219 lines
7.6 KiB
C
219 lines
7.6 KiB
C
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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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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* You may select, at your option, one of the above-listed licenses.
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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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#include "fuzz_data_producer.h"
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#include "fuzz_third_party_seq_prod.h"
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ZSTD_CCtx *cctx = NULL;
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static ZSTD_DCtx *dctx = NULL;
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static uint8_t* cBuf = NULL;
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static uint8_t* rBuf = NULL;
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static size_t bufSize = 0;
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static ZSTD_outBuffer makeOutBuffer(uint8_t *dst, size_t capacity,
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FUZZ_dataProducer_t *producer)
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{
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ZSTD_outBuffer buffer = { dst, 0, 0 };
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FUZZ_ASSERT(capacity > 0);
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buffer.size = (FUZZ_dataProducer_uint32Range(producer, 1, capacity));
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FUZZ_ASSERT(buffer.size <= capacity);
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return buffer;
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}
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static ZSTD_inBuffer makeInBuffer(const uint8_t **src, size_t *size,
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FUZZ_dataProducer_t *producer)
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{
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ZSTD_inBuffer buffer = { *src, 0, 0 };
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FUZZ_ASSERT(*size > 0);
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buffer.size = (FUZZ_dataProducer_uint32Range(producer, 1, *size));
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FUZZ_ASSERT(buffer.size <= *size);
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*src += buffer.size;
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*size -= buffer.size;
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return buffer;
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}
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static size_t compress(uint8_t *dst, size_t capacity,
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const uint8_t *src, size_t srcSize,
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FUZZ_dataProducer_t *producer)
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{
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size_t dstSize = 0;
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ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
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FUZZ_setRandomParameters(cctx, srcSize, producer);
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int maxBlockSize;
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FUZZ_ZASSERT(ZSTD_CCtx_getParameter(cctx, ZSTD_c_maxBlockSize, &maxBlockSize));
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while (srcSize > 0) {
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ZSTD_inBuffer in = makeInBuffer(&src, &srcSize, producer);
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/* Mode controls the action. If mode == -1 we pick a new mode */
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int mode = -1;
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while (in.pos < in.size || mode != -1) {
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ZSTD_outBuffer out = makeOutBuffer(dst, capacity, producer);
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/* Previous action finished, pick a new mode. */
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if (mode == -1) mode = FUZZ_dataProducer_uint32Range(producer, 0, 9);
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switch (mode) {
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case 0: /* fall-through */
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case 1: /* fall-through */
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case 2: {
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size_t const ret =
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ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_flush);
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FUZZ_ZASSERT(ret);
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if (ret == 0)
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mode = -1;
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break;
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}
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case 3: {
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size_t ret =
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ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_end);
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FUZZ_ZASSERT(ret);
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/* Reset the compressor when the frame is finished */
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if (ret == 0) {
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ZSTD_CCtx_reset(cctx, ZSTD_reset_session_only);
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if (FUZZ_dataProducer_uint32Range(producer, 0, 7) == 0) {
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size_t const remaining = in.size - in.pos;
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FUZZ_setRandomParameters(cctx, remaining, producer);
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/* Always use the same maxBlockSize */
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FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_maxBlockSize, maxBlockSize));
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}
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mode = -1;
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}
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break;
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}
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case 4: {
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ZSTD_inBuffer nullIn = { NULL, 0, 0 };
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ZSTD_outBuffer nullOut = { NULL, 0, 0 };
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size_t const ret = ZSTD_compressStream2(cctx, &nullOut, &nullIn, ZSTD_e_continue);
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FUZZ_ZASSERT(ret);
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}
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/* fall-through */
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default: {
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size_t const ret =
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ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_continue);
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FUZZ_ZASSERT(ret);
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mode = -1;
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}
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}
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dst += out.pos;
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dstSize += out.pos;
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capacity -= out.pos;
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}
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}
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for (;;) {
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ZSTD_inBuffer in = {NULL, 0, 0};
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ZSTD_outBuffer out = makeOutBuffer(dst, capacity, producer);
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size_t const ret = ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_end);
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FUZZ_ZASSERT(ret);
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dst += out.pos;
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dstSize += out.pos;
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capacity -= out.pos;
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if (ret == 0)
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break;
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}
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return dstSize;
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}
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size_t decompress(void* dst, size_t dstCapacity, void const* src, size_t srcSize, FUZZ_dataProducer_t* producer)
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{
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ZSTD_inBuffer in = {src, srcSize, 0};
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ZSTD_outBuffer out = {dst, dstCapacity, 0};
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int maxBlockSize;
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FUZZ_ZASSERT(ZSTD_CCtx_getParameter(cctx, ZSTD_c_maxBlockSize, &maxBlockSize));
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if (FUZZ_dataProducer_uint32Range(producer, 0, 1)) {
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FUZZ_ZASSERT(ZSTD_DCtx_setParameter(dctx, ZSTD_d_maxBlockSize, maxBlockSize));
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}
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while (in.pos < in.size) {
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size_t const ret = ZSTD_decompressStream(dctx, &out, &in);
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FUZZ_ZASSERT(ret);
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FUZZ_ASSERT(ret == 0);
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}
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return out.pos;
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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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FUZZ_SEQ_PROD_SETUP();
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size_t neededBufSize;
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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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neededBufSize = ZSTD_compressBound(size) * 15;
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/* Allocate all buffers and contexts if not already allocated */
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if (neededBufSize > bufSize) {
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free(cBuf);
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free(rBuf);
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cBuf = (uint8_t*)FUZZ_malloc(neededBufSize);
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rBuf = (uint8_t*)FUZZ_malloc(neededBufSize);
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bufSize = neededBufSize;
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}
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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 cSize = compress(cBuf, neededBufSize, src, size, producer);
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size_t const rSize = decompress(rBuf, neededBufSize, cBuf, cSize, producer);
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FUZZ_ZASSERT(rSize);
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FUZZ_ASSERT_MSG(rSize == size, "Incorrect regenerated size");
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FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!");
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/* Test in-place decompression (note the macro doesn't work in this case) */
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{
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size_t const margin = ZSTD_decompressionMargin(cBuf, cSize);
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size_t const outputSize = size + margin;
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char* const output = (char*)FUZZ_malloc(outputSize);
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char* const input = output + outputSize - cSize;
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size_t dSize;
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FUZZ_ASSERT(outputSize >= cSize);
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memcpy(input, cBuf, cSize);
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dSize = ZSTD_decompressDCtx(dctx, output, outputSize, input, cSize);
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FUZZ_ZASSERT(dSize);
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FUZZ_ASSERT_MSG(dSize == size, "Incorrect regenerated size");
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FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, output, size), "Corruption!");
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free(output);
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}
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}
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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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FUZZ_SEQ_PROD_TEARDOWN();
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return 0;
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}
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