mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
9380329c4e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237533 91177308-0d34-0410-b5e6-96231b3b80d8
346 lines
10 KiB
C++
346 lines
10 KiB
C++
//===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
// Fuzzer's main loop.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "FuzzerInternal.h"
|
|
#include <sanitizer/coverage_interface.h>
|
|
#include <algorithm>
|
|
#include <iostream>
|
|
|
|
namespace fuzzer {
|
|
|
|
// 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(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");
|
|
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::cerr << "ALARM: working on the last Unit for " << Seconds << " seconds"
|
|
<< std::endl;
|
|
if (Seconds >= 3) {
|
|
Print(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 (UnitsAddedAfterInitialLoad.insert(X).second) {
|
|
Corpus.push_back(X);
|
|
CurrentUnit.clear();
|
|
CurrentUnit.insert(CurrentUnit.begin(), X.begin(), X.end());
|
|
size_t NewCoverage = RunOne(CurrentUnit);
|
|
if (NewCoverage && 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 << "PreferSmall: " << PreferSmall << "\n";
|
|
PrintStats("READ ", 0);
|
|
std::vector<Unit> NewCorpus;
|
|
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++) {
|
|
U.clear();
|
|
size_t Last = std::min(First + Options.MaxLen, C.size());
|
|
U.insert(U.begin(), C.begin() + First, C.begin() + Last);
|
|
size_t NewCoverage = RunOne(U);
|
|
if (NewCoverage) {
|
|
MaxCov = NewCoverage;
|
|
NewCorpus.push_back(U);
|
|
if (Options.Verbosity >= 2)
|
|
std::cerr << "NEW0: " << NewCoverage
|
|
<< " L " << U.size()
|
|
<< "\n";
|
|
}
|
|
}
|
|
}
|
|
Corpus = NewCorpus;
|
|
PrintStats("INITED", MaxCov);
|
|
}
|
|
|
|
size_t Fuzzer::RunOne(const Unit &U) {
|
|
UnitStartTime = system_clock::now();
|
|
TotalNumberOfRuns++;
|
|
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) {
|
|
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) {
|
|
uintptr_t Res = 0;
|
|
for (uintptr_t i = 0; i < NumPCs; i++) {
|
|
Res = (Res + PCs[i]) * 7;
|
|
}
|
|
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.
|
|
// This produces tons of new units and as is it's only suitable for small tests,
|
|
// e.g. test/FullCoverageSetTest.cpp. FIXME: make it scale.
|
|
size_t Fuzzer::RunOneMaximizeFullCoverageSet(const Unit &U) {
|
|
__sanitizer_reset_coverage();
|
|
ExecuteCallback(U);
|
|
uintptr_t *PCs;
|
|
uintptr_t NumPCs =__sanitizer_get_coverage_guards(&PCs);
|
|
if (FullCoverageSets.insert(HashOfArrayOfPCs(PCs, NumPCs)).second)
|
|
return FullCoverageSets.size();
|
|
return 0;
|
|
}
|
|
|
|
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();
|
|
ExecuteCallback(U);
|
|
size_t NewCoverage = __sanitizer_get_total_unique_coverage();
|
|
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;
|
|
}
|
|
|
|
void Fuzzer::WriteToOutputCorpus(const Unit &U) {
|
|
if (Options.OutputCorpus.empty()) return;
|
|
std::string Path = DirPlusFile(Options.OutputCorpus, Hash(U));
|
|
WriteToFile(U, Path);
|
|
if (Options.Verbosity >= 2)
|
|
std::cerr << "Written to " << Path << std::endl;
|
|
}
|
|
|
|
void Fuzzer::WriteToCrash(const Unit &U, const char *Prefix) {
|
|
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() {
|
|
if (Options.OutputCorpus.empty()) return;
|
|
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";
|
|
}
|
|
|
|
void Fuzzer::ReportNewCoverage(size_t NewCoverage, const Unit &U) {
|
|
if (!NewCoverage) return;
|
|
Corpus.push_back(U);
|
|
UnitsAddedAfterInitialLoad.insert(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);
|
|
RunOneAndUpdateCorpus(*U);
|
|
size_t NumTraceBasedMutations = StopTraceRecording();
|
|
for (size_t j = 0; j < NumTraceBasedMutations; j++) {
|
|
ApplyTraceBasedMutation(j, U);
|
|
RunOneAndUpdateCorpus(*U);
|
|
}
|
|
}
|
|
}
|
|
|
|
void Fuzzer::Loop(size_t NumIterations) {
|
|
for (size_t i = 1; i <= NumIterations; i++) {
|
|
for (size_t J1 = 0; J1 < Corpus.size(); J1++) {
|
|
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);
|
|
MutateAndTestOne(&CurrentUnit);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace fuzzer
|