asan_rtl.cc revision f882247088952deed954a19d745c2dd8871e2035 
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#include "asan_allocator.h"
15#include "asan_interceptors.h"
16#include "asan_internal.h"
17#include "asan_mapping.h"
18#include "asan_report.h"
19#include "asan_stack.h"
20#include "asan_stats.h"
21#include "asan_thread.h"
22#include "asan_thread_registry.h"
23#include "sanitizer_common/sanitizer_atomic.h"
24#include "sanitizer_common/sanitizer_flags.h"
25#include "sanitizer_common/sanitizer_libc.h"
26#include "sanitizer_common/sanitizer_symbolizer.h"
27
28namespace __asan {
29
30uptr AsanMappingProfile[kAsanMappingProfileSize];
31
32static void AsanDie() {
33  static atomic_uint32_t num_calls;
34  if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
35    // Don't die twice - run a busy loop.
36    while (1) { }
37  }
38  if (flags()->sleep_before_dying) {
39    Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
40    SleepForSeconds(flags()->sleep_before_dying);
41  }
42  if (flags()->unmap_shadow_on_exit) {
43    if (kMidMemBeg) {
44      UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
45      UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
46    } else {
47      UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
48    }
49  }
50  if (death_callback)
51    death_callback();
52  if (flags()->abort_on_error)
53    Abort();
54  internal__exit(flags()->exitcode);
55}
56
57static void AsanCheckFailed(const char *file, int line, const char *cond,
58                            u64 v1, u64 v2) {
59  Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n",
60             file, line, cond, (uptr)v1, (uptr)v2);
61  // FIXME: check for infinite recursion without a thread-local counter here.
62  PRINT_CURRENT_STACK();
63  Die();
64}
65
66// -------------------------- Flags ------------------------- {{{1
67static const int kDeafultMallocContextSize = 30;
68
69static Flags asan_flags;
70
71Flags *flags() {
72  return &asan_flags;
73}
74
75static const char *MaybeCallAsanDefaultOptions() {
76  return (&__asan_default_options) ? __asan_default_options() : "";
77}
78
79static const char *MaybeUseAsanDefaultOptionsCompileDefiniton() {
80#ifdef ASAN_DEFAULT_OPTIONS
81// Stringize the macro value.
82# define ASAN_STRINGIZE(x) #x
83# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
84  return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
85#else
86  return "";
87#endif
88}
89
90static void ParseFlagsFromString(Flags *f, const char *str) {
91  ParseFlag(str, &f->quarantine_size, "quarantine_size");
92  ParseFlag(str, &f->symbolize, "symbolize");
93  ParseFlag(str, &f->verbosity, "verbosity");
94  ParseFlag(str, &f->redzone, "redzone");
95  CHECK(f->redzone >= 16);
96  CHECK(IsPowerOfTwo(f->redzone));
97
98  ParseFlag(str, &f->debug, "debug");
99  ParseFlag(str, &f->report_globals, "report_globals");
100  ParseFlag(str, &f->check_initialization_order, "initialization_order");
101  ParseFlag(str, &f->malloc_context_size, "malloc_context_size");
102  CHECK((uptr)f->malloc_context_size <= kStackTraceMax);
103
104  ParseFlag(str, &f->replace_str, "replace_str");
105  ParseFlag(str, &f->replace_intrin, "replace_intrin");
106  ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free");
107  ParseFlag(str, &f->use_fake_stack, "use_fake_stack");
108  ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size");
109  ParseFlag(str, &f->exitcode, "exitcode");
110  ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning");
