From: Ondrej Mosnacek <omosnace@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: selinux@vger.kernel.org, Paul Moore <paul@paul-moore.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Linux Security Module list
<linux-security-module@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org,
Daniel Walsh <dwalsh@redhat.com>
Subject: Re: [PATCH 0/3] Allow initializing the kernfs node's secctx based on its parent
Date: Mon, 14 Jan 2019 10:14:32 +0100 [thread overview]
Message-ID: <CAFqZXNu-bHGmUi80UiyW3djcbedycC+0KUyiQuv9-8b+WmrYuA@mail.gmail.com> (raw)
In-Reply-To: <20190111205053.GV2509588@devbig004.ftw2.facebook.com>
On Fri, Jan 11, 2019 at 9:51 PM Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> On Wed, Jan 09, 2019 at 10:10:25AM +0100, Ondrej Mosnacek wrote:
> > The main motivation for this change is that the userspace users of cgroupfs
> > (which is built on kernfs) expect the usual security context inheritance
> > to work under SELinux (see [1] and [2]). This functionality is required for
> > better confinement of containers under SELinux.
>
> Can you please go into details on what the expected use cases are like
> for cgroupfs? It shows up as a filesystem but isn't a real one and
> has its own permission scheme for delegation and stuff. If sysfs
> hasn't needed selinux support, I'm having a bit of difficulty seeing
> why cgroupfs would.
I'm not sure what are the exact needs of the container people, but
IIUC the goal is to make it possible to have a subtree labeled with a
specific label (that gets inherited by newly created cgroups in that
subtree by default) so that container processes do not need to be
given permissions for the whole cgroupfs tree.
I'm cc'ing Dan Walsh, who should be able to explain the use cases in
more details. Dan, this is related to the cgroupfs labeling problem
([1] and [2]). See [3] for the root of this discussion.
[1] https://github.com/SELinuxProject/selinux-kernel/issues/39
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1553803
[3] https://lore.kernel.org/selinux/CAFqZXNsxfjwDaCWDrqxP736y_3Jm-r=twaHtkkTDtMuym774Jw@mail.gmail.com/T/
--
Ondrej Mosnacek <omosnace at redhat dot com>
Associate Software Engineer, Security Technologies
Red Hat, Inc.
next prev parent reply other threads:[~2019-01-14 9:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 9:10 [PATCH 0/3] Allow initializing the kernfs node's secctx based on its parent Ondrej Mosnacek
2019-01-09 9:10 ` [PATCH 1/3] LSM: Add new hook for generic node initialization Ondrej Mosnacek
2019-01-09 14:35 ` Stephen Smalley
2019-01-09 16:06 ` Ondrej Mosnacek
2019-01-09 9:10 ` [PATCH 2/3] selinux: Implement the object_init_security hook Ondrej Mosnacek
2019-01-09 14:40 ` Stephen Smalley
2019-01-11 1:58 ` Paul Moore
2019-01-09 9:10 ` [PATCH 3/3] kernfs: Initialize security of newly created nodes Ondrej Mosnacek
2019-01-09 15:44 ` Stephen Smalley
2019-01-11 2:08 ` Paul Moore
2019-01-11 20:50 ` [PATCH 0/3] Allow initializing the kernfs node's secctx based on its parent Tejun Heo
2019-01-14 9:14 ` Ondrej Mosnacek [this message]
2019-01-14 9:29 ` Ondrej Mosnacek
[not found] ` <64977013-e2a5-809d-7a3f-bffbda9276aa@redhat.com>
2019-01-17 16:15 ` Tejun Heo
2019-01-17 16:39 ` Stephen Smalley
2019-01-17 20:30 ` Daniel Walsh
2019-01-17 20:35 ` Daniel Walsh
2019-01-14 15:50 ` Tejun Heo
2019-01-15 14:36 ` Stephen Smalley
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