sanitizer_posix.cc revision c8490e2a09cd415cc58fc8f3b63bebddce61c82d 
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("ERROR: Failed 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 *MmapFixedOrDie(uptr fixed_addr, uptr size) {
97  uptr PageSize = GetPageSizeCached();
98  void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
99      RoundUpTo(size, PageSize),
100      PROT_READ | PROT_WRITE,
101      MAP_PRIVATE | MAP_ANON | MAP_FIXED,
102      -1, 0);
103  if (p == (void*)-1) {
104    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
105           size, size, fixed_addr, errno);
106    CHECK("unable to mmap" && 0);
107  }
108  return p;
109}
110
111void *Mprotect(uptr fixed_addr, uptr size) {
112  return internal_mmap((void*)fixed_addr, size,
113                       PROT_NONE,
114                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
115                       -1, 0);
116}
117
118void FlushUnneededShadowMemory(uptr addr, uptr size) {
119  madvise((void*)addr, size, MADV_DONTNEED);
120}
121
122void *MapFileToMemory(const char *file_name, uptr *buff_size) {
123  fd_t fd = internal_open(file_name, false);
124  CHECK_NE(fd, kInvalidFd);
125  uptr fsize = internal_filesize(fd);
126  CHECK_NE(fsize, (uptr)-1);
127  CHECK_GT(fsize, 0);
128  *buff_size = RoundUpTo(fsize, GetPageSizeCached());
129  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
130  return (map == MAP_FAILED) ? 0 : map;
131}
132
133
134static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
135                                        uptr start2, uptr end2) {
136  CHECK(start1 <= end1);
137  CHECK(start2 <= end2);
138  return (end1 < start2) || (end2 < start1);
139}
140
141// FIXME: this is thread-unsafe, but should not cause problems most of the time.
142// When the shadow is mapped only a single thread usually exists (plus maybe
143// several worker threads on Mac, which aren't expected to map big chunks of
144// memory).
145bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
146  MemoryMappingLayout procmaps;
147  uptr start, end;
148  while (procmaps.Next(&start, &end,
149                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
150    if (!IntervalsAreSeparate(start, end, range_start, range_end))
151      return false;
152  }
153  return true;
154}
155
156void DumpProcessMap() {
157  MemoryMappingLayout proc_maps;
158  uptr start, end;
159  const sptr kBufSize = 4095;
160  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
161  Report("Process memory map follows:\n");
162  while (proc_maps.Next(&start, &end, /* file_offset */0,
163                        filename, kBufSize)) {
164    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
165  }
166  Report("End of process memory map.\n");
167  UnmapOrDie(filename, kBufSize);
168}
169
170const char *GetPwd() {
171  return GetEnv("PWD");
172}
173
174void DisableCoreDumper() {
175  struct rlimit nocore;
176  nocore.rlim_cur = 0;
177  nocore.rlim_max = 0;
178  setrlimit(RLIMIT_CORE, &nocore);
179}
180
181bool StackSizeIsUnlimited() {
182  struct rlimit rlim;
183  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
184  return (rlim.rlim_cur == (uptr)-1);
185}
186
187void SetStackSizeLimitInBytes(uptr limit) {
188  struct rlimit rlim;
189  rlim.rlim_cur = limit;
190  rlim.rlim_max = limit;
191  if (setrlimit(RLIMIT_STACK, &rlim)) {
192    Report("setrlimit() failed %d\n", errno);
193    Die();
194  }
195  CHECK(!StackSizeIsUnlimited());
196}
197
198void SleepForSeconds(int seconds) {
199  sleep(seconds);
200}
201
202void SleepForMillis(int millis) {
203  usleep(millis * 1000);
204}
205
206void Exit(int exitcode) {
207  _exit(exitcode);
208}
209
210void Abort() {
211  abort();
212}
213
214int Atexit(void (*function)(void)) {
215#ifndef SANITIZER_GO
216  return atexit(function);
217#else
218  return 0;
219#endif
220}
221
222int internal_isatty(fd_t fd) {
223  return isatty(fd);
224}
225
226}  // namespace __sanitizer
227
228#endif  // __linux__ || __APPLE_
229