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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 

Pull input update from Dmitry Torokhov:
 "The only change is David Hermann's new EVIOCREVOKE evdev ioctl that
  allows safely passing file descriptors to input devices to session
  processes and later being able to stop delivery of events through
  these fds so that inactive sessions will no longer receive user input
  that does not belong to them"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: evdev - add EVIOCREVOKE ioctl
This commit is contained in:
Linus Torvalds 2013-09-15 07:13:39 -04:00
parent 05a8252bde c7dc65737c
commit 8bf5e36d04
2 changed files with 32 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/input/evdev.c
View File

@ -48,6 +48,7 @@ struct evdev_client {
struct evdev *evdev;
struct list_head node;
int clkid;
bool revoked;
unsigned int bufsize;
struct input_event buffer[];
};
@ -164,6 +165,9 @@ static void evdev_pass_values(struct evdev_client *client,
struct input_event event;
bool wakeup = false;
if (client->revoked)
return;
event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
mono : real);
@ -240,7 +244,7 @@ static int evdev_flush(struct file *file, fl_owner_t id)
if (retval)
return retval;
if (!evdev->exist)
if (!evdev->exist || client->revoked)
retval = -ENODEV;
else
retval = input_flush_device(&evdev->handle, file);
@ -429,7 +433,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer,
if (retval)
return retval;
if (!evdev->exist) {
if (!evdev->exist || client->revoked) {
retval = -ENODEV;
goto out;
}
@ -482,7 +486,7 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
return -EINVAL;
for (;;) {
if (!evdev->exist)
if (!evdev->exist || client->revoked)
return -ENODEV;
if (client->packet_head == client->tail &&
@ -511,7 +515,7 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
if (!(file->f_flags & O_NONBLOCK)) {
error = wait_event_interruptible(evdev->wait,
client->packet_head != client->tail ||
!evdev->exist);
!evdev->exist || client->revoked);
if (error)
return error;
}
@ -529,7 +533,11 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait)
poll_wait(file, &evdev->wait, wait);
mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
if (evdev->exist && !client->revoked)
mask = POLLOUT | POLLWRNORM;
else
mask = POLLHUP | POLLERR;
if (client->packet_head != client->tail)
mask |= POLLIN | POLLRDNORM;
@ -795,6 +803,17 @@ static int evdev_handle_mt_request(struct input_dev *dev,
return 0;
}
static int evdev_revoke(struct evdev *evdev, struct evdev_client *client,
struct file *file)
{
client->revoked = true;
evdev_ungrab(evdev, client);
input_flush_device(&evdev->handle, file);
wake_up_interruptible(&evdev->wait);
return 0;
}
static long evdev_do_ioctl(struct file *file, unsigned int cmd,
void __user *p, int compat_mode)
{
@ -857,6 +876,12 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
else
return evdev_ungrab(evdev, client);
case EVIOCREVOKE:
if (p)
return -EINVAL;
else
return evdev_revoke(evdev, client, file);
case EVIOCSCLOCKID:
if (copy_from_user(&i, p, sizeof(unsigned int)))
return -EFAULT;
@ -1002,7 +1027,7 @@ static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
if (retval)
return retval;
if (!evdev->exist) {
if (!evdev->exist || client->revoked) {
retval = -ENODEV;
goto out;
}

1
include/uapi/linux/input.h
View File

@ -152,6 +152,7 @@ struct input_keymap_entry {
#define EVIOCGEFFECTS _IOR('E', 0x84, int) /* Report number of effects playable at the same time */
#define EVIOCGRAB _IOW('E', 0x90, int) /* Grab/Release device */
#define EVIOCREVOKE _IOW('E', 0x91, int) /* Revoke device access */
#define EVIOCSCLOCKID _IOW('E', 0xa0, int) /* Set clockid to be used for timestamps */