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Diffstat (limited to 'security/keys/key.c')
-rw-r--r--security/keys/key.c94
1 files changed, 42 insertions, 52 deletions
diff --git a/security/keys/key.c b/security/keys/key.c
index 59402c843203..1fdfccb3fe43 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -294,7 +294,6 @@ struct key *key_alloc(struct key_type *type, const char *desc,
}
atomic_set(&key->usage, 1);
- rwlock_init(&key->lock);
init_rwsem(&key->sem);
key->type = type;
key->user = user;
@@ -308,7 +307,7 @@ struct key *key_alloc(struct key_type *type, const char *desc,
key->payload.data = NULL;
if (!not_in_quota)
- key->flags |= KEY_FLAG_IN_QUOTA;
+ key->flags |= 1 << KEY_FLAG_IN_QUOTA;
memset(&key->type_data, 0, sizeof(key->type_data));
@@ -359,7 +358,7 @@ int key_payload_reserve(struct key *key, size_t datalen)
key_check(key);
/* contemplate the quota adjustment */
- if (delta != 0 && key->flags & KEY_FLAG_IN_QUOTA) {
+ if (delta != 0 && test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
spin_lock(&key->user->lock);
if (delta > 0 &&
@@ -405,23 +404,17 @@ static int __key_instantiate_and_link(struct key *key,
down_write(&key_construction_sem);
/* can't instantiate twice */
- if (!(key->flags & KEY_FLAG_INSTANTIATED)) {
+ if (!test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) {
/* instantiate the key */
ret = key->type->instantiate(key, data, datalen);
if (ret == 0) {
/* mark the key as being instantiated */
- write_lock(&key->lock);
-
atomic_inc(&key->user->nikeys);
- key->flags |= KEY_FLAG_INSTANTIATED;
+ set_bit(KEY_FLAG_INSTANTIATED, &key->flags);
- if (key->flags & KEY_FLAG_USER_CONSTRUCT) {
- key->flags &= ~KEY_FLAG_USER_CONSTRUCT;
+ if (test_and_clear_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags))
awaken = 1;
- }
-
- write_unlock(&key->lock);
/* and link it into the destination keyring */
if (keyring)
@@ -486,21 +479,17 @@ int key_negate_and_link(struct key *key,
down_write(&key_construction_sem);
/* can't instantiate twice */
- if (!(key->flags & KEY_FLAG_INSTANTIATED)) {
+ if (!test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) {
/* mark the key as being negatively instantiated */
- write_lock(&key->lock);
-
atomic_inc(&key->user->nikeys);
- key->flags |= KEY_FLAG_INSTANTIATED | KEY_FLAG_NEGATIVE;
+ set_bit(KEY_FLAG_NEGATIVE, &key->flags);
+ set_bit(KEY_FLAG_INSTANTIATED, &key->flags);
now = current_kernel_time();
key->expiry = now.tv_sec + timeout;
- if (key->flags & KEY_FLAG_USER_CONSTRUCT) {
- key->flags &= ~KEY_FLAG_USER_CONSTRUCT;
+ if (test_and_clear_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags))
awaken = 1;
- }
- write_unlock(&key->lock);
ret = 0;
/* and link it into the destination keyring */
@@ -553,8 +542,10 @@ static void key_cleanup(void *data)
rb_erase(&key->serial_node, &key_serial_tree);
spin_unlock(&key_serial_lock);
+ key_check(key);
+
/* deal with the user's key tracking and quota */
- if (key->flags & KEY_FLAG_IN_QUOTA) {
+ if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) {
spin_lock(&key->user->lock);
key->user->qnkeys--;
key->user->qnbytes -= key->quotalen;
@@ -562,7 +553,7 @@ static void key_cleanup(void *data)
}
atomic_dec(&key->user->nkeys);
- if (key->flags & KEY_FLAG_INSTANTIATED)
+ if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags))
