netdev - Re: [PATCH net-2.6] L2TP: Fix potential memory corruption in pppol2tp

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Message-Id: <20080610.123612.162337098.davem@davemloft.net>
Date:	Tue, 10 Jun 2008 12:36:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jchapman@...alix.com
Cc:	netdev@...r.kernel.org, ilja@...ric.org
Subject: Re: [PATCH net-2.6] L2TP: Fix potential memory corruption in
 pppol2tp_recvmsg()

From: James Chapman <jchapman@...alix.com>
Date: Tue, 10 Jun 2008 13:34:24 +0100

> This patch fixes a potential memory corruption in
> pppol2tp_recvmsg(). If skb->len is bigger than the caller's buffer
> length, memcpy_toiovec() will go into unintialized data on the kernel
> heap, interpret it as an iovec and start modifying memory.
> 
> The fix is to change the memcpy_toiovec() call to
> skb_copy_datagram_iovec() so that paged packets (rare for PPPOL2TP)
> are handled properly. Also check that the caller's buffer is big
> enough for the data and set the MSG_TRUNC flag if it is not so.
> 
> Reported-by: Ilja <ilja@...ric.org>
> Signed-off-by: James Chapman <jchapman@...alix.com>

Applied, thanks.

Please see:

http://marc.info/?l=linux-netdev&m=121262022428660&w=2

for a description of how I would like folks to format their
commit header lines for networking changes nowadays.  I fixed
it up by hand for you this time.

> A candidate for -stable?

Yes, and I've queued it up for such.
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