Merge tag 'keys-request-20190626' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull request_key improvements from David Howells:
 "These are all request_key()-related, including a fix and some improvements:

   - Fix the lack of a Link permission check on a key found by
     request_key(), thereby enabling request_key() to link keys that
     don't grant this permission to the target keyring (which must still
     grant Write permission).

     Note that the key must be in the caller's keyrings already to be
     found.

   - Invalidate used request_key authentication keys rather than
     revoking them, so that they get cleaned up immediately rather than
     hanging around till the expiry time is passed.

   - Move the RCU locks outwards from the keyring search functions so
     that a request_key_rcu() can be provided. This can be called in RCU
     mode, so it can't sleep and can't upcall - but it can be called
     from LOOKUP_RCU pathwalk mode.

   - Cache the latest positive result of request_key*() temporarily in
     task_struct so that filesystems that make a lot of request_key()
     calls during pathwalk can take advantage of it to avoid having to
     redo the searching. This requires CONFIG_KEYS_REQUEST_CACHE=y.

     It is assumed that the key just found is likely to be used multiple
     times in each step in an RCU pathwalk, and is likely to be reused
     for the next step too.

     Note that the cleanup of the cache is done on TIF_NOTIFY_RESUME,
     just before userspace resumes, and on exit"

* tag 'keys-request-20190626' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  keys: Kill off request_key_async{,_with_auxdata}
  keys: Cache result of request_key*() temporarily in task_struct
  keys: Provide request_key_rcu()
  keys: Move the RCU locks outwards from the keyring search functions
  keys: Invalidate used request_key authentication keys
  keys: Fix request_key() lack of Link perm check on found key

15 files changed, 229 insertions, 164 deletions

diff --git a/Documentation/security/keys/core.rst b/Documentation/security/keys/core.rst
index 823d29bf44f7..a0e245f9576f 100644
--- a/Documentation/security/keys/core.rst
+++ b/Documentation/security/keys/core.rst
@@ -433,6 +433,10 @@ The main syscalls are:
      /sbin/request-key will be invoked in an attempt to obtain a key. The
      callout_info string will be passed as an argument to the program.
 
+     To link a key into the destination keyring the key must grant link
+     permission on the key to the caller and the keyring must grant write
+     permission.
+
      See also Documentation/security/keys/request-key.rst.
 
 
@@ -1111,36 +1115,14 @@ payload contents" for more information.
     is a blob of length callout_len, if given (the length may be 0).
 
 
- *  A key can be requested asynchronously by calling one of::
-
-	struct key *request_key_async(const struct key_type *type,
-				      const char *description,
-				      const void *callout_info,
-				      size_t callout_len);
-
-    or::
-
-	struct key *request_key_async_with_auxdata(const struct key_type *type,
-						   const char *description,
-						   const char *callout_info,
-					     	   size_t callout_len,
-					     	   void *aux);
-
-    which are asynchronous equivalents of request_key() and
-    request_key_with_auxdata() respectively.
-
-    These two functions return with the key potentially still under
-    construction.  To wait for construction completion, the following should be
-    called::
-
-	int wait_for_key_construction(struct key *key, bool intr);
+ *  To search for a key under RCU conditions, call::
 
-    The function will wait for the key to finish being constructed and then
-    invokes key_validate() to return an appropriate value to indicate the state
-    of the key (0 indicates the key is usable).
+	struct key *request_key_rcu(const struct key_type *type,
+				    const char *description);
 
-    If intr is true, then the wait can be interrupted by a signal, in which
-    case error ERESTARTSYS will be returned.
+    which is similar to request_key() except that it does not check for keys
+    that are under construction and it will not call out to userspace to
+    construct a key if it can't find a match.
 
 
  *  When it is no longer required, the key should be released using::
diff --git a/Documentation/security/keys/request-key.rst b/Documentation/security/keys/request-key.rst
index 600ad67d1707..5a210baa583a 100644
--- a/Documentation/security/keys/request-key.rst
+++ b/Documentation/security/keys/request-key.rst
@@ -23,18 +23,8 @@ or::
 
 or::
 
-	struct key *request_key_async(const struct key_type *type,
-				      const char *description,
-				      const char *callout_info,
-				      size_t callout_len);
-
-or::
-
-	struct key *request_key_async_with_auxdata(const struct key_type *type,
-						   const char *description,
-						   const char *callout_info,
-					     	   size_t callout_len,
-						   void *aux);
+	struct key *request_key_rcu(const struct key_type *type,
+				    const char *description);
 
 Or by userspace invoking the request_key system call::
 
@@ -48,14 +38,14 @@ does not need to link the key to a keyring to prevent it from being immediately
 destroyed.  The kernel interface returns a pointer directly to the key, and
 it's up to the caller to destroy the key.
 
