linux-kernel - [PATCH 3.10 052/180] MIPS: KVM: Fix gfn range check in kseg0 tlb faults

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Message-Id: <1471793510-13022-53-git-send-email-w@1wt.eu>
Date:   Sun, 21 Aug 2016 17:29:42 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     James Hogan <james.hogan@...tec.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
        kvm@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 052/180] MIPS: KVM: Fix gfn range check in kseg0 tlb faults

From: James Hogan <james.hogan@...tec.com>

commit 0741f52d1b980dbeb290afe67d88fc2928edd8ab upstream.

Two consecutive gfns are loaded into host TLB, so ensure the range check
isn't off by one if guest_pmap_npages is odd.

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@...tec.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Cc: kvm@...r.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
[james.hogan@...tec.com: Backport to v3.10.y - v3.15.y]
Signed-off-by: James Hogan <james.hogan@...tec.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/mips/kvm/kvm_tlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kvm/kvm_tlb.c b/arch/mips/kvm/kvm_tlb.c
index 8aba2e5..5a3c373 100644
--- a/arch/mips/kvm/kvm_tlb.c
+++ b/arch/mips/kvm/kvm_tlb.c
@@ -312,7 +312,7 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
 	}
 
 	gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
-	if (gfn >= kvm->arch.guest_pmap_npages) {
+	if ((gfn | 1) >= kvm->arch.guest_pmap_npages) {
 		kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
 			gfn, badvaddr);
 		kvm_mips_dump_host_tlbs();
-- 
2.8.0.rc2.1.gbe9624a