| //===-- 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_allocator.h" |
| #include "asan_interceptors.h" |
| #include "asan_interface.h" |
| #include "asan_internal.h" |
| #include "asan_lock.h" |
| #include "asan_mapping.h" |
| #include "asan_stack.h" |
| #include "asan_stats.h" |
| #include "asan_thread.h" |
| #include "asan_thread_registry.h" |
| #include "sanitizer_common/sanitizer_atomic.h" |
| #include "sanitizer_common/sanitizer_flags.h" |
| #include "sanitizer_common/sanitizer_libc.h" |
| |
| namespace __sanitizer { |
| using namespace __asan; |
| |
| void Die() { |
| 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 %zd second(s)\n", flags()->sleep_before_dying); |
| SleepForSeconds(flags()->sleep_before_dying); |
| } |
| if (flags()->unmap_shadow_on_exit) |
| UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); |
| if (death_callback) |
| death_callback(); |
| if (flags()->abort_on_error) |
| Abort(); |
| Exit(flags()->exitcode); |
| } |
| |
| void CheckFailed(const char *file, int line, const char *cond, u64 v1, u64 v2) { |
| AsanReport("AddressSanitizer CHECK failed: %s:%d \"%s\" (%zx, %zx)\n", |
| file, line, cond, (uptr)v1, (uptr)v2); |
| PRINT_CURRENT_STACK(); |
| ShowStatsAndAbort(); |
| } |
| |
| } // namespace __sanitizer |
| |
| namespace __asan { |
| |
| // -------------------------- Flags ------------------------- {{{1 |
| static const uptr kMallocContextSize = 30; |
| |
| static Flags asan_flags; |
| |
| Flags *flags() { |
| return &asan_flags; |
| } |
| |
| // Can be overriden in frontend. |
| void WEAK OverrideFlags(Flags *f) { |
| (void)f; |
| } |
| |
| static void ParseFlagsFromString(Flags *f, const char *str) { |
| ParseFlag(str, &f->quarantine_size, "quarantine_size"); |
| ParseFlag(str, &f->symbolize, "symbolize"); |
| ParseFlag(str, &f->verbosity, "verbosity"); |
| ParseFlag(str, &f->redzone, "redzone"); |
| CHECK(f->redzone >= 16); |
| CHECK(IsPowerOfTwo(f->redzone)); |
| |
| ParseFlag(str, &f->debug, "debug"); |
| ParseFlag(str, &f->poison_shadow, "poison_shadow"); |
| ParseFlag(str, &f->report_globals, "report_globals"); |
| ParseFlag(str, &f->malloc_context_size, "malloc_context_size"); |
| CHECK(f->malloc_context_size <= kMallocContextSize); |
| |
| ParseFlag(str, &f->replace_str, "replace_str"); |
| ParseFlag(str, &f->replace_intrin, "replace_intrin"); |
| ParseFlag(str, &f->replace_cfallocator, "replace_cfallocator"); |
| ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free"); |
| ParseFlag(str, &f->use_fake_stack, "use_fake_stack"); |
| ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size"); |
| ParseFlag(str, &f->exitcode, "exitcode"); |
| ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning"); |
| ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying"); |
| ParseFlag(str, &f->handle_segv, "handle_segv"); |
| ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack"); |
| // Allow the users to work around the bug in Nvidia drivers prior to 295.*. |
| ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size"); |
| ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit"); |
| ParseFlag(str, &f->abort_on_error, "abort_on_error"); |
| ParseFlag(str, &f->atexit, "atexit"); |
| // By default, disable core dumper on 64-bit -- |
| // it makes little sense to dump 16T+ core. |
| ParseFlag(str, &f->disable_core, "disable_core"); |
| } |
| |
| void InitializeFlags(Flags *f, const char *env) { |
| internal_memset(f, 0, sizeof(*f)); |
| |
| f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 24 : 1UL << 28; |
| f->symbolize = false; |
| f->verbosity = 0; |
| f->redzone = (ASAN_LOW_MEMORY) ? 64 : 128; // power of two, >= 32. |
| f->debug = 0; |
| f->poison_shadow = true; |
| f->report_globals = 1; |
