No-eXecute allows the administrator to mark certain areas as "non-executable" which can protect the system against different forms of Malware.
The NX bit (no-execute) is a technology used in CPUs to segregate areas of memory for use by either storage of processor instructions (code) or for storage of data, a feature normally only found in Harvard architecture processors. However, the NX bit is being increasingly used in conventional von Neumann architecture processors, for security reasons.
An operating system with support for the NX bit may mark certain areas of memory as non-executable. The processor will then …