12th Generation Intel® Core™ Processors Datasheet, Volume 1 of 2


ID 655258
Date 28/10/2021 00:00:00
Public Content

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Document Table of Contents

User Mode Instruction Prevention

User Mode Instruction Prevention (UMIP) provides additional hardening capability to the OS kernel by allowing certain instructions to execute only in supervisor mode (Ring 0).

If the OS opt-in to use UMIP, the following instruction are enforced to run in supervisor mode:

  • SGDT - Store the GDTR register value
  • SIDT - Store the IDTR register value
  • SLDT - Store the LDTR register value
  • SMSW - Store Machine Status Word
  • STR - Store the TR register value

An attempt at such execution in user mode causes a general protection exception (#GP).

UMIP specifications and functional descriptions are included in the Intel® 64 Architectures Software Developer’s Manual, Volume 3. Available at: