| 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 | /** |
| 12 | * This fuzz target makes sure that whenever a compression dictionary can be |
| 13 | * loaded, the data can be round tripped. |
| 14 | */ |
| 15 | |
| 16 | #include <stddef.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <stdio.h> |
| 19 | #include <string.h> |
| 20 | #include "fuzz_helpers.h" |
| 21 | #include "zstd_helpers.h" |
| 22 | #include "fuzz_data_producer.h" |
| 23 | #include "fuzz_third_party_seq_prod.h" |
| 24 | |
| 25 | /** |
| 26 | * Compresses the data and returns the compressed size or an error. |
| 27 | */ |
| 28 | static size_t compress(void* compressed, size_t compressedCapacity, |
| 29 | void const* source, size_t sourceSize, |
| 30 | void const* dict, size_t dictSize, |
| 31 | ZSTD_dictLoadMethod_e dictLoadMethod, |
| 32 | ZSTD_dictContentType_e dictContentType, |
| 33 | int const refPrefix) |
| 34 | { |
| 35 | ZSTD_CCtx* cctx = ZSTD_createCCtx(); |
| 36 | if (refPrefix) |
| 37 | FUZZ_ZASSERT(ZSTD_CCtx_refPrefix_advanced( |
| 38 | cctx, dict, dictSize, dictContentType)); |
| 39 | else |
| 40 | FUZZ_ZASSERT(ZSTD_CCtx_loadDictionary_advanced( |
| 41 | cctx, dict, dictSize, dictLoadMethod, dictContentType)); |
| 42 | size_t const compressedSize = ZSTD_compress2( |
| 43 | cctx, compressed, compressedCapacity, source, sourceSize); |
| 44 | ZSTD_freeCCtx(cctx); |
| 45 | return compressedSize; |
| 46 | } |
| 47 | |
| 48 | static size_t decompress(void* result, size_t resultCapacity, |
| 49 | void const* compressed, size_t compressedSize, |
| 50 | void const* dict, size_t dictSize, |
| 51 | ZSTD_dictLoadMethod_e dictLoadMethod, |
| 52 | ZSTD_dictContentType_e dictContentType, |
| 53 | int const refPrefix) |
| 54 | { |
| 55 | ZSTD_DCtx* dctx = ZSTD_createDCtx(); |
| 56 | if (refPrefix) |
| 57 | FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced( |
| 58 | dctx, dict, dictSize, dictContentType)); |
| 59 | else |
| 60 | FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced( |
| 61 | dctx, dict, dictSize, dictLoadMethod, dictContentType)); |
| 62 | size_t const resultSize = ZSTD_decompressDCtx( |
| 63 | dctx, result, resultCapacity, compressed, compressedSize); |
| 64 | FUZZ_ZASSERT(resultSize); |
| 65 | ZSTD_freeDCtx(dctx); |
| 66 | return resultSize; |
| 67 | } |
| 68 | |
| 69 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
| 70 | { |
| 71 | FUZZ_SEQ_PROD_SETUP(); |
| 72 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
| 73 | int const refPrefix = FUZZ_dataProducer_uint32Range(producer, 0, 1) != 0; |
| 74 | ZSTD_dictLoadMethod_e const dlm = |
| 75 | size = FUZZ_dataProducer_uint32Range(producer, 0, 1); |
| 76 | ZSTD_dictContentType_e const dct = |
| 77 | FUZZ_dataProducer_uint32Range(producer, 0, 2); |
| 78 | size = FUZZ_dataProducer_remainingBytes(producer); |
| 79 | |
| 80 | DEBUGLOG(2, "Dict load method %d", dlm); |
| 81 | DEBUGLOG(2, "Dict content type %d", dct); |
| 82 | DEBUGLOG(2, "Dict size %u", (unsigned)size); |
| 83 | |
| 84 | void* const rBuf = FUZZ_malloc(size); |
| 85 | size_t const cBufSize = ZSTD_compressBound(size); |
| 86 | void* const cBuf = FUZZ_malloc(cBufSize); |
| 87 | |
| 88 | size_t const cSize = |
| 89 | compress(cBuf, cBufSize, src, size, src, size, dlm, dct, refPrefix); |
| 90 | /* compression failing is okay */ |
| 91 | if (ZSTD_isError(cSize)) { |
| 92 | FUZZ_ASSERT_MSG(dct != ZSTD_dct_rawContent, "Raw must always succeed!"); |
| 93 | goto out; |
| 94 | } |
| 95 | size_t const rSize = |
| 96 | decompress(rBuf, size, cBuf, cSize, src, size, dlm, dct, refPrefix); |
| 97 | FUZZ_ASSERT_MSG(rSize == size, "Incorrect regenerated size"); |
| 98 | FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!"); |
| 99 | |
| 100 | out: |
| 101 | free(cBuf); |
| 102 | free(rBuf); |
| 103 | FUZZ_dataProducer_free(producer); |
| 104 | FUZZ_SEQ_PROD_TEARDOWN(); |
| 105 | return 0; |
| 106 | } |