diff --git a/Documentation/keys-request-key.txt b/Documentation/keys-request-key.txt
index 5f2b9c5edbb..22488d79116 100644
--- a/Documentation/keys-request-key.txt
+++ b/Documentation/keys-request-key.txt
@@ -56,10 +56,12 @@ A request proceeds in the following manner:
  (4) request_key() then forks and executes /sbin/request-key with a new session
      keyring that contains a link to auth key V.
 
- (5) /sbin/request-key execs an appropriate program to perform the actual
+ (5) /sbin/request-key assumes the authority associated with key U.
+
+ (6) /sbin/request-key execs an appropriate program to perform the actual
      instantiation.
 
- (6) The program may want to access another key from A's context (say a
+ (7) The program may want to access another key from A's context (say a
      Kerberos TGT key). It just requests the appropriate key, and the keyring
      search notes that the session keyring has auth key V in its bottom level.
 
@@ -67,19 +69,19 @@ A request proceeds in the following manner:
      UID, GID, groups and security info of process A as if it was process A,
      and come up with key W.
 
- (7) The program then does what it must to get the data with which to
+ (8) The program then does what it must to get the data with which to
      instantiate key U, using key W as a reference (perhaps it contacts a
      Kerberos server using the TGT) and then instantiates key U.
 
- (8) Upon instantiating key U, auth key V is automatically revoked so that it
+ (9) Upon instantiating key U, auth key V is automatically revoked so that it
      may not be used again.
 
- (9) The program then exits 0 and request_key() deletes key V and returns key
+(10) The program then exits 0 and request_key() deletes key V and returns key
      U to the caller.
 
-This also extends further. If key W (step 5 above) didn't exist, key W would be
-created uninstantiated, another auth key (X) would be created [as per step 3]
-and another copy of /sbin/request-key spawned [as per step 4]; but the context
+This also extends further. If key W (step 7 above) didn't exist, key W would be
+created uninstantiated, another auth key (X) would be created (as per step 3)
+and another copy of /sbin/request-key spawned (as per step 4); but the context
 specified by auth key X will still be process A, as it was in auth key V.
 
 This is because process A's keyrings can't simply be attached to
@@ -138,8 +140,8 @@ until one succeeds:
 
  (3) The process's session keyring is searched.
 
- (4) If the process has a request_key() authorisation key in its session
-     keyring then:
+ (4) If the process has assumed the authority associated with a request_key()
+     authorisation key then:
 
      (a) If extant, the calling process's thread keyring is searched.
 
diff --git a/Documentation/keys.txt b/Documentation/keys.txt
index eeda00f82d2..aaa01b0e3ee 100644
--- a/Documentation/keys.txt
+++ b/Documentation/keys.txt
@@ -308,6 +308,8 @@ process making the call:
 	KEY_SPEC_USER_KEYRING		-4	UID-specific keyring
 	KEY_SPEC_USER_SESSION_KEYRING	-5	UID-session keyring
 	KEY_SPEC_GROUP_KEYRING		-6	GID-specific keyring
+	KEY_SPEC_REQKEY_AUTH_KEY	-7	assumed request_key()
+						  authorisation key
 
 
 The main syscalls are:
@@ -645,6 +647,28 @@ The keyctl syscall functions are:
      or expired keys.
 
 
+ (*) Assume the authority granted to instantiate a key
+
+	long keyctl(KEYCTL_ASSUME_AUTHORITY, key_serial_t key);
+
+     This assumes or divests the authority required to instantiate the
+     specified key. Authority can only be assumed if the thread has the
+     authorisation key associated with the specified key in its keyrings
+     somewhere.
+
+     Once authority is assumed, searches for keys will also search the
+     requester's keyrings using the requester's security label, UID, GID and
+     groups.
+
+     If the requested authority is unavailable, error EPERM will be returned,
+     likewise if the authority has been revoked because the target key is
+     already instantiated.
+
+     If the specified key is 0, then any assumed authority will be divested.
+
+     The assumed authorititive key is inherited across fork and exec.
+
+
 ===============
 KERNEL SERVICES
 ===============
diff --git a/include/linux/key.h b/include/linux/key.h
index 4d189e51bc6..cbf464ad958 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -177,6 +177,8 @@ struct key {
 /*
  * kernel managed key type definition
  */
+typedef int (*request_key_actor_t)(struct key *key, struct key *authkey, const char *op);
+
 struct key_type {
 	/* name of the type */
 	const char *name;
@@ -218,6 +220,16 @@ struct key_type {
 	 */
 	long (*read)(const struct key *key, char __user *buffer, size_t buflen);
 
