sanitizer_procmaps_freebsd.cc revision 276851 
1//===-- sanitizer_procmaps_freebsd.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// Information about the process mappings (FreeBSD-specific parts).
11//===----------------------------------------------------------------------===//
12
13#include "sanitizer_platform.h"
14#if SANITIZER_FREEBSD
15#include "sanitizer_common.h"
16#include "sanitizer_freebsd.h"
17#include "sanitizer_procmaps.h"
18
19#include <unistd.h>
20#include <sys/sysctl.h>
21#include <sys/user.h>
22
23// Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
24#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
25# include <osreldate.h>
26# if __FreeBSD_version <= 902001  // v9.2
27#  define kinfo_vmentry xkinfo_vmentry
28# endif
29#endif
30
31namespace __sanitizer {
32
33void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
34  const int Mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid() };
35  size_t Size = 0;
36  int Err = sysctl(Mib, 4, NULL, &Size, NULL, 0);
37  CHECK_EQ(Err, 0);
38  CHECK_GT(Size, 0);
39
40  size_t MmapedSize = Size * 4 / 3;
41  void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
42  Size = MmapedSize;
43  Err = sysctl(Mib, 4, VmMap, &Size, NULL, 0);
44  CHECK_EQ(Err, 0);
45
46  proc_maps->data = (char*)VmMap;
47  proc_maps->mmaped_size = MmapedSize;
48  proc_maps->len = Size;
49}
50
51bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
52                               char filename[], uptr filename_size,
53                               uptr *protection) {
54  char *last = proc_self_maps_.data + proc_self_maps_.len;
55  if (current_ >= last) return false;
56  uptr dummy;
57  if (!start) start = &dummy;
58  if (!end) end = &dummy;
59  if (!offset) offset = &dummy;
60  if (!protection) protection = &dummy;
61  struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry*)current_;
62
63  *start = (uptr)VmEntry->kve_start;
64  *end = (uptr)VmEntry->kve_end;
65  *offset = (uptr)VmEntry->kve_offset;
66
67  *protection = 0;
68  if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
69    *protection |= kProtectionRead;
70  if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
71    *protection |= kProtectionWrite;
72  if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
73    *protection |= kProtectionExecute;
74
75  if (filename != NULL && filename_size > 0) {
76    internal_snprintf(filename,
77                      Min(filename_size, (uptr)PATH_MAX),
78                      "%s", VmEntry->kve_path);
79  }
80
81  current_ += VmEntry->kve_structsize;
82
83  return true;
84}
85
86}  // namespace __sanitizer
87
88#endif  // SANITIZER_FREEBSD
89