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

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Message-ID: <20120416075831.GA9920@redhat.com>
Date:	Mon, 16 Apr 2012 10:58:31 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	netdev@...r.kernel.org, xma@...ibm.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: [PATCH 3/6] macvtap: zerocopy: validate vector length before
 pinning user pages

On Mon, Apr 16, 2012 at 02:08:07PM +0800, Jason Wang wrote:
> Currently we do not validate the vector length before calling
> get_user_pages_fast(), host stack would be easily overflowed by
> malicious guest driver who give us a descriptor with length greater
> than MAX_SKB_FRAGS. Solve this problem by checking the free entries
> before trying to pin user pages.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

We could handle this by copying and linearising some fragments.
That would be better.

> ---
>  drivers/net/macvtap.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 7cb2684..d197a78 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -529,6 +529,8 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
>  		}
>  		base = (unsigned long)from->iov_base + offset;
>  		size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
> +		if (i + size >= MAX_SKB_FRAGS)
> +			return -EFAULT;
>  		num_pages = get_user_pages_fast(base, size, 0, &page[i]);
>  		if ((num_pages != size) ||
>  		    (num_pages > MAX_SKB_FRAGS - skb_shinfo(skb)->nr_frags))
--
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