't be a generic argument.
583 *
584 * Due to how types are encoded we must check for the case of a genericinst MonoType and GTD MonoClass.
585 * This happens in cases such as: class Foo<T> { void X() { new Bar<T> (); } }
586 *
587 * Open instantiations can have GTDs as this happens when one type is instantiated with others params
588 * and the former has an expansion into the later. For example:
589 * class B<K> {}
590 * class A<T>: B<K> {}
591 * The type A <K> has a parent B<K>, that is inflated into the GTD B<>.
592 * Since A<K> is open, thus not instantiatable, this is valid.
593 */
594 if (paramClass->generic_container && param_type->type != MONO_TYPE_GENERICINST && !ginst->is_open)
595 return FALSE;
596
597 /*it's not safe to call mono_class_init from here*/
598 if (paramClass->generic_class && !paramClass->inited) {
599 if (!mono_class_is_valid_generic_instantiation (NULL, paramClass))
600 return FALSE;
601 }
602
603 if (!param_info->constraints && !(param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK))
604 continue;
605
606 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && (!paramClass->valuetype || mono_class_is_nullable (paramClass)))
607 return FALSE;
608
609 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && paramClass->valuetype)
610 return FALSE;
611
612 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !paramClass->valuetype && !mono_class_has_default_constructor (paramClass))
613 return FALSE;
614
615 if (!param_info->constraints)
616 continue;
617
618 for (constraints = param_info->constraints; *constraints; ++constraints) {
619 MonoClass *ctr = *constraints;
620 MonoType *inflated;
621
622 inflated = mono_class_inflate_generic_type_checked (&ctr->byval_arg, context, &error);
623 if (!mono_error_ok (&error)) {
624 mono_error_cleanup (&error);
625 return FALSE;
626 }
627 ctr = mono_class_from_mono_type (inflated);
628 mono_metadata_free_type (inflated);
629
630 /*FIXME maybe we need the same this as verifier_class_is_assignable_from*/
631 if (!mono_class_is_assignable_from_slow (ctr, paramClass))
632 return FALSE;
633 }
634 }
635 return TRUE;
636 }
637
638 /*
639 * Return true if @candidate is constraint compatible with @target.
640 *
641 * This means that @candidate constraints are a super set of @target constaints
642 */
643 static gboolean
644 mono_generic_param_is_constraint_compatible (VerifyContext *ctx, MonoGenericParam *target, MonoGenericParam *candidate, MonoClass *candidate_param_class, MonoGenericContext *context)
645 {
646 MonoGenericParamInfo *tinfo = mono_generic_param_info (target);
647 MonoGenericParamInfo *cinfo = mono_generic_param_info (candidate);
648
649 int tmask = tinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
650 int cmask = cinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
651 if ((tmask & cmask) != tmask)
652 return FALSE;
653
654 if (tinfo->constraints) {
655 MonoClass **target_class, **candidate_class;
656 for (target_class = tinfo->constraints; *target_class; ++target_class) {
657 MonoClass *tc;
658 MonoType *inflated = verifier_inflate_type (ctx, &(*target_class)->byval_arg, context);
659 if (!inflated)
660 return FALSE;
661 tc = mono_class_from_mono_type (inflated);
662 mono_metadata_free_type (inflated);
663
664 /*
665 * A constraint from @target might inflate into @candidate itself and in that case we don't need
666 * check it's constraints since it satisfy the constraint by itself.
667 */
668 if (mono_metadata_type_equal (&tc->byval_arg, &candidate_param_class->byval_arg))
669 continue;
670
671 if (!cinfo->constraints)
672 return FALSE;
673
674 for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
675 MonoClass *cc;
676 inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
677 if (!inflated)
678 return FALSE;
679 cc = mono_class_from_mono_type (inflated);
680 mono_metadata_free_type (inflated);
681
682 if (verifier_class_is_assignable_from (tc, cc))
683 break;
684
685 /*
686 * This happens when we have the following:
687 *
688 * Bar<K> where K : IFace
689 * Foo<T, U> where T : U where U : IFace
690 * ...
691 * Bar<T> <- T here satisfy K constraint transitively through to U's constraint
692 *
693 */
694 if (mono_type_is_generic_argument (&cc->byval_arg)) {
695 MonoGenericParam *other_candidate = verifier_get_generic_param_from_type (ctx, &cc->byval_arg);
696
697 if (mono_generic_param_is_constraint_compatible (ctx, target, other_candidate, cc, context)) {
698 break;
699 }
700 }
701 }
702 if (!*candidate_class)
703 return FALSE;
704 }
705 }
706 return TRUE;
707 }
708
709 static MonoGenericParam*
710 verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type)
711 {
712 MonoGenericContainer *gc;
713 MonoMethod *method = ctx->method;
714 int num;
715
716 num = mono_type_get_generic_param_num (type);
717
718 if (type->type == MONO_TYPE_VAR) {
719 MonoClass *gtd = method->klass;
720 if (gtd->generic_class)
721 gtd = gtd->generic_class->container_class;
722 gc = gtd->generic_container;
723 } else { //MVAR
724 MonoMethod *gmd = method;
725 if (method->is_inflated)
726 gmd = ((MonoMethodInflated*)method)->declaring;
727 gc = mono_method_get_generic_container (gmd);
728 }
729 if (!gc)
730 return NULL;
731 return mono_generic_container_get_param (gc, num);
732 }
733
734
735
736 /*
737 * Verify if @type is valid for the given @ctx verification context.
738 * this function checks for VAR and MVAR types that are invalid under the current verifier,
739 * This means that it either
740 */
741 static gboolean
742 is_valid_type_in_context (VerifyContext *ctx, MonoType *type)
743 {
744 return mono_type_is_valid_type_in_context (type, ctx->generic_context);
745 }
746
747 static gboolean
748 is_valid_generic_instantiation_in_context (VerifyContext *ctx, MonoGenericInst *ginst)
749 {
750 int i;
751 for (i = 0; i < ginst->type_argc; ++i) {
752 MonoType *type = ginst->type_argv [i];
753 if (!is_valid_type_in_context (ctx, type))
754 return FALSE;
755 }
756 return TRUE;
757 }
758
759 static gboolean
760 generic_arguments_respect_constraints (VerifyContext *ctx, MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
761 {
762 int i;
763 for (i = 0; i < ginst->type_argc; ++i) {
764 MonoType *type = ginst->type_argv [i];
765 MonoGenericParam *target = mono_generic_container_get_param (gc, i);
766 MonoGenericParam *candidate;
767 MonoClass *candidate_class;
768
769 if (!mono_type_is_generic_argument (type))
770 continue;
771
772 if (!is_valid_type_in_context (ctx, type))
773 return FALSE;
774
775 candidate = verifier_get_generic_param_from_type (ctx, type);
776 candidate_class = mono_class_from_mono_type (type);
777
778 if (!mono_generic_param_is_constraint_compatible (ctx, target, candidate, candidate_class, context))
779 return FALSE;
780 }
781 return TRUE;
782 }
783
784 static gboolean
785 mono_method_repect_method_constraints (VerifyContext *ctx, MonoMethod *method)
786 {
787 MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
788 MonoGenericInst *ginst = gmethod->context.method_inst;
789 MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
790 return !gc || generic_arguments_respect_constraints (ctx, gc, &gmethod->context, ginst);
791 }
792
793 static gboolean
794 mono_class_repect_method_constraints (VerifyContext *ctx, MonoClass *klass)
795 {
796 MonoGenericClass *gklass = klass->generic_class;
797 MonoGenericInst *ginst = gklass->context.class_inst;
798 MonoGenericContainer *gc = gklass->container_class->generic_container;
799 return !gc || generic_arguments_respect_constraints (ctx, gc, &gklass->context, ginst);
800 }
801
802 static gboolean
803 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method)
804 {
805 MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
806 MonoGenericInst *ginst = gmethod->context.method_inst;
807 MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
808 if (!gc) /*non-generic inflated method - it's part of a generic type */
809 return TRUE;
810 if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst))
811 return FALSE;
812 return is_valid_generic_instantiation (gc, &gmethod->context, ginst);
813
814 }
815
816 static gboolean
817 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass)
818 {
819 MonoGenericClass *gklass = klass->generic_class;
820 MonoGenericInst *ginst = gklass->context.class_inst;
821 MonoGenericContainer *gc = gklass->container_class->generic_container;
822 if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst))
823 return FALSE;
824 return is_valid_generic_instantiation (gc, &gklass->context, ginst);
825 }
826
827 static gboolean
828 mono_type_is_valid_in_context (VerifyContext *ctx, MonoType *type)
829 {
830 MonoClass *klass;
831
832 if (type == NULL) {
833 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid null type at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
834 return FALSE;
835 }
836
837 if (!is_valid_type_in_context (ctx, type)) {
838 char *str = mono_type_full_name (type);
839 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type (%s%s) (argument out of range or %s is not generic) at 0x%04x",
840 type->type == MONO_TYPE_VAR ? "!" : "!!",
841 str,
842 type->type == MONO_TYPE_VAR ? "class" : "method",
843 ctx->ip_offset),
844 MONO_EXCEPTION_BAD_IMAGE);
845 g_free (str);
846 return FALSE;
847 }
848
849 klass = mono_class_from_mono_type (type);
850 mono_class_init (klass);
851 if (mono_loader_get_last_error () || klass->exception_type != MONO_EXCEPTION_NONE) {
852 if (klass->generic_class && !mono_class_is_valid_generic_instantiation (NULL, klass))
853 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);
854 else
855 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);
856 mono_loader_clear_error ();
857 return FALSE;
858 }
859
860 if (klass->generic_class && klass->generic_class->container_class->exception_type != MONO_EXCEPTION_NONE) {
861 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);
862 return FALSE;
863 }
864
865 if (!klass->generic_class)
866 return TRUE;
867
868 if (!mono_class_is_valid_generic_instantiation (ctx, klass)) {
869 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);
870 return FALSE;
871 }
872
873 if (!mono_class_repect_method_constraints (ctx, klass)) {
874 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);
875 return FALSE;
876 }
877
878 return TRUE;
879 }
880
881 static verify_result_t
882 mono_method_is_valid_in_context (VerifyContext *ctx, MonoMethod *method)
883 {
884 if (!mono_type_is_valid_in_context (ctx, &method->klass->byval_arg))
885 return RESULT_INVALID;
886
887 if (!method->is_inflated)
888 return RESULT_VALID;
889
890 if (!mono_method_is_valid_generic_instantiation (ctx, method)) {
891 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);
892 return RESULT_INVALID;
893 }
894
895 if (!mono_method_repect_method_constraints (ctx, method)) {
896 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));
897 return RESULT_UNVERIFIABLE;
898 }
899 return RESULT_VALID;
900 }
901
902
903 static MonoClassField*
904 verifier_load_field (VerifyContext *ctx, int token, MonoClass **out_klass, const char *opcode) {
905 MonoClassField *field;
906 MonoClass *klass = NULL;
907
908 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
909 field = mono_method_get_wrapper_data (ctx->method, (guint32)token);
910 klass = field ? field->parent : NULL;
911 } else {
912 if (!IS_FIELD_DEF_OR_REF (token) || !token_bounds_check (ctx->image, token)) {
913 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);
914 return NULL;
915 }
916
917 field = mono_field_from_token (ctx->image, token, &klass, ctx->generic_context);
918 }
919
920 if (!field || !field->parent || !klass || mono_loader_get_last_error ()) {
921 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);
922 mono_loader_clear_error ();
923 return NULL;
924 }
925
926 if (!mono_type_is_valid_in_context (ctx, &klass->byval_arg))
927 return NULL;
928
929 if (mono_field_get_flags (field) & FIELD_ATTRIBUTE_LITERAL) {
930 char *type_name = mono_type_get_full_name (field->parent);
931 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot reference literal field %s::%s at 0x%04x", type_name, field->name, ctx->ip_offset));
932 g_free (type_name);
933 return NULL;
934 }
935
936 *out_klass = klass;
937 return field;
938 }
939
940 static MonoMethod*
941 verifier_load_method (VerifyContext *ctx, int token, const char *opcode) {
942 MonoMethod* method;
943
944 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
945 method = mono_method_get_wrapper_data (ctx->method, (guint32)token);
946 } else {
947 if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
948 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);
949 return NULL;
950 }
951
952 method = mono_get_method_full (ctx->image, token, NULL, ctx->generic_context);
953 }
954
955 if (!method || mono_loader_get_last_error ()) {
956 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);
957 mono_loader_clear_error ();
958 return NULL;
959 }
960
961 if (mono_method_is_valid_in_context (ctx, method) == RESULT_INVALID)
962 return NULL;
963
964 return method;
965 }
966
967 static MonoType*
968 verifier_load_type (VerifyContext *ctx, int token, const char *opcode) {
969 MonoType* type;
970
971 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
972 MonoClass *class = mono_method_get_wrapper_data (ctx->method, (guint32)token);
973 type = class ? &class->byval_arg : NULL;
974 } else {
975 if (!IS_TYPE_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
976 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid type token 0x%08x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
977 return NULL;
978 }
979 type = mono_type_get_full (ctx->image, token, ctx->generic_context);
980 }
981
982 if (!type || mono_loader_get_last_error ()) {
983 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);
984 mono_loader_clear_error ();
985 return NULL;
986 }
987
988 if (!mono_type_is_valid_in_context (ctx, type))
989 return NULL;
990
991 return type;
992 }
993
994
995 /* stack_slot_get_type:
996 *
997 * Returns the stack type of @value. This value includes POINTER_MASK.
998 *
999 * Use this function to checks that account for a managed pointer.
1000 */
1001 static gint32
1002 stack_slot_get_type (ILStackDesc *value)
1003 {
1004 return value->stype & RAW_TYPE_MASK;
1005 }
1006
1007 /* stack_slot_get_underlying_type:
1008 *
1009 * Returns the stack type of @value. This value does not include POINTER_MASK.
1010 *
1011 * Use this function is cases where the fact that the value could be a managed pointer is
1012 * irrelevant. For example, field load doesn't care about this fact of type on stack.
1013 */
1014 static gint32
1015 stack_slot_get_underlying_type (ILStackDesc *value)
1016 {
1017 return value->stype & TYPE_MASK;
1018 }
1019
1020 /* stack_slot_is_managed_pointer:
1021 *
1022 * Returns TRUE is @value is a managed pointer.
1023 */
1024 static gboolean
1025 stack_slot_is_managed_pointer (ILStackDesc *value)
1026 {
1027 return (value->stype & POINTER_MASK) == POINTER_MASK;
1028 }
1029
1030 /* stack_slot_is_managed_mutability_pointer:
1031 *
1032 * Returns TRUE is @value is a managed mutability pointer.
1033 */
1034 static G_GNUC_UNUSED gboolean
1035 stack_slot_is_managed_mutability_pointer (ILStackDesc *value)
1036 {
1037 return (value->stype & CMMP_MASK) == CMMP_MASK;
1038 }
1039
1040 /* stack_slot_is_null_literal:
1041 *
1042 * Returns TRUE is @value is the null literal.
1043 */
1044 static gboolean
1045 stack_slot_is_null_literal (ILStackDesc *value)
1046 {
1047 return (value->stype & NULL_LITERAL_MASK) == NULL_LITERAL_MASK;
1048 }
1049
1050
1051 /* stack_slot_is_this_pointer:
1052 *
1053 * Returns TRUE is @value is the this literal
1054 */
1055 static gboolean
1056 stack_slot_is_this_pointer (ILStackDesc *value)
1057 {
1058 return (value->stype & THIS_POINTER_MASK) == THIS_POINTER_MASK;
1059 }
1060
1061 /* stack_slot_is_boxed_value:
1062 *
1063 * Returns TRUE is @value is a boxed value
1064 */
1065 static gboolean
1066 stack_slot_is_boxed_value (ILStackDesc *value)
1067 {
1068 return (value->stype & BOXED_MASK) == BOXED_MASK;
1069 }
1070
1071 static const char *
1072 stack_slot_get_name (ILStackDesc *value)
1073 {
1074 return type_names [value->stype & TYPE_MASK];
1075 }
1076
1077 #define APPEND_WITH_PREDICATE(PRED,NAME) do {\
1078 if (PRED (value)) { \
1079 if (!first) \
1080 g_string_append (str, ", "); \
1081 g_string_append (str, NAME); \
1082 first = FALSE; \
1083 } } while (0)
1084
1085 static char*
1086 stack_slot_stack_type_full_name (ILStackDesc *value)
1087 {
1088 GString *str = g_string_new ("");
1089 char *result;
1090 gboolean has_pred = FALSE, first = TRUE;
1091
1092 if ((value->stype & TYPE_MASK) != value->stype) {
1093 g_string_append(str, "[");
1094 APPEND_WITH_PREDICATE (stack_slot_is_this_pointer, "this");
1095 APPEND_WITH_PREDICATE (stack_slot_is_boxed_value, "boxed");
1096 APPEND_WITH_PREDICATE (stack_slot_is_null_literal, "null");
1097 APPEND_WITH_PREDICATE (stack_slot_is_managed_mutability_pointer, "cmmp");
1098 APPEND_WITH_PREDICATE (stack_slot_is_managed_pointer, "mp");
1099 has_pred = TRUE;
1100 }
1101
1102 if (mono_type_is_generic_argument (value->type) && !stack_slot_is_boxed_value (value)) {
1103 if (!has_pred)
1104 g_string_append(str, "[");
1105 if (!first)
1106 g_string_append (str, ", ");
1107 g_string_append (str, "unboxed");
1108 has_pred = TRUE;
1109 }
1110
1111 if (has_pred)
1112 g_string_append(str, "] ");
1113
1114 g_string_append (str, stack_slot_get_name (value));
1115 result = str->str;
1116 g_string_free (str, FALSE);
1117 return result;
1118 }
1119
1120 static char*
1121 stack_slot_full_name (ILStackDesc *value)
1122 {
1123 char *type_name = mono_type_full_name (value->type);
1124 char *stack_name = stack_slot_stack_type_full_name (value);
1125 char *res = g_strdup_printf ("%s (%s)", type_name, stack_name);
1126 g_free (type_name);
1127 g_free (stack_name);
1128 return res;
1129 }
1130
1131 //////////////////////////////////////////////////////////////////
1132 void
1133 mono_free_verify_list (GSList *list)
1134 {
1135 MonoVerifyInfoExtended *info;
1136 GSList *tmp;
1137
1138 for (tmp = list; tmp; tmp = tmp->next) {
1139 info = tmp->data;
1140 g_free (info->info.message);
1141 g_free (info);
1142 }
1143 g_slist_free (list);
1144 }
1145
1146 #define ADD_ERROR(list,msg) \
1147 do { \
1148 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1149 vinfo->info.status = MONO_VERIFY_ERROR; \
1150 vinfo->info.message = (msg); \
1151 (list) = g_slist_prepend ((list), vinfo); \
1152 } while (0)
1153
1154 #define ADD_WARN(list,code,msg) \
1155 do { \
1156 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1157 vinfo->info.status = (code); \
1158 vinfo->info.message = (msg); \
1159 (list) = g_slist_prepend ((list), vinfo); \
1160 } while (0)
1161
1162 #define ADD_INVALID(list,msg) \
1163 do { \
1164 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1165 vinfo->status = MONO_VERIFY_ERROR; \
1166 vinfo->message = (msg); \
1167 (list) = g_slist_prepend ((list), vinfo); \
1168 /*G_BREAKPOINT ();*/ \
1169 goto invalid_cil; \
1170 } while (0)
1171
1172 #define CHECK_STACK_UNDERFLOW(num) \
1173 do { \
1174 if (cur_stack < (num)) \
1175 ADD_INVALID (list, g_strdup_printf ("Stack underflow at 0x%04x (%d items instead of %d)", ip_offset, cur_stack, (num))); \
1176 } while (0)
1177
1178 #define CHECK_STACK_OVERFLOW() \
1179 do { \
1180 if (cur_stack >= max_stack) \
1181 ADD_INVALID (list, g_strdup_printf ("Maxstack exceeded at 0x%04x", ip_offset)); \
1182 } while (0)
1183
1184
1185 static int
1186 in_any_block (MonoMethodHeader *header, guint offset)
1187 {
1188 int i;
1189 MonoExceptionClause *clause;
1190
1191 for (i = 0; i < header->num_clauses; ++i) {
1192 clause = &header->clauses [i];
1193 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1194 return 1;
1195 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1196 return 1;
1197 if (MONO_OFFSET_IN_FILTER (clause, offset))
1198 return 1;
1199 }
1200 return 0;
1201 }
1202
1203 /*
1204 * in_any_exception_block:
1205 *
1206 * Returns TRUE is @offset is part of any exception clause (filter, handler, catch, finally or fault).
1207 */
1208 static gboolean
1209 in_any_exception_block (MonoMethodHeader *header, guint offset)
1210 {
1211 int i;
1212 MonoExceptionClause *clause;
1213
1214 for (i = 0; i < header->num_clauses; ++i) {
1215 clause = &header->clauses [i];
1216 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1217 return TRUE;
1218 if (MONO_OFFSET_IN_FILTER (clause, offset))
1219 return TRUE;
1220 }
1221 return FALSE;
1222 }
1223
1224 /*
1225 * is_valid_branch_instruction:
1226 *
1227 * Verify if it's valid to perform a branch from @offset to @target.
1228 * This should be used with br and brtrue/false.
1229 * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1230 * The major diferent from other similiar functions is that branching into a
1231 * finally/fault block is invalid instead of just unverifiable.
1232 */
1233 static int
1234 is_valid_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1235 {
1236 int i;
1237 MonoExceptionClause *clause;
1238
1239 for (i = 0; i < header->num_clauses; ++i) {
1240 clause = &header->clauses [i];
1241 /*branching into a finally block is invalid*/
1242 if ((clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY || clause->flags == MONO_EXCEPTION_CLAUSE_FAULT) &&
1243 !MONO_OFFSET_IN_HANDLER (clause, offset) &&
1244 MONO_OFFSET_IN_HANDLER (clause, target))
1245 return 2;
1246
1247 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1248 return 1;
1249 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1250 return 1;
1251 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1252 return 1;
1253 }
1254 return 0;
1255 }
1256
1257 /*
1258 * is_valid_cmp_branch_instruction:
1259 *
1260 * Verify if it's valid to perform a branch from @offset to @target.
1261 * This should be used with binary comparison branching instruction, like beq, bge and similars.
1262 * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1263 *
1264 * The major diferences from other similar functions are that most errors lead to invalid
1265 * code and only branching out of finally, filter or fault clauses is unverifiable.
1266 */
1267 static int
1268 is_valid_cmp_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1269 {
1270 int i;
1271 MonoExceptionClause *clause;
1272
1273 for (i = 0; i < header->num_clauses; ++i) {
1274 clause = &header->clauses [i];
1275 /*branching out of a handler or finally*/
1276 if (clause->flags != MONO_EXCEPTION_CLAUSE_NONE &&
1277 MONO_OFFSET_IN_HANDLER (clause, offset) &&
1278 !MONO_OFFSET_IN_HANDLER (clause, target))
1279 return 1;
1280
1281 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1282 return 2;
1283 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1284 return 2;
1285 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1286 return 2;
1287 }
1288 return 0;
1289 }
1290
1291 /*
1292 * A leave can't escape a finally block
1293 */
1294 static int
1295 is_correct_leave (MonoMethodHeader *header, guint offset, guint target)
1296 {
1297 int i;
1298 MonoExceptionClause *clause;
1299
1300 for (i = 0; i < header->num_clauses; ++i) {
1301 clause = &header->clauses [i];
1302 if (clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY && MONO_OFFSET_IN_HANDLER (clause, offset) && !MONO_OFFSET_IN_HANDLER (clause, target))
1303 return 0;
1304 if (MONO_OFFSET_IN_FILTER (clause, offset))
1305 return 0;
1306 }
1307 return 1;
1308 }
1309
1310 /*
1311 * A rethrow can't happen outside of a catch handler.
1312 */
1313 static int
1314 is_correct_rethrow (MonoMethodHeader *header, guint offset)
1315 {
1316 int i;
1317 MonoExceptionClause *clause;
1318
1319 for (i = 0; i < header->num_clauses; ++i) {
1320 clause = &header->clauses [i];
1321 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1322 return 1;
1323 if (MONO_OFFSET_IN_FILTER (clause, offset))
1324 return 1;
1325 }
1326 return 0;
1327 }
1328
1329 /*
1330 * An endfinally can't happen outside of a finally/fault handler.
