netdev - Re: inbound connection problems when "netlink: test for all flags of the NLM_F

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Message-ID: <4D336050.9030602@netfilter.org>
Date:	Sun, 16 Jan 2011 22:17:04 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Arthur Marsh <arthur.marsh@...ernode.on.net>
CC:	Jan Engelhardt <jengelh@...ozas.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: inbound connection problems when "netlink: test for all flags
 of the NLM_F_DUMP composite" commit applied

On 16/01/11 13:25, Arthur Marsh wrote:
> Jan Engelhardt wrote, on 16/01/11 21:20:
>>
>> Le dimanche 16 janvier 2011 à 19:24 +1030, Arthur Marsh a écrit :
>>>
>>>> With kernels up to and including 2.6.37-git7, inbound telnetd-ssl
>>>> connections worked fine. With kernel 2.6.37-git9 and later inbound
>>>> telnetd-ssl connections failed, and on machine shut-down, there
>>>> were warning messages about daemons not return status.
>>
>> Which daemons are these? For reference, what distro do you happen
>> to use?
> 
> avahi-daemon (which gave multiple warning messages, hence I thought it
> may have been multiple packages)
> 
> I'm running Debian unstable with kernel.org kernels.
> 
>>
>>>> commit 0ab03c2b1478f2438d2c80204f7fef65b1bca9cf
>>>>      netlink: test for all flags of the NLM_F_DUMP composite
>>
>> Each of the hunks in this commit is independent of another.
>> Would you mind bisecting these too?
> 
> Recompiling with the only the first patch (attached) resulted in a
> repeat of the problem.
> 
> I've removed one person from the cc: list as they did not want to
> receive email about this even though they signed off the commit.

Please, pass this patch to the avahi-daemon developers. They use an
invalid netlink flag combination for dump operations.

This patch has spotted a problem that they have to fix indeed.


View attachment "fix-netlink-in-avahi.patch" of type "text/x-patch" (1688 bytes)