asan_rtl.cc revision b1971ca4a3057916ca90a733c672a08127d5fe67 
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_poisoning.h"
19#include "asan_report.h"
20#include "asan_stack.h"
21#include "asan_stats.h"
22#include "asan_thread.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, "check_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->malloc_fill_byte, "malloc_fill_byte");
110  ParseFlag(str, &f->exitcode, "exitcode");
111  ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning");
112  ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying");
113  ParseFlag(str, &f->handle_segv, "handle_segv");
114  ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack");
115  ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size");
116  ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit");
117  ParseFlag(str, &f->abort_on_error, "abort_on_error");
118  ParseFlag(str, &f->print_stats, "print_stats");
119  ParseFlag(str, &f->print_legend, "print_legend");
120  ParseFlag(str, &f->atexit, "atexit");
121  ParseFlag(str, &f->disable_core, "disable_core");
122  ParseFlag(str, &f->strip_path_prefix, "strip_path_prefix");
123  ParseFlag(str, &f->allow_reexec, "allow_reexec");
124  ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history");
125  ParseFlag(str, &f->log_path, "log_path");
126  ParseFlag(str, &f->fast_unwind_on_fatal, "fast_unwind_on_fatal");
127  ParseFlag(str, &f->fast_unwind_on_malloc, "fast_unwind_on_malloc");
128  ParseFlag(str, &f->poison_heap, "poison_heap");
129  ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch");
130  ParseFlag(str, &f->use_stack_depot, "use_stack_depot");
131  ParseFlag(str, &f->strict_memcmp, "strict_memcmp");
132}
133
134static const char *asan_external_symbolizer;
135
136void InitializeFlags(Flags *f, const char *env) {
137  internal_memset(f, 0, sizeof(*f));
138
139  f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
140  f->symbolize = (asan_external_symbolizer != 0);
141  f->verbosity = 0;
142  f->redzone = 16;
143  f->debug = false;
144  f->report_globals = 1;
145  f->check_initialization_order = false;
146  f->malloc_context_size = kDeafultMallocContextSize;
147  f->replace_str = true;
148  f->replace_intrin = true;
149  f->mac_ignore_invalid_free = false;
150  f->use_fake_stack = true;
151  f->max_malloc_fill_size = 0x1000;  // By default, fill only the first 4K.
152  f->malloc_fill_byte = 0xbe;
153  f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
154  f->allow_user_poisoning = true;
155  f->sleep_before_dying = 0;
156  f->handle_segv = ASAN_NEEDS_SEGV;
157  f->use_sigaltstack = false;
158  f->check_malloc_usable_size = true;
159  f->unmap_shadow_on_exit = false;
160  f->abort_on_error = false;
161  f->print_stats = false;
162  f->print_legend = true;
163  f->atexit = false;
164  f->disable_core = (SANITIZER_WORDSIZE == 64);
165  f->strip_path_prefix = "";
166  f->allow_reexec = true;
167  f->print_full_thread_history = true;
168  f->log_path = 0;
169  f->fast_unwind_on_fatal = false;
170  f->fast_unwind_on_malloc = true;
171  f->poison_heap = true;
172  // Turn off alloc/dealloc mismatch checker on Mac for now.
173  // TODO(glider): Fix known issues and enable this back.
174  f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0);;
175  f->use_stack_depot = true;  // Only affects allocator2.
176  f->strict_memcmp = true;
177
178  // Override from compile definition.
179  ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton());
180
181  // Override from user-specified string.
182  ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
183  if (flags()->verbosity) {
184    Report("Using the defaults from __asan_default_options: %s\n",
185           MaybeCallAsanDefaultOptions());
186  }
187
188  // Override from command line.
189  ParseFlagsFromString(f, env);
190}
191
192// -------------------------- Globals --------------------- {{{1
193int asan_inited;
194bool asan_init_is_running;
195void (*death_callback)(void);
196
197#if !ASAN_FIXED_MAPPING
198uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
199#endif
200
201// -------------------------- Misc ---------------- {{{1
202void ShowStatsAndAbort() {
203  __asan_print_accumulated_stats();
204  Die();
205}
206
207// ---------------------- mmap -------------------- {{{1
208// Reserve memory range [beg, end].
