linux-kernel - Re: [PATCH 12/12] Add option to automatically set trusted

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Message-ID: <20150422113654.GA12986@mwanda>
Date:	Wed, 22 Apr 2015 14:36:54 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	linux-security-module@...r.kernel.org, james.l.morris@...cle.com,
	serge@...lyn.com, linux-kernel@...r.kernel.org,
	keescook@...omium.org, hpa@...or.com, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH 12/12] Add option to automatically set trusted_kernel
 when in Secure Boot mode

On Fri, Mar 13, 2015 at 11:38:28AM -1000, Matthew Garrett wrote:
> UEFI Secure Boot provides a mechanism for ensuring that the firmware will
> only load signed bootloaders and kernels. Certain use cases may also
> require that the kernel prevent userspace from inserting untrusted kernel
> code at runtime. Add a configuration option that enforces this automatically
> when enabled.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> ---
>  Documentation/x86/zero-page.txt       |  2 ++
>  arch/x86/Kconfig                      | 13 +++++++++++++
>  arch/x86/boot/compressed/eboot.c      | 33 +++++++++++++++++++++++++++++++++
>  arch/x86/include/uapi/asm/bootparam.h |  3 ++-
>  arch/x86/kernel/setup.c               |  6 ++++++
>  5 files changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/x86/zero-page.txt b/Documentation/x86/zero-page.txt
> index 82fbdbc..a811210 100644
> --- a/Documentation/x86/zero-page.txt
> +++ b/Documentation/x86/zero-page.txt
> @@ -30,6 +30,8 @@ Offset	Proto	Name		Meaning
>  1E9/001	ALL	eddbuf_entries	Number of entries in eddbuf (below)
>  1EA/001	ALL	edd_mbr_sig_buf_entries	Number of entries in edd_mbr_sig_buffer
>  				(below)
> +1EB/001	ALL     kbd_status      Numlock is enabled

This line looks like it was included by mistake?

> +1EC/001	ALL     secure_boot	Secure boot is enabled in the firmware

regards,
dan carpenter

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