| //===-- asan_rtl.cc -------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of AddressSanitizer, an address sanity checker. |
| // |
| // Main file of the ASan run-time library. |
| //===----------------------------------------------------------------------===// |
| |
| #include "asan_activation.h" |
| #include "asan_allocator.h" |
| #include "asan_interceptors.h" |
| #include "asan_interface_internal.h" |
| #include "asan_internal.h" |
| #include "asan_mapping.h" |
| #include "asan_poisoning.h" |
| #include "asan_report.h" |
| #include "asan_stack.h" |
| #include "asan_stats.h" |
| #include "asan_suppressions.h" |
| #include "asan_thread.h" |
| #include "sanitizer_common/sanitizer_atomic.h" |
| #include "sanitizer_common/sanitizer_flags.h" |
| #include "sanitizer_common/sanitizer_libc.h" |
| #include "sanitizer_common/sanitizer_symbolizer.h" |
| #include "lsan/lsan_common.h" |
| #include "ubsan/ubsan_init.h" |
| #include "ubsan/ubsan_platform.h" |
| |
| int __asan_option_detect_stack_use_after_return; // Global interface symbol. |
| uptr *__asan_test_only_reported_buggy_pointer; // Used only for testing asan. |
| |
| namespace __asan { |
| |
| uptr AsanMappingProfile[kAsanMappingProfileSize]; |
| |
| static void AsanDie() { |
| static atomic_uint32_t num_calls; |
| if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { |
| // Don't die twice - run a busy loop. |
| while (1) { } |
| } |
| if (flags()->sleep_before_dying) { |
| Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); |
| SleepForSeconds(flags()->sleep_before_dying); |
| } |
| if (flags()->unmap_shadow_on_exit) { |
| if (kMidMemBeg) { |
| UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); |
| UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); |
| } else { |
| UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); |
| } |
| } |
| } |
| |
| static void AsanCheckFailed(const char *file, int line, const char *cond, |
| u64 v1, u64 v2) { |
| Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file, |
| line, cond, (uptr)v1, (uptr)v2); |
| // FIXME: check for infinite recursion without a thread-local counter here. |
| PRINT_CURRENT_STACK_CHECK(); |
| Die(); |
| } |
| |
| // -------------------------- Globals --------------------- {{{1 |
| int asan_inited; |
| bool asan_init_is_running; |
| |
| #if !ASAN_FIXED_MAPPING |
| uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; |
| #endif |
| |
| // -------------------------- Misc ---------------- {{{1 |
| void ShowStatsAndAbort() { |
| __asan_print_accumulated_stats(); |
| Die(); |
| } |
| |
| // ---------------------- mmap -------------------- {{{1 |
| // Reserve memory range [beg, end]. |
| // We need to use inclusive range because end+1 may not be representable. |
| void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) { |
| CHECK_EQ((beg % GetPageSizeCached()), 0); |
| CHECK_EQ(((end + 1) % GetPageSizeCached()), 0); |
| uptr size = end - beg + 1; |
| DecreaseTotalMmap(size); // Don't count the shadow against mmap_limit_mb. |
| void *res = MmapFixedNoReserve(beg, size, name); |
| if (res != (void*)beg) { |
| Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " |
| "Perhaps you're using ulimit -v\n", size); |
| Abort(); |
| } |
| if (common_flags()->no_huge_pages_for_shadow) |
| NoHugePagesInRegion(beg, size); |
| if (common_flags()->use_madv_dontdump) |
| DontDumpShadowMemory(beg, size); |
| } |
| |
| // --------------- LowLevelAllocateCallbac ---------- {{{1 |
| static void OnLowLevelAllocate(uptr ptr, uptr size) { |
| PoisonShadow(ptr, size, kAsanInternalHeapMagic); |
| } |
| |
| // -------------------------- Run-time entry ------------------- {{{1 |
| // exported functions |
| #define ASAN_REPORT_ERROR(type, is_write, size) \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_ ## type ## size(uptr addr) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_ ## type ## size ## _noabort(uptr addr) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \ |
| } \ |
| |
| ASAN_REPORT_ERROR(load, false, 1) |
| ASAN_REPORT_ERROR(load, false, 2) |
| ASAN_REPORT_ERROR(load, false, 4) |
| ASAN_REPORT_ERROR(load, false, 8) |
| ASAN_REPORT_ERROR(load, false, 16) |
| ASAN_REPORT_ERROR(store, true, 1) |
| ASAN_REPORT_ERROR(store, true, 2) |