1331 */
1332 static int
1333 is_correct_endfinally (MonoMethodHeader *header, guint offset)
1334 {
1335 int i;
1336 MonoExceptionClause *clause;
1337
1338 for (i = 0; i < header->num_clauses; ++i) {
1339 clause = &header->clauses [i];
1340 if (MONO_OFFSET_IN_HANDLER (clause, offset) && (clause->flags == MONO_EXCEPTION_CLAUSE_FAULT || clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY))
1341 return 1;
1342 }
1343 return 0;
1344 }
1345
1346
1347 /*
1348 * An endfilter can only happens inside a filter clause.
1349 * In non-strict mode filter is allowed inside the handler clause too
1350 */
1351 static MonoExceptionClause *
1352 is_correct_endfilter (VerifyContext *ctx, guint offset)
1353 {
1354 int i;
1355 MonoExceptionClause *clause;
1356
1357 for (i = 0; i < ctx->header->num_clauses; ++i) {
1358 clause = &ctx->header->clauses [i];
1359 if (clause->flags != MONO_EXCEPTION_CLAUSE_FILTER)
1360 continue;
1361 if (MONO_OFFSET_IN_FILTER (clause, offset))
1362 return clause;
1363 if (!IS_STRICT_MODE (ctx) && MONO_OFFSET_IN_HANDLER (clause, offset))
1364 return clause;
1365 }
1366 return NULL;
1367 }
1368
1369
1370 /*
1371 * Non-strict endfilter can happens inside a try block or any handler block
1372 */
1373 static int
1374 is_unverifiable_endfilter (VerifyContext *ctx, guint offset)
1375 {
1376 int i;
1377 MonoExceptionClause *clause;
1378
1379 for (i = 0; i < ctx->header->num_clauses; ++i) {
1380 clause = &ctx->header->clauses [i];
1381 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1382 return 1;
1383 }
1384 return 0;
1385 }
1386
1387 static gboolean
1388 is_valid_bool_arg (ILStackDesc *arg)
1389 {
1390 if (stack_slot_is_managed_pointer (arg) || stack_slot_is_boxed_value (arg) || stack_slot_is_null_literal (arg))
1391 return TRUE;
1392
1393
1394 switch (stack_slot_get_underlying_type (arg)) {
1395 case TYPE_I4:
1396 case TYPE_I8:
1397 case TYPE_NATIVE_INT:
1398 case TYPE_PTR:
1399 return TRUE;
1400 case TYPE_COMPLEX:
1401 g_assert (arg->type);
1402 switch (arg->type->type) {
1403 case MONO_TYPE_CLASS:
1404 case MONO_TYPE_STRING:
1405 case MONO_TYPE_OBJECT:
1406 case MONO_TYPE_SZARRAY:
1407 case MONO_TYPE_ARRAY:
1408 case MONO_TYPE_FNPTR:
1409 case MONO_TYPE_PTR:
1410 return TRUE;
1411 case MONO_TYPE_GENERICINST:
1412 /*We need to check if the container class
1413 * of the generic type is a valuetype, iow:
1414 * is it a "class Foo<T>" or a "struct Foo<T>"?
1415 */
1416 return !arg->type->data.generic_class->container_class->valuetype;
1417 }
1418 default:
1419 return FALSE;
1420 }
1421 }
1422
1423
1424 /*Type manipulation helper*/
1425
1426 /*Returns the byref version of the supplied MonoType*/
1427 static MonoType*
1428 mono_type_get_type_byref (MonoType *type)
1429 {
1430 if (type->byref)
1431 return type;
1432 return &mono_class_from_mono_type (type)->this_arg;
1433 }
1434
1435
1436 /*Returns the byval version of the supplied MonoType*/
1437 static MonoType*
1438 mono_type_get_type_byval (MonoType *type)
1439 {
1440 if (!type->byref)
1441 return type;
1442 return &mono_class_from_mono_type (type)->byval_arg;
1443 }
1444
1445 static MonoType*
1446 mono_type_from_stack_slot (ILStackDesc *slot)
1447 {
1448 if (stack_slot_is_managed_pointer (slot))
1449 return mono_type_get_type_byref (slot->type);
1450 return slot->type;
1451 }
1452
1453 /*Stack manipulation code*/
1454
1455 static void
1456 ensure_stack_size (ILCodeDesc *stack, int required)
1457 {
1458 int new_size = 8;
1459 ILStackDesc *tmp;
1460
1461 if (required < stack->max_size)
1462 return;
1463
1464 /* We don't have to worry about the exponential growth since stack_copy prune unused space */
1465 new_size = MAX (8, MAX (required, stack->max_size * 2));
1466
1467 g_assert (new_size >= stack->size);
1468 g_assert (new_size >= required);
1469
1470 tmp = g_new0 (ILStackDesc, new_size);
1471 MEM_ALLOC (sizeof (ILStackDesc) * new_size);
1472
1473 if (stack->stack) {
1474 if (stack->size)
1475 memcpy (tmp, stack->stack, stack->size * sizeof (ILStackDesc));
1476 g_free (stack->stack);
1477 MEM_FREE (sizeof (ILStackDesc) * stack->max_size);
1478 }
1479
1480 stack->stack = tmp;
1481 stack->max_size = new_size;
1482 }
1483
1484 static void
1485 stack_init (VerifyContext *ctx, ILCodeDesc *state)
1486 {
1487 if (state->flags & IL_CODE_FLAG_STACK_INITED)
1488 return;
1489 state->size = state->max_size = 0;
1490 state->flags |= IL_CODE_FLAG_STACK_INITED;
1491 }
1492
1493 static void
1494 stack_copy (ILCodeDesc *to, ILCodeDesc *from)
1495 {
1496 ensure_stack_size (to, from->size);
1497 to->size = from->size;
1498
1499 /*stack copy happens at merge points, which have small stacks*/
1500 if (from->size)
1501 memcpy (to->stack, from->stack, sizeof (ILStackDesc) * from->size);
1502 }
1503
1504 static void
1505 copy_stack_value (ILStackDesc *to, ILStackDesc *from)
1506 {
1507 to->stype = from->stype;
1508 to->type = from->type;
1509 to->method = from->method;
1510 }
1511
1512 static int
1513 check_underflow (VerifyContext *ctx, int size)
1514 {
1515 if (ctx->eval.size < size) {
1516 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack underflow, required %d, but have %d at 0x%04x", size, ctx->eval.size, ctx->ip_offset));
1517 return 0;
1518 }
1519 return 1;
1520 }
1521
1522 static int
1523 check_overflow (VerifyContext *ctx)
1524 {
1525 if (ctx->eval.size >= ctx->max_stack) {
1526 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have stack-depth %d at 0x%04x", ctx->eval.size + 1, ctx->ip_offset));
1527 return 0;
1528 }
1529 return 1;
1530 }
1531
1532 /*This reject out PTR, FNPTR and TYPEDBYREF*/
1533 static gboolean
1534 check_unmanaged_pointer (VerifyContext *ctx, ILStackDesc *value)
1535 {
1536 if (stack_slot_get_type (value) == TYPE_PTR) {
1537 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
1538 return 0;
1539 }
1540 return 1;
1541 }
1542
1543 /*TODO verify if MONO_TYPE_TYPEDBYREF is not allowed here as well.*/
1544 static gboolean
1545 check_unverifiable_type (VerifyContext *ctx, MonoType *type)
1546 {
1547 if (type->type == MONO_TYPE_PTR || type->type == MONO_TYPE_FNPTR) {
1548 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
1549 return 0;
1550 }
1551 return 1;
1552 }
1553
1554 static ILStackDesc *
1555 stack_push (VerifyContext *ctx)
1556 {
1557 g_assert (ctx->eval.size < ctx->max_stack);
1558 g_assert (ctx->eval.size <= ctx->eval.max_size);
1559
1560 ensure_stack_size (&ctx->eval, ctx->eval.size + 1);
1561
1562 return & ctx->eval.stack [ctx->eval.size++];
1563 }
1564
1565 static ILStackDesc *
1566 stack_push_val (VerifyContext *ctx, int stype, MonoType *type)
1567 {
1568 ILStackDesc *top = stack_push (ctx);
1569 top->stype = stype;
1570 top->type = type;
1571 return top;
1572 }
1573
1574 static ILStackDesc *
1575 stack_pop (VerifyContext *ctx)
1576 {
1577 ILStackDesc *ret;
1578 g_assert (ctx->eval.size > 0);
1579 ret = ctx->eval.stack + --ctx->eval.size;
1580 if ((ret->stype & UNINIT_THIS_MASK) == UNINIT_THIS_MASK)
1581 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Found use of uninitialized 'this ptr' ref at 0x%04x", ctx->ip_offset));
1582 return ret;
1583 }
1584
1585 /* This function allows to safely pop an unititialized this ptr from
1586 * the eval stack without marking the method as unverifiable.
1587 */
1588 static ILStackDesc *
1589 stack_pop_safe (VerifyContext *ctx)
1590 {
1591 g_assert (ctx->eval.size > 0);
1592 return ctx->eval.stack + --ctx->eval.size;
1593 }
1594
1595 /*Positive number distance from stack top. [0] is stack top, [1] is the one below*/
1596 static ILStackDesc*
1597 stack_peek (VerifyContext *ctx, int distance)
1598 {
1599 g_assert (ctx->eval.size - distance > 0);
1600 return ctx->eval.stack + (ctx->eval.size - 1 - distance);
1601 }
1602
1603 static ILStackDesc *
1604 stack_push_stack_val (VerifyContext *ctx, ILStackDesc *value)
1605 {
1606 ILStackDesc *top = stack_push (ctx);
1607 copy_stack_value (top, value);
1608 return top;
1609 }
1610
1611 /* Returns the MonoType associated with the token, or NULL if it is invalid.
1612 *
1613 * A boxable type can be either a reference or value type, but cannot be a byref type or an unmanaged pointer
1614 * */
1615 static MonoType*
1616 get_boxable_mono_type (VerifyContext* ctx, int token, const char *opcode)
1617 {
1618 MonoType *type;
1619 MonoClass *class;
1620
1621 if (!(type = verifier_load_type (ctx, token, opcode)))
1622 return NULL;
1623
1624 if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
1625 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type for %s at 0x%04x", opcode, ctx->ip_offset));
1626 return NULL;
1627 }
1628
1629 if (type->type == MONO_TYPE_VOID) {
1630 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type for %s at 0x%04x", opcode, ctx->ip_offset));
1631 return NULL;
1632 }
1633
1634 if (type->type == MONO_TYPE_TYPEDBYREF)
1635 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid use of typedbyref for %s at 0x%04x", opcode, ctx->ip_offset));
1636
1637 if (!(class = mono_class_from_mono_type (type)))
1638 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not retrieve type token for %s at 0x%04x", opcode, ctx->ip_offset));
1639
1640 if (class->generic_container && type->type != MONO_TYPE_GENERICINST)
1641 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));
1642
1643 check_unverifiable_type (ctx, type);
1644 return type;
1645 }
1646
1647
1648 /*operation result tables */
1649
1650 static const unsigned char bin_op_table [TYPE_MAX][TYPE_MAX] = {
1651 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1652 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1653 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1654 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1655 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1656 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1657 };
1658
1659 static const unsigned char add_table [TYPE_MAX][TYPE_MAX] = {
1660 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1661 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1662 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1663 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1664 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
1665 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1666 };
1667
1668 static const unsigned char sub_table [TYPE_MAX][TYPE_MAX] = {
1669 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1670 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1671 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1672 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1673 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
1674 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1675 };
1676
1677 static const unsigned char int_bin_op_table [TYPE_MAX][TYPE_MAX] = {
1678 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1679 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1680 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1681 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1682 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1683 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1684 };
1685
1686 static const unsigned char shift_op_table [TYPE_MAX][TYPE_MAX] = {
1687 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1688 {TYPE_I8, TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV},
1689 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1690 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1691 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1692 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1693 };
1694
1695 static const unsigned char cmp_br_op [TYPE_MAX][TYPE_MAX] = {
1696 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1697 {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1698 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1699 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
1700 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV},
1701 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1702 };
1703
1704 static const unsigned char cmp_br_eq_op [TYPE_MAX][TYPE_MAX] = {
1705 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1706 {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1707 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV},
1708 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
1709 {TYPE_INV, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_I4, TYPE_INV},
1710 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4},
1711 };
1712
1713 static const unsigned char add_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
1714 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1715 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1716 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1717 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1718 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
1719 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1720 };
1721
1722 static const unsigned char sub_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
1723 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1724 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1725 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1726 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1727 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
1728 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1729 };
1730
1731 static const unsigned char bin_ovf_table [TYPE_MAX][TYPE_MAX] = {
1732 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1733 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1734 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1735 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1736 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1737 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1738 };
1739
1740 #ifdef MONO_VERIFIER_DEBUG
1741
1742 /*debug helpers */
1743 static void
1744 dump_stack_value (ILStackDesc *value)
1745 {
1746 printf ("[(%x)(%x)", value->type->type, value->stype);
1747
1748 if (stack_slot_is_this_pointer (value))
1749 printf ("[this] ");
1750
1751 if (stack_slot_is_boxed_value (value))
1752 printf ("[boxed] ");
1753
1754 if (stack_slot_is_null_literal (value))
1755 printf ("[null] ");
1756
1757 if (stack_slot_is_managed_mutability_pointer (value))
1758 printf ("Controled Mutability MP: ");
1759
1760 if (stack_slot_is_managed_pointer (value))
1761 printf ("Managed Pointer to: ");
1762
1763 switch (stack_slot_get_underlying_type (value)) {
1764 case TYPE_INV:
1765 printf ("invalid type]");
1766 return;
1767 case TYPE_I4:
1768 printf ("int32]");
1769 return;
1770 case TYPE_I8:
1771 printf ("int64]");
1772 return;
1773 case TYPE_NATIVE_INT:
1774 printf ("native int]");
1775 return;
1776 case TYPE_R8:
1777 printf ("float64]");
1778 return;
1779 case TYPE_PTR:
1780 printf ("unmanaged pointer]");
1781 return;
1782 case TYPE_COMPLEX:
1783 switch (value->type->type) {
1784 case MONO_TYPE_CLASS:
1785 case MONO_TYPE_VALUETYPE:
1786 printf ("complex] (%s)", value->type->data.klass->name);
1787 return;
1788 case MONO_TYPE_STRING:
1789 printf ("complex] (string)");
1790 return;
1791 case MONO_TYPE_OBJECT:
1792 printf ("complex] (object)");
1793 return;
1794 case MONO_TYPE_SZARRAY:
1795 printf ("complex] (%s [])", value->type->data.klass->name);
1796 return;
1797 case MONO_TYPE_ARRAY:
1798 printf ("complex] (%s [%d %d %d])",
1799 value->type->data.array->eklass->name,
1800 value->type->data.array->rank,
1801 value->type->data.array->numsizes,
1802 value->type->data.array->numlobounds);
1803 return;
1804 case MONO_TYPE_GENERICINST:
1805 printf ("complex] (inst of %s )", value->type->data.generic_class->container_class->name);
1806 return;
1807 case MONO_TYPE_VAR:
1808 printf ("complex] (type generic param !%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
1809 return;
1810 case MONO_TYPE_MVAR:
1811 printf ("complex] (method generic param !!%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
1812 return;
1813 default: {
1814 //should be a boxed value
1815 char * name = mono_type_full_name (value->type);
1816 printf ("complex] %s", name);
1817 g_free (name);
1818 return;
1819 }
1820 }
1821 default:
1822 printf ("unknown stack %x type]\n", value->stype);
1823 g_assert_not_reached ();
1824 }
1825 }
1826
1827 static void
1828 dump_stack_state (ILCodeDesc *state)
1829 {
1830 int i;
1831
1832 printf ("(%d) ", state->size);
1833 for (i = 0; i < state->size; ++i)
1834 dump_stack_value (state->stack + i);
1835 printf ("\n");
1836 }
1837 #endif
1838
1839 /*Returns TRUE if candidate array type can be assigned to target.
1840 *Both parameters MUST be of type MONO_TYPE_ARRAY (target->type == MONO_TYPE_ARRAY)
1841 */
1842 static gboolean
1843 is_array_type_compatible (MonoType *target, MonoType *candidate)
1844 {
1845 MonoArrayType *left = target->data.array;
1846 MonoArrayType *right = candidate->data.array;
1847
1848 g_assert (target->type == MONO_TYPE_ARRAY);
1849 g_assert (candidate->type == MONO_TYPE_ARRAY);
1850
1851 if (left->rank != right->rank)
1852 return FALSE;
1853
1854 return verifier_class_is_assignable_from (left->eklass, right->eklass);
1855 }
1856
1857 static int
1858 get_stack_type (MonoType *type)
1859 {
1860 int mask = 0;
1861 int type_kind = type->type;
1862 if (type->byref)
1863 mask = POINTER_MASK;
1864 /*TODO handle CMMP_MASK */
1865
1866 handle_enum:
1867 switch (type_kind) {
1868 case MONO_TYPE_I1:
1869 case MONO_TYPE_U1:
1870 case MONO_TYPE_BOOLEAN:
1871 case MONO_TYPE_I2:
1872 case MONO_TYPE_U2:
1873 case MONO_TYPE_CHAR:
1874 case MONO_TYPE_I4:
1875 case MONO_TYPE_U4:
1876 return TYPE_I4 | mask;
1877
1878 case MONO_TYPE_I:
1879 case MONO_TYPE_U:
1880 return TYPE_NATIVE_INT | mask;
1881
1882 /* FIXME: the spec says that you cannot have a pointer to method pointer, do we need to check this here? */
1883 case MONO_TYPE_FNPTR:
1884 case MONO_TYPE_PTR:
1885 case MONO_TYPE_TYPEDBYREF:
1886 return TYPE_PTR | mask;
1887
1888 case MONO_TYPE_VAR:
1889 case MONO_TYPE_MVAR:
1890
1891 case MONO_TYPE_CLASS:
1892 case MONO_TYPE_STRING:
1893 case MONO_TYPE_OBJECT:
1894 case MONO_TYPE_SZARRAY:
1895 case MONO_TYPE_ARRAY:
1896 return TYPE_COMPLEX | mask;
1897
1898 case MONO_TYPE_I8:
1899 case MONO_TYPE_U8:
1900 return TYPE_I8 | mask;
1901
1902 case MONO_TYPE_R4:
1903 case MONO_TYPE_R8:
1904 return TYPE_R8 | mask;
1905
1906 case MONO_TYPE_GENERICINST:
1907 case MONO_TYPE_VALUETYPE:
1908 if (mono_type_is_enum_type (type)) {
1909 type = mono_type_get_underlying_type_any (type);
1910 if (!type)
1911 return FALSE;
1912 type_kind = type->type;
1913 goto handle_enum;
1914 } else {
1915 return TYPE_COMPLEX | mask;
1916 }
1917
1918 default:
1919 return TYPE_INV;
1920 }
1921 }
1922
1923 /* convert MonoType to ILStackDesc format (stype) */
1924 static gboolean
1925 set_stack_value (VerifyContext *ctx, ILStackDesc *stack, MonoType *type, int take_addr)
1926 {
1927 int mask = 0;
1928 int type_kind = type->type;
1929
1930 if (type->byref || take_addr)
1931 mask = POINTER_MASK;
1932 /* TODO handle CMMP_MASK */
1933
1934 handle_enum:
1935 stack->type = type;
1936
1937 switch (type_kind) {
1938 case MONO_TYPE_I1:
1939 case MONO_TYPE_U1:
1940 case MONO_TYPE_BOOLEAN:
1941 case MONO_TYPE_I2:
1942 case MONO_TYPE_U2:
1943 case MONO_TYPE_CHAR:
1944 case MONO_TYPE_I4:
1945 case MONO_TYPE_U4:
1946 stack->stype = TYPE_I4 | mask;
1947 break;
1948 case MONO_TYPE_I:
1949 case MONO_TYPE_U:
1950 stack->stype = TYPE_NATIVE_INT | mask;
1951 break;
1952
1953 /*FIXME: Do we need to check if it's a pointer to the method pointer? The spec says it' illegal to have that.*/
1954 case MONO_TYPE_FNPTR:
1955 case MONO_TYPE_PTR:
1956 case MONO_TYPE_TYPEDBYREF:
1957 stack->stype = TYPE_PTR | mask;
1958 break;
1959
1960 case MONO_TYPE_CLASS:
1961 case MONO_TYPE_STRING:
1962 case MONO_TYPE_OBJECT:
1963 case MONO_TYPE_SZARRAY:
1964 case MONO_TYPE_ARRAY:
1965
1966 case MONO_TYPE_VAR:
1967 case MONO_TYPE_MVAR:
1968 stack->stype = TYPE_COMPLEX | mask;
1969 break;
1970
1971 case MONO_TYPE_I8:
1972 case MONO_TYPE_U8:
1973 stack->stype = TYPE_I8 | mask;
1974 break;
1975 case MONO_TYPE_R4:
1976 case MONO_TYPE_R8:
1977 stack->stype = TYPE_R8 | mask;
1978 break;
1979 case MONO_TYPE_GENERICINST:
1980 case MONO_TYPE_VALUETYPE:
1981 if (mono_type_is_enum_type (type)) {
1982 MonoType *utype = mono_type_get_underlying_type_any (type);
1983 if (!utype) {
1984 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve underlying type of %x at %d", type->type, ctx->ip_offset));
1985 return FALSE;
1986 }
1987 type = utype;
1988 type_kind = type->type;
1989 goto handle_enum;
1990 } else {
1991 stack->stype = TYPE_COMPLEX | mask;
1992 break;
1993 }
1994 default:
1995 VERIFIER_DEBUG ( printf ("unknown type 0x%02x in eval stack type\n", type->type); );
1996 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Illegal value set on stack 0x%02x at %d", type->type, ctx->ip_offset));
1997 return FALSE;
1998 }
1999 return TRUE;
2000 }
2001
2002 /*
2003 * init_stack_with_value_at_exception_boundary:
2004 *
2005 * Initialize the stack and push a given type.
2006 * The instruction is marked as been on the exception boundary.
2007 */
2008 static void
2009 init_stack_with_value_at_exception_boundary (VerifyContext *ctx, ILCodeDesc *code, MonoClass *klass)
2010 {
2011 MonoError error;
2012 MonoType *type = mono_class_inflate_generic_type_checked (&klass->byval_arg, ctx->generic_context, &error);
2013
2014 if (!mono_error_ok (&error)) {
2015 char *name = mono_type_get_full_name (klass);
2016 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid class %s used for exception", name));
2017 g_free (name);
2018 mono_error_cleanup (&error);
2019 return;
2020 }
2021
2022 if (!ctx->max_stack) {
2023 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack overflow at 0x%04x", ctx->ip_offset));
2024 return;
2025 }
2026
2027 stack_init (ctx, code);
2028 ensure_stack_size (code, 1);
2029 set_stack_value (ctx, code->stack, type, FALSE);
2030 ctx->exception_types = g_slist_prepend (ctx->exception_types, type);
2031 code->size = 1;
2032 code->flags |= IL_CODE_FLAG_WAS_TARGET;
2033 if (mono_type_is_generic_argument (type))
2034 code->stack->stype |= BOXED_MASK;
2035 }
2036
2037 static gboolean
2038 verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate)
2039 {
2040 static MonoClass* generic_icollection_class = NULL;
2041 static MonoClass* generic_ienumerable_class = NULL;
2042 MonoClass *iface_gtd;
2043
2044 if (mono_class_is_assignable_from (target, candidate))
2045 return TRUE;
2046
2047 if (!MONO_CLASS_IS_INTERFACE (target) || !target->generic_class || candidate->rank != 1)
2048 return FALSE;
2049
2050 if (generic_icollection_class == NULL) {
2051 generic_icollection_class = mono_class_from_name (mono_defaults.corlib,
2052 "System.Collections.Generic", "ICollection`1");
2053 generic_ienumerable_class = mono_class_from_name (mono_defaults.corlib,
2054 "System.Collections.Generic", "IEnumerable`1");
2055 }
2056 iface_gtd = target->generic_class->container_class;
2057 if (iface_gtd != mono_defaults.generic_ilist_class && iface_gtd != generic_icollection_class && iface_gtd != generic_ienumerable_class)
2058 return FALSE;
2059
2060 target = mono_class_from_mono_type (target->generic_class->context.class_inst->type_argv [0]);
2061 candidate = candidate->element_class;
2062 return mono_class_is_assignable_from (target, candidate);
2063 }
2064
2065 /*Verify if type 'candidate' can be stored in type 'target'.
