diff --git a/Documentation/keys.txt b/Documentation/keys.txt
index 3df40c1..0321ded 100644
--- a/Documentation/keys.txt
+++ b/Documentation/keys.txt
@@ -591,6 +591,37 @@
      this case too.
 
 
+ (*) Set the default request-key destination keyring.
+
+	long keyctl(KEYCTL_SET_REQKEY_KEYRING, int reqkey_defl);
+
+     This sets the default keyring to which implicitly requested keys will be
+     attached for this thread. reqkey_defl should be one of these constants:
+
+	CONSTANT				VALUE	NEW DEFAULT KEYRING
+	======================================	======	=======================
+	KEY_REQKEY_DEFL_NO_CHANGE		-1	No change
+	KEY_REQKEY_DEFL_DEFAULT			0	Default[1]
+	KEY_REQKEY_DEFL_THREAD_KEYRING		1	Thread keyring
+	KEY_REQKEY_DEFL_PROCESS_KEYRING		2	Process keyring
+	KEY_REQKEY_DEFL_SESSION_KEYRING		3	Session keyring
+	KEY_REQKEY_DEFL_USER_KEYRING		4	User keyring
+	KEY_REQKEY_DEFL_USER_SESSION_KEYRING	5	User session keyring
+	KEY_REQKEY_DEFL_GROUP_KEYRING		6	Group keyring
+
+     The old default will be returned if successful and error EINVAL will be
+     returned if reqkey_defl is not one of the above values.
+
+     The default keyring can be overridden by the keyring indicated to the
+     request_key() system call.
+
+     Note that this setting is inherited across fork/exec.
+
+     [1] The default default is: the thread keyring if there is one, otherwise
+     the process keyring if there is one, otherwise the session keyring if
+     there is one, otherwise the user default session keyring.
+
+
 ===============
 KERNEL SERVICES
 ===============
@@ -626,6 +657,9 @@
     Should the function fail error ENOKEY, EKEYEXPIRED or EKEYREVOKED will be
     returned.
 
+    If successful, the key will have been attached to the default keyring for
+    implicitly obtained request-key keys, as set by KEYCTL_SET_REQKEY_KEYRING.
+
 
 (*) When it is no longer required, the key should be released using:
 
diff --git a/include/linux/key-ui.h b/include/linux/key-ui.h
index 159ca8d..cc32617 100644
--- a/include/linux/key-ui.h
+++ b/include/linux/key-ui.h
@@ -1,4 +1,4 @@
-/* key-ui.h: key userspace interface stuff for use by keyfs
+/* key-ui.h: key userspace interface stuff
  *
  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
@@ -84,8 +84,45 @@
 	return kperm != 0;
 }
 
+static inline int key_task_groups_search(struct task_struct *tsk, gid_t gid)
+{
+	int ret;
 
-extern struct key *lookup_user_key(key_serial_t id, int create, int part,
+	task_lock(tsk);
+	ret = groups_search(tsk->group_info, gid);
+	task_unlock(tsk);
+	return ret;
+}
+
+static inline int key_task_permission(const struct key *key,
+				      struct task_struct *context,
+				      key_perm_t perm)
+{
+	key_perm_t kperm;
+
+	if (key->uid == context->fsuid) {
+		kperm = key->perm >> 16;
+	}
+	else if (key->gid != -1 &&
+		 key->perm & KEY_GRP_ALL && (
+			 key->gid == context->fsgid ||
+			 key_task_groups_search(context, key->gid)
+			 )
+		 ) {
+		kperm = key->perm >> 8;
+	}
+	else {
+		kperm = key->perm;
+	}
+
+	kperm = kperm & perm & KEY_ALL;
+
+	return kperm == perm;
+
+}
+
+extern struct key *lookup_user_key(struct task_struct *context,
+				   key_serial_t id, int create, int partial,
 				   key_perm_t perm);
 
 extern long join_session_keyring(const char *name);
diff --git a/include/linux/key.h b/include/linux/key.h
index 2bfbf88..970bbd9 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -199,10 +199,12 @@
 extern int key_instantiate_and_link(struct key *key,
 				    const void *data,
 				    size_t datalen,
-				    struct key *keyring);
+				    struct key *keyring,
+				    struct key *instkey);
 extern int key_negate_and_link(struct key *key,
 			       unsigned timeout,
-			       struct key *keyring);
+			       struct key *keyring,
+			       struct key *instkey);
 extern void key_revoke(struct key *key);
 extern void key_put(struct key *key);
 
@@ -245,9 +247,6 @@
 				  struct key_type *type,
 				  const char *description);
 
-extern struct key *search_process_keyrings(struct key_type *type,
-					   const char *description);
-
 extern int keyring_add_key(struct key *keyring,
 			   struct key *key);
 
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index 381dedc..8d7c59a 100644
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -20,6 +20,16 @@
 #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 */
 
+/* request-key default keyrings */
+#define KEY_REQKEY_DEFL_NO_CHANGE		-1
+#define KEY_REQKEY_DEFL_DEFAULT			0
+#define KEY_REQKEY_DEFL_THREAD_KEYRING		1
+#define KEY_REQKEY_DEFL_PROCESS_KEYRING		2
+#define KEY_REQKEY_DEFL_SESSION_KEYRING		3
+#define KEY_REQKEY_DEFL_USER_KEYRING		4
+#define KEY_REQKEY_DEFL_USER_SESSION_KEYRING	5
+#define KEY_REQKEY_DEFL_GROUP_KEYRING		6
+
 /* keyctl commands */
 #define KEYCTL_GET_KEYRING_ID		0	/* ask for a keyring's ID */
 #define KEYCTL_JOIN_SESSION_KEYRING	1	/* join or start named session keyring */
@@ -35,5 +45,6 @@
 #define KEYCTL_READ			11	/* read a key or keyring's contents */
 #define KEYCTL_INSTANTIATE		12	/* instantiate a partially constructed key */
 #define KEYCTL_NEGATE			13	/* negate a partially constructed key */
+#define KEYCTL_SET_REQKEY_KEYRING	14	/* set default request-key keyring */
 
