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Message-ID: <20230314103626.3ucbt2rjdfhjbe6t@jwilk.net>
Date: Tue, 14 Mar 2023 11:36:26 +0100
From: Jakub Wilk <jwilk@...lk.net>
To: <oss-security@...ts.openwall.com>
Subject: Re: TTY pushback vulnerabilities / TIOCSTI
* Hanno Böck <hanno@...eck.de>, 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:
https://www.openwall.com/lists/oss-security/2017/06/03/9
>Starting with Kernel 6.2 it is possible to disable TIOCSTI (unset
>CONFIG_LEGACY_TIOCSTI).
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
copy&pasting.
I've attached a minimal PoC. A more elaborate one is here:
https://github.com/jwilk/ttyjack
--
Jakub Wilk
View attachment "minittyjack.c" of type "text/x-csrc" (584 bytes)
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