On 20/06/16 10:48, Michel Dänzer wrote:
On 18.06.2016 02:41, Frank Binns wrote:
Up until now, DRI3 was only used for devices that have render nodes, unless
overridden via an environment variable, with it falling back to DRI2 otherwise.
This limitation was there in order to support WL_bind_wayland_display as it
requires client opened device node fds to be authenticated, which isn't possible
when using DRI3. This is an unfortunate compromise as DRI3 provides security
benefits over DRI2.
What exactly is it that works with render nodes but not with
unauthenticated non-render nodes? Isn't that a kernel bug?
The problem isn't that something doesn't work with unauthenticated
non-render nodes (wouldn't that be the kernel bug?) but that if a
client opens the primary/legacy node it needs the resulting fd to
be authenticated, which isn't supported by the X11 DRI3 protocol.
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