These are normal objects used by both userspace programs and the kernel. For them to be used by the kernel, the use permission must be set. To learn more about the use permission, see Permissions.
A security context is an object that contains information about which objects can be accessed and how (such as managing capabilities). A thread attaches to the security context to gain access to the objects. This can be useful for operations similar to the
sudo command on UNIX, where privileges are temporarily increased in order to perform certain privileged operations without fully changing user ID.
Additionally, security contexts can be used to limit permissions. To prevent a limited thread from shedding their limited permission state, attached contexts can be set as undetachable.