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keys: Hoist locking out of __key_link_begin()

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Hoist the locking of out of __key_link_begin() and into its callers.  This
is necessary to allow the upcoming key_move() operation to correctly order
taking of the source keyring semaphore, the destination keyring semaphore
and the keyring serialisation lock.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-05-30 11:37:39 +01:00
parent eb0f68cb70
commit df593ee23e
4 changed files with 77 additions and 39 deletions
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security/keys/internal.h
+2
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@@ -93,6 +93,8 @@ extern wait_queue_head_t request_key_conswq;
extern struct key_type *key_type_lookup(const char *type);
extern void key_type_put(struct key_type *ktype);
extern int __key_link_lock(struct key *keyring,
const struct keyring_index_key *index_key);
extern int __key_link_begin(struct key *keyring,
const struct keyring_index_key *index_key,
struct assoc_array_edit **_edit);