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1 //===-- msan.cc -----------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of MemorySanitizer.
11 //
12 // MemorySanitizer runtime.
13 //===----------------------------------------------------------------------===//
14
15 #include "msan.h"
16 #include "msan_chained_origin_depot.h"
17 #include "msan_origin.h"
18 #include "msan_thread.h"
19 #include "msan_poisoning.h"
20 #include "sanitizer_common/sanitizer_atomic.h"
21 #include "sanitizer_common/sanitizer_common.h"
22 #include "sanitizer_common/sanitizer_flags.h"
23 #include "sanitizer_common/sanitizer_flag_parser.h"
24 #include "sanitizer_common/sanitizer_libc.h"
25 #include "sanitizer_common/sanitizer_procmaps.h"
26 #include "sanitizer_common/sanitizer_stacktrace.h"
27 #include "sanitizer_common/sanitizer_symbolizer.h"
28 #include "sanitizer_common/sanitizer_stackdepot.h"
29 #include "ubsan/ubsan_flags.h"
30 #include "ubsan/ubsan_init.h"
31
32 // ACHTUNG! No system header includes in this file.
33
34 using namespace __sanitizer;
35
36 // Globals.
37 static THREADLOCAL int msan_expect_umr = 0;
38 static THREADLOCAL int msan_expected_umr_found = 0;
39
40 // Function argument shadow. Each argument starts at the next available 8-byte
41 // aligned address.
42 SANITIZER_INTERFACE_ATTRIBUTE
43 THREADLOCAL u64 __msan_param_tls[kMsanParamTlsSize / sizeof(u64)];
44
45 // Function argument origin. Each argument starts at the same offset as the
46 // corresponding shadow in (__msan_param_tls). Slightly weird, but changing this
47 // would break compatibility with older prebuilt binaries.
48 SANITIZER_INTERFACE_ATTRIBUTE
49 THREADLOCAL u32 __msan_param_origin_tls[kMsanParamTlsSize / sizeof(u32)];
50
51 SANITIZER_INTERFACE_ATTRIBUTE
52 THREADLOCAL u64 __msan_retval_tls[kMsanRetvalTlsSize / sizeof(u64)];
53
54 SANITIZER_INTERFACE_ATTRIBUTE
55 THREADLOCAL u32 __msan_retval_origin_tls;
56
57 SANITIZER_INTERFACE_ATTRIBUTE
58 ALIGNED(16) THREADLOCAL u64 __msan_va_arg_tls[kMsanParamTlsSize / sizeof(u64)];
59
60 SANITIZER_INTERFACE_ATTRIBUTE
61 THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
62
63 SANITIZER_INTERFACE_ATTRIBUTE
64 THREADLOCAL u32 __msan_origin_tls;
65
66 static THREADLOCAL int is_in_symbolizer;
67
68 extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
69
70 int __msan_get_track_origins() {
71 return &__msan_track_origins ? __msan_track_origins : 0;
72 }
73
74 extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
75
76 namespace __msan {
77
78 void EnterSymbolizer() { ++is_in_symbolizer; }
79 void ExitSymbolizer() { --is_in_symbolizer; }
80 bool IsInSymbolizer() { return is_in_symbolizer; }
81
82 static Flags msan_flags;
83
84 Flags *flags() {
85 return &msan_flags;
86 }
87
88 int msan_inited = 0;
89 bool msan_init_is_running;
90
91 int msan_report_count = 0;
92
93 // Array of stack origins.
94 // FIXME: make it resizable.
95 static const uptr kNumStackOriginDescrs = 1024 * 1024;
96 static const char *StackOriginDescr[kNumStackOriginDescrs];
97 static uptr StackOriginPC[kNumStackOriginDescrs];
98 static atomic_uint32_t NumStackOriginDescrs;
99
100 void Flags::SetDefaults() {
101 #define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
102 #include "msan_flags.inc"
103 #undef MSAN_FLAG
104 }
105
106 // keep_going is an old name for halt_on_error,
107 // and it has inverse meaning.
