c5d70b7dbb
Zstd compression sometimes does different stuff when it has at least `ZSTD_compressBound()` output bytes, or not. Half of the time fuzz with `ZSTD_compressBound() - 1` output bytes. Ensure that we have at least one byte of overhead by disabling either the dictionary ID or checksum.
88 lines
2.5 KiB
C
88 lines
2.5 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),
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* compares the result with the original, and calls abort() on corruption.
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*/
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#define ZSTD_STATIC_LINKING_ONLY
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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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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 uint32_t seed;
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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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{
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size_t cSize;
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if (FUZZ_rand(&seed) & 1) {
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FUZZ_setRandomParameters(cctx, srcSize, &seed);
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cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
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} else {
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int const cLevel = FUZZ_rand(&seed) % kMaxClevel;
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cSize = ZSTD_compressCCtx(
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cctx, compressed, compressedCapacity, src, srcSize, cLevel);
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}
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FUZZ_ZASSERT(cSize);
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return ZSTD_decompressDCtx(dctx, result, resultCapacity, compressed, cSize);
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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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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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seed = FUZZ_seed(&src, &size);
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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 don't use a dictionary, so the dictID
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* field is empty, giving us 4 bytes of overhead.
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*/
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cBufSize -= FUZZ_rand32(&seed, 0, 1);
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cBuf = malloc(cBufSize);
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FUZZ_ASSERT(cBuf && rBuf);
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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);
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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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#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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