Fix rootless xorg support

[jleclanche]

[10:48:14] <AnAkkk> after this change in the Xorg 1.16 arch package, SDDM no longer works correctly because at the time that X starts, it can't find the nvidia module https://bugs.archlinux.org/task/41259
[10:48:19] <AnAkkk> is that something we need to fix in sddm?
[10:48:44] <AnAkkk> I have to restart sddm with systemctl every time to make it work
[11:07:08] <AnAkkk> ok, actually it's related to the dkms systemd service + nvidia-dkms
[11:07:18] <AnAkkk> that I use to rebuild the nvidia module on kernel updates
[11:07:38] <AnAkkk> it seems to unload the nvidia module, X can't find it

[AnAkkk]

Ignore my messages, they actually fixed that in the archlinux xorg package, and they were unrelated to rootless xorg.
SDDM still needs support for that though, otherwise X is still ran as root.

[jleclanche]

Ok.

[bchretien]

👍 for rootless Xorg support (most Arch users would probably agree after the last Xorg update).

[jleclanche]

@plfiorini Was there any progress on this?

[tugit]

Debian testing allows running x without root, see https://www.phoronix.com/scan.php?page=news_item&px=Debian-Non-Root-X
I can start my Plasma 5 session by switching to a VT and type startx, then indeed X runs as the logged in user on the VT. When using sddm to login, X runs with root privileges.
Any progress ahead?

[xiangzhai]

oh yup #492

[tugit]

With major distributions supporting running x without root (fedora, arch, debian -> ubuntu) I consider it a security risk to run something as root when it does not have to.

Related discussion in case of lightdm: https://bugs.launchpad.net/lightdm/+bug/1292324

[jleclanche]

PRs welcome.

[plfiorini]

Let's try to do this for 0.14, we have ~2 months to do so.

[plfiorini]

Information:

• https://wiki.archlinux.org/index.php/Xorg
• https://fedoraproject.org/wiki/Changes/NonSetuidXorg
• https://fedoraproject.org/wiki/Changes/XorgWithoutRootRights