linux-kernel - Re: [systemd-devel] [PATCH 0/1] x86/kexec: UKI support

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Date:   Mon, 11 Sep 2023 19:20:12 -0400
From:   Neal Gompa <ngompa13@...il.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     Jan Hendrik Farr <kernel@...rr.cc>, linux-kernel@...r.kernel.org,
        systemd-devel@...ts.freedesktop.org, x86@...nel.org,
        kexec@...ts.infradead.org, dhowells@...hat.com,
        keyrings@...r.kernel.org, bluca@...ian.org, bhelgaas@...gle.com,
        tglx@...utronix.de, akpm@...ux-foundation.org
Subject: Re: [systemd-devel] [PATCH 0/1] x86/kexec: UKI support

On Mon, Sep 11, 2023 at 7:15 PM Jarkko Sakkinen <jarkko@...nel.org> wrote:
>
> On Sat Sep 9, 2023 at 7:18 PM EEST, Jan Hendrik Farr wrote:
> > Hello,
> >
> > this patch implements UKI support for kexec_file_load. It will require support
> > in the kexec-tools userspace utility. For testing purposes the following can be used:
> > https://github.com/Cydox/kexec-test/
> >
> > There has been discussion on this topic in an issue on GitHub that is linked below
> > for reference.
> >
> >
> > Some links:
> > - Related discussion: https://github.com/systemd/systemd/issues/28538
> > - Documentation of UKIs: https://uapi-group.org/specifications/specs/unified_kernel_image/
> >
> > Jan Hendrik Farr (1):
> >   x86/kexec: UKI support
> >
> >  arch/x86/include/asm/kexec-uki.h       |   7 ++
> >  arch/x86/include/asm/parse_pefile.h    |  32 +++++++
> >  arch/x86/kernel/Makefile               |   2 +
> >  arch/x86/kernel/kexec-uki.c            | 113 +++++++++++++++++++++++++
> >  arch/x86/kernel/machine_kexec_64.c     |   2 +
> >  arch/x86/kernel/parse_pefile.c         | 110 ++++++++++++++++++++++++
> >  crypto/asymmetric_keys/mscode_parser.c |   2 +-
> >  crypto/asymmetric_keys/verify_pefile.c | 110 +++---------------------
> >  crypto/asymmetric_keys/verify_pefile.h |  16 ----
> >  9 files changed, 278 insertions(+), 116 deletions(-)
> >  create mode 100644 arch/x86/include/asm/kexec-uki.h
> >  create mode 100644 arch/x86/include/asm/parse_pefile.h
> >  create mode 100644 arch/x86/kernel/kexec-uki.c
> >  create mode 100644 arch/x86/kernel/parse_pefile.c
> >
> > --
> > 2.40.1
>
> What the heck is UKI?

Unified Kernel Images. More details available here:
https://uapi-group.org/specifications/specs/unified_kernel_image/

It's a way of creating initramfs-style images as fully generic,
reproducible images that can be built server-side.

It is a requirement for creating locked down Linux devices for
appliances that can be tamper-resistant too.




--
真実はいつも一つ！/ Always, there's only one truth!