| 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 performs a zstd round-trip test (compress & decompress) with |
| 13 | * a dictionary, compares the result with the original, and calls abort() on |
| 14 | * corruption. |
| 15 | */ |
| 16 | |
| 17 | #include <stddef.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include "fuzz_helpers.h" |
| 22 | #include "zstd_helpers.h" |
| 23 | #include "fuzz_data_producer.h" |
| 24 | #include "fuzz_third_party_seq_prod.h" |
| 25 | |
| 26 | static ZSTD_CCtx* cctx = NULL; |
| 27 | static ZSTD_DCtx* dctx = NULL; |
| 28 | |
| 29 | static size_t roundTripTest(void* result, size_t resultCapacity, |
| 30 | void* compressed, size_t compressedCapacity, |
| 31 | const void* src, size_t srcSize, |
| 32 | FUZZ_dataProducer_t* producer) |
| 33 | { |
| 34 | ZSTD_dictContentType_e dictContentType = ZSTD_dct_auto; |
| 35 | FUZZ_dict_t dict = FUZZ_train(src, srcSize, producer); |
| 36 | int const refPrefix = FUZZ_dataProducer_uint32Range(producer, 0, 1) != 0; |
| 37 | size_t cSize; |
| 38 | if (FUZZ_dataProducer_uint32Range(producer, 0, 15) == 0) { |
| 39 | int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel); |
| 40 | |
| 41 | cSize = ZSTD_compress_usingDict(cctx, |
| 42 | compressed, compressedCapacity, |
| 43 | src, srcSize, |
| 44 | dict.buff, dict.size, |
| 45 | cLevel); |
| 46 | FUZZ_ZASSERT(cSize); |
| 47 | // Compress a second time and check for determinism |
| 48 | { |
| 49 | size_t const cSize0 = cSize; |
| 50 | XXH64_hash_t const hash0 = XXH64(compressed, cSize, 0); |
| 51 | cSize = ZSTD_compress_usingDict(cctx, |
| 52 | compressed, compressedCapacity, |
| 53 | src, srcSize, |
| 54 | dict.buff, dict.size, |
| 55 | cLevel); |
| 56 | FUZZ_ASSERT(cSize == cSize0); |
| 57 | FUZZ_ASSERT(XXH64(compressed, cSize, 0) == hash0); |
| 58 | } |
| 59 | } else { |
| 60 | size_t remainingBytes; |
| 61 | dictContentType = FUZZ_dataProducer_uint32Range(producer, 0, 2); |
| 62 | remainingBytes = FUZZ_dataProducer_remainingBytes(producer); |
| 63 | FUZZ_setRandomParameters(cctx, srcSize, producer); |
| 64 | /* Disable checksum so we can use sizes smaller than compress bound. */ |
| 65 | FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0)); |
| 66 | if (refPrefix) |
| 67 | FUZZ_ZASSERT(ZSTD_CCtx_refPrefix_advanced( |
| 68 | cctx, dict.buff, dict.size, |
| 69 | dictContentType)); |
| 70 | else |
| 71 | FUZZ_ZASSERT(ZSTD_CCtx_loadDictionary_advanced( |
| 72 | cctx, dict.buff, dict.size, |
| 73 | (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1), |
| 74 | dictContentType)); |
| 75 | cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize); |
| 76 | FUZZ_ZASSERT(cSize); |
| 77 | // Compress a second time and check for determinism |
| 78 | { |
| 79 | size_t const cSize0 = cSize; |
| 80 | XXH64_hash_t const hash0 = XXH64(compressed, cSize, 0); |
| 81 | FUZZ_dataProducer_rollBack(producer, remainingBytes); |
| 82 | FUZZ_setRandomParameters(cctx, srcSize, producer); |
| 83 | FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0)); |
| 84 | if (refPrefix) |
| 85 | FUZZ_ZASSERT(ZSTD_CCtx_refPrefix_advanced( |
| 86 | cctx, dict.buff, dict.size, |
| 87 | dictContentType)); |
| 88 | cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize); |
| 89 | FUZZ_ASSERT(cSize == cSize0); |
| 90 | FUZZ_ASSERT(XXH64(compressed, cSize, 0) == hash0); |
| 91 | } |
| 92 | } |
| 93 | if (refPrefix) |
| 94 | FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced( |
| 95 | dctx, dict.buff, dict.size, |
| 96 | dictContentType)); |
| 97 | else |
| 98 | FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced( |
| 99 | dctx, dict.buff, dict.size, |
| 100 | (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1), |
| 101 | dictContentType)); |
| 102 | { |
| 103 | size_t const ret = ZSTD_decompressDCtx( |
| 104 | dctx, result, resultCapacity, compressed, cSize); |
| 105 | free(dict.buff); |
| 106 | return ret; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
| 111 | { |
| 112 | FUZZ_SEQ_PROD_SETUP(); |
| 113 | |
| 114 | /* Give a random portion of src data to the producer, to use for |
| 115 | parameter generation. The rest will be used for (de)compression */ |
| 116 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
| 117 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
| 118 | |
| 119 | size_t const rBufSize = size; |
| 120 | void* rBuf = FUZZ_malloc(rBufSize); |
| 121 | size_t cBufSize = ZSTD_compressBound(size); |
| 122 | void *cBuf; |
| 123 | /* Half of the time fuzz with a 1 byte smaller output size. |
| 124 | * This will still succeed because we force the checksum to be disabled, |
| 125 | * giving us 4 bytes of overhead. |
| 126 | */ |
| 127 | cBufSize -= FUZZ_dataProducer_uint32Range(producer, 0, 1); |
| 128 | cBuf = FUZZ_malloc(cBufSize); |
| 129 | |
| 130 | if (!cctx) { |
| 131 | cctx = ZSTD_createCCtx(); |
| 132 | FUZZ_ASSERT(cctx); |
| 133 | } |
| 134 | if (!dctx) { |
| 135 | dctx = ZSTD_createDCtx(); |
| 136 | FUZZ_ASSERT(dctx); |
| 137 | } |
| 138 | |
| 139 | { |
| 140 | size_t const result = |
| 141 | roundTripTest(rBuf, rBufSize, cBuf, cBufSize, src, size, producer); |
| 142 | FUZZ_ZASSERT(result); |
| 143 | FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size"); |
| 144 | FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!"); |
| 145 | } |
| 146 | free(rBuf); |
| 147 | free(cBuf); |
| 148 | FUZZ_dataProducer_free(producer); |
| 149 | #ifndef STATEFUL_FUZZING |
| 150 | ZSTD_freeCCtx(cctx); cctx = NULL; |
| 151 | ZSTD_freeDCtx(dctx); dctx = NULL; |
| 152 | #endif |
| 153 | FUZZ_SEQ_PROD_TEARDOWN(); |
| 154 | return 0; |
| 155 | } |