linux-kernel - Re: [PATCH 2/6] integrity: Linux Integrity Module(LIM)

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Message-ID: <20081203202543.GA16279@infradead.org>
Date:	Wed, 3 Dec 2008 15:25:43 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	David Safford <safford@...son.ibm.com>,
	Serge Hallyn <serue@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 2/6] integrity: Linux Integrity Module(LIM)

On Wed, Dec 03, 2008 at 02:13:20PM -0600, Serge E. Hallyn wrote:
> > Can you explain what all this template stuff is about?  The only method
> > of these ever called is display_template,
> 
> I'm not sure what you mean here - must_measure for instance is used (in
> patch 3) in the integrity hooks (i.e. file_mmap) to decide whether or not 
> the object (action target) must be measured.

ima_must_measure (or the other implementation bits) are called a lot.
But never through the indirection I quoted.

> > and that seems to be better
> > implented directly as a securityfs file, without the indirection.
> 
> That comment doesn't make sense to me (unless you're saying to punt
> on the generic integrity infrastructure and hook all of the IMA
> code straight into the kernel) so I suspect I'm misreading
> something.

ima_measurements_show alaways calls ima_template_show, and both are
implemented inside the ima module.  There's absolutely no point for the
indirection here.

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