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Tue, 4 Jan 2022 17:04:30 +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 v8 13/19] ima: Add functions for creation and freeing of an ima_namespace Date: Tue, 4 Jan 2022 12:04:10 -0500 Message-Id: <20220104170416.1923685-14-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220104170416.1923685-1-stefanb@linux.vnet.ibm.com> References: <20220104170416.1923685-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: X6YixlZhxST5Xa7nT_nJvGlryUO5S-_9 X-Proofpoint-GUID: Y-hR78WR2Ux_0vlQR06OJ-oXLmu5ISjq 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=2022-01-04_08,2022-01-04_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 mlxscore=0 clxscore=1015 impostorscore=0 spamscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201040114 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org From: Stefan Berger Implement create_ima_ns() to create and initialize an ima_namespace and implement free_ima_ns() to free it. Signed-off-by: Stefan Berger --- include/linux/ima.h | 13 +++++ security/integrity/ima/Makefile | 1 + security/integrity/ima/ima.h | 16 +++++++ security/integrity/ima/ima_init_ima_ns.c | 2 +- security/integrity/ima/ima_ns.c | 61 ++++++++++++++++++++++++ 5 files changed, 92 insertions(+), 1 deletion(-) create mode 100644 security/integrity/ima/ima_ns.c diff --git a/include/linux/ima.h b/include/linux/ima.h index e1d65162d1fb..06c88cb17b21 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -226,4 +226,17 @@ static inline bool ima_appraise_signature(enum kernel_read_file_id func) return false; } #endif /* CONFIG_IMA_APPRAISE && CONFIG_INTEGRITY_TRUSTED_KEYRING */ + +#ifdef CONFIG_IMA_NS + +void free_ima_ns(struct user_namespace *ns); + +#else + +static inline void free_ima_ns(struct user_namespace *user_ns) +{ +} + +#endif /* CONFIG_IMA_NS */ + #endif /* _LINUX_IMA_H */ diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile index f8a5e5f3975d..b86a35fbed60 100644 --- a/security/integrity/ima/Makefile +++ b/security/integrity/ima/Makefile @@ -14,6 +14,7 @@ ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o ima-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o ima-$(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) += ima_asymmetric_keys.o ima-$(CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS) += ima_queue_keys.o +ima-$(CONFIG_IMA_NS) += ima_ns.o ifeq ($(CONFIG_EFI),y) ima-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_efi.o diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index f63c6f22b853..4255301e5b96 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -163,6 +163,7 @@ extern bool ima_canonical_fmt; int ima_init(void); int ima_fs_init(void); int ima_ns_init(void); +int ima_init_namespace(struct ima_namespace *ns); int ima_add_template_entry(struct ima_namespace *ns, struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, @@ -503,4 +504,19 @@ static inline struct ima_namespace *get_current_ns(void) return &init_ima_ns; } +#ifdef CONFIG_IMA_NS + +struct ima_namespace *create_ima_ns(struct user_namespace *user_ns); + +#else + +static inline struct ima_namespace * +create_ima_ns(struct user_namespace *user_ns) +{ + WARN(1, "Cannot create an IMA namespace\n"); + return ERR_PTR(-EFAULT); +} + +#endif /* CONFIG_IMA_NS */ + #endif /* __LINUX_IMA_H */ diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c index 68671f976756..6eac998781c3 100644 --- a/security/integrity/ima/ima_init_ima_ns.c +++ b/security/integrity/ima/ima_init_ima_ns.c @@ -8,7 +8,7 @@ #include "ima.h" -static int ima_init_namespace(struct ima_namespace *ns) +int ima_init_namespace(struct ima_namespace *ns) { INIT_LIST_HEAD(&ns->ima_default_rules); INIT_LIST_HEAD(&ns->ima_policy_rules); diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c new file mode 100644 index 000000000000..675466d292e8 --- /dev/null +++ b/security/integrity/ima/ima_ns.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016-2021 IBM Corporation + * Author: + * Yuqiong Sun + * Stefan Berger + */ + +#include + +#include "ima.h" + +static struct kmem_cache *imans_cachep; + +struct ima_namespace *create_ima_ns(struct user_namespace *user_ns) +{ + struct ima_namespace *ns; + int err; + + ns = kmem_cache_zalloc(imans_cachep, GFP_KERNEL); + if (!ns) + return ERR_PTR(-ENOMEM); + pr_debug("NEW ima_ns: %p\n", ns); + + err = ima_init_namespace(ns); + if (err) + goto fail_free; + + user_ns->ima_ns = ns; + + return ns; + +fail_free: + kmem_cache_free(imans_cachep, ns); + + return ERR_PTR(err); +} + +static void destroy_ima_ns(struct ima_namespace *ns) +{ + pr_debug("DESTROY ima_ns: %p\n", ns); + ima_free_policy_rules(ns); + kmem_cache_free(imans_cachep, ns); +} + +void free_ima_ns(struct user_namespace *user_ns) +{ + struct ima_namespace *ns = user_ns->ima_ns; + + if (!ns || WARN_ON(ns == &init_ima_ns)) + return; + + destroy_ima_ns(ns); +} + +static int __init imans_cache_init(void) +{ + imans_cachep = KMEM_CACHE(ima_namespace, SLAB_PANIC); + return 0; +} +subsys_initcall(imans_cache_init)