1 //===-- sanitizer_suppressions.cc -----------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Suppression parsing/matching code.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "sanitizer_suppressions.h"
15
16 #include "sanitizer_allocator_internal.h"
17 #include "sanitizer_common.h"
18 #include "sanitizer_flags.h"
19 #include "sanitizer_libc.h"
20 #include "sanitizer_placement_new.h"
21
22 namespace __sanitizer {
23
SuppressionContext(const char * suppression_types[],int suppression_types_num)24 SuppressionContext::SuppressionContext(const char *suppression_types[],
25 int suppression_types_num)
26 : suppression_types_(suppression_types),
27 suppression_types_num_(suppression_types_num), suppressions_(1),
28 can_parse_(true) {
29 CHECK_LE(suppression_types_num_, kMaxSuppressionTypes);
30 internal_memset(has_suppression_type_, 0, suppression_types_num_);
31 }
32
GetPathAssumingFileIsRelativeToExec(const char * file_path,char * new_file_path,uptr new_file_path_size)33 static bool GetPathAssumingFileIsRelativeToExec(const char *file_path,
34 /*out*/char *new_file_path,
35 uptr new_file_path_size) {
36 InternalScopedString exec(kMaxPathLength);
37 if (ReadBinaryNameCached(exec.data(), exec.size())) {
38 const char *file_name_pos = StripModuleName(exec.data());
39 uptr path_to_exec_len = file_name_pos - exec.data();
40 internal_strncat(new_file_path, exec.data(),
41 Min(path_to_exec_len, new_file_path_size - 1));
42 internal_strncat(new_file_path, file_path,
43 new_file_path_size - internal_strlen(new_file_path) - 1);
44 return true;
45 }
46 return false;
47 }
48
ParseFromFile(const char * filename)49 void SuppressionContext::ParseFromFile(const char *filename) {
50 if (filename[0] == '\0')
51 return;
52
53 // If we cannot find the file, check if its location is relative to
54 // the location of the executable.
55 InternalScopedString new_file_path(kMaxPathLength);
56 if (!FileExists(filename) && !IsAbsolutePath(filename) &&
57 GetPathAssumingFileIsRelativeToExec(filename, new_file_path.data(),
58 new_file_path.size())) {
59 filename = new_file_path.data();
60 }
61
62 // Read the file.
63 VPrintf(1, "%s: reading suppressions file at %s\n",
64 SanitizerToolName, filename);
65 char *file_contents;
66 uptr buffer_size;
67 uptr contents_size;
68 if (!ReadFileToBuffer(filename, &file_contents, &buffer_size,
69 &contents_size)) {
70 Printf("%s: failed to read suppressions file '%s'\n", SanitizerToolName,
71 filename);
72 Die();
73 }
74
75 Parse(file_contents);
76 }
77
Match(const char * str,const char * type,Suppression ** s)78 bool SuppressionContext::Match(const char *str, const char *type,
79 Suppression **s) {
80 can_parse_ = false;
81 if (!HasSuppressionType(type))
82 return false;
83 for (uptr i = 0; i < suppressions_.size(); i++) {
84 Suppression &cur = suppressions_[i];
85 if (0 == internal_strcmp(cur.type, type) && TemplateMatch(cur.templ, str)) {
86 *s = &cur;
87 return true;
88 }
89 }
90 return false;
91 }
92
StripPrefix(const char * str,const char * prefix)93 static const char *StripPrefix(const char *str, const char *prefix) {
94 while (str && *str == *prefix) {
95 str++;
96 prefix++;
97 }
98 if (!*prefix)
99 return str;
100 return 0;
101 }
102
Parse(const char * str)103 void SuppressionContext::Parse(const char *str) {
104 // Context must not mutate once Match has been called.
105 CHECK(can_parse_);
106 const char *line = str;
107 while (line) {
108 while (line[0] == ' ' || line[0] == '\t')
109 line++;
110 const char *end = internal_strchr(line, '\n');
111 if (end == 0)
112 end = line + internal_strlen(line);
113 if (line != end && line[0] != '#') {
114 const char *end2 = end;
115 while (line != end2 &&
116 (end2[-1] == ' ' || end2[-1] == '\t' || end2[-1] == '\r'))
117 end2--;
118 int type;
119 for (type = 0; type < suppression_types_num_; type++) {
120 const char *next_char = StripPrefix(line, suppression_types_[type]);
121 if (next_char && *next_char == ':') {
122 line = ++next_char;
123 break;
124 }
125 }
126 if (type == suppression_types_num_) {
127 Printf("%s: failed to parse suppressions\n", SanitizerToolName);
128 Die();
129 }
130 Suppression s;
131 s.type = suppression_types_[type];
132 s.templ = (char*)InternalAlloc(end2 - line + 1);
133 internal_memcpy(s.templ, line, end2 - line);
134 s.templ[end2 - line] = 0;
135 suppressions_.push_back(s);
136 has_suppression_type_[type] = true;
137 }
138 if (end[0] == 0)
139 break;
140 line = end + 1;
141 }
142 }
143
SuppressionCount() const144 uptr SuppressionContext::SuppressionCount() const {
145 return suppressions_.size();
146 }
147
HasSuppressionType(const char * type) const148 bool SuppressionContext::HasSuppressionType(const char *type) const {
149 for (int i = 0; i < suppression_types_num_; i++) {
150 if (0 == internal_strcmp(type, suppression_types_[i]))
151 return has_suppression_type_[i];
152 }
153 return false;
154 }
155
SuppressionAt(uptr i) const156 const Suppression *SuppressionContext::SuppressionAt(uptr i) const {
157 CHECK_LT(i, suppressions_.size());
158 return &suppressions_[i];
159 }
160
GetMatched(InternalMmapVector<Suppression * > * matched)161 void SuppressionContext::GetMatched(
162 InternalMmapVector<Suppression *> *matched) {
163 for (uptr i = 0; i < suppressions_.size(); i++)
164 if (atomic_load_relaxed(&suppressions_[i].hit_count))
165 matched->push_back(&suppressions_[i]);
166 }
167
168 } // namespace __sanitizer
169