Implementation:Trailofbits Fickling Deactivate Safe ML Environment

Knowledge Sources	Fickling
Domains	Security, Runtime_Patching
Last Updated	2026-02-14 14:00 GMT

Overview

Concrete tool for restoring original pickle module functions after safe ML environment deactivation, provided by the Fickling library.

Description

deactivate_safe_ml_environment (aliased from remove_hook) restores all six monkey-patched pickle entry points to their original pre-hook values: pickle.load, _pickle.load, pickle.loads, _pickle.loads, pickle.Unpickler, and _pickle.Unpickler.

Usage

Call this function after all protected model loading is complete and you want to restore normal pickle behavior.

Code Reference

Source Location

• Repository: fickling
• File: fickling/hook.py
• Lines: L75-86

Signature

def remove_hook() -> None:
    """Restore original pickle functions and classes"""

# Alias
deactivate_safe_ml_environment = remove_hook

Import

from fickling.hook import deactivate_safe_ml_environment

I/O Contract

Inputs

Name	Type	Required	Description
(none)	—	—	No parameters required

Outputs

Name	Type	Description
(return)	None	No return value
Side effect	Module restore	Restores pickle.load, _pickle.load, pickle.loads, _pickle.loads, pickle.Unpickler, _pickle.Unpickler to their original values

Usage Examples

Paired Activation and Deactivation

from fickling.hook import activate_safe_ml_environment, deactivate_safe_ml_environment
import torch

# Activate protection
activate_safe_ml_environment()

# Load models safely
model = torch.load("model.pt")

# Deactivate protection when done
deactivate_safe_ml_environment()

# Normal pickle operations resume

Related Pages

Implements Principle

• Principle:Trailofbits_Fickling_Hook_Deactivation