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1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/linkage.h>
19 #include <linux/compat.h>
20 #include <linux/errno.h>
21 #include <linux/time.h>
22 #include <linux/fs.h>
23 #include <linux/fcntl.h>
24 #include <linux/namei.h>
25 #include <linux/file.h>
26 #include <linux/vfs.h>
27 #include <linux/ioctl32.h>
28 #include <linux/ioctl.h>
29 #include <linux/init.h>
30 #include <linux/sockios.h> /* for SIOCDEVPRIVATE */
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/smp_lock.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/nfsd/nfsd.h>
44 #include <linux/nfsd/syscall.h>
45 #include <linux/personality.h>
46 #include <linux/rwsem.h>
47 #include <linux/tsacct_kern.h>
48 #include <linux/highmem.h>
49 #include <linux/mm.h>
50
51 #include <net/sock.h> /* siocdevprivate_ioctl */
52
53 #include <asm/uaccess.h>
54 #include <asm/mmu_context.h>
55 #include <asm/ioctls.h>
56 #include "internal.h"
57
58 int compat_log = 1;
59
60 int compat_printk(const char *fmt, ...)
61 {
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70 }
71
72 #include "read_write.h"
73
74 /*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
79 {
80 struct timeval tv[2];
81
82 if (t) {
83 if (get_user(tv[0].tv_sec, &t->actime) ||
84 get_user(tv[1].tv_sec, &t->modtime))
85 return -EFAULT;
86 tv[0].tv_usec = 0;
87 tv[1].tv_usec = 0;
88 }
89 return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
90 }
91
92 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
93 {
94 struct timeval tv[2];
95
96 if (t) {
97 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
98 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
99 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
100 get_user(tv[1].tv_usec, &t[1].tv_usec))
101 return -EFAULT;
102 }
103 return do_utimes(dfd, filename, t ? tv : NULL);
104 }
105
106 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
107 {
108 return compat_sys_futimesat(AT_FDCWD, filename, t);
109 }
110
111 asmlinkage long compat_sys_newstat(char __user * filename,
112 struct compat_stat __user *statbuf)
113 {
114 struct kstat stat;
115 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
116
117 if (!error)
118 error = cp_compat_stat(&stat, statbuf);
119 return error;
120 }
121
122 asmlinkage long compat_sys_newlstat(char __user * filename,
123 struct compat_stat __user *statbuf)
124 {
125 struct kstat stat;
126 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
127
128 if (!error)
129 error = cp_compat_stat(&stat, statbuf);
130 return error;
131 }
132
133 #ifndef __ARCH_WANT_STAT64
134 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
135 struct compat_stat __user *statbuf, int flag)
136 {
137 struct kstat stat;
138 int error = -EINVAL;
139
140 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
141 goto out;
142
143 if (flag & AT_SYMLINK_NOFOLLOW)
144 error = vfs_lstat_fd(dfd, filename, &stat);
145 else
146 error = vfs_stat_fd(dfd, filename, &stat);
147
148 if (!error)
149 error = cp_compat_stat(&stat, statbuf);
150
151 out:
152 return error;
153 }
154 #endif
155
156 asmlinkage long compat_sys_newfstat(unsigned int fd,
157 struct compat_stat __user * statbuf)
158 {
159 struct kstat stat;
160 int error = vfs_fstat(fd, &stat);
161
162 if (!error)
163 error = cp_compat_stat(&stat, statbuf);
164 return error;
165 }
166
167 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
168 {
169
170 if (sizeof ubuf->f_blocks == 4) {
171 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
172 0xffffffff00000000ULL)
173 return -EOVERFLOW;
174 /* f_files and f_ffree may be -1; it's okay
175 * to stuff that into 32 bits */
176 if (kbuf->f_files != 0xffffffffffffffffULL
177 && (kbuf->f_files & 0xffffffff00000000ULL))
178 return -EOVERFLOW;
179 if (kbuf->f_ffree != 0xffffffffffffffffULL
180 && (kbuf->f_ffree & 0xffffffff00000000ULL))
181 return -EOVERFLOW;
182 }
183 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
184 __put_user(kbuf->f_type, &ubuf->f_type) ||
185 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
186 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
187 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
188 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
189 __put_user(kbuf->f_files, &ubuf->f_files) ||
190 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
191 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
192 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
193 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
194 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
195 __put_user(0, &ubuf->f_spare[0]) ||
196 __put_user(0, &ubuf->f_spare[1]) ||
197 __put_user(0, &ubuf->f_spare[2]) ||
198 __put_user(0, &ubuf->f_spare[3]) ||
199 __put_user(0, &ubuf->f_spare[4]))
200 return -EFAULT;
201 return 0;
202 }
203
204 /*
205 * The following statfs calls are copies of code from fs/open.c and
206 * should be checked against those from time to time
207 */
208 asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
209 {
210 struct nameidata nd;
211 int error;
212
213 error = user_path_walk(path, &nd);
214 if (!error) {
215 struct kstatfs tmp;
216 error = vfs_statfs(nd.dentry, &tmp);
217 if (!error)
218 error = put_compat_statfs(buf, &tmp);
219 path_release(&nd);
220 }
221 return error;
222 }
223
224 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
225 {
226 struct file * file;
227 struct kstatfs tmp;
228 int error;
229
230 error = -EBADF;
231 file = fget(fd);
232 if (!file)
233 goto out;
234 error = vfs_statfs(file->f_dentry, &tmp);
235 if (!error)
236 error = put_compat_statfs(buf, &tmp);
237 fput(file);
238 out:
239 return error;
240 }
241
242 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
243 {
244 if (sizeof ubuf->f_blocks == 4) {
245 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
246 0xffffffff00000000ULL)
247 return -EOVERFLOW;
248 /* f_files and f_ffree may be -1; it's okay
249 * to stuff that into 32 bits */
250 if (kbuf->f_files != 0xffffffffffffffffULL
251 && (kbuf->f_files & 0xffffffff00000000ULL))
252 return -EOVERFLOW;
253 if (kbuf->f_ffree != 0xffffffffffffffffULL
254 && (kbuf->f_ffree & 0xffffffff00000000ULL))
255 return -EOVERFLOW;
256 }
257 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
258 __put_user(kbuf->f_type, &ubuf->f_type) ||
259 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
260 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
261 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
262 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
263 __put_user(kbuf->f_files, &ubuf->f_files) ||
264 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
265 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
266 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
267 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
268 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
269 return -EFAULT;
270 return 0;
271 }
272
273 asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
274 {
275 struct nameidata nd;
276 int error;
277
278 if (sz != sizeof(*buf))
279 return -EINVAL;
280
281 error = user_path_walk(path, &nd);
282 if (!error) {
283 struct kstatfs tmp;
284 error = vfs_statfs(nd.dentry, &tmp);
285 if (!error)
286 error = put_compat_statfs64(buf, &tmp);
287 path_release(&nd);
288 }
289 return error;
290 }
291
292 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
293 {
294 struct file * file;
295 struct kstatfs tmp;
296 int error;
297
298 if (sz != sizeof(*buf))
299 return -EINVAL;
300
301 error = -EBADF;
302 file = fget(fd);
303 if (!file)
304 goto out;
305 error = vfs_statfs(file->f_dentry, &tmp);
306 if (!error)
307 error = put_compat_statfs64(buf, &tmp);
308 fput(file);
309 out:
310 return error;
311 }
312
313 /* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
314
315 #define IOCTL_HASHSIZE 256
316 static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
317
318 static inline unsigned long ioctl32_hash(unsigned long cmd)
319 {
320 return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
321 }
322
323 static void ioctl32_insert_translation(struct ioctl_trans *trans)
324 {
325 unsigned long hash;
326 struct ioctl_trans *t;
327
328 hash = ioctl32_hash (trans->cmd);
329 if (!ioctl32_hash_table[hash])
330 ioctl32_hash_table[hash] = trans;
331 else {
332 t = ioctl32_hash_table[hash];
333 while (t->next)
334 t = t->next;
335 trans->next = NULL;
336 t->next = trans;
337 }
338 }
339
340 static int __init init_sys32_ioctl(void)
341 {
342 int i;
343
344 for (i = 0; i < ioctl_table_size; i++) {
345 if (ioctl_start[i].next != 0) {
346 printk("ioctl translation %d bad\n",i);
347 return -1;
348 }
349
350 ioctl32_insert_translation(&ioctl_start[i]);
351 }
352 return 0;
353 }
354
355 __initcall(init_sys32_ioctl);
356
357 static void compat_ioctl_error(struct file *filp, unsigned int fd,
358 unsigned int cmd, unsigned long arg)
359 {
360 char buf[10];
361 char *fn = "?";
362 char *path;
363
364 /* find the name of the device. */
365 path = (char *)__get_free_page(GFP_KERNEL);
366 if (path) {
367 fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE);
368 if (IS_ERR(fn))
369 fn = "?";
370 }
371
372 sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
373 if (!isprint(buf[1]))
374 sprintf(buf, "%02x", buf[1]);
375 compat_printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
376 "cmd(%08x){%s} arg(%08x) on %s\n",
377 current->comm, current->pid,
378 (int)fd, (unsigned int)cmd, buf,
379 (unsigned int)arg, fn);
380
381 if (path)
382 free_page((unsigned long)path);
383 }
384
385 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
386 unsigned long arg)
387 {
388 struct file *filp;
389 int error = -EBADF;
390 struct ioctl_trans *t;
391 int fput_needed;
392
393 filp = fget_light(fd, &fput_needed);
394 if (!filp)
395 goto out;
396
397 /* RED-PEN how should LSM module know it's handling 32bit? */
398 error = security_file_ioctl(filp, cmd, arg);
399 if (error)
400 goto out_fput;
401
402 /*
403 * To allow the compat_ioctl handlers to be self contained
404 * we need to check the common ioctls here first.
