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

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Message-ID: <bef08268-238b-c5e9-1737-a2675f453b8e@list.ru>
Date:   Wed, 8 Mar 2017 19:53:58 +0300
From:   Stas Sergeev <stsp@...t.ru>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Gerst <brgerst@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Liang Z Li <liang.z.li@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Chen Yucong <slaoub@...il.com>,
        Alexandre Julliard <julliard@...ehq.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Shuah Khan <shuah@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, linux-msdos@...r.kernel.org,
        wine-devel@...ehq.org
Subject: Re: [v6 PATCH 00/21] x86: Enable User-Mode Instruction Prevention

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.