linux-kernel - Re: [PATCH] KVM: x86: Forcibly leave nested virt when SMM state is toggled

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Message-ID: <3561688b-b52c-8858-3da2-afda7c3e681f@linaro.org>
Date:   Fri, 18 Feb 2022 09:22:30 -0800
From:   Tadeusz Struk <tadeusz.struk@...aro.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+8112db3ab20e70d50c31@...kaller.appspotmail.com
Subject: Re: [PATCH] KVM: x86: Forcibly leave nested virt when SMM state is
 toggled

On 2/18/22 08:58, Sean Christopherson wrote:
> This SMM-specific patch fixes something different, the bug that you are still
> hitting is the FNAME(cmpxchg_gpte) mess.  The uaccess CMPXCHG series[*] that
> properly fixes that issue hasn't been merged yet.
> 
>    ==================================================================
>    BUG: KASAN: use-after-free in ept_cmpxchg_gpte.constprop.0+0x3c3/0x590
>    Write of size 8 at addr ffff888010000000 by task repro/5633
> 
> [*]https://lore.kernel.org/all/20220202004945.2540433-1-seanjc@google.com
> 

Ok, that's good. I will keep an eye on it and give it a try then.
-- 
Thanks,
Tadeusz