1 //===-- sanitizer_procmaps_linux.cc ---------------------------------------===//
2 //
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
5 //
6 //===----------------------------------------------------------------------===//
7 //
8 // Information about the process mappings (Linux-specific parts).
9 //===----------------------------------------------------------------------===//
10
11 #include "sanitizer_platform.h"
12 #if SANITIZER_LINUX
13 #include "sanitizer_common.h"
14 #include "sanitizer_procmaps.h"
15
16 namespace __sanitizer {
17
ReadProcMaps(ProcSelfMapsBuff * proc_maps)18 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
19 if (!ReadFileToBuffer("/proc/self/maps", &proc_maps->data,
20 &proc_maps->mmaped_size, &proc_maps->len)) {
21 proc_maps->data = nullptr;
22 proc_maps->mmaped_size = 0;
23 proc_maps->len = 0;
24 }
25 }
26
IsOneOf(char c,char c1,char c2)27 static bool IsOneOf(char c, char c1, char c2) {
28 return c == c1 || c == c2;
29 }
30
Next(MemoryMappedSegment * segment)31 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
32 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
33 if (data_.current >= last) return false;
34 char *next_line =
35 (char *)internal_memchr(data_.current, '\n', last - data_.current);
36 if (next_line == 0)
37 next_line = last;
38 // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
39 segment->start = ParseHex(&data_.current);
40 CHECK_EQ(*data_.current++, '-');
41 segment->end = ParseHex(&data_.current);
42 CHECK_EQ(*data_.current++, ' ');
43 CHECK(IsOneOf(*data_.current, '-', 'r'));
44 segment->protection = 0;
45 if (*data_.current++ == 'r') segment->protection |= kProtectionRead;
46 CHECK(IsOneOf(*data_.current, '-', 'w'));
47 if (*data_.current++ == 'w') segment->protection |= kProtectionWrite;
48 CHECK(IsOneOf(*data_.current, '-', 'x'));
49 if (*data_.current++ == 'x') segment->protection |= kProtectionExecute;
50 CHECK(IsOneOf(*data_.current, 's', 'p'));
51 if (*data_.current++ == 's') segment->protection |= kProtectionShared;
52 CHECK_EQ(*data_.current++, ' ');
53 segment->offset = ParseHex(&data_.current);
54 CHECK_EQ(*data_.current++, ' ');
55 ParseHex(&data_.current);
56 CHECK_EQ(*data_.current++, ':');
57 ParseHex(&data_.current);
58 CHECK_EQ(*data_.current++, ' ');
59 while (IsDecimal(*data_.current)) data_.current++;
60 // Qemu may lack the trailing space.
61 // https://github.com/google/sanitizers/issues/160
62 // CHECK_EQ(*data_.current++, ' ');
63 // Skip spaces.
64 while (data_.current < next_line && *data_.current == ' ') data_.current++;
65 // Fill in the filename.
66 if (segment->filename) {
67 uptr len =
68 Min((uptr)(next_line - data_.current), segment->filename_size - 1);
69 internal_strncpy(segment->filename, data_.current, len);
70 segment->filename[len] = 0;
71 }
72
73 data_.current = next_line + 1;
74 return true;
75 }
76
77 } // namespace __sanitizer
78
79 #endif // SANITIZER_LINUX
80