Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 1119 insertions, 0 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
new file mode 100644
index 000000000..37de37771
--- /dev/null
+++ b/crypto/algapi.c
@@ -0,0 +1,1119 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API for algorithms (i.e., low-level API).
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/algapi.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/fips.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+
+#include "internal.h"
+
+static LIST_HEAD(crypto_template_list);
+
+static inline void crypto_check_module_sig(struct module *mod)
+{
+	if (fips_enabled && mod && !module_sig_ok(mod))
+		panic("Module %s signature verification failed in FIPS mode\n",
+		      module_name(mod));
+}
+
+static int crypto_check_alg(struct crypto_alg *alg)
+{
+	crypto_check_module_sig(alg->cra_module);
+
+	if (!alg->cra_name[0] || !alg->cra_driver_name[0])
+		return -EINVAL;
+
+	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
+		return -EINVAL;
+
+	/* General maximums for all algs. */
+	if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
+		return -EINVAL;
+
+	if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
+		return -EINVAL;
+
+	/* Lower maximums for specific alg types. */
+	if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+			       CRYPTO_ALG_TYPE_CIPHER) {
+		if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
+			return -EINVAL;
+
+		if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
+			return -EINVAL;
+	}
+
+	if (alg->cra_priority < 0)
+		return -EINVAL;
+
+	refcount_set(&alg->cra_refcnt, 1);
+
+	return 0;
+}
+
+static void crypto_free_instance(struct crypto_instance *inst)
+{
+	inst->alg.cra_type->free(inst);
+}
+
+static void crypto_destroy_instance_workfn(struct work_struct *w)
+{
+	struct crypto_template *tmpl = container_of(w, struct crypto_template,
+						    free_work);
+	struct crypto_instance *inst;
+	struct hlist_node *n;
+	HLIST_HEAD(list);
+
+	down_write(&crypto_alg_sem);
+	hlist_for_each_entry_safe(inst, n, &tmpl->dead, list) {
+		if (refcount_read(&inst->alg.cra_refcnt) != -1)
+			continue;
+		hlist_del(&inst->list);
+		hlist_add_head(&inst->list, &list);
+	}
+	up_write(&crypto_alg_sem);
+
+	hlist_for_each_entry_safe(inst, n, &list, list)
+		crypto_free_instance(inst);
+}
+
+static void crypto_destroy_instance(struct crypto_alg *alg)
+{
+	struct crypto_instance *inst = container_of(alg,
+						    struct crypto_instance,
+						    alg);
+	struct crypto_template *tmpl = inst->tmpl;
+
+	refcount_set(&alg->cra_refcnt, -1);
+	schedule_work(&tmpl->free_work);
+}
+
+/*
+ * This function adds a spawn to the list secondary_spawns which
+ * will be used at the end of crypto_remove_spawns to unregister
+ * instances, unless the spawn happens to be one that is depended
+ * on by the new algorithm (nalg in crypto_remove_spawns).
+ *
+ * This function is also responsible for resurrecting any algorithms
+ * in the dependency chain of nalg by unsetting n->dead.
+ */
+static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
+					    struct list_head *stack,
+					    struct list_head *top,
+					    struct list_head *secondary_spawns)
+{
+	struct crypto_spawn *spawn, *n;
+
+	spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
+	if (!spawn)
+		return NULL;
+
+	n = list_prev_entry(spawn, list);
+	list_move(&spawn->list, secondary_spawns);
+
+	if (list_is_last(&n->list, stack))
+		return top;
+
+	n = list_next_entry(n, list);
+	if (!spawn->dead)
+		n->dead = false;
+
+	return &n->inst->alg.cra_users;
+}
+
+static void crypto_remove_instance(struct crypto_instance *inst,
+				   struct list_head *list)
+{
+	struct crypto_template *tmpl = inst->tmpl;
+
+	if (crypto_is_dead(&inst->alg))
+		return;
+
+	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
+
+	if (!tmpl)
+		return;
+
+	list_del_init(&inst->alg.cra_list);
+	hlist_del(&inst->list);
+	hlist_add_head(&inst->list, &tmpl->dead);
+
+	BUG_ON(!list_empty(&inst->alg.cra_users));
+
+	crypto_alg_put(&inst->alg);
+}
+
+/*
+ * Given an algorithm alg, remove all algorithms that depend on it
+ * through spawns.  If nalg is not null, then exempt any algorithms
+ * that is depended on by nalg.  This is useful when nalg itself
+ * depends on alg.
