linux-kernel - Re: [PATCH] tpm: Disable TCG_TPM2

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Message-ID: <aKNmHDVHV1DufJEd@kernel.org>
Date: Mon, 18 Aug 2025 20:42:52 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Chris Fenner <cfenn@...gle.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@....fi>,
	Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
	linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tpm: Disable TCG_TPM2_HMAC by default

On Fri, Aug 15, 2025 at 11:09:07AM -0700, Chris Fenner wrote:
> > I'm happy to make patch next week for this change too. So probably this
> > where I align myself to. It's just the best average IMHO. Everyone gets
> > exactly what they want, right?
> 
> To be clear: I already have what I want (the ability to disable this
> feature because it seems broken to me), I'm just making
> recommendations as a TPM abyssal domain expert. I hope my feedback is
> of some use on this -- the work of dealing with interposer attackers
> is quite important and I appreciate the effort already put in by the
> team.

So, if the feature is locked into persistent handle, the net effect
meets the same goals. I'll pursue on a patch.

> 
> Thanks
> Chris

BR, Jarkko