linux-kernel - Re: [Stable-review] [141/145] KVM: x86 emulator: Check CPL level during privilege instruction emulation

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Date:	Sat, 13 Mar 2010 14:16:45 -0800
From:	Greg KH <gregkh@...e.de>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Gleb Natapov <gleb@...hat.com>, Avi Kivity <avi@...hat.com>,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org, alan@...rguk.ukuu.org.uk
Subject: Re: [Stable-review] [141/145] KVM: x86 emulator: Check CPL level
	during privilege instruction emulation

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@...hat.com>
> > 
> > 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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