Re: Some Concrete AppArmor Questions - was Re: [RFC][PATCH 0/11] security: AppArmor - Overview

[Andi Kleen]

On Thursday 27 April 2006 13:02, Christoph Hellwig wrote:
> On Thu, Apr 27, 2006 at 08:15:30AM +1000, Neil Brown wrote:
> > 3/ Is AppArmour's approach of using d_path to get a filename from a
> >    dentry valid and acceptable?
> 
> Clear no, and that should have been obvious to the aa people from the
> beginning.  To make a path-based approach actually work as designed you
> need to hook up higher, where the real path is available. 

What do you mean with real path? Even in open the path can be quite weird
("dir1/../dir2/../dir3/..." etc.)

I suspect it will always need to work with sanitized paths.

Starting from the dentry for that is a quite reasonable, although
d_path indeed seems quite inefficient without any caching mechanism.

-Andi
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