From: Colin Walters <walters@verbum.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Casey Schaufler <casey@schaufler-ca.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jamie Lokier <jamie@shareable.org>,
Will Drewry <wad@chromium.org>,
linux-kernel@vger.kernel.org, keescook@chromium.org,
john.johansen@canonical.com, serge.hallyn@canonical.com,
coreyb@linux.vnet.ibm.com, pmoore@redhat.com, eparis@redhat.com,
djm@mindrot.org, segoon@openwall.com, rostedt@goodmis.org,
jmorris@namei.org, scarybeasts@gmail.com, avi@redhat.com,
penberg@cs.helsinki.fi, viro@zeniv.linux.org.uk, mingo@elte.hu,
akpm@linux-foundation.org, khilman@ti.com,
borislav.petkov@amd.com, amwang@redhat.com, oleg@redhat.com,
ak@linux.intel.com, eric.dumazet@gmail.com, gregkh@suse.de,
dhowells@redhat.com, daniel.lezcano@free.fr,
linux-fsdevel@vger.kernel.org,
linux-security-module@vger.kernel.org, olofj@chromium.org,
mhalcrow@google.com, dlaor@redhat.com, corbet@lwn.net,
alan@lxorguk.ukuu.org.uk
Subject: Re: [PATCH 4/4] Allow unprivileged chroot when safe
Date: Mon, 16 Jan 2012 14:26:05 -0500 [thread overview]
Message-ID: <1326741967.3467.8.camel@lenny> (raw)
In-Reply-To: <c4c1a0e710a50e48221aa28d2b60b486ab686369.1326673414.git.luto@amacapital.net>
On Sun, 2012-01-15 at 16:37 -0800, Andy Lutomirski wrote:
> Because chroot is an easy way to break out of chroot jail, CAP_SYS_ADMIN
> is still required if the caller is already chrooted.
This part is pretty gross. It means it won't work for stuff like
containers (systemd-nspawn etc.) and furthermore I have plans that
involve running OS trees inside a chroot, and this would obviously not
work for that.
Incidentally I ended up putting my setuid program here:
http://git.gnome.org/browse/linux-user-chroot/
Now unfortunately, even if we say that a new setuid program is the way
to gain these privileges, you still can't nest it, because all of these
things are predicated on disabling setuid programs. But it would at
least not fail initially if your process was inside a chroot.
next prev parent reply other threads:[~2012-01-16 19:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 0:37 [PATCH v2 0/4] PR_SET_NO_NEW_PRIVS, unshare, and chroot Andy Lutomirski
2012-01-16 0:37 ` [PATCH v2 1/4] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs Andy Lutomirski
2012-01-16 17:33 ` Oleg Nesterov
2012-01-16 20:15 ` Andy Lutomirski
2012-01-16 0:37 ` [PATCH v2 2/4] Fix apparmor for PR_{GET,SET}_NO_NEW_PRIVS Andy Lutomirski
2012-01-16 0:37 ` [PATCH v2 3/4] Allow unprivileged CLONE_NEWUTS and CLONE_NEWIPC with no_new_privs Andy Lutomirski
2012-01-16 0:37 ` [PATCH 4/4] Allow unprivileged chroot when safe Andy Lutomirski
2012-01-16 0:45 ` Linus Torvalds
2012-01-16 1:08 ` Andy Lutomirski
2012-01-16 19:26 ` Colin Walters [this message]
2012-01-16 20:18 ` Andy Lutomirski
2012-01-17 10:14 ` Jamie Lokier
2012-01-16 20:06 ` Al Viro
2012-01-16 20:15 ` Andy Lutomirski
2012-01-16 20:26 ` Al Viro
2012-01-17 16:23 ` Oleg Nesterov
2012-01-17 16:31 ` Andy Lutomirski
2012-01-16 1:04 ` [PATCH v2 0/4] PR_SET_NO_NEW_PRIVS, unshare, and chroot Andy Lutomirski
2012-01-16 20:49 ` Colin Walters
2012-01-16 21:25 ` Andy Lutomirski
2012-01-16 21:47 ` Colin Walters
2012-01-16 21:57 ` Andy Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1326741967.3467.8.camel@lenny \
--to=walters@verbum.org \
--cc=ak@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=amwang@redhat.com \
--cc=avi@redhat.com \
--cc=borislav.petkov@amd.com \
--cc=casey@schaufler-ca.com \
--cc=corbet@lwn.net \
--cc=coreyb@linux.vnet.ibm.com \
--cc=daniel.lezcano@free.fr \
--cc=dhowells@redhat.com \
--cc=djm@mindrot.org \
--cc=dlaor@redhat.com \
--cc=eparis@redhat.com \
--cc=eric.dumazet@gmail.com \
--cc=gregkh@suse.de \
--cc=jamie@shareable.org \
--cc=jmorris@namei.org \
--cc=john.johansen@canonical.com \
--cc=keescook@chromium.org \
--cc=khilman@ti.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=mhalcrow@google.com \
--cc=mingo@elte.hu \
--cc=oleg@redhat.com \
--cc=olofj@chromium.org \
--cc=penberg@cs.helsinki.fi \
--cc=pmoore@redhat.com \
--cc=rostedt@goodmis.org \
--cc=scarybeasts@gmail.com \
--cc=segoon@openwall.com \
--cc=serge.hallyn@canonical.com \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
--cc=wad@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).