1 /* 2 * Copyright (c) Meta Platforms, Inc. and affiliates. 3 * All rights reserved. 4 * 5 * This source code is licensed under both the BSD-style license (found in the 6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found 7 * in the COPYING file in the root directory of this source tree). 8 * You may select, at your option, one of the above-listed licenses. 9 */ 10 11 /** 12 * This fuzz target performs a zstd round-trip test (compress & decompress), 13 * compares the result with the original, and calls abort() on corruption. 14 */ 15 16 #include <stddef.h> 17 #include <stdlib.h> 18 #include <stdio.h> 19 #include <string.h> 20 #include "common/cpu.h" 21 #include "common/huf.h" 22 #include "fuzz_helpers.h" 23 #include "fuzz_data_producer.h" 24 25 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) 26 { 27 FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); 28 /* Select random parameters: #streams, X1 or X2 decoding, bmi2 */ 29 int const streams = FUZZ_dataProducer_int32Range(producer, 0, 1); 30 int const symbols = FUZZ_dataProducer_int32Range(producer, 0, 1); 31 int const flags = 0 32 | (ZSTD_cpuid_bmi2(ZSTD_cpuid()) && FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_bmi2 : 0) 33 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_optimalDepth : 0) 34 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_preferRepeat : 0) 35 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_suspectUncompressible : 0) 36 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_disableAsm : 0) 37 | (FUZZ_dataProducer_int32Range(producer, 0, 1) ? HUF_flags_disableFast : 0); 38 /* Select a random cBufSize - it may be too small */ 39 size_t const dBufSize = FUZZ_dataProducer_uint32Range(producer, 0, 8 * size + 500); 40 size_t const maxTableLog = FUZZ_dataProducer_uint32Range(producer, 1, HUF_TABLELOG_MAX); 41 HUF_DTable* dt = (HUF_DTable*)FUZZ_malloc(HUF_DTABLE_SIZE(maxTableLog) * sizeof(HUF_DTable)); 42 size_t const wkspSize = HUF_WORKSPACE_SIZE; 43 void* wksp = FUZZ_malloc(wkspSize); 44 void* dBuf = FUZZ_malloc(dBufSize); 45 dt[0] = maxTableLog * 0x01000001; 46 size = FUZZ_dataProducer_remainingBytes(producer); 47 48 if (symbols == 0) { 49 size_t const err = HUF_readDTableX1_wksp(dt, src, size, wksp, wkspSize, flags); 50 if (ZSTD_isError(err)) 51 goto _out; 52 } else { 53 size_t const err = HUF_readDTableX2_wksp(dt, src, size, wksp, wkspSize, flags); 54 if (ZSTD_isError(err)) 55 goto _out; 56 } 57 if (streams == 0) 58 HUF_decompress1X_usingDTable(dBuf, dBufSize, src, size, dt, flags); 59 else 60 HUF_decompress4X_usingDTable(dBuf, dBufSize, src, size, dt, flags); 61 62 _out: 63 free(dt); 64 free(wksp); 65 free(dBuf); 66 FUZZ_dataProducer_free(producer); 67 return 0; 68 } 69