From patchwork Tue Dec 19 19:29:54 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kim, Dongwon" X-Patchwork-Id: 10124149 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 037AB6019C for ; Tue, 19 Dec 2017 19:40:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E837D286C2 for ; Tue, 19 Dec 2017 19:40:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DD2B82924D; Tue, 19 Dec 2017 19:40:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DAEC7291FE for ; Tue, 19 Dec 2017 19:40:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2020D6E388; Tue, 19 Dec 2017 19:37:08 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id B91956E331 for ; Tue, 19 Dec 2017 19:36:54 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Dec 2017 11:36:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,428,1508828400"; d="scan'208";a="4018610" Received: from downor-z87x-ud5h.fm.intel.com ([10.1.122.11]) by orsmga007.jf.intel.com with ESMTP; 19 Dec 2017 11:36:54 -0800 From: Dongwon Kim To: linux-kernel@vger.kernel.org Subject: [RFC PATCH 38/60] hyper_dmabuf: preventing self exporting of dma_buf Date: Tue, 19 Dec 2017 11:29:54 -0800 Message-Id: <1513711816-2618-38-git-send-email-dongwon.kim@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1513711816-2618-1-git-send-email-dongwon.kim@intel.com> References: <1513711816-2618-1-git-send-email-dongwon.kim@intel.com> MIME-Version: 1.0 Cc: xen-devel@lists.xenproject.org, mateuszx.potrola@intel.com, dri-devel@lists.freedesktop.org, dongwon.kim@intel.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Adding ID check to make sure a dma-buf is exported externally since hyper_dmabuf only allows to export a dmabuf to a different VM. Signed-off-by: Dongwon Kim --- drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c index 12f7ce4..b77b156 100644 --- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c +++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c @@ -103,6 +103,12 @@ static int hyper_dmabuf_export_remote_ioctl(struct file *filp, void *data) export_remote_attr = (struct ioctl_hyper_dmabuf_export_remote *)data; + if (hyper_dmabuf_private.domid == export_remote_attr->remote_domain) { + dev_err(hyper_dmabuf_private.device, + "exporting to the same VM is not permitted\n"); + return -EINVAL; + } + dma_buf = dma_buf_get(export_remote_attr->dmabuf_fd); if (IS_ERR(dma_buf)) {