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Date: Mon, 21 Sep 2015 21:02:27 +0200
From: Florian Weimer <>
Subject: Re: s/party/hack like it's 1999

* Greg KH:

> On Mon, Sep 21, 2015 at 04:43:46PM +0000, David Holland wrote:
>> I have been arguing for years (but without success) that vt bomb
>> injection needs to be blocked in the tty driver. This problem
>> (corruption of concurrent UTF-8 streams) needs to be too, as a matter
>> of correctness and not even security.
> How exactly would a tty driver "block" anything like this?

Avoiding in-band signaling in the first place. :-/

> A tty driver never looks at the data stream in the kernel, as that
> way lies madness...

Surely there is a way to prevent two writes from interleaving?  For
writes to files in O_APPEND mode, this already happens, doesn't it?

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