tree dc250270bd6fd4598e781559176e529d2c65b34d
parent 54dee406374ce8adb352c48e175176247cb8db7c
author Felipe Gasper <felipe@felipegasper.com> 1558399431 -0500
committer David S. Miller <davem@davemloft.net> 1558546595 -0700

net: Add UNIX_DIAG_UID to Netlink UNIX socket diagnostics.

This adds the ability for Netlink to report a socket's UID along with the
other UNIX diagnostic information that is already available. This will
allow diagnostic tools greater insight into which users control which
socket.

To test this, do the following as a non-root user:

    unshare -U -r bash
    nc -l -U user.socket.$$ &

.. and verify from within that same session that Netlink UNIX socket
diagnostics report the socket's UID as 0. Also verify that Netlink UNIX
socket diagnostics report the socket's UID as the user's UID from an
unprivileged process in a different session. Verify the same from
a root process.

Signed-off-by: Felipe Gasper <felipe@felipegasper.com>
Signed-off-by: David S. Miller <davem@davemloft.net>