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 SetVerbosity(common_flags()->verbosity); 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 InitTlsSize(); 379 380 CacheBinaryName(); 381 InitializeFlags(); 382 383 __sanitizer_set_report_path(common_flags()->log_path); 384 385 InitializeInterceptors(); 386 InstallAtExitHandler(); // Needs __cxa_atexit interceptor. 387 388 DisableCoreDumperIfNecessary(); 389 if (StackSizeIsUnlimited()) { 390 VPrintf(1, "Unlimited stack, doing reexec\n"); 391 // A reasonably large stack size. It is bigger than the usual 8Mb, because, 392 // well, the program could have been run with unlimited stack for a reason. 393 SetStackSizeLimitInBytes(32 * 1024 * 1024); 394 ReExec(); 395 } 396 397 __msan_clear_on_return(); 398 if (__msan_get_track_origins()) 399 VPrintf(1, "msan_track_origins\n"); 400 if (!InitShadow(__msan_get_track_origins())) { 401 Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n"); 402 Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n"); 403 Printf("FATAL: Disabling ASLR is known to cause this error.\n"); 404 Printf("FATAL: If running under GDB, try " 405 "'set disable-randomization off'.\n"); 406 DumpProcessMap(); 407 Die(); 408 } 409 410 Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer); 411 412 InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir); 413 414 MsanTSDInit(MsanTSDDtor); 415 416 MsanAllocatorInit(); 417 418 MsanThread *main_thread = MsanThread::Create(nullptr, nullptr); 419 SetCurrentThread(main_thread); 420 main_thread->ThreadStart(); 421 422 #if MSAN_CONTAINS_UBSAN 423 __ubsan::InitAsPlugin(); 424 #endif 425 426 VPrintf(1, "MemorySanitizer init done\n"); 427 428 msan_init_is_running = 0; 429 msan_inited = 1; 430 } 431 432 void __msan_set_keep_going(int keep_going) { 433 flags()->halt_on_error = !keep_going; 434 } 435 436 void __msan_set_expect_umr(int expect_umr) { 437 if (expect_umr) { 438 msan_expected_umr_found = 0; 439 } else if (!msan_expected_umr_found) { 440 GET_CALLER_PC_BP_SP; 441 (void)sp; 442 GET_FATAL_STACK_TRACE_PC_BP(pc, bp); 443 ReportExpectedUMRNotFound(&stack); 444 Die(); 445 } 446 msan_expect_umr = expect_umr; 447 } 448 449 void __msan_print_shadow(const void *x, uptr size) { 450 if (!MEM_IS_APP(x)) { 451 Printf("Not a valid application address: %p\n", x); 452 return; 453 } 454 455 DescribeMemoryRange(x, size); 456 } 457 458 void __msan_dump_shadow(const void *x, uptr size) { 459 if (!MEM_IS_APP(x)) { 460 Printf("Not a valid application address: %p\n", x); 461 return; 462 } 463 464 unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x); 465 for (uptr i = 0; i < size; i++) { 466 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 467 Printf("%x%x ", s[i] & 0xf, s[i] >> 4); 468 #else 469 Printf("%x%x ", s[i] >> 4, s[i] & 0xf); 470 #endif 471 } 472 Printf("\n"); 473 } 474 475 sptr __msan_test_shadow(const void *x, uptr size) { 476 if (!MEM_IS_APP(x)) return -1; 477 unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x); 478 for (uptr i = 0; i < size; ++i) 479 if (s[i]) 480 return i; 481 return -1; 482 } 483 484 void __msan_check_mem_is_initialized(const void *x, uptr size) { 485 if (!__msan::flags()->report_umrs) return; 486 sptr offset = __msan_test_shadow(x, size); 487 if (offset < 0) 488 return; 489 490 GET_CALLER_PC_BP_SP; 491 (void)sp; 492 ReportUMRInsideAddressRange(__func__, x, size, offset); 493 __msan::PrintWarningWithOrigin(pc, bp, 494 __msan_get_origin(((const char *)x) + offset)); 495 if (__msan::flags()->halt_on_error) { 496 Printf("Exiting\n"); 497 Die(); 498 } 499 } 500 501 int __msan_set_poison_in_malloc(int do_poison) { 502 int old = flags()->poison_in_malloc; 503 flags()->poison_in_malloc = do_poison; 504 return old; 505 } 506 507 int __msan_has_dynamic_component() { return false; } 508 509 NOINLINE 510 void __msan_clear_on_return() { 511 __msan_param_tls[0] = 0; 512 } 513 514 void __msan_partial_poison(const void* data, void* shadow, uptr size) { 515 internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size); 516 } 517 518 void __msan_load_unpoisoned(const void *src, uptr size, void *dst) { 519 internal_memcpy(dst, src, size); 520 __msan_unpoison(dst, size); 521 } 522 523 void __msan_set_origin(const void *a, uptr size, u32 origin) { 524 if (__msan_get_track_origins()) SetOrigin(a, size, origin); 525 } 526 527 // 'descr' is created at compile time and contains '----' in the beginning. 