405 * Just handle them with the standard handlers below.
406 */
407 switch (cmd) {
408 case FIOCLEX:
409 case FIONCLEX:
410 case FIONBIO:
411 case FIOASYNC:
412 case FIOQSIZE:
413 break;
414
415 case FIBMAP:
416 case FIGETBSZ:
417 case FIONREAD:
418 if (S_ISREG(filp->f_dentry->d_inode->i_mode))
419 break;
420 /*FALL THROUGH*/
421
422 default:
423 if (filp->f_op && filp->f_op->compat_ioctl) {
424 error = filp->f_op->compat_ioctl(filp, cmd, arg);
425 if (error != -ENOIOCTLCMD)
426 goto out_fput;
427 }
428
429 if (!filp->f_op ||
430 (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
431 goto do_ioctl;
432 break;
433 }
434
435 for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
436 if (t->cmd == cmd)
437 goto found_handler;
438 }
439
440 if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) &&
441 cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
442 error = siocdevprivate_ioctl(fd, cmd, arg);
443 } else {
444 static int count;
445
446 if (++count <= 50)
447 compat_ioctl_error(filp, fd, cmd, arg);
448 error = -EINVAL;
449 }
450
451 goto out_fput;
452
453 found_handler:
454 if (t->handler) {
455 lock_kernel();
456 error = t->handler(fd, cmd, arg, filp);
457 unlock_kernel();
458 goto out_fput;
459 }
460
461 do_ioctl:
462 error = vfs_ioctl(filp, fd, cmd, arg);
463 out_fput:
464 fput_light(filp, fput_needed);
465 out:
466 return error;
467 }
468
469 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
470 {
471 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
472 __get_user(kfl->l_type, &ufl->l_type) ||
473 __get_user(kfl->l_whence, &ufl->l_whence) ||
474 __get_user(kfl->l_start, &ufl->l_start) ||
475 __get_user(kfl->l_len, &ufl->l_len) ||
476 __get_user(kfl->l_pid, &ufl->l_pid))
477 return -EFAULT;
478 return 0;
479 }
480
481 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
482 {
483 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
484 __put_user(kfl->l_type, &ufl->l_type) ||
485 __put_user(kfl->l_whence, &ufl->l_whence) ||
486 __put_user(kfl->l_start, &ufl->l_start) ||
487 __put_user(kfl->l_len, &ufl->l_len) ||
488 __put_user(kfl->l_pid, &ufl->l_pid))
489 return -EFAULT;
490 return 0;
491 }
492
493 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
494 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
495 {
496 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
497 __get_user(kfl->l_type, &ufl->l_type) ||
498 __get_user(kfl->l_whence, &ufl->l_whence) ||
499 __get_user(kfl->l_start, &ufl->l_start) ||
500 __get_user(kfl->l_len, &ufl->l_len) ||
501 __get_user(kfl->l_pid, &ufl->l_pid))
502 return -EFAULT;
503 return 0;
504 }
505 #endif
506
507 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
508 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
509 {
510 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
511 __put_user(kfl->l_type, &ufl->l_type) ||
512 __put_user(kfl->l_whence, &ufl->l_whence) ||
513 __put_user(kfl->l_start, &ufl->l_start) ||
514 __put_user(kfl->l_len, &ufl->l_len) ||
515 __put_user(kfl->l_pid, &ufl->l_pid))
516 return -EFAULT;
517 return 0;
518 }
519 #endif
520
521 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
522 unsigned long arg)
523 {
524 mm_segment_t old_fs;
525 struct flock f;
526 long ret;
527
528 switch (cmd) {
529 case F_GETLK:
530 case F_SETLK:
531 case F_SETLKW:
532 ret = get_compat_flock(&f, compat_ptr(arg));
533 if (ret != 0)
534 break;
535 old_fs = get_fs();
536 set_fs(KERNEL_DS);
537 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
538 set_fs(old_fs);
539 if (cmd == F_GETLK && ret == 0) {
540 /* GETLK was successfule and we need to return the data...
541 * but it needs to fit in the compat structure.
542 * l_start shouldn't be too big, unless the original
543 * start + end is greater than COMPAT_OFF_T_MAX, in which
544 * case the app was asking for trouble, so we return
545 * -EOVERFLOW in that case.