+	/* handle request_key() for this type instead of invoking
+	 * /sbin/request-key (optional)
+	 * - key is the key to instantiate
+	 * - authkey is the authority to assume when instantiating this key
+	 * - op is the operation to be done, usually "create"
+	 * - the call must not return until the instantiation process has run
+	 *   its course
+	 */
+	request_key_actor_t request_key;
+
 	/* internal fields */
 	struct list_head	link;		/* link in types list */
 };
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index ec8f3d622a8..3365945640c 100644
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -19,6 +19,7 @@
 #define KEY_SPEC_USER_KEYRING		-4	/* - key ID for UID-specific keyring */
 #define KEY_SPEC_USER_SESSION_KEYRING	-5	/* - key ID for UID-session keyring */
 #define KEY_SPEC_GROUP_KEYRING		-6	/* - key ID for GID-specific keyring */
+#define KEY_SPEC_REQKEY_AUTH_KEY	-7	/* - key ID for assumed request_key auth key */
 
 /* request-key default keyrings */
 #define KEY_REQKEY_DEFL_NO_CHANGE		-1
@@ -47,5 +48,6 @@
 #define KEYCTL_NEGATE			13	/* negate a partially constructed key */
 #define KEYCTL_SET_REQKEY_KEYRING	14	/* set default request-key keyring */
 #define KEYCTL_SET_TIMEOUT		15	/* set key timeout */
+#define KEYCTL_ASSUME_AUTHORITY		16	/* assume request_key() authorisation */
 
 #endif /*  _LINUX_KEYCTL_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 20bd7074910..78eb92ae4d9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -771,6 +771,7 @@ struct task_struct {
 	unsigned keep_capabilities:1;
 	struct user_struct *user;
 #ifdef CONFIG_KEYS
+	struct key *request_key_auth;	/* assumed request_key authority */
 	struct key *thread_keyring;	/* keyring private to this thread */
 	unsigned char jit_keyring;	/* default keyring to attach requested keys to */
 #endif
diff --git a/security/keys/compat.c b/security/keys/compat.c
index e8e7ef4a290..bcdb2853373 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -77,6 +77,9 @@ asmlinkage long compat_sys_keyctl(u32 option,
 	case KEYCTL_SET_TIMEOUT:
 		return keyctl_set_timeout(arg2, arg3);
 
+	case KEYCTL_ASSUME_AUTHORITY:
+		return keyctl_assume_authority(arg2);
+
 	default:
 		return -EOPNOTSUPP;
 	}
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 51f37c0bdb3..e066e605795 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -107,12 +107,13 @@ extern struct key *request_key_and_link(struct key_type *type,
 struct request_key_auth {
 	struct key		*target_key;
 	struct task_struct	*context;
+	const char		*callout_info;
 	pid_t			pid;
 };
 
 extern struct key_type key_type_request_key_auth;
 extern struct key *request_key_auth_new(struct key *target,
-					struct key **_rkakey);
+					const char *callout_info);
 
 extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
 
@@ -137,6 +138,7 @@ extern long keyctl_instantiate_key(key_serial_t, const void __user *,
 extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
 extern long keyctl_set_reqkey_keyring(int);
 extern long keyctl_set_timeout(key_serial_t, unsigned);
+extern long keyctl_assume_authority(key_serial_t);
 
 
 /*
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 299f0ae11cf..3d2ebae029c 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -834,6 +834,17 @@ long keyctl_instantiate_key(key_serial_t id,
 	if (plen > 32767)
 		goto error;
 
+	/* the appropriate instantiation authorisation key must have been
+	 * assumed before calling this */
+	ret = -EPERM;
+	instkey = current->request_key_auth;
+	if (!instkey)
+		goto error;
+
+	rka = instkey->payload.data;
+	if (rka->target_key->serial != id)
+		goto error;
+
 	/* pull the payload in if one was supplied */
 	payload = NULL;
 
@@ -848,15 +859,6 @@ long keyctl_instantiate_key(key_serial_t id,
 			goto error2;
 	}
 
