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KEYS: Give key types their own lockdep class for key->sem 

Give keys their own lockdep class to differentiate them from each other in case
a key of one type has to refer to a key of another type.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells 2011-11-16 11:15:54 +00:00 committed by James Morris
parent 24942c8e5c
commit 7845bc3964
2 changed files with 4 additions and 0 deletions
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1
include/linux/key-type.h
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@ -92,6 +92,7 @@ struct key_type {
/* internal fields */
struct list_head link; /* link in types list */
struct lock_class_key lock_class; /* key->sem lock class */
};
extern struct key_type key_type_keyring;

3
security/keys/key.c
View File

@ -291,6 +291,7 @@ struct key *key_alloc(struct key_type *type, const char *desc,
atomic_set(&key->usage, 1);
init_rwsem(&key->sem);
lockdep_set_class(&key->sem, &type->lock_class);
key->type = type;
key->user = user;
key->quotalen = quotalen;
@ -946,6 +947,8 @@ int register_key_type(struct key_type *ktype)
struct key_type *p;
int ret;
memset(&ktype->lock_class, 0, sizeof(ktype->lock_class));
ret = -EEXIST;
down_write(&key_types_sem);