546 * l_len could be too big, in which case we just truncate it,
547 * and only allow the app to see that part of the conflicting
548 * lock that might make sense to it anyway
549 */
550
551 if (f.l_start > COMPAT_OFF_T_MAX)
552 ret = -EOVERFLOW;
553 if (f.l_len > COMPAT_OFF_T_MAX)
554 f.l_len = COMPAT_OFF_T_MAX;
555 if (ret == 0)
556 ret = put_compat_flock(&f, compat_ptr(arg));
557 }
558 break;
559
560 case F_GETLK64:
561 case F_SETLK64:
562 case F_SETLKW64:
563 ret = get_compat_flock64(&f, compat_ptr(arg));
564 if (ret != 0)
565 break;
566 old_fs = get_fs();
567 set_fs(KERNEL_DS);
568 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
569 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
570 (unsigned long)&f);
571 set_fs(old_fs);
572 if (cmd == F_GETLK64 && ret == 0) {
573 /* need to return lock information - see above for commentary */
574 if (f.l_start > COMPAT_LOFF_T_MAX)
575 ret = -EOVERFLOW;
576 if (f.l_len > COMPAT_LOFF_T_MAX)
577 f.l_len = COMPAT_LOFF_T_MAX;
578 if (ret == 0)
579 ret = put_compat_flock64(&f, compat_ptr(arg));
580 }
581 break;
582
583 default:
584 ret = sys_fcntl(fd, cmd, arg);
585 break;
586 }
587 return ret;
588 }
589
590 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
591 unsigned long arg)
592 {
593 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
594 return -EINVAL;
595 return compat_sys_fcntl64(fd, cmd, arg);
596 }
597
598 asmlinkage long
599 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
600 {
601 long ret;
602 aio_context_t ctx64;
603
604 mm_segment_t oldfs = get_fs();
605 if (unlikely(get_user(ctx64, ctx32p)))
606 return -EFAULT;
607
608 set_fs(KERNEL_DS);
609 /* The __user pointer cast is valid because of the set_fs() */
610 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
611 set_fs(oldfs);
612 /* truncating is ok because it's a user address */
613 if (!ret)
614 ret = put_user((u32) ctx64, ctx32p);
615 return ret;
616 }
617
618 asmlinkage long
619 compat_sys_io_getevents(aio_context_t ctx_id,
620 unsigned long min_nr,
621 unsigned long nr,
622 struct io_event __user *events,
623 struct compat_timespec __user *timeout)
624 {
625 long ret;
626 struct timespec t;
627 struct timespec __user *ut = NULL;
628
629 ret = -EFAULT;
630 if (unlikely(!access_ok(VERIFY_WRITE, events,
631 nr * sizeof(struct io_event))))
632 goto out;
633 if (timeout) {
634 if (get_compat_timespec(&t, timeout))
635 goto out;
636
637 ut = compat_alloc_user_space(sizeof(*ut));
638 if (copy_to_user(ut, &t, sizeof(t)) )
639 goto out;
640 }
641 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
642 out:
643 return ret;
644 }
645
646 static inline long
647 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
648 {
649 compat_uptr_t uptr;
650 int i;
651
652 for (i = 0; i < nr; ++i) {
653 if (get_user(uptr, ptr32 + i))
654 return -EFAULT;
655 if (put_user(compat_ptr(uptr), ptr64 + i))
656 return -EFAULT;
657 }
658 return 0;
659 }
660
661 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
662
663 asmlinkage long
664 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
665 {
666 struct iocb __user * __user *iocb64;
667 long ret;
668
669 if (unlikely(nr < 0))
670 return -EINVAL;
671
672 if (nr > MAX_AIO_SUBMITS)
673 nr = MAX_AIO_SUBMITS;
674
675 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
676 ret = copy_iocb(nr, iocb, iocb64);
677 if (!ret)
678 ret = sys_io_submit(ctx_id, nr, iocb64);
679 return ret;
680 }
681
682 struct compat_ncp_mount_data {
683 compat_int_t version;
684 compat_uint_t ncp_fd;
685 __compat_uid_t mounted_uid;
686 compat_pid_t wdog_pid;
687 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
688 compat_uint_t time_out;
689 compat_uint_t retry_count;
690 compat_uint_t flags;
691 __compat_uid_t uid;
692 __compat_gid_t gid;
693 compat_mode_t file_mode;
694 compat_mode_t dir_mode;
695 };
696
697 struct compat_ncp_mount_data_v4 {
698 compat_int_t version;
699 compat_ulong_t flags;
700 compat_ulong_t mounted_uid;
701 compat_long_t wdog_pid;
702 compat_uint_t ncp_fd;
703 compat_uint_t time_out;
704 compat_uint_t retry_count;
705 compat_ulong_t uid;
706 compat_ulong_t gid;
707 compat_ulong_t file_mode;
708 compat_ulong_t dir_mode;
709 };
710
711 static void *do_ncp_super_data_conv(void *raw_data)
712 {
713 int version = *(unsigned int *)raw_data;
714
715 if (version == 3) {
716 struct compat_ncp_mount_data *c_n = raw_data;
717 struct ncp_mount_data *n = raw_data;
718
719 n->dir_mode = c_n->dir_mode;
720 n->file_mode = c_n->file_mode;
721 n->gid = c_n->gid;
722 n->uid = c_n->uid;
723 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
724 n->wdog_pid = c_n->wdog_pid;
725 n->mounted_uid = c_n->mounted_uid;
726 } else if (version == 4) {
727 struct compat_ncp_mount_data_v4 *c_n = raw_data;
728 struct ncp_mount_data_v4 *n = raw_data;
729
730 n->dir_mode = c_n->dir_mode;
731 n->file_mode = c_n->file_mode;
732 n->gid = c_n->gid;
733 n->uid = c_n->uid;
734 n->retry_count = c_n->retry_count;
735 n->time_out = c_n->time_out;
736 n->ncp_fd = c_n->ncp_fd;
737 n->wdog_pid = c_n->wdog_pid;
738 n->mounted_uid = c_n->mounted_uid;
739 n->flags = c_n->flags;
740 } else if (version != 5) {
741 return NULL;
742 }
743
744 return raw_data;
745 }
746
747 struct compat_smb_mount_data {
748 compat_int_t version;
749 __compat_uid_t mounted_uid;
750 __compat_uid_t uid;
751 __compat_gid_t gid;
752 compat_mode_t file_mode;
753 compat_mode_t dir_mode;
754 };
755
756 static void *do_smb_super_data_conv(void *raw_data)
757 {
758 struct smb_mount_data *s = raw_data;
759 struct compat_smb_mount_data *c_s = raw_data;
760
761 if (c_s->version != SMB_MOUNT_OLDVERSION)
762 goto out;
763 s->dir_mode = c_s->dir_mode;
764 s->file_mode = c_s->file_mode;
765 s->gid = c_s->gid;
766 s->uid = c_s->uid;
767 s->mounted_uid = c_s->mounted_uid;
768 out:
769 return raw_data;
770 }
771
772 struct compat_nfs_string {
773 compat_uint_t len;
774 compat_uptr_t data;
775 };
776
777 static inline void compat_nfs_string(struct nfs_string *dst,
778 struct compat_nfs_string *src)
779 {
780 dst->data = compat_ptr(src->data);
781 dst->len = src->len;
782 }
783
784 struct compat_nfs4_mount_data_v1 {
785 compat_int_t version;
786 compat_int_t flags;
787 compat_int_t rsize;
788 compat_int_t wsize;
789 compat_int_t timeo;
790 compat_int_t retrans;
791 compat_int_t acregmin;
792 compat_int_t acregmax;
793 compat_int_t acdirmin;
794 compat_int_t acdirmax;
795 struct compat_nfs_string client_addr;
796 struct compat_nfs_string mnt_path;
797 struct compat_nfs_string hostname;
798 compat_uint_t host_addrlen;
799 compat_uptr_t host_addr;
800 compat_int_t proto;
801 compat_int_t auth_flavourlen;
802 compat_uptr_t auth_flavours;
803 };
804
805 static int do_nfs4_super_data_conv(void *raw_data)
806 {
807 int version = *(compat_uint_t *) raw_data;
808
809 if (version == 1) {
810 struct compat_nfs4_mount_data_v1 *raw = raw_data;
811 struct nfs4_mount_data *real = raw_data;
812
813 /* copy the fields backwards */
814 real->auth_flavours = compat_ptr(raw->auth_flavours);
815 real->auth_flavourlen = raw->auth_flavourlen;
816 real->proto = raw->proto;
817 real->host_addr = compat_ptr(raw->host_addr);
818 real->host_addrlen = raw->host_addrlen;
819 compat_nfs_string(&real->hostname, &raw->hostname);
820 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
821 compat_nfs_string(&real->client_addr, &raw->client_addr);
822 real->acdirmax = raw->acdirmax;
823 real->acdirmin = raw->acdirmin;
824 real->acregmax = raw->acregmax;
825 real->acregmin = raw->acregmin;
826 real->retrans = raw->retrans;
827 real->timeo = raw->timeo;
828 real->wsize = raw->wsize;
829 real->rsize = raw->rsize;
830 real->flags = raw->flags;
831 real->version = raw->version;
832 }
833 else {
834 return -EINVAL;
835 }
836
837 return 0;
838 }
839
840 #define SMBFS_NAME "smbfs"
841 #define NCPFS_NAME "ncpfs"
842 #define NFS4_NAME "nfs4"
843
844 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
845 char __user * type, unsigned long flags,
846 void __user * data)
847 {
848 unsigned long type_page;
849 unsigned long data_page;
850 unsigned long dev_page;
851 char *dir_page;
852 int retval;
853
854 retval = copy_mount_options (type, &type_page);
855 if (retval < 0)
856 goto out;
857
858 dir_page = getname(dir_name);
859 retval = PTR_ERR(dir_page);
860 if (IS_ERR(dir_page))
861 goto out1;
862
