Re: [PATCH net-next] bpf: make tracing helpers gpl only

From: Alexei Starovoitov
Date: Sun Oct 25 2015 - 14:18:46 EST

On 10/25/15 2:14 AM, Ingo Molnar wrote:
so I don't know the netfilter ones, but in particular the tracing ones I'm sure
should be gpl-only. Do we really, really want proprietary modules mucking with
such internals??

of course, not. Therefore bpf_probe_read() was gpl_only from very
beginning. Same goes to bpf_trace_printk() and bpf_ktime_get_ns().
and after this patch the only remaining non-gpl tracing helpers will be
and imo it's fine.

On the networking side the helpers are non-gpl, since all of them are
generic. They don't mess with kernel, but examine/modify the packet.
Just like cBPF can read the packet data, get_processor_id, get_random,
eBPF can do the same plus write into the packet, compute checksum,
redirect, push/pop vlan.

When we introduce eBPF for seccomp, I would argue that helpers on that
side should be non-gpl as well, otherwise people will try to add
features to cBPF instead of moving to eBPF.

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