[PATCH] Input: uinput - handle compat ioctl for UI_SET_PHYS
From: Ricky Liang <hidden>
Date: 2016-05-17 15:40:04
Also in:
lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
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 <redacted> --- 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