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Re: [Qemu-devel] [PATCH] blockdev: Refuse to open encrypted image unless
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH] blockdev: Refuse to open encrypted image unless paused |
Date: |
Wed, 12 Mar 2014 11:19:50 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 |
On 03/12/2014 11:00 AM, Markus Armbruster wrote:
> Opening an encrypted image takes an additional step: setting the key.
> Between open and the key set, the image must not be used.
>
> We have some protection against accidental use in place: you can't
> unpause a guest while we're missing keys. You can, however, hot-plug
> block devices lacking keys into a running guest just fine, or insert
> media lacking keys. In the latter case, notifying the guest of the
> insert is delayed until the key is set, which may suffice to protect
> at least some guests in common usage.
>
> This patch makes the protection apply in more cases, in a rather
> heavy-handed way: it doesn't let you open encrypted images unless
> we're in a paused state.
>
> It doesn't extend the protection to users other than the guest (block
> jobs?). Use of runstate_check() from block.c is disgusting. Best I
> can do right now.
Better than what we had before, and worth having in 2.0
>
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
> block.c | 8 +++++++-
> stubs/Makefile.objs | 1 +
> stubs/runstate-check.c | 6 ++++++
> 3 files changed, 14 insertions(+), 1 deletion(-)
> create mode 100644 stubs/runstate-check.c
>
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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