KVM: x86: Check that the high 32bits are clear in kvm_arch_vcpu_ioctl_run()

The "kvm_run->kvm_valid_regs" and "kvm_run->kvm_dirty_regs" variables are
u64 type.  We are only using the lowest 3 bits but we want to ensure that
the users are not passing invalid bits so that we can use the remaining
bits in the future.

However "sync_valid_fields" and kvm_sync_valid_fields() are u32 type so
the check only ensures that the lower 32 bits are clear.  Fix this by
changing the types to u64.

Fixes: 74c1807f6c4f ("KVM: x86: block KVM_CAP_SYNC_REGS if guest state is protected")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/ec25aad1-113e-4c6e-8941-43d432251398@stanley.mountain
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index df5b99ea1f18126d988108cfcefcb6f57c6e57f1..9896fd574bfc9da0900091b65dfc3a58d001863f 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4597,7 +4597,7 @@ static bool kvm_is_vm_type_supported(unsigned long type)
        return type < 32 && (kvm_caps.supported_vm_types & BIT(type));
 }
 
-static inline u32 kvm_sync_valid_fields(struct kvm *kvm)
+static inline u64 kvm_sync_valid_fields(struct kvm *kvm)
 {
        return kvm && kvm->arch.has_protected_state ? 0 : KVM_SYNC_X86_VALID_FIELDS;
 }
@@ -11493,7 +11493,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 {
        struct kvm_queued_exception *ex = &vcpu->arch.exception;
        struct kvm_run *kvm_run = vcpu->run;
-       u32 sync_valid_fields;
+       u64 sync_valid_fields;
        int r;
 
        r = kvm_mmu_post_init_vm(vcpu->kvm);