linux-kernel - Re: [PATCH 3.14 26/77] KVM: x86: Fix of previously incomplete fix for CVE-2014-8480

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Date:	Wed, 28 Jan 2015 10:51:10 +0200
From:	Nadav Amit <nadav.amit@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 3.14 26/77] KVM: x86: Fix of previously incomplete fix for CVE-2014-8480

This CVE only affect 3.17 and 3.18. It shouldn’t hurt, but you can omit this
patch from 3.14.

Regards,
Nadav

Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> 3.14-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Nadav Amit <nadav.amit@...il.com>
> 
> commit 63ea0a49ae0b145b91ff2b070c01b66fc75854b9 upstream.
> 
> STR and SLDT with rip-relative operand can cause a host kernel oops.
> Mark them as DstMem as well.
> 
> Signed-off-by: Nadav Amit <namit@...technion.ac.il>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
> arch/x86/kvm/emulate.c |    4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -3668,8 +3668,8 @@ static const struct opcode group5[] = {
> };
> 
> static const struct opcode group6[] = {
> -	DI(Prot,	sldt),
> -	DI(Prot,	str),
> +	DI(Prot | DstMem,	sldt),
> +	DI(Prot | DstMem,	str),
> 	II(Prot | Priv | SrcMem16, em_lldt, lldt),
> 	II(Prot | Priv | SrcMem16, em_ltr, ltr),
> 	N, N, N, N,


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