Re: Upcoming Windows XP SP2 NX feature
From: Paul Webster (ptwebster_at_DATASECURITYSOFTWARE.COM)
Date: 01/31/04
- Previous message: Jerry Haltom: "Windows automated software deploy tool"
- In reply to: Yuval Kashtan: "Upcoming Windows XP SP2 NX feature"
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Date: Sat, 31 Jan 2004 14:52:50 -0500 To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM
PAE was introduced in the Pentium II series of CPUs. As has been previously
stated the PAE NX bit currently only exists on 64-bit CPUs. I think you are
mistaking execution limitation via segmentation with limitation via
page-attributes. The 286 does not support paging, only a limited protected
mode. The 386 was the first Intel CPU to provide a paging mode and it
lacked a NX bit and split-TLB making page-level execution restriction
impossible. On Pentium/Athlon and later CPUs it is possible to have
non-executable pages via the split-TLB method. This is how OverflowGuard
provides its protection.
-Paul Webster
Data Security Software Inc.
OverflowGuard -- http://www.datasecuritysoftware.com -- XP SP2 style
memory protection without need for a 64-bit CPU and XP SP2.
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- Previous message: Jerry Haltom: "Windows automated software deploy tool"
- In reply to: Yuval Kashtan: "Upcoming Windows XP SP2 NX feature"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]
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