fuzz_tree.py

# 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.
#
###############################################################################
# Note: This file has been modified by contributors to GitPython.
# The original state of this file may be referenced here:
# https://github.com/google/oss-fuzz/commit/f26f254558fc48f3c9bc130b10507386b94522da
###############################################################################
import atheris
import io
import sys
import os
import shutil

if getattr(sys, "frozen", False) and hasattr(sys, "_MEIPASS"):
    path_to_bundled_git_binary = os.path.abspath(os.path.join(os.path.dirname(__file__), "git"))
    os.environ["GIT_PYTHON_GIT_EXECUTABLE"] = path_to_bundled_git_binary

with atheris.instrument_imports():
    import git


def TestOneInput(data):
    fdp = atheris.FuzzedDataProvider(data)
    git_dir = "/tmp/.git"
    head_file = os.path.join(git_dir, "HEAD")
    refs_dir = os.path.join(git_dir, "refs")
    common_dir = os.path.join(git_dir, "commondir")
    objects_dir = os.path.join(git_dir, "objects")

    if os.path.isdir(git_dir):
        shutil.rmtree(git_dir)

    os.mkdir(git_dir)
    with open(head_file, "w") as f:
        f.write(fdp.ConsumeUnicodeNoSurrogates(1024))
    os.mkdir(refs_dir)
    os.mkdir(common_dir)
    os.mkdir(objects_dir)

    _repo = git.Repo("/tmp/")

    fuzz_tree = git.Tree(_repo, git.Tree.NULL_BIN_SHA, 0, "")
    try:
        fuzz_tree._deserialize(io.BytesIO(data))
    except IndexError:
        return -1


def main():
    atheris.Setup(sys.argv, TestOneInput)
    atheris.Fuzz()


if __name__ == "__main__":
    main()