From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Colin Walters <walters@verbum.org>,
LKML <linux-kernel@vger.kernel.org>,
morgan@kernel.org, serue@us.ibm.com, dhowells@redhat.com,
kzak@redhat.com
Subject: Re: chroot(2) and bind mounts as non-root
Date: Wed, 7 Dec 2011 20:54:59 +0000 [thread overview]
Message-ID: <20111207205459.031a0609@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4EDFCDD4.2080603@zytor.com>
On Wed, 07 Dec 2011 12:34:28 -0800
"H. Peter Anvin" <hpa@zytor.com> wrote:
> On 12/07/2011 09:54 AM, Colin Walters wrote:
> >
> > The historical reason one can't call chroot(2) as non-root is because of
> > setuid binaries (hard link a setuid binary into chroot of your choice
> > with trojaned libc.so).
>
> No. The historical reason is that it lets anyone escape a chroot jail:
Beg to differ
Nobody ever considered chroot a jail except a certain brand of
urban-legend-programming people. Indeed chroot has never been a jail
except in the 'open prison' security sense of it.
The big problem with chroot was abusing setuid binaries - particularly
things like uucp and /bin/mail.
next prev parent reply other threads:[~2011-12-07 20:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-07 17:54 Colin Walters
2011-12-07 19:36 ` John Stoffel
2011-12-08 16:10 ` Colin Walters
2011-12-08 18:14 ` John Stoffel
2011-12-08 18:26 ` Colin Walters
2011-12-09 0:49 ` Sven-Haegar Koch
2011-12-09 14:55 ` John Stoffel
2011-12-09 15:06 ` Colin Walters
2011-12-08 17:04 ` Arnd Bergmann
2011-12-08 17:15 ` Colin Walters
2011-12-07 19:40 ` Andy Lutomirski
2011-12-08 16:58 ` Colin Walters
2011-12-07 20:34 ` H. Peter Anvin
2011-12-07 20:54 ` Alan Cox [this message]
2011-12-15 18:55 ` Andrew G. Morgan
2011-12-16 15:44 ` Colin Walters
2011-12-18 1:22 ` Andrew G. Morgan
2011-12-18 15:19 ` Colin Walters
2011-12-10 5:29 ` Serge E. Hallyn
2011-12-12 16:41 ` Colin Walters
2011-12-12 23:11 ` Serge E. Hallyn
2011-12-15 20:56 ` Colin Walters
2011-12-16 6:14 ` Eric W. Biederman
2011-12-18 16:01 ` Colin Walters
2011-12-19 0:55 ` Eric W. Biederman
2011-12-19 4:06 ` Serge E. Hallyn
2011-12-19 9:22 ` Eric W. Biederman
2011-12-20 16:49 ` Colin Walters
2011-12-20 21:23 ` Colin Walters
2011-12-21 18:15 ` Steve Grubb
2012-01-03 23:13 ` Eric W. Biederman
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