I absolutely love ZFS, but I think it's only a piece of the puzzle necessary for mitigating this threat. In terms of data integrity, I sure hope no system running ZFS would have it's snapshots also corrupted, but if that did happen, then hopefully those ZFS snapshots would have been backed up to some offline media like tape or optical disk. Example: http://girlyngeek.blogspot.com/2014/02/zfs-on-read-only-devi...