Android 4.1 Jelly Bean includes several new exploit mitigations and a more extensive implementation of ASLR to help defeat many kinds of exploits. ASLR is an exploit mitigation method that randomizes the positions of key data areas such as libraries, heap, stack, and the base of the executable, in a process’s address space. It makes it near impossible for malware authors and hackers to predict where their malicious payloads will be loaded. Jelly Bean also provides defenses to prevent information leakage exploits that can lead to much more serious OS exploits.
Source: https://thehackernews.com/2012/07/android-security-shielded-with-full.html