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

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Message-ID: <CA+55aFwxSu5ujsE7DANMs2QmEVXvN9u1d2hOmXAAqWrsN_FGeA@mail.gmail.com>
Date:   Sun, 7 Jan 2018 14:22:15 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     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>,
        Thomas Gleixner <tglx@...utronix.de>,
        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 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..

            Linus