src/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 int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
  36 uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
  37
  38 namespace __asan {
  39
  40 uptr AsanMappingProfile[kAsanMappingProfileSize];
  41
  42 static void AsanDie() {
  43   static atomic_uint32_t num_calls;
  44   if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
  45     // Don't die twice - run a busy loop.
  46     while (1) { }
  47   }
  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       UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
  58     }
  59   }
  60 }
  61
  62 static void AsanCheckFailed(const char *file, int line, const char *cond,
  63                             u64 v1, u64 v2) {
  64   Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
  65          line, cond, (uptr)v1, (uptr)v2);
  66   // FIXME: check for infinite recursion without a thread-local counter here.
  67   PRINT_CURRENT_STACK_CHECK();
  68   Die();
  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 // ---------------------- mmap -------------------- {{{1
  86 // Reserve memory range [beg, end].
  87 // We need to use inclusive range because end+1 may not be representable.
  88 void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) {
  89   CHECK_EQ((beg % GetPageSizeCached()), 0);
  90   CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
  91   uptr size = end - beg + 1;
  92   DecreaseTotalMmap(size);  // Don't count the shadow against mmap_limit_mb.
  93   void *res = MmapFixedNoReserve(beg, size, name);
  94   if (res != (void*)beg) {
  95     Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
  96            "Perhaps you're using ulimit -v\n", size);
  97     Abort();
  98   }
  99   if (common_flags()->no_huge_pages_for_shadow)
 100     NoHugePagesInRegion(beg, size);
 101   if (common_flags()->use_madv_dontdump)
 102     DontDumpShadowMemory(beg, size);
 103 }
 104
 105 // --------------- LowLevelAllocateCallbac ---------- {{{1
 106 static void OnLowLevelAllocate(uptr ptr, uptr size) {
 107   PoisonShadow(ptr, size, kAsanInternalHeapMagic);
 108 }
 109
 110 // -------------------------- Run-time entry ------------------- {{{1
 111 // exported functions
 112 #define ASAN_REPORT_ERROR(type, is_write, size)                     \
 113 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 114 void __asan_report_ ## type ## size(uptr addr) {                    \
 115   GET_CALLER_PC_BP_SP;                                              \
 116   __asan_report_error(pc, bp, sp, addr, is_write, size, 0);         \
 117 }                                                                   \
 118 extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
 119 void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
 120   GET_CALLER_PC_BP_SP;                                              \
 121   __asan_report_error(pc, bp, sp, addr, is_write, size, exp);       \
 122 }
 123
 124 ASAN_REPORT_ERROR(load, false, 1)
 125 ASAN_REPORT_ERROR(load, false, 2)
 126 ASAN_REPORT_ERROR(load, false, 4)
 127 ASAN_REPORT_ERROR(load, false, 8)
 128 ASAN_REPORT_ERROR(load, false, 16)
 129 ASAN_REPORT_ERROR(store, true, 1)
 130 ASAN_REPORT_ERROR(store, true, 2)
 131 ASAN_REPORT_ERROR(store, true, 4)
 132 ASAN_REPORT_ERROR(store, true, 8)
 133 ASAN_REPORT_ERROR(store, true, 16)
 134
 135 #define ASAN_REPORT_ERROR_N(type, is_write)                    \
 136 extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
 137 void __asan_report_ ## type ## _n(uptr addr, uptr size) {      \
 138   GET_CALLER_PC_BP_SP;                                         \
 139   __asan_report_error(pc, bp, sp, addr, is_write, size, 0);    \
 140 }                                                              \
 141 extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
 142 void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
 143   GET_CALLER_PC_BP_SP;                                                      \
 144   __asan_report_error(pc, bp, sp, addr, is_write, size, exp);               \
 145 }
 146
 147 ASAN_REPORT_ERROR_N(load, false)
 148 ASAN_REPORT_ERROR_N(store, true)
 149
 150 #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg)        \
 151     uptr sp = MEM_TO_SHADOW(addr);                                             \
 152     uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp)          \
 153                                         : *reinterpret_cast<u16 *>(sp);        \
 154     if (UNLIKELY(s)) {                                                         \
