From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:35302 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725883AbgLROS7 (ORCPT ); Fri, 18 Dec 2020 09:18:59 -0500 From: Claudio Imbrenda Subject: [PATCH v1 1/4] s390/kvm: VSIE: stop leaking host addresses Date: Fri, 18 Dec 2020 15:18:08 +0100 Message-Id: <20201218141811.310267-2-imbrenda@linux.ibm.com> In-Reply-To: <20201218141811.310267-1-imbrenda@linux.ibm.com> References: <20201218141811.310267-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-ID: To: linux-kernel@vger.kernel.org Cc: borntraeger@de.ibm.com, frankja@linux.ibm.com, david@redhat.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, stable@vger.kernel.org The addresses in the SIE control block of the host should not be forwarded to the guest. They are only meaningful to the host, and moreover it would be a clear security issue. Subsequent patches will actually put the right values in the guest SIE control block. Fixes: a3508fbe9dc6d ("KVM: s390: vsie: initial support for nested virtualization") Cc: stable@vger.kernel.org Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/vsie.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 4f3cbf6003a9..ada49583e530 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -416,11 +416,6 @@ static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) memcpy((void *)((u64)scb_o + 0xc0), (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); break; - case ICPT_PARTEXEC: - /* MVPG only */ - memcpy((void *)((u64)scb_o + 0xc0), - (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0); - break; } if (scb_s->ihcpu != 0xffffU) -- 2.26.2