linux-kernel - Re: unprivileged mounts git tree

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Message-ID: <20080904161729.GA26579@us.ibm.com>
Date:	Thu, 4 Sep 2008 11:17:29 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	ebiederm@...ssion.com, akpm@...ux-foundation.org,
	hch@...radead.org, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: unprivileged mounts git tree

Quoting Miklos Szeredi (miklos@...redi.hu):
> On Thu, 04 Sep 2008, Miklos Szeredi wrote:
> > On Thu, 4 Sep 2008, Serge E. Hallyn wrote:
> > > Are you going to revert the change forcing CL_SLAVE for
> > > !capable(CAP_SYS_ADMIN)?  I don't think we want that - I think that
> > > *within* a set of user mounts, propagation should be safe, right?
> > > 
> > > Will you be able to do this soon?  If not, should we just do the part
> > > returning -EPERM when turning a shared mount into a user mount? 
> > 
> > OK, let's do that first and the tricky part (propagation vs. user
> > mounts) later.  Will push after I've tested it.
> 
> Here it is:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git unprivileged-mounts

but you're still doing

	if (IS_MNT_SHARED(old_nd.path.mnt) && !capable(CAP_SYS_ADMIN))
		goto out;

shouldn't it be something like

	if (IS_MNT_SHARED(old_nd.path.mnt) && (old_nd.path.mnt & MNT_USER))
		goto out;

?

> I don't know what's next, this patchset has been in and out of -mm for
> as long as I can remember, but it hasn't generated much interest
> outside the two of us :)
> 
> I do think this is an important feature though, even if not as sexy as
> some other things.
> 
> Al?  Is there any chance of this making it to 2.6.28?
> 
> Thanks,
> Miklos
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