Date: Wed, 2 Jun 2004 23:43:50 +0200
From: Andi Kleen <ak@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, torvalds@osdl.org,
       arjanv@redhat.com, suresh.b.siddha@intel.com, jun.nakajima@intel.com
Subject: Re: [announce] [patch] NX (No eXecute) support for x86,
 2.6.7-rc2-bk2
Message-Id: <20040602234350.7332dd8e.ak@suse.de>
In-Reply-To: <20040602205025.GA21555@elte.hu>
References: <20040602205025.GA21555@elte.hu>
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On Wed, 2 Jun 2004 22:50:25 +0200
Ingo Molnar <mingo@elte.hu> wrote:

> 
> we'd like to announce the availability of the following kernel patch:
> 
>      http://redhat.com/~mingo/nx-patches/nx-2.6.7-rc2-bk2-AE

I think you still have the change_page_attr() bug that I so far
didn't manage to fix on x86-64 properly neither (I had one patch, but 
it caused mysterious other failures). Currently x86-64 has a nasty 
partly broken workaround for this only that can cause illegal aliases.

The bug is when change_page_attr() splits a kernel text page
and reverts it back then the NX bit gets set on the kernel
text page. This happens when AGP allocates a page that lies 
within 2MB of the kernel mapping.

-Andi
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