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TOMOYO Linux Cross Reference
Linux/fs/devpts/inode.c

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  1 /* -*- linux-c -*- --------------------------------------------------------- *
  2  *
  3  * linux/fs/devpts/inode.c
  4  *
  5  *  Copyright 1998-2004 H. Peter Anvin -- All Rights Reserved
  6  *
  7  * This file is part of the Linux kernel and is made available under
  8  * the terms of the GNU General Public License, version 2, or at your
  9  * option, any later version, incorporated herein by reference.
 10  *
 11  * ------------------------------------------------------------------------- */
 12 
 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 14 
 15 #include <linux/module.h>
 16 #include <linux/init.h>
 17 #include <linux/fs.h>
 18 #include <linux/sched.h>
 19 #include <linux/namei.h>
 20 #include <linux/slab.h>
 21 #include <linux/mount.h>
 22 #include <linux/tty.h>
 23 #include <linux/mutex.h>
 24 #include <linux/magic.h>
 25 #include <linux/idr.h>
 26 #include <linux/devpts_fs.h>
 27 #include <linux/parser.h>
 28 #include <linux/fsnotify.h>
 29 #include <linux/seq_file.h>
 30 
 31 #define DEVPTS_DEFAULT_MODE 0600
 32 /*
 33  * ptmx is a new node in /dev/pts and will be unused in legacy (single-
 34  * instance) mode. To prevent surprises in user space, set permissions of
 35  * ptmx to 0. Use 'chmod' or remount with '-o ptmxmode' to set meaningful
 36  * permissions.
 37  */
 38 #define DEVPTS_DEFAULT_PTMX_MODE 0000
 39 #define PTMX_MINOR      2
 40 
 41 /*
 42  * sysctl support for setting limits on the number of Unix98 ptys allocated.
 43  * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
 44  */
 45 static int pty_limit = NR_UNIX98_PTY_DEFAULT;
 46 static int pty_reserve = NR_UNIX98_PTY_RESERVE;
 47 static int pty_limit_min;
 48 static int pty_limit_max = INT_MAX;
 49 static int pty_count;
 50 
 51 static struct ctl_table pty_table[] = {
 52         {
 53                 .procname       = "max",
 54                 .maxlen         = sizeof(int),
 55                 .mode           = 0644,
 56                 .data           = &pty_limit,
 57                 .proc_handler   = proc_dointvec_minmax,
 58                 .extra1         = &pty_limit_min,
 59                 .extra2         = &pty_limit_max,
 60         }, {
 61                 .procname       = "reserve",
 62                 .maxlen         = sizeof(int),
 63                 .mode           = 0644,
 64                 .data           = &pty_reserve,
 65                 .proc_handler   = proc_dointvec_minmax,
 66                 .extra1         = &pty_limit_min,
 67                 .extra2         = &pty_limit_max,
 68         }, {
 69                 .procname       = "nr",
 70                 .maxlen         = sizeof(int),
 71                 .mode           = 0444,
 72                 .data           = &pty_count,
 73                 .proc_handler   = proc_dointvec,
 74         },
 75         {}
 76 };
 77 
 78 static struct ctl_table pty_kern_table[] = {
 79         {
 80                 .procname       = "pty",
 81                 .mode           = 0555,
 82                 .child          = pty_table,
 83         },
 84         {}
 85 };
 86 
 87 static struct ctl_table pty_root_table[] = {
 88         {
 89                 .procname       = "kernel",
 90                 .mode           = 0555,
 91                 .child          = pty_kern_table,
 92         },
 93         {}
 94 };
 95 
 96 static DEFINE_MUTEX(allocated_ptys_lock);
 97 
 98 struct pts_mount_opts {
 99         int setuid;
100         int setgid;
101         kuid_t   uid;
102         kgid_t   gid;
103         umode_t mode;
104         umode_t ptmxmode;
105         int reserve;
106         int max;
107 };
108 
109 enum {
110         Opt_uid, Opt_gid, Opt_mode, Opt_ptmxmode, Opt_newinstance,  Opt_max,
111         Opt_err
112 };
113 
114 static const match_table_t tokens = {
115         {Opt_uid, "uid=%u"},
116         {Opt_gid, "gid=%u"},
117         {Opt_mode, "mode=%o"},
118         {Opt_ptmxmode, "ptmxmode=%o"},
119         {Opt_newinstance, "newinstance"},
120         {Opt_max, "max=%d"},
121         {Opt_err, NULL}
122 };
123 
124 struct pts_fs_info {
125         struct ida allocated_ptys;
126         struct pts_mount_opts mount_opts;
127         struct super_block *sb;
128         struct dentry *ptmx_dentry;
129 };
130 
131 static inline struct pts_fs_info *DEVPTS_SB(struct super_block *sb)
132 {
133         return sb->s_fs_info;
134 }
135 
136 static int devpts_ptmx_path(struct path *path)
137 {
138         struct super_block *sb;
139         int err;
140 
141         /* Is a devpts filesystem at "pts" in the same directory? */
142         err = path_pts(path);
143         if (err)
144                 return err;
145 
146         /* Is the path the root of a devpts filesystem? */
147         sb = path->mnt->mnt_sb;
148         if ((sb->s_magic != DEVPTS_SUPER_MAGIC) ||
149             (path->mnt->mnt_root != sb->s_root))
150                 return -ENODEV;
151 
152         return 0;
153 }
154 
155 /*
156  * Try to find a suitable devpts filesystem. We support the following
157  * scenarios:
158  * - The ptmx device node is located in the same directory as the devpts
159  *   mount where the pts device nodes are located.
160  *   This is e.g. the case when calling open on the /dev/pts/ptmx device
161  *   node when the devpts filesystem is mounted at /dev/pts.
162  * - The ptmx device node is located outside the devpts filesystem mount
163  *   where the pts device nodes are located. For example, the ptmx device
164  *   is a symlink, separate device node, or bind-mount.
165  *   A supported scenario is bind-mounting /dev/pts/ptmx to /dev/ptmx and
166  *   then calling open on /dev/ptmx. In this case a suitable pts
167  *   subdirectory can be found in the common parent directory /dev of the
168  *   devpts mount and the ptmx bind-mount, after resolving the /dev/ptmx
169  *   bind-mount.
170  *   If no suitable pts subdirectory can be found this function will fail.
171  *   This is e.g. the case when bind-mounting /dev/pts/ptmx to /ptmx.
172  */
173 struct vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)
174 {
175         struct path path;
176         int err = 0;
177 
178         path = filp->f_path;
179         path_get(&path);
180 
181         /* Walk upward while the start point is a bind mount of
182          * a single file.
183          */
184         while (path.mnt->mnt_root == path.dentry)
185                 if (follow_up(&path) == 0)
186                         break;
187 
188         /* devpts_ptmx_path() finds a devpts fs or returns an error. */
189         if ((path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC) ||
190             (DEVPTS_SB(path.mnt->mnt_sb) != fsi))
191                 err = devpts_ptmx_path(&path);
192         dput(path.dentry);
193         if (!err) {
194                 if (DEVPTS_SB(path.mnt->mnt_sb) == fsi)
195                         return path.mnt;
196 
197                 err = -ENODEV;
198         }
199 
200         mntput(path.mnt);
201         return ERR_PTR(err);
202 }
203 
204 struct pts_fs_info *devpts_acquire(struct file *filp)
205 {
206         struct pts_fs_info *result;
207         struct path path;
208         struct super_block *sb;
209 
210         path = filp->f_path;
211         path_get(&path);
212 
213         /* Has the devpts filesystem already been found? */
214         if (path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC) {
215                 int err;
216 
217                 err = devpts_ptmx_path(&path);
218                 if (err) {
219                         result = ERR_PTR(err);
220                         goto out;
221                 }
222         }
223 
224         /*
225          * pty code needs to hold extra references in case of last /dev/tty close
226          */
227         sb = path.mnt->mnt_sb;
228         atomic_inc(&sb->s_active);
229         result = DEVPTS_SB(sb);
230 
231 out:
232         path_put(&path);
233         return result;
234 }
235 
236 void devpts_release(struct pts_fs_info *fsi)
237 {
238         deactivate_super(fsi->sb);
239 }
240 
241 #define PARSE_MOUNT     0
242 #define PARSE_REMOUNT   1
243 
244 /*
245  * parse_mount_options():
246  *      Set @opts to mount options specified in @data. If an option is not
247  *      specified in @data, set it to its default value.
248  *
249  * Note: @data may be NULL (in which case all options are set to default).
250  */
251 static int parse_mount_options(char *data, int op, struct pts_mount_opts *opts)
252 {
253         char *p;
254         kuid_t uid;
255         kgid_t gid;
256 
257         opts->setuid  = 0;
258         opts->setgid  = 0;
259         opts->uid     = GLOBAL_ROOT_UID;
260         opts->gid     = GLOBAL_ROOT_GID;
261         opts->mode    = DEVPTS_DEFAULT_MODE;
262         opts->ptmxmode = DEVPTS_DEFAULT_PTMX_MODE;
263         opts->max     = NR_UNIX98_PTY_MAX;
264 
265         /* Only allow instances mounted from the initial mount
266          * namespace to tap the reserve pool of ptys.
