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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238078 91177308-0d34-0410-b5e6-96231b3b80d8
168 lines
5.5 KiB
C++
168 lines
5.5 KiB
C++
//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// Define the main class fuzzer::Fuzzer and most functions.
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//===----------------------------------------------------------------------===//
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#include <cassert>
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#include <climits>
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#include <chrono>
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#include <cstddef>
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#include <cstdlib>
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#include <string>
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#include <vector>
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#include <unordered_set>
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#include "FuzzerInterface.h"
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namespace fuzzer {
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typedef std::vector<uint8_t> Unit;
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using namespace std::chrono;
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std::string FileToString(const std::string &Path);
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Unit FileToVector(const std::string &Path);
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void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
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long *Epoch);
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void WriteToFile(const Unit &U, const std::string &Path);
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void CopyFileToErr(const std::string &Path);
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// Returns "Dir/FileName" or equivalent for the current OS.
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std::string DirPlusFile(const std::string &DirPath,
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const std::string &FileName);
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size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
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size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
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size_t Size2, uint8_t *Out, size_t MaxOutSize);
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void Printf(const char *Fmt, ...);
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void Print(const Unit &U, const char *PrintAfter = "");
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void PrintASCII(const Unit &U, const char *PrintAfter = "");
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std::string Hash(const Unit &U);
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void SetTimer(int Seconds);
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void PrintFileAsBase64(const std::string &Path);
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void ExecuteCommand(const std::string &Command);
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// Private copy of SHA1 implementation.
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static const int kSHA1NumBytes = 20;
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// Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
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void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
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int NumberOfCpuCores();
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class Fuzzer {
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public:
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struct FuzzingOptions {
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int Verbosity = 1;
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int MaxLen = 0;
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int UnitTimeoutSec = 300;
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bool DoCrossOver = true;
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int MutateDepth = 5;
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bool ExitOnFirst = false;
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bool UseCounters = false;
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bool UseTraces = false;
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bool UseFullCoverageSet = false;
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bool Reload = true;
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int PreferSmallDuringInitialShuffle = -1;
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size_t MaxNumberOfRuns = ULONG_MAX;
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int SyncTimeout = 600;
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std::string OutputCorpus;
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std::string SyncCommand;
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std::vector<std::string> Tokens;
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};
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Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
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void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
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void Loop(size_t NumIterations);
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void ShuffleAndMinimize();
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void InitializeTraceState();
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size_t CorpusSize() const { return Corpus.size(); }
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void ReadDir(const std::string &Path, long *Epoch) {
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ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
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}
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void RereadOutputCorpus();
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// Save the current corpus to OutputCorpus.
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void SaveCorpus();
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size_t secondsSinceProcessStartUp() {
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return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
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.count();
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}
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size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
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static void StaticAlarmCallback();
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Unit SubstituteTokens(const Unit &U) const;
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private:
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void AlarmCallback();
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void ExecuteCallback(const Unit &U);
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void MutateAndTestOne(Unit *U);
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void ReportNewCoverage(size_t NewCoverage, const Unit &U);
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size_t RunOne(const Unit &U);
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void RunOneAndUpdateCorpus(const Unit &U);
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size_t RunOneMaximizeTotalCoverage(const Unit &U);
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size_t RunOneMaximizeFullCoverageSet(const Unit &U);
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size_t RunOneMaximizeCoveragePairs(const Unit &U);
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void WriteToOutputCorpus(const Unit &U);
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void WriteToCrash(const Unit &U, const char *Prefix);
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void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
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void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
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void SyncCorpus();
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// Trace-based fuzzing: we run a unit with some kind of tracing
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// enabled and record potentially useful mutations. Then
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// We apply these mutations one by one to the unit and run it again.
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// Start tracing; forget all previously proposed mutations.
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void StartTraceRecording();
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// Stop tracing and return the number of proposed mutations.
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size_t StopTraceRecording();
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// Apply Idx-th trace-based mutation to U.
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void ApplyTraceBasedMutation(size_t Idx, Unit *U);
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void SetDeathCallback();
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static void StaticDeathCallback();
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void DeathCallback();
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Unit CurrentUnit;
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size_t TotalNumberOfRuns = 0;
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std::vector<Unit> Corpus;
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std::unordered_set<std::string> UnitHashesAddedToCorpus;
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std::unordered_set<uintptr_t> FullCoverageSets;
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// For UseCounters
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std::vector<uint8_t> CounterBitmap;
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size_t TotalBits() { // Slow. Call it only for printing stats.
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size_t Res = 0;
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for (auto x : CounterBitmap) Res += __builtin_popcount(x);
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return Res;
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}
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UserSuppliedFuzzer &USF;
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FuzzingOptions Options;
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system_clock::time_point ProcessStartTime = system_clock::now();
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system_clock::time_point LastExternalSync = system_clock::now();
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system_clock::time_point UnitStartTime;
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long TimeOfLongestUnitInSeconds = 0;
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long EpochOfLastReadOfOutputCorpus = 0;
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};
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class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
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public:
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SimpleUserSuppliedFuzzer(UserCallback Callback) : Callback(Callback) {}
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virtual void TargetFunction(const uint8_t *Data, size_t Size) {
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return Callback(Data, Size);
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}
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private:
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UserCallback Callback;
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};
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}; // namespace fuzzer
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