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Fuzzer Migration Follow-ups #1903

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DaveLak
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@DaveLak DaveLak commented Apr 16, 2024

This PR addresses most unresolved review comments from #1901. It also updates the README

Addressed in This PR

  • Remove shebangs from fuzz harnesses (Comment 1 & Comment 2)
  • Replace shebang in build.sh with ShellCheck directive (Comment)
  • Set executable bit on fuzzing/oss-fuzz-scripts/container-environment-bootstrap.sh to mark it executable in Git (Comment)
  • Make the link text in fuzzing/README.md for the OSS-Fuzz test status URL more descriptive (Comment)
  • Fix capitalization of GitPython repository name in fuzzing/README.md (Comment)
  • Simplify read delimiter to use empty string in build.sh's build fuzz harness loop (Comment)
  • Remove unnecessary semicolons in fuzzing/oss-fuzz-scripts/container-environment-bootstrap.sh for consistent script formatting (Comment)
  • Fix various misspellings of "corpora" (Comment)

Misc

TODO / Pending Further Discussion

I felt that these items are better addressed in separate PRs.

DaveLak added 7 commits April 16, 2024 14:41
Prefer executing these files using the OSS-Fuzz or `python` command
methods outlined in the `fuzzing/README`.

Based on feedback and discussion on:
gitpython-developers#1901
This script is meant to be sourced by the OSS-Fuzz file of the same
name, rather than executed directly. The shebang may lead to the
incorrect assumption that the script is meant for direct execution.
Replacing it with this directive instructs ShellCheck to treat
the script as a Bash script, regardless of how it is executed.

Based @EliahKagan's suggestion and feedback on:
gitpython-developers#1901
This script is executed directly, not sourced as is the case with
`build.sh`, so it should have an executable bit set to avoid ambiguity.

Based @EliahKagan's suggestion and feedback on:
gitpython-developers#1901
- Make the link text for the OSS-Fuzz test status URL more descriptive
- Fix capitalization of GitPython repository name

Based @EliahKagan's suggestion and feedback on:
gitpython-developers#1901
Replaces the null character delimiter `-d $'\0'` with the simpler
empty string `-d ''` in the fuzzing harness build loop.

This changes leverages the Bash `read` builtin behavior to avoid
unnecessary complexity and improving script readability.

Based @EliahKagan's suggestion and feedback on:
gitpython-developers#1901
A misspelling in the https://github.com/gitpython-developers/qa-assets
repository is still present here. It will need to be fixed in that
repository first.

"corpora" is a difficult word to spell consistently I guess. This made
for a good opportunity to improve the phrasing of two other comments at
at least.

Based @EliahKagan's suggestion and feedback on:
gitpython-developers#1901
@DaveLak DaveLak marked this pull request as ready for review April 17, 2024 16:06
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@EliahKagan EliahKagan left a comment

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This looks good.

I wonder if corpra should be renamed to corpora in that path as well, or if that would cause problems.

If and only if that is changed, this line would then need to be changed accordingly:

rsync -avc qa-assets/gitpython/corpra/ "$SEED_DATA_DIR/" &&

Unrelated to that, there is a tiny style nit commented on below (which you may even decide to leave as-is).

@DaveLak
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DaveLak commented Apr 17, 2024

I wonder if corpra should be renamed to corpora in that path as well, or if that would cause problems.

It definitely should but among everything else related to the fuzzing work, updating that repo feels like the lowest priority. Especially considering right now it works exactly as we need it to, I've opted to defer any changes for now.

After the outstanding change requests are addressed, I would like (and plan) to revisit https://github.com/gitpython-developers/qa-assets. I think it would benefit from a structure similar to https://github.com/bitcoin-core/qa-assets. Specifically:

  1. A simple README with context about what's there, why, and how to use/improve it.
  2. Removal of the assets related to the unrelated projects.
  3. Updating it so the contents of each corpus are stored in a directory named for the fuzz harness they're used by instead of opaque zip blobs. That would require updating the container bootstrap script to zip them too.

I'm happy to discuss further if you would like but that feels like it would be best in a discussion thread (or an issue on https://github.com/gitpython-developers/qa-assets, but I'm not sure there is a desire to turn issues on there.)

DaveLak added 2 commits April 17, 2024 20:15
Also makes come structural improvements to how the local instructions
for running OSS-Fuzz are presented now that only the single `address`
sanitizer is a valid option.

The `undefined` sanitizer was removed from GitPython's `project.yaml`
OSS-Fuzz configuration file at the request of OSS-Fuzz project reviewers
in google/oss-fuzz#11803.

The `undefined` sanitizer is only useful in Python projects that use
native exstensions (such as C, C++, Rust, ect.), which GitPython does
not currently do. This commit updates the `fuzzing/README` reference to
that sanitizer accoirdingly.
See:
- google/oss-fuzz@b210fb2
- google/oss-fuzz#11803 (comment)
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@Byron Byron left a comment

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Thanks a lot for this follow-up and for sharing your plan of the additional improvements.

Not using zip blobs stored in the qa-assets repository is my favorite :).

@Byron Byron merged commit 00bc707 into gitpython-developers:main Apr 18, 2024
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DaveLak added a commit to DaveLak/oss-fuzz that referenced this pull request Apr 18, 2024
The upstream GitPython repository merged a change that set the
executable bit on `container-environment-bootstrap.sh` in Git, so the
`chmod` is no longer needed and the `RUN` instruction can execute the
script directly.

See:
- gitpython-developers/GitPython#1903
- gitpython-developers/GitPython@b0a5b8e
@DaveLak DaveLak deleted the fuzzing-integration-follow-ups branch April 22, 2024 20:15
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3 participants