267          */
268         if (op == PARSE_MOUNT)
269                 opts->reserve =
270                         (current->nsproxy->mnt_ns == init_task.nsproxy->mnt_ns);
271 
272         while ((p = strsep(&data, ",")) != NULL) {
273                 substring_t args[MAX_OPT_ARGS];
274                 int token;
275                 int option;
276 
277                 if (!*p)
278                         continue;
279 
280                 token = match_token(p, tokens, args);
281                 switch (token) {
282                 case Opt_uid:
283                         if (match_int(&args[0], &option))
284                                 return -EINVAL;
285                         uid = make_kuid(current_user_ns(), option);
286                         if (!uid_valid(uid))
287                                 return -EINVAL;
288                         opts->uid = uid;
289                         opts->setuid = 1;
290                         break;
291                 case Opt_gid:
292                         if (match_int(&args[0], &option))
293                                 return -EINVAL;
294                         gid = make_kgid(current_user_ns(), option);
295                         if (!gid_valid(gid))
296                                 return -EINVAL;
297                         opts->gid = gid;
298                         opts->setgid = 1;
299                         break;
300                 case Opt_mode:
301                         if (match_octal(&args[0], &option))
302                                 return -EINVAL;
303                         opts->mode = option & S_IALLUGO;
304                         break;
305                 case Opt_ptmxmode:
306                         if (match_octal(&args[0], &option))
307                                 return -EINVAL;
308                         opts->ptmxmode = option & S_IALLUGO;
309                         break;
310                 case Opt_newinstance:
311                         break;
312                 case Opt_max:
313                         if (match_int(&args[0], &option) ||
314                             option < 0 || option > NR_UNIX98_PTY_MAX)
315                                 return -EINVAL;
316                         opts->max = option;
317                         break;
318                 default:
319                         pr_err("called with bogus options\n");
320                         return -EINVAL;
321                 }
322         }
323 
324         return 0;
325 }
326 
327 static int mknod_ptmx(struct super_block *sb)
328 {
329         int mode;
330         int rc = -ENOMEM;
331         struct dentry *dentry;
332         struct inode *inode;
333         struct dentry *root = sb->s_root;
334         struct pts_fs_info *fsi = DEVPTS_SB(sb);
335         struct pts_mount_opts *opts = &fsi->mount_opts;
336         kuid_t ptmx_uid = current_fsuid();
337         kgid_t ptmx_gid = current_fsgid();
338 
339         inode_lock(d_inode(root));
340 
341         /* If we have already created ptmx node, return */
342         if (fsi->ptmx_dentry) {
343                 rc = 0;
344                 goto out;
345         }
346 
347         dentry = d_alloc_name(root, "ptmx");
348         if (!dentry) {
349                 pr_err("Unable to alloc dentry for ptmx node\n");
350                 goto out;
351         }
352 
353         /*
354          * Create a new 'ptmx' node in this mount of devpts.
355          */
356         inode = new_inode(sb);
357         if (!inode) {
358                 pr_err("Unable to alloc inode for ptmx node\n");
359                 dput(dentry);
360                 goto out;
361         }
362 
363         inode->i_ino = 2;
364         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
365 
366         mode = S_IFCHR|opts->ptmxmode;
367         init_special_inode(inode, mode, MKDEV(TTYAUX_MAJOR, 2));
368         inode->i_uid = ptmx_uid;
369         inode->i_gid = ptmx_gid;
370 
371         d_add(dentry, inode);
372 
373         fsi->ptmx_dentry = dentry;
374         rc = 0;
375 out:
376         inode_unlock(d_inode(root));
377         return rc;
378 }
379 
380 static void update_ptmx_mode(struct pts_fs_info *fsi)
381 {
382         struct inode *inode;
383         if (fsi->ptmx_dentry) {
384                 inode = d_inode(fsi->ptmx_dentry);
385                 inode->i_mode = S_IFCHR|fsi->mount_opts.ptmxmode;
386         }
387 }
388 
389 static int devpts_remount(struct super_block *sb, int *flags, char *data)
390 {
391         int err;
392         struct pts_fs_info *fsi = DEVPTS_SB(sb);
393         struct pts_mount_opts *opts = &fsi->mount_opts;
394 
395         err = parse_mount_options(data, PARSE_REMOUNT, opts);
396 
397         /*
398          * parse_mount_options() restores options to default values
399          * before parsing and may have changed ptmxmode. So, update the
400          * mode in the inode too. Bogus options don't fail the remount,
401          * so do this even on error return.
