From patchwork Fri Jun 5 16:25:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 11590009 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 65E8C1391 for ; Fri, 5 Jun 2020 16:27:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 476092077D for ; Fri, 5 Jun 2020 16:27:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="VzDo2HDe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728419AbgFEQ1P (ORCPT ); Fri, 5 Jun 2020 12:27:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728151AbgFEQ0k (ORCPT ); Fri, 5 Jun 2020 12:26:40 -0400 Received: from mail-pl1-x643.google.com (mail-pl1-x643.google.com [IPv6:2607:f8b0:4864:20::643]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18E1CC08C5C2; Fri, 5 Jun 2020 09:26:39 -0700 (PDT) Received: by mail-pl1-x643.google.com with SMTP id n2so3809348pld.13; Fri, 05 Jun 2020 09:26:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=iDQgGfOy6ldHVs5uNpQriET3jeGe/mkeG7jR7Di4Pt0=; b=VzDo2HDeTObGijOzuxOPMg2bjqmZZHU21My3x8RUKhb8LRKOqa4cYT5z4vQMmOqVgs CQWtDQVlQMuzSW8M7UmwIRlvWlaGtNEOrZ5dFqs8zJoOWJlwE8D1t1+ZgvfYgAGL1TZ5 FzUpfPXioDq7Dp14jk8z/2VXfla6v0gidfuo2Y6PfQb16qqhaRqiQQIH0Zoa5lZSNs1P 9teXl722s/9Szt31jLk2yyk6AYLcCtr4MZF7gSejeQxacqpgIdMrswNfGx9Mzpis80Be IEb+5A+vKCIB6I9i6D6mrEh/2+011oiYHN8gcczWWjUXznf3Hw5ip3bPQkff2rJWjCpP 3jfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=iDQgGfOy6ldHVs5uNpQriET3jeGe/mkeG7jR7Di4Pt0=; b=ju/VmNbR+V9LQ4tIqCyT1fWpem22PFnpZU5x1GgxTFCnSZ4OZChsFATJ+ETCYVwPg2 Lg/b+477I2LNxo8yLNXhm0OvYv67OUhKUvm3fVf3EdlO1Y7l0KHCQVSVmvtPRd+1mkBd EYItghHuu+638fAr9mJAO8afGnWP/DJcONEmeE3Ae21NJRPj9M3ucyFuh2I1Q/e3TzHJ kKMEmE5EosY9G6vD0hbOurprlJUl/MMiix1fk/+Cd4t3XEjswaFQXFSxt0dBWaoD+rh6 7IPvfLNwPibqFfq3t0kgtQc9KdpQ/iCL/qRx7mcfzfiztziWNWhimeU+jH9GKV8rR6gm bjZA== X-Gm-Message-State: AOAM533L/a5k6Hk7d3qAUvI6S4YJmblCtzX4iixNyTDxAK5UeNZ8mzAK JKIJ0LYM3XafTaoqOQOprnrMmTIG X-Google-Smtp-Source: ABdhPJx8cO6H0Ki2knLseZ0hHVik4GtM+/9YXQPB1y8TmFAEVVYQUtjegXU7n+eUPZKDKs3c/NTsRw== X-Received: by 2002:a17:90a:fe83:: with SMTP id co3mr3873149pjb.204.1591374398219; Fri, 05 Jun 2020 09:26:38 -0700 (PDT) Received: from localhost.localdomain ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id b29sm86205pff.176.2020.06.05.09.26.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2020 09:26:37 -0700 (PDT) From: Florian Fainelli X-Google-Original-From: Florian Fainelli To: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org, Jaedon Shin , Mauro Carvalho Chehab , Florian Fainelli , Mauro Carvalho Chehab , Michael Krufky , Alexander Viro , Shuah Khan , Colin Ian King , Katsuhiro Suzuki , Satendra Singh Thakur , linux-media@vger.kernel.org (open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)), linux-fsdevel@vger.kernel.org (open list:FILESYSTEMS (VFS and infrastructure)) Subject: [PATCH stable 4.9 19/21] media: dvb_frontend: Add commands implementation for compat ioct Date: Fri, 5 Jun 2020 09:25:16 -0700 Message-Id: <20200605162518.28099-20-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200605162518.28099-1-florian.fainelli@broadcom.com> References: <20200605162518.28099-1-florian.fainelli@broadcom.