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