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CONFIG_X86_UMIP: User Mode Instruction Prevention

General informations

The Linux kernel configuration item CONFIG_X86_UMIP:

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User Mode Instruction Prevention (UMIP) is a security feature in some x86 processors. If enabled, a general protection fault is issued if the SGDT, SLDT, SIDT, SMSW or STR instructions are executed in user mode. These instructions unnecessarily expose information about the hardware state.

The vast majority of applications do not use these instructions. For the very few that do, software emulation is provided in specific cases in protected and virtual-8086 modes. Emulated results are dummy.



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