contrib/compiler-rt/lib/asan/asan_rtl.cc

   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
  15 #include "asan_activation.h"
  16 #include "asan_allocator.h"
  17 #include "asan_interceptors.h"
  18 #include "asan_interface_internal.h"
  19 #include "asan_internal.h"
  20 #include "asan_mapping.h"
  21 #include "asan_poisoning.h"
  22 #include "asan_report.h"
  23 #include "asan_stack.h"
  24 #include "asan_stats.h"
  25 #include "asan_suppressions.h"
  26 #include "asan_thread.h"
  27 #include "sanitizer_common/sanitizer_atomic.h"
  28 #include "sanitizer_common/sanitizer_flags.h"
  29 #include "sanitizer_common/sanitizer_libc.h"
  30 #include "sanitizer_common/sanitizer_symbolizer.h"
  31 #include "lsan/lsan_common.h"
  32 #include "ubsan/ubsan_init.h"
  33 #include "ubsan/ubsan_platform.h"
  34
  35 uptr __asan_shadow_memory_dynamic_address;  // Global interface symbol.
  36 int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
  37 uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
  38
  39 namespace __asan {
  40
  41 uptr AsanMappingProfile[kAsanMappingProfileSize];
  42
  43 static void AsanDie() {
  44   static atomic_uint32_t num_calls;
  45   if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
  46     // Don't die twice - run a busy loop.
  47     while (1) { }
  48   }
  49   if (common_flags()->print_module_map >= 1) PrintModuleMap();
  50   if (flags()->sleep_before_dying) {
  51     Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
  52     SleepForSeconds(flags()->sleep_before_dying);
  53   }
  54   if (flags()->unmap_shadow_on_exit) {
  55     if (kMidMemBeg) {
  56       UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
  57       UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
  58     } else {
  59       if (kHighShadowEnd)
  60         UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
  61     }
  62   }
  63 }
  64
  65 static void AsanCheckFailed(const char *file, int line, const char *cond,
  66                             u64 v1, u64 v2) {
  67   Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
  68          line, cond, (uptr)v1, (uptr)v2);
  69
  70   // Print a stack trace the first time we come here. Otherwise, we probably
  71   // failed a CHECK during symbolization.
  72   static atomic_uint32_t num_calls;
  73   if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) == 0) {
  74     PRINT_CURRENT_STACK_CHECK();
  75   }
  76
  77   Die();
  78 }
  79
  80 // -------------------------- Globals --------------------- {{{1
  81 int asan_inited;
  82 bool asan_init_is_running;
  83
  84 #if !ASAN_FIXED_MAPPING
  85 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
  86 #endif
  87
  88 // -------------------------- Misc ---------------- {{{1
  89 void ShowStatsAndAbort() {
  90   __asan_print_accumulated_stats();
  91   Die();
  92 }
  93
  94 // --------------- LowLevelAllocateCallbac ---------- {{{1
  95 static void OnLowLevelAllocate(uptr ptr, uptr size) {
  96   PoisonShadow(ptr, size, kAsanInternalHeapMagic);
  97 }
  98
  99 // -------------------------- Run-time entry ------------------- {{{1
 100 // exported functions
 101 #define ASAN_REPORT_ERROR(type, is_write, size)                     \
 102 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 103 void __asan_report_ ## type ## size(uptr addr) {                    \
 104   GET_CALLER_PC_BP_SP;                                              \
 105   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);    \
 106 }                                                                   \
 107 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 108 void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
 109   GET_CALLER_PC_BP_SP;                                              \
 110   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);  \
 111 }                                                                   \
 112 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 113 void __asan_report_ ## type ## size ## _noabort(uptr addr) {        \
 114   GET_CALLER_PC_BP_SP;                                              \
 115   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);   \
 116 }                                                                   \
 117
 118 ASAN_REPORT_ERROR(load, false, 1)
 119 ASAN_REPORT_ERROR(load, false, 2)
 120 ASAN_REPORT_ERROR(load, false, 4)
 121 ASAN_REPORT_ERROR(load, false, 8)
 122 ASAN_REPORT_ERROR(load, false, 16)
 123 ASAN_REPORT_ERROR(store, true, 1)
 124 ASAN_REPORT_ERROR(store, true, 2)
 125 ASAN_REPORT_ERROR(store, true, 4)
 126 ASAN_REPORT_ERROR(store, true, 8)
 127 ASAN_REPORT_ERROR(store, true, 16)
 128
 129 #define ASAN_REPORT_ERROR_N(type, is_write)                                 \
 130 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 131 void __asan_report_ ## type ## _n(uptr addr, uptr size) {                   \
 132   GET_CALLER_PC_BP_SP;                                                      \
 133   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);            \
 134 }                                                                           \
 135 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 136 void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
 137   GET_CALLER_PC_BP_SP;                                                      \
 138   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);          \
 139 }                                                                           \
 140 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 141 void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) {           \
