KEYS: Move the unreferenced key reaper to the keys garbage collector file
Move the unreferenced key reaper function to the keys garbage collector file as that's a more appropriate place with the dead key link reaper. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells
James Morris
parent
012146d072
commit
8bc16deabc
3 changed files with 85 additions and 76 deletions
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@ -10,6 +10,8 @@
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/security.h>
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#include <keys/keyring-type.h>
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#include "internal.h"
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@ -19,12 +21,18 @@
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unsigned key_gc_delay = 5 * 60;
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/*
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* Reaper
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* Reaper for unused keys.
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*/
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static void key_gc_unused_keys(struct work_struct *work);
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DECLARE_WORK(key_gc_unused_work, key_gc_unused_keys);
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/*
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* Reaper for links from keyrings to dead keys.
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*/
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static void key_gc_timer_func(unsigned long);
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static void key_garbage_collector(struct work_struct *);
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static void key_gc_dead_links(struct work_struct *);
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static DEFINE_TIMER(key_gc_timer, key_gc_timer_func, 0, 0);
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static DECLARE_WORK(key_gc_work, key_garbage_collector);
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static DECLARE_WORK(key_gc_work, key_gc_dead_links);
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static key_serial_t key_gc_cursor; /* the last key the gc considered */
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static bool key_gc_again;
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static unsigned long key_gc_executing;
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@ -108,10 +116,12 @@ do_gc:
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}
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/*
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* Garbage collector for keys. This involves scanning the keyrings for dead,
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* expired and revoked keys that have overstayed their welcome
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* Garbage collector for links to dead keys.
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*
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* This involves scanning the keyrings for dead, expired and revoked keys that
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* have overstayed their welcome
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*/
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static void key_garbage_collector(struct work_struct *work)
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static void key_gc_dead_links(struct work_struct *work)
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{
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struct rb_node *rb;
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key_serial_t cursor;
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@ -220,3 +230,68 @@ reached_the_end:
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}
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kleave(" [end]");
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}
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/*
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* Garbage collector for unused keys.
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*
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* This is done in process context so that we don't have to disable interrupts
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* all over the place. key_put() schedules this rather than trying to do the
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* cleanup itself, which means key_put() doesn't have to sleep.
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*/
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static void key_gc_unused_keys(struct work_struct *work)
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{
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struct rb_node *_n;
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struct key *key;
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go_again:
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/* look for a dead key in the tree */
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spin_lock(&key_serial_lock);
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for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
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key = rb_entry(_n, struct key, serial_node);
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if (atomic_read(&key->usage) == 0)
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goto found_dead_key;
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}
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spin_unlock(&key_serial_lock);
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return;
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found_dead_key:
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/* we found a dead key - once we've removed it from the tree, we can
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* drop the lock */
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rb_erase(&key->serial_node, &key_serial_tree);
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spin_unlock(&key_serial_lock);
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key_check(key);
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security_key_free(key);
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/* deal with the user's key tracking and quota */
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if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
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spin_lock(&key->user->lock);
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key->user->qnkeys--;
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key->user->qnbytes -= key->quotalen;
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spin_unlock(&key->user->lock);
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}
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atomic_dec(&key->user->nkeys);
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if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
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atomic_dec(&key->user->nikeys);
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key_user_put(key->user);
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/* now throw away the key memory */
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if (key->type->destroy)
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key->type->destroy(key);
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kfree(key->description);
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#ifdef KEY_DEBUGGING
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key->magic = KEY_DEBUG_MAGIC_X;
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#endif
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kmem_cache_free(key_jar, key);
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/* there may, of course, be more than one key to destroy */
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goto go_again;
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}
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@ -75,6 +75,7 @@ extern unsigned key_quota_maxbytes;
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#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
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extern struct kmem_cache *key_jar;
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extern struct rb_root key_serial_tree;
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extern spinlock_t key_serial_lock;
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extern struct mutex key_construction_mutex;
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@ -146,6 +147,7 @@ extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
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extern long join_session_keyring(const char *name);
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extern struct work_struct key_gc_unused_work;
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extern unsigned key_gc_delay;
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extern void keyring_gc(struct key *keyring, time_t limit);
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extern void key_schedule_gc(time_t expiry_at);
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@ -21,7 +21,7 @@
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#include <linux/user_namespace.h>
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#include "internal.h"
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static struct kmem_cache *key_jar;
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struct kmem_cache *key_jar;
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struct rb_root key_serial_tree; /* tree of keys indexed by serial */
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DEFINE_SPINLOCK(key_serial_lock);
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@ -36,9 +36,6 @@ unsigned int key_quota_maxbytes = 20000; /* general key space quota */
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static LIST_HEAD(key_types_list);
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static DECLARE_RWSEM(key_types_sem);
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static void key_cleanup(struct work_struct *work);
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static DECLARE_WORK(key_cleanup_task, key_cleanup);
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/* We serialise key instantiation and link */
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DEFINE_MUTEX(key_construction_mutex);
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@ -591,71 +588,6 @@ int key_reject_and_link(struct key *key,
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}
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EXPORT_SYMBOL(key_reject_and_link);
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/*
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* Garbage collect keys in process context so that we don't have to disable
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* interrupts all over the place.
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*
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* key_put() schedules this rather than trying to do the cleanup itself, which
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* means key_put() doesn't have to sleep.
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*/
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static void key_cleanup(struct work_struct *work)
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{
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struct rb_node *_n;
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struct key *key;
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go_again:
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/* look for a dead key in the tree */
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spin_lock(&key_serial_lock);
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for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
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key = rb_entry(_n, struct key, serial_node);
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if (atomic_read(&key->usage) == 0)
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goto found_dead_key;
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}
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spin_unlock(&key_serial_lock);
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return;
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found_dead_key:
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/* we found a dead key - once we've removed it from the tree, we can
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* drop the lock */
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rb_erase(&key->serial_node, &key_serial_tree);
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spin_unlock(&key_serial_lock);
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key_check(key);
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security_key_free(key);
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/* deal with the user's key tracking and quota */
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if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
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spin_lock(&key->user->lock);
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key->user->qnkeys--;
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key->user->qnbytes -= key->quotalen;
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spin_unlock(&key->user->lock);
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}
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atomic_dec(&key->user->nkeys);
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if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
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atomic_dec(&key->user->nikeys);
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key_user_put(key->user);
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/* now throw away the key memory */
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if (key->type->destroy)
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key->type->destroy(key);
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kfree(key->description);
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#ifdef KEY_DEBUGGING
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key->magic = KEY_DEBUG_MAGIC_X;
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#endif
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kmem_cache_free(key_jar, key);
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/* there may, of course, be more than one key to destroy */
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goto go_again;
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}
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/**
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* key_put - Discard a reference to a key.
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* @key: The key to discard a reference from.
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@ -670,7 +602,7 @@ void key_put(struct key *key)
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key_check(key);
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if (atomic_dec_and_test(&key->usage))
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schedule_work(&key_cleanup_task);
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schedule_work(&key_gc_unused_work);
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}
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}
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EXPORT_SYMBOL(key_put);
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