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** Branch linked: lp:ubuntu/trusty-proposed/linux-lts-xenial

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https://bugs.launchpad.net/bugs/1550468

Title:
  s390x: correct restore of high gprs on signal return

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Trusty:
  Invalid
Status in linux source package in Vivid:
  Invalid
Status in linux source package in Wily:
  Invalid
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  == Comment: #0 - Hendrik Brueckner - 2016-02-26 11:02:00 ==

  Please backport Linux kernel upstream commit ID:


  commit 342300cc9cd3428bc6bfe5809bfcc1b9a0f06702

  Author: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

  Date:   Fri Feb 19 14:44:14 2016 +0100


      s390/compat: correct restore of high gprs on signal return


      git commit 8070361799ae1e3f4ef347bd10f0a508ac10acfb

      "s390: add support for vector extension"

      broke 31-bit compat processes in regard to signal handling.


      The restore_sigregs_ext32() function is used to restore the
  additional

      elements from the user space signal frame. Among the additional
  elements

      are the upper registers halves for 64-bit register support for
  31-bit

      processes. The copy_from_user that is used to retrieve the high-
  gprs

      array from the user stack uses an incorrect length, 8 bytes
  instead of

      64 bytes. This causes incorrect upper register halves to get
  loaded.


      Cc: stable@xxxxxxxxxxxxxxx # 3.8+

      Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

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