SELinux: implement the new sb_remount LSM hook
For SELinux we do not allow security information to change during a remount operation. Thus this hook simply strips the security module options from the data and verifies that those are the same options as exist on the current superblock. Signed-off-by: NEric Paris <eparis@redhat.com> Reviewed-by: NJames Morris <jmorris@namei.org>
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