402          */
403         update_ptmx_mode(fsi);
404 
405         return err;
406 }
407 
408 static int devpts_show_options(struct seq_file *seq, struct dentry *root)
409 {
410         struct pts_fs_info *fsi = DEVPTS_SB(root->d_sb);
411         struct pts_mount_opts *opts = &fsi->mount_opts;
412 
413         if (opts->setuid)
414                 seq_printf(seq, ",uid=%u",
415                            from_kuid_munged(&init_user_ns, opts->uid));
416         if (opts->setgid)
417                 seq_printf(seq, ",gid=%u",
418                            from_kgid_munged(&init_user_ns, opts->gid));
419         seq_printf(seq, ",mode=%03o", opts->mode);
420         seq_printf(seq, ",ptmxmode=%03o", opts->ptmxmode);
421         if (opts->max < NR_UNIX98_PTY_MAX)
422                 seq_printf(seq, ",max=%d", opts->max);
423 
424         return 0;
425 }
426 
427 static const struct super_operations devpts_sops = {
428         .statfs         = simple_statfs,
429         .remount_fs     = devpts_remount,
430         .show_options   = devpts_show_options,
431 };
432 
433 static void *new_pts_fs_info(struct super_block *sb)
434 {
435         struct pts_fs_info *fsi;
436 
437         fsi = kzalloc(sizeof(struct pts_fs_info), GFP_KERNEL);
438         if (!fsi)
439                 return NULL;
440 
441         ida_init(&fsi->allocated_ptys);
442         fsi->mount_opts.mode = DEVPTS_DEFAULT_MODE;
443         fsi->mount_opts.ptmxmode = DEVPTS_DEFAULT_PTMX_MODE;
444         fsi->sb = sb;
445 
446         return fsi;
447 }
448 
449 static int
450 devpts_fill_super(struct super_block *s, void *data, int silent)
451 {
452         struct inode *inode;
453         int error;
454 
455         s->s_iflags &= ~SB_I_NODEV;
456         s->s_blocksize = 1024;
457         s->s_blocksize_bits = 10;
458         s->s_magic = DEVPTS_SUPER_MAGIC;
459         s->s_op = &devpts_sops;
460         s->s_time_gran = 1;
461 
462         error = -ENOMEM;
463         s->s_fs_info = new_pts_fs_info(s);
464         if (!s->s_fs_info)
465                 goto fail;
466 
467         error = parse_mount_options(data, PARSE_MOUNT, &DEVPTS_SB(s)->mount_opts);
468         if (error)
469                 goto fail;
470 
471         error = -ENOMEM;
472         inode = new_inode(s);
473         if (!inode)
474                 goto fail;
475         inode->i_ino = 1;
476         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
477         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
478         inode->i_op = &simple_dir_inode_operations;
479         inode->i_fop = &simple_dir_operations;
480         set_nlink(inode, 2);
481 
482         s->s_root = d_make_root(inode);
483         if (!s->s_root) {
484                 pr_err("get root dentry failed\n");
485                 goto fail;
486         }
487 
488         error = mknod_ptmx(s);
489         if (error)
490                 goto fail_dput;
491 
492         return 0;
493 fail_dput:
494         dput(s->s_root);
495         s->s_root = NULL;
496 fail:
497         return error;
498 }
499 
500 /*
501  * devpts_mount()
502  *
503  *     Mount a new (private) instance of devpts.  PTYs created in this
504  *     instance are independent of the PTYs in other devpts instances.
