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https://github.com/Cisco-Talos/clamav.git
synced 2025-10-19 18:33:16 +00:00
0037f5825b
I found two issues with the cl_load fuzz targets, one of which impacts the scanfile and scanmap fuzz targets: 1. We were defining the preprocessor definitions incorrectly using "SCAN_TARGETS" instead of "TARGET" in unit_tests/CMakeLists.txt. For the scan fuzz targets this meant it wasn't properly defining unique settings for each compiled target. For the cl_load fuzz target it's worse, it wasn't setting the database file name correctly which means it rejected the filenames entirely for not having a legitimate suffix. 2. We were pre-compiling the engine before loading signatures. You can't load sigs for an engine that's already compiled, so this would also fail right away without trying to load any sigs.
151 lines
4.8 KiB
C++
151 lines
4.8 KiB
C++
/*
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* Fuzz target for cl_load()
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*
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* Copyright (C) 2018-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Authors: Micah Snyder
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "clamav.h"
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void clamav_message_callback(enum cl_msg severity, const char* fullmsg,
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const char* msg, void* context)
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{
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}
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class ClamAVState
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{
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public:
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ClamAVState()
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{
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// Silence all the log messages, none of them are meaningful.
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cl_set_clcb_msg(clamav_message_callback);
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cl_init(CL_INIT_DEFAULT);
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dboptions =
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CL_DB_PHISHING | CL_DB_PHISHING_URLS |
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CL_DB_BYTECODE | CL_DB_PUA | CL_DB_ENHANCED;
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#if defined(CLAMAV_FUZZ_CDB)
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tmp_db_name = "dbload_tmp_fuzz.cdb";
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#elif defined(CLAMAV_FUZZ_CFG)
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tmp_db_name = "dbload_tmp_fuzz.cfg";
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#elif defined(CLAMAV_FUZZ_CRB)
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tmp_db_name = "dbload_tmp_fuzz.crb";
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#elif defined(CLAMAV_FUZZ_FP)
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tmp_db_name = "dbload_tmp_fuzz.fp";
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#elif defined(CLAMAV_FUZZ_FTM)
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tmp_db_name = "dbload_tmp_fuzz.ftm";
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#elif defined(CLAMAV_FUZZ_HDB)
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tmp_db_name = "dbload_tmp_fuzz.hdb";
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#elif defined(CLAMAV_FUZZ_HSB)
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tmp_db_name = "dbload_tmp_fuzz.hsb";
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#elif defined(CLAMAV_FUZZ_IDB)
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tmp_db_name = "dbload_tmp_fuzz.idb";
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#elif defined(CLAMAV_FUZZ_IGN)
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tmp_db_name = "dbload_tmp_fuzz.ign";
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#elif defined(CLAMAV_FUZZ_IGN2)
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tmp_db_name = "dbload_tmp_fuzz.ign2";
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#elif defined(CLAMAV_FUZZ_LDB)
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tmp_db_name = "dbload_tmp_fuzz.ldb";
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#elif defined(CLAMAV_FUZZ_MDB)
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tmp_db_name = "dbload_tmp_fuzz.mdb";
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#elif defined(CLAMAV_FUZZ_MSB)
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tmp_db_name = "dbload_tmp_fuzz.msb";
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#elif defined(CLAMAV_FUZZ_NDB)
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tmp_db_name = "dbload_tmp_fuzz.ndb";
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#elif defined(CLAMAV_FUZZ_PDB)
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tmp_db_name = "dbload_tmp_fuzz.pdb";
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#elif defined(CLAMAV_FUZZ_WDB)
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tmp_db_name = "dbload_tmp_fuzz.wdb";
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#elif defined(CLAMAV_FUZZ_YARA)
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tmp_db_name = "dbload_tmp_fuzz.yara";
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#else
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tmp_db_name = "dbload_tmp_fuzz";
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#endif
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}
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~ClamAVState()
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{
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if (NULL != tmp_db_name) {
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unlink(tmp_db_name);
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}
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}
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const char* tmp_db_name;
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unsigned int dboptions;
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};
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// Global with static initializer to setup an engine so we don't need to do
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// that on each execution.
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ClamAVState kClamAVState;
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
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{
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cl_error_t ret;
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unsigned int sigs = 0;
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FILE* fuzzdb = NULL;
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struct cl_engine* engine = NULL;
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fuzzdb = fopen(kClamAVState.tmp_db_name, "w");
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fwrite(data, size, 1, fuzzdb);
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fclose(fuzzdb);
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/* need new engine each time. can't add sigs to compiled engine */
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engine = cl_engine_new();
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/* load the fuzzer-generated sig db */
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if (CL_SUCCESS != (ret = cl_load(
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kClamAVState.tmp_db_name,
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engine,
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&sigs,
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kClamAVState.dboptions))) {
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printf("cl_load: %s\n", cl_strerror(ret));
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goto done;
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}
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/* build engine */
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if (CL_SUCCESS != (ret = cl_engine_compile(engine))) {
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printf("cl_engine_compile: %s\n", cl_strerror(ret));
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goto done;
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}
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done:
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/* Clean up for the next round */
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if (NULL != engine) {
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cl_engine_free(engine);
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}
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return 0;
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}
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