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 #include "lsan/lsan_common.h" 28 29 namespace __asan { 30 31 uptr AsanMappingProfile[kAsanMappingProfileSize]; 32 33 static void AsanDie() { 34 static atomic_uint32_t num_calls; 35 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 36 // Don't die twice - run a busy loop. 37 while (1) { } 38 } 39 if (flags()->sleep_before_dying) { 40 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); 41 SleepForSeconds(flags()->sleep_before_dying); 42 } 43 if (flags()->unmap_shadow_on_exit) { 44 if (kMidMemBeg) { 45 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); 46 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); 47 } else { 48 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 49 } 50 } 51 if (death_callback) 52 death_callback(); 53 if (flags()->abort_on_error) 54 Abort(); 55 internal__exit(flags()->exitcode); 56 } 57 58 static void AsanCheckFailed(const char *file, int line, const char *cond, 59 u64 v1, u64 v2) { 60 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", 61 file, line, cond, (uptr)v1, (uptr)v2); 62 // FIXME: check for infinite recursion without a thread-local counter here. 63 PRINT_CURRENT_STACK(); 64 Die(); 65 } 66 67 // -------------------------- Flags ------------------------- {{{1 68 static const int kDefaultMallocContextSize = 30; 69 70 Flags asan_flags_dont_use_directly; // use via flags(). 71 72 static const char *MaybeCallAsanDefaultOptions() { 73 return (&__asan_default_options) ? __asan_default_options() : ""; 74 } 75 76 static const char *MaybeUseAsanDefaultOptionsCompileDefiniton() { 77 #ifdef ASAN_DEFAULT_OPTIONS 78 // Stringize the macro value. 79 # define ASAN_STRINGIZE(x) #x 80 # define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options) 81 return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS); 82 #else 83 return ""; 84 #endif 85 } 86 87 static void ParseFlagsFromString(Flags *f, const char *str) { 88 ParseCommonFlagsFromString(str); 89 CHECK((uptr)common_flags()->malloc_context_size <= kStackTraceMax); 90 91 ParseFlag(str, &f->quarantine_size, "quarantine_size"); 92 ParseFlag(str, &f->verbosity, "verbosity"); 93 ParseFlag(str, &f->redzone, "redzone"); 94 CHECK_GE(f->redzone, 16); 95 CHECK(IsPowerOfTwo(f->redzone)); 96 97 ParseFlag(str, &f->debug, "debug"); 98 ParseFlag(str, &f->report_globals, "report_globals"); 99 ParseFlag(str, &f->check_initialization_order, "check_initialization_order"); 100 101 ParseFlag(str, &f->replace_str, "replace_str"); 102 ParseFlag(str, &f->replace_intrin, "replace_intrin"); 103 ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free"); 104 ParseFlag(str, &f->use_fake_stack, "use_fake_stack"); 105 ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size"); 106 ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte"); 107 ParseFlag(str, &f->exitcode, "exitcode"); 108 ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning"); 109 ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying"); 110 ParseFlag(str, &f->handle_segv, "handle_segv"); 111 ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler"); 112 ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack"); 113 ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size"); 114 ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit"); 115 ParseFlag(str, &f->abort_on_error, "abort_on_error"); 116 ParseFlag(str, &f->print_stats, "print_stats"); 117 ParseFlag(str, &f->print_legend, "print_legend"); 118 ParseFlag(str, &f->atexit, "atexit"); 119 ParseFlag(str, &f->disable_core, "disable_core"); 120 ParseFlag(str, &f->allow_reexec, "allow_reexec"); 121 ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history"); 122 ParseFlag(str, &f->poison_heap, "poison_heap"); 123 ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch"); 124 ParseFlag(str, &f->use_stack_depot, "use_stack_depot"); 125 ParseFlag(str, &f->strict_memcmp, "strict_memcmp"); 126 ParseFlag(str, &f->strict_init_order, "strict_init_order"); 127 } 128 129 void InitializeFlags(Flags *f, const char *env) { 130 CommonFlags *cf = common_flags(); 131 cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH"); 132 cf->symbolize = true; 133 cf->malloc_context_size = kDefaultMallocContextSize; 134 cf->fast_unwind_on_fatal = false; 135 cf->fast_unwind_on_malloc = true; 136 cf->strip_path_prefix = ""; 137 cf->handle_ioctl = false; 138 cf->log_path = 0; 139 cf->detect_leaks = false; 140 cf->leak_check_at_exit = true; 141 142 internal_memset(f, 0, sizeof(*f)); 143 f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28; 144 f->verbosity = 0; 145 f->redzone = 16; 146 f->debug = false; 147 f->report_globals = 1; 148 f->check_initialization_order = false; 149 f->replace_str = true; 150 f->replace_intrin = true; 151 f->mac_ignore_invalid_free = false; 152 f->use_fake_stack = true; 153 f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K. 154 f->malloc_fill_byte = 0xbe; 155 f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 156 f->allow_user_poisoning = true; 157 f->sleep_before_dying = 0; 158 f->handle_segv = ASAN_NEEDS_SEGV; 159 f->allow_user_segv_handler = false; 160 f->use_sigaltstack = false; 161 f->check_malloc_usable_size = true; 162 f->unmap_shadow_on_exit = false; 163 f->abort_on_error = false; 164 f->print_stats = false; 165 f->print_legend = true; 166 f->atexit = false; 167 f->disable_core = (SANITIZER_WORDSIZE == 64); 168 f->allow_reexec = true; 169 f->print_full_thread_history = true; 170 f->poison_heap = true; 171 // Turn off alloc/dealloc mismatch checker on Mac for now. 172 // TODO(glider): Fix known issues and enable this back. 173 f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0);; 174 f->use_stack_depot = true; 175 f->strict_memcmp = true; 176 f->strict_init_order = false; 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 #if !CAN_SANITIZE_LEAKS 192 if (cf->detect_leaks) { 193 Report("%s: detect_leaks is not supported on this platform.\n", 194 SanitizerToolName); 195 cf->detect_leaks = false; 196 } 197 #endif 198 199 if (cf->detect_leaks && !f->use_stack_depot) { 200 Report("%s: detect_leaks is ignored (requires use_stack_depot).\n", 201 SanitizerToolName); 202 cf->detect_leaks = false; 203 } 204 } 205 206 // -------------------------- Globals --------------------- {{{1 207 int asan_inited; 208 bool asan_init_is_running; 209 void (*death_callback)(void); 210 211 #if !ASAN_FIXED_MAPPING 212 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; 213 #endif 214 215 // -------------------------- Misc ---------------- {{{1 216 void ShowStatsAndAbort() { 217 __asan_print_accumulated_stats(); 218 Die(); 219 } 220 221 // ---------------------- mmap -------------------- {{{1 222 // Reserve memory range [beg, end]. 223 static void ReserveShadowMemoryRange(uptr beg, uptr end) { 224 CHECK_EQ((beg % GetPageSizeCached()), 0); 225 CHECK_EQ(((end + 1) % GetPageSizeCached()), 0); 226 uptr size = end - beg + 1; 227 void *res = MmapFixedNoReserve(beg, size); 228 if (res != (void*)beg) { 229 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " 230 "Perhaps you're using ulimit -v\n", size); 231 Abort(); 232 } 233 } 234 235 // --------------- LowLevelAllocateCallbac ---------- {{{1 236 static void OnLowLevelAllocate(uptr ptr, uptr size) { 237 PoisonShadow(ptr, size, kAsanInternalHeapMagic); 238 } 239 240 // -------------------------- Run-time entry ------------------- {{{1 241 // exported functions 242 #define ASAN_REPORT_ERROR(type, is_write, size) \ 243 extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 244 void __asan_report_ ## type ## size(uptr addr); \ 245 void __asan_report_ ## type ## size(uptr addr) { \ 246 GET_CALLER_PC_BP_SP; \ 247 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 248 } 249 250 ASAN_REPORT_ERROR(load, false, 1) 