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Jaedon Shin commit 18192a77f0810933ab71a46c1b260d230d7352ee upstream The dtv_properties structure and the dtv_property structure are different sizes in 32-bit and 64-bit system. This patch provides FE_SET_PROPERTY and FE_GET_PROPERTY ioctl commands implementation for 32-bit user space applications. Signed-off-by: Jaedon Shin Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Florian Fainelli --- drivers/media/dvb-core/dvb_frontend.c | 131 ++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index c0a25cd6ccb8..34f55a2ba071 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -1983,9 +1983,140 @@ static long dvb_frontend_ioctl(struct file *file, unsigned int cmd, } #ifdef CONFIG_COMPAT +struct compat_dtv_property { + __u32 cmd; + __u32 reserved[3]; + union { + __u32 data; + struct dtv_fe_stats st; + struct { + __u8 data[32]; + __u32 len; + __u32 reserved1[3]; + compat_uptr_t reserved2; + } buffer; + } u; + int result; +} __attribute__ ((packed)); + +struct compat_dtv_properties { + __u32 num; + compat_uptr_t props; +}; + +#define COMPAT_FE_SET_PROPERTY _IOW('o', 82, struct compat_dtv_properties) +#define COMPAT_FE_GET_PROPERTY _IOR('o', 83, struct compat_dtv_properties) + +static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + int i, err = 0; + + if (cmd == COMPAT_FE_SET_PROPERTY) { + struct compat_dtv_properties prop, *tvps = NULL; + struct compat_dtv_property *tvp = NULL; + + if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop))) + return -EFAULT; + + tvps = ∝ + + /* + * Put an arbitrary limit on the number of messages that can + * be sent at once + */ + if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS)) + return -EINVAL; + + tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp)); + if (IS_ERR(tvp)) + return PTR_ERR(tvp); + + for (i = 0; i < tvps->num; i++) { + err = dtv_property_process_set(fe, file, + (tvp + i)->cmd, + (tvp + i)->u.data); + if (err < 0) { + kfree(tvp); + return err; + } + } + kfree(tvp); + } else if (cmd == COMPAT_FE_GET_PROPERTY) { + struct compat_dtv_properties prop, *tvps = NULL; + struct compat_dtv_property *tvp = NULL; + struct dtv_frontend_properties getp = fe->dtv_property_cache; + + if (copy_from_user(&prop, compat_ptr(arg), sizeof(prop))) + return -EFAULT; + + tvps = ∝ + + /* + * Put an arbitrary limit on the number of messages that can + * be sent at once + */ + if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS)) + return -EINVAL; + + tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp)); + if (IS_ERR(tvp)) + return PTR_ERR(tvp); + + /* + * Let's use our own copy of property cache, in order to + * avoid mangling with DTV zigzag logic, as drivers might + * return crap, if they don't check if the data is available + * before updating the properties cache. + */ + if (fepriv->state != FESTATE_IDLE) { + err = dtv_get_frontend(fe, &getp, NULL); + if (err < 0) { + kfree(tvp); + return err; + } + } + for (i = 0; i < tvps->num; i++) { + err = dtv_property_process_get( + fe, &getp, (struct dtv_property *)tvp + i, file); + if (err < 0) { + kfree(tvp); + return err; + } + } + + if (copy_to_user((void __user *)compat_ptr(tvps->props), tvp, + tvps->num * sizeof(struct compat_dtv_property))) { + kfree(tvp); + return -EFAULT; + } + kfree(tvp); + } + + return err; +} + static long dvb_frontend_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + int err; + + if (cmd == COMPAT_FE_SET_PROPERTY || cmd == COMPAT_FE_GET_PROPERTY) { + if (down_interruptible(&fepriv->sem)) + return -ERESTARTSYS; + + err = dvb_frontend_handle_compat_ioctl(file, cmd, arg); + + up(&fepriv->sem); + return err; + } + return dvb_frontend_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); } #endif