Re: Supporting hibernation in Workstation ed., draft 1

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On Tuesday, June 2, 2020 10:52:07 PM MST Chris Murphy wrote:
> On Tue, Jun 2, 2020 at 8:42 PM John M. Harris Jr <johnmh@xxxxxxxxxxxxx>
> wrote:
 
> 
> > In what way is it incompatible with UEFI Secure Boot?
> 
> 
> Secure Boot does boot verification. Hibernation right now doesn't. And
> that makes it a Secure Boot loophole. And that makes it incompatible
> with Secure Boot.
> 
> It's not a new idea, it's been this way for a while. And so have the
> complaints. https://lwn.net/Articles/523367/
> 
> <If the kernel and
> 
> > initramfs are signed, and the resume image is for that kernel, how is this
> > an issue?
> 
> 
> The initramfs is not signed.
> 
> 
> > What if swap is on LUKS?
> 
> 
> No signature. No integrity. It is a net reduction in the protection
> provided by Secure Boot - e.g. it can't detect intentional corruption
> that could crash the system or even cause more corruption and eventual
> data loss as the system runs.
> 
> 
> > If kernel lockdown is what disables this, we should look at fixing kernel
> > lockdown so that it doesn't break hibernation. This is definitely a
> > security decision that we shouldn't be imposing on the masses
> > needlessly, in my opinion.
> 
> 
> Instead you propose imposing a loophole for attackers to easily deploy
> malware needlessly. Do you really not see how this is an untenable
> position for Fedora?

In my opinion, the threat model you're proposing here is absurd. If people can 
create a valid kernel image that will be loaded from a LUKS container, we have 
bigger problems.

-- 
John M. Harris, Jr.

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