mirror of https://github.com/google/oss-fuzz.git
130 lines
3.9 KiB
Python
130 lines
3.9 KiB
Python
# Copyright 2020 Google LLC
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
"""Utilities for OSS-Fuzz infrastructure."""
|
|
|
|
import logging
|
|
import os
|
|
import re
|
|
import stat
|
|
import subprocess
|
|
|
|
import helper
|
|
|
|
ALLOWED_FUZZ_TARGET_EXTENSIONS = ['', '.exe']
|
|
FUZZ_TARGET_SEARCH_STRING = 'LLVMFuzzerTestOneInput'
|
|
VALID_TARGET_NAME = re.compile(r'^[a-zA-Z0-9_-]+$')
|
|
|
|
|
|
def chdir_to_root():
|
|
"""Changes cwd to OSS-Fuzz root directory."""
|
|
# Change to oss-fuzz main directory so helper.py runs correctly.
|
|
if os.getcwd() != helper.OSSFUZZ_DIR:
|
|
os.chdir(helper.OSSFUZZ_DIR)
|
|
|
|
|
|
def execute(command, location=None, check_result=False):
|
|
""" Runs a shell command in the specified directory location.
|
|
|
|
Args:
|
|
command: The command as a list to be run.
|
|
location: The directory the command is run in.
|
|
check_result: Should an exception be thrown on failed command.
|
|
|
|
Returns:
|
|
stdout, stderr, error code.
|
|
|
|
Raises:
|
|
RuntimeError: running a command resulted in an error.
|
|
"""
|
|
|
|
if not location:
|
|
location = os.getcwd()
|
|
process = subprocess.Popen(command,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE,
|
|
cwd=location)
|
|
out, err = process.communicate()
|
|
out = out.decode('ascii')
|
|
err = err.decode('ascii')
|
|
if err:
|
|
logging.debug('Stderr of command \'%s\' is %s.', ' '.join(command), err)
|
|
if check_result and process.returncode:
|
|
raise RuntimeError(
|
|
'Executing command \'{0}\' failed with error: {1}.'.format(
|
|
' '.join(command), err))
|
|
return out, err, process.returncode
|
|
|
|
|
|
def get_fuzz_targets(path):
|
|
"""Get list of fuzz targets in a directory.
|
|
|
|
Args:
|
|
path: A path to search for fuzz targets in.
|
|
|
|
Returns:
|
|
A list of paths to fuzzers or an empty list if None.
|
|
"""
|
|
if not os.path.exists(path):
|
|
return []
|
|
fuzz_target_paths = []
|
|
for root, _, _ in os.walk(path):
|
|
for filename in os.listdir(path):
|
|
file_path = os.path.join(root, filename)
|
|
if is_fuzz_target_local(file_path):
|
|
fuzz_target_paths.append(file_path)
|
|
|
|
return fuzz_target_paths
|
|
|
|
|
|
def get_container_name():
|
|
"""Gets the name of the current docker container you are in.
|
|
/proc/self/cgroup can be used to check control groups e.g. Docker.
|
|
See: https://docs.docker.com/config/containers/runmetrics/ for more info.
|
|
|
|
Returns:
|
|
Container name or None if not in a container.
|
|
"""
|
|
with open('/proc/self/cgroup') as file_handle:
|
|
if 'docker' not in file_handle.read():
|
|
return None
|
|
with open('/etc/hostname') as file_handle:
|
|
return file_handle.read().strip()
|
|
|
|
|
|
def is_fuzz_target_local(file_path):
|
|
"""Returns whether |file_path| is a fuzz target binary (local path).
|
|
Copied from clusterfuzz src/python/bot/fuzzers/utils.py
|
|
with slight modifications.
|
|
"""
|
|
filename, file_extension = os.path.splitext(os.path.basename(file_path))
|
|
if not VALID_TARGET_NAME.match(filename):
|
|
# Check fuzz target has a valid name (without any special chars).
|
|
return False
|
|
|
|
if file_extension not in ALLOWED_FUZZ_TARGET_EXTENSIONS:
|
|
# Ignore files with disallowed extensions (to prevent opening e.g. .zips).
|
|
return False
|
|
|
|
if not os.path.exists(file_path) or not os.access(file_path, os.X_OK):
|
|
return False
|
|
|
|
if filename.endswith('_fuzzer'):
|
|
return True
|
|
|
|
if os.path.exists(file_path) and not stat.S_ISREG(os.stat(file_path).st_mode):
|
|
return False
|
|
|
|
with open(file_path, 'rb') as file_handle:
|
|
return file_handle.read().find(FUZZ_TARGET_SEARCH_STRING.encode()) != -1
|