From: James Morris <jmorris@namei.org>
To: Djalal Harouni <tixxdz@gmail.com>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
linux-security-module@vger.kernel.org,
Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Lafcadio Wluiki <wluikil@gmail.com>,
Dongsu Park <dongsu@endocode.com>,
Andy Lutomirski <luto@kernel.org>,
James Morris <james.l.morris@oracle.com>,
serge@hallyn.com, Al Viro <viro@zeniv.linux.org.uk>,
Daniel Mack <daniel@zonque.org>, Jann Horn <jann@thejh.net>,
Elena Reshetova <elena.reshetova@intel.com>
Subject: Re: [RFC/PATCH 2/3] security: Add the Timgad module
Date: Fri, 3 Feb 2017 12:02:55 +1100 (AEDT) [thread overview]
Message-ID: <alpine.LRH.2.20.1702031159120.3285@namei.org> (raw)
In-Reply-To: <1486055094-4532-3-git-send-email-djalal@gmail.com>
On Thu, 2 Feb 2017, Djalal Harouni wrote:
> *) The per-process prctl() settings are:
> prctl(PR_TIMGAD_OPTS, PR_TIGMAD_SET_MOD_RESTRICT, value, 0, 0)
>
> Where value means:
>
> 0 - Classic module load and unload permissions, nothing changes.
>
> 1 - The current process must have CAP_SYS_MODULE to be able to load and
> unload modules. CAP_NET_ADMIN should allow the current process to
> load and unload only netdev aliased modules, not implemented
>
> 2 - Current process can not loaded nor unloaded modules.
>
> *) sysctl interface supports the followin values:
>
> 0 - Classic module load and unload permissions, nothing changes.
>
> 1 - Only privileged processes with CAP_SYS_MODULE should be able to load and
> unload modules.
>
> To be added: processes with CAP_NET_ADMIN should be able to
> load and unload only netdev aliased modules, this is currently not
> supported. Other checks for real root without CAP_SYS_MODULE ? ...
>
> (This should be improved)
>
> 2 - Modules can not be loaded nor unloaded. Once set, this sysctl value
> cannot be changed.
How is this different to just using CAP_SYS_MODULE?
--
James Morris
<jmorris@namei.org>
next prev parent reply other threads:[~2017-02-03 1:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-02 17:04 [RFC/PATCH 0/3] introduce Timgad LSM Djalal Harouni
2017-02-02 17:04 ` [RFC/PATCH 1/3] security: add the security_task_copy() hook Djalal Harouni
2017-02-06 10:49 ` Tetsuo Handa
2017-02-06 12:40 ` Djalal Harouni
2017-02-06 13:10 ` Djalal Harouni
2017-02-02 17:04 ` [RFC/PATCH 2/3] security: Add the Timgad module Djalal Harouni
2017-02-03 1:02 ` James Morris [this message]
2017-02-06 12:19 ` Djalal Harouni
2017-02-11 0:33 ` Kees Cook
2017-02-14 12:19 ` Djalal Harouni
2017-02-02 17:04 ` [RFC/PATCH 3/3] doc: add Timgad LSM documentation Djalal Harouni
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