Re: [PATCH 2/3] SELinux: add security_task_movememory calls to mm code

[Serge E. Hallyn]

Quoting James Morris (jmorris@xxxxxxxxx):
> From: David Quigley <dpquigl@xxxxxxxxxxxxx>
> 
> This patch inserts security_task_movememory hook calls into memory
> management code to enable security modules to mediate this operation
> between tasks.
> 
> Since the last posting, the hook has been renamed following feedback from
> Christoph Lameter.
> 
> This patch is aimed at 2.6.18 inclusion.
> 
> Please apply.

Hi,

sorry if I'm being dense - what is actually being protected against
here?  The only thing I can think of is one process causing performance
degradation to another by moving it's memory further from it's cpu on a
NUMA machine.

Is there something more?  (And is what I'm guessing even possible?)

I'm not arguing against this hook, just wondering whether there's
more to this than I see.

thanks,
-serge
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