-The request_key*_with_auxdata() calls are like the in-kernel request_key*()
-calls, except that they permit auxiliary data to be passed to the upcaller (the
+The request_key_with_auxdata() calls is like the in-kernel request_key() call,
+except that they permit auxiliary data to be passed to the upcaller (the
 default is NULL).  This is only useful for those key types that define their
 own upcall mechanism rather than using /sbin/request-key.
 
-The two async in-kernel calls may return keys that are still in the process of
-being constructed.  The two non-async ones will wait for construction to
-complete first.
+The request_key_rcu() call is like the in-kernel request_key() call, except
+that it doesn't check for keys that are under construction and doesn't attempt
+to construct missing keys.
 
 The userspace interface links the key to a keyring associated with the process
 to prevent the key from going away, and returns the serial number of the key to
@@ -148,7 +138,7 @@ The Search Algorithm
 
 A search of any particular keyring proceeds in the following fashion:
 
-  1) When the key management code searches for a key (keyring_search_aux) it
+  1) When the key management code searches for a key (keyring_search_rcu) it
      firstly calls key_permission(SEARCH) on the keyring it's starting with,
      if this denies permission, it doesn't search further.
 
@@ -167,6 +157,9 @@ The process stops immediately a valid key is found with permission granted to
 use it.  Any error from a previous match attempt is discarded and the key is
 returned.
 
+When request_key() is invoked, if CONFIG_KEYS_REQUEST_CACHE=y, a per-task
+one-key cache is first checked for a match.
+
 When search_process_keyrings() is invoked, it performs the following searches
 until one succeeds:
 
@@ -186,7 +179,9 @@ until one succeeds:
       c) The calling process's session keyring is searched.
 
 The moment one succeeds, all pending errors are discarded and the found key is
-returned.
+returned.  If CONFIG_KEYS_REQUEST_CACHE=y, then that key is placed in the
+per-task cache, displacing the previous key.  The cache is cleared on exit or
+just prior to resumption of userspace.
 
 Only if all these fail does the whole thing fail with the highest priority
 error.  Note that several errors may have come from LSM.
diff --git a/include/keys/request_key_auth-type.h b/include/keys/request_key_auth-type.h
index 20485ca481f4..36b89a933310 100644
--- a/include/keys/request_key_auth-type.h
+++ b/include/keys/request_key_auth-type.h
@@ -14,6 +14,7 @@
  * Authorisation record for request_key().
  */
 struct request_key_auth {
+	struct rcu_head		rcu;
 	struct key		*target_key;
 	struct key		*dest_keyring;
 	const struct cred	*cred;
diff --git a/include/linux/key.h b/include/linux/key.h
index 8b297b94bfb3..ad17c8f30b4c 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -269,23 +269,15 @@ extern struct key *request_key(struct key_type *type,
 			       const char *description,
 			       const char *callout_info);
 
+extern struct key *request_key_rcu(struct key_type *type,
+				   const char *description);
+
 extern struct key *request_key_with_auxdata(struct key_type *type,
 					    const char *description,
 					    const void *callout_info,
 					    size_t callout_len,
 					    void *aux);
 
-extern struct key *request_key_async(struct key_type *type,
-				     const char *description,
-				     const void *callout_info,
-				     size_t callout_len);
-
-extern struct key *request_key_async_with_auxdata(struct key_type *type,
-						  const char *description,
-						  const void *callout_info,
-						  size_t callout_len,
-						  void *aux);
-
 extern int wait_for_key_construction(struct key *key, bool intr);
 
 extern int key_validate(const struct key *key);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 459d95e4a574..8dc1811487f5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -892,6 +892,11 @@ struct task_struct {
 	/* Effective (overridable) subjective task credentials (COW): */
 	const struct cred __rcu		*cred;
 
+#ifdef CONFIG_KEYS
+	/* Cached requested key. */
+	struct key			*cached_requested_key;
+#endif
+
 	/*
 	 * executable name, excluding path.
 	 *
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 09d678433fc0..8446573cc682 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -184,6 +184,13 @@ static inline void tracehook_notify_resume(struct pt_regs *regs)
 	if (unlikely(current->task_works))
 		task_work_run();
 
