1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
//===- FuzzerInterface.h - Interface header for the Fuzzer ------*- C++ -* ===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Define the interface between the Fuzzer and the library being tested.
//===----------------------------------------------------------------------===//
// WARNING: keep the interface free of STL or any other header-based C++ lib,
// to avoid bad interactions between the code used in the fuzzer and
// the code used in the target function.
#ifndef LLVM_FUZZER_INTERFACE_H
#define LLVM_FUZZER_INTERFACE_H
#include <limits>
#include <cstddef>
#include <cstdint>
#include <vector>
#include <string>
namespace fuzzer {
/// Returns an int 0. Values other than zero are reserved for future.
typedef int (*UserCallback)(const uint8_t *Data, size_t Size);
/** Simple C-like interface with a single user-supplied callback.
Usage:
#\code
#include "FuzzerInterface.h"
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
DoStuffWithData(Data, Size);
return 0;
}
// Optional.
// Define this only if you need to read/modify argc/argv at startup
// and you are using libFuzzer's main().
// Must return 0.
int LLVMFuzzerInitialize(int *argc, char ***argv) {
ReadAndMaybeModify(argc, argv);
return 0;
}
// Implement your own main() or use the one from FuzzerMain.cpp.
int main(int argc, char **argv) {
InitializeMeIfNeeded();
return fuzzer::FuzzerDriver(argc, argv, LLVMFuzzerTestOneInput);
}
#\endcode
*/
int FuzzerDriver(int argc, char **argv, UserCallback Callback);
class FuzzerRandomBase {
public:
FuzzerRandomBase(){}
virtual ~FuzzerRandomBase(){};
virtual void ResetSeed(unsigned 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 n ? Rand() % n : 0; }
bool RandBool() { return Rand() % 2; }
};
// Using libc's stand/rand.
class FuzzerRandomLibc : public FuzzerRandomBase {
public:
FuzzerRandomLibc(unsigned int seed) { ResetSeed(seed); }
void ResetSeed(unsigned int seed) override;
~FuzzerRandomLibc() override {};
size_t Rand() override;
};
// Using std::mt19937
class FuzzerRandom_mt19937 : public FuzzerRandomBase {
public:
FuzzerRandom_mt19937(unsigned int seed) { ResetSeed(seed); }
void ResetSeed(unsigned int seed) override;
~FuzzerRandom_mt19937() override;
size_t Rand() override;
private:
struct Impl;
Impl *R = nullptr;
};
// For backward compatibility only, deprecated.
size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);
class MutationDispatcher;
/** An abstract class that allows to use user-supplied mutators with libFuzzer.
Usage:
#\code
#include "FuzzerInterface.h"
class MyFuzzer : public fuzzer::UserSuppliedFuzzer {
public:
MyFuzzer(fuzzer::FuzzerRandomBase *Rand);
// Must define the target function.
int TargetFunction(...) { ...; return 0; }
// Optionally define the mutator.
size_t Mutate(...) { ... }
// Optionally define the CrossOver method.
size_t CrossOver(...) { ... }
};
int main(int argc, char **argv) {
MyFuzzer F;
fuzzer::FuzzerDriver(argc, argv, F);
}
#\endcode
*/
class UserSuppliedFuzzer {
public:
UserSuppliedFuzzer(FuzzerRandomBase *Rand);
/// Executes the target function on 'Size' bytes of 'Data'.
virtual int TargetFunction(const uint8_t *Data, size_t Size) = 0;
/// Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
/// returns the new size of the data, which should be positive.
virtual size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
/// Crosses 'Data1' and 'Data2', writes up to 'MaxOutSize' bytes into Out,
/// returns the number of bytes written, which should be positive.
virtual size_t CrossOver(const uint8_t *Data1, size_t Size1,
const uint8_t *Data2, size_t Size2,
uint8_t *Out, size_t MaxOutSize);
virtual ~UserSuppliedFuzzer();
FuzzerRandomBase &GetRand() { return *Rand; }
MutationDispatcher &GetMD() { return *MD; }
private:
bool OwnRand = false;
FuzzerRandomBase *Rand;
MutationDispatcher *MD;
};
/// Runs the fuzzing with the UserSuppliedFuzzer.
int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF);
/// More C++-ish interface.
int FuzzerDriver(const std::vector<std::string> &Args, UserSuppliedFuzzer &USF);
int FuzzerDriver(const std::vector<std::string> &Args, UserCallback Callback);
} // namespace fuzzer
#endif // LLVM_FUZZER_INTERFACE_H
|
