Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Data Execution Prevention is a security feature included in modern operation systems. It is available in Linux, Mac OS X and the newer Microsoft Windows operating systems and is intended to prevent an application or service from executing code from a non-executable memory region. This helps prevent certain exploits that store code via a buffer overflow, for example. DEP runs in two modes: hardware-enforced DEP for CPUs that can mark memory pages as nonexecutable, and software-enforced DEP with a limited prevention for CPUs that do not have hardware support. Software-enforced DEP does not protect from execution of code in data pages, but instead from another type of attack. DEP was introduced on Linux in 2000, on Windows in 2004 with Windows XP Service Pack 2, while Apple introduced DEP in 2006.

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