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Replace the Suboptimalfuzz_tree.py Harness With a Better Alternative#1910

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4 changes: 2 additions & 2 deletionsREADME.md
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Expand Up@@ -240,8 +240,8 @@ Please have a look at the [contributions file][contributing].

[3-Clause BSD License](https://opensource.org/license/bsd-3-clause/), also known as the New BSD License. See the [LICENSE file][license].

Two files exclusively used for fuzz testingare subject to [a separate license, detailed here](./fuzzing/README.md#license).
These files are not included in the wheel or sdist packages published by the maintainers of GitPython.
One file exclusively used for fuzz testingis subject to [a separate license, detailed here](./fuzzing/README.md#license).
This file is not included in the wheel or sdist packages published by the maintainers of GitPython.

[contributing]: https://github.com/gitpython-developers/GitPython/blob/main/CONTRIBUTING.md
[license]: https://github.com/gitpython-developers/GitPython/blob/main/LICENSE
16 changes: 8 additions & 8 deletionsfuzzing/README.md
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Expand Up@@ -225,14 +225,14 @@ to [the official OSS-Fuzz documentation][oss-fuzz-docs].
## LICENSE

All files located within the `fuzzing/` directory are subject to [the same license](../LICENSE)
as [the other files in this repository](../README.md#license) withtwo exceptions:

Two files located in this directory,[`fuzz_config.py`](./fuzz-targets/fuzz_config.py)
and [`fuzz_tree.py`](./fuzz-targets/fuzz_tree.py), have been migrated here from the OSS-Fuzz project repository where
they were originally created. As such, these two files retain their original license and copyright notice (Apache
License, Version 2.0 and Copyright 2023 Google LLC respectively.) Each file includes a notice in their respective header
comments stating that they have been modified.[LICENSE-APACHE](./LICENSE-APACHE) contains the original license used by
the OSS-Fuzz project repository at the time they were migrated.
as [the other files in this repository](../README.md#license) withone exception:

[`fuzz_config.py`](./fuzz-targets/fuzz_config.py) was migrated to this repository from the OSS-Fuzz project's repository
where it was originally created. As such, [`fuzz_config.py`](./fuzz-targets/fuzz_config.py) retains its original license
and copyright notice (Apache License, Version 2.0 and Copyright 2023 Google LLC respectively) as in a header
comment, followed by a notice stating that it has have been modified contributors to GitPython.
[LICENSE-APACHE](./LICENSE-APACHE) contains the original license used by the OSS-Fuzz project repository at the time the
file was migrated.

[oss-fuzz-repo]: https://github.com/google/oss-fuzz

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13 changes: 0 additions & 13 deletionsfuzzing/dictionaries/fuzz_tree.dict
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47 changes: 47 additions & 0 deletionsfuzzing/fuzz-targets/fuzz_repo.py
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@@ -0,0 +1,47 @@
import atheris
import io
import sys
import os
import tempfile

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)

with tempfile.TemporaryDirectory() as temp_dir:
repo = git.Repo.init(path=temp_dir)

# Generate a minimal set of files based on fuzz data to minimize I/O operations.
file_paths = [os.path.join(temp_dir, f"File{i}") for i in range(min(3, fdp.ConsumeIntInRange(1, 3)))]
for file_path in file_paths:
with open(file_path, "wb") as f:
# The chosen upperbound for count of bytes we consume by writing to these
# files is somewhat arbitrary and may be worth experimenting with if the
# fuzzer coverage plateaus.
f.write(fdp.ConsumeBytes(fdp.ConsumeIntInRange(1, 512)))

repo.index.add(file_paths)
repo.index.commit(fdp.ConsumeUnicodeNoSurrogates(fdp.ConsumeIntInRange(1, 80)))

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()
67 changes: 0 additions & 67 deletionsfuzzing/fuzz-targets/fuzz_tree.py
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