linux-kernel - Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

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Date:   Thu, 6 Apr 2017 21:43:54 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org,
        Josh Boyer <jwboyer@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        matthew.garrett@...ula.com
Subject: Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel
 has been locked down

On Wed, Apr 5, 2017 at 10:16 PM, David Howells <dhowells@...hat.com> 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 circumvent any restrictions imposed on
> loading modules.  Ignore the option when the kernel is locked down.

I'm not really sure here.

What exactly is the mechanism?

Thanks,
Rafael