Why sysrq is limited to only "sync" command on official fedora kernel?

Reindl Harald h.reindl at thelounge.net
Wed Feb 25 17:44:21 UTC 2015

Am 25.02.2015 um 18:37 schrieb Paul Wouters:
> On Wed, 25 Feb 2015, Lennart Poettering wrote:
>> Hmm? Syncing is allowed to my knowledge. C-a-d and gdm allow a clean
>> reboot/poweroff. But sysrq does an abnormal reboot/poweroff, which we
>> cannot allow. Similar, remounting read-only is also security senstive,
>> which we cannot allow.
>> Without being logged in there's very little you can do on a host right
>> now, and sysrq should not open up more there by default.
> You must have forgotten your university days....
> The alternative to not being able to sync-umount-boot using sysrq is to
> flip the switch. I'd rather have them use sysrq.
> I said it when they closed X ctrl-alt-backspace and I'll say it now.
> When you are on console with the power plug, preventing these actions
> is stupid

when you are on a machine where you have pysical only keyboard and mouse 
it is not - not every PC stands in front of your face - think about 
kiosk mode and so on...

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