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envelope-from=alxndr@bu.edu; helo=NAM11-CO1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/20 21:08:14 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.441, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Thomas Huth , Alexander Bulekov , f4bug@amsat.org, darren.kenny@oracle.com, bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, dimastep@yandex-team.ru Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 --- 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) } +/* 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); + /* + * The fuzzer can specify a "Custom Crossover" function for combining two + * inputs from the corpus. This function is sometimes called by libfuzzer + * 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; void flush_events(QTestState *); @@ -91,6 +114,10 @@ void fuzz_qtest_set_serialize(bool option); */ void fuzz_add_target(const FuzzTarget *target); +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);