1//===-- sanitizer_libignore.cpp -------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "sanitizer_platform.h"
10
11#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_APPLE || \
12 SANITIZER_NETBSD
13
14#include "sanitizer_libignore.h"
15#include "sanitizer_flags.h"
16#include "sanitizer_posix.h"
17#include "sanitizer_procmaps.h"
18
19namespace __sanitizer {
20
21LibIgnore::LibIgnore(LinkerInitialized) {
22}
23
24void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
25 Lock lock(&mutex_);
26 if (count_ >= kMaxLibs) {
27 Report(format: "%s: too many ignored libraries (max: %zu)\n", SanitizerToolName,
28 kMaxLibs);
29 Die();
30 }
31 Lib *lib = &libs_[count_++];
32 lib->templ = internal_strdup(s: name_templ);
33 lib->name = nullptr;
34 lib->real_name = nullptr;
35 lib->range_id = kInvalidCodeRangeId;
36}
37
38void LibIgnore::OnLibraryLoaded(const char *name) {
39 Lock lock(&mutex_);
40 // Try to match suppressions with symlink target.
41 InternalMmapVector<char> buf(kMaxPathLength);
42 if (name && internal_readlink(path: name, buf: buf.data(), bufsize: 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(templ: lib->templ, str: name))
48 lib->real_name = internal_strdup(s: buf.data());
49 }
50 }
51
52 // Scan suppressions list and find newly loaded and unloaded libraries.
53 ListOfModules modules;
54 modules.init();
55 for (uptr i = 0; i < count_; i++) {
56 Lib *lib = &libs_[i];
57 bool loaded = false;
58 for (const auto &mod : modules) {
59 for (const auto &range : mod.ranges()) {
60 if (!range.executable)
61 continue;
62 if (!TemplateMatch(templ: lib->templ, str: mod.full_name()) &&
63 !(lib->real_name &&
64 internal_strcmp(s1: lib->real_name, s2: mod.full_name()) == 0))
65 continue;
66 if (loaded) {
67 Report(format: "%s: called_from_lib suppression '%s' is matched against"
68 " 2 libraries: '%s' and '%s'\n",
69 SanitizerToolName, lib->templ, lib->name, mod.full_name());
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, mod.full_name());
79 lib->name = internal_strdup(s: mod.full_name());
80 const uptr idx =
81 atomic_load(a: &ignored_ranges_count_, mo: memory_order_relaxed);
82 CHECK_LT(idx, ARRAY_SIZE(ignored_code_ranges_));
83 ignored_code_ranges_[idx].OnLoad(b: range.beg, e: range.end);
84 // Record the index of the ignored range.
85 lib->range_id = idx;
86 atomic_store(a: &ignored_ranges_count_, v: idx + 1, mo: memory_order_release);
87 break;
88 }
89 }
90 if (lib->loaded() && !loaded) {
91 VReport(1,
92 "%s: library '%s' that was matched against called_from_lib"
93 " suppression '%s' is unloaded\n",
94 SanitizerToolName, lib->name, lib->templ);
95 // The library is unloaded so mark the ignored code range as unloaded.
96 ignored_code_ranges_[lib->range_id].OnUnload();
97 lib->range_id = kInvalidCodeRangeId;
98 }
99 }
100
101 // Track instrumented ranges.
102 if (track_instrumented_libs_) {
103 for (const auto &mod : modules) {
104 if (!mod.instrumented())
105 continue;
106 for (const auto &range : mod.ranges()) {
107 if (!range.executable)
108 continue;
109 if (IsPcInstrumented(pc: range.beg) && IsPcInstrumented(pc: range.end - 1))
110 continue;
111 VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
112 (void *)range.beg, (void *)range.end, mod.full_name());
113 const uptr idx =
114 atomic_load(a: &instrumented_ranges_count_, mo: memory_order_relaxed);
115 CHECK_LT(idx, ARRAY_SIZE(instrumented_code_ranges_));
116 instrumented_code_ranges_[idx].OnLoad(b: range.beg, e: range.end);
117 atomic_store(a: &instrumented_ranges_count_, v: idx + 1,
118 mo: memory_order_release);
119 }
120 }
121 }
122}
123
124void LibIgnore::OnLibraryUnloaded() {
125 OnLibraryLoaded(name: nullptr);
126}
127
128} // namespace __sanitizer
129
130#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_APPLE ||
131 // SANITIZER_NETBSD
132