From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Eric Lammerts <eric@lammerts.org>
Cc: Marc Ballarin <Ballarin.Marc@gmx.de>, Greg KH <greg@kroah.com>,
albert@users.sourceforge.net,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: dynamic /dev security hole?
Date: Mon, 09 Aug 2004 15:49:36 +0100 [thread overview]
Message-ID: <1092062974.14153.26.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.58.0408090025590.26834@vivaldi.madbase.net>
On Llu, 2004-08-09 at 05:40, Eric Lammerts wrote:
> Just an idea for a fix for this problem: If udev would change the
> permissions to 000 and ownership to root.root just before it unlinks
> the device node, the copy would become useless.
Unfortunately not the whole story. The permissions are checked at open
time not on read/write/ioctl so once I have the device opened you
lose. That means you may have to fix the permissions and ownership
before trying to unload the device. The unload will fail if it is still
busy but if not then nobody will be able to open the dev node and
whatever file it now points to.
next prev parent reply other threads:[~2004-08-09 15:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-08 12:47 dynamic /dev security hole? Albert Cahalan
2004-08-08 15:58 ` Marc Ballarin
2004-08-08 15:04 ` Albert Cahalan
2004-08-08 20:42 ` Greg KH
2004-08-08 16:21 ` Greg KH
2004-08-08 21:43 ` Marc Ballarin
2004-08-08 22:07 ` Marc Ballarin
2004-08-09 4:40 ` Eric Lammerts
2004-08-09 13:30 ` Michael Buesch
2004-08-09 13:19 ` Albert Cahalan
2004-08-09 16:54 ` Michael Buesch
2004-08-09 17:04 ` Eric Lammerts
2004-08-09 17:14 ` Michael Buesch
2004-08-10 0:21 ` Greg KH
2004-08-11 17:12 ` [RFC, PATCH] sys_revoke(), just a try. (was: Re: dynamic /dev security hole?) Michael Buesch
2004-08-12 16:49 ` Michael Buesch
2004-08-12 19:51 ` Alan Cox
2004-08-12 19:39 ` Albert Cahalan
2004-08-13 12:39 ` Michael Buesch
2004-08-09 14:49 ` Alan Cox [this message]
2004-08-09 16:17 ` dynamic /dev security hole? Eric Lammerts
2004-08-09 15:33 ` Alan Cox
2004-08-09 16:47 ` Eric Lammerts
2004-08-09 17:54 ` Alan Cox
2004-08-10 0:21 ` Greg KH
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