linux-kernel - Re: [PATCH v3] tpm: Relocate buf->handles to appropriate place

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Message-Id: <D2R6WEDWRFMK.247OVMZQ9ME6Z@kernel.org>
Date: Tue, 16 Jul 2024 21:54:11 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko@...nel.org>, <linux-integrity@...r.kernel.org>
Cc: <stable@...r.kernel.org>, "James Bottomley"
 <James.Bottomley@...senPartnership.com>, "Mimi Zohar"
 <zohar@...ux.ibm.com>, "David Howells" <dhowells@...hat.com>, "Paul Moore"
 <paul@...l-moore.com>, "James Morris" <jmorris@...ei.org>, "Serge E.
 Hallyn" <serge@...lyn.com>, <keyrings@...r.kernel.org>,
 <linux-security-module@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] tpm: Relocate buf->handles to appropriate place

On Tue Jul 16, 2024 at 9:52 PM EEST, Jarkko Sakkinen wrote:
> tpm_buf_append_name() has the following snippet in the beginning:
>
> 	if (!tpm2_chip_auth(chip)) {
> 		tpm_buf_append_u32(buf, handle);
> 		/* count the number of handles in the upper bits of flags */
> 		buf->handles++;
> 		return;
> 	}
>
> The claim in the comment is wrong, and the comment is in the wrong place
> as alignment in this case should not anyway be a concern of the call
> site. In essence the comment is  lying about the code, and thus needs to
> be adressed.
>
> Further, 'handles' was incorrectly place to struct tpm_buf, as tpm-buf.c
> does manage its state. It is easy to grep that only piece of code that
> actually uses the field is tpm2-sessions.c.
>
> Address the issues by moving the variable to struct tpm_chip.
>
> Cc: stable@...r.kernel.org # v6.10+
> Fixes: 699e3efd6c64 ("tpm: Add HMAC session start and end functions")
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
>

Dashes missing but I can fix that when I apply this. Just like to keep
change log in git and I add the dashes before sending...

> v3:
> * Reset chip->handles in the beginning of tpm2_start_auth_session()
>   so that it shows correct value, when TCG_TPM2_HMAC is enabled but
>   tpm2_sessions_init() has never been called.
> v2:
> * Was a bit more broken than I first thought, as 'handles' is only
>   useful for tpm2-sessions.c and has zero relation to tpm-buf.c.
> ---

BR, Jarkko