108 class FlagHandlerKeepGoing : public FlagHandlerBase {
109 bool *halt_on_error_;
110
111 public:
112 explicit FlagHandlerKeepGoing(bool *halt_on_error)
113 : halt_on_error_(halt_on_error) {}
114 bool Parse(const char *value) final {
115 bool tmp;
116 FlagHandler<bool> h(&tmp);
117 if (!h.Parse(value)) return false;
118 *halt_on_error_ = !tmp;
119 return true;
120 }
121 };
122
123 static void RegisterMsanFlags(FlagParser *parser, Flags *f) {
124 #define MSAN_FLAG(Type, Name, DefaultValue, Description) \
125 RegisterFlag(parser, #Name, Description, &f->Name);
126 #include "msan_flags.inc"
127 #undef MSAN_FLAG
128
129 FlagHandlerKeepGoing *fh_keep_going = new (FlagParser::Alloc) // NOLINT
130 FlagHandlerKeepGoing(&f->halt_on_error);
131 parser->RegisterHandler("keep_going", fh_keep_going,
132 "deprecated, use halt_on_error");
133 }
134
135 static void InitializeFlags() {
136 SetCommonFlagsDefaults();
137 {
138 CommonFlags cf;
139 cf.CopyFrom(*common_flags());
140 cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
141 cf.malloc_context_size = 20;
142 cf.handle_ioctl = true;
143 // FIXME: test and enable.
144 cf.check_printf = false;
145 cf.intercept_tls_get_addr = true;
146 cf.exitcode = 77;
147 OverrideCommonFlags(cf);
148 }
149
150 Flags *f = flags();
151 f->SetDefaults();
152
153 FlagParser parser;
154 RegisterMsanFlags(&parser, f);
155 RegisterCommonFlags(&parser);
156
157 #if MSAN_CONTAINS_UBSAN
158 __ubsan::Flags *uf = __ubsan::flags();
159 uf->SetDefaults();
160
161 FlagParser ubsan_parser;
162 __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
163 RegisterCommonFlags(&ubsan_parser);
164 #endif
165
166 // Override from user-specified string.
167 if (__msan_default_options)
168 parser.ParseString(__msan_default_options());
169 #if MSAN_CONTAINS_UBSAN
170 const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
171 ubsan_parser.ParseString(ubsan_default_options);
172 #endif
173
174 const char *msan_options = GetEnv("MSAN_OPTIONS");
175 parser.ParseString(msan_options);
176 #if MSAN_CONTAINS_UBSAN
177 ubsan_parser.ParseString(GetEnv("UBSAN_OPTIONS"));
178 #endif
179 VPrintf(1, "MSAN_OPTIONS: %s\n", msan_options ? msan_options : "<empty>");
180
181 InitializeCommonFlags();
182
183 if (Verbosity()) ReportUnrecognizedFlags();
184
185 if (common_flags()->help) parser.PrintFlagDescriptions();
186
187 // Check if deprecated exit_code MSan flag is set.
188 if (f->exit_code != -1) {
189 if (Verbosity())
190 Printf("MSAN_OPTIONS=exit_code is deprecated! "
191 "Please use MSAN_OPTIONS=exitcode instead.\n");
192 CommonFlags cf;
193 cf.CopyFrom(*common_flags());
194 cf.exitcode = f->exit_code;
195 OverrideCommonFlags(cf);
196 }
197
198 // Check flag values:
199 if (f->origin_history_size < 0 ||
200 f->origin_history_size > Origin::kMaxDepth) {
201 Printf(
202 "Origin history size invalid: %d. Must be 0 (unlimited) or in [1, %d] "
203 "range.\n",
204 f->origin_history_size, Origin::kMaxDepth);
205 Die();
206 }
207 // Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
208 // StackDepotHandle::inc_use_count_unsafe.