2066 *
2067 * If strict, check for the underlying type and not the verification stack types
2068 */
2069 static gboolean
2070 verify_type_compatibility_full (VerifyContext *ctx, MonoType *target, MonoType *candidate, gboolean strict)
2071 {
2072 #define IS_ONE_OF3(T, A, B, C) (T == A || T == B || T == C)
2073 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
2074
2075 MonoType *original_candidate = candidate;
2076 VERIFIER_DEBUG ( printf ("checking type compatibility %s x %s strict %d\n", mono_type_full_name (target), mono_type_full_name (candidate), strict); );
2077
2078 /*only one is byref */
2079 if (candidate->byref ^ target->byref) {
2080 /* converting from native int to byref*/
2081 if (get_stack_type (candidate) == TYPE_NATIVE_INT && target->byref) {
2082 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("using byref native int at 0x%04x", ctx->ip_offset));
2083 return TRUE;
2084 }
2085 return FALSE;
2086 }
2087 strict |= target->byref;
2088 /*From now on we don't care about byref anymore, so it's ok to discard it here*/
2089 candidate = mono_type_get_underlying_type_any (candidate);
2090
2091 handle_enum:
2092 switch (target->type) {
2093 case MONO_TYPE_VOID:
2094 return candidate->type == MONO_TYPE_VOID;
2095 case MONO_TYPE_I1:
2096 case MONO_TYPE_U1:
2097 case MONO_TYPE_BOOLEAN:
2098 if (strict)
2099 return IS_ONE_OF3 (candidate->type, MONO_TYPE_I1, MONO_TYPE_U1, MONO_TYPE_BOOLEAN);
2100 case MONO_TYPE_I2:
2101 case MONO_TYPE_U2:
2102 case MONO_TYPE_CHAR:
2103 if (strict)
2104 return IS_ONE_OF3 (candidate->type, MONO_TYPE_I2, MONO_TYPE_U2, MONO_TYPE_CHAR);
2105 case MONO_TYPE_I4:
2106 case MONO_TYPE_U4: {
2107 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2108 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2109 if (strict)
2110 return is_native_int || is_int4;
2111 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2112 }
2113
2114 case MONO_TYPE_I8:
2115 case MONO_TYPE_U8:
2116 return IS_ONE_OF2 (candidate->type, MONO_TYPE_I8, MONO_TYPE_U8);
2117
2118 case MONO_TYPE_R4:
2119 case MONO_TYPE_R8:
2120 if (strict)
2121 return candidate->type == target->type;
2122 return IS_ONE_OF2 (candidate->type, MONO_TYPE_R4, MONO_TYPE_R8);
2123
2124 case MONO_TYPE_I:
2125 case MONO_TYPE_U: {
2126 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2127 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2128 if (strict)
2129 return is_native_int || is_int4;
2130 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2131 }
2132
2133 case MONO_TYPE_PTR:
2134 if (candidate->type != MONO_TYPE_PTR)
2135 return FALSE;
2136 /* check the underlying type */
2137 return verify_type_compatibility_full (ctx, target->data.type, candidate->data.type, TRUE);
2138
2139 case MONO_TYPE_FNPTR: {
2140 MonoMethodSignature *left, *right;
2141 if (candidate->type != MONO_TYPE_FNPTR)
2142 return FALSE;
2143
2144 left = mono_type_get_signature (target);
2145 right = mono_type_get_signature (candidate);
2146 return mono_metadata_signature_equal (left, right) && left->call_convention == right->call_convention;
2147 }
2148
2149 case MONO_TYPE_GENERICINST: {
2150 MonoClass *target_klass;
2151 MonoClass *candidate_klass;
2152 if (mono_type_is_enum_type (target)) {
2153 target = mono_type_get_underlying_type_any (target);
2154 if (!target)
2155 return FALSE;
2156 goto handle_enum;
2157 }
2158 /*
2159 * VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
2160 * to take boxing status into account.
2161 */
2162 if (mono_type_is_generic_argument (original_candidate))
2163 return FALSE;
2164
2165 target_klass = mono_class_from_mono_type (target);
2166 candidate_klass = mono_class_from_mono_type (candidate);
2167 if (mono_class_is_nullable (target_klass)) {
2168 if (!mono_class_is_nullable (candidate_klass))
2169 return FALSE;
2170 return target_klass == candidate_klass;
2171 }
2172 return verifier_class_is_assignable_from (target_klass, candidate_klass);
2173 }
2174
2175 case MONO_TYPE_STRING:
2176 return candidate->type == MONO_TYPE_STRING;
2177
2178 case MONO_TYPE_CLASS:
2179 /*
2180 * VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
2181 * to take boxing status into account.
2182 */
2183 if (mono_type_is_generic_argument (original_candidate))
2184 return FALSE;
2185
2186 if (candidate->type == MONO_TYPE_VALUETYPE)
2187 return FALSE;
2188
2189 /* If candidate is an enum it should return true for System.Enum and supertypes.
2190 * That's why here we use the original type and not the underlying type.
2191 */
2192 return verifier_class_is_assignable_from (target->data.klass, mono_class_from_mono_type (original_candidate));
2193
2194 case MONO_TYPE_OBJECT:
2195 return MONO_TYPE_IS_REFERENCE (candidate);
2196
2197 case MONO_TYPE_SZARRAY: {
2198 MonoClass *left;
2199 MonoClass *right;
2200 if (candidate->type != MONO_TYPE_SZARRAY)
2201 return FALSE;
2202
2203 left = mono_class_from_mono_type (target);
2204 right = mono_class_from_mono_type (candidate);
2205
2206 return verifier_class_is_assignable_from (left, right);
2207 }
2208
2209 case MONO_TYPE_ARRAY:
2210 if (candidate->type != MONO_TYPE_ARRAY)
2211 return FALSE;
2212 return is_array_type_compatible (target, candidate);
2213
2214 case MONO_TYPE_TYPEDBYREF:
2215 return candidate->type == MONO_TYPE_TYPEDBYREF;
2216
2217 case MONO_TYPE_VALUETYPE: {
2218 MonoClass *target_klass;
2219 MonoClass *candidate_klass;
2220
2221 if (candidate->type == MONO_TYPE_CLASS)
2222 return FALSE;
2223
2224 target_klass = mono_class_from_mono_type (target);
2225 candidate_klass = mono_class_from_mono_type (candidate);
2226 if (target_klass == candidate_klass)
2227 return TRUE;
2228 if (mono_type_is_enum_type (target)) {
2229 target = mono_type_get_underlying_type_any (target);
2230 if (!target)
2231 return FALSE;
2232 goto handle_enum;
2233 }
2234 return FALSE;
2235 }
2236
2237 case MONO_TYPE_VAR:
2238 if (candidate->type != MONO_TYPE_VAR)
2239 return FALSE;
2240 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2241
2242 case MONO_TYPE_MVAR:
2243 if (candidate->type != MONO_TYPE_MVAR)
2244 return FALSE;
2245 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2246
2247 default:
2248 VERIFIER_DEBUG ( printf ("unknown store type %d\n", target->type); );
2249 g_assert_not_reached ();
2250 return FALSE;
2251 }
2252 return 1;
2253 #undef IS_ONE_OF3
2254 #undef IS_ONE_OF2
2255 }
2256
2257 static gboolean
2258 verify_type_compatibility (VerifyContext *ctx, MonoType *target, MonoType *candidate)
2259 {
2260 return verify_type_compatibility_full (ctx, target, candidate, FALSE);
2261 }
2262
2263 /*
2264 * Returns the generic param bound to the context been verified.
2265 *
2266 */
2267 static MonoGenericParam*
2268 get_generic_param (VerifyContext *ctx, MonoType *param)
2269 {
2270 guint16 param_num = mono_type_get_generic_param_num (param);
2271 if (param->type == MONO_TYPE_VAR) {
2272 if (!ctx->generic_context->class_inst || ctx->generic_context->class_inst->type_argc <= param_num) {
2273 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic type argument %d", param_num));
2274 return NULL;
2275 }
2276 return ctx->generic_context->class_inst->type_argv [param_num]->data.generic_param;
2277 }
2278
2279 /*param must be a MVAR */
2280 if (!ctx->generic_context->method_inst || ctx->generic_context->method_inst->type_argc <= param_num) {
2281 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic method argument %d", param_num));
2282 return NULL;
2283 }
2284 return ctx->generic_context->method_inst->type_argv [param_num]->data.generic_param;
2285
2286 }
2287
2288 static gboolean
2289 recursive_boxed_constraint_type_check (VerifyContext *ctx, MonoType *type, MonoClass *constraint_class, int recursion_level)
2290 {
2291 MonoType *constraint_type = &constraint_class->byval_arg;
2292 if (recursion_level <= 0)
2293 return FALSE;
2294
2295 if (verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (constraint_type), FALSE))
2296 return TRUE;
2297
2298 if (mono_type_is_generic_argument (constraint_type)) {
2299 MonoGenericParam *param = get_generic_param (ctx, constraint_type);
2300 MonoClass **class;
2301 if (!param)
2302 return FALSE;
2303 for (class = mono_generic_param_info (param)->constraints; class && *class; ++class) {
2304 if (recursive_boxed_constraint_type_check (ctx, type, *class, recursion_level - 1))
2305 return TRUE;
2306 }
2307 }
2308 return FALSE;
2309 }
2310
2311 /*
2312 * is_compatible_boxed_valuetype:
2313 *
2314 * Returns TRUE if @candidate / @stack is a valid boxed valuetype.
2315 *
2316 * @type The source type. It it tested to be of the proper type.
2317 * @candidate type of the boxed valuetype.
2318 * @stack stack slot of the boxed valuetype, separate from @candidade since one could be changed before calling this function
2319 * @strict if TRUE candidate must be boxed compatible to the target type
2320 *
2321 */
2322 static gboolean
2323 is_compatible_boxed_valuetype (VerifyContext *ctx, MonoType *type, MonoType *candidate, ILStackDesc *stack, gboolean strict)
2324 {
2325 if (!stack_slot_is_boxed_value (stack))
2326 return FALSE;
2327 if (type->byref || candidate->byref)
2328 return FALSE;
2329
2330 if (mono_type_is_generic_argument (candidate)) {
2331 MonoGenericParam *param = get_generic_param (ctx, candidate);
2332 MonoClass **class;
2333 if (!param)
2334 return FALSE;
2335
2336 for (class = mono_generic_param_info (param)->constraints; class && *class; ++class) {
2337 /*256 should be enough since there can't be more than 255 generic arguments.*/
2338 if (recursive_boxed_constraint_type_check (ctx, type, *class, 256))
2339 return TRUE;
2340 }
2341 }
2342
2343 if (mono_type_is_generic_argument (type))
2344 return FALSE;
2345
2346 if (!strict)
2347 return TRUE;
2348
2349 return MONO_TYPE_IS_REFERENCE (type) && verifier_class_is_assignable_from (mono_class_from_mono_type (type), mono_class_from_mono_type (candidate));
2350 }
2351
2352 static int
2353 verify_stack_type_compatibility_full (VerifyContext *ctx, MonoType *type, ILStackDesc *stack, gboolean drop_byref, gboolean valuetype_must_be_boxed)
2354 {
2355 MonoType *candidate = mono_type_from_stack_slot (stack);
2356 if (MONO_TYPE_IS_REFERENCE (type) && !type->byref && stack_slot_is_null_literal (stack))
2357 return TRUE;
2358
2359 if (is_compatible_boxed_valuetype (ctx, type, candidate, stack, TRUE))
2360 return TRUE;
2361
2362 if (valuetype_must_be_boxed && !stack_slot_is_boxed_value (stack) && !MONO_TYPE_IS_REFERENCE (candidate))
2363 return FALSE;
2364
2365 if (!valuetype_must_be_boxed && stack_slot_is_boxed_value (stack))
2366 return FALSE;
2367
2368 if (drop_byref)
2369 return verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (candidate), FALSE);
2370
2371 return verify_type_compatibility_full (ctx, type, candidate, FALSE);
2372 }
2373
2374 static int
2375 verify_stack_type_compatibility (VerifyContext *ctx, MonoType *type, ILStackDesc *stack)
2376 {
2377 return verify_stack_type_compatibility_full (ctx, type, stack, FALSE, FALSE);
2378 }
2379
2380 static gboolean
2381 mono_delegate_type_equal (MonoType *target, MonoType *candidate)
2382 {
2383 if (candidate->byref ^ target->byref)
2384 return FALSE;
2385
2386 switch (target->type) {
2387 case MONO_TYPE_VOID:
2388 case MONO_TYPE_I1:
2389 case MONO_TYPE_U1:
2390 case MONO_TYPE_BOOLEAN:
2391 case MONO_TYPE_I2:
2392 case MONO_TYPE_U2:
2393 case MONO_TYPE_CHAR:
2394 case MONO_TYPE_I4:
2395 case MONO_TYPE_U4:
2396 case MONO_TYPE_I8:
2397 case MONO_TYPE_U8:
2398 case MONO_TYPE_R4:
2399 case MONO_TYPE_R8:
2400 case MONO_TYPE_I:
2401 case MONO_TYPE_U:
2402 case MONO_TYPE_STRING:
2403 case MONO_TYPE_TYPEDBYREF:
2404 return candidate->type == target->type;
2405
2406 case MONO_TYPE_PTR:
2407 if (candidate->type != MONO_TYPE_PTR)
2408 return FALSE;
2409 return mono_delegate_type_equal (target->data.type, candidate->data.type);
2410
2411 case MONO_TYPE_FNPTR:
2412 if (candidate->type != MONO_TYPE_FNPTR)
2413 return FALSE;
2414 return mono_delegate_signature_equal (mono_type_get_signature (target), mono_type_get_signature (candidate), FALSE);
2415
2416 case MONO_TYPE_GENERICINST: {
2417 MonoClass *target_klass;
2418 MonoClass *candidate_klass;
2419 target_klass = mono_class_from_mono_type (target);
2420 candidate_klass = mono_class_from_mono_type (candidate);
2421 /*FIXME handle nullables and enum*/
2422 return verifier_class_is_assignable_from (target_klass, candidate_klass);
2423 }
2424 case MONO_TYPE_OBJECT:
2425 return MONO_TYPE_IS_REFERENCE (candidate);
2426
2427 case MONO_TYPE_CLASS:
2428 return verifier_class_is_assignable_from(target->data.klass, mono_class_from_mono_type (candidate));
2429
2430 case MONO_TYPE_SZARRAY:
2431 if (candidate->type != MONO_TYPE_SZARRAY)
2432 return FALSE;
2433 return verifier_class_is_assignable_from (mono_class_from_mono_type (target)->element_class, mono_class_from_mono_type (candidate)->element_class);
2434
2435 case MONO_TYPE_ARRAY:
2436 if (candidate->type != MONO_TYPE_ARRAY)
2437 return FALSE;
2438 return is_array_type_compatible (target, candidate);
2439
2440 case MONO_TYPE_VALUETYPE:
2441 /*FIXME handle nullables and enum*/
2442 return mono_class_from_mono_type (candidate) == mono_class_from_mono_type (target);
2443
2444 case MONO_TYPE_VAR:
2445 return candidate->type == MONO_TYPE_VAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2446 return FALSE;
2447
2448 case MONO_TYPE_MVAR:
2449 return candidate->type == MONO_TYPE_MVAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2450 return FALSE;
2451
2452 default:
2453 VERIFIER_DEBUG ( printf ("Unknown type %d. Implement me!\n", target->type); );
2454 g_assert_not_reached ();
2455 return FALSE;
2456 }
2457 }
2458
2459 static gboolean
2460 mono_delegate_param_equal (MonoType *delegate, MonoType *method)
2461 {
2462 if (mono_metadata_type_equal_full (delegate, method, TRUE))
2463 return TRUE;
2464
2465 return mono_delegate_type_equal (method, delegate);
2466 }
2467
2468 static gboolean
2469 mono_delegate_ret_equal (MonoType *delegate, MonoType *method)
2470 {
2471 if (mono_metadata_type_equal_full (delegate, method, TRUE))
2472 return TRUE;
2473
2474 return mono_delegate_type_equal (delegate, method);
2475 }
2476
2477 /*
2478 * mono_delegate_signature_equal:
2479 *
2480 * Compare two signatures in the way expected by delegates.
2481 *
2482 * This function only exists due to the fact that it should ignore the 'has_this' part of the signature.
2483 *
2484 * FIXME can this function be eliminated and proper metadata functionality be used?
2485 */
2486 static gboolean
2487 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn)
2488 {
2489 int i;
2490 int method_offset = is_static_ldftn ? 1 : 0;
2491
2492 if (delegate_sig->param_count + method_offset != method_sig->param_count)
2493 return FALSE;
2494
2495 if (delegate_sig->call_convention != method_sig->call_convention)
2496 return FALSE;
2497
2498 for (i = 0; i < delegate_sig->param_count; i++) {
2499 MonoType *p1 = delegate_sig->params [i];
2500 MonoType *p2 = method_sig->params [i + method_offset];
2501
2502 if (!mono_delegate_param_equal (p1, p2))
2503 return FALSE;
2504 }
2505
2506 if (!mono_delegate_ret_equal (delegate_sig->ret, method_sig->ret))
2507 return FALSE;
2508
2509 return TRUE;
2510 }
2511
2512 gboolean
2513 mono_verifier_is_signature_compatible (MonoMethodSignature *target, MonoMethodSignature *candidate)
2514 {
2515 return mono_delegate_signature_equal (target, candidate, FALSE);
2516 }
2517
2518 /*
2519 * verify_ldftn_delegate:
2520 *
2521 * Verify properties of ldftn based delegates.
2522 */
2523 static void
2524 verify_ldftn_delegate (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2525 {
2526 MonoMethod *method = funptr->method;
2527
2528 /*ldftn non-final virtuals only allowed if method is not static,
2529 * the object is a this arg (comes from a ldarg.0), and there is no starg.0.
2530 * This rules doesn't apply if the object on stack is a boxed valuetype.
2531 */
2532 if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !(method->klass->flags & TYPE_ATTRIBUTE_SEALED) && !stack_slot_is_boxed_value (value)) {
2533 /*A stdarg 0 must not happen, we fail here only in fail fast mode to avoid double error reports*/
2534 if (IS_FAIL_FAST_MODE (ctx) && ctx->has_this_store)
2535 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", ctx->ip_offset));
2536
2537 /*current method must not be static*/
2538 if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
2539 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function at 0x%04x", ctx->ip_offset));
2540
2541 /*value is the this pointer, loaded using ldarg.0 */
2542 if (!stack_slot_is_this_pointer (value))
2543 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));
2544
2545 ctx->code [ctx->ip_offset].flags |= IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL;
2546 }
2547 }
2548
2549 /*
2550 * verify_delegate_compatibility:
2551 *
2552 * Verify delegate creation sequence.
2553 *
2554 */
2555 static void
2556 verify_delegate_compatibility (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2557 {
2558 #define IS_VALID_OPCODE(offset, opcode) (ip [ip_offset - offset] == opcode && (ctx->code [ip_offset - offset].flags & IL_CODE_FLAG_SEEN))
2559 #define IS_LOAD_FUN_PTR(kind) (IS_VALID_OPCODE (6, CEE_PREFIX1) && ip [ip_offset - 5] == kind)
2560
2561 MonoMethod *invoke, *method;
2562 const guint8 *ip = ctx->header->code;
2563 guint32 ip_offset = ctx->ip_offset;
2564 gboolean is_static_ldftn = FALSE, is_first_arg_bound = FALSE;
2565
2566 if (stack_slot_get_type (funptr) != TYPE_PTR || !funptr->method) {
2567 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid function pointer parameter for delegate constructor at 0x%04x", ctx->ip_offset));
2568 return;
2569 }
2570
2571 invoke = mono_get_delegate_invoke (delegate);
2572 method = funptr->method;
2573
2574 if (!method || !mono_method_signature (method)) {
2575 char *name = mono_type_get_full_name (delegate);
2576 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid method on stack to create delegate %s construction at 0x%04x", name, ctx->ip_offset));
2577 g_free (name);
2578 return;
2579 }
2580
2581 if (!invoke || !mono_method_signature (invoke)) {
2582 char *name = mono_type_get_full_name (delegate);
2583 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Delegate type %s with bad Invoke method at 0x%04x", name, ctx->ip_offset));
2584 g_free (name);
2585 return;
2586 }
2587
2588 is_static_ldftn = (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) && method->flags & METHOD_ATTRIBUTE_STATIC;
2589
2590 if (is_static_ldftn)
2591 is_first_arg_bound = mono_method_signature (invoke)->param_count + 1 == mono_method_signature (method)->param_count;
2592
2593 if (!mono_delegate_signature_equal (mono_method_signature (invoke), mono_method_signature (method), is_first_arg_bound)) {
2594 char *fun_sig = mono_signature_get_desc (mono_method_signature (method), FALSE);
2595 char *invoke_sig = mono_signature_get_desc (mono_method_signature (invoke), FALSE);
2596 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));
2597 g_free (fun_sig);
2598 g_free (invoke_sig);
2599 }
2600
2601 /*
2602 * Delegate code sequences:
2603 * [-6] ldftn token
2604 * newobj ...
2605 *
2606 *
2607 * [-7] dup
2608 * [-6] ldvirtftn token
2609 * newobj ...
2610 *
2611 * ldftn sequence:*/
2612 if (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) {
2613 verify_ldftn_delegate (ctx, delegate, value, funptr);
2614 } else if (ip_offset > 6 && IS_VALID_OPCODE (7, CEE_DUP) && IS_LOAD_FUN_PTR (CEE_LDVIRTFTN)) {
2615 ctx->code [ip_offset - 6].flags |= IL_CODE_DELEGATE_SEQUENCE;
2616 }else {
2617 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid code sequence for delegate creation at 0x%04x", ctx->ip_offset));
2618 }
2619 ctx->code [ip_offset].flags |= IL_CODE_DELEGATE_SEQUENCE;
2620
2621 //general tests
2622 if (is_first_arg_bound) {
2623 if (mono_method_signature (method)->param_count == 0 || !verify_stack_type_compatibility_full (ctx, mono_method_signature (method)->params [0], value, FALSE, TRUE))
2624 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2625 } else {
2626 if (method->flags & METHOD_ATTRIBUTE_STATIC) {
2627 if (!stack_slot_is_null_literal (value) && !is_first_arg_bound)
2628 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Non-null this args used with static function for delegate creation at 0x%04x", ctx->ip_offset));
2629 } else {
2630 if (!verify_stack_type_compatibility_full (ctx, &method->klass->byval_arg, value, FALSE, TRUE) && !stack_slot_is_null_literal (value))
2631 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2632 }
2633 }
2634
2635 if (stack_slot_get_type (value) != TYPE_COMPLEX)
2636 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid first parameter for delegate creation at 0x%04x", ctx->ip_offset));
2637
2638 #undef IS_VALID_OPCODE
2639 #undef IS_LOAD_FUN_PTR
2640 }
2641
2642 /* implement the opcode checks*/
2643 static void
2644 push_arg (VerifyContext *ctx, unsigned int arg, int take_addr)
2645 {
2646 ILStackDesc *top;
2647
2648 if (arg >= ctx->max_args) {
2649 if (take_addr)
2650 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
2651 else {
2652 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
2653 if (check_overflow (ctx)) //FIXME: what sane value could we ever push?
