[alsa-devel] [PATCH 0/3] ALSA: pcm: implement the anonymous dup

[Mark Brown]

On Tue, Jan 29, 2019 at 06:59:06PM +0100, Jaroslav Kysela wrote:
> 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.

Thanks for looking at this!  Copying in Phil who is probably best placed
to review these from an Android perspective.

> Cc: Mark Brown <broonie at kernel.org>
> Cc: Leo Yan <leo.yan at linaro.org>
> Cc: Baolin Wang <baolin.wang at linaro.org>
> 
> Jaroslav Kysela (3):
>   ALSA: pcm: implement the anonymous dup (inode file descriptor)
>   ALSA: pcm: remove the file member from struct pcm
>   ALSA: pcm: implement the ioctl/mmap filter for the anonymous dup
> 
>  include/sound/pcm.h         |  10 +--
>  include/uapi/sound/asound.h |  12 +++-
>  sound/core/oss/pcm_oss.c    |   3 +-
>  sound/core/pcm.c            |  48 +++++++++-----
>  sound/core/pcm_compat.c     |   1 +
>  sound/core/pcm_native.c     | 154 +++++++++++++++++++++++++++++++++++++++++---
>  6 files changed, 195 insertions(+), 33 deletions(-)
> 
> -- 
> 2.13.6
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