From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754833AbbERVzh (ORCPT ); Mon, 18 May 2015 17:55:37 -0400 Received: from www.linutronix.de ([62.245.132.108]:51405 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752671AbbERVze (ORCPT ); Mon, 18 May 2015 17:55:34 -0400 Date: Mon, 18 May 2015 23:55:44 +0200 (CEST) From: Thomas Gleixner To: Dave Hansen cc: linux-kernel@vger.kernel.org, x86@kernel.org, dave.hansen@linux.intel.com Subject: Re: [PATCH 19/19] x86, mpx: allow mixed binaries again In-Reply-To: <20150508185958.9A26D455@viggo.jf.intel.com> Message-ID: References: <20150508185948.4C19F4B0@viggo.jf.intel.com> <20150508185958.9A26D455@viggo.jf.intel.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001,URIBL_BLOCKED=0.001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 8 May 2015, Dave Hansen wrote: > We explicitly disable allowing 32-bit binaries to enable > MPX on 64-bit kernels. Re-allow that. > > Signed-off-by: Dave Hansen Reviewed-by: Thomas Gleixner > --- > > b/arch/x86/mm/mpx.c | 6 ------ > 1 file changed, 6 deletions(-) > > diff -puN arch/x86/mm/mpx.c~x86-mpx-allow-mixed-binaries-again arch/x86/mm/mpx.c > --- a/arch/x86/mm/mpx.c~x86-mpx-allow-mixed-binaries-again 2015-05-08 11:46:23.253134695 -0700 > +++ b/arch/x86/mm/mpx.c 2015-05-08 11:46:23.256134830 -0700 > @@ -368,12 +368,6 @@ static __user void *mpx_get_bounds_dir(v > return MPX_INVALID_BOUNDS_DIR; > > /* > - * 32-bit binaries on 64-bit kernels are currently > - * unsupported. > - */ > - if (IS_ENABLED(CONFIG_X86_64) && test_thread_flag(TIF_IA32)) > - return MPX_INVALID_BOUNDS_DIR; > - /* > * The bounds directory pointer is stored in a register > * only accessible if we first do an xsave. > */ > _ >