netdev - Re: [patch] net: clamp ->msg_namelen instead of returning an error

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Date:	Wed, 27 Nov 2013 13:27:46 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Wong <normalperson@...t.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [patch] net: clamp ->msg_namelen instead of returning an error

On Wed, 2013-11-27 at 15:40 +0300, Dan Carpenter wrote:
> If kmsg->msg_namelen > sizeof(struct sockaddr_storage) then in the
> original code that would lead to memory corruption in the kernel if you
> had audit configured.  If you didn't have audit configured it was
> harmless.
> 
> There are some programs such as beta versions of Ruby which use too
> large of a buffer and returning an error code breaks them.  We should
> clamp the ->msg_namelen value instead.
> 
> Reported-by: Eric Wong <normalperson@...t.net>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Fixes: 1661bf364ae9 ("net: heap overflow in __audit_sockaddr()")

Acked-by: Eric Dumazet <edumazet@...gle.com>


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