| 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 attempts to decompress the fuzzed data with the dictionary |
| 13 | * decompression function to ensure the decompressor never crashes. It does not |
| 14 | * fuzz the dictionary. |
| 15 | */ |
| 16 | |
| 17 | #include <stddef.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <stdio.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 | static ZSTD_DCtx *dctx = NULL; |
| 26 | |
| 27 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
| 28 | { |
| 29 | FUZZ_SEQ_PROD_SETUP(); |
| 30 | |
| 31 | /* Give a random portion of src data to the producer, to use for |
| 32 | parameter generation. The rest will be used for (de)compression */ |
| 33 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
| 34 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
| 35 | |
| 36 | FUZZ_dict_t dict; |
| 37 | ZSTD_DDict* ddict = NULL; |
| 38 | |
| 39 | if (!dctx) { |
| 40 | dctx = ZSTD_createDCtx(); |
| 41 | FUZZ_ASSERT(dctx); |
| 42 | } |
| 43 | dict = FUZZ_train(src, size, producer); |
| 44 | if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) { |
| 45 | ddict = ZSTD_createDDict(dict.buff, dict.size); |
| 46 | FUZZ_ASSERT(ddict); |
| 47 | } else { |
| 48 | if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) |
| 49 | FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced( |
| 50 | dctx, dict.buff, dict.size, |
| 51 | (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1), |
| 52 | (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2))); |
| 53 | else |
| 54 | FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced( |
| 55 | dctx, dict.buff, dict.size, |
| 56 | (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2))); |
| 57 | } |
| 58 | |
| 59 | { |
| 60 | size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, 10 * size); |
| 61 | void* rBuf = FUZZ_malloc(bufSize); |
| 62 | if (ddict) { |
| 63 | ZSTD_decompress_usingDDict(dctx, rBuf, bufSize, src, size, ddict); |
| 64 | } else { |
| 65 | ZSTD_decompressDCtx(dctx, rBuf, bufSize, src, size); |
| 66 | } |
| 67 | free(rBuf); |
| 68 | } |
| 69 | free(dict.buff); |
| 70 | FUZZ_dataProducer_free(producer); |
| 71 | ZSTD_freeDDict(ddict); |
| 72 | #ifndef STATEFUL_FUZZING |
| 73 | ZSTD_freeDCtx(dctx); dctx = NULL; |
| 74 | #endif |
| 75 | FUZZ_SEQ_PROD_TEARDOWN(); |
| 76 | return 0; |
| 77 | } |