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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2FADC4332F for ; Thu, 16 Dec 2021 05:44:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233872AbhLPFoN (ORCPT ); Thu, 16 Dec 2021 00:44:13 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:59276 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233820AbhLPFoA (ORCPT ); Thu, 16 Dec 2021 00:44:00 -0500 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1BG4UrQh018664; Thu, 16 Dec 2021 05:43:47 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=WZTt5N+m24l3rB3fSDkkd5mvrbAxssRN3e1Z6VuINmQ=; b=FAYJwRQP+jG65NAZlJwZwYN8EfLNKu+qeFFdu0qIxD4oCP9EeATAnSHU0cqCIfzWFBHe bTUld9G+KBNC/+4yhVjib+BIOU2mlsTNIxzRFZnDZYELmjYFFL8yllBxUM+sQKkrCNUo 9He982mDbBQboi05ZaupgkaKX3wJ69k1lbbSPGJ/0BzrM5I04zkwtdvdRt49AyzHzG/Q /a5drCFieokGM6ElHQ+jlpxa9r5z57lH2pB0Rm0q8ztmUOq4D1AVNwui6Ewhmc5NjSd1 ncXUnRdF3+8ULi2UxWF4UUYip13bJYSr891Z01lYeJ7VV3LIk3agehULAi/gNe4WBrPc UQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cyn1jm9ak-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 16 Dec 2021 05:43:47 +0000 Received: from m0098409.ppops.net (m0098409.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1BG50el1007800; Thu, 16 Dec 2021 05:43:46 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 3cyn1jm9aa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 16 Dec 2021 05:43:46 +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 1BG5fvVJ032291; Thu, 16 Dec 2021 05:43:45 GMT Received: from b03cxnp08028.gho.boulder.ibm.com (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20]) by ppma04dal.us.ibm.com with ESMTP id 3cy7hf9bsc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 16 Dec 2021 05:43:45 +0000 Received: from b03ledav001.gho.boulder.ibm.com (b03ledav001.gho.boulder.ibm.com [9.17.130.232]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1BG5hhnc31785366 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Dec 2021 05:43:43 GMT Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C51C96E053; Thu, 16 Dec 2021 05:43:43 +0000 (GMT) Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A26346E052; Thu, 16 Dec 2021 05:43:42 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 16 Dec 2021 05:43:42 +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 , James Bottomley Subject: [PATCH v7 14/14] ima: Setup securityfs for IMA namespace Date: Thu, 16 Dec 2021 00:43:23 -0500 Message-Id: <20211216054323.1707384-15-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211216054323.1707384-1-stefanb@linux.vnet.ibm.com> References: <20211216054323.1707384-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Sc4s3QC2UR58vrd4hIX3JvLoWYd3q0B6 X-Proofpoint-GUID: 1ao4xZzJj2v9K4_cmHTZGy5udDvbQHip 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=2021-12-16_01,2021-12-14_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 clxscore=1015 malwarescore=0 spamscore=0 mlxscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112160033 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org From: Stefan Berger Setup securityfs with symlinks, directories, and files for IMA namespacing support. The same directory structure that IMA uses on the host is also created for the namespacing case. The securityfs file and directory ownerships cannot be set when the IMA namespace is initialized. Therefore, delay the setup of the file system to a later point when securityfs is in securityfs_fill_super. This filesystem can now be mounted as follows: mount -t securityfs /sys/kernel/security/ /sys/kernel/security/ The following directories, symlinks, and files are then available. $ ls -l sys/kernel/security/ total 0 lr--r--r--. 1 root root 0 Dec 2 00:18 ima -> integrity/ima drwxr-xr-x. 3 root root 0 Dec 2 00:18 integrity $ ls -l sys/kernel/security/ima/ total 0 -r--r-----. 1 root root 0 Dec 2 00:18 ascii_runtime_measurements -r--r-----. 1 root root 0 Dec 2 00:18 binary_runtime_measurements -rw-------. 1 root root 0 Dec 2 00:18 policy -r--r-----. 1 root root 0 Dec 2 00:18 runtime_measurements_count -r--r-----. 