linux-kernel - Re: [PATCH 05/14] KVM: x86: nSVM: don't copy virt

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Message-ID: <4d1e6dfa-bce1-e774-286c-80b966b80e6b@redhat.com>
Date:   Thu, 23 Sep 2021 16:06:44 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Borislav Petkov <bp@...en8.de>, Bandan Das <bsd@...hat.com>,
        open list <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>, Ingo Molnar <mingo@...hat.com>,
        Wei Huang <wei.huang2@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jim Mattson <jmattson@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH 05/14] KVM: x86: nSVM: don't copy virt_ext from vmcb12

On 14/09/21 17:48, Maxim Levitsky wrote:
> These field correspond to features that we don't expose yet to L2
> 
> While currently there are no CVE worthy features in this field,
> if AMD adds more features to this field, that could allow guest
> escapes similar to CVE-2021-3653 and CVE-2021-3656.
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>   arch/x86/kvm/svm/nested.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index 476e01f98035..4df59d9795b6 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -545,7 +545,6 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
>   		(svm->nested.ctl.int_ctl & int_ctl_vmcb12_bits) |
>   		(svm->vmcb01.ptr->control.int_ctl & int_ctl_vmcb01_bits);
>   
> -	svm->vmcb->control.virt_ext            = svm->nested.ctl.virt_ext;
>   	svm->vmcb->control.int_vector          = svm->nested.ctl.int_vector;
>   	svm->vmcb->control.int_state           = svm->nested.ctl.int_state;
>   	svm->vmcb->control.event_inj           = svm->nested.ctl.event_inj;
> 

Queued, thanks.

Paolo