diff options
Diffstat (limited to 'drivers/input/misc/uinput.c')
| -rw-r--r-- | drivers/input/misc/uinput.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index d8ae08d12abf..856936247500 100644 --- a/drivers/input/misc/uinput.c +++ b/drivers/input/misc/uinput.c @@ -20,6 +20,8 @@ * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> * * Changes/Revisions: + * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) + * - add UI_GET_SYSNAME ioctl * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) * - updated ff support for the changes in kernel interface * - added MODULE_VERSION @@ -670,6 +672,31 @@ static int uinput_ff_upload_from_user(const char __user *buffer, __ret; \ }) +static int uinput_str_to_user(void __user *dest, const char *str, + unsigned int maxlen) +{ + char __user *p = dest; + int len, ret; + + if (!str) + return -ENOENT; + + if (maxlen == 0) + return -EINVAL; + + len = strlen(str) + 1; + if (len > maxlen) + len = maxlen; + + ret = copy_to_user(p, str, len); + if (ret) + return -EFAULT; + + /* force terminating '\0' */ + ret = put_user(0, p + len - 1); + return ret ? -EFAULT : len; +} + static long uinput_ioctl_handler(struct file *file, unsigned int cmd, unsigned long arg, void __user *p) { @@ -679,6 +706,8 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd, struct uinput_ff_erase ff_erase; struct uinput_request *req; char *phys; + const char *name; + unsigned int size; retval = mutex_lock_interruptible(&udev->mutex); if (retval) @@ -831,6 +860,20 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd, goto out; } + size = _IOC_SIZE(cmd); + + /* Now check variable-length commands */ + switch (cmd & ~IOCSIZE_MASK) { + case UI_GET_SYSNAME(0): + if (udev->state != UIST_CREATED) { + retval = -ENOENT; + goto out; + } + name = dev_name(&udev->dev->dev); + retval = uinput_str_to_user(p, name, size); + goto out; + } + retval = -EINVAL; out: mutex_unlock(&udev->mutex); |