libsanitizer/asan/asan_rtl.cc

   1 //===-- asan_rtl.cc -------------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of AddressSanitizer, an address sanity checker.
   9 //
  10 // Main file of the ASan run-time library.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "asan_activation.h"
  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_suppressions.h"
  24 #include "asan_thread.h"
  25 #include "sanitizer_common/sanitizer_atomic.h"
  26 #include "sanitizer_common/sanitizer_flags.h"
  27 #include "sanitizer_common/sanitizer_libc.h"
  28 #include "sanitizer_common/sanitizer_symbolizer.h"
  29 #include "lsan/lsan_common.h"
  30 #include "ubsan/ubsan_init.h"
  31 #include "ubsan/ubsan_platform.h"
  32
  33 uptr __asan_shadow_memory_dynamic_address;  // Global interface symbol.
  34 int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
  35 uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
  36
  37 namespace __asan {
  38
  39 uptr AsanMappingProfile[kAsanMappingProfileSize];
  40
  41 static void AsanDie() {
  42   static atomic_uint32_t num_calls;
  43   if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
  44     // Don't die twice - run a busy loop.
  45     while (1) { }
  46   }
  47   if (common_flags()->print_module_map >= 1) PrintModuleMap();
  48   if (flags()->sleep_before_dying) {
  49     Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
  50     SleepForSeconds(flags()->sleep_before_dying);
  51   }
  52   if (flags()->unmap_shadow_on_exit) {
  53     if (kMidMemBeg) {
  54       UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
  55       UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
  56     } else {
  57       if (kHighShadowEnd)
  58         UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
  59     }
  60   }
  61 }
  62
  63 static void AsanCheckFailed(const char *file, int line, const char *cond,
  64                             u64 v1, u64 v2) {
  65   Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
  66          line, cond, (uptr)v1, (uptr)v2);
  67
  68   // Print a stack trace the first time we come here. Otherwise, we probably
  69   // failed a CHECK during symbolization.
  70   static atomic_uint32_t num_calls;
  71   if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) == 0) {
  72     PRINT_CURRENT_STACK_CHECK();
  73   }
  74
  75   Die();
  76 }
  77
  78 // -------------------------- Globals --------------------- {{{1
  79 int asan_inited;
  80 bool asan_init_is_running;
  81
  82 #if !ASAN_FIXED_MAPPING
  83 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
  84 #endif
  85
  86 // -------------------------- Misc ---------------- {{{1
  87 void ShowStatsAndAbort() {
  88   __asan_print_accumulated_stats();
  89   Die();
  90 }
  91
  92 // --------------- LowLevelAllocateCallbac ---------- {{{1
  93 static void OnLowLevelAllocate(uptr ptr, uptr size) {
  94   PoisonShadow(ptr, size, kAsanInternalHeapMagic);
  95 }
  96
  97 // -------------------------- Run-time entry ------------------- {{{1
  98 // exported functions
  99 #define ASAN_REPORT_ERROR(type, is_write, size)                     \
 100 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 101 void __asan_report_ ## type ## size(uptr addr) {                    \
 102   GET_CALLER_PC_BP_SP;                                              \
 103   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);    \
 104 }                                                                   \
 105 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 106 void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
 107   GET_CALLER_PC_BP_SP;                                              \
 108   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);  \
 109 }                                                                   \
 110 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 111 void __asan_report_ ## type ## size ## _noabort(uptr addr) {        \
 112   GET_CALLER_PC_BP_SP;                                              \
 113   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);   \
 114 }                                                                   \
 115
 116 ASAN_REPORT_ERROR(load, false, 1)
 117 ASAN_REPORT_ERROR(load, false, 2)
 118 ASAN_REPORT_ERROR(load, false, 4)
 119 ASAN_REPORT_ERROR(load, false, 8)
 120 ASAN_REPORT_ERROR(load, false, 16)
 121 ASAN_REPORT_ERROR(store, true, 1)
 122 ASAN_REPORT_ERROR(store, true, 2)
 123 ASAN_REPORT_ERROR(store, true, 4)
 124 ASAN_REPORT_ERROR(store, true, 8)
 125 ASAN_REPORT_ERROR(store, true, 16)
 126
 127 #define ASAN_REPORT_ERROR_N(type, is_write)                                 \
 128 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 129 void __asan_report_ ## type ## _n(uptr addr, uptr size) {                   \
 130   GET_CALLER_PC_BP_SP;                                                      \
 131   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);            \
 132 }                                                                           \
 133 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 134 void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
 135   GET_CALLER_PC_BP_SP;                                                      \
 136   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);          \
 137 }                                                                           \
 138 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 139 void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) {           \
 140   GET_CALLER_PC_BP_SP;                                                      \
 141   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);           \
 142 }                                                                           \
 143
 144 ASAN_REPORT_ERROR_N(load, false)
 145 ASAN_REPORT_ERROR_N(store, true)
 146
 147 #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
 148     if (SANITIZER_MYRIAD2 && !AddrIsInMem(addr) && !AddrIsInShadow(addr))      \
 149       return;                                                                  \
 150     uptr sp = MEM_TO_SHADOW(addr);                                             \
 151     uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp)          \
 152                                         : *reinterpret_cast<u16 *>(sp);        \
 153     if (UNLIKELY(s)) {                                                         \
 154       if (UNLIKELY(size >= SHADOW_GRANULARITY ||                               \
 155                    ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >=     \
 156                        (s8)s)) {                                               \
 157         if (__asan_test_only_reported_buggy_pointer) {                         \
 158           *__asan_test_only_reported_buggy_pointer = addr;                     \
 159         } else {                                                               \
 160           GET_CALLER_PC_BP_SP;                                                 \
 161           ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg,        \
 162                               fatal);                                          \
 163         }                                                                      \
 164       }                                                                        \
 165     }
 166
 167 #define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size)                      \
 168   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 169   void __asan_##type##size(uptr addr) {                                        \
 170     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true)            \
 171   }                                                                            \
 172   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 173   void __asan_exp_##type##size(uptr addr, u32 exp) {                           \
 174     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true)          \
 175   }                                                                            \
 176   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 177   void __asan_##type##size ## _noabort(uptr addr) {                            \
 178     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false)           \
 179   }                                                                            \
 180
 181 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
 182 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
 183 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
 184 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
 185 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
 186 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
 187 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
 188 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
 189 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
 190 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
 191
 192 extern "C"
 193 NOINLINE INTERFACE_ATTRIBUTE
 194 void __asan_loadN(uptr addr, uptr size) {
 195   if (__asan_region_is_poisoned(addr, size)) {
 196     GET_CALLER_PC_BP_SP;
 197     ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
 198   }
 199 }
 200
 201 extern "C"
 202 NOINLINE INTERFACE_ATTRIBUTE
 203 void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
 204   if (__asan_region_is_poisoned(addr, size)) {
 205     GET_CALLER_PC_BP_SP;
 206     ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
 207   }
 208 }
 209
 210 extern "C"
 211 NOINLINE INTERFACE_ATTRIBUTE
 212 void __asan_loadN_noabort(uptr addr, uptr size) {
 213   if (__asan_region_is_poisoned(addr, size)) {
 214     GET_CALLER_PC_BP_SP;
 215     ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
 216   }
 217 }
 218
 219 extern "C"
 220 NOINLINE INTERFACE_ATTRIBUTE
 221 void __asan_storeN(uptr addr, uptr size) {
 222   if (__asan_region_is_poisoned(addr, size)) {
 223     GET_CALLER_PC_BP_SP;
 224     ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
 225   }
 226 }
 227
 228 extern "C"
 229 NOINLINE INTERFACE_ATTRIBUTE
 230 void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
 231   if (__asan_region_is_poisoned(addr, size)) {
 232     GET_CALLER_PC_BP_SP;
 233     ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
 234   }
 235 }
 236
 237 extern "C"
 238 NOINLINE INTERFACE_ATTRIBUTE
 239 void __asan_storeN_noabort(uptr addr, uptr size) {
 240   if (__asan_region_is_poisoned(addr, size)) {
 241     GET_CALLER_PC_BP_SP;
 242     ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
 243   }
 244 }
 245
 246 // Force the linker to keep the symbols for various ASan interface functions.
 247 // We want to keep those in the executable in order to let the instrumented
 248 // dynamic libraries access the symbol even if it is not used by the executable
 249 // itself. This should help if the build system is removing dead code at link
 250 // time.
 251 static NOINLINE void force_interface_symbols() {
 252   volatile int fake_condition = 0;  // prevent dead condition elimination.
 253   // __asan_report_* functions are noreturn, so we need a switch to prevent
 254   // the compiler from removing any of them.
 255   // clang-format off
 256   switch (fake_condition) {
 257     case 1: __asan_report_load1(0); break;
 258     case 2: __asan_report_load2(0); break;
 259     case 3: __asan_report_load4(0); break;
 260     case 4: __asan_report_load8(0); break;
 261     case 5: __asan_report_load16(0); break;
 262     case 6: __asan_report_load_n(0, 0); break;
 263     case 7: __asan_report_store1(0); break;
 264     case 8: __asan_report_store2(0); break;
 265     case 9: __asan_report_store4(0); break;
 266     case 10: __asan_report_store8(0); break;
 267     case 11: __asan_report_store16(0); break;
 268     case 12: __asan_report_store_n(0, 0); break;
 269     case 13: __asan_report_exp_load1(0, 0); break;
 270     case 14: __asan_report_exp_load2(0, 0); break;
 271     case 15: __asan_report_exp_load4(0, 0); break;
 272     case 16: __asan_report_exp_load8(0, 0); break;
 273     case 17: __asan_report_exp_load16(0, 0); break;
 274     case 18: __asan_report_exp_load_n(0, 0, 0); break;
 275     case 19: __asan_report_exp_store1(0, 0); break;
 276     case 20: __asan_report_exp_store2(0, 0); break;
 277     case 21: __asan_report_exp_store4(0, 0); break;
 278     case 22: __asan_report_exp_store8(0, 0); break;
 279     case 23: __asan_report_exp_store16(0, 0); break;
 280     case 24: __asan_report_exp_store_n(0, 0, 0); break;
 281     case 25: __asan_register_globals(nullptr, 0); break;
 282     case 26: __asan_unregister_globals(nullptr, 0); break;
 283     case 27: __asan_set_death_callback(nullptr); break;
 284     case 28: __asan_set_error_report_callback(nullptr); break;
 285     case 29: __asan_handle_no_return(); break;
 286     case 30: __asan_address_is_poisoned(nullptr); break;
 287     case 31: __asan_poison_memory_region(nullptr, 0); break;
 288     case 32: __asan_unpoison_memory_region(nullptr, 0); break;
 289     case 34: __asan_before_dynamic_init(nullptr); break;
 290     case 35: __asan_after_dynamic_init(); break;
 291     case 36: __asan_poison_stack_memory(0, 0); break;
 292     case 37: __asan_unpoison_stack_memory(0, 0); break;
 293     case 38: __asan_region_is_poisoned(0, 0); break;
 294     case 39: __asan_describe_address(0); break;
 295     case 40: __asan_set_shadow_00(0, 0); break;
 296     case 41: __asan_set_shadow_f1(0, 0); break;
 297     case 42: __asan_set_shadow_f2(0, 0); break;
 298     case 43: __asan_set_shadow_f3(0, 0); break;
 299     case 44: __asan_set_shadow_f5(0, 0); break;
 300     case 45: __asan_set_shadow_f8(0, 0); break;
 301   }
 302   // clang-format on
 303 }
 304
 305 static 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
 315 static void InitializeHighMemEnd() {
 316 #if !SANITIZER_MYRIAD2
 317 #if !ASAN_FIXED_MAPPING
 318   kHighMemEnd = GetMaxUserVirtualAddress();
 319   // Increase kHighMemEnd to make sure it's properly
 320   // aligned together with kHighMemBeg:
 321   kHighMemEnd |= SHADOW_GRANULARITY * GetMmapGranularity() - 1;
 322 #endif  // !ASAN_FIXED_MAPPING
 323   CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
 324 #endif  // !SANITIZER_MYRIAD2
 325 }
 326
 327 void PrintAddressSpaceLayout() {
 328   if (kHighMemBeg) {
 329     Printf("|| `[%p, %p]` || HighMem    ||\n",
 330            (void*)kHighMemBeg, (void*)kHighMemEnd);
 331     Printf("|| `[%p, %p]` || HighShadow ||\n",
 332            (void*)kHighShadowBeg, (void*)kHighShadowEnd);
 333   }
 334   if (kMidMemBeg) {
 335     Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
 336            (void*)kShadowGap3Beg, (void*)kShadowGap3End);
 337     Printf("|| `[%p, %p]` || MidMem     ||\n",
 338            (void*)kMidMemBeg, (void*)kMidMemEnd);
 339     Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
 340            (void*)kShadowGap2Beg, (void*)kShadowGap2End);
 341     Printf("|| `[%p, %p]` || MidShadow  ||\n",
 342            (void*)kMidShadowBeg, (void*)kMidShadowEnd);
 343   }
 344   Printf("|| `[%p, %p]` || ShadowGap  ||\n",
 345          (void*)kShadowGapBeg, (void*)kShadowGapEnd);
