[CSE]  Advanced Operating Systems 
 COMP9242 2002/S2 
UNSW

PRINTER Printer-Friendly Version
Administration               
- Notices
- Course Intro
- Consultations
# On-line Survey (closed)
- Survey Results
 
Work
- Lectures
- Milestone 0
- Project Admin
- Project Spec
- Project FAQ
- Exam
 
Documentation
- ASysT Lab
- L4 source browser
- Sulima ISA Simulator
R4x00 ISA Summary 
MIPS R4700 ReferenceMIPS R4000 User Manual 
- Network Driver
- GT64111
 
Related Info
- Aurema OS Prize
- OS Hall of Fame
 
History
- 2000
- 1999
- 1998
 
Staff
- Gernot Heiser (LiC)

 
Valid HTML 4.0!
next up previous
Next: Issues for Protection System Up: 03-caps Previous: Access matrix model

Access matrix properties

  • Rows define agents' protection domains
  • Columns define objects' accessibility
  • Dynamic data structure: frequent
    • permanent changes (e.g. chmod)
    • temporary changes (e.g. setuid)
  • Very sparse with many repeated entries
  • Usually not stored explicitly.



Gernot Heiser 2002-08-15