#include "FuzzerInternal.h"
#include <sanitizer/coverage_interface.h>
#include <algorithm>
-#include <iostream>
namespace fuzzer {
+static const size_t kMaxUnitSizeToPrint = 4096;
// Only one Fuzzer per process.
static Fuzzer *F;
-Fuzzer::Fuzzer(UserCallback Callback, FuzzingOptions Options)
- : Callback(Callback), Options(Options) {
+Fuzzer::Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options)
+ : USF(USF), Options(Options) {
SetDeathCallback();
- InitializeDFSan();
+ InitializeTraceState();
assert(!F);
F = this;
}
} else {
auto T = SubstituteTokens(U);
T.push_back(0);
- std::cerr << T.data();
- std::cerr << PrintAfter;
+ Printf("%s%s", T.data(), PrintAfter);
}
}
}
void Fuzzer::DeathCallback() {
- std::cerr << "DEATH: " << std::endl;
+ Printf("DEATH:\n");
Print(CurrentUnit, "\n");
PrintUnitInASCIIOrTokens(CurrentUnit, "\n");
- WriteToCrash(CurrentUnit, "crash-");
+ WriteUnitToFileWithPrefix(CurrentUnit, "crash-");
}
void Fuzzer::StaticAlarmCallback() {
}
void Fuzzer::AlarmCallback() {
+ assert(Options.UnitTimeoutSec > 0);
size_t Seconds =
duration_cast<seconds>(system_clock::now() - UnitStartTime).count();
- std::cerr << "ALARM: working on the last Unit for " << Seconds << " seconds"
- << std::endl;
- if (Seconds >= 3) {
- Print(CurrentUnit, "\n");
+ if (Seconds == 0) return;
+ if (Options.Verbosity >= 2)
+ Printf("AlarmCallback %zd\n", Seconds);
+ if (Seconds >= (size_t)Options.UnitTimeoutSec) {
+ Printf("ALARM: working on the last Unit for %zd seconds\n", Seconds);
+ Printf(" and the timeout value is %d (use -timeout=N to change)\n",
+ Options.UnitTimeoutSec);
+ if (CurrentUnit.size() <= kMaxUnitSizeToPrint)
+ Print(CurrentUnit, "\n");
PrintUnitInASCIIOrTokens(CurrentUnit, "\n");
- WriteToCrash(CurrentUnit, "timeout-");
+ WriteUnitToFileWithPrefix(CurrentUnit, "timeout-");
+ exit(1);
}
- 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;
+ Printf("#%zd\t%s cov: %zd bits: %zd units: %zd exec/s: %zd",
+ TotalNumberOfRuns, Where, Cov, TotalBits(), Corpus.size(), ExecPerSec);
+ if (TotalNumberOfExecutedTraceBasedMutations)
+ Printf(" tbm: %zd", TotalNumberOfExecutedTraceBasedMutations);
+ Printf("%s", 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;
+ if (Options.Verbosity >= 2)
+ Printf("Reload: read %zd new units.\n", AdditionalCorpus.size());
+ 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));
+ bool PreferSmall = (Options.PreferSmallDuringInitialShuffle == 1 ||
+ (Options.PreferSmallDuringInitialShuffle == -1 &&
+ USF.GetRand().RandBool()));
if (Options.Verbosity)
- std::cerr << "PreferSmall: " << PreferSmall << "\n";
+ Printf("PreferSmall: %d\n", PreferSmall);
PrintStats("READ ", 0);
std::vector<Unit> NewCorpus;
- std::random_shuffle(Corpus.begin(), Corpus.end());
+ std::random_shuffle(Corpus.begin(), Corpus.end(), USF.GetRand());
if (PreferSmall)
std::stable_sort(
Corpus.begin(), Corpus.end(),
MaxCov = NewCoverage;
NewCorpus.push_back(U);
if (Options.Verbosity >= 2)
- std::cerr << "NEW0: " << NewCoverage
- << " L " << U.size()
- << "\n";
+ Printf("NEW0: %zd L %zd\n", NewCoverage, U.size());
}
}
}
Corpus = NewCorpus;
+ for (auto &X : Corpus)
+ UnitHashesAddedToCorpus.insert(Hash(X));
PrintStats("INITED", MaxCov);
}
size_t Res = 0;
if (Options.UseFullCoverageSet)
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) {
+ if (TimeOfUnit > TimeOfLongestUnitInSeconds &&
+ TimeOfUnit >= Options.ReportSlowUnits) {
TimeOfLongestUnitInSeconds = TimeOfUnit;
- std::cerr << "Longest unit: " << TimeOfLongestUnitInSeconds
- << " s:\n";
- Print(U, "\n");
+ Printf("Slowest unit: %zd s:\n", TimeOfLongestUnitInSeconds);
+ if (U.size() <= kMaxUnitSizeToPrint)
+ Print(U, "\n");
+ WriteUnitToFileWithPrefix(U, "slow-unit-");
}
return Res;
}
+void Fuzzer::RunOneAndUpdateCorpus(Unit &U) {
+ if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
+ return;
+ if (Options.OnlyASCII)
+ ToASCII(U);
+ ReportNewCoverage(RunOne(U), U);
+}
+
static uintptr_t HashOfArrayOfPCs(uintptr_t *PCs, uintptr_t NumPCs) {
uintptr_t Res = 0;
for (uintptr_t i = 0; i < NumPCs; i++) {
void Fuzzer::ExecuteCallback(const Unit &U) {
if (Options.Tokens.empty()) {
- Callback(U.data(), U.size());
+ USF.TargetFunction(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;
- }
+ USF.TargetFunction(T.data(), T.size());
}
- if (HasNewPairs)
- return CoveragePairs.size();
- return 0;
}
// Experimental.
