The -o context= option is useful when mounting file systems that do not support extended attributes, such as a floppy or hard disk formatted with VFAT, or systems that are not normally running under SELinux, such as an ext3 formatted disk from a non-SELinux workstation. You can also use -o context= on file systems you do not trust, such as a floppy.
É do manual do SELinux link . Isso seria útil para você?