linux-kernel - Re: [patch 5/9] unprivileged mounts: allow unprivileged bind mounts

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Message-Id: <E1JCJoQ-0003g9-Nk@pomaz-ex.szeredi.hu>
Date:	Tue, 08 Jan 2008 20:08:34 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	haveblue@...ibm.com
CC:	akpm@...ux-foundation.org, hch@...radead.org, serue@...ibm.com,
	viro@....linux.org.uk, ebiederm@...ssion.com, kzak@...hat.com,
	linux-fsdevel@...r.kernel.org, containers@...ts.osdl.org,
	util-linux-ng@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 5/9] unprivileged mounts: allow unprivileged bind mounts

> On Tue, 2008-01-08 at 12:35 +0100, Miklos Szeredi wrote:
> > +static int reserve_user_mount(void)
> > +{
> > +       int err = 0;
> > +
> > +       spin_lock(&vfsmount_lock);
> > +       if (nr_user_mounts >= max_user_mounts && !capable(CAP_SYS_ADMIN))
> > +               err = -EPERM;
> > +       else
> > +               nr_user_mounts++;
> > +       spin_unlock(&vfsmount_lock);
> > +       return err;
> > +} 
> 
> Would -ENOSPC or -ENOMEM be a more descriptive error here?  

The logic behind EPERM, is that this failure is only for unprivileged
callers.  ENOMEM is too specifically about OOM.  It could be changed
to ENOSPC, ENFILE, EMFILE, or it could remain EPERM.  What do others
think?

Miklos
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