Re: Unable to disable SysRq

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On Tue, Nov 17, 2020 at 01:10:02PM +0100, Kevin Kofler via devel wrote:
> Robert Marcano via devel wrote:
> > Two times in a week I have killed all processes trying to use Alt+i. Ts
> > is to easy to press the Alt and the PrtScr at the same, starting that
> > way the SysRq i command.
> > 
> > So before staring to write a kernel patch to add an option where the
> > SysRq is only triggered by the Left Alt key. I decided to initially
> > disable sysrq entirely.
> [followed by technical details of why that failed]
> 
> This is funny because SysRq is supposed to be disabled by default in Fedora 
> to begin with, for security reasons.

According to https://fedoraproject.org/wiki/QA/Sysrq

16 - enable sync command

64 - enable signalling of processes (term, kill, oom-kill)

80 = 16+64 and enables both of the above.

Sync seems safe to always leave enabled.  Killing processes probably not.

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