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

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Message-ID: <CA+1=6yehiG+-Mnn2Xk6TdPqjkucANpwLvcfLdd9sDG2foeyRaA@mail.gmail.com>
Date:   Wed, 27 Sep 2023 10:43:41 +0200
From:   Thomas Fossati <thomas.fossati@...aro.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-coco@...ts.linux.dev,
        Dionna Amalie Glaze <dionnaglaze@...gle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Peter Gonda <pgonda@...gle.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

Caveat: newbie here (just subscribed the linux-coco list) trying to
bridge the abstract language of IETF RATS with an actual
implementation of the architecture.

> +struct tsm_report {
> +     struct tsm_desc desc;
> +     size_t outblob_len;
> +     u8 *outblob;
> +     size_t certs_len;
> +     u8 *certs;
> +};

Could you clarify the semantics of @certs?

Are these what the IETF calls platform "endorsements" [1], [2]?
Or could a DICE report (which is a cert chain) fall into this bucket too?

If the former, maybe @endorsement_certs (or similar) would minimise ambiguity.

[1] https://www.rfc-editor.org/rfc/rfc9334.html#name-endorsements
[2] https://www.ietf.org/archive/id/draft-dthaler-rats-endorsements-02.html