 #endif /*  _LINUX_KEYCTL_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 901742f..2c69682 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -561,9 +561,10 @@
 		groups_free(group_info); \
 } while (0)
 
-struct group_info *groups_alloc(int gidsetsize);
-void groups_free(struct group_info *group_info);
-int set_current_groups(struct group_info *group_info);
+extern struct group_info *groups_alloc(int gidsetsize);
+extern void groups_free(struct group_info *group_info);
+extern int set_current_groups(struct group_info *group_info);
+extern int groups_search(struct group_info *group_info, gid_t grp);
 /* access the groups "array" with this macro */
 #define GROUP_AT(gi, i) \
     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
@@ -660,6 +661,7 @@
 	struct user_struct *user;
 #ifdef CONFIG_KEYS
 	struct key *thread_keyring;	/* keyring private to this thread */
+	unsigned char jit_keyring;	/* default keyring to attach requested keys to */
 #endif
 	int oomkilladj; /* OOM kill score adjustment (bit shift). */
 	char comm[TASK_COMM_LEN]; /* executable name excluding path
diff --git a/kernel/sys.c b/kernel/sys.c
index 5a9d6b0..da24bc1 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1259,7 +1259,7 @@
 }
 
 /* a simple bsearch */
-static int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(struct group_info *group_info, gid_t grp)
 {
 	int left, right;
 
diff --git a/security/keys/Makefile b/security/keys/Makefile
index ddb495d6..c392d75 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -7,8 +7,9 @@
 	keyring.o \
 	keyctl.o \
 	process_keys.o \
-	user_defined.o \
-	request_key.o
+	request_key.o \
+	request_key_auth.o \
+	user_defined.o
 
 obj-$(CONFIG_KEYS_COMPAT) += compat.o
 obj-$(CONFIG_PROC_FS) += proc.o
diff --git a/security/keys/compat.c b/security/keys/compat.c
index aff8b22..3303673 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -1,6 +1,6 @@
 /* compat.c: 32-bit compatibility syscall for 64-bit systems
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -24,7 +24,7 @@
  * - if you can, you should call sys_keyctl directly
  */
 asmlinkage long compat_sys_keyctl(u32 option,
-			      u32 arg2, u32 arg3, u32 arg4, u32 arg5)
+				  u32 arg2, u32 arg3, u32 arg4, u32 arg5)
 {
 	switch (option) {
 	case KEYCTL_GET_KEYRING_ID:
@@ -71,6 +71,9 @@
 	case KEYCTL_NEGATE:
 		return keyctl_negate_key(arg2, arg3, arg4);
 
+	case KEYCTL_SET_REQKEY_KEYRING:
+		return keyctl_set_reqkey_keyring(arg2);
+
 	default:
 		return -EOPNOTSUPP;
 	}
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 67b2b93..46c8602 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -1,6 +1,6 @@
 /* internal.h: authentication token and access key management internal defs
  *
- * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -15,6 +15,16 @@
 #include <linux/key.h>
 #include <linux/key-ui.h>
 
+#if 0
+#define kenter(FMT, a...)	printk("==> %s("FMT")\n",__FUNCTION__ , ## a)
+#define kleave(FMT, a...)	printk("<== %s()"FMT"\n",__FUNCTION__ , ## a)
+#define kdebug(FMT, a...)	printk(FMT"\n" , ## a)
+#else
+#define kenter(FMT, a...)	do {} while(0)
+#define kleave(FMT, a...)	do {} while(0)
+#define kdebug(FMT, a...)	do {} while(0)
+#endif
+
 extern struct key_type key_type_dead;
 extern struct key_type key_type_user;
 
@@ -66,20 +76,46 @@
 					const char *description,
 					key_perm_t perm);
 
+extern struct key *keyring_search_instkey(struct key *keyring,
+					  key_serial_t target_id);
+
 typedef int (*key_match_func_t)(const struct key *, const void *);
 
 extern struct key *keyring_search_aux(struct key *keyring,
+				      struct task_struct *tsk,
 				      struct key_type *type,
 				      const void *description,
 				      key_match_func_t match);
 
-extern struct key *search_process_keyrings_aux(struct key_type *type,
-					       const void *description,
-					       key_match_func_t match);
+extern struct key *search_process_keyrings(struct key_type *type,
+					   const void *description,
+					   key_match_func_t match,
+					   struct task_struct *tsk);
 
 extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
 
 extern int install_thread_keyring(struct task_struct *tsk);
+extern int install_process_keyring(struct task_struct *tsk);
+
+extern struct key *request_key_and_link(struct key_type *type,
+					const char *description,
+					const char *callout_info,
+					struct key *dest_keyring);
+
+/*
+ * request_key authorisation
+ */
+struct request_key_auth {
+	struct key		*target_key;
+	struct task_struct	*context;
+	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);
+
+extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
 
 /*
  * keyctl functions
@@ -100,6 +136,7 @@
 extern long keyctl_instantiate_key(key_serial_t, const void __user *,
 				   size_t, key_serial_t);
 extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
+extern long keyctl_set_reqkey_keyring(int);
 
 
 /*
diff --git a/security/keys/key.c b/security/keys/key.c
index 1fdfccb..3304d37 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -1,6 +1,6 @@
 /* key.c: basic authentication token and access key management
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -391,7 +391,8 @@
 static int __key_instantiate_and_link(struct key *key,
 				      const void *data,
 				      size_t datalen,
-				      struct key *keyring)
+				      struct key *keyring,
+				      struct key *instkey)
 {
 	int ret, awaken;
 
@@ -419,6 +420,10 @@
 			/* and link it into the destination keyring */
 			if (keyring)
 				ret = __key_link(keyring, key);
+
+			/* disable the authorisation key */
+			if (instkey)
+				key_revoke(instkey);
 		}
 	}
 
@@ -439,19 +444,21 @@
 int key_instantiate_and_link(struct key *key,
 			     const void *data,
 			     size_t datalen,
-			     struct key *keyring)
+			     struct key *keyring,
+			     struct key *instkey)
 {
 	int ret;
 
 	if (keyring)
 		down_write(&keyring->sem);
 
