asan_posix.cc revision e1fe0fd868886b53cb8d5d957afebbdd47688df7 
1//===-- asan_linux.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// Posix-specific details.
13//===----------------------------------------------------------------------===//
14#if defined(__linux__) || defined(__APPLE__)
15
16#include "asan_internal.h"
17#include "asan_interceptors.h"
18#include "asan_stack.h"
19#include "asan_thread_registry.h"
20
21#include <pthread.h>
22#include <signal.h>
23#include <sys/time.h>
24#include <sys/resource.h>
25#include <unistd.h>
26
27#ifdef ANDROID
28#include <sys/atomics.h>
29#endif
30
31namespace __asan {
32
33static void MaybeInstallSigaction(int signum,
34                                  void (*handler)(int, siginfo_t *, void *)) {
35  if (!AsanInterceptsSignal(signum))
36    return;
37  struct sigaction sigact;
38  REAL(memset)(&sigact, 0, sizeof(sigact));
39  sigact.sa_sigaction = handler;
40  sigact.sa_flags = SA_SIGINFO;
41  CHECK(0 == REAL(sigaction)(signum, &sigact, 0));
42}
43
44static void     ASAN_OnSIGSEGV(int, siginfo_t *siginfo, void *context) {
45  uintptr_t addr = (uintptr_t)siginfo->si_addr;
46  // Write the first message using the bullet-proof write.
47  if (13 != AsanWrite(2, "ASAN:SIGSEGV\n", 13)) AsanDie();
48  uintptr_t pc, sp, bp;
49  GetPcSpBp(context, &pc, &sp, &bp);
50  Report("ERROR: AddressSanitizer crashed on unknown address %p"
51         " (pc %p sp %p bp %p T%d)\n",
52         addr, pc, sp, bp,
53         asanThreadRegistry().GetCurrentTidOrMinusOne());
54  Printf("AddressSanitizer can not provide additional info. ABORTING\n");
55  GET_STACK_TRACE_WITH_PC_AND_BP(kStackTraceMax, pc, bp);
56  stack.PrintStack();
57  ShowStatsAndAbort();
58}
59
60void InstallSignalHandlers() {
61  MaybeInstallSigaction(SIGSEGV, ASAN_OnSIGSEGV);
62  MaybeInstallSigaction(SIGBUS, ASAN_OnSIGSEGV);
63}
64
65void AsanDisableCoreDumper() {
66  struct rlimit nocore;
67  nocore.rlim_cur = 0;
68  nocore.rlim_max = 0;
69  setrlimit(RLIMIT_CORE, &nocore);
70}
71
72int GetPid() {
73  return getpid();
74}
75
76uintptr_t GetThreadSelf() {
77  return (uintptr_t)pthread_self();
78}
79
80void SleepForSeconds(int seconds) {
81  sleep(seconds);
82}
83
84void Exit(int exitcode) {
85  return _exit(exitcode);
86}
87
88int AtomicInc(int *a) {
89#ifdef ANDROID
90  return __atomic_inc(a) + 1;
91#else
92  return __sync_add_and_fetch(a, 1);
93#endif
94}
95
96// ---------------------- TSD ---------------- {{{1
97
98static pthread_key_t tsd_key;
99static bool tsd_key_inited = false;
100void AsanTSDInit(void (*destructor)(void *tsd)) {
101  CHECK(!tsd_key_inited);
102  tsd_key_inited = true;
103  CHECK(0 == pthread_key_create(&tsd_key, destructor));
104}
105
106void *AsanTSDGet() {
107  CHECK(tsd_key_inited);
108  return pthread_getspecific(tsd_key);
109}
110
111void AsanTSDSet(void *tsd) {
112  CHECK(tsd_key_inited);
113  pthread_setspecific(tsd_key, tsd);
114}
115
116}  // namespace __asan
117
118#endif  // __linux__ || __APPLE_
119