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

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Message-ID: <20180116223421.ntjryg32aaxrhffl@two.firstfloor.org>
Date:   Tue, 16 Jan 2018 14:34:21 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <andi@...stfloor.org>, 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, 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?

-Andi