#940100 sddm: empty xorg-session.log in directories with random names

Package:
sddm
Source:
sddm
Description:
modern display manager for X11
Submitter:
Lasse Kliemann
Date:
2026-10-13 02:39:02 UTC
Severity:
important
#940100#5
Date:
2019-09-12 12:03:35 UTC
From:
To:
Dear Maintainer,

upon each login, the following directories and file are created in the user's home directory:

<random>/.local/share/sddm/xorg-session.log

Here, <random> is a two-letter string, such as 2V or ;V or �U. The random part changes, so with time, the home directory will be cluttered.

The file xorg-session.log is empty.

Apperently the same problem is described at https://www.reddit.com/r/openSUSE/comments/aqdqhj/many_xorgsession_logs_in_home/, but no solution is given.

Thanks for looking into this.
#940100#10
Date:
2019-09-13 11:44:29 UTC
From:
To:
There seems to be a fix available in an OpenSUSE package of SDDM:

https://www.reddit.com/r/openSUSE/comments/atw78q/random_folders_appearing_in_fresh_tubmleweed_kde/
#940100#15
Date:
2026-10-13 02:37:26 UTC
From:
To:
Version: 0.18.1-1


The random directory prefixes described in this report match a
use-after-free in SDDM 0.18.0. UserSession::setupChildProcess()
freed the getpwnam_r() buffer before using pw.pw_dir to construct
the session log path.

Upstream release-branch commit e4ec22d0f46eb3837d9f29a7b0c5a6ca1a4433dd
keeps that buffer alive with QScopedPointer and copies the home directory
before constructing the log path. The fix is present in upstream
0.18.1 and Debian 0.18.1-1.

Closing with the historical fixed version.

Regards,
Boyuan Yang