Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757272AbaDXVx1 (ORCPT ); Thu, 24 Apr 2014 17:53:27 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:39852 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756944AbaDXVxS (ORCPT ); Thu, 24 Apr 2014 17:53:18 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Kleikamp , Bob Picco , Allen Pais , "David S. Miller" , sparclinux@vger.kernel.org Subject: [PATCH 3.4 20/27] sparc64: dont treat 64-bit syscall return codes as 32-bit Date: Thu, 24 Apr 2014 14:55:54 -0700 Message-Id: <20140424215552.582457774@linuxfoundation.org> X-Mailer: git-send-email 1.9.0 In-Reply-To: <20140424215551.942390050@linuxfoundation.org> References: <20140424215551.942390050@linuxfoundation.org> User-Agent: quilt/0.61-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Kleikamp [ Upstream commit 1535bd8adbdedd60a0ee62e28fd5225d66434371 ] When checking a system call return code for an error, linux_sparc_syscall was sign-extending the lower 32-bit value and comparing it to -ERESTART_RESTARTBLOCK. lseek can return valid return codes whose lower 32-bits alone would indicate a failure (such as 4G-1). Use the whole 64-bit value to check for errors. Only the 32-bit path should sign extend the lower 32-bit value. Signed-off-by: Dave Kleikamp Acked-by: Bob Picco Acked-by: Allen Pais Cc: David S. Miller Cc: sparclinux@vger.kernel.org Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/kernel/syscalls.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/sparc/kernel/syscalls.S +++ b/arch/sparc/kernel/syscalls.S @@ -184,7 +184,8 @@ linux_sparc_syscall32: mov %i0, %l5 ! IEU1 5: call %l7 ! CTI Group brk forced srl %i5, 0, %o5 ! IEU1 - ba,a,pt %xcc, 3f + ba,pt %xcc, 3f + sra %o0, 0, %o0 /* Linux native system calls enter here... */ .align 32 @@ -212,7 +213,6 @@ linux_sparc_syscall: 3: stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] ret_sys_call: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %g3 - sra %o0, 0, %o0 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 sllx %g2, 32, %g2 -- 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/