Messages in this thread | | | Subject | Re: [v6 PATCH 00/21] x86: Enable User-Mode Instruction Prevention | From | Stas Sergeev <> | Date | Wed, 8 Mar 2017 19:53:58 +0300 |
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08.03.2017 19:46, Andy Lutomirski пишет: >> 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 your "COMPAT_MASK0_X86_UMIP_FIXUP" and "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.
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