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: 9244959 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 89CD8607FD for ; Sun, 24 Jul 2016 15:33:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7A74A2521F for ; Sun, 24 Jul 2016 15:33:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6EDB426224; Sun, 24 Jul 2016 15:33:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 116762521F for ; Sun, 24 Jul 2016 15:33:20 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bRLNX-0000Cl-M7; Sun, 24 Jul 2016 15:31:43 +0000 Received: from alt42.smtp-out.videotron.ca ([23.233.128.29]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bRLMq-0008Pu-5g for linux-arm-kernel@lists.infradead.org; Sun, 24 Jul 2016 15:31:04 +0000 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 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= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160724_083100_605797_89AD06E0 X-CRM114-Status: UNSURE ( 9.22 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alan Cox , linux-kernel@vger.kernel.org, David Howells , linux-m68k@lists.linux-m68k.org, Alexander Viro , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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(-) 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: