Hall of FameAleph One199631 min readtutorialintermediate
Smashing the Stack for Fun and Profit
Summary
The article explains how stack‑based buffer overflows work on x86 Linux, showing stack layout, how overwriting the saved return address can hijack control flow, and demonstrates a simple C exploit. It remains a foundational guide for understanding classic memory‑corruption attacks.
- Stack frames store saved EBP, return address, then locals; overflowing a local buffer can overwrite the saved return address.
- Overwriting the return address with attacker‑controlled data redirects execution to injected shellcode or arbitrary code.
- The article shows how to compute the offset (e.g., 12 bytes) from a buffer start to the return address on a 32‑bit stack.
- A minimal C exploit modifies the return address to skip code, demonstrating control‑flow hijacking.
Security engineers and low‑level C developers should care because stack overflows are the basis of many classic exploits and understanding them is essential for building and defending modern software.
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