Granted Patent B2

US 9,471,780 · App. 14/816,199 · Granted Oct 18, 2016

Abstract

Claims (42)

1. A non-transitory computer readable medium comprising instructions stored thereon that when executed cause a programmable device to:

mount an image of an operating system in a pre-boot environment of the programmable device;

identify an untrusted component of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early; and

substitute a trusted component for the untrusted component, wherein the trusted component is a first component and the untrusted component is a second component.

2. The computer readable medium of claim 1 , wherein the instructions stored thereon that when executed cause the programmable device to substitute a trusted component for the untrusted component comprise instructions that when executed cause the programmable device to:

determine that the untrusted component is a critical component, and

identify that the trusted component is capable of substituting for the critical component.

3. The computer readable medium of claim 1 , wherein the untrusted component is an advanced component and wherein the trusted component is a standard component.

4. The computer readable medium of claim 1 , wherein the instructions stored thereon that when executed cause the programmable device to identify an untrusted component of the operating system comprise instructions that when executed cause the programmable device to:

verify a digital signature associated with components of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early.

5. The computer readable medium of claim 1 , wherein the instructions stored thereon further comprise instructions that when executed cause the programmable device to:

monitor a security system of the programmable device during execution of the operating system, to ensure that the security system executes as expected.

6. The computer readable medium of claim 1 , wherein the pre-boot environment is provided by a chipset extension.

7. A programmable apparatus, comprising:

one or more processors; and

a memory, coupled to the one or more processors, on which are stored instructions, comprising instructions that when executed cause at least some of the one or more processors to:

mount an image of an operating system in a pre-boot environment of the programmable apparatus;

identify an untrusted component of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early; and

substitute a trusted component for the untrusted component, wherein the trusted component is a first component and the untrusted component is a second component.

8. The programmable apparatus of claim 7 , wherein the instructions that when executed cause at least some of the one or more processors to substitute a trusted component for the untrusted component comprise instructions that when executed cause at least some of the one or more processors to:

determine that the untrusted component is a critical component, and

identify that the trusted component is capable of substituting for the critical component.

9. The programmable apparatus of claim 7 , wherein the untrusted component is an advanced component and wherein the trusted component is a standard component.

10. The programmable apparatus of claim 7 , wherein the programmable apparatus is a mobile device.

11. The programmable apparatus of claim 7 , wherein the programmable apparatus is an embedded programmable device.

12. The programmable apparatus of claim 7 , wherein the one or more processors and memory are virtualized.

13. The programmable apparatus of claim 7 , wherein the instructions that when executed cause at least some of the one or more processors to identify an untrusted component of the operating system comprise instructions that when executed cause at least some of the one or more processors to:

verify a digital signature associated with components of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early.

14. A method of controlling loading of an operating system, comprising:

mounting an image of an operating system in a pre-boot environment of a programmable device;

identifying an untrusted component of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early; and

substituting a trusted component for the untrusted component, wherein the trusted component is a first component and the untrusted component is a second component.

15. The method of claim 14 , wherein substituting a trusted component for the untrusted component comprises:

determining that the untrusted component is a critical component, and

identifying that the trusted component is capable of substituting for the critical component.

16. The method of claim 14 , wherein the untrusted component is an advanced component and wherein the trusted component is a standard component.

17. The method of claim 14 , wherein identifying an untrusted component of the operating system further comprises:

verifying a digital signature associated with components of the operating system registered to be automatically loaded or loaded during a boot-up stage of the operating system that is predetermined to be early.

18. The method of claim 14 , further comprising:

monitoring a security system of the programmable device during execution of the operating system, to ensure that the security system executes as expected.

19. The method of claim 14 , wherein the pre-boot environment is a virtualized pre-boot environment.

20. The method of claim 14 , wherein the pre-boot environment is provided by a chipset extension.

Assignments (9)