linux-kernel - Re: [PATCH] RDS: fix race condition when sending a message on unbound socket.

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Message-ID: <5638E072.2090104@oracle.com>
Date:	Tue, 3 Nov 2015 08:27:30 -0800
From:	santosh shilimkar <santosh.shilimkar@...cle.com>
To:	Quentin Casasnovas <quentin.casasnovas@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Chien Yen <chien.yen@...cle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] RDS: fix race condition when sending a message on unbound
 socket.

On 11/3/2015 3:25 AM, Quentin Casasnovas wrote:
> On Fri, Oct 16, 2015 at 10:47:49AM -0700, santosh shilimkar wrote:
>> On 10/16/2015 8:11 AM, Quentin Casasnovas wrote:
>>> Sasha's found a NULL pointer dereference in the RDS connection code when
>>> sending a message to an apparently unbound socket.  The problem is caused
>>> by the code checking if the socket is bound in rds_sendmsg(), which checks
>>> the rs_bound_addr field without taking a lock on the socket.  This opens a
>>> race where rs_bound_addr is temporarily set but where the transport is not
>>> in rds_bind(), leading to a NULL pointer dereference when trying to
>>> dereference 'trans' in __rds_conn_create().
>>>
>>> Vegard wrote a reproducer for this issue, so kindly ask him to share if
>>> you're interested.
>>>
>>> I cannot reproduce the NULL pointer dereference using Vegard's reproducer
>>> with this patch, whereas I could without.
>>>
>>> Complete earlier incomplete fix to CVE-2015-6937:
>>>
>>>     74e98eb08588 ("RDS: verify the underlying transport exists before creating a connection")
>>>
>
> For reference, this has been assigned CVE-2015-7990 on the oss-sec thread:
>
>    http://seclists.org/oss-sec/2015/q4/179
>
New CVE number than the older one. Thanks for the note.

Regards,
Santosh
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