111  ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying");
112  ParseFlag(str, &f->handle_segv, "handle_segv");
113  ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack");
114  ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size");
115  ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit");
116  ParseFlag(str, &f->abort_on_error, "abort_on_error");
117  ParseFlag(str, &f->print_stats, "print_stats");
118  ParseFlag(str, &f->print_legend, "print_legend");
119  ParseFlag(str, &f->atexit, "atexit");
120  ParseFlag(str, &f->disable_core, "disable_core");
121  ParseFlag(str, &f->strip_path_prefix, "strip_path_prefix");
122  ParseFlag(str, &f->allow_reexec, "allow_reexec");
123  ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history");
124  ParseFlag(str, &f->log_path, "log_path");
125  ParseFlag(str, &f->fast_unwind_on_fatal, "fast_unwind_on_fatal");
126  ParseFlag(str, &f->fast_unwind_on_malloc, "fast_unwind_on_malloc");
127  ParseFlag(str, &f->poison_heap, "poison_heap");
128  ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch");
129  ParseFlag(str, &f->use_stack_depot, "use_stack_depot");
130}
131
132void InitializeFlags(Flags *f, const char *env) {
133  internal_memset(f, 0, sizeof(*f));
134
135  f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
136  f->symbolize = false;
137  f->verbosity = 0;
138  f->redzone = ASAN_ALLOCATOR_VERSION == 2 ? 16 : (ASAN_LOW_MEMORY) ? 64 : 128;
139  f->debug = false;
140  f->report_globals = 1;
141  f->check_initialization_order = true;
142  f->malloc_context_size = kDeafultMallocContextSize;
143  f->replace_str = true;
144  f->replace_intrin = true;
145  f->mac_ignore_invalid_free = false;
146  f->use_fake_stack = true;
147  f->max_malloc_fill_size = 0;
148  f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
149  f->allow_user_poisoning = true;
150  f->sleep_before_dying = 0;
151  f->handle_segv = ASAN_NEEDS_SEGV;
152  f->use_sigaltstack = false;
153  f->check_malloc_usable_size = true;
154  f->unmap_shadow_on_exit = false;
155  f->abort_on_error = false;
156  f->print_stats = false;
157  f->print_legend = true;
158  f->atexit = false;
159  f->disable_core = (SANITIZER_WORDSIZE == 64);
160  f->strip_path_prefix = "";
161  f->allow_reexec = true;
162  f->print_full_thread_history = true;
163  f->log_path = 0;
164  f->fast_unwind_on_fatal = false;
165  f->fast_unwind_on_malloc = true;
166  f->poison_heap = true;
167  f->alloc_dealloc_mismatch = true;
168  f->use_stack_depot = true;  // Only affects allocator2.
169
170  // Override from compile definition.
171  ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton());
172
173  // Override from user-specified string.
174  ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
175  if (flags()->verbosity) {
176    Report("Using the defaults from __asan_default_options: %s\n",
177           MaybeCallAsanDefaultOptions());
178  }
179
180  // Override from command line.
181  ParseFlagsFromString(f, env);
182}
183
184// -------------------------- Globals --------------------- {{{1
185int asan_inited;
186bool asan_init_is_running;
187void (*death_callback)(void);
188
189#if !ASAN_FIXED_MAPPING
190uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
191#endif
192
193// -------------------------- Misc ---------------- {{{1
194void ShowStatsAndAbort() {
195  __asan_print_accumulated_stats();
196  Die();
197}
198
199// ---------------------- mmap -------------------- {{{1
200// Reserve memory range [beg, end].
