* [PATCH 4.19 071/103] KVM/nVMX: Do not validate that posted_intr_desc_addr is page aligned
[not found] <20190129113159.567154026@linuxfoundation.org>
@ 2019-01-29 11:35 ` Greg Kroah-Hartman
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From: Greg Kroah-Hartman @ 2019-01-29 11:35 UTC (permalink / raw)
To: linux-kernel
Cc: Greg Kroah-Hartman, stable, Paolo Bonzini,
Radim Krčmář, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, H. Peter Anvin, x86, kvm, KarimAllah Ahmed,
Jim Mattson, Krish Sadhuhan
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: KarimAllah Ahmed <karahmed@amazon.de>
commit 22a7cdcae6a4a3c8974899e62851d270956f58ce upstream.
The spec only requires the posted interrupt descriptor address to be
64-bytes aligned (i.e. bits[0:5] == 0). Using page_address_valid also
forces the address to be page aligned.
Only validate that the address does not cross the maximum physical address
without enforcing a page alignment.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Fixes: 6de84e581c0 ("nVMX x86: check posted-interrupt descriptor addresss on vmentry of L2")
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Krish Sadhuhan <krish.sadhukhan@oracle.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
From: Mark Mielke <mark.mielke@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/vmx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -11733,7 +11733,7 @@ static int nested_vmx_check_apicv_contro
!nested_exit_intr_ack_set(vcpu) ||
(vmcs12->posted_intr_nv & 0xff00) ||
(vmcs12->posted_intr_desc_addr & 0x3f) ||
- (!page_address_valid(vcpu, vmcs12->posted_intr_desc_addr))))
+ (vmcs12->posted_intr_desc_addr >> cpuid_maxphyaddr(vcpu))))
return -EINVAL;
/* tpr shadow is needed by all apicv features. */
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