Adds target for pyyaml project (#4944)

projects/pyyaml/fuzz_loader.py

@@ -0,0 +1,34 @@
+#!/usr/bin/python3
+
+# Copyright 2021 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 atheris
+
+import yaml
+
+
+def TestOneInput(input_bytes):
+  try:
+    context = yaml.load(input_bytes, Loader=yaml.FullLoader)
+  except yaml.YAMLError:
+    pass
+
+def main():
+  atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
+  atheris.Fuzz()
+
+
+if __name__ == "__main__":
+  main()