#include <algorithm>
#include <iostream>
-// This function should be defined by the user.
-extern "C" void TestOneInput(const uint8_t *Data, size_t Size);
-
namespace fuzzer {
-// static
-Unit Fuzzer::CurrentUnit;
-system_clock::time_point Fuzzer::UnitStartTime;
+// Only one Fuzzer per process.
+static Fuzzer *F;
+
+Fuzzer::Fuzzer(UserCallback Callback, FuzzingOptions Options)
+ : Callback(Callback), Options(Options) {
+ SetDeathCallback();
+ InitializeTraceState();
+ assert(!F);
+ F = this;
+}
void Fuzzer::SetDeathCallback() {
- __sanitizer_set_death_callback(DeathCallback);
+ __sanitizer_set_death_callback(StaticDeathCallback);
+}
+
+void Fuzzer::PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter) {
+ if (Options.Tokens.empty()) {
+ PrintASCII(U, PrintAfter);
+ } else {
+ auto T = SubstituteTokens(U);
+ T.push_back(0);
+ std::cerr << T.data();
+ std::cerr << PrintAfter;
+ }
+}
+
+void Fuzzer::StaticDeathCallback() {
+ assert(F);
+ F->DeathCallback();
}
void Fuzzer::DeathCallback() {
std::cerr << "DEATH: " << std::endl;
Print(CurrentUnit, "\n");
- PrintASCII(CurrentUnit, "\n");
+ PrintUnitInASCIIOrTokens(CurrentUnit, "\n");
WriteToCrash(CurrentUnit, "crash-");
}
+void Fuzzer::StaticAlarmCallback() {
+ assert(F);
+ F->AlarmCallback();
+}
+
void Fuzzer::AlarmCallback() {
size_t Seconds =
duration_cast<seconds>(system_clock::now() - UnitStartTime).count();
<< std::endl;
if (Seconds >= 3) {
Print(CurrentUnit, "\n");
- PrintASCII(CurrentUnit, "\n");
+ PrintUnitInASCIIOrTokens(CurrentUnit, "\n");
WriteToCrash(CurrentUnit, "timeout-");
}
exit(1);
}
+void Fuzzer::PrintStats(const char *Where, size_t Cov, const char *End) {
+ if (!Options.Verbosity) return;
+ size_t Seconds = secondsSinceProcessStartUp();
+ size_t ExecPerSec = (Seconds ? TotalNumberOfRuns / Seconds : 0);
+ std::cerr
+ << "#" << TotalNumberOfRuns
+ << "\t" << Where
+ << " cov " << Cov
+ << " bits " << TotalBits()
+ << " units " << Corpus.size()
+ << " exec/s " << ExecPerSec
+ << End;
+}
+
+void Fuzzer::RereadOutputCorpus() {
+ if (Options.OutputCorpus.empty()) return;
+ std::vector<Unit> AdditionalCorpus;
+ ReadDirToVectorOfUnits(Options.OutputCorpus.c_str(), &AdditionalCorpus,
+ &EpochOfLastReadOfOutputCorpus);
+ if (Corpus.empty()) {
+ Corpus = AdditionalCorpus;
+ return;
+ }
+ if (!Options.Reload) return;
+ for (auto &X : AdditionalCorpus) {
+ if (X.size() > (size_t)Options.MaxLen)
+ X.resize(Options.MaxLen);
+ if (UnitHashesAddedToCorpus.insert(Hash(X)).second) {
+ CurrentUnit.clear();
+ CurrentUnit.insert(CurrentUnit.begin(), X.begin(), X.end());
+ size_t NewCoverage = RunOne(CurrentUnit);
+ if (NewCoverage) {
+ Corpus.push_back(X);
+ if (Options.Verbosity >= 1)
+ PrintStats("RELOAD", NewCoverage);
+ }
+ }
+ }
+}
+
void Fuzzer::ShuffleAndMinimize() {
+ size_t MaxCov = 0;
+ bool PreferSmall =
+ (Options.PreferSmallDuringInitialShuffle == 1 ||
+ (Options.PreferSmallDuringInitialShuffle == -1 && rand() % 2));
if (Options.Verbosity)
- std::cerr << "Shuffle: " << Corpus.size() << "\n";
+ std::cerr << "PreferSmall: " << PreferSmall << "\n";
+ PrintStats("READ ", 0);
std::vector<Unit> NewCorpus;
- random_shuffle(Corpus.begin(), Corpus.end());
