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

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Message-ID: <20141107223153.GC7996@ZenIV.linux.org.uk>
Date:	Fri, 7 Nov 2014 22:31:53 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Miller <davem@...hat.com>
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bcrl@...ck.org
Subject: Re: [PATCH 1/4] inet: Add skb_copy_datagram_iter

On Fri, Nov 07, 2014 at 10:11:14PM +0000, Al Viro wrote:

> I'm looking through the tree right now; so far it looks like we can just
> move those suckers to the point where we validate iovec and lose them
> from low-level iovec and csum copying completely.  I still haven't finished
> tracing all possible paths for address to arrive at the points where we
> currently check that stuff, but so far it looks very doable.

BTW, csum side of that is also chock-full of duplicate access_ok() -
e.g. generic csum_and_copy_from_user() checks before calling
csum_partial_copy_from_user().  And generic instance of that is using
__copy_from_user(), all right, but a _lot_ of non-default instances
repeat that access_ok().
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