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Re: [Xen-devel] [PATCH 0/4] x86: further L1TF / XSA-289 guards


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Juergen Gross <jgross@xxxxxxxx>
  • Date: Thu, 31 Jan 2019 15:16:13 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Norbert Manthey <nmanthey@xxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Thu, 31 Jan 2019 14:16:25 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 31/01/2019 15:07, Jan Beulich wrote:
> This goes alongside Norbert's series, dealing with a few more
> places where I happened to know (without any analysis tools)
> guest controlled array accesses sit. I've additionally also
> checked emul-i8254.c, and I think no adjustments are needed
> there (there are a few possible overruns by one, but just like
> is the case in patch 2 I don't think they are actual issues).
> 
> 1: x86emul: avoid speculative out of bounds accesses
> 2: x86/vMSI: avoid speculative out of bounds accesses
> 3: x86/vPIC: avoid speculative out of bounds accesses
> 4: x86/vLAPIC: avoid speculative out of bounds accesses
> 
> Jürgen, I've copied you anyway, but I assume your general
> Rab-until-RC3 would apply to this series (and perhaps to
> further ones, should anyone find time) as much as to Norbert's.

Your assumption is correct.


Juergen

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