Date: Tue, 8 Jan 2013 10:53:21 +0400 From: Vasily Kulikov <segoon@...nwall.com> To: oss-security@...ts.openwall.com 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: http://www.openwall.com/lists/kernel-hardening/2011/07/22/1 Thanks, -- Vasily Kulikov http://www.openwall.com - bringing security into open computing environments
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