[PATCH v6 00/17] ima: Namespace IMA with audit support in IMA-ns

[PATCH v6 00/17] ima: Namespace IMA with audit support in IMA-ns

[Stefan Berger]

The goal of this series of patches is to start with the namespacing of
IMA and support auditing within an IMA namespace (IMA-ns) as the first
step.

In this series the IMA namespace is piggy backing on the user namespace
and therefore an IMA namespace gets created when a user namespace is
created. The advantage of this is that the user namespace can provide
the keys infrastructure that IMA appraisal support will need later on.

We chose the goal of supporting auditing within an IMA namespace since it
requires the least changes to IMA. Following this series, auditing within
an IMA namespace can be activated by a user running the following lines
that rely on a statically linked busybox to be installed on the host for
execution within the minimal container environment:

mkdir -p rootfs/{bin,mnt,proc}
cp /sbin/busybox rootfs/bin
cp /sbin/busybox rootfs/bin/busybox2
echo >> rootfs/bin/busybox2
PATH=/bin unshare --user --map-root-user --mount-proc --pid --fork \
  --root rootfs busybox sh -c \
 "busybox mount -t securityfs /mnt /mnt; \
  busybox echo 'audit func=BPRM_CHECK mask=MAY_EXEC' > /mnt/ima/policy; \
  busybox2 cat /mnt/ima/policy"

[busybox2 is used to demonstrate 2 measurements; see below]

Following the audit log on the host the last line cat'ing the IMA policy
inside the namespace would have been audited. Unfortunately the auditing
line is not distinguishable from one stemming from actions on the host.
The hope here is that Richard Brigg's container id support for auditing
would help resolve the problem.

The following lines added to a suitable IMA policy on the host would
cause the execution of the commands inside the container (by uid 1000)
to be measured and audited as well on the host, thus leading to two
auditing messages for the 'busybox2 cat' above and log entries in IMA's
system log.

echo -e "measure func=BPRM_CHECK mask=MAY_EXEC uid=1000\n" \
        "audit func=BPRM_CHECK mask=MAY_EXEC uid=1000\n" \
    > /sys/kernel/security/ima/policy

The goal of supporting measurement and auditing by the host, of actions
occurring within IMA namespaces, is that users, particularly root,
should not be able to evade the host's IMA policy just by spawning
new IMA namespaces, running programs there, and discarding the namespaces
again. This is achieved through 'hierarchical processing' of file
accesses that are evaluated against the policy of the namespace where
the action occurred and against all namespaces' and their policies leading
back to the root IMA namespace (init_ima_ns).

The patch series adds support for a virtualized SecurityFS with a few
new API calls that are used by IMA namespacing. Only the data relevant
to the IMA namespace are shown. The files and directories of other
security subsystems (TPM, evm, Tomoyo, safesetid) are not showing
up when secruityfs is mounted inside a user namespace.

Much of the code leading up to the virtualization of SecurityFS deals
with moving IMA's variables from various files into the IMA namespace
structure called 'ima_namespace'. When it comes to determining the
current IMA namespace I took the approach to get the current IMA
namespace (get_current_ns()) on the top level and pass the pointer all
the way down to those functions that now need access to the ima_namespace
to get to their variables. This later on comes in handy once hierarchical
processing is implemented in this series where we walk the list of
namespaces backwards and again need to pass the pointer into functions.

This patch also introduces usage of CAP_MAC_ADMIN to allow access to the
IMA policy via reduced capabilities. We would again later on use this
capability to allow users to set file extended attributes for IMA appraisal
support.

My tree with these patches is here:

git clone https://github.com/stefanberger/linux-ima-namespaces v5.15+imans.v6.posted 

Regards,
   Stefan

v6:
 - Removed kref and pointer to user_ns in ima_namespace (patch 1)
 - Moved only the policy file dentry into ima_namespace; other dentries are on
   stack now and can be discarded
 - Merged James's patch simplifying securityfs_remove and dropping dget()
 - Added patch with Christian's suggestion to tie opened SecurityFS file to
   the user/IMA namespace it belongs to
 - Passing missing ima_namespace parameter in functions in ima_kexec.c (ppc64)
 - Reverted v5's change to patch 4 related to protection of ima_namespace

v5:
 - Followed Christian's suggestions on patch 1. Also, reverted increased reference
   counter on init_user_ns since ima_ns doesn't take reference to its user_ns.
 - No addtional reference is taken on securityfs dentries for user_ns != init_user_ns.
   Updated documentation and removed cleanup of dentries on superblock kill.
   (patches 12 & 16)
 - Moved else branch to earlier patch (patch 11)
 - Protect ima_namespace by taking reference on user namespace for delayed work queue.
   (patch 4)

v4:
 - For consistency moved 'ns = get_current_ns()' to top of functions
 - Merge in James's latest SecurityFS patch

v3:
 - Further modifications to virtualized SecurityFS following James's posted patch
 - Dropping of early teardown for user_namespaces since not needed anymore

v2:
 - Folllwed Christian's suggestion to virtualize securitytfs; no more securityfs_ns
 - Followed James's advice for late 'population' of securityfs for IMA namespaces
 - Squashed 2 patches dealing with capabilities
 - Added missing 'depends on USER_NS' to Kconfig
 - Added missing 'static' to several functions



Mehmet Kayaalp (2):
  ima: Define ns_status for storing namespaced iint data
  ima: Namespace audit status flags

Stefan Berger (15):
  ima: Add IMA namespace support
  ima: Move delayed work queue and variables into ima_namespace
  ima: Move IMA's keys queue related variables into ima_namespace
  ima: Move policy related variables into ima_namespace
  ima: Move ima_htable into ima_namespace
  ima: Move measurement list related variables into ima_namespace
  ima: Only accept AUDIT rules for IMA non-init_ima_ns namespaces for
    now
  ima: Implement hierarchical processing of file accesses
  securityfs: Only use simple_pin_fs/simple_release_fs for init_user_ns
  securityfs: Extend securityfs with namespacing support
  ima: Move some IMA policy and filesystem related variables into
    ima_namespace
  ima: Tie opened SecurityFS files to the IMA namespace it belongs to
  ima: Use mac_admin_ns_capable() to check corresponding capability
  ima: Move dentry into ima_namespace and others onto stack
  ima: Setup securityfs for IMA namespace

 include/linux/capability.h                   |   6 +
 include/linux/ima.h                          | 109 ++++++++++++
 include/linux/user_namespace.h               |   4 +
 init/Kconfig                                 |  13 ++
 kernel/user.c                                |   7 +
 kernel/user_namespace.c                      |   8 +
 security/inode.c                             |  55 +++---
 security/integrity/ima/Makefile              |   4 +-
 security/integrity/ima/ima.h                 | 145 ++++++++++-----
 security/integrity/ima/ima_api.c             |  33 ++--
 security/integrity/ima/ima_appraise.c        |  26 +--
 security/integrity/ima/ima_asymmetric_keys.c |   8 +-
 security/integrity/ima/ima_fs.c              | 178 +++++++++++++------
 security/integrity/ima/ima_init.c            |  20 ++-
 security/integrity/ima/ima_init_ima_ns.c     |  71 ++++++++
 security/integrity/ima/ima_kexec.c           |  15 +-
 security/integrity/ima/ima_main.c            | 144 ++++++++++-----
 security/integrity/ima/ima_ns.c              |  98 ++++++++++
 security/integrity/ima/ima_ns_status.c       | 132 ++++++++++++++
 security/integrity/ima/ima_policy.c          | 146 ++++++++-------
 security/integrity/ima/ima_queue.c           |  75 ++++----
 security/integrity/ima/ima_queue_keys.c      |  73 +++-----
 security/integrity/ima/ima_template.c        |   4 +-
 23 files changed, 1027 insertions(+), 347 deletions(-)
 create mode 100644 security/integrity/ima/ima_init_ima_ns.c
 create mode 100644 security/integrity/ima/ima_ns.c
 create mode 100644 security/integrity/ima/ima_ns_status.c

-- 
2.31.1

[PATCH v6 01/17] ima: Add IMA namespace support

[Stefan Berger]

Implement an IMA namespace data structure that gets created alongside a
user namespace with CLONE_NEWUSER. This lays down the foundation for
namespacing the different aspects of IMA (eg. IMA-audit, IMA-measurement,
IMA-appraisal).

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
 include/linux/ima.h                      | 37 +++++++++++++
 include/linux/user_namespace.h           |  4 ++
 init/Kconfig                             | 10 ++++
 kernel/user.c                            |  7 +++
 kernel/user_namespace.c                  |  8 +++
 security/integrity/ima/Makefile          |  3 +-
 security/integrity/ima/ima.h             |  4 ++
 security/integrity/ima/ima_init.c        |  4 ++
 security/integrity/ima/ima_init_ima_ns.c | 32 +++++++++++
 security/integrity/ima/ima_ns.c          | 69 ++++++++++++++++++++++++
 10 files changed, 177 insertions(+), 1 deletion(-)
 create mode 100644 security/integrity/ima/ima_init_ima_ns.c
 create mode 100644 security/integrity/ima/ima_ns.c

diff --git a/include/linux/ima.h b/include/linux/ima.h
index b6ab66a546ae..f282e40c316c 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -11,6 +11,7 @@
 #include <linux/fs.h>
 #include <linux/security.h>
 #include <linux/kexec.h>
+#include <linux/user_namespace.h>
 #include <crypto/hash_info.h>
 struct linux_binprm;
 
@@ -210,6 +211,42 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
 }
 #endif /* CONFIG_IMA_APPRAISE */
 
+struct ima_namespace {
+	int avoid_zero_size;
+};
+
+extern struct ima_namespace init_ima_ns;
+
+#ifdef CONFIG_IMA_NS
+
+void free_ima_ns(struct user_namespace *ns);
+int create_ima_ns(struct user_namespace *user_ns);
+
+static inline struct ima_namespace *get_current_ns(void)
+{
+	return current_user_ns()->ima_ns;
+}
+
+#else
+
+static inline void free_ima_ns(struct user_namespace *user_ns)
+{
+}
+
+static inline int create_ima_ns(struct user_namespace *user_ns)
+{
+#ifdef CONFIG_IMA
+	user_ns->ima_ns = &init_ima_ns;
+#endif
+	return 0;
+}
+
+static inline struct ima_namespace *get_current_ns(void)
+{
+	return &init_ima_ns;
+}
+#endif /* CONFIG_IMA_NS */
+
 #if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING)
 extern bool ima_appraise_signature(enum kernel_read_file_id func);
 #else
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 33a4240e6a6f..5249db04d62b 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -36,6 +36,7 @@ struct uid_gid_map { /* 64 bytes -- 1 cache line */
 #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
 
 struct ucounts;
+struct ima_namespace;
 
 enum ucount_type {
 	UCOUNT_USER_NAMESPACES,
@@ -99,6 +100,9 @@ struct user_namespace {
 #endif
 	struct ucounts		*ucounts;
 	long ucount_max[UCOUNT_COUNTS];
+#ifdef CONFIG_IMA
+	struct ima_namespace	*ima_ns;
+#endif
 } __randomize_layout;
 
 struct ucounts {
diff --git a/init/Kconfig b/init/Kconfig
index 11f8a845f259..27890607e8cb 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1242,6 +1242,16 @@ config NET_NS
 	  Allow user space to create what appear to be multiple instances
 	  of the network stack.
 
+config IMA_NS
+	bool "IMA namespace"
+	depends on USER_NS
+	depends on IMA
+	default y
+	help
+	  Allow the creation of IMA namespaces for each user namespace.
+	  Namespaced IMA enables having IMA features work separately
+	  in each IMA namespace.
+
 endif # NAMESPACES
 
 config CHECKPOINT_RESTORE
diff --git a/kernel/user.c b/kernel/user.c
index e2cf8c22b539..287751d89b44 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -20,6 +20,10 @@
 #include <linux/user_namespace.h>
 #include <linux/proc_ns.h>
 
+#ifdef CONFIG_IMA
+extern struct ima_namespace init_ima_ns;
+#endif
+
 /*
  * userns count is 1 for root user, 1 for init_uts_ns,
  * and 1 for... ?
@@ -67,6 +71,9 @@ struct user_namespace init_user_ns = {
 	.keyring_name_list = LIST_HEAD_INIT(init_user_ns.keyring_name_list),
 	.keyring_sem = __RWSEM_INITIALIZER(init_user_ns.keyring_sem),
 #endif
+#ifdef CONFIG_IMA
+	.ima_ns = &init_ima_ns,
+#endif
 };
 EXPORT_SYMBOL_GPL(init_user_ns);
 
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 6b2e3ca7ee99..6fa01323aac9 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -20,6 +20,7 @@
 #include <linux/fs_struct.h>
 #include <linux/bsearch.h>
 #include <linux/sort.h>
+#include <linux/ima.h>
 
 static struct kmem_cache *user_ns_cachep __read_mostly;
 static DEFINE_MUTEX(userns_state_mutex);
@@ -141,8 +142,14 @@ int create_user_ns(struct cred *new)
 	if (!setup_userns_sysctls(ns))
 		goto fail_keyring;
 
+	ret = create_ima_ns(ns);
+	if (ret)
+		goto fail_sysctls;
+
 	set_cred_user_ns(new, ns);
 	return 0;
+fail_sysctls:
+	retire_userns_sysctls(ns);
 fail_keyring:
 #ifdef CONFIG_PERSISTENT_KEYRINGS
 	key_put(ns->persistent_keyring_register);
@@ -196,6 +203,7 @@ static void free_user_ns(struct work_struct *work)
 			kfree(ns->projid_map.forward);
 			kfree(ns->projid_map.reverse);
 		}
+		free_ima_ns(ns);
 		retire_userns_sysctls(ns);
 		key_free_user_ns(ns);
 		ns_free_inum(&ns->ns);
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index 2499f2485c04..b86a35fbed60 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile
@@ -7,13 +7,14 @@
 obj-$(CONFIG_IMA) += ima.o
 
 ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
-	 ima_policy.o ima_template.o ima_template_lib.o
+	 ima_policy.o ima_template.o ima_template_lib.o ima_init_ima_ns.o
 ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
 ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
 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 be965a8715e4..2f8adf383054 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -418,6 +418,10 @@ static inline void ima_free_modsig(struct modsig *modsig)
 }
 #endif /* CONFIG_IMA_APPRAISE_MODSIG */
 
+int ima_ns_init(void);
+struct ima_namespace;
+int ima_init_namespace(struct ima_namespace *ns);
+
 /* LSM based policy rules require audit */
 #ifdef CONFIG_IMA_LSM_RULES
 
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index b26fa67476b4..f6ae4557a0da 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -120,6 +120,10 @@ int __init ima_init(void)
 {
 	int rc;
 
+	rc = ima_ns_init();
+	if (rc)
+		return rc;
+
 	ima_tpm_chip = tpm_default_chip();
 	if (!ima_tpm_chip)
 		pr_info("No TPM chip found, activating TPM-bypass!\n");
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
new file mode 100644
index 000000000000..f820686baf9f
--- /dev/null
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016-2021 IBM Corporation
+ * Author:
+ *   Yuqiong Sun <suny@us.ibm.com>
+ *   Stefan Berger <stefanb@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#include <linux/export.h>
+#include <linux/user_namespace.h>
+#include <linux/ima.h>
+#include <linux/proc_ns.h>
+
+#include "ima.h"
+
+int ima_init_namespace(struct ima_namespace *ns)
+{
+	return 0;
+}
+
+int __init ima_ns_init(void)
+{
+	return ima_init_namespace(&init_ima_ns);
+}
+
+struct ima_namespace init_ima_ns = {
+};
+EXPORT_SYMBOL(init_ima_ns);
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
new file mode 100644
index 000000000000..c575ddf0c3f3
--- /dev/null
+++ b/security/integrity/ima/ima_ns.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016-2021 IBM Corporation
+ * Author:
+ *  Yuqiong Sun <suny@us.ibm.com>
+ *  Stefan Berger <stefanb@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#include <linux/kref.h>
+#include <linux/slab.h>
+#include <linux/ima.h>
+#include <linux/mount.h>
+#include <linux/proc_ns.h>
+#include <linux/lsm_hooks.h>
+
+#include "ima.h"
+
+static struct kmem_cache *imans_cachep;
+
+int create_ima_ns(struct user_namespace *user_ns)
+{
+	struct ima_namespace *ns;
+	int err;
+
+	ns = kmem_cache_zalloc(imans_cachep, GFP_KERNEL);
+	if (!ns)
+		return -ENOMEM;
+	pr_debug("NEW     ima_ns: 0x%p\n", ns);
+
+	err = ima_init_namespace(ns);
+	if (err)
+		goto fail_free;
+
+	user_ns->ima_ns = ns;
+
+	return 0;
+
+fail_free:
+	kmem_cache_free(imans_cachep, ns);
+
+	return err;
+}
+
+static void destroy_ima_ns(struct ima_namespace *ns)
+{
+	pr_debug("DESTROY ima_ns: 0x%p\n", ns);
+	kmem_cache_free(imans_cachep, ns);
+}
+
+void free_ima_ns(struct user_namespace *user_ns)
+{
+	struct ima_namespace *ns = user_ns->ima_ns;
+
+	if (WARN_ON(ns == &init_ima_ns))
+		return;
+
+	destroy_ima_ns(ns);
+}
+
+static int __init imans_cache_init(void)
+{
+	imans_cachep = KMEM_CACHE(ima_namespace, SLAB_PANIC);
+	return 0;
+}
+subsys_initcall(imans_cache_init)
-- 
2.31.1

[PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data

[Stefan Berger]

From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>

This patch adds an rbtree to the IMA namespace structure that stores a
namespaced version of iint->flags in ns_status struct. Similar to the
integrity_iint_cache, both the iint ns_struct are looked up using the
inode pointer value. The lookup, allocate, and insertion code is also
similar, except ns_struct is not free'd when the inode is free'd.
Instead, the lookup verifies the i_ino and i_generation fields are also a
match.

Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Changelog:
v2:
 * fixed tree traversal in __ima_ns_status_find()
---
 include/linux/ima.h                      |   4 +-
 security/integrity/ima/Makefile          |   1 +
 security/integrity/ima/ima.h             |  24 +++++
 security/integrity/ima/ima_init_ima_ns.c |   7 ++
 security/integrity/ima/ima_ns.c          |   1 +
 security/integrity/ima/ima_ns_status.c   | 132 +++++++++++++++++++++++
 6 files changed, 168 insertions(+), 1 deletion(-)
 create mode 100644 security/integrity/ima/ima_ns_status.c

diff --git a/include/linux/ima.h b/include/linux/ima.h
index f282e40c316c..19e6936250ea 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -212,7 +212,9 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
 #endif /* CONFIG_IMA_APPRAISE */
 
 struct ima_namespace {
-	int avoid_zero_size;
+	struct rb_root ns_status_tree;
+	rwlock_t ns_status_lock;
+	struct kmem_cache *ns_status_cache;
 };
 
 extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index b86a35fbed60..78c84214e109 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile
@@ -10,6 +10,7 @@ ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
 	 ima_policy.o ima_template.o ima_template_lib.o ima_init_ima_ns.o
 ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
 ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
+ima-$(CONFIG_IMA_NS) += ima_ns.o ima_ns_status.o
 ima-$(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
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 2f8adf383054..28896d256e36 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -133,6 +133,14 @@ static inline void ima_load_kexec_buffer(void) {}
  */
 extern bool ima_canonical_fmt;
 
+struct ns_status {
+	struct rb_node rb_node;
+	struct inode *inode;
+	ino_t i_ino;
+	u32 i_generation;
+	unsigned long flags;
+};
+
 /* Internal IMA function definitions */
 int ima_init(void);
 int ima_fs_init(void);
@@ -422,6 +430,22 @@ int ima_ns_init(void);
 struct ima_namespace;
 int ima_init_namespace(struct ima_namespace *ns);
 
+#ifdef CONFIG_IMA_NS
+struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
+				    struct inode *inode);
+
+void free_ns_status_cache(struct ima_namespace *ns);
+
+#else
+
+static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
+						  struct inode *inode)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_IMA_NS */
+
 /* LSM based policy rules require audit */
 #ifdef CONFIG_IMA_LSM_RULES
 
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index f820686baf9f..08781a44f7bf 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -14,11 +14,18 @@
 #include <linux/user_namespace.h>
 #include <linux/ima.h>
 #include <linux/proc_ns.h>
+#include <linux/slab.h>
 
 #include "ima.h"
 
 int ima_init_namespace(struct ima_namespace *ns)
 {
+	ns->ns_status_tree = RB_ROOT;
+	rwlock_init(&ns->ns_status_lock);
+	ns->ns_status_cache = KMEM_CACHE(ns_status, SLAB_PANIC);
+	if (!ns->ns_status_cache)
+		return -ENOMEM;
+
 	return 0;
 }
 
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index c575ddf0c3f3..20472959ec26 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -48,6 +48,7 @@ int create_ima_ns(struct user_namespace *user_ns)
 static void destroy_ima_ns(struct ima_namespace *ns)
 {
 	pr_debug("DESTROY ima_ns: 0x%p\n", ns);
+	free_ns_status_cache(ns);
 	kmem_cache_free(imans_cachep, ns);
 }
 
diff --git a/security/integrity/ima/ima_ns_status.c b/security/integrity/ima/ima_ns_status.c
new file mode 100644
index 000000000000..807dfaecdb5e
--- /dev/null
+++ b/security/integrity/ima/ima_ns_status.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016-2021 IBM Corporation
+ * Author:
+ *  Yuqiong Sun <suny@us.ibm.com>
+ *  Stefan Berger <stefanb@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#include <linux/user_namespace.h>
+#include <linux/proc_ns.h>
+#include <linux/ima.h>
+
+#include "ima.h"
+
+void free_ns_status_cache(struct ima_namespace *ns)
+{
+	struct ns_status *status, *next;
+
+	write_lock(&ns->ns_status_lock);
+	rbtree_postorder_for_each_entry_safe(status, next,
+					     &ns->ns_status_tree, rb_node)
+		kmem_cache_free(ns->ns_status_cache, status);
+	ns->ns_status_tree = RB_ROOT;
+	write_unlock(&ns->ns_status_lock);
+	kmem_cache_destroy(ns->ns_status_cache);
+}
+
+/*
+ * __ima_ns_status_find - return the ns_status associated with an inode
+ */
+static struct ns_status *__ima_ns_status_find(struct ima_namespace *ns,
+					      struct inode *inode)
+{
+	struct ns_status *status;
+	struct rb_node *n = ns->ns_status_tree.rb_node;
+
+	while (n) {
+		status = rb_entry(n, struct ns_status, rb_node);
+
+		if (inode < status->inode)
+			n = n->rb_left;
+		else if (inode > status->inode)
+			n = n->rb_right;
+		else
+			break;
+	}
+	if (!n)
+		return NULL;
+
+	return status;
+}
+
+/*
+ * ima_ns_status_find - return the ns_status associated with an inode
+ */
+static struct ns_status *ima_ns_status_find(struct ima_namespace *ns,
+					    struct inode *inode)
+{
+	struct ns_status *status;
+
+	read_lock(&ns->ns_status_lock);
+	status = __ima_ns_status_find(ns, inode);
+	read_unlock(&ns->ns_status_lock);
+
+	return status;
+}
+
+static void insert_ns_status(struct ima_namespace *ns, struct inode *inode,
+			     struct ns_status *status)
+{
+	struct rb_node **p;
+	struct rb_node *node, *parent = NULL;
+	struct ns_status *test_status;
+
+	p = &ns->ns_status_tree.rb_node;
+	while (*p) {
+		parent = *p;
+		test_status = rb_entry(parent, struct ns_status, rb_node);
+		if (inode < test_status->inode)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+	node = &status->rb_node;
+	rb_link_node(node, parent, p);
+	rb_insert_color(node, &ns->ns_status_tree);
+}
+
+struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
+				    struct inode *inode)
+{
+	struct ns_status *status;
+	int skip_insert = 0;
+
+	status = ima_ns_status_find(ns, inode);
+	if (status) {
+		/*
+		 * Unlike integrity_iint_cache we are not free'ing the
+		 * ns_status data when the inode is free'd. So, in addition to
+		 * checking the inode pointer, we need to make sure the
+		 * (i_generation, i_ino) pair matches as well.
+		 */
+		if (inode->i_ino == status->i_ino &&
+		    inode->i_generation == status->i_generation)
+			return status;
+
+		/* Same inode number is reused, overwrite the ns_status */
+		skip_insert = 1;
+	} else {
+		status = kmem_cache_alloc(ns->ns_status_cache, GFP_NOFS);
+		if (!status)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	write_lock(&ns->ns_status_lock);
+
+	if (!skip_insert)
+		insert_ns_status(ns, inode, status);
+
+	status->inode = inode;
+	status->i_ino = inode->i_ino;
+	status->i_generation = inode->i_generation;
+	status->flags = 0UL;
+
+	write_unlock(&ns->ns_status_lock);
+
+	return status;
+}
-- 
2.31.1

[PATCH v6 03/17] ima: Namespace audit status flags

[Stefan Berger]

From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>

The iint cache stores whether the file is measured, appraised, audited
etc. This patch moves the IMA_AUDITED flag into the per-namespace
ns_status, enabling IMA audit mechanism to audit the same file each time
it is accessed in a new namespace.

