1//===-- sanitizer_procmaps_freebsd.cc -------------------------------------===//
2//
3// This file is distributed under the University of Illinois Open Source
4// License. See LICENSE.TXT for details.
5//
6//===----------------------------------------------------------------------===//
7//
8// Information about the process mappings (FreeBSD and NetBSD-specific parts).
9//===----------------------------------------------------------------------===//
10
11#include "sanitizer_platform.h"
12#if SANITIZER_FREEBSD || SANITIZER_NETBSD
13#include "sanitizer_common.h"
14#if SANITIZER_FREEBSD
15#include "sanitizer_freebsd.h"
16#endif
17#include "sanitizer_procmaps.h"
18
19#include <unistd.h>
20#include <sys/sysctl.h>
21#if SANITIZER_FREEBSD
22#include <sys/user.h>
23#endif
24
25// Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
26#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
27# include <osreldate.h>
28# if __FreeBSD_version <= 902001  // v9.2
29#  define kinfo_vmentry xkinfo_vmentry
30# endif
31#endif
32
33namespace __sanitizer {
34
35void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
36  const int Mib[] = {
37#if SANITIZER_FREEBSD
38    CTL_KERN,
39    KERN_PROC,
40    KERN_PROC_VMMAP,
41    getpid()
42#else
43    CTL_VM,
44    VM_PROC,
45    VM_PROC_MAP,
46    getpid(),
47    sizeof(struct kinfo_vmentry)
48#endif
49  };
50
51  size_t Size = 0;
52  int Err = sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
53  CHECK_EQ(Err, 0);
54  CHECK_GT(Size, 0);
55
56  size_t MmapedSize = Size * 4 / 3;
57  void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
58  Size = MmapedSize;
59  Err = sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
60  CHECK_EQ(Err, 0);
61
62  proc_maps->data = (char*)VmMap;
63  proc_maps->mmaped_size = MmapedSize;
64  proc_maps->len = Size;
65}
66
67bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
68  char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
69  if (data_.current >= last) return false;
70  struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry *)data_.current;
71
72  segment->start = (uptr)VmEntry->kve_start;
73  segment->end = (uptr)VmEntry->kve_end;
74  segment->offset = (uptr)VmEntry->kve_offset;
75
76  segment->protection = 0;
77  if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
78    segment->protection |= kProtectionRead;
79  if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
80    segment->protection |= kProtectionWrite;
81  if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
82    segment->protection |= kProtectionExecute;
83
84  if (segment->filename != NULL && segment->filename_size > 0) {
85    internal_snprintf(segment->filename,
86                      Min(segment->filename_size, (uptr)PATH_MAX), "%s",
87                      VmEntry->kve_path);
88  }
89
90#if SANITIZER_FREEBSD
91  data_.current += VmEntry->kve_structsize;
92#else
93  data_.current += sizeof(*VmEntry);
94#endif
95
96  return true;
97}
98
99}  // namespace __sanitizer
100
101#endif  // SANITIZER_FREEBSD || SANITIZER_NETBSD
102