On Fri, Jan 18, 2019 at 08:39:32PM +0100, Takashi Iwai wrote:
Mark Brown wrote:
multiple tasks). I would probably go in this way and add more extended permission control for the PCM device, so permissions can be restricted for the passed descriptor to the producer or the consumer task. In this
One concern I have with doing some ALSA-specific custom permissions thing is integration with frameworks like SELinux (they'd presumably need to learn about the ALSA specific stuff to manage it). It also
Well, I wonder what makes it more difficult by the approach Jaroslav suggested. With O_APPEND, you can just call mmap() normally, and that's all. What's the merit of dma-buf approach wrt the security?
It was the bit about adding more extended permission control that I was worried about there, not the initial O_APPEND bit. Indeed the O_APPEND bit sounds like it might also work from the base buffer sharing point of view, I have to confess I'd not heard of that feature before (it didn't come up in the discussion when Eric raised this in Prague).