From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0B5FC43381 for ; Mon, 1 Apr 2019 13:44:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86CF8208E4 for ; Mon, 1 Apr 2019 13:44:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728641AbfDANoX (ORCPT ); Mon, 1 Apr 2019 09:44:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:50702 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726968AbfDANoW (ORCPT ); Mon, 1 Apr 2019 09:44:22 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1AE9B218FF; Mon, 1 Apr 2019 13:44:22 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.92) (envelope-from ) id 1hAxEb-0003Q0-7e; Mon, 01 Apr 2019 09:44:21 -0400 Message-Id: <20190401134421.121919570@goodmis.org> User-Agent: quilt/0.65 Date: Mon, 01 Apr 2019 09:41:08 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Linus Torvalds , Ingo Molnar , Andrew Morton , Andy Lutomirski , Roland McGrath , Oleg Nesterov , linux-arch@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , "Gustavo A. R. Silva" , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org, Dominik Brodowski , Andy Lutomirski , Kees Cook , "Eric W. Biederman" , "Dmitry V. Levin" , Palmer Dabbelt , Will Drewry , Guo Ren Subject: [PATCH 4/6 v3] csky: Fix syscall_get_arguments() and syscall_set_arguments() References: <20190401134104.676620247@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Dmitry V. Levin" C-SKY syscall arguments are located in orig_a0,a1,a2,a3,regs[0],regs[1] fields of struct pt_regs. Due to an off-by-one bug and a bug in pointer arithmetic syscall_get_arguments() was reading orig_a0,regs[1..5] fields instead. Likewise, syscall_set_arguments() was writing orig_a0,regs[1..5] fields instead. Link: http://lkml.kernel.org/r/20190329171230.GB32456@altlinux.org Fixes: 4859bfca11c7d ("csky: System Call") Cc: Ingo Molnar Cc: Kees Cook Cc: Andy Lutomirski Cc: Will Drewry Cc: Guo Ren Cc: stable@vger.kernel.org # v4.20+ Signed-off-by: Dmitry V. Levin Signed-off-by: Steven Rostedt (VMware) --- arch/csky/include/asm/syscall.h | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h index d637445737b7..9a9cd81e66c1 100644 --- a/arch/csky/include/asm/syscall.h +++ b/arch/csky/include/asm/syscall.h @@ -49,10 +49,11 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, if (i == 0) { args[0] = regs->orig_a0; args++; - i++; n--; + } else { + i--; } - memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0])); + memcpy(args, ®s->a1 + i, n * sizeof(args[0])); } static inline void @@ -63,10 +64,11 @@ syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, if (i == 0) { regs->orig_a0 = args[0]; args++; - i++; n--; + } else { + i--; } - memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0)); + memcpy(®s->a1 + i, args, n * sizeof(regs->a1)); } static inline int -- 2.20.1