topic Re: Run shell command from priv-app application in i.MX Processors

Run shell command from priv-app application

tommos23 — Fri, 29 Sep 2017 15:03:51 GMT

I am trying to run shell commands from a system/priv-app I have added to the AOSP (7.1.1)

The command I am trying to run is: ip link add dev can0 type can to switch on the can bus.

I have build the image as both -eng & -userdebug releases.

The command runs fine in the adb shell and successfully switches on the CAN bus as expected.

My problem is that I get the following error: Cannot run program "su": error=13, Permission denied

When I try the following code within the system privileged java app:

//ArrayList<String> commands is passed into the method
try {
if (null != commands && commands.size() > 0) {
Process suProcess = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
  for (String currCommand : commands) {
   os.writeBytes(currCommand + "\n");
   os.flush();
  }
os.writeBytes("exit\n");
os.flush();
  BufferedReader stderr = new BufferedReader(new InputStreamReader(suProcess.getErrorStream()));
String line = "";
  String errString = "";
while ((line = stderr.readLine()) != null) errString += line + "\n";
suProcess.waitFor();
if (suProcess.exitValue() != 0)
  throw new Exception(errString);
} //Handle exception

Re: Run shell command from priv-app application

b36401 — Thu, 05 Oct 2017 05:42:16 GMT

The user has no rights to perform "su" action.
You need to add android.permission.ACCESS_SUPERUSER permissions for the user.

Have a great day,
Victor

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Re: Run shell command from priv-app application

tommos23 — Thu, 05 Oct 2017 09:11:33 GMT

Thanks for the reply Victor,

I believe android.permission.ACCESS_SUPERUSER has been deprecated since Android 5 and I receive the following error in the logcat report.

W PackageManager: Unknown permission android.permission.ACCESS_SUPERUSER in package com.carnation.flexcan

Is there another way to give an application su privileges?