[PATCH] Keys: Export user-defined keyring operations

Export user-defined key operations so that those who wish to define their
own key type based on the user-defined key operations may do so (as has
been requested).

The header file created has been placed into include/keys/user-type.h, thus
creating a directory where other key types may also be placed.  Any
objections to doing this?

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-Off-By: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 71 insertions, 25 deletions

diff --git a/include/keys/user-type.h b/include/keys/user-type.h
new file mode 100644
index 000000000000..26f6ec38577a
--- /dev/null
+++ b/include/keys/user-type.h
@@ -0,0 +1,47 @@
+/* user-type.h: User-defined key type
+ *
+ * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _KEYS_USER_TYPE_H
+#define _KEYS_USER_TYPE_H
+
+#include <linux/key.h>
+#include <linux/rcupdate.h>
+
+/*****************************************************************************/
+/*
+ * the payload for a key of type "user"
+ * - once filled in and attached to a key:
+ *   - the payload struct is invariant may not be changed, only replaced
+ *   - the payload must be read with RCU procedures or with the key semaphore
+ *     held
+ *   - the payload may only be replaced with the key semaphore write-locked
+ * - the key's data length is the size of the actual data, not including the
+ *   payload wrapper
+ */
+struct user_key_payload {
+        struct rcu_head rcu;            /* RCU destructor */
+        unsigned short  datalen;        /* length of this data */
+        char            data[0];        /* actual data */
+};
+
+extern struct key_type key_type_user;
+
+extern int user_instantiate(struct key *key, const void *data, size_t datalen);
+extern int user_duplicate(struct key *key, const struct key *source);
+extern int user_update(struct key *key, const void *data, size_t datalen);
+extern int user_match(const struct key *key, const void *criterion);
+extern void user_destroy(struct key *key);
+extern void user_describe(const struct key *user, struct seq_file *m);
+extern long user_read(const struct key *key,
+                      char __user *buffer, size_t buflen);
+
+
+#endif /* _KEYS_USER_TYPE_H */
diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index e446acba73d3..cbda3b2780a1 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -15,18 +15,10 @@
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 #include <linux/err.h>
+#include <keys/user-type.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
-static int user_instantiate(struct key *key, const void *data, size_t datalen);
-static int user_duplicate(struct key *key, const struct key *source);
-static int user_update(struct key *key, const void *data, size_t datalen);
-static int user_match(const struct key *key, const void *criterion);
-static void user_destroy(struct key *key);
-static void user_describe(const struct key *user, struct seq_file *m);
-static long user_read(const struct key *key,
-                      char __user *buffer, size_t buflen);
-
 /*
  * user defined keys take an arbitrary string as the description and an
  * arbitrary blob of data as the payload
@@ -42,19 +34,13 @@ struct key_type key_type_user = {
         .read           = user_read,
 };
 
-struct user_key_payload {
-        struct rcu_head rcu;            /* RCU destructor */
-        unsigned short  datalen;        /* length of this data */
-        char            data[0];        /* actual data */
-};
-
 EXPORT_SYMBOL_GPL(key_type_user);
 
 /*****************************************************************************/
 /*
  * instantiate a user defined key
  */
-static int user_instantiate(struct key *key, const void *data, size_t datalen)
+int user_instantiate(struct key *key, const void *data, size_t datalen)
 {
         struct user_key_payload *upayload;
         int ret;
@@ -78,18 +64,20 @@ static int user_instantiate(struct key *key, const void *data, size_t datalen)
         rcu_assign_pointer(key->payload.data, upayload);
         ret = 0;
 
- error:
+error:
         return ret;
 
 } /* end user_instantiate() */
 
+EXPORT_SYMBOL_GPL(user_instantiate);
+
 /*****************************************************************************/
 /*
  * duplicate a user defined key
  * - both keys' semaphores are locked against further modification
  * - the new key cannot yet be accessed
  */
-static int user_duplicate(struct key *key, const struct key *source)
+int user_duplicate(struct key *key, const struct key *source)
 {
         struct user_key_payload *upayload, *spayload;
         int ret;
@@ -112,6 +100,8 @@ static int user_duplicate(struct key *key, const struct key *source)
 
 } /* end user_duplicate() */
 
+EXPORT_SYMBOL_GPL(user_duplicate);
+
 /*****************************************************************************/
 /*
  * dispose of the old data from an updated user defined key
@@ -131,7 +121,7 @@ static void user_update_rcu_disposal(struct rcu_head *rcu)
  * update a user defined key
  * - the key's semaphore is write-locked
  */
-static int user_update(struct key *key, const void *data, size_t datalen)
+int user_update(struct key *key, const void *data, size_t datalen)
 {
         struct user_key_payload *upayload, *zap;
         int ret;
@@ -163,26 +153,30 @@ static int user_update(struct key *key, const void *data, size_t datalen)
 
         call_rcu(&zap->rcu, user_update_rcu_disposal);
 
- error:
+error:
         return ret;
 
 } /* end user_update() */
 
+EXPORT_SYMBOL_GPL(user_update);
+
 /*****************************************************************************/
 /*
  * match users on their name
  */
-static int user_match(const struct key *key, const void *description)
+int user_match(const struct key *key, const void *description)
 {
         return strcmp(key->description, description) == 0;
 
 } /* end user_match() */
 
+EXPORT_SYMBOL_GPL(user_match);
+
 /*****************************************************************************/
 /*
  * dispose of the data dangling from the corpse of a user
  */
-static void user_destroy(struct key *key)
+void user_destroy(struct key *key)
 {
         struct user_key_payload *upayload = key->payload.data;
 
@@ -190,11 +184,13 @@ static void user_destroy(struct key *key)
 
 } /* end user_destroy() */
 
+EXPORT_SYMBOL_GPL(user_destroy);
+
 /*****************************************************************************/
 /*
  * describe the user key
  */
-static void user_describe(const struct key *key, struct seq_file *m)
+void user_describe(const struct key *key, struct seq_file *m)
 {
         seq_puts(m, key->description);
 
@@ -202,13 +198,14 @@ static void user_describe(const struct key *key, struct seq_file *m)
 
 } /* end user_describe() */
 
+EXPORT_SYMBOL_GPL(user_describe);
+
 /*****************************************************************************/
 /*
  * read the key data
  * - the key's semaphore is read-locked
  */
-static long user_read(const struct key *key,
-                      char __user *buffer, size_t buflen)
+long user_read(const struct key *key, char __user *buffer, size_t buflen)
 {
         struct user_key_payload *upayload;
         long ret;
@@ -228,3 +225,5 @@ static long user_read(const struct key *key,
         return ret;
 
 } /* end user_read() */
+
+EXPORT_SYMBOL_GPL(user_read);