sanitizer_posix.cc revision 04a2281586c2dafaa523d4e8dc5488b52e44194e 
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 <sys/mman.h>
24
25namespace __sanitizer {
26
27// ------------- sanitizer_common.h
28uptr GetMmapGranularity() {
29  return GetPageSize();
30}
31
32void *MmapOrDie(uptr size, const char *mem_type) {
33  size = RoundUpTo(size, GetPageSizeCached());
34  uptr res = internal_mmap(0, size,
35                            PROT_READ | PROT_WRITE,
36                            MAP_PRIVATE | MAP_ANON, -1, 0);
37  int reserrno;
38  if (internal_iserror(res, &reserrno)) {
39    static int recursion_count;
40    if (recursion_count) {
41      // The Report() and CHECK calls below may call mmap recursively and fail.
42      // If we went into recursion, just die.
43      RawWrite("ERROR: Failed to mmap\n");
44      Die();
45    }
46    recursion_count++;
47    Report("ERROR: %s failed to allocate 0x%zx (%zd) bytes of %s: %d\n",
48           SanitizerToolName, size, size, mem_type, reserrno);
49    DumpProcessMap();
50    CHECK("unable to mmap" && 0);
51  }
52  return (void *)res;
53}
54
55void UnmapOrDie(void *addr, uptr size) {
56  if (!addr || !size) return;
57  uptr res = internal_munmap(addr, size);
58  if (internal_iserror(res)) {
59    Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
60           SanitizerToolName, size, size, addr);
61    CHECK("unable to unmap" && 0);
62  }
63}
64
65void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
66  uptr PageSize = GetPageSizeCached();
67  uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
68      RoundUpTo(size, PageSize),
69      PROT_READ | PROT_WRITE,
70      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
71      -1, 0);
72  int reserrno;
73  if (internal_iserror(p, &reserrno))
74    Report("ERROR: "
75           "%s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
76           SanitizerToolName, size, size, fixed_addr, reserrno);
77  return (void *)p;
78}
79
80void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
81  uptr PageSize = GetPageSizeCached();
82  uptr p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
83      RoundUpTo(size, PageSize),
84      PROT_READ | PROT_WRITE,
85      MAP_PRIVATE | MAP_ANON | MAP_FIXED,
86      -1, 0);
87  int reserrno;
88  if (internal_iserror(p, &reserrno)) {
89    Report("ERROR:"
90           " %s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
91           SanitizerToolName, size, size, fixed_addr, reserrno);
92    CHECK("unable to mmap" && 0);
93  }
94  return (void *)p;
95}
96
97void *Mprotect(uptr fixed_addr, uptr size) {
98  return (void *)internal_mmap((void*)fixed_addr, size,
99                               PROT_NONE,
100                               MAP_PRIVATE | MAP_ANON | MAP_FIXED |
101                               MAP_NORESERVE, -1, 0);
102}
103
104void *MapFileToMemory(const char *file_name, uptr *buff_size) {
105  uptr openrv = OpenFile(file_name, false);
106  CHECK(!internal_iserror(openrv));
107  fd_t fd = openrv;
108  uptr fsize = internal_filesize(fd);
109  CHECK_NE(fsize, (uptr)-1);
110  CHECK_GT(fsize, 0);
111  *buff_size = RoundUpTo(fsize, GetPageSizeCached());
112  uptr map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
113  return internal_iserror(map) ? 0 : (void *)map;
114}
115
116
117static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
118                                        uptr start2, uptr end2) {
119  CHECK(start1 <= end1);
120  CHECK(start2 <= end2);
121  return (end1 < start2) || (end2 < start1);
122}
123
124// FIXME: this is thread-unsafe, but should not cause problems most of the time.
125// When the shadow is mapped only a single thread usually exists (plus maybe
126// several worker threads on Mac, which aren't expected to map big chunks of
127// memory).
128bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
129  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
130  uptr start, end;
131  while (proc_maps.Next(&start, &end,
132                        /*offset*/0, /*filename*/0, /*filename_size*/0,
133                        /*protection*/0)) {
134    if (!IntervalsAreSeparate(start, end, range_start, range_end))
135      return false;
136  }
137  return true;
138}
139
140void DumpProcessMap() {
141  MemoryMappingLayout proc_maps(/*cache_enabled*/true);
142  uptr start, end;
143  const sptr kBufSize = 4095;
144  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
145  Report("Process memory map follows:\n");
146  while (proc_maps.Next(&start, &end, /* file_offset */0,
147                        filename, kBufSize, /* protection */0)) {
148    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
149  }
150  Report("End of process memory map.\n");
151  UnmapOrDie(filename, kBufSize);
152}
153
154const char *GetPwd() {
155  return GetEnv("PWD");
156}
157
158}  // namespace __sanitizer
159
160#endif  // SANITIZER_LINUX || SANITIZER_MAC
161