Linux-libre 4.1.5-gnupck-4.1.5-gnu

1 files changed, 28 insertions, 0 deletions

diff --git a/ipc/kdbus/endpoint.c b/ipc/kdbus/endpoint.c
index 977964dbb..44e7a20de 100644
--- a/ipc/kdbus/endpoint.c
+++ b/ipc/kdbus/endpoint.c
@@ -184,6 +184,34 @@ struct kdbus_ep *kdbus_ep_unref(struct kdbus_ep *ep)
 }
 
 /**
+ * kdbus_ep_is_privileged() - check whether a file is privileged
+ * @ep:		endpoint to operate on
+ * @file:	file to test
+ *
+ * Return: True if @file is privileged in the domain of @ep.
+ */
+bool kdbus_ep_is_privileged(struct kdbus_ep *ep, struct file *file)
+{
+	return !ep->user &&
+		file_ns_capable(file, ep->bus->domain->user_namespace,
+				CAP_IPC_OWNER);
+}
+
+/**
+ * kdbus_ep_is_owner() - check whether a file should be treated as bus owner
+ * @ep:		endpoint to operate on
+ * @file:	file to test
+ *
+ * Return: True if @file should be treated as bus owner on @ep
+ */
+bool kdbus_ep_is_owner(struct kdbus_ep *ep, struct file *file)
+{
+	return !ep->user &&
+		(uid_eq(file->f_cred->euid, ep->bus->node.uid) ||
+		 kdbus_ep_is_privileged(ep, file));
+}
+
+/**
  * kdbus_cmd_ep_make() - handle KDBUS_CMD_ENDPOINT_MAKE
  * @bus:		bus to operate on
  * @argp:		command payload