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security: Apply lockdep-based checking to rcu_dereference() uses 

Apply lockdep-ified RCU primitives to key_gc_keyring() and
keyring_destroy().

Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-12-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2010-02-22 17:04:56 -08:00 committed by Ingo Molnar
parent 96be753af9
commit e7b0a61b79
2 changed files with 5 additions and 2 deletions
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3
security/keys/gc.c
View File

@ -77,7 +77,8 @@ static bool key_gc_keyring(struct key *keyring, time_t limit)
goto dont_gc;
/* scan the keyring looking for dead keys */
klist = rcu_dereference(keyring->payload.subscriptions);
klist = rcu_dereference_check(keyring->payload.subscriptions,
lockdep_is_held(&key_serial_lock));
if (!klist)
goto dont_gc;

4
security/keys/keyring.c
View File

@ -151,7 +151,9 @@ static void keyring_destroy(struct key *keyring)
write_unlock(&keyring_name_lock);
}
klist = rcu_dereference(keyring->payload.subscriptions);
klist = rcu_dereference_check(keyring->payload.subscriptions,
rcu_read_lock_held() ||
atomic_read(&keyring->usage) == 0);
if (klist) {
for (loop = klist->nkeys - 1; loop >= 0; loop--)
key_put(klist->keys[loop]);