[PATCH] net: Unbreak compat_sys_{send,recv}msg

[Eric Dumazet]

On Thu, 2013-06-06 at 00:26 -0700, David Miller wrote:
> From: Andy Lutomirski <luto at amacapital.net>
> Date: Wed,  5 Jun 2013 22:38:26 -0700
> 
> > I broke them in this commit:
> > 
> >     commit 1be374a0518a288147c6a7398792583200a67261
> >     Author: Andy Lutomirski <luto at amacapital.net>
> >     Date:   Wed May 22 14:07:44 2013 -0700
> > 
> >         net: Block MSG_CMSG_COMPAT in send(m)msg and recv(m)msg
> > 
> > This patch adds __sys_sendmsg and __sys_sendmsg as common helpers that accept
> > MSG_CMSG_COMPAT and blocks MSG_CMSG_COMPAT at the syscall entrypoints.  It
> > also reverts some unnecessary checks in sys_socketcall.
> > 
> > Apparently I was suffering from underscore blindness the first time around.
> > 
> > Signed-off-by: Andy Lutomirski <luto at amacapital.net>
> 
> Eric, can you test this patch too?

Yes, this fixes the problem as well on x86_64

Tested-by: Eric Dumazet <edumazet at google.com>

Thanks !

PS: I had following fuzz while applying on Linus tree :

patching file include/linux/socket.h
Hunk #1 succeeded at 320 (offset -1 lines).
patching file net/compat.c
patching file net/socket.c
Hunk #1 succeeded at 1956 (offset -22 lines).
Hunk #2 succeeded at 2071 (offset -22 lines).
Hunk #3 succeeded at 2125 (offset -22 lines).
Hunk #4 succeeded at 2163 (offset -22 lines).
Hunk #5 succeeded at 2255 (offset -22 lines).
Hunk #6 succeeded at 2317 (offset -22 lines).
Hunk #7 succeeded at 2515 (offset -20 lines).