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

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Message-ID: <20180117051120.GA28006@kroah.com>
Date:   Wed, 17 Jan 2018 06:11:20 +0100
From:   Greg KH <gregkh@...ux-foundation.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     tglx@...utronix.de, torvalds@...ux-foundation.org,
        dwmw@...zon.co.uk, linux-kernel@...r.kernel.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 12:52:28PM -0800, 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>


Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>