linux-kernel - Re: [PATCH 10/12] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment

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Date:	Tue, 19 Mar 2013 16:47:27 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
CC:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	kexec@...ts.infradead.org, linux-pci@...r.kernel.org,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [PATCH 10/12] acpi: Ignore acpi_rsdp kernel parameter in a secure
 boot environment

On 03/19/2013 05:32 AM, Matthew Garrett wrote:
> From: Josh Boyer <jwboyer@...hat.com>
> 
> This option allows userspace to pass the RSDP address to the kernel.  This
> could potentially be used to circumvent the secure boot trust model.
> We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability.
> 
> Signed-off-by: Josh Boyer <jwboyer@...hat.com>
> ---
>  drivers/acpi/osl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 586e7e9..0ef63f1 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -245,7 +245,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
>  acpi_physical_address __init acpi_os_get_root_pointer(void)
>  {
>  #ifdef CONFIG_KEXEC
> -	if (acpi_rsdp)
> +	if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL))
>  		return acpi_rsdp;
>  #endif
>  
> 

This does not work because capable is not usable at this early point.

Josh, could you update your fix here?

-- 
Thanks
Dave


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