1 //===-- sanitizer_libignore.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 #include "sanitizer_platform.h"
9
10 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC || \
11 SANITIZER_NETBSD || SANITIZER_OPENBSD
12
13 #include "sanitizer_libignore.h"
14 #include "sanitizer_flags.h"
15 #include "sanitizer_posix.h"
16 #include "sanitizer_procmaps.h"
17
18 namespace __sanitizer {
19
LibIgnore(LinkerInitialized)20 LibIgnore::LibIgnore(LinkerInitialized) {
21 }
22
AddIgnoredLibrary(const char * name_templ)23 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
24 BlockingMutexLock lock(&mutex_);
25 if (count_ >= kMaxLibs) {
26 Report("%s: too many ignored libraries (max: %d)\n", SanitizerToolName,
27 kMaxLibs);
28 Die();
29 }
30 Lib *lib = &libs_[count_++];
31 lib->templ = internal_strdup(name_templ);
32 lib->name = nullptr;
33 lib->real_name = nullptr;
34 lib->loaded = false;
35 }
36
OnLibraryLoaded(const char * name)37 void LibIgnore::OnLibraryLoaded(const char *name) {
38 BlockingMutexLock lock(&mutex_);
39 // Try to match suppressions with symlink target.
40 InternalScopedString buf(kMaxPathLength);
41 if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
42 buf[0]) {
43 for (uptr i = 0; i < count_; i++) {
44 Lib *lib = &libs_[i];
45 if (!lib->loaded && (!lib->real_name) &&
46 TemplateMatch(lib->templ, name))
47 lib->real_name = internal_strdup(buf.data());
48 }
49 }
50
51 // Scan suppressions list and find newly loaded and unloaded libraries.
52 ListOfModules modules;
53 modules.init();
54 for (uptr i = 0; i < count_; i++) {
55 Lib *lib = &libs_[i];
56 bool loaded = false;
57 for (const auto &mod : modules) {
58 for (const auto &range : mod.ranges()) {
59 if (!range.executable)
60 continue;
61 if (!TemplateMatch(lib->templ, mod.full_name()) &&
62 !(lib->real_name &&
63 internal_strcmp(lib->real_name, mod.full_name()) == 0))
64 continue;
65 if (loaded) {
66 Report("%s: called_from_lib suppression '%s' is matched against"
67 " 2 libraries: '%s' and '%s'\n",
68 SanitizerToolName, lib->templ, lib->name, mod.full_name());
69 Die();
70 }
71 loaded = true;
72 if (lib->loaded)
73 continue;
74 VReport(1,
75 "Matched called_from_lib suppression '%s' against library"
76 " '%s'\n",
77 lib->templ, mod.full_name());
78 lib->loaded = true;
79 lib->name = internal_strdup(mod.full_name());
80 const uptr idx =
81 atomic_load(&ignored_ranges_count_, memory_order_relaxed);
82 CHECK_LT(idx, ARRAY_SIZE(ignored_code_ranges_));
83 ignored_code_ranges_[idx].begin = range.beg;
84 ignored_code_ranges_[idx].end = range.end;
85 atomic_store(&ignored_ranges_count_, idx + 1, memory_order_release);
86 break;
87 }
88 }
89 if (lib->loaded && !loaded) {
90 Report("%s: library '%s' that was matched against called_from_lib"
91 " suppression '%s' is unloaded\n",
92 SanitizerToolName, lib->name, lib->templ);
93 Die();
94 }
95 }
96
97 // Track instrumented ranges.
98 if (track_instrumented_libs_) {
99 for (const auto &mod : modules) {
100 if (!mod.instrumented())
101 continue;
102 for (const auto &range : mod.ranges()) {
103 if (!range.executable)
104 continue;
105 if (IsPcInstrumented(range.beg) && IsPcInstrumented(range.end - 1))
106 continue;
107 VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
108 range.beg, range.end, mod.full_name());
109 const uptr idx =
110 atomic_load(&instrumented_ranges_count_, memory_order_relaxed);
111 CHECK_LT(idx, ARRAY_SIZE(instrumented_code_ranges_));
112 instrumented_code_ranges_[idx].begin = range.beg;
113 instrumented_code_ranges_[idx].end = range.end;
114 atomic_store(&instrumented_ranges_count_, idx + 1,
115 memory_order_release);
116 }
117 }
118 }
119 }
120
OnLibraryUnloaded()121 void LibIgnore::OnLibraryUnloaded() {
122 OnLibraryLoaded(nullptr);
123 }
124
125 } // namespace __sanitizer
126
127 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC ||
128 // SANITIZER_NETBSD
129