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Message #163219
[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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https://bugs.launchpad.net/bugs/1550468
Title:
kernel: correct restore of high gprs on signal return
Status in linux package in Ubuntu:
Confirmed
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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