528 // When we see descr for the first time we replace '----' with a uniq id 529 // and set the origin to (id | (31-th bit)). 530 void __msan_set_alloca_origin(void *a, uptr size, char *descr) { 531 __msan_set_alloca_origin4(a, size, descr, 0); 532 } 533 534 void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) { 535 static const u32 dash = '-'; 536 static const u32 first_timer = 537 dash + (dash << 8) + (dash << 16) + (dash << 24); 538 u32 *id_ptr = (u32*)descr; 539 bool print = false; // internal_strstr(descr + 4, "AllocaTOTest") != 0; 540 u32 id = *id_ptr; 541 if (id == first_timer) { 542 u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed); 543 CHECK_LT(idx, kNumStackOriginDescrs); 544 StackOriginDescr[idx] = descr + 4; 545 StackOriginPC[idx] = pc; 546 id = Origin::CreateStackOrigin(idx).raw_id(); 547 *id_ptr = id; 548 if (print) 549 Printf("First time: idx=%d id=%d %s %p \n", idx, id, descr + 4, pc); 550 } 551 if (print) 552 Printf("__msan_set_alloca_origin: descr=%s id=%x\n", descr + 4, id); 553 __msan_set_origin(a, size, id); 554 } 555 556 u32 __msan_chain_origin(u32 id) { 557 GET_CALLER_PC_BP_SP; 558 (void)sp; 559 GET_STORE_STACK_TRACE_PC_BP(pc, bp); 560 return ChainOrigin(id, &stack); 561 } 562 563 u32 __msan_get_origin(const void *a) { 564 if (!__msan_get_track_origins()) return 0; 565 uptr x = (uptr)a; 566 uptr aligned = x & ~3ULL; 567 uptr origin_ptr = MEM_TO_ORIGIN(aligned); 568 return *(u32*)origin_ptr; 569 } 570 571 int __msan_origin_is_descendant_or_same(u32 this_id, u32 prev_id) { 572 Origin o = Origin::FromRawId(this_id); 573 while (o.raw_id() != prev_id && o.isChainedOrigin()) 574 o = o.getNextChainedOrigin(nullptr); 575 return o.raw_id() == prev_id; 576 } 577 578 u32 __msan_get_umr_origin() { 579 return __msan_origin_tls; 580 } 581 582 u16 __sanitizer_unaligned_load16(const uu16 *p) { 583 __msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p); 584 if (__msan_get_track_origins()) 585 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p)); 586 return *p; 587 } 588 u32 __sanitizer_unaligned_load32(const uu32 *p) { 589 __msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p); 590 if (__msan_get_track_origins()) 591 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p)); 592 return *p; 593 } 594 u64 __sanitizer_unaligned_load64(const uu64 *p) { 595 __msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p); 596 if (__msan_get_track_origins()) 597 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p)); 598 return *p; 599 } 600 void __sanitizer_unaligned_store16(uu16 *p, u16 x) { 601 u16 s = __msan_param_tls[1]; 602 *(uu16 *)MEM_TO_SHADOW((uptr)p) = s; 603 if (s && __msan_get_track_origins()) 604 if (uu32 o = __msan_param_origin_tls[2]) 605 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o); 606 *p = x; 607 } 608 void __sanitizer_unaligned_store32(uu32 *p, u32 x) { 609 u32 s = __msan_param_tls[1]; 610 *(uu32 *)MEM_TO_SHADOW((uptr)p) = s; 611 if (s && __msan_get_track_origins()) 612 if (uu32 o = __msan_param_origin_tls[2]) 613 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o); 614 *p = x; 615 } 616 void __sanitizer_unaligned_store64(uu64 *p, u64 x) { 617 u64 s = __msan_param_tls[1]; 618 *(uu64 *)MEM_TO_SHADOW((uptr)p) = s; 619 if (s && __msan_get_track_origins()) 620 if (uu32 o = __msan_param_origin_tls[2]) 621 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o); 622 *p = x; 623 } 624 625 void __msan_set_death_callback(void (*callback)(void)) { 626 SetUserDieCallback(callback); 627 } 628 629 #if !SANITIZER_SUPPORTS_WEAK_HOOKS 630 extern "C" { 631 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE 632 const char* __msan_default_options() { return ""; } 633 } // extern "C" 634 #endif 635 636 extern "C" { 637 SANITIZER_INTERFACE_ATTRIBUTE 638 void __sanitizer_print_stack_trace() { 639 GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME()); 640 stack.Print(); 641 } 642 } // extern "C" 643
