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51775fe736
Unless task == current ptrace_parent(task) is not safe even under rcu_read_lock() and most of the current users are not right. So may_change_ptraced_domain(task) looks wrong as well. However it is always called with task == current so the code is actually fine. Remove this argument to make this fact clear. Note: perhaps we should simply kill ptrace_parent(), it buys almost nothing. And it is obviously racy, perhaps this should be fixed. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: John Johansen <john.johansen@canonical.com>