Not sure whom to offer the fix, since 'Kernel lockdown for secure boot'
in not upstream, but it has been picked by fedora and ubuntu. And I see
it in next-lockdown branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git

So, in addition to (prior to) opening bug reports to distributions I'm
sending this patch hoping to reach its origin from where distributions
had picked it.

Vasily Gorbik (1):
  debugfs: avoid EPERM when no open file operation defined

 fs/debugfs/file.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

-- 
2.18.0.13.gd42ae10