asan_rtl.cc revision 1.4 
1//===-- asan_rtl.cc -------------------------------------------------------===//
2//
3// This file is distributed under the University of Illinois Open Source
4// License. See LICENSE.TXT for details.
5//
6//===----------------------------------------------------------------------===//
7//
8// This file is a part of AddressSanitizer, an address sanity checker.
9//
10// Main file of the ASan run-time library.
11//===----------------------------------------------------------------------===//
12
13#include "asan_activation.h"
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_suppressions.h"
24#include "asan_thread.h"
25#include "sanitizer_common/sanitizer_atomic.h"
26#include "sanitizer_common/sanitizer_flags.h"
27#include "sanitizer_common/sanitizer_libc.h"
28#include "sanitizer_common/sanitizer_symbolizer.h"
29#include "lsan/lsan_common.h"
30#include "ubsan/ubsan_init.h"
31#include "ubsan/ubsan_platform.h"
32
33int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
34uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
35
36namespace __asan {
37
38uptr AsanMappingProfile[kAsanMappingProfileSize];
39
40static void AsanDie() {
41  static atomic_uint32_t num_calls;
42  if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
43    // Don't die twice - run a busy loop.
44    while (1) { }
45  }
46  if (flags()->sleep_before_dying) {
47    Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
48    SleepForSeconds(flags()->sleep_before_dying);
49  }
50  if (flags()->unmap_shadow_on_exit) {
51    if (kMidMemBeg) {
52      UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
53      UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
54    } else {
55      UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
56    }
57  }
58}
59
60static void AsanCheckFailed(const char *file, int line, const char *cond,
61                            u64 v1, u64 v2) {
62  Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
63         line, cond, (uptr)v1, (uptr)v2);
64  // FIXME: check for infinite recursion without a thread-local counter here.
65  PRINT_CURRENT_STACK_CHECK();
66  Die();
67}
68
69// -------------------------- Globals --------------------- {{{1
70int asan_inited;
71bool asan_init_is_running;
72
73#if !ASAN_FIXED_MAPPING
74uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
75#endif
76
77// -------------------------- Misc ---------------- {{{1
78void ShowStatsAndAbort() {
79  __asan_print_accumulated_stats();
80  Die();
81}
82
83// ---------------------- mmap -------------------- {{{1
84// Reserve memory range [beg, end].
85// We need to use inclusive range because end+1 may not be representable.
86void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) {
87  CHECK_EQ((beg % GetPageSizeCached()), 0);
88  CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
89  uptr size = end - beg + 1;
90  DecreaseTotalMmap(size);  // Don't count the shadow against mmap_limit_mb.
91  void *res = MmapFixedNoReserve(beg, size, name);
92  if (res != (void*)beg) {
93    Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
94           "Perhaps you're using ulimit -v\n", size);
95    Abort();
96  }
97  if (common_flags()->no_huge_pages_for_shadow)
98    NoHugePagesInRegion(beg, size);
99  if (common_flags()->use_madv_dontdump)
100    DontDumpShadowMemory(beg, size);
101}
102
103// --------------- LowLevelAllocateCallbac ---------- {{{1
104static void OnLowLevelAllocate(uptr ptr, uptr size) {
105  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
106}
107
108// -------------------------- Run-time entry ------------------- {{{1
109// exported functions
110#define ASAN_REPORT_ERROR(type, is_write, size)                     \
111extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
112void __asan_report_ ## type ## size(uptr addr) {                    \
113  GET_CALLER_PC_BP_SP;                                              \
114  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);    \
115}                                                                   \
116extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
117void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
118  GET_CALLER_PC_BP_SP;                                              \
119  ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);  \
120}                                                                   \
121extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
122void __asan_report_ ## type ## size ## _noabort(uptr addr) {        \
123  GET_CALLER_PC_BP_SP;                                              \
124  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);   \
125}                                                                   \
126
127ASAN_REPORT_ERROR(load, false, 1)
128ASAN_REPORT_ERROR(load, false, 2)
129ASAN_REPORT_ERROR(load, false, 4)
130ASAN_REPORT_ERROR(load, false, 8)
131ASAN_REPORT_ERROR(load, false, 16)
132ASAN_REPORT_ERROR(store, true, 1)
133ASAN_REPORT_ERROR(store, true, 2)
134ASAN_REPORT_ERROR(store, true, 4)
135ASAN_REPORT_ERROR(store, true, 8)
136ASAN_REPORT_ERROR(store, true, 16)
137
138#define ASAN_REPORT_ERROR_N(type, is_write)                                 \
139extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
140void __asan_report_ ## type ## _n(uptr addr, uptr size) {                   \
141  GET_CALLER_PC_BP_SP;                                                      \
142  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);            \
143}                                                                           \
144extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
145void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
