linux-kernel - Re: [PATCH 1/3] eCryptfs: Gracefully refuse miscdev file ops on inherited/passed files

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Date:	Fri, 22 Jun 2012 19:47:35 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Tyler Hicks <tyhicks@...onical.com>
Cc:	ecryptfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] eCryptfs: Gracefully refuse miscdev file ops on
 inherited/passed files

On Wed, Jun 13, 2012 at 2:05 AM, Tyler Hicks <tyhicks@...onical.com> wrote:
> File operations on /dev/ecryptfs would BUG() when the operations were
> performed by processes other than the process that originally opened the
> file. This could happen with open files inherited after fork() or file
> descriptors passed through IPC mechanisms. Rather than calling BUG(), an
> error code can be safely returned in most situations.
>
> In ecryptfs_miscdev_release(), eCryptfs still needs to handle the
> release even if the last file reference is being held by a process that
> didn't originally open the file. ecryptfs_find_daemon_by_euid() will not
> be successful, so a pointer to the daemon is stored in the file's
> private_data. The private_data pointer is initialized when the miscdev
> file is opened and only used when the file is released.
>
> https://launchpad.net/bugs/994247
>
> Signed-off-by: Tyler Hicks <tyhicks@...onical.com>
> Reported-by: Sasha Levin <levinsasha928@...il.com>
> Cc: Sasha Levin <levinsasha928@...il.com>
> ---

I've been running it a while now and haven't seen the problem I've
reported reproducing.

Is it possible to merge this fix into 3.5?
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