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A comment on Meta Is Using the Linux Scheduler Designed for Valve's Steam Deck on Its Servers. Parent comment

Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by roblabla on Tuesday December 23, 2025 @03:59PM (#46369395)
Linux (well, more accurately, X11), has had a SAK for ages now, in the form of the CTRL+ALT+BACKSPACE that immediately kills X11, booting you back to the login screen.

I personally doubt SAK/SAS is a good security measure anyways. If you've got untrusted programs running on your machine, you're probably already pwn'd.

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Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by dangus on Tuesday December 23, 2025 @04:14PM (#46369543)
This setup came from the era of Windows running basically everything as administrator or something close to it.

The whole windows ecosystem had us trained to right click on any Windows 9X/XP program that wasn’t working right and “run as administrator” to get it to work in Vista/7.

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Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by TeMPOraL on Tuesday December 23, 2025 @04:32PM (#46369718)
The "threat model" (if anyone even called it that) of applications back then was bugs resulting in unintended spin-locks, and the user not realizing they're critically short on RAM or disk space.
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Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by eqvinox on Tuesday December 23, 2025 @08:00PM (#46371296)
That's not a SAK, you can disable it with setxkbmap. A SAK is on purpose impossible to disable, and it exists on Linux: Alt+SysRq+K.

Unfortunately it doesn't take any display server into consideration, both X11 and Wayland will just get killed.

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Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by roblabla on Tuesday December 23, 2025 @10:00PM (#46371964)
There are many a ways to disable CTRL+ALT+DEL on windows too, from registry tricks to group policy options. Overall, SAK seems to be a relic of the past that should be kept far away from any security consideration.
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Re:Meta Is Using the Linux Scheduler Designed for Valve's St... by IshKebab on Wednesday December 24, 2025 @04:22AM (#46373966)
There shouldn't be any non-privileged ways to disable ctrl-alt-del.
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