863 retval = copy_mount_options (dev_name, &dev_page);
864 if (retval < 0)
865 goto out2;
866
867 retval = copy_mount_options (data, &data_page);
868 if (retval < 0)
869 goto out3;
870
871 retval = -EINVAL;
872
873 if (type_page) {
874 if (!strcmp((char *)type_page, SMBFS_NAME)) {
875 do_smb_super_data_conv((void *)data_page);
876 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
877 do_ncp_super_data_conv((void *)data_page);
878 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
879 if (do_nfs4_super_data_conv((void *) data_page))
880 goto out4;
881 }
882 }
883
884 lock_kernel();
885 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
886 flags, (void*)data_page);
887 unlock_kernel();
888
889 out4:
890 free_page(data_page);
891 out3:
892 free_page(dev_page);
893 out2:
894 putname(dir_page);
895 out1:
896 free_page(type_page);
897 out:
898 return retval;
899 }
900
901 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
902 #define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
903 ~(sizeof(compat_long_t)-1))
904
905 struct compat_old_linux_dirent {
906 compat_ulong_t d_ino;
907 compat_ulong_t d_offset;
908 unsigned short d_namlen;
909 char d_name[1];
910 };
911
912 struct compat_readdir_callback {
913 struct compat_old_linux_dirent __user *dirent;
914 int result;
915 };
916
917 static int compat_fillonedir(void *__buf, const char *name, int namlen,
918 loff_t offset, u64 ino, unsigned int d_type)
919 {
920 struct compat_readdir_callback *buf = __buf;
921 struct compat_old_linux_dirent __user *dirent;
922 compat_ulong_t d_ino;
923
924 if (buf->result)
925 return -EINVAL;
926 d_ino = ino;
927 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
928 return -EOVERFLOW;
929 buf->result++;
930 dirent = buf->dirent;
931 if (!access_ok(VERIFY_WRITE, dirent,
932 (unsigned long)(dirent->d_name + namlen + 1) -
933 (unsigned long)dirent))
934 goto efault;
935 if ( __put_user(d_ino, &dirent->d_ino) ||
936 __put_user(offset, &dirent->d_offset) ||
937 __put_user(namlen, &dirent->d_namlen) ||
938 __copy_to_user(dirent->d_name, name, namlen) ||
939 __put_user(0, dirent->d_name + namlen))
940 goto efault;
941 return 0;
942 efault:
943 buf->result = -EFAULT;
944 return -EFAULT;
945 }
946
947 asmlinkage long compat_sys_old_readdir(unsigned int fd,
948 struct compat_old_linux_dirent __user *dirent, unsigned int count)
949 {
950 int error;
951 struct file *file;
952 struct compat_readdir_callback buf;
953
954 error = -EBADF;
955 file = fget(fd);
956 if (!file)
957 goto out;
958
959 buf.result = 0;
960 buf.dirent = dirent;
961
962 error = vfs_readdir(file, compat_fillonedir, &buf);
963 if (error >= 0)
964 error = buf.result;
965
966 fput(file);
967 out:
968 return error;
969 }
970
971 struct compat_linux_dirent {
972 compat_ulong_t d_ino;
973 compat_ulong_t d_off;
974 unsigned short d_reclen;
975 char d_name[1];
976 };
977
978 struct compat_getdents_callback {
979 struct compat_linux_dirent __user *current_dir;
980 struct compat_linux_dirent __user *previous;
981 int count;
982 int error;
983 };
984
985 static int compat_filldir(void *__buf, const char *name, int namlen,
986 loff_t offset, u64 ino, unsigned int d_type)
987 {
988 struct compat_linux_dirent __user * dirent;
989 struct compat_getdents_callback *buf = __buf;
990 compat_ulong_t d_ino;
991 int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
992
993 buf->error = -EINVAL; /* only used if we fail.. */
994 if (reclen > buf->count)
995 return -EINVAL;
996 d_ino = ino;
997 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
998 return -EOVERFLOW;
999 dirent = buf->previous;
1000 if (dirent) {
1001 if (__put_user(offset, &dirent->d_off))
1002 goto efault;
1003 }
1004 dirent = buf->current_dir;
1005 if (__put_user(d_ino, &dirent->d_ino))
1006 goto efault;
1007 if (__put_user(reclen, &dirent->d_reclen))
1008 goto efault;
1009 if (copy_to_user(dirent->d_name, name, namlen))
1010 goto efault;
1011 if (__put_user(0, dirent->d_name + namlen))
1012 goto efault;
1013 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1014 goto efault;
1015 buf->previous = dirent;
1016 dirent = (void __user *)dirent + reclen;
1017 buf->current_dir = dirent;
1018 buf->count -= reclen;
1019 return 0;
1020 efault:
1021 buf->error = -EFAULT;
1022 return -EFAULT;
1023 }
1024
1025 asmlinkage long compat_sys_getdents(unsigned int fd,
1026 struct compat_linux_dirent __user *dirent, unsigned int count)
1027 {
1028 struct file * file;
1029 struct compat_linux_dirent __user * lastdirent;
1030 struct compat_getdents_callback buf;
1031 int error;
1032
1033 error = -EFAULT;
1034 if (!access_ok(VERIFY_WRITE, dirent, count))
1035 goto out;
1036
1037 error = -EBADF;
1038 file = fget(fd);
1039 if (!file)
1040 goto out;
1041
1042 buf.current_dir = dirent;
1043 buf.previous = NULL;
1044 buf.count = count;
1045 buf.error = 0;
1046
1047 error = vfs_readdir(file, compat_filldir, &buf);
1048 if (error < 0)
1049 goto out_putf;
1050 error = buf.error;
1051 lastdirent = buf.previous;
1052 if (lastdirent) {
1053 if (put_user(file->f_pos, &lastdirent->d_off))
1054 error = -EFAULT;
1055 else
1056 error = count - buf.count;
1057 }
1058
1059 out_putf:
1060 fput(file);
1061 out:
1062 return error;
1063 }
1064
1065 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1066 #define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
1067
1068 struct compat_getdents_callback64 {
1069 struct linux_dirent64 __user *current_dir;
1070 struct linux_dirent64 __user *previous;
1071 int count;
1072 int error;
1073 };
1074
1075 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1076 u64 ino, unsigned int d_type)
1077 {
1078 struct linux_dirent64 __user *dirent;
1079 struct compat_getdents_callback64 *buf = __buf;
1080 int jj = NAME_OFFSET(dirent);
1081 int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
1082 u64 off;
1083
1084 buf->error = -EINVAL; /* only used if we fail.. */
1085 if (reclen > buf->count)
1086 return -EINVAL;
1087 dirent = buf->previous;
1088
1089 if (dirent) {
1090 if (__put_user_unaligned(offset, &dirent->d_off))
1091 goto efault;
1092 }
1093 dirent = buf->current_dir;
1094 if (__put_user_unaligned(ino, &dirent->d_ino))
1095 goto efault;
1096 off = 0;
1097 if (__put_user_unaligned(off, &dirent->d_off))
1098 goto efault;
1099 if (__put_user(reclen, &dirent->d_reclen))
1100 goto efault;
1101 if (__put_user(d_type, &dirent->d_type))
1102 goto efault;
1103 if (copy_to_user(dirent->d_name, name, namlen))
1104 goto efault;
1105 if (__put_user(0, dirent->d_name + namlen))
1106 goto efault;
1107 buf->previous = dirent;
1108 dirent = (void __user *)dirent + reclen;
1109 buf->current_dir = dirent;
1110 buf->count -= reclen;
1111 return 0;
1112 efault:
1113 buf->error = -EFAULT;
1114 return -EFAULT;
1115 }
1116
1117 asmlinkage long compat_sys_getdents64(unsigned int fd,
1118 struct linux_dirent64 __user * dirent, unsigned int count)
1119 {
1120 struct file * file;
1121 struct linux_dirent64 __user * lastdirent;
1122 struct compat_getdents_callback64 buf;
1123 int error;
1124
1125 error = -EFAULT;
1126 if (!access_ok(VERIFY_WRITE, dirent, count))
1127 goto out;
1128
1129 error = -EBADF;
1130 file = fget(fd);
1131 if (!file)
1132 goto out;
1133
1134 buf.current_dir = dirent;
1135 buf.previous = NULL;
1136 buf.count = count;
1137 buf.error = 0;
1138
1139 error = vfs_readdir(file, compat_filldir64, &buf);
1140 if (error < 0)
1141 goto out_putf;
1142 error = buf.error;
1143 lastdirent = buf.previous;
1144 if (lastdirent) {
1145 typeof(lastdirent->d_off) d_off = file->f_pos;
1146 __put_user_unaligned(d_off, &lastdirent->d_off);
1147 error = count - buf.count;
1148 }
1149
1150 out_putf:
1151 fput(file);
1152 out:
1153 return error;
1154 }
1155 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1156
1157 static ssize_t compat_do_readv_writev(int type, struct file *file,
1158 const struct compat_iovec __user *uvector,
1159 unsigned long nr_segs, loff_t *pos)
1160 {
1161 compat_ssize_t tot_len;
1162 struct iovec iovstack[UIO_FASTIOV];
1163 struct iovec *iov=iovstack, *vector;
1164 ssize_t ret;
1165 int seg;
1166 io_fn_t fn;
1167 iov_fn_t fnv;
1168
1169 /*
1170 * SuS says "The readv() function *may* fail if the iovcnt argument
1171 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1172 * traditionally returned zero for zero segments, so...
