From patchwork Mon Oct 17 14:46:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 13008908 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3926CC433FE for ; Mon, 17 Oct 2022 14:46:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230420AbiJQOqh (ORCPT ); Mon, 17 Oct 2022 10:46:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229848AbiJQOqf (ORCPT ); Mon, 17 Oct 2022 10:46:35 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3443D67143; Mon, 17 Oct 2022 07:46:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BD9476118E; Mon, 17 Oct 2022 14:46:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A9AFC433D6; Mon, 17 Oct 2022 14:46:31 +0000 (UTC) From: Hans Verkuil To: linux-media@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Hans Verkuil Subject: [PATCH for 6.1 1/4] vivid: s_fbuf: add more sanity checks Date: Mon, 17 Oct 2022 16:46:25 +0200 Message-Id: <20221017144628.489271-2-hverkuil-cisco@xs4all.nl> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221017144628.489271-1-hverkuil-cisco@xs4all.nl> References: <20221017144628.489271-1-hverkuil-cisco@xs4all.nl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org VIDIOC_S_FBUF is by definition a scary ioctl, which is why only root can use it. But at least check if the framebuffer parameters match that of one of the framebuffer created by vivid, and reject anything else. Signed-off-by: Hans Verkuil Fixes: ef834f7836ec ([media] vivid: add the video capture and output parts) --- drivers/media/test-drivers/vivid/vivid-core.c | 22 +++++++++++++++++++ drivers/media/test-drivers/vivid/vivid-core.h | 2 ++ .../media/test-drivers/vivid/vivid-vid-cap.c | 9 +++++++- 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c index 04b75666bad4..61d48fbc3d15 100644 --- a/drivers/media/test-drivers/vivid/vivid-core.c +++ b/drivers/media/test-drivers/vivid/vivid-core.c @@ -339,6 +339,28 @@ static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *a return vivid_vid_out_g_fbuf(file, fh, a); } +/* + * Only support the framebuffer of one of the vivid instances. + * Anything else is rejected. + */ +bool vivid_validate_fb(const struct v4l2_framebuffer *a) +{ + struct vivid_dev *dev; + int i; + + for (i = 0; i < n_devs; i++) { + dev = vivid_devs[i]; + if (!dev || !dev->video_pbase) + continue; + if ((unsigned long)a->base == dev->video_pbase && + a->fmt.width <= dev->display_width && + a->fmt.height <= dev->display_height && + a->fmt.bytesperline <= dev->display_byte_stride) + return true; + } + return false; +} + static int vidioc_s_fbuf(struct file *file, void *fh, const struct v4l2_framebuffer *a) { struct video_device *vdev = video_devdata(file); diff --git a/drivers/media/test-drivers/vivid/vivid-core.h b/drivers/media/test-drivers/vivid/vivid-core.h index bfcfb3515901..473f3598db5a 100644 --- a/drivers/media/test-drivers/vivid/vivid-core.h +++ b/drivers/media/test-drivers/vivid/vivid-core.h @@ -613,4 +613,6 @@ static inline bool vivid_is_hdmi_out(const struct vivid_dev *dev) return dev->output_type[dev->output] == HDMI; } +bool vivid_validate_fb(const struct v4l2_framebuffer *a); + #endif diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c b/drivers/media/test-drivers/vivid/vivid-vid-cap.c index 86b158eeb2d8..e3e78b5bd227 100644 --- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c +++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c @@ -1276,7 +1276,14 @@ int vivid_vid_cap_s_fbuf(struct file *file, void *fh, return -EINVAL; if (a->fmt.bytesperline < (a->fmt.width * fmt->bit_depth[0]) / 8) return -EINVAL; - if (a->fmt.height * a->fmt.bytesperline < a->fmt.sizeimage) + if (a->fmt.bytesperline > a->fmt.sizeimage / a->fmt.height) + return -EINVAL; + + /* + * Only support the framebuffer of one of the vivid instances. + * Anything else is rejected. + */ + if (!vivid_validate_fb(a)) return -EINVAL; dev->fb_vbase_cap = phys_to_virt((unsigned long)a->base);