 142   GET_CALLER_PC_BP_SP;                                                      \
 143   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);           \
 144 }                                                                           \
 145
 146 ASAN_REPORT_ERROR_N(load, false)
 147 ASAN_REPORT_ERROR_N(store, true)
 148
 149 #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
 150     if (SANITIZER_MYRIAD2 && !AddrIsInMem(addr) && !AddrIsInShadow(addr))      \
 151       return;                                                                  \
 152     uptr sp = MEM_TO_SHADOW(addr);                                             \
 153     uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp)          \
 154                                         : *reinterpret_cast<u16 *>(sp);        \
 155     if (UNLIKELY(s)) {                                                         \
 156       if (UNLIKELY(size >= SHADOW_GRANULARITY ||                               \
 157                    ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >=     \
 158                        (s8)s)) {                                               \
 159         if (__asan_test_only_reported_buggy_pointer) {                         \
 160           *__asan_test_only_reported_buggy_pointer = addr;                     \
 161         } else {                                                               \
 162           GET_CALLER_PC_BP_SP;                                                 \
 163           ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg,        \
 164                               fatal);                                          \
 165         }                                                                      \
 166       }                                                                        \
 167     }
 168
 169 #define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size)                      \
 170   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 171   void __asan_##type##size(uptr addr) {                                        \
 172     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true)            \
 173   }                                                                            \
 174   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 175   void __asan_exp_##type##size(uptr addr, u32 exp) {                           \
 176     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true)          \
 177   }                                                                            \
 178   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 179   void __asan_##type##size ## _noabort(uptr addr) {                            \
 180     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false)           \
 181   }                                                                            \
 182
 183 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
 184 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
 185 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
 186 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
 187 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
 188 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
 189 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
 190 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
 191 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
 192 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
 193
 194 extern "C"
 195 NOINLINE INTERFACE_ATTRIBUTE
 196 void __asan_loadN(uptr addr, uptr size) {
 197   if (__asan_region_is_poisoned(addr, size)) {
 198     GET_CALLER_PC_BP_SP;
 199     ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
 200   }
 201 }
 202
 203 extern "C"
 204 NOINLINE INTERFACE_ATTRIBUTE
 205 void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
 206   if (__asan_region_is_poisoned(addr, size)) {
 207     GET_CALLER_PC_BP_SP;
 208     ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
 209   }
 210 }
 211
 212 extern "C"
 213 NOINLINE INTERFACE_ATTRIBUTE
 214 void __asan_loadN_noabort(uptr addr, uptr size) {
 215   if (__asan_region_is_poisoned(addr, size)) {
 216     GET_CALLER_PC_BP_SP;
 217     ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
 218   }
 219 }
 220
 221 extern "C"
 222 NOINLINE INTERFACE_ATTRIBUTE
 223 void __asan_storeN(uptr addr, uptr size) {
 224   if (__asan_region_is_poisoned(addr, size)) {
 225     GET_CALLER_PC_BP_SP;
 226     ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
 227   }
 228 }
 229
 230 extern "C"
 231 NOINLINE INTERFACE_ATTRIBUTE
 232 void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
 233   if (__asan_region_is_poisoned(addr, size)) {
 234     GET_CALLER_PC_BP_SP;
 235     ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
 236   }
 237 }
 238
 239 extern "C"
 240 NOINLINE INTERFACE_ATTRIBUTE
 241 void __asan_storeN_noabort(uptr addr, uptr size) {
 242   if (__asan_region_is_poisoned(addr, size)) {
 243     GET_CALLER_PC_BP_SP;
 244     ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
 245   }
 246 }
 247
 248 // Force the linker to keep the symbols for various ASan interface functions.
 249 // We want to keep those in the executable in order to let the instrumented
 250 // dynamic libraries access the symbol even if it is not used by the executable
 251 // itself. This should help if the build system is removing dead code at link
 252 // time.
 253 static NOINLINE void force_interface_symbols() {
 254   volatile int fake_condition = 0;  // prevent dead condition elimination.
 255   // __asan_report_* functions are noreturn, so we need a switch to prevent
 256   // the compiler from removing any of them.
