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Subject[PATCH v8 12/19] userns: Add pointer to ima_namespace to user_namespace
Date
From: Stefan Berger <stefanb@linux.ibm.com>

Add a pointer to ima_namespace to the user_namespace and initialize
the init_user_ns with a pointer to init_ima_ns.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
include/linux/ima.h | 2 ++
include/linux/user_namespace.h | 4 ++++
kernel/user.c | 4 ++++
security/integrity/ima/ima.h | 8 ++++++++
4 files changed, 18 insertions(+)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index fcee2a51bb87..e1d65162d1fb 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -14,6 +14,8 @@
#include <crypto/hash_info.h>
struct linux_binprm;

+extern struct ima_namespace init_ima_ns;
+
#ifdef CONFIG_IMA
extern enum hash_algo ima_get_current_hash_algo(void);
extern int ima_bprm_check(struct linux_binprm *bprm);
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 33a4240e6a6f..019e8cf7b633 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_NS
+ struct ima_namespace *ima_ns;
+#endif
} __randomize_layout;

struct ucounts {
diff --git a/kernel/user.c b/kernel/user.c
index e2cf8c22b539..e5d1f4b9b8ba 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -19,6 +19,7 @@
#include <linux/export.h>
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
+#include <linux/ima.h>

/*
* userns count is 1 for root user, 1 for init_uts_ns,
@@ -67,6 +68,9 @@ 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_NS
+ .ima_ns = &init_ima_ns,
+#endif
};
EXPORT_SYMBOL_GPL(init_user_ns);

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 1c1e859721ee..f63c6f22b853 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -490,6 +490,14 @@ struct user_namespace *ima_user_ns_from_file(const struct file *filp)
return file_inode(filp)->i_sb->s_user_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;
+}
+
static inline struct ima_namespace *get_current_ns(void)
{
return &init_ima_ns;
--
2.31.1
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