Date: Mon, 20 Jul 2009 13:37:38 +0200 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com Subject: Re: Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable On Mon, Jul 20, 2009 at 03:29:09PM +0400, Solar Designer wrote: > Marcus, > > 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 2.6.23-220.127.116.11 > > 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. Foremost, the mmap_min_addr protection is not in older kernels (<2.6.23) at all, so its kinda "not implemented" instead of "bug". Ciao, Marcus
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