![]() However, almost all operating systems for the 80386 and later x86 processors implement the flat memory model, so they cannot use this capability. X86 processors, since the 80286, included a similar capability implemented at the segment level. The term NX bit itself is sometimes used to describe similar technologies in other processors.Īrchitecture support x86 ![]() The ARM architecture refers to the feature, which was introduced in ARMv6, as XN (execute never). The MIPS architecture refers to the feature as XI bit (execute inhibit). Intel markets the feature as the XD bit (execute disable). The term NX bit originated with Advanced Micro Devices (AMD), as a marketing term. The general technique, known as executable space protection, also called Write XOR Execute, is used to prevent certain types of malicious software from taking over computers by inserting their code into another program's data storage area and running their own code from within this section one class of such attacks is known as the buffer overflow attack. The processor will then refuse to execute any code residing in these areas of the address space. An operating system with support for the NX bit may mark certain areas of an address space as non-executable. The NX bit (no-execute) is a technology used in CPUs to segregate areas of a virtual address space for use by either storage of processor instructions or for storage of data.
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