JingMatrix/NeoZygisk

NeoZygisk

NeoZygisk is a Zygote injection module, implemented via ptrace, that provides Zygisk API support for APatch and KernelSU. It also functions as a powerful replacement for Magisk's built-in Zygisk.

Core Principles

NeoZygisk is engineered with four key objectives:

1. API Compatibility: Maintains full API compatibility with Magisk's built-in Zygisk. The relevant API designs are mirrored in the source folder injector for reference.
2. Minimalist Design: Focuses on a lean and efficient implementation of the Zygisk API, avoiding feature bloat to ensure stability and performance.
3. Trace Cleaning: Guarantees the complete removal of its injection traces from application processes once all Zygisk modules are unloaded.
4. Advanced Stealth: Employs a sophisticated DenyList to provide granular control over root and module visibility, effectively hiding the traces of your root solution.

The DenyList Explained

Modern systemless root solutions operate by creating overlay filesystems using mount rather than directly modifying system partitions. The DenyList is a core feature designed to hide these modifications by precisely controlling the mount namespaces for each application process.

Here is how NeoZygisk manages visibility for different application states:

To achieve a clean mount namespace for applications on the DenyList, NeoZygisk employs two distinct strategies: a primary, aggressive approach and a reliable fallback.

1. Direct Zygote Unmounting (Primary Strategy) As an experimental feature for bypassing advanced detection, NeoZygisk attempts to unmount all root-related traces directly from the zygote process itself. This cleans the environment before an application process is fully specialized, offering a potentially more robust hiding mechanism. To ensure system stability, this operation is only performed after a strict safety check. If a module is providing critical system resources (e.g., an overlay in /product), this direct unmount is aborted to prevent a zygote crash.

2. Namespace Switching (Fallback Strategy) If the direct unmount strategy is aborted for safety, or if any traces failed to unmount, NeoZygisk reverts to its standard, reliable method. After an app process forks, the setns syscall is used to switch it into a cached, completely clean mount namespace, effectively isolating it from all system modifications.

Configuration

To configure the DenyList for a specific application, use the appropriate setting within your root management app:

• For APatch/KernelSU: Enable the Umount modules option for your target application.
• For Magisk: Use the Configure DenyList menu.

Important Note for Magisk Users

The Enforce DenyList option in Magisk enables Magisk's own DenyList implementation. This is separate from NeoZygisk's functionality, is not guaranteed to hide all mount-related traces, and may conflict with NeoZygisk's hiding mechanisms. It is strongly recommended to leave this option disabled and rely solely on NeoZygisk's configuration.