-	/* find the instantiation authorisation key */
-	instkey = key_get_instantiation_authkey(id);
-	if (IS_ERR(instkey)) {
-		ret = PTR_ERR(instkey);
-		goto error2;
-	}
-
-	rka = instkey->payload.data;
-
 	/* find the destination keyring amongst those belonging to the
 	 * requesting task */
 	keyring_ref = NULL;
@@ -865,7 +867,7 @@ long keyctl_instantiate_key(key_serial_t id,
 					      KEY_WRITE);
 		if (IS_ERR(keyring_ref)) {
 			ret = PTR_ERR(keyring_ref);
-			goto error3;
+			goto error2;
 		}
 	}
 
@@ -874,11 +876,17 @@ long keyctl_instantiate_key(key_serial_t id,
 				       key_ref_to_ptr(keyring_ref), instkey);
 
 	key_ref_put(keyring_ref);
- error3:
-	key_put(instkey);
- error2:
+
+	/* discard the assumed authority if it's just been disabled by
+	 * instantiation of the key */
+	if (ret == 0) {
+		key_put(current->request_key_auth);
+		current->request_key_auth = NULL;
+	}
+
+error2:
 	kfree(payload);
- error:
+error:
 	return ret;
 
 } /* end keyctl_instantiate_key() */
@@ -895,14 +903,16 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
 	key_ref_t keyring_ref;
 	long ret;
 
-	/* find the instantiation authorisation key */
-	instkey = key_get_instantiation_authkey(id);
-	if (IS_ERR(instkey)) {
-		ret = PTR_ERR(instkey);
+	/* the appropriate instantiation authorisation key must have been
+	 * assumed before calling this */
+	ret = -EPERM;
+	instkey = current->request_key_auth;
+	if (!instkey)
 		goto error;
-	}
 
 	rka = instkey->payload.data;
+	if (rka->target_key->serial != id)
+		goto error;
 
 	/* find the destination keyring if present (which must also be
 	 * writable) */
@@ -911,7 +921,7 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
 		keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
 		if (IS_ERR(keyring_ref)) {
 			ret = PTR_ERR(keyring_ref);
-			goto error2;
+			goto error;
 		}
 	}
 
@@ -920,9 +930,15 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
 				  key_ref_to_ptr(keyring_ref), instkey);
 
 	key_ref_put(keyring_ref);
- error2:
-	key_put(instkey);
- error:
+
+	/* discard the assumed authority if it's just been disabled by
+	 * instantiation of the key */
+	if (ret == 0) {
+		key_put(current->request_key_auth);
+		current->request_key_auth = NULL;
+	}
+
+error:
 	return ret;
 
 } /* end keyctl_negate_key() */
@@ -1005,6 +1021,48 @@ error:
 
 } /* end keyctl_set_timeout() */
 
+/*****************************************************************************/
+/*
+ * assume the authority to instantiate the specified key
+ */
+long keyctl_assume_authority(key_serial_t id)
+{
+	struct key *authkey;
+	long ret;
+
+	/* special key IDs aren't permitted */
+	ret = -EINVAL;
+	if (id < 0)
+		goto error;
+
+	/* we divest ourselves of authority if given an ID of 0 */
+	if (id == 0) {
+		key_put(current->request_key_auth);
+		current->request_key_auth = NULL;
+		ret = 0;
+		goto error;
+	}
+
+	/* attempt to assume the authority temporarily granted to us whilst we
+	 * instantiate the specified key
+	 * - the authorisation key must be in the current task's keyrings
+	 *   somewhere
+	 */
+	authkey = key_get_instantiation_authkey(id);
+	if (IS_ERR(authkey)) {
+		ret = PTR_ERR(authkey);
+		goto error;
+	}
+
+	key_put(current->request_key_auth);
+	current->request_key_auth = authkey;
+	ret = authkey->serial;
+
+error:
+	return ret;
+
+} /* end keyctl_assume_authority() */
+
 /*****************************************************************************/
 /*
  * the key control system call
@@ -1082,6 +1140,9 @@ asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
 		return keyctl_set_timeout((key_serial_t) arg2,
 					  (unsigned) arg3);
 
+	case KEYCTL_ASSUME_AUTHORITY:
+		return keyctl_assume_authority((key_serial_t) arg2);
+
 	default:
 		return -EOPNOTSUPP;
 	}
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 09d92d52ef7..d65a180f888 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -479,51 +479,6 @@ key_ref_t __keyring_search_one(key_ref_t keyring_ref,
 
