diff options
Diffstat (limited to 'contrib/compiler-rt/lib/asan/asan_rtl.cc')
| -rw-r--r-- | contrib/compiler-rt/lib/asan/asan_rtl.cc | 648 |
1 files changed, 648 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/asan/asan_rtl.cc b/contrib/compiler-rt/lib/asan/asan_rtl.cc new file mode 100644 index 000000000000..4962b9ee1561 --- /dev/null +++ b/contrib/compiler-rt/lib/asan/asan_rtl.cc @@ -0,0 +1,648 @@ +//===-- 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 % GetMmapGranularity()), 0); + CHECK_EQ(((end + 1) % GetMmapGranularity()), 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 * GetMmapGranularity() - 1; +#endif // !ASAN_FIXED_MAPPING + CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0); +} + +static void ProtectGap(uptr addr, uptr size) { + if (!flags()->protect_shadow_gap) + return; + void *res = MmapFixedNoAccess(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 = GetMmapGranularity(); + while (size > step && addr < kZeroBaseMaxShadowStart) { + addr += step; + size -= step; + void *res = MmapFixedNoAccess(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(); + AvoidCVE_2016_2143(); + + SetCanPoisonMemory(flags()->poison_heap); + SetMallocContextSize(common_flags()->malloc_context_size); + + InitializePlatformExceptionHandlers(); + + 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; + } +#elif SANITIZER_WINDOWS64 + // Disable the "mid mem" shadow layout. + if (!full_shadow_is_available) { + kMidMemBeg = 0; + kMidMemEnd = 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); + } + } + +#if CAN_SANITIZE_UB + __ubsan::InitAsPlugin(); +#endif + + InitializeSuppressions(); + + if (CAN_SANITIZE_LEAKS) { + // LateInitialize() calls dlsym, which can allocate an error string buffer + // in the TLS. Let's ignore the allocation to avoid reporting a leak. + __lsan::ScopedInterceptorDisabler disabler; + Symbolizer::LateInitialize(); + } else { + Symbolizer::LateInitialize(); + } + + 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. +} |