linux-kernel - Re: ima: use of radix tree cache indexing == massive waste of memory?

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Date:	Sun, 17 Oct 2010 10:09:20 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, Mimi Zohar <zohar@...ibm.com>,
	warthog9@...nel.org, hpa@...or.com, devel@...ts.fedoraprojet.org
Subject: Re: ima: use of radix tree cache indexing == massive waste of
 memory?

On Sun, 2010-10-17 at 13:02 +0200, Peter Zijlstra wrote:
> On Sun, 2010-10-17 at 01:57 -0400, Mimi Zohar wrote:
> > On Sat, 2010-10-16 at 15:20 -0400, Christoph Hellwig wrote:
> > > Besides the algorithmic problems with ima, why is kernel.org using
> > > IMA to start with?  Except for IBM looking for a reason to jusity why
> > > TPM isn't a completely waster of ressources it's pointless.  And it was
> > > only merged under the premise that it would not affect innocent normal
> > > users.
> > > 
> > 
> > Can we keep this at the design level please? When IMA is enabled, it
> > needs to store information on a per inode basis, yet has to wait to
> > late_initcall() for the TPM, at which point some inodes would have
> > already been created.  
> 
> Being build (CONFIG_IMA=y) is not the same as default enabled. Is there
> a way to build this stuff and not have it enabled?

At one point there was a command line option, similar to
SECURITY_SELINUX_BOOTPARAM, to enable/disable IMA.  Based on review
here, it was removed.

Mimi

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