linux-kernel - Re: [PATCH v2] ima: force signature verification when CONFIG_KEXEC

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Date:   Wed, 13 Jul 2022 10:23:35 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Coiby Xu <coxu@...hat.com>, linux-integrity@...r.kernel.org
Cc:     kexec@...ts.infradead.org, Baoquan He <bhe@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, Jiri Bohac <jbohac@...e.cz>,
        David Howells <dhowells@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:SECURITY SUBSYSTEM" 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v2] ima: force signature verification when
 CONFIG_KEXEC_SIG is configured

On Wed, 2022-07-13 at 15:21 +0800, Coiby Xu wrote:
> Currently, an unsigned kernel could be kexec'ed when IMA arch specific
> policy is configured unless lockdown is enabled. Enforce kernel
> signature verification check in the kexec_file_load syscall when IMA
> arch specific policy is configured.
> 
> Fixes: 99d5cadfde2b ("kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE")
> Reported-by: Mimi Zohar <zohar@...ux.ibm.com>
> Suggested-by: Mimi Zohar <zohar@...ux.ibm.com>
> Signed-off-by: Coiby Xu <coxu@...hat.com>
> ---
> v2
>  - don't include linux/kexec.h since it's already been included in
>    linux/ima.h
>  - fix build errors when KEXEC_FILE/KEXEC_CORE is disable as caught by
>    kernel test robot <lkp@...el.com>

Thanks, Coiby.  This version of the patch is now queued in next-
integrity/next-
integrity-testing.

Mimi