Joe M Epstein

US Patent:

D2520834, Jun 12, 1979

Filed:

Feb 16, 1977

Appl. No.:

5/768966

Inventors:

Joe M. Epstein - Houston TX

International Classification:

D1303

US Classification:

D13 41

US Patent:

20150261690, Sep 17, 2015

Filed:

May 27, 2015

Appl. No.:

14/723216

Inventors:

- San Jose CA, US
Joe Epstein - Palo Alto CA, US

International Classification:

G06F 12/14
G06F 9/455

Abstract:

In an embodiment, a data processing method comprises implementing a memory event interface to a hypercall interface of a hypervisor or virtual machine operating system to intercept page faults associated with writing pages of memory that contain a computer program; receiving a page fault resulting from a guest domain attempting to write a memory page that is marked as not executable in a memory page permissions system; determining a first set of memory page permissions for the memory page that are maintained by the hypervisor or virtual machine operating system; determining a second set of memory page permissions for the memory page that are maintained independent of the hypervisor or virtual machine operating system; determining a particular memory page permission for the memory page based on the first set and the second set; processing the page fault based on the particular memory page permission, including performing at least one security function associated with regulating access of the guest domain to the memory page.