+ */
+void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
+			  struct crypto_alg *nalg)
+{
+	u32 new_type = (nalg ?: alg)->cra_flags;
+	struct crypto_spawn *spawn, *n;
+	LIST_HEAD(secondary_spawns);
+	struct list_head *spawns;
+	LIST_HEAD(stack);
+	LIST_HEAD(top);
+
+	spawns = &alg->cra_users;
+	list_for_each_entry_safe(spawn, n, spawns, list) {
+		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
+			continue;
+
+		list_move(&spawn->list, &top);
+	}
+
+	/*
+	 * Perform a depth-first walk starting from alg through
+	 * the cra_users tree.  The list stack records the path
+	 * from alg to the current spawn.
+	 */
+	spawns = &top;
+	do {
+		while (!list_empty(spawns)) {
+			struct crypto_instance *inst;
+
+			spawn = list_first_entry(spawns, struct crypto_spawn,
+						 list);
+			inst = spawn->inst;
+
+			list_move(&spawn->list, &stack);
+			spawn->dead = !spawn->registered || &inst->alg != nalg;
+
+			if (!spawn->registered)
+				break;
+
+			BUG_ON(&inst->alg == alg);
+
+			if (&inst->alg == nalg)
+				break;
+
+			spawns = &inst->alg.cra_users;
+
+			/*
+			 * Even if spawn->registered is true, the
+			 * instance itself may still be unregistered.
+			 * This is because it may have failed during
+			 * registration.  Therefore we still need to
+			 * make the following test.
+			 *
+			 * We may encounter an unregistered instance here, since
+			 * an instance's spawns are set up prior to the instance
+			 * being registered.  An unregistered instance will have
+			 * NULL ->cra_users.next, since ->cra_users isn't
+			 * properly initialized until registration.  But an
+			 * unregistered instance cannot have any users, so treat
+			 * it the same as ->cra_users being empty.
+			 */
+			if (spawns->next == NULL)
+				break;
+		}
+	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
+					      &secondary_spawns)));
+
+	/*
+	 * Remove all instances that are marked as dead.  Also
+	 * complete the resurrection of the others by moving them
+	 * back to the cra_users list.
+	 */
+	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
+		if (!spawn->dead)
+			list_move(&spawn->list, &spawn->alg->cra_users);
+		else if (spawn->registered)
+			crypto_remove_instance(spawn->inst, list);
+	}
+}
+EXPORT_SYMBOL_GPL(crypto_remove_spawns);
+
+static void crypto_alg_finish_registration(struct crypto_alg *alg,
+					   struct list_head *algs_to_put)
+	__must_hold(&crypto_alg_sem)
+{
+	struct crypto_alg *q;
+
+	list_for_each_entry(q, &crypto_alg_list, cra_list) {
+		if (q == alg)
+			continue;
+
+		if (crypto_is_moribund(q))
+			continue;
+
+		if (crypto_is_larval(q))
+			continue;
+
+		if (strcmp(alg->cra_name, q->cra_name))
+			continue;
+
+		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
+		    q->cra_priority > alg->cra_priority)
+			continue;
+
+		crypto_remove_spawns(q, algs_to_put, alg);
+	}
+
+	crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
+}
+
+static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
+{
+	struct crypto_larval *larval;
+
+	if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS) ||
+	    (alg->cra_flags & CRYPTO_ALG_INTERNAL))
+		return NULL; /* No self-test needed */
+
+	larval = crypto_larval_alloc(alg->cra_name,
+				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
+	if (IS_ERR(larval))
+		return larval;
+
+	larval->adult = crypto_mod_get(alg);
