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
  10 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC
  11
  12 #include "sanitizer_libignore.h"
  13 #include "sanitizer_flags.h"
  14 #include "sanitizer_posix.h"
  15 #include "sanitizer_procmaps.h"
  16
  17 namespace __sanitizer {
  18
  19 LibIgnore::LibIgnore(LinkerInitialized) {
  20 }
  21
  22 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
  23   BlockingMutexLock lock(&mutex_);
  24   if (count_ >= kMaxLibs) {
  25     Report("%s: too many ignored libraries (max: %d)\n", SanitizerToolName,
  26            kMaxLibs);
  27     Die();
  28   }
  29   Lib *lib = &libs_[count_++];
  30   lib->templ = internal_strdup(name_templ);
  31   lib->name = nullptr;
  32   lib->real_name = nullptr;
  33   lib->loaded = false;
  34 }
  35
  36 void LibIgnore::OnLibraryLoaded(const char *name) {
  37   BlockingMutexLock lock(&mutex_);
  38   // Try to match suppressions with symlink target.
  39   InternalScopedString buf(kMaxPathLength);
  40   if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
  41       buf[0]) {
  42     for (uptr i = 0; i < count_; i++) {
  43       Lib *lib = &libs_[i];
  44       if (!lib->loaded && (!lib->real_name) &&
  45           TemplateMatch(lib->templ, name))
  46         lib->real_name = internal_strdup(buf.data());
  47     }
  48   }
  49
  50   // Scan suppressions list and find newly loaded and unloaded libraries.
  51   MemoryMappingLayout proc_maps(/*cache_enabled*/false);
  52   InternalScopedString module(kMaxPathLength);
  53   for (uptr i = 0; i < count_; i++) {
  54     Lib *lib = &libs_[i];
  55     bool loaded = false;
  56     proc_maps.Reset();
  57     uptr b, e, off, prot;
  58     while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
  59       if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
  60         continue;
  61       if (TemplateMatch(lib->templ, module.data()) ||
  62           (lib->real_name &&
  63           internal_strcmp(lib->real_name, module.data()) == 0)) {
  64         if (loaded) {
  65           Report("%s: called_from_lib suppression '%s' is matched against"
  66                  " 2 libraries: '%s' and '%s'\n",
  67                  SanitizerToolName, lib->templ, lib->name, module.data());
  68           Die();
  69         }
  70         loaded = true;
  71         if (lib->loaded)
  72           continue;
  73         VReport(1,
  74                 "Matched called_from_lib suppression '%s' against library"
  75                 " '%s'\n",
  76                 lib->templ, module.data());
  77         lib->loaded = true;
  78         lib->name = internal_strdup(module.data());
  79         const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
  80         code_ranges_[idx].begin = b;
  81         code_ranges_[idx].end = e;
  82         atomic_store(&loaded_count_, idx + 1, memory_order_release);
  83       }
  84     }
  85     if (lib->loaded && !loaded) {
  86       Report("%s: library '%s' that was matched against called_from_lib"
  87              " suppression '%s' is unloaded\n",
  88              SanitizerToolName, lib->name, lib->templ);
  89       Die();
  90     }
  91   }
  92 }
  93
  94 void LibIgnore::OnLibraryUnloaded() {
  95   OnLibraryLoaded(nullptr);
  96 }
  97
  98 } // namespace __sanitizer
  99
 100 #endif // #if SANITIZER_FREEBSD || SANITIZER_LINUX