linux-kernel - Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

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Date:	Wed, 14 Mar 2012 18:58:47 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Amit Shah <amit.shah@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

At 03/14/2012 06:52 PM, Avi Kivity Wrote:
> On 03/14/2012 12:52 PM, Wen Congyang wrote:
>>>
>>>> If so, is this channel visible to guest userspace? If the channle is visible to guest
>>>> userspace, the program running in userspace may write the same message to the channel.
>>>
>>> Access control is via permissions.  You can have udev scripts assign
>>> whatever uid and gid to the port of your interest.  By default, all
>>> ports are only accessible to the root user.
>>
>> We should also prevent root user writing message to this channel if it is
>> used for panicked notification.
>>
> 
> Why?  root can easily cause a panic.
> 

root user can write the same message to virtio-serial while the guest is running...

Thanks
Wen Congyang
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