From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8D930C001DC for ; Wed, 26 Jul 2023 09:08:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qOaUl-0006iG-Us; Wed, 26 Jul 2023 05:07:48 -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 1qOaUg-0006hc-Mi for qemu-devel@nongnu.org; Wed, 26 Jul 2023 05:07:44 -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 1qOaUa-0008Kh-3n for qemu-devel@nongnu.org; Wed, 26 Jul 2023 05:07:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rFyJ0K83ELKssd3l8oHfjX0FbnxB3P4Tby5+v4BmC/g=; b=qHJwGYAClf7SvWRXeDxTuOw2eE 9kRyOf3H+xpWNApU+tvMIcK9IBZ8Iyf7WRKs26BhgTPHSwdISN7d6PkoQ+so/rDoVv+gasgxAcZ6Z 6DmvIXhLVIE46MnIPId4ilU15JxunBfruud65+5H2F7SyHNSF8aYvsh1vjbgm2pNaZgTCUKMtQDkz b0iYcko4Pb69ZJobkw82GizguJ/eHD/XE4xPJOGm54k23wUpLYX1ml7vo6DZHR0a/A8SrzJK/1Q8u UeHAN6KPyi6EA7Pq/3plassnelP6smsWT1+HWDxvK56I6WyPNyGJe9E2jKdiFaQBog1PdxeqFMMTx Y44zJQww==; Received: from [2001:8b0:10b:5:5130:14b8:ee1:2f18] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qOaUL-006LAm-R2; Wed, 26 Jul 2023 09:07:22 +0000 Message-ID: <93bcbaee0b800b4a951a76340f3988088dfb1689.camel@infradead.org> Subject: Re: i386/xen: prevent guest from binding loopback event channel to itself From: David Woodhouse To: paul@xen.org, Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , qemu-devel Date: Wed, 26 Jul 2023 10:07:21 +0100 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-5Z7VGSOF4QkTTLIa4ddJ" 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: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+4245a8984f1f6731c872+7276+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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-5Z7VGSOF4QkTTLIa4ddJ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-07-26 at 09:44 +0100, Paul Durrant wrote: > On 25/07/2023 11:05, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > Fuzzing showed that a guest could bind an interdomain port to itself, b= y > > 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. > >=20 > > Signed-off-by: David Woodhouse > > --- > > =C2=A0 hw/i386/kvm/xen_evtchn.c | 11 +++++++++-- > > =C2=A0 1 file changed, 9 insertions(+), 2 deletions(-) > >=20 >=20 > Reviewed-by: Paul Durrant >=20 Thanks. I'll change the title prefix to 'hw/xen' since it's in hw/ not target/i386. Please can I have also have a review for https://lore.kernel.org/qemu-devel/20076888f6bdf06a65aafc5cf954260965d45b97= .camel@infradead.org/ I'll then send these outstanding patches from my tree as a series for 8.1: David Woodhouse (4): hw/xen: Clarify (lack of) error handling in transaction_commit() hw/xen: fix off-by-one in xen_evtchn_set_gsi() i386/xen: consistent locking around Xen singleshot timers hw/xen: prevent guest from binding loopback event channel to itself --=-5Z7VGSOF4QkTTLIa4ddJ Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 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