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Add block fuzzers

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This commit is contained in:
Nick Terrell 2017-09-13 17:44:41 -07:00
parent def3214d74
commit b7e1522330
3 changed files with 159 additions and 1 deletions
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10
tests/fuzz/Makefile
View File

@ -50,8 +50,10 @@ default: all
all: \
simple_round_trip \
stream_round_trip \
block_round_trip \
simple_decompress \
stream_decompress
stream_decompress \
block_decompress
%.o: %.c
$(CC) $(FUZZ_CPPFLAGS) $(FUZZ_CFLAGS) $^ -c -o $@
@ -62,12 +64,18 @@ simple_round_trip: $(FUZZ_HEADERS) $(ZSTD_OBJ) simple_round_trip.o
stream_round_trip: $(FUZZ_HEADERS) $(ZSTD_OBJ) stream_round_trip.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(ZSTD_OBJ) stream_round_trip.o $(LIB_FUZZING_ENGINE) -o $@
block_round_trip: $(FUZZ_HEADERS) $(ZSTD_OBJ) block_round_trip.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(ZSTD_OBJ) block_round_trip.o $(LIB_FUZZING_ENGINE) -o $@
simple_decompress: $(FUZZ_HEADERS) $(ZSTD_OBJ) simple_decompress.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(ZSTD_OBJ) simple_decompress.o $(LIB_FUZZING_ENGINE) -o $@
stream_decompress: $(FUZZ_HEADERS) $(ZSTD_OBJ) stream_decompress.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(ZSTD_OBJ) stream_decompress.o $(LIB_FUZZING_ENGINE) -o $@
block_decompress: $(FUZZ_HEADERS) $(ZSTD_OBJ) block_decompress.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(ZSTD_OBJ) block_decompress.o $(LIB_FUZZING_ENGINE) -o $@
libregression.a: $(FUZZ_HEADERS) $(PRGDIR)/util.h regression_driver.o
$(AR) $(FUZZ_ARFLAGS) $@ regression_driver.o

51
tests/fuzz/block_decompress.c Normal file
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@ -0,0 +1,51 @@
/**
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
* 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).
*/
/**
* This fuzz target attempts to decompress the fuzzed data with the simple
* decompression function to ensure the decompressor never crashes.
*/
#define ZSTD_STATIC_LINKING_ONLY
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "fuzz_helpers.h"
#include "zstd.h"
static ZSTD_DCtx *dctx = NULL;
static void* rBuf = NULL;
static size_t bufSize = 0;
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
size_t const neededBufSize = ZSTD_BLOCKSIZE_MAX;
FUZZ_seed(&src, &size);
/* Allocate all buffers and contexts if not already allocated */
if (neededBufSize > bufSize) {
free(rBuf);
rBuf = malloc(neededBufSize);
bufSize = neededBufSize;
FUZZ_ASSERT(rBuf);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
ZSTD_decompressBegin(dctx);
ZSTD_decompressBlock(dctx, rBuf, neededBufSize, src, size);
#ifndef STATEFUL_FUZZING
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}

99
tests/fuzz/block_round_trip.c Normal file
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@ -0,0 +1,99 @@
/**
* Copyright (c) 2016-present, Facebook, Inc.
* 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).
*/
/**
* 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.h"
static const int kMaxClevel = 19;
static ZSTD_CCtx *cctx = NULL;
static ZSTD_DCtx *dctx = NULL;
static void* cBuf = NULL;
static void* rBuf = NULL;
static size_t bufSize = 0;
static uint32_t seed;
static size_t roundTripTest(void *result, size_t resultCapacity,
void *compressed, size_t compressedCapacity,
const void *src, size_t srcSize)
{
int const cLevel = FUZZ_rand(&seed) % kMaxClevel;
size_t ret = ZSTD_compressBegin(cctx, cLevel);
if (ZSTD_isError(ret)) {
fprintf(stderr, "ZSTD_compressBegin() error: %s\n",
ZSTD_getErrorName(ret));
return ret;
}
ret = ZSTD_compressBlock(cctx, compressed, compressedCapacity, src, srcSize);
if (ZSTD_isError(ret)) {
fprintf(stderr, "ZSTD_compressBlock() error: %s\n", ZSTD_getErrorName(ret));
return ret;
}
if (ret == 0) {
FUZZ_ASSERT(resultCapacity >= srcSize);
memcpy(result, src, srcSize);
return srcSize;
}
ZSTD_decompressBegin(dctx);
return ZSTD_decompressBlock(dctx, result, resultCapacity, compressed, ret);
}
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
size_t neededBufSize;
seed = FUZZ_seed(&src, &size);
neededBufSize = size;
if (size > ZSTD_BLOCKSIZE_MAX)
return 0;
/* Allocate all buffers and contexts if not already allocated */
if (neededBufSize > bufSize || !cBuf || !rBuf) {
free(cBuf);
free(rBuf);
cBuf = malloc(neededBufSize);
rBuf = malloc(neededBufSize);
bufSize = neededBufSize;
FUZZ_ASSERT(cBuf && rBuf);
}
if (!cctx) {
cctx = ZSTD_createCCtx();
FUZZ_ASSERT(cctx);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
{
size_t const result =
roundTripTest(rBuf, neededBufSize, cBuf, neededBufSize, src, size);
FUZZ_ASSERT_MSG(!ZSTD_isError(result), ZSTD_getErrorName(result));
FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size");
FUZZ_ASSERT_MSG(!memcmp(src, rBuf, size), "Corruption!");
}
#ifndef STATEFUL_FUZZING
ZSTD_freeCCtx(cctx); cctx = NULL;
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}