linux-kernel - Re: [PATCH V2 01/10] Secure boot: Add new capability

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Message-ID: <20120928031056.GA5478@sergelap>
Date:	Thu, 27 Sep 2012 22:10:56 -0500
From:	Serge Hallyn <serge.hallyn@...onical.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH V2 01/10] Secure boot: Add new capability

Quoting Matthew Garrett (mjg@...hat.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.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>

Acked-by: Serge E. Hallyn <serge.hallyn@...ntu.com>

> ---
>  include/linux/capability.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index d10b7ed..4345bc8 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -364,7 +364,11 @@ struct cpu_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)
>  
> -- 
> 1.7.11.4
> 
> --
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