linux-kernel - Re: [PATCH v3 2/2] nsfs: Add an ioctl() to return owner UID of a userns

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Message-ID: <20170117011948.GC10810@odin.tremily.us>
Date:   Mon, 16 Jan 2017 17:19:48 -0800
From:   "W. Trevor King" <wking@...mily.us>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Andrey Vagin <avagin@...nvz.org>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v3 2/2] nsfs: Add an ioctl() to return owner UID of a
 userns

On Tue, Jan 17, 2017 at 02:03:29PM +1300, Michael Kerrisk (man-pages) wrote:
> +	case NS_GET_OWNER_UID:
> +		if (ns->ops->type != CLONE_NEWUSER)
> +			return -EINVAL;
> +		user_ns = container_of(ns, struct user_namespace, ns);
> +		argp = (unsigned int __user *) arg;
> +		uid = from_kuid_munged(current_user_ns(), user_ns->owner);
> +		return put_user(uid, argp);
> …
> +/* Get owner UID for a user namespace */
> +#define NS_GET_OWNER_UID	_IO(NSIO, 0x4)

The comment here should probably be:

  Get owner UID (in the current user namespace) for a user namespace

or some such, to convey that current_user_ns is being passed to
from_kuid_munged.

Cheers,
Trevor

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