| ASAN_REPORT_ERROR(store, true, 4) |
| ASAN_REPORT_ERROR(store, true, 8) |
| ASAN_REPORT_ERROR(store, true, 16) |
| |
| #define ASAN_REPORT_ERROR_N(type, is_write) \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \ |
| } \ |
| |
| ASAN_REPORT_ERROR_N(load, false) |
| ASAN_REPORT_ERROR_N(store, true) |
| |
| #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \ |
| uptr sp = MEM_TO_SHADOW(addr); \ |
| uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp) \ |
| : *reinterpret_cast<u16 *>(sp); \ |
| if (UNLIKELY(s)) { \ |
| if (UNLIKELY(size >= SHADOW_GRANULARITY || \ |
| ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >= \ |
| (s8)s)) { \ |
| if (__asan_test_only_reported_buggy_pointer) { \ |
| *__asan_test_only_reported_buggy_pointer = addr; \ |
| } else { \ |
| GET_CALLER_PC_BP_SP; \ |
| ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, \ |
| fatal); \ |
| } \ |
| } \ |
| } |
| |
| #define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size) \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_##type##size(uptr addr) { \ |
| ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true) \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_exp_##type##size(uptr addr, u32 exp) { \ |
| ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true) \ |
| } \ |
| extern "C" NOINLINE INTERFACE_ATTRIBUTE \ |
| void __asan_##type##size ## _noabort(uptr addr) { \ |
| ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false) \ |
| } \ |
| |
| ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1) |
| ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2) |
| ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4) |
| ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8) |
| ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16) |
| ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1) |
| ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2) |
| ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4) |
| ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8) |
| ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16) |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_loadN(uptr addr, uptr size) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, false, size, 0, true); |
| } |
| } |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_exp_loadN(uptr addr, uptr size, u32 exp) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, false, size, exp, true); |
| } |
| } |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_loadN_noabort(uptr addr, uptr size) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, false, size, 0, false); |
| } |
| } |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_storeN(uptr addr, uptr size) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, true, size, 0, true); |
| } |
| } |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_exp_storeN(uptr addr, uptr size, u32 exp) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, true, size, exp, true); |
| } |
| } |
| |
| extern "C" |
| NOINLINE INTERFACE_ATTRIBUTE |
| void __asan_storeN_noabort(uptr addr, uptr size) { |
| if (__asan_region_is_poisoned(addr, size)) { |
| GET_CALLER_PC_BP_SP; |
| ReportGenericError(pc, bp, sp, addr, true, size, 0, false); |
| } |
| } |
| |
| // Force the linker to keep the symbols for various ASan interface functions. |
| // We want to keep those in the executable in order to let the instrumented |
| // dynamic libraries access the symbol even if it is not used by the executable |
| // itself. This should help if the build system is removing dead code at link |
| // time. |
| static NOINLINE void force_interface_symbols() { |
| volatile int fake_condition = 0; // prevent dead condition elimination. |
| // __asan_report_* functions are noreturn, so we need a switch to prevent |
| // the compiler from removing any of them. |
| switch (fake_condition) { |
| case 1: __asan_report_load1(0); break; |
| case 2: __asan_report_load2(0); break; |
| case 3: __asan_report_load4(0); break; |
| case 4: __asan_report_load8(0); break; |
| case 5: __asan_report_load16(0); break; |
| case 6: __asan_report_load_n(0, 0); break; |
| case 7: __asan_report_store1(0); break; |
| case 8: __asan_report_store2(0); break; |
