keys: Garbage collect keys for which the domain has been removed
If a key operation domain (such as a network namespace) has been removed
then attempt to garbage collect all the keys that use it.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/security/keys/internal.h b/security/keys/internal.h
index d3a9439..5a561f5 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -209,7 +209,8 @@ static inline bool key_is_dead(const struct key *key, time64_t limit)
return
key->flags & ((1 << KEY_FLAG_DEAD) |
(1 << KEY_FLAG_INVALIDATED)) ||
- (key->expiry > 0 && key->expiry <= limit);
+ (key->expiry > 0 && key->expiry <= limit) ||
+ key->domain_tag->removed;
}
/*
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 0da8fa2..d3c86fd 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -241,6 +241,21 @@ bool key_put_tag(struct key_tag *tag)
return false;
}
+/**
+ * key_remove_domain - Kill off a key domain and gc its keys
+ * @domain_tag: The domain tag to release.
+ *
+ * This marks a domain tag as being dead and releases a ref on it. If that
+ * wasn't the last reference, the garbage collector is poked to try and delete
+ * all keys that were in the domain.
+ */
+void key_remove_domain(struct key_tag *domain_tag)
+{
+ domain_tag->removed = true;
+ if (!key_put_tag(domain_tag))
+ key_schedule_gc_links();
+}
+
/*
* Build the next index key chunk.
*