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[PATCH] vmi: fix nohz compile
[linux-2.6/mini2440.git] / fs / compat.c
blob0ec70e3cee0a6113e24b9282250dbcb950e144f1
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/poll.h>
50 #include <linux/mm.h>
51
52 #include <net/sock.h> /* siocdevprivate_ioctl */
53
54 #include <asm/uaccess.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ioctls.h>
57 #include "internal.h"
58
59 int compat_log = 1;
60
61 int compat_printk(const char *fmt, ...)
62 {
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71 }
72
73 #include "read_write.h"
74
75 /*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
80 {
81 struct timeval tv[2];
82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
87 tv[0].tv_usec = 0;
88 tv[1].tv_usec = 0;
89 }
90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
91 }
92
93 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
94 {
95 struct timeval tv[2];
96
97 if (t) {
98 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
99 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
100 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
101 get_user(tv[1].tv_usec, &t[1].tv_usec))
102 return -EFAULT;
103 }
104 return do_utimes(dfd, filename, t ? tv : NULL);
105 }
106
107 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
108 {
109 return compat_sys_futimesat(AT_FDCWD, filename, t);
110 }
111
112 asmlinkage long compat_sys_newstat(char __user * filename,
113 struct compat_stat __user *statbuf)
114 {
115 struct kstat stat;
116 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
117
118 if (!error)
119 error = cp_compat_stat(&stat, statbuf);
120 return error;
121 }
122
123 asmlinkage long compat_sys_newlstat(char __user * filename,
124 struct compat_stat __user *statbuf)
125 {
126 struct kstat stat;
127 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
128
129 if (!error)
130 error = cp_compat_stat(&stat, statbuf);
131 return error;
132 }
133
134 #ifndef __ARCH_WANT_STAT64
135 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
136 struct compat_stat __user *statbuf, int flag)
137 {
138 struct kstat stat;
139 int error = -EINVAL;
140
141 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
142 goto out;
143
144 if (flag & AT_SYMLINK_NOFOLLOW)
145 error = vfs_lstat_fd(dfd, filename, &stat);
146 else
147 error = vfs_stat_fd(dfd, filename, &stat);
148
149 if (!error)
150 error = cp_compat_stat(&stat, statbuf);
151
152 out:
153 return error;
154 }
155 #endif
156
157 asmlinkage long compat_sys_newfstat(unsigned int fd,
158 struct compat_stat __user * statbuf)
159 {
160 struct kstat stat;
161 int error = vfs_fstat(fd, &stat);
162
163 if (!error)
164 error = cp_compat_stat(&stat, statbuf);
165 return error;
166 }
167
168 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
169 {
170
171 if (sizeof ubuf->f_blocks == 4) {
172 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
173 0xffffffff00000000ULL)
174 return -EOVERFLOW;
175 /* f_files and f_ffree may be -1; it's okay
176 * to stuff that into 32 bits */
177 if (kbuf->f_files != 0xffffffffffffffffULL
178 && (kbuf->f_files & 0xffffffff00000000ULL))
179 return -EOVERFLOW;
180 if (kbuf->f_ffree != 0xffffffffffffffffULL
181 && (kbuf->f_ffree & 0xffffffff00000000ULL))
182 return -EOVERFLOW;
183 }
184 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
185 __put_user(kbuf->f_type, &ubuf->f_type) ||
186 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
187 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
188 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
189 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
190 __put_user(kbuf->f_files, &ubuf->f_files) ||
191 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
192 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
193 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
194 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
195 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
196 __put_user(0, &ubuf->f_spare[0]) ||
197 __put_user(0, &ubuf->f_spare[1]) ||
198 __put_user(0, &ubuf->f_spare[2]) ||
199 __put_user(0, &ubuf->f_spare[3]) ||
200 __put_user(0, &ubuf->f_spare[4]))
201 return -EFAULT;
202 return 0;
203 }
204
205 /*
206 * The following statfs calls are copies of code from fs/open.c and
207 * should be checked against those from time to time
208 */
209 asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
210 {
211 struct nameidata nd;
212 int error;
213
214 error = user_path_walk(path, &nd);
215 if (!error) {
216 struct kstatfs tmp;
217 error = vfs_statfs(nd.dentry, &tmp);
218 if (!error)
219 error = put_compat_statfs(buf, &tmp);
220 path_release(&nd);
221 }
222 return error;
223 }
224
225 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
226 {
227 struct file * file;
228 struct kstatfs tmp;
229 int error;
230
231 error = -EBADF;
232 file = fget(fd);
233 if (!file)
234 goto out;
235 error = vfs_statfs(file->f_path.dentry, &tmp);
236 if (!error)
237 error = put_compat_statfs(buf, &tmp);
238 fput(file);
239 out:
240 return error;
241 }
242
243 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
244 {
245 if (sizeof ubuf->f_blocks == 4) {
246 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
247 0xffffffff00000000ULL)
248 return -EOVERFLOW;
249 /* f_files and f_ffree may be -1; it's okay
250 * to stuff that into 32 bits */
251 if (kbuf->f_files != 0xffffffffffffffffULL
252 && (kbuf->f_files & 0xffffffff00000000ULL))
253 return -EOVERFLOW;
254 if (kbuf->f_ffree != 0xffffffffffffffffULL
255 && (kbuf->f_ffree & 0xffffffff00000000ULL))
256 return -EOVERFLOW;
257 }
258 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
259 __put_user(kbuf->f_type, &ubuf->f_type) ||
260 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
261 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
262 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
263 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
264 __put_user(kbuf->f_files, &ubuf->f_files) ||
265 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
266 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
267 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
268 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
269 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
270 return -EFAULT;
271 return 0;
272 }
273
274 asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
275 {
276 struct nameidata nd;
277 int error;
278
279 if (sz != sizeof(*buf))
280 return -EINVAL;
281
282 error = user_path_walk(path, &nd);
283 if (!error) {
284 struct kstatfs tmp;
285 error = vfs_statfs(nd.dentry, &tmp);
286 if (!error)
287 error = put_compat_statfs64(buf, &tmp);
288 path_release(&nd);
289 }
290 return error;
291 }
292
293 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
294 {
295 struct file * file;
296 struct kstatfs tmp;
297 int error;
298
299 if (sz != sizeof(*buf))
300 return -EINVAL;
301
302 error = -EBADF;
303 file = fget(fd);
304 if (!file)
305 goto out;
306 error = vfs_statfs(file->f_path.dentry, &tmp);
307 if (!error)
308 error = put_compat_statfs64(buf, &tmp);
309 fput(file);
310 out:
311 return error;
312 }
313
314 /* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
315
316 #define IOCTL_HASHSIZE 256
317 static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
318
319 static inline unsigned long ioctl32_hash(unsigned long cmd)
320 {
321 return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
322 }
323
324 static void ioctl32_insert_translation(struct ioctl_trans *trans)
325 {
326 unsigned long hash;
327 struct ioctl_trans *t;
328
329 hash = ioctl32_hash (trans->cmd);
330 if (!ioctl32_hash_table[hash])
331 ioctl32_hash_table[hash] = trans;
332 else {
333 t = ioctl32_hash_table[hash];
334 while (t->next)
335 t = t->next;
336 trans->next = NULL;
337 t->next = trans;
338 }
339 }
340
341 static int __init init_sys32_ioctl(void)
342 {
343 int i;
344
345 for (i = 0; i < ioctl_table_size; i++) {
346 if (ioctl_start[i].next != 0) {
347 printk("ioctl translation %d bad\n",i);
348 return -1;
349 }
350
351 ioctl32_insert_translation(&ioctl_start[i]);
352 }
353 return 0;
354 }
355
356 __initcall(init_sys32_ioctl);
357
358 static void compat_ioctl_error(struct file *filp, unsigned int fd,
359 unsigned int cmd, unsigned long arg)
360 {
361 char buf[10];
362 char *fn = "?";
363 char *path;
364
365 /* find the name of the device. */
366 path = (char *)__get_free_page(GFP_KERNEL);
367 if (path) {
368 fn = d_path(filp->f_path.dentry, filp->f_path.mnt, path, PAGE_SIZE);
369 if (IS_ERR(fn))
370 fn = "?";
371 }
372
373 sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
374 if (!isprint(buf[1]))
375 sprintf(buf, "%02x", buf[1]);
376 compat_printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
377 "cmd(%08x){%s} arg(%08x) on %s\n",
378 current->comm, current->pid,
379 (int)fd, (unsigned int)cmd, buf,
380 (unsigned int)arg, fn);
381
382 if (path)
383 free_page((unsigned long)path);
384 }
385
386 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
387 unsigned long arg)
388 {
389 struct file *filp;
390 int error = -EBADF;
391 struct ioctl_trans *t;
392 int fput_needed;
393
394 filp = fget_light(fd, &fput_needed);
395 if (!filp)
396 goto out;
397
398 /* RED-PEN how should LSM module know it's handling 32bit? */
399 error = security_file_ioctl(filp, cmd, arg);
400 if (error)
401 goto out_fput;
402
403 /*
404 * To allow the compat_ioctl handlers to be self contained
405 * we need to check the common ioctls here first.
