netdev - Re: [PATCH] Integer overflow in RDS cmsg handling

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Message-Id: <20101117.095227.226775367.davem@davemloft.net>
Date:	Wed, 17 Nov 2010 09:52:27 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	drosenberg@...curity.com
Cc:	andy.grover@...cle.com, netdev@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] Integer overflow in RDS cmsg handling

From: Dan Rosenberg <drosenberg@...curity.com>
Date: Wed, 17 Nov 2010 11:37:16 -0500

> In rds_cmsg_rdma_args(), the user-provided args->nr_local value is
> restricted to less than UINT_MAX.  This seems to need a tighter upper
> bound, since the calculation of total iov_size can overflow, resulting
> in a small sock_kmalloc() allocation.  This would probably just result
> in walking off the heap and crashing when calling rds_rdma_pages() with
> a high count value.  If it somehow doesn't crash here, then memory
> corruption could occur soon after.
> 
> Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>

Applied, thanks Dan.
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