2654 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
2655 }
2656 } else if (check_overflow (ctx)) {
2657 /*We must let the value be pushed, otherwise we would get an underflow error*/
2658 check_unverifiable_type (ctx, ctx->params [arg]);
2659 if (ctx->params [arg]->byref && take_addr)
2660 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
2661 top = stack_push (ctx);
2662 if (!set_stack_value (ctx, top, ctx->params [arg], take_addr))
2663 return;
2664
2665 if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC)) {
2666 if (take_addr)
2667 ctx->has_this_store = TRUE;
2668 else
2669 top->stype |= THIS_POINTER_MASK;
2670 if (mono_method_is_constructor (ctx->method) && !ctx->super_ctor_called && !ctx->method->klass->valuetype)
2671 top->stype |= UNINIT_THIS_MASK;
2672 }
2673 }
2674 }
2675
2676 static void
2677 push_local (VerifyContext *ctx, guint32 arg, int take_addr)
2678 {
2679 if (arg >= ctx->num_locals) {
2680 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local %d", arg + 1));
2681 } else if (check_overflow (ctx)) {
2682 /*We must let the value be pushed, otherwise we would get an underflow error*/
2683 check_unverifiable_type (ctx, ctx->locals [arg]);
2684 if (ctx->locals [arg]->byref && take_addr)
2685 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
2686
2687 set_stack_value (ctx, stack_push (ctx), ctx->locals [arg], take_addr);
2688 }
2689 }
2690
2691 static void
2692 store_arg (VerifyContext *ctx, guint32 arg)
2693 {
2694 ILStackDesc *value;
2695
2696 if (arg >= ctx->max_args) {
2697 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d at 0x%04x", arg + 1, ctx->ip_offset));
2698 if (check_underflow (ctx, 1))
2699 stack_pop (ctx);
2700 return;
2701 }
2702
2703 if (check_underflow (ctx, 1)) {
2704 value = stack_pop (ctx);
2705 if (!verify_stack_type_compatibility (ctx, ctx->params [arg], value)) {
2706 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in argument store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
2707 }
2708 }
2709 if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC))
2710 ctx->has_this_store = 1;
2711 }
2712
2713 static void
2714 store_local (VerifyContext *ctx, guint32 arg)
2715 {
2716 ILStackDesc *value;
2717 if (arg >= ctx->num_locals) {
2718 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local var %d at 0x%04x", arg + 1, ctx->ip_offset));
2719 return;
2720 }
2721
2722 /*TODO verify definite assigment */
2723 if (check_underflow (ctx, 1)) {
2724 value = stack_pop(ctx);
2725 if (!verify_stack_type_compatibility (ctx, ctx->locals [arg], value)) {
2726 char *expected = mono_type_full_name (ctx->locals [arg]);
2727 char *found = stack_slot_full_name (value);
2728 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type '%s' on stack cannot be stored to local %d with type '%s' at 0x%04x",
2729 found,
2730 arg,
2731 expected,
2732 ctx->ip_offset));
2733 g_free (expected);
2734 g_free (found);
2735 }
2736 }
2737 }
2738
2739 /*FIXME add and sub needs special care here*/
2740 static void
2741 do_binop (VerifyContext *ctx, unsigned int opcode, const unsigned char table [TYPE_MAX][TYPE_MAX])
2742 {
2743 ILStackDesc *a, *b, *top;
2744 int idxa, idxb, complexMerge = 0;
2745 unsigned char res;
2746
2747 if (!check_underflow (ctx, 2))
2748 return;
2749 b = stack_pop (ctx);
2750 a = stack_pop (ctx);
2751
2752 idxa = stack_slot_get_underlying_type (a);
2753 if (stack_slot_is_managed_pointer (a)) {
2754 idxa = TYPE_PTR;
2755 complexMerge = 1;
2756 }
2757
2758 idxb = stack_slot_get_underlying_type (b);
2759 if (stack_slot_is_managed_pointer (b)) {
2760 idxb = TYPE_PTR;
2761 complexMerge = 2;
2762 }
2763
2764 --idxa;
2765 --idxb;
2766 res = table [idxa][idxb];
2767
2768 VERIFIER_DEBUG ( printf ("binop res %d\n", res); );
2769 VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
2770
2771 top = stack_push (ctx);
2772 if (res == TYPE_INV) {
2773 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)));
2774 copy_stack_value (top, a);
2775 return;
2776 }
2777
2778 if (res & NON_VERIFIABLE_RESULT) {
2779 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)));
2780
2781 res = res & ~NON_VERIFIABLE_RESULT;
2782 }
2783
2784 if (complexMerge && res == TYPE_PTR) {
2785 if (complexMerge == 1)
2786 copy_stack_value (top, a);
2787 else if (complexMerge == 2)
2788 copy_stack_value (top, b);
2789 /*
2790 * There is no need to merge the type of two pointers.
2791 * The only valid operation is subtraction, that returns a native
2792 * int as result and can be used with any 2 pointer kinds.
2793 * This is valid acording to Patition III 1.1.4
2794 */
2795 } else
2796 top->stype = res;
2797
2798 }
2799
2800
2801 static void
2802 do_boolean_branch_op (VerifyContext *ctx, int delta)
2803 {
2804 int target = ctx->ip_offset + delta;
2805 ILStackDesc *top;
2806
2807 VERIFIER_DEBUG ( printf ("boolean branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
2808
2809 if (target < 0 || target >= ctx->code_size) {
2810 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Boolean branch target out of code at 0x%04x", ctx->ip_offset));
2811 return;
2812 }
2813
2814 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
2815 case 1:
2816 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
2817 break;
2818 case 2:
2819 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
2820 return;
2821 }
2822
2823 ctx->target = target;
2824
2825 if (!check_underflow (ctx, 1))
2826 return;
2827
2828 top = stack_pop (ctx);
2829 if (!is_valid_bool_arg (top))
2830 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));
2831
2832 check_unmanaged_pointer (ctx, top);
2833 }
2834
2835 static gboolean
2836 stack_slot_is_complex_type_not_reference_type (ILStackDesc *slot)
2837 {
2838 return stack_slot_get_type (slot) == TYPE_COMPLEX && !MONO_TYPE_IS_REFERENCE (slot->type) && !stack_slot_is_boxed_value (slot);
2839 }
2840
2841 static void
2842 do_branch_op (VerifyContext *ctx, signed int delta, const unsigned char table [TYPE_MAX][TYPE_MAX])
2843 {
2844 ILStackDesc *a, *b;
2845 int idxa, idxb;
2846 unsigned char res;
2847 int target = ctx->ip_offset + delta;
2848
2849 VERIFIER_DEBUG ( printf ("branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
2850
2851 if (target < 0 || target >= ctx->code_size) {
2852 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
2853 return;
2854 }
2855
2856 switch (is_valid_cmp_branch_instruction (ctx->header, ctx->ip_offset, target)) {
2857 case 1: /*FIXME use constants and not magic numbers.*/
2858 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
2859 break;
2860 case 2:
2861 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
2862 return;
2863 }
2864
2865 ctx->target = target;
2866
2867 if (!check_underflow (ctx, 2))
2868 return;
2869
2870 b = stack_pop (ctx);
2871 a = stack_pop (ctx);
2872
2873 idxa = stack_slot_get_underlying_type (a);
2874 if (stack_slot_is_managed_pointer (a))
2875 idxa = TYPE_PTR;
2876
2877 idxb = stack_slot_get_underlying_type (b);
2878 if (stack_slot_is_managed_pointer (b))
2879 idxb = TYPE_PTR;
2880
2881 if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
2882 res = TYPE_INV;
2883 } else {
2884 --idxa;
2885 --idxb;
2886 res = table [idxa][idxb];
2887 }
2888
2889 VERIFIER_DEBUG ( printf ("branch res %d\n", res); );
2890 VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
2891
2892 if (res == TYPE_INV) {
2893 CODE_NOT_VERIFIABLE (ctx,
2894 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));
2895 } else if (res & NON_VERIFIABLE_RESULT) {
2896 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));
2897 res = res & ~NON_VERIFIABLE_RESULT;
2898 }
2899 }
2900
2901 static void
2902 do_cmp_op (VerifyContext *ctx, const unsigned char table [TYPE_MAX][TYPE_MAX], guint32 opcode)
2903 {
2904 ILStackDesc *a, *b;
2905 int idxa, idxb;
2906 unsigned char res;
2907
2908 if (!check_underflow (ctx, 2))
2909 return;
2910 b = stack_pop (ctx);
2911 a = stack_pop (ctx);
2912
2913 if (opcode == CEE_CGT_UN) {
2914 if (stack_slot_get_type (a) == TYPE_COMPLEX && stack_slot_get_type (b) == TYPE_COMPLEX) {
2915 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
2916 return;
2917 }
2918 }
2919
2920 idxa = stack_slot_get_underlying_type (a);
2921 if (stack_slot_is_managed_pointer (a))
2922 idxa = TYPE_PTR;
2923
2924 idxb = stack_slot_get_underlying_type (b);
2925 if (stack_slot_is_managed_pointer (b))
2926 idxb = TYPE_PTR;
2927
2928 if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
2929 res = TYPE_INV;
2930 } else {
2931 --idxa;
2932 --idxb;
2933 res = table [idxa][idxb];
2934 }
2935
2936 if(res == TYPE_INV) {
2937 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));
2938 } else if (res & NON_VERIFIABLE_RESULT) {
2939 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));
2940 res = res & ~NON_VERIFIABLE_RESULT;
2941 }
2942 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
2943 }
2944
2945 static void
2946 do_ret (VerifyContext *ctx)
2947 {
2948 MonoType *ret = ctx->signature->ret;
2949 VERIFIER_DEBUG ( printf ("checking ret\n"); );
2950 if (ret->type != MONO_TYPE_VOID) {
2951 ILStackDesc *top;
2952 if (!check_underflow (ctx, 1))
2953 return;
2954
2955 top = stack_pop(ctx);
2956
2957 if (!verify_stack_type_compatibility (ctx, ctx->signature->ret, top)) {
2958 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible return value on stack with method signature ret at 0x%04x", ctx->ip_offset));
2959 return;
2960 }
2961
2962 if (ret->byref || ret->type == MONO_TYPE_TYPEDBYREF || mono_type_is_value_type (ret, "System", "ArgIterator") || mono_type_is_value_type (ret, "System", "RuntimeArgumentHandle"))
2963 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref, TypedReference, ArgIterator or RuntimeArgumentHandle at 0x%04x", ctx->ip_offset));
2964 }
2965
2966 if (ctx->eval.size > 0) {
2967 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack not empty (%d) after ret at 0x%04x", ctx->eval.size, ctx->ip_offset));
2968 }
2969 if (in_any_block (ctx->header, ctx->ip_offset))
2970 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ret cannot escape exception blocks at 0x%04x", ctx->ip_offset));
2971 }
2972
2973 /*
2974 * 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.
2975 * This is illegal but mono_get_method_full decoded it.
2976 * TODO handle calling .ctor outside one or calling the .ctor for other class but super
2977 */
2978 static void
2979 do_invoke_method (VerifyContext *ctx, int method_token, gboolean virtual)
2980 {
2981 int param_count, i;
2982 MonoMethodSignature *sig;
2983 ILStackDesc *value;
2984 MonoMethod *method;
2985 gboolean virt_check_this = FALSE;
2986 gboolean constrained = ctx->prefix_set & PREFIX_CONSTRAINED;
2987
2988 if (!(method = verifier_load_method (ctx, method_token, virtual ? "callvirt" : "call")))
2989 return;
2990
2991 if (virtual) {
2992 CLEAR_PREFIX (ctx, PREFIX_CONSTRAINED);
2993
2994 if (method->klass->valuetype) // && !constrained ???
2995 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with valuetype method at 0x%04x", ctx->ip_offset));
2996
2997 if ((method->flags & METHOD_ATTRIBUTE_STATIC))
2998 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with static method at 0x%04x", ctx->ip_offset));
2999
3000 } else {
3001 if (method->flags & METHOD_ATTRIBUTE_ABSTRACT)
3002 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use call with an abstract method at 0x%04x", ctx->ip_offset));
3003
3004 if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !(method->klass->flags & TYPE_ATTRIBUTE_SEALED)) {
3005 virt_check_this = TRUE;
3006 ctx->code [ctx->ip_offset].flags |= IL_CODE_CALL_NONFINAL_VIRTUAL;
3007 }
3008 }
3009
3010 if (!(sig = mono_method_get_signature_full (method, ctx->image, method_token, ctx->generic_context)))
3011 sig = mono_method_get_signature (method, ctx->image, method_token);
3012
3013 if (!sig) {
3014 char *name = mono_type_get_full_name (method->klass);
3015 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve signature of %s:%s at 0x%04x", name, method->name, ctx->ip_offset));
3016 g_free (name);
3017 return;
3018 }
3019
3020 param_count = sig->param_count + sig->hasthis;
3021 if (!check_underflow (ctx, param_count))
3022 return;
3023
3024 for (i = sig->param_count - 1; i >= 0; --i) {
3025 VERIFIER_DEBUG ( printf ("verifying argument %d\n", i); );
3026 value = stack_pop (ctx);
3027 if (!verify_stack_type_compatibility (ctx, sig->params[i], value)) {
3028 char *stack_name = stack_slot_full_name (value);
3029 char *sig_name = mono_type_full_name (sig->params [i]);
3030 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));
3031 g_free (stack_name);
3032 g_free (sig_name);
3033 }
3034
3035 if (stack_slot_is_managed_mutability_pointer (value))
3036 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));
3037
3038 if ((ctx->prefix_set & PREFIX_TAIL) && stack_slot_is_managed_pointer (value)) {
3039 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));
3040 return;
3041 }
3042 }
3043
3044 if (sig->hasthis) {
3045 MonoType *type = &method->klass->byval_arg;
3046 ILStackDesc copy;
3047
3048 if (mono_method_is_constructor (method) && !method->klass->valuetype) {
3049 if (!mono_method_is_constructor (ctx->method))
3050 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor outside one at 0x%04x", ctx->ip_offset));
3051 if (method->klass != ctx->method->klass->parent && method->klass != ctx->method->klass)
3052 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor to a type diferent that this or super at 0x%04x", ctx->ip_offset));
3053
3054 ctx->super_ctor_called = TRUE;
3055 value = stack_pop_safe (ctx);
3056 if ((value->stype & THIS_POINTER_MASK) != THIS_POINTER_MASK)
3057 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid 'this ptr' argument for constructor at 0x%04x", ctx->ip_offset));
3058 } else {
3059 value = stack_pop (ctx);
3060 }
3061
3062 copy_stack_value (&copy, value);
3063 //TODO we should extract this to a 'drop_byref_argument' and use everywhere
3064 //Other parts of the code suffer from the same issue of
3065 copy.type = mono_type_get_type_byval (copy.type);
3066 copy.stype &= ~POINTER_MASK;
3067
3068 if (virt_check_this && !stack_slot_is_this_pointer (value) && !(method->klass->valuetype || stack_slot_is_boxed_value (value)))
3069 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the call opcode with a non-final virtual method on an object diferent thant the this pointer at 0x%04x", ctx->ip_offset));
3070
3071 if (constrained && virtual) {
3072 if (!stack_slot_is_managed_pointer (value))
3073 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object is not a managed pointer for a constrained call at 0x%04x", ctx->ip_offset));
3074 if (!mono_metadata_type_equal_full (mono_type_get_type_byval (value->type), ctx->constrained_type, TRUE))
3075 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object not compatible with constrained type at 0x%04x", ctx->ip_offset));
3076 copy.stype |= BOXED_MASK;
3077 } else {
3078 if (stack_slot_is_managed_pointer (value) && !mono_class_from_mono_type (value->type)->valuetype)
3079 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));
3080
3081 if (!virtual && mono_class_from_mono_type (value->type)->valuetype && !method->klass->valuetype && !stack_slot_is_boxed_value (value))
3082 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a valuetype baseclass at 0x%04x", ctx->ip_offset));
3083
3084 if (virtual && mono_class_from_mono_type (value->type)->valuetype && !stack_slot_is_boxed_value (value))
3085 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a valuetype with callvirt at 0x%04x", ctx->ip_offset));
3086
3087 if (method->klass->valuetype && (stack_slot_is_boxed_value (value) || !stack_slot_is_managed_pointer (value)))
3088 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));
3089 }
3090 if (!verify_stack_type_compatibility (ctx, type, &copy)) {
3091 char *expected = mono_type_full_name (type);
3092 char *effective = stack_slot_full_name (&copy);
3093 char *method_name = mono_method_full_name (method, TRUE);
3094 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",
3095 expected, effective, method_name, ctx->ip_offset));
3096 g_free (method_name);
3097 g_free (effective);
3098 g_free (expected);
3099 }
3100
3101 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, mono_class_from_mono_type (value->type))) {
3102 char *name = mono_method_full_name (method, TRUE);
3103 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3104 g_free (name);
3105 }
3106
3107 } else if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
3108 char *name = mono_method_full_name (method, TRUE);
3109 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3110 g_free (name);
3111 }
3112
3113 if (sig->ret->type != MONO_TYPE_VOID) {
3114 if (!mono_type_is_valid_in_context (ctx, sig->ret))
3115 return;
3116
3117 if (check_overflow (ctx)) {
3118 value = stack_push (ctx);
3119 set_stack_value (ctx, value, sig->ret, FALSE);
3120 if ((ctx->prefix_set & PREFIX_READONLY) && method->klass->rank && !strcmp (method->name, "Address")) {
3121 ctx->prefix_set &= ~PREFIX_READONLY;
3122 value->stype |= CMMP_MASK;
3123 }
3124 }
3125 }
3126
3127 if ((ctx->prefix_set & PREFIX_TAIL)) {
3128 if (!mono_delegate_ret_equal (mono_method_signature (ctx->method)->ret, sig->ret))
3129 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call with incompatible return type at 0x%04x", ctx->ip_offset));
3130 if (ctx->header->code [ctx->ip_offset + 5] != CEE_RET)
3131 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call not followed by ret at 0x%04x", ctx->ip_offset));
3132 }
3133
3134 }
3135
3136 static void
3137 do_push_static_field (VerifyContext *ctx, int token, gboolean take_addr)
3138 {
3139 MonoClassField *field;
3140 MonoClass *klass;
3141 if (!check_overflow (ctx))
3142 return;
3143 if (!take_addr)
3144 CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3145
3146 if (!(field = verifier_load_field (ctx, token, &klass, take_addr ? "ldsflda" : "ldsfld")))
3147 return;
3148
3149 if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3150 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot load non static field at 0x%04x", ctx->ip_offset));
3151 return;
3152 }
3153 /*taking the address of initonly field only works from the static constructor */
3154 if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3155 !(field->parent == ctx->method->klass && (ctx->method->flags & (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_STATIC)) && !strcmp (".cctor", ctx->method->name)))
3156 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3157
3158 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3159 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3160
3161 set_stack_value (ctx, stack_push (ctx), field->type, take_addr);
3162 }
3163
3164 static void
3165 do_store_static_field (VerifyContext *ctx, int token) {
3166 MonoClassField *field;
3167 MonoClass *klass;
3168 ILStackDesc *value;
3169 CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3170
3171 if (!check_underflow (ctx, 1))
3172 return;
3173
3174 value = stack_pop (ctx);
3175
3176 if (!(field = verifier_load_field (ctx, token, &klass, "stsfld")))
3177 return;
3178
3179 if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3180 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot store non static field at 0x%04x", ctx->ip_offset));
3181 return;
3182 }
3183
3184 if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3185 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type in store static field at 0x%04x", ctx->ip_offset));
3186 return;
3187 }
3188
3189 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3190 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3191
3192 if (!verify_stack_type_compatibility (ctx, field->type, value)) {
3193 char *stack_name = stack_slot_full_name (value);
3194 char *field_name = mono_type_full_name (field->type);
3195 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type in static field store expected '%s' but found '%s' at 0x%04x",
3196 field_name, stack_name, ctx->ip_offset));
3197 g_free (field_name);
3198 g_free (stack_name);
3199 }
3200 }
3201
3202 static gboolean
3203 check_is_valid_type_for_field_ops (VerifyContext *ctx, int token, ILStackDesc *obj, MonoClassField **ret_field, const char *opcode)
3204 {
3205 MonoClassField *field;
3206 MonoClass *klass;
3207 gboolean is_pointer;
3208
3209 /*must be a reference type, a managed pointer, an unamanaged pointer, or a valuetype*/
3210 if (!(field = verifier_load_field (ctx, token, &klass, opcode)))
3211 return FALSE;
3212
3213 *ret_field = field;
3214 //the value on stack is going to be used as a pointer
3215 is_pointer = stack_slot_get_type (obj) == TYPE_PTR || (stack_slot_get_type (obj) == TYPE_NATIVE_INT && !get_stack_type (&field->parent->byval_arg));
3216
3217 if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3218 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type at 0x%04x", ctx->ip_offset));
3219 return FALSE;
3220 }
3221 g_assert (obj->type);
3222
3223 /*The value on the stack must be a subclass of the defining type of the field*/
3224 /* we need to check if we can load the field from the stack value*/
3225 if (is_pointer) {
3226 if (stack_slot_get_underlying_type (obj) == TYPE_NATIVE_INT)
3227 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Native int is not a verifiable type to reference a field at 0x%04x", ctx->ip_offset));
3228
3229 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3230 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3231 } else {
3232 if (!field->parent->valuetype && stack_slot_is_managed_pointer (obj))
3233 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));
3234
3235 /*a value type can be loaded from a value or a managed pointer, but not a boxed object*/
3236 if (field->parent->valuetype && stack_slot_is_boxed_value (obj))
3237 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));
3238
3239 if (!stack_slot_is_null_literal (obj) && !verify_stack_type_compatibility_full (ctx, &field->parent->byval_arg, obj, TRUE, FALSE)) {
3240 char *found = stack_slot_full_name (obj);
3241 char *expected = mono_type_full_name (&field->parent->byval_arg);
3242 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));
3243 g_free (found);
3244 g_free (expected);
3245 }
3246
3247 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, mono_class_from_mono_type (obj->type)))
3248 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3249 }
3250
3251 check_unmanaged_pointer (ctx, obj);
3252 return TRUE;
3253 }
3254
3255 static void
3256 do_push_field (VerifyContext *ctx, int token, gboolean take_addr)
3257 {
3258 ILStackDesc *obj;
3259 MonoClassField *field;
3260
3261 if (!take_addr)
3262 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3263
3264 if (!check_underflow (ctx, 1))
3265 return;
3266 obj = stack_pop_safe (ctx);
3267
3268 if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, take_addr ? "ldflda" : "ldfld"))
3269 return;
3270
3271 if (take_addr && field->parent->valuetype && !stack_slot_is_managed_pointer (obj))
3272 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a temporary value-type at 0x%04x", ctx->ip_offset));
3273
3274 if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3275 !(field->parent == ctx->method->klass && mono_method_is_constructor (ctx->method)))
3276 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3277
3278 set_stack_value (ctx, stack_push (ctx), field->type, take_addr);
3279 }
3280
3281 static void
3282 do_store_field (VerifyContext *ctx, int token)
3283 {
3284 ILStackDesc *value, *obj;
3285 MonoClassField *field;
3286 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3287
3288 if (!check_underflow (ctx, 2))
3289 return;
3290
3291 value = stack_pop (ctx);
3292 obj = stack_pop_safe (ctx);
3293
3294 if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, "stfld"))
3295 return;
3296
3297 if (!verify_stack_type_compatibility (ctx, field->type, value))
3298 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in field store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3299 }
3300
3301 /*TODO proper handle for Nullable<T>*/
3302 static void
3303 do_box_value (VerifyContext *ctx, int klass_token)
3304 {
3305 ILStackDesc *value;
3306 MonoType *type = get_boxable_mono_type (ctx, klass_token, "box");
3307 MonoClass *klass;
3308
3309 if (!type)
3310 return;
3311
3312 if (!check_underflow (ctx, 1))
3313 return;
3314
3315 value = stack_pop (ctx);
3316 /*box is a nop for reference types*/
3317
3318 if (stack_slot_get_underlying_type (value) == TYPE_COMPLEX && MONO_TYPE_IS_REFERENCE (value->type) && MONO_TYPE_IS_REFERENCE (type)) {
3319 stack_push_stack_val (ctx, value)->stype |= BOXED_MASK;
3320 return;
3321 }
3322
3323
3324 if (!verify_stack_type_compatibility (ctx, type, value))
3325 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for boxing operation at 0x%04x", ctx->ip_offset));
3326
3327 klass = mono_class_from_mono_type (type);
3328 if (mono_class_is_nullable (klass))
3329 type = &mono_class_get_nullable_param (klass)->byval_arg;
3330 stack_push_val (ctx, TYPE_COMPLEX | BOXED_MASK, type);
3331 }
3332
3333 static void
3334 do_unbox_value (VerifyContext *ctx, int klass_token)
3335 {
3336 ILStackDesc *value;
3337 MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox");
3338
3339 if (!type)
3340 return;
3341
3342 if (!check_underflow (ctx, 1))
3343 return;
3344
3345 if (!mono_class_from_mono_type (type)->valuetype)
3346 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid reference type for unbox at 0x%04x", ctx->ip_offset));
3347
3348 value = stack_pop (ctx);
3349
3350 /*Value should be: a boxed valuetype or a reference type*/
3351 if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3352 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3353 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));
3354
3355 set_stack_value (ctx, value = stack_push (ctx), mono_type_get_type_byref (type), FALSE);
3356 value->stype |= CMMP_MASK;
