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udmabuf allows clients to allocate virtual memory as dmabufs, which then potentially can be imported by other dma subsystems - most importantly GPU drivers and KMS. This can avoid copies and thus increase performance. Unlike other dmabuf allocators like e.g. dma heaps this doesn't have known issues relevant for sandboxing. Notably memory accounting works as expected, so apps can't use udmabuf to escape resource limitations. For this reason systemd, since version 257[1], grants "uaccess" access to udmabuf by default, considering it as "safe". With udmabuf increasingly being availably by default, various apps and libraries start making use of it - examples include libcamera, mesa llvmpipe and Gstreamer. Thus let's grant access to it in Flatpak as well. For now limit it to "dri" access as sharing buffers with GPUs is the most common use-case. There is no strong reason to not lift restrictions further if the need arises, though. 1: https://github.com/systemd/systemd/pull/33738 Signed-off-by: Sebastian Wick <sebastian@sebastianwick.net> Signed-off-by: Robert Mader <robert.mader@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