linux-kernel - Re: [PATCH] net: sock: validate data_len before allocating skb in sock_alloc_send

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Message-ID: <4FC71306.50806@redhat.com>
Date:	Thu, 31 May 2012 14:43:18 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] net: sock: validate data_len before allocating skb in
 sock_alloc_send_pskb()

On 05/31/2012 02:20 PM, Eric Dumazet wrote:
> On Thu, 2012-05-31 at 14:11 +0800, Jason Wang wrote:
>
>> Not affected, only code duplication. It's no harm the check the data_len
>> again for packet sockets, so better to unify the code and fix the issue
>> in one place?
> As a matter of fact, we currently allocate order-0 pages, but it could
> be nice trying to use order-1 or order-2 pages, on arches where
> PAGE_SIZE is so small (4096 bytes)
>
> So lets do this test in sock_alloc_send_pskb() to allow future changes.
>
> af_unix is kind of special, because it tries to lower risk of high order
> linear allocation failures. And for small sizes, it wants linear skbs to
> have no performance regression (prior kernels were allocating linear
> skbs)
>

Thanks for the clarification, would post V2.
>
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