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Re: [Qemu-devel] [PATCH] monitor: move json init from OPEN event to init
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH] monitor: move json init from OPEN event to init |
Date: |
Thu, 23 Aug 2012 14:42:00 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Aug 23, 2012 at 08:22:35AM -0500, Anthony Liguori wrote:
> At some point in the past, the OPEN event was changed to be issued from a
> bottom half. This creates a small window whereas a data callback registered
> in
> init may be invoked before the OPEN event has been issued.
>
> This is reproducible with:
>
> echo "{'execute': 'qmp_capabilities'}" | qemu-system-x86_64 -M none -qmp
> stdio
>
> We can fix this for the monitor by moving the parser initialization to init.
>
> The remaining state that is set in OPEN appears harmless.
>
> Reported-by: Daniel Berrange <address@hidden>
> Signed-off-by: Anthony Liguori <address@hidden>
Signed-off-by: Daniel P. Berrange <address@hidden>
Works in my testing. I have also fixed libvirt so that it does not try
to send commands to QMP, until QMP has sent out its initial greeting,
thus avoiding the flaw too.
Daniel
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