50 lines · cpp
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-exception4 5// Simple test for a fuzzer. The fuzzer must find several narrow ranges.6#include <cstdint>7#include <cstdio>8#include <cstdlib>9#include <cstring>10 11extern int AllLines[];12 13bool PrintOnce(int Line) {14 if (!AllLines[Line])15 fprintf(stderr, "Seen line %d\n", Line);16 AllLines[Line] = 1;17 return true;18}19 20extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {21 if (Size != 21)22 return 0;23 uint64_t x = 0;24 int64_t y = 0;25 int32_t z = 0;26 uint8_t a = 0;27 memcpy(&x, Data, 8); // 828 memcpy(&y, Data + 8, 8); // 1629 memcpy(&z, Data + 16, sizeof(z)); // 2030 memcpy(&a, Data + 20, sizeof(a)); // 2131 const bool k32bit = sizeof(void*) == 4;32 33 if ((k32bit || x > 1234567890) && PrintOnce(__LINE__) &&34 (k32bit || x < 1234567895) && PrintOnce(__LINE__) &&35 a == 0x42 && PrintOnce(__LINE__) &&36 (k32bit || y >= 987654321) && PrintOnce(__LINE__) &&37 (k32bit || y <= 987654325) && PrintOnce(__LINE__) &&38 z < -10000 && PrintOnce(__LINE__) &&39 z >= -10005 && PrintOnce(__LINE__) &&40 z != -10003 && PrintOnce(__LINE__) &&41 true) {42 fprintf(stderr, "BINGO; Found the target: size %zd (%zd, %zd, %d, %d), exiting.\n",43 Size, x, y, z, a);44 exit(1);45 }46 return 0;47}48 49int AllLines[__LINE__ + 1]; // Must be the last line.50