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Re: [Xen-devel] 4.11.0 RC1 panic


  • To: Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 12 Jun 2018 17:29:17 +0100
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  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
  • Delivery-date: Tue, 12 Jun 2018 16:29:30 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 12/06/18 17:00, Manuel Bouyer wrote:
> On Tue, Jun 12, 2018 at 04:54:30PM +0100, Andrew Cooper wrote:
>> On 12/06/18 16:38, Manuel Bouyer wrote:
>>> On Tue, Jun 12, 2018 at 01:39:05PM +0200, Manuel Bouyer wrote:
>>>> I applied this patch to 4.11rc4 (let's not change too much things at the
>>>> same time) and rebooted my test host. Hopefully I'll have some data to 
>>>> report
>>>> soon
>>> Got the first panic (still from a i386 domU):
>>> login: (XEN) d4v0 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], 
>>> stk 0000:ffff8301bf117f78, dr6 ffff0ff0
>>> (XEN) d4v0 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], stk 
>>> 0000:ffff8301bf117f78, dr6 ffff0ff0
>>> (XEN) d4v0 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], stk 
>>> 0000:ffff8301bf117f78, dr6 ffff0ff0
>>> (XEN) d4v0 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], stk 
>>> 0000:ffff8301bf117f78, dr6 ffff0ff0
>>> (XEN) d4v0 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], stk 
>>> 0000:ffff8301bf117f78, dr6 ffff0ff0
>>> (XEN) d4v2 Hit #DB in Xen context: e008:ffff82d08036eb00 [overflow], stk 
>>> 0000:ffff8301bf077f78, dr6 ffff0ff0
>> I presume you're running a XSA-263 (MovSS) exploit in testing?
> Not intentionally, these are the NetBSD test suite and I don't think any
> specifically targets this (there are 759 tests at this time).
> But these includes network tests, so there is probably in kernel bpf code 
> tests.

This specific message can only be triggered (so far as we know) by a
MovSS-deferred #DB, in this case over an `into` instruction.

If this isn't a dedicated test, then whatever you've got in your test
suite came dangerously close to discovering the MovSS issue.

Anyway - it was more of an observation than anything else, to point out
that it isn't liable to be related to the assertion failure.

~Andrew

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