File I/O permissions

[sguerrini97]

Hi, I'm developing a kindlet and I would like to access the Kindle root file system. When I try to read a file I get a Java I/O persmission error in the "crash.log" file. I thought it was due to the fact that the cvm doesn't have root permissions so I try to access the user storage ("/mnt/us") but I got the same crash. Is it possible to access the file system from within a kindlet?
I read about a patch for root permissions when I started looking for informations about kindlet but I can't find it anymore.

[knc1]

It changed its name, it is included as part of the MKK package.
Check NiLuJe's snapshot thread for the most recent build.
Check our Wiki for extensive directions.
Check the "Where Do I Start" sticky thread to find the Wiki page and other content on the subject.

[sguerrini97]

Yep that's what I was talking about
So it turned out MKK is already installed on my Kindle. I tried importing ixtab's KindletJailbreak into my project, I can call the "isAvailable()" method in Jailbreak class with success, same for the "requestPermission()" method.

But I can't access file system.. This is the full crash log:

Edit: rewritten code:
Checks in Main.java:

if (jailbreak.isAvailable())
{
	if (((TestsJailbreak)jailbreak).requestPermissions())
	{
		pane.add( new JLabel("JB requestPermissions OK!") );
		File directory = new File("/tmp");
		File[] listOfFiles = directory.listFiles();

		for( int i=0; i<listOfFiles.length; i++ )
		{
			pane.add( new JLabel( listOfFiles[i].getName() ) );
		}
	}
	else
	{
		pane.add( new JLabel("JB requestPermissions FAILED!") );
	}
}
else
{
	pane.add( new JLabel("JB not available!") );
}

crash.log:

[04/06/16 12:39] Tests (v. 1)

java.security.AccessControlException: access denied (java.io.FilePermission /tmp read)
	at java.security.AccessControlContext.checkPermission(Compiled Method)(Unknown Source)
	at java.security.AccessController.checkPermission(Compiled Method)(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Compiled Method)(Unknown Source)
	at java.lang.SecurityManager.checkRead(Compiled Method)(Unknown Source)
	at java.io.File.list(Compiled Method)(Unknown Source)
	at java.io.File.listFiles(Compiled Method)(Unknown Source)
	at local.samu.tests.Main.initUi(Main.java:40)
	at local.samu.tests.Main.onCreate(Main.java:25)
	at ixtab.jailbreak.SuicidalKindlet.create(SuicidalKindlet.java:86)
	at ixtab.jailbreak.SuicidalKindlet.create(SuicidalKindlet.java:83)
	at com.amazon.kindle.kindlet.internal.lifecycle.m.call(cgf:1632)
	at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(Compiled Method)(FutureTask.java:178)
	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(Compiled Method)(ThreadPoolExecutor.java:1029)
	at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:547)
	at java.lang.Thread.run(Compiled Method)(Unknown Source)
	at java.lang.Thread.startup(Compiled Method)(Unknown Source)

[encol]

Have you read this?

[sguerrini97]

Thank you! That's very clear, I got it working ^^

[knc1]

Originally Posted by sguerrini97

Yep that's what I was talking about
- - - - -

Too bad it didn't occur to you to say so in your first post.

Context is important to any question.

[sguerrini97]

Originally Posted by knc1

Too bad it didn't occur to you to say so in your first post.

Context is important to any question.

I meant to say that the MKK package it's the patch I was talking about, but I didn't know it's name so i didn't know I had it installed. I meant "thank you for pointing me that", sorry for any misunderstanding

[NiLuJe]

Yeah, you need the "project-side" Kindlet Jailbreak lib added to your projects to be able to use it .

[knc1]

Not a problem here, encol was able to guess what the O.P. needed.
A good thing too, I had forgotten that link / write-up.