+#ifdef CONFIG_KEYS_REQUEST_CACHE
+	if (unlikely(current->cached_requested_key)) {
+		key_put(current->cached_requested_key);
+		current->cached_requested_key = NULL;
+	}
+#endif
+
 	mem_cgroup_handle_over_high();
 	blkcg_maybe_throttle_current();
 }
diff --git a/kernel/cred.c b/kernel/cred.c
index 12a656217a70..f9a0ce66c9c3 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -170,6 +170,11 @@ void exit_creds(struct task_struct *tsk)
 	validate_creds(cred);
 	alter_cred_subscribers(cred, -1);
 	put_cred(cred);
+
+#ifdef CONFIG_KEYS_REQUEST_CACHE
+	key_put(current->cached_requested_key);
+	current->cached_requested_key = NULL;
+#endif
 }
 
 /**
@@ -323,6 +328,10 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
 	struct cred *new;
 	int ret;
 
+#ifdef CONFIG_KEYS_REQUEST_CACHE
+	p->cached_requested_key = NULL;
+#endif
+
 	if (
 #ifdef CONFIG_KEYS
 		!p->cred->thread_keyring &&
diff --git a/security/keys/Kconfig b/security/keys/Kconfig
index ee502e4d390b..dd313438fecf 100644
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -25,6 +25,24 @@ config KEYS_COMPAT
 	def_bool y
 	depends on COMPAT && KEYS
 
+config KEYS_REQUEST_CACHE
+	bool "Enable temporary caching of the last request_key() result"
+	depends on KEYS
+	help
+	  This option causes the result of the last successful request_key()
+	  call that didn't upcall to the kernel to be cached temporarily in the
+	  task_struct.  The cache is cleared by exit and just prior to the
+	  resumption of userspace.
+
+	  This allows the key used for multiple step processes where each step
+	  wants to request a key that is likely the same as the one requested
+	  by the last step to save on the searching.
+
+	  An example of such a process is a pathwalk through a network
+	  filesystem in which each method needs to request an authentication
+	  key.  Pathwalk will call multiple methods for each dentry traversed
+	  (permission, d_revalidate, lookup, getxattr, getacl, ...).
+
 config PERSISTENT_KEYRINGS
 	bool "Enable register of persistent per-UID keyrings"
 	depends on KEYS
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 0f48b53754b3..663f291e30d4 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -135,11 +135,11 @@ struct keyring_search_context {
 
 extern bool key_default_cmp(const struct key *key,
 			    const struct key_match_data *match_data);
-extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
+extern key_ref_t keyring_search_rcu(key_ref_t keyring_ref,
 				    struct keyring_search_context *ctx);
 
-extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
-extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
+extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx);
+extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx);
 
 extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
 
diff --git a/security/keys/key.c b/security/keys/key.c
index d3c17d76ea76..85dddc0190a7 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -455,7 +455,7 @@ static int __key_instantiate_and_link(struct key *key,
 
 			/* disable the authorisation key */
 			if (authkey)
-				key_revoke(authkey);
+				key_invalidate(authkey);
 
 			if (prep->expiry != TIME64_MAX) {
 				key->expiry = prep->expiry;
@@ -612,7 +612,7 @@ int key_reject_and_link(struct key *key,
 
 		/* disable the authorisation key */
 		if (authkey)
-			key_revoke(authkey);
+			key_invalidate(authkey);
 	}
 
 	mutex_unlock(&key_construction_mutex);
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 204b5a4d180e..e4de4070c754 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -831,7 +831,7 @@ found:
 }
 
 /**
- * keyring_search_aux - Search a keyring tree for a key matching some criteria
+ * keyring_search_rcu - Search a keyring tree for a matching key under RCU
  * @keyring_ref: A pointer to the keyring with possession indicator.
  * @ctx: The keyring search context.
  *
@@ -843,7 +843,9 @@ found:
  * addition, the LSM gets to forbid keyring searches and key matches.
  *
  * The search is performed as a breadth-then-depth search up to the prescribed
- * limit (KEYRING_SEARCH_MAX_DEPTH).
+ * limit (KEYRING_SEARCH_MAX_DEPTH).  The caller must hold the RCU read lock to
+ * prevent keyrings from being destroyed or rearranged whilst they are being
+ * searched.
  *
  * Keys are matched to the type provided and are then filtered by the match
  * function, which is given the description to use in any way it sees fit.  The
@@ -862,7 +864,7 @@ found:
  * In the case of a successful return, the possession attribute from
  * @keyring_ref is propagated to the returned key reference.
  */
-key_ref_t keyring_search_aux(key_ref_t keyring_ref,
+key_ref_t keyring_search_rcu(key_ref_t keyring_ref,
 			     struct keyring_search_context *ctx)
 {
 	struct key *keyring;
@@ -884,11 +886,9 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
 			return ERR_PTR(err);
 	}
 