 } /* end __keyring_search_one() */
 
-/*****************************************************************************/
-/*
- * search for an instantiation authorisation key matching a target key
- * - the RCU read lock must be held by the caller
- * - a target_id of zero specifies any valid token
- */
-struct key *keyring_search_instkey(struct key *keyring,
-				   key_serial_t target_id)
-{
-	struct request_key_auth *rka;
-	struct keyring_list *klist;
-	struct key *instkey;
-	int loop;
-
-	klist = rcu_dereference(keyring->payload.subscriptions);
-	if (klist) {
-		for (loop = 0; loop < klist->nkeys; loop++) {
-			instkey = klist->keys[loop];
-
-			if (instkey->type != &key_type_request_key_auth)
-				continue;
-
-			rka = instkey->payload.data;
-			if (target_id && rka->target_key->serial != target_id)
-				continue;
-
-			/* the auth key is revoked during instantiation */
-			if (!test_bit(KEY_FLAG_REVOKED, &instkey->flags))
-				goto found;
-
-			instkey = ERR_PTR(-EKEYREVOKED);
-			goto error;
-		}
-	}
-
-	instkey = ERR_PTR(-EACCES);
-	goto error;
-
-found:
-	atomic_inc(&instkey->usage);
-error:
-	return instkey;
-
-} /* end keyring_search_instkey() */
-
 /*****************************************************************************/
 /*
  * find a keyring with the specified name
diff --git a/security/keys/permission.c b/security/keys/permission.c
index e7f579c0eaf..3b41f9b5253 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -73,3 +73,35 @@ use_these_perms:
 } /* end key_task_permission() */
 
 EXPORT_SYMBOL(key_task_permission);
+
+/*****************************************************************************/
+/*
+ * validate a key
+ */
+int key_validate(struct key *key)
+{
+	struct timespec now;
+	int ret = 0;
+
+	if (key) {
+		/* check it's still accessible */
+		ret = -EKEYREVOKED;
+		if (test_bit(KEY_FLAG_REVOKED, &key->flags) ||
+		    test_bit(KEY_FLAG_DEAD, &key->flags))
+			goto error;
+
+		/* check it hasn't expired */
+		ret = 0;
+		if (key->expiry) {
+			now = current_kernel_time();
+			if (now.tv_sec >= key->expiry)
+				ret = -EKEYEXPIRED;
+		}
+	}
+
+ error:
+	return ret;
+
+} /* end key_validate() */
+
+EXPORT_SYMBOL(key_validate);
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 566b1cc0118..74cb79eb917 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -270,9 +270,14 @@ int copy_thread_group_keys(struct task_struct *tsk)
 int copy_keys(unsigned long clone_flags, struct task_struct *tsk)
 {
 	key_check(tsk->thread_keyring);
+	key_check(tsk->request_key_auth);
 
 	/* no thread keyring yet */
 	tsk->thread_keyring = NULL;
+
+	/* copy the request_key() authorisation for this thread */
+	key_get(tsk->request_key_auth);
+
 	return 0;
 
 } /* end copy_keys() */
@@ -290,11 +295,12 @@ void exit_thread_group_keys(struct signal_struct *tg)
 
 /*****************************************************************************/
 /*
- * dispose of keys upon thread exit
+ * dispose of per-thread keys upon thread exit
  */
 void exit_keys(struct task_struct *tsk)
 {
 	key_put(tsk->thread_keyring);
+	key_put(tsk->request_key_auth);
 
 } /* end exit_keys() */
 
@@ -382,7 +388,7 @@ key_ref_t search_process_keyrings(struct key_type *type,
 				  struct task_struct *context)
 {
 	struct request_key_auth *rka;
-	key_ref_t key_ref, ret, err, instkey_ref;
+	key_ref_t key_ref, ret, err;
 
