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     SANITIZER_NETBSD || SANITIZER_OPENBSD
  12
  13 #include "sanitizer_libignore.h"
  14 #include "sanitizer_flags.h"
  15 #include "sanitizer_posix.h"
  16 #include "sanitizer_procmaps.h"
  17
  18 namespace __sanitizer {
  19
  20 LibIgnore::LibIgnore(LinkerInitialized) {
  21 }
  22
  23 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
  24   BlockingMutexLock lock(&mutex_);
  25   if (count_ >= kMaxLibs) {
  26     Report("%s: too many ignored libraries (max: %d)\n", SanitizerToolName,
  27            kMaxLibs);
  28     Die();
  29   }
  30   Lib *lib = &libs_[count_++];
  31   lib->templ = internal_strdup(name_templ);
  32   lib->name = nullptr;
  33   lib->real_name = nullptr;
  34   lib->loaded = false;
  35 }
  36
  37 void LibIgnore::OnLibraryLoaded(const char *name) {
  38   BlockingMutexLock lock(&mutex_);
  39   // Try to match suppressions with symlink target.
  40   InternalScopedString buf(kMaxPathLength);
  41   if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
  42       buf[0]) {
  43     for (uptr i = 0; i < count_; i++) {
  44       Lib *lib = &libs_[i];
  45       if (!lib->loaded && (!lib->real_name) &&
  46           TemplateMatch(lib->templ, name))
  47         lib->real_name = internal_strdup(buf.data());
  48     }
  49   }
  50
  51   // Scan suppressions list and find newly loaded and unloaded libraries.
  52   ListOfModules modules;
  53   modules.init();
  54   for (uptr i = 0; i < count_; i++) {
  55     Lib *lib = &libs_[i];
  56     bool loaded = false;
  57     for (const auto &mod : modules) {
  58       for (const auto &range : mod.ranges()) {
  59         if (!range.executable)
  60           continue;
  61         if (!TemplateMatch(lib->templ, mod.full_name()) &&
  62             !(lib->real_name &&
  63             internal_strcmp(lib->real_name, mod.full_name()) == 0))
  64           continue;
  65         if (loaded) {
  66           Report("%s: called_from_lib suppression '%s' is matched against"
  67                  " 2 libraries: '%s' and '%s'\n",
  68                  SanitizerToolName, lib->templ, lib->name, mod.full_name());
  69           Die();
  70         }
  71         loaded = true;
  72         if (lib->loaded)
  73           continue;
  74         VReport(1,
  75                 "Matched called_from_lib suppression '%s' against library"
  76                 " '%s'\n",
  77                 lib->templ, mod.full_name());
  78         lib->loaded = true;
  79         lib->name = internal_strdup(mod.full_name());
  80         const uptr idx =
  81             atomic_load(&ignored_ranges_count_, memory_order_relaxed);
  82         CHECK_LT(idx, ARRAY_SIZE(ignored_code_ranges_));
  83         ignored_code_ranges_[idx].begin = range.beg;
  84         ignored_code_ranges_[idx].end = range.end;
  85         atomic_store(&ignored_ranges_count_, idx + 1, memory_order_release);
  86         break;
  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   // Track instrumented ranges.
  98   if (track_instrumented_libs_) {
  99     for (const auto &mod : modules) {
 100       if (!mod.instrumented())
 101         continue;
 102       for (const auto &range : mod.ranges()) {
 103         if (!range.executable)
 104           continue;
 105         if (IsPcInstrumented(range.beg) && IsPcInstrumented(range.end - 1))
 106           continue;
 107         VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
 108                 range.beg, range.end, mod.full_name());
 109         const uptr idx =
 110             atomic_load(&instrumented_ranges_count_, memory_order_relaxed);
 111         CHECK_LT(idx, ARRAY_SIZE(instrumented_code_ranges_));
 112         instrumented_code_ranges_[idx].begin = range.beg;
 113         instrumented_code_ranges_[idx].end = range.end;
 114         atomic_store(&instrumented_ranges_count_, idx + 1,
 115                      memory_order_release);
 116       }
 117     }
 118   }
 119 }
 120
 121 void LibIgnore::OnLibraryUnloaded() {
 122   OnLibraryLoaded(nullptr);
 123 }
 124
 125 } // namespace __sanitizer
 126
 127 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC ||
 128         // SANITIZER_NETBSD