209 if (f->origin_history_per_stack_limit < 0 ||
210 f->origin_history_per_stack_limit > kStackDepotMaxUseCount / 2) {
211 Printf(
212 "Origin per-stack limit invalid: %d. Must be 0 (unlimited) or in [1, "
213 "%d] range.\n",
214 f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
215 Die();
216 }
217 if (f->store_context_size < 1) f->store_context_size = 1;
218 }
219
220 void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
221 bool request_fast_unwind) {
222 MsanThread *t = GetCurrentThread();
223 if (!t || !StackTrace::WillUseFastUnwind(request_fast_unwind)) {
224 // Block reports from our interceptors during _Unwind_Backtrace.
225 SymbolizerScope sym_scope;
226 return stack->Unwind(max_s, pc, bp, nullptr, 0, 0, request_fast_unwind);
227 }
228 stack->Unwind(max_s, pc, bp, nullptr, t->stack_top(), t->stack_bottom(),
229 request_fast_unwind);
230 }
231
232 void PrintWarning(uptr pc, uptr bp) {
233 PrintWarningWithOrigin(pc, bp, __msan_origin_tls);
234 }
235
236 void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin) {
237 if (msan_expect_umr) {
238 // Printf("Expected UMR\n");
239 __msan_origin_tls = origin;
240 msan_expected_umr_found = 1;
241 return;
242 }
243
244 ++msan_report_count;
245
246 GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
247
248 u32 report_origin =
249 (__msan_get_track_origins() && Origin::isValidId(origin)) ? origin : 0;
250 ReportUMR(&stack, report_origin);
251
252 if (__msan_get_track_origins() && !Origin::isValidId(origin)) {
253 Printf(
254 " ORIGIN: invalid (%x). Might be a bug in MemorySanitizer origin "
255 "tracking.\n This could still be a bug in your code, too!\n",
256 origin);
257 }
258 }
259
260 void UnpoisonParam(uptr n) {
261 internal_memset(__msan_param_tls, 0, n * sizeof(*__msan_param_tls));
262 }
263
264 // Backup MSan runtime TLS state.
265 // Implementation must be async-signal-safe.
266 // Instances of this class may live on the signal handler stack, and data size
267 // may be an issue.
268 void ScopedThreadLocalStateBackup::Backup() {
269 va_arg_overflow_size_tls = __msan_va_arg_overflow_size_tls;
270 }
271
272 void ScopedThreadLocalStateBackup::Restore() {
273 // A lame implementation that only keeps essential state and resets the rest.
274 __msan_va_arg_overflow_size_tls = va_arg_overflow_size_tls;
275
276 internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
277 internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
278 internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
279
280 if (__msan_get_track_origins()) {
281 internal_memset(&__msan_retval_origin_tls, 0,
282 sizeof(__msan_retval_origin_tls));
283 internal_memset(__msan_param_origin_tls, 0,
284 sizeof(__msan_param_origin_tls));
285 }
286 }
287
288 void UnpoisonThreadLocalState() {
289 }
290
291 const char *GetStackOriginDescr(u32 id, uptr *pc) {
292 CHECK_LT(id, kNumStackOriginDescrs);
293 if (pc) *pc = StackOriginPC[id];
294 return StackOriginDescr[id];
295 }
296
297 u32 ChainOrigin(u32 id, StackTrace *stack) {
298 MsanThread *t = GetCurrentThread();
299 if (t && t->InSignalHandler())
300 return id;
301
302 Origin o = Origin::FromRawId(id);
303 stack->tag = StackTrace::TAG_UNKNOWN;
304 Origin chained = Origin::CreateChainedOrigin(o, stack);
305 return chained.raw_id();
306 }
307
308 } // namespace __msan
309
310 // Interface.
