fs/binfmt_misc.c

   1 /*
   2  *  binfmt_misc.c
   3  *
   4  *  Copyright (C) 1997 Richard Günther
   5  *
   6  *  binfmt_misc detects binaries via a magic or filename extension and invokes
   7  *  a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
   8  *  binfmt_mz.
   9  *
  10  *  1997-04-25 first version
  11  *  [...]
  12  *  1997-05-19 cleanup
  13  *  1997-06-26 hpa: pass the real filename rather than argv[0]
  14  *  1997-06-30 minor cleanup
  15  *  1997-08-09 removed extension stripping, locking cleanup
  16  *  2001-02-28 AV: rewritten into something that resembles C. Original didn't.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21
  22 #include <linux/binfmts.h>
  23 #include <linux/slab.h>
  24 #include <linux/ctype.h>
  25 #include <linux/file.h>
  26 #include <linux/pagemap.h>
  27 #include <linux/namei.h>
  28 #include <linux/mount.h>
  29 #include <linux/syscalls.h>
  30
  31 #include <asm/uaccess.h>
  32
  33 enum {
  34         VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */
  35 };
  36
  37 static LIST_HEAD(entries);
  38 static int enabled = 1;
  39
  40 enum {Enabled, Magic};
  41 #define MISC_FMT_PRESERVE_ARGV0 (1<<31)
  42 #define MISC_FMT_OPEN_BINARY (1<<30)
  43 #define MISC_FMT_CREDENTIALS (1<<29)
  44
  45 typedef struct {
  46         struct list_head list;
  47         unsigned long flags;            /* type, status, etc. */
  48         int offset;                     /* offset of magic */
  49         int size;                       /* size of magic/mask */
  50         char *magic;                    /* magic or filename extension */
  51         char *mask;                     /* mask, NULL for exact match */
  52         char *interpreter;              /* filename of interpreter */
  53         char *name;
  54         struct dentry *dentry;
  55 } Node;
  56
  57 static DEFINE_RWLOCK(entries_lock);
  58 static struct file_system_type bm_fs_type;
  59 static struct vfsmount *bm_mnt;
  60 static int entry_count;
  61
  62 /*
  63  * Check if we support the binfmt
  64  * if we do, return the node, else NULL
  65  * locking is done in load_misc_binary
  66  */
  67 static Node *check_file(struct linux_binprm *bprm)
  68 {
  69         char *p = strrchr(bprm->interp, '.');
  70         struct list_head *l;
  71
  72         list_for_each(l, &entries) {
  73                 Node *e = list_entry(l, Node, list);
  74                 char *s;
  75                 int j;
  76
  77                 if (!test_bit(Enabled, &e->flags))
  78                         continue;
  79
  80                 if (!test_bit(Magic, &e->flags)) {
  81                         if (p && !strcmp(e->magic, p + 1))
  82                                 return e;
  83                         continue;
  84                 }
  85
  86                 s = bprm->buf + e->offset;
  87                 if (e->mask) {
  88                         for (j = 0; j < e->size; j++)
  89                                 if ((*s++ ^ e->magic[j]) & e->mask[j])
  90                                         break;
  91                 } else {
  92                         for (j = 0; j < e->size; j++)
  93                                 if ((*s++ ^ e->magic[j]))
  94                                         break;
  95                 }
  96                 if (j == e->size)
  97                         return e;
  98         }
  99         return NULL;
 100 }
 101
 102 /*
 103  * the loader itself
 104  */
 105 static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
 106 {
 107         Node *fmt;
 108         struct file * interp_file = NULL;
 109         char iname[BINPRM_BUF_SIZE];
 110         char *iname_addr = iname;
 111         int retval;
 112         int fd_binary = -1;
 113         struct files_struct *files = NULL;
 114
 115         retval = -ENOEXEC;
 116         if (!enabled)
 117                 goto _ret;
 118
 119         /* to keep locking time low, we copy the interpreter string */
 120         read_lock(&entries_lock);
 121         fmt = check_file(bprm);
 122         if (fmt)
