python-cloud-storage: initial integration (#7999)

projects/gcp-python-cloud-storage/Dockerfile

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+# 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.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder-python
+RUN pip3 install --upgrade pip && pip3 install mock
+RUN git clone https://github.com/googleapis/python-storage
+COPY build.sh fuzz_fileio.py $SRC/
+WORKDIR python-storage

projects/gcp-python-cloud-storage/build.sh

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+#!/bin/bash -eu
+# 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.
+#
+################################################################################
+
+pip3 install .
+
+for fuzzer in $(find $SRC -name 'fuzz_*.py'); do
+  compile_python_fuzzer $fuzzer
+done

projects/gcp-python-cloud-storage/fuzz_fileio.py

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+#!/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 atheris
+import sys
+import mock
+
+with atheris.instrument_imports():
+    from google.cloud.storage.fileio import BlobReader
+
+
+global_data = None
+def TestOneInput(data):
+    global_data = data
+    fdp = atheris.FuzzedDataProvider(data)
+
+    blob = mock.Mock()
+    def read_fuzz_data(start=0, end=None, **_):
+        return global_data[start:end]
+
+    blob.download_as_bytes = mock.Mock(side_effect=read_fuzz_data)
+    blob.size = len(data)
+    blob.chunk_size = None
+    download_kwargs = {"if_metageneration_match": 1}
+    reader = BlobReader(blob, **download_kwargs)
+    try:
+        reader.read(fdp.ConsumeIntInRange(0, len(data)*2))
+    except UnicodeDecodeError:
+        return
+
+    reader.seek(
+        pos = fdp.ConsumeIntInRange(0, len(data)*2),
+        whence = fdp.ConsumeIntInRange(0, 2)
+    )
+
+
+def main():
+    atheris.instrument_all()
+    atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
+    atheris.Fuzz()
+
+if __name__ == "__main__":
+    main()

projects/gcp-python-cloud-storage/project.yaml

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+fuzzing_engines:
+- libfuzzer
+homepage: https://github.com/googleapis/python-storage
+language: python
+main_repo: https://github.com/googleapis/python-storage
+sanitizers:
+- address
+- undefined
+vendor_ccs:
+- david@adalogics.com
+- adam@adalogics.com
+- arthur.chan@adalogics.com