diff options
author | Max Moroz <mmoroz@chromium.org> | 2018-07-16 17:50:46 +0000 |
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committer | Max Moroz <mmoroz@chromium.org> | 2018-07-16 17:50:46 +0000 |
commit | 5bbe2af12238b65ac38bb1530c85fb6660c4ef9e (patch) | |
tree | a5004c4a28822f03ef8090ccdd524d51e2836668 /lib/fuzzer/FuzzerMutate.cpp | |
parent | bb7bcc79811d249e5573f35ae39f65aff927dcea (diff) |
[libFuzzer] Mutation tracking and logging implemented.
Summary:
Code now exists to track number of mutations that are used in fuzzing in total
and ones that produce new coverage. The stats are currently being dumped to the
command line.
Patch by Kodé Williams (@kodewilliams).
Reviewers: metzman, Dor1s, morehouse, kcc
Reviewed By: Dor1s, morehouse, kcc
Subscribers: delcypher, kubamracek, kcc, morehouse, llvm-commits, #sanitizers, mgorny
Differential Revision: https://reviews.llvm.org/D48054
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@337194 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/fuzzer/FuzzerMutate.cpp')
-rw-r--r-- | lib/fuzzer/FuzzerMutate.cpp | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/lib/fuzzer/FuzzerMutate.cpp b/lib/fuzzer/FuzzerMutate.cpp index 865e598fd..e260aa3fe 100644 --- a/lib/fuzzer/FuzzerMutate.cpp +++ b/lib/fuzzer/FuzzerMutate.cpp @@ -465,6 +465,7 @@ void MutationDispatcher::RecordSuccessfulMutationSequence() { if (!PersistentAutoDictionary.ContainsWord(DE->GetW())) PersistentAutoDictionary.push_back({DE->GetW(), 1}); } + RecordUsefulMutations(); } void MutationDispatcher::PrintRecommendedDictionary() { @@ -486,7 +487,7 @@ void MutationDispatcher::PrintRecommendedDictionary() { void MutationDispatcher::PrintMutationSequence() { Printf("MS: %zd ", CurrentMutatorSequence.size()); for (auto M : CurrentMutatorSequence) - Printf("%s-", M.Name); + Printf("%s-", M->Name); if (!CurrentDictionaryEntrySequence.empty()) { Printf(" DE: "); for (auto DE : CurrentDictionaryEntrySequence) { @@ -514,12 +515,13 @@ size_t MutationDispatcher::MutateImpl(uint8_t *Data, size_t Size, // in which case they will return 0. // Try several times before returning un-mutated data. for (int Iter = 0; Iter < 100; Iter++) { - auto M = Mutators[Rand(Mutators.size())]; - size_t NewSize = (this->*(M.Fn))(Data, Size, MaxSize); + auto M = &Mutators[Rand(Mutators.size())]; + size_t NewSize = (this->*(M->Fn))(Data, Size, MaxSize); if (NewSize && NewSize <= MaxSize) { if (Options.OnlyASCII) ToASCII(Data, NewSize); CurrentMutatorSequence.push_back(M); + M->TotalCount++; return NewSize; } } @@ -532,4 +534,23 @@ void MutationDispatcher::AddWordToManualDictionary(const Word &W) { {W, std::numeric_limits<size_t>::max()}); } +void MutationDispatcher::RecordUsefulMutations() { + for (auto M : CurrentMutatorSequence) + M->UsefulCount++; +} + +void MutationDispatcher::PrintMutationStats() { + Printf("\nstat::mutation_usefulness: "); + for (size_t i = 0; i < Mutators.size(); i++) { + double UsefulPercentage = + Mutators[i].TotalCount + ? (100.0 * Mutators[i].UsefulCount) / Mutators[i].TotalCount + : 0; + Printf("%.3f", UsefulPercentage); + if (i < Mutators.size() - 1) + Printf(","); + } + Printf("\n"); +} + } // namespace fuzzer |