 123                 strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE);
 124         read_unlock(&entries_lock);
 125         if (!fmt)
 126                 goto _ret;
 127
 128         if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
 129                 remove_arg_zero(bprm);
 130         }
 131
 132         if (fmt->flags & MISC_FMT_OPEN_BINARY) {
 133
 134                 files = current->files;
 135                 retval = unshare_files();
 136                 if (retval < 0)
 137                         goto _ret;
 138                 if (files == current->files) {
 139                         put_files_struct(files);
 140                         files = NULL;
 141                 }
 142                 /* if the binary should be opened on behalf of the
 143                  * interpreter than keep it open and assign descriptor
 144                  * to it */
 145                 fd_binary = get_unused_fd();
 146                 if (fd_binary < 0) {
 147                         retval = fd_binary;
 148                         goto _unshare;
 149                 }
 150                 fd_install(fd_binary, bprm->file);
 151
 152                 /* if the binary is not readable than enforce mm->dumpable=0
 153                    regardless of the interpreter's permissions */
 154                 if (file_permission(bprm->file, MAY_READ))
 155                         bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
 156
 157                 allow_write_access(bprm->file);
 158                 bprm->file = NULL;
 159
 160                 /* mark the bprm that fd should be passed to interp */
 161                 bprm->interp_flags |= BINPRM_FLAGS_EXECFD;
 162                 bprm->interp_data = fd_binary;
 163
 164         } else {
 165                 allow_write_access(bprm->file);
 166                 fput(bprm->file);
 167                 bprm->file = NULL;
 168         }
 169         /* make argv[1] be the path to the binary */
 170         retval = copy_strings_kernel (1, &bprm->interp, bprm);
 171         if (retval < 0)
 172                 goto _error;
 173         bprm->argc++;
 174
 175         /* add the interp as argv[0] */
 176         retval = copy_strings_kernel (1, &iname_addr, bprm);
 177         if (retval < 0)
 178                 goto _error;
 179         bprm->argc ++;
 180
 181         bprm->interp = iname;   /* for binfmt_script */
 182
 183         interp_file = open_exec (iname);
 184         retval = PTR_ERR (interp_file);
 185         if (IS_ERR (interp_file))
 186                 goto _error;
 187
 188         bprm->file = interp_file;
 189         if (fmt->flags & MISC_FMT_CREDENTIALS) {
 190                 /*
 191                  * No need to call prepare_binprm(), it's already been
 192                  * done.  bprm->buf is stale, update from interp_file.
 193                  */
 194                 memset(bprm->buf, 0, BINPRM_BUF_SIZE);
 195                 retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
 196         } else
 197                 retval = prepare_binprm (bprm);
 198
 199         if (retval < 0)
 200                 goto _error;
 201
 202         retval = search_binary_handler (bprm, regs);
 203         if (retval < 0)
 204                 goto _error;
 205
 206         if (files) {
 207                 steal_locks(files);
 208                 put_files_struct(files);
 209                 files = NULL;
 210         }
 211 _ret:
 212         return retval;
 213 _error:
 214         if (fd_binary > 0)
 215                 sys_close(fd_binary);
 216         bprm->interp_flags = 0;
 217         bprm->interp_data = 0;
 218 _unshare:
 219         if (files) {
 220                 put_files_struct(current->files);
 221                 current->files = files;
 222         }
 223         goto _ret;
 224 }
 225
 226 /* Command parsers */
 227
 228 /*
 229  * parses and copies one argument enclosed in del from *sp to *dp,
 230  * recognising the \x special.
 231  * returns pointer to the copied argument or NULL in case of an
 232  * error (and sets err) or null argument length.
