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ae0620c4e9
Introduce -mllvm -sanitizer-coverage-8bit-counters=1 which adds imprecise thread-unfriendly 8-bit coverage counters. The run-time library maps these 8-bit counters to 8-bit bitsets in the same way AFL (http://lcamtuf.coredump.cx/afl/technical_details.txt) does: counter values are divided into 8 ranges and based on the counter value one of the bits in the bitset is set. The AFL ranges are used here: 1, 2, 3, 4-7, 8-15, 16-31, 32-127, 128+. These counters provide a search heuristic for single-threaded coverage-guided fuzzers, we do not expect them to be useful for other purposes. Depending on the value of -fsanitize-coverage=[123] flag, these counters will be added to the function entry blocks (=1), every basic block (=2), or every edge (=3). Use these counters as an optional search heuristic in the Fuzzer library. Add a test where this heuristic is critical. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231166 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// Define the main class fuzzer::Fuzzer and most functions.
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//===----------------------------------------------------------------------===//
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#include <cassert>
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#include <climits>
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#include <chrono>
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#include <cstddef>
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#include <cstdlib>
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#include <string>
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#include <vector>
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#include <unordered_set>
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#include "FuzzerInterface.h"
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namespace fuzzer {
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typedef std::vector<uint8_t> Unit;
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using namespace std::chrono;
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Unit ReadFile(const char *Path);
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void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V);
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void WriteToFile(const Unit &U, const std::string &Path);
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void CopyFileToErr(const std::string &Path);
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// Returns "Dir/FileName" or equivalent for the current OS.
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std::string DirPlusFile(const std::string &DirPath,
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const std::string &FileName);
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void Mutate(Unit *U, size_t MaxLen);
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void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen);
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void Print(const Unit &U, const char *PrintAfter = "");
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void PrintASCII(const Unit &U, const char *PrintAfter = "");
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std::string Hash(const Unit &U);
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void SetTimer(int Seconds);
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class Fuzzer {
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public:
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struct FuzzingOptions {
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int Verbosity = 1;
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int MaxLen = 0;
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bool DoCrossOver = true;
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int MutateDepth = 5;
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bool ExitOnFirst = false;
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bool UseCounters = false;
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bool UseFullCoverageSet = false;
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bool UseCoveragePairs = false;
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int PreferSmallDuringInitialShuffle = -1;
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size_t MaxNumberOfRuns = ULONG_MAX;
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std::string OutputCorpus;
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};
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Fuzzer(UserCallback Callback, FuzzingOptions Options)
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: Callback(Callback), Options(Options) {
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SetDeathCallback();
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}
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void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
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size_t Loop(size_t NumIterations);
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void ShuffleAndMinimize();
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size_t CorpusSize() const { return Corpus.size(); }
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void ReadDir(const std::string &Path) {
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ReadDirToVectorOfUnits(Path.c_str(), &Corpus);
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}
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// Save the current corpus to OutputCorpus.
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void SaveCorpus();
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size_t secondsSinceProcessStartUp() {
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return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
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.count();
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}
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size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
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static void AlarmCallback();
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private:
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size_t MutateAndTestOne(Unit *U);
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size_t RunOne(const Unit &U);
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size_t RunOneMaximizeTotalCoverage(const Unit &U);
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size_t RunOneMaximizeFullCoverageSet(const Unit &U);
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size_t RunOneMaximizeCoveragePairs(const Unit &U);
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void WriteToOutputCorpus(const Unit &U);
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static void WriteToCrash(const Unit &U, const char *Prefix);
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void SetDeathCallback();
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static void DeathCallback();
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static Unit CurrentUnit;
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size_t TotalNumberOfRuns = 0;
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std::vector<Unit> Corpus;
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std::unordered_set<uintptr_t> FullCoverageSets;
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std::unordered_set<uint64_t> CoveragePairs;
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// For UseCounters
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std::vector<uint8_t> CounterBitmap;
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size_t TotalBits() { // Slow. Call it only for printing stats.
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size_t Res = 0;
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for (auto x : CounterBitmap) Res += __builtin_popcount(x);
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return Res;
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}
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UserCallback Callback;
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FuzzingOptions Options;
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system_clock::time_point ProcessStartTime = system_clock::now();
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static system_clock::time_point UnitStartTime;
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};
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}; // namespace fuzzer
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