1173 */
1174 ret = 0;
1175 if (nr_segs == 0)
1176 goto out;
1177
1178 /*
1179 * First get the "struct iovec" from user memory and
1180 * verify all the pointers
1181 */
1182 ret = -EINVAL;
1183 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1184 goto out;
1185 if (!file->f_op)
1186 goto out;
1187 if (nr_segs > UIO_FASTIOV) {
1188 ret = -ENOMEM;
1189 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1190 if (!iov)
1191 goto out;
1192 }
1193 ret = -EFAULT;
1194 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1195 goto out;
1196
1197 /*
1198 * Single unix specification:
1199 * We should -EINVAL if an element length is not >= 0 and fitting an
1200 * ssize_t. The total length is fitting an ssize_t
1201 *
1202 * Be careful here because iov_len is a size_t not an ssize_t
1203 */
1204 tot_len = 0;
1205 vector = iov;
1206 ret = -EINVAL;
1207 for (seg = 0 ; seg < nr_segs; seg++) {
1208 compat_ssize_t tmp = tot_len;
1209 compat_ssize_t len;
1210 compat_uptr_t buf;
1211
1212 if (__get_user(len, &uvector->iov_len) ||
1213 __get_user(buf, &uvector->iov_base)) {
1214 ret = -EFAULT;
1215 goto out;
1216 }
1217 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1218 goto out;
1219 tot_len += len;
1220 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1221 goto out;
1222 vector->iov_base = compat_ptr(buf);
1223 vector->iov_len = (compat_size_t) len;
1224 uvector++;
1225 vector++;
1226 }
1227 if (tot_len == 0) {
1228 ret = 0;
1229 goto out;
1230 }
1231
1232 ret = rw_verify_area(type, file, pos, tot_len);
1233 if (ret < 0)
1234 goto out;
1235
1236 ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
1237 if (ret)
1238 goto out;
1239
1240 fnv = NULL;
1241 if (type == READ) {
1242 fn = file->f_op->read;
1243 fnv = file->f_op->aio_read;
1244 } else {
1245 fn = (io_fn_t)file->f_op->write;
1246 fnv = file->f_op->aio_write;
1247 }
1248
1249 if (fnv)
1250 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1251 pos, fnv);
1252 else
1253 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1254
1255 out:
1256 if (iov != iovstack)
1257 kfree(iov);
1258 if ((ret + (type == READ)) > 0) {
1259 struct dentry *dentry = file->f_dentry;
1260 if (type == READ)
1261 fsnotify_access(dentry);
1262 else
1263 fsnotify_modify(dentry);
1264 }
1265 return ret;
1266 }
1267
1268 asmlinkage ssize_t
1269 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1270 {
1271 struct file *file;
1272 ssize_t ret = -EBADF;
1273
1274 file = fget(fd);
1275 if (!file)
1276 return -EBADF;
1277
1278 if (!(file->f_mode & FMODE_READ))
1279 goto out;
1280
1281 ret = -EINVAL;
1282 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1283 goto out;
1284
1285 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1286
1287 out:
1288 fput(file);
1289 return ret;
1290 }
1291
1292 asmlinkage ssize_t
1293 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1294 {
1295 struct file *file;
1296 ssize_t ret = -EBADF;
1297
1298 file = fget(fd);
1299 if (!file)
1300 return -EBADF;
1301 if (!(file->f_mode & FMODE_WRITE))
1302 goto out;
1303
1304 ret = -EINVAL;
1305 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1306 goto out;
1307
1308 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1309
1310 out:
1311 fput(file);
1312 return ret;
1313 }
1314
1315 asmlinkage long
1316 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1317 unsigned int nr_segs, unsigned int flags)
1318 {
1319 unsigned i;
1320 struct iovec __user *iov;
1321 if (nr_segs > UIO_MAXIOV)
1322 return -EINVAL;
1323 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1324 for (i = 0; i < nr_segs; i++) {
1325 struct compat_iovec v;
1326 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1327 get_user(v.iov_len, &iov32[i].iov_len) ||
1328 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1329 put_user(v.iov_len, &iov[i].iov_len))
1330 return -EFAULT;
1331 }
1332 return sys_vmsplice(fd, iov, nr_segs, flags);
1333 }
1334
1335 /*
1336 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1337 * O_LARGEFILE flag.
1338 */
1339 asmlinkage long
1340 compat_sys_open(const char __user *filename, int flags, int mode)
1341 {
1342 return do_sys_open(AT_FDCWD, filename, flags, mode);
1343 }
1344
1345 /*
1346 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1347 * O_LARGEFILE flag.
1348 */
1349 asmlinkage long
1350 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1351 {
1352 return do_sys_open(dfd, filename, flags, mode);
1353 }
1354
1355 /*
1356 * compat_count() counts the number of arguments/envelopes. It is basically
1357 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1358 * and envp pointers.
1359 */
1360 static int compat_count(compat_uptr_t __user *argv, int max)
1361 {
1362 int i = 0;
1363
1364 if (argv != NULL) {
1365 for (;;) {
1366 compat_uptr_t p;
1367
1368 if (get_user(p, argv))
1369 return -EFAULT;
1370 if (!p)
1371 break;
1372 argv++;
1373 if(++i > max)
1374 return -E2BIG;
1375 }
1376 }
1377 return i;
1378 }
1379
1380 /*
1381 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1382 * except that it works with 32 bit argv and envp pointers.
1383 */
1384 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1385 struct linux_binprm *bprm)
1386 {
1387 struct page *kmapped_page = NULL;
1388 char *kaddr = NULL;
1389 int ret;
1390
1391 while (argc-- > 0) {
1392 compat_uptr_t str;
1393 int len;
1394 unsigned long pos;
1395
1396 if (get_user(str, argv+argc) ||
1397 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1398 ret = -EFAULT;
1399 goto out;
1400 }
1401
1402 if (bprm->p < len) {
1403 ret = -E2BIG;
1404 goto out;
1405 }
1406
1407 bprm->p -= len;
1408 /* XXX: add architecture specific overflow check here. */
1409 pos = bprm->p;
1410
1411 while (len > 0) {
1412 int i, new, err;
1413 int offset, bytes_to_copy;
1414 struct page *page;
1415
1416 offset = pos % PAGE_SIZE;
1417 i = pos/PAGE_SIZE;
1418 page = bprm->page[i];
1419 new = 0;
1420 if (!page) {
1421 page = alloc_page(GFP_HIGHUSER);
1422 bprm->page[i] = page;
1423 if (!page) {
1424 ret = -ENOMEM;
1425 goto out;
1426 }
1427 new = 1;
1428 }
1429
1430 if (page != kmapped_page) {
1431 if (kmapped_page)
1432 kunmap(kmapped_page);
1433 kmapped_page = page;
1434 kaddr = kmap(kmapped_page);
1435 }
1436 if (new && offset)
1437 memset(kaddr, 0, offset);
1438 bytes_to_copy = PAGE_SIZE - offset;
1439 if (bytes_to_copy > len) {
1440 bytes_to_copy = len;
1441 if (new)
1442 memset(kaddr+offset+len, 0,
1443 PAGE_SIZE-offset-len);
1444 }
1445 err = copy_from_user(kaddr+offset, compat_ptr(str),
1446 bytes_to_copy);
1447 if (err) {
1448 ret = -EFAULT;
1449 goto out;
1450 }
1451
1452 pos += bytes_to_copy;
1453 str += bytes_to_copy;
1454 len -= bytes_to_copy;
1455 }
1456 }
1457 ret = 0;
1458 out:
1459 if (kmapped_page)
1460 kunmap(kmapped_page);
1461 return ret;
1462 }
1463
1464 #ifdef CONFIG_MMU
1465
1466 #define free_arg_pages(bprm) do { } while (0)
1467
1468 #else
1469
1470 static inline void free_arg_pages(struct linux_binprm *bprm)
1471 {
1472 int i;
1473
1474 for (i = 0; i < MAX_ARG_PAGES; i++) {
1475 if (bprm->page[i])
1476 __free_page(bprm->page[i]);
1477 bprm->page[i] = NULL;
1478 }
1479 }
1480
1481 #endif /* CONFIG_MMU */
1482
1483 /*
1484 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1485 * that it processes 32 bit argv and envp pointers.