-	ret = __key_instantiate_and_link(key, data, datalen, keyring);
+	ret = __key_instantiate_and_link(key, data, datalen, keyring, instkey);
 
 	if (keyring)
 		up_write(&keyring->sem);
 
 	return ret;
+
 } /* end key_instantiate_and_link() */
 
 EXPORT_SYMBOL(key_instantiate_and_link);
@@ -462,7 +469,8 @@
  */
 int key_negate_and_link(struct key *key,
 			unsigned timeout,
-			struct key *keyring)
+			struct key *keyring,
+			struct key *instkey)
 {
 	struct timespec now;
 	int ret, awaken;
@@ -495,6 +503,10 @@
 		/* and link it into the destination keyring */
 		if (keyring)
 			ret = __key_link(keyring, key);
+
+		/* disable the authorisation key */
+		if (instkey)
+			key_revoke(instkey);
 	}
 
 	up_write(&key_construction_sem);
@@ -781,7 +793,7 @@
 	}
 
 	/* instantiate it and link it into the target keyring */
-	ret = __key_instantiate_and_link(key, payload, plen, keyring);
+	ret = __key_instantiate_and_link(key, payload, plen, keyring, NULL);
 	if (ret < 0) {
 		key_put(key);
 		key = ERR_PTR(ret);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index cedb732..fea2628 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1,6 +1,6 @@
 /* keyctl.c: userspace keyctl operations
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -49,6 +49,13 @@
 		goto error;
 	type[31] = '\0';
 
+	if (!type[0])
+		goto error;
+
+	ret = -EPERM;
+	if (type[0] == '.')
+		goto error;
+
 	ret = -EFAULT;
 	dlen = strnlen_user(_description, PAGE_SIZE - 1);
 	if (dlen <= 0)
@@ -82,7 +89,7 @@
 	}
 
 	/* find the target keyring (which must be writable) */
-	keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+	keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
 	if (IS_ERR(keyring)) {
 		ret = PTR_ERR(keyring);
 		goto error3;
@@ -181,7 +188,7 @@
 	/* get the destination keyring if specified */
 	dest = NULL;
 	if (destringid) {
-		dest = lookup_user_key(destringid, 1, 0, KEY_WRITE);
+		dest = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
 		if (IS_ERR(dest)) {
 			ret = PTR_ERR(dest);
 			goto error3;
@@ -196,23 +203,15 @@
 	}
 
 	/* do the search */
-	key = request_key(ktype, description, callout_info);
+	key = request_key_and_link(ktype, description, callout_info, dest);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error5;
 	}
 
-	/* link the resulting key to the destination keyring */
-	if (dest) {
-		ret = key_link(dest, key);
-		if (ret < 0)
-			goto error6;
-	}
-
 	ret = key->serial;
 
- error6:
-	key_put(key);
+ 	key_put(key);
  error5:
 	key_type_put(ktype);
  error4:
@@ -237,7 +236,7 @@
 	struct key *key;
 	long ret;
 
-	key = lookup_user_key(id, create, 0, KEY_SEARCH);
+	key = lookup_user_key(NULL, id, create, 0, KEY_SEARCH);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error;
@@ -324,7 +323,7 @@
 	}
 
 	/* find the target key (which must be writable) */
-	key = lookup_user_key(id, 0, 0, KEY_WRITE);
+	key = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error2;
@@ -352,7 +351,7 @@
 	struct key *key;
 	long ret;
 
-	key = lookup_user_key(id, 0, 0, KEY_WRITE);
+	key = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error;
@@ -378,7 +377,7 @@
 	struct key *keyring;
 	long ret;
 
-	keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+	keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
 	if (IS_ERR(keyring)) {
 		ret = PTR_ERR(keyring);
 		goto error;
@@ -404,13 +403,13 @@
 	struct key *keyring, *key;
 	long ret;
 
-	keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+	keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
 	if (IS_ERR(keyring)) {
 		ret = PTR_ERR(keyring);
 		goto error;
 	}
 
-	key = lookup_user_key(id, 1, 0, KEY_LINK);
+	key = lookup_user_key(NULL, id, 1, 0, KEY_LINK);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error2;
@@ -438,13 +437,13 @@
 	struct key *keyring, *key;
 	long ret;
 
-	keyring = lookup_user_key(ringid, 0, 0, KEY_WRITE);
+	keyring = lookup_user_key(NULL, ringid, 0, 0, KEY_WRITE);
 	if (IS_ERR(keyring)) {
 		ret = PTR_ERR(keyring);
 		goto error;
 	}
 
-	key = lookup_user_key(id, 0, 0, 0);
+	key = lookup_user_key(NULL, id, 0, 0, 0);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error2;
@@ -475,16 +474,29 @@
 			 char __user *buffer,
 			 size_t buflen)
 {
-	struct key *key;
+	struct key *key, *instkey;
 	char *tmpbuf;
 	long ret;
 
-	key = lookup_user_key(keyid, 0, 1, KEY_VIEW);
+	key = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
 	if (IS_ERR(key)) {
+		/* viewing a key under construction is permitted if we have the
+		 * authorisation token handy */
+		if (PTR_ERR(key) == -EACCES) {
+			instkey = key_get_instantiation_authkey(keyid);
+			if (!IS_ERR(instkey)) {
+				key_put(instkey);
+				key = lookup_user_key(NULL, keyid, 0, 1, 0);
+				if (!IS_ERR(key))
+					goto okay;
+			}
+		}
+
 		ret = PTR_ERR(key);
 		goto error;
 	}
 
+okay:
 	/* calculate how much description we're going to return */
 	ret = -ENOMEM;
 	tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
@@ -568,7 +580,7 @@
 		goto error2;
 
 	/* get the keyring at which to begin the search */
-	keyring = lookup_user_key(ringid, 0, 0, KEY_SEARCH);
+	keyring = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH);
 	if (IS_ERR(keyring)) {
 		ret = PTR_ERR(keyring);
 		goto error2;
@@ -577,7 +589,7 @@
 	/* get the destination keyring if specified */
 	dest = NULL;
 	if (destringid) {
-		dest = lookup_user_key(destringid, 1, 0, KEY_WRITE);
+		dest = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
 		if (IS_ERR(dest)) {
 			ret = PTR_ERR(dest);
 			goto error3;
@@ -656,24 +668,23 @@
 	long ret;
 