+	if (!larval->adult) {
+		kfree(larval);
+		return ERR_PTR(-ENOENT);
+	}
+
+	refcount_set(&larval->alg.cra_refcnt, 1);
+	memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
+	       CRYPTO_MAX_ALG_NAME);
+	larval->alg.cra_priority = alg->cra_priority;
+
+	return larval;
+}
+
+static struct crypto_larval *
+__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
+	__must_hold(&crypto_alg_sem)
+{
+	struct crypto_alg *q;
+	struct crypto_larval *larval;
+	int ret = -EAGAIN;
+
+	if (crypto_is_dead(alg))
+		goto err;
+
+	INIT_LIST_HEAD(&alg->cra_users);
+
+	ret = -EEXIST;
+
+	list_for_each_entry(q, &crypto_alg_list, cra_list) {
+		if (q == alg)
+			goto err;
+
+		if (crypto_is_moribund(q))
+			continue;
+
+		if (crypto_is_larval(q)) {
+			if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
+				goto err;
+			continue;
+		}
+
+		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
+		    !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
+		    !strcmp(q->cra_name, alg->cra_driver_name))
+			goto err;
+	}
+
+	larval = crypto_alloc_test_larval(alg);
+	if (IS_ERR(larval))
+		goto out;
+
+	list_add(&alg->cra_list, &crypto_alg_list);
+
+	if (larval) {
+		/* No cheating! */
+		alg->cra_flags &= ~CRYPTO_ALG_TESTED;
+
+		list_add(&larval->alg.cra_list, &crypto_alg_list);
+	} else {
+		alg->cra_flags |= CRYPTO_ALG_TESTED;
+		crypto_alg_finish_registration(alg, algs_to_put);
+	}
+
+out:
+	return larval;
+
+err:
+	larval = ERR_PTR(ret);
+	goto out;
+}
+
+void crypto_alg_tested(const char *name, int err)
+{
+	struct crypto_larval *test;
+	struct crypto_alg *alg;
+	struct crypto_alg *q;
+	LIST_HEAD(list);
+
+	down_write(&crypto_alg_sem);
+	list_for_each_entry(q, &crypto_alg_list, cra_list) {
+		if (crypto_is_moribund(q) || !crypto_is_larval(q))
+			continue;
+
+		test = (struct crypto_larval *)q;
+
+		if (!strcmp(q->cra_driver_name, name))
+			goto found;
+	}
+
+	pr_err("alg: Unexpected test result for %s: %d\n", name, err);
+	up_write(&crypto_alg_sem);
+	return;
+
+found:
+	q->cra_flags |= CRYPTO_ALG_DEAD;
+	alg = test->adult;
+
+	if (crypto_is_dead(alg))
+		goto complete;
+
+	if (err == -ECANCELED)
+		alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
+	else if (err)
+		goto complete;
+	else
+		alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
+
+	alg->cra_flags |= CRYPTO_ALG_TESTED;
+
+	crypto_alg_finish_registration(alg, &list);
+
+complete:
+	list_del_init(&test->alg.cra_list);
+	complete_all(&test->completion);
+
+	up_write(&crypto_alg_sem);
+
+	crypto_alg_put(&test->alg);
+	crypto_remove_final(&list);
+}
+EXPORT_SYMBOL_GPL(crypto_alg_tested);
+
+void crypto_remove_final(struct list_head *list)
+{
+	struct crypto_alg *alg;
+	struct crypto_alg *n;
+
+	list_for_each_entry_safe(alg, n, list, cra_list) {
+		list_del_init(&alg->cra_list);
+		crypto_alg_put(alg);
+	}
+}
+EXPORT_SYMBOL_GPL(crypto_remove_final);
+
+static void crypto_free_alg(struct crypto_alg *alg)
+{
+	unsigned int algsize = alg->cra_type->algsize;
+	u8 *p = (u8 *)alg - algsize;
+
+	crypto_destroy_alg(alg);
+	kfree(p);
+}
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+	struct crypto_larval *larval;
+	bool test_started = false;
+	LIST_HEAD(algs_to_put);
+	int err;
+
+	alg->cra_flags &= ~CRYPTO_ALG_DEAD;
+	err = crypto_check_alg(alg);
+	if (err)
+		return err;
+
+	if (alg->cra_flags & CRYPTO_ALG_DUP_FIRST &&
