netdev - Re: [PATCH] net: net_cls: fd passed in SCM

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Date:	Mon, 21 Jan 2013 11:16:50 +0100
From:	Daniel Wagner <wagi@...om.org>
To:	Li Zefan <lizefan@...wei.com>
CC:	netdev@...r.kernel.org, cgroups@...r.kernel.org,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	John Fastabend <john.r.fastabend@...el.com>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH] net: net_cls: fd passed in SCM_RIGHTS datagram not set
 correctly

On 21.01.2013 10:54, Li Zefan wrote:
> On 2013/1/21 17:38, Daniel Wagner wrote:
>> From: Daniel Wagner <daniel.wagner@...-carit.de>
>>
>> Commit 6a328d8c6f03501657ad580f6f98bf9a42583ff7 changed the update
>> logic for the socket but it does not update the SCM_RIGHTS update
>> as well. This patch is based on the net_prio fix commit
>>
>> 48a87cc26c13b68f6cce4e9d769fcb17a6b3e4b8
>>
>>      net: netprio: fd passed in SCM_RIGHTS datagram not set correctly
>>
>>      A socket fd passed in a SCM_RIGHTS datagram was not getting
>>      updated with the new tasks cgrp prioidx. This leaves IO on
>>      the socket tagged with the old tasks priority.
>>
>>      To fix this add a check in the scm recvmsg path to update the
>>      sock cgrp prioidx with the new tasks value.
>>
>> Let's apply the same fix for net_cls.
>>
>> Reported-by: Li Zefan <lizefan@...wei.com>
> 
> Acutally I didn't report this. 

You made me look into this, so you reported it at least in my eyes :)

> I was about to send exactly the same
> patch and then I noticed the shared socket issue. ;)

I don't mind if you want your patch to be applied. I just felt
responsible for the changes I did.

thanks,
daniel

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