asan_rtl.cc revision a2e70d92b67703effb631d7b4db8979fd74d5db5 
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_interface_internal.h"
17#include "asan_internal.h"
18#include "asan_mapping.h"
19#include "asan_poisoning.h"
20#include "asan_report.h"
21#include "asan_stack.h"
22#include "asan_stats.h"
23#include "asan_thread.h"
24#include "sanitizer_common/sanitizer_atomic.h"
25#include "sanitizer_common/sanitizer_flags.h"
26#include "sanitizer_common/sanitizer_libc.h"
27#include "sanitizer_common/sanitizer_symbolizer.h"
28#include "lsan/lsan_common.h"
29
30int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
31
32namespace __asan {
33
34uptr AsanMappingProfile[kAsanMappingProfileSize];
35
36static void AsanDie() {
37  static atomic_uint32_t num_calls;
38  if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
39    // Don't die twice - run a busy loop.
40    while (1) { }
41  }
42  if (flags()->sleep_before_dying) {
43    Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
44    SleepForSeconds(flags()->sleep_before_dying);
45  }
46  if (flags()->unmap_shadow_on_exit) {
47    if (kMidMemBeg) {
48      UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
49      UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
50    } else {
51      UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
52    }
53  }
54  if (death_callback)
55    death_callback();
56  if (flags()->abort_on_error)
57    Abort();
58  internal__exit(flags()->exitcode);
59}
60
61static void AsanCheckFailed(const char *file, int line, const char *cond,
62                            u64 v1, u64 v2) {
63  Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n",
64             file, line, cond, (uptr)v1, (uptr)v2);
65  // FIXME: check for infinite recursion without a thread-local counter here.
66  PRINT_CURRENT_STACK();
67  Die();
68}
69
70// -------------------------- Flags ------------------------- {{{1
71static const int kDefaultMallocContextSize = 30;
72
73Flags asan_flags_dont_use_directly;  // use via flags().
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  ParseCommonFlagsFromString(str);
92  CHECK((uptr)common_flags()->malloc_context_size <= kStackTraceMax);
93
94  ParseFlag(str, &f->quarantine_size, "quarantine_size");
95  ParseFlag(str, &f->redzone, "redzone");
96  CHECK_GE(f->redzone, 16);
97  CHECK(IsPowerOfTwo(f->redzone));
98
99  ParseFlag(str, &f->debug, "debug");
100  ParseFlag(str, &f->report_globals, "report_globals");
101  ParseFlag(str, &f->check_initialization_order, "check_initialization_order");
102
103  ParseFlag(str, &f->replace_str, "replace_str");
104  ParseFlag(str, &f->replace_intrin, "replace_intrin");
105  ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free");
106  ParseFlag(str, &f->detect_stack_use_after_return,
107            "detect_stack_use_after_return");
108  ParseFlag(str, &f->uar_stack_size_log, "uar_stack_size_log");
109  ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size");
110  ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte");
111  ParseFlag(str, &f->exitcode, "exitcode");
112  ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning");
113  ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying");
114  ParseFlag(str, &f->handle_segv, "handle_segv");
115  ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler");
116  ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack");
117  ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size");
118  ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit");
119  ParseFlag(str, &f->abort_on_error, "abort_on_error");
120  ParseFlag(str, &f->print_stats, "print_stats");
121  ParseFlag(str, &f->print_legend, "print_legend");
122  ParseFlag(str, &f->atexit, "atexit");
123  ParseFlag(str, &f->disable_core, "disable_core");
124  ParseFlag(str, &f->allow_reexec, "allow_reexec");
125  ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history");
126  ParseFlag(str, &f->poison_heap, "poison_heap");
127  ParseFlag(str, &f->poison_partial, "poison_partial");
128  ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch");
129  ParseFlag(str, &f->use_stack_depot, "use_stack_depot");
130  ParseFlag(str, &f->strict_memcmp, "strict_memcmp");
131  ParseFlag(str, &f->strict_init_order, "strict_init_order");
132}
133
134void InitializeFlags(Flags *f, const char *env) {
135  CommonFlags *cf = common_flags();
136  cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
137  cf->symbolize = true;
138  cf->malloc_context_size = kDefaultMallocContextSize;
139  cf->fast_unwind_on_fatal = false;
140  cf->fast_unwind_on_malloc = true;
141  cf->strip_path_prefix = "";
142  cf->handle_ioctl = false;
143  cf->log_path = 0;
144  cf->detect_leaks = false;
145  cf->leak_check_at_exit = true;
146
147  internal_memset(f, 0, sizeof(*f));
148  f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
149  f->redzone = 16;
150  f->debug = false;
151  f->report_globals = 1;
152  f->check_initialization_order = false;
153  f->replace_str = true;
154  f->replace_intrin = true;
155  f->mac_ignore_invalid_free = false;
156  f->detect_stack_use_after_return = false;  // Also needs the compiler flag.
