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Date: Wed, 17 Jan 2018 19:16:02 -0800
From: Linus Torvalds <>
To: Al Viro <>
Cc: Network Development <>, Dan Williams <>, 
	Linux Kernel Mailing List <>,, 
	Andi Kleen <>, Kees Cook <>,, 
	Greg Kroah-Hartman <>, "the arch/x86 maintainers" <>, 
	Ingo Molnar <>, "H. Peter Anvin" <>, Thomas Gleixner <>, 
	Andrew Morton <>, Alan Cox <>, 
	David Miller <>
Subject: Re: [RFC][PATCH] get rid of the use of set_fs() (by way of
 kernel_recvmsg()) in sunrpc

On Wed, Jan 17, 2018 at 7:06 PM, Al Viro <> wrote:
> Similar to the way put_cmsg() handles 32bit case on biarch
> targets, introduce a flag telling put_cmsg() to treat
> ->msg_control as kernel pointer, using memcpy instead of
> copy_to_user().  That allows to avoid the use of kernel_recvmsg()
> with its set_fs().

If this is the only case that kernel_recvmsg() exists for, then by all
means, that patch certainly looks like a good thing.


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