311
312 using namespace __msan;
313
314 #define MSAN_MAYBE_WARNING(type, size) \
315 void __msan_maybe_warning_##size(type s, u32 o) { \
316 GET_CALLER_PC_BP_SP; \
317 (void) sp; \
318 if (UNLIKELY(s)) { \
319 PrintWarningWithOrigin(pc, bp, o); \
320 if (__msan::flags()->halt_on_error) { \
321 Printf("Exiting\n"); \
322 Die(); \
323 } \
324 } \
325 }
326
327 MSAN_MAYBE_WARNING(u8, 1)
328 MSAN_MAYBE_WARNING(u16, 2)
329 MSAN_MAYBE_WARNING(u32, 4)
330 MSAN_MAYBE_WARNING(u64, 8)
331
332 #define MSAN_MAYBE_STORE_ORIGIN(type, size) \
333 void __msan_maybe_store_origin_##size(type s, void *p, u32 o) { \
334 if (UNLIKELY(s)) { \
335 if (__msan_get_track_origins() > 1) { \
336 GET_CALLER_PC_BP_SP; \
337 (void) sp; \
338 GET_STORE_STACK_TRACE_PC_BP(pc, bp); \
339 o = ChainOrigin(o, &stack); \
340 } \
341 *(u32 *)MEM_TO_ORIGIN((uptr)p & ~3UL) = o; \
342 } \
343 }
344
345 MSAN_MAYBE_STORE_ORIGIN(u8, 1)
346 MSAN_MAYBE_STORE_ORIGIN(u16, 2)
347 MSAN_MAYBE_STORE_ORIGIN(u32, 4)
348 MSAN_MAYBE_STORE_ORIGIN(u64, 8)
349
350 void __msan_warning() {
351 GET_CALLER_PC_BP_SP;
352 (void)sp;
353 PrintWarning(pc, bp);
354 if (__msan::flags()->halt_on_error) {
355 if (__msan::flags()->print_stats)
356 ReportStats();
357 Printf("Exiting\n");
358 Die();
359 }
360 }
361
362 void __msan_warning_noreturn() {
363 GET_CALLER_PC_BP_SP;
364 (void)sp;
365 PrintWarning(pc, bp);
366 if (__msan::flags()->print_stats)
367 ReportStats();
368 Printf("Exiting\n");
369 Die();
370 }
371
372 void __msan_init() {
373 CHECK(!msan_init_is_running);
374 if (msan_inited) return;
375 msan_init_is_running = 1;
376 SanitizerToolName = "MemorySanitizer";
377
378 AvoidCVE_2016_2143();
379 InitTlsSize();
380
381 CacheBinaryName();
382 InitializeFlags();
383
384 __sanitizer_set_report_path(common_flags()->log_path);
385
386 InitializeInterceptors();
387 InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
388
389 DisableCoreDumperIfNecessary();
390 if (StackSizeIsUnlimited()) {
391 VPrintf(1, "Unlimited stack, doing reexec\n");
392 // A reasonably large stack size. It is bigger than the usual 8Mb, because,
393 // well, the program could have been run with unlimited stack for a reason.
