linux-kernel - Re: [PATCH v3 1/4] tpm2-sessions: fix out of range indexing in name

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Message-ID: <aTHXRuvbUkCiQQAL@kernel.org>
Date: Thu, 4 Dec 2025 20:47:34 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Jonathan McDowell <noodles@...th.li>
Cc: linux-integrity@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	open list <linux-kernel@...r.kernel.org>, 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>,
	Ard Biesheuvel <ardb@...nel.org>,
	"open list:KEYS-TRUSTED" <keyrings@...r.kernel.org>,
	"open list:SECURITY SUBSYSTEM" <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] tpm2-sessions: fix out of range indexing in
 name_size

On Thu, Dec 04, 2025 at 03:11:26PM +0000, Jonathan McDowell wrote:
> On Thu, Dec 04, 2025 at 12:12:11AM +0200, Jarkko Sakkinen wrote:
> > 'name_size' does not have any range checks, and it just directly indexes
> > with TPM_ALG_ID, which could lead into memory corruption at worst.
> > 
> > Address the issue by only processing known values and returning -EINVAL for
> > unrecognized values.
> > 
> > Make also 'tpm_buf_append_name' and 'tpm_buf_fill_hmac_session' fallible so
> > that errors are detected before causing any spurious TPM traffic.
> > 
> > End also the authorization session on failure in both of the functions, as
> > the session state would be then by definition corrupted.
> > 
> > Cc: stable@...r.kernel.org # v6.10+
> > Fixes: 1085b8276bb4 ("tpm: Add the rest of the session HMAC API")
> > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> 
> A minor whitespace query below, but:
> 
> Reviewed-by: Jonathan McDowell <noodles@...a.com>

Thanks. I updated the commit and removed the extra whitespace.

BR, Jarkko