 	/* find the key first */
-	key = lookup_user_key(keyid, 0, 0, 0);
+	key = lookup_user_key(NULL, keyid, 0, 0, 0);
 	if (!IS_ERR(key)) {
 		/* see if we can read it directly */
 		if (key_permission(key, KEY_READ))
 			goto can_read_key;
 
-		/* can't; see if it's searchable from this process's
-		 * keyrings */
-		ret = -ENOKEY;
-		if (key_permission(key, KEY_SEARCH)) {
-			/* okay - we do have search permission on the key
-			 * itself, but do we have the key? */
-			skey = search_process_keyrings_aux(key->type, key,
-							   keyctl_read_key_same);
-			if (!IS_ERR(skey))
-				goto can_read_key2;
-		}
+		/* we can't; see if it's searchable from this process's
+		 * keyrings
+		 * - we automatically take account of the fact that it may be
+		 *   dangling off an instantiation key
+		 */
+		skey = search_process_keyrings(key->type, key,
+					       keyctl_read_key_same, current);
+		if (!IS_ERR(skey))
+			goto can_read_key2;
 
+		ret = PTR_ERR(skey);
 		goto error2;
 	}
 
@@ -719,7 +730,7 @@
 	if (uid == (uid_t) -1 && gid == (gid_t) -1)
 		goto error;
 
-	key = lookup_user_key(id, 1, 1, 0);
+	key = lookup_user_key(NULL, id, 1, 1, 0);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error;
@@ -776,7 +787,7 @@
 	if (perm & ~(KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
 		goto error;
 
-	key = lookup_user_key(id, 1, 1, 0);
+	key = lookup_user_key(NULL, id, 1, 1, 0);
 	if (IS_ERR(key)) {
 		ret = PTR_ERR(key);
 		goto error;
@@ -809,7 +820,8 @@
 			    size_t plen,
 			    key_serial_t ringid)
 {
-	struct key *key, *keyring;
+	struct request_key_auth *rka;
+	struct key *instkey, *keyring;
 	void *payload;
 	long ret;
 
@@ -831,18 +843,21 @@
 			goto error2;
 	}
 
-	/* find the target key (which must be writable) */
-	key = lookup_user_key(id, 0, 1, KEY_WRITE);
-	if (IS_ERR(key)) {
-		ret = PTR_ERR(key);
+	/* find the instantiation authorisation key */
+	instkey = key_get_instantiation_authkey(id);
+	if (IS_ERR(instkey)) {
+		ret = PTR_ERR(instkey);
 		goto error2;
 	}
 
-	/* find the destination keyring if present (which must also be
-	 * writable) */
+	rka = instkey->payload.data;
+
+	/* find the destination keyring amongst those belonging to the
+	 * requesting task */
 	keyring = NULL;
 	if (ringid) {
-		keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+		keyring = lookup_user_key(rka->context, ringid, 1, 0,
+					  KEY_WRITE);
 		if (IS_ERR(keyring)) {
 			ret = PTR_ERR(keyring);
 			goto error3;
@@ -850,11 +865,12 @@
 	}
 
 	/* instantiate the key and link it into a keyring */
-	ret = key_instantiate_and_link(key, payload, plen, keyring);
+	ret = key_instantiate_and_link(rka->target_key, payload, plen,
+				       keyring, instkey);
 
 	key_put(keyring);
  error3:
-	key_put(key);
+	key_put(instkey);
  error2:
 	kfree(payload);
  error:
@@ -869,21 +885,24 @@
  */
 long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
 {
-	struct key *key, *keyring;
+	struct request_key_auth *rka;
+	struct key *instkey, *keyring;
 	long ret;
 
-	/* find the target key (which must be writable) */
-	key = lookup_user_key(id, 0, 1, KEY_WRITE);
-	if (IS_ERR(key)) {
-		ret = PTR_ERR(key);
+	/* find the instantiation authorisation key */
+	instkey = key_get_instantiation_authkey(id);
+	if (IS_ERR(instkey)) {
+		ret = PTR_ERR(instkey);
 		goto error;
 	}
 
+	rka = instkey->payload.data;
+
 	/* find the destination keyring if present (which must also be
 	 * writable) */
 	keyring = NULL;
 	if (ringid) {
-		keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+		keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
 		if (IS_ERR(keyring)) {
 			ret = PTR_ERR(keyring);
 			goto error2;
@@ -891,11 +910,11 @@
 	}
 
 	/* instantiate the key and link it into a keyring */
-	ret = key_negate_and_link(key, timeout, keyring);
+	ret = key_negate_and_link(rka->target_key, timeout, keyring, instkey);
 
 	key_put(keyring);
  error2:
-	key_put(key);
+	key_put(instkey);
  error:
 	return ret;
 
@@ -903,6 +922,44 @@
 
 /*****************************************************************************/
 /*
+ * set the default keyring in which request_key() will cache keys
+ * - return the old setting
+ */
+long keyctl_set_reqkey_keyring(int reqkey_defl)
+{
+	int ret;
+
+	switch (reqkey_defl) {
+	case KEY_REQKEY_DEFL_THREAD_KEYRING:
+		ret = install_thread_keyring(current);
+		if (ret < 0)
+			return ret;
+		goto set;
+
+	case KEY_REQKEY_DEFL_PROCESS_KEYRING:
+		ret = install_process_keyring(current);
+		if (ret < 0)
+			return ret;
+
+	case KEY_REQKEY_DEFL_DEFAULT:
+	case KEY_REQKEY_DEFL_SESSION_KEYRING:
+	case KEY_REQKEY_DEFL_USER_KEYRING:
+	case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
+	set:
+		current->jit_keyring = reqkey_defl;
+
+	case KEY_REQKEY_DEFL_NO_CHANGE:
+		return current->jit_keyring;
+
+	case KEY_REQKEY_DEFL_GROUP_KEYRING:
+	default:
+		return -EINVAL;
+	}
+
+} /* end keyctl_set_reqkey_keyring() */
+
+/*****************************************************************************/
+/*
  * the key control system call
  */
 asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
@@ -971,6 +1028,9 @@
 					 (unsigned) arg3,
 					 (key_serial_t) arg4);
 
