According to a recent post by Koushik Dutta, aka – Koush, on Google+, there are some issues with the Superuser functionality in Android 4.3. According to Koush:
“Basically /system is mounted as nosuid to any zygote spawned process (ie, all Android apps). Root will still continue to work via adb shell, etc.
This is a pretty nasty change. It seems that SuperSU works around this by replacing install-recovery.sh to run a su daemon that pipes subsequent through it. Pretty hacky, but understandable why it was done this way.
Will need to look into how to do this in a less invasive fashion, if that is even possible. Of course, if building from source, this change can simply be reverted.”
What do you think of this change? Let us know in the comments.