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@xxxxxxxxxx> > Cc: Leo Yan <leo.yan@xxxxxxxxxx> > Cc: Baolin Wang <baolin.wang@xxxxxxxxxx> > > 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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