-	rcu_read_lock();
 	ctx->now = ktime_get_real_seconds();
 	if (search_nested_keyrings(keyring, ctx))
 		__key_get(key_ref_to_ptr(ctx->result));
-	rcu_read_unlock();
 	return ctx->result;
 }
 
@@ -898,7 +898,7 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
  * @type: The type of keyring we want to find.
  * @description: The name of the keyring we want to find.
  *
- * As keyring_search_aux() above, but using the current task's credentials and
+ * As keyring_search_rcu() above, but using the current task's credentials and
  * type's default matching function and preferred search method.
  */
 key_ref_t keyring_search(key_ref_t keyring,
@@ -924,7 +924,9 @@ key_ref_t keyring_search(key_ref_t keyring,
 			return ERR_PTR(ret);
 	}
 
-	key = keyring_search_aux(keyring, &ctx);
+	rcu_read_lock();
+	key = keyring_search_rcu(keyring, &ctx);
+	rcu_read_unlock();
 
 	if (type->match_free)
 		type->match_free(&ctx.match_data);
diff --git a/security/keys/proc.c b/security/keys/proc.c
index 4e3266a2529e..7f15550c10f5 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -175,7 +175,9 @@ static int proc_keys_show(struct seq_file *m, void *v)
 	 * skip if the key does not indicate the possessor can view it
 	 */
 	if (key->perm & KEY_POS_VIEW) {
-		skey_ref = search_my_process_keyrings(&ctx);
+		rcu_read_lock();
+		skey_ref = search_cred_keyrings_rcu(&ctx);
+		rcu_read_unlock();
 		if (!IS_ERR(skey_ref)) {
 			key_ref_put(skey_ref);
 			key_ref = make_key_ref(key, 1);
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index a40b33614208..b99ad2c5342f 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -314,7 +314,8 @@ void key_fsgid_changed(struct cred *new_cred)
 
 /*
  * Search the process keyrings attached to the supplied cred for the first
- * matching key.
+ * matching key under RCU conditions (the caller must be holding the RCU read
+ * lock).
  *
  * The search criteria are the type and the match function.  The description is
  * given to the match function as a parameter, but doesn't otherwise influence
@@ -333,7 +334,7 @@ void key_fsgid_changed(struct cred *new_cred)
  * In the case of a successful return, the possession attribute is set on the
  * returned key reference.
  */
-key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx)
+key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx)
 {
 	key_ref_t key_ref, ret, err;
 	const struct cred *cred = ctx->cred;
@@ -351,7 +352,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx)
 
 	/* search the thread keyring first */
 	if (cred->thread_keyring) {
-		key_ref = keyring_search_aux(
+		key_ref = keyring_search_rcu(
 			make_key_ref(cred->thread_keyring, 1), ctx);
 		if (!IS_ERR(key_ref))
 			goto found;
@@ -369,7 +370,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx)
 
 	/* search the process keyring second */
 	if (cred->process_keyring) {
-		key_ref = keyring_search_aux(
+		key_ref = keyring_search_rcu(
 			make_key_ref(cred->process_keyring, 1), ctx);
 		if (!IS_ERR(key_ref))
 			goto found;
@@ -390,7 +391,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx)
 
 	/* search the session keyring */
 	if (cred->session_keyring) {
-		key_ref = keyring_search_aux(
+		key_ref = keyring_search_rcu(
 			make_key_ref(cred->session_keyring, 1), ctx);
 
 		if (!IS_ERR(key_ref))
@@ -411,7 +412,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx)
 	}
 	/* or search the user-session keyring */
 	else if (READ_ONCE(cred->user->session_keyring)) {
-		key_ref = keyring_search_aux(
+		key_ref = keyring_search_rcu(
 			make_key_ref(READ_ONCE(cred->user->session_keyring), 1),
 			ctx);
 		if (!IS_ERR(key_ref))
@@ -444,16 +445,16 @@ found:
  * the keys attached to the assumed authorisation key using its credentials if
  * one is available.
  *
- * Return same as search_my_process_keyrings().
+ * The caller must be holding the RCU read lock.
+ *
+ * Return same as search_cred_keyrings_rcu().
  */
-key_ref_t search_process_keyrings(struct keyring_search_context *ctx)
+key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx)
 {
 	struct request_key_auth *rka;
 	key_ref_t key_ref, ret = ERR_PTR(-EACCES), err;
 