251 ASAN_REPORT_ERROR(load, false, 2) 252 ASAN_REPORT_ERROR(load, false, 4) 253 ASAN_REPORT_ERROR(load, false, 8) 254 ASAN_REPORT_ERROR(load, false, 16) 255 ASAN_REPORT_ERROR(store, true, 1) 256 ASAN_REPORT_ERROR(store, true, 2) 257 ASAN_REPORT_ERROR(store, true, 4) 258 ASAN_REPORT_ERROR(store, true, 8) 259 ASAN_REPORT_ERROR(store, true, 16) 260 261 #define ASAN_REPORT_ERROR_N(type, is_write) \ 262 extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 263 void __asan_report_ ## type ## _n(uptr addr, uptr size); \ 264 void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ 265 GET_CALLER_PC_BP_SP; \ 266 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 267 } 268 269 ASAN_REPORT_ERROR_N(load, false) 270 ASAN_REPORT_ERROR_N(store, true) 271 272 // Force the linker to keep the symbols for various ASan interface functions. 273 // We want to keep those in the executable in order to let the instrumented 274 // dynamic libraries access the symbol even if it is not used by the executable 275 // itself. This should help if the build system is removing dead code at link 276 // time. 277 static NOINLINE void force_interface_symbols() { 278 volatile int fake_condition = 0; // prevent dead condition elimination. 279 // __asan_report_* functions are noreturn, so we need a switch to prevent 280 // the compiler from removing any of them. 281 switch (fake_condition) { 282 case 1: __asan_report_load1(0); break; 283 case 2: __asan_report_load2(0); break; 284 case 3: __asan_report_load4(0); break; 285 case 4: __asan_report_load8(0); break; 286 case 5: __asan_report_load16(0); break; 287 case 6: __asan_report_store1(0); break; 288 case 7: __asan_report_store2(0); break; 289 case 8: __asan_report_store4(0); break; 290 case 9: __asan_report_store8(0); break; 291 case 10: __asan_report_store16(0); break; 292 case 12: __asan_register_globals(0, 0); break; 293 case 13: __asan_unregister_globals(0, 0); break; 294 case 14: __asan_set_death_callback(0); break; 295 case 15: __asan_set_error_report_callback(0); break; 296 case 16: __asan_handle_no_return(); break; 297 case 17: __asan_address_is_poisoned(0); break; 298 case 18: __asan_get_allocated_size(0); break; 299 case 19: __asan_get_current_allocated_bytes(); break; 300 case 20: __asan_get_estimated_allocated_size(0); break; 301 case 21: __asan_get_free_bytes(); break; 302 case 22: __asan_get_heap_size(); break; 303 case 23: __asan_get_ownership(0); break; 304 case 24: __asan_get_unmapped_bytes(); break; 305 case 25: __asan_poison_memory_region(0, 0); break; 306 case 26: __asan_unpoison_memory_region(0, 0); break; 307 case 27: __asan_set_error_exit_code(0); break; 308 case 28: __asan_stack_free(0, 0, 0); break; 309 case 29: __asan_stack_malloc(0, 0); break; 310 case 30: __asan_before_dynamic_init(0); break; 311 case 31: __asan_after_dynamic_init(); break; 312 case 32: __asan_poison_stack_memory(0, 0); break; 313 case 33: __asan_unpoison_stack_memory(0, 0); break; 314 case 34: __asan_region_is_poisoned(0, 0); break; 315 case 35: __asan_describe_address(0); break; 316 } 317 } 318 319 static void asan_atexit() { 320 Printf("AddressSanitizer exit stats:\n"); 321 __asan_print_accumulated_stats(); 322 // Print AsanMappingProfile. 323 for (uptr i = 0; i < kAsanMappingProfileSize; i++) { 324 if (AsanMappingProfile[i] == 0) continue; 325 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); 326 } 327 } 328 329 static void InitializeHighMemEnd() { 330 #if !ASAN_FIXED_MAPPING 331 kHighMemEnd = GetMaxVirtualAddress(); 332 // Increase kHighMemEnd to make sure it's properly 333 // aligned together with kHighMemBeg: 334 kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1; 335 #endif // !ASAN_FIXED_MAPPING 336 CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0); 337 } 338 339 static void ProtectGap(uptr a, uptr size) { 340 CHECK_EQ(a, (uptr)Mprotect(a, size)); 341 } 342 343 static