648db22b |
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 | } |