Export receive_fd() so that some modules can use
it to pass file descriptor between processes without
missing any security stuffs.
Signed-off-by: NXie Yongji <xieyongji@bytedance.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210831103634.33-4-xieyongji@bytedance.comSigned-off-by: NMichael S. Tsirkin <mst@redhat.com>