read only bind mount ignores ready only

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Forwarding report from
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/712892

It seems that the kernel has a bug where it silently ignores the
MS_RDONLY flag when creating a bind mount.  mount issues a warning
that the mount point appears to be read-write even though you
requested read only.  The reporter suggests a patch to automatically
attempt to remount with MS_RDONLY before issuing this warning to work
around the kernel bug.  What do you think?

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