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 <jcli...@chromium.org>
---
drivers/input/misc/uinput.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index abe1a92..b4d1b1d 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -984,6 +984,15 @@ static long uinput_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
static long uinput_compat_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
+ switch (_IOC_NR(cmd)) {
+ case _IOC_NR(UI_SET_PHYS):
+ if (_IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
+ cmd &= ~IOCSIZE_MASK;
+ cmd |= sizeof(void *) << IOCSIZE_SHIFT;
+ }
+ break;
+ }
+
return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
}
#endif
--
2.1.2