void PrintAddressSpaceLayout() { 344 Printf("|| `[%p, %p]` || HighMem ||\n", 345 (void*)kHighMemBeg, (void*)kHighMemEnd); 346 Printf("|| `[%p, %p]` || HighShadow ||\n", 347 (void*)kHighShadowBeg, (void*)kHighShadowEnd); 348 if (kMidMemBeg) { 349 Printf("|| `[%p, %p]` || ShadowGap3 ||\n", 350 (void*)kShadowGap3Beg, (void*)kShadowGap3End); 351 Printf("|| `[%p, %p]` || MidMem ||\n", 352 (void*)kMidMemBeg, (void*)kMidMemEnd); 353 Printf("|| `[%p, %p]` || ShadowGap2 ||\n", 354 (void*)kShadowGap2Beg, (void*)kShadowGap2End); 355 Printf("|| `[%p, %p]` || MidShadow ||\n", 356 (void*)kMidShadowBeg, (void*)kMidShadowEnd); 357 } 358 Printf("|| `[%p, %p]` || ShadowGap ||\n", 359 (void*)kShadowGapBeg, (void*)kShadowGapEnd); 360 if (kLowShadowBeg) { 361 Printf("|| `[%p, %p]` || LowShadow ||\n", 362 (void*)kLowShadowBeg, (void*)kLowShadowEnd); 363 Printf("|| `[%p, %p]` || LowMem ||\n", 364 (void*)kLowMemBeg, (void*)kLowMemEnd); 365 } 366 Printf("MemToShadow(shadow): %p %p %p %p", 367 (void*)MEM_TO_SHADOW(kLowShadowBeg), 368 (void*)MEM_TO_SHADOW(kLowShadowEnd), 369 (void*)MEM_TO_SHADOW(kHighShadowBeg), 370 (void*)MEM_TO_SHADOW(kHighShadowEnd)); 371 if (kMidMemBeg) { 372 Printf(" %p %p", 373 (void*)MEM_TO_SHADOW(kMidShadowBeg), 374 (void*)MEM_TO_SHADOW(kMidShadowEnd)); 375 } 376 Printf("\n"); 377 Printf("red_zone=%zu\n", (uptr)flags()->redzone); 378 Printf("malloc_context_size=%zu\n", 379 (uptr)common_flags()->malloc_context_size); 380 381 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 382 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 383 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 384 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 385 if (kMidMemBeg) 386 CHECK(kMidShadowBeg > kLowShadowEnd && 387 kMidMemBeg > kMidShadowEnd && 388 kHighShadowBeg > kMidMemEnd); 389 } 390 391 } // namespace __asan 392 393 // ---------------------- Interface ---------------- {{{1 394 using namespace __asan; // NOLINT 395 396 #if !SANITIZER_SUPPORTS_WEAK_HOOKS 397 extern "C" { 398 SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE 399 const char* __asan_default_options() { return ""; } 400 } // extern "C" 401 #endif 402 403 int NOINLINE __asan_set_error_exit_code(int exit_code) { 404 int old = flags()->exitcode; 405 flags()->exitcode = exit_code; 406 return old; 407 } 408 409 void NOINLINE __asan_handle_no_return() { 410 int local_stack; 411 AsanThread *curr_thread = GetCurrentThread(); 412 CHECK(curr_thread); 413 uptr PageSize = GetPageSizeCached(); 414 uptr top = curr_thread->stack_top(); 415 uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1); 416 static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M 417 if (top - bottom > kMaxExpectedCleanupSize) { 418 static bool reported_warning = false; 419 if (reported_warning) 420 return; 421 reported_warning = true; 422 Report("WARNING: ASan is ignoring requested __asan_handle_no_return: " 423 "stack top: %p; bottom %p; size: %p (%zd)\n" 424 "False positive error reports may follow\n" 425 "For details see " 426 "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n", 427 top, bottom, top - bottom, top - bottom); 428 return; 429 } 430 PoisonShadow(bottom, top - bottom, 0); 431 } 432 433 void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 434 death_callback = callback; 435 } 436 437 void __asan_init() { 438 if (asan_inited) return; 439 SanitizerToolName = "AddressSanitizer"; 440 CHECK(!asan_init_is_running && "ASan init calls itself!"); 441 asan_init_is_running = true; 442 InitializeHighMemEnd(); 443 444 // Make sure we are not statically linked. 445 AsanDoesNotSupportStaticLinkage(); 446 447 // Install tool-specific callbacks in sanitizer_common. 448 SetDieCallback(AsanDie); 449 SetCheckFailedCallback(AsanCheckFailed); 450 SetPrintfAndReportCallback(AppendToErrorMessageBuffer); 451 452 // Initialize flags. This must be done early, because most of the 453 // initialization steps look at flags(). 