| 1 | /* |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This source code is licensed under both the BSD-style license (found in the |
| 6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| 7 | * in the COPYING file in the root directory of this source tree). |
| 8 | * You may select, at your option, one of the above-listed licenses. |
| 9 | */ |
| 10 | |
| 11 | #include "zstd.h" |
| 12 | #include "zstd_seekable.h" |
| 13 | #include "fuzz_helpers.h" |
| 14 | #include "fuzz_data_producer.h" |
| 15 | |
| 16 | static ZSTD_seekable *stream = NULL; |
| 17 | static ZSTD_seekable_CStream *zscs = NULL; |
| 18 | static const size_t kSeekableOverheadSize = ZSTD_seekTableFooterSize; |
| 19 | |
| 20 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
| 21 | { |
| 22 | /* Give a random portion of src data to the producer, to use for |
| 23 | parameter generation. The rest will be used for (de)compression */ |
| 24 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
| 25 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
| 26 | size_t const compressedBufferSize = ZSTD_compressBound(size) + kSeekableOverheadSize; |
| 27 | uint8_t* compressedBuffer = (uint8_t*)malloc(compressedBufferSize); |
| 28 | uint8_t* decompressedBuffer = (uint8_t*)malloc(size); |
| 29 | |
| 30 | int const cLevel = FUZZ_dataProducer_int32Range(producer, ZSTD_minCLevel(), ZSTD_maxCLevel()); |
| 31 | unsigned const checksumFlag = FUZZ_dataProducer_int32Range(producer, 0, 1); |
| 32 | size_t const uncompressedSize = FUZZ_dataProducer_uint32Range(producer, 0, size); |
| 33 | size_t const offset = FUZZ_dataProducer_uint32Range(producer, 0, size - uncompressedSize); |
| 34 | size_t seekSize; |
| 35 | |
| 36 | if (!zscs) { |
| 37 | zscs = ZSTD_seekable_createCStream(); |
| 38 | FUZZ_ASSERT(zscs); |
| 39 | } |
| 40 | if (!stream) { |
| 41 | stream = ZSTD_seekable_create(); |
| 42 | FUZZ_ASSERT(stream); |
| 43 | } |
| 44 | |
| 45 | { /* Perform a compression */ |
| 46 | size_t const initStatus = ZSTD_seekable_initCStream(zscs, cLevel, checksumFlag, size); |
| 47 | size_t endStatus; |
| 48 | ZSTD_outBuffer out = { .dst=compressedBuffer, .pos=0, .size=compressedBufferSize }; |
| 49 | ZSTD_inBuffer in = { .src=src, .pos=0, .size=size }; |
| 50 | FUZZ_ASSERT(!ZSTD_isError(initStatus)); |
| 51 | |
| 52 | do { |
| 53 | size_t cSize = ZSTD_seekable_compressStream(zscs, &out, &in); |
| 54 | FUZZ_ASSERT(!ZSTD_isError(cSize)); |
| 55 | } while (in.pos != in.size); |
| 56 | |
| 57 | FUZZ_ASSERT(in.pos == in.size); |
| 58 | endStatus = ZSTD_seekable_endStream(zscs, &out); |
| 59 | FUZZ_ASSERT(!ZSTD_isError(endStatus)); |
| 60 | seekSize = out.pos; |
| 61 | } |
| 62 | |
| 63 | { /* Decompress at an offset */ |
| 64 | size_t const initStatus = ZSTD_seekable_initBuff(stream, compressedBuffer, seekSize); |
| 65 | size_t decompressedBytesTotal = 0; |
| 66 | size_t dSize; |
| 67 | |
| 68 | FUZZ_ZASSERT(initStatus); |
| 69 | do { |
| 70 | dSize = ZSTD_seekable_decompress(stream, decompressedBuffer, uncompressedSize, offset); |
| 71 | FUZZ_ASSERT(!ZSTD_isError(dSize)); |
| 72 | decompressedBytesTotal += dSize; |
| 73 | } while (decompressedBytesTotal < uncompressedSize && dSize > 0); |
| 74 | FUZZ_ASSERT(decompressedBytesTotal == uncompressedSize); |
| 75 | } |
| 76 | |
| 77 | FUZZ_ASSERT_MSG(!FUZZ_memcmp(src+offset, decompressedBuffer, uncompressedSize), "Corruption!"); |
| 78 | |
| 79 | free(decompressedBuffer); |
| 80 | free(compressedBuffer); |
| 81 | FUZZ_dataProducer_free(producer); |
| 82 | |
| 83 | #ifndef STATEFUL_FUZZING |
| 84 | ZSTD_seekable_free(stream); stream = NULL; |
| 85 | ZSTD_seekable_freeCStream(zscs); zscs = NULL; |
| 86 | #endif |
| 87 | return 0; |
| 88 | } |