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From:   Dionna Amalie Glaze <dionnaglaze@google.com>
Date:   Tue, 8 Aug 2023 13:04:53 -0700
Message-ID: <CAAH4kHYLPP5ehLBDkXxJQmnuFTjjRp+1tON5T9HqSxCvD1mSxA@mail.gmail.com>
Subject: Re: [PATCH 0/4] keys: Introduce a keys frontend for attestation reports
To:     James Bottomley <James.Bottomley@hansenpartnership.com>
Cc:     Dan Williams <dan.j.williams@intel.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@linux.intel.com>, dhowells@redhat.com,
        Brijesh Singh <brijesh.singh@amd.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Borislav Petkov <bp@alien8.de>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Samuel Ortiz <sameo@rivosinc.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-coco@lists.linux.dev, keyrings@vger.kernel.org,
        x86@kernel.org, linux-kernel@vger.kernel.org
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> Trusting the vTPM is a one time thing.  Once trust in the TPM is
> established, you don't need to be worried about replay and you can just
> use standard TPM primitives for everything onward, even when doing
> point in time runtime attestation.
>

It's a one time thing for who? It seems like you're still only looking
at the 1. use case and not the 2. use case. Every different person
establishing a connection with the service will need to independently
establish trust in the TPM.


-- 
-Dionna Glaze, PhD (she/her)