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 || SANITIZER_NETBSD
  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   ListOfModules modules;
  52   modules.init();
  53   for (uptr i = 0; i < count_; i++) {
  54     Lib *lib = &libs_[i];
  55     bool loaded = false;
  56     for (const auto &mod : modules) {
  57       for (const auto &range : mod.ranges()) {
  58         if (!range.executable)
  59           continue;
  60         if (!TemplateMatch(lib->templ, mod.full_name()) &&
  61             !(lib->real_name &&
  62             internal_strcmp(lib->real_name, mod.full_name()) == 0))
  63           continue;
  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, mod.full_name());
  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, mod.full_name());
  77         lib->loaded = true;
  78         lib->name = internal_strdup(mod.full_name());
  79         const uptr idx =
  80             atomic_load(&ignored_ranges_count_, memory_order_relaxed);
  81         CHECK_LT(idx, kMaxLibs);
  82         ignored_code_ranges_[idx].begin = range.beg;
  83         ignored_code_ranges_[idx].end = range.end;
  84         atomic_store(&ignored_ranges_count_, idx + 1, memory_order_release);
  85         break;
  86       }
  87     }
  88     if (lib->loaded && !loaded) {
  89       Report("%s: library '%s' that was matched against called_from_lib"
  90              " suppression '%s' is unloaded\n",
  91              SanitizerToolName, lib->name, lib->templ);
  92       Die();
  93     }
  94   }
  95
  96   // Track instrumented ranges.
  97   if (track_instrumented_libs_) {
  98     for (const auto &mod : modules) {
  99       if (!mod.instrumented())
 100         continue;
 101       for (const auto &range : mod.ranges()) {
 102         if (!range.executable)
 103           continue;
 104         if (IsPcInstrumented(range.beg) && IsPcInstrumented(range.end - 1))
 105           continue;
 106         VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
 107                 range.beg, range.end, mod.full_name());
 108         const uptr idx =
 109             atomic_load(&instrumented_ranges_count_, memory_order_relaxed);
 110         CHECK_LT(idx, kMaxLibs);
 111         instrumented_code_ranges_[idx].begin = range.beg;
 112         instrumented_code_ranges_[idx].end = range.end;
 113         atomic_store(&instrumented_ranges_count_, idx + 1,
 114                      memory_order_release);
 115       }
 116     }
 117   }
 118 }
 119
 120 void LibIgnore::OnLibraryUnloaded() {
 121   OnLibraryLoaded(nullptr);
 122 }
 123
 124 } // namespace __sanitizer
 125
 126 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC ||
 127         // SANITIZER_NETBSD