 	/* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
 	 * searchable, but we failed to find a key or we found a negative key;
@@ -461,44 +467,6 @@ key_ref_t search_process_keyrings(struct key_type *type,
 			err = key_ref;
 			break;
 		}
-
-		/* if this process has a session keyring and that has an
-		 * instantiation authorisation key in the bottom level, then we
-		 * also search the keyrings of the process mentioned there */
-		if (context != current)
-			goto no_key;
-
-		rcu_read_lock();
-		instkey_ref = __keyring_search_one(
-			make_key_ref(rcu_dereference(
-					     context->signal->session_keyring),
-				     1),
-			&key_type_request_key_auth, NULL, 0);
-		rcu_read_unlock();
-
-		if (IS_ERR(instkey_ref))
-			goto no_key;
-
-		rka = key_ref_to_ptr(instkey_ref)->payload.data;
-
-		key_ref = search_process_keyrings(type, description, match,
-						  rka->context);
-		key_ref_put(instkey_ref);
-
-		if (!IS_ERR(key_ref))
-			goto found;
-
-		switch (PTR_ERR(key_ref)) {
-		case -EAGAIN: /* no key */
-			if (ret)
-				break;
-		case -ENOKEY: /* negative key */
-			ret = key_ref;
-			break;
-		default:
-			err = key_ref;
-			break;
-		}
 	}
 	/* or search the user-session keyring */
 	else {
@@ -521,8 +489,36 @@ key_ref_t search_process_keyrings(struct key_type *type,
 		}
 	}
 
+	/* if this process has an instantiation authorisation key, then we also
+	 * search the keyrings of the process mentioned there
+	 * - we don't permit access to request_key auth keys via this method
+	 */
+	if (context->request_key_auth &&
+	    context == current &&
+	    type != &key_type_request_key_auth &&
+	    key_validate(context->request_key_auth) == 0
+	    ) {
+		rka = context->request_key_auth->payload.data;
+
+		key_ref = search_process_keyrings(type, description, match,
+						  rka->context);
+
+		if (!IS_ERR(key_ref))
+			goto found;
+
+		switch (PTR_ERR(key_ref)) {
+		case -EAGAIN: /* no key */
+			if (ret)
+				break;
+		case -ENOKEY: /* negative key */
+			ret = key_ref;
+			break;
+		default:
+			err = key_ref;
+			break;
+		}
+	}
 
-no_key:
 	/* no key - decide on the error we're going to go for */
 	key_ref = ret ? ret : err;
 
@@ -628,6 +624,15 @@ key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
 		key = ERR_PTR(-EINVAL);
 		goto error;
 
+	case KEY_SPEC_REQKEY_AUTH_KEY:
+		key = context->request_key_auth;
+		if (!key)
+			goto error;
+
+		atomic_inc(&key->usage);
+		key_ref = make_key_ref(key, 1);
+		break;
+
 	default:
 		key_ref = ERR_PTR(-EINVAL);
 		if (id < 1)
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 5cc4bba70db..f030a0ccbb9 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -29,28 +29,36 @@ DECLARE_WAIT_QUEUE_HEAD(request_key_conswq);
 /*****************************************************************************/
 /*
  * request userspace finish the construction of a key
- * - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring> <info>"
+ * - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
  */
-static int call_request_key(struct key *key,
-			    const char *op,
-			    const char *callout_info)
+static int call_sbin_request_key(struct key *key,
+				 struct key *authkey,
+				 const char *op)
 {
 	struct task_struct *tsk = current;
 	key_serial_t prkey, sskey;
-	struct key *session_keyring, *rkakey;
-	char *argv[10], *envp[3], uid_str[12], gid_str[12];
+	struct key *keyring;
+	char *argv[9], *envp[3], uid_str[12], gid_str[12];
 	char key_str[12], keyring_str[3][12];
+	char desc[20];
 	int ret, i;
 
-	kenter("{%d},%s,%s", key->serial, op, callout_info);
+	kenter("{%d},{%d},%s", key->serial, authkey->serial, op);
 
-	/* generate a new session keyring with an auth key in it */
-	session_keyring = request_key_auth_new(key, &rkakey);
-	if (IS_ERR(session_keyring)) {
-		ret = PTR_ERR(session_keyring);
-		goto error;
+	/* allocate a new session keyring */
+	sprintf(desc, "_req.%u", key->serial);
+
+	keyring = keyring_alloc(desc, current->fsuid, current->fsgid, 1, NULL);
+	if (IS_ERR(keyring)) {
+		ret = PTR_ERR(keyring);
+		goto error_alloc;
 	}
 
+	/* attach the auth key to the session keyring */
+	ret = __key_link(keyring, authkey);
+	if (ret < 0)
+		goto error_link;
+
 	/* record the UID and GID */
 	sprintf(uid_str, "%d", current->fsuid);
 	sprintf(gid_str, "%d", current->fsgid);
@@ -95,22 +103,19 @@ static int call_request_key(struct key *key,
 	argv[i++] = keyring_str[0];
 	argv[i++] = keyring_str[1];
 	argv[i++] = keyring_str[2];
-	argv[i++] = (char *) callout_info;
 	argv[i] = NULL;
 