 346   if (kLowShadowBeg) {
 347     Printf("|| `[%p, %p]` || LowShadow  ||\n",
 348            (void*)kLowShadowBeg, (void*)kLowShadowEnd);
 349     Printf("|| `[%p, %p]` || LowMem     ||\n",
 350            (void*)kLowMemBeg, (void*)kLowMemEnd);
 351   }
 352   Printf("MemToShadow(shadow): %p %p",
 353          (void*)MEM_TO_SHADOW(kLowShadowBeg),
 354          (void*)MEM_TO_SHADOW(kLowShadowEnd));
 355   if (kHighMemBeg) {
 356     Printf(" %p %p",
 357            (void*)MEM_TO_SHADOW(kHighShadowBeg),
 358            (void*)MEM_TO_SHADOW(kHighShadowEnd));
 359   }
 360   if (kMidMemBeg) {
 361     Printf(" %p %p",
 362            (void*)MEM_TO_SHADOW(kMidShadowBeg),
 363            (void*)MEM_TO_SHADOW(kMidShadowEnd));
 364   }
 365   Printf("\n");
 366   Printf("redzone=%zu\n", (uptr)flags()->redzone);
 367   Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
 368   Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
 369   Printf("thread_local_quarantine_size_kb=%zuK\n",
 370          (uptr)flags()->thread_local_quarantine_size_kb);
 371   Printf("malloc_context_size=%zu\n",
 372          (uptr)common_flags()->malloc_context_size);
 373
 374   Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
 375   Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
 376   Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
 377   CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
 378   if (kMidMemBeg)
 379     CHECK(kMidShadowBeg > kLowShadowEnd &&
 380           kMidMemBeg > kMidShadowEnd &&
 381           kHighShadowBeg > kMidMemEnd);
 382 }
 383
 384 static void AsanInitInternal() {
 385   if (LIKELY(asan_inited)) return;
 386   SanitizerToolName = "AddressSanitizer";
 387   CHECK(!asan_init_is_running && "ASan init calls itself!");
 388   asan_init_is_running = true;
 389
 390   CacheBinaryName();
 391   CheckASLR();
 392
 393   // Initialize flags. This must be done early, because most of the
 394   // initialization steps look at flags().
 395   InitializeFlags();
 396
 397   AsanCheckIncompatibleRT();
 398   AsanCheckDynamicRTPrereqs();
 399   AvoidCVE_2016_2143();
 400
 401   SetCanPoisonMemory(flags()->poison_heap);
 402   SetMallocContextSize(common_flags()->malloc_context_size);
 403
 404   InitializePlatformExceptionHandlers();
 405
 406   InitializeHighMemEnd();
 407
 408   // Make sure we are not statically linked.
 409   AsanDoesNotSupportStaticLinkage();
 410
 411   // Install tool-specific callbacks in sanitizer_common.
 412   AddDieCallback(AsanDie);
 413   SetCheckFailedCallback(AsanCheckFailed);
 414   SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
 415
 416   __sanitizer_set_report_path(common_flags()->log_path);
 417
 418   __asan_option_detect_stack_use_after_return =
 419       flags()->detect_stack_use_after_return;
 420
 421   // Re-exec ourselves if we need to set additional env or command line args.
 422   MaybeReexec();
 423
 424   // Setup internal allocator callback.
 425   SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
 426   SetLowLevelAllocateCallback(OnLowLevelAllocate);
 427
 428   InitializeAsanInterceptors();
 429
 430   // Enable system log ("adb logcat") on Android.
 431   // Doing this before interceptors are initialized crashes in:
 432   // AsanInitInternal -> android_log_write -> __interceptor_strcmp
 433   AndroidLogInit();
 434
 435   ReplaceSystemMalloc();
 436
 437   DisableCoreDumperIfNecessary();
 438
 439   InitializeShadowMemory();
 440
 441   AsanTSDInit(PlatformTSDDtor);
 442   InstallDeadlySignalHandlers(AsanOnDeadlySignal);
 443
 444   AllocatorOptions allocator_options;
 445   allocator_options.SetFrom(flags(), common_flags());
 446   InitializeAllocator(allocator_options);
 447
 448   MaybeStartBackgroudThread();
 449   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 450
 451   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
 452   // should be set to 1 prior to initializing the threads.
