From: Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
To: "Kirill A. Shutemov" <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
Cc: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org,
serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org,
daniel.lezcano-GANU6spQydw@public.gmane.org,
pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
mzxreary-uLTowLwuiw4b1SvskN2V4Q@public.gmane.org,
xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org,
James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org,
tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [RFC 0/4] per-namespace allowed filesystems list
Date: Mon, 23 Jan 2012 23:12:39 +0000 [thread overview]
Message-ID: <20120123231239.GH23916@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20120123230457.GA14347-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
On Tue, Jan 24, 2012 at 01:04:57AM +0200, Kirill A. Shutemov wrote:
> On Mon, Jan 23, 2012 at 09:12:19PM +0000, Al Viro wrote:
> > This is bloody ridiculous; if you want to prevent a luser adming playing with
> > the set of mounts you've given it, the right way to go is not to mess with the
> > "which fs types are allowed" but to add a per-namespace "immutable" flag.
> > And add a new clone(2)/unshare(2) flag, used only along with the CLONE_NEWNS
> > and setting the "immutable" on the copied namespace.
>
> How will it work if we want to allow namespaced environment to mount block
> devices, but not, let say, debugfs?
>
> Differentiation between filesystem type and source is one of broken things
> in Unix API.
Translation, please?
> I don't see an easy way to fix it. Only plan9. :)
Huh? Plan 9 does *not* contain anything of that kind. And their '#<letter>'
convention for in-kernel filesystems is one of the uglier things about their
API, IMO...
next prev parent reply other threads:[~2012-01-23 23:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-23 16:56 [RFC 0/4] per-namespace allowed filesystems list Glauber Costa
2012-01-23 16:56 ` [RFC 2/4] " Glauber Costa
2012-01-23 16:56 ` [RFC 3/4] show only allowed filesystems in /proc/filesystems Glauber Costa
[not found] ` <1327337772-1972-1-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-01-23 16:56 ` [RFC 1/4] move /proc/filesystems inside /proc/self Glauber Costa
2012-01-23 16:56 ` [RFC 4/4] fslist netlink interface Glauber Costa
2012-01-23 19:20 ` [RFC 0/4] per-namespace allowed filesystems list Eric W. Biederman
2012-01-23 21:12 ` Al Viro
[not found] ` <20120123211218.GF23916-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2012-01-23 23:04 ` Kirill A. Shutemov
[not found] ` <20120123230457.GA14347-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
2012-01-23 23:12 ` Al Viro [this message]
2012-01-24 7:17 ` Kirill A. Shutemov
2012-01-24 10:32 ` Glauber Costa
2012-01-24 10:32 ` Glauber Costa
2012-01-24 10:22 ` Glauber Costa
2012-01-24 10:22 ` Glauber Costa
2012-01-24 0:04 ` Eric W. Biederman
[not found] ` <m1vco2m0eh.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2012-01-24 10:31 ` Glauber Costa
2012-01-24 10:31 ` Glauber Costa
[not found] ` <4F1E886A.7000107-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-01-24 11:17 ` Eric W. Biederman
2012-01-24 11:17 ` Eric W. Biederman
2012-01-24 11:24 ` Glauber Costa
2012-01-24 11:24 ` Glauber Costa
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