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

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Message-ID: <CAHk-=whSe9AGigVydkwo=ewE6_GFTJ_rU=XzO=v1N1sWyfVmAw@mail.gmail.com>
Date: Sun, 5 Oct 2025 11:24:09 -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:
>
> and apologies for this late pull request. This pull request disables
> TCG_TPM2_HMAC from the default configuration as it does not perform well
> enough

So having looked more at this, not only does it disable that
TCG_TPM2_HMAC, it does a lot of other things too.

I really am going to require a better pull request, and I have thrown
this one away.

The exclusive access looks debatable to me too. I think you should
also require that the open was done not only with O_EXCL, but as a
write too.

Exclusive reads do not make sense.

Now, I certainly *hope* that nobody has /dev/tmp being world-readable,
so it probably doesn't matter, but that new exclusive access thing is
very different than what the code used to do, and if I read it
correctly it will also disable the kernel doing certain operations. So
it needs to be as limited as possible.

And damn it, it needs to be *explained*. Not have a pull request where
one single line is explained badly.

             Linus