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
27namespace google_breakpad {
28
29bool 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", &region.start, &region.end, permissions,
68 &region.offset, &region.major_device, &region.minor_device,
69 &region.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