linux-kernel - Re: [PATCH] Revert "module: Add retpoline tag to VERMAGIC"

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Date:   Wed, 24 Jan 2018 19:31:22 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Andi Kleen <ak@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rusty Russell <rusty@...tcorp.com.au>,
        "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
        Jessica Yu <jeyu@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "module: Add retpoline tag to VERMAGIC"

On Wed, 2018-01-24 at 10:17 -0800, Andi Kleen wrote:
> +/* A module has been loaded. Disable reporting that we're good. */
> +void disable_retpoline(void)
> +{
> +       spectre_v2_enabled = SPECTRE_V2_NONE;

That wants to be one of the 'MINIMAL' variants.

> +       pr_err("system may be vunerable to spectre\n");
> +}
> +
> +bool retpoline_enabled(void)
> +{
> +       return spectre_v2_enabled != SPECTRE_V2_NONE;

How about checking for X86_FEATURE_RETPOLINE?

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