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Date: Fri, 24 Jul 2015 23:12:48 -0700
From: Andy Lutomirski <>
To: Josh Boyer <>
Cc: oss security list <>
Subject: Re: Linux x86_64 NMI security issues

On 07/24/2015 07:16 AM, Josh Boyer wrote:
> On Wed, Jul 22, 2015 at 2:12 PM, Andy Lutomirski <> wrote:
>> Note: Several of these fixes each depend on a few patches immediately
>> before them.  The NMI stack switching fix also depends on changes made
>> in 4.2 and will appear to apply but crash on older kernels.  I have a
>> different variant that's more portable.
> Given that none of these are going to apply cleanly on older kernels,
> do you have backports available for 4.1.y and the longterm stable
> kernels?

There's this:

which is a combined effort of me and Ben Hutchings.  It's not synced up
to the fixes in Linus' tree.

Note that even Linus' tree doesn't have the synchronous modify_ldt fix
yet.  I sent a hopefully final version of that out a few minutes ago.


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