On Wed, 12 Apr 2023 10:04:31 +0200, Oswald Buddenhagen wrote: > > On Wed, Apr 12, 2023 at 09:54:54AM +0200, Takashi Iwai wrote: > > I'm thinking whether we need to change anything in the kernel side for > > this at all. Can't it be changed rather in alsa-lib side instead? > > > it could, but it would be a lot uglier. user space would have to do a > "man-in-the-middle attack" on the data, while in the kernel we can > just slightly modify the consumer. this would be particularly obvious > in the case of write() access. But basically it'd be like fiddling sw_params temporarily for draining, I suppose? And the "attack" here can be taken too seriously; the whole PCM operation can be somehow interfered if a process may have the access to the PCM device, and changing sw_params itself must not introduce too much trouble. thanks, Takashi
