Date: Mon, 8 Jan 2018 17:31:44 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Thomas Deutschmann <whissi@gentoo.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: Linux 4.9.75
Message-ID: <20180108163144.GB26214@kroah.com>
References: <20180105145537.GA12474@kroah.com>
 <446fd2cf-14d9-44f2-6603-e7dd08e82b4c@gentoo.org>
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On Fri, Jan 05, 2018 at 05:09:25PM +0100, Thomas Deutschmann wrote:
> Hi Greg,
> 
> sorry, I lost the overview -- the KPTI 4.14, 4.9 and 4.4 patch set is
> diverging...

4.14 follows Linus's tree almost identically.

4.4 and 4.9 should be identical as well, they come from the work of Hugh
from Google and lots of cleanups on top of that from the SUSE
developers.

> I am missing patches like
> 
>   x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat()
>   x86/pti: Make sure the user/kernel PTEs match
> 
> in 4.9.

What are those git commit ids?  And are they really relevant for 4.9?

> The first one was really important but the problem might be hidden now
> due to
> 
>   x86/cpu, x86/pti: Do not enable PTI on AMD processors

So have you tested the backports?  Can you provide a copy of them?

thanks,

greg k-h