sanitizer_libignore.cc revision 4af0f21c0c98950df1136dbec8824a029ed5bb8e 
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_procmaps.h"
15
16namespace __sanitizer {
17
18LibIgnore::LibIgnore(LinkerInitialized) {
19}
20
21void LibIgnore::Init(const SuppressionContext &supp) {
22  BlockingMutexLock lock(&mutex_);
23  CHECK_EQ(count_, 0);
24  const uptr n = supp.SuppressionCount();
25  for (uptr i = 0; i < n; i++) {
26    const Suppression *s = supp.SuppressionAt(i);
27    if (s->type != SuppressionLib)
28      continue;
29    if (count_ >= kMaxLibs) {
30      Report("%s: too many called_from_lib suppressions (max: %d)\n",
31             SanitizerToolName, kMaxLibs);
32      Die();
33    }
34    Lib *lib = &libs_[count_++];
35    lib->templ = internal_strdup(s->templ);
36    lib->name = 0;
37    lib->loaded = false;
38  }
39}
40
41void LibIgnore::OnLibraryLoaded() {
42  BlockingMutexLock lock(&mutex_);
43  MemoryMappingLayout proc_maps(/*cache_enabled*/false);
44  InternalScopedBuffer<char> fn(4096);
45  for (uptr i = 0; i < count_; i++) {
46    Lib *lib = &libs_[i];
47    bool loaded = false;
48    proc_maps.Reset();
49    uptr b, e, off, prot;
50    while (proc_maps.Next(&b, &e, &off, fn.data(), fn.size(), &prot)) {
51      if ((prot & MemoryMappingLayout::kProtectionExecute) != 0 &&
52          TemplateMatch(lib->templ, fn.data())) {
53        if (loaded) {
54          Report("%s: called_from_lib suppression '%s' is matched against"
55                 " 2 libraries: '%s' and '%s'\n",
56                 SanitizerToolName, lib->templ, lib->name, fn.data());
57          Die();
58        }
59        loaded = true;
60        if (!lib->loaded) {
61          lib->loaded = true;
62          lib->name = internal_strdup(fn.data());
63          const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
64          code_ranges_[idx].begin = b;
65          code_ranges_[idx].end = e;
66          atomic_store(&loaded_count_, idx + 1, memory_order_release);
67        }
68      }
69    }
70    if (lib->loaded && !loaded) {
71      Report("%s: library '%s' that was matched against called_from_lib"
72             " suppression '%s' is unloaded\n",
73             SanitizerToolName, lib->name, lib->templ);
74      Die();
75    }
76  }
77}
78
79void LibIgnore::OnLibraryUnloaded() {
80  OnLibraryLoaded();
81}
82
83}  // namespace __sanitizer
84
85#endif  // #if SANITIZER_LINUX
86