linux-kernel - Re: [PATCH v6 00/10] Retpoline: Avoid speculative indirect calls in kernel

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Date:   Mon, 8 Jan 2018 22:10:49 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v6 00/10] Retpoline: Avoid speculative indirect calls in
 kernel

On Mon, 8 Jan 2018, Ingo Molnar wrote:
> * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > On Sun, Jan 7, 2018 at 2:11 PM, David Woodhouse <dwmw@...zon.co.uk> wrote:
> > > This is a mitigation for the 'variant 2' attack described in
> > > https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html
> > 
> > Ok, I don't love the patches, but I see nothing horribly wrong here
> > either, and I assume the performance impact of this is pretty minimal.
> > 
> > Thomas? I'm obviously doing rc7 today without these, but I assume the
> > x86 maintainers are resigned to this all. And yes, we'll have at least
> > an rc8 this release..
> 
> I'm definitely resigned to them, and with these patches being disclosed so late
> we don't have any good choices left, so a tentative:
> 
> Acked-by: Ingo Molnar <mingo@...nel.org>

Just doing the last polishing on that. I'll add your ack