diff --git a/drivers/char/pty.c b/drivers/char/pty.c index 2c64faa8efa4527c9ec7d6c8f5e9f3ff72881250..c350d01716bdace6ef510809e964a57c7129134b 100644 --- a/drivers/char/pty.c +++ b/drivers/char/pty.c @@ -675,12 +675,8 @@ static int ptmx_open(struct inode *inode, struct file *filp) } set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ - filp->private_data = tty; - file_sb_list_del(filp); /* __dentry_open has put it on the sb list */ - spin_lock(&tty_files_lock); - list_add(&filp->f_u.fu_list, &tty->tty_files); - spin_unlock(&tty_files_lock); + tty_add_file(tty, filp); retval = devpts_pty_new(inode, tty->link); if (retval) diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index cd5b829634eafaa65d8c6149c7435c37617608e8..949067a0bd4743151515382b07ccf7aecad11316 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -188,6 +188,41 @@ void free_tty_struct(struct tty_struct *tty) kfree(tty); } +static inline struct tty_struct *file_tty(struct file *file) +{ + return ((struct tty_file_private *)file->private_data)->tty; +} + +/* Associate a new file with the tty structure */ +void tty_add_file(struct tty_struct *tty, struct file *file) +{ + struct tty_file_private *priv; + + /* XXX: must implement proper error handling in callers */ + priv = kmalloc(sizeof(*priv), GFP_KERNEL|__GFP_NOFAIL); + + priv->tty = tty; + priv->file = file; + file->private_data = priv; + + spin_lock(&tty_files_lock); + list_add(&priv->list, &tty->tty_files); + spin_unlock(&tty_files_lock); +} + +/* Delete file from its tty */ +void tty_del_file(struct file *file) +{ + struct tty_file_private *priv = file->private_data; + + spin_lock(&tty_files_lock); + list_del(&priv->list); + spin_unlock(&tty_files_lock); + file->private_data = NULL; + kfree(priv); +} + + #define TTY_NUMBER(tty) ((tty)->index + (tty)->driver->name_base) /** @@ -500,6 +535,7 @@ void __tty_hangup(struct tty_struct *tty) struct file *cons_filp = NULL; struct file *filp, *f = NULL; struct task_struct *p; + struct tty_file_private *priv; int closecount = 0, n; unsigned long flags; int refs = 0; @@ -509,7 +545,7 @@ void __tty_hangup(struct tty_struct *tty) spin_lock(&redirect_lock); - if (redirect && redirect->private_data == tty) { + if (redirect && file_tty(redirect) == tty) { f = redirect; redirect = NULL; } @@ -524,7 +560,8 @@ void __tty_hangup(struct tty_struct *tty) spin_lock(&tty_files_lock); /* This breaks for file handles being sent over AF_UNIX sockets ? */ - list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) { + list_for_each_entry(priv, &tty->tty_files, list) { + filp = priv->file; if (filp->f_op->write == redirected_tty_write) cons_filp = filp; if (filp->f_op->write != tty_write) @@ -892,12 +929,10 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { int i; - struct tty_struct *tty; - struct inode *inode; + struct inode *inode = file->f_path.dentry->d_inode; + struct tty_struct *tty = file_tty(file); struct tty_ldisc *ld; - tty = file->private_data; - inode = file->f_path.dentry->d_inode; if (tty_paranoia_check(tty, inode, "tty_read")) return -EIO; if (!tty || (test_bit(TTY_IO_ERROR, &tty->flags))) @@ -1068,12 +1103,11 @@ void tty_write_message(struct tty_struct *tty, char *msg) static ssize_t tty_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct tty_struct *tty; struct inode *inode = file->f_path.dentry->d_inode; + struct tty_struct *tty = file_tty(file); + struct tty_ldisc *ld; ssize_t ret; - struct tty_ldisc *ld; - tty = file->private_data; if (tty_paranoia_check(tty, inode, "tty_write")) return -EIO; if (!tty || !tty->ops->write || @@ -1510,13 +1544,13 @@ static void release_tty(struct tty_struct *tty, int idx) int tty_release(struct inode *inode, struct file *filp) { - struct tty_struct *tty, *o_tty; + struct tty_struct *tty = file_tty(filp); + struct tty_struct *o_tty; int pty_master, tty_closing, o_tty_closing, do_sleep; int devpts; int idx; char buf[64]; - tty = filp->private_data; if (tty_paranoia_check(tty, inode, "tty_release_dev")) return 0; @@ -1674,11 +1708,7 @@ int tty_release(struct inode *inode, struct file *filp) * - do_tty_hangup no longer sees this file descriptor as * something that needs to be handled for hangups. */ - spin_lock(&tty_files_lock); - BUG_ON(list_empty(&filp->f_u.fu_list)); - list_del_init(&filp->f_u.fu_list); - spin_unlock(&tty_files_lock); - filp->private_data = NULL; + tty_del_file(filp); /* * Perform some housekeeping before deciding whether to return. @@ -1845,12 +1875,8 @@ static int tty_open(struct inode *inode, struct file *filp) return PTR_ERR(tty); } - filp->private_data = tty; - BUG_ON(list_empty(&filp->f_u.fu_list)); - file_sb_list_del(filp); /* __dentry_open has put it on the sb list */ - spin_lock(&tty_files_lock); - list_add(&filp->f_u.fu_list, &tty->tty_files); - spin_unlock(&tty_files_lock); + tty_add_file(tty, filp); + check_tty_count(tty, "tty_open"); if (tty->driver->type == TTY_DRIVER_TYPE_PTY && tty->driver->subtype == PTY_TYPE_MASTER) @@ -1926,11 +1952,10 @@ static int tty_open(struct inode *inode, struct file *filp) static unsigned int tty_poll(struct file *filp, poll_table *wait) { - struct tty_struct *tty; + struct tty_struct *tty = file_tty(filp); struct tty_ldisc *ld; int ret = 0; - tty = filp->private_data; if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_poll")) return 0; @@ -1943,11 +1968,10 @@ static unsigned int tty_poll(struct file *filp, poll_table *wait) static int __tty_fasync(int fd, struct file *filp, int on) { - struct tty_struct *tty; + struct tty_struct *tty = file_tty(filp); unsigned long flags; int retval = 0; - tty = filp->private_data; if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_fasync")) goto out; @@ -2501,13 +2525,13 @@ EXPORT_SYMBOL(tty_pair_get_pty); */ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - struct tty_struct *tty, *real_tty; + struct tty_struct *tty = file_tty(file); + struct tty_struct *real_tty; void __user *p = (void __user *)arg; int retval; struct tty_ldisc *ld; struct inode *inode = file->f_dentry->d_inode; - tty = file->private_data; if (tty_paranoia_check(tty, inode, "tty_ioctl")) return -EINVAL; @@ -2629,7 +2653,7 @@ 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_struct *tty = file_tty(file); struct tty_ldisc *ld; int retval = -ENOIOCTLCMD; @@ -2721,7 +2745,7 @@ void __do_SAK(struct tty_struct *tty) if (!filp) continue; if (filp->f_op->read == tty_read && - filp->private_data == tty) { + file_tty(filp) == tty) { printk(KERN_NOTICE "SAK: killed process %d" " (%s): fd#%d opened to the tty\n", task_pid_nr(p), p->comm, i); diff --git a/fs/internal.h b/fs/internal.h index 6b706bc60a66bbb3cecb7477f2ea72e0a091aa84..6a5c13a80660ce22fe349f074413abe60c90751b 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -80,6 +80,8 @@ extern void chroot_fs_refs(struct path *, struct path *); /* * file_table.c */ +extern void file_sb_list_add(struct file *f, struct super_block *sb); +extern void file_sb_list_del(struct file *f); extern void mark_files_ro(struct super_block *); extern struct file *get_empty_filp(void); diff --git a/include/linux/fs.h b/include/linux/fs.h index 5a9a9e5a37056fd7535bdc3e98b24ed14118f1a5..5e65add0f1631632fbbb5f17347a3e1e2aaffea7 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2185,8 +2185,6 @@ static inline void insert_inode_hash(struct inode *inode) { __insert_inode_hash(inode, inode->i_ino); } -extern void file_sb_list_add(struct file *f, struct super_block *sb); -extern void file_sb_list_del(struct file *f); #ifdef CONFIG_BLOCK extern void submit_bio(int, struct bio *); extern int bdev_read_only(struct block_device *); diff --git a/include/linux/tty.h b/include/linux/tty.h index f6b371a2514e4a1a6131e83efbf78bc16cad2a90..67d64e6efe7a8c95d775b6418d2c1c8d728d667d 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -329,6 +329,13 @@ struct tty_struct { struct tty_port *port; }; +/* Each of a tty's open files has private_data pointing to tty_file_private */ +struct tty_file_private { + struct tty_struct *tty; + struct file *file; + struct list_head list; +}; + /* tty magic number */ #define TTY_MAGIC 0x5401 @@ -458,6 +465,7 @@ extern void proc_clear_tty(struct task_struct *p); extern struct tty_struct *get_current_tty(void); extern void tty_default_fops(struct file_operations *fops); extern struct tty_struct *alloc_tty_struct(void); +extern void tty_add_file(struct tty_struct *tty, struct file *file); extern void free_tty_struct(struct tty_struct *tty); extern void initialize_tty_struct(struct tty_struct *tty, struct tty_driver *driver, int idx); diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index bd7da0f0ccf3f58a72784c1ed0e2042eb8cd1b38..4796ddd4e721ae454a02563d713aa235870ece02 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2172,6 +2172,7 @@ static inline void flush_unauthorized_files(const struct cred *cred, if (tty) { spin_lock(&tty_files_lock); if (!list_empty(&tty->tty_files)) { + struct tty_file_private *file_priv; struct inode *inode; /* Revalidate access to controlling tty. @@ -2179,7 +2180,9 @@ static inline void flush_unauthorized_files(const struct cred *cred, than using file_has_perm, as this particular open file may belong to another process and we are only interested in the inode-based check here. */ - file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list); + file_priv = list_first_entry(&tty->tty_files, + struct tty_file_private, list); + file = file_priv->file; inode = file->f_path.dentry->d_inode; if (inode_has_perm(cred, inode, FILE__READ | FILE__WRITE, NULL)) {