394 SetStackSizeLimitInBytes(32 * 1024 * 1024);
395 ReExec();
396 }
397
398 __msan_clear_on_return();
399 if (__msan_get_track_origins())
400 VPrintf(1, "msan_track_origins\n");
401 if (!InitShadow(__msan_get_track_origins())) {
402 Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n");
403 Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
404 Printf("FATAL: Disabling ASLR is known to cause this error.\n");
405 Printf("FATAL: If running under GDB, try "
406 "'set disable-randomization off'.\n");
407 DumpProcessMap();
408 Die();
409 }
410
411 Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
412
413 InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
414
415 MsanTSDInit(MsanTSDDtor);
416
417 MsanAllocatorInit();
418
419 MsanThread *main_thread = MsanThread::Create(nullptr, nullptr);
420 SetCurrentThread(main_thread);
421 main_thread->ThreadStart();
422
423 #if MSAN_CONTAINS_UBSAN
424 __ubsan::InitAsPlugin();
425 #endif
426
427 VPrintf(1, "MemorySanitizer init done\n");
428
429 msan_init_is_running = 0;
430 msan_inited = 1;
431 }
432
433 void __msan_set_keep_going(int keep_going) {
434 flags()->halt_on_error = !keep_going;
435 }
436
437 void __msan_set_expect_umr(int expect_umr) {
438 if (expect_umr) {
439 msan_expected_umr_found = 0;
440 } else if (!msan_expected_umr_found) {
441 GET_CALLER_PC_BP_SP;
442 (void)sp;
443 GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
444 ReportExpectedUMRNotFound(&stack);
445 Die();
446 }
447 msan_expect_umr = expect_umr;
448 }
449
450 void __msan_print_shadow(const void *x, uptr size) {
451 if (!MEM_IS_APP(x)) {
452 Printf("Not a valid application address: %p\n", x);
453 return;
454 }
455
456 DescribeMemoryRange(x, size);
457 }
458
459 void __msan_dump_shadow(const void *x, uptr size) {
460 if (!MEM_IS_APP(x)) {
461 Printf("Not a valid application address: %p\n", x);
462 return;
463 }
464
465 unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x);
466 for (uptr i = 0; i < size; i++)
467 Printf("%x%x ", s[i] >> 4, s[i] & 0xf);
468 Printf("\n");
469 }
470
471 sptr __msan_test_shadow(const void *x, uptr size) {
472 if (!MEM_IS_APP(x)) return -1;
473 unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x);
474 for (uptr i = 0; i < size; ++i)
475 if (s[i])
476 return i;
477 return -1;
478 }
479
480 void __msan_check_mem_is_initialized(const void *x, uptr size) {
481 if (!__msan::flags()->report_umrs) return;
482 sptr offset = __msan_test_shadow(x, size);
483 if (offset < 0)
484 return;
485
486 GET_CALLER_PC_BP_SP;
487 (void)sp;
488 ReportUMRInsideAddressRange(__func__, x, size, offset);
489 __msan::PrintWarningWithOrigin(pc, bp,
490 __msan_get_origin(((const char *)x) + offset));
491 if (__msan::flags()->halt_on_error) {
492 Printf("Exiting\n");
493 Die();
494 }
495 }
496
497 int __msan_set_poison_in_malloc(int do_poison) {
498 int old = flags()->poison_in_malloc;
499 flags()->poison_in_malloc = do_poison;
500 return old;
501 }
502
503 int __msan_has_dynamic_component() { return false; }
504
505 NOINLINE
506 void __msan_clear_on_return() {
507 __msan_param_tls[0] = 0;
508 }
509
510 void __msan_partial_poison(const void* data, void* shadow, uptr size) {
511 internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size);
512 }
513
514 void __msan_load_unpoisoned(const void *src, uptr size, void *dst) {
515 internal_memcpy(dst, src, size);
516 __msan_unpoison(dst, size);
517 }
518
519 void __msan_set_origin(const void *a, uptr size, u32 origin) {
520 if (__msan_get_track_origins()) SetOrigin(a, size, origin);
521 }
522
523 // 'descr' is created at compile time and contains '----' in the beginning.
524 // When we see descr for the first time we replace '----' with a uniq id
525 // and set the origin to (id | (31-th bit)).
526 void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
527 __msan_set_alloca_origin4(a, size, descr, 0);
528 }
529
530 void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
531 static const u32 dash = '-';
532 static const u32 first_timer =
533 dash + (dash << 8) + (dash << 16) + (dash << 24);
534 u32 *id_ptr = (u32*)descr;
535 bool print = false; // internal_strstr(descr + 4, "AllocaTOTest") != 0;
536 u32 id = *id_ptr;
537 if (id == first_timer) {
538 u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
539 CHECK_LT(idx, kNumStackOriginDescrs);
540 StackOriginDescr[idx] = descr + 4;
541 #if SANITIZER_PPC64V1
542 // On PowerPC64 ELFv1, the address of a function actually points to a
543 // three-doubleword data structure with the first field containing
544 // the address of the function's code.
