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:
Aug. 15, 2017
Filed:
Mar. 19, 2015
Facebook, Inc., Menlo Park, CA (US);
Oded Horovitz, Palo Alto, CA (US);
Sahil Rihan, Menlo Park, CA (US);
Stephen A. Weis, San Francisco, CA (US);
Carl A. Waldspurger, Palo Alto, CA (US);
Facebook, Inc., Menlo Park, CA (US);
Abstract
Methods and systems for securing sensitive data from security risks associated with direct memory access ('DMA') by input/output ('I/O') devices are provided. An enhanced software cryptoprocessor system secures sensitive data using various techniques, including (1) protecting sensitive data by preventing DMA by an I/O device to the portion of the cache that stores the sensitive data, (2) protecting device data by preventing cross-device access to device data using DMA isolation, and (3) protecting the cache by preventing the pessimistic eviction of cache lines on DMA writes to main memory.