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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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13
custom_mutators/libfuzzer/FuzzerLoop.cpp
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@ -206,6 +206,8 @@ void Fuzzer::StaticDeathCallback() {
void Fuzzer::DumpCurrentUnit(const char *Prefix) {
return;
if (!CurrentUnitData) return; // Happens when running individual inputs.
ScopedDisableMsanInterceptorChecks S;
MD.PrintMutationSequence();
@ -733,6 +735,7 @@ std::string Fuzzer::WriteToOutputCorpus(const Unit &U) {
void Fuzzer::WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix) {
return;
if (!Options.SaveArtifacts) return;
std::string Path = Options.ArtifactPrefix + Prefix + Hash(U);
if (!Options.ExactArtifactPath.empty())
@ -1073,13 +1076,21 @@ void Fuzzer::MinimizeCrashLoop(const Unit &U) {
} // namespace fuzzer
#ifdef INTROSPECTION
extern const char *introspection_ptr;
#endif
extern "C" {
ATTRIBUTE_INTERFACE size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size,
size_t MaxSize) {
assert(fuzzer::F);
return fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
size_t r = fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
#ifdef INTROSPECTION
introspection_ptr = fuzzer::F->GetMD().WriteMutationSequence();
#endif
return r;
}