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

[Jaroslav Kysela <perex@perex.cz>]

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.

Cc: Mark Brown <broonie@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Baolin Wang <baolin.wang@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