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

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Message-ID: <nycvar.YEU.7.76.2301252112120.3004@gjva.wvxbf.pm>
Date:   Wed, 25 Jan 2023 21:13:56 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        "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>,
        "Michael S. Tsirkin" <mst@...hat.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 Wed, 25 Jan 2023, Greg Kroah-Hartman wrote:

> How do you trust you got real data on the disk?  On the network?  Those 
> are coming from the host, how is any of that data to be trusted?  Where 
> does the trust stop and why?

This is all well described in AMD SEV-SNP documentation, see page 5 of 
[1]. All the external devices are treated as untrusted in that model.

[1] https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf

-- 
Jiri Kosina
SUSE Labs