selinux: selinux_setprocattr()->ptrace_parent() needs rcu_read_lock()
selinux_setprocattr() does ptrace_parent(p) under task_lock(p), but task_struct->alloc_lock doesn't pin ->parent or ->ptrace, this looks confusing and triggers the "suspicious RCU usage" warning because ptrace_parent() does rcu_dereference_check(). And in theory this is wrong, spin_lock()->preempt_disable() doesn't necessarily imply rcu_read_lock() we need to access the ->parent. Reported-by: NEvan McNabb <emcnabb@redhat.com> Signed-off-by: NOleg Nesterov <oleg@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: NPaul Moore <pmoore@redhat.com>
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