Re: [Stable-review] [141/145] KVM: x86 emulator: Check CPL levelduring privilege instruction emulation

[Greg KH]

On Sat, Mar 13, 2010 at 08:37:57PM +0000, Ben Hutchings wrote:
> On Fri, 2010-03-12 at 16:27 -0800, Greg KH wrote:
> > 2.6.32-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ----------------
> > From: Gleb Natapov <gleb@xxxxxxxxxx>
> > 
> > commit e92805ac1228626c59c865f2f4e9059b9fb8c97b upstream.
> > 
> > Add CPL checking in case emulator is tricked into emulating
> > privilege instruction from userspace.
> 
> There were more security fixes released along with this, which surely
> belong in a stable update:
> 
> 1871c6020d7308afb99127bba51f04548e7ca84e KVM: x86 emulator: fix memory access during x86 emulation
> f850e2e603bf5a05b0aee7901857cf85715aa694 KVM: x86 emulator: Check IOPL level during io instruction emulation
> d4c6a1549c056f1d817e8f6f2f97d8b44933472f KVM: x86 emulator: Fix popf emulation

Yes, there were a number of kvm patches that I could not apply either
because they did not apply, or because they caused build errors.  These
are some of them.  I have asked the KVM developers to properly backport
them as I know nothing about KVM.  Hopefully that will be done for the
next round of stable releases.

thanks,

greg k-h
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