3357 }
3358
3359 static void
3360 do_unbox_any (VerifyContext *ctx, int klass_token)
3361 {
3362 ILStackDesc *value;
3363 MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox.any");
3364
3365 if (!type)
3366 return;
3367
3368 if (!check_underflow (ctx, 1))
3369 return;
3370
3371 value = stack_pop (ctx);
3372
3373 /*Value should be: a boxed valuetype or a reference type*/
3374 if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3375 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3376 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));
3377
3378 set_stack_value (ctx, stack_push (ctx), type, FALSE);
3379 }
3380
3381 static void
3382 do_unary_math_op (VerifyContext *ctx, int op)
3383 {
3384 ILStackDesc *value;
3385 if (!check_underflow (ctx, 1))
3386 return;
3387 value = stack_pop (ctx);
3388 switch (stack_slot_get_type (value)) {
3389 case TYPE_I4:
3390 case TYPE_I8:
3391 case TYPE_NATIVE_INT:
3392 break;
3393 case TYPE_R8:
3394 if (op == CEE_NEG)
3395 break;
3396 case TYPE_COMPLEX: /*only enums are ok*/
3397 if (mono_type_is_enum_type (value->type))
3398 break;
3399 default:
3400 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for unary not at 0x%04x", ctx->ip_offset));
3401 }
3402 stack_push_stack_val (ctx, value);
3403 }
3404
3405 static void
3406 do_conversion (VerifyContext *ctx, int kind)
3407 {
3408 ILStackDesc *value;
3409 if (!check_underflow (ctx, 1))
3410 return;
3411 value = stack_pop (ctx);
3412
3413 switch (stack_slot_get_type (value)) {
3414 case TYPE_I4:
3415 case TYPE_I8:
3416 case TYPE_NATIVE_INT:
3417 case TYPE_R8:
3418 break;
3419 default:
3420 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));
3421 }
3422
3423 switch (kind) {
3424 case TYPE_I4:
3425 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3426 break;
3427 case TYPE_I8:
3428 stack_push_val (ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
3429 break;
3430 case TYPE_R8:
3431 stack_push_val (ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
3432 break;
3433 case TYPE_NATIVE_INT:
3434 stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
3435 break;
3436 default:
3437 g_error ("unknown type %02x in conversion", kind);
3438
3439 }
3440 }
3441
3442 static void
3443 do_load_token (VerifyContext *ctx, int token)
3444 {
3445 gpointer handle;
3446 MonoClass *handle_class;
3447 if (!check_overflow (ctx))
3448 return;
3449
3450 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
3451 handle = mono_method_get_wrapper_data (ctx->method, token);
3452 handle_class = mono_method_get_wrapper_data (ctx->method, token + 1);
3453 if (handle_class == mono_defaults.typehandle_class)
3454 handle = &((MonoClass*)handle)->byval_arg;
3455 } else {
3456 switch (token & 0xff000000) {
3457 case MONO_TOKEN_TYPE_DEF:
3458 case MONO_TOKEN_TYPE_REF:
3459 case MONO_TOKEN_TYPE_SPEC:
3460 case MONO_TOKEN_FIELD_DEF:
3461 case MONO_TOKEN_METHOD_DEF:
3462 case MONO_TOKEN_METHOD_SPEC:
3463 case MONO_TOKEN_MEMBER_REF:
3464 if (!token_bounds_check (ctx->image, token)) {
3465 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));
3466 return;
3467 }
3468 break;
3469 default:
3470 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));
3471 return;
3472 }
3473
3474 handle = mono_ldtoken (ctx->image, token, &handle_class, ctx->generic_context);
3475 }
3476
3477 if (!handle) {
3478 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid token 0x%x for ldtoken at 0x%04x", token, ctx->ip_offset));
3479 return;
3480 }
3481 if (handle_class == mono_defaults.typehandle_class) {
3482 mono_type_is_valid_in_context (ctx, (MonoType*)handle);
3483 } else if (handle_class == mono_defaults.methodhandle_class) {
3484 mono_method_is_valid_in_context (ctx, (MonoMethod*)handle);
3485 } else if (handle_class == mono_defaults.fieldhandle_class) {
3486 mono_type_is_valid_in_context (ctx, &((MonoClassField*)handle)->parent->byval_arg);
3487 } else {
3488 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid ldtoken type %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
3489 }
3490 stack_push_val (ctx, TYPE_COMPLEX, mono_class_get_type (handle_class));
3491 }
3492
3493 static void
3494 do_ldobj_value (VerifyContext *ctx, int token)
3495 {
3496 ILStackDesc *value;
3497 MonoType *type = get_boxable_mono_type (ctx, token, "ldobj");
3498 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3499
3500 if (!type)
3501 return;
3502
3503 if (!check_underflow (ctx, 1))
3504 return;
3505
3506 value = stack_pop (ctx);
3507 if (!stack_slot_is_managed_pointer (value)
3508 && stack_slot_get_type (value) != TYPE_NATIVE_INT
3509 && !(stack_slot_get_type (value) == TYPE_PTR && value->type->type != MONO_TYPE_FNPTR)) {
3510 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid argument %s to ldobj at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3511 return;
3512 }
3513
3514 if (stack_slot_get_type (value) == TYPE_NATIVE_INT)
3515 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Using native pointer to ldobj at 0x%04x", ctx->ip_offset));
3516
3517 /*We have a byval on the stack, but the comparison must be strict. */
3518 if (!verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (value->type), TRUE))
3519 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldojb operation at 0x%04x", ctx->ip_offset));
3520
3521 set_stack_value (ctx, stack_push (ctx), type, FALSE);
3522 }
3523
3524 static void
3525 do_stobj (VerifyContext *ctx, int token)
3526 {
3527 ILStackDesc *dest, *src;
3528 MonoType *type = get_boxable_mono_type (ctx, token, "stobj");
3529 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3530
3531 if (!type)
3532 return;
3533
3534 if (!check_underflow (ctx, 2))
3535 return;
3536
3537 src = stack_pop (ctx);
3538 dest = stack_pop (ctx);
3539
3540 if (stack_slot_is_managed_mutability_pointer (dest))
3541 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stobj at 0x%04x", ctx->ip_offset));
3542
3543 if (!stack_slot_is_managed_pointer (dest))
3544 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of stobj operation at 0x%04x", ctx->ip_offset));
3545
3546 if (stack_slot_is_boxed_value (src) && !MONO_TYPE_IS_REFERENCE (src->type) && !MONO_TYPE_IS_REFERENCE (type))
3547 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));
3548
3549 if (!verify_stack_type_compatibility (ctx, type, src)) {
3550 char *type_name = mono_type_full_name (type);
3551 char *src_name = stack_slot_full_name (src);
3552 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));
3553 g_free (type_name);
3554 g_free (src_name);
3555 }
3556
3557 if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3558 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of stobj don't match at 0x%04x", ctx->ip_offset));
3559 }
3560
3561 static void
3562 do_cpobj (VerifyContext *ctx, int token)
3563 {
3564 ILStackDesc *dest, *src;
3565 MonoType *type = get_boxable_mono_type (ctx, token, "cpobj");
3566 if (!type)
3567 return;
3568
3569 if (!check_underflow (ctx, 2))
3570 return;
3571
3572 src = stack_pop (ctx);
3573 dest = stack_pop (ctx);
3574
3575 if (!stack_slot_is_managed_pointer (src))
3576 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid source of cpobj operation at 0x%04x", ctx->ip_offset));
3577
3578 if (!stack_slot_is_managed_pointer (dest))
3579 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of cpobj operation at 0x%04x", ctx->ip_offset));
3580
3581 if (stack_slot_is_managed_mutability_pointer (dest))
3582 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with cpobj at 0x%04x", ctx->ip_offset));
3583
3584 if (!verify_type_compatibility (ctx, type, mono_type_get_type_byval (src->type)))
3585 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token and source types of cpobj don't match at 0x%04x", ctx->ip_offset));
3586
3587 if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3588 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of cpobj don't match at 0x%04x", ctx->ip_offset));
3589 }
3590
3591 static void
3592 do_initobj (VerifyContext *ctx, int token)
3593 {
3594 ILStackDesc *obj;
3595 MonoType *stack, *type = get_boxable_mono_type (ctx, token, "initobj");
3596 if (!type)
3597 return;
3598
3599 if (!check_underflow (ctx, 1))
3600 return;
3601
3602 obj = stack_pop (ctx);
3603
3604 if (!stack_slot_is_managed_pointer (obj))
3605 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object address for initobj at 0x%04x", ctx->ip_offset));
3606
3607 if (stack_slot_is_managed_mutability_pointer (obj))
3608 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with initobj at 0x%04x", ctx->ip_offset));
3609
3610 stack = mono_type_get_type_byval (obj->type);
3611 if (MONO_TYPE_IS_REFERENCE (stack)) {
3612 if (!verify_type_compatibility (ctx, stack, type))
3613 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3614 else if (IS_STRICT_MODE (ctx) && !mono_metadata_type_equal (type, stack))
3615 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3616 } else if (!verify_type_compatibility (ctx, stack, type)) {
3617 char *expected_name = mono_type_full_name (type);
3618 char *stack_name = mono_type_full_name (stack);
3619
3620 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));
3621 g_free (expected_name);
3622 g_free (stack_name);
3623 }
3624 }
3625
3626 static void
3627 do_newobj (VerifyContext *ctx, int token)
3628 {
3629 ILStackDesc *value;
3630 int i;
3631 MonoMethodSignature *sig;
3632 MonoMethod *method;
3633 gboolean is_delegate = FALSE;
3634
3635 if (!(method = verifier_load_method (ctx, token, "newobj")))
3636 return;
3637
3638 if (!mono_method_is_constructor (method)) {
3639 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method from token 0x%08x not a constructor at 0x%04x", token, ctx->ip_offset));
3640 return;
3641 }
3642
3643 if (method->klass->flags & (TYPE_ATTRIBUTE_ABSTRACT | TYPE_ATTRIBUTE_INTERFACE))
3644 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Trying to instantiate an abstract or interface type at 0x%04x", ctx->ip_offset));
3645
3646 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
3647 char *from = mono_method_full_name (ctx->method, TRUE);
3648 char *to = mono_method_full_name (method, TRUE);
3649 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);
3650 g_free (from);
3651 g_free (to);
3652 }
3653
3654 //FIXME use mono_method_get_signature_full
3655 sig = mono_method_signature (method);
3656 if (!sig) {
3657 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature to newobj at 0x%04x", ctx->ip_offset));
3658 return;
3659 }
3660
3661 if (!sig->hasthis) {
3662 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature missing hasthis at 0x%04x", ctx->ip_offset));
3663 return;
3664 }
3665
3666 if (!check_underflow (ctx, sig->param_count))
3667 return;
3668
3669 is_delegate = method->klass->parent == mono_defaults.multicastdelegate_class;
3670
3671 if (is_delegate) {
3672 ILStackDesc *funptr;
3673 //first arg is object, second arg is fun ptr
3674 if (sig->param_count != 2) {
3675 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid delegate constructor at 0x%04x", ctx->ip_offset));
3676 return;
3677 }
3678 funptr = stack_pop (ctx);
3679 value = stack_pop (ctx);
3680 verify_delegate_compatibility (ctx, method->klass, value, funptr);
3681 } else {
3682 for (i = sig->param_count - 1; i >= 0; --i) {
3683 VERIFIER_DEBUG ( printf ("verifying constructor argument %d\n", i); );
3684 value = stack_pop (ctx);
3685 if (!verify_stack_type_compatibility (ctx, sig->params [i], value)) {
3686 char *stack_name = stack_slot_full_name (value);
3687 char *sig_name = mono_type_full_name (sig->params [i]);
3688 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));
3689 g_free (stack_name);
3690 g_free (sig_name);
3691 }
3692
3693 if (stack_slot_is_managed_mutability_pointer (value))
3694 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of newobj at 0x%04x", ctx->ip_offset));
3695 }
3696 }
3697
3698 if (check_overflow (ctx))
3699 set_stack_value (ctx, stack_push (ctx), &method->klass->byval_arg, FALSE);
3700 }
3701
3702 static void
3703 do_cast (VerifyContext *ctx, int token, const char *opcode) {
3704 ILStackDesc *value;
3705 MonoType *type;
3706 gboolean is_boxed;
3707 gboolean do_box;
3708
3709 if (!check_underflow (ctx, 1))
3710 return;
3711
3712 if (!(type = get_boxable_mono_type (ctx, token, opcode)))
3713 return;
3714
3715 if (type->byref) {
3716 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid %s type at 0x%04x", opcode, ctx->ip_offset));
3717 return;
3718 }
3719
3720 value = stack_pop (ctx);
3721 is_boxed = stack_slot_is_boxed_value (value);
3722
3723 if (stack_slot_is_managed_pointer (value))
3724 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
3725 else if (!MONO_TYPE_IS_REFERENCE (value->type) && !is_boxed) {
3726 char *name = stack_slot_full_name (value);
3727 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));
3728 g_free (name);
3729 }
3730
3731 switch (value->type->type) {
3732 case MONO_TYPE_FNPTR:
3733 case MONO_TYPE_PTR:
3734 case MONO_TYPE_TYPEDBYREF:
3735 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
3736 }
3737
3738 do_box = is_boxed || mono_type_is_generic_argument(type) || mono_class_from_mono_type (type)->valuetype;
3739 stack_push_val (ctx, TYPE_COMPLEX | (do_box ? BOXED_MASK : 0), type);
3740 }
3741
3742 static MonoType *
3743 mono_type_from_opcode (int opcode) {
3744 switch (opcode) {
3745 case CEE_LDIND_I1:
3746 case CEE_LDIND_U1:
3747 case CEE_STIND_I1:
3748 case CEE_LDELEM_I1:
3749 case CEE_LDELEM_U1:
3750 case CEE_STELEM_I1:
3751 return &mono_defaults.sbyte_class->byval_arg;
3752
3753 case CEE_LDIND_I2:
3754 case CEE_LDIND_U2:
3755 case CEE_STIND_I2:
3756 case CEE_LDELEM_I2:
3757 case CEE_LDELEM_U2:
3758 case CEE_STELEM_I2:
3759 return &mono_defaults.int16_class->byval_arg;
3760
3761 case CEE_LDIND_I4:
3762 case CEE_LDIND_U4:
3763 case CEE_STIND_I4:
3764 case CEE_LDELEM_I4:
3765 case CEE_LDELEM_U4:
3766 case CEE_STELEM_I4:
3767 return &mono_defaults.int32_class->byval_arg;
3768
3769 case CEE_LDIND_I8:
3770 case CEE_STIND_I8:
3771 case CEE_LDELEM_I8:
3772 case CEE_STELEM_I8:
3773 return &mono_defaults.int64_class->byval_arg;
3774
3775 case CEE_LDIND_R4:
3776 case CEE_STIND_R4:
3777 case CEE_LDELEM_R4:
3778 case CEE_STELEM_R4:
3779 return &mono_defaults.single_class->byval_arg;
3780
3781 case CEE_LDIND_R8:
3782 case CEE_STIND_R8:
3783 case CEE_LDELEM_R8:
3784 case CEE_STELEM_R8:
3785 return &mono_defaults.double_class->byval_arg;
3786
3787 case CEE_LDIND_I:
3788 case CEE_STIND_I:
3789 case CEE_LDELEM_I:
3790 case CEE_STELEM_I:
3791 return &mono_defaults.int_class->byval_arg;
3792
3793 case CEE_LDIND_REF:
3794 case CEE_STIND_REF:
3795 case CEE_LDELEM_REF:
3796 case CEE_STELEM_REF:
3797 return &mono_defaults.object_class->byval_arg;
3798
3799 default:
3800 g_error ("unknown opcode %02x in mono_type_from_opcode ", opcode);
3801 return NULL;
3802 }
3803 }
3804
3805 static void
3806 do_load_indirect (VerifyContext *ctx, int opcode)
3807 {
3808 ILStackDesc *value;
3809 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3810
3811 if (!check_underflow (ctx, 1))
3812 return;
3813
3814 value = stack_pop (ctx);
3815 if (!stack_slot_is_managed_pointer (value)) {
3816 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Load indirect not using a manager pointer at 0x%04x", ctx->ip_offset));
3817 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
3818 return;
3819 }
3820
3821 if (opcode == CEE_LDIND_REF) {
3822 if (stack_slot_get_underlying_type (value) != TYPE_COMPLEX || mono_class_from_mono_type (value->type)->valuetype)
3823 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind_ref expected object byref operation at 0x%04x", ctx->ip_offset));
3824 set_stack_value (ctx, stack_push (ctx), mono_type_get_type_byval (value->type), FALSE);
3825 } else {
3826 if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (value->type), TRUE))
3827 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
3828 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
3829 }
3830 }
3831
3832 static void
3833 do_store_indirect (VerifyContext *ctx, int opcode)
3834 {
3835 ILStackDesc *addr, *val;
3836 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3837
3838 if (!check_underflow (ctx, 2))
3839 return;
3840
3841 val = stack_pop (ctx);
3842 addr = stack_pop (ctx);
3843
3844 check_unmanaged_pointer (ctx, addr);
3845
3846 if (!stack_slot_is_managed_pointer (addr) && stack_slot_get_type (addr) != TYPE_PTR) {
3847 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid non-pointer argument to stind at 0x%04x", ctx->ip_offset));
3848 return;
3849 }
3850
3851 if (stack_slot_is_managed_mutability_pointer (addr)) {
3852 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stind at 0x%04x", ctx->ip_offset));
3853 return;
3854 }
3855
3856 if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (addr->type), TRUE))
3857 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid addr type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
3858
3859 if (!verify_stack_type_compatibility (ctx, mono_type_from_opcode (opcode), val))
3860 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
3861 }
3862
3863 static void
3864 do_newarr (VerifyContext *ctx, int token)
3865 {
3866 ILStackDesc *value;
3867 MonoType *type = get_boxable_mono_type (ctx, token, "newarr");
3868
3869 if (!type)
3870 return;
3871
3872 if (!check_underflow (ctx, 1))
3873 return;
3874
3875 value = stack_pop (ctx);
3876 if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
3877 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));
3878
3879 set_stack_value (ctx, stack_push (ctx), mono_class_get_type (mono_array_class_get (mono_class_from_mono_type (type), 1)), FALSE);
3880 }
3881
3882 /*FIXME handle arrays that are not 0-indexed*/
3883 static void
3884 do_ldlen (VerifyContext *ctx)
3885 {
3886 ILStackDesc *value;
3887
3888 if (!check_underflow (ctx, 1))
3889 return;
3890
3891 value = stack_pop (ctx);
3892
3893 if (stack_slot_get_type (value) != TYPE_COMPLEX || value->type->type != MONO_TYPE_SZARRAY)
3894 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type for ldlen at 0x%04x", ctx->ip_offset));
3895
3896 stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
3897 }
3898
3899 /*FIXME handle arrays that are not 0-indexed*/
3900 /*FIXME handle readonly prefix and CMMP*/
3901 static void
3902 do_ldelema (VerifyContext *ctx, int klass_token)
3903 {
3904 ILStackDesc *index, *array, *res;
3905 MonoType *type = get_boxable_mono_type (ctx, klass_token, "ldelema");
3906 gboolean valid;
3907
3908 if (!type)
3909 return;
3910
3911 if (!check_underflow (ctx, 2))
3912 return;
3913
3914 index = stack_pop (ctx);
3915 array = stack_pop (ctx);
3916
3917 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
3918 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));
3919
3920 if (!stack_slot_is_null_literal (array)) {
3921 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
3922 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelema at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
3923 else {
3924 if (get_stack_type (type) == TYPE_I4 || get_stack_type (type) == TYPE_NATIVE_INT) {
3925 valid = verify_type_compatibility_full (ctx, type, &array->type->data.klass->byval_arg, TRUE);
3926 } else {
3927 valid = mono_metadata_type_equal (type, &array->type->data.klass->byval_arg);
3928 }
3929 if (!valid)
3930 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelema at 0x%04x", ctx->ip_offset));
3931 }
3932 }
3933
3934 res = stack_push (ctx);
3935 set_stack_value (ctx, res, type, TRUE);
3936 if (ctx->prefix_set & PREFIX_READONLY) {
3937 ctx->prefix_set &= ~PREFIX_READONLY;
3938 res->stype |= CMMP_MASK;
3939 }
3940 }
3941
3942 /*
3943 * FIXME handle arrays that are not 0-indexed
3944 * FIXME handle readonly prefix and CMMP
3945 */
3946 static void
3947 do_ldelem (VerifyContext *ctx, int opcode, int token)
3948 {
3949 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
3950 ILStackDesc *index, *array;
3951 MonoType *type;
3952 if (!check_underflow (ctx, 2))
3953 return;
3954
3955 if (opcode == CEE_LDELEM) {
3956 if (!(type = verifier_load_type (ctx, token, "ldelem.any"))) {
3957 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
3958 return;
3959 }
3960 } else {
3961 type = mono_type_from_opcode (opcode);
3962 }
3963
3964 index = stack_pop (ctx);
3965 array = stack_pop (ctx);
3966
3967 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
3968 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));
3969
3970 if (!stack_slot_is_null_literal (array)) {
3971 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
3972 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));
3973 else {
3974 if (opcode == CEE_LDELEM_REF) {
3975 if (array->type->data.klass->valuetype)
3976 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for ldelem.ref 0x%04x", ctx->ip_offset));
3977 type = &array->type->data.klass->byval_arg;
3978 } else {
3979 MonoType *candidate = &array->type->data.klass->byval_arg;
3980 if (IS_STRICT_MODE (ctx)) {
3981 MonoType *underlying_type = mono_type_get_underlying_type_any (type);
3982 MonoType *underlying_candidate = mono_type_get_underlying_type_any (candidate);
3983 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)) ||
3984 (IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I, MONO_TYPE_U)))
3985 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
3986 }
3987 if (!verify_type_compatibility_full (ctx, type, candidate, TRUE))
3988 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
3989 }
3990 }
3991 }
3992
3993 set_stack_value (ctx, stack_push (ctx), type, FALSE);
3994 #undef IS_ONE_OF2
3995 }
3996
3997 /*
3998 * FIXME handle arrays that are not 0-indexed
3999 */
4000 static void
4001 do_stelem (VerifyContext *ctx, int opcode, int token)
4002 {
4003 ILStackDesc *index, *array, *value;
4004 MonoType *type;
4005 if (!check_underflow (ctx, 3))
4006 return;
4007
4008 if (opcode == CEE_STELEM) {
4009 if (!(type = verifier_load_type (ctx, token, "stelem.any"))) {
4010 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
4011 return;
4012 }
4013 } else {
4014 type = mono_type_from_opcode (opcode);
4015 }
4016
4017 value = stack_pop (ctx);
4018 index = stack_pop (ctx);
4019 array = stack_pop (ctx);
4020
4021 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4022 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));
4023
4024 if (!stack_slot_is_null_literal (array)) {
4025 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY) {
4026 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));
4027 } else {
4028 if (opcode == CEE_STELEM_REF) {
4029 if (array->type->data.klass->valuetype)
4030 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4031 } else if (!verify_type_compatibility_full (ctx, &array->type->data.klass->byval_arg, type, TRUE)) {
4032 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4033 }
4034 }
4035 }
4036 if (opcode == CEE_STELEM_REF) {
4037 if (!stack_slot_is_boxed_value (value) && mono_class_from_mono_type (value->type)->valuetype)
4038 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4039 } else if (opcode != CEE_STELEM_REF) {
4040 if (!verify_stack_type_compatibility (ctx, type, value))
4041 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4042
4043 if (stack_slot_is_boxed_value (value) && !MONO_TYPE_IS_REFERENCE (value->type) && !MONO_TYPE_IS_REFERENCE (type))
4044 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));
4045
4046 }
4047 }
4048
4049 static void
4050 do_throw (VerifyContext *ctx)
4051 {
4052 ILStackDesc *exception;
4053 if (!check_underflow (ctx, 1))
4054 return;
4055 exception = stack_pop (ctx);
4056
4057 if (!stack_slot_is_null_literal (exception) && !(stack_slot_get_type (exception) == TYPE_COMPLEX && !mono_class_from_mono_type (exception->type)->valuetype))
4058 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type at 0x%04x", ctx->ip_offset));
4059
4060 if (mono_type_is_generic_argument (exception->type) && !stack_slot_is_boxed_value (exception)) {
4061 char *name = mono_type_full_name (exception->type);
4062 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));
4063 g_free (name);
4064 }
4065 /*The stack is left empty after a throw*/
4066 ctx->eval.size = 0;
4067 }
4068
4069
4070 static void
4071 do_endfilter (VerifyContext *ctx)
4072 {
4073 MonoExceptionClause *clause;
4074
4075 if (IS_STRICT_MODE (ctx)) {
4076 if (ctx->eval.size != 1)
4077 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack size must have one item for endfilter at 0x%04x", ctx->ip_offset));
4078
4079 if (ctx->eval.size >= 1 && stack_slot_get_type (stack_pop (ctx)) != TYPE_I4)
4080 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack item type is not an int32 for endfilter at 0x%04x", ctx->ip_offset));
4081 }
4082
4083 if ((clause = is_correct_endfilter (ctx, ctx->ip_offset))) {
4084 if (IS_STRICT_MODE (ctx)) {
4085 if (ctx->ip_offset != clause->handler_offset - 2)
4086 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4087 } else {
4088 if ((ctx->ip_offset != clause->handler_offset - 2) && !MONO_OFFSET_IN_HANDLER (clause, ctx->ip_offset))
4089 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4090 }
4091 } else {
4092 if (IS_STRICT_MODE (ctx) && !is_unverifiable_endfilter (ctx, ctx->ip_offset))
4093 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4094 else
4095 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4096 }
4097
4098 ctx->eval.size = 0;
4099 }
4100
4101 static void
4102 do_leave (VerifyContext *ctx, int delta)
4103 {
4104 int target = ((gint32)ctx->ip_offset) + delta;
4105 if (target >= ctx->code_size || target < 0)
4106 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
4107
4108 if (!is_correct_leave (ctx->header, ctx->ip_offset, target))
4109 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Leave not allowed in finally block at 0x%04x", ctx->ip_offset));
4110 ctx->eval.size = 0;
4111 ctx->target = target;
4112 }
4113
4114 /*
4115 * do_static_branch:
4116 *
4117 * Verify br and br.s opcodes.
