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 performs a zstd round-trip test (compress & decompress), |
13 | * compares the result with the original, and calls abort() on corruption. |
14 | */ |
15 | |
16 | #define ZSTD_STATIC_LINKING_ONLY |
17 | |
18 | #include <stddef.h> |
19 | #include <stdlib.h> |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | #include "fuzz_helpers.h" |
23 | #include "zstd.h" |
24 | #include "zstd_helpers.h" |
25 | #include "fuzz_data_producer.h" |
26 | #include "fuzz_third_party_seq_prod.h" |
27 | |
28 | static ZSTD_CCtx *cctx = NULL; |
29 | static ZSTD_DCtx *dctx = NULL; |
30 | static void* cBuf = NULL; |
31 | static void* rBuf = NULL; |
32 | static size_t bufSize = 0; |
33 | |
34 | static size_t roundTripTest(void *result, size_t resultCapacity, |
35 | void *compressed, size_t compressedCapacity, |
36 | const void *src, size_t srcSize, |
37 | int cLevel) |
38 | { |
39 | ZSTD_parameters const params = ZSTD_getParams(cLevel, srcSize, 0); |
40 | size_t ret = ZSTD_compressBegin_advanced(cctx, NULL, 0, params, srcSize); |
41 | FUZZ_ZASSERT(ret); |
42 | |
43 | ret = ZSTD_compressBlock(cctx, compressed, compressedCapacity, src, srcSize); |
44 | FUZZ_ZASSERT(ret); |
45 | if (ret == 0) { |
46 | FUZZ_ASSERT(resultCapacity >= srcSize); |
47 | if (srcSize > 0) { |
48 | memcpy(result, src, srcSize); |
49 | } |
50 | return srcSize; |
51 | } |
52 | ZSTD_decompressBegin(dctx); |
53 | return ZSTD_decompressBlock(dctx, result, resultCapacity, compressed, ret); |
54 | } |
55 | |
56 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
57 | { |
58 | FUZZ_SEQ_PROD_SETUP(); |
59 | |
60 | /* Give a random portion of src data to the producer, to use for |
61 | parameter generation. The rest will be used for (de)compression */ |
62 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
63 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
64 | |
65 | int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel); |
66 | |
67 | size_t neededBufSize = size; |
68 | if (size > ZSTD_BLOCKSIZE_MAX) |
69 | size = ZSTD_BLOCKSIZE_MAX; |
70 | |
71 | /* Allocate all buffers and contexts if not already allocated */ |
72 | if (neededBufSize > bufSize || !cBuf || !rBuf) { |
73 | free(cBuf); |
74 | free(rBuf); |
75 | cBuf = FUZZ_malloc(neededBufSize); |
76 | rBuf = FUZZ_malloc(neededBufSize); |
77 | bufSize = neededBufSize; |
78 | } |
79 | if (!cctx) { |
80 | cctx = ZSTD_createCCtx(); |
81 | FUZZ_ASSERT(cctx); |
82 | } |
83 | if (!dctx) { |
84 | dctx = ZSTD_createDCtx(); |
85 | FUZZ_ASSERT(dctx); |
86 | } |
87 | |
88 | { |
89 | size_t const result = |
90 | roundTripTest(rBuf, neededBufSize, cBuf, neededBufSize, src, size, |
91 | cLevel); |
92 | FUZZ_ZASSERT(result); |
93 | FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size"); |
94 | FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!"); |
95 | } |
96 | FUZZ_dataProducer_free(producer); |
97 | #ifndef STATEFUL_FUZZING |
98 | ZSTD_freeCCtx(cctx); cctx = NULL; |
99 | ZSTD_freeDCtx(dctx); dctx = NULL; |
100 | #endif |
101 | FUZZ_SEQ_PROD_TEARDOWN(); |
102 | return 0; |
103 | } |