From patchwork Mon Feb 4 11:28:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaroslav Kysela X-Patchwork-Id: 10795449 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 DD822922 for ; Mon, 4 Feb 2019 11:36:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CB32B2B092 for ; Mon, 4 Feb 2019 11:36:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BE5362B0AC; Mon, 4 Feb 2019 11:36:21 +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 9D5542AB7B for ; Mon, 4 Feb 2019 11:36:20 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id ABD9D2674D5; Mon, 4 Feb 2019 12:28:51 +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 757862674DD; Mon, 4 Feb 2019 12:28:49 +0100 (CET) Received: from mail1.perex.cz (mail1.perex.cz [77.48.224.245]) by alsa0.perex.cz (Postfix) with ESMTP id 9C95E2674C0 for ; Mon, 4 Feb 2019 12:28:47 +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 6EB05A0046; Mon, 4 Feb 2019 12:28:47 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.perex.cz 6EB05A0046 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=perex.cz; s=default; t=1549279727; bh=7HXVVhO01C8yvaZYTb4gx7JXcWdTClqE5of/JNRRAcI=; h=From:To:Cc:Subject:Date:From; b=j6pv+YawCpnAJqxS+0xPICicJLC5bQPK8FIp8eEx3qbfyJLVAovkQO8FHBbwddYZd Zj95ypGfS0oBrLzhvk6Gp1pQRpS9CGs6epDXWLEzrYo2KMaRt6lNLRCYPzienYgfJX njkosgpOUt+OFzfUoxSnPefvr8Cb56kJ4/YLAkmY= 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 12:28:39 +0100 (CET) From: Jaroslav Kysela To: ALSA development Date: Mon, 4 Feb 2019 12:28:31 +0100 Message-Id: <20190204112834.27083-1-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 0/3 v5] 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 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 v4 of the patches: - more simple restriction control (only two modes - full/buffer) - the tinyalsa implementation follows this change v5 of the patches: - merge pcm_..._mmap_allowed fcns to the snd_pcm_mmap_... fcns Cc: Phil Burk Cc: Zach Riggle Cc: Mark Brown Cc: Leo Yan Cc: Baolin Wang Jaroslav Kysela (3): ALSA: pcm: implement the anonymous dup (inode file descriptor) ALSA: pcm: merge pcm_..._mmap_allowed fcns to the snd_pcm_mmap_... fcns 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 | 151 ++++++++++++++++++++++++++++++++------------ 6 files changed, 130 insertions(+), 53 deletions(-)