Secure Coding mailing list archives

Segments, eh Smithers?

From: alekc at avet.com.pl (Aleksander P. Czarnowski)
Date: Wed, 5 Apr 2006 00:20:01 +0200

Some quick thoughts on this subject regarding x86 architecture:

- I think we need to define better the term segment, because you also have
selectors in case of flat mode 
- secondly you can provide some protection mechanism using not only rings
but also memory pages and descriptor check, page directory check and page
check itself
- it's not only the problem of protecting memory areas but also what is a
privilege instruction - for example sidt or sldt opcodes used today for
identifying VMWare-alike environments
- accessing other ranges of memory like I/O ports 

Just my 2 cents...
Regards,
Alex Czarnowski
AVET INS

Current thread:

Segments, eh Smithers? Crispin Cowan (Apr 03)
- Segments, eh Smithers? ljknews (Apr 04)
  - Segments, eh Smithers? Michael S Hines (Apr 04)
- Segments, eh Smithers? der Mouse (Apr 04)
- Segments, eh Smithers? Blue Boar (Apr 04)
- Segments, eh Smithers? Steven M. Bellovin (Apr 04)
- Segments, eh Smithers? Aleksander P. Czarnowski (Apr 04)
- <Possible follow-ups>
- Segments, eh Smithers? karger at watson.ibm.com (Apr 04)