sanitizer_libignore.cc revision e6f3247020e4710eda6fb210c9fa3c56647b4ca6 
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#if SANITIZER_LINUX
12
13#include "sanitizer_libignore.h"
14#include "sanitizer_flags.h"
15#include "sanitizer_procmaps.h"
16
17namespace __sanitizer {
18
19LibIgnore::LibIgnore(LinkerInitialized) {
20}
21
22void LibIgnore::Init(const SuppressionContext &supp) {
23  BlockingMutexLock lock(&mutex_);
24  CHECK_EQ(count_, 0);
25  const uptr n = supp.SuppressionCount();
26  for (uptr i = 0; i < n; i++) {
27    const Suppression *s = supp.SuppressionAt(i);
28    if (s->type != SuppressionLib)
29      continue;
30    if (count_ >= kMaxLibs) {
31      Report("%s: too many called_from_lib suppressions (max: %d)\n",
32             SanitizerToolName, kMaxLibs);
33      Die();
34    }
35    Lib *lib = &libs_[count_++];
36    lib->templ = internal_strdup(s->templ);
37    lib->name = 0;
38    lib->loaded = false;
39  }
40}
41
42void LibIgnore::OnLibraryLoaded(const char *name) {
43  BlockingMutexLock lock(&mutex_);
44  // Try to match suppressions with symlink target.
45  InternalScopedBuffer<char> buf(4096);
46  if (name != 0 && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
47      buf.data()[0]) {
48    for (uptr i = 0; i < count_; i++) {
49      Lib *lib = &libs_[i];
50      if (!lib->loaded && lib->real_name == 0 &&
51          TemplateMatch(lib->templ, name))
52        lib->real_name = internal_strdup(buf.data());
53    }
54  }
55
56  // Scan suppressions list and find newly loaded and unloaded libraries.
57  MemoryMappingLayout proc_maps(/*cache_enabled*/false);
58  InternalScopedBuffer<char> module(4096);
59  for (uptr i = 0; i < count_; i++) {
60    Lib *lib = &libs_[i];
61    bool loaded = false;
62    proc_maps.Reset();
63    uptr b, e, off, prot;
64    while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
65      if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
66        continue;
67      if (TemplateMatch(lib->templ, module.data()) ||
68          (lib->real_name != 0 &&
69          internal_strcmp(lib->real_name, module.data()) == 0)) {
70        if (loaded) {
71          Report("%s: called_from_lib suppression '%s' is matched against"
72                 " 2 libraries: '%s' and '%s'\n",
73                 SanitizerToolName, lib->templ, lib->name, module.data());
74          Die();
75        }
76        loaded = true;
77        if (lib->loaded)
78          continue;
79        if (common_flags()->verbosity)
80          Report("Matched called_from_lib suppression '%s' against library"
81              " '%s'\n", lib->templ, module.data());
82        lib->loaded = true;
83        lib->name = internal_strdup(module.data());
84        const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
85        code_ranges_[idx].begin = b;
86        code_ranges_[idx].end = e;
87        atomic_store(&loaded_count_, idx + 1, memory_order_release);
88      }
89    }
90    if (lib->loaded && !loaded) {
91      Report("%s: library '%s' that was matched against called_from_lib"
92             " suppression '%s' is unloaded\n",
93             SanitizerToolName, lib->name, lib->templ);
94      Die();
95    }
96  }
97}
98
99void LibIgnore::OnLibraryUnloaded() {
100  OnLibraryLoaded(0);
101}
102
103}  // namespace __sanitizer
104
105#endif  // #if SANITIZER_LINUX
106