aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/char/n_tty.c29
-rw-r--r--drivers/char/tty_io.c43
-rw-r--r--include/linux/tty_driver.h9
-rw-r--r--include/linux/tty_ldisc.h7
4 files changed, 69 insertions, 19 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 6ac3ca4c723c..b3d4ccc33a47 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1544,21 +1544,18 @@ static unsigned int normal_poll(struct tty_struct * tty, struct file * file, pol
}
struct tty_ldisc tty_ldisc_N_TTY = {
- TTY_LDISC_MAGIC, /* magic */
- "n_tty", /* name */
- 0, /* num */
- 0, /* flags */
- n_tty_open, /* open */
- n_tty_close, /* close */
- n_tty_flush_buffer, /* flush_buffer */
- n_tty_chars_in_buffer, /* chars_in_buffer */
- read_chan, /* read */
- write_chan, /* write */
- n_tty_ioctl, /* ioctl */
- n_tty_set_termios, /* set_termios */
- normal_poll, /* poll */
- NULL, /* hangup */
- n_tty_receive_buf, /* receive_buf */
- n_tty_write_wakeup /* write_wakeup */
+ .magic = TTY_LDISC_MAGIC,
+ .name = "n_tty",
+ .open = n_tty_open,
+ .close = n_tty_close,
+ .flush_buffer = n_tty_flush_buffer,
+ .chars_in_buffer = n_tty_chars_in_buffer,
+ .read = read_chan,
+ .write = write_chan,
+ .ioctl = n_tty_ioctl,
+ .set_termios = n_tty_set_termios,
+ .poll = normal_poll,
+ .receive_buf = n_tty_receive_buf,
+ .write_wakeup = n_tty_write_wakeup
};
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index fc662e4ce58a..fe62c2170d01 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -151,6 +151,12 @@ static int tty_open(struct inode *, struct file *);
static int tty_release(struct inode *, struct file *);
int tty_ioctl(struct inode * inode, struct file * file,
unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+ unsigned long arg);
+#else
+#define tty_compat_ioctl NULL
+#endif
static int tty_fasync(int fd, struct file * filp, int on);
static void release_tty(struct tty_struct *tty, int idx);
static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
@@ -1143,8 +1149,8 @@ static unsigned int hung_up_tty_poll(struct file * filp, poll_table * wait)
return POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDNORM | POLLWRNORM;
}
-static int hung_up_tty_ioctl(struct inode * inode, struct file * file,
- unsigned int cmd, unsigned long arg)
+static long hung_up_tty_ioctl(struct file * file,
+ unsigned int cmd, unsigned long arg)
{
return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
}
@@ -1155,6 +1161,7 @@ static const struct file_operations tty_fops = {
.write = tty_write,
.poll = tty_poll,
.ioctl = tty_ioctl,
+ .compat_ioctl = tty_compat_ioctl,
.open = tty_open,
.release = tty_release,
.fasync = tty_fasync,
@@ -1167,6 +1174,7 @@ static const struct file_operations ptmx_fops = {
.write = tty_write,
.poll = tty_poll,
.ioctl = tty_ioctl,
+ .compat_ioctl = tty_compat_ioctl,
.open = ptmx_open,
.release = tty_release,
.fasync = tty_fasync,
@@ -1179,6 +1187,7 @@ static const struct file_operations console_fops = {
.write = redirected_tty_write,
.poll = tty_poll,
.ioctl = tty_ioctl,
+ .compat_ioctl = tty_compat_ioctl,
.open = tty_open,
.release = tty_release,
.fasync = tty_fasync,
@@ -1189,7 +1198,8 @@ static const struct file_operations hung_up_tty_fops = {
.read = hung_up_tty_read,
.write = hung_up_tty_write,
.poll = hung_up_tty_poll,
- .ioctl = hung_up_tty_ioctl,
+ .unlocked_ioctl = hung_up_tty_ioctl,
+ .compat_ioctl = hung_up_tty_ioctl,
.release = tty_release,
};
@@ -3357,6 +3367,32 @@ int tty_ioctl(struct inode * inode, struct file * file,
return retval;
}
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ struct tty_struct *tty = file->private_data;
+ struct tty_ldisc *ld;
+ int retval = -ENOIOCTLCMD;
+
+ if (tty_paranoia_check(tty, inode, "tty_ioctl"))
+ return -EINVAL;
+
+ if (tty->driver->compat_ioctl) {
+ retval = (tty->driver->compat_ioctl)(tty, file, cmd, arg);
+ if (retval != -ENOIOCTLCMD)
+ return retval;
+ }
+
+ ld = tty_ldisc_ref_wait(tty);
+ if (ld->compat_ioctl)
+ retval = ld->compat_ioctl(tty, file, cmd, arg);
+ tty_ldisc_deref(ld);
+
+ return retval;
+}
+#endif
/*
* This implements the "Secure Attention Key" --- the idea is to
@@ -3689,6 +3725,7 @@ void tty_set_operations(struct tty_driver *driver,
driver->write_room = op->write_room;
driver->chars_in_buffer = op->chars_in_buffer;
driver->ioctl = op->ioctl;
+ driver->compat_ioctl = op->compat_ioctl;
driver->set_termios = op->set_termios;
driver->throttle = op->throttle;
driver->unthrottle = op->unthrottle;
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 659487e3ebeb..85c95cd39bc3 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -52,6 +52,11 @@
* This routine allows the tty driver to implement
* device-specific ioctl's. If the ioctl number passed in cmd
* is not recognized by the driver, it should return ENOIOCTLCMD.
+ *
+ * long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+ * unsigned int cmd, unsigned long arg);
+ *
+ * implement ioctl processing for 32 bit process on 64 bit system
*
* void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
*
@@ -132,6 +137,8 @@ struct tty_operations {
int (*chars_in_buffer)(struct tty_struct *tty);
int (*ioctl)(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg);
+ long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg);
void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
void (*throttle)(struct tty_struct * tty);
void (*unthrottle)(struct tty_struct * tty);
@@ -193,6 +200,8 @@ struct tty_driver {
int (*chars_in_buffer)(struct tty_struct *tty);
int (*ioctl)(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg);
+ long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg);
void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
void (*throttle)(struct tty_struct * tty);
void (*unthrottle)(struct tty_struct * tty);
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index d75932e27710..6226504d9108 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -59,6 +59,11 @@
* low-level driver can "grab" an ioctl request before the line
* discpline has a chance to see it.
*
+ * long (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+ * unsigned int cmd, unsigned long arg);
+ *
+ * Process ioctl calls from 32-bit process on 64-bit system
+ *
* void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
*
* This function notifies the line discpline that a change has
@@ -118,6 +123,8 @@ struct tty_ldisc {
const unsigned char * buf, size_t nr);
int (*ioctl)(struct tty_struct * tty, struct file * file,
unsigned int cmd, unsigned long arg);
+ long (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+ unsigned int cmd, unsigned long arg);
void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
unsigned int (*poll)(struct tty_struct *, struct file *,
struct poll_table_struct *);