libsanitizer/sanitizer_common/sanitizer_libignore.cc

   1 //===-- sanitizer_libignore.cc --------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 #include "sanitizer_platform.h"
   9 #if SANITIZER_LINUX
  10
  11 #include "sanitizer_libignore.h"
  12 #include "sanitizer_flags.h"
  13 #include "sanitizer_procmaps.h"
  14
  15 namespace __sanitizer {
  16
  17 LibIgnore::LibIgnore(LinkerInitialized) {
  18 }
  19
  20 void LibIgnore::Init(const SuppressionContext &supp) {
  21   BlockingMutexLock lock(&mutex_);
  22   CHECK_EQ(count_, 0);
  23   const uptr n = supp.SuppressionCount();
  24   for (uptr i = 0; i < n; i++) {
  25     const Suppression *s = supp.SuppressionAt(i);
  26     if (s->type != SuppressionLib)
  27       continue;
  28     if (count_ >= kMaxLibs) {
  29       Report("%s: too many called_from_lib suppressions (max: %d)\n",
  30              SanitizerToolName, kMaxLibs);
  31       Die();
  32     }
  33     Lib *lib = &libs_[count_++];
  34     lib->templ = internal_strdup(s->templ);
  35     lib->name = 0;
  36     lib->loaded = false;
  37   }
  38 }
  39
  40 void LibIgnore::OnLibraryLoaded(const char *name) {
  41   BlockingMutexLock lock(&mutex_);
  42   // Try to match suppressions with symlink target.
  43   InternalScopedBuffer<char> buf(4096);
  44   if (name != 0 && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
  45       buf.data()[0]) {
  46     for (uptr i = 0; i < count_; i++) {
  47       Lib *lib = &libs_[i];
  48       if (!lib->loaded && lib->real_name == 0 &&
  49           TemplateMatch(lib->templ, name))
  50         lib->real_name = internal_strdup(buf.data());
  51     }
  52   }
  53
  54   // Scan suppressions list and find newly loaded and unloaded libraries.
  55   MemoryMappingLayout proc_maps(/*cache_enabled*/false);
  56   InternalScopedBuffer<char> module(4096);
  57   for (uptr i = 0; i < count_; i++) {
  58     Lib *lib = &libs_[i];
  59     bool loaded = false;
  60     proc_maps.Reset();
  61     uptr b, e, off, prot;
  62     while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
  63       if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
  64         continue;
  65       if (TemplateMatch(lib->templ, module.data()) ||
  66           (lib->real_name != 0 &&
  67           internal_strcmp(lib->real_name, module.data()) == 0)) {
  68         if (loaded) {
  69           Report("%s: called_from_lib suppression '%s' is matched against"
  70                  " 2 libraries: '%s' and '%s'\n",
  71                  SanitizerToolName, lib->templ, lib->name, module.data());
  72           Die();
  73         }
  74         loaded = true;
  75         if (lib->loaded)
  76           continue;
  77         VReport(1,
  78                 "Matched called_from_lib suppression '%s' against library"
  79                 " '%s'\n",
  80                 lib->templ, module.data());
  81         lib->loaded = true;
  82         lib->name = internal_strdup(module.data());
  83         const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
  84         code_ranges_[idx].begin = b;
  85         code_ranges_[idx].end = e;
  86         atomic_store(&loaded_count_, idx + 1, memory_order_release);
  87       }
  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