From patchwork Wed Apr 24 04:37:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 10914007 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 4C7501390 for ; Wed, 24 Apr 2019 04:37:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3C211289F1 for ; Wed, 24 Apr 2019 04:37:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 307CE28A2D; Wed, 24 Apr 2019 04:37:02 +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 BBF86289F1 for ; Wed, 24 Apr 2019 04:37:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725919AbfDXEhB (ORCPT ); Wed, 24 Apr 2019 00:37:01 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:55310 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726452AbfDXEhB (ORCPT ); Wed, 24 Apr 2019 00:37:01 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3O4XRxA143786 for ; Wed, 24 Apr 2019 00:37:00 -0400 Received: from e16.ny.us.ibm.com (e16.ny.us.ibm.com [129.33.205.206]) by mx0a-001b2d01.pphosted.com with ESMTP id 2s2gttg6w5-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 24 Apr 2019 00:37:00 -0400 Received: from localhost by e16.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 24 Apr 2019 05:36:55 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3O4asTw13434948 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Apr 2019 04:36:54 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 80AEFB2066; Wed, 24 Apr 2019 04:36:54 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C2D7B205F; Wed, 24 Apr 2019 04:36:51 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.81.252]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 24 Apr 2019 04:36:50 +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: [PATCH V1 03/14] fsverity: Add call back to decide if verity check has to be performed Date: Wed, 24 Apr 2019 10:07:19 +0530 X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190424043730.13683-1-chandan@linux.ibm.com> References: <20190424043730.13683-1-chandan@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19042404-0072-0000-0000-0000041E262D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010984; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000285; SDB=6.01193533; UDB=6.00625685; IPR=6.00974357; MB=3.00026570; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-24 04:36:58 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19042404-0073-0000-0000-00004BEFFBAC Message-Id: <20190424043730.13683-4-chandan@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-24_02:,, 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-1904240038 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/f2fs/super.c | 6 ++++++ fs/post_read_process.c | 4 +++- include/linux/fsverity.h | 1 + 4 files changed, 16 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/f2fs/super.c b/fs/f2fs/super.c index 2f75f06c784a..cd1299e1f92d 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -2257,10 +2257,16 @@ static struct page *f2fs_read_verity_metadata_page(struct inode *inode, return read_mapping_page(inode->i_mapping, index, NULL); } +static bool f2fs_verity_required(struct inode *inode, pgoff_t index) +{ + return index < (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; +} + static const struct fsverity_operations f2fs_verityops = { .set_verity = f2fs_set_verity, .get_metadata_end = f2fs_get_verity_metadata_end, .read_metadata_page = f2fs_read_verity_metadata_page, + .verity_required = f2fs_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