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

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Message-ID: <72742ccd-febe-7421-dcd1-595959de42e4@infradead.org>
Date:   Wed, 24 Jan 2018 11:21:33 -0800
From:   Randy Dunlap <rdunlap@...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>,
        David Woodhouse <dwmw@...zon.co.uk>,
        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 01/24/2018 10:17 AM, Andi Kleen wrote:

> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index e4dc26185aa7..9064b20473a7 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -93,6 +93,18 @@ static const char *spectre_v2_strings[] = {
>  
>  static enum spectre_v2_mitigation spectre_v2_enabled = SPECTRE_V2_NONE;
>  
> +/* A module has been loaded. Disable reporting that we're good. */
> +void disable_retpoline(void)
> +{
> +	spectre_v2_enabled = SPECTRE_V2_NONE;
> +	pr_err("system may be vunerable to spectre\n");

	                      vulnerable

> +}


-- 
~Randy