linux-kernel - Re: Linux DRTM on UEFI platforms

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Message-ID: <20220706001233.GA5802@srcf.ucam.org>
Date:   Wed, 6 Jul 2022 01:12:33 +0100
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Brendan Trotter <btrotter@...il.com>
Cc:     The development of GNU GRUB <grub-devel@....org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Alec Brown <alec.r.brown@...cle.com>,
        Kanth Ghatraju <kanth.ghatraju@...cle.com>,
        Ross Philipson <ross.philipson@...cle.com>,
        "piotr.krol@...eb.com" <piotr.krol@...eb.com>,
        "krystian.hebel@...eb.com" <krystian.hebel@...eb.com>,
        "persaur@...il.com" <persaur@...il.com>,
        "Yoder, Stuart" <stuart.yoder@....com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        "michal.zygowski@...eb.com" <michal.zygowski@...eb.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        "lukasz@...rylko.pl" <lukasz@...rylko.pl>,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        James Morris <jmorris@...ei.org>
Subject: Re: Linux DRTM on UEFI platforms

On Wed, Jul 06, 2022 at 09:33:23AM +0930, Brendan Trotter wrote:

> The only correct approach is "efi-stub -> head_64.S -> kernel's own
> secure init"; where (on UEFI systems) neither GRUB nor Trenchboot has
> a valid reason to exist and should never be installed.

Surely the entire point of DRTM is that we *don't* have to trust the 
bootloader?