linux-kernel - Re: [PATCH 15/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

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Date:   Fri, 20 Oct 2017 14:45:43 +0800
From:   joeyli <jlee@...e.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-security-module@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        linux-efi@...r.kernel.org, matthew.garrett@...ula.com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        jforbes@...hat.com
Subject: Re: [PATCH 15/27] acpi: Ignore acpi_rsdp kernel param when the
 kernel has been locked down

On Thu, Oct 19, 2017 at 03:52:27PM +0100, David Howells wrote:
> From: Josh Boyer <jwboyer@...hat.com>
> 
> This option allows userspace to pass the RSDP address to the kernel, which
> makes it possible for a user to modify the workings of hardware .  Reject
> the option when the kernel is locked down.
> 
> Signed-off-by: Josh Boyer <jwboyer@...hat.com>
> Signed-off-by: David Howells <dhowells@...hat.com>

I have reviewed this patch. Please feel free to add:

Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com>

Thanks!
Joey Lee

> cc: Dave Young <dyoung@...hat.com>
> cc: linux-acpi@...r.kernel.org
> ---
> 
>  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 db78d353bab1..36c6527c1b0a 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -192,7 +192,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
>  	acpi_physical_address pa = 0;
>  
>  #ifdef CONFIG_KEXEC
> -	if (acpi_rsdp)
> +	if (acpi_rsdp && !kernel_is_locked_down("ACPI RSDP specification"))
>  		return acpi_rsdp;
>  #endif
>  
> 
> --
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