linux-kernel - Re: STIBP by default.. Revert?

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Message-Id: <30141361-EFDC-4547-82D7-7AAAC556B9F5@sr71.net>
Date:   Sun, 18 Nov 2018 14:35:20 -0800
From:   Dave Hansen <dave@...1.net>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        stable@...r.kernel.org
Subject: Re: STIBP by default.. Revert?


> On Nov 18, 2018, at 2:17 PM, Jiri Kosina <jikos@...nel.org> wrote:
> 
> It's probably not just browsers, but anything running JITed sandboxed 
> code. So the most straightforward way might be the prctl() aproach, where 
> userspace would claim "I do care about this, please fix it up for me". So 
> prctl() + perhaps SECCOMP.

Yeah, the prctl() shifts the pain to the right place: folks explicitly opting in.  Always-on seemed way too draconian to me.