dbus 1.12.24 (UNRELEASED)
=========================
+Behaviour changes:
+
+• On Linux, dbus-daemon and other uses of DBusServer now create a
+ path-based Unix socket, unix:path=..., when asked to listen on a
+ unix:tmpdir=... address. This makes unix:tmpdir=... equivalent to
+ unix:dir=... on all platforms.
+ Previous versions would have created an abstract socket, unix:abstract=...,
+ in this situation.
+ This change primarily affects the well-known session bus when run via
+ dbus-launch(1) or dbus-run-session(1). The user bus, enabled by configuring
+ dbus with --enable-user-session and running it on a systemd system,
+ already used path-based Unix sockets and is unaffected by this change.
+ This behaviour change prevents a sandbox escape via the session bus socket
+ in sandboxing frameworks that can share the network namespace with the host
+ system, such as Flatpak.
+ This change might cause a regression in situations where the abstract socket
+ is intentionally shared between the host system and a chroot or container,
+ such as some use-cases of schroot(1). That regression can be resolved by
+ using a bind-mount to share either the D-Bus socket, or the whole /tmp
+ directory, with the chroot or container.
+ (dbus#416, Simon McVittie)
+
Fixes:
• Don't crash if dbus-daemon is asked to watch more than 128 directories