libsanitizer/tsan/tsan_suppressions.cc

   1 //===-- tsan_suppressions.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 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "sanitizer_common/sanitizer_common.h"
  13 #include "sanitizer_common/sanitizer_libc.h"
  14 #include "sanitizer_common/sanitizer_placement_new.h"
  15 #include "sanitizer_common/sanitizer_suppressions.h"
  16 #include "tsan_suppressions.h"
  17 #include "tsan_rtl.h"
  18 #include "tsan_flags.h"
  19 #include "tsan_mman.h"
  20 #include "tsan_platform.h"
  21
  22 #if !SANITIZER_GO
  23 // Suppressions for true/false positives in standard libraries.
  24 static const char *const std_suppressions =
  25 // Libstdc++ 4.4 has data races in std::string.
  26 // See http://crbug.com/181502 for an example.
  27 "race:^_M_rep$\n"
  28 "race:^_M_is_leaked$\n"
  29 // False positive when using std <thread>.
  30 // Happens because we miss atomic synchronization in libstdc++.
  31 // See http://llvm.org/bugs/show_bug.cgi?id=17066 for details.
  32 "race:std::_Sp_counted_ptr_inplace<std::thread::_Impl\n";
  33
  34 // Can be overriden in frontend.
  35 SANITIZER_WEAK_DEFAULT_IMPL
  36 const char *__tsan_default_suppressions() {
  37   return 0;
  38 }
  39 #endif
  40
  41 namespace __tsan {
  42
  43 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
  44 static SuppressionContext *suppression_ctx = nullptr;
  45 static const char *kSuppressionTypes[] = {
  46     kSuppressionRace,   kSuppressionRaceTop, kSuppressionMutex,
  47     kSuppressionThread, kSuppressionSignal, kSuppressionLib,
  48     kSuppressionDeadlock};
  49
  50 void InitializeSuppressions() {
  51   CHECK_EQ(nullptr, suppression_ctx);
  52   suppression_ctx = new (suppression_placeholder) // NOLINT
  53       SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
  54   suppression_ctx->ParseFromFile(flags()->suppressions);
  55 #if !SANITIZER_GO
  56   suppression_ctx->Parse(__tsan_default_suppressions());
  57   suppression_ctx->Parse(std_suppressions);
  58 #endif
  59 }
  60
  61 SuppressionContext *Suppressions() {
  62   CHECK(suppression_ctx);
  63   return suppression_ctx;
  64 }
  65
  66 static const char *conv(ReportType typ) {
  67   if (typ == ReportTypeRace)
  68     return kSuppressionRace;
  69   else if (typ == ReportTypeVptrRace)
  70     return kSuppressionRace;
  71   else if (typ == ReportTypeUseAfterFree)
  72     return kSuppressionRace;
  73   else if (typ == ReportTypeVptrUseAfterFree)
  74     return kSuppressionRace;
  75   else if (typ == ReportTypeExternalRace)
  76     return kSuppressionRace;
  77   else if (typ == ReportTypeThreadLeak)
  78     return kSuppressionThread;
  79   else if (typ == ReportTypeMutexDestroyLocked)
  80     return kSuppressionMutex;
  81   else if (typ == ReportTypeMutexDoubleLock)
  82     return kSuppressionMutex;
  83   else if (typ == ReportTypeMutexInvalidAccess)
  84     return kSuppressionMutex;
  85   else if (typ == ReportTypeMutexBadUnlock)
  86     return kSuppressionMutex;
  87   else if (typ == ReportTypeMutexBadReadLock)
  88     return kSuppressionMutex;
  89   else if (typ == ReportTypeMutexBadReadUnlock)
  90     return kSuppressionMutex;
  91   else if (typ == ReportTypeSignalUnsafe)
  92     return kSuppressionSignal;
  93   else if (typ == ReportTypeErrnoInSignal)
  94     return kSuppressionNone;
  95   else if (typ == ReportTypeDeadlock)
  96     return kSuppressionDeadlock;
  97   Printf("ThreadSanitizer: unknown report type %d\n", typ);
  98   Die();
  99 }
 100
 101 static uptr IsSuppressed(const char *stype, const AddressInfo &info,
 102     Suppression **sp) {
 103   if (suppression_ctx->Match(info.function, stype, sp) ||
 104       suppression_ctx->Match(info.file, stype, sp) ||
 105       suppression_ctx->Match(info.module, stype, sp)) {
 106     VPrintf(2, "ThreadSanitizer: matched suppression '%s'\n", (*sp)->templ);
 107     atomic_fetch_add(&(*sp)->hit_count, 1, memory_order_relaxed);
 108     return info.address;
 109   }
 110   return 0;
 111 }
 112
 113 uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
 114   CHECK(suppression_ctx);
 115   if (!suppression_ctx->SuppressionCount() || stack == 0 ||
 116       !stack->suppressable)
 117     return 0;
 118   const char *stype = conv(typ);
 119   if (0 == internal_strcmp(stype, kSuppressionNone))
 120     return 0;
 121   for (const SymbolizedStack *frame = stack->frames; frame;
 122       frame = frame->next) {
 123     uptr pc = IsSuppressed(stype, frame->info, sp);
 124     if (pc != 0)
 125       return pc;
 126   }
 127   if (0 == internal_strcmp(stype, kSuppressionRace) && stack->frames != nullptr)
 128     return IsSuppressed(kSuppressionRaceTop, stack->frames->info, sp);
 129   return 0;
 130 }
 131
 132 uptr IsSuppressed(ReportType typ, const ReportLocation *loc, Suppression **sp) {
 133   CHECK(suppression_ctx);
 134   if (!suppression_ctx->SuppressionCount() || loc == 0 ||
 135       loc->type != ReportLocationGlobal || !loc->suppressable)
 136     return 0;
 137   const char *stype = conv(typ);
 138   if (0 == internal_strcmp(stype, kSuppressionNone))
 139     return 0;
 140   Suppression *s;
 141   const DataInfo &global = loc->global;
 142   if (suppression_ctx->Match(global.name, stype, &s) ||
 143       suppression_ctx->Match(global.module, stype, &s)) {
 144       VPrintf(2, "ThreadSanitizer: matched suppression '%s'\n", s->templ);
 145       atomic_fetch_add(&s->hit_count, 1, memory_order_relaxed);
 146       *sp = s;
 147       return global.start;
 148   }
 149   return 0;
 150 }
 151
 152 void PrintMatchedSuppressions() {
 153   InternalMmapVector<Suppression *> matched(1);
 154   CHECK(suppression_ctx);
 155   suppression_ctx->GetMatched(&matched);
 156   if (!matched.size())
 157     return;
 158   int hit_count = 0;
 159   for (uptr i = 0; i < matched.size(); i++)
 160     hit_count += atomic_load_relaxed(&matched[i]->hit_count);
 161   Printf("ThreadSanitizer: Matched %d suppressions (pid=%d):\n", hit_count,
 162          (int)internal_getpid());
 163   for (uptr i = 0; i < matched.size(); i++) {
 164     Printf("%d %s:%s\n", atomic_load_relaxed(&matched[i]->hit_count),
 165            matched[i]->type, matched[i]->templ);
 166   }
 167 }
 168 }  // namespace __tsan