OvO

A kernel driver module designed to provide portable hacking operations!

Rootkit operation of some kernel modules is provided for the kernel of android-aarch64, this is a learning project of mine, and some mistakes may be corrected in the future.

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Inter-communication (supports multiple users)

By implementing a custom network protocol family, user space communication can be achieved both synchronously and asynchronously without relying on character devices or netlinks:

• No filesystem operations required
• Low overhead implementation without using kprobes for system call interception
• Uses stable kernel interfaces for improved maintainability

Features

Module Base Address Acquisition (memory.h->get_module_base)

Provides an alternative method to get module base addresses without reading /proc/self/maps, which may be monitored by anti-cheat software.

Process Memory Operations

Virtual to Physical Address Translation (memory.h->vaddr_to_phy_addr)

Converts virtual addresses (VA) to physical addresses (PA) by:

• Traversing page table hierarchy (PGD -> P4D -> PUD -> PMD -> PTE)
• Handling page table folding and huge pages
• Computing final physical address using page frame number and offset

Memory Read/Write Operations

Two implementations available:

• memory.h->rw_process_memory: Custom implementation using page table traversal and physical address mapping
• memory.h->access_process_vm_by_pid: Utilizes kernel's built-in access_process_vm function for direct process memory access

Root Privilege Escalation (kkit.h->mark_pid_root) (Deprecated)

A stealthy approach to elevate process privileges by:

• Locating target process's task_struct
• Creating new credentials with root uid/gid (0)
• Directly modifying process credential pointer instead of using commit_creds()
• Avoiding root uid visibility in ps command output

Fast Cross-Process Memory Remapping (process_vaddr_to_pfn, remap_process_memory)

An efficient approach for cross-process memory access by:

• Converting source process virtual address to physical page frame number (PFN)
• Directly remapping memory through page table manipulation
• Bypassing traditional system calls and memory copy operations
• Achieving 3ms per 100M operations vs 80ms/100k ops with traditional methods

Performance highlights:

• Direct page table access without syscalls
• 100M memory operations: ~3ms
• Traditional approach (ioremap): 80ms for 100k operations
• ~26,000x performance improvement over conventional methods

Touch Event Simulation

Implements comprehensive touch event simulation through IOCTL interface with following capabilities:

• Touch event handling (ovo_ioctl):
  • Down events (CMD_TOUCH_CLICK_DOWN): Simulates finger press with pressure and position data
  • Up events (CMD_TOUCH_CLICK_UP): Handles touch release
  • Move events (CMD_TOUCH_MOVE): Processes continuous touch movement
• Event features:
  • Multi-touch support through slot management
  • Precise position control (X, Y coordinates)
  • Pressure simulation
  • Event pooling with overflow protection
• Implementation details:
  • Uses spinlock for thread-safe event handling
  • Implements proper error handling and user-space data validation
  • Efficient event caching through input_event_cache
  • Supports MT protocol for touch reporting

CI Support

• android-kernel-build-action