146  GET_CALLER_PC_BP_SP;                                                      \
147  ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);          \
148}                                                                           \
149extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
150void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) {           \
151  GET_CALLER_PC_BP_SP;                                                      \
152  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);           \
153}                                                                           \
154
155ASAN_REPORT_ERROR_N(load, false)
156ASAN_REPORT_ERROR_N(store, true)
157
158#define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
159    uptr sp = MEM_TO_SHADOW(addr);                                             \
160    uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp)          \
161                                        : *reinterpret_cast<u16 *>(sp);        \
162    if (UNLIKELY(s)) {                                                         \
163      if (UNLIKELY(size >= SHADOW_GRANULARITY ||                               \
164                   ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >=     \
165                       (s8)s)) {                                               \
166        if (__asan_test_only_reported_buggy_pointer) {                         \
167          *__asan_test_only_reported_buggy_pointer = addr;                     \
168        } else {                                                               \
169          GET_CALLER_PC_BP_SP;                                                 \
170          ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg,        \
171                              fatal);                                          \
172        }                                                                      \
173      }                                                                        \
174    }
175
176#define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size)                      \
177  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
178  void __asan_##type##size(uptr addr) {                                        \
179    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true)            \
180  }                                                                            \
181  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
182  void __asan_exp_##type##size(uptr addr, u32 exp) {                           \
183    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true)          \
184  }                                                                            \
185  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
186  void __asan_##type##size ## _noabort(uptr addr) {                            \
187    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false)           \
188  }                                                                            \
189
190ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
191ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
192ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
193ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
194ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
195ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
196ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
197ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
198ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
199ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
200
201extern "C"
202NOINLINE INTERFACE_ATTRIBUTE
203void __asan_loadN(uptr addr, uptr size) {
204  if (__asan_region_is_poisoned(addr, size)) {
205    GET_CALLER_PC_BP_SP;
206    ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
207  }
208}
209
210extern "C"
211NOINLINE INTERFACE_ATTRIBUTE
212void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
213  if (__asan_region_is_poisoned(addr, size)) {
214    GET_CALLER_PC_BP_SP;
215    ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
216  }
217}
218
219extern "C"
220NOINLINE INTERFACE_ATTRIBUTE
221void __asan_loadN_noabort(uptr addr, uptr size) {
222  if (__asan_region_is_poisoned(addr, size)) {
223    GET_CALLER_PC_BP_SP;
224    ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
225  }
226}
227
228extern "C"
229NOINLINE INTERFACE_ATTRIBUTE
230void __asan_storeN(uptr addr, uptr size) {
231  if (__asan_region_is_poisoned(addr, size)) {
232    GET_CALLER_PC_BP_SP;
233    ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
234  }
235}
236
237extern "C"
238NOINLINE INTERFACE_ATTRIBUTE
239void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
240  if (__asan_region_is_poisoned(addr, size)) {
241    GET_CALLER_PC_BP_SP;
242    ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
243  }
244}
245
246extern "C"
247NOINLINE INTERFACE_ATTRIBUTE
248void __asan_storeN_noabort(uptr addr, uptr size) {
249  if (__asan_region_is_poisoned(addr, size)) {
250    GET_CALLER_PC_BP_SP;
251    ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
252  }
253}
254
255// Force the linker to keep the symbols for various ASan interface functions.
256// We want to keep those in the executable in order to let the instrumented
257// dynamic libraries access the symbol even if it is not used by the executable
258// itself. This should help if the build system is removing dead code at link
259// time.
260static NOINLINE void force_interface_symbols() {
261  volatile int fake_condition = 0;  // prevent dead condition elimination.
262  // __asan_report_* functions are noreturn, so we need a switch to prevent
263  // the compiler from removing any of them.
