linux-kernel - Re: RFC: default to spec_store_bypass_disable=prctl spectre_v2

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Date:   Wed, 4 Nov 2020 18:40:47 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        YiFei Zhu <zhuyifei1999@...il.com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        YiFei Zhu <yifeifz2@...inois.edu>, bpf <bpf@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Aleksa Sarai <cyphar@...har.com>,
        Andy Lutomirski <luto@...capital.net>,
        David Laight <David.Laight@...lab.com>,
        Dimitrios Skarlatos <dskarlat@...cmu.edu>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Hubertus Franke <frankeh@...ibm.com>,
        Jack Chen <jianyan2@...inois.edu>,
        Jann Horn <jannh@...gle.com>,
        Josep Torrellas <torrella@...inois.edu>,
        Tianyin Xu <tyxu@...inois.edu>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Tycho Andersen <tycho@...ho.pizza>,
        Valentin Rothberg <vrothber@...hat.com>,
        Will Drewry <wad@...omium.org>, Jiri Kosina <jikos@...nel.org>,
        Waiman Long <longman@...hat.com>
Subject: Re: RFC: default to spec_store_bypass_disable=prctl
 spectre_v2_user=prctl

On Thu, Nov 05, 2020 at 12:22:29AM +0100, Thomas Gleixner wrote:
> On Wed, Nov 04 2020 at 16:57, Andrea Arcangeli wrote:
> > ---
> >  Documentation/admin-guide/kernel-parameters.txt | 5 ++---
> 
> Is Documentation/admin-guide/hw-vuln/* still correct? If not, please
> fix that as well.

Right, I missed two seccomp mention that needed removing there too.

Also I noticed below I intended PR_SPEC_INDIRECT_BRANCH
(PR_SPEC_STORE_BYPASS there is no point to even mention it as a
possibility to be considered), so I corrected it.

==
uses no JIT. If sshd prefers to keep doing the STIBP window dressing
exercise, it still can even after this change of defaults by opting-in
with PR_SPEC_STORE_BYPASS.
==

> > >with PR_SPEC_INDIRECT_BRANCH.

> Aside of that please send patches in the proper format so they do not
> need manual interaction when picking them up.

This was a RFC per subject since I expected it wouldn't be final, but
I added Kees' Acked-by and I'll submit it now.

Thanks,
Andrea