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List:       linux-security-module
Subject:    Re: [PATCH 08/18] Secure boot: Add new capability
From:       Pavel Machek <pavel () ucw ! cz>
Date:       2013-08-25 16:14:28
Message-ID: 20130825161428.GE5171 () amd ! pavel ! ucw ! cz
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On Thu 2013-08-22 19:01:47, Lee, Chun-Yi wrote:
> From: Matthew Garrett <mjg@redhat.com>
> 
> Secure boot adds certain policy requirements, including that root must not
> be able to do anything that could cause the kernel to execute arbitrary code.
> The simplest way to handle this would seem to be to add a new capability
> and gate various functionality on that. We'll then strip it from the initial
> capability set if required.

There was some discussion about this before, right? And I don't think
conclusion was it was acceptable...?

> Signed-off-by: Matthew Garrett <mjg@redhat.com>
> Acked-by: Lee, Chun-Yi <jlee@suse.com>
> Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
> ---
>  include/uapi/linux/capability.h |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h
> index ba478fa..7109e65 100644
> --- a/include/uapi/linux/capability.h
> +++ b/include/uapi/linux/capability.h
> @@ -343,7 +343,11 @@ struct vfs_cap_data {
>  
>  #define CAP_BLOCK_SUSPEND    36
>  
> -#define CAP_LAST_CAP         CAP_BLOCK_SUSPEND
> +/* Allow things that trivially permit root to modify the running kernel */
> +
> +#define CAP_COMPROMISE_KERNEL  37
> +
> +#define CAP_LAST_CAP         CAP_COMPROMISE_KERNEL
>  
>  #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
>  

-- 
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