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Re: [Xen-devel] [PATCH] VMX: make vmx_read_guest_msr() cope with callers not checking its return value

  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Wed, 22 Aug 2018 01:44:52 +0000
  • Accept-language: en-US
  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
  • Delivery-date: Wed, 22 Aug 2018 01:45:04 +0000
  • Dlp-product: dlpe-windows
  • Dlp-reaction: no-action
  • Dlp-version: 11.0.400.15
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Thread-index: AQHUNIvpKhJaQt1NnUGs4BhnW28bWaTLCipw
  • Thread-topic: [PATCH] VMX: make vmx_read_guest_msr() cope with callers not checking its return value
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Wednesday, August 15, 2018 7:34 PM
> 
> It took till the 4.5 backports of the L1TF prereqs that gcc 8.2 finally
> noticed that the vPMU callers, not checking the function's return value,
> may consume uninitialized data. Guard against this by storing zero on
> the error path.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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