[PATCH] keys: sort out key quota system

Add the ability for key creation to overrun the user's quota in some
circumstances - notably when a session keyring is created and assigned to a
process that didn't previously have one.

This means it's still possible to log in, should PAM require the creation of a
new session keyring, and fix an overburdened key quota.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index d2c17bd91a29..51805806f974 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -862,6 +862,7 @@ struct swap_info_struct;
  *      Permit allocation of a key and assign security data. Note that key does
  *      not have a serial number assigned at this point.
  *      @key points to the key.
+ *      @flags is the allocation flags
  *      Return 0 if permission is granted, -ve error otherwise.
  * @key_free:
  *      Notification of destruction; free security data.
@@ -1324,7 +1325,7 @@ struct security_operations {
 
         /* key management security hooks */
 #ifdef CONFIG_KEYS
-        int (*key_alloc)(struct key *key, struct task_struct *tsk);
+        int (*key_alloc)(struct key *key, struct task_struct *tsk, unsigned long flags);
         void (*key_free)(struct key *key);
         int (*key_permission)(key_ref_t key_ref,
                               struct task_struct *context,
@@ -3040,9 +3041,10 @@ static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid
 #ifdef CONFIG_KEYS
 #ifdef CONFIG_SECURITY
 static inline int security_key_alloc(struct key *key,
-                                     struct task_struct *tsk)
+                                     struct task_struct *tsk,
+                                     unsigned long flags)
 {
-        return security_ops->key_alloc(key, tsk);
+        return security_ops->key_alloc(key, tsk, flags);
 }
 
 static inline void security_key_free(struct key *key)
@@ -3060,7 +3062,8 @@ static inline int security_key_permission(key_ref_t key_ref,
 #else
 
 static inline int security_key_alloc(struct key *key,
-                                     struct task_struct *tsk)
+                                     struct task_struct *tsk,
+                                     unsigned long flags)
 {
         return 0;
 }