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Date: Tue, 8 Jan 2013 10:53:21 +0400
From: Vasily Kulikov <>
Subject: Re: /dev/ptmx timing

On Tue, Jan 08, 2013 at 06:43 +0400, Dmitry V. Levin wrote:
> On Mon, Jan 07, 2013 at 08:11:11PM -0500, adam swanda wrote:
> > Don't you need to be running as root for this to be possible?
> You certainly haven't followed the link listed below, have you?
> The elegance of this timing attack is that all you need is
> inotify_add_watch(fd, "/dev/ptmx", IN_MODIFY)
> which is usually available to everybody who has read access to /dev/ptmx.

FWIW, more harmless ways to (ab)use inotify were posted to ossec 2
years ago:


Vasily Kulikov - bringing security into open computing environments

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