264  switch (fake_condition) {
265    case 1: __asan_report_load1(0); break;
266    case 2: __asan_report_load2(0); break;
267    case 3: __asan_report_load4(0); break;
268    case 4: __asan_report_load8(0); break;
269    case 5: __asan_report_load16(0); break;
270    case 6: __asan_report_load_n(0, 0); break;
271    case 7: __asan_report_store1(0); break;
272    case 8: __asan_report_store2(0); break;
273    case 9: __asan_report_store4(0); break;
274    case 10: __asan_report_store8(0); break;
275    case 11: __asan_report_store16(0); break;
276    case 12: __asan_report_store_n(0, 0); break;
277    case 13: __asan_report_exp_load1(0, 0); break;
278    case 14: __asan_report_exp_load2(0, 0); break;
279    case 15: __asan_report_exp_load4(0, 0); break;
280    case 16: __asan_report_exp_load8(0, 0); break;
281    case 17: __asan_report_exp_load16(0, 0); break;
282    case 18: __asan_report_exp_load_n(0, 0, 0); break;
283    case 19: __asan_report_exp_store1(0, 0); break;
284    case 20: __asan_report_exp_store2(0, 0); break;
285    case 21: __asan_report_exp_store4(0, 0); break;
286    case 22: __asan_report_exp_store8(0, 0); break;
287    case 23: __asan_report_exp_store16(0, 0); break;
288    case 24: __asan_report_exp_store_n(0, 0, 0); break;
289    case 25: __asan_register_globals(nullptr, 0); break;
290    case 26: __asan_unregister_globals(nullptr, 0); break;
291    case 27: __asan_set_death_callback(nullptr); break;
292    case 28: __asan_set_error_report_callback(nullptr); break;
293    case 29: __asan_handle_no_return(); break;
294    case 30: __asan_address_is_poisoned(nullptr); break;
295    case 31: __asan_poison_memory_region(nullptr, 0); break;
296    case 32: __asan_unpoison_memory_region(nullptr, 0); break;
297    case 34: __asan_before_dynamic_init(nullptr); break;
298    case 35: __asan_after_dynamic_init(); break;
299    case 36: __asan_poison_stack_memory(0, 0); break;
300    case 37: __asan_unpoison_stack_memory(0, 0); break;
301    case 38: __asan_region_is_poisoned(0, 0); break;
302    case 39: __asan_describe_address(0); break;
303  }
304}
305
306static void asan_atexit() {
307  Printf("AddressSanitizer exit stats:\n");
308  __asan_print_accumulated_stats();
309  // Print AsanMappingProfile.
310  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
311    if (AsanMappingProfile[i] == 0) continue;
312    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
313  }
314}
315
316static void InitializeHighMemEnd() {
317#if !ASAN_FIXED_MAPPING
318  kHighMemEnd = GetMaxVirtualAddress();
319  // Increase kHighMemEnd to make sure it's properly
320  // aligned together with kHighMemBeg:
321  kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1;
322#endif  // !ASAN_FIXED_MAPPING
323  CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0);
324}
325
326static void ProtectGap(uptr addr, uptr size) {
327  if (!flags()->protect_shadow_gap)
328    return;
329  void *res = MmapNoAccess(addr, size, "shadow gap");
330  if (addr == (uptr)res)
331    return;
332  // A few pages at the start of the address space can not be protected.
333  // But we really want to protect as much as possible, to prevent this memory
334  // being returned as a result of a non-FIXED mmap().
