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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-22 17:04:56 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-25 10:34:52 +0100 |
| commit | e7b0a61b7929632d36cf052d9e2820ef0a9c1bfe (patch) | |
| tree | 69dbe6f03abc5a9ef0dea3a2c28921cebcc59a08 /security/keys | |
| parent | 96be753af91fc9d582450a84722f6a6721d218ad (diff) | |
| download | linux-e7b0a61b7929632d36cf052d9e2820ef0a9c1bfe.tar.gz linux-e7b0a61b7929632d36cf052d9e2820ef0a9c1bfe.tar.bz2 linux-e7b0a61b7929632d36cf052d9e2820ef0a9c1bfe.zip | |
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>
Diffstat (limited to 'security/keys')
| -rw-r--r-- | security/keys/gc.c | 3 | ||||
| -rw-r--r-- | security/keys/keyring.c | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/security/keys/gc.c b/security/keys/gc.c index 4770be375ffe..19902319d097 100644 --- a/security/keys/gc.c +++ b/security/keys/gc.c @@ -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; diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 8ec02746ca99..e814d2109f8e 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -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]); |