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authorJiri Slaby <jslaby@suse.cz>2011-08-10 14:59:28 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-23 10:10:38 -0700
commit24d406a6bf736f7aebdc8fa0f0ec86e0890c6d24 (patch)
tree3dfb2053f7785508304fd29d6c1bb6e6a42a7d5c
parentdbb3b1ca5609d1f3848cd387d06cc60aaacf7f98 (diff)
TTY: pty, fix pty counting
tty_operations->remove is normally called like: queue_release_one_tty ->tty_shutdown ->tty_driver_remove_tty ->tty_operations->remove However tty_shutdown() is called from queue_release_one_tty() only if tty_operations->shutdown is NULL. But for pty, it is not. pty_unix98_shutdown() is used there as ->shutdown. So tty_operations->remove of pty (i.e. pty_unix98_remove()) is never called. This results in invalid pty_count. I.e. what can be seen in /proc/sys/kernel/pty/nr. I see this was already reported at: https://lkml.org/lkml/2009/11/5/370 But it was not fixed since then. This patch is kind of a hackish way. The problem lies in ->install. We allocate there another tty (so-called tty->link). So ->install is called once, but ->remove twice, for both tty and tty->link. The fix here is to count both tty and tty->link and divide the count by 2 for user. And to have ->remove called, let's make tty_driver_remove_tty() global and call that from pty_unix98_shutdown() (tty_operations->shutdown). While at it, let's document that when ->shutdown is defined, tty_shutdown() is not called. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Alan Cox <alan@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/tty/pty.c17
-rw-r--r--drivers/tty/tty_io.c3
-rw-r--r--include/linux/tty.h2
-rw-r--r--include/linux/tty_driver.h3
4 files changed, 21 insertions, 4 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 98b6e3bdb000..e809e9d4683c 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -446,8 +446,19 @@ static inline void legacy_pty_init(void) { }
int pty_limit = NR_UNIX98_PTY_DEFAULT;
static int pty_limit_min;
static int pty_limit_max = NR_UNIX98_PTY_MAX;
+static int tty_count;
static int pty_count;
+static inline void pty_inc_count(void)
+{
+ pty_count = (++tty_count) / 2;
+}
+
+static inline void pty_dec_count(void)
+{
+ pty_count = (--tty_count) / 2;
+}
+
static struct cdev ptmx_cdev;
static struct ctl_table pty_table[] = {
@@ -542,6 +553,7 @@ static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
static void pty_unix98_shutdown(struct tty_struct *tty)
{
+ tty_driver_remove_tty(tty->driver, tty);
/* We have our own method as we don't use the tty index */
kfree(tty->termios);
}
@@ -588,7 +600,8 @@ static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
*/
tty_driver_kref_get(driver);
tty->count++;
- pty_count++;
+ pty_inc_count(); /* tty */
+ pty_inc_count(); /* tty->link */
return 0;
err_free_mem:
deinitialize_tty_struct(o_tty);
@@ -602,7 +615,7 @@ err_free_tty:
static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
{
- pty_count--;
+ pty_dec_count();
}
static const struct tty_operations ptm_unix98_ops = {
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 150e4f747c7d..4f1fc81112e6 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1295,8 +1295,7 @@ static int tty_driver_install_tty(struct tty_driver *driver,
*
* Locking: tty_mutex for now
*/
-static void tty_driver_remove_tty(struct tty_driver *driver,
- struct tty_struct *tty)
+void tty_driver_remove_tty(struct tty_driver *driver, struct tty_struct *tty)
{
if (driver->ops->remove)
driver->ops->remove(driver, tty);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 44bc0c5617e1..5f2ede82b3d6 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -421,6 +421,8 @@ extern void tty_driver_flush_buffer(struct tty_struct *tty);
extern void tty_throttle(struct tty_struct *tty);
extern void tty_unthrottle(struct tty_struct *tty);
extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
+extern void tty_driver_remove_tty(struct tty_driver *driver,
+ struct tty_struct *tty);
extern void tty_shutdown(struct tty_struct *tty);
extern void tty_free_termios(struct tty_struct *tty);
extern int is_current_pgrp_orphaned(void);
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 9deeac855240..ecdaeb98b293 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -47,6 +47,9 @@
*
* This routine is called synchronously when a particular tty device
* is closed for the last time freeing up the resources.
+ * Note that tty_shutdown() is not called if ops->shutdown is defined.
+ * This means one is responsible to take care of calling ops->remove (e.g.
+ * via tty_driver_remove_tty) and releasing tty->termios.
*
*
* void (*cleanup)(struct tty_struct * tty);