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fix libfuzzer custom mutator and add introspection function

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This commit is contained in:
van Hauser
2020-11-10 13:43:48 +01:00
parent 82d1c3e18d
commit 1661303248
6 changed files with 59 additions and 3 deletions
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24
custom_mutators/libfuzzer/FuzzerMutate.cpp
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@ -14,6 +14,8 @@
#include "FuzzerMutate.h"
#include "FuzzerOptions.h"
#include "FuzzerTracePC.h"
#include <random>
#include <chrono>
namespace fuzzer {
@ -100,15 +102,17 @@ size_t MutationDispatcher::Mutate_CustomCrossOver(uint8_t *Data, size_t Size,
}
size_t MutationDispatcher::Mutate_ShuffleBytes(uint8_t *Data, size_t Size,
size_t MaxSize) {
if (Size > MaxSize || Size == 0) return 0;
size_t ShuffleAmount =
Rand(std::min(Size, (size_t)8)) + 1; // [1,8] and <= Size.
size_t ShuffleStart = Rand(Size - ShuffleAmount);
assert(ShuffleStart + ShuffleAmount <= Size);
std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, Rand);
unsigned num = std::chrono::system_clock::now().time_since_epoch().count();
std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, std::default_random_engine(num));
//std::shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount, Rand);
return Size;
}
@ -609,8 +613,24 @@ void MutationDispatcher::PrintRecommendedDictionary() {
}
const char *MutationDispatcher::WriteMutationSequence() {
static std::string buf;
buf = "";
for (size_t i = 0; i < CurrentMutatorSequence.size(); i++) {
buf = buf + " " + CurrentMutatorSequence[i].Name;
}
return buf.c_str();
}
void MutationDispatcher::PrintMutationSequence(bool Verbose) {
return;
Printf("MS: %zd ", CurrentMutatorSequence.size());
size_t EntriesToPrint =
Verbose ? CurrentMutatorSequence.size()