sanitizer_posix.cc revision 6b641c5e63be45a03f96346886d27c4b4135ddaf 
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    static int recursion_count;
51    if (recursion_count) {
52      // The Report() and CHECK calls below may call mmap recursively and fail.
53      // If we went into recursion, just die.
54      RawWrite("AddressSanitizer is unable to mmap\n");
55      Die();
56    }
57    recursion_count++;
58    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
59           size, size, mem_type, strerror(errno));
60    DumpProcessMap();
61    CHECK("unable to mmap" && 0);
62  }
63  return res;
64}
65
66void UnmapOrDie(void *addr, uptr size) {
67  if (!addr || !size) return;
68  int res = internal_munmap(addr, size);
69  if (res != 0) {
70    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
71           size, size, addr);
72    CHECK("unable to unmap" && 0);
73  }
74}
75
76void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
77  void *p = internal_mmap((void*)(fixed_addr & ~(kPageSize - 1)),
78      RoundUpTo(size, kPageSize),
79      PROT_READ | PROT_WRITE,
80      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
81      -1, 0);
82  if (p == (void*)-1)
83    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
84           size, size, fixed_addr, errno);
85  return p;
86}
87
88void *Mprotect(uptr fixed_addr, uptr size) {
89  return internal_mmap((void*)fixed_addr, size,
90                       PROT_NONE,
91                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
92                       -1, 0);
93}
94
95void *MapFileToMemory(const char *file_name, uptr *buff_size) {
96  fd_t fd = internal_open(file_name, false);
97  CHECK_NE(fd, kInvalidFd);
98  uptr fsize = internal_filesize(fd);
99  CHECK_NE(fsize, (uptr)-1);
100  CHECK_GT(fsize, 0);
101  *buff_size = RoundUpTo(fsize, kPageSize);
102  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
103  return (map == MAP_FAILED) ? 0 : map;
104}
105
106
107static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
108                                        uptr start2, uptr end2) {
109  CHECK(start1 <= end1);
110  CHECK(start2 <= end2);
111  return (end1 < start2) || (end2 < start1);
112}
113
114// FIXME: this is thread-unsafe, but should not cause problems most of the time.
115// When the shadow is mapped only a single thread usually exists (plus maybe
116// several worker threads on Mac, which aren't expected to map big chunks of
117// memory).
118bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
119  MemoryMappingLayout procmaps;
120  uptr start, end;
121  while (procmaps.Next(&start, &end,
122                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
123    if (!IntervalsAreSeparate(start, end, range_start, range_end))
124      return false;
125  }
126  return true;
127}
128
129void DumpProcessMap() {
130  MemoryMappingLayout proc_maps;
131  uptr start, end;
132  const sptr kBufSize = 4095;
133  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
134  Report("Process memory map follows:\n");
135  while (proc_maps.Next(&start, &end, /* file_offset */0,
136                        filename, kBufSize)) {
137    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
138  }
139  Report("End of process memory map.\n");
140  UnmapOrDie(filename, kBufSize);
141}
142
143const char *GetPwd() {
144  return GetEnv("PWD");
145}
146
147void DisableCoreDumper() {
148  struct rlimit nocore;
149  nocore.rlim_cur = 0;
150  nocore.rlim_max = 0;
151  setrlimit(RLIMIT_CORE, &nocore);
152}
153
154bool StackSizeIsUnlimited() {
155  struct rlimit rlim;
156  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
157  return (rlim.rlim_cur == (uptr)-1);
158}
159
160void SetStackSizeLimitInBytes(uptr limit) {
161  struct rlimit rlim;
162  rlim.rlim_cur = limit;
163  rlim.rlim_max = limit;
164  CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
165  CHECK(!StackSizeIsUnlimited());
166}
167
168void SleepForSeconds(int seconds) {
169  sleep(seconds);
170}
171
172void SleepForMillis(int millis) {
173  usleep(millis * 1000);
174}
175
176void Exit(int exitcode) {
177  _exit(exitcode);
178}
179
180void Abort() {
181  abort();
182}
183
184int Atexit(void (*function)(void)) {
185#ifndef SANITIZER_GO
186  return atexit(function);
187#else
188  return 0;
189#endif
190}
191
192int internal_isatty(fd_t fd) {
193  return isatty(fd);
194}
195
196}  // namespace __sanitizer
197
198#endif  // __linux__ || __APPLE_
199