From fcd97ad58f76efcd58808941e4dd2bc6c544b9de Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Thu, 9 Jan 2020 09:57:12 -0500 Subject: [PATCH] KVM: Add build-time error check on kvm_run size It's already going to reach 2400 Bytes (which is over half of page size on 4K page archs), so maybe it's good to have this build-time check in case it overflows when adding new fields. Signed-off-by: Peter Xu Signed-off-by: Paolo Bonzini --- virt/kvm/kvm_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 929d7fccf7cd..4f3ac8b753b6 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2710,6 +2710,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) goto vcpu_decrement; } + BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE); page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM;