#!/usr/bin/env python # Copyright 2014 The Chromium Authors. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. """Mutational ClusterFuzz fuzzer. A pre-built corpus of ipcdump files has to be uploaded to ClusterFuzz along with this script. As chrome is being developed, the corpus will become out-of-date and needs to be updated. This fuzzer will pick some ipcdumps from the corpus, concatenate them with ipc_message_util and mutate the result with ipc_fuzzer_mutate. """ import os import random import subprocess import sys import utils FUZZER_NAME_OPTION = '--fuzzer-name=mutate' IPC_MESSAGE_UTIL_APPLICATION = 'ipc_message_util' IPCDUMP_MERGE_LIMIT = 50 class MutationalFuzzer: def parse_arguments(self): self.args = utils.parse_arguments() def set_application_paths(self): chrome_application_path = utils.get_application_path() chrome_application_directory = os.path.dirname(chrome_application_path) self.ipc_message_util_binary = utils.application_name_for_platform( IPC_MESSAGE_UTIL_APPLICATION) self.ipc_fuzzer_binary = utils.get_fuzzer_application_name() self.ipc_replay_binary = utils.get_replay_application_name() self.ipc_message_util_binary_path = os.path.join( chrome_application_directory, self.ipc_message_util_binary) self.ipc_fuzzer_binary_path = os.path.join( chrome_application_directory, self.ipc_fuzzer_binary) self.ipc_replay_binary_path = os.path.join( chrome_application_directory, self.ipc_replay_binary) def set_corpus(self): input_directory = self.args.input_dir entries = os.listdir(input_directory) entries = [i for i in entries if i.endswith(utils.IPCDUMP_EXTENSION)] self.corpus = [os.path.join(input_directory, entry) for entry in entries] def create_mutated_ipcdump_testcase(self): ipcdumps = ','.join(random.sample(self.corpus, IPCDUMP_MERGE_LIMIT)) tmp_ipcdump_testcase = utils.create_temp_file() mutated_ipcdump_testcase = ( utils.random_ipcdump_testcase_path(self.args.output_dir)) # Concatenate ipcdumps -> tmp_ipcdump. cmd = [ self.ipc_message_util_binary_path, ipcdumps, tmp_ipcdump_testcase, ] if subprocess.call(cmd): sys.exit('%s failed.' % self.ipc_message_util_binary) # Mutate tmp_ipcdump -> mutated_ipcdump. cmd = [ self.ipc_fuzzer_binary_path, FUZZER_NAME_OPTION, tmp_ipcdump_testcase, mutated_ipcdump_testcase, ] if subprocess.call(cmd): sys.exit('%s failed.' % self.ipc_fuzzer_binary) utils.create_flags_file( mutated_ipcdump_testcase, self.ipc_replay_binary_path) os.remove(tmp_ipcdump_testcase) def main(self): self.parse_arguments() self.set_application_paths() self.set_corpus() for _ in xrange(self.args.no_of_files): self.create_mutated_ipcdump_testcase() return 0 if __name__ == "__main__": fuzzer = MutationalFuzzer() sys.exit(fuzzer.main())