[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, 10 insertions, 3 deletions

diff --git a/include/linux/key.h b/include/linux/key.h
index e81ebf910d0b..e693e729bc92 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -248,7 +248,14 @@ extern struct key *key_alloc(struct key_type *type,
                              const char *desc,
                              uid_t uid, gid_t gid,
                              struct task_struct *ctx,
-                             key_perm_t perm, int not_in_quota);
+                             key_perm_t perm,
+                             unsigned long flags);
+
+
+#define KEY_ALLOC_IN_QUOTA      0x0000  /* add to quota, reject if would overrun */
+#define KEY_ALLOC_QUOTA_OVERRUN 0x0001  /* add to quota, permit even if overrun */
+#define KEY_ALLOC_NOT_IN_QUOTA  0x0002  /* not in quota */
+
 extern int key_payload_reserve(struct key *key, size_t datalen);
 extern int key_instantiate_and_link(struct key *key,
                                     const void *data,
@@ -285,7 +292,7 @@ extern key_ref_t key_create_or_update(key_ref_t keyring,
                                       const char *description,
                                       const void *payload,
                                       size_t plen,
-                                      int not_in_quota);
+                                      unsigned long flags);
 
 extern int key_update(key_ref_t key,
                       const void *payload,
@@ -299,7 +306,7 @@ extern int key_unlink(struct key *keyring,
 
 extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
                                  struct task_struct *ctx,
-                                 int not_in_quota,
+                                 unsigned long flags,
                                  struct key *dest);
 
 extern int keyring_clear(struct key *keyring);