add device information to documentation

Author: timwr

documentation/modules/exploit/android/local/put_user_vroot.md

@@ -4,6 +4,8 @@ This modules exploits a vulnerability in the linux kernel on an Android device,
 
 The exploit uses a read kernel memory primitive to first figure out the correct offsets for the device, before using the write primitive to overwrite the ptmx.fsync handler to a function that will elevate the current process to root. Finally /dev/ptmx is opened, and fsync called to trigger the exploit.
 
+This exploit should work on any vulnerable device and is not device specific. In the example below a Samsung Galaxy S4 running Android version 4.3 was targetted.
+
 ## Usage
 
 You'll first need to obtain a session on the target device. Once the module is loaded, one simply needs to set the ```SESSION``` option and configure the handler. The exploit can take a while to run on the device so it is configured with ```WfsDelay``` option to wait 120 seconds for a session. If you have not had a session after this time you can assume the device is not vulnerable.