linux-kernel - Re: [ 105/124] af_unix: dont send SCM_CREDENTIAL when dest socket is NULL

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Date:	Wed, 03 Apr 2013 10:58:37 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Sven Joachim <svenjoac@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Ding Tianhong <dingtianhong@...wei.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [ 105/124] af_unix: dont send SCM_CREDENTIAL when dest socket
 is NULL

On 04/03/2013 08:35 AM, Eric Dumazet wrote:
> On Wed, 2013-04-03 at 17:10 +0200, Sven Joachim wrote:
>> On 2013-04-03 16:00 +0200, Eric Dumazet wrote:
> 
>>
>>> It might be a wrong sender (application bug or bad identity), and udevd
>>> correctly discards the incoming message.
>>
>> How would I find out the culprit?
> 
> Change udevd to display the pid as well, and hopefully track the sender.
> 
> udevd receives uid and pid in the credentials.

This sounds suspiciously like an SCM_CREDENTIALS bug triggered by a
race.  There's a fix (that needs both a new version from me and a review
by someone) here:

http://www.spinics.net/lists/netdev/msg229948.html

--Andy
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