Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space)

[Linus Torvalds]

On Wed, 3 Jun 2009, Eric Paris wrote:
> 
> I am at least interested in hearing about the 'performance plummet.'

It's perhaps not so much SElinux itself, but the AUDIT support (which it 
requires) that is really _very_ noticeable on microbenchmarks.

Last time I ran lmbench on a Fedora kernel it was horrible. Turning off 
AUDIT (which also turns off SElinux) fixes it.

It may be crazy distro auditing rules or whatever, but that doesn't change 
the basic issue. 

		Linus
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