505  */
506 static struct dentry *devpts_mount(struct file_system_type *fs_type,
507         int flags, const char *dev_name, void *data)
508 {
509         return mount_nodev(fs_type, flags, data, devpts_fill_super);
510 }
511 
512 static void devpts_kill_sb(struct super_block *sb)
513 {
514         struct pts_fs_info *fsi = DEVPTS_SB(sb);
515 
516         if (fsi)
517                 ida_destroy(&fsi->allocated_ptys);
518         kfree(fsi);
519         kill_litter_super(sb);
520 }
521 
522 static struct file_system_type devpts_fs_type = {
523         .name           = "devpts",
524         .mount          = devpts_mount,
525         .kill_sb        = devpts_kill_sb,
526         .fs_flags       = FS_USERNS_MOUNT,
527 };
528 
529 /*
530  * The normal naming convention is simply /dev/pts/<number>; this conforms
531  * to the System V naming convention
532  */
533 
534 int devpts_new_index(struct pts_fs_info *fsi)
535 {
536         int index;
537         int ida_ret;
538 
539 retry:
540         if (!ida_pre_get(&fsi->allocated_ptys, GFP_KERNEL))
541                 return -ENOMEM;
542 
543         mutex_lock(&allocated_ptys_lock);
544         if (pty_count >= (pty_limit -
545                           (fsi->mount_opts.reserve ? 0 : pty_reserve))) {
546                 mutex_unlock(&allocated_ptys_lock);
547                 return -ENOSPC;
548         }
549 
550         ida_ret = ida_get_new(&fsi->allocated_ptys, &index);
551         if (ida_ret < 0) {
552                 mutex_unlock(&allocated_ptys_lock);
553                 if (ida_ret == -EAGAIN)
554                         goto retry;
555                 return -EIO;
556         }
557 
558         if (index >= fsi->mount_opts.max) {
559                 ida_remove(&fsi->allocated_ptys, index);
560                 mutex_unlock(&allocated_ptys_lock);
561                 return -ENOSPC;
562         }
563         pty_count++;
564         mutex_unlock(&allocated_ptys_lock);
565         return index;
566 }
567 
568 void devpts_kill_index(struct pts_fs_info *fsi, int idx)
569 {
570         mutex_lock(&allocated_ptys_lock);
571         ida_remove(&fsi->allocated_ptys, idx);
572         pty_count--;
573         mutex_unlock(&allocated_ptys_lock);
574 }
575 
576 /**
577  * devpts_pty_new -- create a new inode in /dev/pts/
578  * @ptmx_inode: inode of the master
579  * @device: major+minor of the node to be created
580  * @index: used as a name of the node
581  * @priv: what's given back by devpts_get_priv
582  *
583  * The created inode is returned. Remove it from /dev/pts/ by devpts_pty_kill.
584  */
585 struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
586 {
587         struct dentry *dentry;
588         struct super_block *sb = fsi->sb;
589         struct inode *inode;
590         struct dentry *root;
591         struct pts_mount_opts *opts;
592         char s[12];
593 
594         root = sb->s_root;
595         opts = &fsi->mount_opts;
596 
597         inode = new_inode(sb);
598         if (!inode)
599                 return ERR_PTR(-ENOMEM);
600 
601         inode->i_ino = index + 3;
602         inode->i_uid = opts->setuid ? opts->uid : current_fsuid();
603         inode->i_gid = opts->setgid ? opts->gid : current_fsgid();
604         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
605         init_special_inode(inode, S_IFCHR|opts->mode, MKDEV(UNIX98_PTY_SLAVE_MAJOR, index));
606 
607         sprintf(s, "%d", index);
608 
609         dentry = d_alloc_name(root, s);
610         if (dentry) {
611                 dentry->d_fsdata = priv;
612                 d_add(dentry, inode);
613                 fsnotify_create(d_inode(root), dentry);
614         } else {
615                 iput(inode);
616                 dentry = ERR_PTR(-ENOMEM);
617         }
618 
619         return dentry;
620 }
621 
622 /**
623  * devpts_get_priv -- get private data for a slave
624  * @pts_inode: inode of the slave
625  *
626  * Returns whatever was passed as priv in devpts_pty_new for a given inode.
627  */
628 void *devpts_get_priv(struct dentry *dentry)
629 {
630         if (dentry->d_sb->s_magic != DEVPTS_SUPER_MAGIC)
631                 return NULL;
632         return dentry->d_fsdata;
633 }
634 
635 /**
636  * devpts_pty_kill -- remove inode form /dev/pts/
637  * @inode: inode of the slave to be removed
638  *
639  * This is an inverse operation of devpts_pty_new.
640  */
641 void devpts_pty_kill(struct dentry *dentry)
642 {
643         WARN_ON_ONCE(dentry->d_sb->s_magic != DEVPTS_SUPER_MAGIC);
644 
645         dentry->d_fsdata = NULL;
646         drop_nlink(dentry->d_inode);
647         d_delete(dentry);
648         dput(dentry);   /* d_alloc_name() in devpts_pty_new() */
649 }
650 
651 static int __init init_devpts_fs(void)
652 {
653         int err = register_filesystem(&devpts_fs_type);
654         if (!err) {
655                 register_sysctl_table(pty_root_table);
656         }
657         return err;
658 }
659 module_init(init_devpts_fs)
660 

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