netdev - Re: [PATCH 3/6] macvtap: zerocopy: validate vector length before pinning user pages

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Message-ID: <1334640808.2472.6.camel@edumazet-glaptop>
Date:	Tue, 17 Apr 2012 07:33:28 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	netdev@...r.kernel.org, xma@...ibm.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org, mst@...hat.com, ebiederm@...ssion.com
Subject: Re: [PATCH 3/6] macvtap: zerocopy: validate vector length before
 pinning user pages

On Mon, 2012-04-16 at 16:21 +0800, Jason Wang wrote:
> Hi:
> On 04/16/2012 02:53 PM, Eric Dumazet wrote:
> 	if ((num_pages != size) ||
> >>   		    (num_pages>  MAX_SKB_FRAGS - skb_shinfo(skb)->nr_frags))
> >>
> > Hi Jason
> >
> > Why is -EFAULT the right error code ?
> 
> E2BIG or is there any error code you prefer?

Might be good yes.

However it sounds strange user cant write any size he wants (and kernel
needs to build several skbs to fulfill user request)



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