+	case KEYCTL_SET_REQKEY_KEYRING:
+		return keyctl_set_reqkey_keyring(arg2);
+
 	default:
 		return -EOPNOTSUPP;
 	}
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index c9a5de1..90a551e 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -1,6 +1,6 @@
 /* keyring.c: keyring handling
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -308,7 +308,7 @@
 			    uid, gid, KEY_USR_ALL, not_in_quota);
 
 	if (!IS_ERR(keyring)) {
-		ret = key_instantiate_and_link(keyring, NULL, 0, dest);
+		ret = key_instantiate_and_link(keyring, NULL, 0, dest, NULL);
 		if (ret < 0) {
 			key_put(keyring);
 			keyring = ERR_PTR(ret);
@@ -326,11 +326,12 @@
  * - we only find keys on which we have search permission
  * - we use the supplied match function to see if the description (or other
  *   feature of interest) matches
- * - we readlock the keyrings as we search down the tree
+ * - we rely on RCU to prevent the keyring lists from disappearing on us
  * - we return -EAGAIN if we didn't find any matching key
  * - we return -ENOKEY if we only found negative matching keys
  */
 struct key *keyring_search_aux(struct key *keyring,
+			       struct task_struct *context,
 			       struct key_type *type,
 			       const void *description,
 			       key_match_func_t match)
@@ -352,7 +353,7 @@
 
 	/* top keyring must have search permission to begin the search */
 	key = ERR_PTR(-EACCES);
-	if (!key_permission(keyring, KEY_SEARCH))
+	if (!key_task_permission(keyring, context, KEY_SEARCH))
 		goto error;
 
 	key = ERR_PTR(-ENOTDIR);
@@ -392,7 +393,7 @@
 			continue;
 
 		/* key must have search permissions */
-		if (!key_permission(key, KEY_SEARCH))
+		if (!key_task_permission(key, context, KEY_SEARCH))
 			continue;
 
 		/* we set a different error code if we find a negative key */
@@ -418,7 +419,7 @@
 		if (sp >= KEYRING_SEARCH_MAX_DEPTH)
 			continue;
 
-		if (!key_permission(key, KEY_SEARCH))
+		if (!key_task_permission(key, context, KEY_SEARCH))
 			continue;
 
 		/* stack the current position */
@@ -468,7 +469,11 @@
 			   struct key_type *type,
 			   const char *description)
 {
-	return keyring_search_aux(keyring, type, description, type->match);
+	if (!type->match)
+		return ERR_PTR(-ENOKEY);
+
+	return keyring_search_aux(keyring, current,
+				  type, description, type->match);
 
 } /* end keyring_search() */
 
@@ -496,7 +501,8 @@
 			key = klist->keys[loop];
 
 			if (key->type == ktype &&
-			    key->type->match(key, description) &&
+			    (!key->type->match ||
+			     key->type->match(key, description)) &&
 			    key_permission(key, perm) &&
 			    !test_bit(KEY_FLAG_REVOKED, &key->flags)
 			    )
@@ -517,6 +523,51 @@
 
 /*****************************************************************************/
 /*
+ * 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
  * - all named keyrings are searched
  * - only find keyrings with search permission for the process
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 972e301..34db087 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -165,7 +165,7 @@
 /*
  * make sure a process keyring is installed
  */
-static int install_process_keyring(struct task_struct *tsk)
+int install_process_keyring(struct task_struct *tsk)
 {
 	unsigned long flags;
 	struct key *keyring;
@@ -376,12 +376,13 @@
  * - we return -EAGAIN if we didn't find any matching key
  * - we return -ENOKEY if we found only negative matching keys
  */
-struct key *search_process_keyrings_aux(struct key_type *type,
-					const void *description,
-					key_match_func_t match)
+struct key *search_process_keyrings(struct key_type *type,
+				    const void *description,
+				    key_match_func_t match,
+				    struct task_struct *context)
 {
-	struct task_struct *tsk = current;
-	struct key *key, *ret, *err;
+	struct request_key_auth *rka;
+	struct key *key, *ret, *err, *instkey;
 
 	/* 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;
@@ -395,9 +396,9 @@
 	err = ERR_PTR(-EAGAIN);
 
 	/* search the thread keyring first */
-	if (tsk->thread_keyring) {
-		key = keyring_search_aux(tsk->thread_keyring, type,
-					 description, match);
+	if (context->thread_keyring) {
+		key = keyring_search_aux(context->thread_keyring,
+					 context, type, description, match);
 		if (!IS_ERR(key))
 			goto found;
 
@@ -415,9 +416,9 @@
 	}
 
 	/* search the process keyring second */
-	if (tsk->signal->process_keyring) {
-		key = keyring_search_aux(tsk->signal->process_keyring,
-					 type, description, match);
+	if (context->signal->process_keyring) {
+		key = keyring_search_aux(context->signal->process_keyring,
+					 context, type, description, match);
 		if (!IS_ERR(key))
 			goto found;
 
@@ -434,53 +435,93 @@
 		}
 	}
 
-	/* search the session keyring last */
-	if (tsk->signal->session_keyring) {
+	/* search the session keyring */
+	if (context->signal->session_keyring) {
 		rcu_read_lock();
 		key = keyring_search_aux(
-			rcu_dereference(tsk->signal->session_keyring),
-			type, description, match);
+			rcu_dereference(context->signal->session_keyring),
+			context, type, description, match);
 		rcu_read_unlock();
-	}
-	else {
-		key = keyring_search_aux(tsk->user->session_keyring,
-					 type, description, match);
-	}
 
-	if (!IS_ERR(key))
-		goto found;
+		if (!IS_ERR(key))
+			goto found;
 
