From patchwork Tue Jul 12 21:27:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Pitre X-Patchwork-Id: 71883 Delivered-To: patch@linaro.org Received: by 10.140.29.52 with SMTP id a49csp684460qga; Tue, 12 Jul 2016 14:43:39 -0700 (PDT) X-Received: by 10.66.52.47 with SMTP id q15mr7640288pao.67.1468359813277; Tue, 12 Jul 2016 14:43:33 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b6si5655054pay.102.2016.07.12.14.43.33; Tue, 12 Jul 2016 14:43:33 -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 S1751885AbcGLVnZ (ORCPT + 30 others); Tue, 12 Jul 2016 17:43:25 -0400 Received: from alt22.smtp-out.videotron.ca ([70.80.0.73]:40102 "EHLO alt22.smtp-out.videotron.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751828AbcGLVnW (ORCPT ); Tue, 12 Jul 2016 17:43:22 -0400 Received: from yoda.home ([96.23.157.65]) by Videotron with SMTP id N5DlbKnXlPTiyN5DmbzXVS; Tue, 12 Jul 2016 17:28:02 -0400 X-Authority-Analysis: v=2.1 cv=L469O7n8 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=0uNKG0NQF1f1rLkwhCQA:9 a=cvBusfyB2V15izCimMoJ:22 Received: from xanadu.home (xanadu.home [192.168.2.2]) by yoda.home (Postfix) with ESMTP id 5B5BD2DA0692; Tue, 12 Jul 2016 17:28:00 -0400 (EDT) From: Nicolas Pitre To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Alexander Viro , David Howells , Greg Ungerer Subject: [PATCH 07/10] binfmt_flat: use clear_user() rather than memset() to clear .bss Date: Tue, 12 Jul 2016 17:27:39 -0400 Message-Id: <1468358862-11799-8-git-send-email-nicolas.pitre@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1468358862-11799-1-git-send-email-nicolas.pitre@linaro.org> References: <1468358862-11799-1-git-send-email-nicolas.pitre@linaro.org> X-CMAE-Envelope: MS4wfDTrLLPQq9JVeC4LnYm6o+b71ZFsDEwKxkjFr1MNnr+4Ngm/7HL664p3gYy/INIck10pwJ6/VU+93S5xyvcxMcYucqgiqE5N0b161n3cIbcG3qK2IZqt 47DbJRTRCOv46IdIFIHobhGJKM8JKaxm53wbqHoU5cQuAhYjGeV3AoLICkZMAEh+2GqYwM9lO/U/AkssJh1NBOgBSuPee/IrOA55Ymz0JoLJ34anYMHAivl5 J8M8HQnLU3PFU35HSGPLPfqN4bpYIRjmm1yV+DdwxCVLQLzLtex+4uj9nHEIq/7jQrQwCVNGw/DqSunJDeSGbg== 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 --- fs/binfmt_flat.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) -- 2.7.4 diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index c85f8f1239..e981e66bb5 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -803,10 +803,11 @@ 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 + + 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); + stack_len)) + return -EFAULT; return 0; err: