xref: /freebsd/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp (revision 924226fba12cc9a228c73b956e1b7fa24c60b055)
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 "sanitizer_common.h"
17 #include "sanitizer_procmaps.h"
18 
19 #include <procfs.h>
20 #include <limits.h>
21 
22 namespace __sanitizer {
23 
24 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
25   if (!ReadFileToBuffer("/proc/self/xmap", &proc_maps->data,
26                         &proc_maps->mmaped_size, &proc_maps->len)) {
27     proc_maps->data = nullptr;
28     proc_maps->mmaped_size = 0;
29     proc_maps->len = 0;
30   }
31 }
32 
33 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
34   if (Error()) return false; // simulate empty maps
35   char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
36   if (data_.current >= last) return false;
37 
38   prxmap_t *xmapentry =
39       const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));
40 
41   segment->start = (uptr)xmapentry->pr_vaddr;
42   segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);
43   segment->offset = (uptr)xmapentry->pr_offset;
44 
45   segment->protection = 0;
46   if ((xmapentry->pr_mflags & MA_READ) != 0)
47     segment->protection |= kProtectionRead;
48   if ((xmapentry->pr_mflags & MA_WRITE) != 0)
49     segment->protection |= kProtectionWrite;
50   if ((xmapentry->pr_mflags & MA_EXEC) != 0)
51     segment->protection |= kProtectionExecute;
52 
53   if (segment->filename != NULL && segment->filename_size > 0) {
54     char proc_path[PATH_MAX + 1];
55 
56     internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
57                       xmapentry->pr_mapname);
58     ssize_t sz = internal_readlink(proc_path, segment->filename,
59                                    segment->filename_size - 1);
60 
61     // If readlink failed, the map is anonymous.
62     if (sz == -1) {
63       segment->filename[0] = '\0';
64     } else if ((size_t)sz < segment->filename_size)
65       // readlink doesn't NUL-terminate.
66       segment->filename[sz] = '\0';
67   }
68 
69   data_.current += sizeof(prxmap_t);
70 
71   return true;
72 }
73 
74 }  // namespace __sanitizer
75 
76 #endif  // SANITIZER_SOLARIS
77