From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932778AbcHJDlO (ORCPT ); Tue, 9 Aug 2016 23:41:14 -0400 Received: from ozlabs.org ([103.22.144.67]:58698 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932584AbcHJDlM (ORCPT ); Tue, 9 Aug 2016 23:41:12 -0400 From: Michael Ellerman To: Thiago Jung Bauermann , Mimi Zohar Cc: linux-security-module@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-ima-devel@lists.sourceforge.net, Dave Young Subject: Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list In-Reply-To: <3544655.o5QPxko4Ba@hactar> References: <1470313475-20090-1-git-send-email-zohar@linux.vnet.ibm.com> <87wpjqtdg8.fsf@concordia.ellerman.id.au> <1470747673.2881.118.camel@linux.vnet.ibm.com> <3544655.o5QPxko4Ba@hactar> User-Agent: Notmuch/0.21 (https://notmuchmail.org) Date: Wed, 10 Aug 2016 13:41:08 +1000 Message-ID: <87r39xthnv.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Thiago Jung Bauermann writes: > Am Dienstag, 09 August 2016, 09:01:13 schrieb Mimi Zohar: >> On Tue, 2016-08-09 at 20:59 +1000, Michael Ellerman wrote: >> > Mimi Zohar writes: >> > > diff --git a/security/integrity/ima/ima.h >> > > b/security/integrity/ima/ima.h >> > > index b5728da..84e8d36 100644 >> > > --- a/security/integrity/ima/ima.h >> > > +++ b/security/integrity/ima/ima.h >> > > @@ -102,6 +102,13 @@ struct ima_queue_entry { >> > > >> > > }; >> > > extern struct list_head ima_measurements; /* list of all > measurements >> > > */ >> > > >> > > +/* Some details preceding the binary serialized measurement list */ >> > > +struct ima_kexec_hdr { >> > > + unsigned short version; >> > > + unsigned long buffer_size; >> > > + unsigned long count; >> > > +} __packed; >> > > + >> > >> > Am I understanding it correctly that this structure is passed between >> > kernels? >> Yes, the header prefixes the measurement list, which is being passed on >> the same computer to the next kernel. Could the architecture (eg. >> LE/BE) change between soft re-boots? > > Yes. I am able to boot a BE kernel from an LE kernel with my patches. > Whether we want to support that or not is another question... Yes you must support that. BE -> LE and vice versa. You should also consider the possibility that the next kernel is not Linux. cheers