linux-kernel - Re: [origin tree boot crash] Revert "selinux: clean up avc node cache when disabling selinux"

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Date:	Sat, 12 Sep 2009 12:43:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Paris <eparis@...hat.com>
Cc:	James Morris <jmorris@...ei.org>, Thomas Liu <tliu@...hat.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [origin tree boot crash] Revert "selinux: clean up avc node
	cache when disabling selinux"


* Eric Paris <eparis@...hat.com> wrote:

> On Sat, 2009-09-12 at 09:24 +0200, Ingo Molnar wrote:
> > James - i did not see a security pull request email from you in my 
> > lkml folder so i created this new thread. -tip testing found the 
> > easy crash below. It reverts cleanly so i went that easy route.
> > 
> > At a really quick 10-seconds glance the crash happens because we 
> > destroy the slab cache twice, if the sysctl is toggled twice?
> 
> No, it's only being free'd once (and can only be freed once since 
> the /selinuxfs file disappears when it happens).  It's being freed 
> while there are still entries in it.
> 
> This actually points out to me that SELinux was leaking memory 
> when disabled at run time (not when disabled from the kernel 
> command line) and that's the real problem.
> 
> I'll take a look at it tonight, James, if you haven't ask Linus to 
> pull can you hold off until I get this long standing memory leak 
> fixed?  If Linus already took the change we should revert and do 
> them both again. (This patch is right, just obviously incomplete)

FYI, the changes went all upstream yesterday.

	Ingo
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