+	    !WARN_ON_ONCE(alg->cra_destroy)) {
+		unsigned int algsize = alg->cra_type->algsize;
+		u8 *p = (u8 *)alg - algsize;
+
+		p = kmemdup(p, algsize + sizeof(*alg), GFP_KERNEL);
+		if (!p)
+			return -ENOMEM;
+
+		alg = (void *)(p + algsize);
+		alg->cra_destroy = crypto_free_alg;
+	}
+
+	down_write(&crypto_alg_sem);
+	larval = __crypto_register_alg(alg, &algs_to_put);
+	if (!IS_ERR_OR_NULL(larval)) {
+		test_started = crypto_boot_test_finished();
+		larval->test_started = test_started;
+	}
+	up_write(&crypto_alg_sem);
+
+	if (IS_ERR(larval)) {
+		crypto_alg_put(alg);
+		return PTR_ERR(larval);
+	}
+
+	if (test_started)
+		crypto_schedule_test(larval);
+	else
+		crypto_remove_final(&algs_to_put);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_register_alg);
+
+static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
+{
+	if (unlikely(list_empty(&alg->cra_list)))
+		return -ENOENT;
+
+	alg->cra_flags |= CRYPTO_ALG_DEAD;
+
+	list_del_init(&alg->cra_list);
+	crypto_remove_spawns(alg, list, NULL);
+
+	return 0;
+}
+
+void crypto_unregister_alg(struct crypto_alg *alg)
+{
+	int ret;
+	LIST_HEAD(list);
+
+	down_write(&crypto_alg_sem);
+	ret = crypto_remove_alg(alg, &list);
+	up_write(&crypto_alg_sem);
+
+	if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
+		return;
+
+	WARN_ON(!alg->cra_destroy && refcount_read(&alg->cra_refcnt) != 1);
+
+	list_add(&alg->cra_list, &list);
+	crypto_remove_final(&list);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_alg);
+
+int crypto_register_algs(struct crypto_alg *algs, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		ret = crypto_register_alg(&algs[i]);
+		if (ret) {
+			crypto_unregister_algs(algs, i);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_register_algs);
+
+void crypto_unregister_algs(struct crypto_alg *algs, int count)
+{
+	int i;
+
+	for (i = count - 1; i >= 0; --i)
+		crypto_unregister_alg(&algs[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_algs);
+
+int crypto_register_template(struct crypto_template *tmpl)
+{
+	struct crypto_template *q;
+	int err = -EEXIST;
+
+	INIT_WORK(&tmpl->free_work, crypto_destroy_instance_workfn);
+
+	down_write(&crypto_alg_sem);
+
+	crypto_check_module_sig(tmpl->module);
+
+	list_for_each_entry(q, &crypto_template_list, list) {
+		if (q == tmpl)
+			goto out;
+	}
+
+	list_add(&tmpl->list, &crypto_template_list);
+	err = 0;
+out:
+	up_write(&crypto_alg_sem);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_register_template);
+
+int crypto_register_templates(struct crypto_template *tmpls, int count)
+{
+	int i, err;
+
+	for (i = 0; i < count; i++) {
+		err = crypto_register_template(&tmpls[i]);
+		if (err)
+			goto out;
+	}
+	return 0;
+
+out:
+	for (--i; i >= 0; --i)
+		crypto_unregister_template(&tmpls[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_register_templates);
+
+void crypto_unregister_template(struct crypto_template *tmpl)
+{
+	struct crypto_instance *inst;
+	struct hlist_node *n;
+	struct hlist_head *list;
+	LIST_HEAD(users);
+
+	down_write(&crypto_alg_sem);
+
+	BUG_ON(list_empty(&tmpl->list));
+	list_del_init(&tmpl->list);
+
+	list = &tmpl->instances;
+	hlist_for_each_entry(inst, list, list) {
+		int err = crypto_remove_alg(&inst->alg, &users);
+
+		BUG_ON(err);
+	}
+
+	up_write(&crypto_alg_sem);
+
+	hlist_for_each_entry_safe(inst, n, list, list) {