 233  */
 234 static char *scanarg(char *s, char del)
 235 {
 236         char c;
 237
 238         while ((c = *s++) != del) {
 239                 if (c == '\\' && *s == 'x') {
 240                         s++;
 241                         if (!isxdigit(*s++))
 242                                 return NULL;
 243                         if (!isxdigit(*s++))
 244                                 return NULL;
 245                 }
 246         }
 247         return s;
 248 }
 249
 250 static int unquote(char *from)
 251 {
 252         char c = 0, *s = from, *p = from;
 253
 254         while ((c = *s++) != '\0') {
 255                 if (c == '\\' && *s == 'x') {
 256                         s++;
 257                         c = toupper(*s++);
 258                         *p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4;
 259                         c = toupper(*s++);
 260                         *p++ |= c - (isdigit(c) ? '0' : 'A' - 10);
 261                         continue;
 262                 }
 263                 *p++ = c;
 264         }
 265         return p - from;
 266 }
 267
 268 static char * check_special_flags (char * sfs, Node * e)
 269 {
 270         char * p = sfs;
 271         int cont = 1;
 272
 273         /* special flags */
 274         while (cont) {
 275                 switch (*p) {
 276                         case 'P':
 277                                 p++;
 278                                 e->flags |= MISC_FMT_PRESERVE_ARGV0;
 279                                 break;
 280                         case 'O':
 281                                 p++;
 282                                 e->flags |= MISC_FMT_OPEN_BINARY;
 283                                 break;
 284                         case 'C':
 285                                 p++;
 286                                 /* this flags also implies the
 287                                    open-binary flag */
 288                                 e->flags |= (MISC_FMT_CREDENTIALS |
 289                                                 MISC_FMT_OPEN_BINARY);
 290                                 break;
 291                         default:
 292                                 cont = 0;
 293                 }
 294         }
 295
 296         return p;
 297 }
 298 /*
 299  * This registers a new binary format, it recognises the syntax
 300  * ':name:type:offset:magic:mask:interpreter:flags'
 301  * where the ':' is the IFS, that can be chosen with the first char
 302  */
 303 static Node *create_entry(const char __user *buffer, size_t count)
 304 {
 305         Node *e;
 306         int memsize, err;
 307         char *buf, *p;
 308         char del;
 309
 310         /* some sanity checks */
 311         err = -EINVAL;
 312         if ((count < 11) || (count > 256))
 313                 goto out;
 314
 315         err = -ENOMEM;
 316         memsize = sizeof(Node) + count + 8;
 317         e = (Node *) kmalloc(memsize, GFP_USER);
 318         if (!e)
 319                 goto out;
 320
 321         p = buf = (char *)e + sizeof(Node);
 322
 323         memset(e, 0, sizeof(Node));
 324         if (copy_from_user(buf, buffer, count))
 325                 goto Efault;
 326
 327         del = *p++;     /* delimeter */
 328
 329         memset(buf+count, del, 8);
 330
 331         e->name = p;
 332         p = strchr(p, del);
 333         if (!p)
 334                 goto Einval;
 335         *p++ = '\0';
 336         if (!e->name[0] ||
 337             !strcmp(e->name, ".") ||
 338             !strcmp(e->name, "..") ||
 339             strchr(e->name, '/'))
 340                 goto Einval;
 341         switch (*p++) {
 342                 case 'E': e->flags = 1<<Enabled; break;
 343                 case 'M': e->flags = (1<<Enabled) | (1<<Magic); break;
 344                 default: goto Einval;
 345         }
 346         if (*p++ != del)
 347                 goto Einval;
 348         if (test_bit(Magic, &e->flags)) {
 349                 char *s = strchr(p, del);
 350                 if (!s)
 351                         goto Einval;
 352                 *s++ = '\0';
 353                 e->offset = simple_strtoul(p, &p, 10);
 354                 if (*p++)
 355                         goto Einval;
 356                 e->magic = p;
 357                 p = scanarg(p, del);
 358                 if (!p)
 359                         goto Einval;
 360                 p[-1] = '\0';
 361                 if (!e->magic[0])
