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
LLVMFuzzerTestOneInput(const uint8_t * src,size_t size)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 }
78