在 Hacker News Daily 上看到「Screensaver lock by-pass via the virtual keyboard」這篇，裡面這邊題到了 screensaver lock 的有趣話題。
先講嚴肅一點的，這個 bug 被編號為 CVE-2020-25712，問題出在 xorg-x11-server 上：
A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
比較有趣的事情是，這個 bug 是小朋友在亂玩時拉出 virtual keyboard 觸發的：
A few weeks ago, my kids wanted to hack my linux desktop, so they typed and clicked everywhere, while I was standing behind them looking at them play... when the screensaver core dumped and they actually hacked their way in! wow, those little hackers...
然後他說他自己搞不出來：
I tried to recreate the crash on my own with no success, maybe because it required more than 4 little hands typing and using the mouse on the virtual keyboard.
另外一個人也說他家小朋友也弄出 segfault 了：
My kids came upon a similar cinnamon-screensaver segfault! I've emailed details of how to reproduce the problem to root@linuxmint.com.
小朋友超強 XDDD