asan_rtl.cc revision 2a3619ecbb56e828090b4c40ece28550f68c94de
1//===-- asan_rtl.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 AddressSanitizer, an address sanity checker. 11// 12// Main file of the ASan run-time library. 13//===----------------------------------------------------------------------===// 14#include "asan_allocator.h" 15#include "asan_interceptors.h" 16#include "asan_internal.h" 17#include "asan_mapping.h" 18#include "asan_poisoning.h" 19#include "asan_report.h" 20#include "asan_stack.h" 21#include "asan_stats.h" 22#include "asan_thread.h" 23#include "sanitizer_common/sanitizer_atomic.h" 24#include "sanitizer_common/sanitizer_flags.h" 25#include "sanitizer_common/sanitizer_libc.h" 26#include "sanitizer_common/sanitizer_symbolizer.h" 27 28namespace __asan { 29 30uptr AsanMappingProfile[kAsanMappingProfileSize]; 31 32static void AsanDie() { 33 static atomic_uint32_t num_calls; 34 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 35 // Don't die twice - run a busy loop. 36 while (1) { } 37 } 38 if (flags()->sleep_before_dying) { 39 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); 40 SleepForSeconds(flags()->sleep_before_dying); 41 } 42 if (flags()->unmap_shadow_on_exit) { 43 if (kMidMemBeg) { 44 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); 45 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); 46 } else { 47 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 48 } 49 } 50 if (death_callback) 51 death_callback(); 52 if (flags()->abort_on_error) 53 Abort(); 54 internal__exit(flags()->exitcode); 55} 56 57static void AsanCheckFailed(const char *file, int line, const char *cond, 58 u64 v1, u64 v2) { 59 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", 60 file, line, cond, (uptr)v1, (uptr)v2); 61 // FIXME: check for infinite recursion without a thread-local counter here. 62 PRINT_CURRENT_STACK(); 63 Die(); 64} 65 66// -------------------------- Flags ------------------------- {{{1 67static const int kDeafultMallocContextSize = 30; 68 69static Flags asan_flags; 70 71Flags *flags() { 72 return &asan_flags; 73} 74 75static const char *MaybeCallAsanDefaultOptions() { 76 return (&__asan_default_options) ? __asan_default_options() : ""; 77} 78 79static const char *MaybeUseAsanDefaultOptionsCompileDefiniton() { 80#ifdef ASAN_DEFAULT_OPTIONS 81// Stringize the macro value. 82# define ASAN_STRINGIZE(x) #x 83# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options) 84 return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS); 85#else 86 return ""; 87#endif 88} 89 90static void ParseFlagsFromString(Flags *f, const char *str) { 91 ParseFlag(str, &f->quarantine_size, "quarantine_size"); 92 ParseFlag(str, &f->symbolize, "symbolize"); 93 ParseFlag(str, &f->verbosity, "verbosity"); 94 ParseFlag(str, &f->redzone, "redzone"); 95 CHECK(f->redzone >= 16); 96 CHECK(IsPowerOfTwo(f->redzone)); 97 98 ParseFlag(str, &f->debug, "debug"); 99 ParseFlag(str, &f->report_globals, "report_globals"); 100 ParseFlag(str, &f->check_initialization_order, "check_initialization_order"); 101 ParseFlag(str, &f->malloc_context_size, "malloc_context_size"); 102 CHECK((uptr)f->malloc_context_size <= kStackTraceMax); 103 104 ParseFlag(str, &f->replace_str, "replace_str"); 105 ParseFlag(str, &f->replace_intrin, "replace_intrin"); 106 ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free"); 107 ParseFlag(str, &f->use_fake_stack, "use_fake_stack"); 108 ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size"); 109 ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte"); 110 ParseFlag(str, &f->exitcode, "exitcode"); 111 ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning"); 112 ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying"); 113 ParseFlag(str, &f->handle_segv, "handle_segv"); 114 ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack"); 115 ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size"); 116 ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit"); 117 ParseFlag(str, &f->abort_on_error, "abort_on_error"); 118 ParseFlag(str, &f->print_stats, "print_stats"); 119 ParseFlag(str, &f->print_legend, "print_legend"); 120 ParseFlag(str, &f->atexit, "atexit"); 121 ParseFlag(str, &f->disable_core, "disable_core"); 122 ParseFlag(str, &f->strip_path_prefix, "strip_path_prefix"); 123 ParseFlag(str, &f->allow_reexec, "allow_reexec"); 124 ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history"); 125 ParseFlag(str, &f->log_path, "log_path"); 126 ParseFlag(str, &f->fast_unwind_on_fatal, "fast_unwind_on_fatal"); 127 ParseFlag(str, &f->fast_unwind_on_malloc, "fast_unwind_on_malloc"); 128 ParseFlag(str, &f->poison_heap, "poison_heap"); 129 ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch"); 130 ParseFlag(str, &f->use_stack_depot, "use_stack_depot"); 131 ParseFlag(str, &f->strict_memcmp, "strict_memcmp"); 132} 133 134static const char *asan_external_symbolizer; 135 136void InitializeFlags(Flags *f, const char *env) { 137 internal_memset(f, 0, sizeof(*f)); 138 139 f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28; 140 f->symbolize = (asan_external_symbolizer != 0); 141 f->verbosity = 0; 142 f->redzone = ASAN_ALLOCATOR_VERSION == 2 ? 16 : (ASAN_LOW_MEMORY) ? 64 : 128; 143 f->debug = false; 144 f->report_globals = 1; 145 f->check_initialization_order = false; 146 f->malloc_context_size = kDeafultMallocContextSize; 147 f->replace_str = true; 148 f->replace_intrin = true; 149 f->mac_ignore_invalid_free = false; 150 f->use_fake_stack = true; 151 f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K. 152 f->malloc_fill_byte = 0xbe; 153 f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 154 f->allow_user_poisoning = true; 155 f->sleep_before_dying = 0; 156 f->handle_segv = ASAN_NEEDS_SEGV; 157 f->use_sigaltstack = false; 158 f->check_malloc_usable_size = true; 159 f->unmap_shadow_on_exit = false; 160 f->abort_on_error = false; 161 f->print_stats = false; 162 f->print_legend = true; 163 f->atexit = false; 164 f->disable_core = (SANITIZER_WORDSIZE == 64); 165 f->strip_path_prefix = ""; 166 f->allow_reexec = true; 167 f->print_full_thread_history = true; 168 f->log_path = 0; 169 f->fast_unwind_on_fatal = false; 170 f->fast_unwind_on_malloc = true; 171 f->poison_heap = true; 172 // Turn off alloc/dealloc mismatch checker on Mac for now. 173 // TODO(glider): Fix known issues and enable this back. 174 f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0);; 175 f->use_stack_depot = true; // Only affects allocator2. 176 f->strict_memcmp = true; 177 178 // Override from compile definition. 179 ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton()); 180 181 // Override from user-specified string. 182 ParseFlagsFromString(f, MaybeCallAsanDefaultOptions()); 183 if (flags()->verbosity) { 184 Report("Using the defaults from __asan_default_options: %s\n", 185 MaybeCallAsanDefaultOptions()); 186 } 187 188 // Override from command line. 189 ParseFlagsFromString(f, env); 190} 191 192// -------------------------- Globals --------------------- {{{1 193int asan_inited; 194bool asan_init_is_running; 195void (*death_callback)(void); 196 197#if !ASAN_FIXED_MAPPING 198uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; 199#endif 200 201// -------------------------- Misc ---------------- {{{1 202void ShowStatsAndAbort() { 203 __asan_print_accumulated_stats(); 204 Die(); 205} 206 207// ---------------------- mmap -------------------- {{{1 208// Reserve memory range [beg, end]. 