The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 2020
Filed:
Apr. 23, 2018
Vmware, Inc., Palo Alto, CA (US);
Nadav Amit, Mountain View, CA (US);
Dan Tsafrir, Sunnyvale, CA (US);
Michael Wei, Palo Alto, CA (US);
VMWARE, INC., Palo Alto, CA (US);
Abstract
Embodiments are disclosed to mitigate the meltdown vulnerability by selectively using page table isolation. Page table isolation is enabled for 64-bit applications, so that unprivileged areas in the kernel address space cannot be accessed in user mode due to speculative execution by the processor. On the other hand, page table isolation is disabled for 32-bit applications thereby providing mapping into unprivileged areas in the kernel address space. However, speculative execution is limited to a 32-bit address space in a 32-bit application, and s access to unprivileged areas in the kernel address space can be inhibited.