[PATCH 3.16 23/87] Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD

From: Ben Hutchings
Date: Wed Oct 02 2019 - 15:13:25 EST


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

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

From: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>

commit 7c7da40da1640ce6814dab1e8031b44e19e5a3f6 upstream.

In the case of compat syscall ioctl numbers for UI_BEGIN_FF_UPLOAD and
UI_END_FF_UPLOAD need to be adjusted before being passed on
uinput_ioctl_handler() since code built with -m32 will be passing
slightly different values. Extend the code already covering
UI_SET_PHYS to cover UI_BEGIN_FF_UPLOAD and UI_END_FF_UPLOAD as well.

Reported-by: Pierre-Loup A. Griffais <pgriffais@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/input/misc/uinput.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)

--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -908,13 +908,31 @@ static long uinput_ioctl(struct file *fi

#ifdef CONFIG_COMPAT

-#define UI_SET_PHYS_COMPAT _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
+/*
+ * These IOCTLs change their size and thus their numbers between
+ * 32 and 64 bits.
+ */
+#define UI_SET_PHYS_COMPAT \
+ _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
+#define UI_BEGIN_FF_UPLOAD_COMPAT \
+ _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
+#define UI_END_FF_UPLOAD_COMPAT \
+ _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)

static long uinput_compat_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
- if (cmd == UI_SET_PHYS_COMPAT)
+ switch (cmd) {
+ case UI_SET_PHYS_COMPAT:
cmd = UI_SET_PHYS;
+ break;
+ case UI_BEGIN_FF_UPLOAD_COMPAT:
+ cmd = UI_BEGIN_FF_UPLOAD;
+ break;
+ case UI_END_FF_UPLOAD_COMPAT:
+ cmd = UI_END_FF_UPLOAD;
+ break;
+ }

return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
}