asan_rtl.cc revision 13521a267f509a06e92baa154947b9d2cde0eed8
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_interface_internal.h" 17#include "asan_internal.h" 18#include "asan_mapping.h" 19#include "asan_poisoning.h" 20#include "asan_report.h" 21#include "asan_stack.h" 22#include "asan_stats.h" 23#include "asan_thread.h" 24#include "sanitizer_common/sanitizer_atomic.h" 25#include "sanitizer_common/sanitizer_flags.h" 26#include "sanitizer_common/sanitizer_libc.h" 27#include "sanitizer_common/sanitizer_symbolizer.h" 28#include "lsan/lsan_common.h" 29 30int __asan_option_detect_stack_use_after_return; // Global interface symbol. 31 32namespace __asan { 33 34uptr AsanMappingProfile[kAsanMappingProfileSize]; 35 36static void AsanDie() { 37 static atomic_uint32_t num_calls; 38 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 39 // Don't die twice - run a busy loop. 40 while (1) { } 41 } 42 if (flags()->sleep_before_dying) { 43 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); 44 SleepForSeconds(flags()->sleep_before_dying); 45 } 46 if (flags()->unmap_shadow_on_exit) { 47 if (kMidMemBeg) { 48 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); 49 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); 50 } else { 51 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 52 } 53 } 54 if (death_callback) 55 death_callback(); 56 if (flags()->abort_on_error) 57 Abort(); 58 internal__exit(flags()->exitcode); 59} 60 61static void AsanCheckFailed(const char *file, int line, const char *cond, 62 u64 v1, u64 v2) { 63 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", 64 file, line, cond, (uptr)v1, (uptr)v2); 65 // FIXME: check for infinite recursion without a thread-local counter here. 66 PRINT_CURRENT_STACK(); 67 Die(); 68} 69 70// -------------------------- Flags ------------------------- {{{1 71static const int kDefaultMallocContextSize = 30; 72 73Flags asan_flags_dont_use_directly; // use via flags(). 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 ParseCommonFlagsFromString(str); 92 CHECK((uptr)common_flags()->malloc_context_size <= kStackTraceMax); 93 94 ParseFlag(str, &f->quarantine_size, "quarantine_size"); 95 ParseFlag(str, &f->redzone, "redzone"); 96 CHECK_GE(f->redzone, 16); 97 CHECK(IsPowerOfTwo(f->redzone)); 98 99 ParseFlag(str, &f->debug, "debug"); 100 ParseFlag(str, &f->report_globals, "report_globals"); 101 ParseFlag(str, &f->check_initialization_order, "check_initialization_order"); 102 103 ParseFlag(str, &f->replace_str, "replace_str"); 104 ParseFlag(str, &f->replace_intrin, "replace_intrin"); 105 ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free"); 106 ParseFlag(str, &f->detect_stack_use_after_return, 107 "detect_stack_use_after_return"); 108 ParseFlag(str, &f->uar_stack_size_log, "uar_stack_size_log"); 109 ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size"); 110 ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte"); 111 ParseFlag(str, &f->exitcode, "exitcode"); 112 ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning"); 113 ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying"); 114 ParseFlag(str, &f->handle_segv, "handle_segv"); 115 ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler"); 116 ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack"); 117 ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size"); 118 ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit"); 119 ParseFlag(str, &f->abort_on_error, "abort_on_error"); 120 ParseFlag(str, &f->print_stats, "print_stats"); 121 ParseFlag(str, &f->print_legend, "print_legend"); 122 ParseFlag(str, &f->atexit, "atexit"); 123 ParseFlag(str, &f->disable_core, "disable_core"); 124 ParseFlag(str, &f->allow_reexec, "allow_reexec"); 125 ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history"); 126 ParseFlag(str, &f->poison_heap, "poison_heap"); 127 ParseFlag(str, &f->poison_partial, "poison_partial"); 128 ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch"); 129 ParseFlag(str, &f->use_stack_depot, "use_stack_depot"); 