157  f->uar_stack_size_log = 0;
158  f->max_malloc_fill_size = 0x1000;  // By default, fill only the first 4K.
159  f->malloc_fill_byte = 0xbe;
160  f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
161  f->allow_user_poisoning = true;
162  f->sleep_before_dying = 0;
163  f->handle_segv = ASAN_NEEDS_SEGV;
164  f->allow_user_segv_handler = false;
165  f->use_sigaltstack = false;
166  f->check_malloc_usable_size = true;
167  f->unmap_shadow_on_exit = false;
168  f->abort_on_error = false;
169  f->print_stats = false;
170  f->print_legend = true;
171  f->atexit = false;
172  f->disable_core = (SANITIZER_WORDSIZE == 64);
173  f->allow_reexec = true;
174  f->print_full_thread_history = true;
175  f->poison_heap = true;
176  f->poison_partial = true;
177  // Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
178  // TODO(glider,timurrrr): Fix known issues and enable this back.
179  f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0);
180  f->use_stack_depot = true;
181  f->strict_memcmp = true;
182  f->strict_init_order = false;
183
184  // Override from compile definition.
185  ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton());
186
187  // Override from user-specified string.
188  ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
189  if (common_flags()->verbosity) {
190    Report("Using the defaults from __asan_default_options: %s\n",
191           MaybeCallAsanDefaultOptions());
192  }
193
194  // Override from command line.
195  ParseFlagsFromString(f, env);
196
197#if !CAN_SANITIZE_LEAKS
198  if (cf->detect_leaks) {
199    Report("%s: detect_leaks is not supported on this platform.\n",
200           SanitizerToolName);
201    cf->detect_leaks = false;
202  }
203#endif
204
205  if (cf->detect_leaks && !f->use_stack_depot) {
206    Report("%s: detect_leaks is ignored (requires use_stack_depot).\n",
207           SanitizerToolName);
208    cf->detect_leaks = false;
209  }
210}
211
212// -------------------------- Globals --------------------- {{{1
213int asan_inited;
214bool asan_init_is_running;
215void (*death_callback)(void);
216
217#if !ASAN_FIXED_MAPPING
218uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
219#endif
220
221// -------------------------- Misc ---------------- {{{1
222void ShowStatsAndAbort() {
223  __asan_print_accumulated_stats();
224  Die();
225}
226
227// ---------------------- mmap -------------------- {{{1
228// Reserve memory range [beg, end].