-	might_sleep();
-
-	key_ref = search_my_process_keyrings(ctx);
+	key_ref = search_cred_keyrings_rcu(ctx);
 	if (!IS_ERR(key_ref))
 		goto found;
 	err = key_ref;
@@ -468,24 +469,17 @@ key_ref_t search_process_keyrings(struct keyring_search_context *ctx)
 	    ) {
 		const struct cred *cred = ctx->cred;
 
-		/* defend against the auth key being revoked */
-		down_read(&cred->request_key_auth->sem);
-
-		if (key_validate(ctx->cred->request_key_auth) == 0) {
+		if (key_validate(cred->request_key_auth) == 0) {
 			rka = ctx->cred->request_key_auth->payload.data[0];
 
+			//// was search_process_keyrings() [ie. recursive]
 			ctx->cred = rka->cred;
-			key_ref = search_process_keyrings(ctx);
+			key_ref = search_cred_keyrings_rcu(ctx);
 			ctx->cred = cred;
 
-			up_read(&cred->request_key_auth->sem);
-
 			if (!IS_ERR(key_ref))
 				goto found;
-
 			ret = key_ref;
-		} else {
-			up_read(&cred->request_key_auth->sem);
 		}
 	}
 
@@ -500,7 +494,6 @@ key_ref_t search_process_keyrings(struct keyring_search_context *ctx)
 found:
 	return key_ref;
 }
-
 /*
  * See if the key we're looking at is the target key.
  */
@@ -687,7 +680,9 @@ try_again:
 		ctx.index_key			= key->index_key;
 		ctx.match_data.raw_data		= key;
 		kdebug("check possessed");
-		skey_ref = search_process_keyrings(&ctx);
+		rcu_read_lock();
+		skey_ref = search_process_keyrings_rcu(&ctx);
+		rcu_read_unlock();
 		kdebug("possessed=%p", skey_ref);
 
 		if (!IS_ERR(skey_ref)) {
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index fcef7e26b94b..f2b4da143963 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -18,6 +18,31 @@
 
 #define key_negative_timeout	60	/* default timeout on a negative key's existence */
 
+static struct key *check_cached_key(struct keyring_search_context *ctx)
+{
+#ifdef CONFIG_KEYS_REQUEST_CACHE
+	struct key *key = current->cached_requested_key;
+
+	if (key &&
+	    ctx->match_data.cmp(key, &ctx->match_data) &&
+	    !(key->flags & ((1 << KEY_FLAG_INVALIDATED) |
+			    (1 << KEY_FLAG_REVOKED))))
+		return key_get(key);
+#endif
+	return NULL;
+}
+
+static void cache_requested_key(struct key *key)
+{
+#ifdef CONFIG_KEYS_REQUEST_CACHE
+	struct task_struct *t = current;
+
+	key_put(t->cached_requested_key);
+	t->cached_requested_key = key_get(key);
+	set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
+#endif
+}
+
 /**
  * complete_request_key - Complete the construction of a key.
  * @authkey: The authorisation key.
@@ -218,7 +243,7 @@ static int construct_key(struct key *key, const void *callout_info,
 	/* check that the actor called complete_request_key() prior to
 	 * returning an error */
 	WARN_ON(ret < 0 &&
-		!test_bit(KEY_FLAG_REVOKED, &authkey->flags));
+		!test_bit(KEY_FLAG_INVALIDATED, &authkey->flags));
 
 	key_put(authkey);
 	kleave(" = %d", ret);
@@ -381,7 +406,9 @@ static int construct_alloc_key(struct keyring_search_context *ctx,
 	 * waited for locks */
 	mutex_lock(&key_construction_mutex);
 
-	key_ref = search_process_keyrings(ctx);
+	rcu_read_lock();
+	key_ref = search_process_keyrings_rcu(ctx);
+	rcu_read_unlock();
 	if (!IS_ERR(key_ref))
 		goto key_already_present;
 
