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 146D9C433EF for ; Wed, 8 Dec 2021 22:19:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240896AbhLHWX1 (ORCPT ); Wed, 8 Dec 2021 17:23:27 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:15364 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S240637AbhLHWWN (ORCPT ); Wed, 8 Dec 2021 17:22:13 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1B8LCFsw012038; Wed, 8 Dec 2021 22:18:28 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=lWf9SHsR2PkBp5VZmLFG+KU7bbZmrVh1EERQWWp9idk=; b=FPnm0GKluU3GQ5DSjA3JH+nILWdKxpK4E5Wg0y//qOnJu7K4vGC5J3dKF4EGBDqu1f+z GuCb2VFmYlYNht2yieVYdULpblc0im0IFz7zBs5fjOSxYGnUQCPbQjUfg0tW3neOKb9m bmu9sljUZxlhytrkVXNmUoSp6b0d3AciJQ4WuJsiilEpAEF8cc0eMkmKBWU7fzSFSrWd U5GFYV+9V0Z2PVKYVXmiQfi7xD5MJnl0f2zAfU+I26u4l9dCqmwCj1bgTQ3nH946Yw+g Gw4/kOEOtso+QRlb5NZv2ZTBT1ufgpB2EP1xF70KNjecAOU9phXAJLv+Isw74xuOQO5q oQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cu4dr11q1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Dec 2021 22:18:28 +0000 Received: from m0098414.ppops.net (m0098414.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1B8MELZf012934; Wed, 8 Dec 2021 22:18:27 GMT Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cu4dr11pr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Dec 2021 22:18:27 +0000 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1B8MDu59020083; Wed, 8 Dec 2021 22:18:27 GMT Received: from b01cxnp22036.gho.pok.ibm.com (b01cxnp22036.gho.pok.ibm.com [9.57.198.26]) by ppma01dal.us.ibm.com with ESMTP id 3cqyycykce-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Dec 2021 22:18:26 +0000 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1B8MIPm816646670 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 8 Dec 2021 22:18:25 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8023C28060; Wed, 8 Dec 2021 22:18:25 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 653CA2805C; Wed, 8 Dec 2021 22:18:25 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 8 Dec 2021 22:18:25 +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, Stefan Berger Subject: [PATCH v5 15/16] ima: Move dentries into ima_namespace Date: Wed, 8 Dec 2021 17:18:17 -0500 Message-Id: <20211208221818.1519628-16-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211208221818.1519628-1-stefanb@linux.ibm.com> References: <20211208221818.1519628-1-stefanb@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: smyRqOyxM3yjVtrMjxqTEyhKAcNLo_u6 X-Proofpoint-ORIG-GUID: 5XeSqDwOV7qQNV11ishVH5EivY9HJwvx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-08_08,2021-12-08_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 mlxscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 phishscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112080121 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Move the dentries into the ima_namespace for reuse by virtualized SecurityFS. Implement function freeing the dentries in order of files and symlinks before directories. Signed-off-by: Stefan Berger --- include/linux/ima.h | 13 ++++++ security/integrity/ima/ima_fs.c | 72 ++++++++++++++++++--------------- 2 files changed, 52 insertions(+), 33 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index 3aaf6e806db4..4dd64e318b15 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -220,6 +220,17 @@ struct ima_h_table { struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; }; +enum { + IMAFS_DENTRY_DIR = 0, + IMAFS_DENTRY_SYMLINK, + IMAFS_DENTRY_BINARY_RUNTIME_MEASUREMENTS, + IMAFS_DENTRY_ASCII_RUNTIME_MEASUREMENTS, + IMAFS_DENTRY_RUNTIME_MEASUREMENTS_COUNT, + IMAFS_DENTRY_VIOLATIONS, + IMAFS_DENTRY_IMA_POLICY, + IMAFS_DENTRY_LAST +}; + struct ima_namespace { struct kref kref; struct user_namespace *user_ns; @@ -266,6 +277,8 @@ struct ima_namespace { struct mutex ima_write_mutex; unsigned long ima_fs_flags; int valid_policy; + + struct dentry *dentry[IMAFS_DENTRY_LAST]; }; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index a749a3e79304..3810d11fb463 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -360,14 +360,6 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, return result; } -static struct dentry *ima_dir; -static struct dentry *ima_symlink; -static struct dentry *binary_runtime_measurements; -static struct dentry *ascii_runtime_measurements; -static struct dentry *runtime_measurements_count; -static struct dentry *violations; -static struct dentry *ima_policy; - enum ima_fs_flags { IMA_FS_BUSY, }; @@ -437,8 +429,8 @@ static int ima_release_policy(struct inode *inode, struct file *file) ima_update_policy(ns); #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY) - securityfs_remove(ima_policy); - ima_policy = NULL; + securityfs_remove(ns->dentry[IMAFS_DENTRY_IMA_POLICY]); + ns->dentry[IMAFS_DENTRY_IMA_POLICY] = NULL; #elif defined(CONFIG_IMA_WRITE_POLICY) clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) @@ -455,58 +447,72 @@ static const struct file_operations ima_measure_policy_ops = { .llseek = generic_file_llseek, }; -int __init ima_fs_init(void) +static void ima_fs_ns_free_dentries(struct ima_namespace *ns) { - ima_dir = securityfs_create_dir("ima", integrity_dir); - if (IS_ERR(ima_dir)) + int i; + + for (i = IMAFS_DENTRY_LAST - 1; i >= 0; i--) + securityfs_remove(ns->dentry[i]); + + memset(ns->dentry, 0, sizeof(ns->dentry)); +} + +static int __init ima_securityfs_init(struct user_namespace *user_ns) +{ + struct ima_namespace *ns = user_ns->ima_ns; + struct dentry *ima_dir; + + ns->dentry[IMAFS_DENTRY_DIR] = securityfs_create_dir("ima", integrity_dir); + if (IS_ERR(ns->dentry[IMAFS_DENTRY_DIR])) return -1; + ima_dir = ns->dentry[IMAFS_DENTRY_DIR]; - ima_symlink = securityfs_create_symlink("ima", NULL, "integrity/ima", - NULL); - if (IS_ERR(ima_symlink)) + ns->dentry[IMAFS_DENTRY_SYMLINK] = + securityfs_create_symlink("ima", NULL, "integrity/ima", NULL); + if (IS_ERR(ns->dentry[IMAFS_DENTRY_SYMLINK])) goto out; - binary_runtime_measurements = + ns->dentry[IMAFS_DENTRY_BINARY_RUNTIME_MEASUREMENTS] = securityfs_create_file("binary_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_measurements_ops); - if (IS_ERR(binary_runtime_measurements)) + if (IS_ERR(ns->dentry[IMAFS_DENTRY_BINARY_RUNTIME_MEASUREMENTS])) goto out; - ascii_runtime_measurements = + ns->dentry[IMAFS_DENTRY_ASCII_RUNTIME_MEASUREMENTS] = securityfs_create_file("ascii_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_ascii_measurements_ops); - if (IS_ERR(ascii_runtime_measurements)) + if (IS_ERR(ns->dentry[IMAFS_DENTRY_ASCII_RUNTIME_MEASUREMENTS])) goto out; - runtime_measurements_count = + ns->dentry[IMAFS_DENTRY_RUNTIME_MEASUREMENTS_COUNT] = securityfs_create_file("runtime_measurements_count", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_measurements_count_ops); - if (IS_ERR(runtime_measurements_count)) + if (IS_ERR(ns->dentry[IMAFS_DENTRY_RUNTIME_MEASUREMENTS_COUNT])) goto out; - violations = + ns->dentry[IMAFS_DENTRY_VIOLATIONS] = securityfs_create_file("violations", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_htable_violations_ops); - if (IS_ERR(violations)) + if (IS_ERR(ns->dentry[IMAFS_DENTRY_VIOLATIONS])) goto out; - ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS, + ns->dentry[IMAFS_DENTRY_IMA_POLICY] = + securityfs_create_file("policy", POLICY_FILE_FLAGS, ima_dir, NULL, &ima_measure_policy_ops); - if (IS_ERR(ima_policy)) + if (IS_ERR(ns->dentry[IMAFS_DENTRY_IMA_POLICY])) goto out; return 0; out: - securityfs_remove(violations); - securityfs_remove(runtime_measurements_count); - securityfs_remove(ascii_runtime_measurements); - securityfs_remove(binary_runtime_measurements); - securityfs_remove(ima_symlink); - securityfs_remove(ima_dir); - securityfs_remove(ima_policy); + ima_fs_ns_free_dentries(ns); return -1; } + +int __init ima_fs_init(void) +{ + return ima_securityfs_init(&init_user_ns); +} -- 2.31.1