linux-kernel - Re: [PATCH 0/6] File Sealing & memfd

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Date:	Tue, 22 Apr 2014 14:55:37 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Florian Weimer <fweimer@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay@...y.org>, Daniel Mack <zonque@...il.com>,
	Lennart Poettering <lennart@...ttering.net>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 0/6] File Sealing & memfd_create()

Hi

On Tue, Apr 22, 2014 at 2:44 PM, Florian Weimer <fweimer@...hat.com> wrote:
> I didn't find that very convincing.  But in v2, seals are monotonic, so
> checking them should be reliable enough.

Ok.

> What happens when you create a loop device on a write-sealed descriptor?

Any write-back to the loop-device will fail with EPERM as soon as the
fd gets write-sealed. See __do_lo_send_write() in
drivers/block/loop.c. It's up to the loop-device to forward the error
via bio_endio() to the caller for proper error-handling.

Thanks
David
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