| f->malloc_context_size = kMallocContextSize; |
| f->replace_str = true; |
| f->replace_intrin = true; |
| f->replace_cfallocator = true; // Used on Mac only. |
| f->mac_ignore_invalid_free = false; // Used on Mac only. |
| f->use_fake_stack = true; |
| f->max_malloc_fill_size = 0; |
| f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; |
| f->allow_user_poisoning = true; |
| f->sleep_before_dying = 0; |
| f->handle_segv = ASAN_NEEDS_SEGV; |
| f->use_sigaltstack = false; |
| f->check_malloc_usable_size = true; |
| f->unmap_shadow_on_exit = false; |
| f->abort_on_error = false; |
| f->atexit = false; |
| f->disable_core = (__WORDSIZE == 64); |
| |
| // Let a frontend override. |
| OverrideFlags(f); |
| |
| // Override from user-specified string. |
| #if !defined(_WIN32) |
| if (__asan_default_options) { |
| ParseFlagsFromString(f, __asan_default_options); |
| if (flags()->verbosity) { |
| Report("Using the defaults from __asan_default_options: %s\n", |
| __asan_default_options); |
| } |
| } |
| #endif |
| |
| // Override from command line. |
| ParseFlagsFromString(f, env); |
| } |
| |
| // -------------------------- Globals --------------------- {{{1 |
| int asan_inited; |
| bool asan_init_is_running; |
| void (*death_callback)(void); |
| static void (*error_report_callback)(const char*); |
| char *error_message_buffer = 0; |
| uptr error_message_buffer_pos = 0; |
| uptr error_message_buffer_size = 0; |
| |
| // -------------------------- Misc ---------------- {{{1 |
| void ShowStatsAndAbort() { |
| __asan_print_accumulated_stats(); |
| Die(); |
| } |
| |
| static void PrintBytes(const char *before, uptr *a) { |
| u8 *bytes = (u8*)a; |
| uptr byte_num = (__WORDSIZE) / 8; |
| AsanPrintf("%s%p:", before, (void*)a); |
| for (uptr i = 0; i < byte_num; i++) { |
| AsanPrintf(" %x%x", bytes[i] >> 4, bytes[i] & 15); |
| } |
| AsanPrintf("\n"); |
| } |
| |
| void AppendToErrorMessageBuffer(const char *buffer) { |
| if (error_message_buffer) { |
| uptr length = internal_strlen(buffer); |
| CHECK_GE(error_message_buffer_size, error_message_buffer_pos); |
| uptr remaining = error_message_buffer_size - error_message_buffer_pos; |
| internal_strncpy(error_message_buffer + error_message_buffer_pos, |
| buffer, remaining); |
| error_message_buffer[error_message_buffer_size - 1] = '\0'; |
| // FIXME: reallocate the buffer instead of truncating the message. |
| error_message_buffer_pos += remaining > length ? length : remaining; |
| } |
| } |
| |
| // ---------------------- mmap -------------------- {{{1 |
| // Reserve memory range [beg, end]. |
| static void ReserveShadowMemoryRange(uptr beg, uptr end) { |
| CHECK((beg % kPageSize) == 0); |
| CHECK(((end + 1) % kPageSize) == 0); |
| uptr size = end - beg + 1; |
| void *res = MmapFixedNoReserve(beg, size); |
| CHECK(res == (void*)beg && "ReserveShadowMemoryRange failed"); |
| } |
| |
| // ---------------------- LowLevelAllocator ------------- {{{1 |
| void *LowLevelAllocator::Allocate(uptr size) { |
| CHECK((size & (size - 1)) == 0 && "size must be a power of two"); |
| if (allocated_end_ - allocated_current_ < (sptr)size) { |
| uptr size_to_allocate = Max(size, kPageSize); |
| allocated_current_ = |
| (char*)MmapOrDie(size_to_allocate, __FUNCTION__); |
| allocated_end_ = allocated_current_ + size_to_allocate; |
| PoisonShadow((uptr)allocated_current_, size_to_allocate, |
| kAsanInternalHeapMagic); |
| } |
| CHECK(allocated_end_ - allocated_current_ >= (sptr)size); |
| void *res = allocated_current_; |
| allocated_current_ += size; |
| return res; |
| } |
| |
| // ---------------------- DescribeAddress -------------------- {{{1 |
| static bool DescribeStackAddress(uptr addr, uptr access_size) { |
