Yes, you are right, sorry. Should be "Intel screwed up implementing Protected Mode by missing one privileged accesses trap - Protected Mode program (CPL 3, IOP

Yes, you are right, sorry. Should be "Intel screwed up implementing Protected Mode by missing one privileged accesses trap - Protected Mode program (CPL 3, IOPL < 3) executing CLI and expecting POPF to restore interrupt flag. CLI will correctly trap, but POPF is silently ignored AND doesnt trap. No easy workarounds available." One of the prominent victims is Doom. Works in Windows only due to hacks.