From patchwork Mon Feb 4 09:39:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 10795295 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 59C9A6C2 for ; Mon, 4 Feb 2019 09:39:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 465A22B034 for ; Mon, 4 Feb 2019 09:39:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3A0AC2B038; Mon, 4 Feb 2019 09:39:49 +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 8AB872B034 for ; Mon, 4 Feb 2019 09:39:48 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id C98062674DE; Mon, 4 Feb 2019 10:39:46 +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 5F6F12674E8; Mon, 4 Feb 2019 10:39:44 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) by alsa0.perex.cz (Postfix) with ESMTP id 3CBD32674D6 for ; Mon, 4 Feb 2019 10:39:42 +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 00E20A003F; Mon, 4 Feb 2019 10:39:41 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz 00E20A003F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1549273182; bh=yzs2X96oeeYz88d253O4k4bzoQRZhSz1eUwvrt1Hfso=; h=From:To:Cc:Subject:Date:From; b=wxruCsMUM9JNyucQ74x5oknqlyf5v56w/TKfBObnJGZdiVIQnI6a4stifhZ1+hGZe STo5RKQrkN/FFo/xs8uEt8eNZCQQDj5rImAljs0wnUSMYLygQieMLcj1KTti8osWAA HUFuh6odQvralRoZSzsdJEvvXgT1WHwpFawUI9qk= 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; Mon, 4 Feb 2019 10:39:33 +0100 (CET) From: Jaroslav Kysela To: ALSA development Date: Mon, 4 Feb 2019 10:39:08 +0100 Message-Id: <20190204093910.23878-1-perex@perex.cz> X-Mailer: git-send-email 2.13.6 Cc: Baolin Wang , Takashi Iwai , Phil Burk , Zach Riggle , Mark Brown , Leo Yan Subject: [alsa-devel] [PATCH 0/2 v4] ALSA: pcm: anonymous dup implementation 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 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 v4 of the patches: - more simple restriction control (only two modes - full/buffer) - the tinyalsa implementation follows this change Cc: Phil Burk Cc: Zach Riggle 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 mmap buffer mode for the anonymous dup include/sound/pcm.h | 10 +++-- include/uapi/sound/asound.h | 6 ++- sound/core/oss/pcm_oss.c | 2 +- sound/core/pcm.c | 13 +++--- sound/core/pcm_compat.c | 1 + sound/core/pcm_native.c | 97 ++++++++++++++++++++++++++++++++++++++++++--- 6 files changed, 110 insertions(+), 19 deletions(-) Signed-off-by: Jaroslav Kysela Reviewed-by: Takashi Iwai