From patchwork Thu Sep 28 12:39:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mimi Zohar X-Patchwork-Id: 9975905 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 CC87160365 for ; Thu, 28 Sep 2017 12:41:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BF1B2295A3 for ; Thu, 28 Sep 2017 12:41:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0607295B9; Thu, 28 Sep 2017 12:41:21 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F921295B5 for ; Thu, 28 Sep 2017 12:41:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753053AbdI1MlG (ORCPT ); Thu, 28 Sep 2017 08:41:06 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:49160 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752532AbdI1MlB (ORCPT ); Thu, 28 Sep 2017 08:41:01 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v8SCdAfE107173 for ; Thu, 28 Sep 2017 08:41:00 -0400 Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) by mx0a-001b2d01.pphosted.com with ESMTP id 2d8xbu23y4-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 28 Sep 2017 08:41:00 -0400 Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 28 Sep 2017 22:40:54 +1000 Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v8SCesBZ42926088; Thu, 28 Sep 2017 22:40:54 +1000 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v8SCesMD006735; Thu, 28 Sep 2017 22:40:54 +1000 Received: from localhost.localdomain.com ([9.80.86.128]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v8SCefS6006434; Thu, 28 Sep 2017 22:40:50 +1000 From: Mimi Zohar To: linux-security-module@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, Mimi Zohar , linux-integrity@vger.kernel.org, Christoph Hellwig , Linus Torvalds , Linux Kernel Mailing List , Jan Kara , "Theodore Ts'o" Subject: [RFC PATCH 2/3] integrity: use call_read_iter to calculate the file hash Date: Thu, 28 Sep 2017 08:39:32 -0400 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506602373-4799-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1506602373-4799-1-git-send-email-zohar@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17092812-0044-0000-0000-000002882A16 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17092812-0045-0000-0000-0000071E4C6B Message-Id: <1506602373-4799-3-git-send-email-zohar@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-09-28_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1709280189 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch replaces the ->read file operation method in integrity_kernel_read() with the newer ->read_iter and sets the read_iter rwf flag to indicate that the i_rwsem has been taken exclusively. Signed-off-by: Mimi Zohar --- security/integrity/iint.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/security/integrity/iint.c b/security/integrity/iint.c index c84e05866052..df406bb96792 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -16,11 +16,13 @@ * using a rbtree tree. */ #include +#include #include #include #include #include #include +#include #include "integrity.h" static struct rb_root integrity_iint_tree = RB_ROOT; @@ -184,18 +186,25 @@ security_initcall(integrity_iintcache_init); int integrity_kernel_read(struct file *file, loff_t offset, void *addr, unsigned long count) { - mm_segment_t old_fs; - char __user *buf = (char __user *)addr; + struct inode *inode = file_inode(file); + struct kvec iov = { .iov_base = addr, .iov_len = count }; + struct kiocb kiocb; + struct iov_iter iter; ssize_t ret; + lockdep_assert_held(&inode->i_rwsem); + if (!(file->f_mode & FMODE_READ)) return -EBADF; + if (!file->f_op->read_iter) + return -EBADF; - old_fs = get_fs(); - set_fs(get_ds()); - ret = __vfs_read(file, buf, count, &offset); - set_fs(old_fs); + init_sync_kiocb(&kiocb, file); + kiocb.ki_pos = offset; + iov_iter_kvec(&iter, READ | ITER_KVEC, &iov, 1, count); + ret = call_read_iter(file, &kiocb, &iter, 1); + BUG_ON(ret == -EIOCBQUEUED); return ret; }