Secure firmware updates using virtual machines to validate firmware packages
Provided herein are systems, methods, and computer program products for testing a firmware update in a secure virtual environment prior to actually installing the firmware update in a device or system. In one embodiment, a firmware update is received. The system is rebooted after receiving the firmware update, and a virtual machine monitor (VMM) is launched following the reboot. In turn, the VMM registers various exit handlers and policies, and launches a virtual machine within a unified extensible firmware interface (UEFI) stored within a reprogrammable read only memory. The process uses the VMM to launch a virtual machine, which is used to perform a test installation of the firmware update. If no violations or other errors are detected in connection with the test installation, the process reboots the system again and installs the firmware update in the regular operating environment following the reboot.
1. A method comprising:
receiving a firmware update by a computer;
booting into a basic input output system (BIOS) of the computer that includes a unified extensible firmware interface (UEFI);
initiating a virtual machine in the UEFI;
allocating reserved memory for the virtual machine, wherein the reserved memory cannot access memory used by an operating system of the computer;
installing the firmware update in the virtual machine in the UEFI, wherein the virtual machine is decoupled from the operating system of the computer;
determining that the firmware update installed error-free in the virtual machine in the UEFI; and
based on determining that the firmware update installed error-free:
performing a reboot of the computer including initiating execution of the operating system of the computer; and
installing, by the operating system, the firmware update in the computer.
2. The method of claim 1 , further comprising:
prior to initiating the virtual machine, registering one or more event handler policies.
3. The method of claim 1 , determining that the firmware update installed error-free in the virtual machine comprises:
determining that installing the firmware update in the virtual machine caused no access violations in the reserved memory.
4. The method of claim 1 , further comprising:
receiving, by the computer, a second firmware update;
registering one or more event handlers;
initiating the virtual machine in the UEFI;
installing the second firmware update in the virtual machine in the UEFI;
determining that an access violation occurred in the reserved memory as a result of installing the second firmware update in the virtual machine environment; and
invoking an event handler of the one or more event handlers, wherein the event handler is associated with the access violation.
5. The method of claim 4 , further comprising:
receiving an error from the event handler;
determining, based on the error, that the error cannot be resolved by the event handler;
displaying an error message associated with the error; and
not installing the second firmware update in the computer.
6. The method of claim 1 , wherein the firmware update comprises an updated BIOS to replace the BIOS.
7. The method of claim 1 , wherein determining that the firmware update installed error-free in the virtual machine comprises:
determining that the firmware update installed in the virtual machine did not attempt to access one or more prohibited memory locations of the reserved memory.
8. A computer comprising:
a basic input output system (BIOS) comprising a unified extensible firmware interface (UEFI);
a microprocessor; and
a non-transient computer-readable storage medium, comprising computer instructions executable by the microprocessor, wherein the computer instructions are configured to perform operations comprising:
receiving a firmware update;
booting into the BIOS;
initiating a virtual machine in the UEFI, wherein the virtual machine is decoupled from an operating system of the computer;
allocating reserved memory for the virtual machine, wherein the reserved memory cannot access memory used by an operating system of the computer;
installing the firmware update in the virtual machine in the UEFI;
determining that the firmware update installed error-free in the virtual machine in the UEFI; and
based on determining that the firmware update installed error-free:
performing a reboot of the computer including initiating execution of the operating system of the computer; and
installing, by the operating system, the firmware update in the computer.
9. The computer of claim 8 , the operations further comprising:
prior to initiating the virtual machine, registering one or more event handler policies.
10. The computer of claim 8 , the operations further comprising:
installing a second firmware update in the virtual machine in the UEFI;
determining that the second firmware update attempted to access one or more prohibited memory locations in the reserved memory; and
not installing the second firmware update in the computer.
11. The computer of claim 8 , the operations further comprising:
receiving a second firmware update;
registering one or more event handlers;
initiating the virtual machine in the UEFI;
installing the second firmware update in the virtual machine in the UEFI;
determining that an access violation occurred in the virtual machine after installing the second firmware update; and
invoking an event handler of the one or more event handlers, wherein the event handler is associated with the access violation.
12. The computer of claim 11 , the operations further comprising:
receiving an error from the event handler;
determining, based on the error, that the access violation in the virtual machine cannot be resolved by the event handler;
displaying an error message associated with the error; and
not installing the second firmware update in the computer.
13. The computer of claim 8 , wherein the firmware update comprises an update to at least one of:
the BIOS;
a disk drive firmware of the computer;
a modem firmware of the computer;
a wireless communications card firmware of the computer;
a network interface controller (NIC) firmware of the computer; or
a computer graphics card firmware of the computer.
14. The computer of claim 8 , wherein determining that the firmware update installed error-free in the virtual machine comprises:
determining that the firmware update installed in the virtual machine in the UEFI did not attempt to access one or more prohibited memory of the reserved memory.
15. A computer program product, comprising a plurality of instructions stored on a non-transient computer-readable storage medium, wherein the instructions are executable by one or more processors of a computer to perform operations comprising:
receiving a firmware update;
booting into a basic input output system (BIOS) of the computer that includes a unified extensible firmware interface (UEFI);
initiating a virtual machine in the UEFI;
allocating reserved memory for the virtual machine, wherein the reserved memory cannot access memory used by an operating system of the computer;
installing the firmware update in the virtual machine in the UEFI;
determining that the firmware update installed error-free in the virtual machine in the UEFI, wherein the virtual machine is decoupled from an operating system of the computer; and
based on determining that the firmware update installed error-free:
performing a reboot of the computer including initiating execution of the operating system of the computer; and
installing, by the operating system, the firmware update in the computer.
16. The computer program product of claim 15 , the operations further comprising:
prior to initiating the virtual machine, registering one or more event handler policies.
17. The computer program product of claim 15 , wherein
installing a second firmware update in the virtual machine in the UEFI;
determining that the second firmware update installed in the virtual machine in the UEFI attempted to access one or more prohibited memory locations in the reserved memory; and
exiting a firmware installation process without installing the second firmware update in the computer.
18. The computer program product of claim 15 , the operations further comprising:
receiving a second firmware update;
registering one or more event handlers;
initiating the virtual machine in the UEFI;
installing the second firmware update in the virtual machine in the UEFI;
determining that an access violation occurred in the virtual machine as a result of installing the second firmware update in the virtual machine; and
invoking an event handler of the one or more event handlers wherein the event handler is associated with the access violation.
19. The computer program product of claim 18 , the operations further comprising:
receiving an error from the event handler;
determining, based on the error, that the error cannot be resolved by the event handler;
displaying an error message associated with the error; and
not installing the second firmware update in the computer.
20. The computer program product of claim 15 , wherein the firmware update comprises an update to at least one of:
the BIOS;
a disk drive firmware of the computer;
a modem firmware of the computer;
a wireless communications card firmware of the computer;
a network interface controller (NIC) firmware of the computer; or
a computer graphics card firmware of the computer.