 155       if (UNLIKELY(size >= SHADOW_GRANULARITY ||                               \
 156                    ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >=     \
 157                        (s8)s)) {                                               \
 158         if (__asan_test_only_reported_buggy_pointer) {                         \
 159           *__asan_test_only_reported_buggy_pointer = addr;                     \
 160         } else {                                                               \
 161           GET_CALLER_PC_BP_SP;                                                 \
 162           __asan_report_error(pc, bp, sp, addr, is_write, size, exp_arg);      \
 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)                  \
 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)                \
 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     __asan_report_error(pc, bp, sp, addr, false, size, 0);
 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     __asan_report_error(pc, bp, sp, addr, false, size, exp);
 203   }
 204 }
 205
 206 extern "C"
 207 NOINLINE INTERFACE_ATTRIBUTE
 208 void __asan_storeN(uptr addr, uptr size) {
 209   if (__asan_region_is_poisoned(addr, size)) {
 210     GET_CALLER_PC_BP_SP;
 211     __asan_report_error(pc, bp, sp, addr, true, size, 0);
 212   }
 213 }
 214
 215 extern "C"
 216 NOINLINE INTERFACE_ATTRIBUTE
 217 void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
 218   if (__asan_region_is_poisoned(addr, size)) {
 219     GET_CALLER_PC_BP_SP;
 220     __asan_report_error(pc, bp, sp, addr, true, size, exp);
 221   }
 222 }
 223
 224 // Force the linker to keep the symbols for various ASan interface functions.
 225 // We want to keep those in the executable in order to let the instrumented
 226 // dynamic libraries access the symbol even if it is not used by the executable
 227 // itself. This should help if the build system is removing dead code at link
 228 // time.
 229 static NOINLINE void force_interface_symbols() {
 230   volatile int fake_condition = 0;  // prevent dead condition elimination.
 231   // __asan_report_* functions are noreturn, so we need a switch to prevent
 232   // the compiler from removing any of them.
 233   switch (fake_condition) {
 234     case 1: __asan_report_load1(0); break;
 235     case 2: __asan_report_load2(0); break;
 236     case 3: __asan_report_load4(0); break;
 237     case 4: __asan_report_load8(0); break;
 238     case 5: __asan_report_load16(0); break;
 239     case 6: __asan_report_load_n(0, 0); break;
 240     case 7: __asan_report_store1(0); break;
 241     case 8: __asan_report_store2(0); break;
 242     case 9: __asan_report_store4(0); break;
 243     case 10: __asan_report_store8(0); break;
 244     case 11: __asan_report_store16(0); break;
 245     case 12: __asan_report_store_n(0, 0); break;
 246     case 13: __asan_report_exp_load1(0, 0); break;
 247     case 14: __asan_report_exp_load2(0, 0); break;
 248     case 15: __asan_report_exp_load4(0, 0); break;
 249     case 16: __asan_report_exp_load8(0, 0); break;
 250     case 17: __asan_report_exp_load16(0, 0); break;
 251     case 18: __asan_report_exp_load_n(0, 0, 0); break;
 252     case 19: __asan_report_exp_store1(0, 0); break;
 253     case 20: __asan_report_exp_store2(0, 0); break;
 254     case 21: __asan_report_exp_store4(0, 0); break;
 255     case 22: __asan_report_exp_store8(0, 0); break;
 256     case 23: __asan_report_exp_store16(0, 0); break;
 257     case 24: __asan_report_exp_store_n(0, 0, 0); break;
 258     case 25: __asan_register_globals(nullptr, 0); break;
 259     case 26: __asan_unregister_globals(nullptr, 0); break;
 260     case 27: __asan_set_death_callback(nullptr); break;
 261     case 28: __asan_set_error_report_callback(nullptr); break;
 262     case 29: __asan_handle_no_return(); break;
 263     case 30: __asan_address_is_poisoned(nullptr); break;
 264     case 31: __asan_poison_memory_region(nullptr, 0); break;
 265     case 32: __asan_unpoison_memory_region(nullptr, 0); break;
 266     case 34: __asan_before_dynamic_init(nullptr); break;
 267     case 35: __asan_after_dynamic_init(); break;
 268     case 36: __asan_poison_stack_memory(0, 0); break;
 269     case 37: __asan_unpoison_stack_memory(0, 0); break;
 270     case 38: __asan_region_is_poisoned(0, 0); break;
 271     case 39: __asan_describe_address(0); break;
 272   }
 273 }
 274
 275 static void asan_atexit() {
 276   Printf("AddressSanitizer exit stats:\n");
 277   __asan_print_accumulated_stats();
 278   // Print AsanMappingProfile.
