Wayland content-protection extension

[Pekka Paalanen]

On Mon, 18 Jun 2018 13:38:09 +0530
Ramalingam C <ramalingam.c at intel.com> wrote:

> On Monday 18 June 2018 01:34 PM, Pekka Paalanen wrote:
> > On Sat, 16 Jun 2018 12:50:52 +0530
> > Ramalingam C <ramalingam.c at intel.com> wrote:
> >  

> > How does the kernel signal to userspace that the HDCP status has
> > changed? Do you piggyback on the hotplug event?
> >
> > Anything that would require userspace to repeatedly re-read properties
> > without any events triggering it is bad design. If nothing is
> > happening, the compositor needs to be able to stay asleep.  
> Pekka,
> 
> We proposed a uevent from kernel for indicating the HDCP status change.
> But that didn't fly. Right now the merged interface expects compositor 
> to poll
> the property state for the runtime failures.

Ugh. :-(

> > The SRM table smells very much like compositor configuration,
> > especially because a) it is global state: you cannot program two
> > different tables to the same connector, and b) the compositor is
> > required to save it and use it later for all clients(?). One can also
> > envision a security issue, if a system allows third party apps: an app
> > could install a fake SRM table with a fake date.  
> Compositor is expected to store the latest SRM in the non-volatile and 
> update with only newest versions.
> And it will supply the latest version to kernel(irrespective of what 
> version is provided by app). This caching is not per connector.
> SRM table itself provides the version of it. and The validity of an SRM 
> is established by verifying the integrity of its
> signature with the Digital Content Protection LLC public key, which is 
> specified by the Digital
> Content Protection LLC. So no fake SRM will be accepted.

Right, so I would propose to make that completely separate.


Thanks,
pq
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