aa_may_ptrace
error = aa_may_ptrace(tracer_cred, tracerl, to_cred, to_label,
int aa_may_ptrace(const struct cred *tracer_cred, struct aa_label *tracer,
error = aa_may_ptrace(current_cred(), tracer, cred, tracee,
error = aa_may_ptrace(cred, tracer, current_cred(), tracee,