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authorDavid Howells <dhowells@redhat.com>2006-06-26 09:24:51 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 18:58:18 +0200
commit31204ed925b067d2bb65adb89501656f8274a32a (patch)
treea5c3e5101e9f79bf39672f02c0eea573e7a47cb8 /security/keys/user_defined.c
parent[PATCH] keys: sort out key quota system (diff)
downloadlinux-31204ed925b067d2bb65adb89501656f8274a32a.tar.xz
linux-31204ed925b067d2bb65adb89501656f8274a32a.zip
[PATCH] keys: discard the contents of a key on revocation
Cause the keys linked to a keyring to be unlinked from it when revoked and it causes the data attached to a user-defined key to be discarded when revoked. This frees up most of the quota a key occupied at that point, rather than waiting for the key to actually be destroyed. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/keys/user_defined.c')
-rw-r--r--security/keys/user_defined.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 8e71895b97a7..5bbfdebb7acf 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -28,6 +28,7 @@ struct key_type key_type_user = {
.instantiate = user_instantiate,
.update = user_update,
.match = user_match,
+ .revoke = user_revoke,
.destroy = user_destroy,
.describe = user_describe,
.read = user_read,
@@ -67,6 +68,7 @@ error:
return ret;
} /* end user_instantiate() */
+
EXPORT_SYMBOL_GPL(user_instantiate);
/*****************************************************************************/
@@ -141,7 +143,28 @@ EXPORT_SYMBOL_GPL(user_match);
/*****************************************************************************/
/*
- * dispose of the data dangling from the corpse of a user
+ * dispose of the links from a revoked keyring
+ * - called with the key sem write-locked
+ */
+void user_revoke(struct key *key)
+{
+ struct user_key_payload *upayload = key->payload.data;
+
+ /* clear the quota */
+ key_payload_reserve(key, 0);
+
+ if (upayload) {
+ rcu_assign_pointer(key->payload.data, NULL);
+ call_rcu(&upayload->rcu, user_update_rcu_disposal);
+ }
+
+} /* end user_revoke() */
+
+EXPORT_SYMBOL(user_revoke);
+
+/*****************************************************************************/
+/*
+ * dispose of the data dangling from the corpse of a user key
*/
void user_destroy(struct key *key)
{