From nobody Fri May 3 07:00:33 2024 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.zoho.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 1493369040676860.6871730747446; Fri, 28 Apr 2017 01:44:00 -0700 (PDT) Received: from localhost ([::1]:35810 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d41VP-00079J-8l for importer@patchew.org; Fri, 28 Apr 2017 04:43:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41081) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d41Uc-0006r7-8J for qemu-devel@nongnu.org; Fri, 28 Apr 2017 04:43:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d41UX-0004e7-Ln for qemu-devel@nongnu.org; Fri, 28 Apr 2017 04:43:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50594) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d41UX-0004YB-Cu for qemu-devel@nongnu.org; Fri, 28 Apr 2017 04:43:05 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2169CC04F4A1; Fri, 28 Apr 2017 08:43:04 +0000 (UTC) Received: from nilsson.home.kraxel.org (ovpn-116-32.ams2.redhat.com [10.36.116.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id 379799AE62; Fri, 28 Apr 2017 08:43:01 +0000 (UTC) Received: by nilsson.home.kraxel.org (Postfix, from userid 500) id 33EEF80E55; Fri, 28 Apr 2017 10:43:00 +0200 (CEST) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 2169CC04F4A1 Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=kraxel@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 2169CC04F4A1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Fri, 28 Apr 2017 10:42:37 +0200 Message-Id: <20170428084237.23960-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 28 Apr 2017 08:43:04 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] 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: Huawei PSIRT , Gerd Hoffmann , P J P 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" 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. Cc: P J P Cc: Huawei PSIRT Reported-by: jiangxin1@huawei.com Signed-off-by: Gerd Hoffmann --- ui/input.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/ui/input.c b/ui/input.c index ed88cda6d6..fb1f404095 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 2.9.3