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