libsanitizer/asan/asan_rtl.cpp

   1 //===-- asan_rtl.cpp ------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of AddressSanitizer, an address sanity checker.
  10 //
  11 // Main file of the ASan run-time library.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "asan_activation.h"
  15 #include "asan_allocator.h"
  16 #include "asan_fake_stack.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 "lsan/lsan_common.h"
  28 #include "sanitizer_common/sanitizer_atomic.h"
  29 #include "sanitizer_common/sanitizer_flags.h"
  30 #include "sanitizer_common/sanitizer_libc.h"
  31 #include "sanitizer_common/sanitizer_symbolizer.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)
  50     DumpProcessMap();
  51   if (flags()->sleep_before_dying) {
  52     Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
  53     SleepForSeconds(flags()->sleep_before_dying);
  54   }
  55   if (flags()->unmap_shadow_on_exit) {
  56     if (kMidMemBeg) {
  57       UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
  58       UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
  59     } else {
  60       if (kHighShadowEnd)
  61         UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
  62     }
  63   }
  64 }
  65
  66 static void CheckUnwind() {
  67   GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_check);
  68   stack.Print();
  69 }
  70
  71 // -------------------------- Globals --------------------- {{{1
  72 int asan_inited;
  73 bool asan_init_is_running;
  74
  75 #if !ASAN_FIXED_MAPPING
  76 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
  77 #endif
  78
  79 // -------------------------- Misc ---------------- {{{1
  80 void ShowStatsAndAbort() {
  81   __asan_print_accumulated_stats();
  82   Die();
  83 }
  84
  85 NOINLINE
  86 static void ReportGenericErrorWrapper(uptr addr, bool is_write, int size,
  87                                       int exp_arg, bool fatal) {
  88   if (__asan_test_only_reported_buggy_pointer) {
  89     *__asan_test_only_reported_buggy_pointer = addr;
  90   } else {
  91     GET_CALLER_PC_BP_SP;
  92     ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, fatal);
  93   }
  94 }
  95
  96 // --------------- LowLevelAllocateCallbac ---------- {{{1
  97 static void OnLowLevelAllocate(uptr ptr, uptr size) {
  98   PoisonShadow(ptr, size, kAsanInternalHeapMagic);
  99 }
 100
 101 // -------------------------- Run-time entry ------------------- {{{1
 102 // exported functions
 103 #define ASAN_REPORT_ERROR(type, is_write, size)                     \
 104 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 105 void __asan_report_ ## type ## size(uptr addr) {                    \
 106   GET_CALLER_PC_BP_SP;                                              \
 107   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);    \
 108 }                                                                   \
 109 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 110 void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
 111   GET_CALLER_PC_BP_SP;                                              \
 112   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);  \
 113 }                                                                   \
 114 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 115 void __asan_report_ ## type ## size ## _noabort(uptr addr) {        \
 116   GET_CALLER_PC_BP_SP;                                              \
 117   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);   \
 118 }                                                                   \
 119
 120 ASAN_REPORT_ERROR(load, false, 1)
 121 ASAN_REPORT_ERROR(load, false, 2)
 122 ASAN_REPORT_ERROR(load, false, 4)
 123 ASAN_REPORT_ERROR(load, false, 8)
 124 ASAN_REPORT_ERROR(load, false, 16)
 125 ASAN_REPORT_ERROR(store, true, 1)
 126 ASAN_REPORT_ERROR(store, true, 2)
 127 ASAN_REPORT_ERROR(store, true, 4)
 128 ASAN_REPORT_ERROR(store, true, 8)
 129 ASAN_REPORT_ERROR(store, true, 16)
 130
 131 #define ASAN_REPORT_ERROR_N(type, is_write)                                 \
 132 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 133 void __asan_report_ ## type ## _n(uptr addr, uptr size) {                   \
 134   GET_CALLER_PC_BP_SP;                                                      \
 135   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);            \
 136 }                                                                           \
 137 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 138 void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
 139   GET_CALLER_PC_BP_SP;                                                      \
 140   ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);          \
 141 }                                                                           \
 142 extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
 143 void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) {           \
 144   GET_CALLER_PC_BP_SP;                                                      \
 145   ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);           \
 146 }                                                                           \
 147
 148 ASAN_REPORT_ERROR_N(load, false)
 149 ASAN_REPORT_ERROR_N(store, true)
 150
 151 #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
 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       ReportGenericErrorWrapper(addr, is_write, size, exp_arg, fatal);         \
 160     }                                                                          \
 161   }
 162
 163 #define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size)                      \
 164   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 165   void __asan_##type##size(uptr addr) {                                        \
 166     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true)            \
 167   }                                                                            \
 168   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 169   void __asan_exp_##type##size(uptr addr, u32 exp) {                           \