454 const char *options = GetEnv("ASAN_OPTIONS"); 455 InitializeFlags(flags(), options); 456 __sanitizer_set_report_path(common_flags()->log_path); 457 458 if (flags()->verbosity && options) { 459 Report("Parsed ASAN_OPTIONS: %s\n", options); 460 } 461 462 // Re-exec ourselves if we need to set additional env or command line args. 463 MaybeReexec(); 464 465 // Setup internal allocator callback. 466 SetLowLevelAllocateCallback(OnLowLevelAllocate); 467 468 if (flags()->atexit) { 469 Atexit(asan_atexit); 470 } 471 472 // interceptors 473 InitializeAsanInterceptors(); 474 475 ReplaceSystemMalloc(); 476 ReplaceOperatorsNewAndDelete(); 477 478 uptr shadow_start = kLowShadowBeg; 479 if (kLowShadowBeg) 480 shadow_start -= GetMmapGranularity(); 481 bool full_shadow_is_available = 482 MemoryRangeIsAvailable(shadow_start, kHighShadowEnd); 483 484 #if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING 485 if (!full_shadow_is_available) { 486 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; 487 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; 488 } 489 #endif 490 491 if (flags()->verbosity) 492 PrintAddressSpaceLayout(); 493 494 if (flags()->disable_core) { 495 DisableCoreDumper(); 496 } 497 498 if (full_shadow_is_available) { 499 // mmap the low shadow plus at least one page at the left. 500 if (kLowShadowBeg) 501 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 502 // mmap the high shadow. 503 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 504 // protect the gap. 505 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 506 } else if (kMidMemBeg && 507 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && 508 MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) { 509 CHECK(kLowShadowBeg != kLowShadowEnd); 510 // mmap the low shadow plus at least one page at the left. 511 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 512 // mmap the mid shadow. 513 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd); 514 // mmap the high shadow. 515 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 516 // protect the gaps. 517 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 518 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); 519 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); 520 } else { 521 Report("Shadow memory range interleaves with an existing memory mapping. " 522 "ASan cannot proceed correctly. ABORTING.\n"); 523 DumpProcessMap(); 524 Die(); 525 } 526 527 InstallSignalHandlers(); 528 529 AsanTSDInit(AsanThread::TSDDtor); 530 // Allocator should be initialized before starting external symbolizer, as 531 // fork() on Mac locks the allocator. 532 InitializeAllocator(); 533 534 // Start symbolizer process if necessary. 535 const char* external_symbolizer = common_flags()->external_symbolizer_path; 536 if (common_flags()->symbolize && external_symbolizer && 537 external_symbolizer[0]) { 538 InitializeExternalSymbolizer(external_symbolizer); 539 } 540 541 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 542 // should be set to 1 prior to initializing the threads. 543 asan_inited = 1; 544 asan_init_is_running = false; 545 546 InitTlsSize(); 547 548 // Create main thread. 549 AsanThread *main_thread = AsanThread::Create(0, 0); 550 CreateThreadContextArgs create_main_args = { main_thread, 0 }; 551 u32 main_tid = asanThreadRegistry().CreateThread( 552 0, true, 0, &create_main_args); 553 CHECK_EQ(0, main_tid); 554 SetCurrentThread(main_thread); 555 main_thread->ThreadStart(internal_getpid()); 556 force_interface_symbols(); // no-op. 557 558 #if CAN_SANITIZE_LEAKS 559 __lsan::InitCommonLsan(); 560 if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) { 561 Atexit(__lsan::DoLeakCheck); 562 } 563 #endif // CAN_SANITIZE_LEAKS 564 565 if (flags()->verbosity) { 566 Report("AddressSanitizer Init done\n"); 567 } 568 } 569
