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
15 #include "FuzzerDefs.h"
16 #include "FuzzerExtFunctions.h"
17 #include "FuzzerInterface.h"
18 #include "FuzzerOptions.h"
19 #include "FuzzerSHA1.h"
20 #include "FuzzerValueBitMap.h"
30 using namespace std::chrono;
35 // Aggregates all available coverage measurements.
37 Coverage() { Reset(); }
41 CallerCalleeCoverage = 0;
42 CounterBitmapBits = 0;
43 CounterBitmap.clear();
48 size_t CallerCalleeCoverage;
49 // Precalculated number of bits in CounterBitmap.
50 size_t CounterBitmapBits;
51 std::vector<uint8_t> CounterBitmap;
55 Fuzzer(UserCallback CB, InputCorpus &Corpus, MutationDispatcher &MD,
56 FuzzingOptions Options);
59 void MinimizeCrashLoop(const Unit &U);
60 void ShuffleAndMinimize(UnitVector *V);
61 void InitializeTraceState();
62 void RereadOutputCorpus(size_t MaxSize);
64 size_t secondsSinceProcessStartUp() {
65 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
70 return Options.MaxTotalTimeSec > 0 &&
71 secondsSinceProcessStartUp() >
72 static_cast<size_t>(Options.MaxTotalTimeSec);
76 size_t Seconds = secondsSinceProcessStartUp();
77 return Seconds ? TotalNumberOfRuns / Seconds : 0;
80 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
82 static void StaticAlarmCallback();
83 static void StaticCrashSignalCallback();
84 static void StaticInterruptCallback();
85 static void StaticFileSizeExceedCallback();
87 void ExecuteCallback(const uint8_t *Data, size_t Size);
88 size_t RunOne(const uint8_t *Data, size_t Size);
90 // Merge Corpora[1:] into Corpora[0].
91 void Merge(const std::vector<std::string> &Corpora);
92 void CrashResistantMerge(const std::vector<std::string> &Args,
93 const std::vector<std::string> &Corpora);
94 void CrashResistantMergeInternalStep(const std::string &ControlFilePath);
95 // Returns a subset of 'Extra' that adds coverage to 'Initial'.
96 UnitVector FindExtraUnits(const UnitVector &Initial, const UnitVector &Extra);
97 MutationDispatcher &GetMD() { return MD; }
98 void PrintFinalStats();
99 void SetMaxInputLen(size_t MaxInputLen);
100 void SetMaxMutationLen(size_t MaxMutationLen);
101 void RssLimitCallback();
104 void ResetCoverage();
106 bool InFuzzingThread() const { return IsMyThread; }
107 size_t GetCurrentUnitInFuzzingThead(const uint8_t **Data) const;
108 void TryDetectingAMemoryLeak(const uint8_t *Data, size_t Size,
109 bool DuringInitialCorpusExecution);
111 void HandleMalloc(size_t Size);
114 void AlarmCallback();
115 void CrashCallback();
116 void InterruptCallback();
117 void MutateAndTestOne();
118 void ReportNewCoverage(InputInfo *II, const Unit &U);
119 size_t RunOne(const Unit &U) { return RunOne(U.data(), U.size()); }
120 void WriteToOutputCorpus(const Unit &U);
121 void WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix);
122 void PrintStats(const char *Where, const char *End = "\n", size_t Units = 0);
123 void PrintStatusForNewUnit(const Unit &U);
124 void ShuffleCorpus(UnitVector *V);
125 void AddToCorpus(const Unit &U);
126 void CheckExitOnSrcPosOrItem();
128 // Trace-based fuzzing: we run a unit with some kind of tracing
129 // enabled and record potentially useful mutations. Then
130 // We apply these mutations one by one to the unit and run it again.
132 // Start tracing; forget all previously proposed mutations.
133 void StartTraceRecording();
135 void StopTraceRecording();
137 void SetDeathCallback();
138 static void StaticDeathCallback();
139 void DumpCurrentUnit(const char *Prefix);
140 void DeathCallback();
142 void ResetEdgeCoverage();
143 void ResetCounters();
144 void PrepareCounters(Fuzzer::Coverage *C);
145 bool RecordMaxCoverage(Fuzzer::Coverage *C);
147 void AllocateCurrentUnitData();
148 uint8_t *CurrentUnitData = nullptr;
149 std::atomic<size_t> CurrentUnitSize;
150 uint8_t BaseSha1[kSHA1NumBytes]; // Checksum of the base unit.
151 bool RunningCB = false;
153 size_t TotalNumberOfRuns = 0;
154 size_t NumberOfNewUnitsAdded = 0;
156 bool HasMoreMallocsThanFrees = false;
157 size_t NumberOfLeakDetectionAttempts = 0;
161 MutationDispatcher &MD;
162 FuzzingOptions Options;
164 system_clock::time_point ProcessStartTime = system_clock::now();
165 system_clock::time_point UnitStartTime, UnitStopTime;
166 long TimeOfLongestUnitInSeconds = 0;
167 long EpochOfLastReadOfOutputCorpus = 0;
169 // Maximum recorded coverage.
170 Coverage MaxCoverage;
172 size_t MaxInputLen = 0;
173 size_t MaxMutationLen = 0;
175 // Need to know our own thread.
176 static thread_local bool IsMyThread;
178 bool InMergeMode = false;
181 }; // namespace fuzzer
183 #endif // LLVM_FUZZER_INTERNAL_H