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[Bug 1550468] Re: s390x: correct restore of high gprs on signal return

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Date: Sun, 28 Feb 2016 17:54:10 -0000
Reply-to: Bug 1550468 <1550468@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

No support for s390 in Trusty

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Critical
     Assignee: Andy Whitcroft (apw)
       Status: Confirmed

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: Confirmed => Fix Committed

** Changed in: linux (Ubuntu Xenial)
     Assignee: Andy Whitcroft (apw) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: linux (Ubuntu Vivid)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Wily)
       Status: New => In Progress

** Changed in: linux (Ubuntu Wily)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Trusty)
       Status: In Progress => Invalid

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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:
  In Progress
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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