[PATCH v9 23/23] ima: Enable IMA namespaces

Stefan Berger
2022-01-25T23:09:44Z

From: Stefan Berger <stefanb@linux.ibm.com>

Introduce the IMA_NS in Kconfig for IMA namespace enablement.

Enable the lazy initialization of an IMA namespace when a user mounts
SecurityFS and writes '1' into IMA's 'active' securityfs file. A
user_namespace will now get a pointer to an ima_namespace and therefore
implement get_current_ns() for the namespacing case that returns this
pointer. Use get_current_ns() in those places that require access to the
current IMA namespace. In some places, primarily those related to
IMA-appraisal and changes to file attributes, keep the pointer to
init_ima_ns, since there flags related to file measurements may be
affected, which are not supported in IMA namespaces, yet.

Before using the ima_namespace pointer test it with ns_is_active()
to check whether it is NULL and whether the ima_namespace is active.
If it's not active, it cannot be used, yet. Therefore, return early
from those functions that may now get either get a NULL pointer from
this call or where ns->active is still 0. The init_ima_ns is always
set to be active, thus passing the check.

Implement ima_ns_from_file() for SecurityFS-related files where we can
now get the IMA namespace via the user namespace pointer associated
with the superblock of the SecurityFS filesystem instance.

Return -EACCES to IMA's securityfs files, except for the 'active' file,
until the IMA namespace has been set to active.

Switch access to userns->ima_ns to use acquire/release semantics to ensure
that a newly created ima_namespace structure is fully visible upon access.

Only emit the kernel log message 'policy update completed' for the
init_ima_ns.

Gate access to ima_appraise variable to init_ima_ns in ima_load_data().

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

---
v9:
- ima_post_key_create_or_update: Only handle key if in init_ima_ns
- Removed ns == NULL checks where user_namespace is now passed
- Defer setting of user_ns->ima_ns until end of ima_fs_ns_init();
required new ima_free_imans() and new user_ns_set_ima_ns()
- Only emit log message 'policy update completed' for init_ima_ns
- Introduce get_current_ns() only in this patch
- Check for ns == &init_ima_ns in ima_load_data()
---
include/linux/ima.h | 13 ++++
init/Kconfig | 13 ++++
kernel/user_namespace.c | 2 +
security/integrity/ima/ima.h | 51 ++++++++++++--
security/integrity/ima/ima_appraise.c | 3 +
security/integrity/ima/ima_asymmetric_keys.c | 6 +-
security/integrity/ima/ima_fs.c | 74 ++++++++++++++++----
security/integrity/ima/ima_init_ima_ns.c | 2 +
security/integrity/ima/ima_main.c | 35 +++++----
security/integrity/ima/ima_ns.c | 15 ++--
security/integrity/ima/ima_policy.c | 16 +++--
11 files changed, 188 insertions(+), 42 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index c584527c0f47..4e595bd9733e 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;

@@ -68,6 +69,18 @@ static inline const char * const *arch_get_ima_policy(void)
}
#endif

+static inline struct user_namespace
+*ima_ns_to_user_ns(struct ima_namespace *ns)
+{
+ struct user_namespace *user_ns;
+
+ user_ns = current_user_ns();
+#ifdef CONFIG_IMA_NS
+ WARN_ON(user_ns->ima_ns != ns);
+#endif
+ return user_ns;
+}
+
#else
static inline enum hash_algo ima_get_current_hash_algo(void)
{
diff --git a/init/Kconfig b/init/Kconfig
index 4b7bac10c72d..e27155e0ddba 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1247,6 +1247,19 @@ 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 n
+ help
+ Allow the creation of an IMA namespace 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

config CHECKPOINT_RESTORE
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 6b2e3ca7ee99..653f8fa83b69 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);
@@ -196,6 +197,7 @@ 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/ima.h b/security/integrity/ima/ima.h
index cf2f63bb5bdf..a0dbb1dccc8e 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -536,32 +536,70 @@ struct user_namespace *ima_user_ns_from_file(const struct file *filp)
return file_inode(filp)->i_sb->s_user_ns;
}

