netdev - Re: [Bugme-new] [Bug 14546] New: Off-by-two stack buffer overflow in function rpc

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Date:	Wed, 11 Nov 2009 09:51:28 +0200
From:	Patroklos Argyroudis <argp@...sus-labs.com>
To:	Chuck Lever <chuck.lever@...cle.com>
Cc:	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Linux Network Developers <netdev@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Neil Brown <neilb@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux NFS Mailing list <linux-nfs@...r.kernel.org>
Subject: Re: [Bugme-new] [Bug 14546] New: Off-by-two stack buffer overflow
 in function rpc_uaddr2sockaddr() of net/sunrpc/addr.c

On Nov 10, 2009, at 6:29 PM, Andrew Morton wrote:
> >
> >Please don't submit patches via bugzilla.
> >
> >Please prepare this patch as per Documentation/SubmittingPatches and
> >email it to all the recipients of this email, thanks.

Ok, I will do so.

On Tue, Nov 10, 2009 at 06:38:05PM -0500, Chuck Lever wrote:
> Why wouldn't you bump the size of the buffer by two as well?
> Otherwise valid universal addresses that are RPCBIND_MAXUADDRLEN
> bytes long will fail here.
> 
> >	memcpy(buf, uaddr, uaddr_len);

There is no need to increase the size of the buffer since the new check
(if (uaddr_len > sizeof(buf) - 2)) will terminate the function in case
the valid universal address is RPCBIND_MAXUADDRLEN bytes.

Cheers,
Patroklos
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