| AsanThread *t = asanThreadRegistry().FindThreadByStackAddress(addr); |
| if (!t) return false; |
| const sptr kBufSize = 4095; |
| char buf[kBufSize]; |
| uptr offset = 0; |
| const char *frame_descr = t->GetFrameNameByAddr(addr, &offset); |
| // This string is created by the compiler and has the following form: |
| // "FunctioName n alloc_1 alloc_2 ... alloc_n" |
| // where alloc_i looks like "offset size len ObjectName ". |
| CHECK(frame_descr); |
| // Report the function name and the offset. |
| const char *name_end = internal_strchr(frame_descr, ' '); |
| CHECK(name_end); |
| buf[0] = 0; |
| internal_strncat(buf, frame_descr, |
| Min(kBufSize, |
| static_cast<sptr>(name_end - frame_descr))); |
| AsanPrintf("Address %p is located at offset %zu " |
| "in frame <%s> of T%d's stack:\n", |
| (void*)addr, offset, buf, t->tid()); |
| // Report the number of stack objects. |
| char *p; |
| uptr n_objects = internal_simple_strtoll(name_end, &p, 10); |
| CHECK(n_objects > 0); |
| AsanPrintf(" This frame has %zu object(s):\n", n_objects); |
| // Report all objects in this frame. |
| for (uptr i = 0; i < n_objects; i++) { |
| uptr beg, size; |
| sptr len; |
| beg = internal_simple_strtoll(p, &p, 10); |
| size = internal_simple_strtoll(p, &p, 10); |
| len = internal_simple_strtoll(p, &p, 10); |
| if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { |
| AsanPrintf("AddressSanitizer can't parse the stack frame " |
| "descriptor: |%s|\n", frame_descr); |
| break; |
| } |
| p++; |
| buf[0] = 0; |
| internal_strncat(buf, p, Min(kBufSize, len)); |
| p += len; |
| AsanPrintf(" [%zu, %zu) '%s'\n", beg, beg + size, buf); |
| } |
| AsanPrintf("HINT: this may be a false positive if your program uses " |
| "some custom stack unwind mechanism\n" |
| " (longjmp and C++ exceptions *are* supported)\n"); |
| t->summary()->Announce(); |
| return true; |
| } |
| |
| static NOINLINE void DescribeAddress(uptr addr, uptr access_size) { |
| // Check if this is a global. |
| if (DescribeAddrIfGlobal(addr)) |
| return; |
| |
| if (DescribeStackAddress(addr, access_size)) |
| return; |
| |
| // finally, check if this is a heap. |
| DescribeHeapAddress(addr, access_size); |
| } |
| |
| // -------------------------- 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); \ |
| void __asan_report_ ## type ## size(uptr addr) { \ |
| GET_CALLER_PC_BP_SP; \ |
| __asan_report_error(pc, bp, sp, addr, is_write, size); \ |
| } |
| |
| 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) |
| |
| // 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. |
| if (fake_condition) { |
| __asan_report_load1(0); |
| __asan_report_load2(0); |
| __asan_report_load4(0); |
| __asan_report_load8(0); |
| __asan_report_load16(0); |
| __asan_report_store1(0); |
| __asan_report_store2(0); |
| __asan_report_store4(0); |
| __asan_report_store8(0); |
| __asan_report_store16(0); |
| __asan_register_global(0, 0, 0); |
| __asan_register_globals(0, 0); |
| __asan_unregister_globals(0, 0); |
| __asan_set_death_callback(0); |
| __asan_set_error_report_callback(0); |
| __asan_handle_no_return(); |
| } |
| } |
| |
| // -------------------------- Init ------------------- {{{1 |
| static void asan_atexit() { |
| AsanPrintf("AddressSanitizer exit stats:\n"); |
| __asan_print_accumulated_stats(); |
| } |
| |
| } // namespace __asan |
| |
| // ---------------------- Interface ---------------- {{{1 |
| using namespace __asan; // NOLINT |
| |
| int __asan_set_error_exit_code(int exit_code) { |
| int old = flags()->exitcode; |
| flags()->exitcode = exit_code; |
| return old; |
| } |
| |
| void NOINLINE __asan_handle_no_return() { |
| int local_stack; |
| AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); |
| CHECK(curr_thread); |