-	switch (PTR_ERR(key)) {
-	case -EAGAIN: /* no key */
-		if (ret)
+		switch (PTR_ERR(key)) {
+		case -EAGAIN: /* no key */
+			if (ret)
+				break;
+		case -ENOKEY: /* negative key */
+			ret = key;
 			break;
-	case -ENOKEY: /* negative key */
-		ret = key;
-		break;
-	default:
-		err = key;
-		break;
+		default:
+			err = key;
+			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 = __keyring_search_one(
+			rcu_dereference(context->signal->session_keyring),
+			&key_type_request_key_auth, NULL, 0);
+		rcu_read_unlock();
+
+		if (IS_ERR(instkey))
+			goto no_key;
+
+		rka = instkey->payload.data;
+
+		key = search_process_keyrings(type, description, match,
+					      rka->context);
+		key_put(instkey);
+
+		if (!IS_ERR(key))
+			goto found;
+
+		switch (PTR_ERR(key)) {
+		case -EAGAIN: /* no key */
+			if (ret)
+				break;
+		case -ENOKEY: /* negative key */
+			ret = key;
+			break;
+		default:
+			err = key;
+			break;
+		}
+	}
+	/* or search the user-session keyring */
+	else {
+		key = keyring_search_aux(context->user->session_keyring,
+					 context, type, description, match);
+		if (!IS_ERR(key))
+			goto found;
+
+		switch (PTR_ERR(key)) {
+		case -EAGAIN: /* no key */
+			if (ret)
+				break;
+		case -ENOKEY: /* negative key */
+			ret = key;
+			break;
+		default:
+			err = key;
+			break;
+		}
 	}
 
+
+no_key:
 	/* no key - decide on the error we're going to go for */
 	key = ret ? ret : err;
 
- found:
+found:
 	return key;
 
-} /* end search_process_keyrings_aux() */
-
-/*****************************************************************************/
-/*
- * search the process keyrings for the first matching key
- * - we return -EAGAIN if we didn't find any matching key
- * - we return -ENOKEY if we found only negative matching keys
- */
-struct key *search_process_keyrings(struct key_type *type,
-				    const char *description)
-{
-	return search_process_keyrings_aux(type, description, type->match);
-
 } /* end search_process_keyrings() */
 
 /*****************************************************************************/
@@ -489,72 +530,73 @@
  * - don't create special keyrings unless so requested
  * - partially constructed keys aren't found unless requested
  */
-struct key *lookup_user_key(key_serial_t id, int create, int partial,
-			    key_perm_t perm)
+struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
+			    int create, int partial, key_perm_t perm)
 {
-	struct task_struct *tsk = current;
-	unsigned long flags;
 	struct key *key;
 	int ret;
 
+	if (!context)
+		context = current;
+
 	key = ERR_PTR(-ENOKEY);
 
 	switch (id) {
 	case KEY_SPEC_THREAD_KEYRING:
-		if (!tsk->thread_keyring) {
+		if (!context->thread_keyring) {
 			if (!create)
 				goto error;
 
-			ret = install_thread_keyring(tsk);
+			ret = install_thread_keyring(context);
 			if (ret < 0) {
 				key = ERR_PTR(ret);
 				goto error;
 			}
 		}
 
-		key = tsk->thread_keyring;
+		key = context->thread_keyring;
 		atomic_inc(&key->usage);
 		break;
 
 	case KEY_SPEC_PROCESS_KEYRING:
-		if (!tsk->signal->process_keyring) {
+		if (!context->signal->process_keyring) {
 			if (!create)
 				goto error;
 
-			ret = install_process_keyring(tsk);
+			ret = install_process_keyring(context);
 			if (ret < 0) {
 				key = ERR_PTR(ret);
 				goto error;
 			}
 		}
 
-		key = tsk->signal->process_keyring;
+		key = context->signal->process_keyring;
 		atomic_inc(&key->usage);
 		break;
 
 	case KEY_SPEC_SESSION_KEYRING:
-		if (!tsk->signal->session_keyring) {
+		if (!context->signal->session_keyring) {
 			/* always install a session keyring upon access if one
 			 * doesn't exist yet */
 			ret = install_session_keyring(
-			       tsk, tsk->user->session_keyring);
+			       context, context->user->session_keyring);
 			if (ret < 0)
 				goto error;
 		}
 
-		spin_lock_irqsave(&tsk->sighand->siglock, flags);
-		key = tsk->signal->session_keyring;
+		rcu_read_lock();
+		key = rcu_dereference(context->signal->session_keyring);
 		atomic_inc(&key->usage);
-		spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
+		rcu_read_unlock();
 		break;
 
 	case KEY_SPEC_USER_KEYRING:
-		key = tsk->user->uid_keyring;
+		key = context->user->uid_keyring;
 		atomic_inc(&key->usage);
 		break;
 
 	case KEY_SPEC_USER_SESSION_KEYRING:
-		key = tsk->user->session_keyring;
+		key = context->user->session_keyring;
 		atomic_inc(&key->usage);
 		break;
 
@@ -574,7 +616,7 @@
 		break;
 	}
 
-	/* check the status and permissions */
+	/* check the status */
 	if (perm) {
 		ret = key_validate(key);
 		if (ret < 0)
@@ -585,8 +627,10 @@
 	if (!partial && !test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
 		goto invalid_key;
 
+	/* check the permissions */
 	ret = -EACCES;
-	if (!key_permission(key, perm))
+
+	if (!key_task_permission(key, context, perm))
 		goto invalid_key;
 
  error:
@@ -609,7 +653,6 @@
 long join_session_keyring(const char *name)
 {
 	struct task_struct *tsk = current;
-	unsigned long flags;
 	struct key *keyring;
 	long ret;
 
@@ -619,9 +662,9 @@
 		if (ret < 0)
 			goto error;
 
-		spin_lock_irqsave(&tsk->sighand->siglock, flags);
-		ret = tsk->signal->session_keyring->serial;
-		spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
+		rcu_read_lock();
+		ret = rcu_dereference(tsk->signal->session_keyring)->serial;
+		rcu_read_unlock();
 		goto error;
 	}
 
