netdev - Fixing CVE-2017-16939 in v4.4.y and possibly v3.18.y

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Message-ID: <20171130183740.GA20343@roeck-us.net>
Date:   Thu, 30 Nov 2017 10:37:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     netdev@...r.kernel.org
Cc:     stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Fixing CVE-2017-16939 in v4.4.y and possibly v3.18.y

Hi,

The fix for CVE-2017-16939 has been applied to v4.9.y, but not to v4.4.y
and older kernels. However, I confirmed that running the published POC
(see https://blogs.securiteam.com/index.php/archives/3535) does crash a 4.4
kernel.

I confirmed that the following two patches fix the problem in v4.4.y.
Please consider applying them to v4.4.y (and possibly v3.18.y).

fc9e50f5a5a4e ("netlink: add a start callback for starting a netlink dump")
1137b5e2529a8 ("ipsec: Fix aborted xfrm policy dump crash")

My apologies for the noise if this is already under consideration.

Thanks,
Guenter