 170     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true)          \
 171   }                                                                            \
 172   extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
 173   void __asan_##type##size ## _noabort(uptr addr) {                            \
 174     ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false)           \
 175   }                                                                            \
 176
 177 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
 178 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
 179 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
 180 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
 181 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
 182 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
 183 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
 184 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
 185 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
 186 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
 187
 188 extern "C"
 189 NOINLINE INTERFACE_ATTRIBUTE
 190 void __asan_loadN(uptr addr, uptr size) {
 191   if (__asan_region_is_poisoned(addr, size)) {
 192     GET_CALLER_PC_BP_SP;
 193     ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
 194   }
 195 }
 196
 197 extern "C"
 198 NOINLINE INTERFACE_ATTRIBUTE
 199 void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
 200   if (__asan_region_is_poisoned(addr, size)) {
 201     GET_CALLER_PC_BP_SP;
 202     ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
 203   }
 204 }
 205
 206 extern "C"
 207 NOINLINE INTERFACE_ATTRIBUTE
 208 void __asan_loadN_noabort(uptr addr, uptr size) {
 209   if (__asan_region_is_poisoned(addr, size)) {
 210     GET_CALLER_PC_BP_SP;
 211     ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
 212   }
 213 }
 214
 215 extern "C"
 216 NOINLINE INTERFACE_ATTRIBUTE
 217 void __asan_storeN(uptr addr, uptr size) {
 218   if (__asan_region_is_poisoned(addr, size)) {
 219     GET_CALLER_PC_BP_SP;
 220     ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
 221   }
 222 }
 223
 224 extern "C"
 225 NOINLINE INTERFACE_ATTRIBUTE
 226 void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
 227   if (__asan_region_is_poisoned(addr, size)) {
 228     GET_CALLER_PC_BP_SP;
 229     ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
 230   }
 231 }
 232
 233 extern "C"
 234 NOINLINE INTERFACE_ATTRIBUTE
 235 void __asan_storeN_noabort(uptr addr, uptr size) {
 236   if (__asan_region_is_poisoned(addr, size)) {
 237     GET_CALLER_PC_BP_SP;
 238     ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
 239   }
 240 }
 241
 242 // Force the linker to keep the symbols for various ASan interface functions.
 243 // We want to keep those in the executable in order to let the instrumented
 244 // dynamic libraries access the symbol even if it is not used by the executable
 245 // itself. This should help if the build system is removing dead code at link
 246 // time.
 247 static NOINLINE void force_interface_symbols() {
 248   volatile int fake_condition = 0;  // prevent dead condition elimination.
 249   // __asan_report_* functions are noreturn, so we need a switch to prevent
 250   // the compiler from removing any of them.
 251   // clang-format off
 252   switch (fake_condition) {
 253     case 1: __asan_report_load1(0); break;
 254     case 2: __asan_report_load2(0); break;
 255     case 3: __asan_report_load4(0); break;
 256     case 4: __asan_report_load8(0); break;
 257     case 5: __asan_report_load16(0); break;
 258     case 6: __asan_report_load_n(0, 0); break;
 259     case 7: __asan_report_store1(0); break;
 260     case 8: __asan_report_store2(0); break;
 261     case 9: __asan_report_store4(0); break;
 262     case 10: __asan_report_store8(0); break;
 263     case 11: __asan_report_store16(0); break;
 264     case 12: __asan_report_store_n(0, 0); break;
 265     case 13: __asan_report_exp_load1(0, 0); break;
 266     case 14: __asan_report_exp_load2(0, 0); break;
 267     case 15: __asan_report_exp_load4(0, 0); break;
 268     case 16: __asan_report_exp_load8(0, 0); break;
 269     case 17: __asan_report_exp_load16(0, 0); break;
 270     case 18: __asan_report_exp_load_n(0, 0, 0); break;
 271     case 19: __asan_report_exp_store1(0, 0); break;
 272     case 20: __asan_report_exp_store2(0, 0); break;
 273     case 21: __asan_report_exp_store4(0, 0); break;
 274     case 22: __asan_report_exp_store8(0, 0); break;
 275     case 23: __asan_report_exp_store16(0, 0); break;
 276     case 24: __asan_report_exp_store_n(0, 0, 0); break;
 277     case 25: __asan_register_globals(nullptr, 0); break;
 278     case 26: __asan_unregister_globals(nullptr, 0); break;
 279     case 27: __asan_set_death_callback(nullptr); break;
 280     case 28: __asan_set_error_report_callback(nullptr); break;
 281     case 29: __asan_handle_no_return(); break;
 282     case 30: __asan_address_is_poisoned(nullptr); break;
 283     case 31: __asan_poison_memory_region(nullptr, 0); break;
 284     case 32: __asan_unpoison_memory_region(nullptr, 0); break;
 285     case 34: __asan_before_dynamic_init(nullptr); break;
 286     case 35: __asan_after_dynamic_init(); break;
 287     case 36: __asan_poison_stack_memory(0, 0); break;
 288     case 37: __asan_unpoison_stack_memory(0, 0); break;
 289     case 38: __asan_region_is_poisoned(0, 0); break;
 290     case 39: __asan_describe_address(0); break;
 291     case 40: __asan_set_shadow_00(0, 0); break;
 292     case 41: __asan_set_shadow_f1(0, 0); break;
 293     case 42: __asan_set_shadow_f2(0, 0); break;
 294     case 43: __asan_set_shadow_f3(0, 0); break;
 295     case 44: __asan_set_shadow_f5(0, 0); break;
 296     case 45: __asan_set_shadow_f8(0, 0); break;
 297   }
 298   // clang-format on
 299 }
 300
 301 static void asan_atexit() {
 302   Printf("AddressSanitizer exit stats:\n");
 303   __asan_print_accumulated_stats();
 304   // Print AsanMappingProfile.
