*/
int FuzzerDriver(int argc, char **argv, UserCallback Callback);
+class FuzzerRandomBase {
+ public:
+ FuzzerRandomBase(){}
+ virtual ~FuzzerRandomBase(){};
+ virtual void ResetSeed(int seed) = 0;
+ // Return a random number.
+ virtual size_t Rand() = 0;
+ // Return a random number in range [0,n).
+ size_t operator()(size_t n) { return Rand() % n; }
+ bool RandBool() { return Rand() % 2; }
+};
+
+class FuzzerRandomLibc : public FuzzerRandomBase {
+ public:
+ FuzzerRandomLibc(int seed) { ResetSeed(seed); }
+ void ResetSeed(int seed) override;
+ ~FuzzerRandomLibc() override {}
+ size_t Rand() override;
+};
+
/** An abstract class that allows to use user-supplied mutators with libFuzzer.
Usage:
#include "FuzzerInterface.h"
class MyFuzzer : public fuzzer::UserSuppliedFuzzer {
public:
+ MyFuzzer(fuzzer::FuzzerRandomBase *Rand);
// Must define the target function.
void TargetFunction(...) { ... }
// Optionally define the mutator.
*/
class UserSuppliedFuzzer {
public:
+ UserSuppliedFuzzer(); // Deprecated, don't use.
+ UserSuppliedFuzzer(FuzzerRandomBase *Rand);
/// Executes the target function on 'Size' bytes of 'Data'.
virtual void TargetFunction(const uint8_t *Data, size_t Size) = 0;
/// Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
uint8_t *Out, size_t MaxOutSize) {
return BasicCrossOver(Data1, Size1, Data2, Size2, Out, MaxOutSize);
}
- virtual ~UserSuppliedFuzzer() {}
+ virtual ~UserSuppliedFuzzer();
+
+ FuzzerRandomBase &GetRand() { return *Rand; }
protected:
/// These can be called internally by Mutate and CrossOver.
size_t BasicCrossOver(const uint8_t *Data1, size_t Size1,
const uint8_t *Data2, size_t Size2,
uint8_t *Out, size_t MaxOutSize);
+ private:
+ bool OwnRand = false;
+ FuzzerRandomBase *Rand;
};
/// Runs the fuzzing with the UserSuppliedFuzzer.