209static void ReserveShadowMemoryRange(uptr beg, uptr end) { 210 CHECK((beg % GetPageSizeCached()) == 0); 211 CHECK(((end + 1) % GetPageSizeCached()) == 0); 212 uptr size = end - beg + 1; 213 void *res = MmapFixedNoReserve(beg, size); 214 if (res != (void*)beg) { 215 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " 216 "Perhaps you're using ulimit -v\n", size); 217 Abort(); 218 } 219} 220 221// --------------- LowLevelAllocateCallbac ---------- {{{1 222static void OnLowLevelAllocate(uptr ptr, uptr size) { 223 PoisonShadow(ptr, size, kAsanInternalHeapMagic); 224} 225 226// -------------------------- Run-time entry ------------------- {{{1 227// exported functions 228#define ASAN_REPORT_ERROR(type, is_write, size) \ 229extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 230void __asan_report_ ## type ## size(uptr addr); \ 231void __asan_report_ ## type ## size(uptr addr) { \ 232 GET_CALLER_PC_BP_SP; \ 233 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 234} 235 236ASAN_REPORT_ERROR(load, false, 1) 237ASAN_REPORT_ERROR(load, false, 2) 238ASAN_REPORT_ERROR(load, false, 4) 239ASAN_REPORT_ERROR(load, false, 8) 240ASAN_REPORT_ERROR(load, false, 16) 241ASAN_REPORT_ERROR(store, true, 1) 242ASAN_REPORT_ERROR(store, true, 2) 243ASAN_REPORT_ERROR(store, true, 4) 244ASAN_REPORT_ERROR(store, true, 8) 245ASAN_REPORT_ERROR(store, true, 16) 246 247#define ASAN_REPORT_ERROR_N(type, is_write) \ 248extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 249void __asan_report_ ## type ## _n(uptr addr, uptr size); \ 250void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ 251 GET_CALLER_PC_BP_SP; \ 252 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 253} 254 255ASAN_REPORT_ERROR_N(load, false) 256ASAN_REPORT_ERROR_N(store, true) 257 258// Force the linker to keep the symbols for various ASan interface functions. 259// We want to keep those in the executable in order to let the instrumented 260// dynamic libraries access the symbol even if it is not used by the executable 261// itself. This should help if the build system is removing dead code at link 262// time. 263static NOINLINE void force_interface_symbols() { 264 volatile int fake_condition = 0; // prevent dead condition elimination. 265 // __asan_report_* functions are noreturn, so we need a switch to prevent 266 // the compiler from removing any of them. 267 switch (fake_condition) { 268 case 1: __asan_report_load1(0); break; 269 case 2: __asan_report_load2(0); break; 270 case 3: __asan_report_load4(0); break; 271 case 4: __asan_report_load8(0); break; 272 case 5: __asan_report_load16(0); break; 273 case 6: __asan_report_store1(0); break; 274 case 7: __asan_report_store2(0); break; 275 case 8: __asan_report_store4(0); break; 276 case 9: __asan_report_store8(0); break; 277 case 10: __asan_report_store16(0); break; 278 case 12: __asan_register_globals(0, 0); break; 279 case 13: __asan_unregister_globals(0, 0); break; 280 case 14: __asan_set_death_callback(0); break; 281 case 15: __asan_set_error_report_callback(0); break; 282 case 16: __asan_handle_no_return(); break; 283 case 17: __asan_address_is_poisoned(0); break; 284 case 18: __asan_get_allocated_size(0); break; 285 case 19: __asan_get_current_allocated_bytes(); break; 286 case 20: __asan_get_estimated_allocated_size(0); break; 287 case 21: __asan_get_free_bytes(); break; 288 case 22: __asan_get_heap_size(); break; 289 case 23: __asan_get_ownership(0); break; 290 case 24: __asan_get_unmapped_bytes(); break; 291 case 25: __asan_poison_memory_region(0, 0); break; 292 case 26: __asan_unpoison_memory_region(0, 0); break; 293 case 27: __asan_set_error_exit_code(0); break; 294 case 28: __asan_stack_free(0, 0, 0); break; 295 case 29: __asan_stack_malloc(0, 0); break; 296 case 30: __asan_before_dynamic_init(0); break; 297 case 31: __asan_after_dynamic_init(); break; 298 case 32: __asan_poison_stack_memory(0, 0); break; 299 case 33: __asan_unpoison_stack_memory(0, 0); break; 300 case 34: __asan_region_is_poisoned(0, 0); break; 301 case 35: __asan_describe_address(0); break; 302 } 303} 304 305static void asan_atexit() { 306 Printf("AddressSanitizer exit stats:\n"); 307 __asan_print_accumulated_stats(); 308 // Print AsanMappingProfile. 