linux-kernel - Re: [PATCH v2 0/2] x86/kexec: UKI Support

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Date:   Wed, 20 Sep 2023 16:40:04 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Jan Hendrik Farr <kernel@...rr.cc>
Cc:     Philipp Rudo <prudo@...hat.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, x86@...nel.org, tglx@...utronix.de,
        dhowells@...hat.com, vgoyal@...hat.com, keyrings@...r.kernel.org,
        akpm@...ux-foundation.org, Baoquan He <bhe@...hat.com>,
        bhelgaas@...gle.com, Luca Boccassi <bluca@...ian.org>,
        lennart@...ttering.net, "Liu, Pingfan" <piliu@...hat.com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v2 0/2] x86/kexec: UKI Support

On Wed, 20 Sept 2023 at 15:43, Dave Young <dyoung@...hat.com> wrote:
>
> > > In the end the only benefit this series brings is to extend the
> > > signature checking on the whole UKI except of just the kernel image.
> > > Everything else can also be done in user space. Compared to the
> > > problems described above this is a very small gain for me.
> >
> > Correct. That is the benefit of pulling the UKI apart in the
> > kernel. However having to sign the kernel inside the UKI defeats
> > the whole point.
>
>
> Pingfan added the zboot load support in kexec-tools, I know that he is
> trying to sign the zboot image and the inside kernel twice. So
> probably there are some common areas which can be discussed.
> Added Ard and Pingfan in cc.
> http://lists.infradead.org/pipermail/kexec/2023-August/027674.html
>

Here is another thread of the initial try in kernel with a few more
options eg. some fake efi service helpers.
https://lore.kernel.org/linux-arm-kernel/ZBvKSis+dfnqa+Vz@piliu.users.ipa.redhat.com/T/#m42abb0ad3c10126b8b3bfae8a596deb707d6f76e

>
> Thanks
> Dave