linux-kernel - Re: [PATCH 00/14] EVM

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Message-ID: <1275664158.3205.27.camel@localhost.localdomain>
Date:	Fri, 04 Jun 2010 11:09:18 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Shaz <shazalive@...il.com>
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...ia.com>,
	James Morris <jmorris@...ei.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	David Safford <safford@...son.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	securityengineeringresearchgroup 
	<securityengineeringresearchgroup@...glegroups.com>
Subject: Re: [PATCH 00/14] EVM

On Fri, 2010-06-04 at 11:53 +0500, Shaz wrote:
> > Yes, verifying one file containing the hashes would be faster than
> > verifying individual hashes stored as extended attributes (xattrs), but
> > this does not take into account that files on a running system are being
> > modified or added. On a small form factor, the number of files is
> > limited, but would this scale well? In addition, what protects that one
> > file containing all the hashes from being modified?  So, if you limit
> 
> How about sealing to protect this file?

Was just indicating that the file needs to be protected. So, yes sealing
the file, based on PCRs, would work in a trusted boot environment.

> > the types of files to those that don't change, and the number of file
> > hashes, then using a single file would be faster.

Mimi


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