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packaging(systemd): add cgroup to RestrictNamespaces (closes #163) #184

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Merged
WaylandYang merged 1 commit into from
May 28, 2026
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packaging(systemd): add cgroup to RestrictNamespaces (closes #163) #184

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14 changes: 13 additions & 1 deletion packaging/systemd/forkd-controller.service
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,19 @@ ProtectKernelModules=true
LockPersonality=true
MemoryDenyWriteExecute=false
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX AF_NETLINK
RestrictNamespaces=net mnt user pid
# Allowed namespaces (RestrictNamespaces is an allowlist; everything else
# returns EPERM on unshare/clone). Document the reason for each so a
# well-intentioned trim doesn't silently break a feature:
# net — per-child network namespace (one tap + one bridge endpoint
# per fork)
# mnt — per-VM mount namespace (rootfs, virtio-fs, scratch)
# user — unprivileged subprocess isolation
# pid — Firecracker per-VM PID namespace (so PID 1 in the guest
# doesn't collide with host PIDs in logs and signals)
# cgroup — required for per-child cgroup-v2 namespace under the
# delegated subtree (without this, `unshare(CLONE_NEWCGROUP)`
# returns EPERM — see #163)
RestrictNamespaces=net mnt user pid cgroup
RestrictRealtime=true
SystemCallArchitectures=native
SystemCallFilter=@system-service
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