From patchwork Sun Apr 14 11:37:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 10899815 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 74E0E139A for ; Sun, 14 Apr 2019 11:37:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F267289C0 for ; Sun, 14 Apr 2019 11:37:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5144C28AD4; Sun, 14 Apr 2019 11:37:37 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 56E7528ADC for ; Sun, 14 Apr 2019 11:37:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726598AbfDNLhe (ORCPT ); Sun, 14 Apr 2019 07:37:34 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:51182 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726983AbfDNLhe (ORCPT ); Sun, 14 Apr 2019 07:37:34 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3EBYEtZ043191 for ; Sun, 14 Apr 2019 07:37:33 -0400 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0b-001b2d01.pphosted.com with ESMTP id 2ruvktkub8-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sun, 14 Apr 2019 07:37:33 -0400 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 14 Apr 2019 12:37:32 +0100 Received: from b01cxnp23034.gho.pok.ibm.com (9.57.198.29) by e11.ny.us.ibm.com (146.89.104.198) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Sun, 14 Apr 2019 12:37:29 +0100 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3EBbSxT22937644 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 14 Apr 2019 11:37:28 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AFF1A2805A; Sun, 14 Apr 2019 11:37:28 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3ADDA28059; Sun, 14 Apr 2019 11:37:25 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.71.201]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Sun, 14 Apr 2019 11:37:24 +0000 (GMT) From: Chandan Rajendra To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fscrypt@vger.kernel.org Cc: Chandan Rajendra , tytso@mit.edu, adilger.kernel@dilger.ca, ebiggers@kernel.org, jaegeuk@kernel.org, yuchao0@huawei.com Subject: [RFC PATCH V2 03/14] fsverity: Add call back to decide if verity check has to be performed Date: Sun, 14 Apr 2019 17:07:53 +0530 X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190414113804.26769-1-chandan@linux.ibm.com> References: <20190414113804.26769-1-chandan@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19041411-2213-0000-0000-00000376C05F X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010925; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000284; SDB=6.01188935; UDB=6.00622896; IPR=6.00969712; MB=3.00026436; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-14 11:37:32 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19041411-2214-0000-0000-00005E0578BC Message-Id: <20190414113804.26769-4-chandan@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-14_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904140086 Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Ext4 and F2FS store verity metadata in data extents (beyond inode->i_size) associated with a file. But other filesystems might choose alternative means to store verity metadata. Hence this commit adds a callback function pointer to 'struct fsverity_operations' to help in deciding if verity operation needs to performed against a page-cache page holding file data. Signed-off-by: Chandan Rajendra --- fs/ext4/super.c | 6 ++++++ fs/post_read_process.c | 4 +++- include/linux/fsverity.h | 1 + 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index aba724f82cc3..63d73b360f1d 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1428,10 +1428,16 @@ static struct page *ext4_read_verity_metadata_page(struct inode *inode, return read_mapping_page(inode->i_mapping, index, NULL); } +static bool ext4_verity_required(struct inode *inode, pgoff_t index) +{ + return index < (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; +} + static const struct fsverity_operations ext4_verityops = { .set_verity = ext4_set_verity, .get_metadata_end = ext4_get_verity_metadata_end, .read_metadata_page = ext4_read_verity_metadata_page, + .verity_required = ext4_verity_required, }; #endif /* CONFIG_FS_VERITY */ diff --git a/fs/post_read_process.c b/fs/post_read_process.c index d203fc263091..b60be77c7217 100644 --- a/fs/post_read_process.c +++ b/fs/post_read_process.c @@ -86,7 +86,9 @@ struct bio_post_read_ctx *get_bio_post_read_ctx(struct inode *inode, post_read_steps |= 1 << STEP_DECRYPT; #ifdef CONFIG_FS_VERITY if (inode->i_verity_info != NULL && - (index < ((i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT))) + ((inode->i_sb->s_vop->verity_required + && inode->i_sb->s_vop->verity_required(inode, index)) + || (inode->i_sb->s_vop->verity_required == NULL))) post_read_steps |= 1 << STEP_VERITY; #endif if (post_read_steps) { diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h index 7c33b42abf1b..b83712d6c79a 100644 --- a/include/linux/fsverity.h +++ b/include/linux/fsverity.h @@ -18,6 +18,7 @@ struct fsverity_operations { int (*set_verity)(struct inode *inode, loff_t data_i_size); int (*get_metadata_end)(struct inode *inode, loff_t *metadata_end_ret); struct page *(*read_metadata_page)(struct inode *inode, pgoff_t index); + bool (*verity_required)(struct inode *inode, pgoff_t index); }; #ifdef CONFIG_FS_VERITY