1//===-- sanitizer_procmaps_bsd.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
9// (FreeBSD, OpenBSD and NetBSD-specific parts).
10//===----------------------------------------------------------------------===//
11
12#include "sanitizer_platform.h"
13#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
14#include "sanitizer_common.h"
15#if SANITIZER_FREEBSD
16#include "sanitizer_freebsd.h"
17#endif
18#include "sanitizer_procmaps.h"
19
20// clang-format off
21#include <sys/types.h>
22#include <sys/sysctl.h>
23// clang-format on
24#include <unistd.h>
25#if SANITIZER_FREEBSD
26#include <sys/user.h>
27#endif
28
29#include <limits.h>
30#if SANITIZER_OPENBSD
31#define KVME_PROT_READ KVE_PROT_READ
32#define KVME_PROT_WRITE KVE_PROT_WRITE
33#define KVME_PROT_EXEC KVE_PROT_EXEC
34#endif
35
36// Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
37#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
38#include <osreldate.h>
39#if __FreeBSD_version <= 902001 // v9.2
40#define kinfo_vmentry xkinfo_vmentry
41#endif
42#endif
43
44namespace __sanitizer {
45
46void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
47  const int Mib[] = {
48#if SANITIZER_FREEBSD
49    CTL_KERN,
50    KERN_PROC,
51    KERN_PROC_VMMAP,
52    getpid()
53#elif SANITIZER_OPENBSD
54    CTL_KERN,
55    KERN_PROC_VMMAP,
56    getpid()
57#elif SANITIZER_NETBSD
58    CTL_VM,
59    VM_PROC,
60    VM_PROC_MAP,
61    getpid(),
62    sizeof(struct kinfo_vmentry)
63#else
64#error "not supported"
65#endif
66  };
67
68  uptr Size = 0;
69  int Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
70  CHECK_EQ(Err, 0);
71  CHECK_GT(Size, 0);
72
73#if !SANITIZER_OPENBSD
74  size_t MmapedSize = Size * 4 / 3;
75  void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
76  Size = MmapedSize;
77  Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
78  CHECK_EQ(Err, 0);
79  proc_maps->data = (char *)VmMap;
80#else
81  size_t PageSize = GetPageSize();
82  size_t MmapedSize = Size;
83  MmapedSize = ((MmapedSize - 1) / PageSize + 1) * PageSize;
84  char *Mem = (char *)MmapOrDie(MmapedSize, "ReadProcMaps()");
85  Size = 2 * Size + 10 * sizeof(struct kinfo_vmentry);
86  if (Size > 0x10000)
87    Size = 0x10000;
88  Size = (Size / sizeof(struct kinfo_vmentry)) * sizeof(struct kinfo_vmentry);
89  Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), Mem, &Size, NULL, 0);
90  CHECK_EQ(Err, 0);
91  MmapedSize = Size;
92  proc_maps->data = Mem;
93#endif
94
95  proc_maps->mmaped_size = MmapedSize;
96  proc_maps->len = Size;
97}
98
99bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
100  char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
101  if (data_.current >= last)
102    return false;
103  const struct kinfo_vmentry *VmEntry =
104      (const struct kinfo_vmentry *)data_.current;
105
106  segment->start = (uptr)VmEntry->kve_start;
107  segment->end = (uptr)VmEntry->kve_end;
108  segment->offset = (uptr)VmEntry->kve_offset;
109
110  segment->protection = 0;
111  if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
112    segment->protection |= kProtectionRead;
113  if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
114    segment->protection |= kProtectionWrite;
115  if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
116    segment->protection |= kProtectionExecute;
117
118#if !SANITIZER_OPENBSD
119  if (segment->filename != NULL && segment->filename_size > 0) {
120    internal_snprintf(segment->filename,
121                      Min(segment->filename_size, (uptr)PATH_MAX), "%s",
122                      VmEntry->kve_path);
123  }
124#endif
125
126#if SANITIZER_FREEBSD
127  data_.current += VmEntry->kve_structsize;
128#else
129  data_.current += sizeof(*VmEntry);
130#endif
131
132  return true;
133}
134
135} // namespace __sanitizer
136
137#endif
138