 279   for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
 280     if (AsanMappingProfile[i] == 0) continue;
 281     Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
 282   }
 283 }
 284
 285 static void InitializeHighMemEnd() {
 286 #if !ASAN_FIXED_MAPPING
 287   kHighMemEnd = GetMaxVirtualAddress();
 288   // Increase kHighMemEnd to make sure it's properly
 289   // aligned together with kHighMemBeg:
 290   kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1;
 291 #endif  // !ASAN_FIXED_MAPPING
 292   CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0);
 293 }
 294
 295 static void ProtectGap(uptr addr, uptr size) {
 296   void *res = MmapNoAccess(addr, size, "shadow gap");
 297   if (addr == (uptr)res)
 298     return;
 299   // A few pages at the start of the address space can not be protected.
 300   // But we really want to protect as much as possible, to prevent this memory
 301   // being returned as a result of a non-FIXED mmap().
 302   if (addr == kZeroBaseShadowStart) {
 303     uptr step = GetPageSizeCached();
 304     while (size > step && addr < kZeroBaseMaxShadowStart) {
 305       addr += step;
 306       size -= step;
 307       void *res = MmapNoAccess(addr, size, "shadow gap");
 308       if (addr == (uptr)res)
 309         return;
 310     }
 311   }
 312
 313   Report("ERROR: Failed to protect the shadow gap. "
 314          "ASan cannot proceed correctly. ABORTING.\n");
 315   DumpProcessMap();
 316   Die();
 317 }
 318
 319 static void PrintAddressSpaceLayout() {
 320   Printf("|| `[%p, %p]` || HighMem    ||\n",
 321          (void*)kHighMemBeg, (void*)kHighMemEnd);
 322   Printf("|| `[%p, %p]` || HighShadow ||\n",
 323          (void*)kHighShadowBeg, (void*)kHighShadowEnd);
 324   if (kMidMemBeg) {
 325     Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
 326            (void*)kShadowGap3Beg, (void*)kShadowGap3End);
 327     Printf("|| `[%p, %p]` || MidMem     ||\n",
 328            (void*)kMidMemBeg, (void*)kMidMemEnd);
 329     Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
 330            (void*)kShadowGap2Beg, (void*)kShadowGap2End);
 331     Printf("|| `[%p, %p]` || MidShadow  ||\n",
 332            (void*)kMidShadowBeg, (void*)kMidShadowEnd);
 333   }
 334   Printf("|| `[%p, %p]` || ShadowGap  ||\n",
 335          (void*)kShadowGapBeg, (void*)kShadowGapEnd);
 336   if (kLowShadowBeg) {
 337     Printf("|| `[%p, %p]` || LowShadow  ||\n",
 338            (void*)kLowShadowBeg, (void*)kLowShadowEnd);
 339     Printf("|| `[%p, %p]` || LowMem     ||\n",
 340            (void*)kLowMemBeg, (void*)kLowMemEnd);
 341   }
 342   Printf("MemToShadow(shadow): %p %p %p %p",
 343          (void*)MEM_TO_SHADOW(kLowShadowBeg),
 344          (void*)MEM_TO_SHADOW(kLowShadowEnd),
 345          (void*)MEM_TO_SHADOW(kHighShadowBeg),
 346          (void*)MEM_TO_SHADOW(kHighShadowEnd));
 347   if (kMidMemBeg) {
 348     Printf(" %p %p",
 349            (void*)MEM_TO_SHADOW(kMidShadowBeg),
 350            (void*)MEM_TO_SHADOW(kMidShadowEnd));
 351   }
 352   Printf("\n");
 353   Printf("redzone=%zu\n", (uptr)flags()->redzone);
 354   Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
 355   Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
 356   Printf("malloc_context_size=%zu\n",
 357          (uptr)common_flags()->malloc_context_size);
 358
 359   Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
 360   Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
 361   Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
 362   CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
 363   if (kMidMemBeg)
 364     CHECK(kMidShadowBeg > kLowShadowEnd &&
 365           kMidMemBeg > kMidShadowEnd &&
 366           kHighShadowBeg > kMidMemEnd);
 367 }
 368
 369 static void AsanInitInternal() {
 370   if (LIKELY(asan_inited)) return;
 371   SanitizerToolName = "AddressSanitizer";
 372   CHECK(!asan_init_is_running && "ASan init calls itself!");
 373   asan_init_is_running = true;
 374
 375   CacheBinaryName();
 376
 377   // Initialize flags. This must be done early, because most of the
 378   // initialization steps look at flags().
