linux-kernel - Re: [PATCH v3] retpoline: Add retpoline tag to VERMAGIC

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Message-ID: <alpine.DEB.2.20.1801170837450.2366@nanos>
Date:   Wed, 17 Jan 2018 08:38:17 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     torvalds@...ux-foundation.org, dwmw@...zon.co.uk,
        linux-kernel@...r.kernel.org, gregkh@...ux-foundation.org,
        arjan.van.de.ven@...el.com, jeyu@...nel.org, rusty@...tcorp.com.au,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3] retpoline: Add retpoline tag to VERMAGIC

On Tue, 16 Jan 2018, Andi Kleen wrote:

> On Tue, Jan 16, 2018 at 10:24:53PM +0100, Thomas Gleixner wrote:
> > On Tue, 16 Jan 2018, Andi Kleen wrote:
> > 
> > > From: Andi Kleen <ak@...ux.intel.com>
> > > 
> > > Add a marker for retpoline to the module VERMAGIC. This catches
> > > the case when a non RETPOLINE compiled module gets loaded into
> > > a retpoline kernel, making it insecure.
> > > 
> > > It doesn't handle the case when retpoline has been runtime disabled.
> > > Even in this case the match of the retcompile status will be enforced.
> > > This implies that even with retpoline run time disabled all modules
> > > loaded need to be recompiled.
> > > 
> > > This supersedes an earlier patch that did the same checking using
> > > a new module tag (so it's really a v3)
> > > 
> > > Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> > 
> > Acked-by: Thomas Gleixner <tglx@...utronix.de>
> 
> Thanks. Through which tree should this go?
> Or Linus, could you take it directly?

I can route it through x86/pti where I have still stuff to send linuswards.

Thanks,

	tglx