406 * Just handle them with the standard handlers below.
407 */
408 switch (cmd) {
409 case FIOCLEX:
410 case FIONCLEX:
411 case FIONBIO:
412 case FIOASYNC:
413 case FIOQSIZE:
414 break;
415
416 case FIBMAP:
417 case FIGETBSZ:
418 case FIONREAD:
419 if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
420 break;
421 /*FALL THROUGH*/
422
423 default:
424 if (filp->f_op && filp->f_op->compat_ioctl) {
425 error = filp->f_op->compat_ioctl(filp, cmd, arg);
426 if (error != -ENOIOCTLCMD)
427 goto out_fput;
428 }
429
430 if (!filp->f_op ||
431 (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
432 goto do_ioctl;
433 break;
434 }
435
436 for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
437 if (t->cmd == cmd)
438 goto found_handler;
439 }
440
441 if (S_ISSOCK(filp->f_path.dentry->d_inode->i_mode) &&
442 cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
443 error = siocdevprivate_ioctl(fd, cmd, arg);
444 } else {
445 static int count;
446
447 if (++count <= 50)
448 compat_ioctl_error(filp, fd, cmd, arg);
449 error = -EINVAL;
450 }
451
452 goto out_fput;
453
454 found_handler:
455 if (t->handler) {
456 lock_kernel();
457 error = t->handler(fd, cmd, arg, filp);
458 unlock_kernel();
459 goto out_fput;
460 }
461
462 do_ioctl:
463 error = vfs_ioctl(filp, fd, cmd, arg);
464 out_fput:
465 fput_light(filp, fput_needed);
466 out:
467 return error;
468 }
469
470 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
471 {
472 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
473 __get_user(kfl->l_type, &ufl->l_type) ||
474 __get_user(kfl->l_whence, &ufl->l_whence) ||
475 __get_user(kfl->l_start, &ufl->l_start) ||
476 __get_user(kfl->l_len, &ufl->l_len) ||
477 __get_user(kfl->l_pid, &ufl->l_pid))
478 return -EFAULT;
479 return 0;
480 }
481
482 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
483 {
484 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
485 __put_user(kfl->l_type, &ufl->l_type) ||
486 __put_user(kfl->l_whence, &ufl->l_whence) ||
487 __put_user(kfl->l_start, &ufl->l_start) ||
488 __put_user(kfl->l_len, &ufl->l_len) ||
489 __put_user(kfl->l_pid, &ufl->l_pid))
490 return -EFAULT;
491 return 0;
492 }
493
494 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
495 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
496 {
497 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
498 __get_user(kfl->l_type, &ufl->l_type) ||
499 __get_user(kfl->l_whence, &ufl->l_whence) ||
500 __get_user(kfl->l_start, &ufl->l_start) ||
501 __get_user(kfl->l_len, &ufl->l_len) ||
502 __get_user(kfl->l_pid, &ufl->l_pid))
503 return -EFAULT;
504 return 0;
505 }
506 #endif
507
508 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
509 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
510 {
511 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
512 __put_user(kfl->l_type, &ufl->l_type) ||
513 __put_user(kfl->l_whence, &ufl->l_whence) ||
514 __put_user(kfl->l_start, &ufl->l_start) ||
515 __put_user(kfl->l_len, &ufl->l_len) ||
516 __put_user(kfl->l_pid, &ufl->l_pid))
517 return -EFAULT;
518 return 0;
519 }
520 #endif
521
522 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
523 unsigned long arg)
524 {
525 mm_segment_t old_fs;
526 struct flock f;
527 long ret;
528
529 switch (cmd) {
530 case F_GETLK:
531 case F_SETLK:
532 case F_SETLKW:
533 ret = get_compat_flock(&f, compat_ptr(arg));
534 if (ret != 0)
535 break;
536 old_fs = get_fs();
537 set_fs(KERNEL_DS);
538 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
539 set_fs(old_fs);
540 if (cmd == F_GETLK && ret == 0) {
541 /* GETLK was successfule and we need to return the data...
542 * but it needs to fit in the compat structure.
543 * l_start shouldn't be too big, unless the original
544 * start + end is greater than COMPAT_OFF_T_MAX, in which
545 * case the app was asking for trouble, so we return
546 * -EOVERFLOW in that case.
547 * l_len could be too big, in which case we just truncate it,
548 * and only allow the app to see that part of the conflicting
549 * lock that might make sense to it anyway
550 */
551
552 if (f.l_start > COMPAT_OFF_T_MAX)
553 ret = -EOVERFLOW;
554 if (f.l_len > COMPAT_OFF_T_MAX)
555 f.l_len = COMPAT_OFF_T_MAX;
556 if (ret == 0)
557 ret = put_compat_flock(&f, compat_ptr(arg));
558 }
559 break;
560
561 case F_GETLK64:
562 case F_SETLK64:
563 case F_SETLKW64:
564 ret = get_compat_flock64(&f, compat_ptr(arg));
565 if (ret != 0)
566 break;
567 old_fs = get_fs();
568 set_fs(KERNEL_DS);
569 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
570 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
571 (unsigned long)&f);
572 set_fs(old_fs);
573 if (cmd == F_GETLK64 && ret == 0) {
574 /* need to return lock information - see above for commentary */
575 if (f.l_start > COMPAT_LOFF_T_MAX)
576 ret = -EOVERFLOW;
577 if (f.l_len > COMPAT_LOFF_T_MAX)
578 f.l_len = COMPAT_LOFF_T_MAX;
579 if (ret == 0)
580 ret = put_compat_flock64(&f, compat_ptr(arg));
581 }
582 break;
583
584 default:
585 ret = sys_fcntl(fd, cmd, arg);
586 break;
587 }
588 return ret;
589 }
590
591 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
592 unsigned long arg)
593 {
594 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
595 return -EINVAL;
596 return compat_sys_fcntl64(fd, cmd, arg);
597 }
598
599 asmlinkage long
600 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
601 {
602 long ret;
603 aio_context_t ctx64;
604
605 mm_segment_t oldfs = get_fs();
606 if (unlikely(get_user(ctx64, ctx32p)))
607 return -EFAULT;
608
609 set_fs(KERNEL_DS);
610 /* The __user pointer cast is valid because of the set_fs() */
611 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
612 set_fs(oldfs);
613 /* truncating is ok because it's a user address */
614 if (!ret)
615 ret = put_user((u32) ctx64, ctx32p);
616 return ret;
617 }
618
619 asmlinkage long
620 compat_sys_io_getevents(aio_context_t ctx_id,
621 unsigned long min_nr,
622 unsigned long nr,
623 struct io_event __user *events,
624 struct compat_timespec __user *timeout)
625 {
626 long ret;
627 struct timespec t;
628 struct timespec __user *ut = NULL;
629
630 ret = -EFAULT;
631 if (unlikely(!access_ok(VERIFY_WRITE, events,
632 nr * sizeof(struct io_event))))
633 goto out;
634 if (timeout) {
635 if (get_compat_timespec(&t, timeout))
636 goto out;
637
638 ut = compat_alloc_user_space(sizeof(*ut));
639 if (copy_to_user(ut, &t, sizeof(t)) )
640 goto out;
641 }
642 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
643 out:
644 return ret;
645 }
646
647 static inline long
648 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
649 {
650 compat_uptr_t uptr;
651 int i;
652
653 for (i = 0; i < nr; ++i) {
654 if (get_user(uptr, ptr32 + i))
655 return -EFAULT;
656 if (put_user(compat_ptr(uptr), ptr64 + i))
657 return -EFAULT;
658 }
659 return 0;
660 }
661
662 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