335  if (addr == kZeroBaseShadowStart) {
336    uptr step = GetPageSizeCached();
337    while (size > step && addr < kZeroBaseMaxShadowStart) {
338      addr += step;
339      size -= step;
340      void *res = MmapNoAccess(addr, size, "shadow gap");
341      if (addr == (uptr)res)
342        return;
343    }
344  }
345
346  Report("ERROR: Failed to protect the shadow gap. "
347         "ASan cannot proceed correctly. ABORTING.\n");
348  DumpProcessMap();
349  Die();
350}
351
352static void PrintAddressSpaceLayout() {
353  Printf("|| `[%p, %p]` || HighMem    ||\n",
354         (void*)kHighMemBeg, (void*)kHighMemEnd);
355  Printf("|| `[%p, %p]` || HighShadow ||\n",
356         (void*)kHighShadowBeg, (void*)kHighShadowEnd);
357  if (kMidMemBeg) {
358    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
359           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
360    Printf("|| `[%p, %p]` || MidMem     ||\n",
361           (void*)kMidMemBeg, (void*)kMidMemEnd);
362    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
363           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
364    Printf("|| `[%p, %p]` || MidShadow  ||\n",
365           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
366  }
367  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
368         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
369  if (kLowShadowBeg) {
370    Printf("|| `[%p, %p]` || LowShadow  ||\n",
371           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
372    Printf("|| `[%p, %p]` || LowMem     ||\n",
373           (void*)kLowMemBeg, (void*)kLowMemEnd);
374  }
375  Printf("MemToShadow(shadow): %p %p %p %p",
376         (void*)MEM_TO_SHADOW(kLowShadowBeg),
377         (void*)MEM_TO_SHADOW(kLowShadowEnd),
378         (void*)MEM_TO_SHADOW(kHighShadowBeg),
379         (void*)MEM_TO_SHADOW(kHighShadowEnd));
380  if (kMidMemBeg) {
381    Printf(" %p %p",
382           (void*)MEM_TO_SHADOW(kMidShadowBeg),
383           (void*)MEM_TO_SHADOW(kMidShadowEnd));
384  }
385  Printf("\n");
386  Printf("redzone=%zu\n", (uptr)flags()->redzone);
387  Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
388  Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
389  Printf("malloc_context_size=%zu\n",
390         (uptr)common_flags()->malloc_context_size);
391
392  Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
393  Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
394  Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
395  CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
396  if (kMidMemBeg)
397    CHECK(kMidShadowBeg > kLowShadowEnd &&
398          kMidMemBeg > kMidShadowEnd &&
399          kHighShadowBeg > kMidMemEnd);
400}
401
402static void AsanInitInternal() {
403  if (LIKELY(asan_inited)) return;
404  SanitizerToolName = "AddressSanitizer";
405  CHECK(!asan_init_is_running && "ASan init calls itself!");
406  asan_init_is_running = true;
407
408  CacheBinaryName();
409
410  // Initialize flags. This must be done early, because most of the
411  // initialization steps look at flags().
412  InitializeFlags();
413
414  AsanCheckIncompatibleRT();
415  AsanCheckDynamicRTPrereqs();
416
417  SetCanPoisonMemory(flags()->poison_heap);
418  SetMallocContextSize(common_flags()->malloc_context_size);
419
420  InitializeHighMemEnd();
421
422  // Make sure we are not statically linked.
423  AsanDoesNotSupportStaticLinkage();
424
425  // Install tool-specific callbacks in sanitizer_common.
426  AddDieCallback(AsanDie);
427  SetCheckFailedCallback(AsanCheckFailed);
428  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
429
430  __sanitizer_set_report_path(common_flags()->log_path);
431
432  // Enable UAR detection, if required.
433  __asan_option_detect_stack_use_after_return =
434      flags()->detect_stack_use_after_return;
435
436  // Re-exec ourselves if we need to set additional env or command line args.
437  MaybeReexec();
438
439  // Setup internal allocator callback.
440  SetLowLevelAllocateCallback(OnLowLevelAllocate);
441
442  InitializeAsanInterceptors();
443
444  // Enable system log ("adb logcat") on Android.
445  // Doing this before interceptors are initialized crashes in:
446  // AsanInitInternal -> android_log_write -> __interceptor_strcmp
447  AndroidLogInit();
448
449  ReplaceSystemMalloc();
450
451  uptr shadow_start = kLowShadowBeg;
452  if (kLowShadowBeg)
453    shadow_start -= GetMmapGranularity();
454  bool full_shadow_is_available =
455      MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
456
457#if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) &&                \
458    !ASAN_FIXED_MAPPING
459  if (!full_shadow_is_available) {
460    kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
461    kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
462  }
463#endif
464
465  if (Verbosity()) PrintAddressSpaceLayout();
466
467  DisableCoreDumperIfNecessary();
468
469  if (full_shadow_is_available) {
470    // mmap the low shadow plus at least one page at the left.
471    if (kLowShadowBeg)
472      ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
473    // mmap the high shadow.
474    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
475    // protect the gap.
476    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
477    CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1);
478  } else if (kMidMemBeg &&
479      MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
480      MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
481    CHECK(kLowShadowBeg != kLowShadowEnd);
482    // mmap the low shadow plus at least one page at the left.
483    ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
484    // mmap the mid shadow.