229static void ReserveShadowMemoryRange(uptr beg, uptr end) {
230  CHECK_EQ((beg % GetPageSizeCached()), 0);
231  CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
232  uptr size = end - beg + 1;
233  void *res = MmapFixedNoReserve(beg, size);
234  if (res != (void*)beg) {
235    Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
236           "Perhaps you're using ulimit -v\n", size);
237    Abort();
238  }
239}
240
241// --------------- LowLevelAllocateCallbac ---------- {{{1
242static void OnLowLevelAllocate(uptr ptr, uptr size) {
243  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
244}
245
246// -------------------------- Run-time entry ------------------- {{{1
247// exported functions
248#define ASAN_REPORT_ERROR(type, is_write, size)                     \
249extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
250void __asan_report_ ## type ## size(uptr addr);                \
251void __asan_report_ ## type ## size(uptr addr) {               \
252  GET_CALLER_PC_BP_SP;                                              \
253  __asan_report_error(pc, bp, sp, addr, is_write, size);            \
254}
255
256ASAN_REPORT_ERROR(load, false, 1)
257ASAN_REPORT_ERROR(load, false, 2)
258ASAN_REPORT_ERROR(load, false, 4)
259ASAN_REPORT_ERROR(load, false, 8)
260ASAN_REPORT_ERROR(load, false, 16)
261ASAN_REPORT_ERROR(store, true, 1)
262ASAN_REPORT_ERROR(store, true, 2)
263ASAN_REPORT_ERROR(store, true, 4)
264ASAN_REPORT_ERROR(store, true, 8)
265ASAN_REPORT_ERROR(store, true, 16)
266
267#define ASAN_REPORT_ERROR_N(type, is_write)                    \
268extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
269void __asan_report_ ## type ## _n(uptr addr, uptr size);       \
270void __asan_report_ ## type ## _n(uptr addr, uptr size) {      \
271  GET_CALLER_PC_BP_SP;                                         \
272  __asan_report_error(pc, bp, sp, addr, is_write, size);       \
273}
274
275ASAN_REPORT_ERROR_N(load, false)
276ASAN_REPORT_ERROR_N(store, true)
277
278// Force the linker to keep the symbols for various ASan interface functions.
279// We want to keep those in the executable in order to let the instrumented
280// dynamic libraries access the symbol even if it is not used by the executable
281// itself. This should help if the build system is removing dead code at link
282// time.
283static NOINLINE void force_interface_symbols() {
284  volatile int fake_condition = 0;  // prevent dead condition elimination.
285  // __asan_report_* functions are noreturn, so we need a switch to prevent
286  // the compiler from removing any of them.
287  switch (fake_condition) {
288    case 1: __asan_report_load1(0); break;
289    case 2: __asan_report_load2(0); break;
290    case 3: __asan_report_load4(0); break;
291    case 4: __asan_report_load8(0); break;
292    case 5: __asan_report_load16(0); break;
293    case 6: __asan_report_store1(0); break;
294    case 7: __asan_report_store2(0); break;
295    case 8: __asan_report_store4(0); break;
296    case 9: __asan_report_store8(0); break;
297    case 10: __asan_report_store16(0); break;
298    case 12: __asan_register_globals(0, 0); break;
299    case 13: __asan_unregister_globals(0, 0); break;
300    case 14: __asan_set_death_callback(0); break;
301    case 15: __asan_set_error_report_callback(0); break;
302    case 16: __asan_handle_no_return(); break;
303    case 17: __asan_address_is_poisoned(0); break;
304    case 18: __asan_get_allocated_size(0); break;
305    case 19: __asan_get_current_allocated_bytes(); break;
306    case 20: __asan_get_estimated_allocated_size(0); break;
307    case 21: __asan_get_free_bytes(); break;
308    case 22: __asan_get_heap_size(); break;
309    case 23: __asan_get_ownership(0); break;
310    case 24: __asan_get_unmapped_bytes(); break;
311    case 25: __asan_poison_memory_region(0, 0); break;
312    case 26: __asan_unpoison_memory_region(0, 0); break;
313    case 27: __asan_set_error_exit_code(0); break;
314    case 30: __asan_before_dynamic_init(0); break;
315    case 31: __asan_after_dynamic_init(); break;
316    case 32: __asan_poison_stack_memory(0, 0); break;
317    case 33: __asan_unpoison_stack_memory(0, 0); break;
318    case 34: __asan_region_is_poisoned(0, 0); break;
319    case 35: __asan_describe_address(0); break;
320  }
321}
322
323static void asan_atexit() {
324  Printf("AddressSanitizer exit stats:\n");
325  __asan_print_accumulated_stats();
326  // Print AsanMappingProfile.
