linux-kernel - Re: [PATCH v4 2/6] configfs-tsm: Introduce a shared ABI for attestation reports

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Message-ID: <CAMkAt6ohEnYwC8yVzye0F4gApvuyktHDP-q8-p7gJnSAyRMR_Q@mail.gmail.com>
Date:   Wed, 27 Sep 2023 08:38:16 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     Thomas Fossati <thomas.fossati@...aro.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        linux-coco@...ts.linux.dev,
        Dionna Amalie Glaze <dionnaglaze@...gle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Samuel Ortiz <sameo@...osinc.com>,
        Thomas Gleixner <tglx@...utronix.de>, peterz@...radead.org,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        dave.hansen@...ux.intel.com
Subject: Re: [PATCH v4 2/6] configfs-tsm: Introduce a shared ABI for
 attestation reports

On Wed, Sep 27, 2023 at 2:25 AM Thomas Fossati
<thomas.fossati@...aro.org> wrote:
>
> On Wed, 27 Sept 2023 at 10:21, Dan Williams <dan.j.williams@...el.com> wrote:
> > It can be expanded when/if those platforms expand the
> > size of the supported user data, or another configfs-tsm backend arrives
> > that needs that capability.
>
> Makes sense, thanks.

I'm not familiar with the rats eat spec but I would assume the
protocol would acquire more than just the nonce in the inblob.
Probably some combination of claims, nonce, and information about a
public key? Does the specification allow for the data needing to be
signed by the TSM to be hashed first?