@@ -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)
{
@@ -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);