linux-kernel - Re: [PATCH 01/16] Add the ability to lock down access to the running kernel image

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Message-ID: <20161116222049.hywdxse4hwsrfwjm@pd.tnic>
Date:   Wed, 16 Nov 2016 23:20:49 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     David Howells <dhowells@...hat.com>
Cc:     keyrings@...r.kernel.org, matthew.garrett@...ula.com,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/16] Add the ability to lock down access to the running
 kernel image

On Wed, Nov 16, 2016 at 09:47:24PM +0000, David Howells wrote:
> Provide a single call to allow kernel code to determine whether the system
> should be locked down, thereby disallowing various accesses that might
> allow the running kernel image to be changed including the loading of
> modules that aren't validly signed with a key we recognise, fiddling with
> MSR registers and disallowing hibernation,
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---

...

> +/**
> + * kernel_is_locked_down - Find out if the kernel is locked down
> + */
> +bool kernel_is_locked_down(void)
> +{
> +	return kernel_locked_down;
> +}
> +EXPORT_SYMBOL(kernel_locked_down);

Surely

EXPORT_SYMBOL(kernel_is_locked_down);

-- 
Regards/Gruss,
    Boris.

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