From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 29 Jan 2014 22:05:44 +0000 (-0800)
Subject: fs/compat: fix parameter handling for compat readv/writev syscalls
X-Git-Tag: v3.14-rc1~12^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfd948e32af2e7b28bcd7a490c0a30d4b8df2a36;p=pandora-kernel.git

fs/compat: fix parameter handling for compat readv/writev syscalls

We got a report that the pwritev syscall does not work correctly in
compat mode on s390.

It turned out that with commit 72ec35163f9f ("switch compat readv/writev
variants to COMPAT_SYSCALL_DEFINE") we lost the zero extension of a
couple of syscall parameters because the some parameter types haven't
been converted from unsigned long to compat_ulong_t.

This is needed for architectures where the ABI requires that the caller
of a function performed zero and/or sign extension to 64 bit of all
parameters.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <stable@vger.kernel.org>	[v3.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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