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Re: [Qemu-devel] [PATCH v2] vl.c: disallow command line fw cfg without o

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2] vl.c: disallow command line fw cfg without opt/
Date: Thu, 17 Mar 2016 15:50:08 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 17/03/2016 15:17, Michael S. Tsirkin wrote:
> On Thu, Mar 17, 2016 at 02:55:52PM +0100, Paolo Bonzini wrote:
>> On 17/03/2016 14:49, Michael S. Tsirkin wrote:
>>>> On 17/03/2016 14:13, Michael S. Tsirkin wrote:
>>>>> QEMU command line:
>>>>>   A. -fw-cfg RFQDN/PATH prepends usr/. So users will not get conflicts
>>>>>      with QEMU hardware
>>>> Alternative: no need to prepend usr/, I think.
>>> I personally dislike telling user "do X". I don't see a reason not to be
>>> friendly and do X. The rare case where users do not want X can be
>>> easily enabled.
>> I wouldn't include usr/ at all in the paths.  The RFQDN recommendation
>> is enough to avoid clashes with etc/ and opt/.
> Yes but then we need a blacklist.

Can't the blacklist be as simple as "org.qemu/*", plus some handling of
legacy "etc/*"?

We'd need special handling of "etc/*" anyway because SeaBIOS is using it
(Gerd's usecase) and you certainly don't want to use
org.qemu/unsupported/etc/XYZ hacks for that.


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