linux-kernel - Re: iwlwifi WPA-TKIP crypto failure after group rekeying

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Date:	Sun, 4 Mar 2012 22:53:35 -0600
From:	Jonathan Nieder <jrnieder@...il.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Johannes Berg <johannes@...solutions.net>, 651199@...s.debian.org,
	Ben Hutchings <ben@...adent.org.uk>,
	Wey-Yi Guy <wey-yi.w.guy@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andreas Gustafsson <olangu@...ressions.se>,
	Marco d'Itri <md@...ux.IT>,
	Gabriel Kerneis <kerneis@....jussieu.fr>,
	Shawn Thompson <shawn@...jektenterprises.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: iwlwifi WPA-TKIP crypto failure after group rekeying

Hi,

Johannes Berg wrote:
> On Mon, 2012-02-27 at 05:33 +0000, Ben Hutchings wrote:

>> To summarise, a WPA-TKIP managed connection stops passing traffic and
>> the kernel log shows the message "WPA: Group rekeying".  This apparently
>> doesn't happen if the connection is in heavy use at the time or with
>> module parameter swcrypto=1.  WPA2 is not affected either.
>
> I think this is due to my patch "iwlagn: rewrite HW crypto" which
> accidentally broke key *removal* (of all things), which causes issues
> when the first GTK is removed on the second rekeying.
>
> This patch
> [...]h=5dcbf480473f6c3f06ad2426b7517038a2a18911
>
> should fix it. Wey has sent it to John
[...]
> it's also marked for stable.

Shawn Thompson (cc-ed) tested the patch against 3.2.9 and 3.3-rc6 and
found it to work[1].  What can interested people do to help usher this
into mainline?

(To recap, this was a regression introduced between 3.0 and 3.1,
presumably by v3.1-rc1~24^2~10^2^2~37.)

Thanks,
Jonathan

[1] http://bugs.debian.org/651199#147
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