linux-kernel - Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list

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Message-Id: <1470751377.2881.137.camel@linux.vnet.ibm.com>
Date:	Tue, 09 Aug 2016 10:02:57 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	"'Thiago Jung Bauermann'" <bauerman@...ux.vnet.ibm.com>,
	Dave Young <dyoung@...hat.com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"linux-ima-devel@...ts.sourceforge.net" 
	<linux-ima-devel@...ts.sourceforge.net>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list

On Tue, 2016-08-09 at 13:35 +0000, David Laight wrote:

> Also why '__packed' - guarantees sub-optimal code generation.
> Much better to include explicit padding to align everything.

This patch set does not define a new format, but piggy backs on top of
the existing <securityfs>/ima/binary_runtime_measurements list.  The
prefixed buffer header includes a version, so that if in the future we
need to modify the format, we would be able to.

In terms of the prefixed header, how would you define the fields:
version, buffer size, number of measurements? 

Mimi