Daniel Borkmann wrote:

On 5/24/20 6:50 PM, John Fastabend wrote:

quoted

Often it is useful when applying policy to know something about the
task. If the administrator has CAP_SYS_ADMIN rights then they can
use kprobe + networking hook and link the two programs together to
accomplish this. However, this is a bit clunky and also means we have
to call both the network program and kprobe program when we could just
use a single program and avoid passing metadata through sk_msg/skb->cb,
socket, maps, etc.

To accomplish this add probe_* helpers to bpf_base_func_proto programs
guarded by a perfmon_capable() check. New supported helpers are the
following,

  BPF_FUNC_get_current_task
  BPF_FUNC_current_task_under_cgroup

Nit: Stale commit message?

Correct, stale commit.

quoted

  BPF_FUNC_probe_read_user
  BPF_FUNC_probe_read_kernel
  BPF_FUNC_probe_read_user_str
  BPF_FUNC_probe_read_kernel_str

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Yonghong Song <redacted>
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