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Re: [Xen-devel] [PATCH] viridian: make viridian_time_domain_freeze() safe to call...
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 21 Aug 2019 11:17:35 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 21 Aug 2019 10:18:02 +0000
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On 21/08/2019 10:13, Paul Durrant wrote:
>> -----Original Message-----
>> From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
>> Sent: 21 August 2019 09:52
>> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
>> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx; Jan Beulich <jbeulich@xxxxxxxx>; Andrew
>> Cooper
>> <Andrew.Cooper3@xxxxxxxxxx>; Wei Liu <wl@xxxxxxx>
>> Subject: Re: [PATCH] viridian: make viridian_time_domain_freeze() safe to
>> call...
>>
>> On Wed, Aug 21, 2019 at 09:22:58AM +0100, Paul Durrant wrote:
>>> ...on a partially destroyed domain.
>>>
>>> viridian_time_domain_freeze() and viridian_time_vcpu_freeze() rely
>>> (respectively) on the dynamically allocated per-domain and per-vcpu viridian
>>> areas [1], which are freed during domain_relinquish_resources().
>>> Because arch_domain_pause() can call viridian_domain_time_freeze() this
>>> can lead to host crashes if e.g. a XEN_DOMCTL_pausedomain is issued after
>>> domain_relinquish_resources() has run.
>>>
>>> To prevent such crashes, this patch adds a check of is_dying into
>>> viridian_time_domain_freeze(), and viridian_time_domain_thaw() which is
>>> similarly vulnerable to indirection into freed memory.
>>>
>>> NOTE: The patch also makes viridian_time_vcpu_freeze/thaw() static, since
>>> they have no callers outside of the same source module.
>>>
>>> [1] See commit e7a9b5e72f26 "viridian: separately allocate domain and vcpu
>>> structures".
>>>
>>> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
>> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>
>> Note you could also drop the viridian_ prefix to the now static
>> functions.
>>
> Yeah, they could be dropped. May be a friendly committer could do it? :-)
Done.
~Andrew
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