linux-kernel - Re: [RFC] Retpoline: Binary mitigation for branch-target-injection (aka "Spectre")

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Date:   Thu, 04 Jan 2018 16:24:38 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>,
        "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "tglx@...uxtronix.de" <tglx@...uxtronix.de>,
        "riel@...hat.com" <riel@...hat.com>,
        "keescook@...gle.com" <keescook@...gle.com>,
        "gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
        "pjt@...gle.com" <pjt@...gle.com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "jikos@...nel.org" <jikos@...nel.org>,
        "gregkh@...ux-foundation.org" <gregkh@...ux-foundation.org>
Subject: Re: [RFC] Retpoline: Binary mitigation for branch-target-injection
 (aka "Spectre")

On Thu, 2018-01-04 at 08:18 -0800, Andy Lutomirski wrote:
> I hate to say this, but I think Intel should postpone CET until the
> dust settles.

CET isn't a *problem* for retpoline. We've had a CET-compatible version
for a while now, and I posted it earlier. It's just that Andi was
working from an older version of my patches.

Of course, there's a school of thought that says that Intel should
postpone *everything* until this is all fixed sanely, but there's
nothing special about CET in that respect.
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