From nobody Wed Oct 29 06:38:55 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1513447896330782.6618784557749; Sat, 16 Dec 2017 10:11:36 -0800 (PST) Received: from localhost ([::1]:51642 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eQGvr-0002Gx-Kp for importer@patchew.org; Sat, 16 Dec 2017 13:11:31 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46169) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eQGUE-0006ZT-1a for qemu-devel@nongnu.org; Sat, 16 Dec 2017 12:42:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eQGUA-0000Wm-4W for qemu-devel@nongnu.org; Sat, 16 Dec 2017 12:42:58 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:55134 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eQGU9-0000Vh-VJ for qemu-devel@nongnu.org; Sat, 16 Dec 2017 12:42:54 -0500 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vBGHdVRl122750 for ; Sat, 16 Dec 2017 12:42:49 -0500 Received: from e31.co.us.ibm.com (e31.co.us.ibm.com [32.97.110.149]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ew0c7bcba-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sat, 16 Dec 2017 12:42:49 -0500 Received: from localhost by e31.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sat, 16 Dec 2017 10:42:45 -0700 Received: from b03ledav001.gho.boulder.ibm.com (b03ledav001.gho.boulder.ibm.com [9.17.130.232]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id vBGHgj3k6488460; Sat, 16 Dec 2017 10:42:45 -0700 Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5C6DB6E040; Sat, 16 Dec 2017 10:42:45 -0700 (MST) Received: from sbct-3.watson.ibm.com (unknown [9.47.158.153]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP id 032276E035; Sat, 16 Dec 2017 10:42:44 -0700 (MST) From: Stefan Berger To: qemu-devel@nongnu.org Date: Sat, 16 Dec 2017 12:41:49 -0500 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1513446109-9013-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1513446109-9013-1-git-send-email-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 17121617-8235-0000-0000-00000CBE1537 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008213; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000244; SDB=6.00961142; UDB=6.00486146; IPR=6.00741136; BA=6.00005744; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00018575; XFM=3.00000015; UTC=2017-12-16 17:42:46 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17121617-8236-0000-0000-00003EDF05E8 Message-Id: <1513446109-9013-33-git-send-email-stefanb@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-12-16_11:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1712160265 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-001b2d01.pphosted.com id vBGHdVRl122750 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PULL v1 32/32] tpm: tpm_passthrough: Fail startup if FE buffer size < BE buffer size X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, Stefan Berger Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" If the requested buffer size of the frontend is smaller than the fixed buffer size of the host's TPM, fail the startup_tpm() interface function, which will make the device unusable. We fail it because the backend TPM could produce larger packets than what the frontend could pass to the OS. The current combination of TIS frontend and either passthrough or emulator backend will not lead to this case since the TIS can support any size of buffer. Signed-off-by: Stefan Berger Reviewed-by: Marc-Andr=C3=A9 Lureau --- hw/tpm/tpm_passthrough.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c index 886af9e..487aae2 100644 --- a/hw/tpm/tpm_passthrough.c +++ b/hw/tpm/tpm_passthrough.c @@ -304,6 +304,20 @@ static TPMBackend *tpm_passthrough_create(QemuOpts *op= ts) return TPM_BACKEND(obj); } =20 +static int tpm_passthrough_startup_tpm(TPMBackend *tb, size_t buffersize) +{ + TPMPassthruState *tpm_pt =3D TPM_PASSTHROUGH(tb); + + if (buffersize && buffersize < tpm_pt->tpm_buffersize) { + error_report("Requested buffer size of %zu is smaller than host TP= M's " + "fixed buffer size of %zu", + buffersize, tpm_pt->tpm_buffersize); + return -1; + } + + return 0; +} + static TpmTypeOptions *tpm_passthrough_get_tpm_options(TPMBackend *tb) { TpmTypeOptions *options =3D g_new0(TpmTypeOptions, 1); @@ -362,6 +376,7 @@ static void tpm_passthrough_class_init(ObjectClass *kla= ss, void *data) tbc->opts =3D tpm_passthrough_cmdline_opts; tbc->desc =3D "Passthrough TPM backend driver"; tbc->create =3D tpm_passthrough_create; + tbc->startup_tpm =3D tpm_passthrough_startup_tpm; tbc->reset =3D tpm_passthrough_reset; tbc->cancel_cmd =3D tpm_passthrough_cancel_cmd; tbc->get_tpm_established_flag =3D tpm_passthrough_get_tpm_established_= flag; --=20 2.5.5