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Date: Tue, 14 Mar 2023 11:36:26 +0100
From: Jakub Wilk <>
To: <>
Subject: Re: TTY pushback vulnerabilities / TIOCSTI

* Hanno Böck <>, 2023-03-14 09:51:
>In the 2017 post solar designer mentioned that the Linux kernel 
>developers have multiple times rejected changes in the kernel.

I believe this is the post in question:

>Starting with Kernel 6.2 it is possible to disable TIOCSTI (unset 

Nice, but...

On Linux virtual terminals, it's possible to achieve pretty much the 
same effect using TIOCLINUX, the ioctl used by gpm to implement 

I've attached a minimal PoC. A more elaborate one is here:

Jakub Wilk

View attachment "minittyjack.c" of type "text/x-csrc" (584 bytes)

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