From: Sean Christopherson <seanjc@xxxxxxxxxx>
commit eb3992e833d3a17f9b0a3e0371d0b1d3d566f740 upstream.
Resume the guest immediately when injecting a #GP on ECREATE due to an
invalid enclave size, i.e. don't attempt ECREATE in the host. The #GP is
a terminal fault, e.g. skipping the instruction if ECREATE is successful
would result in KVM injecting #GP on the instruction following ECREATE.
Fixes: 70210c044b4e ("KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Kai Huang <kai.huang@xxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220930233132.1723330-1-seanjc@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx/sgx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/x86/kvm/vmx/sgx.c
+++ b/arch/x86/kvm/vmx/sgx.c
@@ -188,8 +188,10 @@ static int __handle_encls_ecreate(struct
/* Enforce CPUID restriction on max enclave size. */
max_size_log2 = (attributes & SGX_ATTR_MODE64BIT) ? sgx_12_0->edx >> 8 :
sgx_12_0->edx;
- if (size >= BIT_ULL(max_size_log2))
+ if (size >= BIT_ULL(max_size_log2)) {
kvm_inject_gp(vcpu, 0);
+ return 1;
+ }
/*
* sgx_virt_ecreate() returns:
