Verified callback chain for bios security in an information handling system

A method comprising:

• monitoring, by a processor of an information handling system, for a unified extensible firmware interface (UEFI) event;
• in response to a detection of the UEFI event, reading a preauthorized event callback order;
• comparing a callback order for the UEFI event with the preauthorized event callback order;
• based on the callback order for the UEFI event not matching the preauthorized event callback order, detecting a potential vulnerability in the UEFI event;
• and
• in response to the detected potential vulnerability in the UEFI event, dispatching, by the processor, callback functions for execution in a same order as the preauthorized event callback order.

An information handling system comprising:

• a memory to store a basic input/output system (BIOS);
• and
• a processor to:
• monitor the BIOS for a unified extensible firmware interface (UEFI) event;
• in response to a detection of the UEFI event, read a preauthorized event callback order;
• perform a verification process for a signature of the preauthorized event callback order;
• in response to a failure of the verification process, store a safe BIOS in the memory;
• in response to a success of the verification process, compare a callback order for the UEFI event with the preauthorized event callback order;
• compare the callback order for the UEFI event with the preauthorized event callback order;
• if the callback order for the UEFI event matches the preauthorized event callback order, then dispatch one or more callback functions from the callback order for the UEFI event;
• if the callback order for the UEFI event does not match the preauthorized event callback order, then detect a potential vulnerability in the UEFI event;
• and
• in response to the detected potential vulnerability in the UEFI event, dispatch one or more callback functions for execution in a same order as the preauthorized event callback order.