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_EraseByte(uint8_t *Data, size_t size, size_t MaxSize,
37 FuzzerRandomBase &Rand);
38 size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
39 FuzzerRandomBase &Rand);
41 size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
42 size_t Size2, uint8_t *Out, size_t MaxOutSize,
43 FuzzerRandomBase &Rand);
45 void Printf(const char *Fmt, ...);
46 void Print(const Unit &U, const char *PrintAfter = "");
47 void PrintASCII(const Unit &U, const char *PrintAfter = "");
48 std::string Hash(const Unit &U);
49 void SetTimer(int Seconds);
50 void PrintFileAsBase64(const std::string &Path);
51 void ExecuteCommand(const std::string &Command);
53 // Private copy of SHA1 implementation.
54 static const int kSHA1NumBytes = 20;
55 // Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
56 void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
58 int NumberOfCpuCores();
62 struct FuzzingOptions {
65 int UnitTimeoutSec = 300;
66 bool DoCrossOver = true;
68 bool ExitOnFirst = false;
69 bool UseCounters = false;
70 bool UseTraces = false;
71 bool UseFullCoverageSet = false;
73 int PreferSmallDuringInitialShuffle = -1;
74 size_t MaxNumberOfRuns = ULONG_MAX;
75 int SyncTimeout = 600;
76 std::string OutputCorpus;
77 std::string SyncCommand;
78 std::vector<std::string> Tokens;
80 Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
81 void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
82 void Loop(size_t NumIterations);
83 void ShuffleAndMinimize();
84 void InitializeTraceState();
85 size_t CorpusSize() const { return Corpus.size(); }
86 void ReadDir(const std::string &Path, long *Epoch) {
87 ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
89 void RereadOutputCorpus();
90 // Save the current corpus to OutputCorpus.
93 size_t secondsSinceProcessStartUp() {
94 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
98 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
100 static void StaticAlarmCallback();
102 Unit SubstituteTokens(const Unit &U) const;
105 void AlarmCallback();
106 void ExecuteCallback(const Unit &U);
107 void MutateAndTestOne(Unit *U);
108 void ReportNewCoverage(size_t NewCoverage, const Unit &U);
109 size_t RunOne(const Unit &U);
110 void RunOneAndUpdateCorpus(const Unit &U);
111 size_t RunOneMaximizeTotalCoverage(const Unit &U);
112 size_t RunOneMaximizeFullCoverageSet(const Unit &U);
113 size_t RunOneMaximizeCoveragePairs(const Unit &U);
114 void WriteToOutputCorpus(const Unit &U);
115 void WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix);
116 void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
117 void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
121 // Trace-based fuzzing: we run a unit with some kind of tracing
122 // enabled and record potentially useful mutations. Then
123 // We apply these mutations one by one to the unit and run it again.
125 // Start tracing; forget all previously proposed mutations.
126 void StartTraceRecording();
127 // Stop tracing and return the number of proposed mutations.
128 size_t StopTraceRecording();
129 // Apply Idx-th trace-based mutation to U.
130 void ApplyTraceBasedMutation(size_t Idx, Unit *U);
132 void SetDeathCallback();
133 static void StaticDeathCallback();
134 void DeathCallback();
137 size_t TotalNumberOfRuns = 0;
139 std::vector<Unit> Corpus;
140 std::unordered_set<std::string> UnitHashesAddedToCorpus;
141 std::unordered_set<uintptr_t> FullCoverageSets;
144 std::vector<uint8_t> CounterBitmap;
145 size_t TotalBits() { // Slow. Call it only for printing stats.
147 for (auto x : CounterBitmap) Res += __builtin_popcount(x);
151 UserSuppliedFuzzer &USF;
152 FuzzingOptions Options;
153 system_clock::time_point ProcessStartTime = system_clock::now();
154 system_clock::time_point LastExternalSync = system_clock::now();
155 system_clock::time_point UnitStartTime;
156 long TimeOfLongestUnitInSeconds = 0;
157 long EpochOfLastReadOfOutputCorpus = 0;
160 class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
162 SimpleUserSuppliedFuzzer(FuzzerRandomBase *Rand, UserCallback Callback)
163 : UserSuppliedFuzzer(Rand), Callback(Callback) {}
164 virtual void TargetFunction(const uint8_t *Data, size_t Size) {
165 return Callback(Data, Size);
169 UserCallback Callback;
172 }; // namespace fuzzer