| uptr top = curr_thread->stack_top(); |
| uptr bottom = ((uptr)&local_stack - kPageSize) & ~(kPageSize-1); |
| PoisonShadow(bottom, top - bottom, 0); |
| } |
| |
| void NOINLINE __asan_set_death_callback(void (*callback)(void)) { |
| death_callback = callback; |
| } |
| |
| void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { |
| error_report_callback = callback; |
| if (callback) { |
| error_message_buffer_size = 1 << 16; |
| error_message_buffer = |
| (char*)MmapOrDie(error_message_buffer_size, __FUNCTION__); |
| error_message_buffer_pos = 0; |
| } |
| } |
| |
| void __asan_report_error(uptr pc, uptr bp, uptr sp, |
| uptr addr, bool is_write, uptr access_size) { |
| // Do not print more than one report, otherwise they will mix up. |
| static atomic_uint32_t num_calls; |
| if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) return; |
| |
| AsanPrintf("====================================================" |
| "=============\n"); |
| const char *bug_descr = "unknown-crash"; |
| if (AddrIsInMem(addr)) { |
| u8 *shadow_addr = (u8*)MemToShadow(addr); |
| // If we are accessing 16 bytes, look at the second shadow byte. |
| if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) |
| shadow_addr++; |
| // If we are in the partial right redzone, look at the next shadow byte. |
| if (*shadow_addr > 0 && *shadow_addr < 128) |
| shadow_addr++; |
| switch (*shadow_addr) { |
| case kAsanHeapLeftRedzoneMagic: |
| case kAsanHeapRightRedzoneMagic: |
| bug_descr = "heap-buffer-overflow"; |
| break; |
| case kAsanHeapFreeMagic: |
| bug_descr = "heap-use-after-free"; |
| break; |
| case kAsanStackLeftRedzoneMagic: |
| bug_descr = "stack-buffer-underflow"; |
| break; |
| case kAsanStackMidRedzoneMagic: |
| case kAsanStackRightRedzoneMagic: |
| case kAsanStackPartialRedzoneMagic: |
| bug_descr = "stack-buffer-overflow"; |
| break; |
| case kAsanStackAfterReturnMagic: |
| bug_descr = "stack-use-after-return"; |
| break; |
| case kAsanUserPoisonedMemoryMagic: |
| bug_descr = "use-after-poison"; |
| break; |
| case kAsanGlobalRedzoneMagic: |
| bug_descr = "global-buffer-overflow"; |
| break; |
| } |
| } |
| |
| AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); |
| u32 curr_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); |
| |
| if (curr_thread) { |
| // We started reporting an error message. Stop using the fake stack |
| // in case we will call an instrumented function from a symbolizer. |
| curr_thread->fake_stack().StopUsingFakeStack(); |
| } |
| |
| AsanReport("ERROR: AddressSanitizer %s on address " |
| "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", |
| bug_descr, (void*)addr, pc, bp, sp); |
| |
| AsanPrintf("%s of size %zu at %p thread T%d\n", |
| access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", |
| access_size, (void*)addr, curr_tid); |
| |
| if (flags()->debug) { |
| PrintBytes("PC: ", (uptr*)pc); |
| } |
| |
| GET_STACK_TRACE_WITH_PC_AND_BP(kStackTraceMax, pc, bp); |
| stack.PrintStack(); |
| |
| CHECK(AddrIsInMem(addr)); |
| |
| DescribeAddress(addr, access_size); |
| |
| uptr shadow_addr = MemToShadow(addr); |
| AsanReport("ABORTING\n"); |
| __asan_print_accumulated_stats(); |
| AsanPrintf("Shadow byte and word:\n"); |
| AsanPrintf(" %p: %x\n", (void*)shadow_addr, *(unsigned char*)shadow_addr); |
| uptr aligned_shadow = shadow_addr & ~(kWordSize - 1); |
| PrintBytes(" ", (uptr*)(aligned_shadow)); |
| AsanPrintf("More shadow bytes:\n"); |
| PrintBytes(" ", (uptr*)(aligned_shadow-4*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow-3*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow-2*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow-1*kWordSize)); |
