Computer Science › Section D · Operating systems › Topic D.6
Operating system security
The operating system oversees everything a computer does, so it is also the computer's main security guard. It decides who may log in, keeps each process inside its own memory, and relies on special processor features so that no ordinary program can seize control of the machine.
In this topic
- Why the OS guards the machine
- Accounts and logging in
- Passwords and their weaknesses
- Worked example: counting the guesses
- Auditing and sniffing software
- Attacks from within
- Fencing in a process's memory
- Privileged mode and privileged instructions
- Worked example: tracing a bounds violation
- Least privilege and keeping up to date
- Common mistakes to avoid
- Key takeaways
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