From: Stefan Berger <stefanb@linux.vnet.ibm.com>
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 <stefanb@linux.ibm.com>
Subject: [PATCH v7 08/14] ima: Implement hierarchical processing of file accesses
Date: Thu, 16 Dec 2021 00:43:17 -0500 [thread overview]
Message-ID: <20211216054323.1707384-9-stefanb@linux.vnet.ibm.com> (raw)
In-Reply-To: <20211216054323.1707384-1-stefanb@linux.vnet.ibm.com>
From: Stefan Berger <stefanb@linux.ibm.com>
Implement hierarchical processing of file accesses in IMA namespaces by
walking the list of IMA namespaces towards the init_ima_ns. This way
file accesses can be audited in an IMA namespace and also be evaluated
against the IMA policies of parent IMA namespaces.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
include/linux/ima.h | 9 +++++++++
security/integrity/ima/ima_main.c | 30 ++++++++++++++++++++++++++----
2 files changed, 35 insertions(+), 4 deletions(-)
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 61461ee5b208..f9e592bb9560 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -66,6 +66,15 @@ static inline const char * const *arch_get_ima_policy(void)
}
#endif
+static inline struct user_namespace *ima_user_ns(struct ima_namespace *ns)
+{
+ struct user_namespace *user_ns;
+
+ user_ns = current_user_ns();
+ WARN_ON(user_ns->ima_ns != ns);
+ return user_ns;
+}
+
#else
static inline enum hash_algo ima_get_current_hash_algo(void)
{
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 98be891c2621..4c85a8df3c86 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -200,10 +200,10 @@ void ima_file_free(struct file *file)
ima_check_last_writer(iint, inode, file);
}
-static int process_measurement(struct ima_namespace *ns,
- struct file *file, const struct cred *cred,
- u32 secid, char *buf, loff_t size, int mask,
- enum ima_hooks func)
+static int __process_measurement(struct ima_namespace *ns,
+ struct file *file, const struct cred *cred,
+ u32 secid, char *buf, loff_t size, int mask,
+ enum ima_hooks func)
{
struct inode *inode = file_inode(file);
struct integrity_iint_cache *iint = NULL;
@@ -405,6 +405,28 @@ static int process_measurement(struct ima_namespace *ns,
return 0;
}
+static int process_measurement(struct ima_namespace *ns,
+ struct file *file, const struct cred *cred,
+ u32 secid, char *buf, loff_t size, int mask,
+ enum ima_hooks func)
+{
+ struct user_namespace *user_ns = ima_user_ns(ns);
+ int ret = 0;
+
+ while (user_ns) {
+ ns = user_ns->ima_ns;
+
+ ret = __process_measurement(ns, file, cred, secid, buf, size,
+ mask, func);
+ if (ret)
+ break;
+
+ user_ns = user_ns->parent;
+ };
+
+ return ret;
+}
+
/**
* ima_file_mmap - based on policy, collect/store measurement.
* @file: pointer to the file to be measured (May be NULL)
--
2.31.1
next prev parent reply other threads:[~2021-12-16 5:43 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-16 5:43 [PATCH v7 00/14] ima: Namespace IMA with audit support in IMA-ns Stefan Berger
2021-12-16 5:43 ` [PATCH v7 01/14] ima: Add IMA namespace support Stefan Berger
2021-12-16 14:08 ` Christian Brauner
2021-12-16 21:52 ` James Bottomley
2021-12-17 9:55 ` Christian Brauner
2021-12-16 5:43 ` [PATCH v7 02/14] ima: Define ns_status for storing namespaced iint data Stefan Berger
2021-12-16 5:43 ` [PATCH v7 03/14] ima: Namespace audit status flags Stefan Berger
2021-12-16 5:43 ` [PATCH v7 04/14] ima: Move policy related variables into ima_namespace Stefan Berger
2021-12-16 14:26 ` kernel test robot
2021-12-16 5:43 ` [PATCH v7 05/14] ima: Move ima_htable " Stefan Berger
2021-12-16 5:43 ` [PATCH v7 06/14] ima: Move measurement list related variables " Stefan Berger
2021-12-16 5:43 ` [PATCH v7 07/14] ima: Only accept AUDIT rules for IMA non-init_ima_ns namespaces for now Stefan Berger
2021-12-16 5:43 ` Stefan Berger [this message]
2021-12-16 5:43 ` [PATCH v7 09/14] securityfs: Only use simple_pin_fs/simple_release_fs for init_user_ns Stefan Berger
2021-12-16 5:43 ` [PATCH v7 10/14] securityfs: Extend securityfs with namespacing support Stefan Berger
2021-12-16 13:40 ` Christian Brauner
2021-12-16 16:28 ` Christian Brauner
2022-01-03 14:09 ` Stefan Berger
2021-12-17 16:21 ` [RFC PATCH] securityfs: securityfs_dir_inode_operations can be static kernel test robot
2021-12-17 16:29 ` [PATCH v7 10/14] securityfs: Extend securityfs with namespacing support kernel test robot
2021-12-16 5:43 ` [PATCH v7 11/14] ima: Move some IMA policy and filesystem related variables into ima_namespace Stefan Berger
2021-12-16 5:43 ` [PATCH v7 12/14] ima: Use mac_admin_ns_capable() to check corresponding capability Stefan Berger
2021-12-16 5:43 ` [PATCH v7 13/14] ima: Move dentry into ima_namespace and others onto stack Stefan Berger
2021-12-16 5:43 ` [PATCH v7 14/14] ima: Setup securityfs for IMA namespace Stefan Berger
2021-12-16 10:59 ` kernel test robot
2021-12-16 12:02 ` kernel test robot
2021-12-16 13:51 ` Christian Brauner
2021-12-16 21:38 ` Stefan Berger
2021-12-16 12:50 ` [PATCH v7 00/14] ima: Namespace IMA with audit support in IMA-ns Christian Brauner
2021-12-16 13:31 ` Christian Brauner
2021-12-16 21:27 ` Stefan Berger
2021-12-17 10:25 ` Christian Brauner
2021-12-18 2:38 ` Stefan Berger
2021-12-16 21:00 ` Stefan Berger
2021-12-17 10:06 ` Christian Brauner
2021-12-27 17:29 ` Stefan Berger
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