1 //===-- sanitizer_procmaps_bsd.cc -----------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // Information about the process mappings
10 // (FreeBSD, OpenBSD and NetBSD-specific parts).
11 //===----------------------------------------------------------------------===//
13 #include "sanitizer_platform.h"
14 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
15 #include "sanitizer_common.h"
17 #include "sanitizer_freebsd.h"
19 #include "sanitizer_procmaps.h"
22 #include <sys/types.h>
23 #include <sys/sysctl.h>
32 #define KVME_PROT_READ KVE_PROT_READ
33 #define KVME_PROT_WRITE KVE_PROT_WRITE
34 #define KVME_PROT_EXEC KVE_PROT_EXEC
37 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
38 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
39 #include <osreldate.h>
40 #if __FreeBSD_version <= 902001 // v9.2
41 #define kinfo_vmentry xkinfo_vmentry
45 namespace __sanitizer {
47 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
54 #elif SANITIZER_OPENBSD
58 #elif SANITIZER_NETBSD
63 sizeof(struct kinfo_vmentry)
65 #error "not supported"
70 int Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
74 #if !SANITIZER_OPENBSD
75 size_t MmapedSize = Size * 4 / 3;
76 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
78 Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
80 proc_maps->data = (char *)VmMap;
82 size_t PageSize = GetPageSize();
83 size_t MmapedSize = Size;
84 MmapedSize = ((MmapedSize - 1) / PageSize + 1) * PageSize;
85 char *Mem = (char *)MmapOrDie(MmapedSize, "ReadProcMaps()");
86 Size = 2 * Size + 10 * sizeof(struct kinfo_vmentry);
89 Size = (Size / sizeof(struct kinfo_vmentry)) * sizeof(struct kinfo_vmentry);
90 Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), Mem, &Size, NULL, 0);
93 proc_maps->data = Mem;
96 proc_maps->mmaped_size = MmapedSize;
97 proc_maps->len = Size;
100 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
101 CHECK(!Error()); // can not fail
102 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
103 if (data_.current >= last)
105 const struct kinfo_vmentry *VmEntry =
106 (const struct kinfo_vmentry *)data_.current;
108 segment->start = (uptr)VmEntry->kve_start;
109 segment->end = (uptr)VmEntry->kve_end;
110 segment->offset = (uptr)VmEntry->kve_offset;
112 segment->protection = 0;
113 if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
114 segment->protection |= kProtectionRead;
115 if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
116 segment->protection |= kProtectionWrite;
117 if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
118 segment->protection |= kProtectionExecute;
120 #if !SANITIZER_OPENBSD
121 if (segment->filename != NULL && segment->filename_size > 0) {
122 internal_snprintf(segment->filename,
123 Min(segment->filename_size, (uptr)PATH_MAX), "%s",
128 #if SANITIZER_FREEBSD
129 data_.current += VmEntry->kve_structsize;
131 data_.current += sizeof(*VmEntry);
137 } // namespace __sanitizer