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Date: Wed, 3 Feb 2010 14:45:59 +0100
From: Marcus Meissner <meissner@...e.de>
To: OSS Security List <oss-security@...ts.openwall.com>
Subject: CVE request: kernel OOM/crash in drivers/connector

Hi,

Sebastian Krahmer found a problem in the drivers/connector/connector.c code
where users could send/allocate arbitrary amounts of NETLINK_CONNECTOR
messages to the kernel, causing OOM condition, killing selected processes
or halting the system.

This is fixed in mainline commit f98bfbd78c37c5946cc53089da32a5f741efdeb7
by removing the code.

commit f98bfbd78c37c5946cc53089da32a5f741efdeb7
Author: Evgeniy Polyakov <zbr@...emap.net>
Date:   Tue Feb 2 15:58:48 2010 -0800

    connector: Delete buggy notification code.

    On Tue, Feb 02, 2010 at 02:57:14PM -0800, Greg KH (gregkh@...e.de) wrote:
    > > There are at least two ways to fix it: using a big cannon and a small
    > > one. The former way is to disable notification registration, since it is
    > > not used by anyone at all. Second way is to check whether calling
    > > process is root and its destination group is -1 (kind of priveledged
    > > one) before command is dispatched to workqueue.
    >
    > Well if no one is using it, removing it makes the most sense, right?
    >
    > No objection from me, care to make up a patch either way for this?

    Getting it is not used, let's drop support for notifications about
    (un)registered events from connector.
    Another option was to check credentials on receiving, but we can always
    restore it without bugs if needed, but genetlink has a wider code base
    and none complained, that userspace can not get notification when some
    other clients were (un)registered.

    Kudos for Sebastian Krahmer <krahmer@...e.de>, who found a bug in the
    code.

    Signed-off-by: Evgeniy Polyakov <zbr@...emap.net>
    Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
    Signed-off-by: David S. Miller <davem@...emloft.net>

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