309 for (uptr i = 0; i < kAsanMappingProfileSize; i++) { 310 if (AsanMappingProfile[i] == 0) continue; 311 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); 312 } 313} 314 315static void InitializeHighMemEnd() { 316#if !ASAN_FIXED_MAPPING 317#if SANITIZER_WORDSIZE == 64 318# if defined(__powerpc64__) 319 // FIXME: 320 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 321 // We somehow need to figure our which one we are using now and choose 322 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 323 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 324 // of the address space, so simply checking the stack address is not enough. 325 kHighMemEnd = (1ULL << 44) - 1; // 0x00000fffffffffffUL 326# else 327 kHighMemEnd = (1ULL << 47) - 1; // 0x00007fffffffffffUL; 328# endif 329#else // SANITIZER_WORDSIZE == 32 330 kHighMemEnd = (1ULL << 32) - 1; // 0xffffffff; 331#endif // SANITIZER_WORDSIZE 332#endif // !ASAN_FIXED_MAPPING 333} 334 335static void ProtectGap(uptr a, uptr size) { 336 CHECK_EQ(a, (uptr)Mprotect(a, size)); 337} 338 339static void PrintAddressSpaceLayout() { 340 Printf("|| `[%p, %p]` || HighMem ||\n", 341 (void*)kHighMemBeg, (void*)kHighMemEnd); 342 Printf("|| `[%p, %p]` || HighShadow ||\n", 343 (void*)kHighShadowBeg, (void*)kHighShadowEnd); 344 if (kMidMemBeg) { 345 Printf("|| `[%p, %p]` || ShadowGap3 ||\n", 346 (void*)kShadowGap3Beg, (void*)kShadowGap3End); 347 Printf("|| `[%p, %p]` || MidMem ||\n", 348 (void*)kMidMemBeg, (void*)kMidMemEnd); 349 Printf("|| `[%p, %p]` || ShadowGap2 ||\n", 350 (void*)kShadowGap2Beg, (void*)kShadowGap2End); 351 Printf("|| `[%p, %p]` || MidShadow ||\n", 352 (void*)kMidShadowBeg, (void*)kMidShadowEnd); 353 } 354 Printf("|| `[%p, %p]` || ShadowGap ||\n", 355 (void*)kShadowGapBeg, (void*)kShadowGapEnd); 356 if (kLowShadowBeg) { 357 Printf("|| `[%p, %p]` || LowShadow ||\n", 358 (void*)kLowShadowBeg, (void*)kLowShadowEnd); 359 Printf("|| `[%p, %p]` || LowMem ||\n", 360 (void*)kLowMemBeg, (void*)kLowMemEnd); 361 } 362 Printf("MemToShadow(shadow): %p %p %p %p", 363 (void*)MEM_TO_SHADOW(kLowShadowBeg), 364 (void*)MEM_TO_SHADOW(kLowShadowEnd), 365 (void*)MEM_TO_SHADOW(kHighShadowBeg), 366 (void*)MEM_TO_SHADOW(kHighShadowEnd)); 367 if (kMidMemBeg) { 368 Printf(" %p %p", 369 (void*)MEM_TO_SHADOW(kMidShadowBeg), 370 (void*)MEM_TO_SHADOW(kMidShadowEnd)); 371 } 372 Printf("\n"); 373 Printf("red_zone=%zu\n", (uptr)flags()->redzone); 374 Printf("malloc_context_size=%zu\n", (uptr)flags()->malloc_context_size); 375 376 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 377 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 378 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 379 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 380 if (kMidMemBeg) 381 CHECK(kMidShadowBeg > kLowShadowEnd && 382 kMidMemBeg > kMidShadowEnd && 383 kHighShadowBeg > kMidMemEnd); 384} 385 386} // namespace __asan 387 388// ---------------------- Interface ---------------- {{{1 389using namespace __asan; // NOLINT 390 391#if !SANITIZER_SUPPORTS_WEAK_HOOKS 392extern "C" { 393SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE 394const char* __asan_default_options() { return ""; } 395} // extern "C" 396#endif 397 398int NOINLINE __asan_set_error_exit_code(int exit_code) { 399 int old = flags()->exitcode; 400 flags()->exitcode = exit_code; 401 return old; 402} 403 404void NOINLINE __asan_handle_no_return() { 405 int local_stack; 406 AsanThread *curr_thread = GetCurrentThread(); 407 CHECK(curr_thread); 408 uptr PageSize = GetPageSizeCached(); 409 uptr top = curr_thread->stack_top(); 410 uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1); 411 PoisonShadow(bottom, top - bottom, 0); 412} 413 414void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 415 death_callback = callback; 416} 417 418void __asan_init() { 419 if (asan_inited) return; 420 SanitizerToolName = "AddressSanitizer"; 421 CHECK(!asan_init_is_running && "ASan init calls itself!"); 422 asan_init_is_running = true; 423 InitializeHighMemEnd(); 424 425 // Make sure we are not statically linked. 