[PATCH] KVM: arm64: Fix alignment of kvm_hyp_memcache allocations

[Quentin Perret <qperret@google.com>]

When allocating guest stage-2 page-table pages at EL2, pKVM can consume
pages from the host-provided kvm_hyp_memcache. As pgtable.c expects
zeroed pages, guest_s2_zalloc_page() actively implements this zeroing
with a PAGE_SIZE memset. Unfortunately, we don't check the page
alignment of the host-provided address before doing so, which could
lead to the memset overrunning the page if the host was malicious.

Fix this by simply force-aligning all kvm_hyp_memcache allocations to
page boundaries.

Fixes: 60dfe093ec13 ("KVM: arm64: Instantiate guest stage-2 page-tables at EL2")
Reported-by: Ben Simner <ben.simner@cl.cam.ac.uk>
Signed-off-by: Quentin Perret <qperret@google.com>
---
 arch/arm64/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7cfa024de4e3..d9db6dfbad09 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -100,7 +100,7 @@ static inline void push_hyp_memcache(struct kvm_hyp_memcache *mc,
 static inline void *pop_hyp_memcache(struct kvm_hyp_memcache *mc,
 				     void *(*to_va)(phys_addr_t phys))
 {
-	phys_addr_t *p = to_va(mc->head);
+	phys_addr_t *p = to_va(mc->head & PAGE_MASK);
 
 	if (!mc->nr_pages)
 		return NULL;
-- 
2.48.1.502.g6dc24dfdaf-goog