This file is indexed.

/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf is in wpasupplicant 2:2.6-15ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Certain drivers are known not to support changing the MAC address.
# Disable touching the MAC address on such devices.
#
# See man NetworkManager.conf
#
# https://bugzilla.gnome.org/show_bug.cgi?id=777523

[device-mac-addr-change-wifi]
match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
wifi.cloned-mac-address=preserve
ethernet.cloned-mac-address=preserve