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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-04 18:49:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-04 18:49:34 -0700 |
| commit | 67bff7c087f91f79dfa97a33a3aeb147eb467093 (patch) | |
| tree | 6114aa6af653deee4b8098341c42ed3635b44c3f | |
| parent | 7572e56314a7e2568f7196862222b45cfb9d6eda (diff) | |
| parent | cf8304e8f380903de3a15dc6ebd551c9e6cf1a21 (diff) | |
| download | linux-67bff7c087f91f79dfa97a33a3aeb147eb467093.tar.bz2 | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
KEYS: Fix RCU handling in key_gc_keyring()
KEYS: Fix an RCU warning in the reading of user keys
| -rw-r--r-- | security/keys/gc.c | 9 | ||||
| -rw-r--r-- | security/keys/user_defined.c | 3 |
2 files changed, 8 insertions, 4 deletions
diff --git a/security/keys/gc.c b/security/keys/gc.c index 19902319d097..a46e825cbf02 100644 --- a/security/keys/gc.c +++ b/security/keys/gc.c @@ -77,10 +77,10 @@ static bool key_gc_keyring(struct key *keyring, time_t limit) goto dont_gc; /* scan the keyring looking for dead keys */ - klist = rcu_dereference_check(keyring->payload.subscriptions, - lockdep_is_held(&key_serial_lock)); + rcu_read_lock(); + klist = rcu_dereference(keyring->payload.subscriptions); if (!klist) - goto dont_gc; + goto unlock_dont_gc; for (loop = klist->nkeys - 1; loop >= 0; loop--) { key = klist->keys[loop]; @@ -89,11 +89,14 @@ static bool key_gc_keyring(struct key *keyring, time_t limit) goto do_gc; } +unlock_dont_gc: + rcu_read_unlock(); dont_gc: kleave(" = false"); return false; do_gc: + rcu_read_unlock(); key_gc_cursor = keyring->serial; key_get(keyring); spin_unlock(&key_serial_lock); diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c index 7c687d568221..e9aa07929656 100644 --- a/security/keys/user_defined.c +++ b/security/keys/user_defined.c @@ -199,7 +199,8 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen) struct user_key_payload *upayload; long ret; - upayload = rcu_dereference(key->payload.data); + upayload = rcu_dereference_protected( + key->payload.data, rwsem_is_locked(&((struct key *)key)->sem)); ret = upayload->datalen; /* we can return the data as is */ |