# dbus-broker - Linux D-Bus Message Broker
## CHANGES WITH 22:
* Implement org.freedesktop.DBus.Debug.Stats in the driver. This
interface is defined by dbus-daemon and we use it similarly to expose
internal state of the broker. For now, only the GetStats() call is
supported, and it dumps the full accounting state to the caller.
This will hopefully aid resource-debugging in the future.
* Support no-op activation files. If neither a binary to execute, nor a
service to activate, is specified, the service is expected to spawn
via its own means (for instance spawned automatically during bootup,
or activated via side-channels).
* The new configuration option `linux-4-17`, if set to true (default is
false), makes dbus-broker assume it runs on linux-v4.17 or newer. It
will make use of features introduced up to linux-v4.17. This allows
to forcibly disable workarounds for old kernels, where a feature
detection at runtime is not possible.
This option is meant to allow distributions to circumvent the
workarounds, in case their setup does not work with them. Unless you
have reason to set this option, it is safe to keep the default.
Once the mandatory required kernel version of dbus-broker is bumped
to v4.17, this option will default to `true` (an override to `false`
will then no longer be allowed).
* The `BecomeMonitor()` call now allows `eavesdrop={true|false}`
attributes. This is required for compatibility with `dbus-monitor`,
which always forcibly sets this attribute. Note that the attribute
has no effect (nor meaning) when specified with `BecomeMonitor()`. It
is completely ignored by dbus-broker.
* The SELinux configuration parser is fixed regarding some wrongly
placed assertions.
* DBus socket handling is fixed to no longer fault on `MSG_CTRUNC`.
Without this, clients can DoS dbus-broker, if, and only if, they can
make the active LSM drop file-descriptors in a transmitted message
due to policy denials. This has no effect if LSMs are not used.
* Minor bugfixes all over the place, including fixes to build under
musl libc.
Contributions from: David Rheinsberg, Luca Boccassi, Tom Gundersen
- Tübingen, 2020-02-17
