From: Serge Hallyn <serge.hallyn@canonical.com>
To: Vasiliy Kulikov <segoon@openwall.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [RFC] Make Yama pid_ns aware
Date: Wed, 23 Nov 2011 11:00:04 -0600 [thread overview]
Message-ID: <20111123170004.GA23786@serge-laptop> (raw)
In-Reply-To: <20111123165549.GB3463@albatros>
Quoting Vasiliy Kulikov (segoon@openwall.com):
> On Wed, Nov 23, 2011 at 14:49 +0000, Serge E. Hallyn wrote:
> > Quoting Vasiliy Kulikov (segoon@openwall.com):
> > > Actually, what concerns me is not ptrace, but symlink/hardling
> > > protection. There is no interaction between namespaces in case of
> > > containers via symlinks in the basic case. In case of ptrace I don't
> > > think the child ns may weaken the parent ns - child ns may not access
> > > processes of the parent namespace and everything it may ptrace is
> > > already inside of this ns.
> >
> > Oh, yes. If you're saying the symlink protection shouldn't be
> > per-pidns, I agree it seems an odd fit.
> >
> > How about a version of this patch leaving symlink protection
> > out of pidns (maybe in user ns), and just putting ptrace
> > protection per-pidns?
>
> I don't think moving symlink/hardling from pid ns to user ns is a good
> idea as user ns is not matured yet. Also we (Openwall) want to use Yama
> almost as-is in our RHEL6 and RHEL5-based kernels with OpenVZ support
> which don't have user namespaces yet at all (yes, it is not a cause for
> mainline decisions :-) ).
>
> While user ns is not yet ready, I don't clearly see what is the division
> of security policies among namespaces including user namespace. I had
> a view that all stuff related to processes (i.e. distinct processes in
> several ways) belongs to pid ns, all net stuff to net ns, etc. If we
> differentiate user ns and pid ns, only strictly things handling pids
> (like kill(2), procfs, ptrace(2), etc.) belong to pid ns and all other
> process-related stuff (like credentials handling, these symlink/hardling
> things, etc.) belong to user namespaces.
>
> Can we probably leave them in pid ns for now and when user ns is matured
> just move it from pid ns to user ns? Is it possible without breaking
> Yama's ABI (I think so)?
That's fine with me.
thanks,
-serge
next prev parent reply other threads:[~2011-11-23 17:00 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-26 23:49 [PATCH v6 0/3] security: Yama LSM Kees Cook
2011-10-26 23:49 ` [PATCH 1/3] " Kees Cook
2011-10-26 23:49 ` [PATCH 2/3] security: create task_free security callback Kees Cook
2011-10-26 23:49 ` [PATCH 3/3] security: Yama: add ptrace relationship tracking interface Kees Cook
2011-11-19 16:30 ` Vasiliy Kulikov
2011-11-19 16:59 ` Solar Designer
2011-11-21 18:40 ` Kees Cook
2011-11-01 20:45 ` [PATCH v6 0/3] security: Yama LSM James Morris
2011-11-01 21:05 ` Kees Cook
2011-11-01 21:37 ` James Morris
2011-11-01 23:23 ` Kees Cook
2011-11-18 4:17 ` James Morris
2011-11-18 21:39 ` Kees Cook
2011-11-18 21:45 ` Roland McGrath
2011-11-18 22:44 ` Kees Cook
2011-11-18 23:18 ` Kees Cook
2011-11-21 19:18 ` [RFC] Make Yama pid_ns aware Vasiliy Kulikov
2011-11-21 19:42 ` Kees Cook
2011-11-22 18:13 ` Serge Hallyn
2011-11-22 19:20 ` Vasiliy Kulikov
2011-11-22 20:10 ` Serge Hallyn
2011-11-23 7:45 ` Vasiliy Kulikov
2011-11-23 14:41 ` Serge Hallyn
2011-11-23 14:49 ` Serge E. Hallyn
2011-11-23 16:55 ` Vasiliy Kulikov
2011-11-23 17:00 ` Serge Hallyn [this message]
2011-11-28 18:12 ` Kees Cook
2011-11-28 18:14 ` Vasiliy Kulikov
2011-11-28 19:16 ` [RFC -resend] " Vasiliy Kulikov
2011-11-28 19:35 ` Kees Cook
2011-11-28 20:15 ` Kees Cook
2011-11-28 20:00 ` Serge E. Hallyn
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=20111123170004.GA23786@serge-laptop \
--to=serge.hallyn@canonical.com \
--cc=keescook@chromium.org \
--cc=kernel-hardening@lists.openwall.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=segoon@openwall.com \
--cc=serge@hallyn.com \
/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
Powered by JetHome