linux-kernel - Re: [AppArmor 00/44] AppArmor security module overview

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Date:	Mon, 2 Jul 2007 14:09:26 -0700 (PDT)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Christoph Hellwig <hch@...radead.org>,
	Casey Schaufler <casey@...aufler-ca.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Johansen <jjohansen@...e.de>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [AppArmor 00/44] AppArmor security module overview


--- Christoph Hellwig <hch@...radead.org> wrote:

> On Mon, Jul 02, 2007 at 12:31:49PM -0700, Casey Schaufler wrote:
> > It's true that the code review for AppArmor has proven difficult.
> > That's going to be true of any change to the vfs layer, for any
> > reason. Have someone who was there tell you about the original XFS
> > proposals some time. Again, it's not LSM's fault.
> 
> Utterly wrong comparism.  There haven't been any VFS changes for XFS.

Ah, I suggested the original proposal, not what actually got in.
Two very different things. The XFS developers listened to the initial
feedback and, after picking themselves up off the floor, got up and
adjusted their plans.

> There has been some new functionality in the core kernel, but the
> more interesting bits where in the VM (e.g. vmap which is now widely
> used).
> 
> AA on the other hand just fucks up VFS layering to implement really dumb
> semantics.
> 
> A better comparism would be to some of the original reiser4 suggestions,
> although to be as bad you'd have to look at Hans' whitepapers and not
> actually existing code.  And yes, there's a reason his pipedreams never
> got anywhere near merged.

Agreed that the further up you want to mess things the tougher the
task you have ahead of you. That's what I was hoping to get across,
but it looks as if you have better, more recent examples than what
I offered.

Thank you.


Casey Schaufler
casey@...aufler-ca.com
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