+#ifdef CONFIG_IMA_NS
+
static inline struct ima_namespace
*ima_ns_from_user_ns(struct user_namespace *user_ns)
{
- if (user_ns == &init_user_ns)
- return &init_ima_ns;
- return NULL;
+ /* Pairs with smp_store_releases() in user_ns_set_ima_ns(). */
+ return smp_load_acquire(&user_ns->ima_ns);
}

-#ifdef CONFIG_IMA_NS
+static inline void user_ns_set_ima_ns(struct user_namespace *user_ns,
+ struct ima_namespace *ns)
+{
+ /* Pairs with smp_load_acquire() in ima_ns_from_user_ns() */
+ smp_store_release(&user_ns->ima_ns, ns);
+}
+
+static inline struct ima_namespace *get_current_ns(void)
+{
+ return ima_ns_from_user_ns(current_user_ns());
+}

struct ima_namespace *create_ima_ns(void);

+void ima_free_ima_ns(struct ima_namespace *ns);
+
struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
struct inode *inode,
struct integrity_iint_cache *iint);

void ima_free_ns_status_tree(struct ima_namespace *ns);

+static inline struct ima_namespace *ima_ns_from_file(const struct file *filp)
+{
+ return ima_user_ns_from_file(filp)->ima_ns;
+}
+
#else

+static inline struct ima_namespace
+*ima_ns_from_user_ns(struct user_namespace *user_ns)
+{
+ if (user_ns == &init_user_ns)
+ return &init_ima_ns;
+ return NULL;
+}
+
+static inline void user_ns_set_ima_ns(struct user_namespace *user_ns,
+ struct ima_namespace *ns)
+{
+}
+
+static inline struct ima_namespace *get_current_ns(void)
+{
+ return &init_ima_ns;
+}
+
static inline struct ima_namespace *create_ima_ns(void)
{
WARN(1, "Cannot create an IMA namespace\n");
return ERR_PTR(-EFAULT);
}

+static inline void ima_free_ima_ns(struct ima_namespace *ns) {}
+
static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
struct inode *inode,
struct integrity_iint_cache *iint)
@@ -576,6 +614,11 @@ static inline struct ns_status *ima_get_ns_status(struct ima_namespace *ns,
return ns_status;
}

+static inline struct ima_namespace *ima_ns_from_file(const struct file *filp)
+{
+ return &init_ima_ns;
+}
+
#endif /* CONFIG_IMA_NS */

#endif /* __LINUX_IMA_H */
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 3461025f671b..2ad3327d7ce6 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -74,6 +74,9 @@ int ima_must_appraise(struct ima_namespace *ns,
{
u32 secid;

+ if (ns != &init_ima_ns)
+ return 0;
+
if (!ima_appraise)
return 0;

diff --git a/security/integrity/ima/ima_asymmetric_keys.c b/security/integrity/ima/ima_asymmetric_keys.c
index 70d87df26068..0d2cc1e23cde 100644
--- a/security/integrity/ima/ima_asymmetric_keys.c
+++ b/security/integrity/ima/ima_asymmetric_keys.c
@@ -30,9 +30,13 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
bool queued = false;

+ /* only handle key if related to init_ima_ns */
+ if (ns != &init_ima_ns)
+ return;
+
/* Only asymmetric keys are handled by this hook. */
if (key->type != &key_type_asymmetric)
return;
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 79a786db79db..f6fd3abcaebf 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -49,7 +49,10 @@ static ssize_t ima_show_htable_violations(struct file *filp,
char __user *buf,
size_t count, loff_t *ppos)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(filp);
+
+ if (!ns_is_active(ns))
+ return -EACCES;

return ima_show_htable_value(buf, count, ppos,
&ns->ima_htable.violations);
@@ -64,7 +67,10 @@ static ssize_t ima_show_measurements_count(struct file *filp,
char __user *buf,
size_t count, loff_t *ppos)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(filp);
+
+ if (!ns_is_active(ns))
+ return -EACCES;

return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len);
}
@@ -77,7 +83,7 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(m->file);
loff_t l = *pos;
struct ima_queue_entry *qe;

@@ -95,7 +101,7 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(m->file);
struct ima_queue_entry *qe = v;