4118 */
4119 static void
4120 do_static_branch (VerifyContext *ctx, int delta)
4121 {
4122 int target = ctx->ip_offset + delta;
4123 if (target < 0 || target >= ctx->code_size) {
4124 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("branch target out of code at 0x%04x", ctx->ip_offset));
4125 return;
4126 }
4127
4128 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4129 case 1:
4130 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4131 break;
4132 case 2:
4133 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4134 break;
4135 }
4136
4137 ctx->target = target;
4138 }
4139
4140 static void
4141 do_switch (VerifyContext *ctx, int count, const unsigned char *data)
4142 {
4143 int i, base = ctx->ip_offset + 5 + count * 4;
4144 ILStackDesc *value;
4145
4146 if (!check_underflow (ctx, 1))
4147 return;
4148
4149 value = stack_pop (ctx);
4150
4151 if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
4152 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to switch at 0x%04x", ctx->ip_offset));
4153
4154 for (i = 0; i < count; ++i) {
4155 int target = base + read32 (data + i * 4);
4156
4157 if (target < 0 || target >= ctx->code_size) {
4158 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x out of code at 0x%04x", i, ctx->ip_offset));
4159 return;
4160 }
4161
4162 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4163 case 1:
4164 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4165 break;
4166 case 2:
4167 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4168 return;
4169 }
4170 merge_stacks (ctx, &ctx->eval, &ctx->code [target], FALSE, TRUE);
4171 }
4172 }
4173
4174 static void
4175 do_load_function_ptr (VerifyContext *ctx, guint32 token, gboolean virtual)
4176 {
4177 ILStackDesc *top;
4178 MonoMethod *method;
4179
4180 if (virtual && !check_underflow (ctx, 1))
4181 return;
4182
4183 if (!virtual && !check_overflow (ctx))
4184 return;
4185
4186 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
4187 method = mono_method_get_wrapper_data (ctx->method, (guint32)token);
4188 if (!method) {
4189 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4190 return;
4191 }
4192 } else {
4193 if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
4194 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4195 return;
4196 }
4197
4198 if (!(method = verifier_load_method (ctx, token, virtual ? "ldvirtfrn" : "ldftn")))
4199 return;
4200 }
4201
4202 if (mono_method_is_constructor (method))
4203 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldftn with a constructor at 0x%04x", ctx->ip_offset));
4204
4205 if (virtual) {
4206 ILStackDesc *top = stack_pop (ctx);
4207
4208 if (stack_slot_get_type (top) != TYPE_COMPLEX || top->type->type == MONO_TYPE_VALUETYPE)
4209 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to ldvirtftn at 0x%04x", ctx->ip_offset));
4210
4211 if (method->flags & METHOD_ATTRIBUTE_STATIC)
4212 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldvirtftn with a constructor at 0x%04x", ctx->ip_offset));
4213
4214 if (!verify_stack_type_compatibility (ctx, &method->klass->byval_arg, top))
4215 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unexpected object for ldvirtftn at 0x%04x", ctx->ip_offset));
4216 }
4217
4218 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL))
4219 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);
4220
4221 top = stack_push_val(ctx, TYPE_PTR, mono_type_create_fnptr_from_mono_method (ctx, method));
4222 top->method = method;
4223 }
4224
4225 static void
4226 do_sizeof (VerifyContext *ctx, int token)
4227 {
4228 MonoType *type;
4229
4230 if (!(type = verifier_load_type (ctx, token, "sizeof")))
4231 return;
4232
4233 if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
4234 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type at 0x%04x", ctx->ip_offset));
4235 return;
4236 }
4237
4238 if (type->type == MONO_TYPE_VOID) {
4239 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type at 0x%04x", ctx->ip_offset));
4240 return;
4241 }
4242
4243 if (check_overflow (ctx))
4244 set_stack_value (ctx, stack_push (ctx), &mono_defaults.uint32_class->byval_arg, FALSE);
4245 }
4246
4247 /* Stack top can be of any type, the runtime doesn't care and treat everything as an int. */
4248 static void
4249 do_localloc (VerifyContext *ctx)
4250 {
4251 ILStackDesc *top;
4252
4253 if (ctx->eval.size != 1) {
4254 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4255 return;
4256 }
4257
4258 if (in_any_exception_block (ctx->header, ctx->ip_offset)) {
4259 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4260 return;
4261 }
4262
4263 /*TODO verify top type*/
4264 top = stack_pop (ctx);
4265
4266 set_stack_value (ctx, stack_push (ctx), &mono_defaults.int_class->byval_arg, FALSE);
4267 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Instruction localloc in never verifiable at 0x%04x", ctx->ip_offset));
4268 }
4269
4270 static void
4271 do_ldstr (VerifyContext *ctx, guint32 token)
4272 {
4273 GSList *error = NULL;
4274 if (ctx->method->wrapper_type == MONO_WRAPPER_NONE && !ctx->image->dynamic) {
4275 if (mono_metadata_token_code (token) != MONO_TOKEN_STRING) {
4276 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string token %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4277 return;
4278 }
4279
4280 if (!mono_verifier_verify_string_signature (ctx->image, mono_metadata_token_index (token), &error)) {
4281 if (error)
4282 ctx->list = g_slist_concat (ctx->list, error);
4283 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string index %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4284 return;
4285 }
4286 }
4287
4288 if (check_overflow (ctx))
4289 stack_push_val (ctx, TYPE_COMPLEX, &mono_defaults.string_class->byval_arg);
4290 }
4291
4292 static void
4293 do_refanyval (VerifyContext *ctx, int token)
4294 {
4295 ILStackDesc *top;
4296 MonoType *type;
4297 if (!check_underflow (ctx, 1))
4298 return;
4299
4300 if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4301 return;
4302
4303 top = stack_pop (ctx);
4304
4305 if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4306 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));
4307
4308 set_stack_value (ctx, stack_push (ctx), type, TRUE);
4309 }
4310
4311 static void
4312 do_refanytype (VerifyContext *ctx)
4313 {
4314 ILStackDesc *top;
4315
4316 if (!check_underflow (ctx, 1))
4317 return;
4318
4319 top = stack_pop (ctx);
4320
4321 if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4322 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));
4323
4324 set_stack_value (ctx, stack_push (ctx), &mono_defaults.typehandle_class->byval_arg, FALSE);
4325
4326 }
4327
4328 static void
4329 do_mkrefany (VerifyContext *ctx, int token)
4330 {
4331 ILStackDesc *top;
4332 MonoType *type;
4333 if (!check_underflow (ctx, 1))
4334 return;
4335
4336 if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4337 return;
4338
4339 top = stack_pop (ctx);
4340
4341 if (stack_slot_is_managed_mutability_pointer (top))
4342 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with mkrefany at 0x%04x", ctx->ip_offset));
4343
4344 if (!stack_slot_is_managed_pointer (top)) {
4345 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));
4346 }else {
4347 MonoType *stack_type = mono_type_get_type_byval (top->type);
4348 if (MONO_TYPE_IS_REFERENCE (type) && !mono_metadata_type_equal (type, stack_type))
4349 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4350
4351 if (!MONO_TYPE_IS_REFERENCE (type) && !verify_type_compatibility_full (ctx, type, stack_type, TRUE))
4352 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4353 }
4354
4355 set_stack_value (ctx, stack_push (ctx), &mono_defaults.typed_reference_class->byval_arg, FALSE);
4356 }
4357
4358 static void
4359 do_ckfinite (VerifyContext *ctx)
4360 {
4361 ILStackDesc *top;
4362 if (!check_underflow (ctx, 1))
4363 return;
4364
4365 top = stack_pop (ctx);
4366
4367 if (stack_slot_get_underlying_type (top) != TYPE_R8)
4368 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));
4369 stack_push_stack_val (ctx, top);
4370 }
4371 /*
4372 * merge_stacks:
4373 * Merge the stacks and perform compat checks. The merge check if types of @from are mergeable with type of @to
4374 *
4375 * @from holds new values for a given control path
4376 * @to holds the current values of a given control path
4377 *
4378 * TODO we can eliminate the from argument as all callers pass &ctx->eval
4379 */
4380 static void
4381 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external)
4382 {
4383 MonoError error;
4384 int i, j, k;
4385 stack_init (ctx, to);
4386
4387 if (start) {
4388 if (to->flags == IL_CODE_FLAG_NOT_PROCESSED)
4389 from->size = 0;
4390 else
4391 stack_copy (&ctx->eval, to);
4392 goto end_verify;
4393 } else if (!(to->flags & IL_CODE_STACK_MERGED)) {
4394 stack_copy (to, &ctx->eval);
4395 goto end_verify;
4396 }
4397 VERIFIER_DEBUG ( printf ("performing stack merge %d x %d\n", from->size, to->size); );
4398
4399 if (from->size != to->size) {
4400 VERIFIER_DEBUG ( printf ("different stack sizes %d x %d at 0x%04x\n", from->size, to->size, ctx->ip_offset); );
4401 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));
4402 goto end_verify;
4403 }
4404
4405 //FIXME we need to preserve CMMP attributes
4406 //FIXME we must take null literals into consideration.
4407 for (i = 0; i < from->size; ++i) {
4408 ILStackDesc *new_slot = from->stack + i;
4409 ILStackDesc *old_slot = to->stack + i;
4410 MonoType *new_type = mono_type_from_stack_slot (new_slot);
4411 MonoType *old_type = mono_type_from_stack_slot (old_slot);
4412 MonoClass *old_class = mono_class_from_mono_type (old_type);
4413 MonoClass *new_class = mono_class_from_mono_type (new_type);
4414 MonoClass *match_class = NULL;
4415
4416 // S := T then U = S (new value is compatible with current value, keep current)
4417 if (verify_stack_type_compatibility (ctx, old_type, new_slot)) {
4418 copy_stack_value (new_slot, old_slot);
4419 continue;
4420 }
4421
4422 // T := S then U = T (old value is compatible with current value, use new)
4423 if (verify_stack_type_compatibility (ctx, new_type, old_slot)) {
4424 copy_stack_value (old_slot, new_slot);
4425 continue;
4426 }
4427
4428 if (mono_type_is_generic_argument (old_type) || mono_type_is_generic_argument (new_type)) {
4429 char *old_name = stack_slot_full_name (old_slot);
4430 char *new_name = stack_slot_full_name (new_slot);
4431 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));
4432 g_free (old_name);
4433 g_free (new_name);
4434 goto end_verify;
4435 }
4436
4437 //both are reference types, use closest common super type
4438 if (!mono_class_from_mono_type (old_type)->valuetype
4439 && !mono_class_from_mono_type (new_type)->valuetype
4440 && !stack_slot_is_managed_pointer (old_slot)
4441 && !stack_slot_is_managed_pointer (new_slot)) {
4442
4443 mono_class_setup_supertypes (old_class);
4444 mono_class_setup_supertypes (new_class);
4445
4446 for (j = MIN (old_class->idepth, new_class->idepth) - 1; j > 0; --j) {
4447 if (mono_metadata_type_equal (&old_class->supertypes [j]->byval_arg, &new_class->supertypes [j]->byval_arg)) {
4448 match_class = old_class->supertypes [j];
4449 goto match_found;
4450 }
4451 }
4452
4453 mono_class_setup_interfaces (old_class, &error);
4454 if (!mono_error_ok (&error)) {
4455 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));
4456 mono_error_cleanup (&error);
4457 goto end_verify;
4458 }
4459 for (j = 0; j < old_class->interface_count; ++j) {
4460 for (k = 0; k < new_class->interface_count; ++k) {
4461 if (mono_metadata_type_equal (&old_class->interfaces [j]->byval_arg, &new_class->interfaces [k]->byval_arg)) {
4462 match_class = old_class->interfaces [j];
4463 goto match_found;
4464 }
4465 }
4466 }
4467
4468 //No decent super type found, use object
4469 match_class = mono_defaults.object_class;
4470 goto match_found;
4471 } 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)) {
4472 match_class = mono_defaults.object_class;
4473 goto match_found;
4474 }
4475
4476 {
4477 char *old_name = stack_slot_full_name (old_slot);
4478 char *new_name = stack_slot_full_name (new_slot);
4479 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));
4480 g_free (old_name);
4481 g_free (new_name);
4482 }
4483 set_stack_value (ctx, old_slot, &new_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4484 goto end_verify;
4485
4486 match_found:
4487 g_assert (match_class);
4488 set_stack_value (ctx, old_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4489 set_stack_value (ctx, new_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4490 continue;
4491 }
4492
4493 end_verify:
4494 if (external)
4495 to->flags |= IL_CODE_FLAG_WAS_TARGET;
4496 to->flags |= IL_CODE_STACK_MERGED;
4497 }
4498
4499 #define HANDLER_START(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER ? (clause)->data.filter_offset : clause->handler_offset)
4500 #define IS_CATCH_OR_FILTER(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER || (clause)->flags == MONO_EXCEPTION_CLAUSE_NONE)
4501
4502 /*
4503 * is_clause_in_range :
4504 *
4505 * Returns TRUE if either the protected block or the handler of @clause is in the @start - @end range.
4506 */
4507 static gboolean
4508 is_clause_in_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4509 {
4510 if (clause->try_offset >= start && clause->try_offset < end)
4511 return TRUE;
4512 if (HANDLER_START (clause) >= start && HANDLER_START (clause) < end)
4513 return TRUE;
4514 return FALSE;
4515 }
4516
4517 /*
4518 * is_clause_inside_range :
4519 *
4520 * Returns TRUE if @clause lies completely inside the @start - @end range.
4521 */
4522 static gboolean
4523 is_clause_inside_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4524 {
4525 if (clause->try_offset < start || (clause->try_offset + clause->try_len) > end)
4526 return FALSE;
4527 if (HANDLER_START (clause) < start || (clause->handler_offset + clause->handler_len) > end)
4528 return FALSE;
4529 return TRUE;
4530 }
4531
4532 /*
4533 * is_clause_nested :
4534 *
4535 * Returns TRUE if @nested is nested in @clause.
4536 */
4537 static gboolean
4538 is_clause_nested (MonoExceptionClause *clause, MonoExceptionClause *nested)
4539 {
4540 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (nested, clause->data.filter_offset, clause->handler_offset))
4541 return TRUE;
4542 return is_clause_inside_range (nested, clause->try_offset, clause->try_offset + clause->try_len) ||
4543 is_clause_inside_range (nested, clause->handler_offset, clause->handler_offset + clause->handler_len);
4544 }
4545
4546 /* Test the relationship between 2 exception clauses. Follow P.1 12.4.2.7 of ECMA
4547 * the each pair of exception must have the following properties:
4548 * - one is fully nested on another (the outer must not be a filter clause) (the nested one must come earlier)
4549 * - completely disjoin (none of the 3 regions of each entry overlap with the other 3)
4550 * - mutual protection (protected block is EXACT the same, handlers are disjoin and all handler are catch or all handler are filter)
4551 */
4552 static void
4553 verify_clause_relationship (VerifyContext *ctx, MonoExceptionClause *clause, MonoExceptionClause *to_test)
4554 {
4555 /*clause is nested*/
4556 if (to_test->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (clause, to_test->data.filter_offset, to_test->handler_offset)) {
4557 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clause inside filter"));
4558 return;
4559 }
4560
4561 /*wrong nesting order.*/
4562 if (is_clause_nested (clause, to_test)) {
4563 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Nested exception clause appears after enclosing clause"));
4564 return;
4565 }
4566
4567 /*mutual protection*/
4568 if (clause->try_offset == to_test->try_offset && clause->try_len == to_test->try_len) {
4569 /*handlers are not disjoint*/
4570 if (is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) {
4571 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception handlers overlap"));
4572 return;
4573 }
4574 /* handlers are not catch or filter */
4575 if (!IS_CATCH_OR_FILTER (clause) || !IS_CATCH_OR_FILTER (to_test)) {
4576 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses with shared protected block are neither catch or filter"));
4577 return;
4578 }
4579 /*OK*/
4580 return;
4581 }
4582
4583 /*not completelly disjoint*/
4584 if ((is_clause_in_range (to_test, clause->try_offset, clause->try_offset + clause->try_len) ||
4585 is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) && !is_clause_nested (to_test, clause))
4586 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses overlap"));
4587 }
4588
4589 #define code_bounds_check(size) \
4590 if (ADDP_IS_GREATER_OR_OVF (ip, size, end)) {\
4591 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Code overrun starting with 0x%x at 0x%04x", *ip, ctx.ip_offset)); \
4592 break; \
4593 } \
4594
4595 static gboolean
4596 mono_opcode_is_prefix (int op)
4597 {
4598 switch (op) {
4599 case MONO_CEE_UNALIGNED_:
4600 case MONO_CEE_VOLATILE_:
4601 case MONO_CEE_TAIL_:
4602 case MONO_CEE_CONSTRAINED_:
4603 case MONO_CEE_READONLY_:
4604 return TRUE;
4605 }
4606 return FALSE;
4607 }
4608
4609 /*
4610 * FIXME: need to distinguish between valid and verifiable.
4611 * Need to keep track of types on the stack.
4612 * Verify types for opcodes.
4613 */
4614 GSList*
4615 mono_method_verify (MonoMethod *method, int level)
4616 {
4617 MonoError error;
4618 const unsigned char *ip, *code_start;
4619 const unsigned char *end;
4620 MonoSimpleBasicBlock *bb = NULL, *original_bb = NULL;
4621
4622 int i, n, need_merge = 0, start = 0;
4623 guint token, ip_offset = 0, prefix = 0;
4624 MonoGenericContext *generic_context = NULL;
4625 MonoImage *image;
4626 VerifyContext ctx;
4627 GSList *tmp;
4628 VERIFIER_DEBUG ( printf ("Verify IL for method %s %s %s\n", method->klass->name_space, method->klass->name, method->name); );
4629
4630 init_verifier_stats ();
4631
4632 if (method->iflags & (METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL | METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
4633 (method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))) {
4634 return NULL;
4635 }
4636
4637 memset (&ctx, 0, sizeof (VerifyContext));
4638
4639 //FIXME use mono_method_get_signature_full
4640 ctx.signature = mono_method_signature (method);
4641 if (!ctx.signature) {
4642 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method signature"));
4643
4644 finish_collect_stats ();
4645 return ctx.list;
4646 }
4647 if (!method->is_generic && !method->klass->is_generic && ctx.signature->has_type_parameters) {
4648 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Method and signature don't match in terms of genericity"));
4649 finish_collect_stats ();
4650 return ctx.list;
4651 }
4652
4653 ctx.header = mono_method_get_header (method);
4654 if (!ctx.header) {
4655 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method header"));
4656 finish_collect_stats ();
4657 return ctx.list;
4658 }
4659 ctx.method = method;
4660 code_start = ip = ctx.header->code;
4661 end = ip + ctx.header->code_size;
4662 ctx.image = image = method->klass->image;
4663
4664
4665 ctx.max_args = ctx.signature->param_count + ctx.signature->hasthis;
4666 ctx.max_stack = ctx.header->max_stack;
4667 ctx.verifiable = ctx.valid = 1;
4668 ctx.level = level;
4669
4670 ctx.code = g_new (ILCodeDesc, ctx.header->code_size);
4671 ctx.code_size = ctx.header->code_size;
4672 MEM_ALLOC (sizeof (ILCodeDesc) * ctx.header->code_size);
4673
4674 memset(ctx.code, 0, sizeof (ILCodeDesc) * ctx.header->code_size);
4675
4676 ctx.num_locals = ctx.header->num_locals;
4677 ctx.locals = g_memdup (ctx.header->locals, sizeof (MonoType*) * ctx.header->num_locals);
4678 MEM_ALLOC (sizeof (MonoType*) * ctx.header->num_locals);
4679
4680 if (ctx.num_locals > 0 && !ctx.header->init_locals)
4681 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Method with locals variable but without init locals set"));
4682
4683 ctx.params = g_new (MonoType*, ctx.max_args);
4684 MEM_ALLOC (sizeof (MonoType*) * ctx.max_args);
4685
4686 if (ctx.signature->hasthis)
4687 ctx.params [0] = method->klass->valuetype ? &method->klass->this_arg : &method->klass->byval_arg;
4688 memcpy (ctx.params + ctx.signature->hasthis, ctx.signature->params, sizeof (MonoType *) * ctx.signature->param_count);
4689
4690 if (ctx.signature->is_inflated)
4691 ctx.generic_context = generic_context = mono_method_get_context (method);
4692
4693 if (!generic_context && (method->klass->generic_container || method->is_generic)) {
4694 if (method->is_generic)
4695 ctx.generic_context = generic_context = &(mono_method_get_generic_container (method)->context);
4696 else
4697 ctx.generic_context = generic_context = &method->klass->generic_container->context;
4698 }
4699
4700 for (i = 0; i < ctx.num_locals; ++i) {
4701 MonoType *uninflated = ctx.locals [i];
4702 ctx.locals [i] = mono_class_inflate_generic_type_checked (ctx.locals [i], ctx.generic_context, &error);
4703 if (!mono_error_ok (&error)) {
4704 char *name = mono_type_full_name (ctx.locals [i] ? ctx.locals [i] : uninflated);
4705 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %d of type %s", i, name));
4706 g_free (name);
4707 mono_error_cleanup (&error);
4708 /* we must not free (in cleanup) what was not yet allocated (but only copied) */
4709 ctx.num_locals = i;
4710 ctx.max_args = 0;
4711 goto cleanup;
4712 }
4713 }
4714 for (i = 0; i < ctx.max_args; ++i) {
4715 MonoType *uninflated = ctx.params [i];
4716 ctx.params [i] = mono_class_inflate_generic_type_checked (ctx.params [i], ctx.generic_context, &error);
4717 if (!mono_error_ok (&error)) {
4718 char *name = mono_type_full_name (ctx.params [i] ? ctx.params [i] : uninflated);
4719 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %d of type %s", i, name));
4720 g_free (name);
4721 mono_error_cleanup (&error);
4722 /* we must not free (in cleanup) what was not yet allocated (but only copied) */
4723 ctx.max_args = i;
4724 goto cleanup;
4725 }
4726 }
4727 stack_init (&ctx, &ctx.eval);
4728
4729 for (i = 0; i < ctx.num_locals; ++i) {
4730 if (!mono_type_is_valid_in_context (&ctx, ctx.locals [i]))
4731 break;
4732 if (get_stack_type (ctx.locals [i]) == TYPE_INV) {
4733 char *name = mono_type_full_name (ctx.locals [i]);
4734 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %i of type %s", i, name));
4735 g_free (name);
4736 break;
4737 }
4738
4739 }
4740
4741 for (i = 0; i < ctx.max_args; ++i) {
4742 if (!mono_type_is_valid_in_context (&ctx, ctx.params [i]))
4743 break;
4744
4745 if (get_stack_type (ctx.params [i]) == TYPE_INV) {
4746 char *name = mono_type_full_name (ctx.params [i]);
4747 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %i of type %s", i, name));
4748 g_free (name);
4749 break;
4750 }
4751 }
4752
4753 if (!ctx.valid)
4754 goto cleanup;
4755
4756 for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
4757 MonoExceptionClause *clause = ctx.header->clauses + i;
4758 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); );
4759
4760 if (clause->try_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, ctx.code_size))
4761 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause out of bounds at 0x%04x", clause->try_offset));
4762
4763 if (clause->try_len <= 0)
4764 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause len <= 0 at 0x%04x", clause->try_offset));
4765
4766 if (clause->handler_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->handler_offset, clause->handler_len, ctx.code_size))
4767 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause out of bounds at 0x%04x", clause->try_offset));
4768
4769 if (clause->handler_len <= 0)
4770 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause len <= 0 at 0x%04x", clause->try_offset));
4771
4772 if (clause->try_offset < clause->handler_offset && ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, HANDLER_START (clause)))
4773 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try block (at 0x%04x) includes handler block (at 0x%04x)", clause->try_offset, clause->handler_offset));
4774
4775 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
4776 if (clause->data.filter_offset > ctx.code_size)
4777 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause out of bounds at 0x%04x", clause->try_offset));
4778
4779 if (clause->data.filter_offset >= clause->handler_offset)
4780 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause must come before the handler clause at 0x%04x", clause->data.filter_offset));
4781 }
4782
4783 for (n = i + 1; n < ctx.header->num_clauses && ctx.valid; ++n)
4784 verify_clause_relationship (&ctx, clause, ctx.header->clauses + n);
4785
4786 if (!ctx.valid)
4787 break;
4788
4789 ctx.code [clause->try_offset].flags |= IL_CODE_FLAG_WAS_TARGET;
4790 if (clause->try_offset + clause->try_len < ctx.code_size)
4791 ctx.code [clause->try_offset + clause->try_len].flags |= IL_CODE_FLAG_WAS_TARGET;
4792 if (clause->handler_offset + clause->handler_len < ctx.code_size)
4793 ctx.code [clause->handler_offset + clause->handler_len].flags |= IL_CODE_FLAG_WAS_TARGET;
4794
4795 if (clause->flags == MONO_EXCEPTION_CLAUSE_NONE) {
4796 if (!clause->data.catch_class) {
4797 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Catch clause %d with invalid type", i));
4798 break;
4799 }
4800
4801 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, clause->data.catch_class);
4802 }
4803 else if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
4804 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->data.filter_offset, mono_defaults.exception_class);
4805 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, mono_defaults.exception_class);
4806 }
4807 }
4808
4809 original_bb = bb = mono_basic_block_split (method, &error);
4810 if (!mono_error_ok (&error)) {
4811 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid branch target: %s", mono_error_get_message (&error)));
4812 mono_error_cleanup (&error);
4813 goto cleanup;
4814 }
4815 g_assert (bb);
4816
4817 while (ip < end && ctx.valid) {
4818 int op_size;
4819 ip_offset = ip - code_start;
4820 {
4821 const unsigned char *ip_copy = ip;
4822 int op;
4823
4824 if (ip_offset > bb->end) {
4825 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block at [0x%04x] targets middle instruction at 0x%04x", bb->end, ip_offset));
4826 goto cleanup;
4827 }
4828
4829 if (ip_offset == bb->end)
4830 bb = bb->next;
4831
4832 op_size = mono_opcode_value_and_size (&ip_copy, end, &op);
4833 if (op_size == -1) {
4834 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ip_offset));
4835 goto cleanup;
4836 }
4837
4838 if (ADD_IS_GREATER_OR_OVF (ip_offset, op_size, bb->end)) {
4839 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block targets middle of instruction at 0x%04x", ip_offset));
4840 goto cleanup;
4841 }
4842
4843 /*Last Instruction*/
4844 if (ip_offset + op_size == bb->end && mono_opcode_is_prefix (op)) {
4845 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));
4846 goto cleanup;
4847 }
4848 }
4849
4850 ctx.ip_offset = ip_offset = ip - code_start;
4851
4852 /*We need to check against fallthrou in and out of protected blocks.
