netdev - Re: [PATCH net-next 1/3] ipv6: sr: Fix MAC comparison to be constant-time

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Message-ID: <20250818193849.GB12939@google.com>
Date: Mon, 18 Aug 2025 19:38:49 +0000
From: Eric Biggers <ebiggers@...nel.org>
To: Andrea Mayer <andrea.mayer@...roma2.it>
Cc: netdev@...r.kernel.org, David Lebrun <dlebrun@...gle.com>,
	stable@...r.kernel.org, stefano.salsano@...roma2.it,
	Paolo Lungaroni <paolo.lungaroni@...roma2.it>
Subject: Re: [PATCH net-next 1/3] ipv6: sr: Fix MAC comparison to be
 constant-time

On Mon, Aug 18, 2025 at 09:16:07PM +0200, Andrea Mayer wrote:
> On Fri, 15 Aug 2025 20:11:34 -0700
> Eric Biggers <ebiggers@...nel.org> wrote:
> 
> > To prevent timing attacks, MACs need to be compared in constant time.
> > Use the appropriate helper function for this.
> > 
> > Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Eric Biggers <ebiggers@...nel.org>
> > ---
> >  net/ipv6/seg6_hmac.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> 
> Hi Eric,
> 
> Thanks for the fix!
> 
> I believe it would be best to submit this fix separately from the current patch
> set. Since this addresses a bug rather than an enhancement or cleanup, sending
> it individually with the 'net' tag will help facilitate applying this patch to
> the net tree.
> 
> Ciao,
> Andrea

Then there would be a merge conflict between the two patchsets.

I can do that if you want, but then I'd probably have to wait for this
patch to reach net-next before the rest can proceed.

- Eric