atomic_dec(&key->user->nikeys);
key_user_put(key->user);
@@ -631,9 +622,9 @@ struct key *key_lookup(key_serial_t id)
goto error;
found:
- /* pretent doesn't exist if it's dead */
+ /* pretend it doesn't exist if it's dead */
if (atomic_read(&key->usage) == 0 ||
- (key->flags & KEY_FLAG_DEAD) ||
+ test_bit(KEY_FLAG_DEAD, &key->flags) ||
key->type == &key_type_dead)
goto not_found;
@@ -708,12 +699,9 @@ static inline struct key *__key_update(struct key *key, const void *payload,
ret = key->type->update(key, payload, plen);
- if (ret == 0) {
+ if (ret == 0)
/* updating a negative key instantiates it */
- write_lock(&key->lock);
- key->flags &= ~KEY_FLAG_NEGATIVE;
- write_unlock(&key->lock);
- }
+ clear_bit(KEY_FLAG_NEGATIVE, &key->flags);
up_write(&key->sem);
@@ -841,12 +829,9 @@ int key_update(struct key *key, const void *payload, size_t plen)
down_write(&key->sem);
ret = key->type->update(key, payload, plen);
- if (ret == 0) {
+ if (ret == 0)
/* updating a negative key instantiates it */
- write_lock(&key->lock);
- key->flags &= ~KEY_FLAG_NEGATIVE;
- write_unlock(&key->lock);
- }
+ clear_bit(KEY_FLAG_NEGATIVE, &key->flags);
up_write(&key->sem);
}
@@ -892,10 +877,7 @@ struct key *key_duplicate(struct key *source, const char *desc)
goto error2;
atomic_inc(&key->user->nikeys);
-
- write_lock(&key->lock);
- key->flags |= KEY_FLAG_INSTANTIATED;
- write_unlock(&key->lock);
+ set_bit(KEY_FLAG_INSTANTIATED, &key->flags);
error_k:
up_read(&key_types_sem);
@@ -922,9 +904,7 @@ void key_revoke(struct key *key)
/* make sure no one's trying to change or use the key when we mark
* it */
down_write(&key->sem);
- write_lock(&key->lock);
- key->flags |= KEY_FLAG_REVOKED;
- write_unlock(&key->lock);
+ set_bit(KEY_FLAG_REVOKED, &key->flags);
up_write(&key->sem);
} /* end key_revoke() */
@@ -975,24 +955,33 @@ void unregister_key_type(struct key_type *ktype)
/* withdraw the key type */
list_del_init(&ktype->link);
- /* need to withdraw all keys of this type */
+ /* mark all the keys of this type dead */
spin_lock(&key_serial_lock);
for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
key = rb_entry(_n, struct key, serial_node);
- if (key->type != ktype)
- continue;
+ if (key->type == ktype)
+ key->type = &key_type_dead;
+ }
+
+ spin_unlock(&key_serial_lock);
+
+ /* make sure everyone revalidates their keys */
+ synchronize_kernel();
+
+ /* we should now be able to destroy the payloads of all the keys of
+ * this type with impunity */
+ spin_lock(&key_serial_lock);
- write_lock(&key->lock);
- key->type = &key_type_dead;
- write_unlock(&key->lock);
+ for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
+ key = rb_entry(_n, struct key, serial_node);
- /* there shouldn't be anyone looking at the description or
- * payload now */
- if (ktype->destroy)
- ktype->destroy(key);
- memset(&key->payload, 0xbd, sizeof(key->payload));
+ if (key->type == ktype) {
+ if (ktype->destroy)
+ ktype->destroy(key);
+ memset(&key->payload, 0xbd, sizeof(key->payload));
+ }
}
spin_unlock(&key_serial_lock);
@@ -1037,4 +1026,5 @@ void __init key_init(void)
/* link the two root keyrings together */
key_link(&root_session_keyring, &root_user_keyring);
+
} /* end key_init() */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 13:45:27 +0100