From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Tue, 8 Sep 2015 13:25:39 +0000 (+0200)
Subject: s390/compat: correct uc_sigmask of the compat signal frame
X-Git-Tag: omap-for-v4.3/fixes-rc5~101^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d4bd0ed0439dfc780aab801a085961925ed6838;p=pandora-kernel.git

s390/compat: correct uc_sigmask of the compat signal frame

The uc_sigmask in the ucontext structure is an array of words to keep
the 64 signal bits (or 1024 if you ask glibc but the kernel sigset_t
only has 64 bits).

For 64 bit the sigset_t contains a single 8 byte word, but for 31 bit
there are two 4 byte words. The compat signal handler code uses a
simple copy of the 64 bit sigset_t to the 31 bit compat_sigset_t.
As s390 is a big-endian architecture this is incorrect, the two words
in the 31 bit sigset_t array need to be swapped.

Cc: <stable@vger.kernel.org>
Reported-by: Stefan Liebler <stli@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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