From patchwork Wed Jan 30 08:47:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 10787895 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5653291E for ; Wed, 30 Jan 2019 08:48:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4327029FAA for ; Wed, 30 Jan 2019 08:48:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 375572E151; Wed, 30 Jan 2019 08:48:12 +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=-2.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 85AD429FAA for ; Wed, 30 Jan 2019 08:48:11 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 0582C2674B9; Wed, 30 Jan 2019 09:48:10 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id DE04F26785F; Wed, 30 Jan 2019 09:48:06 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) by alsa0.perex.cz (Postfix) with ESMTP id 2401B26749A for ; Wed, 30 Jan 2019 09:48:05 +0100 (CET) Received: from mail1.perex.cz (localhost [127.0.0.1]) by smtp1.perex.cz (Perex's E-mail Delivery System) with ESMTP id F2F33A003F; Wed, 30 Jan 2019 09:48:04 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz F2F33A003F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1548838085; bh=cmw1j/M03CUjr1EgmbhiF3UUmmj4/sgRLv4Fzey43aU=; h=From:To:Cc:Subject:Date:From; b=orJJkUyUXnqKq+qkDVwlCB+AfDXlWxYZRr4PSCUttgVFieTCRnN1PHdj+KH3x9p3L /MdU8S1l9+gT65EDaMSWPVZHWpWjGvBI7rzbQggUAtEmurSK60a69nBC7sK6GmvSHk zxTkXFEPnV0WbI2JubiMLn9D7VxMKyn7S0XxjXnA= Received: from p50.perex-int.cz (unknown [192.168.100.94]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: perex) by mail1.perex.cz (Perex's E-mail Delivery System) with ESMTPSA; Wed, 30 Jan 2019 09:47:57 +0100 (CET) From: Jaroslav Kysela To: ALSA development Date: Wed, 30 Jan 2019 09:47:31 +0100 Message-Id: <20190130084733.979-1-perex@perex.cz> X-Mailer: git-send-email 2.13.6 Cc: Baolin Wang , Takashi Iwai , Phil Burk , Mark Brown , Leo Yan Subject: [alsa-devel] [PATCH 0/2] ALSA: pcm: implement the anonymous dup v2 X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP This patchset contains the anonymous dup implementation with permissions checking for the ALSA's PCM interface in kernel to enable the restricted DMA sound buffer sharing for the restricted tasks. The code was tested through qemu and it seems to be pretty stable. The initial tinyalsa implementation can be found here: https://github.com/perexg/tinyalsa/commits/anondup The filtering might be refined. It depends on the real requirements. Perhaps, we may create more ioctl groups. Any comments are more than welcome. v2 of the patches: - change clone parameter to subdevice number for the pcm attach - change SNDRV_PCM_PERM_MAX to SNDRV_PCM_PERM_MASK - the tinyalsa implementation was a little updated (restructured) Cc: Phil Burk Cc: Mark Brown Cc: Leo Yan Cc: Baolin Wang Jaroslav Kysela (2): ALSA: pcm: implement the anonymous dup (inode file descriptor) ALSA: pcm: implement the ioctl/mmap filter for the anonymous dup include/sound/pcm.h | 9 +-- include/uapi/sound/asound.h | 12 +++- sound/core/oss/pcm_oss.c | 2 +- sound/core/pcm.c | 13 ++-- sound/core/pcm_compat.c | 1 + sound/core/pcm_native.c | 153 ++++++++++++++++++++++++++++++++++++++++++-- 6 files changed, 171 insertions(+), 19 deletions(-)