From patchwork Wed Jan 30 12:41:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 10788507 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 4190B91E for ; Wed, 30 Jan 2019 12:42:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2E7272EA9A for ; Wed, 30 Jan 2019 12:42:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2C8F82EB92; Wed, 30 Jan 2019 12:42:01 +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 3DA232EA9A for ; Wed, 30 Jan 2019 12:42:00 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 952522674AC; Wed, 30 Jan 2019 13:41:58 +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 BE4692678CA; Wed, 30 Jan 2019 13:41:55 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) by alsa0.perex.cz (Postfix) with ESMTP id 6E44626745C for ; Wed, 30 Jan 2019 13:41:53 +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 47E28A003F; Wed, 30 Jan 2019 13:41:53 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz 47E28A003F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1548852113; bh=aqYxK7j3hyllhHe8k/FIx/C4gSHZxx1gP08tO+2STO4=; h=From:To:Cc:Subject:Date:From; b=34uuJ2hVeEqLEH1acQXwNVu3phXHA67802Bk1LO/VrfGaXnmxG17l2KMawQSXFzXg hgAgktq+qADqL8q0Z8Ex2B3eOzOfULQBrOgNY/JVYG6PDj1IcBYqcWHHywnXaFrls3 MWobAt9/RGO27S7e8cb6a5X/RRW7Zf8lN8kQf+0Q= 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 13:41:46 +0100 (CET) From: Jaroslav Kysela To: ALSA development Date: Wed, 30 Jan 2019 13:41:37 +0100 Message-Id: <20190130124139.10439-1-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 v3 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) v3 of the patches: - group integer declarations in snd_pcm_anonymous_dup() - replaced substream->pcm with pcm in snd_pcm_anonymous_dup() - added SNDRV_PCM_PERM_RW check for read/write/readv/writev syscalls 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 | 158 ++++++++++++++++++++++++++++++++++++++++++-- 6 files changed, 176 insertions(+), 19 deletions(-)