Dailydave mailing list archives
RE: Non executable memory pages with AMD64 + XP SP2
From: "Mike Bailey" <mike.bailey () sunbladesecurity com>
Date: Sun, 5 Dec 2004 17:22:00 -0500
Did anyone out there have a chance to test non-executable memory pages on AMD64 + XP SP2 ? I sent a mail on Bugtraq a few weeks ago but I did not receive much support from the community.
I actually tried to talk to the "Enhanced Virus Protection" NX bit speaker a few weeks ago at an AMD conference and he didn't really want to discuss the subjects of "applications tested to work with" at all. Others speaking also pretty much said the same thing about good luck finding real 64bit drivers that are not just the old 32bit ones hacked to not fail on load under XP and 2003. They talked positively about Linux/Unix support but apps still need to be rewritten to take advantage of the proc before you'll notice much. Are you trying it on an Athalon or Opteron?
It seems to me that non-executable pages are never enabled (at least for basic user programs, such as "hello world" buffer overflow), unless you manually specify /PAE, despite: http://support.microsoft.com/kb/875352
If you read the small caps on AMD commercials in France, they say something like: "you must manually enable the Enhanced Virus Protection for each of your application to be fully protected". What is this supposed to mean ???
Out of curiosity what DEP config switches have you tried in your boot.ini? Optin being the default sounds like what the commercials are saying. _______________________________________________ Dailydave mailing list Dailydave () lists immunitysec com https://lists.immunitysec.com/mailman/listinfo/dailydave
Current thread:
- Non executable memory pages with AMD64 + XP SP2 Nicolas RUFF (Dec 05)
- RE: Non executable memory pages with AMD64 + XP SP2 Mike Bailey (Dec 05)
- <Possible follow-ups>
- RE: Non executable memory pages with AMD64 + XP SP2 Maynor, David (ISS Atlanta) (Dec 05)
- RE: Non executable memory pages with AMD64 + XP SP2 Maynor, David (ISS Atlanta) (Dec 05)
- Re: Non executable memory pages with AMD64 + XP SP2 Nicolas RUFF (Dec 06)
- RE: Non executable memory pages with AMD64 + XP SP2 Maynor, David (ISS Atlanta) (Dec 06)