From: Markku Savela <msa@moth.iki.fi>
To: linux-kernel@vger.kernel.org
Subject: Re: Using x86 segments against NULL pointer deference exploit
Date: Tue, 10 Nov 2009 18:46:49 +0200 [thread overview]
Message-ID: <874op2wcna.fsf@burp.tkv.asdf.org> (raw)
In-Reply-To: <dDwJH-3PE-7@gated-at.bofh.it> (castet matthieu's message of "Fri\, 06 Nov 2009 14\:10\:01 +0100")
I'm wondering why on architectures that actually have EXECUTE
permission memory management, the user space is mapped into kernel
with EXECUTE enabled!!!??
If the user space were not mapped with EXECUTE enabled, the
restriction of mapping the 0-page in user space is not required
anymore.
next parent reply other threads:[~2009-11-10 17:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <dDwJH-3PE-7@gated-at.bofh.it>
2009-11-10 16:46 ` Markku Savela [this message]
2009-11-11 14:11 ` Using x86 segments against NULL pointer deference exploit Jiri Kosina
2009-11-06 12:59 castet.matthieu
2009-11-06 13:13 ` Alan Cox
2009-11-06 20:35 ` matthieu castet
2009-11-09 6:30 ` H. Peter Anvin
2009-11-06 20:18 ` Andi Kleen
2009-11-08 14:38 ` matthieu castet
2009-11-08 19:41 ` Andi Kleen
2009-11-06 20:58 ` Jiri Kosina
2009-11-06 22:54 ` H. Peter Anvin
2009-11-07 10:20 ` Jiri Kosina
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