From patchwork Sun Jul 24 15:30:23 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Pitre X-Patchwork-Id: 72675 Delivered-To: patch@linaro.org Received: by 10.140.29.52 with SMTP id a49csp743979qga; Sun, 24 Jul 2016 08:32:09 -0700 (PDT) X-Received: by 10.66.248.10 with SMTP id yi10mr12932411pac.31.1469374328610; Sun, 24 Jul 2016 08:32:08 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id i8si28543393pfk.43.2016.07.24.08.32.08; Sun, 24 Jul 2016 08:32:08 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752638AbcGXPbd (ORCPT + 29 others); Sun, 24 Jul 2016 11:31:33 -0400 Received: from alt42.smtp-out.videotron.ca ([23.233.128.29]:34835 "EHLO alt42.smtp-out.videotron.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751882AbcGXPak (ORCPT ); Sun, 24 Jul 2016 11:30:40 -0400 Received: from yoda.home ([96.23.157.65]) by Videotron with SMTP id RLMUbj1Tp6cTKRLMVbnNBZ; Sun, 24 Jul 2016 11:30:39 -0400 X-Authority-Analysis: v=2.1 cv=TfA2zUkh c=1 sm=1 tr=0 a=keA3yYpnlypCNW5BNWqu+w==:117 a=keA3yYpnlypCNW5BNWqu+w==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=cAmyUtKerLwA:10 a=KKAkSRfTAAAA:8 a=tBb2bbeoAAAA:8 a=KLsVztuV4oJ-JjwXQ7gA:9 a=cvBusfyB2V15izCimMoJ:22 a=Oj-tNtZlA1e06AYgeCfH:22 Received: from xanadu.home (xanadu.home [192.168.2.2]) by yoda.home (Postfix) with ESMTP id 2EB402DA069E; Sun, 24 Jul 2016 11:30:36 -0400 (EDT) From: Nicolas Pitre To: Greg Ungerer , linux-fsdevel@vger.kernel.org Cc: Alan Cox , Alexander Viro , David Howells , linux-arm-kernel@lists.infradead.org, linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 09/15] binfmt_flat: use clear_user() rather than memset() to clear .bss Date: Sun, 24 Jul 2016 11:30:23 -0400 Message-Id: <1469374229-21585-10-git-send-email-nicolas.pitre@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1469374229-21585-1-git-send-email-nicolas.pitre@linaro.org> References: <1469374229-21585-1-git-send-email-nicolas.pitre@linaro.org> X-CMAE-Envelope: MS4wfERxFnQY2e5pe9SNXnEdZwtdgfYGErdkbNjIdWcM6DzRmvK8u+44Wn5SNEsWGOgnCyqNQQhrAWHsNqFYtfu2Wxbc79qwDmrX6NHl4YARrIjuiRTgwGkj mMNyoF6QyRlN46YiuX+BmAxa89kKwYIUO16OWnPGj8DSLB/VcpsKYmRsAio/EStnAoz0Lcq9q9OZqGTJMRU8zSgIX1f7mLFcbq1qgzgpNndW1Y68wb1IvfJy RWJKoKSeLdj11UecgCRutmvPG8W/1fs/exEfdRzSC+e9tplxfgfPFV+6Ue8RfEa5n6aD39wxQWEEXHdnVz3AQlhOFxqNQEwAIxiajOXv8kqFsQsuBH3P1TRQ AOSHP+tK/2V+O1HLs11GGiQrcnwUEZ4uWW5yvzBLYJ6IV68eFWUVyunEj9zJI6OIM7Sx5PnNusPCKLNFxg+G8byWwB+RB4wLjGYJC83NNPxs4q+VB3Q= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is needed on systems with a MMU. Signed-off-by: Nicolas Pitre Reviewed-by: Greg Ungerer --- fs/binfmt_flat.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) -- 2.7.4 diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index 63756ca6a7..92c1530a2c 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -795,10 +795,11 @@ static int load_flat_file(struct linux_binprm *bprm, flush_icache_range(start_code, end_code); /* zero the BSS, BRK and stack areas */ - memset((void *)(datapos + data_len), 0, bss_len + - (memp + memp_size - stack_len - /* end brk */ - libinfo->lib_list[id].start_brk) + /* start brk */ - stack_len); + if (clear_user((void __user *)(datapos + data_len), bss_len + + (memp + memp_size - stack_len - /* end brk */ + libinfo->lib_list[id].start_brk) + /* start brk */ + stack_len)) + return -EFAULT; return 0; err: