Perhaps then python -c 'import os; os.mknod("/tmp/yow", 0060000, 2048); os.chmod("/tmp/yow", 0777)' But clearly your point is right that a Unix environment

Perhaps then python -c 'import os; os.mknod("/tmp/yow", 0060000, 2048); os.chmod("/tmp/yow", 0777)' But clearly your point is right that a Unix environment could still prevent someone with root access from accessing the raw disk device, including at the kernel level.