The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if
any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not
enabled.

Read and write operations on the iint flags is replaced with function
calls. For reading, iint_flags() returns the bitwise AND of iint->flags
and ns_status->flags. The ns_status flags are masked with
IMA_NS_STATUS_FLAGS (currently only IMA_AUDITED). Similarly
set_iint_flags() only writes the masked portion to the ns_status flags,
while the iint flags is set as before. The ns_status parameter added to
ima_audit_measurement() is used with the above functions to query and
set the ns_status flags.

Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>

Changelog:
v2:
 * fixed flag calculation in iint_flags()
---
 init/Kconfig                      |  3 +++
 security/integrity/ima/ima.h      | 23 ++++++++++++++++++++++-
 security/integrity/ima/ima_api.c  |  8 +++++---
 security/integrity/ima/ima_main.c | 25 ++++++++++++++++++-------
 security/integrity/ima/ima_ns.c   | 20 ++++++++++++++++++++
 5 files changed, 68 insertions(+), 11 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 27890607e8cb..1e1c49f1d129 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1251,6 +1251,9 @@ config IMA_NS
 	  Allow the creation of IMA namespaces for each user namespace.
 	  Namespaced IMA enables having IMA features work separately
 	  in each IMA namespace.
+	  Currently, only the audit status flags are stored in the namespace,
+	  which allows the same file to be audited each time it is accessed
+	  in a new namespace.
 
 endif # NAMESPACES
 
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 28896d256e36..dd06e16c4e1c 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -282,7 +282,8 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
 			       int pcr, const char *func_data,
 			       bool buf_hash, u8 *digest, size_t digest_len);
 void ima_audit_measurement(struct integrity_iint_cache *iint,
-			   const unsigned char *filename);
+			   const unsigned char *filename,
+			   struct ns_status *status);
 int ima_alloc_init_template(struct ima_event_data *event_data,
 			    struct ima_template_entry **entry,
 			    struct ima_template_desc *template_desc);
@@ -426,6 +427,9 @@ static inline void ima_free_modsig(struct modsig *modsig)
 }
 #endif /* CONFIG_IMA_APPRAISE_MODSIG */
 
+#define IMA_NS_STATUS_ACTIONS   IMA_AUDIT
+#define IMA_NS_STATUS_FLAGS     IMA_AUDITED
+
 int ima_ns_init(void);
 struct ima_namespace;
 int ima_init_namespace(struct ima_namespace *ns);
@@ -436,6 +440,10 @@ struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
 
 void free_ns_status_cache(struct ima_namespace *ns);
 
+unsigned long iint_flags(struct integrity_iint_cache *iint,
+			 struct ns_status *status);
+unsigned long set_iint_flags(struct integrity_iint_cache *iint,
+			     struct ns_status *status, unsigned long flags);
 #else
 
 static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
@@ -444,6 +452,19 @@ static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
 	return NULL;
 }
 
+static inline unsigned long iint_flags(struct integrity_iint_cache *iint,
+				       struct ns_status *status)
+{
+	return iint->flags;
+}
+
+static inline unsigned long set_iint_flags(struct integrity_iint_cache *iint,
+					   struct ns_status *status,
+					   unsigned long flags)
+{
+	iint->flags = flags;
+	return flags;
+}
 #endif /* CONFIG_IMA_NS */
 
 /* LSM based policy rules require audit */
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index a64fb0130b01..8f7bab17b784 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -342,14 +342,16 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
 }
 
 void ima_audit_measurement(struct integrity_iint_cache *iint,
-			   const unsigned char *filename)
+			   const unsigned char *filename,
+			   struct ns_status *status)
 {
 	struct audit_buffer *ab;
 	char *hash;
 	const char *algo_name = hash_algo_name[iint->ima_hash->algo];
 	int i;
+	unsigned long flags = iint_flags(iint, status);
 
-	if (iint->flags & IMA_AUDITED)
+	if (flags & IMA_AUDITED)
 		return;
 
 	hash = kzalloc((iint->ima_hash->length * 2) + 1, GFP_KERNEL);
@@ -372,7 +374,7 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
 	audit_log_task_info(ab);
 	audit_log_end(ab);
 
-	iint->flags |= IMA_AUDITED;
+	set_iint_flags(iint, status, flags | IMA_AUDITED);
 out:
 	kfree(hash);
 	return;
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 465865412100..4386010a480e 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -202,8 +202,10 @@ static int process_measurement(struct file *file, const struct cred *cred,
 			       u32 secid, char *buf, loff_t size, int mask,
 			       enum ima_hooks func)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint = NULL;
+	struct ns_status *status = NULL;
 	struct ima_template_desc *template_desc = NULL;
 	char *pathbuf = NULL;
 	char filename[NAME_MAX];
@@ -216,6 +218,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	bool violation_check;
 	enum hash_algo hash_algo;
 	unsigned int allowed_algos = 0;
+	unsigned long flags;
 
 	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
 		return 0;
@@ -244,6 +247,12 @@ static int process_measurement(struct file *file, const struct cred *cred,
 		iint = integrity_inode_get(inode);
 		if (!iint)
 			rc = -ENOMEM;
+
+		if (!rc && (action & IMA_NS_STATUS_ACTIONS)) {
+			status = ima_get_ns_status(ns, inode);
+			if (IS_ERR(status))
+				rc = PTR_ERR(status);
+		}
 	}
 
 	if (!rc && violation_check)
@@ -259,11 +268,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
 
 	mutex_lock(&iint->mutex);
 
+	flags = iint_flags(iint, status);
+
 	if (test_and_clear_bit(IMA_CHANGE_ATTR, &iint->atomic_flags))
 		/* reset appraisal flags if ima_inode_post_setattr was called */
-		iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED |
-				 IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK |
-				 IMA_ACTION_FLAGS);
+		flags &= ~(IMA_APPRAISE | IMA_APPRAISED |
+			   IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK |
+			   IMA_ACTION_FLAGS);
 
 	/*
 	 * Re-evaulate the file if either the xattr has changed or the
@@ -274,7 +285,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	    ((inode->i_sb->s_iflags & SB_I_IMA_UNVERIFIABLE_SIGNATURE) &&
 	     !(inode->i_sb->s_iflags & SB_I_UNTRUSTED_MOUNTER) &&
 	     !(action & IMA_FAIL_UNVERIFIABLE_SIGS))) {
-		iint->flags &= ~IMA_DONE_MASK;
+		flags &= ~IMA_DONE_MASK;
 		iint->measured_pcrs = 0;
 	}
 
@@ -282,9 +293,9 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	 * (IMA_MEASURE, IMA_MEASURED, IMA_XXXX_APPRAISE, IMA_XXXX_APPRAISED,
 	 *  IMA_AUDIT, IMA_AUDITED)
 	 */
-	iint->flags |= action;
+	flags = set_iint_flags(iint, status, flags | action);
 	action &= IMA_DO_MASK;
-	action &= ~((iint->flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1);
+	action &= ~((flags & (IMA_DONE_MASK ^ IMA_MEASURED)) >> 1);
 
 	/* If target pcr is already measured, unset IMA_MEASURE action */
 	if ((action & IMA_MEASURE) && (iint->measured_pcrs & (0x1 << pcr)))
@@ -359,7 +370,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 						  &pathname, filename);
 	}
 	if (action & IMA_AUDIT)
-		ima_audit_measurement(iint, pathname);
+		ima_audit_measurement(iint, pathname, status);
 
 	if ((file->f_flags & O_DIRECT) && (iint->flags & IMA_PERMIT_DIRECTIO))
 		rc = 0;
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index 20472959ec26..472535cd7126 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -62,6 +62,26 @@ void free_ima_ns(struct user_namespace *user_ns)
 	destroy_ima_ns(ns);
 }
 
+unsigned long iint_flags(struct integrity_iint_cache *iint,
+			 struct ns_status *status)
+{
+	if (!status)
+		return iint->flags;
+
+	return (iint->flags & ~IMA_NS_STATUS_FLAGS) |
+	       (status->flags & IMA_NS_STATUS_FLAGS);
+}
+
+unsigned long set_iint_flags(struct integrity_iint_cache *iint,
+			     struct ns_status *status, unsigned long flags)
+{
+	iint->flags = flags;
+	if (status)
+		status->flags = flags & IMA_NS_STATUS_FLAGS;
+
+	return flags;
+}
+
 static int __init imans_cache_init(void)
 {
 	imans_cachep = KMEM_CACHE(ima_namespace, SLAB_PANIC);
-- 
2.31.1

[PATCH v6 04/17] ima: Move delayed work queue and variables into ima_namespace

[Stefan Berger]

Move the delayed work queue and associated variables to the
ima_namespace and initialize them.

Since keys queued up for measurement currently are only relevant in the
init_ima_ns, call ima_init_key_queue() only when the init_ima_ns is
initialized.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                      | 11 ++++++++
 security/integrity/ima/ima.h             | 12 +++++----
 security/integrity/ima/ima_fs.c          |  4 ++-
 security/integrity/ima/ima_init.c        |  2 --
 security/integrity/ima/ima_init_ima_ns.c |  8 ++++++
 security/integrity/ima/ima_policy.c      |  4 +--
 security/integrity/ima/ima_queue_keys.c  | 34 ++++++++++--------------
 7 files changed, 45 insertions(+), 30 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 19e6936250ea..5540ddd39eab 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -215,6 +215,17 @@ struct ima_namespace {
 	struct rb_root ns_status_tree;
 	rwlock_t ns_status_lock;
 	struct kmem_cache *ns_status_cache;
+
+#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+	/*
+	 * If custom IMA policy is not loaded then keys queued up
+	 * for measurement should be freed. This worker is used
+	 * for handling this scenario.
+	 */
+	struct delayed_work ima_keys_delayed_work;
+	long ima_key_queue_timeout;
+	bool timer_expired;
+#endif
 };
 
 extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index dd06e16c4e1c..9edab9050dc7 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -77,6 +77,8 @@ struct ima_field_data {
 	u32 len;
 };
 
+struct ima_namespace;
+
 /* IMA template field definition */
 struct ima_template_field {
 	const char field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN];
@@ -247,18 +249,18 @@ struct ima_key_entry {
 	size_t payload_len;
 	char *keyring_name;
 };
-void ima_init_key_queue(void);
+void ima_init_key_queue(struct ima_namespace *ns);
 bool ima_should_queue_key(void);
 bool ima_queue_key(struct key *keyring, const void *payload,
 		   size_t payload_len);
-void ima_process_queued_keys(void);
+void ima_process_queued_keys(struct ima_namespace *ns);
+void ima_keys_handler(struct work_struct *work);
 #else
-static inline void ima_init_key_queue(void) {}
 static inline bool ima_should_queue_key(void) { return false; }
 static inline bool ima_queue_key(struct key *keyring,
 				 const void *payload,
 				 size_t payload_len) { return false; }
-static inline void ima_process_queued_keys(void) {}
+static inline void ima_process_queued_keys(struct ima_namespace *ns) {}
 #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */
 
 /* LIM API function definitions */
@@ -300,7 +302,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
 		     struct ima_template_desc **template_desc,
 		     const char *func_data, unsigned int *allowed_algos);
 void ima_init_policy(void);
-void ima_update_policy(void);
+void ima_update_policy(struct ima_namespace *ns);
 void ima_update_policy_flags(void);
 ssize_t ima_parse_add_rule(char *);
 void ima_delete_rules(void);
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 3d8e9d5db5aa..5cff3d6c3dc7 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -21,6 +21,7 @@
 #include <linux/rcupdate.h>
 #include <linux/parser.h>
 #include <linux/vmalloc.h>
+#include <linux/ima.h>
 
 #include "ima.h"
 
@@ -410,6 +411,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
 static int ima_release_policy(struct inode *inode, struct file *file)
 {
 	const char *cause = valid_policy ? "completed" : "failed";
+	struct ima_namespace *ns = get_current_ns();
 
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 		return seq_release(inode, file);
@@ -430,7 +432,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 		return 0;
 	}
 
-	ima_update_policy();
+	ima_update_policy(ns);
 #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
 	securityfs_remove(ima_policy);
 	ima_policy = NULL;
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index f6ae4557a0da..24848373a061 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -155,8 +155,6 @@ int __init ima_init(void)
 	if (rc != 0)
 		return rc;
 
-	ima_init_key_queue();
-
 	ima_measure_critical_data("kernel_info", "kernel_version",
 				  UTS_RELEASE, strlen(UTS_RELEASE), false,
 				  NULL, 0);
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index 08781a44f7bf..be31d696bdd3 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -26,6 +26,14 @@ int ima_init_namespace(struct ima_namespace *ns)
 	if (!ns->ns_status_cache)
 		return -ENOMEM;
 
+#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+	INIT_DELAYED_WORK(&ns->ima_keys_delayed_work, ima_keys_handler);
+	ns->ima_key_queue_timeout = 300000;
+	ns->timer_expired = false;
+	if (ns == &init_ima_ns)
+		ima_init_key_queue(ns);
+#endif
+
 	return 0;
 }
 
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 320ca80aacab..e5aef287d14d 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -986,7 +986,7 @@ int ima_check_policy(void)
  * Policy rules are never deleted so ima_policy_flag gets zeroed only once when
  * we switch from the default policy to user defined.
  */
-void ima_update_policy(void)
+void ima_update_policy(struct ima_namespace *ns)
 {
 	struct list_head *policy = &ima_policy_rules;
 
@@ -1007,7 +1007,7 @@ void ima_update_policy(void)
 	ima_update_policy_flags();
 
 	/* Custom IMA policy has been loaded */
-	ima_process_queued_keys();
+	ima_process_queued_keys(ns);
 }
 
 /* Keep the enumeration in sync with the policy_tokens! */
diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
index 93056c03bf5a..fcaa1645dba3 100644
--- a/security/integrity/ima/ima_queue_keys.c
+++ b/security/integrity/ima/ima_queue_keys.c
@@ -10,6 +10,7 @@
 
 #include <linux/user_namespace.h>
 #include <linux/workqueue.h>
+#include <linux/ima.h>
 #include <keys/asymmetric-type.h>
 #include "ima.h"
 
@@ -25,34 +26,27 @@ static bool ima_process_keys;
 static DEFINE_MUTEX(ima_keys_lock);
 static LIST_HEAD(ima_keys);
 
-/*
- * If custom IMA policy is not loaded then keys queued up
- * for measurement should be freed. This worker is used
- * for handling this scenario.
- */
-static long ima_key_queue_timeout = 300000; /* 5 Minutes */
-static void ima_keys_handler(struct work_struct *work);
-static DECLARE_DELAYED_WORK(ima_keys_delayed_work, ima_keys_handler);
-static bool timer_expired;
-
 /*
  * This worker function frees keys that may still be
  * queued up in case custom IMA policy was not loaded.
  */
-static void ima_keys_handler(struct work_struct *work)
+void ima_keys_handler(struct work_struct *work)
 {
-	timer_expired = true;
-	ima_process_queued_keys();
+	struct ima_namespace *ns;
+
+	ns = container_of(work, struct ima_namespace, ima_keys_delayed_work.work);
+	ns->timer_expired = true;
+	ima_process_queued_keys(ns);
 }
 
 /*
  * This function sets up a worker to free queued keys in case
  * custom IMA policy was never loaded.
  */
-void ima_init_key_queue(void)
+void ima_init_key_queue(struct ima_namespace *ns)
 {
-	schedule_delayed_work(&ima_keys_delayed_work,
-			      msecs_to_jiffies(ima_key_queue_timeout));
+	schedule_delayed_work(&ns->ima_keys_delayed_work,
+			      msecs_to_jiffies(ns->ima_key_queue_timeout));
 }
 
 static void ima_free_key_entry(struct ima_key_entry *entry)
@@ -130,7 +124,7 @@ bool ima_queue_key(struct key *keyring, const void *payload,
  * This function sets ima_process_keys to true and processes queued keys.
  * From here on keys will be processed right away (not queued).
  */
-void ima_process_queued_keys(void)
+void ima_process_queued_keys(struct ima_namespace *ns)
 {
 	struct ima_key_entry *entry, *tmp;
 	bool process = false;
@@ -154,11 +148,11 @@ void ima_process_queued_keys(void)
 	if (!process)
 		return;
 
-	if (!timer_expired)
-		cancel_delayed_work_sync(&ima_keys_delayed_work);
+	if (!ns->timer_expired)
+		cancel_delayed_work_sync(&ns->ima_keys_delayed_work);
 
 	list_for_each_entry_safe(entry, tmp, &ima_keys, list) {
-		if (!timer_expired)
+		if (!ns->timer_expired)
 			process_buffer_measurement(&init_user_ns, NULL,
 						   entry->payload,
 						   entry->payload_len,
-- 
2.31.1

[PATCH v6 05/17] ima: Move IMA's keys queue related variables into ima_namespace

[Stefan Berger]

Move variables from keys queue into ima_namespace.

Some variables have to be initialized before ima_init() runs, so statically
initialize them for the init_ima_ns.

Since only init_ima_ns uses the queued keys there's no need to free the
list of queued keys when tearing down IMA namespaces.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                          | 11 ++++++
 security/integrity/ima/ima.h                 |  9 ++---
 security/integrity/ima/ima_asymmetric_keys.c |  5 +--
 security/integrity/ima/ima_init_ima_ns.c     |  5 +++
 security/integrity/ima/ima_ns.c              |  6 ++++
 security/integrity/ima/ima_queue_keys.c      | 37 +++++++-------------
 6 files changed, 43 insertions(+), 30 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 5540ddd39eab..41b6d7d4c312 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -217,6 +217,17 @@ struct ima_namespace {
 	struct kmem_cache *ns_status_cache;
 
 #ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+	/*
+	 * Flag to indicate whether a key can be processed
+	 * right away or should be queued for processing later.
+	 */
+	bool ima_process_keys;
+
+	/*
+	 * To synchronize access to the list of keys that need to be measured
+	 */
+	struct mutex ima_keys_lock;
+	struct list_head ima_keys;
 	/*
 	 * If custom IMA policy is not loaded then keys queued up
 	 * for measurement should be freed. This worker is used
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 9edab9050dc7..97eb03376855 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -250,14 +250,15 @@ struct ima_key_entry {
 	char *keyring_name;
 };
 void ima_init_key_queue(struct ima_namespace *ns);
-bool ima_should_queue_key(void);
-bool ima_queue_key(struct key *keyring, const void *payload,
+bool ima_should_queue_key(struct ima_namespace *ns);
+bool ima_queue_key(struct ima_namespace *ns, struct key *keyring, const void *payload,
 		   size_t payload_len);
 void ima_process_queued_keys(struct ima_namespace *ns);
 void ima_keys_handler(struct work_struct *work);
 #else
-static inline bool ima_should_queue_key(void) { return false; }
-static inline bool ima_queue_key(struct key *keyring,
+static inline bool ima_should_queue_key(struct ima_namespace *ns) { return false; }
+static inline bool ima_queue_key(struct ima_namespace *ns,
+				 struct key *keyring,
 				 const void *payload,
 				 size_t payload_len) { return false; }
 static inline void ima_process_queued_keys(struct ima_namespace *ns) {}
diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index f6aa0b47a772..b20e82eda8f4 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -30,6 +30,7 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
 				   const void *payload, size_t payload_len,
 				   unsigned long flags, bool create)
 {
+	struct ima_namespace *ns = get_current_ns();
 	bool queued = false;
 
 	/* Only asymmetric keys are handled by this hook. */
@@ -39,8 +40,8 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
 	if (!payload || (payload_len == 0))
 		return;
 
-	if (ima_should_queue_key())
-		queued = ima_queue_key(keyring, payload, payload_len);
+	if (ima_should_queue_key(ns))
+		queued = ima_queue_key(ns, keyring, payload, payload_len);
 
 	if (queued)
 		return;
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index be31d696bdd3..d2a36b5251cd 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -43,5 +43,10 @@ int __init ima_ns_init(void)
 }
 
 struct ima_namespace init_ima_ns = {
+#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+	.ima_process_keys = false,
+	.ima_keys_lock = __MUTEX_INITIALIZER(init_ima_ns.ima_keys_lock),
+	.ima_keys = LIST_HEAD_INIT(init_ima_ns.ima_keys),
+#endif
 };
 EXPORT_SYMBOL(init_ima_ns);
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index 472535cd7126..155126038809 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -35,6 +35,12 @@ int create_ima_ns(struct user_namespace *user_ns)
 	if (err)
 		goto fail_free;
 
+#ifdef CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS
+	ns->ima_process_keys = false;
+	mutex_init(&ns->ima_keys_lock);
+	INIT_LIST_HEAD(&ns->ima_keys);
+#endif
+
 	user_ns->ima_ns = ns;
 
 	return 0;
diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
index fcaa1645dba3..9e5e9a178253 100644
--- a/security/integrity/ima/ima_queue_keys.c
+++ b/security/integrity/ima/ima_queue_keys.c
@@ -14,17 +14,6 @@
 #include <keys/asymmetric-type.h>
 #include "ima.h"
 
-/*
- * Flag to indicate whether a key can be processed
- * right away or should be queued for processing later.
- */
-static bool ima_process_keys;
-
-/*
- * To synchronize access to the list of keys that need to be measured
- */
-static DEFINE_MUTEX(ima_keys_lock);
-static LIST_HEAD(ima_keys);
 
 /*
  * This worker function frees keys that may still be
@@ -95,7 +84,7 @@ static struct ima_key_entry *ima_alloc_key_entry(struct key *keyring,
 	return entry;
 }
 
-bool ima_queue_key(struct key *keyring, const void *payload,
+bool ima_queue_key(struct ima_namespace *ns, struct key *keyring, const void *payload,
 		   size_t payload_len)
 {
 	bool queued = false;
@@ -105,12 +94,12 @@ bool ima_queue_key(struct key *keyring, const void *payload,
 	if (!entry)
 		return false;
 
-	mutex_lock(&ima_keys_lock);
-	if (!ima_process_keys) {
-		list_add_tail(&entry->list, &ima_keys);
+	mutex_lock(&ns->ima_keys_lock);
+	if (!ns->ima_process_keys) {
+		list_add_tail(&entry->list, &ns->ima_keys);
 		queued = true;
 	}
-	mutex_unlock(&ima_keys_lock);
+	mutex_unlock(&ns->ima_keys_lock);
 
 	if (!queued)
 		ima_free_key_entry(entry);
@@ -129,7 +118,7 @@ void ima_process_queued_keys(struct ima_namespace *ns)
 	struct ima_key_entry *entry, *tmp;
 	bool process = false;
 
-	if (ima_process_keys)
+	if (ns->ima_process_keys)
 		return;
 
 	/*
@@ -138,12 +127,12 @@ void ima_process_queued_keys(struct ima_namespace *ns)
 	 * First one setting the ima_process_keys flag to true will
 	 * process the queued keys.
 	 */
-	mutex_lock(&ima_keys_lock);
-	if (!ima_process_keys) {
-		ima_process_keys = true;
+	mutex_lock(&ns->ima_keys_lock);
+	if (!ns->ima_process_keys) {
+		ns->ima_process_keys = true;
 		process = true;
 	}
-	mutex_unlock(&ima_keys_lock);
+	mutex_unlock(&ns->ima_keys_lock);
 
 	if (!process)
 		return;
@@ -151,7 +140,7 @@ void ima_process_queued_keys(struct ima_namespace *ns)
 	if (!ns->timer_expired)
 		cancel_delayed_work_sync(&ns->ima_keys_delayed_work);
 
-	list_for_each_entry_safe(entry, tmp, &ima_keys, list) {
+	list_for_each_entry_safe(entry, tmp, &ns->ima_keys, list) {
 		if (!ns->timer_expired)
 			process_buffer_measurement(&init_user_ns, NULL,
 						   entry->payload,
@@ -165,7 +154,7 @@ void ima_process_queued_keys(struct ima_namespace *ns)
 	}
 }
 
-inline bool ima_should_queue_key(void)
+inline bool ima_should_queue_key(struct ima_namespace *ns)
 {
-	return !ima_process_keys;
+	return !ns->ima_process_keys;
 }
-- 
2.31.1

[PATCH v6 06/17] ima: Move policy related variables into ima_namespace

[Stefan Berger]

Move variables related to the IMA policy into the ima_namespace. This way
the IMA policy of an IMA namespace can be set and displayed using a
front-end like SecurityFS.

