libsanitizer/sanitizer_common/sanitizer_libignore.cpp

   1 //===-- sanitizer_libignore.cpp -------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "sanitizer_platform.h"
  10
  11 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC || \
  12     SANITIZER_NETBSD || SANITIZER_OPENBSD
  13
  14 #include "sanitizer_libignore.h"
  15 #include "sanitizer_flags.h"
  16 #include "sanitizer_posix.h"
  17 #include "sanitizer_procmaps.h"
  18
  19 namespace __sanitizer {
  20
  21 LibIgnore::LibIgnore(LinkerInitialized) {
  22 }
  23
  24 void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
  25   BlockingMutexLock lock(&mutex_);
  26   if (count_ >= kMaxLibs) {
  27     Report("%s: too many ignored libraries (max: %d)\n", SanitizerToolName,
  28            kMaxLibs);
  29     Die();
  30   }
  31   Lib *lib = &libs_[count_++];
  32   lib->templ = internal_strdup(name_templ);
  33   lib->name = nullptr;
  34   lib->real_name = nullptr;
  35   lib->loaded = false;
  36 }
  37
  38 void LibIgnore::OnLibraryLoaded(const char *name) {
  39   BlockingMutexLock lock(&mutex_);
  40   // Try to match suppressions with symlink target.
  41   InternalScopedString buf(kMaxPathLength);
  42   if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
  43       buf[0]) {
  44     for (uptr i = 0; i < count_; i++) {
  45       Lib *lib = &libs_[i];
  46       if (!lib->loaded && (!lib->real_name) &&
  47           TemplateMatch(lib->templ, name))
  48         lib->real_name = internal_strdup(buf.data());
  49     }
  50   }
  51
  52   // Scan suppressions list and find newly loaded and unloaded libraries.
  53   ListOfModules modules;
  54   modules.init();
  55   for (uptr i = 0; i < count_; i++) {
  56     Lib *lib = &libs_[i];
  57     bool loaded = false;
  58     for (const auto &mod : modules) {
  59       for (const auto &range : mod.ranges()) {
  60         if (!range.executable)
  61           continue;
  62         if (!TemplateMatch(lib->templ, mod.full_name()) &&
  63             !(lib->real_name &&
  64             internal_strcmp(lib->real_name, mod.full_name()) == 0))
  65           continue;
  66         if (loaded) {
  67           Report("%s: called_from_lib suppression '%s' is matched against"
  68                  " 2 libraries: '%s' and '%s'\n",
  69                  SanitizerToolName, lib->templ, lib->name, mod.full_name());
  70           Die();
  71         }
  72         loaded = true;
  73         if (lib->loaded)
  74           continue;
  75         VReport(1,
  76                 "Matched called_from_lib suppression '%s' against library"
  77                 " '%s'\n",
  78                 lib->templ, mod.full_name());
  79         lib->loaded = true;
  80         lib->name = internal_strdup(mod.full_name());
  81         const uptr idx =
  82             atomic_load(&ignored_ranges_count_, memory_order_relaxed);
  83         CHECK_LT(idx, ARRAY_SIZE(ignored_code_ranges_));
  84         ignored_code_ranges_[idx].begin = range.beg;
  85         ignored_code_ranges_[idx].end = range.end;
  86         atomic_store(&ignored_ranges_count_, idx + 1, memory_order_release);
  87         break;
  88       }
  89     }
  90     if (lib->loaded && !loaded) {
  91       Report("%s: library '%s' that was matched against called_from_lib"
  92              " suppression '%s' is unloaded\n",
  93              SanitizerToolName, lib->name, lib->templ);
  94       Die();
  95     }
  96   }
  97
  98   // Track instrumented ranges.
  99   if (track_instrumented_libs_) {
 100     for (const auto &mod : modules) {
 101       if (!mod.instrumented())
 102         continue;
 103       for (const auto &range : mod.ranges()) {
 104         if (!range.executable)
 105           continue;
 106         if (IsPcInstrumented(range.beg) && IsPcInstrumented(range.end - 1))
 107           continue;
 108         VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
 109                 range.beg, range.end, mod.full_name());
 110         const uptr idx =
 111             atomic_load(&instrumented_ranges_count_, memory_order_relaxed);
 112         CHECK_LT(idx, ARRAY_SIZE(instrumented_code_ranges_));
 113         instrumented_code_ranges_[idx].begin = range.beg;
 114         instrumented_code_ranges_[idx].end = range.end;
 115         atomic_store(&instrumented_ranges_count_, idx + 1,
 116                      memory_order_release);
 117       }
 118     }
 119   }
 120 }
 121
 122 void LibIgnore::OnLibraryUnloaded() {
 123   OnLibraryLoaded(nullptr);
 124 }
 125
 126 } // namespace __sanitizer
 127
 128 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC ||
 129         // SANITIZER_NETBSD