From nobody Fri May 17 05:26:34 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1690279540133217.56907539773954; Tue, 25 Jul 2023 03:05:40 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qOEun-00045D-EM; Tue, 25 Jul 2023 06:05:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qOEul-000455-Tn for qemu-devel@nongnu.org; Tue, 25 Jul 2023 06:05:11 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qOEui-0003Qt-Fz for qemu-devel@nongnu.org; Tue, 25 Jul 2023 06:05:09 -0400 Received: from [2001:8b0:10b:1:7f07:4fc6:8b21:3b6b] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qOEud-005MCP-1A; Tue, 25 Jul 2023 10:05:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:To:From: Subject:Message-ID:Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=rlPc8DndEDYGCeSGmqv2UqSj/QF8RAo5s9ZqdlfqcZ8=; b=BkFmTM5rwM8s5u2bxSJBkRqpoE R3Sx6lObyqQRV8bnjgKFEoHsOnTJLpBA21woq3mG6n8kjtMeLovn5s0hbPtmguyoP6O0s+oNpERqT GItaJHxO3/wRkeXwA0Hp2jP/1rlwRGU7DH69ZaqYsJGPU2OTW6Ix/k6ZBfJ/O9b3hqilacmJZCfWX YG6HRAQkL3kc53v76Z36uhxcFCOaZ/7d5x2LBabkfgw0VklY8IbI76m5CXwGE+scsp3L9aY2z6kuw L5clVkjA1H1im+s6WeDReZjRgOuHOEtlMUOjjhcRQUHh8pvodF9Po9rFAMYbBVXQ+ewWRXCWEFsrb ymCK1XPw==; Message-ID: Subject: i386/xen: prevent guest from binding loopback event channel to itself From: David Woodhouse To: Paul Durrant , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , qemu-devel Date: Tue, 25 Jul 2023 11:05:02 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-B5asVEyT8XMcVZDiWz85" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+b7341d96be85b1396a27+7275+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1690279541217100001 --=-B5asVEyT8XMcVZDiWz85 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Fuzzing showed that a guest could bind an interdomain port to itself, by guessing the next port to be allocated and putting that as the 'remote' port number. By chance, that works because the newly-allocated port has type EVTCHNSTAT_unbound. It shouldn't. Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- hw/i386/kvm/xen_evtchn.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c index 0e9c108614..70b4b8a6ef 100644 --- a/hw/i386/kvm/xen_evtchn.c +++ b/hw/i386/kvm/xen_evtchn.c @@ -1408,8 +1408,15 @@ int xen_evtchn_bind_interdomain_op(struct evtchn_bin= d_interdomain *interdomain) XenEvtchnPort *rp =3D &s->port_table[interdomain->remote_port]; XenEvtchnPort *lp =3D &s->port_table[interdomain->local_port]; =20 - if (rp->type =3D=3D EVTCHNSTAT_unbound && rp->type_val =3D=3D 0) { - /* It's a match! */ + /* + * The 'remote' port for loopback must be an unbound port allocate= d for + * communication with the local domain (as indicated by rp->type_v= al + * being zero, not PORT_INFO_TYPEVAL_REMOTE_QEMU), and must *not* = be + * the port that was just allocated for the local end. + */ + if (interdomain->local_port !=3D interdomain->remote_port && + rp->type =3D=3D EVTCHNSTAT_unbound && rp->type_val =3D=3D 0) { + rp->type =3D EVTCHNSTAT_interdomain; rp->type_val =3D interdomain->local_port; =20 --=20 2.34.1 --=-B5asVEyT8XMcVZDiWz85 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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