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KEYS: Flag dead keys to induce EKEYREVOKED [try #6]

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Set the KEY_FLAG_DEAD flag on keys for which the type has been removed.  This
causes the key_permission() function to return EKEYREVOKED in response to
various commands.  It does not, however, prevent unlinking or clearing of
keyrings from detaching the key.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells 2009-09-02 09:13:55 +01:00 committed by James Morris
parent 0c2c9a3fc7
commit f041ae2f99
1 changed files with 3 additions and 1 deletions
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4
security/keys/key.c
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@ -956,8 +956,10 @@ void unregister_key_type(struct key_type *ktype)
for (_n = rb_first(&key_serial_tree); _n; _n = rb_next(_n)) {
key = rb_entry(_n, struct key, serial_node);
if (key->type == ktype)
if (key->type == ktype) {
key->type = &key_type_dead;
set_bit(KEY_FLAG_DEAD, &key->flags);
}
}
spin_unlock(&key_serial_lock);