diff options
| -rw-r--r-- | drivers/char/tty_io.c | 19 | ||||
| -rw-r--r-- | include/linux/tty.h | 2 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 7 |
3 files changed, 19 insertions, 9 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 39db186d5c5b..5d405a1bfbe3 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -154,6 +154,7 @@ int tty_ioctl(struct inode * inode, struct file * file, 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); +static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty); /** * alloc_tty_struct - allocate a tty object @@ -1558,6 +1559,18 @@ void disassociate_ctty(int on_exit) unlock_kernel(); } +/** + * + * no_tty - Ensure the current process does not have a controlling tty + */ +void no_tty(void) +{ + struct task_struct *tsk = current; + if (tsk->signal->leader) + disassociate_ctty(0); + proc_clear_tty(tsk); +} + /** * stop_tty - propogate flow control @@ -3280,9 +3293,7 @@ int tty_ioctl(struct inode * inode, struct file * file, case TIOCNOTTY: if (current->signal->tty != tty) return -ENOTTY; - if (current->signal->leader) - disassociate_ctty(0); - proc_clear_tty(current); + no_tty(); return 0; case TIOCSCTTY: return tiocsctty(tty, arg); @@ -3844,7 +3855,7 @@ static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) tsk->signal->tty_old_pgrp = NULL; } -void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) +static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty) { spin_lock_irq(&tsk->sighand->siglock); __proc_set_tty(tsk, tty); diff --git a/include/linux/tty.h b/include/linux/tty.h index dee72b9a20fb..bb4576085203 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -313,6 +313,7 @@ extern int tty_hung_up_p(struct file * filp); extern void do_SAK(struct tty_struct *tty); extern void __do_SAK(struct tty_struct *tty); extern void disassociate_ctty(int priv); +extern void no_tty(void); extern void tty_flip_buffer_push(struct tty_struct *tty); extern speed_t tty_get_baud_rate(struct tty_struct *tty); extern speed_t tty_termios_baud_rate(struct ktermios *termios); @@ -333,7 +334,6 @@ extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd, extern dev_t tty_devnum(struct tty_struct *tty); extern void proc_clear_tty(struct task_struct *p); -extern void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty); extern struct tty_struct *get_current_tty(void); extern struct mutex tty_mutex; diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 885a9a958b8d..fa9dbb6b110d 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1758,12 +1758,11 @@ static inline void flush_unauthorized_files(struct files_struct * files) } } file_list_unlock(); - - /* Reset controlling tty. */ - if (drop_tty) - proc_set_tty(current, NULL); } mutex_unlock(&tty_mutex); + /* Reset controlling tty. */ + if (drop_tty) + no_tty(); /* Revalidate access to inherited open files. */ |