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Malicious KDE theme can wipe out all your data
(www.reddit.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
This is different from the Wayland security model, as Wayland restricts the ability for clients to modify and read from other clients arbitrarily. This is an extension to a Wayland compositor, and as all extensions do, it contains code which runs on your system. Any code, unless sandboxed, can access your filesystem no matter if it's run under Wayland, X11, or no windowing system at all for that matter.
It is not related to Wayland or the compositor in any way. This is a plasmashell extension.
Similar caveats do apply to KWin scripts and effects though