Subject: Re: [PATCH 15/17] switch kernel_sendmsg() and kernel_recvmsg() to iov_iter_kvec()

From: Al Viro <[email-masked]>
Date: Tue, 14 Apr 2015 17:34:03 +0100

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.