Public bug reported: Hello everyone,
I noticed a strange systemd warning in my kernel log about "Proceeding WITHOUT firewalling in effect!" There is an older Debian bug mention about this same issue and it is said there that it was fixed last year: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=872560 Release: Ubuntu 19.10, fresh install, latest updates with updates-testing repository enabled Systemd-package version: 242-7ubuntu3 Kernel: Linux 5.3.0-21-generic Here is the relevant warning information via running sudo dmesg after boot: [ 2.096064] Lockdown: systemd: /dev/mem,kmem,port is restricted; see man kernel_lockdown.7 [ 2.101034] Lockdown: systemd: BPF is restricted; see man kernel_lockdown.7 [ 2.136885] systemd[1]: File /lib/systemd/system/systemd-journald.service:12 configures an IP firewall (IPAddressDeny=any), but the local system does not support BPF/cgroup based firewalling. [ 2.142209] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.) [ 2.158190] systemd[1]: /lib/systemd/system/dbus.socket:4: ListenStream= references a path below legacy directory /var/run/, updating /var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please update the unit file accordingly. [ 2.197029] systemd[1]: Listening on Journal Socket. [ 2.203708] systemd[1]: Starting Create list of required static device nodes for the current kernel... [ 2.243900] bpfilter: Loaded bpfilter_umh pid 420 #Continues normally from here without anything that seems odd The included attachment .txt has more information. From what I've read online from various bug trackers from other distributions this should be related to a missing kernel option (CONFIG_BPF_SYSCALL=y), but this option seems to be enabled: # Output after running in commandline: grep BPF /boot/config-`uname -r` # Kernel settings seem to be correct? CONFIG_CGROUP_BPF=y CONFIG_BPF=y CONFIG_BPF_SYSCALL=y CONFIG_BPF_JIT_ALWAYS_ON=y CONFIG_IPV6_SEG6_BPF=y CONFIG_NETFILTER_XT_MATCH_BPF=m CONFIG_BPFILTER=y CONFIG_BPFILTER_UMH=m CONFIG_NET_CLS_BPF=m CONFIG_NET_ACT_BPF=m CONFIG_BPF_JIT=y CONFIG_BPF_STREAM_PARSER=y CONFIG_LWTUNNEL_BPF=y CONFIG_HAVE_EBPF_JIT=y CONFIG_BPF_EVENTS=y CONFIG_BPF_KPROBE_OVERRIDE=y CONFIG_TEST_BPF=m Also my friend just installed 19.10 on his machine and is seeing the same warning, but I haven't found anyone else mentioning this issue at least on the latest Ubuntu 19.10. The same warning message is appearing if I run Ubuntu 19.10 in live mode from the USB stick. What I expected to happen: no such error (it doesn't appear on Fedora or openSUSE Tumbleweed that I've recently had installed on my other SSD) What happened instead: error appears during every boot sequence It's also worth stressing that the firewall is functioning just fine (using standard ufw) despite the error, so I'm guessing this is a harmless warning. ** Affects: systemd (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 eoan systemd ** Attachment added: "Parts of dmesg output related to error and verification that kernel options seem correct" https://bugs.launchpad.net/bugs/1851056/+attachment/5302300/+files/firewall_warning_systemd.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1851056 Title: "Proceeding WITHOUT firewalling in effect!" warning To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1851056/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
