From patchwork Wed Apr 20 14:06:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12820321 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CAC8C4167D for ; Wed, 20 Apr 2022 14:10:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347822AbiDTONM (ORCPT ); Wed, 20 Apr 2022 10:13:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57640 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379445AbiDTOLV (ORCPT ); Wed, 20 Apr 2022 10:11:21 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C577A43EDD; Wed, 20 Apr 2022 07:07:23 -0700 (PDT) Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 23KDlEIl018650; Wed, 20 Apr 2022 14:06:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=SgzSoq5xT43TolHrDde3otB79FsXGO9TTeR14lmijzg=; b=NVirgqdAd56hx3B1Urj0L6mYhuJ3je/E2LjJYTVK3bwSaWXJTG46wZTCuJ23yrBCCoSR UM5Zh8NrPt44O3DcgIG7bLp1I4ai0sAluZQ0U9C1jEIeREXZHVeQewstxFU4jKxq5Wqr vBjnozkpU84SMiX6y9c6/NGz6ZDu86HhU1JSsr7YrCLGPLJYLoACln7WEz0xPNm3TICq aW/3hskIO0yVq0LZuY99d5OcXFRpmB+P28IV0VzGDyowDUdTlZKGQVAK+pUCaRMt4qQH rdpWJNjwgeRIcN0rqV9eE0oGO7d+UyN2rQZT2AzV+6Y2KY0bZgfHN2kviBjOMDnFiX+C 2A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3fg7vpqyuh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 20 Apr 2022 14:06:43 +0000 Received: from m0098393.ppops.net (m0098393.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 23KDvM0S025280; Wed, 20 Apr 2022 14:06:43 GMT Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0a-001b2d01.pphosted.com with ESMTP id 3fg7vpqyts-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 20 Apr 2022 14:06:42 +0000 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 23KE3Cq1015554; Wed, 20 Apr 2022 14:06:41 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma04dal.us.ibm.com with ESMTP id 3ffnea3tv6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 20 Apr 2022 14:06:41 +0000 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 23KE6exb33030592 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 20 Apr 2022 14:06:40 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C3800AE062; Wed, 20 Apr 2022 14:06:40 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A374AAE060; Wed, 20 Apr 2022 14:06:40 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 20 Apr 2022 14:06:40 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, jpenumak@redhat.com, Christian Brauner , John Johansen , Matthew Garrett , Micah Morton , Kentaro Takeda , Jarkko Sakkinen , Stefan Berger Subject: [PATCH v12 01/26] securityfs: rework dentry creation Date: Wed, 20 Apr 2022 10:06:08 -0400 Message-Id: <20220420140633.753772-2-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220420140633.753772-1-stefanb@linux.ibm.com> References: <20220420140633.753772-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 6cEhuZsipT30dEp9ovxyjqVb1vHjfLKv X-Proofpoint-GUID: PA2sLHPWeg1EBhhyEf3ru90iivtPzUZN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-20_04,2022-04-20_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 mlxscore=0 phishscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2204200081 Precedence: bulk List-ID: From: Christian Brauner When securityfs creates a new file or directory via securityfs_create_dentry() it will take an additional reference on the newly created dentry after it has attached the new inode to the new dentry and added it to the hashqueues. If we contrast this with debugfs which has the same underlying logic as securityfs. It uses a similar pairing as securityfs. Where securityfs has the securityfs_create_dentry() and securityfs_remove() pairing, debugfs has the __debugfs_create_file() and debugfs_remove() pairing. In contrast to securityfs, debugfs doesn't take an additional reference on the newly created dentry in __debugfs_create_file() which would need to be put in debugfs_remove(). The additional dget() isn't a problem per se. In the current implementation of securityfs each created dentry pins the filesystem via until it is removed. Since it is virtually guaranteed that there is at least one user of securityfs that has created dentries the initial securityfs mount cannot go away until all dentries have been removed. Since most of the users of the initial securityfs mount don't go away until the system is shutdown the initial securityfs won't go away when unmounted. Instead a mount will usually surface the same superblock as before. The additional dget() doesn't matter in this scenario since it is required that all dentries have been cleaned up by the respective users before the superblock can be destroyed, i.e. superblock shutdown is tied to the lifetime of the associated dentries. However, in order to support ima namespaces we need to extend securityfs to support being mounted outside of the initial user namespace. For namespaced users the pinning logic doesn't make sense. Whereas in the initial namespace the securityfs instance and the associated data structures of its users can't go away for reason explained earlier users of non-initial securityfs instances do go away when the last users of the namespace are gone. So for those users we neither want to duplicate the pinning logic nor make the global securityfs instance display different information based on the namespace. Both options would be really messy and hacky. Instead we will simply give each namespace its own securityfs instance similar to how each ipc namespace has its own mqueue instance and all entries in there are cleaned up on umount or when the last user of the associated namespace is gone. This means that the superblock's lifetime isn't tied to the dentries. Instead the last umount, without any fds kept open, will trigger a clean shutdown. But now the additional dget() gets in the way. Instead of being able to rely on the generic superblock shutdown logic we would need to drop the additional dentry reference during superblock shutdown for all associated users. That would force the use of a generic coordination mechanism for current and future users of securityfs which is unnecessary. Simply remove the additional dget() in securityfs_dentry_create(). In securityfs_remove() we will call dget() to take an additional reference on the dentry about to be removed. After simple_unlink() or simple_rmdir() have dropped the dentry refcount we can call d_delete() which will either turn the dentry into negative dentry if our earlier dget() is the only reference to the dentry, i.e. it has no other users, or remove it from the hashqueues in case there are additional users. All of these changes should not have any effect on the userspace semantics of the initial securityfs mount. Signed-off-by: Christian Brauner Cc: John Johansen Cc: Matthew Garrett Cc: Micah Morton Cc: Kentaro Takeda Cc: James Morris Cc: Jarkko Sakkinen Signed-off-by: Stefan Berger Reviewed-by: Mimi Zohar Reviewed-by: Serge Hallyn --- security/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/inode.c b/security/inode.c index 6c326939750d..13e6780c4444 100644 --- a/security/inode.c +++ b/security/inode.c @@ -159,7 +159,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, inode->i_fop = fops; } d_instantiate(dentry, inode); - dget(dentry); inode_unlock(dir); return dentry; @@ -302,10 +301,12 @@ void securityfs_remove(struct dentry *dentry) dir = d_inode(dentry->d_parent); inode_lock(dir); if (simple_positive(dentry)) { + dget(dentry); if (d_is_dir(dentry)) simple_rmdir(dir, dentry); else simple_unlink(dir, dentry); + d_delete(dentry); dput(dentry); } inode_unlock(dir);