From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH 15/17] switch kernel_sendmsg() and kernel_recvmsg() to
 iov_iter_kvec()
Date: Tue, 14 Apr 2015 17:34:03 +0100
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To: David Laight <David.Laight@ACULAB.COM>
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On Tue, Apr 14, 2015 at 04:21:02PM +0000, David Laight wrote:

> Massive NAK.
> This breaks any code that is using msg_control to set SCTP parameters
> when sending data.

	Huh?  ->sendmsg() expects ->msg_control already in kernel space;
it's ->recvmsg() that plays silly buggers with userland pointers there.