/lib/udev/rules.d/40-boinc-client.rules is in boinc-client 7.2.42+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | SUBSYSTEM=="kernel", DEVPATH=="/kernel/uids/*", ACTION=="add", RUN+="/usr/share/boinc-client/udev-cpu_share"
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