std::string Path = DirPlusFile(Options.OutputCorpus, Hash(U));
WriteToFile(U, Path);
if (Options.Verbosity >= 2)
- std::cerr << "Written to " << Path << std::endl;
+ Printf("Written to %s\n", Path.c_str());
+#ifdef DEBUG
+ if (Options.OnlyASCII)
+ for (auto X : U)
+ assert(isprint(X) || isspace(X));
+#endif
}
-void Fuzzer::WriteToCrash(const Unit &U, const char *Prefix) {
+void Fuzzer::WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix) {
std::string Path = Prefix + Hash(U);
WriteToFile(U, Path);
- std::cerr << "CRASHED; file written to " << Path << std::endl;
+ Printf("Test unit written to %s\n", Path.c_str());
+ if (U.size() <= kMaxUnitSizeToPrint) {
+ Printf("Base64: ");
+ PrintFileAsBase64(Path);
+ }
}
void Fuzzer::SaveCorpus() {
for (const auto &U : Corpus)
WriteToFile(U, DirPlusFile(Options.OutputCorpus, Hash(U)));
if (Options.Verbosity)
- std::cerr << "Written corpus of " << Corpus.size() << " files to "
- << Options.OutputCorpus << "\n";
+ Printf("Written corpus of %zd files to %s\n", Corpus.size(),
+ Options.OutputCorpus.c_str());
}
-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) {
+ Printf(" L: %zd", U.size());
+ if (U.size() < 30) {
+ Printf(" ");
+ PrintUnitInASCIIOrTokens(U, "\t");
+ Print(U);
+ }
+ Printf("\n");
+ }
+ WriteToOutputCorpus(U);
+ if (Options.ExitOnFirst)
+ exit(0);
+}
+
+void Fuzzer::MutateAndTestOne(Unit *U) {
for (int i = 0; i < Options.MutateDepth; i++) {
- if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
- return NewUnits;
- MutateWithDFSan(U);
- Mutate(U, Options.MaxLen);
- size_t NewCoverage = RunOne(*U);
- if (NewCoverage) {
- Corpus.push_back(*U);
- NewUnits++;
- 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";
+ StartTraceRecording();
+ size_t Size = U->size();
+ U->resize(Options.MaxLen);
+ size_t NewSize = USF.Mutate(U->data(), Size, U->size());
+ assert(NewSize > 0 && "Mutator returned empty unit");
+ assert(NewSize <= (size_t)Options.MaxLen &&
+ "Mutator return overisized unit");
+ U->resize(NewSize);
+ RunOneAndUpdateCorpus(*U);
+ size_t NumTraceBasedMutations = StopTraceRecording();
+ size_t TBMWidth =
+ std::min((size_t)Options.TBMWidth, NumTraceBasedMutations);
+ size_t TBMDepth =
+ std::min((size_t)Options.TBMDepth, NumTraceBasedMutations);
+ Unit BackUp = *U;
+ for (size_t w = 0; w < TBMWidth; w++) {
+ *U = BackUp;
+ for (size_t d = 0; d < TBMDepth; d++) {
+ TotalNumberOfExecutedTraceBasedMutations++;
+ ApplyTraceBasedMutation(USF.GetRand()(NumTraceBasedMutations), U);
+ RunOneAndUpdateCorpus(*U);
}
- WriteToOutputCorpus(*U);
- if (Options.ExitOnFirst)
- exit(0);
}
}
- 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++) {
for (size_t J1 = 0; J1 < Corpus.size(); J1++) {
+ SyncCorpus();
+ RereadOutputCorpus();
if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
- return NewUnits;
+ return;
// First, simply mutate the unit w/o doing crosses.
CurrentUnit = Corpus[J1];
- NewUnits += MutateAndTestOne(&CurrentUnit);
+ MutateAndTestOne(&CurrentUnit);
// Now, cross with others.
- if (Options.DoCrossOver) {
+ if (Options.DoCrossOver && !Corpus[J1].empty()) {
for (size_t J2 = 0; J2 < Corpus.size(); J2++) {
- CurrentUnit.clear();
- CrossOver(Corpus[J1], Corpus[J2], &CurrentUnit, Options.MaxLen);
- NewUnits += MutateAndTestOne(&CurrentUnit);
+ CurrentUnit.resize(Options.MaxLen);
+ size_t NewSize = USF.CrossOver(
+ Corpus[J1].data(), Corpus[J1].size(), Corpus[J2].data(),
+ Corpus[J2].size(), CurrentUnit.data(), CurrentUnit.size());
+ assert(NewSize > 0 && "CrossOver returned empty unit");
+ assert(NewSize <= (size_t)Options.MaxLen &&
+ "CrossOver return overisized unit");
+ CurrentUnit.resize(NewSize);
+ 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