this post was submitted on 13 Jun 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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This is a known Xorg issue. Distros like TAILS have patches (can't find a source right now, but it was probably 6+ years ago). The solution is Wayland, since despite TAILS fixing it, no one else seems to have bothered.
(I have the same problem on Fedora 40 XFCE)
I believe it's also highly recommended to use Xscreensaver specifically as the author is well aware of the risks and limitations and does as much as possible to guard against all known ways to bypass it.
KDE did bother, this does neither happen with KScreenlocker, nor do non-screenlocker windows show in another way, because the screen locker is integrated with the compositor.
If the compositor crashes or gets disabled somehow ofc though, that integration doesn't help either and you have to rely on a mountain of bad hacks as well as the hope that the screen locker doesn't also crash for nothing to happen in that case, but it's as close to secure screen locking as you get on Xorg... in the end the solution for secure screen locking is still Wayland.
When my KDE screenlocker crashes on Wayland, all my monitors tell me to switch to a TTY and run a manual unlock. Which is reassuring!
I recently realised that TAILS uses Wayland. For whole time I've been thinking that it uses X11 like Debian by default, but to my surprise, it doesn't.