4853 * For fallout we check the once a protected block ends, if the start flag is not set.
4854 * Likewise for fallthru in, we check if ip is the start of a protected block and start is not set
4855 * TODO convert these checks to be done using flags and not this loop
4856 */
4857 for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
4858 MonoExceptionClause *clause = ctx.header->clauses + i;
4859
4860 if ((clause->try_offset + clause->try_len == ip_offset) && start == 0) {
4861 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru off try block at 0x%04x", ip_offset));
4862 start = 1;
4863 }
4864
4865 if ((clause->handler_offset + clause->handler_len == ip_offset) && start == 0) {
4866 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER)
4867 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
4868 else
4869 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
4870 start = 1;
4871 }
4872
4873 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && clause->handler_offset == ip_offset && start == 0) {
4874 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of filter block at 0x%04x", ip_offset));
4875 start = 1;
4876 }
4877
4878 if (clause->handler_offset == ip_offset && start == 0) {
4879 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru handler block at 0x%04x", ip_offset));
4880 start = 1;
4881 }
4882
4883 if (clause->try_offset == ip_offset && ctx.eval.size > 0 && start == 0) {
4884 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Try to enter try block with a non-empty stack at 0x%04x", ip_offset));
4885 start = 1;
4886 }
4887 }
4888
4889 /*This must be done after fallthru detection otherwise it won't happen.*/
4890 if (bb->dead) {
4891 /*FIXME remove this once we move all bad branch checking code to use BB only*/
4892 ctx.code [ip_offset].flags |= IL_CODE_FLAG_SEEN;
4893 ip += op_size;
4894 continue;
4895 }
4896
4897 if (!ctx.valid)
4898 break;
4899
4900 if (need_merge) {
4901 VERIFIER_DEBUG ( printf ("extra merge needed! 0x%04x \n", ctx.target); );
4902 merge_stacks (&ctx, &ctx.eval, &ctx.code [ctx.target], FALSE, TRUE);
4903 need_merge = 0;
4904 }
4905 merge_stacks (&ctx, &ctx.eval, &ctx.code[ip_offset], start, FALSE);
4906 start = 0;
4907
4908 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
4909 #ifdef MONO_VERIFIER_DEBUG
4910 {
4911 char *discode;
4912 discode = mono_disasm_code_one (NULL, method, ip, NULL);
4913 discode [strlen (discode) - 1] = 0; /* no \n */
4914 g_print ("[%d] %-29s (%d)\n", ip_offset, discode, ctx.eval.size);
4915 g_free (discode);
4916 }
4917 dump_stack_state (&ctx.code [ip_offset]);
4918 dump_stack_state (&ctx.eval);
4919 #endif
4920
4921 switch (*ip) {
4922 case CEE_NOP:
4923 case CEE_BREAK:
4924 ++ip;
4925 break;
4926
4927 case CEE_LDARG_0:
4928 case CEE_LDARG_1:
4929 case CEE_LDARG_2:
4930 case CEE_LDARG_3:
4931 push_arg (&ctx, *ip - CEE_LDARG_0, FALSE);
4932 ++ip;
4933 break;
4934
4935 case CEE_LDARG_S:
4936 case CEE_LDARGA_S:
4937 code_bounds_check (2);
4938 push_arg (&ctx, ip [1], *ip == CEE_LDARGA_S);
4939 ip += 2;
4940 break;
4941
4942 case CEE_ADD_OVF_UN:
4943 do_binop (&ctx, *ip, add_ovf_un_table);
4944 ++ip;
4945 break;
4946
4947 case CEE_SUB_OVF_UN:
4948 do_binop (&ctx, *ip, sub_ovf_un_table);
4949 ++ip;
4950 break;
4951
4952 case CEE_ADD_OVF:
4953 case CEE_SUB_OVF:
4954 case CEE_MUL_OVF:
4955 case CEE_MUL_OVF_UN:
4956 do_binop (&ctx, *ip, bin_ovf_table);
4957 ++ip;
4958 break;
4959
4960 case CEE_ADD:
4961 do_binop (&ctx, *ip, add_table);
4962 ++ip;
4963 break;
4964
4965 case CEE_SUB:
4966 do_binop (&ctx, *ip, sub_table);
4967 ++ip;
4968 break;
4969
4970 case CEE_MUL:
4971 case CEE_DIV:
4972 case CEE_REM:
4973 do_binop (&ctx, *ip, bin_op_table);
4974 ++ip;
4975 break;
4976
4977 case CEE_AND:
4978 case CEE_DIV_UN:
4979 case CEE_OR:
4980 case CEE_REM_UN:
4981 case CEE_XOR:
4982 do_binop (&ctx, *ip, int_bin_op_table);
4983 ++ip;
4984 break;
4985
4986 case CEE_SHL:
4987 case CEE_SHR:
4988 case CEE_SHR_UN:
4989 do_binop (&ctx, *ip, shift_op_table);
4990 ++ip;
4991 break;
4992
4993 case CEE_POP:
4994 if (!check_underflow (&ctx, 1))
4995 break;
4996 stack_pop_safe (&ctx);
4997 ++ip;
4998 break;
4999
5000 case CEE_RET:
5001 do_ret (&ctx);
5002 ++ip;
5003 start = 1;
5004 break;
5005
5006 case CEE_LDLOC_0:
5007 case CEE_LDLOC_1:
5008 case CEE_LDLOC_2:
5009 case CEE_LDLOC_3:
5010 /*TODO support definite assignment verification? */
5011 push_local (&ctx, *ip - CEE_LDLOC_0, FALSE);
5012 ++ip;
5013 break;
5014
5015 case CEE_STLOC_0:
5016 case CEE_STLOC_1:
5017 case CEE_STLOC_2:
5018 case CEE_STLOC_3:
5019 store_local (&ctx, *ip - CEE_STLOC_0);
5020 ++ip;
5021 break;
5022
5023 case CEE_STLOC_S:
5024 code_bounds_check (2);
5025 store_local (&ctx, ip [1]);
5026 ip += 2;
5027 break;
5028
5029 case CEE_STARG_S:
5030 code_bounds_check (2);
5031 store_arg (&ctx, ip [1]);
5032 ip += 2;
5033 break;
5034
5035 case CEE_LDC_I4_M1:
5036 case CEE_LDC_I4_0:
5037 case CEE_LDC_I4_1:
5038 case CEE_LDC_I4_2:
5039 case CEE_LDC_I4_3:
5040 case CEE_LDC_I4_4:
5041 case CEE_LDC_I4_5:
5042 case CEE_LDC_I4_6:
5043 case CEE_LDC_I4_7:
5044 case CEE_LDC_I4_8:
5045 if (check_overflow (&ctx))
5046 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5047 ++ip;
5048 break;
5049
5050 case CEE_LDC_I4_S:
5051 code_bounds_check (2);
5052 if (check_overflow (&ctx))
5053 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5054 ip += 2;
5055 break;
5056
5057 case CEE_LDC_I4:
5058 code_bounds_check (5);
5059 if (check_overflow (&ctx))
5060 stack_push_val (&ctx,TYPE_I4, &mono_defaults.int32_class->byval_arg);
5061 ip += 5;
5062 break;
5063
5064 case CEE_LDC_I8:
5065 code_bounds_check (9);
5066 if (check_overflow (&ctx))
5067 stack_push_val (&ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
5068 ip += 9;
5069 break;
5070
5071 case CEE_LDC_R4:
5072 code_bounds_check (5);
5073 if (check_overflow (&ctx))
5074 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5075 ip += 5;
5076 break;
5077
5078 case CEE_LDC_R8:
5079 code_bounds_check (9);
5080 if (check_overflow (&ctx))
5081 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5082 ip += 9;
5083 break;
5084
5085 case CEE_LDNULL:
5086 if (check_overflow (&ctx))
5087 stack_push_val (&ctx, TYPE_COMPLEX | NULL_LITERAL_MASK, &mono_defaults.object_class->byval_arg);
5088 ++ip;
5089 break;
5090
5091 case CEE_BEQ_S:
5092 case CEE_BNE_UN_S:
5093 code_bounds_check (2);
5094 do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_eq_op);
5095 ip += 2;
5096 need_merge = 1;
5097 break;
5098
5099 case CEE_BGE_S:
5100 case CEE_BGT_S:
5101 case CEE_BLE_S:
5102 case CEE_BLT_S:
5103 case CEE_BGE_UN_S:
5104 case CEE_BGT_UN_S:
5105 case CEE_BLE_UN_S:
5106 case CEE_BLT_UN_S:
5107 code_bounds_check (2);
5108 do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_op);
5109 ip += 2;
5110 need_merge = 1;
5111 break;
5112
5113 case CEE_BEQ:
5114 case CEE_BNE_UN:
5115 code_bounds_check (5);
5116 do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_eq_op);
5117 ip += 5;
5118 need_merge = 1;
5119 break;
5120
5121 case CEE_BGE:
5122 case CEE_BGT:
5123 case CEE_BLE:
5124 case CEE_BLT:
5125 case CEE_BGE_UN:
5126 case CEE_BGT_UN:
5127 case CEE_BLE_UN:
5128 case CEE_BLT_UN:
5129 code_bounds_check (5);
5130 do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_op);
5131 ip += 5;
5132 need_merge = 1;
5133 break;
5134
5135 case CEE_LDLOC_S:
5136 case CEE_LDLOCA_S:
5137 code_bounds_check (2);
5138 push_local (&ctx, ip[1], *ip == CEE_LDLOCA_S);
5139 ip += 2;
5140 break;
5141
5142 case CEE_UNUSED99:
5143 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5144 ++ip;
5145 break;
5146
5147 case CEE_DUP: {
5148 ILStackDesc *top;
5149 if (!check_underflow (&ctx, 1))
5150 break;
5151 if (!check_overflow (&ctx))
5152 break;
5153 top = stack_push (&ctx);
5154 copy_stack_value (top, stack_peek (&ctx, 1));
5155 ++ip;
5156 break;
5157 }
5158
5159 case CEE_JMP:
5160 code_bounds_check (5);
5161 if (ctx.eval.size)
5162 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Eval stack must be empty in jmp at 0x%04x", ip_offset));
5163 token = read32 (ip + 1);
5164 if (in_any_block (ctx.header, ip_offset))
5165 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("jmp cannot escape exception blocks at 0x%04x", ip_offset));
5166
5167 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction jmp is not verifiable at 0x%04x", ctx.ip_offset));
5168 /*
5169 * FIXME: check signature, retval, arguments etc.
5170 */
5171 ip += 5;
5172 break;
5173 case CEE_CALL:
5174 case CEE_CALLVIRT:
5175 code_bounds_check (5);
5176 do_invoke_method (&ctx, read32 (ip + 1), *ip == CEE_CALLVIRT);
5177 ip += 5;
5178 break;
5179
5180 case CEE_CALLI:
5181 code_bounds_check (5);
5182 token = read32 (ip + 1);
5183 /*
5184 * FIXME: check signature, retval, arguments etc.
5185 * FIXME: check requirements for tail call
5186 */
5187 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction calli is not verifiable at 0x%04x", ctx.ip_offset));
5188 ip += 5;
5189 break;
5190 case CEE_BR_S:
5191 code_bounds_check (2);
5192 do_static_branch (&ctx, (signed char)ip [1] + 2);
5193 need_merge = 1;
5194 ip += 2;
5195 start = 1;
5196 break;
5197
5198 case CEE_BRFALSE_S:
5199 case CEE_BRTRUE_S:
5200 code_bounds_check (2);
5201 do_boolean_branch_op (&ctx, (signed char)ip [1] + 2);
5202 ip += 2;
5203 need_merge = 1;
5204 break;
5205
5206 case CEE_BR:
5207 code_bounds_check (5);
5208 do_static_branch (&ctx, (gint32)read32 (ip + 1) + 5);
5209 need_merge = 1;
5210 ip += 5;
5211 start = 1;
5212 break;
5213
5214 case CEE_BRFALSE:
5215 case CEE_BRTRUE:
5216 code_bounds_check (5);
5217 do_boolean_branch_op (&ctx, (gint32)read32 (ip + 1) + 5);
5218 ip += 5;
5219 need_merge = 1;
5220 break;
5221
5222 case CEE_SWITCH: {
5223 guint32 entries;
5224 code_bounds_check (5);
5225 entries = read32 (ip + 1);
5226
5227 if (entries > 0xFFFFFFFFU / sizeof (guint32))
5228 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Too many switch entries %x at 0x%04x", entries, ctx.ip_offset));
5229
5230 ip += 5;
5231 code_bounds_check (sizeof (guint32) * entries);
5232
5233 do_switch (&ctx, entries, ip);
5234 ip += sizeof (guint32) * entries;
5235 break;
5236 }
5237 case CEE_LDIND_I1:
5238 case CEE_LDIND_U1:
5239 case CEE_LDIND_I2:
5240 case CEE_LDIND_U2:
5241 case CEE_LDIND_I4:
5242 case CEE_LDIND_U4:
5243 case CEE_LDIND_I8:
5244 case CEE_LDIND_I:
5245 case CEE_LDIND_R4:
5246 case CEE_LDIND_R8:
5247 case CEE_LDIND_REF:
5248 do_load_indirect (&ctx, *ip);
5249 ++ip;
5250 break;
5251
5252 case CEE_STIND_REF:
5253 case CEE_STIND_I1:
5254 case CEE_STIND_I2:
5255 case CEE_STIND_I4:
5256 case CEE_STIND_I8:
5257 case CEE_STIND_R4:
5258 case CEE_STIND_R8:
5259 case CEE_STIND_I:
5260 do_store_indirect (&ctx, *ip);
5261 ++ip;
5262 break;
5263
5264 case CEE_NOT:
5265 case CEE_NEG:
5266 do_unary_math_op (&ctx, *ip);
5267 ++ip;
5268 break;
5269
5270 case CEE_CONV_I1:
5271 case CEE_CONV_I2:
5272 case CEE_CONV_I4:
5273 case CEE_CONV_U1:
5274 case CEE_CONV_U2:
5275 case CEE_CONV_U4:
5276 do_conversion (&ctx, TYPE_I4);
5277 ++ip;
5278 break;
5279
5280 case CEE_CONV_I8:
5281 case CEE_CONV_U8:
5282 do_conversion (&ctx, TYPE_I8);
5283 ++ip;
5284 break;
5285
5286 case CEE_CONV_R4:
5287 case CEE_CONV_R8:
5288 case CEE_CONV_R_UN:
5289 do_conversion (&ctx, TYPE_R8);
5290 ++ip;
5291 break;
5292
5293 case CEE_CONV_I:
5294 case CEE_CONV_U:
5295 do_conversion (&ctx, TYPE_NATIVE_INT);
5296 ++ip;
5297 break;
5298
5299 case CEE_CPOBJ:
5300 code_bounds_check (5);
5301 do_cpobj (&ctx, read32 (ip + 1));
5302 ip += 5;
5303 break;
5304
5305 case CEE_LDOBJ:
5306 code_bounds_check (5);
5307 do_ldobj_value (&ctx, read32 (ip + 1));
5308 ip += 5;
5309 break;
5310
5311 case CEE_LDSTR:
5312 code_bounds_check (5);
5313 do_ldstr (&ctx, read32 (ip + 1));
5314 ip += 5;
5315 break;
5316
5317 case CEE_NEWOBJ:
5318 code_bounds_check (5);
5319 do_newobj (&ctx, read32 (ip + 1));
5320 ip += 5;
5321 break;
5322
5323 case CEE_CASTCLASS:
5324 case CEE_ISINST:
5325 code_bounds_check (5);
5326 do_cast (&ctx, read32 (ip + 1), *ip == CEE_CASTCLASS ? "castclass" : "isinst");
5327 ip += 5;
5328 break;
5329
5330 case CEE_UNUSED58:
5331 case CEE_UNUSED1:
5332 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5333 ++ip;
5334 break;
5335
5336 case CEE_UNBOX:
5337 code_bounds_check (5);
5338 do_unbox_value (&ctx, read32 (ip + 1));
5339 ip += 5;
5340 break;
5341
5342 case CEE_THROW:
5343 do_throw (&ctx);
5344 start = 1;
5345 ++ip;
5346 break;
5347
5348 case CEE_LDFLD:
5349 case CEE_LDFLDA:
5350 code_bounds_check (5);
5351 do_push_field (&ctx, read32 (ip + 1), *ip == CEE_LDFLDA);
5352 ip += 5;
5353 break;
5354
5355 case CEE_LDSFLD:
5356 case CEE_LDSFLDA:
5357 code_bounds_check (5);
5358 do_push_static_field (&ctx, read32 (ip + 1), *ip == CEE_LDSFLDA);
5359 ip += 5;
5360 break;
5361
5362 case CEE_STFLD:
5363 code_bounds_check (5);
5364 do_store_field (&ctx, read32 (ip + 1));
5365 ip += 5;
5366 break;
5367
5368 case CEE_STSFLD:
5369 code_bounds_check (5);
5370 do_store_static_field (&ctx, read32 (ip + 1));
5371 ip += 5;
5372 break;
5373
5374 case CEE_STOBJ:
5375 code_bounds_check (5);
5376 do_stobj (&ctx, read32 (ip + 1));
5377 ip += 5;
5378 break;
5379
5380 case CEE_CONV_OVF_I1_UN:
5381 case CEE_CONV_OVF_I2_UN:
5382 case CEE_CONV_OVF_I4_UN:
5383 case CEE_CONV_OVF_U1_UN:
5384 case CEE_CONV_OVF_U2_UN:
5385 case CEE_CONV_OVF_U4_UN:
5386 do_conversion (&ctx, TYPE_I4);
5387 ++ip;
5388 break;
5389
5390 case CEE_CONV_OVF_I8_UN:
5391 case CEE_CONV_OVF_U8_UN:
5392 do_conversion (&ctx, TYPE_I8);
5393 ++ip;
5394 break;
5395
5396 case CEE_CONV_OVF_I_UN:
5397 case CEE_CONV_OVF_U_UN:
5398 do_conversion (&ctx, TYPE_NATIVE_INT);
5399 ++ip;
5400 break;
5401
5402 case CEE_BOX:
5403 code_bounds_check (5);
5404 do_box_value (&ctx, read32 (ip + 1));
5405 ip += 5;
5406 break;
5407
5408 case CEE_NEWARR:
5409 code_bounds_check (5);
5410 do_newarr (&ctx, read32 (ip + 1));
5411 ip += 5;
5412 break;
5413
5414 case CEE_LDLEN:
5415 do_ldlen (&ctx);
5416 ++ip;
5417 break;
5418
5419 case CEE_LDELEMA:
5420 code_bounds_check (5);
5421 do_ldelema (&ctx, read32 (ip + 1));
5422 ip += 5;
5423 break;
5424
5425 case CEE_LDELEM_I1:
5426 case CEE_LDELEM_U1:
5427 case CEE_LDELEM_I2:
5428 case CEE_LDELEM_U2:
5429 case CEE_LDELEM_I4:
5430 case CEE_LDELEM_U4:
5431 case CEE_LDELEM_I8:
5432 case CEE_LDELEM_I:
5433 case CEE_LDELEM_R4:
5434 case CEE_LDELEM_R8:
5435 case CEE_LDELEM_REF:
5436 do_ldelem (&ctx, *ip, 0);
5437 ++ip;
5438 break;
5439
5440 case CEE_STELEM_I:
5441 case CEE_STELEM_I1:
5442 case CEE_STELEM_I2:
5443 case CEE_STELEM_I4:
5444 case CEE_STELEM_I8:
5445 case CEE_STELEM_R4:
5446 case CEE_STELEM_R8:
5447 case CEE_STELEM_REF:
5448 do_stelem (&ctx, *ip, 0);
5449 ++ip;
5450 break;
5451
5452 case CEE_LDELEM:
5453 code_bounds_check (5);
5454 do_ldelem (&ctx, *ip, read32 (ip + 1));
5455 ip += 5;
5456 break;
5457
5458 case CEE_STELEM:
5459 code_bounds_check (5);
5460 do_stelem (&ctx, *ip, read32 (ip + 1));
5461 ip += 5;
5462 break;
5463
5464 case CEE_UNBOX_ANY:
5465 code_bounds_check (5);
5466 do_unbox_any (&ctx, read32 (ip + 1));
5467 ip += 5;
5468 break;
5469
5470 case CEE_CONV_OVF_I1:
5471 case CEE_CONV_OVF_U1:
5472 case CEE_CONV_OVF_I2:
5473 case CEE_CONV_OVF_U2:
5474 case CEE_CONV_OVF_I4:
5475 case CEE_CONV_OVF_U4:
5476 do_conversion (&ctx, TYPE_I4);
5477 ++ip;
5478 break;
5479
5480 case CEE_CONV_OVF_I8:
5481 case CEE_CONV_OVF_U8:
5482 do_conversion (&ctx, TYPE_I8);
5483 ++ip;
5484 break;
5485
5486 case CEE_CONV_OVF_I:
5487 case CEE_CONV_OVF_U:
5488 do_conversion (&ctx, TYPE_NATIVE_INT);
5489 ++ip;
5490 break;
5491
5492 case CEE_REFANYVAL:
5493 code_bounds_check (5);
5494 do_refanyval (&ctx, read32 (ip + 1));
5495 ip += 5;
5496 break;
5497
5498 case CEE_CKFINITE:
5499 do_ckfinite (&ctx);
5500 ++ip;
5501 break;
5502
5503 case CEE_MKREFANY:
5504 code_bounds_check (5);
5505 do_mkrefany (&ctx, read32 (ip + 1));
5506 ip += 5;
5507 break;
5508
5509 case CEE_LDTOKEN:
5510 code_bounds_check (5);
5511 do_load_token (&ctx, read32 (ip + 1));
5512 ip += 5;
5513 break;
5514
5515 case CEE_ENDFINALLY:
5516 if (!is_correct_endfinally (ctx.header, ip_offset))
5517 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("endfinally must be used inside a finally/fault handler at 0x%04x", ctx.ip_offset));
5518 ctx.eval.size = 0;
5519 start = 1;
5520 ++ip;
5521 break;
5522
5523 case CEE_LEAVE:
5524 code_bounds_check (5);
5525 do_leave (&ctx, read32 (ip + 1) + 5);
5526 ip += 5;
5527 start = 1;
5528 need_merge = 1;
5529 break;
5530
5531 case CEE_LEAVE_S:
5532 code_bounds_check (2);
5533 do_leave (&ctx, (signed char)ip [1] + 2);
5534 ip += 2;
5535 start = 1;
5536 need_merge = 1;
5537 break;
5538
5539 case CEE_PREFIX1:
5540 code_bounds_check (2);
5541 ++ip;
5542 switch (*ip) {
5543 case CEE_STLOC:
5544 code_bounds_check (3);
5545 store_local (&ctx, read16 (ip + 1));
5546 ip += 3;
5547 break;
5548
5549 case CEE_CEQ:
5550 do_cmp_op (&ctx, cmp_br_eq_op, *ip);
5551 ++ip;
5552 break;
5553
5554 case CEE_CGT:
5555 case CEE_CGT_UN:
5556 case CEE_CLT:
5557 case CEE_CLT_UN:
5558 do_cmp_op (&ctx, cmp_br_op, *ip);
5559 ++ip;
5560 break;
5561
5562 case CEE_STARG:
5563 code_bounds_check (3);
5564 store_arg (&ctx, read16 (ip + 1) );
5565 ip += 3;
5566 break;
5567
5568
5569 case CEE_ARGLIST:
5570 if (!check_overflow (&ctx))
5571 break;
5572 if (ctx.signature->call_convention != MONO_CALL_VARARG)
5573 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Cannot use arglist on method without VARGARG calling convention at 0x%04x", ctx.ip_offset));
5574 set_stack_value (&ctx, stack_push (&ctx), &mono_defaults.argumenthandle_class->byval_arg, FALSE);
5575 ++ip;
5576 break;
5577
5578 case CEE_LDFTN:
5579 code_bounds_check (5);
5580 do_load_function_ptr (&ctx, read32 (ip + 1), FALSE);
5581 ip += 5;
5582 break;
5583
5584 case CEE_LDVIRTFTN:
5585 code_bounds_check (5);
5586 do_load_function_ptr (&ctx, read32 (ip + 1), TRUE);
5587 ip += 5;
5588 break;
5589
5590 case CEE_LDARG:
5591 case CEE_LDARGA:
5592 code_bounds_check (3);
5593 push_arg (&ctx, read16 (ip + 1), *ip == CEE_LDARGA);
5594 ip += 3;
5595 break;
5596
5597 case CEE_LDLOC:
5598 case CEE_LDLOCA:
5599 code_bounds_check (3);
5600 push_local (&ctx, read16 (ip + 1), *ip == CEE_LDLOCA);
5601 ip += 3;
5602 break;
5603
5604 case CEE_LOCALLOC:
5605 do_localloc (&ctx);
5606 ++ip;
5607 break;
5608
5609 case CEE_UNUSED56:
5610 case CEE_UNUSED57:
5611 case CEE_UNUSED70:
5612 case CEE_UNUSED:
5613 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5614 ++ip;
5615 break;
5616 case CEE_ENDFILTER:
5617 do_endfilter (&ctx);
5618 start = 1;
5619 ++ip;
5620 break;
5621 case CEE_UNALIGNED_:
5622 code_bounds_check (2);
5623 prefix |= PREFIX_UNALIGNED;
5624 ip += 2;
5625 break;
5626 case CEE_VOLATILE_:
5627 prefix |= PREFIX_VOLATILE;
5628 ++ip;
5629 break;
5630 case CEE_TAIL_:
5631 prefix |= PREFIX_TAIL;
5632 ++ip;
5633 if (ip < end && (*ip != CEE_CALL && *ip != CEE_CALLI && *ip != CEE_CALLVIRT))
5634 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("tail prefix must be used only with call opcodes at 0x%04x", ip_offset));
5635 break;
5636
5637 case CEE_INITOBJ:
5638 code_bounds_check (5);
5639 do_initobj (&ctx, read32 (ip + 1));
5640 ip += 5;
5641 break;
5642
5643 case CEE_CONSTRAINED_:
5644 code_bounds_check (5);
5645 ctx.constrained_type = get_boxable_mono_type (&ctx, read32 (ip + 1), "constrained.");
5646 prefix |= PREFIX_CONSTRAINED;
5647 ip += 5;
5648 break;
5649
5650 case CEE_READONLY_:
5651 prefix |= PREFIX_READONLY;
5652 ip++;
5653 break;
5654
5655 case CEE_CPBLK:
5656 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5657 if (!check_underflow (&ctx, 3))
5658 break;
5659 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction cpblk is not verifiable at 0x%04x", ctx.ip_offset));
5660 ip++;
5661 break;
5662
5663 case CEE_INITBLK:
5664 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5665 if (!check_underflow (&ctx, 3))
5666 break;
5667 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction initblk is not verifiable at 0x%04x", ctx.ip_offset));
5668 ip++;
5669 break;
5670
5671 case CEE_NO_:
5672 ip += 2;
5673 break;
5674 case CEE_RETHROW:
5675 if (!is_correct_rethrow (ctx.header, ip_offset))
5676 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("rethrow must be used inside a catch handler at 0x%04x", ctx.ip_offset));
5677 ctx.eval.size = 0;
5678 start = 1;
5679 ++ip;
5680 break;
5681
5682 case CEE_SIZEOF:
5683 code_bounds_check (5);
5684 do_sizeof (&ctx, read32 (ip + 1));
5685 ip += 5;
5686 break;
5687
5688 case CEE_REFANYTYPE:
5689 do_refanytype (&ctx);
5690 ++ip;
5691 break;
5692
5693 default:
5694 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction FE %x at 0x%04x", *ip, ctx.ip_offset));
5695 ++ip;
5696 }
5697 break;
5698
5699 default:
5700 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ctx.ip_offset));
5701 ++ip;
5702 }
5703
5704 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
5705 if (prefix) {
5706 if (!ctx.prefix_set) //first prefix
5707 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
5708 ctx.prefix_set |= prefix;
5709 ctx.has_flags = TRUE;
5710 prefix = 0;
5711 } else {
5712 if (!ctx.has_flags)
5713 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
5714
5715 if (ctx.prefix_set & PREFIX_CONSTRAINED)
5716 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after constrained prefix at 0x%04x", ctx.ip_offset));
5717 if (ctx.prefix_set & PREFIX_READONLY)
5718 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after readonly prefix at 0x%04x", ctx.ip_offset));
5719 if (ctx.prefix_set & PREFIX_VOLATILE)
5720 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after volatile prefix at 0x%04x", ctx.ip_offset));
5721 if (ctx.prefix_set & PREFIX_UNALIGNED)
5722 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after unaligned prefix at 0x%04x", ctx.ip_offset));
5723 ctx.prefix_set = prefix = 0;
5724 ctx.has_flags = FALSE;
5725 }
5726 }
5727 /*
5728 * if ip != end we overflowed: mark as error.
