Re: [PATCH net-next 1/3] bpf: introduce current->pid, tgid, uid, gid, comm accessors

[Andy Lutomirski]

On Fri, Jun 12, 2015 at 2:40 PM, Alexei Starovoitov <ast@xxxxxxxxxxxx> wrote:
> eBPF programs attached to kprobes need to filter based on
> current->pid, uid and other fields, so introduce helper functions:
>
> u64 bpf_get_current_pid_tgid(void)
> Return: current->tgid << 32 | current->pid
>
> u64 bpf_get_current_uid_gid(void)
> Return: current_gid << 32 | current_uid

How does this work wrt namespaces, and why the weird packing?

--Andy
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