linux-kernel - Re: Avoid speculative indirect calls in kernel

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Message-ID: <alpine.DEB.2.20.1801040125440.1957@nanos>
Date:   Thu, 4 Jan 2018 01:26:48 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Andi Kleen <andi@...stfloor.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        dwmw@...zon.co.uk, Tim Chen <tim.c.chen@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: Avoid speculative indirect calls in kernel

On Wed, 3 Jan 2018, Linus Torvalds wrote:
> On Wed, Jan 3, 2018 at 4:12 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > It should be a CPU_BUG bit as we have for the other mess. And that can be
> > used for patching.
> 
> That would definitely be the right approach.
> 
> However, that's also probably quite challenging for the gcc option.

AFAICT, the thunk which GCC injects can be supplied to GCC, so it should be
doable.

Thanks,

	tglx