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 #include <stddef.h>
17 #include <stdlib.h>
18 #include <stdio.h>
19 #include <string.h>
20 #include "common/cpu.h"
21 #include "common/huf.h"
22 #include "fuzz_helpers.h"
23 #include "fuzz_data_producer.h"
24
LLVMFuzzerTestOneInput(const uint8_t * src,size_t size)25 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
26 {
27 FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
28 /* Select random parameters: #streams, X1 or X2 decoding, bmi2 */
29 int const streams = FUZZ_dataProducer_int32Range(producer, 0, 1);
30 int const symbols = FUZZ_dataProducer_int32Range(producer, 0, 1);
31 int const flags = 0
32 | (ZSTD_cpuid_bmi2(ZSTD_cpuid()) && FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_bmi2 : 0)
33 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_optimalDepth : 0)
34 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_preferRepeat : 0)
35 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_suspectUncompressible : 0)
36 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_disableAsm : 0)
37 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_disableFast : 0);
38 /* Select a random cBufSize - it may be too small */
39 size_t const dBufSize = FUZZ_dataProducer_uint32Range(producer, 0, 8 * size + 500);
40 size_t const maxTableLog = FUZZ_dataProducer_uint32Range(producer, 1, HUF_TABLELOG_MAX);
41 HUF_DTable* dt = (HUF_DTable*)FUZZ_malloc(HUF_DTABLE_SIZE(maxTableLog) * sizeof(HUF_DTable));
42 size_t const wkspSize = HUF_WORKSPACE_SIZE;
43 void* wksp = FUZZ_malloc(wkspSize);
44 void* dBuf = FUZZ_malloc(dBufSize);
45 dt[0] = maxTableLog * 0x01000001;
46 size = FUZZ_dataProducer_remainingBytes(producer);
47
48 if (symbols == 0) {
49 size_t const err = HUF_readDTableX1_wksp(dt, src, size, wksp, wkspSize, flags);
50 if (ZSTD_isError(err))
51 goto _out;
52 } else {
53 size_t const err = HUF_readDTableX2_wksp(dt, src, size, wksp, wkspSize, flags);
54 if (ZSTD_isError(err))
55 goto _out;
56 }
57 if (streams == 0)
58 HUF_decompress1X_usingDTable(dBuf, dBufSize, src, size, dt, flags);
59 else
60 HUF_decompress4X_usingDTable(dBuf, dBufSize, src, size, dt, flags);
61
62 _out:
63 free(dt);
64 free(wksp);
65 free(dBuf);
66 FUZZ_dataProducer_free(producer);
67 return 0;
68 }
69