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Date: Sat, 18 Mar 2023 13:33:01 +0000
From: Eric Ashley <>
Subject: Re: TTY pushback vulnerabilities / TIOCSTI

According to a note from kernel maintenance (, as of 2008 only Heirloom mailx (a.k.a. nail) used it for ~h interactive header editing.

Best regards,


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------- Original Message -------
On Friday, March 17th, 2023 at 7:13 PM, Lyndon Nerenberg (VE7TFX/VE6BBM) <> wrote:

> Does anyone even remember why TIOCSTI was added in the
> first place? I remember stumbling across it decades
> ago (SVR?), but I've ever seen a use case for it.
> It puzzled me back then why it even existed.

> --lyndon
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