Just after Google released Android 5.0 lollipop, Nexus 5\Nexus 7 also ushered in the second preview version of Android 5.0, but the problem is that the previous Root solution has failed. Fortunately, Chainfire, the developer of SuperSU, has rapidly announced the new Root solution, but the process is cumbersome.
According to a long text he later published in Google+, Google originally introduced a number of security enhancements in the new version, especially forced to open SELinux. SElinux is the most outstanding security subsystem in the history of Linux in the United States National Security Bureau, and devices equipped with this subsystem will automatically turn on encryption by default. It seems that in the future Android system, simply root is not so easy.
New Root scheme needs to be brushed into the system kernel
Because of the security restrictions of the new version of the system, Root will not be able to get it as an update patch as before. The solution given by Chainfire is that you need to manually edit the modified version of the Android system kernel to implement Root.
This also means that you need to download the corresponding boot first. Img starts the image file. Then connect the PC computer, brush it through the FastBoot tool, and finally let the phone into Recovery mode, brush into the SuperSU ZIP file that was previously copied into the phone. For the players who are used to Brush, this should be nothing; but for the average user, this Root is simply too much trouble.
Chainfire is also mentioned in the text, like the Nexus series of models does not lock the bootloader, so brushing the kernel is still a good idea. But this approach to those who have locked the bootloader (especially the operator's contract machine), it is impossible to implement the root by brushing the kernel.
Root application with a new dance
Chainfire revealed that due to the new version of the security mechanism, a large number of Root applications currently require urgent release updates. If the application behavior is in line with the SDK, it will be okay, but if it crosses the border a bit, it will surely hit the wall because part of the file system of the new version has not been moved.
Of course, Chainfire also said that if it is really necessary, it can also bypass the security restrictions by modifying the SElinux strategy. But at least he feels he will try not to do this. After all, safety is not a trivial matter.
Convenience and security are always unattainable. On the new Android system, we also see the growing importance of security, and Root may become more and more difficult.
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