 453   asan_inited = 1;
 454   asan_init_is_running = false;
 455
 456   if (flags()->atexit)
 457     Atexit(asan_atexit);
 458
 459   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 460
 461   // Now that ASan runtime is (mostly) initialized, deactivate it if
 462   // necessary, so that it can be re-activated when requested.
 463   if (flags()->start_deactivated)
 464     AsanDeactivate();
 465
 466   // interceptors
 467   InitTlsSize();
 468
 469   // Create main thread.
 470   AsanThread *main_thread = CreateMainThread();
 471   CHECK_EQ(0, main_thread->tid());
 472   force_interface_symbols();  // no-op.
 473   SanitizerInitializeUnwinder();
 474
 475   if (CAN_SANITIZE_LEAKS) {
 476     __lsan::InitCommonLsan();
 477     if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
 478       if (flags()->halt_on_error)
 479         Atexit(__lsan::DoLeakCheck);
 480       else
 481         Atexit(__lsan::DoRecoverableLeakCheckVoid);
 482     }
 483   }
 484
 485 #if CAN_SANITIZE_UB
 486   __ubsan::InitAsPlugin();
 487 #endif
 488
 489   InitializeSuppressions();
 490
 491   if (CAN_SANITIZE_LEAKS) {
 492     // LateInitialize() calls dlsym, which can allocate an error string buffer
 493     // in the TLS.  Let's ignore the allocation to avoid reporting a leak.
 494     __lsan::ScopedInterceptorDisabler disabler;
 495     Symbolizer::LateInitialize();
 496   } else {
 497     Symbolizer::LateInitialize();
 498   }
 499
 500   VReport(1, "AddressSanitizer Init done\n");
 501
 502   if (flags()->sleep_after_init) {
 503     Report("Sleeping for %d second(s)\n", flags()->sleep_after_init);
 504     SleepForSeconds(flags()->sleep_after_init);
 505   }
 506 }
 507
 508 // Initialize as requested from some part of ASan runtime library (interceptors,
 509 // allocator, etc).
 510 void AsanInitFromRtl() {
 511   AsanInitInternal();
 512 }
 513
 514 #if ASAN_DYNAMIC
 515 // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
 516 // (and thus normal initializers from .preinit_array or modules haven't run).
 517
 518 class AsanInitializer {
 519 public:  // NOLINT
 520   AsanInitializer() {
 521     AsanInitFromRtl();
 522   }
 523 };
 524
 525 static AsanInitializer asan_initializer;
 526 #endif  // ASAN_DYNAMIC
 527
 528 } // namespace __asan
 529
 530 // ---------------------- Interface ---------------- {{{1
 531 using namespace __asan;  // NOLINT
 532
 533 void NOINLINE __asan_handle_no_return() {
 534   if (asan_init_is_running)
 535     return;
 536
 537   int local_stack;
 538   AsanThread *curr_thread = GetCurrentThread();
 539   uptr PageSize = GetPageSizeCached();
 540   uptr top, bottom;
 541   if (curr_thread) {
 542     top = curr_thread->stack_top();
 543     bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
 544   } else if (SANITIZER_RTEMS) {
 545     // Give up On RTEMS.
 546     return;
 547   } else {
 548     CHECK(!SANITIZER_FUCHSIA);
 549     // If we haven't seen this thread, try asking the OS for stack bounds.
 550     uptr tls_addr, tls_size, stack_size;
 551     GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
 552                          &tls_size);
 553     top = bottom + stack_size;
 554   }
 555   static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
 556   if (top - bottom > kMaxExpectedCleanupSize) {
 557     static bool reported_warning = false;
 558     if (reported_warning)
 559       return;
 560     reported_warning = true;
 561     Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
 562            "stack top: %p; bottom %p; size: %p (%zd)\n"
 563            "False positive error reports may follow\n"
 564            "For details see "
 565            "https://github.com/google/sanitizers/issues/189\n",
 566            top, bottom, top - bottom, top - bottom);
 567     return;
 568   }
 569   PoisonShadow(bottom, top - bottom, 0);
 570   if (curr_thread && curr_thread->has_fake_stack())
 571     curr_thread->fake_stack()->HandleNoReturn();
 572 }
 573
 574 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
 575   SetUserDieCallback(callback);
 576 }
 577
 578 // Initialize as requested from instrumented application code.
 579 // We use this call as a trigger to wake up ASan from deactivated state.
 580 void __asan_init() {
 581   AsanActivate();
 582   AsanInitInternal();
 583 }
 584
 585 void __asan_version_mismatch_check() {
 586   // Do nothing.
 587 }