linux-kernel - RE: [PATCH v5 1/2] x86/speculation: apply IBPB more strictly to avoid cross-process data leak

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Message-ID: <alpine.DEB.2.21.1809121401080.9957@nanos.tec.linutronix.de>
Date:   Wed, 12 Sep 2018 14:01:27 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Schaufler, Casey" <casey.schaufler@...el.com>
cc:     Jiri Kosina <jikos@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: RE: [PATCH v5 1/2] x86/speculation: apply IBPB more strictly to
 avoid cross-process data leak

On Tue, 11 Sep 2018, Schaufler, Casey wrote:
> How about this? Take Jiri's patch as written. You get everything except checks
> on the security blobs and any "magic" that my safesidechannel module did. I
> will propose a follow on patch that fixes the SELinux code to eliminate the locking
> issue and enables the LSM hooks in the IBPB case. I can then do a revised "magic"
> safesidechannel security module that uses the ptrace hook instead of adding a
> new hook explicitly for IBPB. There is some danger that in the future ptrace and
> IBPB criteria will diverge sufficiently that a common hook becomes nonsensical.
> As no one else seems concerned about this possibility, I won't lose any sleep over
> it either.

Sounds like a plan.