 	/* do it */
-	ret = call_usermodehelper_keys(argv[0], argv, envp, session_keyring, 1);
+	ret = call_usermodehelper_keys(argv[0], argv, envp, keyring, 1);
 
-	/* dispose of the special keys */
-	key_revoke(rkakey);
-	key_put(rkakey);
-	key_put(session_keyring);
+error_link:
+	key_put(keyring);
 
- error:
+error_alloc:
 	kleave(" = %d", ret);
 	return ret;
 
-} /* end call_request_key() */
+} /* end call_sbin_request_key() */
 
 /*****************************************************************************/
 /*
@@ -122,9 +127,10 @@ static struct key *__request_key_construction(struct key_type *type,
 					      const char *description,
 					      const char *callout_info)
 {
+	request_key_actor_t actor;
 	struct key_construction cons;
 	struct timespec now;
-	struct key *key;
+	struct key *key, *authkey;
 	int ret, negated;
 
 	kenter("%s,%s,%s", type->name, description, callout_info);
@@ -143,8 +149,19 @@ static struct key *__request_key_construction(struct key_type *type,
 	/* we drop the construction sem here on behalf of the caller */
 	up_write(&key_construction_sem);
 
+	/* allocate an authorisation key */
+	authkey = request_key_auth_new(key, callout_info);
+	if (IS_ERR(authkey)) {
+		ret = PTR_ERR(authkey);
+		authkey = NULL;
+		goto alloc_authkey_failed;
+	}
+
 	/* make the call */
-	ret = call_request_key(key, "create", callout_info);
+	actor = call_sbin_request_key;
+	if (type->request_key)
+		actor = type->request_key;
+	ret = actor(key, authkey, "create");
 	if (ret < 0)
 		goto request_failed;
 
@@ -153,22 +170,29 @@ static struct key *__request_key_construction(struct key_type *type,
 	if (!test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
 		goto request_failed;
 
+	key_revoke(authkey);
+	key_put(authkey);
+
 	down_write(&key_construction_sem);
 	list_del(&cons.link);
 	up_write(&key_construction_sem);
 
 	/* also give an error if the key was negatively instantiated */
- check_not_negative:
+check_not_negative:
 	if (test_bit(KEY_FLAG_NEGATIVE, &key->flags)) {
 		key_put(key);
 		key = ERR_PTR(-ENOKEY);
 	}
 
- out:
+out:
 	kleave(" = %p", key);
 	return key;
 
- request_failed:
+request_failed:
+	key_revoke(authkey);
+	key_put(authkey);
+
+alloc_authkey_failed:
 	/* it wasn't instantiated
 	 * - remove from construction queue
 	 * - mark the key as dead
@@ -217,7 +241,7 @@ static struct key *__request_key_construction(struct key_type *type,
 	key = ERR_PTR(ret);
 	goto out;
 
- alloc_failed:
+alloc_failed:
 	up_write(&key_construction_sem);
 	goto out;
 
@@ -464,35 +488,3 @@ struct key *request_key(struct key_type *type,
 } /* end request_key() */
 
 EXPORT_SYMBOL(request_key);
-
-/*****************************************************************************/
-/*
- * validate a key
- */
-int key_validate(struct key *key)
-{
-	struct timespec now;
-	int ret = 0;
-
-	if (key) {
-		/* check it's still accessible */
-		ret = -EKEYREVOKED;
-		if (test_bit(KEY_FLAG_REVOKED, &key->flags) ||
-		    test_bit(KEY_FLAG_DEAD, &key->flags))
-			goto error;
-
-		/* check it hasn't expired */
-		ret = 0;
-		if (key->expiry) {
-			now = current_kernel_time();
-			if (now.tv_sec >= key->expiry)
-				ret = -EKEYEXPIRED;
-		}
-	}
-
- error:
-	return ret;
-
-} /* end key_validate() */
-
-EXPORT_SYMBOL(key_validate);
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index a8e4069d48c..cce6ba6b032 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -15,11 +15,13 @@
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <linux/seq_file.h>
+#include <asm/uaccess.h>
 #include "internal.h"
 
 static int request_key_auth_instantiate(struct key *, const void *, size_t);
 static void request_key_auth_describe(const struct key *, struct seq_file *);
 static void request_key_auth_destroy(struct key *);
+static long request_key_auth_read(const struct key *, char __user *, size_t);
 
