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 smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 0934FC00140 for ; Mon, 8 Aug 2022 13:52:22 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 9A33740121; Mon, 8 Aug 2022 13:52:22 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 9A33740121 Authentication-Results: smtp2.osuosl.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=qVPVXG4D X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rkANsRzYwn1j; Mon, 8 Aug 2022 13:52:21 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp2.osuosl.org (Postfix) with ESMTPS id 2B902409DE; Mon, 8 Aug 2022 13:52:21 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 2B902409DE Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id F2E99C0032; Mon, 8 Aug 2022 13:52:20 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8162FC002D for ; Mon, 8 Aug 2022 13:52:19 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 486D6825FE for ; Mon, 8 Aug 2022 13:52:19 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org 486D6825FE Authentication-Results: smtp1.osuosl.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=qVPVXG4D X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Nj_6CP1sHY18 for ; Mon, 8 Aug 2022 13:52:18 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org C6F15825E8 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by smtp1.osuosl.org (Postfix) with ESMTPS id C6F15825E8 for ; Mon, 8 Aug 2022 13:52:17 +0000 (UTC) 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:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=zTVFjv3TnW37bQZJpq+U63VfBf3ts5YE+IfjiLjxYCQ=; b=qVPVXG4DNvVp6QgYpbdPrRo40w qDCRWeW/QnNwKxHsJUjtTqYOxlrtb33oPNtqUMqvFJGkdIIMSLVn6rBmN4ca2o4+GsoB1VMUOIGC5 Ez6z/xIijXISxFzLE9GFCkGMMsUMiZq8JdAZcSfw1HtNQRczns9MNRYJhE4e5A2iMB5dw/7EooClr 4SVaF82abbYCL6MgsCwWhEjj9C6HDjLgIuEyXJPBIIuV/rBEPNCp1UibsKZoSMIUuKL50Cp1ehk0O YlhiDUj3N29l+azcR+G8A1IQESPdspOjEuYXAOGqiu/mEAFRmloXc43B+dPiX0JW8UC+EEKe89GY1 L9nJdU1Q==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oL3AL-00DxNt-5l; Mon, 08 Aug 2022 13:51:33 +0000 Message-ID: <9bad724858b6a06c25ead865b2b3d9dfc216d01c.camel@infradead.org> Subject: Re: [PATCH] KVM: x86/xen: Fix bug in kvm_xen_vcpu_set_attr() From: David Woodhouse To: Coleman Dietsch , kvm@vger.kernel.org, metikaya Date: Mon, 08 Aug 2022 14:51:31 +0100 In-Reply-To: <20220728194736.383727-1-dietschc@csp.edu> References: <20220728194736.383727-1-dietschc@csp.edu> User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Cc: x86@kernel.org, Sean Christopherson , Dave Hansen , linux-kernel@vger.kernel.org, syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com, Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Paolo Bonzini , Thomas Gleixner , Pavel Skripkin , linux-kernel-mentees@lists.linuxfoundation.org X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8436510058148461987==" Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" --===============8436510058148461987== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ksDH9OIWyoYY1HG664Kv" --=-ksDH9OIWyoYY1HG664Kv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2022-07-28 at 14:47 -0500, Coleman Dietsch wrote: > This crash appears to be happening when vcpu->arch.xen.timer is > already set and kvm_xen_init_timer(vcpu) is called. >=20 > During testing with the syzbot reproducer code it seemed apparent > that the else if statement in the KVM_XEN_VCPU_ATTR_TYPE_TIMER switch > case was not being reached, which is where the > kvm_xen_stop_timer(vcpu) call is located. >=20 > Link: https://syzkaller.appspot.com/bug?id=3D8234a9dfd3aafbf092cc5a7cd984= 2e3ebc45fc42 >=20 > Reported-and-tested-by: syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail= .com >=20 > Signed-off-by: Coleman Dietsch Modulo the cosmetic issues discussed, Acked-by: David Woodhouse Thanks. > --- > arch/x86/kvm/xen.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) >=20 > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c > index 610beba35907..4b4b985813c5 100644 > --- a/arch/x86/kvm/xen.c > +++ b/arch/x86/kvm/xen.c > @@ -707,6 +707,12 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, str= uct kvm_xen_vcpu_attr *data) > break; > =20 > case KVM_XEN_VCPU_ATTR_TYPE_TIMER: > + /* Stop current timer if it is enabled */ > + if (kvm_xen_timer_enabled(vcpu)) { > + kvm_xen_stop_timer(vcpu); > + vcpu->arch.xen.timer_virq =3D 0; > + } > + > if (data->u.timer.port) { > if (data->u.timer.priority !=3D KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVE= L) { > r =3D -EINVAL; > @@ -720,9 +726,6 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, stru= ct kvm_xen_vcpu_attr *data) > kvm_xen_start_timer(vcpu, data->u.timer.expires_ns, > data->u.timer.expires_ns - > get_kvmclock_ns(vcpu->kvm)); > - } else if (kvm_xen_timer_enabled(vcpu)) { > - kvm_xen_stop_timer(vcpu); > - vcpu->arch.xen.timer_virq =3D 0; > } > =20 > r =3D 0; >=20 --=-ksDH9OIWyoYY1HG664Kv Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT 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