663
664 asmlinkage long
665 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
666 {
667 struct iocb __user * __user *iocb64;
668 long ret;
669
670 if (unlikely(nr < 0))
671 return -EINVAL;
672
673 if (nr > MAX_AIO_SUBMITS)
674 nr = MAX_AIO_SUBMITS;
675
676 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
677 ret = copy_iocb(nr, iocb, iocb64);
678 if (!ret)
679 ret = sys_io_submit(ctx_id, nr, iocb64);
680 return ret;
681 }
682
683 struct compat_ncp_mount_data {
684 compat_int_t version;
685 compat_uint_t ncp_fd;
686 __compat_uid_t mounted_uid;
687 compat_pid_t wdog_pid;
688 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
689 compat_uint_t time_out;
690 compat_uint_t retry_count;
691 compat_uint_t flags;
692 __compat_uid_t uid;
693 __compat_gid_t gid;
694 compat_mode_t file_mode;
695 compat_mode_t dir_mode;
696 };
697
698 struct compat_ncp_mount_data_v4 {
699 compat_int_t version;
700 compat_ulong_t flags;
701 compat_ulong_t mounted_uid;
702 compat_long_t wdog_pid;
703 compat_uint_t ncp_fd;
704 compat_uint_t time_out;
705 compat_uint_t retry_count;
706 compat_ulong_t uid;
707 compat_ulong_t gid;
708 compat_ulong_t file_mode;
709 compat_ulong_t dir_mode;
710 };
711
712 static void *do_ncp_super_data_conv(void *raw_data)
713 {
714 int version = *(unsigned int *)raw_data;
715
716 if (version == 3) {
717 struct compat_ncp_mount_data *c_n = raw_data;
718 struct ncp_mount_data *n = raw_data;
719
720 n->dir_mode = c_n->dir_mode;
721 n->file_mode = c_n->file_mode;
722 n->gid = c_n->gid;
723 n->uid = c_n->uid;
724 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
725 n->wdog_pid = c_n->wdog_pid;
726 n->mounted_uid = c_n->mounted_uid;
727 } else if (version == 4) {
728 struct compat_ncp_mount_data_v4 *c_n = raw_data;
729 struct ncp_mount_data_v4 *n = raw_data;
730
731 n->dir_mode = c_n->dir_mode;
732 n->file_mode = c_n->file_mode;
733 n->gid = c_n->gid;
734 n->uid = c_n->uid;
735 n->retry_count = c_n->retry_count;
736 n->time_out = c_n->time_out;
737 n->ncp_fd = c_n->ncp_fd;
738 n->wdog_pid = c_n->wdog_pid;
739 n->mounted_uid = c_n->mounted_uid;
740 n->flags = c_n->flags;
741 } else if (version != 5) {
742 return NULL;
743 }
744
745 return raw_data;
746 }
747
748 struct compat_smb_mount_data {
749 compat_int_t version;
750 __compat_uid_t mounted_uid;
751 __compat_uid_t uid;
752 __compat_gid_t gid;
753 compat_mode_t file_mode;
754 compat_mode_t dir_mode;
755 };
756
757 static void *do_smb_super_data_conv(void *raw_data)
758 {
759 struct smb_mount_data *s = raw_data;
760 struct compat_smb_mount_data *c_s = raw_data;
761
762 if (c_s->version != SMB_MOUNT_OLDVERSION)
763 goto out;
764 s->dir_mode = c_s->dir_mode;
765 s->file_mode = c_s->file_mode;
766 s->gid = c_s->gid;
767 s->uid = c_s->uid;
768 s->mounted_uid = c_s->mounted_uid;
769 out:
770 return raw_data;
771 }
772
773 struct compat_nfs_string {
774 compat_uint_t len;
775 compat_uptr_t data;
776 };
777
778 static inline void compat_nfs_string(struct nfs_string *dst,
779 struct compat_nfs_string *src)
780 {
781 dst->data = compat_ptr(src->data);
782 dst->len = src->len;
783 }
784
785 struct compat_nfs4_mount_data_v1 {
786 compat_int_t version;
787 compat_int_t flags;
788 compat_int_t rsize;
789 compat_int_t wsize;
790 compat_int_t timeo;
791 compat_int_t retrans;
792 compat_int_t acregmin;
793 compat_int_t acregmax;
794 compat_int_t acdirmin;
795 compat_int_t acdirmax;
796 struct compat_nfs_string client_addr;
797 struct compat_nfs_string mnt_path;
798 struct compat_nfs_string hostname;
799 compat_uint_t host_addrlen;
800 compat_uptr_t host_addr;
801 compat_int_t proto;
802 compat_int_t auth_flavourlen;
803 compat_uptr_t auth_flavours;
804 };
805
806 static int do_nfs4_super_data_conv(void *raw_data)
807 {
808 int version = *(compat_uint_t *) raw_data;
809
810 if (version == 1) {
811 struct compat_nfs4_mount_data_v1 *raw = raw_data;
812 struct nfs4_mount_data *real = raw_data;
813
814 /* copy the fields backwards */
815 real->auth_flavours = compat_ptr(raw->auth_flavours);
816 real->auth_flavourlen = raw->auth_flavourlen;
817 real->proto = raw->proto;
818 real->host_addr = compat_ptr(raw->host_addr);
819 real->host_addrlen = raw->host_addrlen;
820 compat_nfs_string(&real->hostname, &raw->hostname);
821 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
822 compat_nfs_string(&real->client_addr, &raw->client_addr);
823 real->acdirmax = raw->acdirmax;
824 real->acdirmin = raw->acdirmin;
825 real->acregmax = raw->acregmax;
826 real->acregmin = raw->acregmin;
827 real->retrans = raw->retrans;
828 real->timeo = raw->timeo;
829 real->wsize = raw->wsize;
830 real->rsize = raw->rsize;
831 real->flags = raw->flags;
832 real->version = raw->version;
833 }
834 else {
835 return -EINVAL;
836 }
837
838 return 0;
839 }
840
841 #define SMBFS_NAME "smbfs"
842 #define NCPFS_NAME "ncpfs"
843 #define NFS4_NAME "nfs4"
844
845 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
846 char __user * type, unsigned long flags,
847 void __user * data)
848 {
849 unsigned long type_page;
850 unsigned long data_page;
851 unsigned long dev_page;
852 char *dir_page;
853 int retval;
854
855 retval = copy_mount_options (type, &type_page);
856 if (retval < 0)
857 goto out;
858
859 dir_page = getname(dir_name);
860 retval = PTR_ERR(dir_page);
861 if (IS_ERR(dir_page))
862 goto out1;
863
864 retval = copy_mount_options (dev_name, &dev_page);
865 if (retval < 0)
866 goto out2;
867
868 retval = copy_mount_options (data, &data_page);
869 if (retval < 0)
870 goto out3;
871
872 retval = -EINVAL;
873
874 if (type_page && data_page) {
875 if (!strcmp((char *)type_page, SMBFS_NAME)) {
876 do_smb_super_data_conv((void *)data_page);
877 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
878 do_ncp_super_data_conv((void *)data_page);
879 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
880 if (do_nfs4_super_data_conv((void *) data_page))
881 goto out4;
882 }
883 }
884
885 lock_kernel();
886 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
887 flags, (void*)data_page);
888 unlock_kernel();
889
890 out4:
891 free_page(data_page);
892 out3:
893 free_page(dev_page);
894 out2:
895 putname(dir_page);
896 out1:
897 free_page(type_page);
898 out:
899 return retval;
900 }
901
902 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
903 #define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
904 ~(sizeof(compat_long_t)-1))
905
906 struct compat_old_linux_dirent {
907 compat_ulong_t d_ino;
908 compat_ulong_t d_offset;
909 unsigned short d_namlen;
910 char d_name[1];
911 };
912
913 struct compat_readdir_callback {
914 struct compat_old_linux_dirent __user *dirent;
915 int result;
916 };
917
918 static int compat_fillonedir(void *__buf, const char *name, int namlen,
919 loff_t offset, u64 ino, unsigned int d_type)
920 {
921 struct compat_readdir_callback *buf = __buf;
