linux-kernel - Re: [PATCH 6/6] mac80211/wpa: use constant time memory comparison for MACs

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Message-ID: <1497342000.6068.3.camel@sipsolutions.net>
Date:   Tue, 13 Jun 2017 10:20:00 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Cc:     linux-wireless@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 6/6] mac80211/wpa: use constant time memory comparison
 for MACs

On Sat, 2017-06-10 at 04:59 +0200, Jason A. Donenfeld wrote:
> Otherwise, we enable all sorts of forgeries via timing attack.

I'm not really sure that this is actually true, since you don't get
much feedback on your frame that's dropped, especially if you're
attacking from remote. Basically, I don't see how you can observe the
timing of this operation?

Anyway, applied.

johannes