1 //===-- sanitizer_procmaps_solaris.cpp ------------------------------------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Information about the process mappings (Solaris-specific parts).
10 //===----------------------------------------------------------------------===//
11
12 // Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
13 #undef _FILE_OFFSET_BITS
14
15 // Avoid conflict between `_TIME_BITS` defined vs. `_FILE_OFFSET_BITS`
16 // undefined in some Linux configurations.
17 #undef _TIME_BITS
18 #include "sanitizer_platform.h"
19 #if SANITIZER_SOLARIS
20 # include <fcntl.h>
21 # include <limits.h>
22 # include <procfs.h>
23
24 # include "sanitizer_common.h"
25 # include "sanitizer_procmaps.h"
26
27 namespace __sanitizer {
28
ReadProcMaps(ProcSelfMapsBuff * proc_maps)29 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
30 uptr fd = internal_open("/proc/self/xmap", O_RDONLY);
31 CHECK_NE(fd, -1);
32 uptr Size = internal_filesize(fd);
33 CHECK_GT(Size, 0);
34
35 // Allow for additional entries by following mmap.
36 size_t MmapedSize = Size * 4 / 3;
37 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
38 Size = internal_read(fd, VmMap, MmapedSize);
39 CHECK_NE(Size, -1);
40 internal_close(fd);
41 proc_maps->data = (char *)VmMap;
42 proc_maps->mmaped_size = MmapedSize;
43 proc_maps->len = Size;
44 }
45
Next(MemoryMappedSegment * segment)46 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
47 if (Error()) return false; // simulate empty maps
48 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
49 if (data_.current >= last) return false;
50
51 prxmap_t *xmapentry =
52 const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));
53
54 segment->start = (uptr)xmapentry->pr_vaddr;
55 segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);
56 segment->offset = (uptr)xmapentry->pr_offset;
57
58 segment->protection = 0;
59 if ((xmapentry->pr_mflags & MA_READ) != 0)
60 segment->protection |= kProtectionRead;
61 if ((xmapentry->pr_mflags & MA_WRITE) != 0)
62 segment->protection |= kProtectionWrite;
63 if ((xmapentry->pr_mflags & MA_EXEC) != 0)
64 segment->protection |= kProtectionExecute;
65 if ((xmapentry->pr_mflags & MA_SHARED) != 0)
66 segment->protection |= kProtectionShared;
67
68 if (segment->filename != NULL && segment->filename_size > 0) {
69 char proc_path[PATH_MAX + 1];
70
71 // Avoid unnecessary readlink on unnamed entires.
72 if (xmapentry->pr_mapname[0] == '\0')
73 segment->filename[0] = '\0';
74 else {
75 internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
76 xmapentry->pr_mapname);
77 ssize_t sz = internal_readlink(proc_path, segment->filename,
78 segment->filename_size - 1);
79
80 // If readlink failed, the map is anonymous.
81 if (sz == -1)
82 segment->filename[0] = '\0';
83 else if ((size_t)sz < segment->filename_size)
84 // readlink doesn't NUL-terminate.
85 segment->filename[sz] = '\0';
86 }
87 }
88
89 data_.current += sizeof(prxmap_t);
90
91 return true;
92 }
93
94 } // namespace __sanitizer
95
96 #endif // SANITIZER_SOLARIS
97