From: Andy Lutomirski <luto@kernel.org>
To: Djalal Harouni <tixxdz@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
LSM List <linux-security-module@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>,
Dongsu Park <dpark@posteo.net>,
Casey Schaufler <casey@schaufler-ca.com>,
James Morris <james.l.morris@oracle.com>,
Paul Moore <paul@paul-moore.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Corbet <corbet@lwn.net>, Jessica Yu <jeyu@redhat.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Arnaldo Carvalho de Melo <acme@>
Subject: Re: [PATCH v3 2/2] modules:capabilities: add a per-task modules autoload restriction
Date: Fri, 5 May 2017 09:18:46 -0700 [thread overview]
Message-ID: <CALCETrWahivwjfMLQuLqg5w5K_xZG-+Yczqwr8Xyic4RACyBrA@mail.gmail.com> (raw)
In-Reply-To: <CAEiveUf4p1A1fggwibN+kJW7ruasQCmzr6=GSpTZXoyjJuz00Q@mail.gmail.com>
On Thu, May 4, 2017 at 6:07 AM, Djalal Harouni <tixxdz@gmail.com> wrote:
> On Sat, Apr 22, 2017 at 2:17 PM, Djalal Harouni <tixxdz@gmail.com> wrote:
>> On Sat, Apr 22, 2017 at 1:28 AM, Andy Lutomirski <luto@amacapital.net> wrote:
> [...]
>>>
>>> My point is that all of these need some way to handle configuration
>>> and inheritance, and I don't think that a bunch of per-task prctls is
>>> the right way. As just an example, saying that interactive users can
>>> autoload modules but other users can't, or that certain systemd
>>> services can, etc, might be nice. Linus already complained that he
>>> (i.e. user "torvalds" or whatever) should be able to profile the
>>> kernel but that other uids should not be able to.
>>
>> Neat, maybe this could already be achieved with this interface and
>> systemd-logind, "ModulesAutoloadUsers=andy" in logind.conf where
>> "andy" is the only logged-in user able to trigger and autoload kernel
>> modules. However maybe we should not restrict too much other bits or
>> functionality of the other users, please let me will follow up later
>> on it.
>>
>>> I personally like my implicit_rights idea, and it might be interesting
>>> to prototype it.
>>
>
> Andy following on the idea of per user settings, I'm curious did you
> manage to make some advance on how to store the user settings ? the
> user database format is old and not extensible, there was cgmanager or
> other libcgroup but for resources, and no simple thing for such
> restrictions example: "RestrictLinuxModules=user" that will prevent
> such users from making/loading extra Linux features/modules that are
> not already available...
>
I figured that user code would figure it out somehow. Text config file?
There is another odd way it could be configured: just leave the inodes
around in /dev/rights with appropriate permissions. Some startup
script could re-instantiate them with the same permissions (via a
syscall that does that atomically).
next prev parent reply other threads:[~2017-05-05 16:18 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-19 22:20 [PATCH v3 0/2] modules:capabilities: automatic module loading restrictions Djalal Harouni
2017-04-19 22:20 ` [PATCH v3 1/2] modules:capabilities: automatic module loading restriction Djalal Harouni
2017-04-19 23:16 ` Andy Lutomirski
2017-04-20 2:22 ` Ben Hutchings
2017-04-20 12:44 ` [kernel-hardening] " Djalal Harouni
2017-04-20 15:02 ` Ben Hutchings
[not found] ` <1492700543.31767.23.camel-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org>
2017-04-20 20:39 ` [kernel-hardening] " Djalal Harouni
[not found] ` <CAEiveUdFL53XyQpacmN6f8F28M0bLQDcetpRXJjrJ10vDmQi8Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-20 21:28 ` Kees Cook
2017-04-19 22:20 ` [PATCH v3 2/2] modules:capabilities: add a per-task modules autoload restriction Djalal Harouni
2017-04-19 23:15 ` Andy Lutomirski
2017-04-19 23:43 ` Kees Cook
2017-04-20 2:41 ` Andy Lutomirski
[not found] ` <CALCETrUueOx1tqj+Ru93KGpy2HHR-A_GQ6DrAppiomkPTtX7Lw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-21 23:19 ` Kees Cook
2017-04-21 23:28 ` Andy Lutomirski
2017-04-21 23:40 ` Kees Cook
2017-04-21 23:51 ` Andy Lutomirski
2017-04-22 0:12 ` Djalal Harouni
[not found] ` <CAEiveUcx8fwQgXdLPeMNsTjX2KPhQKH__a-XzcHko_1aCmh4sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-22 1:19 ` Djalal Harouni
2017-04-22 6:51 ` Andy Lutomirski
[not found] ` <CALCETrUT73CcPQx2T=1zWbOUhw9r-c_YqXw5-KTwxgWPgXuTwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-22 19:29 ` Kees Cook
[not found] ` <CAGXu5jLV+WZyj+xnxVFkFEgEthNt6eXdcSgHT-=85mJ1ECZ1Rw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-24 14:25 ` Djalal Harouni
2017-04-24 18:02 ` Kees Cook
[not found] ` <CAGXu5jL_-cxidy_O4ORaN0iX9o7=hsi3DYTRvQs5w5363Z+MVg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-24 18:35 ` Djalal Harouni
2017-04-21 23:52 ` Casey Schaufler
2017-04-22 0:00 ` Andy Lutomirski
2017-04-22 0:13 ` Casey Schaufler
2017-04-22 6:45 ` Andy Lutomirski
2017-04-22 12:17 ` Djalal Harouni
[not found] ` <CAEiveUdbQcfn1xC5xWMv91vL_uR1MGTvARqw-E4GDTMUZ6t=bA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-05-04 13:07 ` Djalal Harouni
2017-05-04 14:58 ` Serge E. Hallyn
2017-05-05 13:06 ` Djalal Harouni
2017-05-05 16:18 ` Andy Lutomirski [this message]
2017-04-20 1:57 ` kbuild test robot
[not found] ` <1492640420-27345-3-git-send-email-tixxdz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-04-19 22:38 ` Djalal Harouni
2017-04-24 4:29 ` Rusty Russell
2017-04-26 9:06 ` Djalal Harouni
2017-04-27 2:07 ` Rusty Russell
[not found] ` <87k266hacq.fsf-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2017-04-27 13:16 ` Djalal Harouni
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=CALCETrWahivwjfMLQuLqg5w5K_xZG-+Yczqwr8Xyic4RACyBrA@mail.gmail.com \
--to=luto@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=casey@schaufler-ca.com \
--cc=corbet@lwn.net \
--cc=dpark@posteo.net \
--cc=gregkh@linuxfoundation.org \
--cc=james.l.morris@oracle.com \
--cc=jeyu@redhat.com \
--cc=keescook@chromium.org \
--cc=kernel-hardening@lists.openwall.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=paul@paul-moore.com \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=rusty@rustcorp.com.au \
--cc=serge@hallyn.com \
--cc=tixxdz@gmail.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;
as well as URLs for NNTP newsgroup(s).