+		BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
+		crypto_free_instance(inst);
+	}
+	crypto_remove_final(&users);
+
+	flush_work(&tmpl->free_work);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_template);
+
+void crypto_unregister_templates(struct crypto_template *tmpls, int count)
+{
+	int i;
+
+	for (i = count - 1; i >= 0; --i)
+		crypto_unregister_template(&tmpls[i]);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_templates);
+
+static struct crypto_template *__crypto_lookup_template(const char *name)
+{
+	struct crypto_template *q, *tmpl = NULL;
+
+	down_read(&crypto_alg_sem);
+	list_for_each_entry(q, &crypto_template_list, list) {
+		if (strcmp(q->name, name))
+			continue;
+		if (unlikely(!crypto_tmpl_get(q)))
+			continue;
+
+		tmpl = q;
+		break;
+	}
+	up_read(&crypto_alg_sem);
+
+	return tmpl;
+}
+
+struct crypto_template *crypto_lookup_template(const char *name)
+{
+	return try_then_request_module(__crypto_lookup_template(name),
+				       "crypto-%s", name);
+}
+EXPORT_SYMBOL_GPL(crypto_lookup_template);
+
+int crypto_register_instance(struct crypto_template *tmpl,
+			     struct crypto_instance *inst)
+{
+	struct crypto_larval *larval;
+	struct crypto_spawn *spawn;
+	u32 fips_internal = 0;
+	LIST_HEAD(algs_to_put);
+	int err;
+
+	err = crypto_check_alg(&inst->alg);
+	if (err)
+		return err;
+
+	inst->alg.cra_module = tmpl->module;
+	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
+	inst->alg.cra_destroy = crypto_destroy_instance;
+
+	down_write(&crypto_alg_sem);
+
+	larval = ERR_PTR(-EAGAIN);
+	for (spawn = inst->spawns; spawn;) {
+		struct crypto_spawn *next;
+
+		if (spawn->dead)
+			goto unlock;
+
+		next = spawn->next;
+		spawn->inst = inst;
+		spawn->registered = true;
+
+		fips_internal |= spawn->alg->cra_flags;
+
+		crypto_mod_put(spawn->alg);
+
+		spawn = next;
+	}
+
+	inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
+
+	larval = __crypto_register_alg(&inst->alg, &algs_to_put);
+	if (IS_ERR(larval))
+		goto unlock;
+	else if (larval)
+		larval->test_started = true;
+
+	hlist_add_head(&inst->list, &tmpl->instances);
+	inst->tmpl = tmpl;
+
+unlock:
+	up_write(&crypto_alg_sem);
+
+	if (IS_ERR(larval))
+		return PTR_ERR(larval);
+
+	if (larval)
+		crypto_schedule_test(larval);
+	else
+		crypto_remove_final(&algs_to_put);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_register_instance);
+
+void crypto_unregister_instance(struct crypto_instance *inst)
+{
+	LIST_HEAD(list);
+
+	down_write(&crypto_alg_sem);
+
+	crypto_remove_spawns(&inst->alg, &list, NULL);
+	crypto_remove_instance(inst, &list);
+
+	up_write(&crypto_alg_sem);
+
+	crypto_remove_final(&list);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_instance);
+
+int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
+		      const char *name, u32 type, u32 mask)
+{
+	struct crypto_alg *alg;
+	int err = -EAGAIN;
+
+	if (WARN_ON_ONCE(inst == NULL))
+		return -EINVAL;
+
+	/* Allow the result of crypto_attr_alg_name() to be passed directly */
+	if (IS_ERR(name))
+		return PTR_ERR(name);
+
+	alg = crypto_find_alg(name, spawn->frontend,
+			      type | CRYPTO_ALG_FIPS_INTERNAL, mask);
+	if (IS_ERR(alg))
+		return PTR_ERR(alg);
+
+	down_write(&crypto_alg_sem);
+	if (!crypto_is_moribund(alg)) {
+		list_add(&spawn->list, &alg->cra_users);
+		spawn->alg = alg;
+		spawn->mask = mask;