Implement ima_free_policy_rules() that frees the policy rules on
ima_namespace deletion.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                          |  10 ++
 security/integrity/ima/ima.h                 |  35 ++---
 security/integrity/ima/ima_api.c             |   8 +-
 security/integrity/ima/ima_appraise.c        |  26 ++--
 security/integrity/ima/ima_asymmetric_keys.c |   3 +-
 security/integrity/ima/ima_fs.c              |  10 +-
 security/integrity/ima/ima_init.c            |   8 +-
 security/integrity/ima/ima_init_ima_ns.c     |   6 +
 security/integrity/ima/ima_main.c            |  83 +++++++-----
 security/integrity/ima/ima_ns.c              |   1 +
 security/integrity/ima/ima_policy.c          | 132 +++++++++++--------
 security/integrity/ima/ima_queue_keys.c      |   2 +-
 12 files changed, 196 insertions(+), 128 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 41b6d7d4c312..7a81e2d9fef0 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -237,9 +237,19 @@ struct ima_namespace {
 	long ima_key_queue_timeout;
 	bool timer_expired;
 #endif
+
+	struct list_head ima_default_rules;
+	/* ns's policy rules */
+	struct list_head ima_policy_rules;
+	struct list_head ima_temp_rules;
+	/* Pointer to ns's current policy */
+	struct list_head __rcu *ima_rules;
+	/* current content of the policy */
+	int ima_policy_flag;
 };
 
 extern struct ima_namespace init_ima_ns;
+extern struct list_head ima_default_rules;
 
 #ifdef CONFIG_IMA_NS
 
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 97eb03376855..e295141f2478 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -43,9 +43,6 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
 
 #define NR_BANKS(chip) ((chip != NULL) ? chip->nr_allocated_banks : 0)
 
-/* current content of the policy */
-extern int ima_policy_flag;
-
 /* bitset of digests algorithms allowed in the setxattr hook */
 extern atomic_t ima_setxattr_allowed_hash_algorithms;
 
@@ -265,7 +262,8 @@ static inline void ima_process_queued_keys(struct ima_namespace *ns) {}
 #endif /* CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS */
 
 /* LIM API function definitions */
-int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_get_action(struct ima_namespace *ns,
+		   struct user_namespace *mnt_userns, struct inode *inode,
 		   const struct cred *cred, u32 secid, int mask,
 		   enum ima_hooks func, int *pcr,
 		   struct ima_template_desc **template_desc,
@@ -279,7 +277,8 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
 			   struct evm_ima_xattr_data *xattr_value,
 			   int xattr_len, const struct modsig *modsig, int pcr,
 			   struct ima_template_desc *template_desc);
-int process_buffer_measurement(struct user_namespace *mnt_userns,
+int process_buffer_measurement(struct ima_namespace *ns,
+			       struct user_namespace *mnt_userns,
 			       struct inode *inode, const void *buf, int size,
 			       const char *eventname, enum ima_hooks func,
 			       int pcr, const char *func_data,
@@ -297,17 +296,19 @@ void ima_free_template_entry(struct ima_template_entry *entry);
 const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
 
 /* IMA policy related functions */
-int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_match_policy(struct ima_namespace *ns,
+		     struct user_namespace *mnt_userns, struct inode *inode,
 		     const struct cred *cred, u32 secid, enum ima_hooks func,
 		     int mask, int flags, int *pcr,
 		     struct ima_template_desc **template_desc,
 		     const char *func_data, unsigned int *allowed_algos);
-void ima_init_policy(void);
+void ima_init_policy(struct ima_namespace *ns);
 void ima_update_policy(struct ima_namespace *ns);
-void ima_update_policy_flags(void);
-ssize_t ima_parse_add_rule(char *);
-void ima_delete_rules(void);
-int ima_check_policy(void);
+void ima_update_policy_flags(struct ima_namespace *ns);
+ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule);
+void ima_delete_rules(struct ima_namespace *ns);
+int ima_check_policy(struct ima_namespace *ns);
+void ima_free_policy_rules(struct ima_namespace *ns);
 void *ima_policy_start(struct seq_file *m, loff_t *pos);
 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos);
 void ima_policy_stop(struct seq_file *m, void *v);
@@ -323,14 +324,16 @@ int ima_policy_show(struct seq_file *m, void *v);
 #define IMA_APPRAISE_KEXEC	0x40
 
 #ifdef CONFIG_IMA_APPRAISE
-int ima_check_blacklist(struct integrity_iint_cache *iint,
+int ima_check_blacklist(struct ima_namespace *ns,
+			struct integrity_iint_cache *iint,
 			const struct modsig *modsig, int pcr);
 int ima_appraise_measurement(enum ima_hooks func,
 			     struct integrity_iint_cache *iint,
 			     struct file *file, const unsigned char *filename,
 			     struct evm_ima_xattr_data *xattr_value,
 			     int xattr_len, const struct modsig *modsig);
-int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_must_appraise(struct ima_namespace *ns,
+		      struct user_namespace *mnt_userns, struct inode *inode,
 		      int mask, enum ima_hooks func);
 void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file);
 enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
@@ -341,7 +344,8 @@ int ima_read_xattr(struct dentry *dentry,
 		   struct evm_ima_xattr_data **xattr_value);
 
 #else
-static inline int ima_check_blacklist(struct integrity_iint_cache *iint,
+static inline int ima_check_blacklist(struct ima_namespace *ns,
+				      struct integrity_iint_cache *iint,
 				      const struct modsig *modsig, int pcr)
 {
 	return 0;
@@ -358,7 +362,8 @@ static inline int ima_appraise_measurement(enum ima_hooks func,
 	return INTEGRITY_UNKNOWN;
 }
 
-static inline int ima_must_appraise(struct user_namespace *mnt_userns,
+static inline int ima_must_appraise(struct ima_namespace *ns,
+				    struct user_namespace *mnt_userns,
 				    struct inode *inode, int mask,
 				    enum ima_hooks func)
 {
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 8f7bab17b784..808aec56dbb6 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -14,6 +14,7 @@
 #include <linux/xattr.h>
 #include <linux/evm.h>
 #include <linux/iversion.h>
+#include <linux/ima.h>
 
 #include "ima.h"
 
@@ -185,7 +186,8 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
  * Returns IMA_MEASURE, IMA_APPRAISE mask.
  *
  */
-int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_get_action(struct ima_namespace *ns,
+		   struct user_namespace *mnt_userns, struct inode *inode,
 		   const struct cred *cred, u32 secid, int mask,
 		   enum ima_hooks func, int *pcr,
 		   struct ima_template_desc **template_desc,
@@ -193,9 +195,9 @@ int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode,
 {
 	int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
 
-	flags &= ima_policy_flag;
+	flags &= ns->ima_policy_flag;
 
-	return ima_match_policy(mnt_userns, inode, cred, secid, func, mask,
+	return ima_match_policy(ns, mnt_userns, inode, cred, secid, func, mask,
 				flags, pcr, template_desc, func_data,
 				allowed_algos);
 }
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index dbba51583e7c..b0c1992d8c4b 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -68,7 +68,8 @@ bool is_ima_appraise_enabled(void)
  *
  * Return 1 to appraise or hash
  */
-int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_must_appraise(struct ima_namespace *ns,
+		      struct user_namespace *mnt_userns, struct inode *inode,
 		      int mask, enum ima_hooks func)
 {
 	u32 secid;
@@ -77,7 +78,7 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
 		return 0;
 
 	security_task_getsecid_subj(current, &secid);
-	return ima_match_policy(mnt_userns, inode, current_cred(), secid,
+	return ima_match_policy(ns, mnt_userns, inode, current_cred(), secid,
 				func, mask, IMA_APPRAISE | IMA_HASH, NULL,
 				NULL, NULL, NULL);
 }
@@ -341,7 +342,8 @@ static int modsig_verify(enum ima_hooks func, const struct modsig *modsig,
  *
  * Returns -EPERM if the hash is blacklisted.
  */
-int ima_check_blacklist(struct integrity_iint_cache *iint,
+int ima_check_blacklist(struct ima_namespace *ns,
+			struct integrity_iint_cache *iint,
 			const struct modsig *modsig, int pcr)
 {
 	enum hash_algo hash_algo;
@@ -357,7 +359,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
 
 		rc = is_binary_blacklisted(digest, digestsize);
 		if ((rc == -EPERM) && (iint->flags & IMA_MEASURE))
-			process_buffer_measurement(&init_user_ns, NULL, digest, digestsize,
+			process_buffer_measurement(ns, &init_user_ns, NULL, digest, digestsize,
 						   "blacklisted-hash", NONE,
 						   pcr, NULL, false, NULL, 0);
 	}
@@ -527,14 +529,15 @@ void ima_inode_post_setattr(struct user_namespace *mnt_userns,
 			    struct dentry *dentry)
 {
 	struct inode *inode = d_backing_inode(dentry);
+	struct ima_namespace *ns = get_current_ns();
 	struct integrity_iint_cache *iint;
 	int action;
 
-	if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)
+	if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode)
 	    || !(inode->i_opflags & IOP_XATTR))
 		return;
 
-	action = ima_must_appraise(mnt_userns, inode, MAY_ACCESS, POST_SETATTR);
+	action = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS, POST_SETATTR);
 	iint = integrity_iint_find(inode);
 	if (iint) {
 		set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags);
@@ -559,11 +562,12 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name,
 	return 0;
 }
 
-static void ima_reset_appraise_flags(struct inode *inode, int digsig)
+static void ima_reset_appraise_flags(struct ima_namespace *ns,
+				     struct inode *inode, int digsig)
 {
 	struct integrity_iint_cache *iint;
 
-	if (!(ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode))
+	if (!(ns->ima_policy_flag & IMA_APPRAISE) || !S_ISREG(inode->i_mode))
 		return;
 
 	iint = integrity_iint_find(inode);
@@ -641,6 +645,7 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 		       const void *xattr_value, size_t xattr_value_len)
 {
 	const struct evm_ima_xattr_data *xvalue = xattr_value;
+	struct ima_namespace *ns = get_current_ns();
 	int digsig = 0;
 	int result;
 
@@ -658,18 +663,19 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 		if (result)
 			return result;
 
-		ima_reset_appraise_flags(d_backing_inode(dentry), digsig);
+		ima_reset_appraise_flags(ns, d_backing_inode(dentry), digsig);
 	}
 	return result;
 }
 
 int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name)
 {
+	struct ima_namespace *ns = get_current_ns();
 	int result;
 
 	result = ima_protect_xattr(dentry, xattr_name, NULL, 0);
 	if (result == 1 || evm_revalidate_status(xattr_name)) {
-		ima_reset_appraise_flags(d_backing_inode(dentry), 0);
+		ima_reset_appraise_flags(ns, d_backing_inode(dentry), 0);
 		if (result == 1)
 			result = 0;
 	}
diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index b20e82eda8f4..959e9f2f6c26 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -61,7 +61,8 @@ void ima_post_key_create_or_update(struct key *keyring, struct key *key,
 	 * if the IMA policy is configured to measure a key linked
 	 * to the given keyring.
 	 */
-	process_buffer_measurement(&init_user_ns, NULL, payload, payload_len,
+	process_buffer_measurement(ns, &init_user_ns, NULL,
+				   payload, payload_len,
 				   keyring->description, KEY_CHECK, 0,
 				   keyring->description, false, NULL, 0);
 }
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 5cff3d6c3dc7..25f85c58ebef 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -274,6 +274,7 @@ static const struct file_operations ima_ascii_measurements_ops = {
 
 static ssize_t ima_read_policy(char *path)
 {
+	struct ima_namespace *ns = get_current_ns();
 	void *data = NULL;
 	char *datap;
 	size_t size;
@@ -297,7 +298,7 @@ static ssize_t ima_read_policy(char *path)
 	datap = data;
 	while (size > 0 && (p = strsep(&datap, "\n"))) {
 		pr_debug("rule: %s\n", p);
-		rc = ima_parse_add_rule(p);
+		rc = ima_parse_add_rule(ns, p);
 		if (rc < 0)
 			break;
 		size -= rc;
@@ -315,6 +316,7 @@ static ssize_t ima_read_policy(char *path)
 static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 				size_t datalen, loff_t *ppos)
 {
+	struct ima_namespace *ns = get_current_ns();
 	char *data;
 	ssize_t result;
 
@@ -345,7 +347,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 				    1, 0);
 		result = -EACCES;
 	} else {
-		result = ima_parse_add_rule(data);
+		result = ima_parse_add_rule(ns, data);
 	}
 	mutex_unlock(&ima_write_mutex);
 out_free:
@@ -416,7 +418,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 		return seq_release(inode, file);
 
-	if (valid_policy && ima_check_policy() < 0) {
+	if (valid_policy && ima_check_policy(ns) < 0) {
 		cause = "failed";
 		valid_policy = 0;
 	}
@@ -426,7 +428,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 			    "policy_update", cause, !valid_policy, 0);
 
 	if (!valid_policy) {
-		ima_delete_rules();
+		ima_delete_rules(ns);
 		valid_policy = 1;
 		clear_bit(IMA_FS_BUSY, &ima_fs_flags);
 		return 0;
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 24848373a061..d78f8faf6dcd 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -104,15 +104,15 @@ static int __init ima_add_boot_aggregate(void)
 #ifdef CONFIG_IMA_LOAD_X509
 void __init ima_load_x509(void)
 {
-	int unset_flags = ima_policy_flag & IMA_APPRAISE;
+	int unset_flags = init_ima_ns.ima_policy_flag & IMA_APPRAISE;
 
-	ima_policy_flag &= ~unset_flags;
+	init_ima_ns.ima_policy_flag &= ~unset_flags;
 	integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);
 
 	/* load also EVM key to avoid appraisal */
 	evm_load_x509();
 
-	ima_policy_flag |= unset_flags;
+	init_ima_ns.ima_policy_flag |= unset_flags;
 }
 #endif
 
@@ -149,7 +149,7 @@ int __init ima_init(void)
 	if (rc != 0)
 		return rc;
 
-	ima_init_policy();
+	ima_init_policy(&init_ima_ns);
 
 	rc = ima_fs_init();
 	if (rc != 0)
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index d2a36b5251cd..db7de6811fcc 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -34,6 +34,12 @@ int ima_init_namespace(struct ima_namespace *ns)
 		ima_init_key_queue(ns);
 #endif
 
+	INIT_LIST_HEAD(&ns->ima_default_rules);
+	INIT_LIST_HEAD(&ns->ima_policy_rules);
+	INIT_LIST_HEAD(&ns->ima_temp_rules);
+	ns->ima_rules = (struct list_head __rcu *)(&ns->ima_default_rules);
+	ns->ima_policy_flag = 0;
+
 	return 0;
 }
 
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 4386010a480e..897304046ba4 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -185,10 +185,11 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint,
  */
 void ima_file_free(struct file *file)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint;
 
-	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+	if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
 		return;
 
 	iint = integrity_iint_find(inode);
@@ -198,11 +199,11 @@ void ima_file_free(struct file *file)
 	ima_check_last_writer(iint, inode, file);
 }
 
-static int process_measurement(struct file *file, const struct cred *cred,
+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 ima_namespace *ns = get_current_ns();
 	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint = NULL;
 	struct ns_status *status = NULL;
@@ -220,18 +221,18 @@ static int process_measurement(struct file *file, const struct cred *cred,
 	unsigned int allowed_algos = 0;
 	unsigned long flags;
 
-	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+	if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
 		return 0;
 
 	/* Return an IMA_MEASURE, IMA_APPRAISE, IMA_AUDIT action
 	 * bitmask based on the appraise/audit/measurement policy.
 	 * Included is the appraise submask.
 	 */
-	action = ima_get_action(file_mnt_user_ns(file), inode, cred, secid,
+	action = ima_get_action(ns, file_mnt_user_ns(file), inode, cred, secid,
 				mask, func, &pcr, &template_desc, NULL,
 				&allowed_algos);
 	violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
-			   (ima_policy_flag & IMA_MEASURE));
+			   (ns->ima_policy_flag & IMA_MEASURE));
 	if (!action && !violation_check)
 		return 0;
 
@@ -357,7 +358,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
 				      xattr_value, xattr_len, modsig, pcr,
 				      template_desc);
 	if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) {
-		rc = ima_check_blacklist(iint, modsig, pcr);
+		rc = ima_check_blacklist(ns, iint, modsig, pcr);
 		if (rc != -EPERM) {
 			inode_lock(inode);
 			rc = ima_appraise_measurement(func, iint, file,
@@ -416,12 +417,13 @@ static int process_measurement(struct file *file, const struct cred *cred,
  */
 int ima_file_mmap(struct file *file, unsigned long prot)
 {
+	struct ima_namespace *ns = get_current_ns();
 	u32 secid;
 
 	if (file && (prot & PROT_EXEC)) {
 		security_task_getsecid_subj(current, &secid);
-		return process_measurement(file, current_cred(), secid, NULL,
-					   0, MAY_EXEC, MMAP_CHECK);
+		return process_measurement(ns, file, current_cred(), secid,
+					   NULL, 0, MAY_EXEC, MMAP_CHECK);
 	}
 
 	return 0;
@@ -441,6 +443,7 @@ int ima_file_mmap(struct file *file, unsigned long prot)
  */
 int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct ima_template_desc *template = NULL;
 	struct file *file = vma->vm_file;
 	char filename[NAME_MAX];
@@ -453,13 +456,13 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
 	int pcr;
 
 	/* Is mprotect making an mmap'ed file executable? */
-	if (!(ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
+	if (!(ns->ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
 	    !(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC))
 		return 0;
 
 	security_task_getsecid_subj(current, &secid);
 	inode = file_inode(vma->vm_file);
-	action = ima_get_action(file_mnt_user_ns(vma->vm_file), inode,
+	action = ima_get_action(ns, file_mnt_user_ns(vma->vm_file), inode,
 				current_cred(), secid, MAY_EXEC, MMAP_CHECK,
 				&pcr, &template, NULL, NULL);
 
@@ -495,17 +498,18 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
  */
 int ima_bprm_check(struct linux_binprm *bprm)
 {
+	struct ima_namespace *ns = get_current_ns();
 	int ret;
 	u32 secid;
 
 	security_task_getsecid_subj(current, &secid);
-	ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
-				  MAY_EXEC, BPRM_CHECK);
+	ret = process_measurement(ns, bprm->file, current_cred(), secid, NULL,
+				  0, MAY_EXEC, BPRM_CHECK);
 	if (ret)
 		return ret;
 
 	security_cred_getsecid(bprm->cred, &secid);
-	return process_measurement(bprm->file, bprm->cred, secid, NULL, 0,
+	return process_measurement(ns, bprm->file, bprm->cred, secid, NULL, 0,
 				   MAY_EXEC, CREDS_CHECK);
 }
 
@@ -521,21 +525,23 @@ int ima_bprm_check(struct linux_binprm *bprm)
  */
 int ima_file_check(struct file *file, int mask)
 {
+	struct ima_namespace *ns = get_current_ns();
 	u32 secid;
 
 	security_task_getsecid_subj(current, &secid);
-	return process_measurement(file, current_cred(), secid, NULL, 0,
+	return process_measurement(ns, file, current_cred(), secid, NULL, 0,
 				   mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
 					   MAY_APPEND), FILE_CHECK);
 }
 EXPORT_SYMBOL_GPL(ima_file_check);
 
-static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
+static int __ima_inode_hash(struct ima_namespace *ns,
+			    struct inode *inode, char *buf, size_t buf_size)
 {
 	struct integrity_iint_cache *iint;
 	int hash_algo;
 
-	if (!ima_policy_flag)
+	if (!ns->ima_policy_flag)
 		return -EOPNOTSUPP;
 
 	iint = integrity_iint_find(inode);
@@ -585,10 +591,12 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
  */
 int ima_file_hash(struct file *file, char *buf, size_t buf_size)
 {
+	struct ima_namespace *ns = get_current_ns();
+
 	if (!file)
 		return -EINVAL;
 
-	return __ima_inode_hash(file_inode(file), buf, buf_size);
+	return __ima_inode_hash(ns, file_inode(file), buf, buf_size);
 }
 EXPORT_SYMBOL_GPL(ima_file_hash);
 
@@ -612,10 +620,12 @@ EXPORT_SYMBOL_GPL(ima_file_hash);
  */
 int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
 {
+	struct ima_namespace *ns = get_current_ns();
+
 	if (!inode)
 		return -EINVAL;
 
-	return __ima_inode_hash(inode, buf, buf_size);
+	return __ima_inode_hash(ns, inode, buf, buf_size);
 }
 EXPORT_SYMBOL_GPL(ima_inode_hash);
 
@@ -631,13 +641,14 @@ EXPORT_SYMBOL_GPL(ima_inode_hash);
 void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
 			     struct inode *inode)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct integrity_iint_cache *iint;
 	int must_appraise;
 
-	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+	if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
 		return;
 
-	must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
+	must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
 					  FILE_CHECK);
 	if (!must_appraise)
 		return;
@@ -663,14 +674,15 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
 void ima_post_path_mknod(struct user_namespace *mnt_userns,
 			 struct dentry *dentry)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct integrity_iint_cache *iint;
 	struct inode *inode = dentry->d_inode;
 	int must_appraise;
 
-	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+	if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
 		return;
 
-	must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
+	must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
 					  FILE_CHECK);
 	if (!must_appraise)
 		return;
@@ -699,6 +711,7 @@ void ima_post_path_mknod(struct user_namespace *mnt_userns,
 int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
 		  bool contents)
 {
+	struct ima_namespace *ns = get_current_ns();
 	enum ima_hooks func;
 	u32 secid;
 
@@ -721,7 +734,7 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id,
 	/* Read entire file for all partial reads. */
 	func = read_idmap[read_id] ?: FILE_CHECK;
 	security_task_getsecid_subj(current, &secid);
-	return process_measurement(file, current_cred(), secid, NULL,
+	return process_measurement(ns, file, current_cred(), secid, NULL,
 				   0, MAY_READ, func);
 }
 
@@ -749,6 +762,7 @@ const int read_idmap[READING_MAX_ID] = {
 int ima_post_read_file(struct file *file, void *buf, loff_t size,
 		       enum kernel_read_file_id read_id)
 {
+	struct ima_namespace *ns = get_current_ns();
 	enum ima_hooks func;
 	u32 secid;
 
@@ -764,7 +778,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
 
 	func = read_idmap[read_id] ?: FILE_CHECK;
 	security_task_getsecid_subj(current, &secid);
-	return process_measurement(file, current_cred(), secid, buf, size,
+	return process_measurement(ns, file, current_cred(), secid, buf, size,
 				   MAY_READ, func);
 }
 
@@ -870,7 +884,8 @@ int ima_post_load_data(char *buf, loff_t size,
  * has been written to the passed location but not added to a measurement entry,
  * a negative value otherwise.
  */
-int process_buffer_measurement(struct user_namespace *mnt_userns,
+int process_buffer_measurement(struct ima_namespace *ns,
+			       struct user_namespace *mnt_userns,
 			       struct inode *inode, const void *buf, int size,
 			       const char *eventname, enum ima_hooks func,
 			       int pcr, const char *func_data,
@@ -898,7 +913,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
 	if (digest && digest_len < digest_hash_len)
 		return -EINVAL;
 
