1 //===-- sanitizer_procmaps_bsd.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
11 // (FreeBSD, OpenBSD and NetBSD-specific parts).
12 //===----------------------------------------------------------------------===//
13
14 #include "sanitizer_platform.h"
15 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
16 #include "sanitizer_common.h"
17 #if SANITIZER_FREEBSD
18 #include "sanitizer_freebsd.h"
19 #endif
20 #include "sanitizer_procmaps.h"
21
22 // clang-format off
23 #include <sys/types.h>
24 #include <sys/sysctl.h>
25 // clang-format on
26 #include <unistd.h>
27 #if SANITIZER_FREEBSD
28 #include <sys/user.h>
29 #endif
30
31 #include <limits.h>
32 #if SANITIZER_OPENBSD
33 #define KVME_PROT_READ KVE_PROT_READ
34 #define KVME_PROT_WRITE KVE_PROT_WRITE
35 #define KVME_PROT_EXEC KVE_PROT_EXEC
36 #endif
37
38 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
39 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
40 #include <osreldate.h>
41 #if __FreeBSD_version <= 902001 // v9.2
42 #define kinfo_vmentry xkinfo_vmentry
43 #endif
44 #endif
45
46 namespace __sanitizer {
47
ReadProcMaps(ProcSelfMapsBuff * proc_maps)48 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
49 const int Mib[] = {
50 #if SANITIZER_FREEBSD
51 CTL_KERN,
52 KERN_PROC,
53 KERN_PROC_VMMAP,
54 getpid()
55 #elif SANITIZER_OPENBSD
56 CTL_KERN,
57 KERN_PROC_VMMAP,
58 getpid()
59 #elif SANITIZER_NETBSD
60 CTL_VM,
61 VM_PROC,
62 VM_PROC_MAP,
63 getpid(),
64 sizeof(struct kinfo_vmentry)
65 #else
66 #error "not supported"
67 #endif
68 };
69
70 uptr Size = 0;
71 int Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
72 CHECK_EQ(Err, 0);
73 CHECK_GT(Size, 0);
74
75 #if !SANITIZER_OPENBSD
76 size_t MmapedSize = Size * 4 / 3;
77 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
78 Size = MmapedSize;
79 Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
80 CHECK_EQ(Err, 0);
81 proc_maps->data = (char *)VmMap;
82 #else
83 size_t PageSize = GetPageSize();
84 size_t MmapedSize = Size;
85 MmapedSize = ((MmapedSize - 1) / PageSize + 1) * PageSize;
86 char *Mem = (char *)MmapOrDie(MmapedSize, "ReadProcMaps()");
87 Size = 2 * Size + 10 * sizeof(struct kinfo_vmentry);
88 if (Size > 0x10000)
89 Size = 0x10000;
90 Size = (Size / sizeof(struct kinfo_vmentry)) * sizeof(struct kinfo_vmentry);
91 Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), Mem, &Size, NULL, 0);
92 CHECK_EQ(Err, 0);
93 MmapedSize = Size;
94 proc_maps->data = Mem;
95 #endif
96
97 proc_maps->mmaped_size = MmapedSize;
98 proc_maps->len = Size;
99 }
100
Next(MemoryMappedSegment * segment)101 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
102 CHECK(!Error()); // can not fail
103 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
104 if (data_.current >= last)
105 return false;
106 const struct kinfo_vmentry *VmEntry =
107 (const struct kinfo_vmentry *)data_.current;
108
109 segment->start = (uptr)VmEntry->kve_start;
110 segment->end = (uptr)VmEntry->kve_end;
111 segment->offset = (uptr)VmEntry->kve_offset;
112
113 segment->protection = 0;
114 if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
115 segment->protection |= kProtectionRead;
116 if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
117 segment->protection |= kProtectionWrite;
118 if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
119 segment->protection |= kProtectionExecute;
120
121 #if !SANITIZER_OPENBSD
122 if (segment->filename != NULL && segment->filename_size > 0) {
123 internal_snprintf(segment->filename,
124 Min(segment->filename_size, (uptr)PATH_MAX), "%s",
125 VmEntry->kve_path);
126 }
127 #endif
128
129 #if SANITIZER_FREEBSD
130 data_.current += VmEntry->kve_structsize;
131 #else
132 data_.current += sizeof(*VmEntry);
133 #endif
134
135 return true;
136 }
137
138 } // namespace __sanitizer
139
140 #endif
141