[PATCH v2 2/3] KVM: PPC: Book3S HV: Add sanity check to copy_tofrom_guest

[Fabiano Rosas]

Both paths into __kvmhv_copy_tofrom_guest_radix ensure that we arrive
with an effective address that is smaller than our total addressable
space and addresses quadrant 0.

- The H_COPY_TOFROM_GUEST hypercall path rejects the call with
H_PARAMETER if the effective address has any of the twelve most
significant bits set.

- The kvmhv_copy_tofrom_guest_radix path clears the top twelve bits
before calling the internal function.

Although the callers make sure that the effective address is sane, any
future use of the function is exposed to a programming error, so add a
sanity check.

Suggested-by: Nicholas Piggin <npiggin at gmail.com>
Signed-off-by: Fabiano Rosas <farosas at linux.ibm.com>
---
 arch/powerpc/kvm/book3s_64_mmu_radix.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 44eb7b1ef289..1b1c9e9e539b 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -44,6 +44,9 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
 					  (to != NULL) ? __pa(to): 0,
 					  (from != NULL) ? __pa(from): 0, n);
 
+	if (eaddr & (0xFFFUL << 52))
+		return ret;
+
 	quadrant = 1;
 	if (!pid)
 		quadrant = 2;
-- 
2.29.2