130 ParseFlag(str, &f->strict_memcmp, "strict_memcmp"); 131 ParseFlag(str, &f->strict_init_order, "strict_init_order"); 132} 133 134void InitializeFlags(Flags *f, const char *env) { 135 CommonFlags *cf = common_flags(); 136 cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH"); 137 cf->symbolize = true; 138 cf->malloc_context_size = kDefaultMallocContextSize; 139 cf->fast_unwind_on_fatal = false; 140 cf->fast_unwind_on_malloc = true; 141 cf->strip_path_prefix = ""; 142 cf->handle_ioctl = false; 143 cf->log_path = 0; 144 cf->detect_leaks = false; 145 cf->leak_check_at_exit = true; 146 147 internal_memset(f, 0, sizeof(*f)); 148 f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28; 149 f->redzone = 16; 150 f->debug = false; 151 f->report_globals = 1; 152 f->check_initialization_order = false; 153 f->replace_str = true; 154 f->replace_intrin = true; 155 f->mac_ignore_invalid_free = false; 156 f->detect_stack_use_after_return = false; // Also needs the compiler flag. 157 f->uar_stack_size_log = 0; 158 f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K. 159 f->malloc_fill_byte = 0xbe; 160 f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 161 f->allow_user_poisoning = true; 162 f->sleep_before_dying = 0; 163 f->handle_segv = ASAN_NEEDS_SEGV; 164 f->allow_user_segv_handler = false; 165 f->use_sigaltstack = false; 166 f->check_malloc_usable_size = true; 167 f->unmap_shadow_on_exit = false; 168 f->abort_on_error = false; 169 f->print_stats = false; 170 f->print_legend = true; 171 f->atexit = false; 172 f->disable_core = (SANITIZER_WORDSIZE == 64); 173 f->allow_reexec = true; 174 f->print_full_thread_history = true; 175 f->poison_heap = true; 176 f->poison_partial = true; 177 // Turn off alloc/dealloc mismatch checker on Mac and Windows for now. 178 // TODO(glider,timurrrr): Fix known issues and enable this back. 179 f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0); 180 f->use_stack_depot = true; 181 f->strict_memcmp = true; 182 f->strict_init_order = false; 183 184 // Override from compile definition. 185 ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton()); 186 187 // Override from user-specified string. 188 ParseFlagsFromString(f, MaybeCallAsanDefaultOptions()); 189 if (common_flags()->verbosity) { 190 Report("Using the defaults from __asan_default_options: %s\n", 191 MaybeCallAsanDefaultOptions()); 192 } 193 194 // Override from command line. 195 ParseFlagsFromString(f, env); 196 197#if !CAN_SANITIZE_LEAKS 198 if (cf->detect_leaks) { 199 Report("%s: detect_leaks is not supported on this platform.\n", 200 SanitizerToolName); 201 cf->detect_leaks = false; 202 } 203#endif 204 205 if (cf->detect_leaks && !f->use_stack_depot) { 206 Report("%s: detect_leaks is ignored (requires use_stack_depot).\n", 207 SanitizerToolName); 208 cf->detect_leaks = false; 209 } 210} 211 212// -------------------------- Globals --------------------- {{{1 213int asan_inited; 214bool asan_init_is_running; 215void (*death_callback)(void); 216 217#if !ASAN_FIXED_MAPPING 218uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; 219#endif 220 221// -------------------------- Misc ---------------- {{{1 222void ShowStatsAndAbort() { 223 __asan_print_accumulated_stats(); 224 Die(); 225} 226 227// ---------------------- mmap -------------------- {{{1 228// Reserve memory range [beg, end]. 229static void ReserveShadowMemoryRange(uptr beg, uptr end) { 230 CHECK_EQ((beg % GetPageSizeCached()), 0); 231 CHECK_EQ(((end + 1) % GetPageSizeCached()), 0); 232 uptr size = end - beg + 1; 233 void *res = MmapFixedNoReserve(beg, size); 234 if (res != (void*)beg) { 235 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " 236 "Perhaps you're using ulimit -v\n", size); 237 Abort(); 238 } 239} 240 241// --------------- LowLevelAllocateCallbac ---------- {{{1 242static void OnLowLevelAllocate(uptr ptr, uptr size) { 243 PoisonShadow(ptr, size, kAsanInternalHeapMagic); 244} 245 246// -------------------------- Run-time entry ------------------- {{{1 247// exported