snappy_uncompress_fuzzer.cc (2475B)
1 // Copyright 2019 Google Inc. All Rights Reserved. 2 // 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following disclaimer 11 // in the documentation and/or other materials provided with the 12 // distribution. 13 // * Neither the name of Google Inc. nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 // 29 // libFuzzer harness for fuzzing snappy's decompression code. 30 31 #include <stddef.h> 32 #include <stdint.h> 33 34 #include <cassert> 35 #include <string> 36 37 #include "snappy.h" 38 39 // Entry point for LibFuzzer. 40 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { 41 std::string input(reinterpret_cast<const char*>(data), size); 42 43 // Avoid self-crafted decompression bombs. 44 size_t uncompressed_size; 45 constexpr size_t kMaxUncompressedSize = 1 << 20; 46 bool get_uncompressed_length_succeeded = snappy::GetUncompressedLength( 47 input.data(), input.size(), &uncompressed_size); 48 if (!get_uncompressed_length_succeeded || 49 (uncompressed_size > kMaxUncompressedSize)) { 50 return 0; 51 } 52 53 std::string uncompressed; 54 // The return value of snappy::Uncompress() is ignored because decompression 55 // will fail on invalid inputs. 56 snappy::Uncompress(input.data(), input.size(), &uncompressed); 57 return 0; 58 }