From: Kurt Roeckx <Q@ping.be>
To: linux-kernel@vger.kernel.org
Subject: chroot [Was: Re: Linux 2.2.18pre21]
Date: Thu, 16 Nov 2000 21:02:53 +0100 [thread overview]
Message-ID: <20001116210253.A3862@ping.be> (raw)
In-Reply-To: <E13u4XD-0001oe-00@the-village.bc.nu> <20001116150704.A883@emma1.emma.line.org> <20001116171618.A25545@athlon.random> <20001116115249.A8115@wirex.com>
In-Reply-To: <20001116115249.A8115@wirex.com>
On Thu, Nov 16, 2000 at 11:52:49AM -0800, jesse wrote:
> On Thu, Nov 16, 2000 at 05:16:18PM +0100, Andrea Arcangeli wrote:
> > On Thu, Nov 16, 2000 at 03:07:04PM +0100, Matthias Andree wrote:
> > > It shows a program that saves the cwd -- open(".",...) in an open file,
> > > then chroots [..]
> >
> > This is known behaviour (I know Alan knows about it too), solution is to close
> > open directories filedescriptors before chrooting.
> >
> > Everything that happens before chroot(2) is trusted, so it's secure to rely
> > on it to close directories first.
> >
> > If this is not well documented and people doesn't know about it and so they
> > writes unsafe code that's another issue...
>
> But the problem is because you can call chroot when you're already chrooted.
Only if you're root. There are other ways to break out of a
chroot() if you're root too.
Kurt
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next prev parent reply other threads:[~2000-11-16 20:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-10 3:07 Linux 2.2.18pre21 Alan Cox
2000-11-10 3:44 ` David S. Miller
2000-11-10 11:35 ` Benjamin Herrenschmidt
2000-11-10 15:42 ` Tom Rini
2000-11-10 15:34 ` David S. Miller
2000-11-10 10:59 ` Arnaud S . Launay
2000-11-10 10:52 ` David S. Miller
2000-11-16 14:07 ` Matthias Andree
2000-11-16 16:16 ` Andrea Arcangeli
2000-11-16 19:52 ` jesse
2000-11-16 20:02 ` Kurt Roeckx [this message]
2000-11-16 21:40 ` Alan Cox
2000-11-18 10:07 ` Rogier Wolff
2000-11-18 17:32 ` kuznet
2000-11-18 17:34 ` Rogier Wolff
2000-11-18 17:47 ` kuznet
2000-11-18 17:51 ` Rogier Wolff
2000-11-16 22:56 ` Matthias Andree
2000-11-17 6:30 ` Peter Samuelson
2000-11-17 6:40 ` H. Peter Anvin
2000-11-17 11:22 ` Peter Samuelson
2000-11-17 17:35 ` H. Peter Anvin
2000-11-17 11:34 ` Matthias Andree
2000-11-17 19:23 ` jesse
2000-11-18 20:44 ` Pavel Machek
2000-11-18 1:38 ` Nix
2000-11-21 4:19 ` Peter Samuelson
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