 305   for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
 306     if (AsanMappingProfile[i] == 0) continue;
 307     Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
 308   }
 309 }
 310
 311 static void InitializeHighMemEnd() {
 312 #if !ASAN_FIXED_MAPPING
 313   kHighMemEnd = GetMaxUserVirtualAddress();
 314   // Increase kHighMemEnd to make sure it's properly
 315   // aligned together with kHighMemBeg:
 316   kHighMemEnd |= (GetMmapGranularity() << SHADOW_SCALE) - 1;
 317 #endif  // !ASAN_FIXED_MAPPING
 318   CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
 319 }
 320
 321 void PrintAddressSpaceLayout() {
 322   if (kHighMemBeg) {
 323     Printf("|| `[%p, %p]` || HighMem    ||\n",
 324            (void*)kHighMemBeg, (void*)kHighMemEnd);
 325     Printf("|| `[%p, %p]` || HighShadow ||\n",
 326            (void*)kHighShadowBeg, (void*)kHighShadowEnd);
 327   }
 328   if (kMidMemBeg) {
 329     Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
 330            (void*)kShadowGap3Beg, (void*)kShadowGap3End);
 331     Printf("|| `[%p, %p]` || MidMem     ||\n",
 332            (void*)kMidMemBeg, (void*)kMidMemEnd);
 333     Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
 334            (void*)kShadowGap2Beg, (void*)kShadowGap2End);
 335     Printf("|| `[%p, %p]` || MidShadow  ||\n",
 336            (void*)kMidShadowBeg, (void*)kMidShadowEnd);
 337   }
 338   Printf("|| `[%p, %p]` || ShadowGap  ||\n",
 339          (void*)kShadowGapBeg, (void*)kShadowGapEnd);
 340   if (kLowShadowBeg) {
 341     Printf("|| `[%p, %p]` || LowShadow  ||\n",
 342            (void*)kLowShadowBeg, (void*)kLowShadowEnd);
 343     Printf("|| `[%p, %p]` || LowMem     ||\n",
 344            (void*)kLowMemBeg, (void*)kLowMemEnd);
 345   }
 346   Printf("MemToShadow(shadow): %p %p",
 347          (void*)MEM_TO_SHADOW(kLowShadowBeg),
 348          (void*)MEM_TO_SHADOW(kLowShadowEnd));
 349   if (kHighMemBeg) {
 350     Printf(" %p %p",
 351            (void*)MEM_TO_SHADOW(kHighShadowBeg),
 352            (void*)MEM_TO_SHADOW(kHighShadowEnd));
 353   }
 354   if (kMidMemBeg) {
 355     Printf(" %p %p",
 356            (void*)MEM_TO_SHADOW(kMidShadowBeg),
 357            (void*)MEM_TO_SHADOW(kMidShadowEnd));
 358   }
 359   Printf("\n");
 360   Printf("redzone=%zu\n", (uptr)flags()->redzone);
 361   Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
 362   Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
 363   Printf("thread_local_quarantine_size_kb=%zuK\n",
 364          (uptr)flags()->thread_local_quarantine_size_kb);
 365   Printf("malloc_context_size=%zu\n",
 366          (uptr)common_flags()->malloc_context_size);
 367
 368   Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
 369   Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
 370   Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
 371   CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
 372   if (kMidMemBeg)
 373     CHECK(kMidShadowBeg > kLowShadowEnd &&
 374           kMidMemBeg > kMidShadowEnd &&
 375           kHighShadowBeg > kMidMemEnd);
 376 }
 377
 378 #if defined(__thumb__) && defined(__linux__)
 379 #define START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
 380 #endif
 381
 382 #ifndef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
 383 static bool UNUSED __local_asan_dyninit = [] {
 384   MaybeStartBackgroudThread();
 385   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 386
 387   return false;
 388 }();
 389 #endif
 390
 391 static void AsanInitInternal() {
 392   if (LIKELY(asan_inited)) return;
 393   SanitizerToolName = "AddressSanitizer";
 394   CHECK(!asan_init_is_running && "ASan init calls itself!");
 395   asan_init_is_running = true;
 396
 397   CacheBinaryName();
 398
 399   // Initialize flags. This must be done early, because most of the
 400   // initialization steps look at flags().