@@ -556,10 +583,26 @@ struct key *request_key_and_link(struct key_type *type,
 		}
 	}
 
+	key = check_cached_key(&ctx);
+	if (key)
+		return key;
+
 	/* search all the process keyrings for a key */
-	key_ref = search_process_keyrings(&ctx);
+	rcu_read_lock();
+	key_ref = search_process_keyrings_rcu(&ctx);
+	rcu_read_unlock();
 
 	if (!IS_ERR(key_ref)) {
+		if (dest_keyring) {
+			ret = key_task_permission(key_ref, current_cred(),
+						  KEY_NEED_LINK);
+			if (ret < 0) {
+				key_ref_put(key_ref);
+				key = ERR_PTR(ret);
+				goto error_free;
+			}
+		}
+
 		key = key_ref_to_ptr(key_ref);
 		if (dest_keyring) {
 			ret = key_link(dest_keyring, key);
@@ -569,6 +612,9 @@ struct key *request_key_and_link(struct key_type *type,
 				goto error_free;
 			}
 		}
+
+		/* Only cache the key on immediate success */
+		cache_requested_key(key);
 	} else if (PTR_ERR(key_ref) != -EAGAIN) {
 		key = ERR_CAST(key_ref);
 	} else  {
@@ -689,52 +735,51 @@ struct key *request_key_with_auxdata(struct key_type *type,
 }
 EXPORT_SYMBOL(request_key_with_auxdata);
 
-/*
- * request_key_async - Request a key (allow async construction)
- * @type: Type of key.
- * @description: The searchable description of the key.
- * @callout_info: The data to pass to the instantiation upcall (or NULL).
- * @callout_len: The length of callout_info.
+/**
+ * request_key_rcu - Request key from RCU-read-locked context
+ * @type: The type of key we want.
+ * @description: The name of the key we want.
  *
- * As for request_key_and_link() except that it does not add the returned key
- * to a keyring if found, new keys are always allocated in the user's quota and
- * no auxiliary data can be passed.
+ * Request a key from a context that we may not sleep in (such as RCU-mode
+ * pathwalk).  Keys under construction are ignored.
  *
- * The caller should call wait_for_key_construction() to wait for the
- * completion of the returned key if it is still undergoing construction.
+ * Return a pointer to the found key if successful, -ENOKEY if we couldn't find
+ * a key or some other error if the key found was unsuitable or inaccessible.
  */
-struct key *request_key_async(struct key_type *type,
-			      const char *description,
-			      const void *callout_info,
-			      size_t callout_len)
+struct key *request_key_rcu(struct key_type *type, const char *description)
 {
-	return request_key_and_link(type, description, callout_info,
-				    callout_len, NULL, NULL,
-				    KEY_ALLOC_IN_QUOTA);
-}
-EXPORT_SYMBOL(request_key_async);
+	struct keyring_search_context ctx = {
+		.index_key.type		= type,
+		.index_key.description	= description,
+		.index_key.desc_len	= strlen(description),
+		.cred			= current_cred(),
+		.match_data.cmp		= key_default_cmp,
+		.match_data.raw_data	= description,
+		.match_data.lookup_type	= KEYRING_SEARCH_LOOKUP_DIRECT,
+		.flags			= (KEYRING_SEARCH_DO_STATE_CHECK |
+					   KEYRING_SEARCH_SKIP_EXPIRED),
+	};
+	struct key *key;
+	key_ref_t key_ref;
 
