From patchwork Wed Dec 8 22:18:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 12665361 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 C4386C433FE for ; Wed, 8 Dec 2021 22:19:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240918AbhLHWW6 (ORCPT ); Wed, 8 Dec 2021 17:22:58 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:56384 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240652AbhLHWWO (ORCPT ); Wed, 8 Dec 2021 17:22:14 -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 1B8KWk3D007982; 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=Weg+BScQ/YIvJDRzpW1unXil0QAp1MLwLekiK99Rzq4=; b=fNxqOcRPfHCqqTihUFLzlkHBIvKQnDuVvem8nj1N3XU4d+Us0u3rhvtUfSRt4POUGhhR nIlvQA8WVCTdpuFRfTBnAXwnld2Hc5mfk86Dfk5EH6F/YrqDXUMSh0OXCbtVoBfgGlKM h0WIVndG9B8nBrO5i4ZoCVQMncu+IjpMLcw7L+d498813AIV/S03xyzxVCsRK1wTFfxb 0+LVfBlnSvsGs+voS1hdvRXji3akYh/UwwCpTJ6g/XTkD3loxdK2U5YQH/hk3mgGwQKv QuqYMnBZZ4zJBTMXutSId/4LWdzQDDRKHOAHo8kBLjjhzd3xEoiRX1l1H+NhdXcYq1FH pA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cu3b9j99v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Dec 2021 22:18:28 +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 1B8MIRhY009499; Wed, 8 Dec 2021 22:18:27 GMT Received: from ppma04wdc.us.ibm.com (1a.90.2fa9.ip4.static.sl-reverse.com [169.47.144.26]) by mx0a-001b2d01.pphosted.com with ESMTP id 3cu3b9j99g-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 (ppma04wdc.us.ibm.com [127.0.0.1]) by ppma04wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1B8MDuxC031851; Wed, 8 Dec 2021 22:18:26 GMT Received: from b01cxnp22036.gho.pok.ibm.com (b01cxnp22036.gho.pok.ibm.com [9.57.198.26]) by ppma04wdc.us.ibm.com with ESMTP id 3cqyybbj04-1 (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 1B8MIP0315139126 (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 50C2D2805A; 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 3378828066; 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 13/16] ima: Move some IMA policy and filesystem related variables into ima_namespace Date: Wed, 8 Dec 2021 17:18:15 -0500 Message-Id: <20211208221818.1519628-14-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 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 4HtyX-JkS_unTf2HbqqMnLhjSVZMjhK5 X-Proofpoint-GUID: KWQrjHecCksn4XuRY_wlMgYvbtoQziFi 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 spamscore=0 suspectscore=0 bulkscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 clxscore=1015 mlxlogscore=999 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112080121 Precedence: bulk List-ID: Move the ima_write_mutex, ima_fs_flag, and valid_policy variables into ima_namespace. This way each IMA namespace can set those variables independently. Signed-off-by: Stefan Berger --- include/linux/ima.h | 5 ++++ security/integrity/ima/ima_fs.c | 32 +++++++++++------------- security/integrity/ima/ima_init_ima_ns.c | 4 +++ 3 files changed, 23 insertions(+), 18 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index 2ce801bfc449..3aaf6e806db4 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -261,6 +261,11 @@ struct ima_namespace { struct ima_h_table ima_htable; struct list_head ima_measurements; unsigned long binary_runtime_size; + + /* IMA's filesystem */ + struct mutex ima_write_mutex; + unsigned long ima_fs_flags; + int valid_policy; }; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 38b1c26479b3..0e582ceecc7f 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -25,8 +25,6 @@ #include "ima.h" -static DEFINE_MUTEX(ima_write_mutex); - bool ima_canonical_fmt; static int __init default_canonical_fmt_setup(char *str) { @@ -37,8 +35,6 @@ static int __init default_canonical_fmt_setup(char *str) } __setup("ima_canonical_fmt", default_canonical_fmt_setup); -static int valid_policy = 1; - static ssize_t ima_show_htable_value(char __user *buf, size_t count, loff_t *ppos, atomic_long_t *val) { @@ -339,7 +335,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, goto out; } - result = mutex_lock_interruptible(&ima_write_mutex); + result = mutex_lock_interruptible(&ns->ima_write_mutex); if (result < 0) goto out_free; @@ -354,12 +350,12 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, } else { result = ima_parse_add_rule(ns, data); } - mutex_unlock(&ima_write_mutex); + mutex_unlock(&ns->ima_write_mutex); out_free: kfree(data); out: if (result < 0) - valid_policy = 0; + ns->valid_policy = 0; return result; } @@ -376,8 +372,6 @@ enum ima_fs_flags { IMA_FS_BUSY, }; -static unsigned long ima_fs_flags; - #ifdef CONFIG_IMA_READ_POLICY static const struct seq_operations ima_policy_seqops = { .start = ima_policy_start, @@ -392,6 +386,8 @@ static const struct seq_operations ima_policy_seqops = { */ static int ima_open_policy(struct inode *inode, struct file *filp) { + struct ima_namespace *ns = get_current_ns(); + if (!(filp->f_flags & O_WRONLY)) { #ifndef CONFIG_IMA_READ_POLICY return -EACCES; @@ -403,7 +399,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp) return seq_open(filp, &ima_policy_seqops); #endif } - if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags)) + if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags)) return -EBUSY; return 0; } @@ -417,25 +413,25 @@ static int ima_open_policy(struct inode *inode, struct file *filp) */ static int ima_release_policy(struct inode *inode, struct file *file) { - const char *cause = valid_policy ? "completed" : "failed"; struct ima_namespace *ns = get_current_ns(); + const char *cause = ns->valid_policy ? "completed" : "failed"; if ((file->f_flags & O_ACCMODE) == O_RDONLY) return seq_release(inode, file); - if (valid_policy && ima_check_policy(ns) < 0) { + if (ns->valid_policy && ima_check_policy(ns) < 0) { cause = "failed"; - valid_policy = 0; + ns->valid_policy = 0; } pr_info("policy update %s\n", cause); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, - "policy_update", cause, !valid_policy, 0); + "policy_update", cause, !ns->valid_policy, 0); - if (!valid_policy) { + if (!ns->valid_policy) { ima_delete_rules(ns); - valid_policy = 1; - clear_bit(IMA_FS_BUSY, &ima_fs_flags); + ns->valid_policy = 1; + clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); return 0; } @@ -444,7 +440,7 @@ static int ima_release_policy(struct inode *inode, struct file *file) securityfs_remove(ima_policy); ima_policy = NULL; #elif defined(CONFIG_IMA_WRITE_POLICY) - clear_bit(IMA_FS_BUSY, &ima_fs_flags); + clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) inode->i_mode &= ~S_IWUSR; #endif diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index b097aad7b156..162c94e06d13 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -49,6 +49,10 @@ int ima_init_namespace(struct ima_namespace *ns) else ns->binary_runtime_size = ULONG_MAX; + mutex_init(&ns->ima_write_mutex); + ns->valid_policy = 1; + ns->ima_fs_flags = 0; + return 0; }