1 //===-- sanitizer_libignore.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 #include "sanitizer_platform.h"
11
12 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC
13
14 #include "sanitizer_libignore.h"
15 #include "sanitizer_flags.h"
16 #include "sanitizer_posix.h"
17 #include "sanitizer_procmaps.h"
18
19 namespace __sanitizer {
20
LibIgnore(LinkerInitialized)21 LibIgnore::LibIgnore(LinkerInitialized) {
22 }
23
AddIgnoredLibrary(const char * name_templ)24 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
25 BlockingMutexLock lock(&mutex_);
26 if (count_ >= kMaxLibs) {
27 Report("%s: too many ignored libraries (max: %d)\n", SanitizerToolName,
28 kMaxLibs);
29 Die();
30 }
31 Lib *lib = &libs_[count_++];
32 lib->templ = internal_strdup(name_templ);
33 lib->name = nullptr;
34 lib->real_name = nullptr;
35 lib->loaded = false;
36 }
37
OnLibraryLoaded(const char * name)38 void LibIgnore::OnLibraryLoaded(const char *name) {
39 BlockingMutexLock lock(&mutex_);
40 // Try to match suppressions with symlink target.
41 InternalScopedString buf(kMaxPathLength);
42 if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
43 buf[0]) {
44 for (uptr i = 0; i < count_; i++) {
45 Lib *lib = &libs_[i];
46 if (!lib->loaded && (!lib->real_name) &&
47 TemplateMatch(lib->templ, name))
48 lib->real_name = internal_strdup(buf.data());
49 }
50 }
51
52 // Scan suppressions list and find newly loaded and unloaded libraries.
53 MemoryMappingLayout proc_maps(/*cache_enabled*/false);
54 InternalScopedString module(kMaxPathLength);
55 for (uptr i = 0; i < count_; i++) {
56 Lib *lib = &libs_[i];
57 bool loaded = false;
58 proc_maps.Reset();
59 uptr b, e, off, prot;
60 while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
61 if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
62 continue;
63 if (TemplateMatch(lib->templ, module.data()) ||
64 (lib->real_name &&
65 internal_strcmp(lib->real_name, module.data()) == 0)) {
66 if (loaded) {
67 Report("%s: called_from_lib suppression '%s' is matched against"
68 " 2 libraries: '%s' and '%s'\n",
69 SanitizerToolName, lib->templ, lib->name, module.data());
70 Die();
71 }
72 loaded = true;
73 if (lib->loaded)
74 continue;
75 VReport(1,
76 "Matched called_from_lib suppression '%s' against library"
77 " '%s'\n",
78 lib->templ, module.data());
79 lib->loaded = true;
80 lib->name = internal_strdup(module.data());
81 const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
82 code_ranges_[idx].begin = b;
83 code_ranges_[idx].end = e;
84 atomic_store(&loaded_count_, idx + 1, memory_order_release);
85 }
86 }
87 if (lib->loaded && !loaded) {
88 Report("%s: library '%s' that was matched against called_from_lib"
89 " suppression '%s' is unloaded\n",
90 SanitizerToolName, lib->name, lib->templ);
91 Die();
92 }
93 }
94 }
95
OnLibraryUnloaded()96 void LibIgnore::OnLibraryUnloaded() {
97 OnLibraryLoaded(nullptr);
98 }
99
100 } // namespace __sanitizer
101
102 #endif // #if SANITIZER_FREEBSD || SANITIZER_LINUX
103