* core: fix security and concurrency issues found in backend audit
Security:
- privesc: pipe the sudo password via stdin (sudo -S) instead of
embedding it in the command string, so it no longer appears in argv
(readable by any local user via /proc/<pid>/cmdline or ps)
- greeter: tokenize a session .desktop Exec= line into argv and execve
directly instead of running it through /bin/sh -c, closing a command-
injection path via user-writable ~/.local/share/wayland-sessions
- plugins: reject path-separator/.. in plugin id/name before joining
into a filesystem path, closing an arbitrary-directory-delete in the
uninstall/update fallback
- keybinds/hyprland: always quote unrecognized bind actions/keys when
writing generated Lua; only re-emit genuine round-tripped custom Lua
verbatim (tracked via an explicit flag), closing a Lua-injection path
- desktop/mimeapps: reject newline/bracket in mime/desktop-id fields so
they can't inject fake sections into the shared mimeapps.list
Robustness / concurrency:
- server: recover panics in the request-dispatch path so one bad
handler can't crash the daemon and drop every client
- go-wayland: recover panics in the shared dispatch choke point so a
malformed compositor event can't crash CLI tools / the daemon
- server: per-connection D-Bus client ID instead of a shared constant,
fixing cross-client signal delivery and subscription teardown
- network: guard the NetworkManager device maps with a mutex (a
concurrent map read/write here is an unrecoverable fatal error)
- cups: close the event channel on Stop() so Unsubscribe() of the last
subscriber no longer deadlocks; allocate the fresh channel in Start()
- freedesktop: reuse the shared session conn for the settings watcher
and tear it down in Close(), fixing a per-Manager conn+goroutine leak
- clipboard: mutex-guard lazy dbusConn creation
- geolocation: use WithMatchMember for the GeoClue2 LocationUpdated
signal (was WithMatchSender with an interface.member string, so the
match never fired and live location updates never arrived)
- screenshot: set failed=true on buffer/pool creation errors so the
dispatch loop doesn't wait forever for a ready/failed that never comes
* apply code review comments
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Co-authored-by: bbedward <bbedward@gmail.com>
bbedward