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These two permission is absolutely required:
When the app starts to set up a tunnel, it seems to execute "cat /sys/module/wireguard/version" to check if wireguard kernel module is loaded or not. Despite the permission seems okay, without CAP_DAC_READ_SEARCH it could not read the version number and threw an error in the application log.
CAP_DAC_OVERRIDE is needed optionally for installing Wireguard command line tools. It could be turned back off once the binaries have been copied.