sanitizer_posix.cc revision d7e5bb4043adf4756e6f8cfe0f5a3165b185474d 
1//===-- sanitizer_posix.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 shared between AddressSanitizer and ThreadSanitizer
11// run-time libraries and implements POSIX-specific functions from
12// sanitizer_libc.h.
13//===----------------------------------------------------------------------===//
14#if defined(__linux__) || defined(__APPLE__)
15
16#include "sanitizer_common.h"
17#include "sanitizer_libc.h"
18#include "sanitizer_procmaps.h"
19
20#include <errno.h>
21#include <pthread.h>
22#include <stdarg.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/mman.h>
27#include <sys/resource.h>
28#include <sys/time.h>
29#include <sys/types.h>
30#include <unistd.h>
31
32namespace __sanitizer {
33
34// ------------- sanitizer_common.h
35
36int GetPid() {
37  return getpid();
38}
39
40uptr GetThreadSelf() {
41  return (uptr)pthread_self();
42}
43
44void *MmapOrDie(uptr size, const char *mem_type) {
45  size = RoundUpTo(size, kPageSize);
46  void *res = internal_mmap(0, size,
47                            PROT_READ | PROT_WRITE,
48                            MAP_PRIVATE | MAP_ANON, -1, 0);
49  if (res == (void*)-1) {
50    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
51           size, size, mem_type, strerror(errno));
52    DumpProcessMap();
53    CHECK("unable to mmap" && 0);
54  }
55  return res;
56}
57
58void UnmapOrDie(void *addr, uptr size) {
59  if (!addr || !size) return;
60  int res = internal_munmap(addr, size);
61  if (res != 0) {
62    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
63           size, size, addr);
64    CHECK("unable to unmap" && 0);
65  }
66}
67
68void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
69  return internal_mmap((void*)fixed_addr, size,
70                      PROT_READ | PROT_WRITE,
71                      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
72                      -1, 0);
73}
74
75void *Mprotect(uptr fixed_addr, uptr size) {
76  return internal_mmap((void*)fixed_addr, size,
77                       PROT_NONE,
78                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
79                       -1, 0);
80}
81
82void *MapFileToMemory(const char *file_name, uptr *buff_size) {
83  fd_t fd = internal_open(file_name, false);
84  CHECK_NE(fd, kInvalidFd);
85  uptr fsize = internal_filesize(fd);
86  CHECK_NE(fsize, (uptr)-1);
87  CHECK_GT(fsize, 0);
88  *buff_size = RoundUpTo(fsize, kPageSize);
89  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
90  return (map == MAP_FAILED) ? 0 : map;
91}
92
93
94static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
95                                        uptr start2, uptr end2) {
96  CHECK(start1 <= end1);
97  CHECK(start2 <= end2);
98  return (end1 < start2) || (end2 < start1);
99}
100
101// FIXME: this is thread-unsafe, but should not cause problems most of the time.
102// When the shadow is mapped only a single thread usually exists (plus maybe
103// several worker threads on Mac, which aren't expected to map big chunks of
104// memory).
105bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
106  MemoryMappingLayout procmaps;
107  uptr start, end;
108  while (procmaps.Next(&start, &end,
109                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
110    if (!IntervalsAreSeparate(start, end, range_start, range_end))
111      return false;
112  }
113  return true;
114}
115
116void DumpProcessMap() {
117  MemoryMappingLayout proc_maps;
118  uptr start, end;
119  const sptr kBufSize = 4095;
120  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
121  Report("Process memory map follows:\n");
122  while (proc_maps.Next(&start, &end, /* file_offset */0,
123                        filename, kBufSize)) {
124    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
125  }
126  Report("End of process memory map.\n");
127  UnmapOrDie(filename, kBufSize);
128}
129
130const char *GetPwd() {
131  return GetEnv("PWD");
132}
133
134void DisableCoreDumper() {
135  struct rlimit nocore;
136  nocore.rlim_cur = 0;
137  nocore.rlim_max = 0;
138  setrlimit(RLIMIT_CORE, &nocore);
139}
140
141bool StackSizeIsUnlimited() {
142  struct rlimit rlim;
143  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
144  return (rlim.rlim_cur == (uptr)-1);
145}
146
147void SetStackSizeLimitInBytes(uptr limit) {
148  struct rlimit rlim;
149  rlim.rlim_cur = limit;
150  rlim.rlim_max = limit;
151  CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
152  CHECK(!StackSizeIsUnlimited());
153}
154
155void SleepForSeconds(int seconds) {
156  sleep(seconds);
157}
158
159void SleepForMillis(int millis) {
160  usleep(millis * 1000);
161}
162
163void Exit(int exitcode) {
164  _exit(exitcode);
165}
166
167void Abort() {
168  abort();
169}
170
171int Atexit(void (*function)(void)) {
172#ifndef SANITIZER_GO
173  return atexit(function);
174#else
175  return 0;
176#endif
177}
178
179}  // namespace __sanitizer
180
181#endif  // __linux__ || __APPLE_
182