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Thu, 7 Jul 2022 14:48:06 +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, jpenumak@redhat.com, Stefan Berger , Christian Brauner Subject: [PATCH v13 16/26] ima: Add functions for creating and freeing of an ima_namespace Date: Thu, 7 Jul 2022 10:47:50 -0400 Message-Id: <20220707144800.828288-17-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220707144800.828288-1-stefanb@linux.ibm.com> References: <20220707144800.828288-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: c1yhioQrRiimOJtGJJPbQ5a2_QS6tDHg X-Proofpoint-ORIG-GUID: 3rdCVdEQaPZWEkk4lHrQK31rlGm9D9YK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-07_12,2022-06-28_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 spamscore=0 clxscore=1015 malwarescore=0 mlxscore=0 impostorscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207070057 Precedence: bulk List-ID: Implement create_ima_ns() to create an empty ima_namespace. Defer its initialization to a later point outside this function. Implement free_ima_ns() to free it. Signed-off-by: Stefan Berger Acked-by: Christian Brauner Reviewed-by: Mimi Zohar Acked-by: Serge Hallyn --- v9: - Set user_ns->ims_ns = NULL in free_ima_ns() - Refactored create_ima_ns() to defer initialization - Removed pr_debug functions --- include/linux/ima.h | 13 ++++++ security/integrity/ima/Makefile | 1 + security/integrity/ima/ima.h | 15 +++++++ security/integrity/ima/ima_init_ima_ns.c | 2 +- security/integrity/ima/ima_ns.c | 53 ++++++++++++++++++++++++ 5 files changed, 83 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 fcb60a44e05f..76d19995ab89 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -220,4 +220,17 @@ 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 528d792c82c1..b4e1170bc170 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -171,6 +171,7 @@ 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, @@ -506,4 +507,18 @@ static inline struct ima_namespace return NULL; } +#ifdef CONFIG_IMA_NS + +struct ima_namespace *create_ima_ns(void); + +#else + +static inline struct ima_namespace *create_ima_ns(void) +{ + 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 c4fe8f3e9a73..b497062090cf 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) { int ret; diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c new file mode 100644 index 000000000000..b3b81a1e313e --- /dev/null +++ b/security/integrity/ima/ima_ns.c @@ -0,0 +1,53 @@ +// 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(void) +{ + struct ima_namespace *ns; + + ns = kmem_cache_zalloc(imans_cachep, GFP_KERNEL); + if (!ns) + return ERR_PTR(-ENOMEM); + + return ns; +} + +/* destroy_ima_ns() must only be called after ima_init_namespace() was called */ +static void destroy_ima_ns(struct ima_namespace *ns) +{ + unregister_blocking_lsm_notifier(&ns->ima_lsm_policy_notifier); + kfree(ns->arch_policy_entry); + ima_free_policy_rules(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); + + kmem_cache_free(imans_cachep, ns); + + user_ns->ima_ns = NULL; +} + +static int __init imans_cache_init(void) +{ + imans_cachep = KMEM_CACHE(ima_namespace, SLAB_PANIC); + return 0; +} +subsys_initcall(imans_cache_init)