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[libFuzzer] when printing the reproducer input, also print the base input and the mutation sequence

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llvm-svn: 278975
This commit is contained in:
Kostya Serebryany 2016-08-17 20:45:23 +00:00
parent 9ac8992a85
commit 4d034e34f6
3 changed files with 13 additions and 4 deletions
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2
lib/Fuzzer/FuzzerInternal.h
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@ -120,6 +120,7 @@ size_t GetPeakRSSMb();
static const int kSHA1NumBytes = 20;
// Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
std::string Sha1ToString(uint8_t Sha1[kSHA1NumBytes]);
// Changes U to contain only ASCII (isprint+isspace) characters.
// Returns true iff U has been changed.
@ -482,6 +483,7 @@ private:
void LazyAllocateCurrentUnitData();
uint8_t *CurrentUnitData = nullptr;
std::atomic<size_t> CurrentUnitSize;
uint8_t BaseSha1[kSHA1NumBytes]; // Checksum of the base unit.
size_t TotalNumberOfRuns = 0;
size_t NumberOfNewUnitsAdded = 0;

3
lib/Fuzzer/FuzzerLoop.cpp
View File

@ -204,6 +204,8 @@ void Fuzzer::StaticDeathCallback() {
void Fuzzer::DumpCurrentUnit(const char *Prefix) {
if (!CurrentUnitData) return; // Happens when running individual inputs.
MD.PrintMutationSequence();
Printf("; base unit: %s\n", Sha1ToString(BaseSha1).c_str());
size_t UnitSize = CurrentUnitSize;
if (UnitSize <= kMaxUnitSizeToPrint) {
PrintHexArray(CurrentUnitData, UnitSize, "\n");
@ -693,6 +695,7 @@ void Fuzzer::MutateAndTestOne() {
MD.StartMutationSequence();
auto &U = ChooseUnitToMutate();
ComputeSHA1(U.data(), U.size(), BaseSha1); // Remember where we started.
assert(CurrentUnitData);
size_t Size = U.size();
assert(Size <= Options.MaxLen && "Oversized Unit");

12
lib/Fuzzer/FuzzerUtil.cpp
View File

@ -63,13 +63,17 @@ void PrintASCII(const Unit &U, const char *PrintAfter) {
PrintASCII(U.data(), U.size(), PrintAfter);
}
std::string Sha1ToString(uint8_t Sha1[kSHA1NumBytes]) {
std::stringstream SS;
for (int i = 0; i < kSHA1NumBytes; i++)
SS << std::hex << std::setfill('0') << std::setw(2) << (unsigned)Sha1[i];
return SS.str();
}
std::string Hash(const Unit &U) {
uint8_t Hash[kSHA1NumBytes];
ComputeSHA1(U.data(), U.size(), Hash);
std::stringstream SS;
for (int i = 0; i < kSHA1NumBytes; i++)
SS << std::hex << std::setfill('0') << std::setw(2) << (unsigned)Hash[i];
return SS.str();
return Sha1ToString(Hash);
}
static void AlarmHandler(int, siginfo_t *, void *) {