[PATCH 3.14 24/34] arm/arm64: KVM: Ensure memslots are within KVM_PHYS_SIZE

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoffer Dall <christoffer.dall@linaro.org>

commit c3058d5da2222629bc2223c488a4512b59bb4baf upstream.

[Since we don't backport commit 8eef912 (arm/arm64: KVM: map MMIO regions
at creation time) for linux-3.14.y, the context of this patch is
different, while the change itself is same.]

When creating or moving a memslot, make sure the IPA space is within the
addressable range of the guest.  Otherwise, user space can create too
large a memslot and KVM would try to access potentially unallocated page
table entries when inserting entries in the Stage-2 page tables.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm/kvm/mmu.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -926,6 +926,9 @@ int kvm_handle_guest_abort(struct kvm_vc
 
 	memslot = gfn_to_memslot(vcpu->kvm, gfn);
 
+	/* Userspace should not be able to register out-of-bounds IPAs */
+	VM_BUG_ON(fault_ipa >= KVM_PHYS_SIZE);
+
 	ret = user_mem_abort(vcpu, fault_ipa, memslot, fault_status);
 	if (ret == 0)
 		ret = 1;
@@ -1150,6 +1153,14 @@ int kvm_arch_prepare_memory_region(struc
 				   struct kvm_userspace_memory_region *mem,
 				   enum kvm_mr_change change)
 {
+	/*
+	 * Prevent userspace from creating a memory region outside of the IPA
+	 * space addressable by the KVM guest IPA space.
+	 */
+	if (memslot->base_gfn + memslot->npages >=
+	    (KVM_PHYS_SIZE >> PAGE_SHIFT))
+		return -EFAULT;
+
 	return 0;
 }