KVM: VMX: do not use uninitialized gfn_to_hva_cache

An uninitialized gfn_to_hva_cache has ghc->len == 0, which causes
the accessors to croak very loudly.  While a BUG_ON is definitely
_too_ loud and a bug on its own, there is indeed an issue of using
the caches in such a way that they could not have been initialized,
because ghc->gpa == 0 might match and thus kvm_gfn_to_hva_cache_init
would not be called.

For the vmcs12_cache, the solution is simply to invoke
kvm_gfn_to_hva_cache_init unconditionally: we already know
that the cache does not match the current VMCS pointer.
For the shadow_vmcs12_cache, there is no similar condition
that checks the VMCS link pointer, so invalidate the cache
on VMXON.

Fixes: edf9a9d78975 ("KVM: nVMX: Use a gfn_to_hva_cache for vmptrld")
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Reported-by: syzbot+7b7db8bb4db6fd5e157b@syzkaller.appspotmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 1e2f669515665b233e591343458c5ccce54ee32c..315fa456d3682bcca61ed865bf4446aa6b051df2 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4857,6 +4857,7 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
        if (!vmx->nested.cached_vmcs12)
                goto out_cached_vmcs12;
 
+       vmx->nested.shadow_vmcs12_cache.gpa = INVALID_GPA;
        vmx->nested.cached_shadow_vmcs12 = kzalloc(VMCS12_SIZE, GFP_KERNEL_ACCOUNT);
        if (!vmx->nested.cached_shadow_vmcs12)
                goto out_cached_shadow_vmcs12;
@@ -5289,8 +5290,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
                struct gfn_to_hva_cache *ghc = &vmx->nested.vmcs12_cache;
                struct vmcs_hdr hdr;
 
-               if (ghc->gpa != vmptr &&
-                   kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, vmptr, VMCS12_SIZE)) {
+               if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, vmptr, VMCS12_SIZE)) {
                        /*
                         * Reads from an unbacked page return all 1s,
                         * which means that the 32 bits located at the