1486 */
1487 int compat_do_execve(char * filename,
1488 compat_uptr_t __user *argv,
1489 compat_uptr_t __user *envp,
1490 struct pt_regs * regs)
1491 {
1492 struct linux_binprm *bprm;
1493 struct file *file;
1494 int retval;
1495 int i;
1496
1497 retval = -ENOMEM;
1498 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1499 if (!bprm)
1500 goto out_ret;
1501
1502 file = open_exec(filename);
1503 retval = PTR_ERR(file);
1504 if (IS_ERR(file))
1505 goto out_kfree;
1506
1507 sched_exec();
1508
1509 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1510 bprm->file = file;
1511 bprm->filename = filename;
1512 bprm->interp = filename;
1513 bprm->mm = mm_alloc();
1514 retval = -ENOMEM;
1515 if (!bprm->mm)
1516 goto out_file;
1517
1518 retval = init_new_context(current, bprm->mm);
1519 if (retval < 0)
1520 goto out_mm;
1521
1522 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1523 if ((retval = bprm->argc) < 0)
1524 goto out_mm;
1525
1526 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1527 if ((retval = bprm->envc) < 0)
1528 goto out_mm;
1529
1530 retval = security_bprm_alloc(bprm);
1531 if (retval)
1532 goto out;
1533
1534 retval = prepare_binprm(bprm);
1535 if (retval < 0)
1536 goto out;
1537
1538 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1539 if (retval < 0)
1540 goto out;
1541
1542 bprm->exec = bprm->p;
1543 retval = compat_copy_strings(bprm->envc, envp, bprm);
1544 if (retval < 0)
1545 goto out;
1546
1547 retval = compat_copy_strings(bprm->argc, argv, bprm);
1548 if (retval < 0)
1549 goto out;
1550
1551 retval = search_binary_handler(bprm, regs);
1552 if (retval >= 0) {
1553 free_arg_pages(bprm);
1554
1555 /* execve success */
1556 security_bprm_free(bprm);
1557 acct_update_integrals(current);
1558 kfree(bprm);
1559 return retval;
1560 }
1561
1562 out:
1563 /* Something went wrong, return the inode and free the argument pages*/
1564 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1565 struct page * page = bprm->page[i];
1566 if (page)
1567 __free_page(page);
1568 }
1569
1570 if (bprm->security)
1571 security_bprm_free(bprm);
1572
1573 out_mm:
1574 if (bprm->mm)
1575 mmdrop(bprm->mm);
1576
1577 out_file:
1578 if (bprm->file) {
1579 allow_write_access(bprm->file);
1580 fput(bprm->file);
1581 }
1582
1583 out_kfree:
1584 kfree(bprm);
1585
1586 out_ret:
1587 return retval;
1588 }
1589
1590 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1591
1592 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
1593
1594 /*
1595 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1596 * 64-bit unsigned longs.
1597 */
1598 static
1599 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1600 unsigned long *fdset)
1601 {
1602 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1603 if (ufdset) {
1604 unsigned long odd;
1605
1606 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1607 return -EFAULT;
1608
1609 odd = nr & 1UL;
1610 nr &= ~1UL;
1611 while (nr) {
1612 unsigned long h, l;
1613 __get_user(l, ufdset);
1614 __get_user(h, ufdset+1);
1615 ufdset += 2;
1616 *fdset++ = h << 32 | l;
1617 nr -= 2;
1618 }
1619 if (odd)
1620 __get_user(*fdset, ufdset);
1621 } else {
1622 /* Tricky, must clear full unsigned long in the
1623 * kernel fdset at the end, this makes sure that
1624 * actually happens.
1625 */
1626 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1627 }
1628 return 0;
1629 }
1630
1631 static
1632 void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1633 unsigned long *fdset)
1634 {
1635 unsigned long odd;
1636 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1637
1638 if (!ufdset)
1639 return;
1640
1641 odd = nr & 1UL;
1642 nr &= ~1UL;
1643 while (nr) {
1644 unsigned long h, l;
1645 l = *fdset++;
1646 h = l >> 32;
1647 __put_user(l, ufdset);
1648 __put_user(h, ufdset+1);
1649 ufdset += 2;
1650 nr -= 2;
1651 }
1652 if (odd)
1653 __put_user(*fdset, ufdset);
1654 }
1655
1656
1657 /*
1658 * This is a virtual copy of sys_select from fs/select.c and probably
1659 * should be compared to it from time to time
1660 */
1661
1662 /*
1663 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1664 * like to be certain this leads to no problems. So I return
1665 * EINTR just for safety.
1666 *
1667 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1668 * I'm trying ERESTARTNOHAND which restart only when you want to.
1669 */
1670 #define MAX_SELECT_SECONDS \
1671 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1672
1673 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1674 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1675 {
1676 fd_set_bits fds;
1677 char *bits;
1678 int size, max_fdset, ret = -EINVAL;
1679 struct fdtable *fdt;
1680
1681 if (n < 0)
1682 goto out_nofds;
1683
1684 /* max_fdset can increase, so grab it once to avoid race */
1685 rcu_read_lock();
1686 fdt = files_fdtable(current->files);
1687 max_fdset = fdt->max_fdset;
1688 rcu_read_unlock();
1689 if (n > max_fdset)
1690 n = max_fdset;
1691
1692 /*
1693 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1694 * since we used fdset we need to allocate memory in units of
1695 * long-words.
1696 */
1697 ret = -ENOMEM;
1698 size = FDS_BYTES(n);
1699 bits = kmalloc(6 * size, GFP_KERNEL);
1700 if (!bits)
1701 goto out_nofds;
1702 fds.in = (unsigned long *) bits;
1703 fds.out = (unsigned long *) (bits + size);
1704 fds.ex = (unsigned long *) (bits + 2*size);
1705 fds.res_in = (unsigned long *) (bits + 3*size);
1706 fds.res_out = (unsigned long *) (bits + 4*size);
1707 fds.res_ex = (unsigned long *) (bits + 5*size);
1708
1709 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1710 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1711 (ret = compat_get_fd_set(n, exp, fds.ex)))
1712 goto out;
1713 zero_fd_set(n, fds.res_in);
1714 zero_fd_set(n, fds.res_out);
1715 zero_fd_set(n, fds.res_ex);
1716
1717 ret = do_select(n, &fds, timeout);
1718
1719 if (ret < 0)
1720 goto out;
1721 if (!ret) {
1722 ret = -ERESTARTNOHAND;
1723 if (signal_pending(current))
1724 goto out;
1725 ret = 0;
1726 }
1727
1728 compat_set_fd_set(n, inp, fds.res_in);
1729 compat_set_fd_set(n, outp, fds.res_out);
1730 compat_set_fd_set(n, exp, fds.res_ex);
1731
1732 out:
1733 kfree(bits);
1734 out_nofds:
1735 return ret;
1736 }
1737
1738 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1739 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1740 struct compat_timeval __user *tvp)
1741 {
1742 s64 timeout = -1;
1743 struct compat_timeval tv;
1744 int ret;
1745
1746 if (tvp) {
1747 if (copy_from_user(&tv, tvp, sizeof(tv)))
1748 return -EFAULT;
1749
1750 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1751 return -EINVAL;
1752
1753 /* Cast to u64 to make GCC stop complaining */
1754 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1755 timeout = -1; /* infinite */
1756 else {
1757 timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
1758 timeout += tv.tv_sec * HZ;
1759 }
1760 }
1761
1762 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1763
1764 if (tvp) {
1765 struct compat_timeval rtv;
1766
1767 if (current->personality & STICKY_TIMEOUTS)
1768 goto sticky;
1769 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1770 rtv.tv_sec = timeout;
1771 if (compat_timeval_compare(&rtv, &tv) >= 0)
1772 rtv = tv;
1773 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1774 sticky:
1775 /*
1776 * If an application puts its timeval in read-only
1777 * memory, we don't want the Linux-specific update to
1778 * the timeval to cause a fault after the select has
1779 * completed successfully. However, because we're not
1780 * updating the timeval, we can't restart the system
1781 * call.