545 if (pc)
546 pc = *reinterpret_cast<uptr*>(pc);
547 #endif
548 StackOriginPC[idx] = pc;
549 id = Origin::CreateStackOrigin(idx).raw_id();
550 *id_ptr = id;
551 if (print)
552 Printf("First time: idx=%d id=%d %s %p \n", idx, id, descr + 4, pc);
553 }
554 if (print)
555 Printf("__msan_set_alloca_origin: descr=%s id=%x\n", descr + 4, id);
556 __msan_set_origin(a, size, id);
557 }
558
559 u32 __msan_chain_origin(u32 id) {
560 GET_CALLER_PC_BP_SP;
561 (void)sp;
562 GET_STORE_STACK_TRACE_PC_BP(pc, bp);
563 return ChainOrigin(id, &stack);
564 }
565
566 u32 __msan_get_origin(const void *a) {
567 if (!__msan_get_track_origins()) return 0;
568 uptr x = (uptr)a;
569 uptr aligned = x & ~3ULL;
570 uptr origin_ptr = MEM_TO_ORIGIN(aligned);
571 return *(u32*)origin_ptr;
572 }
573
574 int __msan_origin_is_descendant_or_same(u32 this_id, u32 prev_id) {
575 Origin o = Origin::FromRawId(this_id);
576 while (o.raw_id() != prev_id && o.isChainedOrigin())
577 o = o.getNextChainedOrigin(nullptr);
578 return o.raw_id() == prev_id;
579 }
580
581 u32 __msan_get_umr_origin() {
582 return __msan_origin_tls;
583 }
584
585 u16 __sanitizer_unaligned_load16(const uu16 *p) {
586 *(uu16 *)&__msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p);
587 if (__msan_get_track_origins())
588 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
589 return *p;
590 }
591 u32 __sanitizer_unaligned_load32(const uu32 *p) {
592 *(uu32 *)&__msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p);
593 if (__msan_get_track_origins())
594 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
595 return *p;
596 }
597 u64 __sanitizer_unaligned_load64(const uu64 *p) {
598 __msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p);
599 if (__msan_get_track_origins())
600 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
601 return *p;
602 }
603 void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
604 u16 s = *(uu16 *)&__msan_param_tls[1];
605 *(uu16 *)MEM_TO_SHADOW((uptr)p) = s;
606 if (s && __msan_get_track_origins())
607 if (uu32 o = __msan_param_origin_tls[2])
608 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
609 *p = x;
610 }
611 void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
612 u32 s = *(uu32 *)&__msan_param_tls[1];
613 *(uu32 *)MEM_TO_SHADOW((uptr)p) = s;
614 if (s && __msan_get_track_origins())
615 if (uu32 o = __msan_param_origin_tls[2])
616 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
617 *p = x;
618 }
619 void __sanitizer_unaligned_store64(uu64 *p, u64 x) {
620 u64 s = __msan_param_tls[1];
621 *(uu64 *)MEM_TO_SHADOW((uptr)p) = s;
622 if (s && __msan_get_track_origins())
623 if (uu32 o = __msan_param_origin_tls[2])
624 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
625 *p = x;
626 }
627
628 void __msan_set_death_callback(void (*callback)(void)) {
629 SetUserDieCallback(callback);
630 }
631
632 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
633 extern "C" {
634 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
635 const char* __msan_default_options() { return ""; }
636 } // extern "C"
637 #endif
638
639 extern "C" {
640 SANITIZER_INTERFACE_ATTRIBUTE
641 void __sanitizer_print_stack_trace() {
642 GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
643 stack.Print();
644 }
645 } // extern "C"