functions 248#define ASAN_REPORT_ERROR(type, is_write, size) \ 249extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 250void __asan_report_ ## type ## size(uptr addr); \ 251void __asan_report_ ## type ## size(uptr addr) { \ 252 GET_CALLER_PC_BP_SP; \ 253 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 254} 255 256ASAN_REPORT_ERROR(load, false, 1) 257ASAN_REPORT_ERROR(load, false, 2) 258ASAN_REPORT_ERROR(load, false, 4) 259ASAN_REPORT_ERROR(load, false, 8) 260ASAN_REPORT_ERROR(load, false, 16) 261ASAN_REPORT_ERROR(store, true, 1) 262ASAN_REPORT_ERROR(store, true, 2) 263ASAN_REPORT_ERROR(store, true, 4) 264ASAN_REPORT_ERROR(store, true, 8) 265ASAN_REPORT_ERROR(store, true, 16) 266 267#define ASAN_REPORT_ERROR_N(type, is_write) \ 268extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 269void __asan_report_ ## type ## _n(uptr addr, uptr size); \ 270void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ 271 GET_CALLER_PC_BP_SP; \ 272 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 273} 274 275ASAN_REPORT_ERROR_N(load, false) 276ASAN_REPORT_ERROR_N(store, true) 277 278// Force the linker to keep the symbols for various ASan interface functions. 279// We want to keep those in the executable in order to let the instrumented 280// dynamic libraries access the symbol even if it is not used by the executable 281// itself. This should help if the build system is removing dead code at link 282// time. 283static NOINLINE void force_interface_symbols() { 284 volatile int fake_condition = 0; // prevent dead condition elimination. 285 // __asan_report_* functions are noreturn, so we need a switch to prevent 286 // the compiler from removing any of them. 287 switch (fake_condition) { 288 case 1: __asan_report_load1(0); break; 289 case 2: __asan_report_load2(0); break; 290 case 3: __asan_report_load4(0); break; 291 case 4: __asan_report_load8(0); break; 292 case 5: __asan_report_load16(0); break; 293 case 6: __asan_report_store1(0); break; 294 case 7: __asan_report_store2(0); break; 295 case 8: __asan_report_store4(0); break; 296 case 9: __asan_report_store8(0); break; 297 case 10: __asan_report_store16(0); break; 298 case 12: __asan_register_globals(0, 0); break; 299 case 13: __asan_unregister_globals(0, 0); break; 300 case 14: __asan_set_death_callback(0); break; 301 case 15: __asan_set_error_report_callback(0); break; 302 case 16: __asan_handle_no_return(); break; 303 case 17: __asan_address_is_poisoned(0); break; 304 case 18: __asan_get_allocated_size(0); break; 305 case 19: __asan_get_current_allocated_bytes(); break; 306 case 20: __asan_get_estimated_allocated_size(0); break; 307 case 21: __asan_get_free_bytes(); break; 308 case 22: __asan_get_heap_size(); break; 309 case 23: __asan_get_ownership(0); break; 310 case 24: __asan_get_unmapped_bytes(); break; 311 case 25: __asan_poison_memory_region(0, 0); break; 312 case 26: __asan_unpoison_memory_region(0, 0); break; 313 case 27: __asan_set_error_exit_code(0); break; 314 case 30: __asan_before_dynamic_init(0); break; 315 case 31: __asan_after_dynamic_init(); break; 316 case 32: __asan_poison_stack_memory(0, 0); break; 317 case 33: __asan_unpoison_stack_memory(0, 0); break; 318 case 34: __asan_region_is_poisoned(0, 0); break; 319 case 35: __asan_describe_address(0); break; 320 } 321} 322 323static void asan_atexit() { 324 Printf("AddressSanitizer exit stats:\n"); 325 __asan_print_accumulated_stats(); 326 // Print AsanMappingProfile. 