Input: define separate EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2
The desire to keep old names for the EVIOCGKEYCODE/EVIOCSKEYCODE while extending them to support large scancodes was a mistake. While we tried to keep ABI intact (and we succeeded in doing that, programs compiled on older kernels will work on newer ones) there is still a problem with recompiling existing software with newer kernel headers. New kernel headers will supply updated ioctl numbers and kernel will expect that userspace will use struct input_keymap_entry to set and retrieve keymap data. But since the names of ioctls are still the same userspace will happily compile even if not adjusted to make use of the new structure and will start miraculously fail in the field. To avoid this issue let's revert EVIOCGKEYCODE/EVIOCSKEYCODE definitions and add EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2 so that userspace can explicitly select the style of ioctls it wants to employ. Reviewed-by: Henrik Rydberg <rydberg@euromail.se> Acked-by: Jarod Wilson <jarod@redhat.com> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov
Родитель
57a7872fa0
Коммит
ab4e019219
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@ -534,76 +534,73 @@ static int handle_eviocgbit(struct input_dev *dev,
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}
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#undef OLD_KEY_MAX
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static int evdev_handle_get_keycode(struct input_dev *dev,
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void __user *p, size_t size)
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static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
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{
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struct input_keymap_entry ke = {
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.len = sizeof(unsigned int),
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.flags = 0,
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};
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int __user *ip = (int __user *)p;
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int error;
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/* legacy case */
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if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
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return -EFAULT;
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error = input_get_keycode(dev, &ke);
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if (error)
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return error;
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if (put_user(ke.keycode, ip + 1))
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return -EFAULT;
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return 0;
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}
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static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
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{
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struct input_keymap_entry ke;
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int error;
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memset(&ke, 0, sizeof(ke));
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if (copy_from_user(&ke, p, sizeof(ke)))
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return -EFAULT;
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if (size == sizeof(unsigned int[2])) {
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/* legacy case */
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int __user *ip = (int __user *)p;
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error = input_get_keycode(dev, &ke);
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if (error)
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return error;
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if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
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return -EFAULT;
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if (copy_to_user(p, &ke, sizeof(ke)))
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return -EFAULT;
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ke.len = sizeof(unsigned int);
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ke.flags = 0;
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error = input_get_keycode(dev, &ke);
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if (error)
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return error;
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if (put_user(ke.keycode, ip + 1))
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return -EFAULT;
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} else {
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size = min(size, sizeof(ke));
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if (copy_from_user(&ke, p, size))
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return -EFAULT;
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error = input_get_keycode(dev, &ke);
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if (error)
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return error;
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if (copy_to_user(p, &ke, size))
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return -EFAULT;
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}
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return 0;
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}
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static int evdev_handle_set_keycode(struct input_dev *dev,
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void __user *p, size_t size)
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static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
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{
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struct input_keymap_entry ke = {
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.len = sizeof(unsigned int),
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.flags = 0,
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};
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int __user *ip = (int __user *)p;
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if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
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return -EFAULT;
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if (get_user(ke.keycode, ip + 1))
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return -EFAULT;
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return input_set_keycode(dev, &ke);
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}
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static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
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{
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struct input_keymap_entry ke;
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memset(&ke, 0, sizeof(ke));
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if (copy_from_user(&ke, p, sizeof(ke)))
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return -EFAULT;
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if (size == sizeof(unsigned int[2])) {
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/* legacy case */
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int __user *ip = (int __user *)p;
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if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
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return -EFAULT;
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if (get_user(ke.keycode, ip + 1))
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return -EFAULT;
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ke.len = sizeof(unsigned int);
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ke.flags = 0;
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} else {
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size = min(size, sizeof(ke));
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if (copy_from_user(&ke, p, size))
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return -EFAULT;
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if (ke.len > sizeof(ke.scancode))
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return -EINVAL;
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}
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if (ke.len > sizeof(ke.scancode))
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return -EINVAL;
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return input_set_keycode(dev, &ke);
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}
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@ -669,6 +666,18 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
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return evdev_grab(evdev, client);
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else
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return evdev_ungrab(evdev, client);
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case EVIOCGKEYCODE:
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return evdev_handle_get_keycode(dev, p);
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case EVIOCSKEYCODE:
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return evdev_handle_set_keycode(dev, p);
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case EVIOCGKEYCODE_V2:
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return evdev_handle_get_keycode_v2(dev, p);
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case EVIOCSKEYCODE_V2:
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return evdev_handle_set_keycode_v2(dev, p);
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}
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size = _IOC_SIZE(cmd);
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@ -708,12 +717,6 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
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return -EFAULT;
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return error;
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case EVIOC_MASK_SIZE(EVIOCGKEYCODE):
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return evdev_handle_get_keycode(dev, p, size);
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case EVIOC_MASK_SIZE(EVIOCSKEYCODE):
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return evdev_handle_set_keycode(dev, p, size);
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}
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/* Multi-number variable-length handlers */
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@ -104,8 +104,10 @@ struct input_keymap_entry {
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#define EVIOCGREP _IOR('E', 0x03, unsigned int[2]) /* get repeat settings */
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#define EVIOCSREP _IOW('E', 0x03, unsigned int[2]) /* set repeat settings */
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#define EVIOCGKEYCODE _IOR('E', 0x04, struct input_keymap_entry) /* get keycode */
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#define EVIOCSKEYCODE _IOW('E', 0x04, struct input_keymap_entry) /* set keycode */
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#define EVIOCGKEYCODE _IOR('E', 0x04, unsigned int[2]) /* get keycode */
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#define EVIOCGKEYCODE_V2 _IOR('E', 0x04, struct input_keymap_entry)
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#define EVIOCSKEYCODE _IOW('E', 0x04, unsigned int[2]) /* set keycode */
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#define EVIOCSKEYCODE_V2 _IOW('E', 0x04, struct input_keymap_entry)
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#define EVIOCGNAME(len) _IOC(_IOC_READ, 'E', 0x06, len) /* get device name */
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#define EVIOCGPHYS(len) _IOC(_IOC_READ, 'E', 0x07, len) /* get physical location */
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