[PATCH 10/11] selinux: Implement the watch_key security hook [ver #6]

[David Howells <dhowells@redhat.com>]

Implement the watch_key security hook to make sure that a key grants the
caller View permission in order to set a watch on a key.

For the moment, the watch_devices security hook is left unimplemented as
it's not obvious what the object should be since the queue is global and
didn't previously exist.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 security/selinux/hooks.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 74dd46de01b6..371f2ebc879b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6533,6 +6533,20 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
 	*_buffer = context;
 	return rc;
 }
+
+#ifdef CONFIG_KEY_NOTIFICATIONS
+static int selinux_watch_key(struct watch *watch, struct key *key)
+{
+	struct key_security_struct *ksec;
+	u32 sid;
+
+	sid = cred_sid(watch->cred);
+	ksec = key->security;
+
+	return avc_has_perm(&selinux_state,
+			    sid, ksec->sid, SECCLASS_KEY, KEY_NEED_VIEW, NULL);
+}
+#endif
 #endif
 
 #ifdef CONFIG_SECURITY_INFINIBAND
@@ -6965,6 +6979,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(key_free, selinux_key_free),
 	LSM_HOOK_INIT(key_permission, selinux_key_permission),
 	LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
+#ifdef CONFIG_KEY_NOTIFICATIONS
+	LSM_HOOK_INIT(watch_key, selinux_watch_key),
+#endif
 #endif
 
 #ifdef CONFIG_AUDIT