| case 9: __asan_report_store4(0); break; |
| case 10: __asan_report_store8(0); break; |
| case 11: __asan_report_store16(0); break; |
| case 12: __asan_report_store_n(0, 0); break; |
| case 13: __asan_report_exp_load1(0, 0); break; |
| case 14: __asan_report_exp_load2(0, 0); break; |
| case 15: __asan_report_exp_load4(0, 0); break; |
| case 16: __asan_report_exp_load8(0, 0); break; |
| case 17: __asan_report_exp_load16(0, 0); break; |
| case 18: __asan_report_exp_load_n(0, 0, 0); break; |
| case 19: __asan_report_exp_store1(0, 0); break; |
| case 20: __asan_report_exp_store2(0, 0); break; |
| case 21: __asan_report_exp_store4(0, 0); break; |
| case 22: __asan_report_exp_store8(0, 0); break; |
| case 23: __asan_report_exp_store16(0, 0); break; |
| case 24: __asan_report_exp_store_n(0, 0, 0); break; |
| case 25: __asan_register_globals(nullptr, 0); break; |
| case 26: __asan_unregister_globals(nullptr, 0); break; |
| case 27: __asan_set_death_callback(nullptr); break; |
| case 28: __asan_set_error_report_callback(nullptr); break; |
| case 29: __asan_handle_no_return(); break; |
| case 30: __asan_address_is_poisoned(nullptr); break; |
| case 31: __asan_poison_memory_region(nullptr, 0); break; |
| case 32: __asan_unpoison_memory_region(nullptr, 0); break; |
| case 34: __asan_before_dynamic_init(nullptr); break; |
| case 35: __asan_after_dynamic_init(); break; |
| case 36: __asan_poison_stack_memory(0, 0); break; |
| case 37: __asan_unpoison_stack_memory(0, 0); break; |
| case 38: __asan_region_is_poisoned(0, 0); break; |
| case 39: __asan_describe_address(0); break; |
| } |
| } |
| |
| static void asan_atexit() { |
| Printf("AddressSanitizer exit stats:\n"); |
| __asan_print_accumulated_stats(); |
| // Print AsanMappingProfile. |
| for (uptr i = 0; i < kAsanMappingProfileSize; i++) { |
| if (AsanMappingProfile[i] == 0) continue; |
| Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); |
| } |
| } |
| |
| static void InitializeHighMemEnd() { |
| #if !ASAN_FIXED_MAPPING |
| kHighMemEnd = GetMaxVirtualAddress(); |
| // Increase kHighMemEnd to make sure it's properly |
| // aligned together with kHighMemBeg: |
| kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1; |
| #endif // !ASAN_FIXED_MAPPING |
| CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0); |
| } |
| |
| static void ProtectGap(uptr addr, uptr size) { |
| if (!flags()->protect_shadow_gap) |
| return; |
| void *res = MmapNoAccess(addr, size, "shadow gap"); |
| if (addr == (uptr)res) |
| return; |
| // A few pages at the start of the address space can not be protected. |
| // But we really want to protect as much as possible, to prevent this memory |
| // being returned as a result of a non-FIXED mmap(). |
| if (addr == kZeroBaseShadowStart) { |
| uptr step = GetPageSizeCached(); |
| while (size > step && addr < kZeroBaseMaxShadowStart) { |
| addr += step; |
| size -= step; |
| void *res = MmapNoAccess(addr, size, "shadow gap"); |
| if (addr == (uptr)res) |
| return; |
| } |
| } |
| |
| Report("ERROR: Failed to protect the shadow gap. " |
| "ASan cannot proceed correctly. ABORTING.\n"); |
| DumpProcessMap(); |
| Die(); |
| } |
| |
| static void PrintAddressSpaceLayout() { |
| Printf("|| `[%p, %p]` || HighMem ||\n", |
| (void*)kHighMemBeg, (void*)kHighMemEnd); |
| Printf("|| `[%p, %p]` || HighShadow ||\n", |
| (void*)kHighShadowBeg, (void*)kHighShadowEnd); |
| if (kMidMemBeg) { |
| Printf("|| `[%p, %p]` || ShadowGap3 ||\n", |
| (void*)kShadowGap3Beg, (void*)kShadowGap3End); |
| Printf("|| `[%p, %p]` || MidMem ||\n", |
| (void*)kMidMemBeg, (void*)kMidMemEnd); |
| Printf("|| `[%p, %p]` || ShadowGap2 ||\n", |
| (void*)kShadowGap2Beg, (void*)kShadowGap2End); |
| Printf("|| `[%p, %p]` || MidShadow ||\n", |
| (void*)kMidShadowBeg, (void*)kMidShadowEnd); |
| } |
| Printf("|| `[%p, %p]` || ShadowGap ||\n", |
| (void*)kShadowGapBeg, (void*)kShadowGapEnd); |
| if (kLowShadowBeg) { |
| Printf("|| `[%p, %p]` || LowShadow ||\n", |
| (void*)kLowShadowBeg, (void*)kLowShadowEnd); |
| Printf("|| `[%p, %p]` || LowMem ||\n", |
| (void*)kLowMemBeg, (void*)kLowMemEnd); |
| } |
| Printf("MemToShadow(shadow): %p %p %p %p", |
| (void*)MEM_TO_SHADOW(kLowShadowBeg), |
| (void*)MEM_TO_SHADOW(kLowShadowEnd), |
