1 | // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
2 | // Use of this source code is governed by a BSD-style license that can be |
3 | // found in the LICENSE file. |
4 | |
5 | #ifndef __STDC_FORMAT_MACROS |
6 | #define __STDC_FORMAT_MACROS |
7 | #endif |
8 | |
9 | #include "google_breakpad/processor/proc_maps_linux.h" |
10 | |
11 | #include <fcntl.h> |
12 | #include <inttypes.h> |
13 | #include <stdio.h> |
14 | |
15 | #include "common/using_std_string.h" |
16 | #include "processor/logging.h" |
17 | |
18 | #if defined(OS_ANDROID) && !defined(__LP64__) |
19 | // In 32-bit mode, Bionic's inttypes.h defines PRI/SCNxPTR as an |
20 | // unsigned long int, which is incompatible with Bionic's stdint.h |
21 | // defining uintptr_t as an unsigned int: |
22 | // https://code.google.com/p/android/issues/detail?id=57218 |
23 | #undef SCNxPTR |
24 | #define SCNxPTR "x" |
25 | #endif |
26 | |
27 | namespace google_breakpad { |
28 | |
29 | bool ParseProcMaps(const string& input, |
30 | std::vector<MappedMemoryRegion>* regions_out) { |
31 | std::vector<MappedMemoryRegion> regions; |
32 | |
33 | // This isn't async safe nor terribly efficient, but it doesn't need to be at |
34 | // this point in time. |
35 | |
36 | // Split the string by newlines. |
37 | std::vector<string> lines; |
38 | string l = "" ; |
39 | for (size_t i = 0; i < input.size(); i++) { |
40 | if (input[i] != '\n' && input[i] != '\r') { |
41 | l.push_back(input[i]); |
42 | } else if (l.size() > 0) { |
43 | lines.push_back(l); |
44 | l.clear(); |
45 | } |
46 | } |
47 | if (l.size() > 0) { |
48 | BPLOG(ERROR) << "Input doesn't end in newline" ; |
49 | return false; |
50 | } |
51 | |
52 | for (size_t i = 0; i < lines.size(); ++i) { |
53 | MappedMemoryRegion region; |
54 | const char* line = lines[i].c_str(); |
55 | char permissions[5] = {'\0'}; // Ensure NUL-terminated string. |
56 | int path_index = 0; |
57 | |
58 | // Sample format from man 5 proc: |
59 | // |
60 | // address perms offset dev inode pathname |
61 | // 08048000-08056000 r-xp 00000000 03:0c 64593 /usr/sbin/gpm |
62 | // |
63 | // The final %n term captures the offset in the input string, which is used |
64 | // to determine the path name. It *does not* increment the return value. |
65 | // Refer to man 3 sscanf for details. |
66 | if (sscanf(line, "%" SCNx64 "-%" SCNx64 " %4c %" SCNx64" %hhx:%hhx %" |
67 | SCNd64 " %n" , ®ion.start, ®ion.end, permissions, |
68 | ®ion.offset, ®ion.major_device, ®ion.minor_device, |
69 | ®ion.inode, &path_index) < 7) { |
70 | BPLOG(ERROR) << "sscanf failed for line: " << line; |
71 | return false; |
72 | } |
73 | |
74 | region.permissions = 0; |
75 | |
76 | if (permissions[0] == 'r') |
77 | region.permissions |= MappedMemoryRegion::READ; |
78 | else if (permissions[0] != '-') |
79 | return false; |
80 | |
81 | if (permissions[1] == 'w') |
82 | region.permissions |= MappedMemoryRegion::WRITE; |
83 | else if (permissions[1] != '-') |
84 | return false; |
85 | |
86 | if (permissions[2] == 'x') |
87 | region.permissions |= MappedMemoryRegion::EXECUTE; |
88 | else if (permissions[2] != '-') |
89 | return false; |
90 | |
91 | if (permissions[3] == 'p') |
92 | region.permissions |= MappedMemoryRegion::PRIVATE; |
93 | else if (permissions[3] != 's' && permissions[3] != 'S') // Shared memory. |
94 | return false; |
95 | |
96 | // Pushing then assigning saves us a string copy. |
97 | regions.push_back(region); |
98 | regions.back().path.assign(line + path_index); |
99 | regions.back().line.assign(line); |
100 | } |
101 | |
102 | regions_out->swap(regions); |
103 | return true; |
104 | } |
105 | |
106 | } // namespace google_breakpad |
107 | |