ec4c2c5 4 security updates

Authored and Committed by myoung 4 years ago
    4 security updates
    
    multiple xenoprof issues [XSA-313, CVE-2020-11740, CVE-2020-11741]
    	(#1823912, #1823914)
    Missing memory barriers in read-write unlock paths [XSA-314,
    	CVE-2020-11739] (#1823784)
    Bad error path in GNTTABOP_map_grant [XSA-316, CVE-2020-11743] (#1823926)
    Bad continuation handling in GNTTABOP_copy [XSA-318, CVE-2020-11742]
    	(#1823943)
    
        
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