netdev - Re: [PATCH stable <= 3.18] net: add length argument to skb_copy_and_csum_datagram

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Message-ID: <20151029100021.GA17588@bistromath.redhat.com>
Date:	Thu, 29 Oct 2015 11:00:21 +0100
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	netdev@...r.kernel.org
Cc:	herbert@...dor.apana.org.au, stable@...r.kernel.org,
	hannes@...essinduktion.org
Subject: Re: [PATCH stable <= 3.18] net: add length argument to
 skb_copy_and_csum_datagram_iovec

2015-10-15, 14:25:03 +0200, Sabrina Dubroca wrote:
> Without this length argument, we can read past the end of the iovec in
> memcpy_toiovec because we have no way of knowing the total length of the
> iovec's buffers.
> 
> This is needed for stable kernels where 89c22d8c3b27 ("net: Fix skb
> csum races when peeking") has been backported but that don't have the
> ioviter conversion, which is almost all the stable trees <= 3.18.
> 
> This also fixes a kernel crash for NFS servers when the client uses
>  -onfsvers=3,proto=udp to mount the export.
> 
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> Reviewed-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Fixes CVE-2015-8019.
http://www.openwall.com/lists/oss-security/2015/10/29/1

-- 
Sabrina
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