- size_t MaxCov = 0;
+ std::random_shuffle(Corpus.begin(), Corpus.end());
+ if (PreferSmall)
+ std::stable_sort(
+ Corpus.begin(), Corpus.end(),
+ [](const Unit &A, const Unit &B) { return A.size() < B.size(); });
Unit &U = CurrentUnit;
for (const auto &C : Corpus) {
for (size_t First = 0; First < 1; First++) {
MaxCov = NewCoverage;
NewCorpus.push_back(U);
if (Options.Verbosity >= 2)
- std::cerr << "NEW0: " << NewCoverage << "\n";
+ std::cerr << "NEW0: " << NewCoverage
+ << " L " << U.size()
+ << "\n";
}
}
}
Corpus = NewCorpus;
- if (Options.Verbosity)
- std::cerr << "Shuffle done: " << Corpus.size() << " IC: " << MaxCov << "\n";
+ for (auto &X : Corpus)
+ UnitHashesAddedToCorpus.insert(Hash(X));
+ PrintStats("INITED", MaxCov);
}
size_t Fuzzer::RunOne(const Unit &U) {
UnitStartTime = system_clock::now();
TotalNumberOfRuns++;
+ size_t Res = 0;
if (Options.UseFullCoverageSet)
- return RunOneMaximizeFullCoverageSet(U);
- return RunOneMaximizeTotalCoverage(U);
+ Res = RunOneMaximizeFullCoverageSet(U);
+ else if (Options.UseCoveragePairs)
+ Res = RunOneMaximizeCoveragePairs(U);
+ else
+ Res = RunOneMaximizeTotalCoverage(U);
+ auto UnitStopTime = system_clock::now();
+ auto TimeOfUnit =
+ duration_cast<seconds>(UnitStopTime - UnitStartTime).count();
+ if (TimeOfUnit > TimeOfLongestUnitInSeconds) {
+ TimeOfLongestUnitInSeconds = TimeOfUnit;
+ std::cerr << "Longest unit: " << TimeOfLongestUnitInSeconds
+ << " s:\n";
+ Print(U, "\n");
+ }
+ return Res;
+}
+
+void Fuzzer::RunOneAndUpdateCorpus(const Unit &U) {
+ if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
+ return;
+ ReportNewCoverage(RunOne(U), U);
}
static uintptr_t HashOfArrayOfPCs(uintptr_t *PCs, uintptr_t NumPCs) {
return Res;
}
+Unit Fuzzer::SubstituteTokens(const Unit &U) const {
+ Unit Res;
+ for (auto Idx : U) {
+ if (Idx < Options.Tokens.size()) {
+ std::string Token = Options.Tokens[Idx];
+ Res.insert(Res.end(), Token.begin(), Token.end());
+ } else {
+ Res.push_back(' ');
+ }
+ }
+ // FIXME: Apply DFSan labels.
+ return Res;
+}
+
+void Fuzzer::ExecuteCallback(const Unit &U) {
+ if (Options.Tokens.empty()) {
+ Callback(U.data(), U.size());
+ } else {
+ auto T = SubstituteTokens(U);
+ Callback(T.data(), T.size());
+ }
+}
+
+// Experimental. Does not yet scale.
+// Fuly reset the current coverage state, run a single unit,
+// collect all coverage pairs and return non-zero if a new pair is observed.
+size_t Fuzzer::RunOneMaximizeCoveragePairs(const Unit &U) {
+ __sanitizer_reset_coverage();
+ ExecuteCallback(U);
+ uintptr_t *PCs;
+ uintptr_t NumPCs = __sanitizer_get_coverage_guards(&PCs);
+ bool HasNewPairs = false;
+ for (uintptr_t i = 0; i < NumPCs; i++) {
+ if (!PCs[i]) continue;
+ for (uintptr_t j = 0; j < NumPCs; j++) {
+ if (!PCs[j]) continue;
+ uint64_t Pair = (i << 32) | j;
+ HasNewPairs |= CoveragePairs.insert(Pair).second;
+ }
+ }
+ if (HasNewPairs)
+ return CoveragePairs.size();
+ return 0;
+}
+
+// Experimental.
// Fuly reset the current coverage state, run a single unit,
// compute a hash function from the full coverage set,
// return non-zero if the hash value is new.
// e.g. test/FullCoverageSetTest.cpp. FIXME: make it scale.
