linux-kernel - Re: [PATCH 1/2] Revert "af_unix: dont send SCM

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Date:	Fri, 05 Apr 2013 00:47:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	svenjoac@....de, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	dingtianhong@...wei.com, edumazet@...gle.com, luto@...capital.net,
	ksrot@...hat.com, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH 1/2] Revert "af_unix: dont send SCM_CREDENTIAL when
 dest socket is NULL"

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Wed, 03 Apr 2013 19:13:35 -0700

> 
> This reverts commit 14134f6584212d585b310ce95428014b653dfaf6.
> 
> The problem that the above patch was meant to address is that af_unix
> messages are not being coallesced because we are sending unnecesarry
> credentials.  Not sending credentials in maybe_add_creds totally
> breaks unconnected unix domain sockets that wish to send credentails
> to other sockets.
> 
> In practice this break some versions of udev because they receive a
> message and the sending uid is bogus so they drop the message.
> 
> Cc: stable@...r.kernel.org
> Reported-by: Sven Joachim <svenjoac@....de>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Applied.
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