From patchwork Wed Aug 1 19:57:53 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Kosina X-Patchwork-Id: 1265721 Return-Path: X-Original-To: patchwork-linux-parisc@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id D93EBDF215 for ; Wed, 1 Aug 2012 19:58:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754209Ab2HAT6B (ORCPT ); Wed, 1 Aug 2012 15:58:01 -0400 Received: from cantor2.suse.de ([195.135.220.15]:45574 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754155Ab2HAT6A (ORCPT ); Wed, 1 Aug 2012 15:58:00 -0400 Received: from relay2.suse.de (unknown [195.135.220.254]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id E20B0A2FD7; Wed, 1 Aug 2012 21:57:58 +0200 (CEST) Date: Wed, 1 Aug 2012 21:57:53 +0200 (CEST) From: Jiri Kosina To: "James E.J. Bottomley" , Helge Deller Cc: linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] parisc: fix personality flag check in copy_thread() Message-ID: User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org Directly comparing task_struct->personality against PER_* is not fully correct, as it doesn't take flags potentially stored in top three bytes into account. Analogically, directly forcefully setting personality to PER_LINUX32 or PER_LINUX discards any flags stored in the top three bytes. Signed-off-by: Jiri Kosina --- Found accidentally, untested, I don't have the hardware. arch/parisc/kernel/process.c | 2 +- arch/parisc/kernel/sys_parisc.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index d4b94b3..2c05a92 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -309,7 +309,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp, cregs->ksp = (unsigned long)stack + (pregs->gr[21] & (THREAD_SIZE - 1)); cregs->gr[30] = usp; - if (p->personality == PER_HPUX) { + if (personality(p->personality) == PER_HPUX) { #ifdef CONFIG_HPUX cregs->kpc = (unsigned long) &hpux_child_return; #else diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c index c9b9322..f309990 100644 --- a/arch/parisc/kernel/sys_parisc.c +++ b/arch/parisc/kernel/sys_parisc.c @@ -225,12 +225,12 @@ long parisc_personality(unsigned long personality) long err; if (personality(current->personality) == PER_LINUX32 - && personality == PER_LINUX) - personality = PER_LINUX32; + && personality(personality) == PER_LINUX) + personality &= ~PER_LINUX | PER_LINUX32; err = sys_personality(personality); - if (err == PER_LINUX32) - err = PER_LINUX; + if (personality(err) == PER_LINUX32) + err &= ~PER_LINUX32 | PER_LINUX; return err; }