9fbe31b 5 security fixes

Authored and Committed by myoung 4 years ago
    5 security fixes
    
    denial of service in find_next_bit() [XSA-307, CVE-2019-19581,
    	CVE-2019-19582] (#1782211)
    denial of service in HVM/PVH guest userspace code [XSA-308,
    	CVE-2019-19583] (#1782206)
    privilege escalation due to malicious PV guest [XSA-309, CVE-2019-19578]
    	(#1782210)
    Further issues with restartable PV type change operations [XSA-310,
    	CVE-2019-19580] (#1782207)
    vulnerability in dynamic height handling for AMD IOMMU pagetables
    	[XSA-311, CVE-2019-19577] (#1782208)
    
        
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