# No-exec / NX

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## Basic Information

Die **No-Execute (NX)** bit, ook bekend as **Execute Disable (XD)** in Intel terminologie, is 'n hardeware-gebaseerde sekuriteitskenmerk wat ontwerp is om die gevolge van **buffer overflow** aanvalle te **verlig**. Wanneer dit geïmplementeer en geaktiveer is, onderskei dit tussen geheuegebiede wat bedoel is vir **uitvoerbare kode** en dié wat bedoel is vir **data**, soos die **stack** en **heap**. Die kernidee is om te voorkom dat 'n aanvaller kwaadwillige kode uitvoer deur middel van buffer overflow kwesbaarhede deur die kwaadwillige kode in die stack te plaas en die uitvoeringsvloei daarna te lei.

## Bypasses

* Dit is moontlik om tegnieke soos [**ROP**](../stack-overflow/rop-return-oriented-programing.md) te gebruik om hierdie beskerming te omseil deur stukke uitvoerbare kode wat reeds in die binêre teenwoordig is, uit te voer.
* [**Ret2libc**](../stack-overflow/ret2lib/)
* [**Ret2syscall**](../stack-overflow/rop-syscall-execv.md)
* **Ret2...**

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