netdev - Re: [PATCH 5/5] net: Block MSG_CMSG_COMPAT in send(m)msg and recv(m)msg

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Date:	Wed, 05 Jun 2013 21:35:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michael Neuling <mikey@...ling.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	trinity@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linux PPC dev <linuxppc-dev@...abs.org>,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 5/5] net: Block MSG_CMSG_COMPAT in send(m)msg and
 recv(m)msg

On Thu, 2013-06-06 at 12:56 +1000, Michael Neuling wrote:
> On Thu, May 23, 2013 at 7:07 AM, Andy Lutomirski <luto@...capital.net> wrote:
> > MSG_CMSG_COMPAT is (AFAIK) not intended to be part of the API --
> > it's a hack that steals a bit to indicate to other networking code
> > that a compat entry was used.  So don't allow it from a non-compat
> > syscall.
> 
> Dave & Linus
> 
> This is causing a regression on 64bit powerpc with 32bit usermode.
> When I hit userspace, udev is broken and I suspect all networking is
> broken as well.
> 
> Can we please revert 1be374a0518a288147c6a7398792583200a67261 upstream?
> 

It seems to also break x86_64, if using 32bit usermode.



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