5729 */
5730 if ((ip != end || !start) && ctx.verifiable && !ctx.list) {
5731 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Run ahead of method code at 0x%04x", ip_offset));
5732 }
5733
5734 /*We should guard against the last decoded opcode, otherwise we might add errors that doesn't make sense.*/
5735 for (i = 0; i < ctx.code_size && i < ip_offset; ++i) {
5736 if (ctx.code [i].flags & IL_CODE_FLAG_WAS_TARGET) {
5737 if (!(ctx.code [i].flags & IL_CODE_FLAG_SEEN))
5738 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or exception block target middle of intruction at 0x%04x", i));
5739
5740 if (ctx.code [i].flags & IL_CODE_DELEGATE_SEQUENCE)
5741 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Branch to delegate code sequence at 0x%04x", i));
5742 }
5743 if ((ctx.code [i].flags & IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL) && ctx.has_this_store)
5744 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", i));
5745
5746 if ((ctx.code [i].flags & IL_CODE_CALL_NONFINAL_VIRTUAL) && ctx.has_this_store)
5747 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));
5748 }
5749
5750 if (mono_method_is_constructor (ctx.method) && !ctx.super_ctor_called && !ctx.method->klass->valuetype && ctx.method->klass != mono_defaults.object_class) {
5751 char *method_name = mono_method_full_name (ctx.method, TRUE);
5752 char *type = mono_type_get_full_name (ctx.method->klass);
5753 if (ctx.method->klass->parent && ctx.method->klass->parent->exception_type != MONO_EXCEPTION_NONE)
5754 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));
5755 else
5756 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor.", method_name, type));
5757 g_free (method_name);
5758 g_free (type);
5759 }
5760
5761 cleanup:
5762 if (ctx.code) {
5763 for (i = 0; i < ctx.header->code_size; ++i) {
5764 if (ctx.code [i].stack)
5765 g_free (ctx.code [i].stack);
5766 }
5767 }
5768
5769 for (tmp = ctx.funptrs; tmp; tmp = tmp->next)
5770 g_free (tmp->data);
5771 g_slist_free (ctx.funptrs);
5772
5773 for (tmp = ctx.exception_types; tmp; tmp = tmp->next)
5774 mono_metadata_free_type (tmp->data);
5775 g_slist_free (ctx.exception_types);
5776
5777 for (i = 0; i < ctx.num_locals; ++i) {
5778 if (ctx.locals [i])
5779 mono_metadata_free_type (ctx.locals [i]);
5780 }
5781 for (i = 0; i < ctx.max_args; ++i) {
5782 if (ctx.params [i])
5783 mono_metadata_free_type (ctx.params [i]);
5784 }
5785
5786 if (ctx.eval.stack)
5787 g_free (ctx.eval.stack);
5788 if (ctx.code)
5789 g_free (ctx.code);
5790 g_free (ctx.locals);
5791 g_free (ctx.params);
5792 mono_basic_block_free (original_bb);
5793 mono_metadata_free_mh (ctx.header);
5794
5795 finish_collect_stats ();
5796 return ctx.list;
5797 }
5798
5799 char*
5800 mono_verify_corlib ()
5801 {
5802 /* This is a public API function so cannot be removed */
5803 return NULL;
5804 }
5805
5806 /*
5807 * Returns true if @method needs to be verified.
5808 *
5809 */
5810 gboolean
5811 mono_verifier_is_enabled_for_method (MonoMethod *method)
5812 {
5813 return mono_verifier_is_enabled_for_class (method->klass) && (method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD);
5814 }
5815
5816 /*
5817 * Returns true if @klass need to be verified.
5818 *
5819 */
5820 gboolean
5821 mono_verifier_is_enabled_for_class (MonoClass *klass)
5822 {
5823 return verify_all || (verifier_mode > MONO_VERIFIER_MODE_OFF && !(klass->image->assembly && klass->image->assembly->in_gac) && klass->image != mono_defaults.corlib);
5824 }
5825
5826 gboolean
5827 mono_verifier_is_enabled_for_image (MonoImage *image)
5828 {
5829 return verify_all || verifier_mode > MONO_VERIFIER_MODE_OFF;
5830 }
5831
5832 /*
5833 * Dynamic methods are not considered full trust since if the user is trusted and need to
5834 * generate unsafe code, make the method skip verification - this is a known good way to do it.
5835 */
5836 gboolean
5837 mono_verifier_is_method_full_trust (MonoMethod *method)
5838 {
5839 return mono_verifier_is_class_full_trust (method->klass) && !method->dynamic;
5840 }
5841
5842 /*
5843 * Returns if @klass is under full trust or not.
5844 *
5845 * TODO This code doesn't take CAS into account.
5846 *
5847 * Under verify_all all user code must be verifiable if no security option was set
5848 *
5849 */
5850 gboolean
5851 mono_verifier_is_class_full_trust (MonoClass *klass)
5852 {
5853 /* under CoreCLR code is trusted if it is part of the "platform" otherwise all code inside the GAC is trusted */
5854 gboolean trusted_location = (mono_security_get_mode () != MONO_SECURITY_MODE_CORE_CLR) ?
5855 (klass->image->assembly && klass->image->assembly->in_gac) : mono_security_core_clr_is_platform_image (klass->image);
5856
5857 if (verify_all && verifier_mode == MONO_VERIFIER_MODE_OFF)
5858 return trusted_location || klass->image == mono_defaults.corlib;
5859 return verifier_mode < MONO_VERIFIER_MODE_VERIFIABLE || trusted_location || klass->image == mono_defaults.corlib;
5860 }
5861
5862 GSList*
5863 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility)
5864 {
5865 return mono_method_verify (method,
5866 (verifier_mode != MONO_VERIFIER_MODE_STRICT ? MONO_VERIFY_NON_STRICT: 0)
5867 | (!mono_verifier_is_method_full_trust (method) ? MONO_VERIFY_FAIL_FAST : 0)
5868 | (skip_visibility ? MONO_VERIFY_SKIP_VISIBILITY : 0));
5869 }
5870
5871 static int
5872 get_field_end (MonoClassField *field)
5873 {
5874 int align;
5875 int size = mono_type_size (field->type, &align);
5876 if (size == 0)
5877 size = 4; /*FIXME Is this a safe bet?*/
5878 return size + field->offset;
5879 }
5880
5881 static gboolean
5882 verify_class_for_overlapping_reference_fields (MonoClass *class)
5883 {
5884 int i = 0, j;
5885 gpointer iter = NULL;
5886 MonoClassField *field;
5887 gboolean is_fulltrust = mono_verifier_is_class_full_trust (class);
5888 /*We can't skip types with !has_references since this is calculated after we have run.*/
5889 if (!((class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT))
5890 return TRUE;
5891
5892
5893 /*We must check for stuff overlapping reference fields.
5894 The outer loop uses mono_class_get_fields to ensure that MonoClass:fields get inited.
5895 */
5896 while ((field = mono_class_get_fields (class, &iter))) {
5897 int fieldEnd = get_field_end (field);
5898 gboolean is_valuetype = !MONO_TYPE_IS_REFERENCE (field->type);
5899 ++i;
5900
5901 if (mono_field_is_deleted (field) || (field->type->attrs & FIELD_ATTRIBUTE_STATIC))
5902 continue;
5903
5904 for (j = i; j < class->field.count; ++j) {
5905 MonoClassField *other = &class->fields [j];
5906 int otherEnd = get_field_end (other);
5907 if (mono_field_is_deleted (other) || (is_valuetype && !MONO_TYPE_IS_REFERENCE (other->type)) || (other->type->attrs & FIELD_ATTRIBUTE_STATIC))
5908 continue;
5909
5910 if (!is_valuetype && MONO_TYPE_IS_REFERENCE (other->type) && field->offset == other->offset && is_fulltrust)
5911 continue;
5912
5913 if ((otherEnd > field->offset && otherEnd <= fieldEnd) || (other->offset >= field->offset && other->offset < fieldEnd))
5914 return FALSE;
5915 }
5916 }
5917 return TRUE;
5918 }
5919
5920 static guint
5921 field_hash (gconstpointer key)
5922 {
5923 const MonoClassField *field = key;
5924 return g_str_hash (field->name) ^ mono_metadata_type_hash (field->type); /**/
5925 }
5926
5927 static gboolean
5928 field_equals (gconstpointer _a, gconstpointer _b)
5929 {
5930 const MonoClassField *a = _a;
5931 const MonoClassField *b = _b;
5932 return !strcmp (a->name, b->name) && mono_metadata_type_equal (a->type, b->type);
5933 }
5934
5935
5936 static gboolean
5937 verify_class_fields (MonoClass *class)
5938 {
5939 gpointer iter = NULL;
5940 MonoClassField *field;
5941 MonoGenericContext *context = mono_class_get_context (class);
5942 GHashTable *unique_fields = g_hash_table_new_full (&field_hash, &field_equals, NULL, NULL);
5943 if (class->generic_container)
5944 context = &class->generic_container->context;
5945
5946 while ((field = mono_class_get_fields (class, &iter)) != NULL) {
5947 if (!mono_type_is_valid_type_in_context (field->type, context)) {
5948 g_hash_table_destroy (unique_fields);
5949 return FALSE;
5950 }
5951 if (g_hash_table_lookup (unique_fields, field)) {
5952 g_hash_table_destroy (unique_fields);
5953 return FALSE;
5954 }
5955 g_hash_table_insert (unique_fields, field, field);
5956 }
5957 g_hash_table_destroy (unique_fields);
5958 return TRUE;
5959 }
5960
5961 static gboolean
5962 verify_interfaces (MonoClass *class)
5963 {
5964 int i;
5965 for (i = 0; i < class->interface_count; ++i) {
5966 MonoClass *iface = class->interfaces [i];
5967 if (!(iface->flags & TYPE_ATTRIBUTE_INTERFACE))
5968 return FALSE;
5969 }
5970 return TRUE;
5971 }
5972
5973 static gboolean
5974 verify_valuetype_layout_with_target (MonoClass *class, MonoClass *target_class)
5975 {
5976 int type;
5977 gpointer iter = NULL;
5978 MonoClassField *field;
5979 MonoClass *field_class;
5980
5981 if (!class->valuetype)
5982 return TRUE;
5983
5984 type = class->byval_arg.type;
5985 /*primitive type fields are not properly decoded*/
5986 if ((type >= MONO_TYPE_BOOLEAN && type <= MONO_TYPE_R8) || (type >= MONO_TYPE_I && type <= MONO_TYPE_U))
5987 return TRUE;
5988
5989 while ((field = mono_class_get_fields (class, &iter)) != NULL) {
5990 if (!field->type)
5991 return FALSE;
5992
5993 if (field->type->attrs & (FIELD_ATTRIBUTE_STATIC | FIELD_ATTRIBUTE_HAS_FIELD_RVA))
5994 continue;
5995
5996 field_class = mono_class_get_generic_type_definition (mono_class_from_mono_type (field->type));
5997
5998 if (field_class == target_class || class == field_class || !verify_valuetype_layout_with_target (field_class, target_class))
5999 return FALSE;
6000 }
6001
6002 return TRUE;
6003 }
6004
6005 static gboolean
6006 verify_valuetype_layout (MonoClass *class)
6007 {
6008 gboolean res;
6009 res = verify_valuetype_layout_with_target (class, class);
6010 return res;
6011 }
6012
6013 static gboolean
6014 recursive_mark_constraint_args (MonoBitSet *used_args, MonoGenericContainer *gc, MonoType *type)
6015 {
6016 int idx;
6017 MonoClass **constraints;
6018 MonoGenericParamInfo *param_info;
6019
6020 g_assert (mono_type_is_generic_argument (type));
6021
6022 idx = mono_type_get_generic_param_num (type);
6023 if (mono_bitset_test_fast (used_args, idx))
6024 return FALSE;
6025
6026 mono_bitset_set_fast (used_args, idx);
6027 param_info = mono_generic_container_get_param_info (gc, idx);
6028
6029 if (!param_info->constraints)
6030 return TRUE;
6031
6032 for (constraints = param_info->constraints; *constraints; ++constraints) {
6033 MonoClass *ctr = *constraints;
6034 MonoType *constraint_type = &ctr->byval_arg;
6035
6036 if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
6037 return FALSE;
6038 }
6039 return TRUE;
6040 }
6041
6042 static gboolean
6043 verify_generic_parameters (MonoClass *class)
6044 {
6045 int i;
6046 MonoGenericContainer *gc = class->generic_container;
6047 MonoBitSet *used_args = mono_bitset_new (gc->type_argc, 0);
6048
6049 for (i = 0; i < gc->type_argc; ++i) {
6050 MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
6051 MonoClass **constraints;
6052
6053 if (!param_info->constraints)
6054 continue;
6055
6056 mono_bitset_clear_all (used_args);
6057 mono_bitset_set_fast (used_args, i);
6058
6059 for (constraints = param_info->constraints; *constraints; ++constraints) {
6060 MonoClass *ctr = *constraints;
6061 MonoType *constraint_type = &ctr->byval_arg;
6062
6063 if (!mono_type_is_valid_type_in_context (constraint_type, &gc->context))
6064 goto fail;
6065
6066 if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
6067 goto fail;
6068 if (ctr->generic_class && !mono_class_is_valid_generic_instantiation (NULL, ctr))
6069 goto fail;
6070 }
6071 }
6072 mono_bitset_free (used_args);
6073 return TRUE;
6074
6075 fail:
6076 mono_bitset_free (used_args);
6077 return FALSE;
6078 }
6079
6080 /*
6081 * Check if the class is verifiable.
6082 *
6083 * Right now there are no conditions that make a class a valid but not verifiable. Both overlapping reference
6084 * field and invalid generic instantiation are fatal errors.
6085 *
6086 * This method must be safe to be called from mono_class_init and all code must be carefull about that.
6087 *
6088 */
6089 gboolean
6090 mono_verifier_verify_class (MonoClass *class)
6091 {
6092 /*Neither <Module>, object or ifaces have parent.*/
6093 if (!class->parent &&
6094 class != mono_defaults.object_class &&
6095 !MONO_CLASS_IS_INTERFACE (class) &&
6096 (!class->image->dynamic && class->type_token != 0x2000001)) /*<Module> is the first type in the assembly*/
6097 return FALSE;
6098 if (class->parent) {
6099 if (MONO_CLASS_IS_INTERFACE (class->parent))
6100 return FALSE;
6101 if (!class->generic_class && class->parent->generic_container)
6102 return FALSE;
6103 }
6104 if (class->generic_container && (class->flags & TYPE_ATTRIBUTE_LAYOUT_MASK) == TYPE_ATTRIBUTE_EXPLICIT_LAYOUT)
6105 return FALSE;
6106 if (class->generic_container && !verify_generic_parameters (class))
6107 return FALSE;
6108 if (!verify_class_for_overlapping_reference_fields (class))
6109 return FALSE;
6110 if (class->generic_class && !mono_class_is_valid_generic_instantiation (NULL, class))
6111 return FALSE;
6112 if (class->generic_class == NULL && !verify_class_fields (class))
6113 return FALSE;
6114 if (class->valuetype && !verify_valuetype_layout (class))
6115 return FALSE;
6116 if (!verify_interfaces (class))
6117 return FALSE;
6118 return TRUE;
6119 }
6120
6121 gboolean
6122 mono_verifier_class_is_valid_generic_instantiation (MonoClass *class)
6123 {
6124 return mono_class_is_valid_generic_instantiation (NULL, class);
6125 }
6126
6127 gboolean
6128 mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
6129 {
6130 if (!method->is_inflated)
6131 return TRUE;
6132 return mono_method_is_valid_generic_instantiation (NULL, method);
6133 }
6134
6135 #else
6136
6137 gboolean
6138 mono_verifier_verify_class (MonoClass *class)
6139 {
6140 /* The verifier was disabled at compile time */
6141 return TRUE;
6142 }
6143
6144 GSList*
6145 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility)
6146 {
6147 /* The verifier was disabled at compile time */
6148 return NULL;
6149 }
6150
6151 gboolean
6152 mono_verifier_is_class_full_trust (MonoClass *klass)
6153 {
6154 /* The verifier was disabled at compile time */
6155 return TRUE;
6156 }
6157
6158 gboolean
6159 mono_verifier_is_method_full_trust (MonoMethod *method)
6160 {
6161 /* The verifier was disabled at compile time */
6162 return TRUE;
6163 }
6164
6165 gboolean
6166 mono_verifier_is_enabled_for_image (MonoImage *image)
6167 {
6168 /* The verifier was disabled at compile time */
6169 return FALSE;
6170 }
6171
6172 gboolean
6173 mono_verifier_is_enabled_for_class (MonoClass *klass)
6174 {
6175 /* The verifier was disabled at compile time */
6176 return FALSE;
6177 }
6178
6179 gboolean
6180 mono_verifier_is_enabled_for_method (MonoMethod *method)
6181 {
6182 /* The verifier was disabled at compile time */
6183 return FALSE;
6184 }
6185
6186 GSList*
6187 mono_method_verify (MonoMethod *method, int level)
6188 {
6189 /* The verifier was disabled at compile time */
6190 return NULL;
6191 }
6192
6193 void
6194 mono_free_verify_list (GSList *list)
6195 {
6196 /* The verifier was disabled at compile time */
6197 /* will always be null if verifier is disabled */
6198 }
6199
6200 gboolean
6201 mono_verifier_class_is_valid_generic_instantiation (MonoClass *class)
6202 {
6203 return TRUE;
6204 }
6205
6206 gboolean
6207 mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
6208 {
6209 return TRUE;
6210 }
6211
6212
6213
6214 #endif
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