Context creation in DRM is marked as needing root access. Is this to prevent a process from doing a DOS attack by creating too many contexts? Couldn't I do the same DOS attack simply by creating lots of processes each with their own context?
Is there a hardware limit on contexts? It looks to me like contexts are allocated in normal memory and then swapped in as needed. But I don't understand everything going on with context creation yet.
You're not alone. I think the thinking relates to hardware schemes where contexts are hardware resources - these aren't uncommon at all, but we don't tend to make use of that facility in the existing drivers.
Additionally, by making this step root-only, the X server is effectively required to perform this task, meaning that the client must be 'blessed' by the X server's security mechanisms, whatever they might be.
Keith
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