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 54aa7b7..dfcd983 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -1,6 +1,6 @@
 /* request_key.c: request a key from userspace
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -13,6 +13,7 @@
 #include <linux/sched.h>
 #include <linux/kmod.h>
 #include <linux/err.h>
+#include <linux/keyctl.h>
 #include "internal.h"
 
 struct key_construction {
@@ -27,18 +28,26 @@
 /*
  * request userspace finish the construction of a key
  * - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring> <info>"
- * - if callout_info is an empty string, it'll be rendered as a "-" instead
  */
 static int call_request_key(struct key *key,
 			    const char *op,
 			    const char *callout_info)
 {
 	struct task_struct *tsk = current;
-	unsigned long flags;
 	key_serial_t prkey, sskey;
+	struct key *session_keyring, *rkakey;
 	char *argv[10], *envp[3], uid_str[12], gid_str[12];
 	char key_str[12], keyring_str[3][12];
-	int i;
+	int ret, i;
+
+	kenter("{%d},%s,%s", key->serial, op, callout_info);
+
+	/* 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;
+	}
 
 	/* record the UID and GID */
 	sprintf(uid_str, "%d", current->fsuid);
@@ -55,17 +64,17 @@
 	if (tsk->signal->process_keyring)
 		prkey = tsk->signal->process_keyring->serial;
 
-	sskey = 0;
-	spin_lock_irqsave(&tsk->sighand->siglock, flags);
-	if (tsk->signal->session_keyring)
-		sskey = tsk->signal->session_keyring->serial;
-	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
-
-
-	if (!sskey)
-		sskey = tsk->user->session_keyring->serial;
-
 	sprintf(keyring_str[1], "%d", prkey);
+
+	if (tsk->signal->session_keyring) {
+		rcu_read_lock();
+		sskey = rcu_dereference(tsk->signal->session_keyring)->serial;
+		rcu_read_unlock();
+	}
+	else {
+		sskey = tsk->user->session_keyring->serial;
+	}
+
 	sprintf(keyring_str[2], "%d", sskey);
 
 	/* set up a minimal environment */
@@ -84,11 +93,20 @@
 	argv[i++] = keyring_str[0];
 	argv[i++] = keyring_str[1];
 	argv[i++] = keyring_str[2];
-	argv[i++] = callout_info[0] ? (char *) callout_info : "-";
+	argv[i++] = (char *) callout_info;
 	argv[i] = NULL;
 
 	/* do it */
-	return call_usermodehelper_keys(argv[0], argv, envp, NULL, 1);
+	ret = call_usermodehelper_keys(argv[0], argv, envp, session_keyring, 1);
+
+	/* dispose of the special keys */
+	key_revoke(rkakey);
+	key_put(rkakey);
+	key_put(session_keyring);
+
+ error:
+	kleave(" = %d", ret);
+	return ret;
 
 } /* end call_request_key() */
 
@@ -107,6 +125,8 @@
 	struct key *key;
 	int ret, negated;
 
+	kenter("%s,%s,%s", type->name, description, callout_info);
+
 	/* create a key and add it to the queue */
 	key = key_alloc(type, description,
 			current->fsuid, current->fsgid, KEY_USR_ALL, 0);
@@ -143,6 +163,7 @@
 	}
 
  out:
+	kleave(" = %p", key);
 	return key;
 
  request_failed:
@@ -216,6 +237,9 @@
 
 	DECLARE_WAITQUEUE(myself, current);
 
+	kenter("%s,%s,{%d},%s",
+	       type->name, description, user->uid, callout_info);
+
 	/* see if there's such a key under construction already */
 	down_write(&key_construction_sem);
 
@@ -232,6 +256,7 @@
 	/* see about getting userspace to construct the key */
 	key = __request_key_construction(type, description, callout_info);
  error:
+	kleave(" = %p", key);
 	return key;
 
 	/* someone else has the same key under construction
@@ -245,9 +270,11 @@
 	add_wait_queue(&request_key_conswq, &myself);
 
 	for (;;) {
-		set_current_state(TASK_UNINTERRUPTIBLE);
+		set_current_state(TASK_INTERRUPTIBLE);
 		if (!test_bit(KEY_FLAG_USER_CONSTRUCT, &ckey->flags))
 			break;
+		if (signal_pending(current))
+			break;
 		schedule();
 	}
 
@@ -267,21 +294,83 @@
 
 /*****************************************************************************/
 /*
+ * link a freshly minted key to an appropriate destination keyring
+ */
+static void request_key_link(struct key *key, struct key *dest_keyring)
+{
+	struct task_struct *tsk = current;
+	struct key *drop = NULL;
+
+	kenter("{%d},%p", key->serial, dest_keyring);
+
+	/* find the appropriate keyring */
+	if (!dest_keyring) {
+		switch (tsk->jit_keyring) {
+		case KEY_REQKEY_DEFL_DEFAULT:
+		case KEY_REQKEY_DEFL_THREAD_KEYRING:
+			dest_keyring = tsk->thread_keyring;
+			if (dest_keyring)
+				break;
+
+		case KEY_REQKEY_DEFL_PROCESS_KEYRING:
+			dest_keyring = tsk->signal->process_keyring;
+			if (dest_keyring)
+				break;
+
+		case KEY_REQKEY_DEFL_SESSION_KEYRING:
+			rcu_read_lock();
+			dest_keyring = key_get(
+				rcu_dereference(tsk->signal->session_keyring));
+			rcu_read_unlock();
+			drop = dest_keyring;
+
+			if (dest_keyring)
+				break;
+
+		case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
+			dest_keyring = current->user->session_keyring;
+			break;
+
+		case KEY_REQKEY_DEFL_USER_KEYRING:
+			dest_keyring = current->user->uid_keyring;
+			break;
+
+		case KEY_REQKEY_DEFL_GROUP_KEYRING:
+		default:
+			BUG();
+		}
+	}
+
+	/* and attach the key to it */
+	key_link(dest_keyring, key);
+
+	key_put(drop);
+
+	kleave("");
+
+} /* end request_key_link() */
+
+/*****************************************************************************/
+/*
  * request a key
  * - search the process's keyrings
  * - check the list of keys being created or updated
- * - call out to userspace for a key if requested (supplementary info can be
- *   passed)
+ * - call out to userspace for a key if supplementary info was provided
+ * - cache the key in an appropriate keyring
  */
-struct key *request_key(struct key_type *type,
-			const char *description,
-			const char *callout_info)
+struct key *request_key_and_link(struct key_type *type,
+				 const char *description,
+				 const char *callout_info,
+				 struct key *dest_keyring)
 {
 	struct key_user *user;
 	struct key *key;
 
