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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 7 Jan 2018 14:22:15 -0800
Message-ID: <CA+55aFwxSu5ujsE7DANMs2QmEVXvN9u1d2hOmXAAqWrsN_FGeA@mail.gmail.com>
Subject: Re: [PATCH v6 00/10] Retpoline: Avoid speculative indirect calls in kernel
To: David Woodhouse <dwmw@amazon.co.uk>
Cc: Andi Kleen <ak@linux.intel.com>, Paul Turner <pjt@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kees Cook <keescook@google.com>,
        Rik van Riel <riel@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Jiri Kosina <jikos@kernel.org>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
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Sender: linux-kernel-owner@vger.kernel.org

On Sun, Jan 7, 2018 at 2:11 PM, David Woodhouse <dwmw@amazon.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..

            Linus