1 // Copyright 2017 Google Inc. All Rights Reserved.
2 // Licensed under the Apache License, Version 2.0 (the "License");
3
4 // Example of a standalone runner for "fuzz targets".
5 // It reads all files passed as parameters and feeds their contents
6 // one by one into the fuzz target (LLVMFuzzerTestOneInput).
7 // This runner does not do any fuzzing, but allows us to run the fuzz target
8 // on the test corpus (e.g. "do_stuff_test_data") or on a single file,
9 // e.g. the one that comes from a bug report.
10
11 #include <cassert>
12 #include <iostream>
13 #include <fstream>
14 #include <vector>
15
16 // Forward declare the "fuzz target" interface.
17 // We deliberately keep this inteface simple and header-free.
18 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
19
main(int argc,char ** argv)20 int main(int argc, char **argv) {
21 for (int i = 1; i < argc; i++) {
22 std::ifstream in(argv[i]);
23 in.seekg(0, in.end);
24 size_t length = in.tellg();
25 in.seekg (0, in.beg);
26 std::cout << "Reading " << length << " bytes from " << argv[i] << std::endl;
27 // Allocate exactly length bytes so that we reliably catch buffer overflows.
28 std::vector<char> bytes(length);
29 in.read(bytes.data(), bytes.size());
30 assert(in);
31 LLVMFuzzerTestOneInput(reinterpret_cast<const uint8_t *>(bytes.data()),
32 bytes.size());
33 std::cout << "Execution successful" << std::endl;
34 }
35 return 0;
36 }
37