[Bug 1674399] Re: OpenSSL CPU detection for AMD Ryzen CPUs

[Eric Desrochers]

** Also affects: openssl (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: openssl (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: openssl (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: openssl (Ubuntu Zesty)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1674399

Title:
  OpenSSL CPU detection for AMD Ryzen CPUs

Status in openssl package in Ubuntu:
  Triaged
Status in openssl source package in Xenial:
  Triaged
Status in openssl source package in Zesty:
  Triaged
Status in openssl source package in Artful:
  Triaged

Bug description:
  AMD added support in their processors for SHA Extensions starting with
  Ryzen CPU. Current OpenSSL version in Ryzens still calls SHA for SSSE3
  routine as result a number of extensions were effectively masked on
  Ryzen and shows no improvement.

  It has been brought to my attention that :
  "CPUID detection in OpenSSL does not properly detect potential optimizations for AMD processors."

  After further verification on my side :

  Extended feature flags were not pulled on AMD processors, as result a
  number of extensions were effectively masked on Ryzen CPUs. It should
  have been reported for Excavator since it implements AVX2 extension,
  but apparently nobody noticed ...

  The GitHub PR:
  https://github.com/openssl/openssl/pull/2849

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