linux-kernel - Re: [PATCH V34 10/29] hibernate: Disable when the kernel is locked down

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Message-ID: <20190711041145.GA28145@linux-l9pv.suse>
Date:   Thu, 11 Jul 2019 12:11:45 +0800
From:   joeyli <joeyli.kernel@...il.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Pavel Machek <pavel@....cz>,
        Matthew Garrett <matthewgarrett@...gle.com>, jmorris@...ei.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Josh Boyer <jwboyer@...oraproject.org>,
        David Howells <dhowells@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>, rjw@...ysocki.net,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH V34 10/29] hibernate: Disable when the kernel is locked
 down

Hi experts,

On Mon, Jun 24, 2019 at 03:21:23PM +0200, Jiri Kosina wrote:
> On Sat, 22 Jun 2019, Pavel Machek wrote:
> 
> > > There is currently no way to verify the resume image when returning
> > > from hibernate.  This might compromise the signed modules trust model,
> > > so until we can work with signed hibernate images we disable it when the
> > > kernel is locked down.
> > 
> > I keep getting these...
> > 
> > IIRC suse has patches to verify the images.
> 
> Yeah, Joey Lee is taking care of those. CCing.
>

The last time that I sent for hibernation encryption and authentication is
here:
    https://lkml.org/lkml/2019/1/3/281

It needs some big changes after review:
 - Simplify the design: remove keyring dependency and trampoline.
 - Encrypted whole snapshot image instead of only data pages.
 - Using TPM:
        - Direct use TPM API in hibernation instead of keyring
        - Localities (suggested by James Bottomley)

I am still finding enough time to implement those changes, especial TPM
parts.

Thanks
Joey Lee