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Fri, 10 Dec 2021 19:47:39 +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 v6 16/17] ima: Move dentry into ima_namespace and others onto stack Date: Fri, 10 Dec 2021 14:47:35 -0500 Message-Id: <20211210194736.1538863-17-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211210194736.1538863-1-stefanb@linux.ibm.com> References: <20211210194736.1538863-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: pualFYN857t0R6rlgU8boLoVTR670g6C X-Proofpoint-GUID: 2SRy88NSXkwGdBZCikDEj2S3f9mbeIzs 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=2021-12-10_07,2021-12-10_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1015 mlxscore=0 malwarescore=0 spamscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 phishscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112100106 Precedence: bulk List-ID: Move the policy file dentry into the ima_namespace for reuse by virtualized SecurityFS and for being able to remove it from the filesystem. Move the other dentries onto the stack. Signed-off-by: Stefan Berger --- include/linux/ima.h | 2 ++ security/integrity/ima/ima_fs.c | 33 +++++++++++++++++++-------------- 2 files changed, 21 insertions(+), 14 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index ca300306a715..cc950ccbf157 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -273,6 +273,8 @@ struct ima_namespace { struct mutex ima_write_mutex; unsigned long ima_fs_flags; int valid_policy; + + struct dentry *policy_dentry; }; extern struct ima_namespace init_ima_ns; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 090ee85bfa3a..84b3bf2f1454 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -405,14 +405,6 @@ 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, }; @@ -485,8 +477,8 @@ 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->policy_dentry); + ns->policy_dentry = NULL; #elif defined(CONFIG_IMA_WRITE_POLICY) clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags); #elif defined(CONFIG_IMA_READ_POLICY) @@ -503,8 +495,16 @@ static const struct file_operations ima_measure_policy_ops = { .llseek = generic_file_llseek, }; -int __init ima_fs_init(void) +static int __init ima_fs_ns_init(struct user_namespace *user_ns) { + struct ima_namespace *ns = user_ns->ima_ns; + struct dentry *ima_dir; + struct dentry *ima_symlink = NULL; + struct dentry *binary_runtime_measurements = NULL; + struct dentry *ascii_runtime_measurements = NULL; + struct dentry *runtime_measurements_count = NULL; + struct dentry *violations = NULL; + ima_dir = securityfs_create_dir("ima", integrity_dir); if (IS_ERR(ima_dir)) return -1; @@ -541,20 +541,25 @@ int __init ima_fs_init(void) if (IS_ERR(violations)) goto out; - ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS, + ns->policy_dentry = securityfs_create_file("policy", POLICY_FILE_FLAGS, ima_dir, NULL, &ima_measure_policy_ops); - if (IS_ERR(ima_policy)) + if (IS_ERR(ns->policy_dentry)) goto out; return 0; out: + securityfs_remove(ns->policy_dentry); 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); return -1; } + +int __init ima_fs_init(void) +{ + return ima_fs_ns_init(&init_user_ns); +}