-	if (!ima_policy_flag && !digest)
+	if (!ns->ima_policy_flag && !digest)
 		return -ENOENT;
 
 	template = ima_template_desc_buf();
@@ -917,7 +932,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
 	 */
 	if (func) {
 		security_task_getsecid_subj(current, &secid);
-		action = ima_get_action(mnt_userns, inode, current_cred(),
+		action = ima_get_action(ns, mnt_userns, inode, current_cred(),
 					secid, 0, func, &pcr, &template,
 					func_data, NULL);
 		if (!(action & IMA_MEASURE) && !digest)
@@ -954,7 +969,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
 	if (digest)
 		memcpy(digest, iint.ima_hash->digest, digest_hash_len);
 
-	if (!ima_policy_flag || (func && !(action & IMA_MEASURE)))
+	if (!ns->ima_policy_flag || (func && !(action & IMA_MEASURE)))
 		return 1;
 
 	ret = ima_alloc_init_template(&event_data, &entry, template);
@@ -988,6 +1003,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns,
  */
 void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct fd f;
 
 	if (!buf || !size)
@@ -997,7 +1013,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
 	if (!f.file)
 		return;
 
-	process_buffer_measurement(file_mnt_user_ns(f.file), file_inode(f.file),
+	process_buffer_measurement(ns,
+				   file_mnt_user_ns(f.file), file_inode(f.file),
 				   buf, size, "kexec-cmdline", KEXEC_CMDLINE, 0,
 				   NULL, false, NULL, 0);
 	fdput(f);
@@ -1027,10 +1044,12 @@ int ima_measure_critical_data(const char *event_label,
 			      const void *buf, size_t buf_len,
 			      bool hash, u8 *digest, size_t digest_len)
 {
+	struct ima_namespace *ns = get_current_ns();
+
 	if (!event_name || !event_label || !buf || !buf_len)
 		return -ENOPARAM;
 
-	return process_buffer_measurement(&init_user_ns, NULL, buf, buf_len,
+	return process_buffer_measurement(ns, &init_user_ns, NULL, buf, buf_len,
 					  event_name, CRITICAL_DATA, 0,
 					  event_label, hash, digest,
 					  digest_len);
@@ -1063,7 +1082,7 @@ static int __init init_ima(void)
 		pr_warn("Couldn't register LSM notifier, error %d\n", error);
 
 	if (!error)
-		ima_update_policy_flags();
+		ima_update_policy_flags(&init_ima_ns);
 
 	return error;
 }
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index 155126038809..9d97f45fa8e4 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -54,6 +54,7 @@ int create_ima_ns(struct user_namespace *user_ns)
 static void destroy_ima_ns(struct ima_namespace *ns)
 {
 	pr_debug("DESTROY ima_ns: 0x%p\n", ns);
+	ima_free_policy_rules(ns);
 	free_ns_status_cache(ns);
 	kmem_cache_free(imans_cachep, ns);
 }
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e5aef287d14d..4d6d3a39f65e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -52,7 +52,6 @@
 #define INVALID_PCR(a) (((a) < 0) || \
 	(a) >= (sizeof_field(struct integrity_iint_cache, measured_pcrs) * 8))
 
-int ima_policy_flag;
 static int temp_ima_appraise;
 static int build_ima_appraise __ro_after_init;
 
@@ -233,11 +232,6 @@ static struct ima_rule_entry critical_data_rules[] __ro_after_init = {
 /* An array of architecture specific rules */
 static struct ima_rule_entry *arch_policy_entry __ro_after_init;
 
-static LIST_HEAD(ima_default_rules);
-static LIST_HEAD(ima_policy_rules);
-static LIST_HEAD(ima_temp_rules);
-static struct list_head __rcu *ima_rules = (struct list_head __rcu *)(&ima_default_rules);
-
 static int ima_policy __initdata;
 
 static int __init default_measure_policy_setup(char *str)
@@ -454,12 +448,12 @@ static bool ima_rule_contains_lsm_cond(struct ima_rule_entry *entry)
  * to the old, stale LSM policy.  Update the IMA LSM based rules to reflect
  * the reloaded LSM policy.
  */
-static void ima_lsm_update_rules(void)
+static void ima_lsm_update_rules(struct ima_namespace *ns)
 {
 	struct ima_rule_entry *entry, *e;
 	int result;
 
-	list_for_each_entry_safe(entry, e, &ima_policy_rules, list) {
+	list_for_each_entry_safe(entry, e, &ns->ima_policy_rules, list) {
 		if (!ima_rule_contains_lsm_cond(entry))
 			continue;
 
@@ -474,10 +468,12 @@ static void ima_lsm_update_rules(void)
 int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
 			  void *lsm_data)
 {
+	struct ima_namespace *ns = get_current_ns();
+
 	if (event != LSM_POLICY_CHANGE)
 		return NOTIFY_DONE;
 
-	ima_lsm_update_rules();
+	ima_lsm_update_rules(ns);
 	return NOTIFY_OK;
 }
 
@@ -688,7 +684,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
  * list when walking it.  Reads are many orders of magnitude more numerous
  * than writes so ima_match_policy() is classical RCU candidate.
  */
-int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
+int ima_match_policy(struct ima_namespace *ns,
+		     struct user_namespace *mnt_userns, struct inode *inode,
 		     const struct cred *cred, u32 secid, enum ima_hooks func,
 		     int mask, int flags, int *pcr,
 		     struct ima_template_desc **template_desc,
@@ -702,7 +699,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
 		*template_desc = ima_template_desc_current();
 
 	rcu_read_lock();
-	ima_rules_tmp = rcu_dereference(ima_rules);
+	ima_rules_tmp = rcu_dereference(ns->ima_rules);
 	list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
 
 		if (!(entry->action & actmask))
@@ -760,14 +757,14 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode,
  *
  * Context: called after a policy update and at system initialization.
  */
-void ima_update_policy_flags(void)
+void ima_update_policy_flags(struct ima_namespace *ns)
 {
 	struct ima_rule_entry *entry;
 	int new_policy_flag = 0;
 	struct list_head *ima_rules_tmp;
 
 	rcu_read_lock();
-	ima_rules_tmp = rcu_dereference(ima_rules);
+	ima_rules_tmp = rcu_dereference(ns->ima_rules);
 	list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
 		/*
 		 * SETXATTR_CHECK rules do not implement a full policy check
@@ -797,7 +794,7 @@ void ima_update_policy_flags(void)
 	if (!ima_appraise)
 		new_policy_flag &= ~IMA_APPRAISE;
 
-	ima_policy_flag = new_policy_flag;
+	ns->ima_policy_flag = new_policy_flag;
 }
 
 static int ima_appraise_flag(enum ima_hooks func)
@@ -813,7 +810,8 @@ static int ima_appraise_flag(enum ima_hooks func)
 	return 0;
 }
 
-static void add_rules(struct ima_rule_entry *entries, int count,
+static void add_rules(struct ima_namespace *ns,
+		      struct ima_rule_entry *entries, int count,
 		      enum policy_rule_list policy_rule)
 {
 	int i = 0;
@@ -822,7 +820,7 @@ static void add_rules(struct ima_rule_entry *entries, int count,
 		struct ima_rule_entry *entry;
 
 		if (policy_rule & IMA_DEFAULT_POLICY)
-			list_add_tail(&entries[i].list, &ima_default_rules);
+			list_add_tail(&entries[i].list, &ns->ima_default_rules);
 
 		if (policy_rule & IMA_CUSTOM_POLICY) {
 			entry = kmemdup(&entries[i], sizeof(*entry),
@@ -830,7 +828,7 @@ static void add_rules(struct ima_rule_entry *entries, int count,
 			if (!entry)
 				continue;
 
-			list_add_tail(&entry->list, &ima_policy_rules);
+			list_add_tail(&entry->list, &ns->ima_policy_rules);
 		}
 		if (entries[i].action == APPRAISE) {
 			if (entries != build_appraise_rules)
@@ -843,9 +841,10 @@ static void add_rules(struct ima_rule_entry *entries, int count,
 	}
 }
 
-static int ima_parse_rule(char *rule, struct ima_rule_entry *entry);
+static int ima_parse_rule(struct ima_namespace *ns,
+			  char *rule, struct ima_rule_entry *entry);
 
-static int __init ima_init_arch_policy(void)
+static int __init ima_init_arch_policy(struct ima_namespace *ns)
 {
 	const char * const *arch_rules;
 	const char * const *rules;
@@ -873,7 +872,7 @@ static int __init ima_init_arch_policy(void)
 		result = strscpy(rule, *rules, sizeof(rule));
 
 		INIT_LIST_HEAD(&arch_policy_entry[i].list);
-		result = ima_parse_rule(rule, &arch_policy_entry[i]);
+		result = ima_parse_rule(ns, rule, &arch_policy_entry[i]);
 		if (result) {
 			pr_warn("Skipping unknown architecture policy rule: %s\n",
 				rule);
@@ -891,23 +890,23 @@ static int __init ima_init_arch_policy(void)
  *
  * ima_rules points to either the ima_default_rules or the new ima_policy_rules.
  */
-void __init ima_init_policy(void)
+void __init ima_init_policy(struct ima_namespace *ns)
 {
 	int build_appraise_entries, arch_entries;
 
 	/* if !ima_policy, we load NO default rules */
 	if (ima_policy)
-		add_rules(dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
+		add_rules(ns, dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
 			  IMA_DEFAULT_POLICY);
 
 	switch (ima_policy) {
 	case ORIGINAL_TCB:
-		add_rules(original_measurement_rules,
+		add_rules(ns, original_measurement_rules,
 			  ARRAY_SIZE(original_measurement_rules),
 			  IMA_DEFAULT_POLICY);
 		break;
 	case DEFAULT_TCB:
-		add_rules(default_measurement_rules,
+		add_rules(ns, default_measurement_rules,
 			  ARRAY_SIZE(default_measurement_rules),
 			  IMA_DEFAULT_POLICY);
 		break;
@@ -921,11 +920,11 @@ void __init ima_init_policy(void)
 	 * and custom policies, prior to other appraise rules.
 	 * (Highest priority)
 	 */
-	arch_entries = ima_init_arch_policy();
+	arch_entries = ima_init_arch_policy(ns);
 	if (!arch_entries)
 		pr_info("No architecture policies found\n");
 	else
-		add_rules(arch_policy_entry, arch_entries,
+		add_rules(ns, arch_policy_entry, arch_entries,
 			  IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
 
 	/*
@@ -933,7 +932,7 @@ void __init ima_init_policy(void)
 	 * signatures, prior to other appraise rules.
 	 */
 	if (ima_use_secure_boot)
-		add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
+		add_rules(ns, secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
 			  IMA_DEFAULT_POLICY);
 
 	/*
@@ -945,32 +944,32 @@ void __init ima_init_policy(void)
 	build_appraise_entries = ARRAY_SIZE(build_appraise_rules);
 	if (build_appraise_entries) {
 		if (ima_use_secure_boot)
-			add_rules(build_appraise_rules, build_appraise_entries,
+			add_rules(ns, build_appraise_rules, build_appraise_entries,
 				  IMA_CUSTOM_POLICY);
 		else
-			add_rules(build_appraise_rules, build_appraise_entries,
+			add_rules(ns, build_appraise_rules, build_appraise_entries,
 				  IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
 	}
 
 	if (ima_use_appraise_tcb)
-		add_rules(default_appraise_rules,
+		add_rules(ns, default_appraise_rules,
 			  ARRAY_SIZE(default_appraise_rules),
 			  IMA_DEFAULT_POLICY);
 
 	if (ima_use_critical_data)
-		add_rules(critical_data_rules,
+		add_rules(ns, critical_data_rules,
 			  ARRAY_SIZE(critical_data_rules),
 			  IMA_DEFAULT_POLICY);
 
 	atomic_set(&ima_setxattr_allowed_hash_algorithms, 0);
 
-	ima_update_policy_flags();
+	ima_update_policy_flags(ns);
 }
 
 /* Make sure we have a valid policy, at least containing some rules. */
-int ima_check_policy(void)
+int ima_check_policy(struct ima_namespace *ns)
 {
-	if (list_empty(&ima_temp_rules))
+	if (list_empty(&ns->ima_temp_rules))
 		return -EINVAL;
 	return 0;
 }
@@ -988,14 +987,14 @@ int ima_check_policy(void)
  */
 void ima_update_policy(struct ima_namespace *ns)
 {
-	struct list_head *policy = &ima_policy_rules;
+	struct list_head *policy = &ns->ima_policy_rules;
 
-	list_splice_tail_init_rcu(&ima_temp_rules, policy, synchronize_rcu);
+	list_splice_tail_init_rcu(&ns->ima_temp_rules, policy, synchronize_rcu);
 
-	if (ima_rules != (struct list_head __rcu *)policy) {
-		ima_policy_flag = 0;
+	if (ns->ima_rules != (struct list_head __rcu *)policy) {
+		ns->ima_policy_flag = 0;
 
-		rcu_assign_pointer(ima_rules, policy);
+		rcu_assign_pointer(ns->ima_rules, policy);
 		/*
 		 * IMA architecture specific policy rules are specified
 		 * as strings and converted to an array of ima_entry_rules
@@ -1004,7 +1003,7 @@ void ima_update_policy(struct ima_namespace *ns)
 		 */
 		kfree(arch_policy_entry);
 	}
-	ima_update_policy_flags();
+	ima_update_policy_flags(ns);
 
 	/* Custom IMA policy has been loaded */
 	ima_process_queued_keys(ns);
@@ -1077,7 +1076,8 @@ static const match_table_t policy_tokens = {
 	{Opt_err, NULL}
 };
 
-static int ima_lsm_rule_init(struct ima_rule_entry *entry,
+static int ima_lsm_rule_init(struct ima_namespace *ns,
+			     struct ima_rule_entry *entry,
 			     substring_t *args, int lsm_rule, int audit_type)
 {
 	int result;
@@ -1097,7 +1097,7 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry,
 		pr_warn("rule for LSM \'%s\' is undefined\n",
 			entry->lsm[lsm_rule].args_p);
 
-		if (ima_rules == (struct list_head __rcu *)(&ima_default_rules)) {
+		if (ns->ima_rules == (struct list_head __rcu *)(&ns->ima_default_rules)) {
 			kfree(entry->lsm[lsm_rule].args_p);
 			entry->lsm[lsm_rule].args_p = NULL;
 			result = -EINVAL;
@@ -1324,7 +1324,8 @@ static unsigned int ima_parse_appraise_algos(char *arg)
 	return res;
 }
 
-static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
+static int ima_parse_rule(struct ima_namespace *ns,
+			  char *rule, struct ima_rule_entry *entry)
 {
 	struct audit_buffer *ab;
 	char *from;
@@ -1674,37 +1675,37 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 			break;
 		case Opt_obj_user:
 			ima_log_string(ab, "obj_user", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_OBJ_USER,
 						   AUDIT_OBJ_USER);
 			break;
 		case Opt_obj_role:
 			ima_log_string(ab, "obj_role", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_OBJ_ROLE,
 						   AUDIT_OBJ_ROLE);
 			break;
 		case Opt_obj_type:
 			ima_log_string(ab, "obj_type", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_OBJ_TYPE,
 						   AUDIT_OBJ_TYPE);
 			break;
 		case Opt_subj_user:
 			ima_log_string(ab, "subj_user", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_SUBJ_USER,
 						   AUDIT_SUBJ_USER);
 			break;
 		case Opt_subj_role:
 			ima_log_string(ab, "subj_role", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_SUBJ_ROLE,
 						   AUDIT_SUBJ_ROLE);
 			break;
 		case Opt_subj_type:
 			ima_log_string(ab, "subj_type", args[0].from);
-			result = ima_lsm_rule_init(entry, args,
+			result = ima_lsm_rule_init(ns, entry, args,
 						   LSM_SUBJ_TYPE,
 						   AUDIT_SUBJ_TYPE);
 			break;
@@ -1810,7 +1811,7 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
  * Avoid locking by allowing just one writer at a time in ima_write_policy()
  * Returns the length of the rule parsed, an error code on failure
  */
-ssize_t ima_parse_add_rule(char *rule)
+ssize_t ima_parse_add_rule(struct ima_namespace *ns, char *rule)
 {
 	static const char op[] = "update_policy";
 	char *p;
@@ -1834,7 +1835,7 @@ ssize_t ima_parse_add_rule(char *rule)
 
 	INIT_LIST_HEAD(&entry->list);
 
-	result = ima_parse_rule(p, entry);
+	result = ima_parse_rule(ns, p, entry);
 	if (result) {
 		ima_free_rule(entry);
 		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
@@ -1843,7 +1844,7 @@ ssize_t ima_parse_add_rule(char *rule)
 		return result;
 	}
 
-	list_add_tail(&entry->list, &ima_temp_rules);
+	list_add_tail(&entry->list, &ns->ima_temp_rules);
 
 	return len;
 }
@@ -1854,12 +1855,24 @@ ssize_t ima_parse_add_rule(char *rule)
  * different from the active one.  There is also only one user of
  * ima_delete_rules() at a time.
  */
-void ima_delete_rules(void)
+void ima_delete_rules(struct ima_namespace *ns)
 {
 	struct ima_rule_entry *entry, *tmp;
 
 	temp_ima_appraise = 0;
-	list_for_each_entry_safe(entry, tmp, &ima_temp_rules, list) {
+	list_for_each_entry_safe(entry, tmp, &ns->ima_temp_rules, list) {
+		list_del(&entry->list);
+		ima_free_rule(entry);
+	}
+}
+
+void ima_free_policy_rules(struct ima_namespace *ns)
+{
+	struct ima_rule_entry *entry, *tmp;
+
+	ima_delete_rules(ns);
+
+	list_for_each_entry_safe(entry, tmp, &ns->ima_policy_rules, list) {
 		list_del(&entry->list);
 		ima_free_rule(entry);
 	}
@@ -1885,12 +1898,13 @@ static const char *const mask_tokens[] = {
 
 void *ima_policy_start(struct seq_file *m, loff_t *pos)
 {
+	struct ima_namespace *ns = get_current_ns();
 	loff_t l = *pos;
 	struct ima_rule_entry *entry;
 	struct list_head *ima_rules_tmp;
 
 	rcu_read_lock();
-	ima_rules_tmp = rcu_dereference(ima_rules);
+	ima_rules_tmp = rcu_dereference(ns->ima_rules);
 	list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
 		if (!l--) {
 			rcu_read_unlock();
@@ -1904,14 +1918,15 @@ void *ima_policy_start(struct seq_file *m, loff_t *pos)
 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct ima_rule_entry *entry = v;
+	struct ima_namespace *ns = get_current_ns();
 
 	rcu_read_lock();
 	entry = list_entry_rcu(entry->list.next, struct ima_rule_entry, list);
 	rcu_read_unlock();
 	(*pos)++;
 
-	return (&entry->list == &ima_default_rules ||
-		&entry->list == &ima_policy_rules) ? NULL : entry;
+	return (&entry->list == &ns->ima_default_rules ||
+		&entry->list == &ns->ima_policy_rules) ? NULL : entry;
 }
 
 void ima_policy_stop(struct seq_file *m, void *v)
@@ -2166,6 +2181,7 @@ int ima_policy_show(struct seq_file *m, void *v)
  */
 bool ima_appraise_signature(enum kernel_read_file_id id)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct ima_rule_entry *entry;
 	bool found = false;
 	enum ima_hooks func;
@@ -2177,7 +2193,7 @@ bool ima_appraise_signature(enum kernel_read_file_id id)
 	func = read_idmap[id] ?: FILE_CHECK;
 
 	rcu_read_lock();
-	ima_rules_tmp = rcu_dereference(ima_rules);
+	ima_rules_tmp = rcu_dereference(ns->ima_rules);
 	list_for_each_entry_rcu(entry, ima_rules_tmp, list) {
 		if (entry->action != APPRAISE)
 			continue;
diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
index 9e5e9a178253..14f334272160 100644
--- a/security/integrity/ima/ima_queue_keys.c
+++ b/security/integrity/ima/ima_queue_keys.c
@@ -142,7 +142,7 @@ void ima_process_queued_keys(struct ima_namespace *ns)
 
 	list_for_each_entry_safe(entry, tmp, &ns->ima_keys, list) {
 		if (!ns->timer_expired)
-			process_buffer_measurement(&init_user_ns, NULL,
+			process_buffer_measurement(ns, &init_user_ns, NULL,
 						   entry->payload,
 						   entry->payload_len,
 						   entry->keyring_name,
-- 
2.31.1

[PATCH v6 07/17] ima: Move ima_htable into ima_namespace

[Stefan Berger]

Move ima_htable into ima_namespace. This way a front-end like
SecurityFS can show the number of violations of an IMA namespace.

