DynAMOS

DynAMOS is a cutting-edge on-the-fly kernel updating system that provides adaptive and mutative capabilities to commodity operating systems without the need for kernel recompilation or reboot. The project is based on a unique and efficient dynamic instrumentation technique known as adaptive function cloning. The software offers the ability to switch seamlessly between multiple editions of functions, which can run concurrently to each other.

One of the most significant features of DynAMOS is the ability to replace non-quiescent kernel subsystems quickly. This means that core kernel subsystems that never quiesce, such as the scheduler and kernel threads, can be updated substantially. Additionally, the software offers a technique for updating compact datatype definitions, enabling new fields to be added to datatypes using a shadow data structure that contains the fields.

DynAMOS implements a methodology of quiescence detection to ensure safe reversibility. This means that updated functions can be removed with the guarantee that they are not being used by the stack or program counter of any process. The software is highly adaptable, enabling execution to be switched adaptively between multiple, possibly concurrently running, function editions. This makes DynAMOS the first dynamically applied, adaptive kernel updating system.

Furthermore, DynAMOS offers a multi-phase updating algorithm for the replacement of complete kernel subsystems, notably for the cases where the timeliness of an update depends on synchronization of multiple kernel paths. This feature ensures synchronized updates to the system.

In the latest release, the users manual has been updated. Overall, DynAMOS is a powerful tool for updating kernel subsystems and provides a range of advanced features and capabilities to enhance the functionality of commodity operating systems.