1 // This file is distributed under the University of Illinois Open Source
2 // License. See LICENSE.TXT for details.
3
4 // Simple test for a cutom mutator.
5 #include <assert.h>
6 #include <cstddef>
7 #include <cstdint>
8 #include <cstdlib>
9 #include <iostream>
10 #include <random>
11 #include <string.h>
12
13 #include "FuzzerInterface.h"
14
15 static const char *Separator = "-_^_-";
16 static const char *Target = "012-_^_-abc";
17
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)18 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
19 assert(Data);
20 std::string Str(reinterpret_cast<const char *>(Data), Size);
21
22 if (Str.find(Target) != std::string::npos) {
23 std::cout << "BINGO; Found the target, exiting\n";
24 exit(1);
25 }
26 return 0;
27 }
28
LLVMFuzzerCustomCrossOver(const uint8_t * Data1,size_t Size1,const uint8_t * Data2,size_t Size2,uint8_t * Out,size_t MaxOutSize,unsigned int Seed)29 extern "C" size_t LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
30 const uint8_t *Data2, size_t Size2,
31 uint8_t *Out, size_t MaxOutSize,
32 unsigned int Seed) {
33 static bool Printed;
34 static size_t SeparatorLen = strlen(Separator);
35
36 if (!Printed) {
37 std::cerr << "In LLVMFuzzerCustomCrossover\n";
38 Printed = true;
39 }
40
41 std::mt19937 R(Seed);
42
43 size_t Offset1 = 0;
44 size_t Len1 = R() % (Size1 - Offset1);
45 size_t Offset2 = 0;
46 size_t Len2 = R() % (Size2 - Offset2);
47 size_t Size = Len1 + Len2 + SeparatorLen;
48
49 if (Size > MaxOutSize)
50 return 0;
51
52 memcpy(Out, Data1 + Offset1, Len1);
53 memcpy(Out + Len1, Separator, SeparatorLen);
54 memcpy(Out + Len1 + SeparatorLen, Data2 + Offset2, Len2);
55
56 return Len1 + Len2 + SeparatorLen;
57 }
58