/* lock protects when reading beyond last element
@@ -198,6 +204,11 @@ static const struct seq_operations ima_measurments_seqops = {

static int ima_measurements_open(struct inode *inode, struct file *file)
{
+ struct ima_namespace *ns = ima_ns_from_file(file);
+
+ if (!ns_is_active(ns))
+ return -EACCES;
+
return seq_open(file, &ima_measurments_seqops);
}

@@ -264,6 +275,11 @@ static const struct seq_operations ima_ascii_measurements_seqops = {

static int ima_ascii_measurements_open(struct inode *inode, struct file *file)
{
+ struct ima_namespace *ns = ima_ns_from_file(file);
+
+ if (!ns_is_active(ns))
+ return -EACCES;
+
return seq_open(file, &ima_ascii_measurements_seqops);
}

@@ -317,10 +333,13 @@ static ssize_t ima_read_policy(struct ima_namespace *ns, 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 = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(file);
char *data;
ssize_t result;

+ if (!ns_is_active(ns))
+ return -EACCES;
+
if (datalen >= PAGE_SIZE)
datalen = PAGE_SIZE - 1;

@@ -381,7 +400,10 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
#ifdef CONFIG_IMA_READ_POLICY
struct user_namespace *user_ns = ima_user_ns_from_file(filp);
#endif
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(filp);
+
+ if (!ns_is_active(ns))
+ return -EACCES;

if (!(filp->f_flags & O_WRONLY)) {
#ifndef CONFIG_IMA_READ_POLICY
@@ -408,7 +430,7 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(file);
const char *cause = ns->valid_policy ? "completed" : "failed";

if ((file->f_flags & O_ACCMODE) == O_RDONLY)
@@ -419,7 +441,8 @@ static int ima_release_policy(struct inode *inode, struct file *file)
ns->valid_policy = 0;
}

- pr_info("policy update %s\n", cause);
+ if (ns == &init_ima_ns)
+ pr_info("policy update %s\n", cause);
integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
"policy_update", cause, !ns->valid_policy, 0);

@@ -455,7 +478,7 @@ static ssize_t ima_show_active(struct file *filp,
char __user *buf,
size_t count, loff_t *ppos)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(filp);
char tmpbuf[2];
ssize_t len;

@@ -468,7 +491,7 @@ static ssize_t ima_write_active(struct file *filp,
const char __user *buf,
size_t count, loff_t *ppos)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(filp);
unsigned int active;
char tmpbuf[3];
ssize_t ret;
@@ -482,8 +505,11 @@ static ssize_t ima_write_active(struct file *filp,
return ret;
tmpbuf[ret] = 0;

- if (!kstrtouint(tmpbuf, 10, &active) && active == 1)
- atomic_set(&ns->active, 1);
+ if (!kstrtouint(tmpbuf, 10, &active) && active == 1) {
+ ret = ima_init_namespace(ns);
+ if (ret < 0)
+ count = -EINVAL;
+ }

return count;
}
@@ -518,11 +544,26 @@ int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root)
struct dentry *runtime_measurements_count = NULL;
struct dentry *violations = NULL;

+ /*
+ * While multiple superblocks can exist they are keyed by userns in
+ * s_fs_info for securityfs. The first time a userns mounts a
+ * securityfs instance we lazily allocate the ima_namespace for the
+ * userns since that's the only way a userns can meaningfully use ima.
+ * The vfs ensures we're the only one to call fill_super() and hence
+ * ima_fs_ns_init(), so we don't need any memory barriers here, i.e.
+ * user_ns->ima_ns can't change while we're in here.
+ */
+ if (!ns) {
+ ns = create_ima_ns();
+ if (IS_ERR(ns))
+ return PTR_ERR(ns);
+ }
+
/* 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 PTR_ERR(int_dir);
+ goto free_ns;
} else {
int_dir = integrity_dir;
}
@@ -575,6 +616,9 @@ int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root)
if (ns != &init_ima_ns && ima_fs_add_ns_files(ima_dir))
goto out;

