Re: [v6 PATCH 00/21] x86: Enable User-Mode Instruction Prevention

From: Stas Sergeev
Date: Wed Mar 08 2017 - 11:56:30 EST

08.03.2017 19:46, Andy Lutomirski ÐÐÑÐÑ:
No no, since I meant prot mode, this is not what I need.
I would never need to disable UMIP as to allow the
prot mode apps to do SLDT. Instead it would be good
to have an ability to provide a replacement for the dummy
emulation that is currently being proposed for kernel.
All is needed for this, is just to deliver a SIGSEGV.
That's what I meant. Turning off FIXUP_UMIP would leave UMIP on but
turn off the fixup, so you'd get a SIGSEGV indicating #GP (or a vm86
GP exit).
But then I am confused with the word "compat" in
"sys_adjust_compat_mask(int op, int word, u32 mask);"

Leaving UMIP on and only disabling a fixup doesn't
sound like a compat option to me. I would expect
compat to disable it completely.