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Message-ID: <1463873825.365411259761221182.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Wed, 2 Dec 2009 08:40:21 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: mac80211: fix two remote
exploits
----- "Eugene Teo" <eugeneteo@...nel.sg> wrote:
> http://git.kernel.org/linus/4253119acf412fd686ef4bd8749b5a4d70ea3a51
>
> "Lennert Buytenhek noticed a remotely triggerable problem in mac80211,
>
> which is due to some code shuffling I did that ended up changing the
> order in which things were done -- this was in
>
> commit d75636ef9c1af224f1097941879d5a8db7cd04e5
> Author: Johannes Berg <johannes@...solutions.net>
> Date: Tue Feb 10 21:25:53 2009 +0100
>
> mac80211: RX aggregation: clean up stop session
>
> The problem is that the BUG_ON moved before the various checks, and as
>
> such can be triggered.
>
> As the comment indicates, the BUG_ON can be removed since the
> ampdu_action callback must already exist when the state is
> OPERATIONAL.
>
> A similar code path leads to a WARN_ON in
> ieee80211_stop_tx_ba_session,
> which can also be removed."
>
> Btw, FYI, there's another issue that was also introduced by the same
> code shuffling patch (commit d75636ef) but was fixed in another patch
>
> (commit 827d42c9). It was assigned with CVE-2009-4026.
>
Hi Eugene,
I can't parse this. Can you help me understand.
What are the two issues the subject speaks of? Is the "similar code path"
paragraph of importance?
Thanks.
--
JB
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