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

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Date:	Tue, 25 Sep 2007 09:12:03 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] Remove broken netfilter binary sysctls from bridging
 code

On Tue, 25 Sep 2007 06:07:24 +0200
Patrick McHardy <kaber@...sh.net> wrote:

> 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?

I was going farther, because don't really see the value of having
a sysctl for this. It seems better to just not load filters if
they aren't going to be used. Having another enable/disable hook
just adds needless complexity.
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