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bug#30160: cat buffer overflow?

From: Rdrpenguin Minecraft and More
Subject: bug#30160: cat buffer overflow?
Date: Thu, 18 Jan 2018 06:31:05 -0600

If 'cat' is run with a big enough file, say /dev/sda, the terminal gets
corrupted. This corruption may also extend beyond the terminal.

Steps to reproduce:
1. Run '/bin/cat /dev/sda'.
2. Wait from 2 to 3 minutes.
3. Ctrl-C to exit.
4. Observe corrupted terminal

This was tested on gnome-terminal in Ubuntu 16.04. It may or may not happen
in other terminals / flavors, and it may produce different errors too.

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