112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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*/
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/**
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* This fuzz target performs a zstd round-trip test (compress & decompress) with
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* a dictionary, compares the result with the original, and calls abort() on
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* corruption.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "fuzz_helpers.h"
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#include "zstd_helpers.h"
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#include "fuzz_data_producer.h"
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static const int kMaxClevel = 19;
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static ZSTD_CCtx *cctx = NULL;
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static ZSTD_DCtx *dctx = NULL;
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static size_t roundTripTest(void *result, size_t resultCapacity,
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void *compressed, size_t compressedCapacity,
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const void *src, size_t srcSize,
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FUZZ_dataProducer_t *producer)
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{
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ZSTD_dictContentType_e dictContentType = ZSTD_dct_auto;
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FUZZ_dict_t dict = FUZZ_train(src, srcSize, producer);
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size_t cSize;
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if ((FUZZ_dataProducer_uint32(producer) & 15) == 0) {
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int const cLevel = FUZZ_dataProducer_uint32(producer) % kMaxClevel;
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cSize = ZSTD_compress_usingDict(cctx,
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compressed, compressedCapacity,
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src, srcSize,
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dict.buff, dict.size,
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cLevel);
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} else {
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dictContentType = FUZZ_dataProducer_uint32Range(producer, 0, 2);
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FUZZ_setRandomParameters(cctx, srcSize, producer);
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/* Disable checksum so we can use sizes smaller than compress bound. */
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FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0));
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FUZZ_ZASSERT(ZSTD_CCtx_loadDictionary_advanced(
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cctx, dict.buff, dict.size,
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(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
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dictContentType));
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cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
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}
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FUZZ_ZASSERT(cSize);
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FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
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dctx, dict.buff, dict.size,
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(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
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dictContentType));
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{
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size_t const ret = ZSTD_decompressDCtx(
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dctx, result, resultCapacity, compressed, cSize);
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free(dict.buff);
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return ret;
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}
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}
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int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
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{
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/* Give a random portion of src data to the producer, to use for
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parameter generation. The rest will be used for (de)compression */
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FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
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size = FUZZ_dataProducer_reserveDataPrefix(producer);
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size_t const rBufSize = size;
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void* rBuf = malloc(rBufSize);
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size_t cBufSize = ZSTD_compressBound(size);
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void *cBuf;
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/* Half of the time fuzz with a 1 byte smaller output size.
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* This will still succeed because we force the checksum to be disabled,
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* giving us 4 bytes of overhead.
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*/
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cBufSize -= FUZZ_dataProducer_uint32Range(producer, 0, 1);
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cBuf = malloc(cBufSize);
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if (!cctx) {
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cctx = ZSTD_createCCtx();
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FUZZ_ASSERT(cctx);
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}
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if (!dctx) {
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dctx = ZSTD_createDCtx();
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FUZZ_ASSERT(dctx);
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}
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{
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size_t const result =
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roundTripTest(rBuf, rBufSize, cBuf, cBufSize, src, size, producer);
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FUZZ_ZASSERT(result);
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FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size");
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FUZZ_ASSERT_MSG(!memcmp(src, rBuf, size), "Corruption!");
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}
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free(rBuf);
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free(cBuf);
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FUZZ_dataProducer_free(producer);
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#ifndef STATEFUL_FUZZING
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ZSTD_freeCCtx(cctx); cctx = NULL;
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ZSTD_freeDCtx(dctx); dctx = NULL;
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#endif
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return 0;
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}
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