c51d149 xen: various flaws (#1481765)

Authored and Committed by myoung 6 years ago
    xen: various flaws (#1481765)
    multiple problems with transitive grants [XSA-226, CVE-2017-12135]
    x86: PV privilege escalation via map_grant_ref [XSA-227, CVE-2017-12137]
    grant_table: Race conditions with maptrack free list handling
    	[XSA-228, CVE-2017-12136]
    grant_table: possibly premature clearing of GTF_writing / GTF_reading
    	[XSA-230, CVE-2017-12855]
    
        
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