linux-kernel - Re: [GIT PULL] TPM DEVICE DRIVER: tpmdd-next-v6.18

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Message-ID: <CAHk-=wiCWiDcLEE3YqQo78piVHpwY2iXFW--6FbmFAURtor2+w@mail.gmail.com>
Date: Sun, 5 Oct 2025 11:09:08 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>, David Howells <dhowells@...hat.com>, 
	keyrings@...r.kernel.org, linux-integrity@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] TPM DEVICE DRIVER: tpmdd-next-v6.18

On Sun, 5 Oct 2025 at 08:47, Jarkko Sakkinen <jarkko@...nel.org> wrote:
>
>      This pull request disables
> TCG_TPM2_HMAC from the default configuration as it does not perform well
> enough [1].
>
> [1] https://lore.kernel.org/linux-integrity/20250825203223.629515-1-jarkko@kernel.org/

This link is entirely useless, and doesn't explain what the problem
was and *why* TPM2_TCG_HMAC shouldn't be on by default.

I think a much better link is

   https://lore.kernel.org/linux-integrity/20250814162252.3504279-1-cfenn@google.com/

which talks about the problems that TPM2_TCG_HMAC causes.

Which weren't just about "not performing well enough", but actually
about how it breaks TPM entirely for some cases.

              Linus