 379   InitializeFlags();
 380
 381   CheckVMASize();
 382
 383   AsanCheckIncompatibleRT();
 384   AsanCheckDynamicRTPrereqs();
 385
 386   SetCanPoisonMemory(flags()->poison_heap);
 387   SetMallocContextSize(common_flags()->malloc_context_size);
 388
 389   InitializeHighMemEnd();
 390
 391   // Make sure we are not statically linked.
 392   AsanDoesNotSupportStaticLinkage();
 393
 394   // Install tool-specific callbacks in sanitizer_common.
 395   AddDieCallback(AsanDie);
 396   SetCheckFailedCallback(AsanCheckFailed);
 397   SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
 398
 399   __sanitizer_set_report_path(common_flags()->log_path);
 400
 401   // Enable UAR detection, if required.
 402   __asan_option_detect_stack_use_after_return =
 403       flags()->detect_stack_use_after_return;
 404
 405   // Re-exec ourselves if we need to set additional env or command line args.
 406   MaybeReexec();
 407
 408   // Setup internal allocator callback.
 409   SetLowLevelAllocateCallback(OnLowLevelAllocate);
 410
 411   InitializeAsanInterceptors();
 412
 413   // Enable system log ("adb logcat") on Android.
 414   // Doing this before interceptors are initialized crashes in:
 415   // AsanInitInternal -> android_log_write -> __interceptor_strcmp
 416   AndroidLogInit();
 417
 418   ReplaceSystemMalloc();
 419
 420   uptr shadow_start = kLowShadowBeg;
 421   if (kLowShadowBeg)
 422     shadow_start -= GetMmapGranularity();
 423   bool full_shadow_is_available =
 424       MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
 425
 426 #if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) &&                \
 427     !ASAN_FIXED_MAPPING
 428   if (!full_shadow_is_available) {
 429     kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
 430     kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
 431   }
 432 #endif
 433
 434   if (Verbosity()) PrintAddressSpaceLayout();
 435
 436   DisableCoreDumperIfNecessary();
 437
 438   if (full_shadow_is_available) {
 439     // mmap the low shadow plus at least one page at the left.
 440     if (kLowShadowBeg)
 441       ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
 442     // mmap the high shadow.
 443     ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
 444     // protect the gap.
 445     ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
 446     CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1);
 447   } else if (kMidMemBeg &&
 448       MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
 449       MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
 450     CHECK(kLowShadowBeg != kLowShadowEnd);
 451     // mmap the low shadow plus at least one page at the left.
 452     ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
 453     // mmap the mid shadow.
 454     ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow");
 455     // mmap the high shadow.
 456     ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
 457     // protect the gaps.
 458     ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
 459     ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
 460     ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
 461   } else {
 462     Report("Shadow memory range interleaves with an existing memory mapping. "
 463            "ASan cannot proceed correctly. ABORTING.\n");
 464     Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
 465            shadow_start, kHighShadowEnd);
 466     DumpProcessMap();
 467     Die();
 468   }
 469
 470   AsanTSDInit(PlatformTSDDtor);
 471   InstallDeadlySignalHandlers(AsanOnDeadlySignal);
 472
 473   AllocatorOptions allocator_options;
 474   allocator_options.SetFrom(flags(), common_flags());
 475   InitializeAllocator(allocator_options);
 476
 477   MaybeStartBackgroudThread();
 478   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 479
 480   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
 481   // should be set to 1 prior to initializing the threads.
