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I am trying to figure out how to compile the AOSP with superuser. I was pointed to this question: Build Android with Superuser. The instructions seem a little unclear and I also do not understand exactly what is going on. It also seems to talk about this allowing su privileges on android apps. I am not trying to get this on apps. I was trying to have root access when running some code in the main android source(specifically trying to open a socket in DisplayDevice.cpp).

I have asked a similar question here(Create a socket in android code(not in android application) getting Permission Denied). I figured that since I was put on the right track and now know that I need to compile the code as superuser, I should just ask another question.

I have added the su-binary code to my AOSP code as per instructions from the first SO question. I have also changed my init.rc, but am under the impression that I need to do something to make those changes go through as well. This is not talked about in the question. Right now when I run make su-binary I get "make: Nothing to be done for `su-binary'.". I think something was wrong here. I am using the makefile specified by m-ric. I also was not sure if I needed the Superuser.apk since I am not working with code that will be found in an Android app.

If anyone could point me in the right direction for this I would be really grateful. I am happy to provide more information if needed.

Community
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challeng
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2 Answers2

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Actually, I can explain how to build Android with Superuser but I think you do not this for your task. The problem is that the process that runs the code of DisplayDevice.cpp does not belong to inet group (usually gid = 3003).

I'm not familiar with display system of Android but if you want to just experiment I would recommend you the following steps.

  1. You need to find out the process id where your code run.
  2. Assign to this process gid of inet group.
Yury
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  • We ended up doing it another way. But this way still makes sense and helps to explain some issues we ran in to. Thank you! – challeng Mar 11 '13 at 19:38
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Right now when I run make su-binary I get "make: Nothing to be done for `su-binary'."

An example how to change su.c can be found here: https://code.google.com/p/aosp4nexus5/wiki/AOSPforNexus5#Debugging_a_C_file

Actually only logging is added, but it is the same as changing setgid() and setuid() calls. :-)

feri
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