426 AsanDoesNotSupportStaticLinkage(); 427 428 // Install tool-specific callbacks in sanitizer_common. 429 SetDieCallback(AsanDie); 430 SetCheckFailedCallback(AsanCheckFailed); 431 SetPrintfAndReportCallback(AppendToErrorMessageBuffer); 432 433 // Check if external symbolizer is defined before parsing the flags. 434 asan_external_symbolizer = GetEnv("ASAN_SYMBOLIZER_PATH"); 435 // Initialize flags. This must be done early, because most of the 436 // initialization steps look at flags(). 437 const char *options = GetEnv("ASAN_OPTIONS"); 438 InitializeFlags(flags(), options); 439 __sanitizer_set_report_path(flags()->log_path); 440 441 if (flags()->verbosity && options) { 442 Report("Parsed ASAN_OPTIONS: %s\n", options); 443 } 444 445 // Re-exec ourselves if we need to set additional env or command line args. 446 MaybeReexec(); 447 448 // Setup internal allocator callback. 449 SetLowLevelAllocateCallback(OnLowLevelAllocate); 450 451 if (flags()->atexit) { 452 Atexit(asan_atexit); 453 } 454 455 // interceptors 456 InitializeAsanInterceptors(); 457 458 ReplaceSystemMalloc(); 459 ReplaceOperatorsNewAndDelete(); 460 461 uptr shadow_start = kLowShadowBeg; 462 if (kLowShadowBeg) shadow_start -= GetMmapGranularity(); 463 uptr shadow_end = kHighShadowEnd; 464 bool full_shadow_is_available = 465 MemoryRangeIsAvailable(shadow_start, shadow_end); 466 467#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING 468 if (!full_shadow_is_available) { 469 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; 470 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; 471 } 472#endif 473 474 if (flags()->verbosity) 475 PrintAddressSpaceLayout(); 476 477 if (flags()->disable_core) { 478 DisableCoreDumper(); 479 } 480 481 if (full_shadow_is_available) { 482 // mmap the low shadow plus at least one page at the left. 483 if (kLowShadowBeg) 484 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 485 // mmap the high shadow. 486 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 487 // protect the gap. 488 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 489 } else if (kMidMemBeg && 490 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && 491 MemoryRangeIsAvailable(kMidMemEnd + 1, shadow_end)) { 492 CHECK(kLowShadowBeg != kLowShadowEnd); 493 // mmap the low shadow plus at least one page at the left. 494 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 495 // mmap the mid shadow. 496 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd); 497 // mmap the high shadow. 498 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 499 // protect the gaps. 500 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 501 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); 502 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); 503 } else { 504 Report("Shadow memory range interleaves with an existing memory mapping. " 505 "ASan cannot proceed correctly. ABORTING.\n"); 506 DumpProcessMap(); 507 Die(); 508 } 509 510 InstallSignalHandlers(); 511 // Start symbolizer process if necessary. 512 if (flags()->symbolize && asan_external_symbolizer && 513 asan_external_symbolizer[0]) { 514 InitializeExternalSymbolizer(asan_external_symbolizer); 515 } 516 517 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 518 // should be set to 1 prior to initializing the threads. 519 asan_inited = 1; 520 asan_init_is_running = false; 521 522 // Create main thread. 523 AsanTSDInit(AsanThread::TSDDtor); 524 AsanThread *main_thread = AsanThread::Create(0, 0); 525 CreateThreadContextArgs create_main_args = { main_thread, 0 }; 526 u32 main_tid = asanThreadRegistry().CreateThread( 527 0, true, 0, &create_main_args); 528 CHECK_EQ(0, main_tid); 529 SetCurrentThread(main_thread); 530 main_thread->ThreadStart(GetPid()); 531 force_interface_symbols(); // no-op. 532 533 InitializeAllocator(); 534 535 if (flags()->verbosity) { 536 Report("AddressSanitizer Init done\n"); 537 } 538} 539