 /*
  * the request-key authorisation key type definition
@@ -30,51 +32,25 @@ struct key_type key_type_request_key_auth = {
 	.instantiate	= request_key_auth_instantiate,
 	.describe	= request_key_auth_describe,
 	.destroy	= request_key_auth_destroy,
+	.read		= request_key_auth_read,
 };
 
 /*****************************************************************************/
 /*
- * instantiate a request-key authorisation record
+ * instantiate a request-key authorisation key
  */
 static int request_key_auth_instantiate(struct key *key,
 					const void *data,
 					size_t datalen)
 {
-	struct request_key_auth *rka, *irka;
-	struct key *instkey;
-	int ret;
-
-	ret = -ENOMEM;
-	rka = kmalloc(sizeof(*rka), GFP_KERNEL);
-	if (rka) {
-		/* see if the calling process is already servicing the key
-		 * request of another process */
-		instkey = key_get_instantiation_authkey(0);
-		if (!IS_ERR(instkey)) {
-			/* it is - use that instantiation context here too */
-			irka = instkey->payload.data;
-			rka->context = irka->context;
-			rka->pid = irka->pid;
-			key_put(instkey);
-		}
-		else {
-			/* it isn't - use this process as the context */
-			rka->context = current;
-			rka->pid = current->pid;
-		}
-
-		rka->target_key = key_get((struct key *) data);
-		key->payload.data = rka;
-		ret = 0;
-	}
-
-	return ret;
+	key->payload.data = (struct request_key_auth *) data;
+	return 0;
 
 } /* end request_key_auth_instantiate() */
 
 /*****************************************************************************/
 /*
- *
+ * reading a request-key authorisation key retrieves the callout information
  */
 static void request_key_auth_describe(const struct key *key,
 				      struct seq_file *m)
@@ -83,10 +59,38 @@ static void request_key_auth_describe(const struct key *key,
 
 	seq_puts(m, "key:");
 	seq_puts(m, key->description);
-	seq_printf(m, " pid:%d", rka->pid);
+	seq_printf(m, " pid:%d ci:%zu", rka->pid, strlen(rka->callout_info));
 
 } /* end request_key_auth_describe() */
 
+/*****************************************************************************/
+/*
+ * read the callout_info data
+ * - the key's semaphore is read-locked
+ */
+static long request_key_auth_read(const struct key *key,
+				  char __user *buffer, size_t buflen)
+{
+	struct request_key_auth *rka = key->payload.data;
+	size_t datalen;
+	long ret;
+
+	datalen = strlen(rka->callout_info);
+	ret = datalen;
+
+	/* we can return the data as is */
+	if (buffer && buflen > 0) {
+		if (buflen > datalen)
+			buflen = datalen;
+
+		if (copy_to_user(buffer, rka->callout_info, buflen) != 0)
+			ret = -EFAULT;
+	}
+
+	return ret;
+
+} /* end request_key_auth_read() */
+
 /*****************************************************************************/
 /*
  * destroy an instantiation authorisation token key
@@ -104,54 +108,87 @@ static void request_key_auth_destroy(struct key *key)
 
 /*****************************************************************************/
 /*
- * create a session keyring to be for the invokation of /sbin/request-key and
- * stick an authorisation token in it
+ * create an authorisation token for /sbin/request-key or whoever to gain
+ * access to the caller's security data
  */
-struct key *request_key_auth_new(struct key *target, struct key **_rkakey)
+struct key *request_key_auth_new(struct key *target, const char *callout_info)
 {
-	struct key *keyring, *rkakey = NULL;
+	struct request_key_auth *rka, *irka;
+	struct key *authkey = NULL;
 	char desc[20];
 	int ret;
 
 	kenter("%d,", target->serial);
 
-	/* allocate a new session keyring */
-	sprintf(desc, "_req.%u", target->serial);
-
-	keyring = keyring_alloc(desc, current->fsuid, current->fsgid, 1, NULL);
-	if (IS_ERR(keyring)) {
-		kleave("= %ld", PTR_ERR(keyring));
-		return keyring;
+	/* allocate a auth record */
+	rka = kmalloc(sizeof(*rka), GFP_KERNEL);
+	if (!rka) {
+		kleave(" = -ENOMEM");
+		return ERR_PTR(-ENOMEM);
 	}
 
