linux-kernel - Re: [PATCH 1/4] inet: Add skb_copy_datagram

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Message-Id: <20141110.002020.1062493586889118565.davem@davemloft.net>
Date:	Mon, 10 Nov 2014 00:20:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	viro@...IV.linux.org.uk
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bcrl@...ck.org, mst@...hat.com
Subject: Re: [PATCH 1/4] inet: Add skb_copy_datagram_iter

From: Al Viro <viro@...IV.linux.org.uk>
Date: Sun, 9 Nov 2014 21:19:08 +0000

> 1) does sparc64 access_ok() need to differ for 32bit and 64bit tasks?

sparc64 will just fault no matter what kind of task it is.

It is impossible for a user task to generate a reference to
a kernel virtual address, as kernel and user accesses each
go via a separate address space identifier.
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