+ if (!ima_ns_from_user_ns(user_ns))
+ user_ns_set_ima_ns(user_ns, ns);
+
return 0;
out:
securityfs_remove(ns->ima_policy);
@@ -587,6 +631,10 @@ int ima_fs_ns_init(struct user_namespace *user_ns, struct dentry *root)
if (user_ns != &init_user_ns)
securityfs_remove(int_dir);

+free_ns:
+ if (!ima_ns_from_user_ns(user_ns))
+ ima_free_ima_ns(ns);
+
return -1;
}

diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index 39ee0c2477a6..0ff587b874bd 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -46,6 +46,8 @@ int ima_init_namespace(struct ima_namespace *ns)
return rc;
}

+ atomic_set(&ns->active, 1);
+
return 0;
}

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 059917182960..1ffac9c04df1 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -506,7 +506,7 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
struct ima_template_desc *template = NULL;
struct file *file = vma->vm_file;
char filename[NAME_MAX];
@@ -519,7 +519,8 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
int pcr;

/* Is mprotect making an mmap'ed file executable? */
- if (!(ns->ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
+ if (!ns_is_active(ns) ||
+ !(ns->ima_policy_flag & IMA_APPRAISE) || !vma->vm_file ||
!(prot & PROT_EXEC) || (vma->vm_flags & VM_EXEC))
return 0;

@@ -655,9 +656,9 @@ static int __ima_inode_hash(struct ima_namespace *ns,
*/
int ima_file_hash(struct file *file, char *buf, size_t buf_size)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();

- if (!file)
+ if (!ns_is_active(ns) || !file)
return -EINVAL;

return __ima_inode_hash(ns, file_inode(file), buf, buf_size);
@@ -684,9 +685,9 @@ EXPORT_SYMBOL_GPL(ima_file_hash);
*/
int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();

- if (!inode)
+ if (!ns_is_active(ns) || !inode)
return -EINVAL;

return __ima_inode_hash(ns, inode, buf, buf_size);
@@ -705,11 +706,11 @@ EXPORT_SYMBOL_GPL(ima_inode_hash);
void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
struct inode *inode)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
struct integrity_iint_cache *iint;
int must_appraise;

- if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
+ if (!ns_is_active(ns) || !ns->ima_policy_flag || !S_ISREG(inode->i_mode))
return;

must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
@@ -738,12 +739,12 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
struct integrity_iint_cache *iint;
struct inode *inode = dentry->d_inode;
int must_appraise;

- if (!ns->ima_policy_flag || !S_ISREG(inode->i_mode))
+ if (!ns_is_active(ns) || !ns->ima_policy_flag || !S_ISREG(inode->i_mode))
return;

must_appraise = ima_must_appraise(ns, mnt_userns, inode, MAY_ACCESS,
@@ -827,6 +828,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
enum kernel_read_file_id read_id)
{
struct user_namespace *user_ns = current_user_ns();
+ struct ima_namespace *ns = ima_ns_from_user_ns(user_ns);
enum ima_hooks func;
u32 secid;

@@ -861,8 +863,12 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
*/
int ima_load_data(enum kernel_load_data_id id, bool contents)
{
+ struct ima_namespace *ns = get_current_ns();
bool ima_enforce, sig_enforce;

+ if (ns != &init_ima_ns)
+ return 0;
+
ima_enforce =
(ima_appraise & IMA_APPRAISE_ENFORCE) == IMA_APPRAISE_ENFORCE;

@@ -1070,10 +1076,10 @@ int process_buffer_measurement(struct ima_namespace *ns,
*/
void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
struct fd f;

- if (!buf || !size)
+ if (!ns_is_active(ns) || !buf || !size)
return;

f = fdget(kernel_fd);
@@ -1111,7 +1117,10 @@ 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 = &init_ima_ns;
+ struct ima_namespace *ns = get_current_ns();
+
+ if (!ns_is_active(ns))
+ return -EINVAL;

if (!event_name || !event_label || !buf || !buf_len)
return -ENOPARAM;
diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c
index 29af6fea2d74..244dc9d66fb1 100644
--- a/security/integrity/ima/ima_ns.c
+++ b/security/integrity/ima/ima_ns.c
@@ -26,22 +26,29 @@ struct ima_namespace *create_ima_ns(void)
/* destroy_ima_ns() must only be called after ima_init_namespace() was called */
static void destroy_ima_ns(struct ima_namespace *ns)
{
+ atomic_set(&ns->active, 0);
unregister_blocking_lsm_notifier(&ns->ima_lsm_policy_notifier);
kfree(ns->arch_policy_entry);
ima_free_policy_rules(ns);
ima_free_ns_status_tree(ns);
}