327 for (uptr i = 0; i < kAsanMappingProfileSize; i++) { 328 if (AsanMappingProfile[i] == 0) continue; 329 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); 330 } 331} 332 333static void InitializeHighMemEnd() { 334#if !ASAN_FIXED_MAPPING 335 kHighMemEnd = GetMaxVirtualAddress(); 336 // Increase kHighMemEnd to make sure it's properly 337 // aligned together with kHighMemBeg: 338 kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1; 339#endif // !ASAN_FIXED_MAPPING 340 CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0); 341} 342 343static void ProtectGap(uptr a, uptr size) { 344 CHECK_EQ(a, (uptr)Mprotect(a, size)); 345} 346 347static void PrintAddressSpaceLayout() { 348 Printf("|| `[%p, %p]` || HighMem ||\n", 349 (void*)kHighMemBeg, (void*)kHighMemEnd); 350 Printf("|| `[%p, %p]` || HighShadow ||\n", 351 (void*)kHighShadowBeg, (void*)kHighShadowEnd); 352 if (kMidMemBeg) { 353 Printf("|| `[%p, %p]` || ShadowGap3 ||\n", 354 (void*)kShadowGap3Beg, (void*)kShadowGap3End); 355 Printf("|| `[%p, %p]` || MidMem ||\n", 356 (void*)kMidMemBeg, (void*)kMidMemEnd); 357 Printf("|| `[%p, %p]` || ShadowGap2 ||\n", 358 (void*)kShadowGap2Beg, (void*)kShadowGap2End); 359 Printf("|| `[%p, %p]` || MidShadow ||\n", 360 (void*)kMidShadowBeg, (void*)kMidShadowEnd); 361 } 362 Printf("|| `[%p, %p]` || ShadowGap ||\n", 363 (void*)kShadowGapBeg, (void*)kShadowGapEnd); 364 if (kLowShadowBeg) { 365 Printf("|| `[%p, %p]` || LowShadow ||\n", 366 (void*)kLowShadowBeg, (void*)kLowShadowEnd); 367 Printf("|| `[%p, %p]` || LowMem ||\n", 368 (void*)kLowMemBeg, (void*)kLowMemEnd); 369 } 370 Printf("MemToShadow(shadow): %p %p %p %p", 371 (void*)MEM_TO_SHADOW(kLowShadowBeg), 372 (void*)MEM_TO_SHADOW(kLowShadowEnd), 373 (void*)MEM_TO_SHADOW(kHighShadowBeg), 374 (void*)MEM_TO_SHADOW(kHighShadowEnd)); 375 if (kMidMemBeg) { 376 Printf(" %p %p", 377 (void*)MEM_TO_SHADOW(kMidShadowBeg), 378 (void*)MEM_TO_SHADOW(kMidShadowEnd)); 379 } 380 Printf("\n"); 381 Printf("red_zone=%zu\n", (uptr)flags()->redzone); 382 Printf("quarantine_size=%zuM\n", (uptr)flags()->quarantine_size >> 20); 383 Printf("malloc_context_size=%zu\n", 384 (uptr)common_flags()->malloc_context_size); 385 386 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 387 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 388 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 389 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 390 if (kMidMemBeg) 391 CHECK(kMidShadowBeg > kLowShadowEnd && 392 kMidMemBeg > kMidShadowEnd && 393 kHighShadowBeg > kMidMemEnd); 394} 395 396} // namespace __asan 397 398// ---------------------- Interface ---------------- {{{1 399using namespace __asan; // NOLINT 400 401#if !SANITIZER_SUPPORTS_WEAK_HOOKS 402extern "C" { 403SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE 404const char* __asan_default_options() { return ""; } 405} // extern "C" 406#endif 407 408int NOINLINE __asan_set_error_exit_code(int exit_code) { 409 int old = flags()->exitcode; 410 flags()->exitcode = exit_code; 411 return old; 412} 413 414void NOINLINE __asan_handle_no_return() { 415 int local_stack; 416 AsanThread *curr_thread = GetCurrentThread(); 417 CHECK(curr_thread); 418 uptr PageSize = GetPageSizeCached(); 419 uptr top = curr_thread->stack_top(); 420 uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1); 421 static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M 422 if (top - bottom > kMaxExpectedCleanupSize) { 423 static bool reported_warning = false; 424 if (reported_warning) 425 return; 426 reported_warning = true; 427 Report("WARNING: ASan is ignoring requested __asan_handle_no_return: " 428 "stack top: %p; bottom %p; size: %p (%zd)\n" 429 "False positive error reports may follow\n" 430 "For details see " 431 "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n", 432 top, bottom, top - bottom, top - bottom); 433 return; 434 } 435 PoisonShadow(bottom, top - bottom, 0); 436 if (curr_thread->has_fake_stack()) 437 curr_thread->fake_stack()->HandleNoReturn(); 438} 439 440void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 441 death_callback = callback; 442} 443 444void __asan_init() { 445 if (asan_inited) return; 446 SanitizerToolName = "AddressSanitizer"; 447 CHECK(!asan_init_is_running && "ASan init calls itself!"); 448 asan_init_is_running = true; 449 InitializeHighMemEnd(); 450 451 // Make sure we are not statically linked. 452 AsanDoesNotSupportStaticLinkage(); 453 454 // Install tool-specific callbacks in sanitizer_common. 