1782 */
1783 if (ret == -ERESTARTNOHAND)
1784 ret = -EINTR;
1785 }
1786 }
1787
1788 return ret;
1789 }
1790
1791 #ifdef TIF_RESTORE_SIGMASK
1792 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1793 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1794 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1795 compat_size_t sigsetsize)
1796 {
1797 compat_sigset_t ss32;
1798 sigset_t ksigmask, sigsaved;
1799 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1800 struct compat_timespec ts;
1801 int ret;
1802
1803 if (tsp) {
1804 if (copy_from_user(&ts, tsp, sizeof(ts)))
1805 return -EFAULT;
1806
1807 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1808 return -EINVAL;
1809 }
1810
1811 if (sigmask) {
1812 if (sigsetsize != sizeof(compat_sigset_t))
1813 return -EINVAL;
1814 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1815 return -EFAULT;
1816 sigset_from_compat(&ksigmask, &ss32);
1817
1818 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1819 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1820 }
1821
1822 do {
1823 if (tsp) {
1824 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1825 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1826 timeout += ts.tv_sec * (unsigned long)HZ;
1827 ts.tv_sec = 0;
1828 ts.tv_nsec = 0;
1829 } else {
1830 ts.tv_sec -= MAX_SELECT_SECONDS;
1831 timeout = MAX_SELECT_SECONDS * HZ;
1832 }
1833 }
1834
1835 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1836
1837 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1838
1839 if (tsp) {
1840 struct compat_timespec rts;
1841
1842 if (current->personality & STICKY_TIMEOUTS)
1843 goto sticky;
1844
1845 rts.tv_sec = timeout / HZ;
1846 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1847 if (rts.tv_nsec >= NSEC_PER_SEC) {
1848 rts.tv_sec++;
1849 rts.tv_nsec -= NSEC_PER_SEC;
1850 }
1851 if (compat_timespec_compare(&rts, &ts) >= 0)
1852 rts = ts;
1853 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1854 sticky:
1855 /*
1856 * If an application puts its timeval in read-only
1857 * memory, we don't want the Linux-specific update to
1858 * the timeval to cause a fault after the select has
1859 * completed successfully. However, because we're not
1860 * updating the timeval, we can't restart the system
1861 * call.
1862 */
1863 if (ret == -ERESTARTNOHAND)
1864 ret = -EINTR;
1865 }
1866 }
1867
1868 if (ret == -ERESTARTNOHAND) {
1869 /*
1870 * Don't restore the signal mask yet. Let do_signal() deliver
1871 * the signal on the way back to userspace, before the signal
1872 * mask is restored.
1873 */
1874 if (sigmask) {
1875 memcpy(&current->saved_sigmask, &sigsaved,
1876 sizeof(sigsaved));
1877 set_thread_flag(TIF_RESTORE_SIGMASK);
1878 }
1879 } else if (sigmask)
1880 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1881
1882 return ret;
1883 }
1884
1885 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1886 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1887 struct compat_timespec __user *tsp, void __user *sig)
1888 {
1889 compat_size_t sigsetsize = 0;
1890 compat_uptr_t up = 0;
1891
1892 if (sig) {
1893 if (!access_ok(VERIFY_READ, sig,
1894 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1895 __get_user(up, (compat_uptr_t __user *)sig) ||
1896 __get_user(sigsetsize,
1897 (compat_size_t __user *)(sig+sizeof(up))))
1898 return -EFAULT;
1899 }
1900 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1901 sigsetsize);
1902 }
1903
1904 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1905 unsigned int nfds, struct compat_timespec __user *tsp,
1906 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1907 {
1908 compat_sigset_t ss32;
1909 sigset_t ksigmask, sigsaved;
1910 struct compat_timespec ts;
1911 s64 timeout = -1;
1912 int ret;
1913
1914 if (tsp) {
1915 if (copy_from_user(&ts, tsp, sizeof(ts)))
1916 return -EFAULT;
1917
1918 /* We assume that ts.tv_sec is always lower than
1919 the number of seconds that can be expressed in
1920 an s64. Otherwise the compiler bitches at us */
1921 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1922 timeout += ts.tv_sec * HZ;
1923 }
1924
1925 if (sigmask) {
1926 if (sigsetsize != sizeof(compat_sigset_t))
1927 return -EINVAL;
1928 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1929 return -EFAULT;
1930 sigset_from_compat(&ksigmask, &ss32);
1931
1932 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1933 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1934 }
1935
1936 ret = do_sys_poll(ufds, nfds, &timeout);
1937
1938 /* We can restart this syscall, usually */
1939 if (ret == -EINTR) {
1940 /*
1941 * Don't restore the signal mask yet. Let do_signal() deliver
1942 * the signal on the way back to userspace, before the signal
1943 * mask is restored.
1944 */
1945 if (sigmask) {
1946 memcpy(&current->saved_sigmask, &sigsaved,
1947 sizeof(sigsaved));
1948 set_thread_flag(TIF_RESTORE_SIGMASK);
1949 }
1950 ret = -ERESTARTNOHAND;
1951 } else if (sigmask)
1952 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1953
1954 if (tsp && timeout >= 0) {
1955 struct compat_timespec rts;
1956
1957 if (current->personality & STICKY_TIMEOUTS)
1958 goto sticky;
1959 /* Yes, we know it's actually an s64, but it's also positive. */
1960 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1961 1000;
1962 rts.tv_sec = timeout;
1963 if (compat_timespec_compare(&rts, &ts) >= 0)
1964 rts = ts;
1965 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1966 sticky:
1967 /*
1968 * If an application puts its timeval in read-only
1969 * memory, we don't want the Linux-specific update to
1970 * the timeval to cause a fault after the select has
1971 * completed successfully. However, because we're not
1972 * updating the timeval, we can't restart the system
1973 * call.