 401   InitializeFlags();
 402
 403   // Stop performing init at this point if we are being loaded via
 404   // dlopen() and the platform supports it.
 405   if (SANITIZER_SUPPORTS_INIT_FOR_DLOPEN && UNLIKELY(HandleDlopenInit())) {
 406     asan_init_is_running = false;
 407     VReport(1, "AddressSanitizer init is being performed for dlopen().\n");
 408     return;
 409   }
 410
 411   AsanCheckIncompatibleRT();
 412   AsanCheckDynamicRTPrereqs();
 413   AvoidCVE_2016_2143();
 414
 415   SetCanPoisonMemory(flags()->poison_heap);
 416   SetMallocContextSize(common_flags()->malloc_context_size);
 417
 418   InitializePlatformExceptionHandlers();
 419
 420   InitializeHighMemEnd();
 421
 422   // Make sure we are not statically linked.
 423   AsanDoesNotSupportStaticLinkage();
 424
 425   // Install tool-specific callbacks in sanitizer_common.
 426   AddDieCallback(AsanDie);
 427   SetCheckUnwindCallback(CheckUnwind);
 428   SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
 429
 430   __sanitizer_set_report_path(common_flags()->log_path);
 431
 432   __asan_option_detect_stack_use_after_return =
 433       flags()->detect_stack_use_after_return;
 434
 435   __sanitizer::InitializePlatformEarly();
 436
 437   // Re-exec ourselves if we need to set additional env or command line args.
 438   MaybeReexec();
 439
 440   // Setup internal allocator callback.
 441   SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
 442   SetLowLevelAllocateCallback(OnLowLevelAllocate);
 443
 444   InitializeAsanInterceptors();
 445   CheckASLR();
 446
 447   // Enable system log ("adb logcat") on Android.
 448   // Doing this before interceptors are initialized crashes in:
 449   // AsanInitInternal -> android_log_write -> __interceptor_strcmp
 450   AndroidLogInit();
 451
 452   ReplaceSystemMalloc();
 453
 454   DisableCoreDumperIfNecessary();
 455
 456   InitializeShadowMemory();
 457
 458   AsanTSDInit(PlatformTSDDtor);
 459   InstallDeadlySignalHandlers(AsanOnDeadlySignal);
 460
 461   AllocatorOptions allocator_options;
 462   allocator_options.SetFrom(flags(), common_flags());
 463   InitializeAllocator(allocator_options);
 464
 465 #ifdef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
 466   MaybeStartBackgroudThread();
 467   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 468 #endif
 469
 470   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
 471   // should be set to 1 prior to initializing the threads.
 472   asan_inited = 1;
 473   asan_init_is_running = false;
 474
 475   if (flags()->atexit)
 476     Atexit(asan_atexit);
 477
 478   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 479
 480   // Now that ASan runtime is (mostly) initialized, deactivate it if
 481   // necessary, so that it can be re-activated when requested.
 482   if (flags()->start_deactivated)
 483     AsanDeactivate();
 484
 485   // interceptors
 486   InitTlsSize();
 487
 488   // Create main thread.
 489   AsanThread *main_thread = CreateMainThread();
 490   CHECK_EQ(0, main_thread->tid());
 491   force_interface_symbols();  // no-op.
 492   SanitizerInitializeUnwinder();
 493
 494   if (CAN_SANITIZE_LEAKS) {
 495     __lsan::InitCommonLsan();
 496     if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
 497       if (flags()->halt_on_error)
 498         Atexit(__lsan::DoLeakCheck);
 499       else
 500         Atexit(__lsan::DoRecoverableLeakCheckVoid);
 501     }
 502   }
 503
 504 #if CAN_SANITIZE_UB
 505   __ubsan::InitAsPlugin();
 506 #endif
 507
 508   InitializeSuppressions();
 509
 510   if (CAN_SANITIZE_LEAKS) {
 511     // LateInitialize() calls dlsym, which can allocate an error string buffer
 512     // in the TLS.  Let's ignore the allocation to avoid reporting a leak.
