From patchwork Mon Sep 4 13:40:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 13374020 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 9A1A4CA0FF3 for ; Mon, 4 Sep 2023 13:43:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344235AbjIDNnC (ORCPT ); Mon, 4 Sep 2023 09:43:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43270 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353136AbjIDNm5 (ORCPT ); Mon, 4 Sep 2023 09:42:57 -0400 Received: from frasgout12.his.huawei.com (unknown [14.137.139.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DD941981; Mon, 4 Sep 2023 06:42:30 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.18.147.227]) by frasgout12.his.huawei.com (SkyGuard) with ESMTP id 4RfTwL1PD6z9xGYt; Mon, 4 Sep 2023 21:28:02 +0800 (CST) Received: from huaweicloud.com (unknown [10.204.63.22]) by APP1 (Coremail) with SMTP id LxC2BwCXSblt3vVkorkeAg--.30599S6; Mon, 04 Sep 2023 14:42:01 +0100 (CET) From: Roberto Sassu To: viro@zeniv.linux.org.uk, brauner@kernel.org, chuck.lever@oracle.com, jlayton@kernel.org, neilb@suse.de, kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com, zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, dhowells@redhat.com, jarkko@kernel.org, stephen.smalley.work@gmail.com, eparis@parisplace.org, casey@schaufler-ca.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, selinux@vger.kernel.org, Roberto Sassu Subject: [PATCH v3 24/25] integrity: Move integrity functions to the LSM infrastructure Date: Mon, 4 Sep 2023 15:40:48 +0200 Message-Id: <20230904134049.1802006-5-roberto.sassu@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230904133415.1799503-1-roberto.sassu@huaweicloud.com> References: <20230904133415.1799503-1-roberto.sassu@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: LxC2BwCXSblt3vVkorkeAg--.30599S6 X-Coremail-Antispam: 1UD129KBjvJXoW3AF13XF1xGFWxAFyxGFyfWFg_yoW7Ar15pF srKayUGrn5ZFyIkFWkAF13ua1fK3yqgrW7Wws8Cw1ktFyqvr10qF4DJry5uFy3WrWrtr1I qrsIgr1UCw1DtrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBIb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVWxJr0_GcWl84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxVAF wI0_Cr1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7 xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Y z7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r4a6rW5MIIYrxkI7VAKI48JMIIF0x vE2Ix0cI8IcVAFwI0_Xr0_Ar1lIxAIcVC0I7IYx2IY6xkF7I0E14v26F4UJVW0owCI42IY 6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aV CY1x0267AKxVWxJr0_GcJvcSsGvfC2KfnxnUUI43ZEXa7IUbGXdUUUUUU== X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAgAKBF1jj4+BZAABsW X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org From: Roberto Sassu Remove hardcoded calls to integrity functions from the LSM infrastructure. Also move the global declaration of integrity_inode_get() to security/integrity/integrity.h, so that the function can be still called by IMA. Register integrity functions as hook implementations in integrity_lsm_init(). Signed-off-by: Roberto Sassu Reviewed-by: Casey Schaufler --- include/linux/integrity.h | 26 -------------------------- security/integrity/iint.c | 11 ++++++++++- security/integrity/integrity.h | 7 +++++++ security/security.c | 9 +-------- 4 files changed, 18 insertions(+), 35 deletions(-) diff --git a/include/linux/integrity.h b/include/linux/integrity.h index 2ea0f2f65ab6..afaae7ad26f4 100644 --- a/include/linux/integrity.h +++ b/include/linux/integrity.h @@ -21,38 +21,12 @@ enum integrity_status { /* List of EVM protected security xattrs */ #ifdef CONFIG_INTEGRITY -extern struct integrity_iint_cache *integrity_inode_get(struct inode *inode); -extern void integrity_inode_free(struct inode *inode); extern void __init integrity_load_keys(void); #else -static inline struct integrity_iint_cache * - integrity_inode_get(struct inode *inode) -{ - return NULL; -} - -static inline void integrity_inode_free(struct inode *inode) -{ - return; -} - static inline void integrity_load_keys(void) { } #endif /* CONFIG_INTEGRITY */ -#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS - -extern int integrity_kernel_module_request(char *kmod_name); - -#else - -static inline int integrity_kernel_module_request(char *kmod_name) -{ - return 0; -} - -#endif /* CONFIG_INTEGRITY_ASYMMETRIC_KEYS */ - #endif /* _LINUX_INTEGRITY_H */ diff --git a/security/integrity/iint.c b/security/integrity/iint.c index dd03f978b45c..70ee803a33ea 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -138,7 +138,7 @@ struct integrity_iint_cache *integrity_inode_get(struct inode *inode) * * Free the integrity information(iint) associated with an inode. */ -void integrity_inode_free(struct inode *inode) +static void integrity_inode_free(struct inode *inode) { struct integrity_iint_cache *iint; @@ -167,12 +167,21 @@ static void init_once(void *foo) mutex_init(&iint->mutex); } +static struct security_hook_list integrity_hooks[] __ro_after_init = { + LSM_HOOK_INIT(inode_free_security, integrity_inode_free), +#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS + LSM_HOOK_INIT(kernel_module_request, integrity_kernel_module_request), +#endif +}; + static int __init integrity_lsm_init(void) { iint_cache = kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache), 0, SLAB_PANIC, init_once); + security_add_hooks(integrity_hooks, ARRAY_SIZE(integrity_hooks), + "integrity"); init_ima_lsm(); init_evm_lsm(); return 0; diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 83a465ac9013..e020c365997b 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -178,6 +178,7 @@ struct integrity_iint_cache { * integrity data associated with an inode. */ struct integrity_iint_cache *integrity_iint_find(struct inode *inode); +struct integrity_iint_cache *integrity_inode_get(struct inode *inode); int integrity_kernel_read(struct file *file, loff_t offset, void *addr, unsigned long count); @@ -251,12 +252,18 @@ static inline int __init integrity_load_cert(const unsigned int id, #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS int asymmetric_verify(struct key *keyring, const char *sig, int siglen, const char *data, int datalen); +int integrity_kernel_module_request(char *kmod_name); #else static inline int asymmetric_verify(struct key *keyring, const char *sig, int siglen, const char *data, int datalen) { return -EOPNOTSUPP; } + +static inline int integrity_kernel_module_request(char *kmod_name) +{ + return 0; +} #endif #ifdef CONFIG_IMA_APPRAISE_MODSIG diff --git a/security/security.c b/security/security.c index 5e700557e434..5f26a0c16d48 100644 --- a/security/security.c +++ b/security/security.c @@ -19,7 +19,6 @@ #include #include #include -#include #include #include #include @@ -1497,7 +1496,6 @@ static void inode_free_by_rcu(struct rcu_head *head) */ void security_inode_free(struct inode *inode) { - integrity_inode_free(inode); call_void_hook(inode_free_security, inode); /* * The inode may still be referenced in a path walk and @@ -3090,12 +3088,7 @@ int security_kernel_create_files_as(struct cred *new, struct inode *inode) */ int security_kernel_module_request(char *kmod_name) { - int ret; - - ret = call_int_hook(kernel_module_request, 0, kmod_name); - if (ret) - return ret; - return integrity_kernel_module_request(kmod_name); + return call_int_hook(kernel_module_request, 0, kmod_name); } /**