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

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Date:	Wed, 3 Apr 2013 08:27:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Sven Joachim <svenjoac@....de>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	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 Wed, Apr 03, 2013 at 05:10:40PM +0200, Sven Joachim wrote:
> On 2013-04-03 16:00 +0200, Eric Dumazet wrote:
> 
> > On Wed, 2013-04-03 at 13:41 +0200, Sven Joachim wrote:
> >> On 2013-04-03 00:11 +0200, Greg Kroah-Hartman wrote:
> >> 
> >> > 3.8-stable review patch.  If anyone has any objections, please let me know.
> >> 
> >> I'm seeing several complaints from udevd at boot in both 3.8.6-rc1 and
> >> 3.9-rc5: "udevd[56]: sender uid=65534, message ignored".  Reverting the
> >> patch below on top of 3.8.6-rc1 fixes that.  I'm using udev version 175
> >> here, and 65534 is the uid of user "nobody".
> >
> > And if you use a 3.1 kernel (before commit
> > 16e5726269611b71c930054ffe9b858c1cea88eb) are you seeing this message ?
> 
> No (tested with 3.1.10).
> 
> > 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?

Try running 'udevadm monitor' as root and see if something shows up
there.

I can't reproduce this here, running a newer version of udev (195),
sorry, I don't have any systems with older udev releases.

Note, someone else posted this same error earlier today on the linux-usb
mailing list, saying that USB storage devices would not automount
anymore.  Does that work properly for you?

thanks,

greg k-h
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