linux-kernel - Re: [patch 2/8] allow unprivileged umount

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Message-Id: <E1HfAf8-0002Ky-00@dorka.pomaz.szeredi.hu>
Date:	Sat, 21 Apr 2007 10:09:42 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	serue@...ibm.com, viro@....linux.org.uk, linuxram@...ibm.com,
	ebiederm@...ssion.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org
Subject: Re: [patch 2/8] allow unprivileged umount

> > +static bool permit_umount(struct vfsmount *mnt, int flags)
> > +{
> >
> > ...
> >
> > +	return mnt->mnt_uid == current->uid;
> > +}
> 
> Yes, this seems very wrong.  I'd have thought that comparing user_struct*'s
> would get us a heck of a lot closer to being able to support aliasing of
> UIDs between different namespaces.
> 

OK, I'll fix this up.

Actually an earlier version of this patch did use user_struct's but
I'd changed it to uids, because it's simpler.  I didn't think about
this being contrary to the id namespaces thing.

Miklos
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