209static void ReserveShadowMemoryRange(uptr beg, uptr end) {
210  CHECK((beg % GetPageSizeCached()) == 0);
211  CHECK(((end + 1) % GetPageSizeCached()) == 0);
212  uptr size = end - beg + 1;
213  void *res = MmapFixedNoReserve(beg, size);
214  if (res != (void*)beg) {
215    Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
216           "Perhaps you're using ulimit -v\n", size);
217    Abort();
218  }
219}
220
221// --------------- LowLevelAllocateCallbac ---------- {{{1
222static void OnLowLevelAllocate(uptr ptr, uptr size) {
223  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
224}
225
226// -------------------------- Run-time entry ------------------- {{{1
227// exported functions
228#define ASAN_REPORT_ERROR(type, is_write, size)                     \
229extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
230void __asan_report_ ## type ## size(uptr addr);                \
231void __asan_report_ ## type ## size(uptr addr) {               \
232  GET_CALLER_PC_BP_SP;                                              \
233  __asan_report_error(pc, bp, sp, addr, is_write, size);            \
234}
235
236ASAN_REPORT_ERROR(load, false, 1)
237ASAN_REPORT_ERROR(load, false, 2)
238ASAN_REPORT_ERROR(load, false, 4)
239ASAN_REPORT_ERROR(load, false, 8)
240ASAN_REPORT_ERROR(load, false, 16)
241ASAN_REPORT_ERROR(store, true, 1)
242ASAN_REPORT_ERROR(store, true, 2)
243ASAN_REPORT_ERROR(store, true, 4)
244ASAN_REPORT_ERROR(store, true, 8)
245ASAN_REPORT_ERROR(store, true, 16)
246
247#define ASAN_REPORT_ERROR_N(type, is_write)                    \
248extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
249void __asan_report_ ## type ## _n(uptr addr, uptr size);       \
250void __asan_report_ ## type ## _n(uptr addr, uptr size) {      \
251  GET_CALLER_PC_BP_SP;                                         \
252  __asan_report_error(pc, bp, sp, addr, is_write, size);       \
253}
254
255ASAN_REPORT_ERROR_N(load, false)
256ASAN_REPORT_ERROR_N(store, true)
257
258// Force the linker to keep the symbols for various ASan interface functions.
259// We want to keep those in the executable in order to let the instrumented
260// dynamic libraries access the symbol even if it is not used by the executable
261// itself. This should help if the build system is removing dead code at link
262// time.
263static NOINLINE void force_interface_symbols() {
264  volatile int fake_condition = 0;  // prevent dead condition elimination.
265  // __asan_report_* functions are noreturn, so we need a switch to prevent
266  // the compiler from removing any of them.
267  switch (fake_condition) {
268    case 1: __asan_report_load1(0); break;
269    case 2: __asan_report_load2(0); break;
270    case 3: __asan_report_load4(0); break;
271    case 4: __asan_report_load8(0); break;
272    case 5: __asan_report_load16(0); break;
273    case 6: __asan_report_store1(0); break;
274    case 7: __asan_report_store2(0); break;
275    case 8: __asan_report_store4(0); break;
276    case 9: __asan_report_store8(0); break;
277    case 10: __asan_report_store16(0); break;
278    case 12: __asan_register_globals(0, 0); break;
279    case 13: __asan_unregister_globals(0, 0); break;
280    case 14: __asan_set_death_callback(0); break;
281    case 15: __asan_set_error_report_callback(0); break;
282    case 16: __asan_handle_no_return(); break;
283    case 17: __asan_address_is_poisoned(0); break;
284    case 18: __asan_get_allocated_size(0); break;
285    case 19: __asan_get_current_allocated_bytes(); break;
286    case 20: __asan_get_estimated_allocated_size(0); break;
287    case 21: __asan_get_free_bytes(); break;
288    case 22: __asan_get_heap_size(); break;
289    case 23: __asan_get_ownership(0); break;
290    case 24: __asan_get_unmapped_bytes(); break;
291    case 25: __asan_poison_memory_region(0, 0); break;
292    case 26: __asan_unpoison_memory_region(0, 0); break;
293    case 27: __asan_set_error_exit_code(0); break;
294    case 28: __asan_stack_free(0, 0, 0); break;
295    case 29: __asan_stack_malloc(0, 0); break;
296    case 30: __asan_before_dynamic_init(0); break;
297    case 31: __asan_after_dynamic_init(); break;
298    case 32: __asan_poison_stack_memory(0, 0); break;
299    case 33: __asan_unpoison_stack_memory(0, 0); break;
300    case 34: __asan_region_is_poisoned(0, 0); break;
301    case 35: __asan_describe_address(0); break;
302  }
303}
304
305static void asan_atexit() {
306  Printf("AddressSanitizer exit stats:\n");
307  __asan_print_accumulated_stats();
308  // Print AsanMappingProfile.