485    ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow");
486    // mmap the high shadow.
487    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
488    // protect the gaps.
489    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
490    ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
491    ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
492  } else {
493    Report("Shadow memory range interleaves with an existing memory mapping. "
494           "ASan cannot proceed correctly. ABORTING.\n");
495    Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
496           shadow_start, kHighShadowEnd);
497    DumpProcessMap();
498    Die();
499  }
500
501  AsanTSDInit(PlatformTSDDtor);
502  InstallDeadlySignalHandlers(AsanOnDeadlySignal);
503
504  AllocatorOptions allocator_options;
505  allocator_options.SetFrom(flags(), common_flags());
506  InitializeAllocator(allocator_options);
507
508  MaybeStartBackgroudThread();
509  SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
510
511  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
512  // should be set to 1 prior to initializing the threads.
513  asan_inited = 1;
514  asan_init_is_running = false;
515
516  if (flags()->atexit)
517    Atexit(asan_atexit);
518
519  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
520
521  // Now that ASan runtime is (mostly) initialized, deactivate it if
522  // necessary, so that it can be re-activated when requested.
523  if (flags()->start_deactivated)
524    AsanDeactivate();
525
526  // interceptors
527  InitTlsSize();
528
529  // Create main thread.
530  AsanThread *main_thread = AsanThread::Create(
531      /* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0,
532      /* stack */ nullptr, /* detached */ true);
533  CHECK_EQ(0, main_thread->tid());
534  SetCurrentThread(main_thread);
535  main_thread->ThreadStart(internal_getpid(),
536                           /* signal_thread_is_registered */ nullptr);
537  force_interface_symbols();  // no-op.
538  SanitizerInitializeUnwinder();
539
540#if CAN_SANITIZE_LEAKS
541  __lsan::InitCommonLsan();
542  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
543    Atexit(__lsan::DoLeakCheck);
544  }
545#endif  // CAN_SANITIZE_LEAKS
546
547#if CAN_SANITIZE_UB
548  __ubsan::InitAsPlugin();
549#endif
550
551  InitializeSuppressions();
552
553  VReport(1, "AddressSanitizer Init done\n");
554}
555
556// Initialize as requested from some part of ASan runtime library (interceptors,
557// allocator, etc).
558void AsanInitFromRtl() {
559  AsanInitInternal();
560}
561
562#if ASAN_DYNAMIC
563// Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
564// (and thus normal initializers from .preinit_array or modules haven't run).
565
566class AsanInitializer {
567public:  // NOLINT
568  AsanInitializer() {
569    AsanInitFromRtl();
570  }
571};
572
573static AsanInitializer asan_initializer;
574#endif  // ASAN_DYNAMIC
575
576} // namespace __asan
577
578// ---------------------- Interface ---------------- {{{1
579using namespace __asan;  // NOLINT
580
581void NOINLINE __asan_handle_no_return() {
582  int local_stack;
583  AsanThread *curr_thread = GetCurrentThread();
584  uptr PageSize = GetPageSizeCached();
585  uptr top, bottom;
586  if (curr_thread) {
587    top = curr_thread->stack_top();
588    bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
589  } else {
590    // If we haven't seen this thread, try asking the OS for stack bounds.
591    uptr tls_addr, tls_size, stack_size;
592    GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
593                         &tls_size);
594    top = bottom + stack_size;
595  }
596  static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
597  if (top - bottom > kMaxExpectedCleanupSize) {
598    static bool reported_warning = false;
599    if (reported_warning)
600      return;
601    reported_warning = true;
602    Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
603           "stack top: %p; bottom %p; size: %p (%zd)\n"
604           "False positive error reports may follow\n"
605           "For details see "
606           "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n",
607           top, bottom, top - bottom, top - bottom);
608    return;
609  }
610  PoisonShadow(bottom, top - bottom, 0);
611  if (curr_thread && curr_thread->has_fake_stack())
612    curr_thread->fake_stack()->HandleNoReturn();
613}
614
615void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
616  SetUserDieCallback(callback);
617}
618
619// Initialize as requested from instrumented application code.
620// We use this call as a trigger to wake up ASan from deactivated state.
621void __asan_init() {
622  AsanActivate();
623  AsanInitInternal();
624}
625
626void __asan_version_mismatch_check() {
627  // Do nothing.
628}
629