From owner-svn-src-stable-11@freebsd.org Tue Sep 15 21:28:49 2020 Return-Path: Delivered-To: svn-src-stable-11@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 3BDDC3E0C2E; Tue, 15 Sep 2020 21:28:49 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BrbvP0t5Hz3RTD; Tue, 15 Sep 2020 21:28:49 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 02931E5EF; Tue, 15 Sep 2020 21:28:49 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 08FLSmkL034137; Tue, 15 Sep 2020 21:28:48 GMT (envelope-from emaste@FreeBSD.org) Received: (from emaste@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 08FLSmJO034135; Tue, 15 Sep 2020 21:28:48 GMT (envelope-from emaste@FreeBSD.org) Message-Id: <202009152128.08FLSmJO034135@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: emaste set sender to emaste@FreeBSD.org using -f From: Ed Maste Date: Tue, 15 Sep 2020 21:28:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r365777 - in stable: 11/sys/amd64/vmm/amd 11/sys/amd64/vmm/intel 12/sys/amd64/vmm/amd 12/sys/amd64/vmm/intel X-SVN-Group: stable-11 X-SVN-Commit-Author: emaste X-SVN-Commit-Paths: in stable: 11/sys/amd64/vmm/amd 11/sys/amd64/vmm/intel 12/sys/amd64/vmm/amd 12/sys/amd64/vmm/intel X-SVN-Commit-Revision: 365777 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 21:28:49 -0000 Author: emaste Date: Tue Sep 15 21:28:47 2020 New Revision: 365777 URL: https://svnweb.freebsd.org/changeset/base/365777 Log: MFC r365775: bhyve: do not permit write access to VMCB / VMCS Reported by: Patrick Mooney Submitted by: jhb Security: CVE-2020-24718 Modified: stable/11/sys/amd64/vmm/amd/svm.c stable/11/sys/amd64/vmm/intel/vmx.c Directory Properties: stable/11/ (props changed) Changes in other areas also in this revision: Modified: stable/12/sys/amd64/vmm/amd/svm.c stable/12/sys/amd64/vmm/intel/vmx.c Directory Properties: stable/12/ (props changed) Modified: stable/11/sys/amd64/vmm/amd/svm.c ============================================================================== --- stable/11/sys/amd64/vmm/amd/svm.c Tue Sep 15 21:07:30 2020 (r365776) +++ stable/11/sys/amd64/vmm/amd/svm.c Tue Sep 15 21:28:47 2020 (r365777) @@ -2202,8 +2202,11 @@ svm_setreg(void *arg, int vcpu, int ident, uint64_t va return (svm_modify_intr_shadow(svm_sc, vcpu, val)); } - if (vmcb_write(svm_sc, vcpu, ident, val) == 0) { - return (0); + /* Do not permit user write access to VMCB fields by offset. */ + if (!VMCB_ACCESS_OK(ident)) { + if (vmcb_write(svm_sc, vcpu, ident, val) == 0) { + return (0); + } } reg = swctx_regptr(svm_get_guest_regctx(svm_sc, vcpu), ident); Modified: stable/11/sys/amd64/vmm/intel/vmx.c ============================================================================== --- stable/11/sys/amd64/vmm/intel/vmx.c Tue Sep 15 21:07:30 2020 (r365776) +++ stable/11/sys/amd64/vmm/intel/vmx.c Tue Sep 15 21:28:47 2020 (r365777) @@ -3215,6 +3215,10 @@ vmx_setreg(void *arg, int vcpu, int reg, uint64_t val) if (vmxctx_setreg(&vmx->ctx[vcpu], reg, val) == 0) return (0); + /* Do not permit user write access to VMCS fields by offset. */ + if (reg < 0) + return (EINVAL); + error = vmcs_setreg(&vmx->vmcs[vcpu], running, reg, val); if (error == 0) {