309  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
310    if (AsanMappingProfile[i] == 0) continue;
311    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
312  }
313}
314
315static void InitializeHighMemEnd() {
316#if !ASAN_FIXED_MAPPING
317#if SANITIZER_WORDSIZE == 64
318# if defined(__powerpc64__)
319  // FIXME:
320  // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
321  // We somehow need to figure our which one we are using now and choose
322  // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
323  // Note that with 'ulimit -s unlimited' the stack is moved away from the top
324  // of the address space, so simply checking the stack address is not enough.
325  kHighMemEnd = (1ULL << 44) - 1;  // 0x00000fffffffffffUL
326# else
327  kHighMemEnd = (1ULL << 47) - 1;  // 0x00007fffffffffffUL;
328# endif
329#else  // SANITIZER_WORDSIZE == 32
330  kHighMemEnd = (1ULL << 32) - 1;  // 0xffffffff;
331#endif  // SANITIZER_WORDSIZE
332#endif  // !ASAN_FIXED_MAPPING
333}
334
335static void ProtectGap(uptr a, uptr size) {
336  CHECK_EQ(a, (uptr)Mprotect(a, size));
337}
338
339static void PrintAddressSpaceLayout() {
340  Printf("|| `[%p, %p]` || HighMem    ||\n",
341         (void*)kHighMemBeg, (void*)kHighMemEnd);
342  Printf("|| `[%p, %p]` || HighShadow ||\n",
343         (void*)kHighShadowBeg, (void*)kHighShadowEnd);
344  if (kMidMemBeg) {
345    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
346           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
347    Printf("|| `[%p, %p]` || MidMem     ||\n",
348           (void*)kMidMemBeg, (void*)kMidMemEnd);
349    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
350           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
351    Printf("|| `[%p, %p]` || MidShadow  ||\n",
352           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
353  }
354  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
355         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
356  if (kLowShadowBeg) {
357    Printf("|| `[%p, %p]` || LowShadow  ||\n",
358           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
359    Printf("|| `[%p, %p]` || LowMem     ||\n",
360           (void*)kLowMemBeg, (void*)kLowMemEnd);
361  }
362  Printf("MemToShadow(shadow): %p %p %p %p",
363         (void*)MEM_TO_SHADOW(kLowShadowBeg),
364         (void*)MEM_TO_SHADOW(kLowShadowEnd),
365         (void*)MEM_TO_SHADOW(kHighShadowBeg),
366         (void*)MEM_TO_SHADOW(kHighShadowEnd));
367  if (kMidMemBeg) {
368    Printf(" %p %p",
369           (void*)MEM_TO_SHADOW(kMidShadowBeg),
370           (void*)MEM_TO_SHADOW(kMidShadowEnd));
371  }
372  Printf("\n");
373  Printf("red_zone=%zu\n", (uptr)flags()->redzone);
374  Printf("malloc_context_size=%zu\n", (uptr)flags()->malloc_context_size);
375
376  Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE);
377  Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY);
378  Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET);
379  CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
380  if (kMidMemBeg)
381    CHECK(kMidShadowBeg > kLowShadowEnd &&
382          kMidMemBeg > kMidShadowEnd &&
383          kHighShadowBeg > kMidMemEnd);
384}
385
386}  // namespace __asan
387
388// ---------------------- Interface ---------------- {{{1
389using namespace __asan;  // NOLINT
390
391#if !SANITIZER_SUPPORTS_WEAK_HOOKS
392extern "C" {
393SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
394const char* __asan_default_options() { return ""; }
395}  // extern "C"
396#endif
397
398int NOINLINE __asan_set_error_exit_code(int exit_code) {
399  int old = flags()->exitcode;
400  flags()->exitcode = exit_code;
401  return old;
402}
403
404void NOINLINE __asan_handle_no_return() {
405  int local_stack;
406  AsanThread *curr_thread = GetCurrentThread();
407  CHECK(curr_thread);
408  uptr PageSize = GetPageSizeCached();
409  uptr top = curr_thread->stack_top();
410  uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1);
411  PoisonShadow(bottom, top - bottom, 0);
412}
413
414void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
415  death_callback = callback;
416}
417
418void __asan_init() {
419  if (asan_inited) return;
420  SanitizerToolName = "AddressSanitizer";
421  CHECK(!asan_init_is_running && "ASan init calls itself!");
422  asan_init_is_running = true;
423  InitializeHighMemEnd();
424
425  // Make sure we are not statically linked.