922 struct compat_old_linux_dirent __user *dirent;
923 compat_ulong_t d_ino;
924
925 if (buf->result)
926 return -EINVAL;
927 d_ino = ino;
928 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
929 return -EOVERFLOW;
930 buf->result++;
931 dirent = buf->dirent;
932 if (!access_ok(VERIFY_WRITE, dirent,
933 (unsigned long)(dirent->d_name + namlen + 1) -
934 (unsigned long)dirent))
935 goto efault;
936 if ( __put_user(d_ino, &dirent->d_ino) ||
937 __put_user(offset, &dirent->d_offset) ||
938 __put_user(namlen, &dirent->d_namlen) ||
939 __copy_to_user(dirent->d_name, name, namlen) ||
940 __put_user(0, dirent->d_name + namlen))
941 goto efault;
942 return 0;
943 efault:
944 buf->result = -EFAULT;
945 return -EFAULT;
946 }
947
948 asmlinkage long compat_sys_old_readdir(unsigned int fd,
949 struct compat_old_linux_dirent __user *dirent, unsigned int count)
950 {
951 int error;
952 struct file *file;
953 struct compat_readdir_callback buf;
954
955 error = -EBADF;
956 file = fget(fd);
957 if (!file)
958 goto out;
959
960 buf.result = 0;
961 buf.dirent = dirent;
962
963 error = vfs_readdir(file, compat_fillonedir, &buf);
964 if (error >= 0)
965 error = buf.result;
966
967 fput(file);
968 out:
969 return error;
970 }
971
972 struct compat_linux_dirent {
973 compat_ulong_t d_ino;
974 compat_ulong_t d_off;
975 unsigned short d_reclen;
976 char d_name[1];
977 };
978
979 struct compat_getdents_callback {
980 struct compat_linux_dirent __user *current_dir;
981 struct compat_linux_dirent __user *previous;
982 int count;
983 int error;
984 };
985
986 static int compat_filldir(void *__buf, const char *name, int namlen,
987 loff_t offset, u64 ino, unsigned int d_type)
988 {
989 struct compat_linux_dirent __user * dirent;
990 struct compat_getdents_callback *buf = __buf;
991 compat_ulong_t d_ino;
992 int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
993
994 buf->error = -EINVAL; /* only used if we fail.. */
995 if (reclen > buf->count)
996 return -EINVAL;
997 d_ino = ino;
998 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
999 return -EOVERFLOW;
1000 dirent = buf->previous;
1001 if (dirent) {
1002 if (__put_user(offset, &dirent->d_off))
1003 goto efault;
1004 }
1005 dirent = buf->current_dir;
1006 if (__put_user(d_ino, &dirent->d_ino))
1007 goto efault;
1008 if (__put_user(reclen, &dirent->d_reclen))
1009 goto efault;
1010 if (copy_to_user(dirent->d_name, name, namlen))
1011 goto efault;
1012 if (__put_user(0, dirent->d_name + namlen))
1013 goto efault;
1014 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1015 goto efault;
1016 buf->previous = dirent;
1017 dirent = (void __user *)dirent + reclen;
1018 buf->current_dir = dirent;
1019 buf->count -= reclen;
1020 return 0;
1021 efault:
1022 buf->error = -EFAULT;
1023 return -EFAULT;
1024 }
1025
1026 asmlinkage long compat_sys_getdents(unsigned int fd,
1027 struct compat_linux_dirent __user *dirent, unsigned int count)
1028 {
1029 struct file * file;
1030 struct compat_linux_dirent __user * lastdirent;
1031 struct compat_getdents_callback buf;
1032 int error;
1033
1034 error = -EFAULT;
1035 if (!access_ok(VERIFY_WRITE, dirent, count))
1036 goto out;
1037
1038 error = -EBADF;
1039 file = fget(fd);
1040 if (!file)
1041 goto out;
1042
1043 buf.current_dir = dirent;
1044 buf.previous = NULL;
1045 buf.count = count;
1046 buf.error = 0;
1047
1048 error = vfs_readdir(file, compat_filldir, &buf);
1049 if (error < 0)
1050 goto out_putf;
1051 error = buf.error;
1052 lastdirent = buf.previous;
1053 if (lastdirent) {
1054 if (put_user(file->f_pos, &lastdirent->d_off))
1055 error = -EFAULT;
1056 else
1057 error = count - buf.count;
1058 }
1059
1060 out_putf:
1061 fput(file);
1062 out:
1063 return error;
1064 }
1065
1066 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1067 #define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
1068
1069 struct compat_getdents_callback64 {
1070 struct linux_dirent64 __user *current_dir;
1071 struct linux_dirent64 __user *previous;
1072 int count;
1073 int error;
1074 };
1075
1076 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1077 u64 ino, unsigned int d_type)
1078 {
1079 struct linux_dirent64 __user *dirent;
1080 struct compat_getdents_callback64 *buf = __buf;
1081 int jj = NAME_OFFSET(dirent);
1082 int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
1083 u64 off;
1084
1085 buf->error = -EINVAL; /* only used if we fail.. */
1086 if (reclen > buf->count)
1087 return -EINVAL;
1088 dirent = buf->previous;
1089
1090 if (dirent) {
1091 if (__put_user_unaligned(offset, &dirent->d_off))
1092 goto efault;
1093 }
1094 dirent = buf->current_dir;
1095 if (__put_user_unaligned(ino, &dirent->d_ino))
1096 goto efault;
1097 off = 0;
1098 if (__put_user_unaligned(off, &dirent->d_off))
1099 goto efault;
1100 if (__put_user(reclen, &dirent->d_reclen))
1101 goto efault;
1102 if (__put_user(d_type, &dirent->d_type))
1103 goto efault;
1104 if (copy_to_user(dirent->d_name, name, namlen))
1105 goto efault;
1106 if (__put_user(0, dirent->d_name + namlen))
1107 goto efault;
1108 buf->previous = dirent;
1109 dirent = (void __user *)dirent + reclen;
1110 buf->current_dir = dirent;
1111 buf->count -= reclen;
1112 return 0;
1113 efault:
1114 buf->error = -EFAULT;
1115 return -EFAULT;
1116 }
1117
1118 asmlinkage long compat_sys_getdents64(unsigned int fd,
1119 struct linux_dirent64 __user * dirent, unsigned int count)
1120 {
1121 struct file * file;
1122 struct linux_dirent64 __user * lastdirent;
1123 struct compat_getdents_callback64 buf;
1124 int error;
1125
1126 error = -EFAULT;
1127 if (!access_ok(VERIFY_WRITE, dirent, count))
1128 goto out;
1129
1130 error = -EBADF;
1131 file = fget(fd);
1132 if (!file)
1133 goto out;
1134
1135 buf.current_dir = dirent;
1136 buf.previous = NULL;
1137 buf.count = count;
1138 buf.error = 0;
1139
1140 error = vfs_readdir(file, compat_filldir64, &buf);
1141 if (error < 0)
1142 goto out_putf;
1143 error = buf.error;
1144 lastdirent = buf.previous;
1145 if (lastdirent) {
1146 typeof(lastdirent->d_off) d_off = file->f_pos;
1147 error = -EFAULT;
1148 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1149 goto out_putf;
1150 error = count - buf.count;
1151 }
1152
1153 out_putf:
1154 fput(file);
1155 out:
1156 return error;
1157 }
1158 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1159
1160 static ssize_t compat_do_readv_writev(int type, struct file *file,
1161 const struct compat_iovec __user *uvector,
1162 unsigned long nr_segs, loff_t *pos)
1163 {
1164 compat_ssize_t tot_len;
1165 struct iovec iovstack[UIO_FASTIOV];
1166 struct iovec *iov=iovstack, *vector;
1167 ssize_t ret;
1168 int seg;
1169 io_fn_t fn;
1170 iov_fn_t fnv;
1171
1172 /*
1173 * SuS says "The readv() function *may* fail if the iovcnt argument
1174 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1175 * traditionally returned zero for zero segments, so...
