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Date: Mon, 20 Jul 2009 15:49:57 +0400
From: Solar Designer <>
Subject: Re: Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable

On Mon, Jul 20, 2009 at 01:37:38PM +0200, Marcus Meissner wrote:
> Foremost, the mmap_min_addr protection is not in older kernels (<2.6.23) at all,
> so its kinda "not implemented" instead of "bug".

Oh, understood.  I did not think that way, because mmap_min_addr is
implemented in recent 2.4 kernels, which are sort of "older", and it is
also implemented in RHEL-5'ish OpenVZ kernels that we actually use.
(BTW, I'd be happy to share the mmap_min_addr back-port patch to
RHEL-5'ish kernels with Red Hat if there's any interest.)

I am going to release with a CVE-2009-1895 fix in it, and I
expect it to get into  It's not important for systems with
"sane" userlands (no crappy SUID-root programs), though.


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