1 files changed, 21 insertions, 2 deletions

diff --git a/include/linux/key.h b/include/linux/key.h
index cd50dfa1d4c2..6ea4eebd3467 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -9,7 +9,7 @@
  * 2 of the License, or (at your option) any later version.
  *
  *
- * See Documentation/keys.txt for information on keys/keyrings.
+ * See Documentation/security/keys.txt for information on keys/keyrings.
  */
 
 #ifndef _LINUX_KEY_H
@@ -170,6 +170,7 @@ struct key {
                 struct list_head        link;
                 unsigned long           x[2];
                 void                    *p[2];
+                int                     reject_error;
         } type_data;
 
         /* key data
@@ -178,8 +179,9 @@ struct key {
          */
         union {
                 unsigned long           value;
+                void __rcu              *rcudata;
                 void                    *data;
-                struct keyring_list     *subscriptions;
+                struct keyring_list __rcu *subscriptions;
         } payload;
 };
 
@@ -274,6 +276,23 @@ static inline key_serial_t key_serial(struct key *key)
         return key ? key->serial : 0;
 }
 
+/**
+ * key_is_instantiated - Determine if a key has been positively instantiated
+ * @key: The key to check.
+ *
+ * Return true if the specified key has been positively instantiated, false
+ * otherwise.
+ */
+static inline bool key_is_instantiated(const struct key *key)
+{
+        return test_bit(KEY_FLAG_INSTANTIATED, &key->flags) &&
+                !test_bit(KEY_FLAG_NEGATIVE, &key->flags);
+}
+
+#define rcu_dereference_key(KEY)                                        \
+        (rcu_dereference_protected((KEY)->payload.rcudata,              \
+                                   rwsem_is_locked(&((struct key *)(KEY))->sem)))
+
 #ifdef CONFIG_SYSCTL
 extern ctl_table key_sysctls[];
 #endif