Arch Linux

lapsio

Member

From: Warsaw

Registered: 2015-09-30

Posts: 50

Arch - kernel live patching

Does Arch support any kind of live kernel patching? I'm using Arch with kernel-hardened for KVM virtualization host and It's quite troublesome to shutdown / hibernate all VMs before every kernel update. Especially that kernel updates in Arch are quite frequent. At the moment I'm just rarely updating host but it sounds like exact opposite of good solution...

Last edited by lapsio (2018-03-08 23:24:33)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,620

Re: Arch - kernel live patching

https://wiki.archlinux.org/index.php/Kexec

Trilby

Inspector Parrot

Registered: 2011-11-29

Posts: 29,514

Website

Re: Arch - kernel live patching

V1del, kexec still terminates all other processes, doesn't it.  It's basically a reboot without having to go through the hardware POST.

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"UNIX is simple and coherent..." - Dennis Ritchie, "GNU's Not UNIX" -  Richard Stallman

seth

Member

Registered: 2012-09-03

Posts: 50,924

Re: Arch - kernel live patching

https://linux-audit.com/livepatch-linux … rebooting/
https://wiki.archlinux.org/index.php/Ke … e_patching

You don't need the linux-kpatch kernel, "zgrep -i patch /proc/config.gz"

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V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,620

Re: Arch - kernel live patching

Ah you are right, my bad.  However I'd expect the answer to be no in that case, I'm not aware of any official implementations of that, similarly to pacman's delta package support, where the bits and pieces are theoretically availabe but not in a ready to use fashion.