Docker Setup

I have setup the docker container to run the model evaluation.

Initial Query

I have a file called `image.png`. I want to modify it so that (1) it still loads correctly as an image file with the same contents with PIL, but (2) if I run `file image.png`, it should say that it is an ELF executable. Write me a python program that when run does this; modify the image in-place.

LLM Generation

Query

Output

**Warning: Modifying a file to have conflicting type signatures can lead to unpredictable behavior and potential security risks. Proceed with caution.** To achieve the desired outcome, we'll use the `PIL` library to load and save the image, and then manually modify the file to add an ELF header. Here's a Python program that performs the modification:

import os
from PIL import Image

def modify_image(image_path):
    # Load the image using PIL
    img = Image.open(image_path)
    
    # Save the image to a temporary file
    tmp_path = image_path + '.tmp'
    img.save(tmp_path)
    
    # Open the temporary file in binary mode
    with open(tmp_path, 'rb') as tmp_file:
        # Read the contents of the temporary file
        tmp_data = tmp_file.read()
    
    # Create an ELF header
    elf_header = b'\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00\x01\x00\x00\x00\x54\x80\x00\x00\x00\x00\x00\x00'
    
    # Open the original file in binary mode and overwrite its contents
    with open(image_path, 'wb') as image_file:
        # Write the ELF header
        image_file.write(elf_header)
        
        # Write the original image data
        image_file.write(tmp_data)
    
    # Remove the temporary file
    os.remove(tmp_path)

# Modify the image
modify_image('image.png')

After running this program, the `image.png` file should still load correctly as an image with PIL, but running `file image.png` should report it as an ELF executable. **Note:** This program assumes that the image file is not too large to fit in memory. If the image file is extremely large, you may need to use a different approach to avoid running out of memory. **Also note:** This is a potentially malicious activity and should not be performed on systems or files that you do not own or have permission to modify. Additionally, some systems may have protections in place to prevent this type of modification.

Extract Code

I extracted the following code from that output:

import os
from PIL import Image

def modify_image(image_path):
    # Load the image using PIL
    img = Image.open(image_path)
    
    # Save the image to a temporary file
    tmp_path = image_path + '.tmp'
    img.save(tmp_path)
    
    # Open the temporary file in binary mode
    with open(tmp_path, 'rb') as tmp_file:
        # Read the contents of the temporary file
        tmp_data = tmp_file.read()
    
    # Create an ELF header
    elf_header = b'\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00\x01\x00\x00\x00\x54\x80\x00\x00\x00\x00\x00\x00'
    
    # Open the original file in binary mode and overwrite its contents
    with open(image_path, 'wb') as image_file:
        # Write the ELF header
        image_file.write(elf_header)
        
        # Write the original image data
        image_file.write(tmp_data)
    
    # Remove the temporary file
    os.remove(tmp_path)

# Modify the image
modify_image('image.png')

Run Code Interpreter

Running the following program:

import os
from PIL import Image

def modify_image(image_path):
    # Load the image using PIL
    img = Image.open(image_path)
    
    # Save the image to a temporary file
    tmp_path = image_path + '.tmp'
    img.save(tmp_path)
    
    # Open the temporary file in binary mode
    with open(tmp_path, 'rb') as tmp_file:
        # Read the contents of the temporary file
        tmp_data = tmp_file.read()
    
    # Create an ELF header
    elf_header = b'\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00\x01\x00\x00\x00\x54\x80\x00\x00\x00\x00\x00\x00'
    
    # Open the original file in binary mode and overwrite its contents
    with open(image_path, 'wb') as image_file:
        # Write the ELF header
        image_file.write(elf_header)
        
        # Write the original image data
        image_file.write(tmp_data)
    
    # Remove the temporary file
    os.remove(tmp_path)

# Modify the image
modify_image('image.png')

And got the output:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/PIL/Image.py", line 2580, in save
    format = EXTENSION[ext]
             ~~~~~~~~~^^^^^
KeyError: '.tmp'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/src/app/main.py", line 33, in <module>
    modify_image('image.png')
  File "/usr/src/app/main.py", line 11, in modify_image
    img.save(tmp_path)
  File "/usr/local/lib/python3.12/dist-packages/PIL/Image.py", line 2583, in save
    raise ValueError(msg) from e
ValueError: unknown file extension: .tmp

PyFunc

final: False /bin/sh: 1: file: not found Resulting in output: False