Re: [PATCH V2 07/10] Secure boot: Add a dummy kernel parameter thatwill switch on Secure Boot mode

[Greg KH]

On Thu, Sep 20, 2012 at 10:41:02AM -0400, Matthew Garrett wrote:
> From: Josh Boyer <jwboyer@xxxxxxxxxx>
> 
> This forcibly drops CAP_COMPROMISE_KERNEL from both cap_permitted and cap_bset
> in the init_cred struct, which everything else inherits from.  This works on
> any machine and can be used to develop even if the box doesn't have UEFI.
> 
> Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx>
> ---
>  kernel/cred.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/kernel/cred.c b/kernel/cred.c
> index de728ac..7e6e83f 100644
> --- a/kernel/cred.c
> +++ b/kernel/cred.c
> @@ -623,6 +623,23 @@ void __init cred_init(void)
>  				     0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
>  }
>  
> +void __init secureboot_enable()
> +{
> +	pr_info("Secure boot enabled\n");
> +	cap_lower((&init_cred)->cap_bset, CAP_COMPROMISE_KERNEL);
> +	cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL);
> +}
> +
> +/* Dummy Secure Boot enable option to fake out UEFI SB=1 */
> +static int __init secureboot_enable_opt(char *str)
> +{
> +	int sb_enable = !!simple_strtol(str, NULL, 0);
> +	if (sb_enable)
> +		secureboot_enable();
> +	return 1;
> +}
> +__setup("secureboot_enable=", secureboot_enable_opt);

Document this please in the bootparams file.

thanks,

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/