 257   // clang-format off
 258   switch (fake_condition) {
 259     case 1: __asan_report_load1(0); break;
 260     case 2: __asan_report_load2(0); break;
 261     case 3: __asan_report_load4(0); break;
 262     case 4: __asan_report_load8(0); break;
 263     case 5: __asan_report_load16(0); break;
 264     case 6: __asan_report_load_n(0, 0); break;
 265     case 7: __asan_report_store1(0); break;
 266     case 8: __asan_report_store2(0); break;
 267     case 9: __asan_report_store4(0); break;
 268     case 10: __asan_report_store8(0); break;
 269     case 11: __asan_report_store16(0); break;
 270     case 12: __asan_report_store_n(0, 0); break;
 271     case 13: __asan_report_exp_load1(0, 0); break;
 272     case 14: __asan_report_exp_load2(0, 0); break;
 273     case 15: __asan_report_exp_load4(0, 0); break;
 274     case 16: __asan_report_exp_load8(0, 0); break;
 275     case 17: __asan_report_exp_load16(0, 0); break;
 276     case 18: __asan_report_exp_load_n(0, 0, 0); break;
 277     case 19: __asan_report_exp_store1(0, 0); break;
 278     case 20: __asan_report_exp_store2(0, 0); break;
 279     case 21: __asan_report_exp_store4(0, 0); break;
 280     case 22: __asan_report_exp_store8(0, 0); break;
 281     case 23: __asan_report_exp_store16(0, 0); break;
 282     case 24: __asan_report_exp_store_n(0, 0, 0); break;
 283     case 25: __asan_register_globals(nullptr, 0); break;
 284     case 26: __asan_unregister_globals(nullptr, 0); break;
 285     case 27: __asan_set_death_callback(nullptr); break;
 286     case 28: __asan_set_error_report_callback(nullptr); break;
 287     case 29: __asan_handle_no_return(); break;
 288     case 30: __asan_address_is_poisoned(nullptr); break;
 289     case 31: __asan_poison_memory_region(nullptr, 0); break;
 290     case 32: __asan_unpoison_memory_region(nullptr, 0); break;
 291     case 34: __asan_before_dynamic_init(nullptr); break;
 292     case 35: __asan_after_dynamic_init(); break;
 293     case 36: __asan_poison_stack_memory(0, 0); break;
 294     case 37: __asan_unpoison_stack_memory(0, 0); break;
 295     case 38: __asan_region_is_poisoned(0, 0); break;
 296     case 39: __asan_describe_address(0); break;
 297     case 40: __asan_set_shadow_00(0, 0); break;
 298     case 41: __asan_set_shadow_f1(0, 0); break;
 299     case 42: __asan_set_shadow_f2(0, 0); break;
 300     case 43: __asan_set_shadow_f3(0, 0); break;
 301     case 44: __asan_set_shadow_f5(0, 0); break;
 302     case 45: __asan_set_shadow_f8(0, 0); break;
 303   }
 304   // clang-format on
 305 }
 306
 307 static void asan_atexit() {
 308   Printf("AddressSanitizer exit stats:\n");
 309   __asan_print_accumulated_stats();
 310   // Print AsanMappingProfile.
 311   for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
 312     if (AsanMappingProfile[i] == 0) continue;
 313     Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
 314   }
 315 }
 316
 317 static void InitializeHighMemEnd() {
 318 #if !SANITIZER_MYRIAD2
 319 #if !ASAN_FIXED_MAPPING
 320   kHighMemEnd = GetMaxUserVirtualAddress();
 321   // Increase kHighMemEnd to make sure it's properly
 322   // aligned together with kHighMemBeg:
 323   kHighMemEnd |= SHADOW_GRANULARITY * GetMmapGranularity() - 1;
 324 #endif  // !ASAN_FIXED_MAPPING
 325   CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
 326 #endif  // !SANITIZER_MYRIAD2
 327 }
 328
 329 void PrintAddressSpaceLayout() {
 330   if (kHighMemBeg) {
 331     Printf("|| `[%p, %p]` || HighMem    ||\n",
 332            (void*)kHighMemBeg, (void*)kHighMemEnd);
 333     Printf("|| `[%p, %p]` || HighShadow ||\n",
 334            (void*)kHighShadowBeg, (void*)kHighShadowEnd);
 335   }
 336   if (kMidMemBeg) {
 337     Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
 338            (void*)kShadowGap3Beg, (void*)kShadowGap3End);
 339     Printf("|| `[%p, %p]` || MidMem     ||\n",
 340            (void*)kMidMemBeg, (void*)kMidMemEnd);
 341     Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