Move ima_hash_key() into ima_queue.c since it's only used there.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                      | 11 +++++++
 security/integrity/ima/ima.h             | 34 +++++++------------
 security/integrity/ima/ima_api.c         | 17 ++++++----
 security/integrity/ima/ima_fs.c          |  7 ++--
 security/integrity/ima/ima_init.c        |  6 ++--
 security/integrity/ima/ima_init_ima_ns.c |  4 +++
 security/integrity/ima/ima_kexec.c       |  3 +-
 security/integrity/ima/ima_main.c        | 13 ++++----
 security/integrity/ima/ima_queue.c       | 42 ++++++++++++++----------
 security/integrity/ima/ima_template.c    |  4 +--
 10 files changed, 80 insertions(+), 61 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 7a81e2d9fef0..65d28fa060c2 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -211,6 +211,15 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
 }
 #endif /* CONFIG_IMA_APPRAISE */
 
+#define IMA_HASH_BITS 10
+#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
+
+struct ima_h_table {
+	atomic_long_t len;	/* number of stored measurements in the list */
+	atomic_long_t violations;
+	struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
+};
+
 struct ima_namespace {
 	struct rb_root ns_status_tree;
 	rwlock_t ns_status_lock;
@@ -246,6 +255,8 @@ struct ima_namespace {
 	struct list_head __rcu *ima_rules;
 	/* current content of the policy */
 	int ima_policy_flag;
+
+	struct ima_h_table ima_htable;
 };
 
 extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index e295141f2478..a7e6c8fb152a 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -32,9 +32,6 @@ enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
 #define IMA_DIGEST_SIZE		SHA1_DIGEST_SIZE
 #define IMA_EVENT_NAME_LEN_MAX	255
 
-#define IMA_HASH_BITS 10
-#define IMA_MEASURE_HTABLE_SIZE (1 << IMA_HASH_BITS)
-
 #define IMA_TEMPLATE_FIELD_ID_MAX_LEN	16
 #define IMA_TEMPLATE_NUM_FIELDS_MAX	15
 
@@ -143,7 +140,8 @@ struct ns_status {
 /* Internal IMA function definitions */
 int ima_init(void);
 int ima_fs_init(void);
-int ima_add_template_entry(struct ima_template_entry *entry, int violation,
+int ima_add_template_entry(struct ima_namespace *ns,
+			   struct ima_template_entry *entry, int violation,
 			   const char *op, struct inode *inode,
 			   const unsigned char *filename);
 int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
@@ -152,7 +150,8 @@ int ima_calc_buffer_hash(const void *buf, loff_t len,
 int ima_calc_field_array_hash(struct ima_field_data *field_data,
 			      struct ima_template_entry *entry);
 int ima_calc_boot_aggregate(struct ima_digest_data *hash);
-void ima_add_violation(struct file *file, const unsigned char *filename,
+void ima_add_violation(struct ima_namespace *ns,
+		       struct file *file, const unsigned char *filename,
 		       struct integrity_iint_cache *iint,
 		       const char *op, const char *cause);
 int ima_init_crypto(void);
@@ -165,8 +164,10 @@ struct ima_template_desc *ima_template_desc_current(void);
 struct ima_template_desc *ima_template_desc_buf(void);
 struct ima_template_desc *lookup_template_desc(const char *name);
 bool ima_template_has_modsig(const struct ima_template_desc *ima_template);
-int ima_restore_measurement_entry(struct ima_template_entry *entry);
-int ima_restore_measurement_list(loff_t bufsize, void *buf);
+int ima_restore_measurement_entry(struct ima_namespace *ns,
+				  struct ima_template_entry *entry);
+int ima_restore_measurement_list(struct ima_namespace *ns,
+				 loff_t bufsize, void *buf);
 int ima_measurements_show(struct seq_file *m, void *v);
 unsigned long ima_get_binary_runtime_size(void);
 int ima_init_template(void);
@@ -180,19 +181,6 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
  */
 extern spinlock_t ima_queue_lock;
 
-struct ima_h_table {
-	atomic_long_t len;	/* number of stored measurements in the list */
-	atomic_long_t violations;
-	struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE];
-};
-extern struct ima_h_table ima_htable;
-
-static inline unsigned int ima_hash_key(u8 *digest)
-{
-	/* there is no point in taking a hash of part of a digest */
-	return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
-}
-
 #define __ima_hooks(hook)				\
 	hook(NONE, none)				\
 	hook(FILE_CHECK, file)				\
@@ -272,7 +260,8 @@ int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
 int ima_collect_measurement(struct integrity_iint_cache *iint,
 			    struct file *file, void *buf, loff_t size,
 			    enum hash_algo algo, struct modsig *modsig);
-void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
+void ima_store_measurement(struct ima_namespace *ns,
+			   struct integrity_iint_cache *iint, struct file *file,
 			   const unsigned char *filename,
 			   struct evm_ima_xattr_data *xattr_value,
 			   int xattr_len, const struct modsig *modsig, int pcr,
@@ -289,7 +278,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
 int ima_alloc_init_template(struct ima_event_data *event_data,
 			    struct ima_template_entry **entry,
 			    struct ima_template_desc *template_desc);
-int ima_store_template(struct ima_template_entry *entry, int violation,
+int ima_store_template(struct ima_namespace *ns,
+		       struct ima_template_entry *entry, int violation,
 		       struct inode *inode,
 		       const unsigned char *filename, int pcr);
 void ima_free_template_entry(struct ima_template_entry *entry);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 808aec56dbb6..71c5517fe8bc 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -100,7 +100,8 @@ int ima_alloc_init_template(struct ima_event_data *event_data,
  *
  * Returns 0 on success, error code otherwise
  */
-int ima_store_template(struct ima_template_entry *entry,
+int ima_store_template(struct ima_namespace *ns,
+		       struct ima_template_entry *entry,
 		       int violation, struct inode *inode,
 		       const unsigned char *filename, int pcr)
 {
@@ -120,7 +121,7 @@ int ima_store_template(struct ima_template_entry *entry,
 		}
 	}
 	entry->pcr = pcr;
-	result = ima_add_template_entry(entry, violation, op, inode, filename);
+	result = ima_add_template_entry(ns, entry, violation, op, inode, filename);
 	return result;
 }
 
@@ -131,7 +132,8 @@ int ima_store_template(struct ima_template_entry *entry,
  * By extending the PCR with 0xFF's instead of with zeroes, the PCR
  * value is invalidated.
  */
-void ima_add_violation(struct file *file, const unsigned char *filename,
+void ima_add_violation(struct ima_namespace *ns,
+		       struct file *file, const unsigned char *filename,
 		       struct integrity_iint_cache *iint,
 		       const char *op, const char *cause)
 {
@@ -145,14 +147,14 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
 	int result;
 
 	/* can overflow, only indicator */
-	atomic_long_inc(&ima_htable.violations);
+	atomic_long_inc(&ns->ima_htable.violations);
 
 	result = ima_alloc_init_template(&event_data, &entry, NULL);
 	if (result < 0) {
 		result = -ENOMEM;
 		goto err_out;
 	}
-	result = ima_store_template(entry, violation, inode,
+	result = ima_store_template(ns, entry, violation, inode,
 				    filename, CONFIG_IMA_MEASURE_PCR_IDX);
 	if (result < 0)
 		ima_free_template_entry(entry);
@@ -299,7 +301,8 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
  *
  * Must be called with iint->mutex held.
  */
-void ima_store_measurement(struct integrity_iint_cache *iint,
+void ima_store_measurement(struct ima_namespace *ns,
+			   struct integrity_iint_cache *iint,
 			   struct file *file, const unsigned char *filename,
 			   struct evm_ima_xattr_data *xattr_value,
 			   int xattr_len, const struct modsig *modsig, int pcr,
@@ -334,7 +337,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
 		return;
 	}
 
-	result = ima_store_template(entry, violation, inode, filename, pcr);
+	result = ima_store_template(ns, entry, violation, inode, filename, pcr);
 	if ((!result || result == -EEXIST) && !(file->f_flags & O_DIRECT)) {
 		iint->flags |= IMA_MEASURED;
 		iint->measured_pcrs |= (0x1 << pcr);
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 25f85c58ebef..e37c973a94c6 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -53,7 +53,9 @@ static ssize_t ima_show_htable_violations(struct file *filp,
 					  char __user *buf,
 					  size_t count, loff_t *ppos)
 {
-	return ima_show_htable_value(buf, count, ppos, &ima_htable.violations);
+	struct ima_namespace *ns = get_current_ns();
+
+	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.violations);
 }
 
 static const struct file_operations ima_htable_violations_ops = {
@@ -65,8 +67,9 @@ static ssize_t ima_show_measurements_count(struct file *filp,
 					   char __user *buf,
 					   size_t count, loff_t *ppos)
 {
-	return ima_show_htable_value(buf, count, ppos, &ima_htable.len);
+	struct ima_namespace *ns = get_current_ns();
 
+	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len);
 }
 
 static const struct file_operations ima_measurements_count_ops = {
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index d78f8faf6dcd..8e0ae3a4f04a 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -39,7 +39,7 @@ struct tpm_chip *ima_tpm_chip;
  * a different value.) Violations add a zero entry to the measurement
  * list and extend the aggregate PCR value with ff...ff's.
  */
-static int __init ima_add_boot_aggregate(void)
+static int __init ima_add_boot_aggregate(struct ima_namespace *ns)
 {
 	static const char op[] = "add_boot_aggregate";
 	const char *audit_cause = "ENOMEM";
@@ -86,7 +86,7 @@ static int __init ima_add_boot_aggregate(void)
 		goto err_out;
 	}
 
-	result = ima_store_template(entry, violation, NULL,
+	result = ima_store_template(ns, entry, violation, NULL,
 				    boot_aggregate_name,
 				    CONFIG_IMA_MEASURE_PCR_IDX);
 	if (result < 0) {
@@ -145,7 +145,7 @@ int __init ima_init(void)
 	rc = ima_init_digests();
 	if (rc != 0)
 		return rc;
-	rc = ima_add_boot_aggregate();	/* boot aggregate must be first entry */
+	rc = ima_add_boot_aggregate(&init_ima_ns);	/* boot aggregate must be first entry */
 	if (rc != 0)
 		return rc;
 
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index db7de6811fcc..02aa7db4c617 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -40,6 +40,10 @@ int ima_init_namespace(struct ima_namespace *ns)
 	ns->ima_rules = (struct list_head __rcu *)(&ns->ima_default_rules);
 	ns->ima_policy_flag = 0;
 
+	atomic_long_set(&ns->ima_htable.len, 0);
+	atomic_long_set(&ns->ima_htable.violations, 0);
+	memset(&ns->ima_htable.queue, 0, sizeof(ns->ima_htable.queue));
+
 	return 0;
 }
 
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index f799cc278a9a..f3ef8a0df992 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -146,7 +146,8 @@ void ima_load_kexec_buffer(void)
 	rc = ima_get_kexec_buffer(&kexec_buffer, &kexec_buffer_size);
 	switch (rc) {
 	case 0:
-		rc = ima_restore_measurement_list(kexec_buffer_size,
+		rc = ima_restore_measurement_list(&init_ima_ns,
+						  kexec_buffer_size,
 						  kexec_buffer);
 		if (rc != 0)
 			pr_err("Failed to restore the measurement list: %d\n",
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 897304046ba4..2121a831f38a 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -112,7 +112,8 @@ static int mmap_violation_check(enum ima_hooks func, struct file *file,
  *	  could result in a file measurement error.
  *
  */
-static void ima_rdwr_violation_check(struct file *file,
+static void ima_rdwr_violation_check(struct ima_namespace *ns,
+				     struct file *file,
 				     struct integrity_iint_cache *iint,
 				     int must_measure,
 				     char **pathbuf,
@@ -145,10 +146,10 @@ static void ima_rdwr_violation_check(struct file *file,
 	*pathname = ima_d_path(&file->f_path, pathbuf, filename);
 
 	if (send_tomtou)
-		ima_add_violation(file, *pathname, iint,
+		ima_add_violation(ns, file, *pathname, iint,
 				  "invalid_pcr", "ToMToU");
 	if (send_writers)
-		ima_add_violation(file, *pathname, iint,
+		ima_add_violation(ns, file, *pathname, iint,
 				  "invalid_pcr", "open_writers");
 }
 
@@ -257,7 +258,7 @@ static int process_measurement(struct ima_namespace *ns,
 	}
 
 	if (!rc && violation_check)
-		ima_rdwr_violation_check(file, iint, action & IMA_MEASURE,
+		ima_rdwr_violation_check(ns, file, iint, action & IMA_MEASURE,
 					 &pathbuf, &pathname, filename);
 
 	inode_unlock(inode);
@@ -354,7 +355,7 @@ static int process_measurement(struct ima_namespace *ns,
 		pathname = ima_d_path(&file->f_path, &pathbuf, filename);
 
 	if (action & IMA_MEASURE)
-		ima_store_measurement(iint, file, pathname,
+		ima_store_measurement(ns, iint, file, pathname,
 				      xattr_value, xattr_len, modsig, pcr,
 				      template_desc);
 	if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) {
@@ -978,7 +979,7 @@ int process_buffer_measurement(struct ima_namespace *ns,
 		goto out;
 	}
 
-	ret = ima_store_template(entry, violation, NULL, event_data.buf, pcr);
+	ret = ima_store_template(ns, entry, violation, NULL, event_data.buf, pcr);
 	if (ret < 0) {
 		audit_cause = "store_entry";
 		ima_free_template_entry(entry);
diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c
index 532da87ce519..373154039b91 100644
--- a/security/integrity/ima/ima_queue.c
+++ b/security/integrity/ima/ima_queue.c
@@ -17,6 +17,7 @@
 
 #include <linux/rculist.h>
 #include <linux/slab.h>
+#include <linux/ima.h>
 #include "ima.h"
 
 #define AUDIT_CAUSE_LEN_MAX 32
@@ -31,21 +32,22 @@ static unsigned long binary_runtime_size;
 static unsigned long binary_runtime_size = ULONG_MAX;
 #endif
 
-/* key: inode (before secure-hashing a file) */
-struct ima_h_table ima_htable = {
-	.len = ATOMIC_LONG_INIT(0),
-	.violations = ATOMIC_LONG_INIT(0),
-	.queue[0 ... IMA_MEASURE_HTABLE_SIZE - 1] = HLIST_HEAD_INIT
-};
-
 /* mutex protects atomicity of extending measurement list
  * and extending the TPM PCR aggregate. Since tpm_extend can take
  * long (and the tpm driver uses a mutex), we can't use the spinlock.
  */
 static DEFINE_MUTEX(ima_extend_list_mutex);
 
+
+static inline unsigned int ima_hash_key(u8 *digest)
+{
+	/* there is no point in taking a hash of part of a digest */
+	return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE;
+}
+
 /* lookup up the digest value in the hash table, and return the entry */
-static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value,
+static struct ima_queue_entry *ima_lookup_digest_entry(struct ima_namespace *ns,
+						       u8 *digest_value,
 						       int pcr)
 {
 	struct ima_queue_entry *qe, *ret = NULL;
@@ -54,7 +56,7 @@ static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value,
 
 	key = ima_hash_key(digest_value);
 	rcu_read_lock();
-	hlist_for_each_entry_rcu(qe, &ima_htable.queue[key], hnext) {
+	hlist_for_each_entry_rcu(qe, &ns->ima_htable.queue[key], hnext) {
 		rc = memcmp(qe->entry->digests[ima_hash_algo_idx].digest,
 			    digest_value, hash_digest_size[ima_hash_algo]);
 		if ((rc == 0) && (qe->entry->pcr == pcr)) {
@@ -90,7 +92,8 @@ static int get_binary_runtime_size(struct ima_template_entry *entry)
  *
  * (Called with ima_extend_list_mutex held.)
  */
-static int ima_add_digest_entry(struct ima_template_entry *entry,
+static int ima_add_digest_entry(struct ima_namespace *ns,
+				struct ima_template_entry *entry,
 				bool update_htable)
 {
 	struct ima_queue_entry *qe;
@@ -106,11 +109,12 @@ static int ima_add_digest_entry(struct ima_template_entry *entry,
 	INIT_LIST_HEAD(&qe->later);
 	list_add_tail_rcu(&qe->later, &ima_measurements);
 
-	atomic_long_inc(&ima_htable.len);
+	atomic_long_inc(&ns->ima_htable.len);
 	if (update_htable) {
 		key = ima_hash_key(entry->digests[ima_hash_algo_idx].digest);
-		hlist_add_head_rcu(&qe->hnext, &ima_htable.queue[key]);
-	}
+		hlist_add_head_rcu(&qe->hnext, &ns->ima_htable.queue[key]);
+	} else
+		INIT_HLIST_NODE(&qe->hnext);
 
 	if (binary_runtime_size != ULONG_MAX) {
 		int size;
@@ -156,7 +160,8 @@ static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr)
  * kexec, maintain the total memory size required for serializing the
  * binary_runtime_measurements.
  */
-int ima_add_template_entry(struct ima_template_entry *entry, int violation,
+int ima_add_template_entry(struct ima_namespace *ns,
+			   struct ima_template_entry *entry, int violation,
 			   const char *op, struct inode *inode,
 			   const unsigned char *filename)
 {
@@ -169,14 +174,14 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
 
 	mutex_lock(&ima_extend_list_mutex);
 	if (!violation && !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE)) {
-		if (ima_lookup_digest_entry(digest, entry->pcr)) {
+		if (ima_lookup_digest_entry(ns, digest, entry->pcr)) {
 			audit_cause = "hash_exists";
 			result = -EEXIST;
 			goto out;
 		}
 	}
 
-	result = ima_add_digest_entry(entry,
+	result = ima_add_digest_entry(ns, entry,
 				      !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE));
 	if (result < 0) {
 		audit_cause = "ENOMEM";
@@ -201,12 +206,13 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
 	return result;
 }
 
-int ima_restore_measurement_entry(struct ima_template_entry *entry)
+int ima_restore_measurement_entry(struct ima_namespace *ns,
+				  struct ima_template_entry *entry)
 {
 	int result = 0;
 
 	mutex_lock(&ima_extend_list_mutex);
-	result = ima_add_digest_entry(entry, 0);
+	result = ima_add_digest_entry(ns, entry, 0);
 	mutex_unlock(&ima_extend_list_mutex);
 	return result;
 }
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 694560396be0..2ae87eb23a59 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -400,7 +400,7 @@ static int ima_restore_template_data(struct ima_template_desc *template_desc,
 }
 
 /* Restore the serialized binary measurement list without extending PCRs. */
-int ima_restore_measurement_list(loff_t size, void *buf)
+int ima_restore_measurement_list(struct ima_namespace *ns, loff_t size, void *buf)
 {
 	char template_name[MAX_TEMPLATE_NAME_LEN];
 	unsigned char zero[TPM_DIGEST_SIZE] = { 0 };
@@ -516,7 +516,7 @@ int ima_restore_measurement_list(loff_t size, void *buf)
 
 		entry->pcr = !ima_canonical_fmt ? *(u32 *)(hdr[HDR_PCR].data) :
 			     le32_to_cpu(*(__le32 *)(hdr[HDR_PCR].data));
-		ret = ima_restore_measurement_entry(entry);
+		ret = ima_restore_measurement_entry(ns, entry);
 		if (ret < 0)
 			break;
 
-- 
2.31.1

[PATCH v6 08/17] ima: Move measurement list related variables into ima_namespace

[Stefan Berger]

Move measurement list related variables into the ima_namespace. This way a
front-end like SecurityFS can show the measurement list inside an IMA
namespace.

Implement ima_free_measurements() to free a list of measurements
and call it when an IMA namespace is deleted.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                      |  2 ++
 security/integrity/ima/ima.h             |  4 +--
 security/integrity/ima/ima_fs.c          |  6 +++--
 security/integrity/ima/ima_init_ima_ns.c |  5 ++++
 security/integrity/ima/ima_kexec.c       | 12 +++++----
 security/integrity/ima/ima_ns.c          |  1 +
 security/integrity/ima/ima_queue.c       | 33 ++++++++++++++----------
 7 files changed, 40 insertions(+), 23 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 65d28fa060c2..85903f40acfd 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -257,6 +257,8 @@ struct ima_namespace {
 	int ima_policy_flag;
 
 	struct ima_h_table ima_htable;
+	struct list_head ima_measurements;
+	unsigned long binary_runtime_size;
 };
 
 extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index a7e6c8fb152a..bb9763cd5fb1 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -104,7 +104,6 @@ struct ima_queue_entry {
 	struct list_head later;		/* place in ima_measurements list */
 	struct ima_template_entry *entry;
 };
-extern struct list_head ima_measurements;	/* list of all measurements */
 
 /* Some details preceding the binary serialized measurement list */
 struct ima_kexec_hdr {
@@ -168,8 +167,9 @@ int ima_restore_measurement_entry(struct ima_namespace *ns,
 				  struct ima_template_entry *entry);
 int ima_restore_measurement_list(struct ima_namespace *ns,
 				 loff_t bufsize, void *buf);
+void ima_free_measurements(struct ima_namespace *ns);
 int ima_measurements_show(struct seq_file *m, void *v);
-unsigned long ima_get_binary_runtime_size(void);
+unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns);
 int ima_init_template(void);
 void ima_init_template_list(void);
 int __init ima_init_digests(void);
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index e37c973a94c6..38b1c26479b3 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -80,12 +80,13 @@ static const struct file_operations ima_measurements_count_ops = {
 /* returns pointer to hlist_node */
 static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
 {
+	struct ima_namespace *ns = get_current_ns();
 	loff_t l = *pos;
 	struct ima_queue_entry *qe;
 
 	/* we need a lock since pos could point beyond last element */
 	rcu_read_lock();
-	list_for_each_entry_rcu(qe, &ima_measurements, later) {
+	list_for_each_entry_rcu(qe, &ns->ima_measurements, later) {
 		if (!l--) {
 			rcu_read_unlock();
 			return qe;
@@ -97,6 +98,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
 
 static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
 {
+	struct ima_namespace *ns = get_current_ns();
 	struct ima_queue_entry *qe = v;
 
 	/* lock protects when reading beyond last element
@@ -107,7 +109,7 @@ static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
 	rcu_read_unlock();
 	(*pos)++;
 
-	return (&qe->later == &ima_measurements) ? NULL : qe;
+	return (&qe->later == &ns->ima_measurements) ? NULL : qe;
 }
 
 static void ima_measurements_stop(struct seq_file *m, void *v)
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index 02aa7db4c617..3bec9a2a0bd9 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -43,6 +43,11 @@ int ima_init_namespace(struct ima_namespace *ns)
 	atomic_long_set(&ns->ima_htable.len, 0);
 	atomic_long_set(&ns->ima_htable.violations, 0);
 	memset(&ns->ima_htable.queue, 0, sizeof(ns->ima_htable.queue));
+	INIT_LIST_HEAD(&ns->ima_measurements);
+	if (IS_ENABLED(CONFIG_IMA_KEXEC) && ns == &init_ima_ns)
+		ns->binary_runtime_size = 0;
+	else
+		ns->binary_runtime_size = ULONG_MAX;
 
 	return 0;
 }
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index f3ef8a0df992..c07149228013 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -15,7 +15,8 @@
 #include "ima.h"
 
 #ifdef CONFIG_IMA_KEXEC
-static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
+static int ima_dump_measurement_list(struct ima_namespace *ns,
+				    unsigned long *buffer_size, void **buffer,
 				     unsigned long segment_size)
 {
 	struct ima_queue_entry *qe;
@@ -36,7 +37,7 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
 
 	memset(&khdr, 0, sizeof(khdr));
 	khdr.version = 1;
-	list_for_each_entry_rcu(qe, &ima_measurements, later) {
+	list_for_each_entry_rcu(qe, &ns->ima_measurements, later) {
 		if (file.count < file.size) {
 			khdr.count++;
 			ima_measurements_show(&file, qe);
@@ -84,6 +85,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 	struct kexec_buf kbuf = { .image = image, .buf_align = PAGE_SIZE,
 				  .buf_min = 0, .buf_max = ULONG_MAX,
 				  .top_down = true };
+	struct ima_namespace *ns = &init_ima_ns;
 	unsigned long binary_runtime_size;
 
 	/* use more understandable variable names than defined in kbuf */
@@ -96,11 +98,11 @@ void ima_add_kexec_buffer(struct kimage *image)
 	 * Reserve an extra half page of memory for additional measurements
 	 * added during the kexec load.
 	 */
-	binary_runtime_size = ima_get_binary_runtime_size();
+	binary_runtime_size = ima_get_binary_runtime_size(ns);
 	if (binary_runtime_size >= ULONG_MAX - PAGE_SIZE)
 		kexec_segment_size = ULONG_MAX;
 	else
-		kexec_segment_size = ALIGN(ima_get_binary_runtime_size() +
+		kexec_segment_size = ALIGN(ima_get_binary_runtime_size(ns) +
 					   PAGE_SIZE / 2, PAGE_SIZE);
 	if ((kexec_segment_size == ULONG_MAX) ||
 	    ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) {
@@ -108,7 +110,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ima_dump_measurement_list(&kexec_buffer_size, &kexec_buffer,
+	ima_dump_measurement_list(ns, &kexec_buffer_size, &kexec_buffer,
 				  kexec_segment_size);
 	if (!kexec_buffer) {
 		pr_err("Not enough memory for the kexec measurement buffer.\n");
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index 9d97f45fa8e4..97596282e7bc 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -56,6 +56,7 @@ static void destroy_ima_ns(struct ima_namespace *ns)
 	pr_debug("DESTROY ima_ns: 0x%p\n", ns);
 	ima_free_policy_rules(ns);
 	free_ns_status_cache(ns);
+	ima_free_measurements(ns);
 	kmem_cache_free(imans_cachep, ns);
 }
 
diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c
index 373154039b91..f15f776918ec 100644
--- a/security/integrity/ima/ima_queue.c
+++ b/security/integrity/ima/ima_queue.c
@@ -25,13 +25,6 @@
 /* pre-allocated array of tpm_digest structures to extend a PCR */
 static struct tpm_digest *digests;
 
-LIST_HEAD(ima_measurements);	/* list of all measurements */
-#ifdef CONFIG_IMA_KEXEC
-static unsigned long binary_runtime_size;
-#else
-static unsigned long binary_runtime_size = ULONG_MAX;
-#endif
-
 /* mutex protects atomicity of extending measurement list
  * and extending the TPM PCR aggregate. Since tpm_extend can take
  * long (and the tpm driver uses a mutex), we can't use the spinlock.
@@ -107,7 +100,7 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
 	qe->entry = entry;
 
 	INIT_LIST_HEAD(&qe->later);
-	list_add_tail_rcu(&qe->later, &ima_measurements);
+	list_add_tail_rcu(&qe->later, &ns->ima_measurements);
 
 	atomic_long_inc(&ns->ima_htable.len);
 	if (update_htable) {
@@ -116,12 +109,12 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
 	} else
 		INIT_HLIST_NODE(&qe->hnext);
 
-	if (binary_runtime_size != ULONG_MAX) {
+	if (ns->binary_runtime_size != ULONG_MAX) {
 		int size;
 
 		size = get_binary_runtime_size(entry);
-		binary_runtime_size = (binary_runtime_size < ULONG_MAX - size) ?
-		     binary_runtime_size + size : ULONG_MAX;
+		ns->binary_runtime_size = (ns->binary_runtime_size < ULONG_MAX - size) ?
+		     ns->binary_runtime_size + size : ULONG_MAX;
 	}
 	return 0;
 }
@@ -131,12 +124,12 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
  * entire binary_runtime_measurement list, including the ima_kexec_hdr
  * structure.
  */
-unsigned long ima_get_binary_runtime_size(void)
+unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns)
 {
-	if (binary_runtime_size >= (ULONG_MAX - sizeof(struct ima_kexec_hdr)))
+	if (ns->binary_runtime_size >= (ULONG_MAX - sizeof(struct ima_kexec_hdr)))
 		return ULONG_MAX;
 	else
-		return binary_runtime_size + sizeof(struct ima_kexec_hdr);
+		return ns->binary_runtime_size + sizeof(struct ima_kexec_hdr);
 }
 
 static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr)
@@ -217,6 +210,18 @@ int ima_restore_measurement_entry(struct ima_namespace *ns,
 	return result;
 }
 