327  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
328    if (AsanMappingProfile[i] == 0) continue;
329    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
330  }
331}
332
333static void InitializeHighMemEnd() {
334#if !ASAN_FIXED_MAPPING
335  kHighMemEnd = GetMaxVirtualAddress();
336  // Increase kHighMemEnd to make sure it's properly
337  // aligned together with kHighMemBeg:
338  kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1;
339#endif  // !ASAN_FIXED_MAPPING
340  CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0);
341}
342
343static void ProtectGap(uptr a, uptr size) {
344  CHECK_EQ(a, (uptr)Mprotect(a, size));
345}
346
347static void PrintAddressSpaceLayout() {
348  Printf("|| `[%p, %p]` || HighMem    ||\n",
349         (void*)kHighMemBeg, (void*)kHighMemEnd);
350  Printf("|| `[%p, %p]` || HighShadow ||\n",
351         (void*)kHighShadowBeg, (void*)kHighShadowEnd);
352  if (kMidMemBeg) {
353    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
354           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
355    Printf("|| `[%p, %p]` || MidMem     ||\n",
356           (void*)kMidMemBeg, (void*)kMidMemEnd);
357    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
358           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
359    Printf("|| `[%p, %p]` || MidShadow  ||\n",
360           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
361  }
362  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
363         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
364  if (kLowShadowBeg) {
365    Printf("|| `[%p, %p]` || LowShadow  ||\n",
366           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
367    Printf("|| `[%p, %p]` || LowMem     ||\n",
368           (void*)kLowMemBeg, (void*)kLowMemEnd);
369  }
370  Printf("MemToShadow(shadow): %p %p %p %p",
371         (void*)MEM_TO_SHADOW(kLowShadowBeg),
372         (void*)MEM_TO_SHADOW(kLowShadowEnd),
373         (void*)MEM_TO_SHADOW(kHighShadowBeg),
374         (void*)MEM_TO_SHADOW(kHighShadowEnd));
375  if (kMidMemBeg) {
376    Printf(" %p %p",
377           (void*)MEM_TO_SHADOW(kMidShadowBeg),
378           (void*)MEM_TO_SHADOW(kMidShadowEnd));
379  }
380  Printf("\n");
381  Printf("red_zone=%zu\n", (uptr)flags()->redzone);
382  Printf("quarantine_size=%zuM\n", (uptr)flags()->quarantine_size >> 20);
383  Printf("malloc_context_size=%zu\n",
384         (uptr)common_flags()->malloc_context_size);
385
386  Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE);
387  Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY);
388  Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET);
389  CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
390  if (kMidMemBeg)
391    CHECK(kMidShadowBeg > kLowShadowEnd &&
392          kMidMemBeg > kMidShadowEnd &&
393          kHighShadowBeg > kMidMemEnd);
394}
395
396}  // namespace __asan
397
398// ---------------------- Interface ---------------- {{{1
399using namespace __asan;  // NOLINT
400
401#if !SANITIZER_SUPPORTS_WEAK_HOOKS
402extern "C" {
403SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
404const char* __asan_default_options() { return ""; }
405}  // extern "C"
406#endif
407
408int NOINLINE __asan_set_error_exit_code(int exit_code) {
409  int old = flags()->exitcode;
410  flags()->exitcode = exit_code;
411  return old;
412}
413
414void NOINLINE __asan_handle_no_return() {
415  int local_stack;
416  AsanThread *curr_thread = GetCurrentThread();
417  CHECK(curr_thread);
418  uptr PageSize = GetPageSizeCached();
419  uptr top = curr_thread->stack_top();
420  uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1);
421  static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
422  if (top - bottom > kMaxExpectedCleanupSize) {
423    static bool reported_warning = false;
424    if (reported_warning)
425      return;
426    reported_warning = true;
427    Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
428           "stack top: %p; bottom %p; size: %p (%zd)\n"
429           "False positive error reports may follow\n"
430           "For details see "
431           "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n",
432           top, bottom, top - bottom, top - bottom);
433    return;
434  }
435  PoisonShadow(bottom, top - bottom, 0);
436  if (curr_thread->has_fake_stack())
437    curr_thread->fake_stack()->HandleNoReturn();
438}
439
440void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
441  death_callback = callback;
442}
443
444void __asan_init() {
445  if (asan_inited) return;
446  SanitizerToolName = "AddressSanitizer";
447  CHECK(!asan_init_is_running && "ASan init calls itself!");
448  asan_init_is_running = true;
449  InitializeHighMemEnd();
450
451  // Make sure we are not statically linked.
