linux-kernel - Re: [PATCH 07/27] kexec_file: Disable at runtime if securelevel has been set

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Message-ID: <32764.1509378584@warthog.procyon.org.uk>
Date:   Mon, 30 Oct 2017 15:49:44 +0000
From:   David Howells <dhowells@...hat.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     dhowells@...hat.com, joeyli <jlee@...e.com>,
        linux-security-module@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        linux-efi@...r.kernel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jforbes@...hat.com,
        Matthew Garrett <mjg59@...gle.com>
Subject: Re: [PATCH 07/27] kexec_file: Disable at runtime if securelevel has been set

Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:

> Huh?!  With the "secure_boot" policy enabled on the boot command line,
> IMA-appraisal would verify the kexec kernel image, firmware, kernel
> modules, and custom IMA policy signatures.

What happens if the "secure_boot" policy isn't enabled on the boot command
line?  Can you sum up both cases in a paragraph I can add to the patch
description?

> Other patches in this patch series need to be updated as well to check
> if IMA-appraisal is enabled.

Which exactly?  I've added your "!is_ima_appraise_enabled() &&" line to
kexec_file() and module_sig_check().  Anything else?

David