455 SetDieCallback(AsanDie); 456 SetCheckFailedCallback(AsanCheckFailed); 457 SetPrintfAndReportCallback(AppendToErrorMessageBuffer); 458 459 // Initialize flags. This must be done early, because most of the 460 // initialization steps look at flags(). 461 const char *options = GetEnv("ASAN_OPTIONS"); 462 InitializeFlags(flags(), options); 463 __sanitizer_set_report_path(common_flags()->log_path); 464 __asan_option_detect_stack_use_after_return = 465 flags()->detect_stack_use_after_return; 466 467 if (common_flags()->verbosity && options) { 468 Report("Parsed ASAN_OPTIONS: %s\n", options); 469 } 470 471 // Re-exec ourselves if we need to set additional env or command line args. 472 MaybeReexec(); 473 474 // Setup internal allocator callback. 475 SetLowLevelAllocateCallback(OnLowLevelAllocate); 476 477 if (flags()->atexit) { 478 Atexit(asan_atexit); 479 } 480 481 // interceptors 482 InitializeAsanInterceptors(); 483 484 ReplaceSystemMalloc(); 485 ReplaceOperatorsNewAndDelete(); 486 487 uptr shadow_start = kLowShadowBeg; 488 if (kLowShadowBeg) 489 shadow_start -= GetMmapGranularity(); 490 bool full_shadow_is_available = 491 MemoryRangeIsAvailable(shadow_start, kHighShadowEnd); 492 493#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING 494 if (!full_shadow_is_available) { 495 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; 496 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; 497 } 498#endif 499 500 if (common_flags()->verbosity) 501 PrintAddressSpaceLayout(); 502 503 if (flags()->disable_core) { 504 DisableCoreDumper(); 505 } 506 507 if (full_shadow_is_available) { 508 // mmap the low shadow plus at least one page at the left. 509 if (kLowShadowBeg) 510 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 511 // mmap the high shadow. 512 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 513 // protect the gap. 514 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 515 } else if (kMidMemBeg && 516 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && 517 MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) { 518 CHECK(kLowShadowBeg != kLowShadowEnd); 519 // mmap the low shadow plus at least one page at the left. 520 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 521 // mmap the mid shadow. 522 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd); 523 // mmap the high shadow. 524 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 525 // protect the gaps. 526 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 527 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); 528 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); 529 } else { 530 Report("Shadow memory range interleaves with an existing memory mapping. " 531 "ASan cannot proceed correctly. ABORTING.\n"); 532 DumpProcessMap(); 533 Die(); 534 } 535 536 AsanTSDInit(PlatformTSDDtor); 537 InstallSignalHandlers(); 538 539 // Allocator should be initialized before starting external symbolizer, as 540 // fork() on Mac locks the allocator. 541 InitializeAllocator(); 542 543 // Start symbolizer process if necessary. 544 if (common_flags()->symbolize && &getSymbolizer) { 545 getSymbolizer() 546 ->InitializeExternal(common_flags()->external_symbolizer_path); 547 } 548 549 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 550 // should be set to 1 prior to initializing the threads. 551 asan_inited = 1; 552 asan_init_is_running = false; 553 554 InitTlsSize(); 555 556 // Create main thread. 557 AsanThread *main_thread = AsanThread::Create(0, 0); 558 CreateThreadContextArgs create_main_args = { main_thread, 0 }; 559 u32 main_tid = asanThreadRegistry().CreateThread( 560 0, true, 0, &create_main_args); 561 CHECK_EQ(0, main_tid); 562 SetCurrentThread(main_thread); 563 main_thread->ThreadStart(internal_getpid()); 564 force_interface_symbols(); // no-op. 565 566#if CAN_SANITIZE_LEAKS 567 __lsan::InitCommonLsan(); 568 if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) { 569 Atexit(__lsan::DoLeakCheck); 570 } 571#endif // CAN_SANITIZE_LEAKS 572 573 if (common_flags()->verbosity) { 574 Report("AddressSanitizer Init done\n"); 575 } 576} 577