| // Copyright 2019 Google Inc. All Rights Reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| // |
| // libFuzzer harness for fuzzing snappy's decompression code. |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <cassert> |
| #include <string> |
| |
| #include "snappy.h" |
| |
| // Entry point for LibFuzzer. |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| std::string input(reinterpret_cast<const char*>(data), size); |
| |
| // Avoid self-crafted decompression bombs. |
| size_t uncompressed_size; |
| constexpr size_t kMaxUncompressedSize = 1 << 20; |
| bool get_uncompressed_length_succeeded = snappy::GetUncompressedLength( |
| input.data(), input.size(), &uncompressed_size); |
| if (!get_uncompressed_length_succeeded || |
| (uncompressed_size > kMaxUncompressedSize)) { |
| return 0; |
| } |
| |
| std::string uncompressed; |
| // The return value of snappy::Uncompress() is ignored because decompression |
| // will fail on invalid inputs. |
| snappy::Uncompress(input.data(), input.size(), &uncompressed); |
| return 0; |
| } |