1//===-- sanitizer_procmaps_solaris.cpp ------------------------------------===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8//
 9// Information about the process mappings (Solaris-specific parts).
10//===----------------------------------------------------------------------===//
11
12// Avoid conflict between `_TIME_BITS` defined vs. `_FILE_OFFSET_BITS`
13// undefined in some Linux configurations.
14#undef _TIME_BITS
15#include "sanitizer_platform.h"
16#if SANITIZER_SOLARIS
17#  include <fcntl.h>
18#  include <limits.h>
19#  include <procfs.h>
20
21#  include "sanitizer_common.h"
22#  include "sanitizer_procmaps.h"
23
24namespace __sanitizer {
25
26void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
27  uptr fd = internal_open("/proc/self/xmap", O_RDONLY);
28  CHECK_NE(fd, -1);
29  uptr Size = internal_filesize(fd);
30  CHECK_GT(Size, 0);
31
32  // Allow for additional entries by following mmap.
33  size_t MmapedSize = Size * 4 / 3;
34  void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
35  Size = internal_read(fd, VmMap, MmapedSize);
36  CHECK_NE(Size, -1);
37  internal_close(fd);
38  proc_maps->data = (char *)VmMap;
39  proc_maps->mmaped_size = MmapedSize;
40  proc_maps->len = Size;
41}
42
43bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
44  if (Error()) return false; // simulate empty maps
45  char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
46  if (data_.current >= last) return false;
47
48  prxmap_t *xmapentry =
49      const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));
50
51  segment->start = (uptr)xmapentry->pr_vaddr;
52  segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);
53  segment->offset = (uptr)xmapentry->pr_offset;
54
55  segment->protection = 0;
56  if ((xmapentry->pr_mflags & MA_READ) != 0)
57    segment->protection |= kProtectionRead;
58  if ((xmapentry->pr_mflags & MA_WRITE) != 0)
59    segment->protection |= kProtectionWrite;
60  if ((xmapentry->pr_mflags & MA_EXEC) != 0)
61    segment->protection |= kProtectionExecute;
62  if ((xmapentry->pr_mflags & MA_SHARED) != 0)
63    segment->protection |= kProtectionShared;
64
65  if (segment->filename != NULL && segment->filename_size > 0) {
66    char proc_path[PATH_MAX + 1];
67
68    // Avoid unnecessary readlink on unnamed entires.
69    if (xmapentry->pr_mapname[0] == '\0')
70      segment->filename[0] = '\0';
71    else {
72      internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
73                        xmapentry->pr_mapname);
74      ssize_t sz = internal_readlink(proc_path, segment->filename,
75                                     segment->filename_size - 1);
76
77      // If readlink failed, the map is anonymous.
78      if (sz == -1)
79        segment->filename[0] = '\0';
80      else if ((size_t)sz < segment->filename_size)
81        // readlink doesn't NUL-terminate.
82        segment->filename[sz] = '\0';
83    }
84  }
85
86  data_.current += sizeof(prxmap_t);
87
88  return true;
89}
90
91}  // namespace __sanitizer
92
93#endif  // SANITIZER_SOLARIS