linux-kernel - Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation

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Date:   Tue, 23 Jan 2018 15:21:25 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.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>,
        gnomes@...rguk.ukuu.org.uk, x86@...nel.org,
        thomas.lendacky@....com, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select
 Spectre v2 mitigation

> Distros have always been in the situation "we let the external modules to 
> load, as it'll work when it comes to functionality, but then it's our 
> duty/responsibility to explain to 3rd parties that they *really* should 
> recompile". Mostly because of security fixes to static inlines, but not 
> only that.

You can use my previous patch which merely warns:

https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/log/?h=spec/retpoline-module-2

-Andi