+		spawn->next = inst->spawns;
+		inst->spawns = spawn;
+		inst->alg.cra_flags |=
+			(alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
+		err = 0;
+	}
+	up_write(&crypto_alg_sem);
+	if (err)
+		crypto_mod_put(alg);
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_grab_spawn);
+
+void crypto_drop_spawn(struct crypto_spawn *spawn)
+{
+	if (!spawn->alg) /* not yet initialized? */
+		return;
+
+	down_write(&crypto_alg_sem);
+	if (!spawn->dead)
+		list_del(&spawn->list);
+	up_write(&crypto_alg_sem);
+
+	if (!spawn->registered)
+		crypto_mod_put(spawn->alg);
+}
+EXPORT_SYMBOL_GPL(crypto_drop_spawn);
+
+static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
+{
+	struct crypto_alg *alg = ERR_PTR(-EAGAIN);
+	struct crypto_alg *target;
+	bool shoot = false;
+
+	down_read(&crypto_alg_sem);
+	if (!spawn->dead) {
+		alg = spawn->alg;
+		if (!crypto_mod_get(alg)) {
+			target = crypto_alg_get(alg);
+			shoot = true;
+			alg = ERR_PTR(-EAGAIN);
+		}
+	}
+	up_read(&crypto_alg_sem);
+
+	if (shoot) {
+		crypto_shoot_alg(target);
+		crypto_alg_put(target);
+	}
+
+	return alg;
+}
+
+struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
+				    u32 mask)
+{
+	struct crypto_alg *alg;
+	struct crypto_tfm *tfm;
+
+	alg = crypto_spawn_alg(spawn);
+	if (IS_ERR(alg))
+		return ERR_CAST(alg);
+
+	tfm = ERR_PTR(-EINVAL);
+	if (unlikely((alg->cra_flags ^ type) & mask))
+		goto out_put_alg;
+
+	tfm = __crypto_alloc_tfm(alg, type, mask);
+	if (IS_ERR(tfm))
+		goto out_put_alg;
+
+	return tfm;
+
+out_put_alg:
+	crypto_mod_put(alg);
+	return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
+
+void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
+{
+	struct crypto_alg *alg;
+	struct crypto_tfm *tfm;
+
+	alg = crypto_spawn_alg(spawn);
+	if (IS_ERR(alg))
+		return ERR_CAST(alg);
+
+	tfm = crypto_create_tfm(alg, spawn->frontend);
+	if (IS_ERR(tfm))
+		goto out_put_alg;
+
+	return tfm;
+
+out_put_alg:
+	crypto_mod_put(alg);
+	return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
+
+int crypto_register_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&crypto_chain, nb);
+}
+EXPORT_SYMBOL_GPL(crypto_register_notifier);
+
+int crypto_unregister_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&crypto_chain, nb);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
+
+struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
+{
+	struct rtattr *rta = tb[0];
+	struct crypto_attr_type *algt;
+
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*algt))
+		return ERR_PTR(-EINVAL);
+	if (rta->rta_type != CRYPTOA_TYPE)
+		return ERR_PTR(-EINVAL);
+
+	algt = RTA_DATA(rta);
+
+	return algt;
+}
+EXPORT_SYMBOL_GPL(crypto_get_attr_type);
+
+/**
+ * crypto_check_attr_type() - check algorithm type and compute inherited mask
+ * @tb: the template parameters
+ * @type: the algorithm type the template would be instantiated as
+ * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
+ *	      to restrict the flags of any inner algorithms
+ *
+ * Validate that the algorithm type the user requested is compatible with the
+ * one the template would actually be instantiated as.  E.g., if the user is
+ * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
+ * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
+ *
+ * Also compute the mask to use to restrict the flags of any inner algorithms.
