From: Vivek Goyal <vgoyal@redhat.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
Ondrej Mosnacek <omosnace@redhat.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
Mark Salyzyn <salyzyn@android.com>,
Paul Moore <paul@paul-moore.com>,
linux-kernel@vger.kernel.org,
overlayfs <linux-unionfs@vger.kernel.org>,
linux-fsdevel@vger.kernel.org, selinux@vger.kernel.org,
Daniel J Walsh <dwalsh@redhat.com>
Subject: Re: overlayfs access checks on underlying layers
Date: Tue, 4 Dec 2018 10:42:43 -0500 [thread overview]
Message-ID: <20181204154243.GA16818@redhat.com> (raw)
In-Reply-To: <CAJfpegtFVvq286HAorGLg6ywMsfs51KqaQwFkcuV7Dtu8TLaLg@mail.gmail.com>
On Tue, Dec 04, 2018 at 04:31:09PM +0100, Miklos Szeredi wrote:
> On Tue, Dec 4, 2018 at 4:22 PM Vivek Goyal <vgoyal@redhat.com> wrote:
>
> > Having said that, this still create little anomaly when mknod to client
> > is not allowed on context label. So a device file, which is on lower
> > and client can not open it for read/write on host, it can now be opened
> > for read/write because mounter will allow access. So why it is different
> > that regular copy up. Well, in regular copy up, we created a copy of
> > the original object and allowed writing to that object (cp --preserve=all)
> > model. But in case of device file, writes will go to same original
> > object. (And not a separate copy).
>
> That's true.
>
> In that sense copy up of special file should result in upper having
> the same label as of lower, right?
I guess that might be reasonable (if this behavior is a concern). So even
after copy up, client will not be able to read/write a device if it was
not allowed on lower.
Stephen, what do you think about retaining label of lower for device
files during copy up. What about socket/fifo.
Thanks
Vivek
next prev parent reply other threads:[~2018-12-04 15:42 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-27 19:55 overlayfs access checks on underlying layers Miklos Szeredi
2018-11-27 19:58 ` Miklos Szeredi
2018-11-27 21:05 ` Vivek Goyal
2018-11-28 10:00 ` Miklos Szeredi
2018-11-28 17:03 ` Vivek Goyal
2018-11-28 19:34 ` Stephen Smalley
2018-11-28 20:24 ` Miklos Szeredi
2018-11-28 21:46 ` Stephen Smalley
2018-11-29 11:04 ` Miklos Szeredi
2018-11-29 13:49 ` Vivek Goyal
2019-03-04 17:01 ` Mark Salyzyn
2019-03-04 17:56 ` Casey Schaufler
2019-03-04 18:44 ` Stephen Smalley
2019-03-04 19:21 ` Amir Goldstein
2018-11-29 16:16 ` Stephen Smalley
2018-11-29 16:22 ` Stephen Smalley
2018-11-29 19:47 ` Miklos Szeredi
2018-11-29 21:03 ` Stephen Smalley
2018-11-29 21:19 ` Stephen Smalley
2018-12-04 13:32 ` Miklos Szeredi
2018-12-04 14:30 ` Stephen Smalley
2018-12-04 14:45 ` Miklos Szeredi
2018-12-04 15:35 ` Stephen Smalley
2018-12-04 15:39 ` Miklos Szeredi
2018-12-11 15:50 ` Paul Moore
2018-12-04 15:15 ` Vivek Goyal
2018-12-04 15:22 ` Vivek Goyal
2018-12-04 15:31 ` Miklos Szeredi
2018-12-04 15:42 ` Vivek Goyal [this message]
2018-12-04 16:05 ` Stephen Smalley
2018-12-04 16:17 ` Vivek Goyal
2018-12-04 16:49 ` Stephen Smalley
2018-12-05 13:43 ` Vivek Goyal
2018-12-06 20:26 ` Stephen Smalley
2018-12-11 21:48 ` Vivek Goyal
2018-12-12 14:51 ` Stephen Smalley
2018-12-13 14:58 ` Vivek Goyal
2018-12-13 16:12 ` Stephen Smalley
2018-12-13 18:54 ` Vivek Goyal
2018-12-13 20:09 ` Stephen Smalley
2018-12-13 20:26 ` Vivek Goyal
2018-12-04 15:42 ` Stephen Smalley
2018-12-04 16:15 ` Vivek Goyal
2018-11-29 22:22 ` Daniel Walsh
2018-12-03 23:27 ` Paul Moore
2018-12-04 14:43 ` Stephen Smalley
2018-12-04 23:01 ` Paul Moore
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