📝 Copy on Write in virtual Memory

Q1. What does the term copy‑on‑write (COW) describe in virtual memory management?

💡 Difficulty: easy | ✅ Correct: C

Q2. Process A calls fork(), creating Process B. Both have a read‑only mapping of libX.so. Immediately after fork, Process B writes to a global variable in libX. Which mechanism handles the write?

💡 Difficulty: medium | ✅ Correct: A

Q3. A process’s virtual address space has a hole from \(0x60000000\) to \(0x70000000\). The stack grows downwards and currently ends at \(0x60100000\). If the stack expands by \(0x20000\) bytes, which address will cause the first page fault?

💡 Difficulty: hard | ✅ Correct: A