+void ima_free_measurements(struct ima_namespace *ns)
+{
+	struct ima_queue_entry *qe, *tmp;
+
+	list_for_each_entry_safe(qe, tmp, &ns->ima_measurements, later) {
+		list_del(&qe->later);
+		if (!hlist_unhashed(&qe->hnext))
+			hlist_del(&qe->hnext);
+		kfree(qe);
+	}
+}
+
 int __init ima_init_digests(void)
 {
 	u16 digest_size;
-- 
2.31.1

[PATCH v6 09/17] ima: Only accept AUDIT rules for IMA non-init_ima_ns namespaces for now

[Stefan Berger]

Only accept AUDIT rules for non-init_ima_ns namespaces rejecting all rules
that require support for measuring, appraisal, and hashing.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 security/integrity/ima/ima_policy.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 4d6d3a39f65e..747dca6131d6 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1787,6 +1787,16 @@ static int ima_parse_rule(struct ima_namespace *ns,
 			result = -EINVAL;
 			break;
 		}
+
+		/* IMA namespace only accepts AUDIT rules */
+		if (ns != &init_ima_ns) {
+			switch (entry->action) {
+			case MEASURE:
+			case APPRAISE:
+			case HASH:
+				result = -EINVAL;
+			}
+		}
 	}
 	if (!result && !ima_validate_rule(entry))
 		result = -EINVAL;
-- 
2.31.1

[PATCH v6 10/17] ima: Implement hierarchical processing of file accesses

[Stefan Berger]

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 | 29 +++++++++++++++++++++++++----
 2 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 85903f40acfd..fda371cbde50 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 2121a831f38a..6ebc57cd91d3 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 +405,27 @@ 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

[PATCH v6 11/17] securityfs: Only use simple_pin_fs/simple_release_fs for init_user_ns

[Stefan Berger]

To prepare for virtualization of SecurityFS, use simple_pin_fs and
simpe_release_fs only when init_user_ns is active.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 security/inode.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/security/inode.c b/security/inode.c
index 6c326939750d..fee01ff4d831 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -21,9 +21,10 @@
 #include <linux/security.h>
 #include <linux/lsm_hooks.h>
 #include <linux/magic.h>
+#include <linux/user_namespace.h>
 
-static struct vfsmount *mount;
-static int mount_count;
+static struct vfsmount *init_securityfs_mount;
+static int init_securityfs_mount_count;
 
 static void securityfs_free_inode(struct inode *inode)
 {
@@ -109,6 +110,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 					const struct file_operations *fops,
 					const struct inode_operations *iops)
 {
+	struct user_namespace *ns = current_user_ns();
 	struct dentry *dentry;
 	struct inode *dir, *inode;
 	int error;
@@ -118,12 +120,19 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 
 	pr_debug("securityfs: creating file '%s'\n",name);
 
-	error = simple_pin_fs(&fs_type, &mount, &mount_count);
-	if (error)
-		return ERR_PTR(error);
+	if (ns == &init_user_ns) {
+		error = simple_pin_fs(&fs_type, &init_securityfs_mount,
+				      &init_securityfs_mount_count);
+		if (error)
+			return ERR_PTR(error);
+	}
 
-	if (!parent)
-		parent = mount->mnt_root;
+	if (!parent) {
+		if (ns == &init_user_ns)
+			parent = init_securityfs_mount->mnt_root;
+		else
+			return ERR_PTR(-EINVAL);
+	}
 
 	dir = d_inode(parent);
 
@@ -168,7 +177,9 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 	dentry = ERR_PTR(error);
 out:
 	inode_unlock(dir);
-	simple_release_fs(&mount, &mount_count);
+	if (ns == &init_user_ns)
+		simple_release_fs(&init_securityfs_mount,
+				  &init_securityfs_mount_count);
 	return dentry;
 }
 
@@ -294,11 +305,14 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink);
  */
 void securityfs_remove(struct dentry *dentry)
 {
+	struct user_namespace *ns;
 	struct inode *dir;
 
 	if (!dentry || IS_ERR(dentry))
 		return;
 
+	ns = dentry->d_sb->s_user_ns;
+
 	dir = d_inode(dentry->d_parent);
 	inode_lock(dir);
 	if (simple_positive(dentry)) {
@@ -309,7 +323,9 @@ void securityfs_remove(struct dentry *dentry)
 		dput(dentry);
 	}
 	inode_unlock(dir);
-	simple_release_fs(&mount, &mount_count);
+	if (ns == &init_user_ns)
+		simple_release_fs(&init_securityfs_mount,
+				  &init_securityfs_mount_count);
 }
 EXPORT_SYMBOL_GPL(securityfs_remove);
 
-- 
2.31.1

[PATCH v6 12/17] securityfs: Extend securityfs with namespacing support

[Stefan Berger]

Extend 'securityfs' for support of IMA namespacing so that each
IMA (user) namespace can have its own front-end for showing the currently
active policy, the measurement list, number of violations and so on.

Drop the addition dentry reference and simplify cleanup to work without
the additional reference. This enables simple cleanup of dentries upon
umount.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
 security/inode.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/security/inode.c b/security/inode.c
index fee01ff4d831..c77ae8ecc464 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -54,7 +54,7 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 static int securityfs_get_tree(struct fs_context *fc)
 {
-	return get_tree_single(fc, securityfs_fill_super);
+	return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns);
 }
 
 static const struct fs_context_operations securityfs_context_ops = {
@@ -72,6 +72,7 @@ static struct file_system_type fs_type = {
 	.name =		"securityfs",
 	.init_fs_context = securityfs_init_fs_context,
 	.kill_sb =	kill_litter_super,
+	.fs_flags =	FS_USERNS_MOUNT,
 };
 
 /**
@@ -168,7 +169,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 		inode->i_fop = fops;
 	}
 	d_instantiate(dentry, inode);
-	dget(dentry);
 	inode_unlock(dir);
 	return dentry;
 
@@ -306,23 +306,17 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink);
 void securityfs_remove(struct dentry *dentry)
 {
 	struct user_namespace *ns;
-	struct inode *dir;
 
 	if (!dentry || IS_ERR(dentry))
 		return;
 
 	ns = dentry->d_sb->s_user_ns;
 
-	dir = d_inode(dentry->d_parent);
-	inode_lock(dir);
 	if (simple_positive(dentry)) {
-		if (d_is_dir(dentry))
-			simple_rmdir(dir, dentry);
-		else
-			simple_unlink(dir, dentry);
+		d_delete(dentry);
 		dput(dentry);
 	}
-	inode_unlock(dir);
+
 	if (ns == &init_user_ns)
 		simple_release_fs(&init_securityfs_mount,
 				  &init_securityfs_mount_count);
-- 
2.31.1

[PATCH v6 13/17] ima: Move some IMA policy and filesystem related variables into ima_namespace

[Stefan Berger]

Move the ima_write_mutex, ima_fs_flag, and valid_policy variables into
ima_namespace. This way each IMA namespace can set those variables
independently.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/ima.h                      |  5 ++++
 security/integrity/ima/ima_fs.c          | 32 +++++++++++-------------
 security/integrity/ima/ima_init_ima_ns.c |  4 +++
 3 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index fda371cbde50..ca300306a715 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -268,6 +268,11 @@ struct ima_namespace {
 	struct ima_h_table ima_htable;
 	struct list_head ima_measurements;
 	unsigned long binary_runtime_size;
+
+	/* IMA's filesystem */
+	struct mutex ima_write_mutex;
+	unsigned long ima_fs_flags;
+	int valid_policy;
 };
 
 extern struct ima_namespace init_ima_ns;
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 38b1c26479b3..0e582ceecc7f 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -25,8 +25,6 @@
 
 #include "ima.h"
 
-static DEFINE_MUTEX(ima_write_mutex);
-
 bool ima_canonical_fmt;
 static int __init default_canonical_fmt_setup(char *str)
 {
@@ -37,8 +35,6 @@ static int __init default_canonical_fmt_setup(char *str)
 }
 __setup("ima_canonical_fmt", default_canonical_fmt_setup);
 
-static int valid_policy = 1;
-
 static ssize_t ima_show_htable_value(char __user *buf, size_t count,
 				     loff_t *ppos, atomic_long_t *val)
 {
@@ -339,7 +335,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 		goto out;
 	}
 
-	result = mutex_lock_interruptible(&ima_write_mutex);
+	result = mutex_lock_interruptible(&ns->ima_write_mutex);
 	if (result < 0)
 		goto out_free;
 
@@ -354,12 +350,12 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 	} else {
 		result = ima_parse_add_rule(ns, data);
 	}
-	mutex_unlock(&ima_write_mutex);
+	mutex_unlock(&ns->ima_write_mutex);
 out_free:
 	kfree(data);
 out:
 	if (result < 0)
-		valid_policy = 0;
+		ns->valid_policy = 0;
 
 	return result;
 }
@@ -376,8 +372,6 @@ enum ima_fs_flags {
 	IMA_FS_BUSY,
 };
 
-static unsigned long ima_fs_flags;
-
 #ifdef	CONFIG_IMA_READ_POLICY
 static const struct seq_operations ima_policy_seqops = {
 		.start = ima_policy_start,
@@ -392,6 +386,8 @@ static const struct seq_operations ima_policy_seqops = {
  */
 static int ima_open_policy(struct inode *inode, struct file *filp)
 {
+	struct ima_namespace *ns = get_current_ns();
+
 	if (!(filp->f_flags & O_WRONLY)) {
 #ifndef	CONFIG_IMA_READ_POLICY
 		return -EACCES;
@@ -403,7 +399,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
 		return seq_open(filp, &ima_policy_seqops);
 #endif
 	}
-	if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags))
+	if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags))
 		return -EBUSY;
 	return 0;
 }
@@ -417,25 +413,25 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
  */
 static int ima_release_policy(struct inode *inode, struct file *file)
 {
-	const char *cause = valid_policy ? "completed" : "failed";
 	struct ima_namespace *ns = get_current_ns();
+	const char *cause = ns->valid_policy ? "completed" : "failed";
 
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 		return seq_release(inode, file);
 
-	if (valid_policy && ima_check_policy(ns) < 0) {
+	if (ns->valid_policy && ima_check_policy(ns) < 0) {
 		cause = "failed";
-		valid_policy = 0;
+		ns->valid_policy = 0;
 	}
 
 	pr_info("policy update %s\n", cause);
 	integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
-			    "policy_update", cause, !valid_policy, 0);
+			    "policy_update", cause, !ns->valid_policy, 0);
 
-	if (!valid_policy) {
+	if (!ns->valid_policy) {
 		ima_delete_rules(ns);
-		valid_policy = 1;
-		clear_bit(IMA_FS_BUSY, &ima_fs_flags);
+		ns->valid_policy = 1;
+		clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
 		return 0;
 	}
 
@@ -444,7 +440,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 	securityfs_remove(ima_policy);
 	ima_policy = NULL;
 #elif defined(CONFIG_IMA_WRITE_POLICY)
-	clear_bit(IMA_FS_BUSY, &ima_fs_flags);
+	clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
 #elif defined(CONFIG_IMA_READ_POLICY)
 	inode->i_mode &= ~S_IWUSR;
 #endif
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index 3bec9a2a0bd9..02cefc657c88 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -49,6 +49,10 @@ int ima_init_namespace(struct ima_namespace *ns)
 	else
 		ns->binary_runtime_size = ULONG_MAX;
 
+	mutex_init(&ns->ima_write_mutex);
+	ns->valid_policy = 1;
+	ns->ima_fs_flags = 0;
+
 	return 0;
 }
 
-- 
2.31.1

[PATCH v6 14/17] ima: Tie opened SecurityFS files to the IMA namespace it belongs to

[Stefan Berger]

Tie IMA's files in SecurityFS to the IMA namespace they belong to so that
also file descriptor that were passed or inherited to other user/IMA
namespaces will always access the data of the IMA namespace they originally
belonged to.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 security/integrity/ima/ima_fs.c     | 74 ++++++++++++++++++++++++-----
 security/integrity/ima/ima_policy.c |  4 +-
 2 files changed, 63 insertions(+), 15 deletions(-)

diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 0e582ceecc7f..a136d14f29ec 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -35,6 +35,20 @@ static int __init default_canonical_fmt_setup(char *str)
 }
 __setup("ima_canonical_fmt", default_canonical_fmt_setup);
 
+static inline struct user_namespace *ima_user_ns_from_file(struct file *filp)
+{
+	return filp->f_path.mnt->mnt_sb->s_user_ns;
+}
+
+static int ima_open(struct inode *inode, struct file *file)
+{
+	struct user_namespace *user_ns = ima_user_ns_from_file(file);
+	struct ima_namespace *ns = user_ns->ima_ns;
+
+	file->private_data = ns;
+	return 0;
+}
+
 static ssize_t ima_show_htable_value(char __user *buf, size_t count,
 				     loff_t *ppos, atomic_long_t *val)
 {
@@ -49,12 +63,13 @@ static ssize_t ima_show_htable_violations(struct file *filp,
 					  char __user *buf,
 					  size_t count, loff_t *ppos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = filp->private_data;
 
 	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.violations);
 }
 
 static const struct file_operations ima_htable_violations_ops = {
+	.open = ima_open,
 	.read = ima_show_htable_violations,
 	.llseek = generic_file_llseek,
 };
@@ -63,12 +78,13 @@ static ssize_t ima_show_measurements_count(struct file *filp,
 					   char __user *buf,
 					   size_t count, loff_t *ppos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = filp->private_data;
 
 	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len);
 }
 
 static const struct file_operations ima_measurements_count_ops = {
+	.open = ima_open,
 	.read = ima_show_measurements_count,
 	.llseek = generic_file_llseek,
 };
@@ -76,7 +92,7 @@ static const struct file_operations ima_measurements_count_ops = {
 /* returns pointer to hlist_node */
 static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = m->private;
 	loff_t l = *pos;
 	struct ima_queue_entry *qe;
 
@@ -94,7 +110,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
 
 static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = m->private;
 	struct ima_queue_entry *qe = v;
 
 	/* lock protects when reading beyond last element
@@ -195,9 +211,26 @@ static const struct seq_operations ima_measurments_seqops = {
 	.show = ima_measurements_show
 };
 
+static int ima_seq_open(struct file *file, const struct seq_operations *seq_ops)
+{
+	struct user_namespace *user_ns = ima_user_ns_from_file(file);
+	struct ima_namespace *ns = user_ns->ima_ns;
+	struct seq_file *seq;
+	int err;
+
+	err = seq_open(file, seq_ops);
+	if (err)
+		return err;
+
+	seq = file->private_data;
+	seq->private = ns;
+
+	return 0;
+}
+
 static int ima_measurements_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &ima_measurments_seqops);
+	return ima_seq_open(file, &ima_measurments_seqops);
 }
 
 static const struct file_operations ima_measurements_ops = {
@@ -263,7 +296,7 @@ static const struct seq_operations ima_ascii_measurements_seqops = {
 
 static int ima_ascii_measurements_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &ima_ascii_measurements_seqops);
+	return ima_seq_open(file, &ima_ascii_measurements_seqops);
 }
 
 static const struct file_operations ima_ascii_measurements_ops = {
@@ -273,9 +306,8 @@ static const struct file_operations ima_ascii_measurements_ops = {
 	.release = seq_release,
 };
 
-static ssize_t ima_read_policy(char *path)
+static ssize_t ima_read_policy(struct ima_namespace *ns, char *path)
 {
-	struct ima_namespace *ns = get_current_ns();
 	void *data = NULL;
 	char *datap;
 	size_t size;
@@ -314,10 +346,23 @@ static ssize_t ima_read_policy(char *path)
 		return pathlen;
 }
 
+static struct ima_namespace *ima_filp_private(struct file *filp)
+{
+	if (!(filp->f_flags & O_WRONLY)) {
+#ifdef CONFIG_IMA_READ_POLICY
+		struct seq_file *seq;
+
+		seq = filp->private_data;
+		return seq->private;
+#endif
+	}
+	return filp->private_data;
+}
+
 static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 				size_t datalen, loff_t *ppos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = ima_filp_private(file);
 	char *data;
 	ssize_t result;
 
@@ -340,7 +385,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 		goto out_free;
 
 	if (data[0] == '/') {
-		result = ima_read_policy(data);
+		result = ima_read_policy(ns, data);
 	} else if (ima_appraise & IMA_APPRAISE_POLICY) {
 		pr_err("signed policy file (specified as an absolute pathname) required\n");
 		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
@@ -386,7 +431,8 @@ static const struct seq_operations ima_policy_seqops = {
  */
 static int ima_open_policy(struct inode *inode, struct file *filp)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct user_namespace *user_ns = ima_user_ns_from_file(filp);
+	struct ima_namespace *ns = user_ns->ima_ns;
 
 	if (!(filp->f_flags & O_WRONLY)) {
 #ifndef	CONFIG_IMA_READ_POLICY
@@ -396,11 +442,13 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
 			return -EACCES;
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
-		return seq_open(filp, &ima_policy_seqops);
+		return ima_seq_open(filp, &ima_policy_seqops);
 #endif
 	}
 	if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags))
 		return -EBUSY;
+
+	filp->private_data = ns;
 	return 0;
 }
 
@@ -413,7 +461,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
  */
 static int ima_release_policy(struct inode *inode, struct file *file)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = ima_filp_private(file);
 	const char *cause = ns->valid_policy ? "completed" : "failed";
 
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 747dca6131d6..c2acd4cf529d 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1908,7 +1908,7 @@ static const char *const mask_tokens[] = {
 
 void *ima_policy_start(struct seq_file *m, loff_t *pos)
 {
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = m->private;
 	loff_t l = *pos;
 	struct ima_rule_entry *entry;
 	struct list_head *ima_rules_tmp;
@@ -1928,7 +1928,7 @@ void *ima_policy_start(struct seq_file *m, loff_t *pos)
 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct ima_rule_entry *entry = v;
-	struct ima_namespace *ns = get_current_ns();
+	struct ima_namespace *ns = m->private;
 
 	rcu_read_lock();
 	entry = list_entry_rcu(entry->list.next, struct ima_rule_entry, list);
-- 
2.31.1

[PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability

[Stefan Berger]

Use mac_admin_ns_capable() to check corresponding capability to allow
read/write IMA policy without CAP_SYS_ADMIN but with CAP_MAC_ADMIN.

Signed-off-by: Denis Semakin <denis.semakin@huawei.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 include/linux/capability.h      | 6 ++++++
 security/integrity/ima/ima_fs.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/capability.h b/include/linux/capability.h
index 65efb74c3585..991579178f32 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -270,6 +270,12 @@ static inline bool checkpoint_restore_ns_capable(struct user_namespace *ns)
 		ns_capable(ns, CAP_SYS_ADMIN);
 }
 
+static inline bool mac_admin_ns_capable(struct user_namespace *ns)
+{
+	return ns_capable(ns, CAP_MAC_ADMIN) ||
+		ns_capable(ns, CAP_SYS_ADMIN);
+}
+
 /* audit system wants to get cap info from files as well */
 int get_vfs_caps_from_disk(struct user_namespace *mnt_userns,
 			   const struct dentry *dentry,
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index a136d14f29ec..090ee85bfa3a 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -440,7 +440,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
 #else
 		if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
 			return -EACCES;
-		if (!capable(CAP_SYS_ADMIN))
+		if (!mac_admin_ns_capable(user_ns))
 			return -EPERM;
 		return ima_seq_open(filp, &ima_policy_seqops);
 #endif
-- 
2.31.1

[PATCH v6 16/17] ima: Move dentry into ima_namespace and others onto stack

[Stefan Berger]

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 <stefanb@linux.ibm.com>
---
 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);
+}
-- 
2.31.1

[PATCH v6 17/17] ima: Setup securityfs for IMA namespace

[Stefan Berger]

Setup securityfs with symlinks, directories, and files for IMA
namespacing support. The same directory structure that IMA uses on the
host is also created for the namespacing case.

The securityfs file and directory ownerships cannot be set when the
IMA namespace is initialized. Therefore, delay the setup of the file
system to a later point when securityfs is in securityfs_fill_super.

This filesystem can now be mounted as follows:

mount -t securityfs /sys/kernel/security/ /sys/kernel/security/

The following directories, symlinks, and files are then available.