 513     __lsan::ScopedInterceptorDisabler disabler;
 514     Symbolizer::LateInitialize();
 515   } else {
 516     Symbolizer::LateInitialize();
 517   }
 518
 519   VReport(1, "AddressSanitizer Init done\n");
 520
 521   if (flags()->sleep_after_init) {
 522     Report("Sleeping for %d second(s)\n", flags()->sleep_after_init);
 523     SleepForSeconds(flags()->sleep_after_init);
 524   }
 525 }
 526
 527 // Initialize as requested from some part of ASan runtime library (interceptors,
 528 // allocator, etc).
 529 void AsanInitFromRtl() {
 530   AsanInitInternal();
 531 }
 532
 533 #if ASAN_DYNAMIC
 534 // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
 535 // (and thus normal initializers from .preinit_array or modules haven't run).
 536
 537 class AsanInitializer {
 538  public:
 539   AsanInitializer() {
 540     AsanInitFromRtl();
 541   }
 542 };
 543
 544 static AsanInitializer asan_initializer;
 545 #endif  // ASAN_DYNAMIC
 546
 547 void UnpoisonStack(uptr bottom, uptr top, const char *type) {
 548   static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
 549   if (top - bottom > kMaxExpectedCleanupSize) {
 550     static bool reported_warning = false;
 551     if (reported_warning)
 552       return;
 553     reported_warning = true;
 554     Report(
 555         "WARNING: ASan is ignoring requested __asan_handle_no_return: "
 556         "stack type: %s top: %p; bottom %p; size: %p (%zd)\n"
 557         "False positive error reports may follow\n"
 558         "For details see "
 559         "https://github.com/google/sanitizers/issues/189\n",
 560         type, top, bottom, top - bottom, top - bottom);
 561     return;
 562   }
 563   PoisonShadow(bottom, RoundUpTo(top - bottom, SHADOW_GRANULARITY), 0);
 564 }
 565
 566 static void UnpoisonDefaultStack() {
 567   uptr bottom, top;
 568
 569   if (AsanThread *curr_thread = GetCurrentThread()) {
 570     int local_stack;
 571     const uptr page_size = GetPageSizeCached();
 572     top = curr_thread->stack_top();
 573     bottom = ((uptr)&local_stack - page_size) & ~(page_size - 1);
 574   } else {
 575     CHECK(!SANITIZER_FUCHSIA);
 576     // If we haven't seen this thread, try asking the OS for stack bounds.
 577     uptr tls_addr, tls_size, stack_size;
 578     GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
 579                          &tls_size);
 580     top = bottom + stack_size;
 581   }
 582
 583   UnpoisonStack(bottom, top, "default");
 584 }
 585
 586 static void UnpoisonFakeStack() {
 587   AsanThread *curr_thread = GetCurrentThread();
 588   if (!curr_thread)
 589     return;
 590   FakeStack *stack = curr_thread->get_fake_stack();
 591   if (!stack)
 592     return;
 593   stack->HandleNoReturn();
 594 }
 595
 596 }  // namespace __asan
 597
 598 // ---------------------- Interface ---------------- {{{1
 599 using namespace __asan;
 600
 601 void NOINLINE __asan_handle_no_return() {
 602   if (asan_init_is_running)
 603     return;
 604
 605   if (!PlatformUnpoisonStacks())
 606     UnpoisonDefaultStack();
 607
 608   UnpoisonFakeStack();
 609 }
 610
 611 extern "C" void *__asan_extra_spill_area() {
 612   AsanThread *t = GetCurrentThread();
 613   CHECK(t);
 614   return t->extra_spill_area();
 615 }
 616
 617 void __asan_handle_vfork(void *sp) {
 618   AsanThread *t = GetCurrentThread();
 619   CHECK(t);
 620   uptr bottom = t->stack_bottom();
 621   PoisonShadow(bottom, (uptr)sp - bottom, 0);
 622 }
 623
 624 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
 625   SetUserDieCallback(callback);
 626 }
 627
 628 // Initialize as requested from instrumented application code.
 629 // We use this call as a trigger to wake up ASan from deactivated state.
 630 void __asan_init() {
 631   AsanActivate();
 632   AsanInitInternal();
 633 }
 634
 635 void __asan_version_mismatch_check() {
 636   // Do nothing.
 637 }