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 Printf(const char *Fmt, ...);
42 void Print(const Unit &U, const char *PrintAfter = "");
43 void PrintASCII(const Unit &U, const char *PrintAfter = "");
44 std::string Hash(const Unit &U);
45 void SetTimer(int Seconds);
46 void PrintFileAsBase64(const std::string &Path);
47 void ExecuteCommand(const std::string &Command);
49 // Private copy of SHA1 implementation.
50 static const int kSHA1NumBytes = 20;
51 // Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
52 void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
54 int NumberOfCpuCores();
58 struct FuzzingOptions {
61 int UnitTimeoutSec = 300;
62 bool DoCrossOver = true;
64 bool ExitOnFirst = false;
65 bool UseCounters = false;
66 bool UseTraces = false;
67 bool UseFullCoverageSet = false;
69 int PreferSmallDuringInitialShuffle = -1;
70 size_t MaxNumberOfRuns = ULONG_MAX;
71 int SyncTimeout = 600;
72 std::string OutputCorpus;
73 std::string SyncCommand;
74 std::vector<std::string> Tokens;
76 Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
77 void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
78 void Loop(size_t NumIterations);
79 void ShuffleAndMinimize();
80 void InitializeTraceState();
81 size_t CorpusSize() const { return Corpus.size(); }
82 void ReadDir(const std::string &Path, long *Epoch) {
83 ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
85 void RereadOutputCorpus();
86 // Save the current corpus to OutputCorpus.
89 size_t secondsSinceProcessStartUp() {
90 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
94 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
96 static void StaticAlarmCallback();
98 Unit SubstituteTokens(const Unit &U) const;
101 void AlarmCallback();
102 void ExecuteCallback(const Unit &U);
103 void MutateAndTestOne(Unit *U);
104 void ReportNewCoverage(size_t NewCoverage, const Unit &U);
105 size_t RunOne(const Unit &U);
106 void RunOneAndUpdateCorpus(const Unit &U);
107 size_t RunOneMaximizeTotalCoverage(const Unit &U);
108 size_t RunOneMaximizeFullCoverageSet(const Unit &U);
109 size_t RunOneMaximizeCoveragePairs(const Unit &U);
110 void WriteToOutputCorpus(const Unit &U);
111 void WriteToCrash(const Unit &U, const char *Prefix);
112 void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
113 void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
117 // Trace-based fuzzing: we run a unit with some kind of tracing
118 // enabled and record potentially useful mutations. Then
119 // We apply these mutations one by one to the unit and run it again.
121 // Start tracing; forget all previously proposed mutations.
122 void StartTraceRecording();
123 // Stop tracing and return the number of proposed mutations.
124 size_t StopTraceRecording();
125 // Apply Idx-th trace-based mutation to U.
126 void ApplyTraceBasedMutation(size_t Idx, Unit *U);
128 void SetDeathCallback();
129 static void StaticDeathCallback();
130 void DeathCallback();
133 size_t TotalNumberOfRuns = 0;
135 std::vector<Unit> Corpus;
136 std::unordered_set<std::string> UnitHashesAddedToCorpus;
137 std::unordered_set<uintptr_t> FullCoverageSets;
140 std::vector<uint8_t> CounterBitmap;
141 size_t TotalBits() { // Slow. Call it only for printing stats.
143 for (auto x : CounterBitmap) Res += __builtin_popcount(x);
147 UserSuppliedFuzzer &USF;
148 FuzzingOptions Options;
149 system_clock::time_point ProcessStartTime = system_clock::now();
150 system_clock::time_point LastExternalSync = system_clock::now();
151 system_clock::time_point UnitStartTime;
152 long TimeOfLongestUnitInSeconds = 0;
153 long EpochOfLastReadOfOutputCorpus = 0;
156 class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
158 SimpleUserSuppliedFuzzer(UserCallback Callback) : Callback(Callback) {}
159 virtual void TargetFunction(const uint8_t *Data, size_t Size) {
160 return Callback(Data, Size);
164 UserCallback Callback;
167 }; // namespace fuzzer