linux-kernel - [PATCH 3.2 31/94] Input: uinput - handle compat ioctl for UI_SET

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Date:	Sat, 13 Aug 2016 18:42:58 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Ricky Liang" <jcliang@...omium.org>,
	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Subject: [PATCH 3.2 31/94] Input: uinput - handle compat ioctl for UI_SET_PHYS

3.2.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ricky Liang <jcliang@...omium.org>

commit affa80bd97f7ca282d1faa91667b3ee9e4c590e6 upstream.

When running a 32-bit userspace on a 64-bit kernel, the UI_SET_PHYS
ioctl needs to be treated with special care, as it has the pointer
size encoded in the command.

Signed-off-by: Ricky Liang <jcliang@...omium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/input/misc/uinput.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -786,8 +786,14 @@ static long uinput_ioctl(struct file *fi
 }
 
 #ifdef CONFIG_COMPAT
+
+#define UI_SET_PHYS_COMPAT	_IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
+
 static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
+	if (cmd == UI_SET_PHYS_COMPAT)
+		cmd = UI_SET_PHYS;
+
 	return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 }
 #endif