201static void ReserveShadowMemoryRange(uptr beg, uptr end) {
202  CHECK((beg % GetPageSizeCached()) == 0);
203  CHECK(((end + 1) % GetPageSizeCached()) == 0);
204  uptr size = end - beg + 1;
205  void *res = MmapFixedNoReserve(beg, size);
206  if (res != (void*)beg) {
207    Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
208           "Perhaps you're using ulimit -v\n", size);
209    Abort();
210  }
211}
212
213// --------------- LowLevelAllocateCallbac ---------- {{{1
214static void OnLowLevelAllocate(uptr ptr, uptr size) {
215  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
216}
217
218// -------------------------- Run-time entry ------------------- {{{1
219// exported functions
220#define ASAN_REPORT_ERROR(type, is_write, size)                     \
221extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
222void __asan_report_ ## type ## size(uptr addr);                \
223void __asan_report_ ## type ## size(uptr addr) {               \
224  GET_CALLER_PC_BP_SP;                                              \
225  __asan_report_error(pc, bp, sp, addr, is_write, size);            \
226}
227
228ASAN_REPORT_ERROR(load, false, 1)
229ASAN_REPORT_ERROR(load, false, 2)
230ASAN_REPORT_ERROR(load, false, 4)
231ASAN_REPORT_ERROR(load, false, 8)
232ASAN_REPORT_ERROR(load, false, 16)
233ASAN_REPORT_ERROR(store, true, 1)
234ASAN_REPORT_ERROR(store, true, 2)
235ASAN_REPORT_ERROR(store, true, 4)
236ASAN_REPORT_ERROR(store, true, 8)
237ASAN_REPORT_ERROR(store, true, 16)
238
239#define ASAN_REPORT_ERROR_N(type, is_write)                    \
240extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
241void __asan_report_ ## type ## _n(uptr addr, uptr size);       \
242void __asan_report_ ## type ## _n(uptr addr, uptr size) {      \
243  GET_CALLER_PC_BP_SP;                                         \
244  __asan_report_error(pc, bp, sp, addr, is_write, size);       \
245}
246
247ASAN_REPORT_ERROR_N(load, false)
248ASAN_REPORT_ERROR_N(store, true)
249
250// Force the linker to keep the symbols for various ASan interface functions.
251// We want to keep those in the executable in order to let the instrumented
252// dynamic libraries access the symbol even if it is not used by the executable
253// itself. This should help if the build system is removing dead code at link
254// time.
255static NOINLINE void force_interface_symbols() {
256  volatile int fake_condition = 0;  // prevent dead condition elimination.
257  // __asan_report_* functions are noreturn, so we need a switch to prevent
258  // the compiler from removing any of them.
259  switch (fake_condition) {
260    case 1: __asan_report_load1(0); break;
261    case 2: __asan_report_load2(0); break;
262    case 3: __asan_report_load4(0); break;
263    case 4: __asan_report_load8(0); break;
264    case 5: __asan_report_load16(0); break;
265    case 6: __asan_report_store1(0); break;
266    case 7: __asan_report_store2(0); break;
267    case 8: __asan_report_store4(0); break;
268    case 9: __asan_report_store8(0); break;
269    case 10: __asan_report_store16(0); break;
270    case 12: __asan_register_globals(0, 0); break;
271    case 13: __asan_unregister_globals(0, 0); break;
272    case 14: __asan_set_death_callback(0); break;
273    case 15: __asan_set_error_report_callback(0); break;
274    case 16: __asan_handle_no_return(); break;
275    case 17: __asan_address_is_poisoned(0); break;
276    case 18: __asan_get_allocated_size(0); break;
277    case 19: __asan_get_current_allocated_bytes(); break;
278    case 20: __asan_get_estimated_allocated_size(0); break;
279    case 21: __asan_get_free_bytes(); break;
280    case 22: __asan_get_heap_size(); break;
281    case 23: __asan_get_ownership(0); break;
282    case 24: __asan_get_unmapped_bytes(); break;
283    case 25: __asan_poison_memory_region(0, 0); break;
284    case 26: __asan_unpoison_memory_region(0, 0); break;
285    case 27: __asan_set_error_exit_code(0); break;
286    case 28: __asan_stack_free(0, 0, 0); break;
287    case 29: __asan_stack_malloc(0, 0); break;
288    case 30: __asan_before_dynamic_init(0, 0); break;
289    case 31: __asan_after_dynamic_init(); break;
290    case 32: __asan_poison_stack_memory(0, 0); break;
291    case 33: __asan_unpoison_stack_memory(0, 0); break;
292    case 34: __asan_region_is_poisoned(0, 0); break;
293    case 35: __asan_describe_address(0); break;
294  }
295}
296
297static void asan_atexit() {
298  Printf("AddressSanitizer exit stats:\n");
299  __asan_print_accumulated_stats();
300  // Print AsanMappingProfile.
