Patched code sample

import os
import pwd
import sys
import importlib.util

def safe_get_user():
    # SECURE: Use built-in pwd module instead of external commands
    try:
        return pwd.getpwuid(os.getuid()).pw_name
    except (KeyError, OSError) as e:
        return f"Error: {str(e)}"

def secure_module_import():
    # SECURE: Validate import paths and use secure mechanisms
    try:
        # Validate Python installation path
        python_dir = os.path.dirname(sys.executable)
        if not os.path.isabs(python_dir):
            raise ValueError("Invalid Python directory path")
        
        # Use importlib for secure module checking
        spec = importlib.util.find_spec('readline')
        return spec is not None
    except (ImportError, ValueError) as e:
        return False

def validate_search_path():
    # SECURE: Validate and sanitize Python search paths
    safe_paths = []
    for path in sys.path:
        # Only include absolute paths within safe directories
        if os.path.isabs(path) and not path.startswith('/tmp'):
            safe_paths.append(path)
    return safe_paths

# Example of secure usage - no external command execution
user = safe_get_user()  # Uses pwd module instead of whoami command
has_readline = secure_module_import()  # Secure module validation
safe_paths = validate_search_path()  # Path validation