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Date: Mon, 20 Jul 2009 15:29:09 +0400
From: Solar Designer <>
Subject: Re: Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable


On Mon, Jul 20, 2009 at 12:01:47PM +0200, Marcus Meissner wrote:
> - fixed the personality - PER_CLEAR_ON_SETTID inheritance issue (CVE-2009-1895)
>   to work around mmap_min_addr protection.
>   Affects 2.6.23-

What makes you think this does not affect earlier kernels?  This does
not match my analysis, but maybe I am missing something, hence I ask.

BTW, as you're aware, this fix is a hardening measure for/against
SUID-root programs with a certain class of design errors in them; it is
not exactly a fix for the kernel itself, although it should be in the
kernel.  I do not mean to downplay the issue, but I think it is
important that we distinguish the different types of changes that we are
making in response to Brad's exploit.


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