1 //===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // Define the main class fuzzer::Fuzzer and most functions.
10 //===----------------------------------------------------------------------===//
18 #include <unordered_set>
20 #include "FuzzerInterface.h"
23 typedef std::vector<uint8_t> Unit;
24 using namespace std::chrono;
26 std::string FileToString(const std::string &Path);
27 Unit FileToVector(const std::string &Path);
28 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
30 void WriteToFile(const Unit &U, const std::string &Path);
31 void CopyFileToErr(const std::string &Path);
32 // Returns "Dir/FileName" or equivalent for the current OS.
33 std::string DirPlusFile(const std::string &DirPath,
34 const std::string &FileName);
36 size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
38 size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
39 size_t Size2, uint8_t *Out, size_t MaxOutSize);
41 void Print(const Unit &U, const char *PrintAfter = "");
42 void PrintASCII(const Unit &U, const char *PrintAfter = "");
43 std::string Hash(const Unit &U);
44 void SetTimer(int Seconds);
45 void PrintFileAsBase64(const std::string &Path);
46 void ExecuteCommand(const std::string &Command);
48 // Private copy of SHA1 implementation.
49 static const int kSHA1NumBytes = 20;
50 // Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
51 void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
53 int NumberOfCpuCores();
57 struct FuzzingOptions {
60 int UnitTimeoutSec = 300;
61 bool DoCrossOver = true;
63 bool ExitOnFirst = false;
64 bool UseCounters = false;
65 bool UseTraces = false;
66 bool UseFullCoverageSet = false;
68 int PreferSmallDuringInitialShuffle = -1;
69 size_t MaxNumberOfRuns = ULONG_MAX;
70 int SyncTimeout = 600;
71 std::string OutputCorpus;
72 std::string SyncCommand;
73 std::vector<std::string> Tokens;
75 Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
76 void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
77 void Loop(size_t NumIterations);
78 void ShuffleAndMinimize();
79 void InitializeTraceState();
80 size_t CorpusSize() const { return Corpus.size(); }
81 void ReadDir(const std::string &Path, long *Epoch) {
82 ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
84 void RereadOutputCorpus();
85 // Save the current corpus to OutputCorpus.
88 size_t secondsSinceProcessStartUp() {
89 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
93 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
95 static void StaticAlarmCallback();
97 Unit SubstituteTokens(const Unit &U) const;
100 void AlarmCallback();
101 void ExecuteCallback(const Unit &U);
102 void MutateAndTestOne(Unit *U);
103 void ReportNewCoverage(size_t NewCoverage, const Unit &U);
104 size_t RunOne(const Unit &U);
105 void RunOneAndUpdateCorpus(const Unit &U);
106 size_t RunOneMaximizeTotalCoverage(const Unit &U);
107 size_t RunOneMaximizeFullCoverageSet(const Unit &U);
108 size_t RunOneMaximizeCoveragePairs(const Unit &U);
109 void WriteToOutputCorpus(const Unit &U);
110 void WriteToCrash(const Unit &U, const char *Prefix);
111 void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
112 void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
116 // Trace-based fuzzing: we run a unit with some kind of tracing
117 // enabled and record potentially useful mutations. Then
118 // We apply these mutations one by one to the unit and run it again.
120 // Start tracing; forget all previously proposed mutations.
121 void StartTraceRecording();
122 // Stop tracing and return the number of proposed mutations.
123 size_t StopTraceRecording();
124 // Apply Idx-th trace-based mutation to U.
125 void ApplyTraceBasedMutation(size_t Idx, Unit *U);
127 void SetDeathCallback();
128 static void StaticDeathCallback();
129 void DeathCallback();
132 size_t TotalNumberOfRuns = 0;
134 std::vector<Unit> Corpus;
135 std::unordered_set<std::string> UnitHashesAddedToCorpus;
136 std::unordered_set<uintptr_t> FullCoverageSets;
139 std::vector<uint8_t> CounterBitmap;
140 size_t TotalBits() { // Slow. Call it only for printing stats.
142 for (auto x : CounterBitmap) Res += __builtin_popcount(x);
146 UserSuppliedFuzzer &USF;
147 FuzzingOptions Options;
148 system_clock::time_point ProcessStartTime = system_clock::now();
149 system_clock::time_point LastExternalSync = system_clock::now();
150 system_clock::time_point UnitStartTime;
151 long TimeOfLongestUnitInSeconds = 0;
152 long EpochOfLastReadOfOutputCorpus = 0;
155 class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
157 SimpleUserSuppliedFuzzer(UserCallback Callback) : Callback(Callback) {}
158 virtual void TargetFunction(const uint8_t *Data, size_t Size) {
159 return Callback(Data, Size);
163 UserCallback Callback;
166 }; // namespace fuzzer