From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14B3DC10F14 for ; Fri, 12 Apr 2019 17:10:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E0200218A3 for ; Fri, 12 Apr 2019 17:10:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726902AbfDLRKV (ORCPT ); Fri, 12 Apr 2019 13:10:21 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:58568 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726851AbfDLRKV (ORCPT ); Fri, 12 Apr 2019 13:10:21 -0400 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3CHA0lr134076 for ; Fri, 12 Apr 2019 13:10:20 -0400 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rtwqejts7-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 12 Apr 2019 13:10:19 -0400 Received: from localhost by e34.co.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) Fri, 12 Apr 2019 18:10:15 +0100 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3CHADVC20512970 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 12 Apr 2019 17:10:14 GMT Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AF1EA6A07E; Fri, 12 Apr 2019 17:10:12 +0000 (GMT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 003066A051; Fri, 12 Apr 2019 17:10:08 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.82.25]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 12 Apr 2019 17:10:08 +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 03/14] fsverity: Add call back to decide if verity check has to be performed Date: Fri, 12 Apr 2019 22:40:30 +0530 X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190412171041.31995-1-chandan@linux.ibm.com> References: <20190412171041.31995-1-chandan@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19041217-0016-0000-0000-0000099FF724 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010914; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000284; SDB=6.01188096; UDB=6.00622386; IPR=6.00968863; MB=3.00026412; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-12 17:10:17 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19041217-0017-0000-0000-000042CA3EBC Message-Id: <20190412171041.31995-4-chandan@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-12_10:,, 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-1904120115 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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..c408184b671a 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 -- 2.19.1