Re: [PATCH 0/5] security, efi: Set lockdown if in secure boot mode

[David Howells]

Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote:

> and print a subsequent line for every lockdown feature that is enabled, e.g.,
> 
> lockdown: disabling MSRs
> lockdown: disabling hibernate support

There's another problem with this idea: the lockdown facility is passive - it
doesn't go looking for things to lock down; rather, things that can be locked
down inquire as to whether lockdown is in effect at the point someone tries to
use them.

Now, I could reserve a variable for each thing we lock down to make sure that
we don't emit the message more than once, but I'm loathe to waste memory this
way.

I can't so easily switch the facility to being active either, since a lot of
the lockdownables are in modules.

David