 362                         goto Einval;
 363                 e->mask = p;
 364                 p = scanarg(p, del);
 365                 if (!p)
 366                         goto Einval;
 367                 p[-1] = '\0';
 368                 if (!e->mask[0])
 369                         e->mask = NULL;
 370                 e->size = unquote(e->magic);
 371                 if (e->mask && unquote(e->mask) != e->size)
 372                         goto Einval;
 373                 if (e->size + e->offset > BINPRM_BUF_SIZE)
 374                         goto Einval;
 375         } else {
 376                 p = strchr(p, del);
 377                 if (!p)
 378                         goto Einval;
 379                 *p++ = '\0';
 380                 e->magic = p;
 381                 p = strchr(p, del);
 382                 if (!p)
 383                         goto Einval;
 384                 *p++ = '\0';
 385                 if (!e->magic[0] || strchr(e->magic, '/'))
 386                         goto Einval;
 387                 p = strchr(p, del);
 388                 if (!p)
 389                         goto Einval;
 390                 *p++ = '\0';
 391         }
 392         e->interpreter = p;
 393         p = strchr(p, del);
 394         if (!p)
 395                 goto Einval;
 396         *p++ = '\0';
 397         if (!e->interpreter[0])
 398                 goto Einval;
 399
 400
 401         p = check_special_flags (p, e);
 402
 403         if (*p == '\n')
 404                 p++;
 405         if (p != buf + count)
 406                 goto Einval;
 407         return e;
 408
 409 out:
 410         return ERR_PTR(err);
 411
 412 Efault:
 413         kfree(e);
 414         return ERR_PTR(-EFAULT);
 415 Einval:
 416         kfree(e);
 417         return ERR_PTR(-EINVAL);
 418 }
 419
 420 /*
 421  * Set status of entry/binfmt_misc:
 422  * '1' enables, '0' disables and '-1' clears entry/binfmt_misc
 423  */
 424 static int parse_command(const char __user *buffer, size_t count)
 425 {
 426         char s[4];
 427
 428         if (!count)
 429                 return 0;
 430         if (count > 3)
 431                 return -EINVAL;
 432         if (copy_from_user(s, buffer, count))
 433                 return -EFAULT;
 434         if (s[count-1] == '\n')
 435                 count--;
 436         if (count == 1 && s[0] == '0')
 437                 return 1;
 438         if (count == 1 && s[0] == '1')
 439                 return 2;
 440         if (count == 2 && s[0] == '-' && s[1] == '1')
 441                 return 3;
 442         return -EINVAL;
 443 }
 444
 445 /* generic stuff */
 446
 447 static void entry_status(Node *e, char *page)
 448 {
 449         char *dp;
 450         char *status = "disabled";
 451         const char * flags = "flags: ";
 452
 453         if (test_bit(Enabled, &e->flags))
 454                 status = "enabled";
 455
 456         if (!VERBOSE_STATUS) {
 457                 sprintf(page, "%s\n", status);
 458                 return;
 459         }
 460
 461         sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter);
 462         dp = page + strlen(page);
 463
 464         /* print the special flags */
 465         sprintf (dp, "%s", flags);
 466         dp += strlen (flags);
 467         if (e->flags & MISC_FMT_PRESERVE_ARGV0) {
 468                 *dp ++ = 'P';
 469         }
 470         if (e->flags & MISC_FMT_OPEN_BINARY) {
 471                 *dp ++ = 'O';
 472         }
 473         if (e->flags & MISC_FMT_CREDENTIALS) {
 474                 *dp ++ = 'C';
 475         }
 476         *dp ++ = '\n';
 477
 478
 479         if (!test_bit(Magic, &e->flags)) {
 480                 sprintf(dp, "extension .%s\n", e->magic);
 481         } else {
 482                 int i;
 483
 484                 sprintf(dp, "offset %i\nmagic ", e->offset);
 485                 dp = page + strlen(page);
 486                 for (i = 0; i < e->size; i++) {
 487                         sprintf(dp, "%02x", 0xff & (int) (e->magic[i]));
 488                         dp += 2;
 489                 }
 490                 if (e->mask) {
 491                         sprintf(dp, "\nmask ");
 492                         dp += 6;
 493                         for (i = 0; i < e->size; i++) {
 494                                 sprintf(dp, "%02x", 0xff & (int) (e->mask[i]));
 495                                 dp += 2;
 496                         }
 497                 }