| (void*)MEM_TO_SHADOW(kHighShadowBeg), |
| (void*)MEM_TO_SHADOW(kHighShadowEnd)); |
| if (kMidMemBeg) { |
| Printf(" %p %p", |
| (void*)MEM_TO_SHADOW(kMidShadowBeg), |
| (void*)MEM_TO_SHADOW(kMidShadowEnd)); |
| } |
| Printf("\n"); |
| Printf("redzone=%zu\n", (uptr)flags()->redzone); |
| Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone); |
| Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb); |
| Printf("malloc_context_size=%zu\n", |
| (uptr)common_flags()->malloc_context_size); |
| |
| Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE); |
| Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY); |
| Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET); |
| CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); |
| if (kMidMemBeg) |
| CHECK(kMidShadowBeg > kLowShadowEnd && |
| kMidMemBeg > kMidShadowEnd && |
| kHighShadowBeg > kMidMemEnd); |
| } |
| |
| static void AsanInitInternal() { |
| if (LIKELY(asan_inited)) return; |
| SanitizerToolName = "AddressSanitizer"; |
| CHECK(!asan_init_is_running && "ASan init calls itself!"); |
| asan_init_is_running = true; |
| |
| CacheBinaryName(); |
| |
| // Initialize flags. This must be done early, because most of the |
| // initialization steps look at flags(). |
| InitializeFlags(); |
| |
| AsanCheckIncompatibleRT(); |
| AsanCheckDynamicRTPrereqs(); |
| |
| SetCanPoisonMemory(flags()->poison_heap); |
| SetMallocContextSize(common_flags()->malloc_context_size); |
| |
| InitializeHighMemEnd(); |
| |
| // Make sure we are not statically linked. |
| AsanDoesNotSupportStaticLinkage(); |
| |
| // Install tool-specific callbacks in sanitizer_common. |
| AddDieCallback(AsanDie); |
| SetCheckFailedCallback(AsanCheckFailed); |
| SetPrintfAndReportCallback(AppendToErrorMessageBuffer); |
| |
| __sanitizer_set_report_path(common_flags()->log_path); |
| |
| // Enable UAR detection, if required. |
| __asan_option_detect_stack_use_after_return = |
| flags()->detect_stack_use_after_return; |
| |
| // Re-exec ourselves if we need to set additional env or command line args. |
| MaybeReexec(); |
| |
| // Setup internal allocator callback. |
| SetLowLevelAllocateCallback(OnLowLevelAllocate); |
| |
| InitializeAsanInterceptors(); |
| |
| // Enable system log ("adb logcat") on Android. |
| // Doing this before interceptors are initialized crashes in: |
| // AsanInitInternal -> android_log_write -> __interceptor_strcmp |
| AndroidLogInit(); |
| |
| ReplaceSystemMalloc(); |
| |
| uptr shadow_start = kLowShadowBeg; |
| if (kLowShadowBeg) |
| shadow_start -= GetMmapGranularity(); |
| bool full_shadow_is_available = |
| MemoryRangeIsAvailable(shadow_start, kHighShadowEnd); |
| |
| #if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) && \ |
| !ASAN_FIXED_MAPPING |
| if (!full_shadow_is_available) { |
| kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; |
| kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; |
| } |
| #endif |
| |
| if (Verbosity()) PrintAddressSpaceLayout(); |
| |
| DisableCoreDumperIfNecessary(); |
| |
| if (full_shadow_is_available) { |
| // mmap the low shadow plus at least one page at the left. |
| if (kLowShadowBeg) |
| ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow"); |
| // mmap the high shadow. |
| ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow"); |
| // protect the gap. |
| ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); |
| CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1); |
| } else if (kMidMemBeg && |
| MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && |
| MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) { |
| CHECK(kLowShadowBeg != kLowShadowEnd); |
| // mmap the low shadow plus at least one page at the left. |
| ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow"); |
| // mmap the mid shadow. |
| ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow"); |
| // mmap the high shadow. |
| ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow"); |
| // protect the gaps. |
| ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); |
| ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); |
| ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); |
| } else { |
| Report("Shadow memory range interleaves with an existing memory mapping. " |
