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-rw-r--r--drivers/tty/hvc/Kconfig2
-rw-r--r--drivers/tty/pty.c64
-rw-r--r--drivers/tty/serial/8250/8250_gsc.c8
-rw-r--r--drivers/tty/serial/mux.c14
-rw-r--r--drivers/tty/tty_io.c3
5 files changed, 42 insertions, 49 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index b8d5ea0ae26b..fec457edad14 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -4,7 +4,7 @@ config HVC_DRIVER
bool
help
Generic "hypervisor virtual console" infrastructure for various
- hypervisors (pSeries, iSeries, Xen, lguest).
+ hypervisors (pSeries, iSeries, Xen).
It will automatically be selected if one of the back-end console drivers
is selected.
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index bb672ace562f..26dcb3b60fb9 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -69,13 +69,8 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
#ifdef CONFIG_UNIX98_PTYS
if (tty->driver == ptm_driver) {
mutex_lock(&devpts_mutex);
- if (tty->link->driver_data) {
- struct path *path = tty->link->driver_data;
-
- devpts_pty_kill(path->dentry);
- path_put(path);
- kfree(path);
- }
+ if (tty->link->driver_data)
+ devpts_pty_kill(tty->link->driver_data);
mutex_unlock(&devpts_mutex);
}
#endif
@@ -607,25 +602,24 @@ static inline void legacy_pty_init(void) { }
static struct cdev ptmx_cdev;
/**
- * pty_open_peer - open the peer of a pty
- * @tty: the peer of the pty being opened
+ * ptm_open_peer - open the peer of a pty
+ * @master: the open struct file of the ptmx device node
+ * @tty: the master of the pty being opened
+ * @flags: the flags for open
*
- * Open the cached dentry in tty->link, providing a safe way for userspace
- * to get the slave end of a pty (where they have the master fd and cannot
- * access or trust the mount namespace /dev/pts was mounted inside).
+ * Provide a race free way for userspace to open the slave end of a pty
+ * (where they have the master fd and cannot access or trust the mount
+ * namespace /dev/pts was mounted inside).
*/
-static struct file *pty_open_peer(struct tty_struct *tty, int flags)
-{
- if (tty->driver->subtype != PTY_TYPE_MASTER)
- return ERR_PTR(-EIO);
- return dentry_open(tty->link->driver_data, flags, current_cred());
-}
-
-static int pty_get_peer(struct tty_struct *tty, int flags)
+int ptm_open_peer(struct file *master, struct tty_struct *tty, int flags)
{
int fd = -1;
- struct file *filp = NULL;
+ struct file *filp;
int retval = -EINVAL;
+ struct path path;
+
+ if (tty->driver != ptm_driver)
+ return -EIO;
fd = get_unused_fd_flags(0);
if (fd < 0) {
@@ -633,7 +627,16 @@ static int pty_get_peer(struct tty_struct *tty, int flags)
goto err;
}
- filp = pty_open_peer(tty, flags);
+ /* Compute the slave's path */
+ path.mnt = devpts_mntget(master, tty->driver_data);
+ if (IS_ERR(path.mnt)) {
+ retval = PTR_ERR(path.mnt);
+ goto err_put;
+ }
+ path.dentry = tty->link->driver_data;
+
+ filp = dentry_open(&path, flags, current_cred());
+ mntput(path.mnt);
if (IS_ERR(filp)) {
retval = PTR_ERR(filp);
goto err_put;
@@ -662,8 +665,6 @@ static int pty_unix98_ioctl(struct tty_struct *tty,
return pty_get_pktmode(tty, (int __user *)arg);
case TIOCGPTN: /* Get PT Number */
return put_user(tty->index, (unsigned int __user *)arg);
- case TIOCGPTPEER: /* Open the other end */
- return pty_get_peer(tty, (int) arg);
case TIOCSIG: /* Send signal to other side of pty */
return pty_signal(tty, (int) arg);
}
@@ -797,7 +798,6 @@ static int ptmx_open(struct inode *inode, struct file *filp)
{
struct pts_fs_info *fsi;
struct tty_struct *tty;
- struct path *pts_path;
struct dentry *dentry;
int retval;
int index;
@@ -851,26 +851,16 @@ static int ptmx_open(struct inode *inode, struct file *filp)
retval = PTR_ERR(dentry);
goto err_release;
}
- /* We need to cache a fake path for TIOCGPTPEER. */
- pts_path = kmalloc(sizeof(struct path), GFP_KERNEL);
- if (!pts_path)
- goto err_release;
- pts_path->mnt = filp->f_path.mnt;
- pts_path->dentry = dentry;
- path_get(pts_path);
- tty->link->driver_data = pts_path;
+ tty->link->driver_data = dentry;
retval = ptm_driver->ops->open(tty, filp);