 498                 *dp++ = '\n';
 499                 *dp = '\0';
 500         }
 501 }
 502
 503 static struct inode *bm_get_inode(struct super_block *sb, int mode)
 504 {
 505         struct inode * inode = new_inode(sb);
 506
 507         if (inode) {
 508                 inode->i_mode = mode;
 509                 inode->i_uid = 0;
 510                 inode->i_gid = 0;
 511                 inode->i_blksize = PAGE_CACHE_SIZE;
 512                 inode->i_blocks = 0;
 513                 inode->i_atime = inode->i_mtime = inode->i_ctime =
 514                         current_fs_time(inode->i_sb);
 515         }
 516         return inode;
 517 }
 518
 519 static void bm_clear_inode(struct inode *inode)
 520 {
 521         kfree(inode->u.generic_ip);
 522 }
 523
 524 static void kill_node(Node *e)
 525 {
 526         struct dentry *dentry;
 527
 528         write_lock(&entries_lock);
 529         dentry = e->dentry;
 530         if (dentry) {
 531                 list_del_init(&e->list);
 532                 e->dentry = NULL;
 533         }
 534         write_unlock(&entries_lock);
 535
 536         if (dentry) {
 537                 dentry->d_inode->i_nlink--;
 538                 d_drop(dentry);
 539                 dput(dentry);
 540                 simple_release_fs(&bm_mnt, &entry_count);
 541         }
 542 }
 543
 544 /* /<entry> */
 545
 546 static ssize_t
 547 bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
 548 {
 549         Node *e = file->f_dentry->d_inode->u.generic_ip;
 550         loff_t pos = *ppos;
 551         ssize_t res;
 552         char *page;
 553         int len;
 554
 555         if (!(page = (char*) __get_free_page(GFP_KERNEL)))
 556                 return -ENOMEM;
 557
 558         entry_status(e, page);
 559         len = strlen(page);
 560
 561         res = -EINVAL;
 562         if (pos < 0)
 563                 goto out;
 564         res = 0;
 565         if (pos >= len)
 566                 goto out;
 567         if (len < pos + nbytes)
 568                 nbytes = len - pos;
 569         res = -EFAULT;
 570         if (copy_to_user(buf, page + pos, nbytes))
 571                 goto out;
 572         *ppos = pos + nbytes;
 573         res = nbytes;
 574 out:
 575         free_page((unsigned long) page);
 576         return res;
 577 }
 578
 579 static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
 580                                 size_t count, loff_t *ppos)
 581 {
 582         struct dentry *root;
 583         Node *e = file->f_dentry->d_inode->u.generic_ip;
 584         int res = parse_command(buffer, count);
 585
 586         switch (res) {
 587                 case 1: clear_bit(Enabled, &e->flags);
 588                         break;
 589                 case 2: set_bit(Enabled, &e->flags);
 590                         break;
 591                 case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
 592                         mutex_lock(&root->d_inode->i_mutex);
 593
 594                         kill_node(e);
 595
 596                         mutex_unlock(&root->d_inode->i_mutex);
 597                         dput(root);
 598                         break;
 599                 default: return res;
 600         }
 601         return count;
 602 }
 603
 604 static const struct file_operations bm_entry_operations = {
 605         .read           = bm_entry_read,
 606         .write          = bm_entry_write,
 607 };
 608
 609 /* /register */
 610
 611 static ssize_t bm_register_write(struct file *file, const char __user *buffer,
 612                                size_t count, loff_t *ppos)
 613 {
 614         Node *e;
 615         struct inode *inode;
 616         struct dentry *root, *dentry;
 617         struct super_block *sb = file->f_vfsmnt->mnt_sb;
 618         int err = 0;
 619
 620         e = create_entry(buffer, count);
 621
 622         if (IS_ERR(e))
 623                 return PTR_ERR(e);
 624
 625         root = dget(sb->s_root);
 626         mutex_lock(&root->d_inode->i_mutex);
 627         dentry = lookup_one_len(e->name, root, strlen(e->name));
 628         err = PTR_ERR(dentry);
 629         if (IS_ERR(dentry))
 630                 goto out;
 631
 632         err = -EEXIST;
 633         if (dentry->d_inode)
 634                 goto out2;
 635
 636         inode = bm_get_inode(sb, S_IFREG | 0644);
 637
 638         err = -ENOMEM;
 639         if (!inode)
 640                 goto out2;
 641
 642         err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count);
