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[Bug 1550468] Re: kernel: correct restore of high gprs on signal return


** Changed in: linux (Ubuntu)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu)
     Assignee: Skipper Bug Screeners (skipper-screen-team) => Andy Whitcroft (apw)

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  kernel: correct restore of high gprs on signal return

Status in linux package in Ubuntu:

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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