linux-kernel - Re: [PATCH 1/2] eCryptfs: Introduce device handle for userspace daemon communications

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Message-Id: <20080415140453.a45a15b4.akpm@linux-foundation.org>
Date:	Tue, 15 Apr 2008 14:04:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michael Halcrow <mhalcrow@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	ecryptfs-devel@...ts.sourceforge.net, containers@...ts.osdl.org
Subject: Re: [PATCH 1/2] eCryptfs: Introduce device handle for userspace
 daemon communications

On Tue, 15 Apr 2008 15:23:13 -0500
Michael Halcrow <mhalcrow@...ibm.com> wrote:

> Functions to facilitate reading and writing to the eCryptfs
> miscellaneous device handle. This will replace the netlink interface
> as the preferred mechanism for communicating with the userspace
> eCryptfs daemon.
> 
> Each user has his own daemon, which registers itself by opening the
> eCryptfs device handle. Only one daemon per euid may be registered at
> any given time. The eCryptfs module sends a message to a daemon by
> adding its message to the daemon's outgoing message queue. The daemon
> reads the device handle to get the oldest message off the queue.
> 
> Incoming messages from the userspace daemon are immediately
> handled. If the message is a response, then the corresponding process
> that is blocked waiting for the response is awakened.
> 

This is a drastic change, but the changelog doesn't tell us why it is being
made!

> ...
> +	rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> +	if (daemon->pid != current->pid) {
> +	rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> +	BUG_ON(current->euid != daemon->euid);
> +	BUG_ON(current->pid != daemon->pid);

This code uses pids and uids all over the place.  Will it operate correctly
in a containerised environment?

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