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Add new mutation strategy - callSeqGenFuncDuplicateAtRandom #424

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Add new mutation strategy - callSeqGenFuncDuplicateAtRandom #424

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8ba89fa
Add new mutation strategy - callSeqGenFuncDuplicateAtRandom
s4nsec Aug 1, 2024
22e5f5a
Merge branch 'master' into call-seq-mutation-logic
anishnaik Aug 25, 2024
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21 changes: 21 additions & 0 deletions fuzzing/fuzzer_worker_sequence_generator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,13 @@ func NewCallSequenceGenerator(worker *FuzzerWorker, config *CallSequenceGenerato
},
new(big.Int).SetUint64(config.RandomUnmodifiedCorpusTailWeight),
),
randomutils.NewWeightedRandomChoice(
CallSequenceGeneratorMutationStrategy{
CallSequenceGeneratorFunc: callSeqGenFuncDuplicateAtRandom,
PrefetchModifyCallFunc: nil,
},
new(big.Int).SetUint64(config.RandomUnmodifiedCorpusTailWeight),
),
randomutils.NewWeightedRandomChoice(
CallSequenceGeneratorMutationStrategy{
CallSequenceGeneratorFunc: callSeqGenFuncSpliceAtRandom,
Expand Down Expand Up @@ -380,6 +387,20 @@ func callSeqGenFuncCorpusTail(sequenceGenerator *CallSequenceGenerator, sequence
return nil
}

// callSeqGenFuncDuplicateAtRandom is a CallSequenceGeneratorFunc which prepares a CallSequenceGenerator to generate a sequence
// which duplicates a call sequence element at index N and inserts it at N+1
// if random index is len(sequence)-1, it inserts the duplicated call sequence element at N-1
func callSeqGenFuncDuplicateAtRandom(sequenceGenerator *CallSequenceGenerator, sequence calls.CallSequence) error {
randIndex := sequenceGenerator.worker.randomProvider.Intn(len(sequence))
duplicatedElement := sequence[randIndex]
if randIndex == len(sequence)-1 {
sequence[randIndex-1] = duplicatedElement
} else {
sequence[randIndex+1] = duplicatedElement
}
return nil
}

// callSeqGenFuncSpliceAtRandom is a CallSequenceGeneratorFunc which prepares a CallSequenceGenerator to generate a
// sequence which is based off of two corpus call sequence entries, from which a random length head and tail are
// respectively sliced and joined together.
Expand Down