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 several narrow ranges.
6 #include <cstdint>
7 #include <cstdio>
8 #include <cstdlib>
9 #include <cstring>
10
11 extern int AllLines[];
12
PrintOnce(int Line)13 bool PrintOnce(int Line) {
14 if (!AllLines[Line])
15 fprintf(stderr, "Seen line %d\n", Line);
16 AllLines[Line] = 1;
17 return true;
18 }
19
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)20 extern "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); // 8
28 memcpy(&y, Data + 8, 8); // 16
29 memcpy(&z, Data + 16, sizeof(z)); // 20
30 memcpy(&a, Data + 20, sizeof(a)); // 21
31 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
49 int AllLines[__LINE__ + 1]; // Must be the last line.
50