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

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Message-ID: <20230130120052.7wfb5i2vql5ibkso@box.shutemov.name>
Date:   Mon, 30 Jan 2023 15:00:52 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Christophe de Dinechin <dinechin@...hat.com>
Cc:     "Reshetova, Elena" <elena.reshetova@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "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 Mon, Jan 30, 2023 at 12:36:34PM +0100, Christophe de Dinechin wrote:
> Is there for example anything that precludes TDX or SEV from executing
> code in the bounce buffers?

In TDX, attempt to fetch instructions from shared memory (i.e. bounce
buffer) will cause #GP, only data fetch is allowed. Page table also cannot
be placed there and will cause the same #GP.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov