Re: [RFC][PATCH 11/11] security: AppArmor - Export namespacesemaphore

[Stephen Smalley]

On Thu, 2006-04-20 at 08:21 -0500, Serge E. Hallyn wrote:
> Tony, do you have any performance measurements?  Both for unconfined and
> confined apps?  Presumably unconfined processes should have 0 performance
> hit, right?

Preferably something that exercises open, mkdir, link... and friends
intensively, not just the old WebStone data that I've seen posted
before.  

But you don't really need the benchmarks - just look at the code, and
think about the implications of allocating a page and calling d_path on
every permission(9) call (on every component) plus from the separate
hooks in the vfs_ helpers and further consider the impact of taking the
dcache lock all the time there.  And look at the iterators being used in
aa_perm_dentry as well as the truly fun ones in aa_link.  All because
they are doing it from LSM hooks that were never intended to be used
this way.

-- 
Stephen Smalley
National Security Agency

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