Re: [alsa-devel] [RFC PATCH] ALSA: core: Add DMA share buffer support

[Mark Brown]

On Fri, Jan 25, 2019 at 02:19:22PM +0100, Takashi Iwai wrote:
> Leo Yan wrote:

> > If we directly use the device node /dev/snd/ as file descriptor, even
> > though we specify flag O_EXCL when open it, but it still is not an
> > anon inode file descriptor.  Thus this is not safe enough and will be
> > blocked by SELinux.  On the other hand, this patch wants to use
> > dma-buf framework to provide file descriptor for the audio buffer, and
> > this audio buffer can be one of mutiple audio buffers in the system
> > and it can be shared to any audio client program.

> Hrm, it sounds like a workaround just to bypass SELinux check...

> The sound server can open another PCM stream with O_APPEND, and pass
> that fd to the client, too?

So long as we can teach SELinux that they're safe to export, yeah.

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