linux-kernel - Re: [PATCH] Remove broken netfilter binary sysctls from bridging code

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Date:	Tue, 25 Sep 2007 06:07:24 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] Remove broken netfilter binary sysctls from bridging
 code

Stephen Hemminger wrote:
> On Mon, 24 Sep 2007 18:55:38 +0200
> Patrick McHardy <kaber@...sh.net> wrote:
> 
>>Eric W. Biederman wrote:
>>
>>>A really good fix would be to remove the binary side and then to
>>>modify brnf_sysctl_call_tables to allocate a temporary ctl_table and
>>>integer on the stack and only set ctl->data after we have normalized
>>>the written value.  But since in practice nothing cares about
>>>the race a better fix probably isn't worth it.
>>
>>
>>I seem to be missing something, the entire brnf_sysctl_call_tables
>>thing looks purely cosmetic to me, wouldn't it be better to simply
>>remove it?
> 
> 
> I agree, removing seems like a better option.  But probably need to go
> through a 3-6mo warning period, since sysctl's are technically an API.

I meant removing brnf_sysctl_call_tables function, not the sysctls
themselves, all it does is change values != 0 to 1. Or did you
actually mean that something in userspace might depend on reading
back the value 1 after writing a value != 0?
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