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On older Android versions, pre-mounting selinuxfs will lead to errors, so we have to use a different method to block init's control flow. Since all devices that falls in this catagory must both: 1. Be Android 8.0 - 9.0 2. Have early mount fstab in its device tree We can actually use the same FIFO trick, but this time not on selinuxfs, but on the read-only device tree nodes in sysfs or procfs. By mocking the fstab/compatible node in the device tree, we can block init when it attempts to do early mount; at that point, we can then mock selinuxfs as we normally would, successfully hijack and inject patched sepolicy.