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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/**
* This fuzz target performs a zstd round-trip test (compress & decompress),
* compares the result with the original, and calls abort() on corruption.
*/
#define ZSTD_STATIC_LINKING_ONLY
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fuzz_helpers.h"
#include "zstd_helpers.h"
#include "fuzz_data_producer.h"
#include "fuzz_third_party_seq_prod.h"
ZSTD_CCtx *cctx = NULL;
static ZSTD_DCtx *dctx = NULL;
static uint8_t* cBuf = NULL;
static uint8_t* rBuf = NULL;
static size_t bufSize = 0;
static ZSTD_outBuffer makeOutBuffer(uint8_t *dst, size_t capacity,
FUZZ_dataProducer_t *producer)
{
ZSTD_outBuffer buffer = { dst, 0, 0 };
FUZZ_ASSERT(capacity > 0);
buffer.size = (FUZZ_dataProducer_uint32Range(producer, 1, capacity));
FUZZ_ASSERT(buffer.size <= capacity);
return buffer;
}
static ZSTD_inBuffer makeInBuffer(const uint8_t **src, size_t *size,
FUZZ_dataProducer_t *producer)
{
ZSTD_inBuffer buffer = { *src, 0, 0 };
FUZZ_ASSERT(*size > 0);
buffer.size = (FUZZ_dataProducer_uint32Range(producer, 1, *size));
FUZZ_ASSERT(buffer.size <= *size);
*src += buffer.size;
*size -= buffer.size;
return buffer;
}
static size_t compress(uint8_t *dst, size_t capacity,
const uint8_t *src, size_t srcSize,
FUZZ_dataProducer_t *producer)
{
size_t dstSize = 0;
ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
FUZZ_setRandomParameters(cctx, srcSize, producer);
while (srcSize > 0) {
ZSTD_inBuffer in = makeInBuffer(&src, &srcSize, producer);
/* Mode controls the action. If mode == -1 we pick a new mode */
int mode = -1;
while (in.pos < in.size || mode != -1) {
ZSTD_outBuffer out = makeOutBuffer(dst, capacity, producer);
/* Previous action finished, pick a new mode. */
if (mode == -1) mode = FUZZ_dataProducer_uint32Range(producer, 0, 9);
switch (mode) {
case 0: /* fall-through */
case 1: /* fall-through */
case 2: {
size_t const ret =
ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_flush);
FUZZ_ZASSERT(ret);
if (ret == 0)
mode = -1;
break;
}
case 3: {
size_t ret =
ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_end);
FUZZ_ZASSERT(ret);
/* Reset the compressor when the frame is finished */
if (ret == 0) {
ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
if (FUZZ_dataProducer_uint32Range(producer, 0, 7) == 0) {
size_t const remaining = in.size - in.pos;
FUZZ_setRandomParameters(cctx, remaining, producer);
}
mode = -1;
}
break;
}
case 4: {
ZSTD_inBuffer nullIn = { NULL, 0, 0 };
ZSTD_outBuffer nullOut = { NULL, 0, 0 };
size_t const ret = ZSTD_compressStream2(cctx, &nullOut, &nullIn, ZSTD_e_continue);
FUZZ_ZASSERT(ret);
}
/* fall-through */
default: {
size_t const ret =
ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_continue);
FUZZ_ZASSERT(ret);
mode = -1;
}
}
dst += out.pos;
dstSize += out.pos;
capacity -= out.pos;
}
}
for (;;) {
ZSTD_inBuffer in = {NULL, 0, 0};
ZSTD_outBuffer out = makeOutBuffer(dst, capacity, producer);
size_t const ret = ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_end);
FUZZ_ZASSERT(ret);
dst += out.pos;
dstSize += out.pos;
capacity -= out.pos;
if (ret == 0)
break;
}
return dstSize;
}
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
FUZZ_SEQ_PROD_SETUP();
size_t neededBufSize;
/* Give a random portion of src data to the producer, to use for
parameter generation. The rest will be used for (de)compression */
FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
size = FUZZ_dataProducer_reserveDataPrefix(producer);
neededBufSize = ZSTD_compressBound(size) * 15;
/* Allocate all buffers and contexts if not already allocated */
if (neededBufSize > bufSize) {
free(cBuf);
free(rBuf);
cBuf = (uint8_t*)FUZZ_malloc(neededBufSize);
rBuf = (uint8_t*)FUZZ_malloc(neededBufSize);
bufSize = neededBufSize;
}
if (!cctx) {
cctx = ZSTD_createCCtx();
FUZZ_ASSERT(cctx);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
{
size_t const cSize = compress(cBuf, neededBufSize, src, size, producer);
size_t const rSize =
ZSTD_decompressDCtx(dctx, rBuf, neededBufSize, cBuf, cSize);
FUZZ_ZASSERT(rSize);
FUZZ_ASSERT_MSG(rSize == size, "Incorrect regenerated size");
FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!");
/* Test in-place decompression (note the macro doesn't work in this case) */
{
size_t const margin = ZSTD_decompressionMargin(cBuf, cSize);
size_t const outputSize = size + margin;
char* const output = (char*)FUZZ_malloc(outputSize);
char* const input = output + outputSize - cSize;
size_t dSize;
FUZZ_ASSERT(outputSize >= cSize);
memcpy(input, cBuf, cSize);
dSize = ZSTD_decompressDCtx(dctx, output, outputSize, input, cSize);
FUZZ_ZASSERT(dSize);
FUZZ_ASSERT_MSG(dSize == size, "Incorrect regenerated size");
FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, output, size), "Corruption!");
free(output);
}
}
FUZZ_dataProducer_free(producer);
#ifndef STATEFUL_FUZZING
ZSTD_freeCCtx(cctx); cctx = NULL;
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
FUZZ_SEQ_PROD_TEARDOWN();
return 0;
}
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