From patchwork Fri Apr 8 04:52:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 1614710 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=HWcUO5mX; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) 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 bilbo.ozlabs.org (Postfix) with ESMTPS id 4KZQrH6k8Lz9sGk for ; Fri, 8 Apr 2022 14:53:51 +1000 (AEST) Received: from localhost ([::1]:49934 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ncgd2-0004a5-Q9 for incoming@patchwork.ozlabs.org; Fri, 08 Apr 2022 00:53:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49836) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ncgcF-0004YK-5z for qemu-devel@nongnu.org; Fri, 08 Apr 2022 00:52:59 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:35668) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ncgcD-0000vL-1h for qemu-devel@nongnu.org; Fri, 08 Apr 2022 00:52:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649393576; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+9DcIpcWwr2lRr5tD7gpX78GxBXEZ7BwAFMi4YFIHrQ=; b=HWcUO5mXXsDs4cSdVekgUbOZEG0o0h0LojtYNfQyzWHNhqqQ82Z1qF7UkBNig8Uk89h0fV vU7eS2XwFXGu4vlIQEadgGJsVlBlUYwHMFCWGfQp9I5hmJ9+Need/7z8ncsH62HfmlQAyM 7sp9mvlU2cGIbLWI3xWSxE6MWFngL0U= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-367-NTYfp8z7Mi6jQkIgT2kLWQ-1; Fri, 08 Apr 2022 00:52:54 -0400 X-MC-Unique: NTYfp8z7Mi6jQkIgT2kLWQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 89EA0800B28 for ; Fri, 8 Apr 2022 04:52:54 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.192.9]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 54BBE40CF8EA; Fri, 8 Apr 2022 04:52:54 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id BD3F91800623; Fri, 8 Apr 2022 06:52:52 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 1/2] display/qxl-render: fix race condition in qxl_cursor (CVE-2021-4207) Date: Fri, 8 Apr 2022 06:52:51 +0200 Message-Id: <20220408045252.2375896-2-kraxel@redhat.com> In-Reply-To: <20220408045252.2375896-1-kraxel@redhat.com> References: <20220408045252.2375896-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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: , Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Mauro Matteo Cascella , Gerd Hoffmann Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Mauro Matteo Cascella Avoid fetching 'width' and 'height' a second time to prevent possible race condition. Refer to security advisory https://starlabs.sg/advisories/22-4207/ for more information. Fixes: CVE-2021-4207 Signed-off-by: Mauro Matteo Cascella Reviewed-by: Marc-André Lureau Message-Id: <20220407081106.343235-1-mcascell@redhat.com> Signed-off-by: Gerd Hoffmann --- hw/display/qxl-render.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c index d28849b12176..237ed293baae 100644 --- a/hw/display/qxl-render.c +++ b/hw/display/qxl-render.c @@ -266,7 +266,7 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor, } break; case SPICE_CURSOR_TYPE_ALPHA: - size = sizeof(uint32_t) * cursor->header.width * cursor->header.height; + size = sizeof(uint32_t) * c->width * c->height; qxl_unpack_chunks(c->data, size, qxl, &cursor->chunk, group_id); if (qxl->debug > 2) { cursor_print_ascii_art(c, "qxl/alpha");