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Mon, 6 Dec 2021 17:26:09 +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 v3 15/16] ima: Move dentries into ima_namespace Date: Mon, 6 Dec 2021 12:25:59 -0500 Message-Id: <20211206172600.1495968-16-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211206172600.1495968-1-stefanb@linux.ibm.com> References: <20211206172600.1495968-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: _NOCpz-9y1Q3VnAECIt8_p6uewPAFYiV X-Proofpoint-GUID: zfW4qNSwQk8p1-qjz4RbIlwARJCUmwUb 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=2021-12-06_06,2021-12-06_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112060104 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@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 889e9c70cbfb..bfb978a7f8d5 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 68f2e58c3917..c2a886c00ac2 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -359,14 +359,6 @@ 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, }; @@ -436,8 +428,8 @@ 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) @@ -454,58 +446,72 @@ 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_fs_ns_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_fs_ns_init(&init_user_ns); +}