From nobody Tue Nov 4 15:45:45 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 1503969072660204.05969910673355; Mon, 28 Aug 2017 18:11:12 -0700 (PDT) Received: from localhost ([::1]:42201 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmV3e-00087J-6i for importer@patchew.org; Mon, 28 Aug 2017 21:11:10 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49079) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmUCx-0001u8-1M for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dmUCt-0006JE-0f for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:43 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:35504 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 1dmUCs-0006Id-Q0 for qemu-devel@nongnu.org; Mon, 28 Aug 2017 20:16:38 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v7T0E8DR017766 for ; Mon, 28 Aug 2017 20:16:38 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0b-001b2d01.pphosted.com with ESMTP id 2cmub2wwdp-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 28 Aug 2017 20:16:38 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 28 Aug 2017 20:16:34 -0400 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v7T0GXCn30867496; Tue, 29 Aug 2017 00:16:33 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 42161AE03C; Mon, 28 Aug 2017 20:16:57 -0400 (EDT) Received: from localhost (unknown [9.80.85.217]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP id 0A28EAE034; Mon, 28 Aug 2017 20:16:56 -0400 (EDT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 28 Aug 2017 19:14:47 -0500 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1503965694-10794-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1503965694-10794-1-git-send-email-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17082900-0008-0000-0000-00000275D344 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007630; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000226; SDB=6.00909028; UDB=6.00455849; IPR=6.00689279; BA=6.00005557; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016909; XFM=3.00000015; UTC=2017-08-29 00:16:36 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082900-0009-0000-0000-000036857B51 Message-Id: <1503965694-10794-73-git-send-email-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-08-28_13:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=3 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1708290001 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH 72/79] input: limit kbd queue depth 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: P J P , Huawei PSIRT , qemu-stable@nongnu.org, Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Gerd Hoffmann Apply a limit to the number of items we accept into the keyboard queue. Impact: Without this limit vnc clients can exhaust host memory by sending keyboard events faster than qemu feeds them to the guest. Fixes: CVE-2017-8379 Cc: P J P Cc: Huawei PSIRT Reported-by: jiangxin1@huawei.com Signed-off-by: Gerd Hoffmann Message-id: 20170428084237.23960-1-kraxel@redhat.com (cherry picked from commit fa18f36a461984eae50ab957e47ec78dae3c14fc) Signed-off-by: Michael Roth --- ui/input.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/ui/input.c b/ui/input.c index ed88cda..fb1f404 100644 --- a/ui/input.c +++ b/ui/input.c @@ -41,6 +41,8 @@ static QTAILQ_HEAD(QemuInputEventQueueHead, QemuInputEven= tQueue) kbd_queue =3D QTAILQ_HEAD_INITIALIZER(kbd_queue); static QEMUTimer *kbd_timer; static uint32_t kbd_default_delay_ms =3D 10; +static uint32_t queue_count; +static uint32_t queue_limit =3D 1024; =20 QemuInputHandlerState *qemu_input_handler_register(DeviceState *dev, QemuInputHandler *handl= er) @@ -268,6 +270,7 @@ static void qemu_input_queue_process(void *opaque) break; } QTAILQ_REMOVE(queue, item, node); + queue_count--; g_free(item); } } @@ -282,6 +285,7 @@ static void qemu_input_queue_delay(struct QemuInputEven= tQueueHead *queue, item->delay_ms =3D delay_ms; item->timer =3D timer; QTAILQ_INSERT_TAIL(queue, item, node); + queue_count++; =20 if (start_timer) { timer_mod(item->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) @@ -298,6 +302,7 @@ static void qemu_input_queue_event(struct QemuInputEven= tQueueHead *queue, item->src =3D src; item->evt =3D evt; QTAILQ_INSERT_TAIL(queue, item, node); + queue_count++; } =20 static void qemu_input_queue_sync(struct QemuInputEventQueueHead *queue) @@ -306,6 +311,7 @@ static void qemu_input_queue_sync(struct QemuInputEvent= QueueHead *queue) =20 item->type =3D QEMU_INPUT_QUEUE_SYNC; QTAILQ_INSERT_TAIL(queue, item, node); + queue_count++; } =20 void qemu_input_event_send_impl(QemuConsole *src, InputEvent *evt) @@ -381,7 +387,7 @@ void qemu_input_event_send_key(QemuConsole *src, KeyVal= ue *key, bool down) qemu_input_event_send(src, evt); qemu_input_event_sync(); qapi_free_InputEvent(evt); - } else { + } else if (queue_count < queue_limit) { qemu_input_queue_event(&kbd_queue, src, evt); qemu_input_queue_sync(&kbd_queue); } @@ -409,8 +415,10 @@ void qemu_input_event_send_key_delay(uint32_t delay_ms) kbd_timer =3D timer_new_ms(QEMU_CLOCK_VIRTUAL, qemu_input_queue_pr= ocess, &kbd_queue); } - qemu_input_queue_delay(&kbd_queue, kbd_timer, - delay_ms ? delay_ms : kbd_default_delay_ms); + if (queue_count < queue_limit) { + qemu_input_queue_delay(&kbd_queue, kbd_timer, + delay_ms ? delay_ms : kbd_default_delay_ms); + } } =20 InputEvent *qemu_input_event_new_btn(InputButton btn, bool down) --=20 2.7.4