 342            (void*)kShadowGap2Beg, (void*)kShadowGap2End);
 343     Printf("|| `[%p, %p]` || MidShadow  ||\n",
 344            (void*)kMidShadowBeg, (void*)kMidShadowEnd);
 345   }
 346   Printf("|| `[%p, %p]` || ShadowGap  ||\n",
 347          (void*)kShadowGapBeg, (void*)kShadowGapEnd);
 348   if (kLowShadowBeg) {
 349     Printf("|| `[%p, %p]` || LowShadow  ||\n",
 350            (void*)kLowShadowBeg, (void*)kLowShadowEnd);
 351     Printf("|| `[%p, %p]` || LowMem     ||\n",
 352            (void*)kLowMemBeg, (void*)kLowMemEnd);
 353   }
 354   Printf("MemToShadow(shadow): %p %p",
 355          (void*)MEM_TO_SHADOW(kLowShadowBeg),
 356          (void*)MEM_TO_SHADOW(kLowShadowEnd));
 357   if (kHighMemBeg) {
 358     Printf(" %p %p",
 359            (void*)MEM_TO_SHADOW(kHighShadowBeg),
 360            (void*)MEM_TO_SHADOW(kHighShadowEnd));
 361   }
 362   if (kMidMemBeg) {
 363     Printf(" %p %p",
 364            (void*)MEM_TO_SHADOW(kMidShadowBeg),
 365            (void*)MEM_TO_SHADOW(kMidShadowEnd));
 366   }
 367   Printf("\n");
 368   Printf("redzone=%zu\n", (uptr)flags()->redzone);
 369   Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
 370   Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
 371   Printf("thread_local_quarantine_size_kb=%zuK\n",
 372          (uptr)flags()->thread_local_quarantine_size_kb);
 373   Printf("malloc_context_size=%zu\n",
 374          (uptr)common_flags()->malloc_context_size);
 375
 376   Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
 377   Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
 378   Printf("SHADOW_OFFSET: 0x%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 static void AsanInitInternal() {
 387   if (LIKELY(asan_inited)) return;
 388   SanitizerToolName = "AddressSanitizer";
 389   CHECK(!asan_init_is_running && "ASan init calls itself!");
 390   asan_init_is_running = true;
 391
 392   CacheBinaryName();
 393   CheckASLR();
 394
 395   // Initialize flags. This must be done early, because most of the
 396   // initialization steps look at flags().
 397   InitializeFlags();
 398
 399   AsanCheckIncompatibleRT();
 400   AsanCheckDynamicRTPrereqs();
 401   AvoidCVE_2016_2143();
 402
 403   SetCanPoisonMemory(flags()->poison_heap);
 404   SetMallocContextSize(common_flags()->malloc_context_size);
 405
 406   InitializePlatformExceptionHandlers();
 407
 408   InitializeHighMemEnd();
 409
 410   // Make sure we are not statically linked.
 411   AsanDoesNotSupportStaticLinkage();
 412
 413   // Install tool-specific callbacks in sanitizer_common.
 414   AddDieCallback(AsanDie);
 415   SetCheckFailedCallback(AsanCheckFailed);
 416   SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
 417
 418   __sanitizer_set_report_path(common_flags()->log_path);
 419
 420   __asan_option_detect_stack_use_after_return =
 421       flags()->detect_stack_use_after_return;
 422
 423   // Re-exec ourselves if we need to set additional env or command line args.
 424   MaybeReexec();
 425
 426   // Setup internal allocator callback.
 427   SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
 428   SetLowLevelAllocateCallback(OnLowLevelAllocate);
 429
 430   InitializeAsanInterceptors();
 431
 432   // Enable system log ("adb logcat") on Android.
 433   // Doing this before interceptors are initialized crashes in:
 434   // AsanInitInternal -> android_log_write -> __interceptor_strcmp
 435   AndroidLogInit();
 436
 437   ReplaceSystemMalloc();
 438
 439   DisableCoreDumperIfNecessary();
 440
 441   InitializeShadowMemory();
 442
 443   AsanTSDInit(PlatformTSDDtor);
 444   InstallDeadlySignalHandlers(AsanOnDeadlySignal);
 445
 446   AllocatorOptions allocator_options;
 447   allocator_options.SetFrom(flags(), common_flags());
 448   InitializeAllocator(allocator_options);
 449
 450   MaybeStartBackgroudThread();
 451   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 452
 453   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
 454   // should be set to 1 prior to initializing the threads.
