sanitizer_posix.cc revision 7dccf3f92a867f917ad19f9a6b37bcf93e64b35b 
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 <syscall.h>
31#include <unistd.h>
32
33namespace __sanitizer {
34
35// ------------- sanitizer_common.h
36
37int GetPid() {
38  return getpid();
39}
40
41int GetTid() {
42  return syscall(__NR_gettid);
43}
44
45uptr GetThreadSelf() {
46  return (uptr)pthread_self();
47}
48
49void *MmapOrDie(uptr size, const char *mem_type) {
50  size = RoundUpTo(size, kPageSize);
51  void *res = internal_mmap(0, size,
52                            PROT_READ | PROT_WRITE,
53                            MAP_PRIVATE | MAP_ANON, -1, 0);
54  if (res == (void*)-1) {
55    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
56           size, size, mem_type, strerror(errno));
57    DumpProcessMap();
58    CHECK("unable to mmap" && 0);
59  }
60  return res;
61}
62
63void UnmapOrDie(void *addr, uptr size) {
64  if (!addr || !size) return;
65  int res = internal_munmap(addr, size);
66  if (res != 0) {
67    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
68           size, size, addr);
69    CHECK("unable to unmap" && 0);
70  }
71}
72
73void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
74  return internal_mmap((void*)fixed_addr, size,
75                      PROT_READ | PROT_WRITE,
76                      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
77                      -1, 0);
78}
79
80void *Mprotect(uptr fixed_addr, uptr size) {
81  return internal_mmap((void*)fixed_addr, size,
82                       PROT_NONE,
83                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
84                       -1, 0);
85}
86
87void *MapFileToMemory(const char *file_name, uptr *buff_size) {
88  fd_t fd = internal_open(file_name, false);
89  CHECK_NE(fd, kInvalidFd);
90  uptr fsize = internal_filesize(fd);
91  CHECK_NE(fsize, (uptr)-1);
92  CHECK_GT(fsize, 0);
93  *buff_size = RoundUpTo(fsize, kPageSize);
94  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
95  return (map == MAP_FAILED) ? 0 : map;
96}
97
98
99static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
100                                        uptr start2, uptr end2) {
101  CHECK(start1 <= end1);
102  CHECK(start2 <= end2);
103  return (end1 < start2) || (end2 < start1);
104}
105
106// FIXME: this is thread-unsafe, but should not cause problems most of the time.
107// When the shadow is mapped only a single thread usually exists (plus maybe
108// several worker threads on Mac, which aren't expected to map big chunks of
109// memory).
110bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
111  MemoryMappingLayout procmaps;
112  uptr start, end;
113  while (procmaps.Next(&start, &end,
114                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
115    if (!IntervalsAreSeparate(start, end, range_start, range_end))
116      return false;
117  }
118  return true;
119}
120
121void DumpProcessMap() {
122  MemoryMappingLayout proc_maps;
123  uptr start, end;
124  const sptr kBufSize = 4095;
125  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
126  Report("Process memory map follows:\n");
127  while (proc_maps.Next(&start, &end, /* file_offset */0,
128                        filename, kBufSize)) {
129    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
130  }
131  Report("End of process memory map.\n");
132  UnmapOrDie(filename, kBufSize);
133}
134
135const char *GetPwd() {
136  return GetEnv("PWD");
137}
138
139void DisableCoreDumper() {
140  struct rlimit nocore;
141  nocore.rlim_cur = 0;
142  nocore.rlim_max = 0;
143  setrlimit(RLIMIT_CORE, &nocore);
144}
145
146bool StackSizeIsUnlimited() {
147  struct rlimit rlim;
148  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
149  return (rlim.rlim_cur == (uptr)-1);
150}
151
152void SetStackSizeLimitInBytes(uptr limit) {
153  struct rlimit rlim;
154  rlim.rlim_cur = limit;
155  rlim.rlim_max = limit;
156  CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
157  CHECK(!StackSizeIsUnlimited());
158}
159
160void SleepForSeconds(int seconds) {
161  sleep(seconds);
162}
163
164void SleepForMillis(int millis) {
165  usleep(millis * 1000);
166}
167
168void Exit(int exitcode) {
169  _exit(exitcode);
170}
171
172void Abort() {
173  abort();
174}
175
176int Atexit(void (*function)(void)) {
177#ifndef SANITIZER_GO
178  return atexit(function);
179#else
180  return 0;
181#endif
182}
183
184}  // namespace __sanitizer
185
186#endif  // __linux__ || __APPLE_
187