$ ls -l sys/kernel/security/
total 0
lr--r--r--. 1 root root 0 Dec  2 00:18 ima -> integrity/ima
drwxr-xr-x. 3 root root 0 Dec  2 00:18 integrity

$ ls -l sys/kernel/security/ima/
total 0
-r--r-----. 1 root root 0 Dec  2 00:18 ascii_runtime_measurements
-r--r-----. 1 root root 0 Dec  2 00:18 binary_runtime_measurements
-rw-------. 1 root root 0 Dec  2 00:18 policy
-r--r-----. 1 root root 0 Dec  2 00:18 runtime_measurements_count
-r--r-----. 1 root root 0 Dec  2 00:18 violations

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
 include/linux/ima.h             | 15 ++++++++++++-
 security/inode.c                |  7 +++++-
 security/integrity/ima/ima_fs.c | 40 ++++++++++++++++++++++++---------
 3 files changed, 49 insertions(+), 13 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index cc950ccbf157..5524f439d9cf 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -40,6 +40,7 @@ extern int ima_measure_critical_data(const char *event_label,
 				     const char *event_name,
 				     const void *buf, size_t buf_len,
 				     bool hash, u8 *digest, size_t digest_len);
+extern int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root);
 
 #ifdef CONFIG_IMA_APPRAISE_BOOTPARAM
 extern void ima_appraise_parse_cmdline(void);
@@ -275,6 +276,7 @@ struct ima_namespace {
 	int valid_policy;
 
 	struct dentry *policy_dentry;
+	bool policy_dentry_removed;
 };
 
 extern struct ima_namespace init_ima_ns;
@@ -284,12 +286,17 @@ extern struct list_head ima_default_rules;
 
 void free_ima_ns(struct user_namespace *ns);
 int create_ima_ns(struct user_namespace *user_ns);
-
 static inline struct ima_namespace *get_current_ns(void)
 {
 	return current_user_ns()->ima_ns;
 }
 
+static inline int ima_securityfs_init(struct user_namespace *user_ns,
+				      struct dentry *root)
+{
+	return ima_fs_ns_init(user_ns, root);
+}
+
 #else
 
 static inline void free_ima_ns(struct user_namespace *user_ns)
@@ -308,6 +315,12 @@ static inline struct ima_namespace *get_current_ns(void)
 {
 	return &init_ima_ns;
 }
+
+static inline int ima_securityfs_init(struct user_namespace *ns, struct dentry *root)
+{
+	return 0;
+}
+
 #endif /* CONFIG_IMA_NS */
 
 #if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING)
diff --git a/security/inode.c b/security/inode.c
index c77ae8ecc464..c9327389ad80 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -16,6 +16,7 @@
 #include <linux/fs_context.h>
 #include <linux/mount.h>
 #include <linux/pagemap.h>
+#include <linux/ima.h>
 #include <linux/init.h>
 #include <linux/namei.h>
 #include <linux/security.h>
@@ -41,6 +42,7 @@ static const struct super_operations securityfs_super_operations = {
 static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	static const struct tree_descr files[] = {{""}};
+	struct user_namespace *ns = fc->user_ns;
 	int error;
 
 	error = simple_fill_super(sb, SECURITYFS_MAGIC, files);
@@ -49,7 +51,10 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	sb->s_op = &securityfs_super_operations;
 
-	return 0;
+	if (ns != &init_user_ns)
+		error = ima_securityfs_init(ns, sb->s_root);
+
+	return error;
 }
 
 static int securityfs_get_tree(struct fs_context *fc)
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 84b3bf2f1454..f1c3cde25c80 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -479,6 +479,7 @@ static int ima_release_policy(struct inode *inode, struct file *file)
 #if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)
 	securityfs_remove(ns->policy_dentry);
 	ns->policy_dentry = NULL;
+	ns->policy_dentry_removed = true;
 #elif defined(CONFIG_IMA_WRITE_POLICY)
 	clear_bit(IMA_FS_BUSY, &ns->ima_fs_flags);
 #elif defined(CONFIG_IMA_READ_POLICY)
@@ -495,21 +496,31 @@ static const struct file_operations ima_measure_policy_ops = {
 	.llseek = generic_file_llseek,
 };
 
-static int __init ima_fs_ns_init(struct user_namespace *user_ns)
+int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root)
 {
 	struct ima_namespace *ns = user_ns->ima_ns;
-	struct dentry *ima_dir;
+	struct dentry *int_dir;
+	struct dentry *ima_dir = NULL;
 	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);
+	/* FIXME: update when evm and integrity are namespaced */
+	if (user_ns != &init_user_ns) {
+		int_dir =
+			securityfs_create_dir("integrity", root);
+		if (IS_ERR(int_dir))
+			return -1;
+	} else
+		int_dir = integrity_dir;
+
+	ima_dir = securityfs_create_dir("ima", int_dir);
 	if (IS_ERR(ima_dir))
-		return -1;
+		goto out;
 
-	ima_symlink = securityfs_create_symlink("ima", NULL, "integrity/ima",
+	ima_symlink = securityfs_create_symlink("ima", root, "integrity/ima",
 						NULL);
 	if (IS_ERR(ima_symlink))
 		goto out;
@@ -541,11 +552,15 @@ static int __init ima_fs_ns_init(struct user_namespace *user_ns)
 	if (IS_ERR(violations))
 		goto out;
 
-	ns->policy_dentry = securityfs_create_file("policy", POLICY_FILE_FLAGS,
-					    ima_dir, NULL,
-					    &ima_measure_policy_ops);
-	if (IS_ERR(ns->policy_dentry))
-		goto out;
+
+	if (!ns->policy_dentry_removed) {
+		ns->policy_dentry =
+		    securityfs_create_file("policy", POLICY_FILE_FLAGS,
+					   ima_dir, NULL,
+					   &ima_measure_policy_ops);
+		if (IS_ERR(ns->policy_dentry))
+			goto out;
+	}
 
 	return 0;
 out:
@@ -556,10 +571,13 @@ static int __init ima_fs_ns_init(struct user_namespace *user_ns)
 	securityfs_remove(binary_runtime_measurements);
 	securityfs_remove(ima_symlink);
 	securityfs_remove(ima_dir);
+	if (user_ns != &init_user_ns)
+		securityfs_remove(integrity_dir);
+
 	return -1;
 }
 
 int __init ima_fs_init(void)
 {
-	return ima_fs_ns_init(&init_user_ns);
+	return ima_fs_ns_init(&init_user_ns, NULL);
 }
-- 
2.31.1

Re: [PATCH v6 12/17] securityfs: Extend securityfs with namespacing support

[Christian Brauner]

On Fri, Dec 10, 2021 at 02:47:31PM -0500, Stefan Berger wrote:
> Extend 'securityfs' for support of IMA namespacing so that each
> IMA (user) namespace can have its own front-end for showing the currently
> active policy, the measurement list, number of violations and so on.
> 
> Drop the addition dentry reference and simplify cleanup to work without
> the additional reference. This enables simple cleanup of dentries upon
> umount.
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> ---
>  security/inode.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/security/inode.c b/security/inode.c
> index fee01ff4d831..c77ae8ecc464 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -54,7 +54,7 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
>  
>  static int securityfs_get_tree(struct fs_context *fc)
>  {
> -	return get_tree_single(fc, securityfs_fill_super);
> +	return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns);
>  }
>  
>  static const struct fs_context_operations securityfs_context_ops = {
> @@ -72,6 +72,7 @@ static struct file_system_type fs_type = {
>  	.name =		"securityfs",
>  	.init_fs_context = securityfs_init_fs_context,
>  	.kill_sb =	kill_litter_super,
> +	.fs_flags =	FS_USERNS_MOUNT,
>  };
>  
>  /**
> @@ -168,7 +169,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
>  		inode->i_fop = fops;
>  	}
>  	d_instantiate(dentry, inode);
> -	dget(dentry);
>  	inode_unlock(dir);
>  	return dentry;
>  
> @@ -306,23 +306,17 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink);
>  void securityfs_remove(struct dentry *dentry)
>  {
>  	struct user_namespace *ns;
> -	struct inode *dir;
>  
>  	if (!dentry || IS_ERR(dentry))
>  		return;
>  
>  	ns = dentry->d_sb->s_user_ns;
>  
> -	dir = d_inode(dentry->d_parent);
> -	inode_lock(dir);
>  	if (simple_positive(dentry)) {
> -		if (d_is_dir(dentry))
> -			simple_rmdir(dir, dentry);
> -		else
> -			simple_unlink(dir, dentry);
> +		d_delete(dentry);
>  		dput(dentry);

In
https://lore.kernel.org/lkml/20211210114934.tacjnwryihrsx6ln@wittgenstein
I explained why d_delete()+d_put() only is wrong and how to fix it.

Re: [PATCH v6 14/17] ima: Tie opened SecurityFS files to the IMA namespace it belongs to

[Christian Brauner]

On Fri, Dec 10, 2021 at 02:47:33PM -0500, Stefan Berger wrote:
> Tie IMA's files in SecurityFS to the IMA namespace they belong to so that
> also file descriptor that were passed or inherited to other user/IMA
> namespaces will always access the data of the IMA namespace they originally
> belonged to.
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> ---
>  security/integrity/ima/ima_fs.c     | 74 ++++++++++++++++++++++++-----
>  security/integrity/ima/ima_policy.c |  4 +-
>  2 files changed, 63 insertions(+), 15 deletions(-)
> 
> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
> index 0e582ceecc7f..a136d14f29ec 100644
> --- a/security/integrity/ima/ima_fs.c
> +++ b/security/integrity/ima/ima_fs.c
> @@ -35,6 +35,20 @@ static int __init default_canonical_fmt_setup(char *str)
>  }
>  __setup("ima_canonical_fmt", default_canonical_fmt_setup);
>  
> +static inline struct user_namespace *ima_user_ns_from_file(struct file *filp)
> +{
> +	return filp->f_path.mnt->mnt_sb->s_user_ns;
> +}

I'd probably rewrite this as:

static inline struct user_namespace *ima_user_ns_from_file(const struct file *filp)
{
	return file_inode(filp)->i_sb->s_user_ns;
}

as it spares you some pointer chasing and also looks cleaner.

> +
> +static int ima_open(struct inode *inode, struct file *file)
> +{
> +	struct user_namespace *user_ns = ima_user_ns_from_file(file);
> +	struct ima_namespace *ns = user_ns->ima_ns;
> +
> +	file->private_data = ns;
> +	return 0;
> +}
> +
>  static ssize_t ima_show_htable_value(char __user *buf, size_t count,
>  				     loff_t *ppos, atomic_long_t *val)
>  {
> @@ -49,12 +63,13 @@ static ssize_t ima_show_htable_violations(struct file *filp,
>  					  char __user *buf,
>  					  size_t count, loff_t *ppos)
>  {
> -	struct ima_namespace *ns = get_current_ns();
> +	struct ima_namespace *ns = filp->private_data;
>  
>  	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.violations);
>  }
>  
>  static const struct file_operations ima_htable_violations_ops = {
> +	.open = ima_open,
>  	.read = ima_show_htable_violations,
>  	.llseek = generic_file_llseek,
>  };
> @@ -63,12 +78,13 @@ static ssize_t ima_show_measurements_count(struct file *filp,
>  					   char __user *buf,
>  					   size_t count, loff_t *ppos)
>  {
> -	struct ima_namespace *ns = get_current_ns();
> +	struct ima_namespace *ns = filp->private_data;
>  
>  	return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len);
>  }
>  
>  static const struct file_operations ima_measurements_count_ops = {
> +	.open = ima_open,
>  	.read = ima_show_measurements_count,
>  	.llseek = generic_file_llseek,
>  };
> @@ -76,7 +92,7 @@ static const struct file_operations ima_measurements_count_ops = {
>  /* returns pointer to hlist_node */
>  static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
>  {
> -	struct ima_namespace *ns = get_current_ns();
> +	struct ima_namespace *ns = m->private;
>  	loff_t l = *pos;
>  	struct ima_queue_entry *qe;
>  
> @@ -94,7 +110,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
>  
>  static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
>  {
> -	struct ima_namespace *ns = get_current_ns();
> +	struct ima_namespace *ns = m->private;
>  	struct ima_queue_entry *qe = v;
>  
>  	/* lock protects when reading beyond last element
> @@ -195,9 +211,26 @@ static const struct seq_operations ima_measurments_seqops = {
>  	.show = ima_measurements_show
>  };
>  
> +static int ima_seq_open(struct file *file, const struct seq_operations *seq_ops)
> +{
> +	struct user_namespace *user_ns = ima_user_ns_from_file(file);
> +	struct ima_namespace *ns = user_ns->ima_ns;
> +	struct seq_file *seq;
> +	int err;
> +
> +	err = seq_open(file, seq_ops);
> +	if (err)
> +		return err;
> +
> +	seq = file->private_data;
> +	seq->private = ns;
> +
> +	return 0;
> +}
> +
>  static int ima_measurements_open(struct inode *inode, struct file *file)
>  {
> -	return seq_open(file, &ima_measurments_seqops);
> +	return ima_seq_open(file, &ima_measurments_seqops);
>  }
>  
>  static const struct file_operations ima_measurements_ops = {
> @@ -263,7 +296,7 @@ static const struct seq_operations ima_ascii_measurements_seqops = {
>  
>  static int ima_ascii_measurements_open(struct inode *inode, struct file *file)
>  {
> -	return seq_open(file, &ima_ascii_measurements_seqops);
> +	return ima_seq_open(file, &ima_ascii_measurements_seqops);
>  }
>  
>  static const struct file_operations ima_ascii_measurements_ops = {
> @@ -273,9 +306,8 @@ static const struct file_operations ima_ascii_measurements_ops = {
>  	.release = seq_release,
>  };
>  
> -static ssize_t ima_read_policy(char *path)
> +static ssize_t ima_read_policy(struct ima_namespace *ns, char *path)
>  {
> -	struct ima_namespace *ns = get_current_ns();
>  	void *data = NULL;
>  	char *datap;
>  	size_t size;
> @@ -314,10 +346,23 @@ static ssize_t ima_read_policy(char *path)
>  		return pathlen;
>  }
>  
> +static struct ima_namespace *ima_filp_private(struct file *filp)
> +{
> +	if (!(filp->f_flags & O_WRONLY)) {
> +#ifdef CONFIG_IMA_READ_POLICY
> +		struct seq_file *seq;
> +
> +		seq = filp->private_data;
> +		return seq->private;
> +#endif
> +	}
> +	return filp->private_data;
> +}

All of that isn't needed with my last proposal. You don't need to stash
anything anywhere. I showed that in my previous patch suggestion. The
original filp is stashed in the seq_file's private member, i.e. taking

ima_measurements_start(struct seq_file *m, loff_t *pos)

you can get at:

const struct file *filp = m->file;
struct user_namespace *user_ns = file_inode(filp)->i_sb->s_user_ns;
struct ima_namespace *ns = user_ns->ima_ns;

Re: [PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability

[Serge E. Hallyn]

On Fri, Dec 10, 2021 at 02:47:34PM -0500, Stefan Berger wrote:
> Use mac_admin_ns_capable() to check corresponding capability to allow
> read/write IMA policy without CAP_SYS_ADMIN but with CAP_MAC_ADMIN.
> 
> Signed-off-by: Denis Semakin <denis.semakin@huawei.com>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> ---
>  include/linux/capability.h      | 6 ++++++
>  security/integrity/ima/ima_fs.c | 2 +-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index 65efb74c3585..991579178f32 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -270,6 +270,12 @@ static inline bool checkpoint_restore_ns_capable(struct user_namespace *ns)
>  		ns_capable(ns, CAP_SYS_ADMIN);
>  }
>  
> +static inline bool mac_admin_ns_capable(struct user_namespace *ns)
> +{
> +	return ns_capable(ns, CAP_MAC_ADMIN) ||
> +		ns_capable(ns, CAP_SYS_ADMIN);
> +}
> +
>  /* audit system wants to get cap info from files as well */
>  int get_vfs_caps_from_disk(struct user_namespace *mnt_userns,
>  			   const struct dentry *dentry,
> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
> index a136d14f29ec..090ee85bfa3a 100644
> --- a/security/integrity/ima/ima_fs.c
> +++ b/security/integrity/ima/ima_fs.c
> @@ -440,7 +440,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
>  #else
>  		if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
>  			return -EACCES;
> -		if (!capable(CAP_SYS_ADMIN))
> +		if (!mac_admin_ns_capable(user_ns))

Sorry if I'm missing something.  But I'm looking at your tree's
version of ima_update_policy() and failing to see where it adds
extra capability checks.  Note that any unprivileged user can
unshare a user namespace, map its hostuid to nsuid 0, and pass
ns_capable(CAP_MAC_ADMIN).

Likewise, a host uid 0 process which does not have CAP_MAC_ADMIN
can create a new user namespace, map hostuid 0 to nsuid 0, and
have CAP_MAC_ADMIN against the new userns.

Somewhere you need to be checking for privilege against either
the parent ns or the init_user_ns.  I'm not seeing where that's
being done.  Can you point me to it?


>  			return -EPERM;
>  		return ima_seq_open(filp, &ima_policy_seqops);
>  #endif
> -- 
> 2.31.1

Re: [PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability

[James Bottomley]

On Sat, 2021-12-11 at 09:29 -0600, Serge E. Hallyn wrote:
> On Fri, Dec 10, 2021 at 02:47:34PM -0500, Stefan Berger wrote:
> > Use mac_admin_ns_capable() to check corresponding capability to
> > allow
> > read/write IMA policy without CAP_SYS_ADMIN but with CAP_MAC_ADMIN.
> > 
> > Signed-off-by: Denis Semakin <denis.semakin@huawei.com>
> > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > ---
> >  include/linux/capability.h      | 6 ++++++
> >  security/integrity/ima/ima_fs.c | 2 +-
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/capability.h
> > b/include/linux/capability.h
> > index 65efb74c3585..991579178f32 100644
> > --- a/include/linux/capability.h
> > +++ b/include/linux/capability.h
> > @@ -270,6 +270,12 @@ static inline bool
> > checkpoint_restore_ns_capable(struct user_namespace *ns)
> >  		ns_capable(ns, CAP_SYS_ADMIN);
> >  }
> >  
> > +static inline bool mac_admin_ns_capable(struct user_namespace *ns)
> > +{
> > +	return ns_capable(ns, CAP_MAC_ADMIN) ||
> > +		ns_capable(ns, CAP_SYS_ADMIN);
> > +}
> > +
> >  /* audit system wants to get cap info from files as well */
> >  int get_vfs_caps_from_disk(struct user_namespace *mnt_userns,
> >  			   const struct dentry *dentry,
> > diff --git a/security/integrity/ima/ima_fs.c
> > b/security/integrity/ima/ima_fs.c
> > index a136d14f29ec..090ee85bfa3a 100644
> > --- a/security/integrity/ima/ima_fs.c
> > +++ b/security/integrity/ima/ima_fs.c
> > @@ -440,7 +440,7 @@ static int ima_open_policy(struct inode *inode,
> > struct file *filp)
> >  #else
> >  		if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
> >  			return -EACCES;
> > -		if (!capable(CAP_SYS_ADMIN))
> > +		if (!mac_admin_ns_capable(user_ns))
> 
> Sorry if I'm missing something.  But I'm looking at your tree's
> version of ima_update_policy() and failing to see where it adds
> extra capability checks.  Note that any unprivileged user can
> unshare a user namespace, map its hostuid to nsuid 0, and pass
> ns_capable(CAP_MAC_ADMIN).
> 
> Likewise, a host uid 0 process which does not have CAP_MAC_ADMIN
> can create a new user namespace, map hostuid 0 to nsuid 0, and
> have CAP_MAC_ADMIN against the new userns.
> 
> Somewhere you need to be checking for privilege against either
> the parent ns or the init_user_ns.  I'm not seeing where that's
> being done.  Can you point me to it?

I think you're thinking of my patches, which used a single ima log for
everything.  With Stefan's patches, each namespace gets its own log and
starts out with and empty "do nothing" policy.  However, whatever
policy was active in the parent namespace is still run for activities
in  the child, so any activity the parent requires to be
measured/audited/appraised etc still happens, but all entries are made
in the parent.

James

Re: [PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability

[Serge E. Hallyn]

On Sat, Dec 11, 2021 at 11:05:10AM -0500, James Bottomley wrote:
> On Sat, 2021-12-11 at 09:29 -0600, Serge E. Hallyn wrote:
> > On Fri, Dec 10, 2021 at 02:47:34PM -0500, Stefan Berger wrote:
> > > Use mac_admin_ns_capable() to check corresponding capability to
> > > allow
> > > read/write IMA policy without CAP_SYS_ADMIN but with CAP_MAC_ADMIN.
> > > 
> > > Signed-off-by: Denis Semakin <denis.semakin@huawei.com>
> > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > > ---
> > >  include/linux/capability.h      | 6 ++++++
> > >  security/integrity/ima/ima_fs.c | 2 +-
> > >  2 files changed, 7 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/include/linux/capability.h
> > > b/include/linux/capability.h
> > > index 65efb74c3585..991579178f32 100644
> > > --- a/include/linux/capability.h
> > > +++ b/include/linux/capability.h
> > > @@ -270,6 +270,12 @@ static inline bool
> > > checkpoint_restore_ns_capable(struct user_namespace *ns)
> > >  		ns_capable(ns, CAP_SYS_ADMIN);
> > >  }
> > >  
> > > +static inline bool mac_admin_ns_capable(struct user_namespace *ns)
> > > +{
> > > +	return ns_capable(ns, CAP_MAC_ADMIN) ||
> > > +		ns_capable(ns, CAP_SYS_ADMIN);
> > > +}
> > > +
> > >  /* audit system wants to get cap info from files as well */
> > >  int get_vfs_caps_from_disk(struct user_namespace *mnt_userns,
> > >  			   const struct dentry *dentry,
> > > diff --git a/security/integrity/ima/ima_fs.c
> > > b/security/integrity/ima/ima_fs.c
> > > index a136d14f29ec..090ee85bfa3a 100644
> > > --- a/security/integrity/ima/ima_fs.c
> > > +++ b/security/integrity/ima/ima_fs.c
> > > @@ -440,7 +440,7 @@ static int ima_open_policy(struct inode *inode,
> > > struct file *filp)
> > >  #else
> > >  		if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
> > >  			return -EACCES;
> > > -		if (!capable(CAP_SYS_ADMIN))
> > > +		if (!mac_admin_ns_capable(user_ns))
> > 
> > Sorry if I'm missing something.  But I'm looking at your tree's
> > version of ima_update_policy() and failing to see where it adds
> > extra capability checks.  Note that any unprivileged user can
> > unshare a user namespace, map its hostuid to nsuid 0, and pass
> > ns_capable(CAP_MAC_ADMIN).
> > 
> > Likewise, a host uid 0 process which does not have CAP_MAC_ADMIN
> > can create a new user namespace, map hostuid 0 to nsuid 0, and
> > have CAP_MAC_ADMIN against the new userns.
> > 
> > Somewhere you need to be checking for privilege against either
> > the parent ns or the init_user_ns.  I'm not seeing where that's
> > being done.  Can you point me to it?
> 
> I think you're thinking of my patches, which used a single ima log for
> everything.  With Stefan's patches, each namespace gets its own log and
> starts out with and empty "do nothing" policy.  However, whatever
> policy was active in the parent namespace is still run for activities
> in  the child, so any activity the parent requires to be
> measured/audited/appraised etc still happens, but all entries are made
> in the parent.

Oh.  Stefan had previously said that one motivation was to do less logging
in the hostns, so I assumed that a child ns policy could make it so the
parent ns policy was no longer applied.  If that's not the case, and not
planned, then that makes this a lot simpler.

Re: [PATCH v6 15/17] ima: Use mac_admin_ns_capable() to check corresponding capability

[James Bottomley]

On Sat, 2021-12-11 at 13:22 -0600, Serge E. Hallyn wrote:
> On Sat, Dec 11, 2021 at 11:05:10AM -0500, James Bottomley wrote:
> > On Sat, 2021-12-11 at 09:29 -0600, Serge E. Hallyn wrote:
> > > On Fri, Dec 10, 2021 at 02:47:34PM -0500, Stefan Berger wrote:
> > > > Use mac_admin_ns_capable() to check corresponding capability to
> > > > allow
> > > > read/write IMA policy without CAP_SYS_ADMIN but with
> > > > CAP_MAC_ADMIN.
> > > > 
> > > > Signed-off-by: Denis Semakin <denis.semakin@huawei.com>
> > > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > > > ---
> > > >  include/linux/capability.h      | 6 ++++++
> > > >  security/integrity/ima/ima_fs.c | 2 +-
> > > >  2 files changed, 7 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/include/linux/capability.h
> > > > b/include/linux/capability.h
> > > > index 65efb74c3585..991579178f32 100644
> > > > --- a/include/linux/capability.h
> > > > +++ b/include/linux/capability.h
> > > > @@ -270,6 +270,12 @@ static inline bool
> > > > checkpoint_restore_ns_capable(struct user_namespace *ns)
> > > >  		ns_capable(ns, CAP_SYS_ADMIN);
> > > >  }
> > > >  
> > > > +static inline bool mac_admin_ns_capable(struct user_namespace
> > > > *ns)
> > > > +{
> > > > +	return ns_capable(ns, CAP_MAC_ADMIN) ||
> > > > +		ns_capable(ns, CAP_SYS_ADMIN);
> > > > +}
> > > > +
> > > >  /* audit system wants to get cap info from files as well */
> > > >  int get_vfs_caps_from_disk(struct user_namespace *mnt_userns,
> > > >  			   const struct dentry *dentry,
> > > > diff --git a/security/integrity/ima/ima_fs.c
> > > > b/security/integrity/ima/ima_fs.c
> > > > index a136d14f29ec..090ee85bfa3a 100644
> > > > --- a/security/integrity/ima/ima_fs.c
> > > > +++ b/security/integrity/ima/ima_fs.c
> > > > @@ -440,7 +440,7 @@ static int ima_open_policy(struct inode
> > > > *inode,
> > > > struct file *filp)
> > > >  #else
> > > >  		if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
> > > >  			return -EACCES;
> > > > -		if (!capable(CAP_SYS_ADMIN))
> > > > +		if (!mac_admin_ns_capable(user_ns))
> > > 
> > > Sorry if I'm missing something.  But I'm looking at your tree's
> > > version of ima_update_policy() and failing to see where it adds
> > > extra capability checks.  Note that any unprivileged user can
> > > unshare a user namespace, map its hostuid to nsuid 0, and pass
> > > ns_capable(CAP_MAC_ADMIN).
> > > 
> > > Likewise, a host uid 0 process which does not have CAP_MAC_ADMIN
> > > can create a new user namespace, map hostuid 0 to nsuid 0, and
> > > have CAP_MAC_ADMIN against the new userns.
> > > 
> > > Somewhere you need to be checking for privilege against either
> > > the parent ns or the init_user_ns.  I'm not seeing where that's
> > > being done.  Can you point me to it?
> > 
> > I think you're thinking of my patches, which used a single ima log
> > for everything.  With Stefan's patches, each namespace gets its own
> > log and starts out with and empty "do nothing" policy.  However,
> > whatever policy was active in the parent namespace is still run for
> > activities in  the child, so any activity the parent requires to be
> > measured/audited/appraised etc still happens, but all entries are
> > made in the parent.
> 
> Oh.  Stefan had previously said that one motivation was to do less
> logging in the hostns, so I assumed that a child ns policy could make
> it so the parent ns policy was no longer applied.

Well, the default policy even for the init_user_ns is don't log
anything, so you can keep that if you don't care.  However, if you do
care you can log all the containers.  If the containers install a
logging policy, that log will disappear when the namespace is reaped,
so if the hostns has a no log policy, all the log space the child used
will be freed.

