| 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 | } |