linux-kernel - Re: Linux guest kernel threat model for Confidential Computing

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Message-ID: <20230208041913-mutt-send-email-mst@kernel.org>
Date:   Wed, 8 Feb 2023 04:31:03 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Carlos Bilbao <carlos.bilbao@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        "Shishkin, Alexander" <alexander.shishkin@...el.com>,
        "Shutemov, Kirill" <kirill.shutemov@...el.com>,
        "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Wunner, Lukas" <lukas.wunner@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jason Wang <jasowang@...hat.com>,
        "Poimboe, Josh" <jpoimboe@...hat.com>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        Cfir Cohen <cfir@...gle.com>, Marc Orr <marcorr@...gle.com>,
        "jbachmann@...gle.com" <jbachmann@...gle.com>,
        "pgonda@...gle.com" <pgonda@...gle.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        "Lange, Jon" <jlange@...rosoft.com>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux guest kernel threat model for Confidential Computing

On Tue, Feb 07, 2023 at 08:51:56PM -0500, Theodore Ts'o wrote:
> Why not just simply compile a special CoCo kernel that doesn't have
> any drivers that you don't trust.

Or at least, start with that? You can then gradually expand that until
some config is both acceptable to distros and seems sufficiently trusty
to the CoCo project. Lots of kernel features got upstreamed this way.
Requirement to have an arbitrary config satisfy CoCo seems like a very
high bar to clear.

-- 
MST