1176 */
1177 ret = 0;
1178 if (nr_segs == 0)
1179 goto out;
1180
1181 /*
1182 * First get the "struct iovec" from user memory and
1183 * verify all the pointers
1184 */
1185 ret = -EINVAL;
1186 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1187 goto out;
1188 if (!file->f_op)
1189 goto out;
1190 if (nr_segs > UIO_FASTIOV) {
1191 ret = -ENOMEM;
1192 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1193 if (!iov)
1194 goto out;
1195 }
1196 ret = -EFAULT;
1197 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1198 goto out;
1199
1200 /*
1201 * Single unix specification:
1202 * We should -EINVAL if an element length is not >= 0 and fitting an
1203 * ssize_t. The total length is fitting an ssize_t
1204 *
1205 * Be careful here because iov_len is a size_t not an ssize_t
1206 */
1207 tot_len = 0;
1208 vector = iov;
1209 ret = -EINVAL;
1210 for (seg = 0 ; seg < nr_segs; seg++) {
1211 compat_ssize_t tmp = tot_len;
1212 compat_ssize_t len;
1213 compat_uptr_t buf;
1214
1215 if (__get_user(len, &uvector->iov_len) ||
1216 __get_user(buf, &uvector->iov_base)) {
1217 ret = -EFAULT;
1218 goto out;
1219 }
1220 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1221 goto out;
1222 tot_len += len;
1223 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1224 goto out;
1225 vector->iov_base = compat_ptr(buf);
1226 vector->iov_len = (compat_size_t) len;
1227 uvector++;
1228 vector++;
1229 }
1230 if (tot_len == 0) {
1231 ret = 0;
1232 goto out;
1233 }
1234
1235 ret = rw_verify_area(type, file, pos, tot_len);
1236 if (ret < 0)
1237 goto out;
1238
1239 ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
1240 if (ret)
1241 goto out;
1242
1243 fnv = NULL;
1244 if (type == READ) {
1245 fn = file->f_op->read;
1246 fnv = file->f_op->aio_read;
1247 } else {
1248 fn = (io_fn_t)file->f_op->write;
1249 fnv = file->f_op->aio_write;
1250 }
1251
1252 if (fnv)
1253 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1254 pos, fnv);
1255 else
1256 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1257
1258 out:
1259 if (iov != iovstack)
1260 kfree(iov);
1261 if ((ret + (type == READ)) > 0) {
1262 struct dentry *dentry = file->f_path.dentry;
1263 if (type == READ)
1264 fsnotify_access(dentry);
1265 else
1266 fsnotify_modify(dentry);
1267 }
1268 return ret;
1269 }
1270
1271 asmlinkage ssize_t
1272 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1273 {
1274 struct file *file;
1275 ssize_t ret = -EBADF;
1276
1277 file = fget(fd);
1278 if (!file)
1279 return -EBADF;
1280
1281 if (!(file->f_mode & FMODE_READ))
1282 goto out;
1283
1284 ret = -EINVAL;
1285 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1286 goto out;
1287
1288 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1289
1290 out:
1291 fput(file);
1292 return ret;
1293 }
1294
1295 asmlinkage ssize_t
1296 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1297 {
1298 struct file *file;
1299 ssize_t ret = -EBADF;
1300
1301 file = fget(fd);
1302 if (!file)
1303 return -EBADF;
1304 if (!(file->f_mode & FMODE_WRITE))
1305 goto out;
1306
1307 ret = -EINVAL;
1308 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1309 goto out;
1310
1311 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1312
1313 out:
1314 fput(file);
1315 return ret;
1316 }
1317
1318 asmlinkage long
1319 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1320 unsigned int nr_segs, unsigned int flags)
1321 {
1322 unsigned i;
1323 struct iovec __user *iov;
1324 if (nr_segs > UIO_MAXIOV)
1325 return -EINVAL;
1326 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1327 for (i = 0; i < nr_segs; i++) {
1328 struct compat_iovec v;
1329 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1330 get_user(v.iov_len, &iov32[i].iov_len) ||
1331 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1332 put_user(v.iov_len, &iov[i].iov_len))
1333 return -EFAULT;
1334 }
1335 return sys_vmsplice(fd, iov, nr_segs, flags);
1336 }
1337
1338 /*
1339 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1340 * O_LARGEFILE flag.
1341 */
1342 asmlinkage long
1343 compat_sys_open(const char __user *filename, int flags, int mode)
1344 {
1345 return do_sys_open(AT_FDCWD, filename, flags, mode);
1346 }
1347
1348 /*
1349 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1350 * O_LARGEFILE flag.
1351 */
1352 asmlinkage long
1353 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1354 {
1355 return do_sys_open(dfd, filename, flags, mode);
1356 }
1357
1358 /*
1359 * compat_count() counts the number of arguments/envelopes. It is basically
1360 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1361 * and envp pointers.
1362 */
1363 static int compat_count(compat_uptr_t __user *argv, int max)
1364 {
1365 int i = 0;
1366
1367 if (argv != NULL) {
1368 for (;;) {
1369 compat_uptr_t p;
1370
1371 if (get_user(p, argv))
1372 return -EFAULT;
1373 if (!p)
1374 break;
1375 argv++;
1376 if(++i > max)
1377 return -E2BIG;
1378 }
1379 }
1380 return i;
1381 }
1382
1383 /*
1384 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1385 * except that it works with 32 bit argv and envp pointers.
1386 */
1387 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1388 struct linux_binprm *bprm)
1389 {
1390 struct page *kmapped_page = NULL;
1391 char *kaddr = NULL;
1392 int ret;
1393
1394 while (argc-- > 0) {
1395 compat_uptr_t str;
1396 int len;
1397 unsigned long pos;
1398
1399 if (get_user(str, argv+argc) ||
1400 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1401 ret = -EFAULT;
1402 goto out;
1403 }
1404
1405 if (bprm->p < len) {
1406 ret = -E2BIG;
1407 goto out;
1408 }
1409
1410 bprm->p -= len;
1411 /* XXX: add architecture specific overflow check here. */
1412 pos = bprm->p;
1413
1414 while (len > 0) {
1415 int i, new, err;
1416 int offset, bytes_to_copy;
1417 struct page *page;
1418
1419 offset = pos % PAGE_SIZE;
1420 i = pos/PAGE_SIZE;
1421 page = bprm->page[i];
1422 new = 0;
1423 if (!page) {
1424 page = alloc_page(GFP_HIGHUSER);
1425 bprm->page[i] = page;
1426 if (!page) {
1427 ret = -ENOMEM;
1428 goto out;
1429 }
1430 new = 1;
1431 }
1432
1433 if (page != kmapped_page) {
1434 if (kmapped_page)
1435 kunmap(kmapped_page);
1436 kmapped_page = page;
1437 kaddr = kmap(kmapped_page);
1438 }
1439 if (new && offset)
1440 memset(kaddr, 0, offset);
1441 bytes_to_copy = PAGE_SIZE - offset;
1442 if (bytes_to_copy > len) {
1443 bytes_to_copy = len;
1444 if (new)
1445 memset(kaddr+offset+len, 0,
1446 PAGE_SIZE-offset-len);
1447 }
1448 err = copy_from_user(kaddr+offset, compat_ptr(str),
1449 bytes_to_copy);
1450 if (err) {
1451 ret = -EFAULT;
1452 goto out;
1453 }
1454
1455 pos += bytes_to_copy;
1456 str += bytes_to_copy;
1457 len -= bytes_to_copy;
1458 }
1459 }
1460 ret = 0;
1461 out:
1462 if (kmapped_page)
1463 kunmap(kmapped_page);
1464 return ret;
1465 }
1466
1467 #ifdef CONFIG_MMU
1468
1469 #define free_arg_pages(bprm) do { } while (0)
1470
1471 #else
1472
1473 static inline void free_arg_pages(struct linux_binprm *bprm)
1474 {
1475 int i;
1476
1477 for (i = 0; i < MAX_ARG_PAGES; i++) {
1478 if (bprm->page[i])
1479 __free_page(bprm->page[i]);
1480 bprm->page[i] = NULL;
1481 }
1482 }
1483
1484 #endif /* CONFIG_MMU */
1485
1486 /*
1487 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1488 * that it processes 32 bit argv and envp pointers.
