sanitizer_posix.cc revision 4df343a31cf57c309cf102b9aef870458318f579 
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
15#include "sanitizer_platform.h"
16#if SANITIZER_LINUX || SANITIZER_MAC
17
18#include "sanitizer_common.h"
19#include "sanitizer_libc.h"
20#include "sanitizer_procmaps.h"
21#include "sanitizer_stacktrace.h"
22
23#include <errno.h>
24#include <pthread.h>
25#include <stdarg.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <sys/mman.h>
30#include <sys/resource.h>
31#include <sys/time.h>
32#include <sys/types.h>
33#include <unistd.h>
34
35namespace __sanitizer {
36
37// ------------- sanitizer_common.h
38uptr GetMmapGranularity() {
39  return GetPageSize();
40}
41
42u32 GetUid() {
43  return getuid();
44}
45
46uptr GetThreadSelf() {
47  return (uptr)pthread_self();
48}
49
50void *MmapOrDie(uptr size, const char *mem_type) {
51  size = RoundUpTo(size, GetPageSizeCached());
52  uptr res = internal_mmap(0, size,
53                            PROT_READ | PROT_WRITE,
54                            MAP_PRIVATE | MAP_ANON, -1, 0);
55  int reserrno;
56  if (internal_iserror(res, &reserrno)) {
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: %s failed to allocate 0x%zx (%zd) bytes of %s: %d\n",
66           SanitizerToolName, size, size, mem_type, reserrno);
67    DumpProcessMap();
68    CHECK("unable to mmap" && 0);
69  }
70  return (void *)res;
71}
72
73void UnmapOrDie(void *addr, uptr size) {
74  if (!addr || !size) return;
75  uptr res = internal_munmap(addr, size);
76  if (internal_iserror(res)) {
77    Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
78           SanitizerToolName, size, size, addr);
79    CHECK("unable to unmap" && 0);
80  }
81}
82
83void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
84  uptr PageSize = GetPageSizeCached();
85  uptr 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  int reserrno;
91  if (internal_iserror(p, &reserrno))
92    Report("ERROR: "
93           "%s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
94           SanitizerToolName, size, size, fixed_addr, reserrno);
95  return (void *)p;
96}
97
98void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
99  uptr PageSize = GetPageSizeCached();
100  uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
101      RoundUpTo(size, PageSize),
102      PROT_READ | PROT_WRITE,
103      MAP_PRIVATE | MAP_ANON | MAP_FIXED,
104      -1, 0);
105  int reserrno;
106  if (internal_iserror(p, &reserrno)) {
107    Report("ERROR:"
108           " %s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
109           SanitizerToolName, size, size, fixed_addr, reserrno);
110    CHECK("unable to mmap" && 0);
111  }
112  return (void *)p;
113}
114
115void *Mprotect(uptr fixed_addr, uptr size) {
116  return (void *)internal_mmap((void*)fixed_addr, size,
117                               PROT_NONE,
118                               MAP_PRIVATE | MAP_ANON | MAP_FIXED |
119                               MAP_NORESERVE, -1, 0);
120}
121
122void FlushUnneededShadowMemory(uptr addr, uptr size) {
123  madvise((void*)addr, size, MADV_DONTNEED);
124}
125
126void *MapFileToMemory(const char *file_name, uptr *buff_size) {
127  uptr openrv = OpenFile(file_name, false);
128  CHECK(!internal_iserror(openrv));
129  fd_t fd = openrv;
130  uptr fsize = internal_filesize(fd);
131  CHECK_NE(fsize, (uptr)-1);
132  CHECK_GT(fsize, 0);
133  *buff_size = RoundUpTo(fsize, GetPageSizeCached());
134  uptr map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
135  return internal_iserror(map) ? 0 : (void *)map;
136}
137
138
139static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
140                                        uptr start2, uptr end2) {
141  CHECK(start1 <= end1);
142  CHECK(start2 <= end2);
143  return (end1 < start2) || (end2 < start1);
144}
145
146// FIXME: this is thread-unsafe, but should not cause problems most of the time.
147// When the shadow is mapped only a single thread usually exists (plus maybe
148// several worker threads on Mac, which aren't expected to map big chunks of
149// memory).
150bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
151  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
152  uptr start, end;
153  while (proc_maps.Next(&start, &end,
154                        /*offset*/0, /*filename*/0, /*filename_size*/0,
155                        /*protection*/0)) {
156    if (!IntervalsAreSeparate(start, end, range_start, range_end))
157      return false;
158  }
159  return true;
160}
161
162void DumpProcessMap() {
163  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
164  uptr start, end;
165  const sptr kBufSize = 4095;
166  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
167  Report("Process memory map follows:\n");
168  while (proc_maps.Next(&start, &end, /* file_offset */0,
169                        filename, kBufSize, /* protection */0)) {
170    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
171  }
172  Report("End of process memory map.\n");
173  UnmapOrDie(filename, kBufSize);
174}
175
176const char *GetPwd() {
177  return GetEnv("PWD");
178}
179
180void DisableCoreDumper() {
181  struct rlimit nocore;
182  nocore.rlim_cur = 0;
183  nocore.rlim_max = 0;
184  setrlimit(RLIMIT_CORE, &nocore);
185}
186
187bool StackSizeIsUnlimited() {
188  struct rlimit rlim;
189  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
190  return (rlim.rlim_cur == (uptr)-1);
191}
192
193void SetStackSizeLimitInBytes(uptr limit) {
194  struct rlimit rlim;
195  rlim.rlim_cur = limit;
196  rlim.rlim_max = limit;
197  if (setrlimit(RLIMIT_STACK, &rlim)) {
198    Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
199    Die();
200  }
201  CHECK(!StackSizeIsUnlimited());
202}
203
204void SleepForSeconds(int seconds) {
205  sleep(seconds);
206}
207
208void SleepForMillis(int millis) {
209  usleep(millis * 1000);
210}
211
212void Abort() {
213  abort();
214}
215
216int Atexit(void (*function)(void)) {
217#ifndef SANITIZER_GO
218  return atexit(function);
219#else
220  return 0;
221#endif
222}
223
224int internal_isatty(fd_t fd) {
225  return isatty(fd);
226}
227
228#ifndef SANITIZER_GO
229void GetStackTrace(StackTrace *stack, uptr max_s, uptr pc, uptr bp,
230                   uptr stack_top, uptr stack_bottom, bool fast) {
231#if !SANITIZER_CAN_FAST_UNWIND
232  fast = false;
233#endif
234#if SANITIZER_MAC
235  // Always unwind fast on Mac.
236  (void)fast;
237#else
238  if (!fast || (stack_top == stack_bottom))
239    return stack->SlowUnwindStack(pc, max_s);
240#endif  // SANITIZER_MAC
241  stack->size = 0;
242  stack->trace[0] = pc;
243  if (max_s > 1) {
244    stack->max_size = max_s;
245    stack->FastUnwindStack(pc, bp, stack_top, stack_bottom);
246  }
247}
248#endif  // SANITIZER_GO
249
250}  // namespace __sanitizer
251
252#endif  // SANITIZER_LINUX || SANITIZER_MAC
253