1974 */
1975 if (ret == -ERESTARTNOHAND && timeout >= 0)
1976 ret = -EINTR;
1977 }
1978 }
1979
1980 return ret;
1981 }
1982 #endif /* TIF_RESTORE_SIGMASK */
1983
1984 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1985 /* Stuff for NFS server syscalls... */
1986 struct compat_nfsctl_svc {
1987 u16 svc32_port;
1988 s32 svc32_nthreads;
1989 };
1990
1991 struct compat_nfsctl_client {
1992 s8 cl32_ident[NFSCLNT_IDMAX+1];
1993 s32 cl32_naddr;
1994 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1995 s32 cl32_fhkeytype;
1996 s32 cl32_fhkeylen;
1997 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1998 };
1999
2000 struct compat_nfsctl_export {
2001 char ex32_client[NFSCLNT_IDMAX+1];
2002 char ex32_path[NFS_MAXPATHLEN+1];
2003 compat_dev_t ex32_dev;
2004 compat_ino_t ex32_ino;
2005 compat_int_t ex32_flags;
2006 __compat_uid_t ex32_anon_uid;
2007 __compat_gid_t ex32_anon_gid;
2008 };
2009
2010 struct compat_nfsctl_fdparm {
2011 struct sockaddr gd32_addr;
2012 s8 gd32_path[NFS_MAXPATHLEN+1];
2013 compat_int_t gd32_version;
2014 };
2015
2016 struct compat_nfsctl_fsparm {
2017 struct sockaddr gd32_addr;
2018 s8 gd32_path[NFS_MAXPATHLEN+1];
2019 compat_int_t gd32_maxlen;
2020 };
2021
2022 struct compat_nfsctl_arg {
2023 compat_int_t ca32_version; /* safeguard */
2024 union {
2025 struct compat_nfsctl_svc u32_svc;
2026 struct compat_nfsctl_client u32_client;
2027 struct compat_nfsctl_export u32_export;
2028 struct compat_nfsctl_fdparm u32_getfd;
2029 struct compat_nfsctl_fsparm u32_getfs;
2030 } u;
2031 #define ca32_svc u.u32_svc
2032 #define ca32_client u.u32_client
2033 #define ca32_export u.u32_export
2034 #define ca32_getfd u.u32_getfd
2035 #define ca32_getfs u.u32_getfs
2036 };
2037
2038 union compat_nfsctl_res {
2039 __u8 cr32_getfh[NFS_FHSIZE];
2040 struct knfsd_fh cr32_getfs;
2041 };
2042
2043 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2044 struct compat_nfsctl_arg __user *arg)
2045 {
2046 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2047 get_user(karg->ca_version, &arg->ca32_version) ||
2048 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2049 __get_user(karg->ca_svc.svc_nthreads,
2050 &arg->ca32_svc.svc32_nthreads))
2051 return -EFAULT;
2052 return 0;
2053 }
2054
2055 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2056 struct compat_nfsctl_arg __user *arg)
2057 {
2058 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2059 sizeof(arg->ca32_client)) ||
2060 get_user(karg->ca_version, &arg->ca32_version) ||
2061 __copy_from_user(&karg->ca_client.cl_ident[0],
2062 &arg->ca32_client.cl32_ident[0],
2063 NFSCLNT_IDMAX) ||
2064 __get_user(karg->ca_client.cl_naddr,
2065 &arg->ca32_client.cl32_naddr) ||
2066 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2067 &arg->ca32_client.cl32_addrlist[0],
2068 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2069 __get_user(karg->ca_client.cl_fhkeytype,
2070 &arg->ca32_client.cl32_fhkeytype) ||
2071 __get_user(karg->ca_client.cl_fhkeylen,
2072 &arg->ca32_client.cl32_fhkeylen) ||
2073 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2074 &arg->ca32_client.cl32_fhkey[0],
2075 NFSCLNT_KEYMAX))
2076 return -EFAULT;
2077
2078 return 0;
2079 }
2080
2081 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2082 struct compat_nfsctl_arg __user *arg)
2083 {
2084 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2085 sizeof(arg->ca32_export)) ||
2086 get_user(karg->ca_version, &arg->ca32_version) ||
2087 __copy_from_user(&karg->ca_export.ex_client[0],
2088 &arg->ca32_export.ex32_client[0],
2089 NFSCLNT_IDMAX) ||
2090 __copy_from_user(&karg->ca_export.ex_path[0],
2091 &arg->ca32_export.ex32_path[0],
2092 NFS_MAXPATHLEN) ||
2093 __get_user(karg->ca_export.ex_dev,
2094 &arg->ca32_export.ex32_dev) ||
2095 __get_user(karg->ca_export.ex_ino,
2096 &arg->ca32_export.ex32_ino) ||
2097 __get_user(karg->ca_export.ex_flags,
2098 &arg->ca32_export.ex32_flags) ||
2099 __get_user(karg->ca_export.ex_anon_uid,
2100 &arg->ca32_export.ex32_anon_uid) ||
2101 __get_user(karg->ca_export.ex_anon_gid,
2102 &arg->ca32_export.ex32_anon_gid))
2103 return -EFAULT;
2104 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2105 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2106
2107 return 0;
2108 }
2109
2110 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2111 struct compat_nfsctl_arg __user *arg)
2112 {
2113 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2114 sizeof(arg->ca32_getfd)) ||
2115 get_user(karg->ca_version, &arg->ca32_version) ||
2116 __copy_from_user(&karg->ca_getfd.gd_addr,
2117 &arg->ca32_getfd.gd32_addr,
2118 (sizeof(struct sockaddr))) ||
2119 __copy_from_user(&karg->ca_getfd.gd_path,
2120 &arg->ca32_getfd.gd32_path,
2121 (NFS_MAXPATHLEN+1)) ||
2122 __get_user(karg->ca_getfd.gd_version,
2123 &arg->ca32_getfd.gd32_version))
2124 return -EFAULT;
2125
2126 return 0;
2127 }
2128
2129 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2130 struct compat_nfsctl_arg __user *arg)
2131 {
2132 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2133 get_user(karg->ca_version, &arg->ca32_version) ||
2134 __copy_from_user(&karg->ca_getfs.gd_addr,
2135 &arg->ca32_getfs.gd32_addr,
2136 (sizeof(struct sockaddr))) ||
2137 __copy_from_user(&karg->ca_getfs.gd_path,
2138 &arg->ca32_getfs.gd32_path,
2139 (NFS_MAXPATHLEN+1)) ||
2140 __get_user(karg->ca_getfs.gd_maxlen,
2141 &arg->ca32_getfs.gd32_maxlen))
2142 return -EFAULT;
2143
2144 return 0;
2145 }
2146
2147 /* This really doesn't need translations, we are only passing
2148 * back a union which contains opaque nfs file handle data.
2149 */
2150 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2151 union compat_nfsctl_res __user *res)
2152 {
2153 int err;
2154
2155 err = copy_to_user(res, kres, sizeof(*res));
2156
2157 return (err) ? -EFAULT : 0;
2158 }
2159
2160 asmlinkage long compat_sys_nfsservctl(int cmd,
2161 struct compat_nfsctl_arg __user *arg,
2162 union compat_nfsctl_res __user *res)
2163 {
2164 struct nfsctl_arg *karg;
2165 union nfsctl_res *kres;
2166 mm_segment_t oldfs;
2167 int err;
2168
2169 karg = kmalloc(sizeof(*karg), GFP_USER);
2170 kres = kmalloc(sizeof(*kres), GFP_USER);
2171 if(!karg || !kres) {
2172 err = -ENOMEM;
2173 goto done;
2174 }
2175
2176 switch(cmd) {
2177 case NFSCTL_SVC:
2178 err = compat_nfs_svc_trans(karg, arg);
2179 break;
2180
2181 case NFSCTL_ADDCLIENT:
2182 err = compat_nfs_clnt_trans(karg, arg);
2183 break;
2184
2185 case NFSCTL_DELCLIENT:
2186 err = compat_nfs_clnt_trans(karg, arg);
2187 break;
2188
2189 case NFSCTL_EXPORT:
2190 case NFSCTL_UNEXPORT:
2191 err = compat_nfs_exp_trans(karg, arg);
2192 break;
2193
2194 case NFSCTL_GETFD:
2195 err = compat_nfs_getfd_trans(karg, arg);
2196 break;
2197
2198 case NFSCTL_GETFS:
2199 err = compat_nfs_getfs_trans(karg, arg);
2200 break;
2201
2202 default:
2203 err = -EINVAL;
2204 break;
2205 }
2206
2207 if (err)
2208 goto done;
2209
2210 oldfs = get_fs();
2211 set_fs(KERNEL_DS);
2212 /* The __user pointer casts are valid because of the set_fs() */
2213 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2214 set_fs(oldfs);
2215
2216 if (err)
2217 goto done;
2218
2219 if((cmd == NFSCTL_GETFD) ||
2220 (cmd == NFSCTL_GETFS))
2221 err = compat_nfs_getfh_res_trans(kres, res);
2222
2223 done:
2224 kfree(karg);
2225 kfree(kres);
2226 return err;
2227 }
2228 #else /* !NFSD */
2229 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2230 {
2231 return sys_ni_syscall();
2232 }
2233 #endif
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