1//===-- asan_posix.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// Posix-specific details.
11//===----------------------------------------------------------------------===//
12
13#include "sanitizer_common/sanitizer_platform.h"
14#if SANITIZER_POSIX
15
16#include "asan_internal.h"
17#include "asan_interceptors.h"
18#include "asan_mapping.h"
19#include "asan_report.h"
20#include "asan_stack.h"
21#include "sanitizer_common/sanitizer_libc.h"
22#include "sanitizer_common/sanitizer_procmaps.h"
23
24#include <pthread.h>
25#include <signal.h>
26#include <stdlib.h>
27#include <sys/time.h>
28#include <sys/resource.h>
29#include <unistd.h>
30
31namespace __asan {
32
33void AsanOnSIGSEGV(int, void *siginfo, void *context) {
34  ScopedDeadlySignal signal_scope(GetCurrentThread());
35  uptr addr = (uptr)((siginfo_t*)siginfo)->si_addr;
36  int code = (int)((siginfo_t*)siginfo)->si_code;
37  // Write the first message using the bullet-proof write.
38  if (13 != internal_write(2, "ASAN:SIGSEGV\n", 13)) Die();
39  uptr pc, sp, bp;
40  GetPcSpBp(context, &pc, &sp, &bp);
41
42  // Access at a reasonable offset above SP, or slightly below it (to account
43  // for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
44  // probably a stack overflow.
45  // We also check si_code to filter out SEGV caused by something else other
46  // then hitting the guard page or unmapped memory, like, for example,
47  // unaligned memory access.
48  if (addr + 512 > sp && addr < sp + 0xFFFF &&
49      (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR))
50    ReportStackOverflow(pc, sp, bp, context, addr);
51  else
52    ReportSIGSEGV("SEGV", pc, sp, bp, context, addr);
53}
54
55// ---------------------- TSD ---------------- {{{1
56
57static pthread_key_t tsd_key;
58static bool tsd_key_inited = false;
59void AsanTSDInit(void (*destructor)(void *tsd)) {
60  CHECK(!tsd_key_inited);
61  tsd_key_inited = true;
62  CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
63}
64
65void *AsanTSDGet() {
66  CHECK(tsd_key_inited);
67  return pthread_getspecific(tsd_key);
68}
69
70void AsanTSDSet(void *tsd) {
71  CHECK(tsd_key_inited);
72  pthread_setspecific(tsd_key, tsd);
73}
74
75void PlatformTSDDtor(void *tsd) {
76  AsanThreadContext *context = (AsanThreadContext*)tsd;
77  if (context->destructor_iterations > 1) {
78    context->destructor_iterations--;
79    CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
80    return;
81  }
82  AsanThread::TSDDtor(tsd);
83}
84}  // namespace __asan
85
86#endif  // SANITIZER_POSIX
87