linux-kernel - Re: [ 150/184] ipv4: check rt_genid in dst

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Message-ID: <20130607150352.GS15183@kvack.org>
Date:	Fri, 7 Jun 2013 11:04:28 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Willy Tarreau <w@....eu>
Cc:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Timo Teräs <timo.teras@....fi>
Subject: Re: [ 150/184] ipv4: check rt_genid in dst_check

Hi Willy,

On Fri, Jun 07, 2013 at 05:00:57PM +0200, Willy Tarreau wrote:
> On Fri, Jun 07, 2013 at 10:58:06AM -0400, Benjamin LaHaise wrote:
> > On Fri, Jun 07, 2013 at 07:07:33AM +0100, Ben Hutchings wrote:
> > > > This commit is based on the above, with the addition of verifying blackhole
> > > > routes in the same manner.
> > > 
> > > That addition doesn't seem to correspond to anything in mainline.  Why
> > > should 2.6.32 differ?
> > 
> > Fixing the issue with blackhole routes as it was accomplished in mainline 
> > would require pulling in a lot more code, and people were not interested 
> > in pulling in all of the dependencies given the much higher risk of trying 
> > to select the right subset of changes to include.  The addition of the 
> > single line of "dst->obsolete = -1;" in ipv4_dst_blackhole() was much 
> > easier to verify, and is in the spirit of the patch in question.  This is 
> > the minimal set of changes to fix the bug in question.
> 
> Thank you Ben, I'll add this description to the existing commit message.

A link to the test case for this issue might be helpful to include as well.  
It is at http://marc.info/?l=linux-netdev&m=135015076708950&w=2 .  Cheers,

		-ben

> Best regards,
> Willy

-- 
"Thought is the essence of where you are now."
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