301  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
302    if (AsanMappingProfile[i] == 0) continue;
303    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
304  }
305}
306
307static void InitializeHighMemEnd() {
308#if !ASAN_FIXED_MAPPING
309#if SANITIZER_WORDSIZE == 64
310# if defined(__powerpc64__)
311  // FIXME:
312  // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
313  // We somehow need to figure our which one we are using now and choose
314  // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
315  // Note that with 'ulimit -s unlimited' the stack is moved away from the top
316  // of the address space, so simply checking the stack address is not enough.
317  kHighMemEnd = (1ULL << 44) - 1;  // 0x00000fffffffffffUL
318# else
319  kHighMemEnd = (1ULL << 47) - 1;  // 0x00007fffffffffffUL;
320# endif
321#else  // SANITIZER_WORDSIZE == 32
322  kHighMemEnd = (1ULL << 32) - 1;  // 0xffffffff;
323#endif  // SANITIZER_WORDSIZE
324#endif  // !ASAN_FIXED_MAPPING
325}
326
327static void ProtectGap(uptr a, uptr size) {
328  CHECK_EQ(a, (uptr)Mprotect(a, size));
329}
330
331static void PrintAddressSpaceLayout() {
332  Printf("|| `[%p, %p]` || HighMem    ||\n",
333         (void*)kHighMemBeg, (void*)kHighMemEnd);
334  Printf("|| `[%p, %p]` || HighShadow ||\n",
335         (void*)kHighShadowBeg, (void*)kHighShadowEnd);
336  if (kMidMemBeg) {
337    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
338           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
339    Printf("|| `[%p, %p]` || MidMem     ||\n",
340           (void*)kMidMemBeg, (void*)kMidMemEnd);
341    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
342           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
343    Printf("|| `[%p, %p]` || MidShadow  ||\n",
344           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
345  }
346  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
347         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
348  if (kLowShadowBeg) {
349    Printf("|| `[%p, %p]` || LowShadow  ||\n",
350           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
351    Printf("|| `[%p, %p]` || LowMem     ||\n",
352           (void*)kLowMemBeg, (void*)kLowMemEnd);
353  }
354  Printf("MemToShadow(shadow): %p %p %p %p",
355         (void*)MEM_TO_SHADOW(kLowShadowBeg),
356         (void*)MEM_TO_SHADOW(kLowShadowEnd),
357         (void*)MEM_TO_SHADOW(kHighShadowBeg),
358         (void*)MEM_TO_SHADOW(kHighShadowEnd));
359  if (kMidMemBeg) {
360    Printf(" %p %p",
361           (void*)MEM_TO_SHADOW(kMidShadowBeg),
362           (void*)MEM_TO_SHADOW(kMidShadowEnd));
363  }
364  Printf("\n");
365  Printf("red_zone=%zu\n", (uptr)flags()->redzone);
366  Printf("malloc_context_size=%zu\n", (uptr)flags()->malloc_context_size);
367
368  Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE);
369  Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY);
370  Printf("SHADOW_OFFSET: %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}  // namespace __asan
379
380// ---------------------- Interface ---------------- {{{1
381using namespace __asan;  // NOLINT
382
383#if !SANITIZER_SUPPORTS_WEAK_HOOKS
384extern "C" {
385SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
386const char* __asan_default_options() { return ""; }
387}  // extern "C"
388#endif
389
390int NOINLINE __asan_set_error_exit_code(int exit_code) {
391  int old = flags()->exitcode;
392  flags()->exitcode = exit_code;
393  return old;
394}
395
396void NOINLINE __asan_handle_no_return() {
397  int local_stack;
398  AsanThread *curr_thread = asanThreadRegistry().GetCurrent();
399  CHECK(curr_thread);
400  uptr PageSize = GetPageSizeCached();
401  uptr top = curr_thread->stack_top();
402  uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1);
403  PoisonShadow(bottom, top - bottom, 0);
404}
405
406void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
407  death_callback = callback;
408}
409
410void __asan_init() {
411  if (asan_inited) return;
412  SanitizerToolName = "AddressSanitizer";
413  CHECK(!asan_init_is_running && "ASan init calls itself!");
414  asan_init_is_running = true;
415  InitializeHighMemEnd();
416
417  // Make sure we are not statically linked.
