mirror of https://github.com/google/oss-fuzz.git
139 lines
4.7 KiB
Python
Executable File
139 lines
4.7 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2016 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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from __future__ import print_function
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import logging
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import os
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import re
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import sys
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import zipfile
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logging.basicConfig(level=logging.INFO, format='INFO: %(message)s')
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CODEC_NAME_REGEXP = re.compile(r'codec_id_(.+?)_fuzzer')
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def get_fuzzer_tags(fuzzer_name):
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"""Extract tags (are used to filter samples) from the given fuzzer name."""
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tags = []
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fuzzer_name = fuzzer_name.lower()
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# All subtitle samples are in 'sub' directory, need to add 'sub' tag manually.
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if 'subtitle' in fuzzer_name:
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tags.append('sub')
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m = CODEC_NAME_REGEXP.search(fuzzer_name)
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if m:
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codec_name = m.group(1)
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# Some names are complex, need to split them and filter common strings.
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codec_name_parts = codec_name.split('_')
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for codec in codec_name_parts:
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# Remove common strings from codec names like 'mpeg1video' or 'msvideo1'.
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codec = codec.split('video')[0]
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codec = codec.split('audio')[0]
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codec = codec.split('subtitle')[0]
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codec = codec.split('text')[0]
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if codec:
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# Some codec names have trailing characters: 'VP6F','FLV1', 'JPEGLS'.
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# Use only first 3 characters for long enough codec names.
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if len(codec) > 3:
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tags.append(codec[:3])
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else:
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tags.append(codec)
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return tags
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def parse_corpus(corpus_directory):
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"""Recursively list all files in the given directory and ignore checksums."""
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all_corpus_files = []
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for root, dirs, files in os.walk(corpus_directory):
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for filename in files:
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# Skip checksum files, they are useless in corpus.
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if 'md5sum' in filename:
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continue
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path = os.path.join(root, filename)
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all_corpus_files.append(path)
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logging.info('Parsed %d corpus files from %s' % (len(all_corpus_files),
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corpus_directory))
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return all_corpus_files
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def parse_fuzzers(fuzzers_directory):
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"""Recursively list all fuzzers in the given directory."""
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all_fuzzers = []
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for filename in os.listdir(fuzzers_directory):
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# Skip non-ffmpeg and non-fuzzer files in the given directory,
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if not filename.startswith('ffmpeg_') or not filename.endswith('_fuzzer'):
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continue
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fuzzer_path = os.path.join(fuzzers_directory, filename)
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all_fuzzers.append(fuzzer_path)
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logging.info('Parsed %d fuzzers from %s' % (len(all_fuzzers),
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fuzzers_directory))
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return all_fuzzers
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def zip_relevant_corpus(corpus_files, fuzzers):
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"""Find relevant corpus files and archive them for every fuzzer given."""
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for fuzzer in fuzzers:
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fuzzer_name = os.path.basename(fuzzer)
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fuzzer_directory = os.path.dirname(fuzzer)
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fuzzer_tags = get_fuzzer_tags(fuzzer_name)
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relevant_corpus_files = set()
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for filename in corpus_files:
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# Remove 'ffmpeg' substring to do not use everything for 'MPEG' codec.
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sanitized_filename = filename.replace('ffmpeg', '').lower()
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for tag in fuzzer_tags:
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if tag in sanitized_filename:
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relevant_corpus_files.add(filename)
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if not relevant_corpus_files:
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# Strip last symbol from tags if we haven't found relevant corpus.
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# It helps for such codecs as 'RV40' ('RV4' -> 'RV') or 'PCX' (-> 'PC').
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for tag in fuzzer_tags:
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if tag[:-1] in sanitized_filename:
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relevant_corpus_files.add(filename)
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logging.info(
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'Found %d relevant samples for %s' % (len(relevant_corpus_files),
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fuzzer_name))
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if not relevant_corpus_files:
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continue
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zip_archive_name = fuzzer + "_seed_corpus.zip"
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with zipfile.ZipFile(zip_archive_name, 'w') as archive:
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for filename in relevant_corpus_files:
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archive.write(filename)
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def main():
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if len(sys.argv) < 3:
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print('Usage: %s <seed_corpus_directory> <fuzzers_directory>' % __file__)
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sys.exit(1)
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seed_corpus_directory = sys.argv[1]
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fuzzers_directory = sys.argv[2]
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corpus_files = parse_corpus(seed_corpus_directory)
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fuzzers = parse_fuzzers(fuzzers_directory)
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zip_relevant_corpus(corpus_files, fuzzers)
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if __name__ == '__main__':
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sys.exit(main())
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