- 1 year ago
Executing assembly code in memory using python modules ctypes and mmap
To execute assembly code in memory using Python modules ctypes
and mmap
, you can follow these steps:
Write your assembly code: Start by writing the assembly code that you want to execute. You can write it as a string or store it in a separate file.
Create a writable executable memory region: Use the
mmap
module to create a writable and executable memory region in your Python script. This will allow you to write and execute the assembly code in memory. Here's an example:
pythonimport mmap
# Create a writable and executable memory region
memory = mmap.mmap(-1, len(assembly_code), prot=mmap.PROT_WRITE | mmap.PROT_EXEC)
Replace assembly_code
with the actual assembly code you want to execute.
- Write the assembly code to memory: Write the assembly code to the memory region you created using the
write
method of the memory object. Here's an example:
pythonmemory.write(assembly_code.encode())
- Define a function pointer: Use the
ctypes
module to define a function pointer that points to the memory region where the assembly code is stored. Here's an example:
pythonimport ctypes
# Define a function pointer with the correct signature
func_ptr = ctypes.CFUNCTYPE(ctypes.c_void_p)(ctypes.addressof(ctypes.c_char.from_buffer(memory)))
- Call the function pointer: You can now call the function pointer as a regular Python function to execute the assembly code. Here's an example:
pythonfunc_ptr()
- Clean up the memory: After executing the assembly code, make sure to clean up the memory region using the
close
method of the memory object. Here's an example:
pythonmemory.close()
That's it! You have now executed assembly code in memory using ctypes
and mmap
. Please note that executing assembly code in memory can be dangerous if not handled properly. Ensure that you understand the code you are executing and take necessary precautions to prevent any unintended consequences or security risks.