sanitizer_posix.cc revision d698edc4f74a17048eef3342a9fa42b3ebba802a 
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
35uptr GetPageSize() {
36  return sysconf(_SC_PAGESIZE);
37}
38
39uptr GetMmapGranularity() {
40  return GetPageSize();
41}
42
43int GetPid() {
44  return getpid();
45}
46
47uptr GetThreadSelf() {
48  return (uptr)pthread_self();
49}
50
51void *MmapOrDie(uptr size, const char *mem_type) {
52  size = RoundUpTo(size, GetPageSizeCached());
53  void *res = internal_mmap(0, size,
54                            PROT_READ | PROT_WRITE,
55                            MAP_PRIVATE | MAP_ANON, -1, 0);
56  if (res == (void*)-1) {
57    static int recursion_count;
58    if (recursion_count) {
59      // The Report() and CHECK calls below may call mmap recursively and fail.
60      // If we went into recursion, just die.
61      RawWrite("AddressSanitizer is unable to mmap\n");
62      Die();
63    }
64    recursion_count++;
65    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
66           size, size, mem_type, strerror(errno));
67    DumpProcessMap();
68    CHECK("unable to mmap" && 0);
69  }
70  return res;
71}
72
73void UnmapOrDie(void *addr, uptr size) {
74  if (!addr || !size) return;
75  int res = internal_munmap(addr, size);
76  if (res != 0) {
77    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
78           size, size, addr);
79    CHECK("unable to unmap" && 0);
80  }
81}
82
83void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
84  uptr PageSize = GetPageSizeCached();
85  void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
86      RoundUpTo(size, PageSize),
87      PROT_READ | PROT_WRITE,
88      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
89      -1, 0);
90  if (p == (void*)-1)
91    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
92           size, size, fixed_addr, errno);
93  return p;
94}
95
96void *Mprotect(uptr fixed_addr, uptr size) {
97  return internal_mmap((void*)fixed_addr, size,
98                       PROT_NONE,
99                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
100                       -1, 0);
101}
102
103void *MapFileToMemory(const char *file_name, uptr *buff_size) {
104  fd_t fd = internal_open(file_name, false);
105  CHECK_NE(fd, kInvalidFd);
106  uptr fsize = internal_filesize(fd);
107  CHECK_NE(fsize, (uptr)-1);
108  CHECK_GT(fsize, 0);
109  *buff_size = RoundUpTo(fsize, GetPageSizeCached());
110  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
111  return (map == MAP_FAILED) ? 0 : map;
112}
113
114
115static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
116                                        uptr start2, uptr end2) {
117  CHECK(start1 <= end1);
118  CHECK(start2 <= end2);
119  return (end1 < start2) || (end2 < start1);
120}
121
122// FIXME: this is thread-unsafe, but should not cause problems most of the time.
123// When the shadow is mapped only a single thread usually exists (plus maybe
124// several worker threads on Mac, which aren't expected to map big chunks of
125// memory).
126bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
127  MemoryMappingLayout procmaps;
128  uptr start, end;
129  while (procmaps.Next(&start, &end,
130                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
131    if (!IntervalsAreSeparate(start, end, range_start, range_end))
132      return false;
133  }
134  return true;
135}
136
137void DumpProcessMap() {
138  MemoryMappingLayout proc_maps;
139  uptr start, end;
140  const sptr kBufSize = 4095;
141  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
142  Report("Process memory map follows:\n");
143  while (proc_maps.Next(&start, &end, /* file_offset */0,
144                        filename, kBufSize)) {
145    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
146  }
147  Report("End of process memory map.\n");
148  UnmapOrDie(filename, kBufSize);
149}
150
151const char *GetPwd() {
152  return GetEnv("PWD");
153}
154
155void DisableCoreDumper() {
156  struct rlimit nocore;
157  nocore.rlim_cur = 0;
158  nocore.rlim_max = 0;
159  setrlimit(RLIMIT_CORE, &nocore);
160}
161
162bool StackSizeIsUnlimited() {
163  struct rlimit rlim;
164  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
165  return (rlim.rlim_cur == (uptr)-1);
166}
167
168void SetStackSizeLimitInBytes(uptr limit) {
169  struct rlimit rlim;
170  rlim.rlim_cur = limit;
171  rlim.rlim_max = limit;
172  if (setrlimit(RLIMIT_STACK, &rlim)) {
173    Report("setrlimit() failed %d\n", errno);
174    Die();
175  }
176  CHECK(!StackSizeIsUnlimited());
177}
178
179void SleepForSeconds(int seconds) {
180  sleep(seconds);
181}
182
183void SleepForMillis(int millis) {
184  usleep(millis * 1000);
185}
186
187void Exit(int exitcode) {
188  _exit(exitcode);
189}
190
191void Abort() {
192  abort();
193}
194
195int Atexit(void (*function)(void)) {
196#ifndef SANITIZER_GO
197  return atexit(function);
198#else
199  return 0;
200#endif
201}
202
203int internal_isatty(fd_t fd) {
204  return isatty(fd);
205}
206
207}  // namespace __sanitizer
208
209#endif  // __linux__ || __APPLE_
210