+	/* see if the calling process is already servicing the key request of
+	 * another process */
+	if (current->request_key_auth) {
+		/* it is - use that instantiation context here too */
+		irka = current->request_key_auth->payload.data;
+		rka->context = irka->context;
+		rka->pid = irka->pid;
+	}
+	else {
+		/* it isn't - use this process as the context */
+		rka->context = current;
+		rka->pid = current->pid;
+	}
+
+	rka->target_key = key_get(target);
+	rka->callout_info = callout_info;
+
 	/* allocate the auth key */
 	sprintf(desc, "%x", target->serial);
 
-	rkakey = key_alloc(&key_type_request_key_auth, desc,
-			   current->fsuid, current->fsgid,
-			   KEY_POS_VIEW | KEY_USR_VIEW, 1);
-	if (IS_ERR(rkakey)) {
-		key_put(keyring);
-		kleave("= %ld", PTR_ERR(rkakey));
-		return rkakey;
+	authkey = key_alloc(&key_type_request_key_auth, desc,
+			    current->fsuid, current->fsgid,
+			    KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
+			    KEY_USR_VIEW, 1);
+	if (IS_ERR(authkey)) {
+		ret = PTR_ERR(authkey);
+		goto error_alloc;
 	}
 
 	/* construct and attach to the keyring */
-	ret = key_instantiate_and_link(rkakey, target, 0, keyring, NULL);
-	if (ret < 0) {
-		key_revoke(rkakey);
-		key_put(rkakey);
-		key_put(keyring);
-		kleave("= %d", ret);
-		return ERR_PTR(ret);
-	}
+	ret = key_instantiate_and_link(authkey, rka, 0, NULL, NULL);
+	if (ret < 0)
+		goto error_inst;
 
-	*_rkakey = rkakey;
-	kleave(" = {%d} ({%d})", keyring->serial, rkakey->serial);
-	return keyring;
+	kleave(" = {%d})", authkey->serial);
+	return authkey;
+
+error_inst:
+	key_revoke(authkey);
+	key_put(authkey);
+error_alloc:
+	key_put(rka->target_key);
+	kfree(rka);
+	kleave("= %d", ret);
+	return ERR_PTR(ret);
 
 } /* end request_key_auth_new() */
 
+/*****************************************************************************/
+/*
+ * see if an authorisation key is associated with a particular key
+ */
+static int key_get_instantiation_authkey_match(const struct key *key,
+					       const void *_id)
+{
+	struct request_key_auth *rka = key->payload.data;
+	key_serial_t id = (key_serial_t)(unsigned long) _id;
+
+	return rka->target_key->serial == id;
+
+} /* end key_get_instantiation_authkey_match() */
+
 /*****************************************************************************/
 /*
  * get the authorisation key for instantiation of a specific key if attached to
@@ -162,22 +199,27 @@ struct key *request_key_auth_new(struct key *target, struct key **_rkakey)
  */
 struct key *key_get_instantiation_authkey(key_serial_t target_id)
 {
-	struct task_struct *tsk = current;
-	struct key *instkey;
+	struct key *authkey;
+	key_ref_t authkey_ref;
 
-	/* we must have our own personal session keyring */
-	if (!tsk->signal->session_keyring)
-		return ERR_PTR(-EACCES);
+	authkey_ref = search_process_keyrings(
+		&key_type_request_key_auth,
+		(void *) (unsigned long) target_id,
+		key_get_instantiation_authkey_match,
+		current);
 
-	/* and it must contain a suitable request authorisation key
-	 * - lock RCU against session keyring changing
-	 */
-	rcu_read_lock();
+	if (IS_ERR(authkey_ref)) {
+		authkey = ERR_PTR(PTR_ERR(authkey_ref));
+		goto error;
+	}
 
-	instkey = keyring_search_instkey(
-		rcu_dereference(tsk->signal->session_keyring), target_id);
+	authkey = key_ref_to_ptr(authkey_ref);
+	if (test_bit(KEY_FLAG_REVOKED, &authkey->flags)) {
+		key_put(authkey);
+		authkey = ERR_PTR(-EKEYREVOKED);
+	}
 
-	rcu_read_unlock();
-	return instkey;
+error:
+	return authkey;
 
 } /* end key_get_instantiation_authkey() */