+ *
+ * Return: 0 on success; -errno on failure
+ */
+int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
+{
+	struct crypto_attr_type *algt;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	if ((algt->type ^ type) & algt->mask)
+		return -EINVAL;
+
+	*mask_ret = crypto_algt_inherited_mask(algt);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_check_attr_type);
+
+const char *crypto_attr_alg_name(struct rtattr *rta)
+{
+	struct crypto_attr_alg *alga;
+
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*alga))
+		return ERR_PTR(-EINVAL);
+	if (rta->rta_type != CRYPTOA_ALG)
+		return ERR_PTR(-EINVAL);
+
+	alga = RTA_DATA(rta);
+	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
+
+	return alga->name;
+}
+EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
+
+int __crypto_inst_setname(struct crypto_instance *inst, const char *name,
+			  const char *driver, struct crypto_alg *alg)
+{
+	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
+		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
+		     driver, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+		return -ENAMETOOLONG;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__crypto_inst_setname);
+
+void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
+{
+	INIT_LIST_HEAD(&queue->list);
+	queue->backlog = &queue->list;
+	queue->qlen = 0;
+	queue->max_qlen = max_qlen;
+}
+EXPORT_SYMBOL_GPL(crypto_init_queue);
+
+int crypto_enqueue_request(struct crypto_queue *queue,
+			   struct crypto_async_request *request)
+{
+	int err = -EINPROGRESS;
+
+	if (unlikely(queue->qlen >= queue->max_qlen)) {
+		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+			err = -ENOSPC;
+			goto out;
+		}
+		err = -EBUSY;
+		if (queue->backlog == &queue->list)
+			queue->backlog = &request->list;
+	}
+
+	queue->qlen++;
+	list_add_tail(&request->list, &queue->list);
+
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(crypto_enqueue_request);
+
+void crypto_enqueue_request_head(struct crypto_queue *queue,
+				 struct crypto_async_request *request)
+{
+	if (unlikely(queue->qlen >= queue->max_qlen))
+		queue->backlog = queue->backlog->prev;
+
+	queue->qlen++;
+	list_add(&request->list, &queue->list);
+}
+EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
+
+struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
+{
+	struct list_head *request;
+
+	if (unlikely(!queue->qlen))
+		return NULL;
+
+	queue->qlen--;
+
+	if (queue->backlog != &queue->list)
+		queue->backlog = queue->backlog->next;
+
+	request = queue->list.next;
+	list_del_init(request);
+
+	return list_entry(request, struct crypto_async_request, list);
+}
+EXPORT_SYMBOL_GPL(crypto_dequeue_request);
+
+static inline void crypto_inc_byte(u8 *a, unsigned int size)
+{
+	u8 *b = (a + size);
+	u8 c;
+
+	for (; size; size--) {
+		c = *--b + 1;
+		*b = c;
+		if (c)
+			break;
+	}
+}
+
+void crypto_inc(u8 *a, unsigned int size)
+{
+	__be32 *b = (__be32 *)(a + size);
+	u32 c;
+
+	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+	    IS_ALIGNED((unsigned long)b, __alignof__(*b)))
+		for (; size >= 4; size -= 4) {
+			c = be32_to_cpu(*--b) + 1;
+			*b = cpu_to_be32(c);
+			if (likely(c))
+				return;
+		}
+
+	crypto_inc_byte(a, size);
+}
+EXPORT_SYMBOL_GPL(crypto_inc);
+
+unsigned int crypto_alg_extsize(struct crypto_alg *alg)
+{
+	return alg->cra_ctxsize +
+	       (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+}
+EXPORT_SYMBOL_GPL(crypto_alg_extsize);
+
+int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
+			u32 type, u32 mask)
+{
+	int ret = 0;
+	struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
+
+	if (!IS_ERR(alg)) {
+		crypto_mod_put(alg);
+		ret = 1;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_type_has_alg);
+
+static void __init crypto_start_tests(void)
+{
+	if (!IS_BUILTIN(CONFIG_CRYPTO_ALGAPI))
+		return;
+
+	if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS))
+		return;
+
+	set_crypto_boot_test_finished();
+
+	for (;;) {
+		struct crypto_larval *larval = NULL;
+		struct crypto_alg *q;
+
+		down_write(&crypto_alg_sem);
+
+		list_for_each_entry(q, &crypto_alg_list, cra_list) {
+			struct crypto_larval *l;
+
+			if (!crypto_is_larval(q))
+				continue;
+
+			l = (void *)q;
+
+			if (!crypto_is_test_larval(l))
+				continue;
+
+			if (l->test_started)
+				continue;
+
+			l->test_started = true;
+			larval = l;
+			break;
+		}
+
+		up_write(&crypto_alg_sem);
+
+		if (!larval)
+			break;
+
+		crypto_schedule_test(larval);
+	}
+}
+
+static int __init crypto_algapi_init(void)
+{
+	crypto_init_proc();
+	crypto_start_tests();
+	return 0;
+}
+
+static void __exit crypto_algapi_exit(void)
+{
+	crypto_exit_proc();
+}
+
+/*
+ * We run this at late_initcall so that all the built-in algorithms
+ * have had a chance to register themselves first.
+ */
+late_initcall(crypto_algapi_init);
+module_exit(crypto_algapi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cryptographic algorithms API");
+MODULE_SOFTDEP("pre: cryptomgr");