 643         if (err) {
 644                 iput(inode);
 645                 inode = NULL;
 646                 goto out2;
 647         }
 648
 649         e->dentry = dget(dentry);
 650         inode->u.generic_ip = e;
 651         inode->i_fop = &bm_entry_operations;
 652
 653         d_instantiate(dentry, inode);
 654         write_lock(&entries_lock);
 655         list_add(&e->list, &entries);
 656         write_unlock(&entries_lock);
 657
 658         err = 0;
 659 out2:
 660         dput(dentry);
 661 out:
 662         mutex_unlock(&root->d_inode->i_mutex);
 663         dput(root);
 664
 665         if (err) {
 666                 kfree(e);
 667                 return -EINVAL;
 668         }
 669         return count;
 670 }
 671
 672 static const struct file_operations bm_register_operations = {
 673         .write          = bm_register_write,
 674 };
 675
 676 /* /status */
 677
 678 static ssize_t
 679 bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 680 {
 681         char *s = enabled ? "enabled" : "disabled";
 682         int len = strlen(s);
 683         loff_t pos = *ppos;
 684
 685         if (pos < 0)
 686                 return -EINVAL;
 687         if (pos >= len)
 688                 return 0;
 689         if (len < pos + nbytes)
 690                 nbytes = len - pos;
 691         if (copy_to_user(buf, s + pos, nbytes))
 692                 return -EFAULT;
 693         *ppos = pos + nbytes;
 694         return nbytes;
 695 }
 696
 697 static ssize_t bm_status_write(struct file * file, const char __user * buffer,
 698                 size_t count, loff_t *ppos)
 699 {
 700         int res = parse_command(buffer, count);
 701         struct dentry *root;
 702
 703         switch (res) {
 704                 case 1: enabled = 0; break;
 705                 case 2: enabled = 1; break;
 706                 case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
 707                         mutex_lock(&root->d_inode->i_mutex);
 708
 709                         while (!list_empty(&entries))
 710                                 kill_node(list_entry(entries.next, Node, list));
 711
 712                         mutex_unlock(&root->d_inode->i_mutex);
 713                         dput(root);
 714                 default: return res;
 715         }
 716         return count;
 717 }
 718
 719 static const struct file_operations bm_status_operations = {
 720         .read           = bm_status_read,
 721         .write          = bm_status_write,
 722 };
 723
 724 /* Superblock handling */
 725
 726 static struct super_operations s_ops = {
 727         .statfs         = simple_statfs,
 728         .clear_inode    = bm_clear_inode,
 729 };
 730
 731 static int bm_fill_super(struct super_block * sb, void * data, int silent)
 732 {
 733         static struct tree_descr bm_files[] = {
 734                 [1] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO},
 735                 [2] = {"register", &bm_register_operations, S_IWUSR},
 736                 /* last one */ {""}
 737         };
 738         int err = simple_fill_super(sb, 0x42494e4d, bm_files);
 739         if (!err)
 740                 sb->s_op = &s_ops;
 741         return err;
 742 }
 743
 744 static struct super_block *bm_get_sb(struct file_system_type *fs_type,
 745         int flags, const char *dev_name, void *data)
 746 {
 747         return get_sb_single(fs_type, flags, data, bm_fill_super);
 748 }
 749
 750 static struct linux_binfmt misc_format = {
 751         .module = THIS_MODULE,
 752         .load_binary = load_misc_binary,
 753 };
 754
 755 static struct file_system_type bm_fs_type = {
 756         .owner          = THIS_MODULE,
 757         .name           = "binfmt_misc",
 758         .get_sb         = bm_get_sb,
 759         .kill_sb        = kill_litter_super,
 760 };
 761
 762 static int __init init_misc_binfmt(void)
 763 {
 764         int err = register_filesystem(&bm_fs_type);
 765         if (!err) {
 766                 err = register_binfmt(&misc_format);
 767                 if (err)
 768                         unregister_filesystem(&bm_fs_type);
 769         }
 770         return err;
 771 }
 772
 773 static void __exit exit_misc_binfmt(void)
 774 {
 775         unregister_binfmt(&misc_format);
 776         unregister_filesystem(&bm_fs_type);
 777 }
 778
 779 core_initcall(init_misc_binfmt);
 780 module_exit(exit_misc_binfmt);
 781 MODULE_LICENSE("GPL");