From ab91a0341a76e072db3213f3565601d6d9c5e5ba Mon Sep 17 00:00:00 2001 From: DavidKorczynski Date: Sat, 11 Feb 2023 16:58:47 +0000 Subject: [PATCH] pyyaml: add emitter fuzzer (#9689) Signed-off-by: David Korczynski Signed-off-by: David Korczynski --- projects/pyyaml/fuzz_emitter.py | 45 +++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 projects/pyyaml/fuzz_emitter.py diff --git a/projects/pyyaml/fuzz_emitter.py b/projects/pyyaml/fuzz_emitter.py new file mode 100644 index 000000000..ac6442349 --- /dev/null +++ b/projects/pyyaml/fuzz_emitter.py @@ -0,0 +1,45 @@ +#!/usr/bin/python3 +# Copyright 2023 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. +"""Targets primarily code in lib/yaml/emitter.py. """ +import sys +import atheris + +import io +import yaml + +def TestOneInput(data): + try: + events = list(yaml.parse(io.BytesIO(data))) + except yaml.YAMLError: + return + except RecursionError: + return + try: + output = yaml.emit(events) + except yaml.emitter.EmitterError: + return + except RecursionError: + return + + # At this point the output should be good to parse cleanly. + yaml.parse(output) + +def main(): + atheris.instrument_all() + atheris.Setup(sys.argv, TestOneInput) + atheris.Fuzz() + +if __name__ == "__main__": + main()