Zbigniew Jędrzejewski-Szmek
1a9e33aee3
prepare_socket_bind_bpf() is called from two sites: socket_bind_supported() and socket_bind_install_impl(). For the latter, when errors occur we certainly want to log, since they'll be fatal for the unit. But for the former, we should be quiet, at least on the "expected" errors like lack of permissions. I kept error on map resizing and such, which should not fail, at log_warning(). They are not fatal when called from socket_bind_suppported(), but still a sign that something is off. Currently BPF filters can only be used by privileged users. Thus each systemd --user will fail in socket_bind_supported(). With the patch, we only log this at debug level. https://lwn.net/ml/bpf/cover.1620499942.git.yifeifz2@illinois.edu/ gives some hope that unprivileged access will be possible, so let's keep the code trying. We might get lucky and get support for filters in user mode without any changes on our side.
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