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Re: [Xen-devel] [PATCH v2] x86/vLAPIC: avoid speculative out of bounds accesses


  • To: Jan Beulich <JBeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 19 Jul 2019 15:45:52 +0100
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  • Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Fri, 19 Jul 2019 14:45:59 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 17/07/2019 17:02, Jan Beulich wrote:
> Array indexes used in the MSR read/write emulation functions as well as
> the direct VMX / APIC-V hook are derived from guest controlled values.
> Restrict their ranges to limit the side effects of speculative
> execution.
>
> Along these lines also constrain the vlapic_lvt_mask[] access.
>
> Remove the unused vlapic_lvt_{vector,dm}() instead of adjusting them.
>
> This is part of the speculative hardening effort.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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