From 7d197ed4a68e76000070979563051e08bf6fc0aa Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 24 Feb 2013 01:41:39 -0500
Subject: switch signalfd{,4}() to COMPAT_SYSCALL_DEFINE

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/signalfd.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'fs/signalfd.c')

diff --git a/fs/signalfd.c b/fs/signalfd.c
index b53486961735..424b7b65321f 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -30,6 +30,7 @@
 #include <linux/signalfd.h>
 #include <linux/syscalls.h>
 #include <linux/proc_fs.h>
+#include <linux/compat.h>
 
 void signalfd_cleanup(struct sighand_struct *sighand)
 {
@@ -311,3 +312,33 @@ SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
 {
 	return sys_signalfd4(ufd, user_mask, sizemask, 0);
 }
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
+		     const compat_sigset_t __user *,sigmask,
+		     compat_size_t, sigsetsize,
+		     int, flags)
+{
+	compat_sigset_t ss32;
+	sigset_t tmp;
+	sigset_t __user *ksigmask;
+
+	if (sigsetsize != sizeof(compat_sigset_t))
+		return -EINVAL;
+	if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
+		return -EFAULT;
+	sigset_from_compat(&tmp, &ss32);
+	ksigmask = compat_alloc_user_space(sizeof(sigset_t));
+	if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
+		return -EFAULT;
+
+	return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
+}
+
+COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,
+		     const compat_sigset_t __user *,sigmask,
+		     compat_size_t, sigsetsize)
+{
+	return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
+}
+#endif
-- 
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