[PATCH 3.16 108/305] Input: uinput - handle compat ioctl for UI_SET_PHYS

Ben Hutchings
2016-08-14T10:57:59Z

From: Ricky Liang <jcliang@chromium.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@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Ben Hutchings <ben@decadent.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
@@ -886,9 +886,15 @@ 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