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SubjectRe: Issues with capability bits and meta-data in kdbus

On Wed, Apr 22, 2015 at 5:19 AM, Andy Lutomirski <> wrote:
> Where do you draw the line?

User-space draws _this_ line.

A bus creator can set the "mandatory metadata mask" of a bus. It
defines a mask all senders (!) have to use as base. The bus creator
can thus mandate a policy for its bus and force everyone who wants to
communicate via this bus to at least agree to transmit the requested
set of information. Using UIDs+GIDs+PIDs+seclabel+names as masks works
just fine.

To be clear, kdbus only transmits metadata that sender and receiver
both agreed on. Both peers have to opt-in for an item to be


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