System, method, and computer program product for copying a modified page table entry to a translation look aside buffer

A computer program product embodied on a non-transitory computer readable medium for performing operations, comprising:

• identifying a page table entry corresponding to an original page associated with original code associated with kernel protection for a computer;
• invaliding a page mapping in an instruction translation look aside buffer by calling a processor instruction that invalidates the page mapping;
• modifying the page table entry to correspond to a different page associated with different code;
• accessing an instruction of the different code for copying the modified page table entry;
• restoring the modified page table entry to correspond to the original page associated with the original code;
• and
• verifying that the modified page table entry in a data translation look aside buffer points to the original code.

A system, comprising:

• a processor coupled to a memory such that the system is configured for:
• identifying a page table entry corresponding to an original page associated with original code associated with kernel protection for a computer,
• invaliding a page mapping in an instruction translation look aside buffer by calling a processor instruction that invalidates the page mapping,
• modifying the page table entry to correspond to a different page associated with different code,
• accessing an instruction of the different code for copying the modified page table entry,
• restoring the modified page table entry to correspond to the original page associated with the original code, and
• verifying that the modified page table entry in a data translation look aside buffer points to the original code.