| PrintBytes("=>", (uptr*)(aligned_shadow+0*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow+1*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow+2*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow+3*kWordSize)); |
| PrintBytes(" ", (uptr*)(aligned_shadow+4*kWordSize)); |
| if (error_report_callback) { |
| error_report_callback(error_message_buffer); |
| } |
| Die(); |
| } |
| |
| |
| void __asan_init() { |
| if (asan_inited) return; |
| asan_init_is_running = true; |
| |
| // Make sure we are not statically linked. |
| AsanDoesNotSupportStaticLinkage(); |
| |
| // Initialize flags. |
| const char *options = GetEnv("ASAN_OPTIONS"); |
| InitializeFlags(flags(), options); |
| |
| if (flags()->verbosity && options) { |
| Report("Parsed ASAN_OPTIONS: %s\n", options); |
| } |
| |
| if (flags()->atexit) { |
| Atexit(asan_atexit); |
| } |
| |
| // interceptors |
| InitializeAsanInterceptors(); |
| |
| ReplaceSystemMalloc(); |
| ReplaceOperatorsNewAndDelete(); |
| |
| if (flags()->verbosity) { |
| Printf("|| `[%p, %p]` || HighMem ||\n", |
| (void*)kHighMemBeg, (void*)kHighMemEnd); |
| Printf("|| `[%p, %p]` || HighShadow ||\n", |
| (void*)kHighShadowBeg, (void*)kHighShadowEnd); |
| Printf("|| `[%p, %p]` || ShadowGap ||\n", |
| (void*)kShadowGapBeg, (void*)kShadowGapEnd); |
| 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\n", |
| (void*)MEM_TO_SHADOW(kLowShadowBeg), |
| (void*)MEM_TO_SHADOW(kLowShadowEnd), |
| (void*)MEM_TO_SHADOW(kHighShadowBeg), |
| (void*)MEM_TO_SHADOW(kHighShadowEnd)); |
| Printf("red_zone=%zu\n", (uptr)flags()->redzone); |
| Printf("malloc_context_size=%zu\n", (uptr)flags()->malloc_context_size); |
| |
| Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); |
| Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); |
| Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); |
| CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); |
| } |
| |
| if (flags()->disable_core) { |
| DisableCoreDumper(); |
| } |
| |
| uptr shadow_start = kLowShadowBeg; |
| if (kLowShadowBeg > 0) shadow_start -= kMmapGranularity; |
| uptr shadow_end = kHighShadowEnd; |
| if (MemoryRangeIsAvailable(shadow_start, shadow_end)) { |
| if (kLowShadowBeg != kLowShadowEnd) { |
| // mmap the low shadow plus at least one page. |
| ReserveShadowMemoryRange(kLowShadowBeg - kMmapGranularity, kLowShadowEnd); |
| } |
| // mmap the high shadow. |
| ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); |
| // protect the gap |
| void *prot = Mprotect(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); |
| CHECK(prot == (void*)kShadowGapBeg); |
| } else { |
| Report("Shadow memory range interleaves with an existing memory mapping. " |
| "ASan cannot proceed correctly. ABORTING.\n"); |
| DumpProcessMap(); |
| Die(); |
| } |
| |
| InstallSignalHandlers(); |
| |
| // 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; |
| |
| asanThreadRegistry().Init(); |
| asanThreadRegistry().GetMain()->ThreadStart(); |
| force_interface_symbols(); // no-op. |
| |
| if (flags()->verbosity) { |
| Report("AddressSanitizer Init done\n"); |
| } |
| } |
| |
| #if defined(ASAN_USE_PREINIT_ARRAY) |
| // On Linux, we force __asan_init to be called before anyone else |
| // by placing it into .preinit_array section. |
| // FIXME: do we have anything like this on Mac? |
| __attribute__((section(".preinit_array"))) |
| typeof(__asan_init) *__asan_preinit =__asan_init; |
| #elif defined(_WIN32) && defined(_DLL) |
| // On Windows, when using dynamic CRT (/MD), we can put a pointer |
| // to __asan_init into the global list of C initializers. |
| // See crt0dat.c in the CRT sources for the details. |
| #pragma section(".CRT$XIB", long, read) // NOLINT |
| __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init; |
| #endif |