CONFIG_X86_INTEL_MPX:

General informations

The Linux kernel configuration item CONFIG_X86_INTEL_MPX:

• prompt:
• type: bool
• depends on: CONFIG_CPU_SUP_INTEL && CONFIG_X86_64
• defined in arch/x86/Kconfig
• found in Linux kernels: 3.19, 4.0–4.20, 5.0–5.5

Help text

MPX provides hardware features that can be used in conjunction with compiler-instrumented code to check memory references. It is designed to detect buffer overflow or underflow bugs.

This option enables running applications which are instrumented or otherwise use MPX. It does not use MPX itself inside the kernel or to protect the kernel against bad memory references.

Enabling this option will make the kernel larger: ~8k of kernel text and 36 bytes of data on a 64-bit defconfig. It adds a long to the 'mm_struct' which will increase the kernel memory overhead of each process and adds some branches to paths used during exec() and munmap().

For details, see Documentation/x86/intel_mpx.rst

If unsure, say N.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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