lib/sanitizer_common/sanitizer_libignore.cc

   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
  16 namespace __sanitizer {
  17
  18 LibIgnore::LibIgnore(LinkerInitialized) {
  19 }
  20
  21 void 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
  41 void LibIgnore::OnLibraryLoaded(const char *name) {
  42   const char *real_name = 0;
  43   InternalScopedBuffer<char> buf(4096);
  44   if (name != 0 && internal_readlink(name, buf.data(), buf.size() - 1) > 0)
  45     real_name = buf.data();
  46
  47   BlockingMutexLock lock(&mutex_);
  48   MemoryMappingLayout proc_maps(/*cache_enabled*/false);
  49   InternalScopedBuffer<char> module(4096);
  50   for (uptr i = 0; i < count_; i++) {
  51     Lib *lib = &libs_[i];
  52     bool loaded = false;
  53     proc_maps.Reset();
  54     uptr b, e, off, prot;
  55     while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
  56       if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
  57         continue;
  58       bool matched = false;
  59       bool symlink = false;
  60       if (TemplateMatch(lib->templ, module.data()))
  61         matched = true;
  62       // Resolve symlinks.
  63       if (real_name != 0 && real_name[0] != 0 &&
  64           TemplateMatch(lib->templ, name) &&
  65           internal_strcmp(real_name, module.data()) == 0) {
  66         matched = true;
  67         symlink = true;
  68       }
  69       if (!matched)
  70         continue;
  71       if (loaded) {
  72         Report("%s: called_from_lib suppression '%s' is matched against"
  73                " 2 libraries: '%s' and '%s'\n",
  74                SanitizerToolName, lib->templ, lib->name, module.data());
  75         Die();
  76       }
  77       loaded = true;
  78       if (lib->loaded)
  79         continue;
  80       lib->loaded = true;
  81       lib->name = internal_strdup(module.data());
  82       if (symlink)
  83         lib->real_name = internal_strdup(real_name);
  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     if (lib->loaded && !loaded) {
  90       Report("%s: library '%s' that was matched against called_from_lib"
  91              " suppression '%s' is unloaded\n",
  92              SanitizerToolName, lib->name, lib->templ);
  93       Die();
  94     }
  95   }
  96 }
  97
  98 void LibIgnore::OnLibraryUnloaded() {
  99   OnLibraryLoaded(0);
 100 }
 101
 102 }  // namespace __sanitizer
 103
 104 #endif  // #if SANITIZER_LINUX