oss-fuzz/projects/pasta/fuzz_parse.py

#!/usr/bin/python3
# Copyright 2022 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.
import sys
import atheris

import pasta

# For detecting security-sensitive issues
import pysecsan
pysecsan.sanlib.sanitizer_log_level = 30
pysecsan.add_hooks()


@atheris.instrument_func
def TestOneInput(data):
  fdp = atheris.FuzzedDataProvider(data)
  try:
    pasta.parse(fdp.ConsumeUnicodeNoSurrogates(8096))
  except (
    SyntaxError, # thrown by ast fast
    ValueError,  # thrown by ast fast
    pasta.base.annotate.AnnotationError, # pasta-thrown error
    MemoryError, # For stack overflows
    RecursionError # Not interesting
  ):
    pass


def main():
  atheris.instrument_all()
  atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
  atheris.Fuzz()


if __name__ == "__main__":
  main()