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).
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