That reminded me of the Linux GRUB2 bug where you could press Backspace key 28 times and bypass all security. [1]

>The source of the vulnerability is nothing but an integer underflow fault that was introduced with single commit in Grub version 1.98 (December 2009) – b391bdb2f2c5ccf29da66cecdbfb7566656a704d – affecting the grub_password_get() function.

[1] https://thehackernews.com/2015/12/hack-linux-grub-password.h...