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this post was submitted on 06 Nov 2023
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Situation actually even worse https://madaidans-insecurities.github.io/linux.html#flatpak
I don't doubt it, but this is a good place to start.
This claim has interesting phrasing:
If you look at the GNOME post, you'll see they haven't argued against including a nested X server at all:
I'm not saying they haven't refused to acknowledge this elsewhere, but it's strange to point to this blog post which acknowledges that the sandbox is very much a work-in-progress and agrees with Madaidan that X11 is hard to secure.
Does Xpra provide better sandboxing than XWayland? If not, I think the Flatpak developer's solution to this is: just use Wayland. And obviously, there's plenty of room to improve with the permissions Flatpak does offer.
I did some searching on the Flatpak Github for issues and found that you can actually use Xpra with Flatpak, and the answer is "just use Wayland":
This is also concerning:
Source: https://privsec.dev/posts/linux/desktop-linux-hardening/#flatpak
It's great that GNOME Software notifies you when permissions change! I don't use Flatpak enough to know, but I hope
flatpak update
notifies you too if you don't use the-y
option.