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Interview question · Systems, OS & Memory Safety

What happens, step by step, when you run a program on Linux or Windows, and where does security get enforced along the way?

Typing a command sets off a chain: a system call, a permission check, a loader, dynamic linking and memory protections. Every step is a place security is enforced, and a place it can be bypassed.

mediumEssentialNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

Typing a command sets off a chain: a system call, a permission check, a loader, dynamic linking and memory protections. Every step is a place security is enforced, and a place it can be bypassed.

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  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A detection fires: a web server process started a program from /tmp on a Linux host.

  1. How does a program start on Linux?
  2. What checks happen at execution?
  3. Why is this detection suspicious?
  4. What do you check first?
  5. How do you prevent it?
  6. How would you respond and harden?

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