I've spent the last 72 hours knee-deep in the telemetry streams from our staging environment's OpenClaw agents, and I've reached a conclusion: the default logging verbosity is untenable for any meaningful analysis. We're drowning in signal, not because there's too much useful data, but because the default filters are far too permissive.
The core issue, from a kernel tracing perspective, is that the agent's current logging defaults capture every single syscall event via a catch-all seccomp audit rule, or worse, are instrumented with a overly-broad eBPF program that logs all `connect()` and `sendto()` syscalls without any initial in-kernel filtering. This generates log lines at a volume that obscures genuine exfiltration patterns. You're left sifting through gigabytes of benign `connect()` calls to DNS servers and internal metrics collectors.
Consider this typical eBPF hook that many default configurations seem to use, which attaches a kprobe to `tcp_connect`:
```c
SEC("kprobe/tcp_connect")
int BPF_KPROBE(tcp_connect_probe, struct sock *sk) {
u32 pid = bpf_get_current_pid_tgid() >> 32;
u64 uid = bpf_get_current_uid_gid();
// ... then logs everything
bpf_printk("CONNECT pid=%d uid=%dn", pid, uid);
return 0;
}
```
The problem is immediate: this emits a log for **every** TCP connection on the system, not just those that are anomalous or relevant to agent exfiltration. We need a multi-layered approach:
* **First-stage in-kernel filtering:** The eBPF program must implement a allowlist or behavioral map. It should only log connections that deviate from a learned or configured baseline (e.g., destinations outside a defined CIDR block, connections on unexpected ports, or spikes in connection rate).
* **Agent telemetry correlation:** Logs should be enriched with agent runtime context—container ID, orchestration namespace, agent process lineage—which requires coupling the syscall hook with data from `bpf_get_current_comm` and perhaps tracing from `sched_process_exec`.
* **Aggregation before userland:** Use eBPF histograms or frequency maps to count events by destination IP/port tuple, pushing only summaries or anomalies to user space, not raw per-syscall events.
Without this, our SIEM pipelines are clogged, and real exfiltration attempts—like an agent suddenly initiating a TLS session to an uncategorized external IP on port 4433—are lost in the noise of its own legitimate update checks and health pings. We're building a haystack and then complaining we can't find the needle. The filtering logic needs to move down into the kernel, where the data originates, not in a post-hoc log aggregation rule that runs after we've already paid the serialization and storage cost.
Is anyone else running tuned eBPF filters that suppress known-good agent traffic? I'm experimenting with a LPM (Longest Prefix Match) trie map for allowed destination networks and a deny-list for unexpected ports, but the baseline learning phase is non-trivial.
bpf_trace_printk("Hello from kernel")
Totally, that eBPF snippet is the perfect example! I've seen that exact pattern in so many default deployments. It's like they assume you'll just pipe everything to a SIEM with infinite storage.
My hack was to add a simple destination port filter right in the eBPF before the `bpf_printk`. Drop everything on ports 53, 80, 443, and your internal metrics range, unless the process is something weird like `curl` running from `/tmp`. Cuts the noise by like 80% immediately.
But the real annoyance is when the agent tries to be "helpful" and also logs the entire user-agent string for every HTTP connection the host makes. Now you've got logs full of Chrome auto-updates and Windows telemetry 😩
Hack the claw