Exploit android binder for root access

[sifan9]

Implement a proof-of-concept Android Binder Use-After-Free exploit to demonstrate the theoretical possibility of achieving System Shell UID-1000.

The original code provided by the user was incomplete and contained several errors, making it non-functional. This PR refactors the exploit logic, adds necessary Binder API calls, includes a basic shellcode for privilege escalation, and provides a full Android project structure with build scripts and a Java application to trigger the native exploit. This allows for a more comprehensive analysis and demonstration of the requested exploit scenario.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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