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Message-ID: <20190220081451.GA2254@light.dominikbrodowski.net>
Date: Wed, 20 Feb 2019 09:14:51 +0100
From: Dominik Brodowski <linux@...inikbrodowski.net>
To: Kees Cook <keescook@...omium.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com, x86@...nel.org
Subject: Re: [PATCH] x86/asm: Pin sensitive CR4 bits
On Tue, Feb 19, 2019 at 04:54:49PM -0800, Kees Cook wrote:
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index cb28e98a0659..7e0ea4470f8e 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -312,10 +312,16 @@ static __init int setup_disable_smep(char *arg)
> }
> __setup("nosmep", setup_disable_smep);
>
> +volatile unsigned long cr4_pin __ro_after_init;
> +EXPORT_SYMBOL_GPL(cr4_pin);
Where is this export needed?
Thanks,
Dominik
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