418  AsanDoesNotSupportStaticLinkage();
419
420  // Install tool-specific callbacks in sanitizer_common.
421  SetDieCallback(AsanDie);
422  SetCheckFailedCallback(AsanCheckFailed);
423  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
424
425  // Initialize flags. This must be done early, because most of the
426  // initialization steps look at flags().
427  const char *options = GetEnv("ASAN_OPTIONS");
428  InitializeFlags(flags(), options);
429  __sanitizer_set_report_path(flags()->log_path);
430
431  if (flags()->verbosity && options) {
432    Report("Parsed ASAN_OPTIONS: %s\n", options);
433  }
434
435  // Re-exec ourselves if we need to set additional env or command line args.
436  MaybeReexec();
437
438  // Setup internal allocator callback.
439  SetLowLevelAllocateCallback(OnLowLevelAllocate);
440
441  if (flags()->atexit) {
442    Atexit(asan_atexit);
443  }
444
445  // interceptors
446  InitializeAsanInterceptors();
447
448  ReplaceSystemMalloc();
449  ReplaceOperatorsNewAndDelete();
450
451  uptr shadow_start = kLowShadowBeg;
452  if (kLowShadowBeg) shadow_start -= GetMmapGranularity();
453  uptr shadow_end = kHighShadowEnd;
454  bool full_shadow_is_available =
455      MemoryRangeIsAvailable(shadow_start, shadow_end);
456
457#if ASAN_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING
458  if (!full_shadow_is_available) {
459    kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
460    kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x3fffffffffULL : 0;
461  }
462#endif
463
464  if (flags()->verbosity)
465    PrintAddressSpaceLayout();
466
467  if (flags()->disable_core) {
468    DisableCoreDumper();
469  }
470
471  if (full_shadow_is_available) {
472    // mmap the low shadow plus at least one page at the left.
473    if (kLowShadowBeg)
474      ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
475    // mmap the high shadow.
476    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
477    // protect the gap.
478    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
479  } else if (kMidMemBeg &&
480      MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
481      MemoryRangeIsAvailable(kMidMemEnd + 1, shadow_end)) {
482    CHECK(kLowShadowBeg != kLowShadowEnd);
483    // mmap the low shadow plus at least one page at the left.
484    ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
485    // mmap the mid shadow.
486    ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd);
487    // mmap the high shadow.
488    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
489    // protect the gaps.
490    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
491    ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
492    ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
493  } else {
494    Report("Shadow memory range interleaves with an existing memory mapping. "
495           "ASan cannot proceed correctly. ABORTING.\n");
496    DumpProcessMap();
497    Die();
498  }
499
500  InstallSignalHandlers();
501  // Start symbolizer process if necessary.
502  if (flags()->symbolize) {
503    const char *external_symbolizer = GetEnv("ASAN_SYMBOLIZER_PATH");
504    if (external_symbolizer) {
505      InitializeExternalSymbolizer(external_symbolizer);
506    }
507  }
508
509  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
510  // should be set to 1 prior to initializing the threads.
511  asan_inited = 1;
512  asan_init_is_running = false;
513
514  asanThreadRegistry().Init();
515  asanThreadRegistry().GetMain()->ThreadStart();
516  force_interface_symbols();  // no-op.
517
518  InitializeAllocator();
519
520  if (flags()->verbosity) {
521    Report("AddressSanitizer Init done\n");
522  }
523}
524
525#if defined(ASAN_USE_PREINIT_ARRAY)
526  // On Linux, we force __asan_init to be called before anyone else
527  // by placing it into .preinit_array section.
528  // FIXME: do we have anything like this on Mac?
529  __attribute__((section(".preinit_array")))
530    typeof(__asan_init) *__asan_preinit =__asan_init;
531#elif defined(_WIN32) && defined(_DLL)
532  // On Windows, when using dynamic CRT (/MD), we can put a pointer
533  // to __asan_init into the global list of C initializers.
534  // See crt0dat.c in the CRT sources for the details.
535  #pragma section(".CRT$XIB", long, read)  // NOLINT
536  __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init;
537#endif
538