linux-kernel - Re: [PATCH 22/43] KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped

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Message-ID: <20190617191724.GA26860@flask>
Date:   Mon, 17 Jun 2019 21:17:24 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        vkuznets@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH 22/43] KVM: nVMX: Don't dump VMCS if virtual APIC page
 can't be mapped

2019-06-13 19:03+0200, Paolo Bonzini:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> ... as a malicious userspace can run a toy guest to generate invalid
> virtual-APIC page addresses in L1, i.e. flood the kernel log with error
> messages.
> 
> Fixes: 690908104e39d ("KVM: nVMX: allow tests to use bad virtual-APIC page address")
> Cc: stable@...r.kernel.org
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Makes me wonder why it looks like this in kvm/queue. :)

  commit 1971a835297f9098ce5a735d38916830b8313a65
  Author:     Sean Christopherson <sean.j.christopherson@...xxxxxx>
  AuthorDate: Tue May 7 09:06:26 2019 -0700
  Commit:     Paolo Bonzini <pbonzini@...hat.com>
  CommitDate: Thu Jun 13 16:23:13 2019 +0200
  
      KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped
      
      ... as a malicious userspace can run a toy guest to generate invalid
      virtual-APIC page addresses in L1, i.e. flood the kernel log with error
      messages.
      
      Fixes: 690908104e39d ("KVM: nVMX: allow tests to use bad virtual-APIC page address")
      Cc: stable@...xxxxxxxxxxxx
      Cc: Paolo Bonzini <pbonzini@...xxxxxxx>
      Signed-off-by: Sean Christopherson <sean.j.christopherson@...xxxxxx>
      Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>