1489 */
1490 int compat_do_execve(char * filename,
1491 compat_uptr_t __user *argv,
1492 compat_uptr_t __user *envp,
1493 struct pt_regs * regs)
1494 {
1495 struct linux_binprm *bprm;
1496 struct file *file;
1497 int retval;
1498 int i;
1499
1500 retval = -ENOMEM;
1501 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1502 if (!bprm)
1503 goto out_ret;
1504
1505 file = open_exec(filename);
1506 retval = PTR_ERR(file);
1507 if (IS_ERR(file))
1508 goto out_kfree;
1509
1510 sched_exec();
1511
1512 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1513 bprm->file = file;
1514 bprm->filename = filename;
1515 bprm->interp = filename;
1516 bprm->mm = mm_alloc();
1517 retval = -ENOMEM;
1518 if (!bprm->mm)
1519 goto out_file;
1520
1521 retval = init_new_context(current, bprm->mm);
1522 if (retval < 0)
1523 goto out_mm;
1524
1525 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1526 if ((retval = bprm->argc) < 0)
1527 goto out_mm;
1528
1529 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1530 if ((retval = bprm->envc) < 0)
1531 goto out_mm;
1532
1533 retval = security_bprm_alloc(bprm);
1534 if (retval)
1535 goto out;
1536
1537 retval = prepare_binprm(bprm);
1538 if (retval < 0)
1539 goto out;
1540
1541 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1542 if (retval < 0)
1543 goto out;
1544
1545 bprm->exec = bprm->p;
1546 retval = compat_copy_strings(bprm->envc, envp, bprm);
1547 if (retval < 0)
1548 goto out;
1549
1550 retval = compat_copy_strings(bprm->argc, argv, bprm);
1551 if (retval < 0)
1552 goto out;
1553
1554 retval = search_binary_handler(bprm, regs);
1555 if (retval >= 0) {
1556 free_arg_pages(bprm);
1557
1558 /* execve success */
1559 security_bprm_free(bprm);
1560 acct_update_integrals(current);
1561 kfree(bprm);
1562 return retval;
1563 }
1564
1565 out:
1566 /* Something went wrong, return the inode and free the argument pages*/
1567 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1568 struct page * page = bprm->page[i];
1569 if (page)
1570 __free_page(page);
1571 }
1572
1573 if (bprm->security)
1574 security_bprm_free(bprm);
1575
1576 out_mm:
1577 if (bprm->mm)
1578 mmdrop(bprm->mm);
1579
1580 out_file:
1581 if (bprm->file) {
1582 allow_write_access(bprm->file);
1583 fput(bprm->file);
1584 }
1585
1586 out_kfree:
1587 kfree(bprm);
1588
1589 out_ret:
1590 return retval;
1591 }
1592
1593 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1594
1595 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
1596
1597 /*
1598 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1599 * 64-bit unsigned longs.
1600 */
1601 static
1602 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1603 unsigned long *fdset)
1604 {
1605 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1606 if (ufdset) {
1607 unsigned long odd;
1608
1609 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1610 return -EFAULT;
1611
1612 odd = nr & 1UL;
1613 nr &= ~1UL;
1614 while (nr) {
1615 unsigned long h, l;
1616 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1617 return -EFAULT;
1618 ufdset += 2;
1619 *fdset++ = h << 32 | l;
1620 nr -= 2;
1621 }
1622 if (odd && __get_user(*fdset, ufdset))
1623 return -EFAULT;
1624 } else {
1625 /* Tricky, must clear full unsigned long in the
1626 * kernel fdset at the end, this makes sure that
1627 * actually happens.
1628 */
1629 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1630 }
1631 return 0;
1632 }
1633
1634 static
1635 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1636 unsigned long *fdset)
1637 {
1638 unsigned long odd;
1639 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1640
1641 if (!ufdset)
1642 return 0;
1643
1644 odd = nr & 1UL;
1645 nr &= ~1UL;
1646 while (nr) {
1647 unsigned long h, l;
1648 l = *fdset++;
1649 h = l >> 32;
1650 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1651 return -EFAULT;
1652 ufdset += 2;
1653 nr -= 2;
1654 }
1655 if (odd && __put_user(*fdset, ufdset))
1656 return -EFAULT;
1657 return 0;
1658 }
1659
1660
1661 /*
1662 * This is a virtual copy of sys_select from fs/select.c and probably
1663 * should be compared to it from time to time
1664 */
1665
1666 /*
1667 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1668 * like to be certain this leads to no problems. So I return
1669 * EINTR just for safety.
1670 *
1671 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1672 * I'm trying ERESTARTNOHAND which restart only when you want to.
1673 */
1674 #define MAX_SELECT_SECONDS \
1675 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1676
1677 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1678 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1679 {
1680 fd_set_bits fds;
1681 char *bits;
1682 int size, max_fds, ret = -EINVAL;
1683 struct fdtable *fdt;
1684
1685 if (n < 0)
1686 goto out_nofds;
1687
1688 /* max_fds can increase, so grab it once to avoid race */
1689 rcu_read_lock();
1690 fdt = files_fdtable(current->files);
1691 max_fds = fdt->max_fds;
1692 rcu_read_unlock();
1693 if (n > max_fds)
1694 n = max_fds;
1695
1696 /*
1697 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1698 * since we used fdset we need to allocate memory in units of
1699 * long-words.
1700 */
1701 ret = -ENOMEM;
1702 size = FDS_BYTES(n);
1703 bits = kmalloc(6 * size, GFP_KERNEL);
1704 if (!bits)
1705 goto out_nofds;
1706 fds.in = (unsigned long *) bits;
1707 fds.out = (unsigned long *) (bits + size);
1708 fds.ex = (unsigned long *) (bits + 2*size);
1709 fds.res_in = (unsigned long *) (bits + 3*size);
1710 fds.res_out = (unsigned long *) (bits + 4*size);
1711 fds.res_ex = (unsigned long *) (bits + 5*size);
1712
1713 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1714 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1715 (ret = compat_get_fd_set(n, exp, fds.ex)))
1716 goto out;
1717 zero_fd_set(n, fds.res_in);
1718 zero_fd_set(n, fds.res_out);
1719 zero_fd_set(n, fds.res_ex);
1720
1721 ret = do_select(n, &fds, timeout);
1722
1723 if (ret < 0)
1724 goto out;
1725 if (!ret) {
1726 ret = -ERESTARTNOHAND;
1727 if (signal_pending(current))
1728 goto out;
1729 ret = 0;
1730 }
1731
1732 if (compat_set_fd_set(n, inp, fds.res_in) ||
1733 compat_set_fd_set(n, outp, fds.res_out) ||
1734 compat_set_fd_set(n, exp, fds.res_ex))
1735 ret = -EFAULT;
1736 out:
1737 kfree(bits);
1738 out_nofds:
1739 return ret;
1740 }
1741
1742 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1743 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1744 struct compat_timeval __user *tvp)
1745 {
1746 s64 timeout = -1;
1747 struct compat_timeval tv;
1748 int ret;
1749
1750 if (tvp) {
1751 if (copy_from_user(&tv, tvp, sizeof(tv)))
1752 return -EFAULT;
1753
1754 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1755 return -EINVAL;
1756
1757 /* Cast to u64 to make GCC stop complaining */
1758 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1759 timeout = -1; /* infinite */
1760 else {
1761 timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
1762 timeout += tv.tv_sec * HZ;
1763 }
1764 }
1765
1766 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1767
1768 if (tvp) {
1769 struct compat_timeval rtv;
1770
1771 if (current->personality & STICKY_TIMEOUTS)
1772 goto sticky;
1773 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1774 rtv.tv_sec = timeout;
1775 if (compat_timeval_compare(&rtv, &tv) >= 0)
1776 rtv = tv;
1777 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1778 sticky:
1779 /*
1780 * If an application puts its timeval in read-only
1781 * memory, we don't want the Linux-specific update to
1782 * the timeval to cause a fault after the select has
1783 * completed successfully. However, because we're not
1784 * updating the timeval, we can't restart the system
1785 * call.
