netdev - Re: [RFC] Kernel unaligned access at __skb_flow

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Message-ID: <1454097696.7627.68.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 29 Jan 2016 12:01:36 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC] Kernel unaligned access at __skb_flow_dissect

On Fri, 2016-01-29 at 14:44 -0500, Sowmini Varadhan wrote:
> On (01/29/16 11:37), Eric Dumazet wrote:
> > 
> > I have no idea why reading iph->saddr or iph->daddr would not hit the
> > problem, but accessing the 32bit ipv6 flow label would be an issue.
> > 
> > Something is fishy.
> 
> I was wondering about this myself. Even on sparc, I only first
> ran into the errors for ipv6. I dont know if the fact that the
> saddr is memcpy'ed masks the error (even though the problem
> is still there). 

Oh right, recent work in flow dissector added all these memcpy()

I was still looking at linux-4.3 ;)