 455   asan_inited = 1;
 456   asan_init_is_running = false;
 457
 458   if (flags()->atexit)
 459     Atexit(asan_atexit);
 460
 461   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 462
 463   // Now that ASan runtime is (mostly) initialized, deactivate it if
 464   // necessary, so that it can be re-activated when requested.
 465   if (flags()->start_deactivated)
 466     AsanDeactivate();
 467
 468   // interceptors
 469   InitTlsSize();
 470
 471   // Create main thread.
 472   AsanThread *main_thread = CreateMainThread();
 473   CHECK_EQ(0, main_thread->tid());
 474   force_interface_symbols();  // no-op.
 475   SanitizerInitializeUnwinder();
 476
 477   if (CAN_SANITIZE_LEAKS) {
 478     __lsan::InitCommonLsan();
 479     if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
 480       if (flags()->halt_on_error)
 481         Atexit(__lsan::DoLeakCheck);
 482       else
 483         Atexit(__lsan::DoRecoverableLeakCheckVoid);
 484     }
 485   }
 486
 487 #if CAN_SANITIZE_UB
 488   __ubsan::InitAsPlugin();
 489 #endif
 490
 491   InitializeSuppressions();
 492
 493   if (CAN_SANITIZE_LEAKS) {
 494     // LateInitialize() calls dlsym, which can allocate an error string buffer
 495     // in the TLS.  Let's ignore the allocation to avoid reporting a leak.
 496     __lsan::ScopedInterceptorDisabler disabler;
 497     Symbolizer::LateInitialize();
 498   } else {
 499     Symbolizer::LateInitialize();
 500   }
 501
 502   VReport(1, "AddressSanitizer Init done\n");
 503
 504   if (flags()->sleep_after_init) {
 505     Report("Sleeping for %d second(s)\n", flags()->sleep_after_init);
 506     SleepForSeconds(flags()->sleep_after_init);
 507   }
 508 }
 509
 510 // Initialize as requested from some part of ASan runtime library (interceptors,
 511 // allocator, etc).
 512 void AsanInitFromRtl() {
 513   AsanInitInternal();
 514 }
 515
 516 #if ASAN_DYNAMIC
 517 // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
 518 // (and thus normal initializers from .preinit_array or modules haven't run).
 519
 520 class AsanInitializer {
 521 public:  // NOLINT
 522   AsanInitializer() {
 523     AsanInitFromRtl();
 524   }
 525 };
 526
 527 static AsanInitializer asan_initializer;
 528 #endif  // ASAN_DYNAMIC
 529
 530 } // namespace __asan
 531
 532 // ---------------------- Interface ---------------- {{{1
 533 using namespace __asan;  // NOLINT
 534
 535 void NOINLINE __asan_handle_no_return() {
 536   if (asan_init_is_running)
 537     return;
 538
 539   int local_stack;
 540   AsanThread *curr_thread = GetCurrentThread();
 541   uptr PageSize = GetPageSizeCached();
 542   uptr top, bottom;
 543   if (curr_thread) {
 544     top = curr_thread->stack_top();
 545     bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
 546   } else if (SANITIZER_RTEMS) {
 547     // Give up On RTEMS.
 548     return;
 549   } else {
 550     CHECK(!SANITIZER_FUCHSIA);
 551     // If we haven't seen this thread, try asking the OS for stack bounds.
 552     uptr tls_addr, tls_size, stack_size;
 553     GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
 554                          &tls_size);
 555     top = bottom + stack_size;
 556   }
 557   static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
 558   if (top - bottom > kMaxExpectedCleanupSize) {
 559     static bool reported_warning = false;
 560     if (reported_warning)
 561       return;
 562     reported_warning = true;
 563     Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
 564            "stack top: %p; bottom %p; size: %p (%zd)\n"
 565            "False positive error reports may follow\n"
 566            "For details see "
 567            "https://github.com/google/sanitizers/issues/189\n",
 568            top, bottom, top - bottom, top - bottom);
 569     return;
 570   }
 571   PoisonShadow(bottom, top - bottom, 0);
 572   if (curr_thread && curr_thread->has_fake_stack())
 573     curr_thread->fake_stack()->HandleNoReturn();
 574 }
 575
 576 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
 577   SetUserDieCallback(callback);
 578 }
 579
 580 // Initialize as requested from instrumented application code.
 581 // We use this call as a trigger to wake up ASan from deactivated state.
 582 void __asan_init() {
 583   AsanActivate();
 584   AsanInitInternal();
 585 }
 586
 587 void __asan_version_mismatch_check() {
 588   // Do nothing.
 589 }