1786 */
1787 if (ret == -ERESTARTNOHAND)
1788 ret = -EINTR;
1789 }
1790 }
1791
1792 return ret;
1793 }
1794
1795 #ifdef TIF_RESTORE_SIGMASK
1796 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1797 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1798 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1799 compat_size_t sigsetsize)
1800 {
1801 compat_sigset_t ss32;
1802 sigset_t ksigmask, sigsaved;
1803 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1804 struct compat_timespec ts;
1805 int ret;
1806
1807 if (tsp) {
1808 if (copy_from_user(&ts, tsp, sizeof(ts)))
1809 return -EFAULT;
1810
1811 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1812 return -EINVAL;
1813 }
1814
1815 if (sigmask) {
1816 if (sigsetsize != sizeof(compat_sigset_t))
1817 return -EINVAL;
1818 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1819 return -EFAULT;
1820 sigset_from_compat(&ksigmask, &ss32);
1821
1822 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1823 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1824 }
1825
1826 do {
1827 if (tsp) {
1828 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1829 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1830 timeout += ts.tv_sec * (unsigned long)HZ;
1831 ts.tv_sec = 0;
1832 ts.tv_nsec = 0;
1833 } else {
1834 ts.tv_sec -= MAX_SELECT_SECONDS;
1835 timeout = MAX_SELECT_SECONDS * HZ;
1836 }
1837 }
1838
1839 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1840
1841 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1842
1843 if (tsp) {
1844 struct compat_timespec rts;
1845
1846 if (current->personality & STICKY_TIMEOUTS)
1847 goto sticky;
1848
1849 rts.tv_sec = timeout / HZ;
1850 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1851 if (rts.tv_nsec >= NSEC_PER_SEC) {
1852 rts.tv_sec++;
1853 rts.tv_nsec -= NSEC_PER_SEC;
1854 }
1855 if (compat_timespec_compare(&rts, &ts) >= 0)
1856 rts = ts;
1857 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1858 sticky:
1859 /*
1860 * If an application puts its timeval in read-only
1861 * memory, we don't want the Linux-specific update to
1862 * the timeval to cause a fault after the select has
1863 * completed successfully. However, because we're not
1864 * updating the timeval, we can't restart the system
1865 * call.
1866 */
1867 if (ret == -ERESTARTNOHAND)
1868 ret = -EINTR;
1869 }
1870 }
1871
1872 if (ret == -ERESTARTNOHAND) {
1873 /*
1874 * Don't restore the signal mask yet. Let do_signal() deliver
1875 * the signal on the way back to userspace, before the signal
1876 * mask is restored.
1877 */
1878 if (sigmask) {
1879 memcpy(&current->saved_sigmask, &sigsaved,
1880 sizeof(sigsaved));
1881 set_thread_flag(TIF_RESTORE_SIGMASK);
1882 }
1883 } else if (sigmask)
1884 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1885
1886 return ret;
1887 }
1888
1889 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1890 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1891 struct compat_timespec __user *tsp, void __user *sig)
1892 {
1893 compat_size_t sigsetsize = 0;
1894 compat_uptr_t up = 0;
1895
1896 if (sig) {
1897 if (!access_ok(VERIFY_READ, sig,
1898 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1899 __get_user(up, (compat_uptr_t __user *)sig) ||
1900 __get_user(sigsetsize,
1901 (compat_size_t __user *)(sig+sizeof(up))))
1902 return -EFAULT;
1903 }
1904 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1905 sigsetsize);
1906 }
1907
1908 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1909 unsigned int nfds, struct compat_timespec __user *tsp,
1910 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1911 {
1912 compat_sigset_t ss32;
1913 sigset_t ksigmask, sigsaved;
1914 struct compat_timespec ts;
1915 s64 timeout = -1;
1916 int ret;
1917
1918 if (tsp) {
1919 if (copy_from_user(&ts, tsp, sizeof(ts)))
1920 return -EFAULT;
1921
1922 /* We assume that ts.tv_sec is always lower than
1923 the number of seconds that can be expressed in
1924 an s64. Otherwise the compiler bitches at us */
1925 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1926 timeout += ts.tv_sec * HZ;
1927 }
1928
1929 if (sigmask) {
1930 if (sigsetsize != sizeof(compat_sigset_t))
1931 return -EINVAL;
1932 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1933 return -EFAULT;
1934 sigset_from_compat(&ksigmask, &ss32);
1935
1936 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1937 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1938 }
1939
1940 ret = do_sys_poll(ufds, nfds, &timeout);
1941
1942 /* We can restart this syscall, usually */
1943 if (ret == -EINTR) {
1944 /*
1945 * Don't restore the signal mask yet. Let do_signal() deliver
1946 * the signal on the way back to userspace, before the signal
1947 * mask is restored.
1948 */
1949 if (sigmask) {
1950 memcpy(&current->saved_sigmask, &sigsaved,
1951 sizeof(sigsaved));
1952 set_thread_flag(TIF_RESTORE_SIGMASK);
1953 }
1954 ret = -ERESTARTNOHAND;
1955 } else if (sigmask)
1956 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1957
1958 if (tsp && timeout >= 0) {
1959 struct compat_timespec rts;
1960
1961 if (current->personality & STICKY_TIMEOUTS)
1962 goto sticky;
1963 /* Yes, we know it's actually an s64, but it's also positive. */
1964 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1965 1000;
1966 rts.tv_sec = timeout;
1967 if (compat_timespec_compare(&rts, &ts) >= 0)
1968 rts = ts;
1969 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1970 sticky:
1971 /*
1972 * If an application puts its timeval in read-only
1973 * memory, we don't want the Linux-specific update to
1974 * the timeval to cause a fault after the select has
1975 * completed successfully. However, because we're not
1976 * updating the timeval, we can't restart the system
1977 * call.