+	kenter("%s,%s,%s,%p",
+	       type->name, description, callout_info, dest_keyring);
+
 	/* search all the process keyrings for a key */
-	key = search_process_keyrings_aux(type, description, type->match);
+	key = search_process_keyrings(type, description, type->match, current);
 
 	if (PTR_ERR(key) == -EAGAIN) {
 		/* the search failed, but the keyrings were searchable, so we
@@ -292,12 +381,13 @@
 
 		/* - get hold of the user's construction queue */
 		user = key_user_lookup(current->fsuid);
-		if (!user) {
-			key = ERR_PTR(-ENOMEM);
-			goto error;
-		}
+		if (!user)
+			goto nomem;
 
-		for (;;) {
+		do {
+			if (signal_pending(current))
+				goto interrupted;
+
 			/* ask userspace (returns NULL if it waited on a key
 			 * being constructed) */
 			key = request_key_construction(type, description,
@@ -307,18 +397,46 @@
 
 			/* someone else made the key we want, so we need to
 			 * search again as it might now be available to us */
-			key = search_process_keyrings_aux(type, description,
-							  type->match);
-			if (PTR_ERR(key) != -EAGAIN)
-				break;
-		}
+			key = search_process_keyrings(type, description,
+						      type->match, current);
+
+		} while (PTR_ERR(key) == -EAGAIN);
 
 		key_user_put(user);
+
+		/* link the new key into the appropriate keyring */
+		if (!PTR_ERR(key))
+			request_key_link(key, dest_keyring);
 	}
 
- error:
+error:
+	kleave(" = %p", key);
 	return key;
 
+nomem:
+	key = ERR_PTR(-ENOMEM);
+	goto error;
+
+interrupted:
+	key_user_put(user);
+	key = ERR_PTR(-EINTR);
+	goto error;
+
+} /* end request_key_and_link() */
+
+/*****************************************************************************/
+/*
+ * request a key
+ * - search the process's keyrings
+ * - check the list of keys being created or updated
+ * - call out to userspace for a key if supplementary info was provided
+ */
+struct key *request_key(struct key_type *type,
+			const char *description,
+			const char *callout_info)
+{
+	return request_key_and_link(type, description, callout_info, NULL);
+
 } /* end request_key() */
 
 EXPORT_SYMBOL(request_key);
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
new file mode 100644
index 0000000..f222646
--- /dev/null
+++ b/security/keys/request_key_auth.c
@@ -0,0 +1,180 @@
+/* request_key_auth.c: request key authorisation controlling key def
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/seq_file.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 *);
+
+/*
+ * the request-key authorisation key type definition
+ */
+struct key_type key_type_request_key_auth = {
+	.name		= ".request_key_auth",
+	.def_datalen	= sizeof(struct request_key_auth),
+	.instantiate	= request_key_auth_instantiate,
+	.describe	= request_key_auth_describe,
+	.destroy	= request_key_auth_destroy,
+};
+
+/*****************************************************************************/
+/*
+ * instantiate a request-key authorisation record
+ */
+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;
+
+} /* end request_key_auth_instantiate() */
+
+/*****************************************************************************/
+/*
+ *
+ */
+static void request_key_auth_describe(const struct key *key,
+				      struct seq_file *m)
+{
+	struct request_key_auth *rka = key->payload.data;
+
+	seq_puts(m, "key:");
+	seq_puts(m, key->description);
+	seq_printf(m, " pid:%d", rka->pid);
+
+} /* end request_key_auth_describe() */
+
+/*****************************************************************************/
+/*
+ * destroy an instantiation authorisation token key
+ */
+static void request_key_auth_destroy(struct key *key)
+{
+	struct request_key_auth *rka = key->payload.data;
+
+	kenter("{%d}", key->serial);
+
+	key_put(rka->target_key);
+
+} /* end request_key_auth_destroy() */
+
+/*****************************************************************************/
+/*
+ * create a session keyring to be for the invokation of /sbin/request-key and
+ * stick an authorisation token in it
+ */
+struct key *request_key_auth_new(struct key *target, struct key **_rkakey)
+{
+	struct key *keyring, *rkakey = 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 the auth key */
+	sprintf(desc, "%x", target->serial);
+
+	rkakey = key_alloc(&key_type_request_key_auth, desc,
+			   current->fsuid, current->fsgid,
+			   KEY_USR_VIEW, 1);
+	if (IS_ERR(rkakey)) {
+		key_put(keyring);
+		kleave("= %ld", PTR_ERR(rkakey));
+		return rkakey;
+	}
+
+	/* 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);
+	}
+
+	*_rkakey = rkakey;
+	kleave(" = {%d} ({%d})", keyring->serial, rkakey->serial);
+	return keyring;
+
+} /* end request_key_auth_new() */
+
+/*****************************************************************************/
+/*
+ * get the authorisation key for instantiation of a specific key if attached to
+ * the current process's keyrings
+ * - this key is inserted into a keyring and that is set as /sbin/request-key's
+ *   session keyring
+ * - a target_id of zero specifies any valid token
+ */
+struct key *key_get_instantiation_authkey(key_serial_t target_id)
+{
+	struct task_struct *tsk = current;
+	struct key *instkey;
+
+	/* we must have our own personal session keyring */
+	if (!tsk->signal->session_keyring)
+		return ERR_PTR(-EACCES);
+
+	/* and it must contain a suitable request authorisation key
+	 * - lock RCU against session keyring changing
+	 */
+	rcu_read_lock();
+
+	instkey = keyring_search_instkey(
+		rcu_dereference(tsk->signal->session_keyring), target_id);
+
+	rcu_read_unlock();
+	return instkey;
+
+} /* end key_get_instantiation_authkey() */