-void free_ima_ns(struct user_namespace *user_ns)
+void ima_free_ima_ns(struct ima_namespace *ns)
{
- struct ima_namespace *ns = user_ns->ima_ns;
-
if (!ns || WARN_ON(ns == &init_ima_ns))
return;

- destroy_ima_ns(ns);
+ if (ns_is_active(ns))
+ destroy_ima_ns(ns);

kmem_cache_free(imans_cachep, ns);
+}
+
+void free_ima_ns(struct user_namespace *user_ns)
+{
+ struct ima_namespace *ns = ima_ns_from_user_ns(user_ns);
+
+ ima_free_ima_ns(ns);

user_ns->ima_ns = NULL;
}
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 151f418036ee..2b8210f0be44 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -471,7 +471,8 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event,
return NOTIFY_DONE;

ns = container_of(nb, struct ima_namespace, ima_lsm_policy_notifier);
- ima_lsm_update_rules(ns);
+ if (ns_is_active(ns))
+ ima_lsm_update_rules(ns);

return NOTIFY_OK;
}
@@ -1334,6 +1335,7 @@ static unsigned int ima_parse_appraise_algos(char *arg)
static int ima_parse_rule(struct ima_namespace *ns,
char *rule, struct ima_rule_entry *entry)
{
+ struct user_namespace *user_ns = ima_ns_to_user_ns(ns);
struct audit_buffer *ab;
char *from;
char *p;
@@ -1583,7 +1585,7 @@ static int ima_parse_rule(struct ima_namespace *ns,

result = kstrtoul(args[0].from, 10, &lnum);
if (!result) {
- entry->uid = make_kuid(current_user_ns(),
+ entry->uid = make_kuid(user_ns,
(uid_t) lnum);
if (!uid_valid(entry->uid) ||
(uid_t)lnum != lnum)
@@ -1618,7 +1620,7 @@ static int ima_parse_rule(struct ima_namespace *ns,

result = kstrtoul(args[0].from, 10, &lnum);
if (!result) {
- entry->gid = make_kgid(current_user_ns(),
+ entry->gid = make_kgid(user_ns,
(gid_t)lnum);
if (!gid_valid(entry->gid) ||
(((gid_t)lnum) != lnum))
@@ -1645,7 +1647,7 @@ static int ima_parse_rule(struct ima_namespace *ns,

result = kstrtoul(args[0].from, 10, &lnum);
if (!result) {
- entry->fowner = make_kuid(current_user_ns(),
+ entry->fowner = make_kuid(user_ns,
(uid_t)lnum);
if (!uid_valid(entry->fowner) ||
(((uid_t)lnum) != lnum))
@@ -1671,7 +1673,7 @@ static int ima_parse_rule(struct ima_namespace *ns,

result = kstrtoul(args[0].from, 10, &lnum);
if (!result) {
- entry->fgroup = make_kgid(current_user_ns(),
+ entry->fgroup = make_kgid(user_ns,
(gid_t)lnum);
if (!gid_valid(entry->fgroup) ||
(((gid_t)lnum) != lnum))
@@ -1925,7 +1927,7 @@ static const char *const mask_tokens[] = {

void *ima_policy_start(struct seq_file *m, loff_t *pos)
{
- struct ima_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(m->file);
loff_t l = *pos;
struct ima_rule_entry *entry;
struct list_head *ima_rules_tmp;
@@ -1944,7 +1946,7 @@ 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_namespace *ns = &init_ima_ns;
+ struct ima_namespace *ns = ima_ns_from_file(m->file);
struct ima_rule_entry *entry = v;

rcu_read_lock();
--
2.31.1