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Tracefs may release more information about the kernel than desirable, so restrict it when the kernel is locked down in confidentiality mode by preventing open(). (Fixed by Ben Hutchings to avoid a null dereference in default_file_open()) Signed-off-by: Matthew Garrett <mjg59@google.com> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: James Morris <jmorris@namei.org>