Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753724Ab2JZApq (ORCPT ); Thu, 25 Oct 2012 20:45:46 -0400 Received: from mail.kernel.org ([198.145.19.201]:52608 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753122Ab2JZAGE (ORCPT ); Thu, 25 Oct 2012 20:06:04 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Jiri Kosina , "David S. Miller" Subject: [ 26/31] sparc64: do not clobber personality flags in sys_sparc64_personality() Date: Thu, 25 Oct 2012 17:04:33 -0700 Message-Id: <20121026000217.605739577@linuxfoundation.org> X-Mailer: git-send-email 1.7.12.2.421.g261b511 In-Reply-To: <20121026000214.941721299@linuxfoundation.org> References: <20121026000214.941721299@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1865 Lines: 57 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiri Kosina [ Upstream commit a27032eee8cb6e16516f13c8a9752e9d5d4cc430 ] There are multiple errors in how sys_sparc64_personality() handles personality flags stored in top three bytes. - directly comparing current->personality against PER_LINUX32 doesn't work in cases when any of the personality flags stored in the top three bytes are used. - directly forcefully setting personality to PER_LINUX32 or PER_LINUX discards any flags stored in the top three bytes Fix the first one by properly using personality() macro to compare only PER_MASK bytes. Fix the second one by setting only the bits that should be set, instead of overwriting the whole value. Signed-off-by: Jiri Kosina Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/kernel/sys_sparc_64.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -519,12 +519,12 @@ SYSCALL_DEFINE1(sparc64_personality, uns { int ret; - if (current->personality == PER_LINUX32 && - personality == PER_LINUX) - personality = PER_LINUX32; + if (personality(current->personality) == PER_LINUX32 && + personality(personality) == PER_LINUX) + personality |= PER_LINUX32; ret = sys_personality(personality); - if (ret == PER_LINUX32) - ret = PER_LINUX; + if (personality(ret) == PER_LINUX32) + ret &= ~PER_LINUX32; return ret; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/