 482   asan_inited = 1;
 483   asan_init_is_running = false;
 484
 485   if (flags()->atexit)
 486     Atexit(asan_atexit);
 487
 488   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 489
 490   // Now that ASan runtime is (mostly) initialized, deactivate it if
 491   // necessary, so that it can be re-activated when requested.
 492   if (flags()->start_deactivated)
 493     AsanDeactivate();
 494
 495   // interceptors
 496   InitTlsSize();
 497
 498   // Create main thread.
 499   AsanThread *main_thread = AsanThread::Create(
 500       /* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0,
 501       /* stack */ nullptr, /* detached */ true);
 502   CHECK_EQ(0, main_thread->tid());
 503   SetCurrentThread(main_thread);
 504   main_thread->ThreadStart(internal_getpid(),
 505                            /* signal_thread_is_registered */ nullptr);
 506   force_interface_symbols();  // no-op.
 507   SanitizerInitializeUnwinder();
 508
 509 #if CAN_SANITIZE_LEAKS
 510   __lsan::InitCommonLsan();
 511   if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
 512     Atexit(__lsan::DoLeakCheck);
 513   }
 514 #endif  // CAN_SANITIZE_LEAKS
 515
 516 #if CAN_SANITIZE_UB
 517   __ubsan::InitAsPlugin();
 518 #endif
 519
 520   InitializeSuppressions();
 521
 522   VReport(1, "AddressSanitizer Init done\n");
 523 }
 524
 525 // Initialize as requested from some part of ASan runtime library (interceptors,
 526 // allocator, etc).
 527 void AsanInitFromRtl() {
 528   AsanInitInternal();
 529 }
 530
 531 #if ASAN_DYNAMIC
 532 // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
 533 // (and thus normal initializers from .preinit_array or modules haven't run).
 534
 535 class AsanInitializer {
 536 public:  // NOLINT
 537   AsanInitializer() {
 538     AsanInitFromRtl();
 539   }
 540 };
 541
 542 static AsanInitializer asan_initializer;
 543 #endif  // ASAN_DYNAMIC
 544
 545 } // namespace __asan
 546
 547 // ---------------------- Interface ---------------- {{{1
 548 using namespace __asan;  // NOLINT
 549
 550 void NOINLINE __asan_handle_no_return() {
 551   int local_stack;
 552   AsanThread *curr_thread = GetCurrentThread();
 553   uptr PageSize = GetPageSizeCached();
 554   uptr top, bottom;
 555   if (curr_thread) {
 556     top = curr_thread->stack_top();
 557     bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
 558   } else {
 559     // If we haven't seen this thread, try asking the OS for stack bounds.
 560     uptr tls_addr, tls_size, stack_size;
 561     GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
 562                          &tls_size);
 563     top = bottom + stack_size;
 564   }
 565   static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
 566   if (top - bottom > kMaxExpectedCleanupSize) {
 567     static bool reported_warning = false;
 568     if (reported_warning)
 569       return;
 570     reported_warning = true;
 571     Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
 572            "stack top: %p; bottom %p; size: %p (%zd)\n"
 573            "False positive error reports may follow\n"
 574            "For details see "
 575            "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n",
 576            top, bottom, top - bottom, top - bottom);
 577     return;
 578   }
 579   PoisonShadow(bottom, top - bottom, 0);
 580   if (curr_thread && curr_thread->has_fake_stack())
 581     curr_thread->fake_stack()->HandleNoReturn();
 582 }
 583
 584 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
 585   SetUserDieCallback(callback);
 586 }
 587
 588 // Initialize as requested from instrumented application code.
 589 // We use this call as a trigger to wake up ASan from deactivated state.
 590 void __asan_init() {
 591   AsanActivate();
 592   AsanInitInternal();
 593 }
 594
 595 void __asan_version_mismatch_check() {
 596   // Do nothing.
 597 }