CS208 Introduction to Computer Systems
Wednesday, 5 November 2025

+ Buffer overflow?
- How would you try to fix this vulnerability?
    - Application programmer
        - check memory bounds (our "Gets" is obviously dumb)
        - clean the user input before using it
            [this won't help if the problem is in the
                initial reading of the input]
        - 
    - Programming languages where writing outside the
        bounds of an array is impossible (Java, Rust)
    - Put some recognizable data on the boundaries of
        arrays, and check for corruption
    - Don't let code on the stack get executed
    - Randomize the addresses at which the program lives
        *at runtime*

+ Remainder of the term
- Processes C assignment (due Nov 11)
- Small client/server C assignment (due Nov 14)
- In-class labs on various topics
- In-class exam (Monday, Nov 17)
- Wrap-up, AMA, etc. (Wednesday, Nov 19)
- No exam or project during finals week

+ Lab: processes

+ fork & exec