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

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Message-Id: <1560445409-17363-23-git-send-email-pbonzini@redhat.com>
Date:   Thu, 13 Jun 2019 19:03:08 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        vkuznets@...hat.com, stable@...r.kernel.org
Subject: [PATCH 22/43] KVM: nVMX: Don't dump VMCS if virtual APIC page can't be mapped

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>
---
 arch/x86/kvm/vmx/nested.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 9478d8947595..0f4cb473bd36 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2880,9 +2880,6 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
 			 */
 			vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL,
 					CPU_BASED_TPR_SHADOW);
-		} else {
-			printk("bad virtual-APIC page address\n");
-			dump_vmcs();
 		}
 	}
 
-- 
1.8.3.1