linux-kernel - Re: [PATCH V38 15/29] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down

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Message-ID: <CACdnJutcF6ZdQKwz7L+i9FUuD8SBsHuhk8rwQpwfDsCpM1y9dA@mail.gmail.com>
Date:   Wed, 14 Aug 2019 11:02:32 -0700
From:   Matthew Garrett <mjg59@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     James Morris <jmorris@...ei.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Josh Boyer <jwboyer@...hat.com>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Dave Young <dyoung@...hat.com>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH V38 15/29] acpi: Ignore acpi_rsdp kernel param when the
 kernel has been locked down

On Wed, Aug 14, 2019 at 10:46 AM Borislav Petkov <bp@...en8.de> wrote:
> Yeah, ok, I see what you're doing there. AFAICT, you do that in
>
> setup_arch->acpi_boot_table_init-> ... -> acpi_os_get_root_pointer()

Right.

> I hope nothing needs it earlier because then we'll have to restructure
> again...

Passing the RSDP via command line is a pretty grotesque hack - we
should just set up boot params in kexec_file, which would leave this
as a problem for legacy kexec and nothing else.