linux-kernel - Re: [PATCH] KVM: x86: fix wbinvd_dirty

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Message-ID: <20161024152325.GD2247@potion>
Date:   Mon, 24 Oct 2016 17:23:26 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Ido Yariv <ido@...ery.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: fix wbinvd_dirty_mask use-after-free

2016-10-21 12:39-0400, Ido Yariv:
> vcpu->arch.wbinvd_dirty_mask may still be used after freeing it,
> corrupting memory. For example, the following call trace may set a bit
> in an already freed cpu mask:
>     kvm_arch_vcpu_load
>     vcpu_load
>     vmx_free_vcpu_nested
>     vmx_free_vcpu
>     kvm_arch_vcpu_free
> 
> Fix this by deferring freeing of wbinvd_dirty_mask.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Ido Yariv <ido@...ery.com>
> ---

Applied, thanks.