1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
#!/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developed, the corpus will become out-of-date and needs to be updated.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())
|
