CS140 Operating Systems and Systems Programming Midterm Exam February 4th, 2005 (Total time = 50 minutes, Total Points = 50) Name: (please print)______________________________ In recognition of and in the spirit of the S

Source URL: www.scs.stanford.edu

The Confused Deputy (or why capabilities might have been invented) Norm Hardy Senior Architect Key Logic 5200 Great America Parkway

Source URL: www.scs.stanford.edu

Administrivia • Remember send email for any course staff to: - cs140-staff gets priority than my personal mailbox • Assignment 1 due one week from now

Source URL: www.scs.stanford.edu

• Operations research
• Scheduling
• Central processing unit
• Time
• FIFO
• Rate-monotonic scheduling
• Earliest deadline first scheduling
• Scheduling algorithms
• Concurrent computing
• Computing

SEPTEMBERWRL Research ReportShared Memory

Source URL: www.scs.stanford.edu

Why disk arrays? • CPUs speeds increase faster than disks - Time won’t really help workloads where disk in bottleneck • Some applications (audio/video) require big files • Disk arrays - make one logical disk out

Source URL: www.scs.stanford.edu

Administrivia CPU Scheduling • Remember send email for any course staff to:

Source URL: www.scs.stanford.edu

Review: FFS background Review: FFS [McKusic] basics • 1980s improvement to original Unix FS, which had: • Change block size to at least 4K

Source URL: www.scs.stanford.edu

The Flask Security Architecture: System Support for Diverse Security Policies Ray Spencer Secure Computing Corporation Stephen Smalley, Peter Loscocco National Security Agency Mike Hibler, David Andersen, Jay Lepreau Uni

Source URL: www.scs.stanford.edu

DAC vs. MAC • Most people familiar with discretionary access control (DAC) - Unix permission bits are an example - Might set a file private so only group friends can read it

Source URL: www.scs.stanford.edu

• Computer memory
• Bell–LaPadula model
• Covert channel
• Mandatory access control
• Classified information
• Htop
• CPU cache
• Access control
• Security clearance
• Security
• Computer security
• Computing

CS240 – Advanced Topics in Operating Systems Instructor: David Mazi`eres CA: Ryan Stutsman Stanford University

Source URL: www.scs.stanford.edu

• Virtual machines
• Operating system
• Email
• Macintosh
• Kernel
• System software
• Computing
• Software