Cannot read system files even after obtaining platform signature
android, android-permissions
Solution
I've found the solution to this. Along with the platform signature and `android:sharedUserId="android.uid.system"` you also need to add `android:process="system"` in the `<application />` section of the manifest file.
Problem
I've build a custom android ROM. I've signed my application with platform signature and have added `android:sharedUserId="android.uid.system"` in the manifest file. My app is granted all "signature" and "system" level permission but access to system files are not granted. ``` Log.w("PC", String.valueOf(checkCallingOrSelfPermission("android.permission.ACCESS_SURFACE_FLINGER")== PackageManager.PERMISSION_GRANTED)); // true Log.w("PC", String.valueOf(checkCallingOrSelfPermission("android.permission.READ_FRAME_BUFFER")== PackageManager.PERMISSION_GRANTED)); // true Log.w("PC", String.valueOf(checkCallingOrSelfPermission("android.permission.INJECT_EVENTS")== PackageManager.PERMISSION_GRANTED)); // true Log.w("PC", String.valueOf(new File("/dev/graphics/fb0").canRead())); // false Log.w("PC", String.valueOf(new File("/data/misc/wifi/wpa_supplicant.conf").canRead())); // false ``` permissions of the files are: ``` ls -l /dev/graphics/fb0 crw-rw---- root graphics 29, 0 2014-02-12 09:43 fb0 ls -l /data/misc/wifi/wpa_supplicant.conf -rwxrwx--- wifi wifi 282 2014-02-11 19:04 wpa_supplicant.conf ``` Is there any way to get the access to these files?