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
19namespace __sanitizer {
20
21LibIgnore::LibIgnore(LinkerInitialized) {
22}
23
24void 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
38void 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
96void LibIgnore::OnLibraryUnloaded() {
97  OnLibraryLoaded(nullptr);
98}
99
100} // namespace __sanitizer
101
102#endif // #if SANITIZER_FREEBSD || SANITIZER_LINUX
103