if (retval)
- goto err_path_put;
+ goto err_release;
tty_debug_hangup(tty, "opening (count=%d)\n", tty->count);
tty_unlock(tty);
return 0;
-err_path_put:
- path_put(pts_path);
- kfree(pts_path);
err_release:
tty_unlock(tty);
// This will also put-ref the fsi
diff --git a/drivers/tty/serial/8250/8250_gsc.c b/drivers/tty/serial/8250/8250_gsc.c
index 0c078ccab06d..df2931e1e086 100644
--- a/drivers/tty/serial/8250/8250_gsc.c
+++ b/drivers/tty/serial/8250/8250_gsc.c
@@ -80,7 +80,7 @@ static int __init serial_init_chip(struct parisc_device *dev)
return 0;
}
-static const struct parisc_device_id serial_tbl[] = {
+static const struct parisc_device_id serial_tbl[] __initconst = {
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00075 },
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008c },
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008d },
@@ -94,7 +94,7 @@ static const struct parisc_device_id serial_tbl[] = {
* which only knows about Lasi and then a second which will find all the
* other serial ports. HPUX ignores this problem.
*/
-static const struct parisc_device_id lasi_tbl[] = {
+static const struct parisc_device_id lasi_tbl[] __initconst = {
{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03B, 0x0008C }, /* C1xx/C1xxL */
{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03C, 0x0008C }, /* B132L */
{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03D, 0x0008C }, /* B160L */
@@ -110,13 +110,13 @@ static const struct parisc_device_id lasi_tbl[] = {
MODULE_DEVICE_TABLE(parisc, serial_tbl);
-static struct parisc_driver lasi_driver = {
+static struct parisc_driver lasi_driver __refdata = {
.name = "serial_1",
.id_table = lasi_tbl,
.probe = serial_init_chip,
};
-static struct parisc_driver serial_driver = {
+static struct parisc_driver serial_driver __refdata = {
.name = "serial",
.id_table = serial_tbl,
.probe = serial_init_chip,
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 5ee5b9f3c6da..2bff69e70e4b 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -503,7 +503,7 @@ static int __init mux_probe(struct parisc_device *dev)
return 0;
}
-static int mux_remove(struct parisc_device *dev)
+static int __exit mux_remove(struct parisc_device *dev)
{
int i, j;
int port_count = (long)dev_get_drvdata(&dev->dev);
@@ -536,13 +536,13 @@ static int mux_remove(struct parisc_device *dev)
* This table only contains the parisc_device_id of known builtin mux
* devices. All other mux cards will be detected by the generic mux_tbl.
*/
-static const struct parisc_device_id builtin_mux_tbl[] = {
+static const struct parisc_device_id builtin_mux_tbl[] __initconst = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */
{ 0, }
};
-static const struct parisc_device_id mux_tbl[] = {
+static const struct parisc_device_id mux_tbl[] __initconst = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
{ 0, }
};
@@ -550,18 +550,18 @@ static const struct parisc_device_id mux_tbl[] = {
MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl);
MODULE_DEVICE_TABLE(parisc, mux_tbl);
-static struct parisc_driver builtin_serial_mux_driver = {
+static struct parisc_driver builtin_serial_mux_driver __refdata = {
.name = "builtin_serial_mux",
.id_table = builtin_mux_tbl,
.probe = mux_probe,
- .remove = mux_remove,
+ .remove = __exit_p(mux_remove),
};
-static struct parisc_driver serial_mux_driver = {
+static struct parisc_driver serial_mux_driver __refdata = {
.name = "serial_mux",
.id_table = mux_tbl,
.probe = mux_probe,
- .remove = mux_remove,
+ .remove = __exit_p(mux_remove),
};
/**
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c3c8fd0ed535..da912517d295 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2527,6 +2527,9 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case TIOCSSERIAL:
tty_warn_deprecated_flags(p);
break;
+ case TIOCGPTPEER:
+ /* Special because the struct file is needed */
+ return ptm_open_peer(file, tty, (int)arg);
default:
retval = tty_jobctrl_ioctl(tty, real_tty, file, cmd, arg);
if (retval != -ENOIOCTLCMD)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.