452  AsanDoesNotSupportStaticLinkage();
453
454  // Install tool-specific callbacks in sanitizer_common.
455  SetDieCallback(AsanDie);
456  SetCheckFailedCallback(AsanCheckFailed);
457  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
458
459  // Initialize flags. This must be done early, because most of the
460  // initialization steps look at flags().
461  const char *options = GetEnv("ASAN_OPTIONS");
462  InitializeFlags(flags(), options);
463  __sanitizer_set_report_path(common_flags()->log_path);
464  __asan_option_detect_stack_use_after_return =
465      flags()->detect_stack_use_after_return;
466
467  if (common_flags()->verbosity && options) {
468    Report("Parsed ASAN_OPTIONS: %s\n", options);
469  }
470
471  // Re-exec ourselves if we need to set additional env or command line args.
472  MaybeReexec();
473
474  // Setup internal allocator callback.
475  SetLowLevelAllocateCallback(OnLowLevelAllocate);
476
477  InitializeAsanInterceptors();
478
479  ReplaceSystemMalloc();
480  ReplaceOperatorsNewAndDelete();
481
482  uptr shadow_start = kLowShadowBeg;
483  if (kLowShadowBeg)
484    shadow_start -= GetMmapGranularity();
485  bool full_shadow_is_available =
486      MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
487
488#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING
489  if (!full_shadow_is_available) {
490    kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
491    kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
492  }
493#endif
494
495  if (common_flags()->verbosity)
496    PrintAddressSpaceLayout();
497
498  if (flags()->disable_core) {
499    DisableCoreDumper();
500  }
501
502  if (full_shadow_is_available) {
503    // mmap the low shadow plus at least one page at the left.
504    if (kLowShadowBeg)
505      ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
506    // mmap the high shadow.
507    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
508    // protect the gap.
509    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
510  } else if (kMidMemBeg &&
511      MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
512      MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
513    CHECK(kLowShadowBeg != kLowShadowEnd);
514    // mmap the low shadow plus at least one page at the left.
515    ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
516    // mmap the mid shadow.
517    ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd);
518    // mmap the high shadow.
519    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
520    // protect the gaps.
521    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
522    ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
523    ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
524  } else {
525    Report("Shadow memory range interleaves with an existing memory mapping. "
526           "ASan cannot proceed correctly. ABORTING.\n");
527    DumpProcessMap();
528    Die();
529  }
530
531  AsanTSDInit(PlatformTSDDtor);
532  InstallSignalHandlers();
533
534  // Allocator should be initialized before starting external symbolizer, as
535  // fork() on Mac locks the allocator.
536  InitializeAllocator();
537
538  // Start symbolizer process if necessary.
539  if (common_flags()->symbolize && &getSymbolizer) {
540    getSymbolizer()
541        ->InitializeExternal(common_flags()->external_symbolizer_path);
542  }
543
544  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
545  // should be set to 1 prior to initializing the threads.
546  asan_inited = 1;
547  asan_init_is_running = false;
548
549  if (flags()->atexit)
550    Atexit(asan_atexit);
551
552  // interceptors
553  InitTlsSize();
554
555  // Create main thread.
556  AsanThread *main_thread = AsanThread::Create(0, 0);
557  CreateThreadContextArgs create_main_args = { main_thread, 0 };
558  u32 main_tid = asanThreadRegistry().CreateThread(
559      0, true, 0, &create_main_args);
560  CHECK_EQ(0, main_tid);
561  SetCurrentThread(main_thread);
562  main_thread->ThreadStart(internal_getpid());
563  force_interface_symbols();  // no-op.
564
565#if CAN_SANITIZE_LEAKS
566  __lsan::InitCommonLsan();
567  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
568    Atexit(__lsan::DoLeakCheck);
569  }
570#endif  // CAN_SANITIZE_LEAKS
571
572  if (common_flags()->verbosity) {
573    Report("AddressSanitizer Init done\n");
574  }
575}
576