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

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Message-Id: <20070421005506.6a315bec.akpm@linux-foundation.org>
Date:	Sat, 21 Apr 2007 00:55:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
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

On Fri, 20 Apr 2007 12:25:34 +0200 Miklos Szeredi <miklos@...redi.hu> wrote:

> +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.

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