-/*
- * request a key with auxiliary data for the upcaller (allow async construction)
- * @type: Type of key.
- * @description: The searchable description of the key.
- * @callout_info: The data to pass to the instantiation upcall (or NULL).
- * @callout_len: The length of callout_info.
- * @aux: Auxiliary data for the upcall.
- *
- * As for request_key_and_link() except that it does not add the returned key
- * to a keyring if found and new keys are always allocated in the user's quota.
- *
- * The caller should call wait_for_key_construction() to wait for the
- * completion of the returned key if it is still undergoing construction.
- */
-struct key *request_key_async_with_auxdata(struct key_type *type,
-					   const char *description,
-					   const void *callout_info,
-					   size_t callout_len,
-					   void *aux)
-{
-	return request_key_and_link(type, description, callout_info,
-				    callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA);
+	kenter("%s,%s", type->name, description);
+
+	key = check_cached_key(&ctx);
+	if (key)
+		return key;
+
+	/* search all the process keyrings for a key */
+	key_ref = search_process_keyrings_rcu(&ctx);
+	if (IS_ERR(key_ref)) {
+		key = ERR_CAST(key_ref);
+		if (PTR_ERR(key_ref) == -EAGAIN)
+			key = ERR_PTR(-ENOKEY);
+	} else {
+		key = key_ref_to_ptr(key_ref);
+		cache_requested_key(key);
+	}
+
+	kleave(" = %p", key);
+	return key;
 }
-EXPORT_SYMBOL(request_key_async_with_auxdata);
+EXPORT_SYMBOL(request_key_rcu);
diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 3d8616f981b2..5456c0c72857 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -54,7 +54,7 @@ static void request_key_auth_free_preparse(struct key_preparsed_payload *prep)
 static int request_key_auth_instantiate(struct key *key,
 					struct key_preparsed_payload *prep)
 {
-	key->payload.data[0] = (struct request_key_auth *)prep->data;
+	rcu_assign_keypointer(key, (struct request_key_auth *)prep->data);
 	return 0;
 }
 
@@ -64,7 +64,7 @@ static int request_key_auth_instantiate(struct key *key,
 static void request_key_auth_describe(const struct key *key,
 				      struct seq_file *m)
 {
-	struct request_key_auth *rka = get_request_key_auth(key);
+	struct request_key_auth *rka = dereference_key_rcu(key);
 
 	seq_puts(m, "key:");
 	seq_puts(m, key->description);
@@ -79,7 +79,7 @@ static void request_key_auth_describe(const struct key *key,
 static long request_key_auth_read(const struct key *key,
 				  char __user *buffer, size_t buflen)
 {
-	struct request_key_auth *rka = get_request_key_auth(key);
+	struct request_key_auth *rka = dereference_key_locked(key);
 	size_t datalen;
 	long ret;
 
@@ -98,23 +98,6 @@ static long request_key_auth_read(const struct key *key,
 	return ret;
 }
 
-/*
- * Handle revocation of an authorisation token key.
- *
- * Called with the key sem write-locked.
- */
-static void request_key_auth_revoke(struct key *key)
-{
-	struct request_key_auth *rka = get_request_key_auth(key);
-
-	kenter("{%d}", key->serial);
-
-	if (rka->cred) {
-		put_cred(rka->cred);
-		rka->cred = NULL;
-	}
-}
-
 static void free_request_key_auth(struct request_key_auth *rka)
 {
 	if (!rka)
@@ -128,15 +111,42 @@ static void free_request_key_auth(struct request_key_auth *rka)
 }
 
 /*
+ * Dispose of the request_key_auth record under RCU conditions
+ */
+static void request_key_auth_rcu_disposal(struct rcu_head *rcu)
+{
+	struct request_key_auth *rka =
+		container_of(rcu, struct request_key_auth, rcu);
+
+	free_request_key_auth(rka);
+}
+
+/*
+ * Handle revocation of an authorisation token key.
+ *
+ * Called with the key sem write-locked.
+ */
+static void request_key_auth_revoke(struct key *key)
+{
+	struct request_key_auth *rka = dereference_key_locked(key);
+
+	kenter("{%d}", key->serial);
+	rcu_assign_keypointer(key, NULL);
+	call_rcu(&rka->rcu, request_key_auth_rcu_disposal);
+}
+
+/*
  * Destroy an instantiation authorisation token key.
  */
 static void request_key_auth_destroy(struct key *key)
 {
-	struct request_key_auth *rka = get_request_key_auth(key);
+	struct request_key_auth *rka = rcu_access_pointer(key->payload.rcu_data0);
 
 	kenter("{%d}", key->serial);
-
-	free_request_key_auth(rka);
+	if (rka) {
+		rcu_assign_keypointer(key, NULL);
+		call_rcu(&rka->rcu, request_key_auth_rcu_disposal);
+	}
 }
 
 /*
@@ -245,7 +255,9 @@ struct key *key_get_instantiation_authkey(key_serial_t target_id)
 
 	ctx.index_key.desc_len = sprintf(description, "%x", target_id);
 
-	authkey_ref = search_process_keyrings(&ctx);
+	rcu_read_lock();
+	authkey_ref = search_process_keyrings_rcu(&ctx);
+	rcu_read_unlock();
 
 	if (IS_ERR(authkey_ref)) {
 		authkey = ERR_CAST(authkey_ref);