size_t Fuzzer::RunOneMaximizeFullCoverageSet(const Unit &U) {
__sanitizer_reset_coverage();
- TestOneInput(U.data(), U.size());
+ ExecuteCallback(U);
uintptr_t *PCs;
uintptr_t NumPCs =__sanitizer_get_coverage_guards(&PCs);
if (FullCoverageSets.insert(HashOfArrayOfPCs(PCs, NumPCs)).second)
}
size_t Fuzzer::RunOneMaximizeTotalCoverage(const Unit &U) {
+ size_t NumCounters = __sanitizer_get_number_of_counters();
+ if (Options.UseCounters) {
+ CounterBitmap.resize(NumCounters);
+ __sanitizer_update_counter_bitset_and_clear_counters(0);
+ }
size_t OldCoverage = __sanitizer_get_total_unique_coverage();
- TestOneInput(U.data(), U.size());
+ ExecuteCallback(U);
size_t NewCoverage = __sanitizer_get_total_unique_coverage();
- if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) && Options.Verbosity) {
- size_t Seconds =
- duration_cast<seconds>(system_clock::now() - ProcessStartTime).count();
- std::cerr
- << "#" << TotalNumberOfRuns
- << "\tcov: " << NewCoverage
- << "\texec/s: " << (Seconds ? TotalNumberOfRuns / Seconds : 0) << "\n";
- }
- if (NewCoverage > OldCoverage)
+ size_t NumNewBits = 0;
+ if (Options.UseCounters)
+ NumNewBits = __sanitizer_update_counter_bitset_and_clear_counters(
+ CounterBitmap.data());
+
+ if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) && Options.Verbosity)
+ PrintStats("pulse ", NewCoverage);
+
+ if (NewCoverage > OldCoverage || NumNewBits)
return NewCoverage;
return 0;
}
std::string Path = Prefix + Hash(U);
WriteToFile(U, Path);
std::cerr << "CRASHED; file written to " << Path << std::endl;
+ std::cerr << "Base64: ";
+ PrintFileAsBase64(Path);
}
void Fuzzer::SaveCorpus() {
<< Options.OutputCorpus << "\n";
}
-size_t Fuzzer::MutateAndTestOne(Unit *U) {
- size_t NewUnits = 0;
+void Fuzzer::ReportNewCoverage(size_t NewCoverage, const Unit &U) {
+ if (!NewCoverage) return;
+ Corpus.push_back(U);
+ UnitHashesAddedToCorpus.insert(Hash(U));
+ PrintStats("NEW ", NewCoverage, "");
+ if (Options.Verbosity) {
+ std::cerr << " L: " << U.size();
+ if (U.size() < 30) {
+ std::cerr << " ";
+ PrintUnitInASCIIOrTokens(U, "\t");
+ Print(U);
+ }
+ std::cerr << "\n";
+ }
+ WriteToOutputCorpus(U);
+ if (Options.ExitOnFirst)
+ exit(0);
+}
+
+void Fuzzer::MutateAndTestOne(Unit *U) {
for (int i = 0; i < Options.MutateDepth; i++) {
+ StartTraceRecording();
Mutate(U, Options.MaxLen);
- size_t NewCoverage = RunOne(*U);
- if (NewCoverage) {
- Corpus.push_back(*U);
- NewUnits++;
- if (Options.Verbosity) {
- std::cerr << "#" << TotalNumberOfRuns
- << "\tNEW: " << NewCoverage
- << " L: " << U->size()
- << " S: " << Corpus.size()
- << " I: " << i
- << "\t";
- if (U->size() < 30) {
- PrintASCII(*U);
- std::cerr << "\t";
- Print(*U);
- }
- std::cerr << "\n";
- }
- WriteToOutputCorpus(*U);
- if (Options.ExitOnFirst)
- exit(0);
+ RunOneAndUpdateCorpus(*U);
+ size_t NumTraceBasedMutations = StopTraceRecording();
+ for (size_t j = 0; j < NumTraceBasedMutations; j++) {
+ ApplyTraceBasedMutation(j, U);
+ RunOneAndUpdateCorpus(*U);
}
}
- return NewUnits;
}
-size_t Fuzzer::Loop(size_t NumIterations) {
- size_t NewUnits = 0;
+void Fuzzer::Loop(size_t NumIterations) {
for (size_t i = 1; i <= NumIterations; i++) {
- if (Options.DoCrossOver) {
- for (size_t J1 = 0; J1 < Corpus.size(); J1++) {
+ for (size_t J1 = 0; J1 < Corpus.size(); J1++) {
+ SyncCorpus();
+ RereadOutputCorpus();
+ if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
+ return;
+ // First, simply mutate the unit w/o doing crosses.
+ CurrentUnit = Corpus[J1];
+ MutateAndTestOne(&CurrentUnit);
+ // Now, cross with others.
+ if (Options.DoCrossOver) {
for (size_t J2 = 0; J2 < Corpus.size(); J2++) {
CurrentUnit.clear();
CrossOver(Corpus[J1], Corpus[J2], &CurrentUnit, Options.MaxLen);
- NewUnits += MutateAndTestOne(&CurrentUnit);
+ MutateAndTestOne(&CurrentUnit);
}
}
- } else { // No CrossOver
- for (size_t J = 0; J < Corpus.size(); J++) {
- CurrentUnit = Corpus[J];
- NewUnits += MutateAndTestOne(&CurrentUnit);
- }
}
}
- return NewUnits;
+}
+
+void Fuzzer::SyncCorpus() {
+ if (Options.SyncCommand.empty() || Options.OutputCorpus.empty()) return;
+ auto Now = system_clock::now();
+ if (duration_cast<seconds>(Now - LastExternalSync).count() <
+ Options.SyncTimeout)
+ return;
+ LastExternalSync = Now;
+ ExecuteCommand(Options.SyncCommand + " " + Options.OutputCorpus);
}
} // namespace fuzzer
projects / oota-llvm.git / blobdiff