426  AsanDoesNotSupportStaticLinkage();
427
428  // Install tool-specific callbacks in sanitizer_common.
429  SetDieCallback(AsanDie);
430  SetCheckFailedCallback(AsanCheckFailed);
431  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
432
433  // Check if external symbolizer is defined before parsing the flags.
434  asan_external_symbolizer = GetEnv("ASAN_SYMBOLIZER_PATH");
435  // Initialize flags. This must be done early, because most of the
436  // initialization steps look at flags().
437  const char *options = GetEnv("ASAN_OPTIONS");
438  InitializeFlags(flags(), options);
439  __sanitizer_set_report_path(flags()->log_path);
440
441  if (flags()->verbosity && options) {
442    Report("Parsed ASAN_OPTIONS: %s\n", options);
443  }
444
445  // Re-exec ourselves if we need to set additional env or command line args.
446  MaybeReexec();
447
448  // Setup internal allocator callback.
449  SetLowLevelAllocateCallback(OnLowLevelAllocate);
450
451  if (flags()->atexit) {
452    Atexit(asan_atexit);
453  }
454
455  // interceptors
456  InitializeAsanInterceptors();
457
458  ReplaceSystemMalloc();
459  ReplaceOperatorsNewAndDelete();
460
461  uptr shadow_start = kLowShadowBeg;
462  if (kLowShadowBeg) shadow_start -= GetMmapGranularity();
463  uptr shadow_end = kHighShadowEnd;
464  bool full_shadow_is_available =
465      MemoryRangeIsAvailable(shadow_start, shadow_end);
466
467#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING
468  if (!full_shadow_is_available) {
469    kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
470    kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
471  }
472#endif
473
474  if (flags()->verbosity)
475    PrintAddressSpaceLayout();
476
477  if (flags()->disable_core) {
478    DisableCoreDumper();
479  }
480
481  if (full_shadow_is_available) {
482    // mmap the low shadow plus at least one page at the left.
483    if (kLowShadowBeg)
484      ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
485    // mmap the high shadow.
486    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
487    // protect the gap.
488    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
489  } else if (kMidMemBeg &&
490      MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
491      MemoryRangeIsAvailable(kMidMemEnd + 1, shadow_end)) {
492    CHECK(kLowShadowBeg != kLowShadowEnd);
493    // mmap the low shadow plus at least one page at the left.
494    ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
495    // mmap the mid shadow.
496    ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd);
497    // mmap the high shadow.
498    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
499    // protect the gaps.
500    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
501    ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
502    ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
503  } else {
504    Report("Shadow memory range interleaves with an existing memory mapping. "
505           "ASan cannot proceed correctly. ABORTING.\n");
506    DumpProcessMap();
507    Die();
508  }
509
510  InstallSignalHandlers();
511  // Start symbolizer process if necessary.
512  if (flags()->symbolize && asan_external_symbolizer &&
513      asan_external_symbolizer[0]) {
514    InitializeExternalSymbolizer(asan_external_symbolizer);
515  }
516
517  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
518  // should be set to 1 prior to initializing the threads.
519  asan_inited = 1;
520  asan_init_is_running = false;
521
522  // Create main thread.
523  AsanTSDInit(AsanThread::TSDDtor);
524  AsanThread *main_thread = AsanThread::Create(0, 0);
525  CreateThreadContextArgs create_main_args = { main_thread, 0 };
526  u32 main_tid = asanThreadRegistry().CreateThread(
527      0, true, 0, &create_main_args);
528  CHECK_EQ(0, main_tid);
529  SetCurrentThread(main_thread);
530  main_thread->ThreadStart(GetPid());
531  force_interface_symbols();  // no-op.
532
533  InitializeAllocator();
534
535  if (flags()->verbosity) {
536    Report("AddressSanitizer Init done\n");
537  }
538}
539