From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 29 Jan 2014 22:05:47 +0000 (-0800)
Subject: s390/compat: change parameter types from unsigned long to compat_ulong_t
X-Git-Tag: firefly_0821_release~176^2~4538^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=49382d93852f1ba4a4fbbce20d094f600cc8aff8;p=firefly-linux-kernel-4.4.55.git

s390/compat: change parameter types from unsigned long to compat_ulong_t

Change parameter types of s390's compat ipc syscall from unsigned long
to compat_ulong_t to enforce zero extension of these parameters.

This is not really a bug, since s390_ipc compat syscall is only a
wrapper to the generic compat_sys_ipc() syscall, which performs correct
zero and sign extension.

This was introduced with commit 56e41d3c5aa8 ("merge compat sys_ipc
instances").

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index e030d2bdec1b..db02052bd137 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -286,8 +286,8 @@ asmlinkage long sys32_getegid16(void)
 }
 
 #ifdef CONFIG_SYSVIPC
-COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
-		unsigned long, third, compat_uptr_t, ptr)
+COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
+		compat_ulong_t, third, compat_uptr_t, ptr)
 {
 	if (call >> 16)		/* hack for backward compatibility */
 		return -EINVAL;