| "ASan cannot proceed correctly. ABORTING.\n"); |
| Report("ASan shadow was supposed to be located in the [%p-%p] range.\n", |
| shadow_start, kHighShadowEnd); |
| DumpProcessMap(); |
| Die(); |
| } |
| |
| AsanTSDInit(PlatformTSDDtor); |
| InstallDeadlySignalHandlers(AsanOnDeadlySignal); |
| |
| AllocatorOptions allocator_options; |
| allocator_options.SetFrom(flags(), common_flags()); |
| InitializeAllocator(allocator_options); |
| |
| MaybeStartBackgroudThread(); |
| SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback); |
| |
| // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited |
| // should be set to 1 prior to initializing the threads. |
| asan_inited = 1; |
| asan_init_is_running = false; |
| |
| if (flags()->atexit) |
| Atexit(asan_atexit); |
| |
| InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir); |
| |
| // Now that ASan runtime is (mostly) initialized, deactivate it if |
| // necessary, so that it can be re-activated when requested. |
| if (flags()->start_deactivated) |
| AsanDeactivate(); |
| |
| // interceptors |
| InitTlsSize(); |
| |
| // Create main thread. |
| AsanThread *main_thread = AsanThread::Create( |
| /* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0, |
| /* stack */ nullptr, /* detached */ true); |
| CHECK_EQ(0, main_thread->tid()); |
| SetCurrentThread(main_thread); |
| main_thread->ThreadStart(internal_getpid(), |
| /* signal_thread_is_registered */ nullptr); |
| force_interface_symbols(); // no-op. |
| SanitizerInitializeUnwinder(); |
| |
| #if CAN_SANITIZE_LEAKS |
| __lsan::InitCommonLsan(); |
| if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) { |
| Atexit(__lsan::DoLeakCheck); |
| } |
| #endif // CAN_SANITIZE_LEAKS |
| |
| #if CAN_SANITIZE_UB |
| __ubsan::InitAsPlugin(); |
| #endif |
| |
| InitializeSuppressions(); |
| |
| VReport(1, "AddressSanitizer Init done\n"); |
| } |
| |
| // Initialize as requested from some part of ASan runtime library (interceptors, |
| // allocator, etc). |
| void AsanInitFromRtl() { |
| AsanInitInternal(); |
| } |
| |
| #if ASAN_DYNAMIC |
| // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable |
| // (and thus normal initializers from .preinit_array or modules haven't run). |
| |
| class AsanInitializer { |
| public: // NOLINT |
| AsanInitializer() { |
| AsanInitFromRtl(); |
| } |
| }; |
| |
| static AsanInitializer asan_initializer; |
| #endif // ASAN_DYNAMIC |
| |
| } // namespace __asan |
| |
| // ---------------------- Interface ---------------- {{{1 |
| using namespace __asan; // NOLINT |
| |
| void NOINLINE __asan_handle_no_return() { |
| int local_stack; |
| AsanThread *curr_thread = GetCurrentThread(); |
| uptr PageSize = GetPageSizeCached(); |
| uptr top, bottom; |
| if (curr_thread) { |
| top = curr_thread->stack_top(); |
| bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1); |
| } else { |
| // If we haven't seen this thread, try asking the OS for stack bounds. |
| uptr tls_addr, tls_size, stack_size; |
| GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr, |
| &tls_size); |
| top = bottom + stack_size; |
| } |
| static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M |
| if (top - bottom > kMaxExpectedCleanupSize) { |
| static bool reported_warning = false; |
| if (reported_warning) |
| return; |
| reported_warning = true; |
| Report("WARNING: ASan is ignoring requested __asan_handle_no_return: " |
| "stack top: %p; bottom %p; size: %p (%zd)\n" |
| "False positive error reports may follow\n" |
| "For details see " |
| "https://github.com/google/sanitizers/issues/189\n", |
| top, bottom, top - bottom, top - bottom); |
| return; |
| } |
| PoisonShadow(bottom, top - bottom, 0); |
| if (curr_thread && curr_thread->has_fake_stack()) |
| curr_thread->fake_stack()->HandleNoReturn(); |
| } |
| |
| void NOINLINE __asan_set_death_callback(void (*callback)(void)) { |
| SetUserDieCallback(callback); |
| } |
| |
| // Initialize as requested from instrumented application code. |
| // We use this call as a trigger to wake up ASan from deactivated state. |
| void __asan_init() { |
| AsanActivate(); |
| AsanInitInternal(); |
| } |
| |
| void __asan_version_mismatch_check() { |
| // Do nothing. |
| } |
