Hi Philipp On Tue, 29 Nov 2022 at 15:32, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > On Tue, 29 Nov 2022 14:44:50 +0100 > Philipp Rudo <prudo@xxxxxxxxxx> wrote: > > > An alternative approach and sort of compromise I see is to convert > > kexec_load_disabled from a simple on/off switch to a counter on how > > often a kexec load can be made (in practice a tristate on/off/one-shot > > should be sufficient). Ideally the reboot and panic path will > > have separate counters. With that you could for example use > > kexec_load_limit.reboot=0 and kexec_load_limit.panic=1 to disable the > > load of images for reboot while still allow to load a crash kernel > > once. With this you have the flexibility you need while also preventing > > a race where an attacker overwrites your crash kernel before you can > > toggle the switch. What do you think? > > I actually like this idea :-) In case you missed it. I sent an initial implementation of this at https://lore.kernel.org/lkml/20221114-disable-kexec-reset-v2-0-c498313c1bb5@xxxxxxxxxxxx/ Regards! > > -- Steve -- Ricardo Ribalda
