From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S934324AbbDXT6Z (ORCPT <rfc822;w@1wt.eu>);
	Fri, 24 Apr 2015 15:58:25 -0400
Received: from mail.skyhub.de ([78.46.96.112]:55602 "EHLO mail.skyhub.de"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S933576AbbDXT6X (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Fri, 24 Apr 2015 15:58:23 -0400
Date: Fri, 24 Apr 2015 21:58:09 +0200
From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@kernel.org>
Cc: Denys Vlasenko <dvlasenk@redhat.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Denys Vlasenko <vda.linux@googlemail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Brian Gerst <brgerst@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>, Oleg Nesterov <oleg@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Alexei Starovoitov <ast@plumgrid.com>, Will Drewry <wad@chromium.org>,
        Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86_64, asm: Work around AMD SYSRET SS descriptor
 attribute issue
Message-ID: <20150424195809.GC24894@pd.tnic>
References: <5d120f358612d73fc909f5bfa47e7bd082db0af0.1429841474.git.luto@kernel.org>
 <553A140E.9090409@redhat.com>
 <20150424105906.GB24894@pd.tnic>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20150424105906.GB24894@pd.tnic>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Apr 24, 2015 at 12:59:06PM +0200, Borislav Petkov wrote:
> Yeah, that makes more sense. So I tested Andy's patch but changed it as
> above and I get
> 
> $ taskset -c 0 ./sysret_ss_attrs_32
> [RUN]   Syscalls followed by SS validation
> [OK]    We survived

Andy, you wanted the 64-bit version too:

$ taskset -c 0 ./sysret_ss_attrs_64
[RUN]   Syscalls followed by SS validation
[OK]    We survived
$ taskset -c 0 ./sysret_ss_attrs_64
[RUN]   Syscalls followed by SS validation
[OK]    We survived

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--