1978 */
1979 if (ret == -ERESTARTNOHAND && timeout >= 0)
1980 ret = -EINTR;
1981 }
1982 }
1983
1984 return ret;
1985 }
1986 #endif /* TIF_RESTORE_SIGMASK */
1987
1988 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1989 /* Stuff for NFS server syscalls... */
1990 struct compat_nfsctl_svc {
1991 u16 svc32_port;
1992 s32 svc32_nthreads;
1993 };
1994
1995 struct compat_nfsctl_client {
1996 s8 cl32_ident[NFSCLNT_IDMAX+1];
1997 s32 cl32_naddr;
1998 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1999 s32 cl32_fhkeytype;
2000 s32 cl32_fhkeylen;
2001 u8 cl32_fhkey[NFSCLNT_KEYMAX];
2002 };
2003
2004 struct compat_nfsctl_export {
2005 char ex32_client[NFSCLNT_IDMAX+1];
2006 char ex32_path[NFS_MAXPATHLEN+1];
2007 compat_dev_t ex32_dev;
2008 compat_ino_t ex32_ino;
2009 compat_int_t ex32_flags;
2010 __compat_uid_t ex32_anon_uid;
2011 __compat_gid_t ex32_anon_gid;
2012 };
2013
2014 struct compat_nfsctl_fdparm {
2015 struct sockaddr gd32_addr;
2016 s8 gd32_path[NFS_MAXPATHLEN+1];
2017 compat_int_t gd32_version;
2018 };
2019
2020 struct compat_nfsctl_fsparm {
2021 struct sockaddr gd32_addr;
2022 s8 gd32_path[NFS_MAXPATHLEN+1];
2023 compat_int_t gd32_maxlen;
2024 };
2025
2026 struct compat_nfsctl_arg {
2027 compat_int_t ca32_version; /* safeguard */
2028 union {
2029 struct compat_nfsctl_svc u32_svc;
2030 struct compat_nfsctl_client u32_client;
2031 struct compat_nfsctl_export u32_export;
2032 struct compat_nfsctl_fdparm u32_getfd;
2033 struct compat_nfsctl_fsparm u32_getfs;
2034 } u;
2035 #define ca32_svc u.u32_svc
2036 #define ca32_client u.u32_client
2037 #define ca32_export u.u32_export
2038 #define ca32_getfd u.u32_getfd
2039 #define ca32_getfs u.u32_getfs
2040 };
2041
2042 union compat_nfsctl_res {
2043 __u8 cr32_getfh[NFS_FHSIZE];
2044 struct knfsd_fh cr32_getfs;
2045 };
2046
2047 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2048 struct compat_nfsctl_arg __user *arg)
2049 {
2050 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2051 get_user(karg->ca_version, &arg->ca32_version) ||
2052 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2053 __get_user(karg->ca_svc.svc_nthreads,
2054 &arg->ca32_svc.svc32_nthreads))
2055 return -EFAULT;
2056 return 0;
2057 }
2058
2059 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2060 struct compat_nfsctl_arg __user *arg)
2061 {
2062 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2063 sizeof(arg->ca32_client)) ||
2064 get_user(karg->ca_version, &arg->ca32_version) ||
2065 __copy_from_user(&karg->ca_client.cl_ident[0],
2066 &arg->ca32_client.cl32_ident[0],
2067 NFSCLNT_IDMAX) ||
2068 __get_user(karg->ca_client.cl_naddr,
2069 &arg->ca32_client.cl32_naddr) ||
2070 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2071 &arg->ca32_client.cl32_addrlist[0],
2072 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2073 __get_user(karg->ca_client.cl_fhkeytype,
2074 &arg->ca32_client.cl32_fhkeytype) ||
2075 __get_user(karg->ca_client.cl_fhkeylen,
2076 &arg->ca32_client.cl32_fhkeylen) ||
2077 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2078 &arg->ca32_client.cl32_fhkey[0],
2079 NFSCLNT_KEYMAX))
2080 return -EFAULT;
2081
2082 return 0;
2083 }
2084
2085 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2086 struct compat_nfsctl_arg __user *arg)
2087 {
2088 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2089 sizeof(arg->ca32_export)) ||
2090 get_user(karg->ca_version, &arg->ca32_version) ||
2091 __copy_from_user(&karg->ca_export.ex_client[0],
2092 &arg->ca32_export.ex32_client[0],
2093 NFSCLNT_IDMAX) ||
2094 __copy_from_user(&karg->ca_export.ex_path[0],
2095 &arg->ca32_export.ex32_path[0],
2096 NFS_MAXPATHLEN) ||
2097 __get_user(karg->ca_export.ex_dev,
2098 &arg->ca32_export.ex32_dev) ||
2099 __get_user(karg->ca_export.ex_ino,
2100 &arg->ca32_export.ex32_ino) ||
2101 __get_user(karg->ca_export.ex_flags,
2102 &arg->ca32_export.ex32_flags) ||
2103 __get_user(karg->ca_export.ex_anon_uid,
2104 &arg->ca32_export.ex32_anon_uid) ||
2105 __get_user(karg->ca_export.ex_anon_gid,
2106 &arg->ca32_export.ex32_anon_gid))
2107 return -EFAULT;
2108 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2109 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2110
2111 return 0;
2112 }
2113
2114 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2115 struct compat_nfsctl_arg __user *arg)
2116 {
2117 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2118 sizeof(arg->ca32_getfd)) ||
2119 get_user(karg->ca_version, &arg->ca32_version) ||
2120 __copy_from_user(&karg->ca_getfd.gd_addr,
2121 &arg->ca32_getfd.gd32_addr,
2122 (sizeof(struct sockaddr))) ||
2123 __copy_from_user(&karg->ca_getfd.gd_path,
2124 &arg->ca32_getfd.gd32_path,
2125 (NFS_MAXPATHLEN+1)) ||
2126 __get_user(karg->ca_getfd.gd_version,
2127 &arg->ca32_getfd.gd32_version))
2128 return -EFAULT;
2129
2130 return 0;
2131 }
2132
2133 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2134 struct compat_nfsctl_arg __user *arg)
2135 {
2136 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2137 get_user(karg->ca_version, &arg->ca32_version) ||
2138 __copy_from_user(&karg->ca_getfs.gd_addr,
2139 &arg->ca32_getfs.gd32_addr,
2140 (sizeof(struct sockaddr))) ||
2141 __copy_from_user(&karg->ca_getfs.gd_path,
2142 &arg->ca32_getfs.gd32_path,
2143 (NFS_MAXPATHLEN+1)) ||
2144 __get_user(karg->ca_getfs.gd_maxlen,
2145 &arg->ca32_getfs.gd32_maxlen))
2146 return -EFAULT;
2147
2148 return 0;
2149 }
2150
2151 /* This really doesn't need translations, we are only passing
2152 * back a union which contains opaque nfs file handle data.
2153 */
2154 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2155 union compat_nfsctl_res __user *res)
2156 {
2157 int err;
2158
2159 err = copy_to_user(res, kres, sizeof(*res));
2160
2161 return (err) ? -EFAULT : 0;
2162 }
2163
2164 asmlinkage long compat_sys_nfsservctl(int cmd,
2165 struct compat_nfsctl_arg __user *arg,
2166 union compat_nfsctl_res __user *res)
2167 {
2168 struct nfsctl_arg *karg;
2169 union nfsctl_res *kres;
2170 mm_segment_t oldfs;
2171 int err;
2172
2173 karg = kmalloc(sizeof(*karg), GFP_USER);
2174 kres = kmalloc(sizeof(*kres), GFP_USER);
2175 if(!karg || !kres) {
2176 err = -ENOMEM;
2177 goto done;
2178 }
2179
2180 switch(cmd) {
2181 case NFSCTL_SVC:
2182 err = compat_nfs_svc_trans(karg, arg);
2183 break;
2184
2185 case NFSCTL_ADDCLIENT:
2186 err = compat_nfs_clnt_trans(karg, arg);
2187 break;
2188
2189 case NFSCTL_DELCLIENT:
2190 err = compat_nfs_clnt_trans(karg, arg);
2191 break;
2192
2193 case NFSCTL_EXPORT:
2194 case NFSCTL_UNEXPORT:
2195 err = compat_nfs_exp_trans(karg, arg);
2196 break;
2197
2198 case NFSCTL_GETFD:
2199 err = compat_nfs_getfd_trans(karg, arg);
2200 break;
2201
2202 case NFSCTL_GETFS:
2203 err = compat_nfs_getfs_trans(karg, arg);
2204 break;
2205
2206 default:
2207 err = -EINVAL;
2208 break;
2209 }
2210
2211 if (err)
2212 goto done;
2213
2214 oldfs = get_fs();
2215 set_fs(KERNEL_DS);
2216 /* The __user pointer casts are valid because of the set_fs() */
2217 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2218 set_fs(oldfs);
2219
2220 if (err)
2221 goto done;
2222
2223 if((cmd == NFSCTL_GETFD) ||
2224 (cmd == NFSCTL_GETFS))
2225 err = compat_nfs_getfh_res_trans(kres, res);
2226
2227 done:
2228 kfree(karg);
2229 kfree(kres);
2230 return err;
2231 }
2232 #else /* !NFSD */
2233 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2234 {
2235 return sys_ni_syscall();
2236 }
2237 #endif
Support for the Chinese Samsung S3C2440 based development boards