xenxen: Security fix for local denial of service problem in alignment fault handlerxen: Sicherheitsupdate das ein Problem in der Alignment Fault Behandlung behebtThis update fixes an issue on x86_64 in which a user-level
application can crash the guest OS when running Xen.
The AC (alignment check) flag in RFLAGS was not being
cleared on entry to the guest kernel, causing unwanted
faults because the kernel runs in ring 3 on Xen.
Dieses Update behebt ein Problem auf x86_64, wodurch eine
Benutzerapplikation das Guest OS in XEN zum Absturz bringen
kann.
Das AC (Alignment Test) Flag in RFLAGS wurde bem Wechseln
in den Gastkernel, nicht gelöscht, was ungewünschte
Alignmentfaults erzeugte, da der Kernel in Xen in Ring 3
läuft.
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