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charset="utf-8" From: Alexander Bulekov libfuzzer supports a "custom crossover function". Libfuzzer often tries to blend two inputs to create a new interesting input. Sometimes, we have a better idea about how to blend inputs together. This change allows fuzzers to specify a custom function for blending two inputs together. Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny Message-Id: <20201023150746.107063-8-alxndr@bu.edu> Signed-off-by: Thomas Huth --- tests/qtest/fuzz/fuzz.c | 13 +++++++++++++ tests/qtest/fuzz/fuzz.h | 27 +++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/tests/qtest/fuzz/fuzz.c b/tests/qtest/fuzz/fuzz.c index eb0070437f..7be7226bc0 100644 --- a/tests/qtest/fuzz/fuzz.c +++ b/tests/qtest/fuzz/fuzz.c @@ -118,6 +118,19 @@ static FuzzTarget *fuzz_get_target(char* name) } =20 =20 +/* Sometimes called by libfuzzer to mutate two inputs into one */ +size_t LLVMFuzzerCustomCrossOver(const uint8_t *data1, size_t size1, + const uint8_t *data2, size_t size2, + uint8_t *out, size_t max_out_size, + unsigned int seed) +{ + if (fuzz_target->crossover) { + return fuzz_target->crossover(data1, size1, data2, size2, out, + max_out_size, seed); + } + return 0; +} + /* Executed for each fuzzing-input */ int LLVMFuzzerTestOneInput(const unsigned char *Data, size_t Size) { diff --git a/tests/qtest/fuzz/fuzz.h b/tests/qtest/fuzz/fuzz.h index 8eb765edc8..ed9ce17154 100644 --- a/tests/qtest/fuzz/fuzz.h +++ b/tests/qtest/fuzz/fuzz.h @@ -77,6 +77,29 @@ typedef struct FuzzTarget { */ void(*fuzz)(QTestState *, const unsigned char *, size_t); =20 + /* + * The fuzzer can specify a "Custom Crossover" function for combining = two + * inputs from the corpus. This function is sometimes called by libfuz= zer + * when mutating inputs. + * + * data1: location of first input + * size1: length of first input + * data1: location of second input + * size1: length of second input + * out: where to place the resulting, mutated input + * max_out_size: the maximum length of the input that can be placed in= out + * seed: the seed that should be used to make mutations deterministic,= when + * needed + * + * See libfuzzer's LLVMFuzzerCustomCrossOver API for more info. + * + * Can be NULL + */ + size_t(*crossover)(const uint8_t *data1, size_t size1, + const uint8_t *data2, size_t size2, + uint8_t *out, size_t max_out_size, + unsigned int seed); + } FuzzTarget; =20 void flush_events(QTestState *); @@ -91,6 +114,10 @@ void fuzz_qtest_set_serialize(bool option); */ void fuzz_add_target(const FuzzTarget *target); =20 +size_t LLVMFuzzerCustomCrossOver(const uint8_t *data1, size_t size1, + const uint8_t *data2, size_t size2, + uint8_t *out, size_t max_out_size, + unsigned int seed); int LLVMFuzzerTestOneInput(const unsigned char *Data, size_t Size); int LLVMFuzzerInitialize(int *argc, char ***argv, char ***envp); =20 --=20 2.18.2