Patched code sample

import pickle
import io

# This code represents the logic used in a fixed version of picklescan (>= 1.0.4)
# to correctly identify the dangerous 'profile.run' function.
# The vulnerability (CVE-2023-53873) was an incomplete blocklist.
# The fix was to add 'profile.run' to that blocklist.

# A simplified representation of the blocklist *after* the fix.
FIXED_DANGEROUS_GLOBALS = {
    "os.system",
    "subprocess.run",
    "eval",
    "exec",
    # ... many other dangerous built-ins and module functions
    "profile.run",  # This is the key addition that fixes the vulnerability.
}

def mock_picklescan_scanner(pickle_data):
    """
    A simplified scanner that checks if a global function call found in a pickle
    is present in the blocklist. This simulates the core logic of picklescan.
    """
    issues_found = 0
    # In a real scanner, this would involve parsing the pickle opcodes.
    # We simulate finding a dangerous global call for demonstration.
    # Let's pretend the unpickler found the following globals.
    found_globals = ["profile.run", "math.sqrt"] 

    print("--- Simulating scan with a fixed blocklist ---")
    for found_global in found_globals:
        if found_global in FIXED_DANGEROUS_GLOBALS:
            print(f"DANGEROUS: Found blocked global '{found_global}'.")
            issues_found += 1
        else:
            print(f"SAFE: Global '{found_global}' is not in the blocklist.")
    
    print("---------------------------------------------")
    if issues_found > 0:
        print(f"Scan complete. Security issues found: {issues_found}")
    else:
        print("Scan complete. Zero security issues found.")

if __name__ == "__main__":
    # A vulnerable scanner would incorrectly report "Zero security issues" for a
    # pickle containing `profile.run`.
    # This fixed scanner correctly identifies it as dangerous.
    
    # We don't need to create a real malicious pickle; we can just simulate
    # the scanner's logic on the name of the dangerous function.
    mock_picklescan_scanner(b"dummy pickle data")