linux-kernel - Re: [PATCH 10/11] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment

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Date:	Tue, 4 Sep 2012 10:30:46 -0600
From:	Shuah Khan <shuahkhan@...il.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [PATCH 10/11] acpi: Ignore acpi_rsdp kernel parameter in a secure
 boot environment

On Tue, Sep 4, 2012 at 9:55 AM, Matthew Garrett <mjg@...hat.com> 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_SECURE_FIRMWARE capability.

Does this mean, acpi_rsdp is disabled on all current platforms that
don't support CAP_SECURE_FIRMWARE?

-- Shuah
>
> 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 9eaf708..50c94e4 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -246,7 +246,7 @@ 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_SECURE_FIRMWARE))
>                 return acpi_rsdp;
>  #endif
>
> --
> 1.7.11.4
>
> --
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