linux-kernel - Re: An actual suggestion (Re: [GIT PULL] Kernel lockdown for secure boot)

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Date:   Thu, 5 Apr 2018 09:25:19 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     David Howells <dhowells@...hat.com>
cc:     Andy Lutomirski <luto@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Matthew Garrett <mjg59@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Justin Forbes <jforbes@...hat.com>,
        linux-man <linux-man@...r.kernel.org>, joeyli <jlee@...e.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: An actual suggestion (Re: [GIT PULL] Kernel lockdown for secure
 boot)

On Wed, 4 Apr 2018, David Howells wrote:

> > 6. There's a way to *decrease* the lockdown level below the configured
> > value.  (This ability itself may be gated by a config option.)
> > Choices include a UEFI protected variable,
> 
> By turning secure boot off, maybe?

It's surely reasonable to allow an already secure-booted system to be 
debugged without needing to be rebooted.



- James
-- 
James Morris
<jmorris@...ei.org>