From patchwork Fri Mar 3 18:18:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 13159353 X-Patchwork-Delegate: paul@paul-moore.com 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 942AEC7EE37 for ; Fri, 3 Mar 2023 18:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231469AbjCCSiQ (ORCPT ); Fri, 3 Mar 2023 13:38:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231823AbjCCSiD (ORCPT ); Fri, 3 Mar 2023 13:38:03 -0500 Received: from frasgout12.his.huawei.com (frasgout12.his.huawei.com [14.137.139.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A65496151C; Fri, 3 Mar 2023 10:37:40 -0800 (PST) Received: from mail02.huawei.com (unknown [172.18.147.227]) by frasgout12.his.huawei.com (SkyGuard) with ESMTP id 4PSwxm5nMgz9xtRT; Sat, 4 Mar 2023 02:10:36 +0800 (CST) Received: from huaweicloud.com (unknown [10.204.63.22]) by APP2 (Coremail) with SMTP id GxC2BwBnMVgKOgJk5iFpAQ--.12605S4; Fri, 03 Mar 2023 19:19:24 +0100 (CET) From: Roberto Sassu To: viro@zeniv.linux.org.uk, chuck.lever@oracle.com, jlayton@kernel.org, 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, brauner@kernel.org Cc: linux-fsdevel@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, linux-kernel@vger.kernel.org, stefanb@linux.ibm.com, Roberto Sassu Subject: [PATCH 02/28] ima: Align ima_post_path_mknod() definition with LSM infrastructure Date: Fri, 3 Mar 2023 19:18:16 +0100 Message-Id: <20230303181842.1087717-3-roberto.sassu@huaweicloud.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230303181842.1087717-1-roberto.sassu@huaweicloud.com> References: <20230303181842.1087717-1-roberto.sassu@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: GxC2BwBnMVgKOgJk5iFpAQ--.12605S4 X-Coremail-Antispam: 1UD129KBjvJXoWxGFy3AryDtw1DWrW8trykuFg_yoW5Kr4kpF s5t3Z8Gr95Zry7uF18Aay5A34Fgas2qF4UWFWSgwnIyrnxtrn0qFsa9r1Y9ryrKFWqkryI qF15trW5uw4jyFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPIb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUXw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV WxJr0_GcWl84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6F4UJVW0owAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ew Av7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY 6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4kS14 v26r4a6rW5MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8C rVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXw CIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26ryj6F1UMIIF0xvE2Ix0cI8IcVCY1x02 67AKxVWxJr0_GcWlIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r 4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Cr1j6rxdYxBIdaVFxhVjvjDU0xZFpf9x07j7 hLnUUUUU= X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAgAFBF1jj4YvdAABsu X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org From: Roberto Sassu Change ima_post_path_mknod() definition, so that it can be registered as implementation of the path_post_mknod hook. Also, make sure that ima_post_path_mknod() is executed only if (mode & S_IFMT) is equal to zero or S_IFREG. Add this check to take into account the different placement of the path_post_mknod hook (to be introduced) in do_mknodat(). Since the new hook will be placed after the switch(), the check ensures that ima_post_path_mknod() is invoked as originally intended when it is registered as implementation of path_post_mknod. Signed-off-by: Roberto Sassu Reviewed-by: Stefan Berger --- fs/namei.c | 3 ++- include/linux/ima.h | 7 +++++-- security/integrity/ima/ima_main.c | 10 +++++++++- 3 files changed, 16 insertions(+), 4 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index edfedfbccae..b5a1ec29193 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3966,7 +3966,8 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode, error = vfs_create(idmap, path.dentry->d_inode, dentry, mode, true); if (!error) - ima_post_path_mknod(idmap, dentry); + ima_post_path_mknod(idmap, &path, dentry, mode, + dev); break; case S_IFCHR: case S_IFBLK: error = vfs_mknod(idmap, path.dentry->d_inode, diff --git a/include/linux/ima.h b/include/linux/ima.h index 910a2f11a90..179ce52013b 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -32,7 +32,8 @@ extern int ima_read_file(struct file *file, enum kernel_read_file_id id, extern int ima_post_read_file(struct file *file, void *buf, loff_t size, enum kernel_read_file_id id); extern void ima_post_path_mknod(struct mnt_idmap *idmap, - struct dentry *dentry); + const struct path *dir, struct dentry *dentry, + umode_t mode, unsigned int dev); extern int ima_file_hash(struct file *file, char *buf, size_t buf_size); extern int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size); extern void ima_kexec_cmdline(int kernel_fd, const void *buf, int size); @@ -114,7 +115,9 @@ static inline int ima_post_read_file(struct file *file, void *buf, loff_t size, } static inline void ima_post_path_mknod(struct mnt_idmap *idmap, - struct dentry *dentry) + const struct path *dir, + struct dentry *dentry, + umode_t mode, unsigned int dev) { return; } diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index d66a0a36415..8941305376b 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -692,18 +692,26 @@ void ima_post_create_tmpfile(struct mnt_idmap *idmap, /** * ima_post_path_mknod - mark as a new inode * @idmap: idmap of the mount the inode was found from + * @dir: path structure of parent of the new file * @dentry: newly created dentry + * @mode: mode of the new file + * @dev: undecoded device number * * Mark files created via the mknodat syscall as new, so that the * file data can be written later. */ void ima_post_path_mknod(struct mnt_idmap *idmap, - struct dentry *dentry) + const struct path *dir, struct dentry *dentry, + umode_t mode, unsigned int dev) { struct integrity_iint_cache *iint; struct inode *inode = dentry->d_inode; int must_appraise; + /* See do_mknodat(), IMA is executed for case 0: and case S_IFREG: */ + if ((mode & S_IFMT) != 0 && (mode & S_IFMT) != S_IFREG) + return; + if (!ima_policy_flag || !S_ISREG(inode->i_mode)) return;