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

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Message-ID: <26694.1509030144@warthog.procyon.org.uk>
Date:   Thu, 26 Oct 2017 16:02:24 +0100
From:   David Howells <dhowells@...hat.com>
To:     joeyli <jlee@...e.com>
Cc:     dhowells@...hat.com, Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        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 07/27] kexec_file: Disable at runtime if securelevel has been set

joeyli <jlee@...e.com> wrote:

> +	if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) &&
> +	    !is_ima_appraise_enabled() &&
> +	    kernel_is_locked_down("kexec of unsigned images"))

This doesn't seem right.  It seems that you can then kexec unsigned images
into a locked-down kernel if IMA appraise is enabled.

I think the commit message needs expansion as to why it's okay.  Can you also
do it as an additional patch rather than altering the original IMA-less patch
7?

David