linux-kernel - Re: [PATCH 09/27] hibernate: Disable when the kernel is locked down

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Message-ID: <20190319221501.GA31551@amd>
Date:   Tue, 19 Mar 2019 23:15:01 +0100
From:   Pavel Machek <pavel@....cz>
To:     Matthew Garrett <matthewgarrett@...gle.com>
Cc:     jmorris@...ei.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: Re: [PATCH 09/27] hibernate: Disable when the kernel is locked down

On Thu 2019-02-28 15:11:45, Matthew Garrett wrote:
> From: Josh Boyer <jwboyer@...oraproject.org>
> 
> There is currently no way to verify the resume image when returning
> from hibernate.  This might compromise the signed modules trust model,
> so until we can work with signed hibernate images we disable it when the
> kernel is locked down.
> 
> Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
> Signed-off-by: David Howells <dhowells@...hat.com>
> Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com>
> cc: linux-pm@...r.kernel.org

It would be good to cc hibernation maintainers here.

> ---
>  kernel/power/hibernate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
> index abef759de7c8..802795becb88 100644
> --- a/kernel/power/hibernate.c
> +++ b/kernel/power/hibernate.c
> @@ -70,7 +70,7 @@ static const struct platform_hibernation_ops *hibernation_ops;
>  
>  bool hibernation_available(void)
>  {
> -	return (nohibernate == 0);
> +	return nohibernate == 0 && !kernel_is_locked_down("Hibernation");
>  }
>  
>  /**

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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