1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2 // See https://llvm.org/LICENSE.txt for license information.
3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4 
5 // Test that libFuzzer does not crash when LLVMFuzzerMutate called from
6 // LLVMFuzzerCustomCrossOver.
7 #include <algorithm>
8 #include <cstddef>
9 #include <cstdint>
10 #include <cstdlib>
11 #include <string.h>
12 #include <string>
13 #include <vector>
14 
15 #include "FuzzerInterface.h"
16 
17 static volatile int sink;
18 
19 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
20   std::string Str(reinterpret_cast<const char *>(Data), Size);
21   if (Size && Data[0] == '0')
22     sink++;
23   return 0;
24 }
25 
26 extern "C" size_t LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
27                                             const uint8_t *Data2, size_t Size2,
28                                             uint8_t *Out, size_t MaxOutSize,
29                                             unsigned int Seed) {
30   std::vector<uint8_t> Buffer(MaxOutSize * 10);
31   LLVMFuzzerMutate(Buffer.data(), Buffer.size(), Buffer.size());
32   size_t Size = std::min(Size1, MaxOutSize);
33   memcpy(Out, Data1, Size);
34   return Size;
35 }
36