vm86 syscall kernel-panic and some more goodies waiting to be analyzed

[halfdog <me () halfdog net>]

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It seems that at least on 32-bit Debian-sid kernel in VirtualBox
guest, [1] triggers a kernel-panic. This simple POC does not allow
privilege escalation although there might be also some time-race
component involved, sometimes similar code seems to access
uninitialized memory or triggers NULL-dereferences. Therefore the
simple POC code could be extended for more extensive testing. See [2]
for more information.

hd

[1]
http://www.halfdog.net/Security/2013/Vm86SyscallTaskSwitchKernelPanic/Virtual86SwitchToEmmsFault.c
[2] http://www.halfdog.net/Security/2013/Vm86SyscallTaskSwitchKernelPanic/

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