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- # 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- developed, the corpus will become out-of-date and needs to be updated.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 __init__(self):
- self.args = utils.parse_arguments()
- 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_message_util_binary_path = utils.get_application_path(
- self.ipc_message_util_binary)
- self.ipc_fuzzer_binary_path = utils.get_application_path(
- self.ipc_fuzzer_binary)
- def set_corpus(self):
- # Corpus should be set per job as a fuzzer-specific environment variable.
- corpus = os.getenv('IPC_CORPUS_DIR', 'default')
- corpus_directory = os.path.join(self.args.input_dir, corpus)
- if not os.path.exists(corpus_directory):
- sys.exit('Corpus directory "%s" not found.' % corpus_directory)
- entries = os.listdir(corpus_directory)
- entries = [i for i in entries if i.endswith(utils.IPCDUMP_EXTENSION)]
- self.corpus = [os.path.join(corpus_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)
- os.remove(tmp_ipcdump_testcase)
- def main(self):
- self.set_corpus()
- for _ in range(self.args.no_of_files):
- self.create_mutated_ipcdump_testcase()
- return 0
- if __name__ == '__main__':
- fuzzer = MutationalFuzzer()
- sys.exit(fuzzer.main())
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