From: Edgar Toernig <froese@gmx.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
akpm@osdl.org, viro@zeniv.linux.org.uk, tytso@mit.edu,
tigran@veritas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2
Date: Wed, 9 Aug 2006 20:00:19 +0200 [thread overview]
Message-ID: <20060809200019.0bd5eecd.froese@gmx.de> (raw)
In-Reply-To: <1155120128.5729.143.camel@localhost.localdomain>
Alan Cox wrote:
>
> Ar Mer, 2006-08-09 am 10:41 +0200, ysgrifennodd Edgar Toernig:
> > > If I own the file I can make it a symlink to a pty/tty pair
> > > I can revoke a pty/tty pair
> >
> > With the EIO/EOF behaviour that's not a problem - apps that deal
> > with ttys have to expect that condition.
>
> Think about it a moment - I can symlink any file to a tty/pty pair so
> any file I own you open might be a tty.
Yes, OK. The EIO/EOF behaviour is fine. Even for regular files it's
not something extraordinary.
> > Hmm... which apps have an open fd on block devices? Usually a
>
> cdrecord, cd audio players, eject, ....
And killing them is not OK? "fuser -km /dev/cdrom" already covers both
cases, mounted somewhere and opened for special access.
Sorry if I sound a little bit anal. IMO, a generic revoke is a pretty
sharp sword which is given to ordinary users and I have a very uneasy
feeling. They can dig in the innards of other people's processes - a
clean headshot by root is something different ...
Ciao, ET.
next prev parent reply other threads:[~2006-08-09 18:00 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-27 14:25 [RFC/PATCH] revoke/frevoke system calls V2 Pekka J Enberg
2006-07-27 15:07 ` Alan Cox
2006-07-27 15:33 ` Pekka Enberg
2006-07-27 16:09 ` Alan Cox
2006-07-27 16:01 ` Pekka J Enberg
2006-07-27 16:30 ` Alan Cox
2006-07-27 17:07 ` Pekka J Enberg
2006-07-27 18:27 ` Pekka Enberg
2006-07-27 16:41 ` Ulrich Drepper
2006-07-27 17:05 ` Pekka J Enberg
2006-07-27 17:13 ` Ulrich Drepper
2006-07-27 17:33 ` H. Peter Anvin
2006-07-27 17:44 ` Ulrich Drepper
2006-07-27 18:00 ` H. Peter Anvin
2006-07-27 17:33 ` Alan Cox
2006-07-27 17:33 ` O_CAREFUL flag to disable open() side effects H. Peter Anvin
2006-07-27 17:43 ` Russell King
2006-07-27 17:50 ` Ulrich Drepper
2006-07-27 18:05 ` Alan Cox
2006-07-27 18:03 ` H. Peter Anvin
2006-07-27 18:14 ` Joshua Hudson
2006-08-05 21:05 ` [RFC/PATCH] revoke/frevoke system calls V2 Pavel Machek
2006-07-27 18:06 ` Petr Baudis
2006-07-27 18:10 ` Pekka Enberg
2006-07-27 19:30 ` Horst H. von Brand
2006-07-28 3:40 ` Pekka J Enberg
2006-07-27 18:34 ` Alan Cox
2006-08-05 12:29 ` Pavel Machek
2006-08-07 5:42 ` Pekka J Enberg
2006-08-07 8:17 ` Edgar Toernig
2006-08-07 9:51 ` Pekka Enberg
2006-08-07 20:41 ` Edgar Toernig
2006-08-07 22:24 ` Chase Venters
2006-08-08 12:15 ` Alan Cox
2006-08-09 8:41 ` Edgar Toernig
2006-08-09 10:39 ` Alan Cox
2006-08-09 18:00 ` Edgar Toernig
2006-08-09 18:36 ` Alan Cox
2006-08-09 19:13 ` Pekka Enberg
2006-08-09 20:08 ` Edgar Toernig
2006-08-09 21:29 ` Edgar Toernig
2006-08-11 7:52 ` Helge Hafting
2006-08-07 22:52 ` David Wagner
2006-08-07 22:56 ` Daniel Jacobowitz
2006-08-07 23:12 ` Chase Venters
2006-08-08 12:16 ` Pekka Enberg
2006-08-08 16:02 ` Kari Hurtta
2006-08-08 21:54 ` Theodore Tso
2006-08-09 6:32 ` Pekka Enberg
2006-08-08 12:13 ` Alan Cox
2006-08-08 12:29 ` Alan Cox
2006-08-08 12:31 ` Pekka Enberg
2006-08-08 12:57 ` Pavel Machek
2006-08-08 14:14 ` Alan Cox
2006-08-08 13:57 ` Pavel Machek
2006-08-09 8:41 ` Edgar Toernig
2006-08-09 10:42 ` Alan Cox
2006-08-09 18:00 ` Edgar Toernig [this message]
2006-08-09 18:35 ` Alan Cox
2006-08-09 19:14 ` Pekka Enberg
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