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 //===----------------------------------------------------------------------===//
12 #ifndef LLVM_FUZZER_INTERNAL_H
13 #define LLVM_FUZZER_INTERNAL_H
22 #include <unordered_set>
24 #include "FuzzerInterface.h"
27 typedef std::vector<uint8_t> Unit;
28 using namespace std::chrono;
30 std::string FileToString(const std::string &Path);
31 Unit FileToVector(const std::string &Path);
32 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
34 void WriteToFile(const Unit &U, const std::string &Path);
35 void CopyFileToErr(const std::string &Path);
36 // Returns "Dir/FileName" or equivalent for the current OS.
37 std::string DirPlusFile(const std::string &DirPath,
38 const std::string &FileName);
40 void Printf(const char *Fmt, ...);
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 // Changes U to contain only ASCII (isprint+isspace) characters.
54 // Returns true iff U has been changed.
55 bool ToASCII(Unit &U);
56 bool IsASCII(const Unit &U);
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 int ReportSlowUnits = 10;
77 bool OnlyASCII = false;
80 std::string OutputCorpus;
81 std::string SyncCommand;
82 std::vector<std::string> Tokens;
84 Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
85 void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
86 void Loop(size_t NumIterations);
87 void ShuffleAndMinimize();
88 void InitializeTraceState();
89 size_t CorpusSize() const { return Corpus.size(); }
90 void ReadDir(const std::string &Path, long *Epoch) {
91 ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
93 void RereadOutputCorpus();
94 // Save the current corpus to OutputCorpus.
97 size_t secondsSinceProcessStartUp() {
98 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
102 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
104 static void StaticAlarmCallback();
106 Unit SubstituteTokens(const Unit &U) const;
109 void AlarmCallback();
110 void ExecuteCallback(const Unit &U);
111 void MutateAndTestOne(Unit *U);
112 void ReportNewCoverage(size_t NewCoverage, const Unit &U);
113 size_t RunOne(const Unit &U);
114 void RunOneAndUpdateCorpus(Unit &U);
115 size_t RunOneMaximizeTotalCoverage(const Unit &U);
116 size_t RunOneMaximizeFullCoverageSet(const Unit &U);
117 size_t RunOneMaximizeCoveragePairs(const Unit &U);
118 void WriteToOutputCorpus(const Unit &U);
119 void WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix);
120 void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
121 void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
125 // Trace-based fuzzing: we run a unit with some kind of tracing
126 // enabled and record potentially useful mutations. Then
127 // We apply these mutations one by one to the unit and run it again.
129 // Start tracing; forget all previously proposed mutations.
130 void StartTraceRecording();
131 // Stop tracing and return the number of proposed mutations.
132 size_t StopTraceRecording();
133 // Apply Idx-th trace-based mutation to U.
134 void ApplyTraceBasedMutation(size_t Idx, Unit *U);
136 void SetDeathCallback();
137 static void StaticDeathCallback();
138 void DeathCallback();
141 size_t TotalNumberOfRuns = 0;
142 size_t TotalNumberOfExecutedTraceBasedMutations = 0;
144 std::vector<Unit> Corpus;
145 std::unordered_set<std::string> UnitHashesAddedToCorpus;
146 std::unordered_set<uintptr_t> FullCoverageSets;
149 std::vector<uint8_t> CounterBitmap;
150 size_t TotalBits() { // Slow. Call it only for printing stats.
152 for (auto x : CounterBitmap) Res += __builtin_popcount(x);
156 UserSuppliedFuzzer &USF;
157 FuzzingOptions Options;
158 system_clock::time_point ProcessStartTime = system_clock::now();
159 system_clock::time_point LastExternalSync = system_clock::now();
160 system_clock::time_point UnitStartTime;
161 long TimeOfLongestUnitInSeconds = 0;
162 long EpochOfLastReadOfOutputCorpus = 0;
165 class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
167 SimpleUserSuppliedFuzzer(FuzzerRandomBase *Rand, UserCallback Callback)
168 : UserSuppliedFuzzer(Rand), Callback(Callback) {}
169 virtual void TargetFunction(const uint8_t *Data, size_t Size) {
170 return Callback(Data, Size);
174 UserCallback Callback;
177 }; // namespace fuzzer
179 #endif // LLVM_FUZZER_INTERNAL_H