James


>   If that's not the case, and not planned, then that makes this a lot
> simpler.
> 

Re: [PATCH v6 12/17] securityfs: Extend securityfs with namespacing support

[Stefan Berger]

On 12/11/21 05:50, Christian Brauner wrote:
> On Fri, Dec 10, 2021 at 02:47:31PM -0500, Stefan Berger wrote:
>> Extend 'securityfs' for support of IMA namespacing so that each
>> IMA (user) namespace can have its own front-end for showing the currently
>> active policy, the measurement list, number of violations and so on.
>>
>> Drop the addition dentry reference and simplify cleanup to work without
>> the additional reference. This enables simple cleanup of dentries upon
>> umount.
>>
>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
>> ---
>>   security/inode.c | 14 ++++----------
>>   1 file changed, 4 insertions(+), 10 deletions(-)
>>
>> diff --git a/security/inode.c b/security/inode.c
>> index fee01ff4d831..c77ae8ecc464 100644
>> --- a/security/inode.c
>> +++ b/security/inode.c
>> @@ -54,7 +54,7 @@ static int securityfs_fill_super(struct super_block *sb, struct fs_context *fc)
>>   
>>   static int securityfs_get_tree(struct fs_context *fc)
>>   {
>> -	return get_tree_single(fc, securityfs_fill_super);
>> +	return get_tree_keyed(fc, securityfs_fill_super, fc->user_ns);
>>   }
>>   
>>   static const struct fs_context_operations securityfs_context_ops = {
>> @@ -72,6 +72,7 @@ static struct file_system_type fs_type = {
>>   	.name =		"securityfs",
>>   	.init_fs_context = securityfs_init_fs_context,
>>   	.kill_sb =	kill_litter_super,
>> +	.fs_flags =	FS_USERNS_MOUNT,
>>   };
>>   
>>   /**
>> @@ -168,7 +169,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
>>   		inode->i_fop = fops;
>>   	}
>>   	d_instantiate(dentry, inode);
>> -	dget(dentry);
>>   	inode_unlock(dir);
>>   	return dentry;
>>   
>> @@ -306,23 +306,17 @@ EXPORT_SYMBOL_GPL(securityfs_create_symlink);
>>   void securityfs_remove(struct dentry *dentry)
>>   {
>>   	struct user_namespace *ns;
>> -	struct inode *dir;
>>   
>>   	if (!dentry || IS_ERR(dentry))
>>   		return;
>>   
>>   	ns = dentry->d_sb->s_user_ns;
>>   
>> -	dir = d_inode(dentry->d_parent);
>> -	inode_lock(dir);
>>   	if (simple_positive(dentry)) {
>> -		if (d_is_dir(dentry))
>> -			simple_rmdir(dir, dentry);
>> -		else
>> -			simple_unlink(dir, dentry);
>> +		d_delete(dentry);
>>   		dput(dentry);
> In
> https://lore.kernel.org/lkml/20211210114934.tacjnwryihrsx6ln@wittgenstein
> I explained why d_delete()+d_put() only is wrong and how to fix it.


Fixed for v7.

Re: [PATCH v6 14/17] ima: Tie opened SecurityFS files to the IMA namespace it belongs to

[Stefan Berger]

On 12/11/21 06:00, Christian Brauner wrote:
> On Fri, Dec 10, 2021 at 02:47:33PM -0500, Stefan Berger wrote:
>> Tie IMA's files in SecurityFS to the IMA namespace they belong to so that
>> also file descriptor that were passed or inherited to other user/IMA
>> namespaces will always access the data of the IMA namespace they originally
>> belonged to.
>>
>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>> ---
>>   security/integrity/ima/ima_fs.c     | 74 ++++++++++++++++++++++++-----
>>   security/integrity/ima/ima_policy.c |  4 +-
>>   2 files changed, 63 insertions(+), 15 deletions(-)
>>
>> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
>> index 0e582ceecc7f..a136d14f29ec 100644
>> --- a/security/integrity/ima/ima_fs.c
>> +++ b/security/integrity/ima/ima_fs.c
>> @@ -35,6 +35,20 @@ static int __init default_canonical_fmt_setup(char *str)
>>   }
>>   __setup("ima_canonical_fmt", default_canonical_fmt_setup);
>>   
>> +static inline struct user_namespace *ima_user_ns_from_file(struct file *filp)
>> +{
>> +	return filp->f_path.mnt->mnt_sb->s_user_ns;
>> +}
> I'd probably rewrite this as:
>
> static inline struct user_namespace *ima_user_ns_from_file(const struct file *filp)
> {
> 	return file_inode(filp)->i_sb->s_user_ns;
> }
>
> as it spares you some pointer chasing and also looks cleaner.

Ok. This patch is being absorbed by all the functions currently using 
get_current_ns() and should access it via the file instead.

    Stefan

Re: [PATCH v6 01/17] ima: Add IMA namespace support

[Stefan Berger]

On 12/10/21 14:47, Stefan Berger wrote:
> Implement an IMA namespace data structure that gets created alongside a
> user namespace with CLONE_NEWUSER. This lays down the foundation for
> namespacing the different aspects of IMA (eg. IMA-audit, IMA-measurement,
> IMA-appraisal).
>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> ---
>   include/linux/ima.h                      | 37 +++++++++++++
>   include/linux/user_namespace.h           |  4 ++
>   init/Kconfig                             | 10 ++++
>   kernel/user.c                            |  7 +++
>   kernel/user_namespace.c                  |  8 +++
>   security/integrity/ima/Makefile          |  3 +-
>   security/integrity/ima/ima.h             |  4 ++
>   security/integrity/ima/ima_init.c        |  4 ++
>   security/integrity/ima/ima_init_ima_ns.c | 32 +++++++++++
>   security/integrity/ima/ima_ns.c          | 69 ++++++++++++++++++++++++
>   10 files changed, 177 insertions(+), 1 deletion(-)
>   create mode 100644 security/integrity/ima/ima_init_ima_ns.c
>   create mode 100644 security/integrity/ima/ima_ns.c
>
> diff --git a/include/linux/ima.h b/include/linux/ima.h
> index b6ab66a546ae..f282e40c316c 100644
> --- a/include/linux/ima.h
> +++ b/include/linux/ima.h
> @@ -11,6 +11,7 @@
>   #include <linux/fs.h>
>   #include <linux/security.h>
>   #include <linux/kexec.h>
> +#include <linux/user_namespace.h>
>   #include <crypto/hash_info.h>
>   struct linux_binprm;
>   
> @@ -210,6 +211,42 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
>   }
>   #endif /* CONFIG_IMA_APPRAISE */
>   
> +struct ima_namespace {
> +	int avoid_zero_size;
> +};


I moved the structure to security/integrity/ima/ima.h for v7 and added 
__randomize_layout to it.

   Stefan

Re: [PATCH v6 06/17] ima: Move policy related variables into ima_namespace

[Stefan Berger]

On 12/10/21 14:47, Stefan Berger wrote:
> @@ -357,7 +359,7 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,
>   
>   		rc = is_binary_blacklisted(digest, digestsize);
>   		if ((rc == -EPERM) && (iint->flags & IMA_MEASURE))
> -			process_buffer_measurement(&init_user_ns, NULL, digest, digestsize,
> +			process_buffer_measurement(ns, &init_user_ns, NULL, digest, digestsize,
>   						   "blacklisted-hash", NONE,
>   						   pcr, NULL, false, NULL, 0);
>   	}
> @@ -527,14 +529,15 @@ void ima_inode_post_setattr(struct user_namespace *mnt_userns,
>   			    struct dentry *dentry)
>   {
>   	struct inode *inode = d_backing_inode(dentry);
> +	struct ima_namespace *ns = get_current_ns();

I am getting the ima_namespace now from the dentry in the 3 locations in 
this file.

   Stefan

Re: [PATCH v6 01/17] ima: Add IMA namespace support

[Mimi Zohar]

On Mon, 2021-12-13 at 16:11 -0500, Stefan Berger wrote:
> On 12/10/21 14:47, Stefan Berger wrote:
> > Implement an IMA namespace data structure that gets created alongside a
> > user namespace with CLONE_NEWUSER. This lays down the foundation for
> > namespacing the different aspects of IMA (eg. IMA-audit, IMA-measurement,
> > IMA-appraisal).
> >
> > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> > ---
> >   include/linux/ima.h                      | 37 +++++++++++++
> >   include/linux/user_namespace.h           |  4 ++
> >   init/Kconfig                             | 10 ++++
> >   kernel/user.c                            |  7 +++
> >   kernel/user_namespace.c                  |  8 +++
> >   security/integrity/ima/Makefile          |  3 +-
> >   security/integrity/ima/ima.h             |  4 ++
> >   security/integrity/ima/ima_init.c        |  4 ++
> >   security/integrity/ima/ima_init_ima_ns.c | 32 +++++++++++
> >   security/integrity/ima/ima_ns.c          | 69 ++++++++++++++++++++++++
> >   10 files changed, 177 insertions(+), 1 deletion(-)
> >   create mode 100644 security/integrity/ima/ima_init_ima_ns.c
> >   create mode 100644 security/integrity/ima/ima_ns.c
> >
> > diff --git a/include/linux/ima.h b/include/linux/ima.h
> > index b6ab66a546ae..f282e40c316c 100644
> > --- a/include/linux/ima.h
> > +++ b/include/linux/ima.h
> > @@ -11,6 +11,7 @@
> >   #include <linux/fs.h>
> >   #include <linux/security.h>
> >   #include <linux/kexec.h>
> > +#include <linux/user_namespace.h>
> >   #include <crypto/hash_info.h>
> >   struct linux_binprm;
> >   
> > @@ -210,6 +211,42 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
> >   }
> >   #endif /* CONFIG_IMA_APPRAISE */
> >   
> > +struct ima_namespace {
> > +	int avoid_zero_size;
> > +};
> 
> 
> I moved the structure to security/integrity/ima/ima.h for v7 and added 
> __randomize_layout to it.

Much better than being in the public ima.h.

thanks!

Mimi

Re: [PATCH v6 01/17] ima: Add IMA namespace support

[Mimi Zohar]

Hi Stefan,

On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> Implement an IMA namespace data structure that gets created alongside a
> user namespace with CLONE_NEWUSER. This lays down the foundation for
> namespacing the different aspects of IMA (eg. IMA-audit, IMA-measurement,
> IMA-appraisal).
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>

Thanks, this patch set is looking a lot better.  Hopefully it isn't
premature for generic comments:

- With the SPDX line, the license info should be removed.

thanks,

Mimi

Re: [PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data

[Mimi Zohar]

Hi Stefan,

On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> 
> This patch adds an rbtree to the IMA namespace structure that stores a
> namespaced version of iint->flags in ns_status struct. Similar to the
> integrity_iint_cache, both the iint ns_struct are looked up using the
> inode pointer value. The lookup, allocate, and insertion code is also
> similar, except ns_struct is not free'd when the inode is free'd.
> Instead, the lookup verifies the i_ino and i_generation fields are also a
> match.
> 
> Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

Again, hopefully it isn't premature for generic comments:

- Function/inline comments would be appreciated, especially when the
code differs from the original code.  Example below.

> diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
> index f820686baf9f..08781a44f7bf 100644
> --- a/security/integrity/ima/ima_init_ima_ns.c
> +++ b/security/integrity/ima/ima_init_ima_ns.c
> @@ -14,11 +14,18 @@
>  #include <linux/user_namespace.h>
>  #include <linux/ima.h>
>  #include <linux/proc_ns.h>
> +#include <linux/slab.h>
>  
>  #include "ima.h"
>  
>  int ima_init_namespace(struct ima_namespace *ns)
>  {
> +	ns->ns_status_tree = RB_ROOT;
> +	rwlock_init(&ns->ns_status_lock);
> +	ns->ns_status_cache = KMEM_CACHE(ns_status, SLAB_PANIC);
> +	if (!ns->ns_status_cache)
> +		return -ENOMEM;
> +

For example, using KMEM_CACHE() is probably correct here, at least for
now, but it is different than the original code which uses
kmem_cache_alloc() with init_once().  Memory cleanup is done on free,
before it is re-used.

thanks,

Mimi

>  	return 0;
>  }

Re: [PATCH v6 03/17] ima: Namespace audit status flags

[Mimi Zohar]

On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> 
> The iint cache stores whether the file is measured, appraised, audited
> etc. This patch moves the IMA_AUDITED flag into the per-namespace
> ns_status, enabling IMA audit mechanism to audit the same file each time
> it is accessed in a new namespace.
> 
> The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if
> any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not
> enabled.

^none of the ... are enabled.

thanks,

Mimi

> 
> Read and write operations on the iint flags is replaced with function
> calls. For reading, iint_flags() returns the bitwise AND of iint->flags
> and ns_status->flags. The ns_status flags are masked with
> IMA_NS_STATUS_FLAGS (currently only IMA_AUDITED). Similarly
> set_iint_flags() only writes the masked portion to the ns_status flags,
> while the iint flags is set as before. The ns_status parameter added to
> ima_audit_measurement() is used with the above functions to query and
> set the ns_status flags.
> 

Re: [PATCH v6 17/17] ima: Setup securityfs for IMA namespace

[Mimi Zohar]

Hi Stefan, James,

On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> Setup securityfs with symlinks, directories, and files for IMA
> namespacing support. The same directory structure that IMA uses on the
> host is also created for the namespacing case.
> 
> The securityfs file and directory ownerships cannot be set when the
> IMA namespace is initialized. Therefore, delay the setup of the file
> system to a later point when securityfs is in securityfs_fill_super.
> 
> This filesystem can now be mounted as follows:
> 
> mount -t securityfs /sys/kernel/security/ /sys/kernel/security/
> 
> The following directories, symlinks, and files are then available.
> 
> $ ls -l sys/kernel/security/
> total 0
> lr--r--r--. 1 root root 0 Dec  2 00:18 ima -> integrity/ima
> drwxr-xr-x. 3 root root 0 Dec  2 00:18 integrity

The ima symlink was introduced for backwards compatibilty.  Refer to
commit 0c343af8065b ("integrity: Add an integrity directory in
securityfs").  The symlink shouldn't need to be supported in IMA
namespace.

thanks,

Mimi

> 
> $ ls -l sys/kernel/security/ima/
> total 0
> -r--r-----. 1 root root 0 Dec  2 00:18 ascii_runtime_measurements
> -r--r-----. 1 root root 0 Dec  2 00:18 binary_runtime_measurements
> -rw-------. 1 root root 0 Dec  2 00:18 policy
> -r--r-----. 1 root root 0 Dec  2 00:18 runtime_measurements_count
> -r--r-----. 1 root root 0 Dec  2 00:18 violations
> 
> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

Re: [PATCH v6 01/17] ima: Add IMA namespace support

[Stefan Berger]

On 12/15/21 16:10, Mimi Zohar wrote:
> Hi Stefan,
>
> On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
>> Implement an IMA namespace data structure that gets created alongside a
>> user namespace with CLONE_NEWUSER. This lays down the foundation for
>> namespacing the different aspects of IMA (eg. IMA-audit, IMA-measurement,
>> IMA-appraisal).
>>
>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>> Suggested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> Thanks, this patch set is looking a lot better.  Hopefully it isn't
> premature for generic comments:
>
> - With the SPDX line, the license info should be removed.

Removed the references to GPL.


>
> thanks,
>
> Mimi
>

Re: [PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data

[Stefan Berger]

On 12/15/21 16:12, Mimi Zohar wrote:
> Hi Stefan,
>
> On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
>> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
>>
>> This patch adds an rbtree to the IMA namespace structure that stores a
>> namespaced version of iint->flags in ns_status struct. Similar to the
>> integrity_iint_cache, both the iint ns_struct are looked up using the
>> inode pointer value. The lookup, allocate, and insertion code is also
>> similar, except ns_struct is not free'd when the inode is free'd.
>> Instead, the lookup verifies the i_ino and i_generation fields are also a
>> match.
>>
>> Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> Again, hopefully it isn't premature for generic comments:
>
> - Function/inline comments would be appreciated, especially when the
> code differs from the original code.  Example below.
>
>> diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
>> index f820686baf9f..08781a44f7bf 100644
>> --- a/security/integrity/ima/ima_init_ima_ns.c
>> +++ b/security/integrity/ima/ima_init_ima_ns.c
>> @@ -14,11 +14,18 @@
>>   #include <linux/user_namespace.h>
>>   #include <linux/ima.h>
>>   #include <linux/proc_ns.h>
>> +#include <linux/slab.h>
>>   
>>   #include "ima.h"
>>   
>>   int ima_init_namespace(struct ima_namespace *ns)
>>   {
>> +	ns->ns_status_tree = RB_ROOT;
>> +	rwlock_init(&ns->ns_status_lock);
>> +	ns->ns_status_cache = KMEM_CACHE(ns_status, SLAB_PANIC);
>> +	if (!ns->ns_status_cache)
>> +		return -ENOMEM;
>> +
> For example, using KMEM_CACHE() is probably correct here, at least for
> now, but it is different than the original code which uses
> kmem_cache_alloc() with init_once().  Memory cleanup is done on free,
> before it is re-used.

KMEM_CACHE + kmem_cache_alloc/zalloc() are pretty common. What kind of 
comment would be helpful here?

    Stefan

>
> thanks,
>
> Mimi
>
>>   	return 0;
>>   }

Re: [PATCH v6 03/17] ima: Namespace audit status flags

[Stefan Berger]

On 12/15/21 16:15, Mimi Zohar wrote:
> On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
>> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
>>
>> The iint cache stores whether the file is measured, appraised, audited
>> etc. This patch moves the IMA_AUDITED flag into the per-namespace
>> ns_status, enabling IMA audit mechanism to audit the same file each time
>> it is accessed in a new namespace.
>>
>> The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if
>> any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not
>> enabled.
> ^none of the ... are enabled.

You want me to rephrase it?


>
> thanks,
>
> Mimi
>
>> Read and write operations on the iint flags is replaced with function
>> calls. For reading, iint_flags() returns the bitwise AND of iint->flags
>> and ns_status->flags. The ns_status flags are masked with
>> IMA_NS_STATUS_FLAGS (currently only IMA_AUDITED). Similarly
>> set_iint_flags() only writes the masked portion to the ns_status flags,
>> while the iint flags is set as before. The ns_status parameter added to
>> ima_audit_measurement() is used with the above functions to query and
>> set the ns_status flags.
>>

Re: [PATCH v6 17/17] ima: Setup securityfs for IMA namespace

[Stefan Berger]

On 12/15/21 16:31, Mimi Zohar wrote:
> Hi Stefan, James,
>
> On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
>> Setup securityfs with symlinks, directories, and files for IMA
>> namespacing support. The same directory structure that IMA uses on the
>> host is also created for the namespacing case.
>>
>> The securityfs file and directory ownerships cannot be set when the
>> IMA namespace is initialized. Therefore, delay the setup of the file
>> system to a later point when securityfs is in securityfs_fill_super.
>>
>> This filesystem can now be mounted as follows:
>>
>> mount -t securityfs /sys/kernel/security/ /sys/kernel/security/
>>
>> The following directories, symlinks, and files are then available.
>>
>> $ ls -l sys/kernel/security/
>> total 0
>> lr--r--r--. 1 root root 0 Dec  2 00:18 ima -> integrity/ima
>> drwxr-xr-x. 3 root root 0 Dec  2 00:18 integrity
> The ima symlink was introduced for backwards compatibilty.  Refer to
> commit 0c343af8065b ("integrity: Add an integrity directory in
> securityfs").  The symlink shouldn't need to be supported in IMA
> namespace.

That's backwards compatibility for applications and scripts. If we want 
to have these running unmodified inside IMA namespaces I think it's 
better to keep the symbolic link and not treat the IMA namespaces any 
different than the host.

    Stefan

>
> thanks,
>
> Mimi
>
>> $ ls -l sys/kernel/security/ima/
>> total 0
>> -r--r-----. 1 root root 0 Dec  2 00:18 ascii_runtime_measurements
>> -r--r-----. 1 root root 0 Dec  2 00:18 binary_runtime_measurements
>> -rw-------. 1 root root 0 Dec  2 00:18 policy
>> -r--r-----. 1 root root 0 Dec  2 00:18 runtime_measurements_count
>> -r--r-----. 1 root root 0 Dec  2 00:18 violations
>>
>> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
>> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

Re: [PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data

[Mimi Zohar]

On Wed, 2021-12-15 at 21:37 -0500, Stefan Berger wrote:
> On 12/15/21 16:12, Mimi Zohar wrote:
> > Hi Stefan,
> >
> > On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> >> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> >>
> >> This patch adds an rbtree to the IMA namespace structure that stores a
> >> namespaced version of iint->flags in ns_status struct. Similar to the
> >> integrity_iint_cache, both the iint ns_struct are looked up using the
> >> inode pointer value. The lookup, allocate, and insertion code is also
> >> similar, except ns_struct is not free'd when the inode is free'd.
> >> Instead, the lookup verifies the i_ino and i_generation fields are also a
> >> match.
> >>
> >> Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> >> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > Again, hopefully it isn't premature for generic comments:
> >
> > - Function/inline comments would be appreciated, especially when the
> > code differs from the original code.  Example below.
> >
> >> diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
> >> index f820686baf9f..08781a44f7bf 100644
> >> --- a/security/integrity/ima/ima_init_ima_ns.c
> >> +++ b/security/integrity/ima/ima_init_ima_ns.c
> >> @@ -14,11 +14,18 @@
> >>   #include <linux/user_namespace.h>
> >>   #include <linux/ima.h>
> >>   #include <linux/proc_ns.h>
> >> +#include <linux/slab.h>
> >>   
> >>   #include "ima.h"
> >>   
> >>   int ima_init_namespace(struct ima_namespace *ns)
> >>   {
> >> +	ns->ns_status_tree = RB_ROOT;
> >> +	rwlock_init(&ns->ns_status_lock);
> >> +	ns->ns_status_cache = KMEM_CACHE(ns_status, SLAB_PANIC);
> >> +	if (!ns->ns_status_cache)
> >> +		return -ENOMEM;
> >> +
> > For example, using KMEM_CACHE() is probably correct here, at least for
> > now, but it is different than the original code which uses
> > kmem_cache_alloc() with init_once().  Memory cleanup is done on free,

^  kmem_cache_create() with init_once.

> > before it is re-used.
> 
> KMEM_CACHE + kmem_cache_alloc/zalloc() are pretty common. What kind of 
> comment would be helpful here?

The original reason for using kmem_cache_create() with init_once and
deferring memory cleanup to free was for performance.  Using
KMEM_CACHE() and kmem_cache_zalloc() instead could be for simplicity. 
The comment should note the change.

Mimi

Re: [PATCH v6 03/17] ima: Namespace audit status flags

[Mimi Zohar]

On Wed, 2021-12-15 at 21:38 -0500, Stefan Berger wrote:
> On 12/15/21 16:15, Mimi Zohar wrote:
> > On Fri, 2021-12-10 at 14:47 -0500, Stefan Berger wrote:
> >> From: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
> >>
> >> The iint cache stores whether the file is measured, appraised, audited
> >> etc. This patch moves the IMA_AUDITED flag into the per-namespace
> >> ns_status, enabling IMA audit mechanism to audit the same file each time
> >> it is accessed in a new namespace.
> >>
> >> The ns_status is not looked up if the CONFIG_IMA_NS is disabled or if
> >> any of the IMA_NS_STATUS_ACTIONS (currently only IMA_AUDIT) is not
> >> enabled.
> > ^none of the ... are enabled.
> 
> You want me to rephrase it?

Yes, please.

thanks,

Mimi

Re: [PATCH v6 02/17] ima: Define ns_status for storing namespaced iint data

[Stefan Berger]

On 12/15/21 22:53, Mimi Zohar wrote:
> On Wed, 2021-12-15 at 21:37 -0500, Stefan Berger wrote:
>
>>> before it is re-used.
>> KMEM_CACHE + kmem_cache_alloc/zalloc() are pretty common. What kind of
>> comment would be helpful here?
> The original reason for using kmem_cache_create() with init_once and
> deferring memory cleanup to free was for performance.  Using
> KMEM_CACHE() and kmem_cache_zalloc() instead could be for simplicity.
> The comment should note the change.

/* use KMEM_CACHE for simplicity */ ?


>
> Mimi
>