linux-kernel - Re: [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction Prevention definitions

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Date:   Wed, 7 Jun 2017 20:24:22 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        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>,
        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>,
        Stas Sergeev <stsp@...t.ru>, Fenghua Yu <fenghua.yu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-msdos@...r.kernel.org, wine-devel@...ehq.org,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction
 Prevention definitions

On Fri, May 05, 2017 at 11:17:18AM -0700, Ricardo Neri wrote:
> User-Mode Instruction Prevention is a security feature present in new
> Intel processors that, when set, prevents the execution of a subset of
> instructions if such instructions are executed in user mode (CPL > 0).
> Attempting to execute such instructions causes a general protection
> exception.
> 
> The subset of instructions comprises:
> 
>  * SGDT - Store Global Descriptor Table
>  * SIDT - Store Interrupt Descriptor Table
>  * SLDT - Store Local Descriptor Table
>  * SMSW - Store Machine Status Word
>  * STR  - Store Task Register
> 
> This feature is also added to the list of disabled-features to allow
> a cleaner handling of build-time configuration.
> 
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Chen Yucong <slaoub@...il.com>
> Cc: Chris Metcalf <cmetcalf@...lanox.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Fenghua Yu <fenghua.yu@...el.com>
> Cc: Huang Rui <ray.huang@....com>
> Cc: Jiri Slaby <jslaby@...e.cz>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Liang Z. Li <liang.z.li@...el.com>
> Cc: Alexandre Julliard <julliard@...ehq.org>
> Cc: Stas Sergeev <stsp@...t.ru>
> Cc: x86@...nel.org
> Cc: linux-msdos@...r.kernel.org
> 
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> ---
>  arch/x86/include/asm/cpufeatures.h          | 1 +
>  arch/x86/include/asm/disabled-features.h    | 8 +++++++-
>  arch/x86/include/uapi/asm/processor-flags.h | 2 ++
>  3 files changed, 10 insertions(+), 1 deletion(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--