1 root root 0 Dec 2 00:18 violations Signed-off-by: Stefan Berger Signed-off-by: James Bottomley --- include/linux/ima.h | 14 ++++++++++++ security/inode.c | 6 ++++- security/integrity/ima/ima.h | 1 + security/integrity/ima/ima_fs.c | 40 ++++++++++++++++++++++++--------- 4 files changed, 49 insertions(+), 12 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index f9e592bb9560..a2705aa5242a 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -40,6 +40,7 @@ extern int ima_measure_critical_data(const char *event_label, const char *event_name, const void *buf, size_t buf_len, bool hash, u8 *digest, size_t digest_len); +extern int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root); #ifdef CONFIG_IMA_APPRAISE_BOOTPARAM extern void ima_appraise_parse_cmdline(void); @@ -232,6 +233,12 @@ static inline struct ima_namespace *get_current_ns(void) return current_user_ns()->ima_ns; } +static inline int ima_securityfs_init(struct user_namespace *user_ns, + struct dentry *root) +{ + return ima_fs_ns_init(user_ns, root); +} + #else static inline void free_ima_ns(struct user_namespace *user_ns) @@ -250,6 +257,13 @@ static inline struct ima_namespace *get_current_ns(void) { return &init_ima_ns; } + +static inline int ima_securityfs_init(struct user_namespace *ns, + struct dentry *root) +{ + return 0; +} + #endif /* CONFIG_IMA_NS */ #if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING) diff --git a/security/inode.c b/security/inode.c index a0d9f086e3d5..ad9395d121f2 100644 --- a/security/inode.c +++ b/security/inode.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -77,7 +78,10 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_op = &securityfs_super_operations; sb->s_root->d_inode->i_op = &securityfs_dir_inode_operations; - return 0; + if (ns != &init_user_ns) + error = ima_securityfs_init(ns, sb->s_root); + + return error; } static int securityfs_get_tree(struct fs_context *fc) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index d51703290e25..9b0f6a3763f9 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -148,6 +148,7 @@ struct ima_namespace { int valid_policy; struct dentry *policy_dentry; + bool policy_dentry_removed; } __randomize_layout; extern const int read_idmap[]; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 7c5a721f4f3d..3b8001ba62e3 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -431,6 +431,7 @@ static int ima_release_policy(struct inode *inode, struct file *file) #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY) securityfs_remove(ns->policy_dentry); ns->policy_dentry = NULL; + ns->policy_dentry_removed = true; #elif defined(CONFIG_IMA_WRITE_POLICY) clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) @@ -447,21 +448,31 @@ static const struct file_operations ima_measure_policy_ops = { .llseek = generic_file_llseek, }; -static int __init ima_fs_ns_init(struct user_namespace *user_ns) +int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root) { struct ima_namespace *ns = user_ns->ima_ns; - struct dentry *ima_dir; + struct dentry *int_dir; + struct dentry *ima_dir = NULL; struct dentry *ima_symlink = NULL; struct dentry *binary_runtime_measurements = NULL; struct dentry *ascii_runtime_measurements = NULL; struct dentry *runtime_measurements_count = NULL; struct dentry *violations = NULL; - ima_dir = securityfs_create_dir("ima", integrity_dir); + /* FIXME: update when evm and integrity are namespaced */ + if (user_ns != &init_user_ns) { + int_dir = + securityfs_create_dir("integrity", root); + if (IS_ERR(int_dir)) + return -1; + } else + int_dir = integrity_dir; + + ima_dir = securityfs_create_dir("ima", int_dir); if (IS_ERR(ima_dir)) - return -1; + goto out; - ima_symlink = securityfs_create_symlink("ima", NULL, "integrity/ima", + ima_symlink = securityfs_create_symlink("ima", root, "integrity/ima", NULL); if (IS_ERR(ima_symlink)) goto out; @@ -493,11 +504,15 @@ static int __init ima_fs_ns_init(struct user_namespace *user_ns) if (IS_ERR(violations)) goto out; - ns->policy_dentry = securityfs_create_file("policy", POLICY_FILE_FLAGS, - ima_dir, NULL, - &ima_measure_policy_ops); - if (IS_ERR(ns->policy_dentry)) - goto out; + + if (!ns->policy_dentry_removed) { + ns->policy_dentry = + securityfs_create_file("policy", POLICY_FILE_FLAGS, + ima_dir, NULL, + &ima_measure_policy_ops); + if (IS_ERR(ns->policy_dentry)) + goto out; + } return 0; out: @@ -508,10 +523,13 @@ static int __init ima_fs_ns_init(struct user_namespace *user_ns) securityfs_remove(binary_runtime_measurements); securityfs_remove(ima_symlink); securityfs_remove(ima_dir); + if (user_ns != &init_user_ns) + securityfs_remove(integrity_dir); + return -1; } int __init ima_fs_init(void) { - return ima_fs_ns_init(&init_user_ns); + return ima_fs_ns_init(&init_user_ns, NULL); } -- 2.31.1