From: "Theodore Ts'o" <tytso@mit.edu>
To: Matthias Schniedermeyer <ms@citd.de>
Cc: Kees Cook <kees@outflux.net>,
Nick Bowler <nbowler@elliptictech.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 3.6
Date: Wed, 3 Oct 2012 19:58:34 -0400 [thread overview]
Message-ID: <20121003235834.GA29174@thunk.org> (raw)
In-Reply-To: <20121003222341.GA20263@citd.de>
On Thu, Oct 04, 2012 at 12:23:41AM +0200, Matthias Schniedermeyer wrote:
> Personally i would have been bitten by this change, because for years i
> have used a symlink in /tmp (which has the sticky bit) to a directory
> somewhere else for historical reasons. But as i was aware of this change
> i fixed my system before booting the new kernel.
As long as you own the symlink, it wouldn't be a problem. The problem
comes when the symlink is owned by some user such as
"untrusted_daemon", which could change where the symlink could point
at any any time --- or could create a new symlink where none had
previously existed in some world-writeable directory such as /tmp.
Now you try to use that symlink, assuming that it points to *foo*,
when in fact it now points to *bar*, and hilarity ensues...
- Ted
prev parent reply other threads:[~2012-10-03 23:58 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-01 0:38 Linux 3.6 Linus Torvalds
2012-10-03 19:46 ` Nick Bowler
2012-10-03 20:05 ` Kees Cook
2012-10-03 20:29 ` Linus Torvalds
2012-10-03 20:41 ` Theodore Ts'o
2012-10-03 20:49 ` Kees Cook
2012-10-03 20:54 ` Linus Torvalds
2012-10-03 20:58 ` Kees Cook
2012-10-03 21:05 ` Alan Cox
2012-10-03 21:04 ` Kees Cook
2012-10-04 13:35 ` Nick Bowler
2012-10-04 15:49 ` Kees Cook
2012-10-04 16:03 ` Nick Bowler
2012-10-04 16:14 ` Kees Cook
2012-10-04 17:16 ` Nick Bowler
2012-10-04 21:30 ` Stefan Richter
2012-10-09 18:51 ` Nick Bowler
2012-10-03 20:49 ` Alan Cox
2012-10-03 22:23 ` Matthias Schniedermeyer
2012-10-03 23:58 ` Theodore Ts'o [this message]
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