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 // Simple test for a fuzzer. The fuzzer must find the interesting switch value. 6 #include <cstddef> 7 #include <cstdint> 8 #include <cstdio> 9 #include <cstdlib> 10 #include <cstring> 11 12 static volatile int Sink; 13 14 template<class T> 15 bool Switch(const uint8_t *Data, size_t Size) { 16 T X; 17 if (Size < sizeof(X)) return false; 18 memcpy(&X, Data, sizeof(X)); 19 switch (X) { 20 case 1: Sink = __LINE__; break; 21 case 101: Sink = __LINE__; break; 22 case 1001: Sink = __LINE__; break; 23 case 10001: Sink = __LINE__; break; 24 case 100001: Sink = __LINE__; break; 25 case 1000001: Sink = __LINE__; break; 26 case 10000001: Sink = __LINE__; break; 27 case 100000001: return true; 28 } 29 return false; 30 } 31 32 bool ShortSwitch(const uint8_t *Data, size_t Size) { 33 short X; 34 if (Size < sizeof(short)) return false; 35 memcpy(&X, Data, sizeof(short)); 36 switch(X) { 37 case 42: Sink = __LINE__; break; 38 case 402: Sink = __LINE__; break; 39 case 4002: Sink = __LINE__; break; 40 case 5002: Sink = __LINE__; break; 41 case 7002: Sink = __LINE__; break; 42 case 9002: Sink = __LINE__; break; 43 case 14002: Sink = __LINE__; break; 44 case 21402: return true; 45 } 46 return false; 47 } 48 49 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { 50 if (Size >= 4 && Switch<int>(Data, Size) && 51 Size >= 12 && Switch<uint64_t>(Data + 4, Size - 4) && 52 Size >= 14 && ShortSwitch(Data + 12, 2) 53 ) { 54 fprintf(stderr, "BINGO; Found the target, exiting\n"); 55 exit(1); 56 } 57 return 0; 58 } 59 60