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These directories are in a location under application control, so we can't trust them to not be a symlink outside of the files accessibe to the application. Continue to treat --persist=/foo as --persist=foo for backwards compat, since this is how it (accidentally) worked before, but print a warning. Don't allow ".." elements in persist paths: these would not be useful anyway, and are unlikely to be in use, however they could potentially be used to confuse the persist path handling. This partially addresses CVE-2024-42472. If only one instance of the malicious or compromised app is run at a time, the vulnerability is avoided. If two instances can run concurrently, there is a time-of-check/time-of-use issue remaining, which can only be resolved with changes to bubblewrap; this will be resolved in a separate commit, because the bubblewrap dependency might be more difficult to provide in LTS distributions. Helps: CVE-2024-42472, GHSA-7hgv-f2j8-xw87 [smcv: Make whitespace consistent] [smcv: Use g_warning() if unable to create --persist paths] [smcv: Use stat() to detect symlinks and warn about them] Co-authored-by: Simon McVittie <smcv@collabora.com> Signed-off-by: Simon McVittie <smcv@collabora.com>
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