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Sebastian Wick
4780729720
Replace path-based flatpak_mkdir_p calls in flatpak_ensure_data_dir with glnx_chase_and_mkdirat(RESOLVE_NO_SYMLINKS) to prevent an app from replacing subdirectories of its data dir with symlinks between runs and having them followed during the next sandbox setup. In flatpak_run_setup_base_argv, replace path-based --bind args for the app cache/data/config/tmp directories with --bind-fd using fds obtained via glnx_chaseat(RESOLVE_NO_SYMLINKS), preventing both symlink following and TOCTOU races when setting up these bind mounts. Assisted-by: Claude:opus-4.6 Resolves: https://github.com/flatpak/flatpak/security/advisories/GHSA-8688-9x26-hhxj
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.
See https://flatpak.org/ for more information.
Flatpak is available in the package repositories of most Linux distributions and can be installed from there. See https://flatpak.org/setup/ for quick setup instructions for many distributions.
Community discussion happens in #flatpak:matrix.org, on the mailing list, and on the Flathub Discourse.
Read documentation for Flatpak here.
Contributing
Flatpak welcomes contributions from anyone! Here are some ways you can help:
- Fix one of the issues and submit a PR
- Update flatpak's translations and submit a PR
- Improve flatpak's documentation, hosted at http://docs.flatpak.org and developed over in flatpak-docs
- Find a bug and submit a detailed report including your OS, flatpak version, and the steps to reproduce
- Add your favorite application to Flathub by writing a flatpak-builder manifest and submitting it
- Improve the Flatpak support in your favorite Linux distribution
Hacking
See CONTRIBUTING.md
Related Projects
Here are some notable projects in the Flatpak ecosystem:
- Flatseal: An app for managing permissions of Flatpak apps without using the CLI
- Flat-manager: A tool for managing Flatpak repositories