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Linux 2.6.16.9
[wandboard.git] / fs / compat.c
blob5333c7d7427f6feeee2d72678893cde41294a3f4
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/acct.h>
48 #include <linux/mm.h>
49
50 #include <net/sock.h> /* siocdevprivate_ioctl */
51
52 #include <asm/uaccess.h>
53 #include <asm/mmu_context.h>
54 #include <asm/ioctls.h>
55
56 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
57
58 /*
59 * Not all architectures have sys_utime, so implement this in terms
60 * of sys_utimes.
61 */
62 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
63 {
64 struct timeval tv[2];
65
66 if (t) {
67 if (get_user(tv[0].tv_sec, &t->actime) ||
68 get_user(tv[1].tv_sec, &t->modtime))
69 return -EFAULT;
70 tv[0].tv_usec = 0;
71 tv[1].tv_usec = 0;
72 }
73 return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
74 }
75
76 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
77 {
78 struct timeval tv[2];
79
80 if (t) {
81 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
82 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
83 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
84 get_user(tv[1].tv_usec, &t[1].tv_usec))
85 return -EFAULT;
86 }
87 return do_utimes(dfd, filename, t ? tv : NULL);
88 }
89
90 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
91 {
92 return compat_sys_futimesat(AT_FDCWD, filename, t);
93 }
94
95 asmlinkage long compat_sys_newstat(char __user * filename,
96 struct compat_stat __user *statbuf)
97 {
98 struct kstat stat;
99 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
100
101 if (!error)
102 error = cp_compat_stat(&stat, statbuf);
103 return error;
104 }
105
106 asmlinkage long compat_sys_newlstat(char __user * filename,
107 struct compat_stat __user *statbuf)
108 {
109 struct kstat stat;
110 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
111
112 if (!error)
113 error = cp_compat_stat(&stat, statbuf);
114 return error;
115 }
116
117 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
118 struct compat_stat __user *statbuf, int flag)
119 {
120 struct kstat stat;
121 int error = -EINVAL;
122
123 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
124 goto out;
125
126 if (flag & AT_SYMLINK_NOFOLLOW)
127 error = vfs_lstat_fd(dfd, filename, &stat);
128 else
129 error = vfs_stat_fd(dfd, filename, &stat);
130
131 if (!error)
132 error = cp_compat_stat(&stat, statbuf);
133
134 out:
135 return error;
136 }
137
138 asmlinkage long compat_sys_newfstat(unsigned int fd,
139 struct compat_stat __user * statbuf)
140 {
141 struct kstat stat;
142 int error = vfs_fstat(fd, &stat);
143
144 if (!error)
145 error = cp_compat_stat(&stat, statbuf);
146 return error;
147 }
148
149 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
150 {
151
152 if (sizeof ubuf->f_blocks == 4) {
153 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
154 0xffffffff00000000ULL)
155 return -EOVERFLOW;
156 /* f_files and f_ffree may be -1; it's okay
157 * to stuff that into 32 bits */
158 if (kbuf->f_files != 0xffffffffffffffffULL
159 && (kbuf->f_files & 0xffffffff00000000ULL))
160 return -EOVERFLOW;
161 if (kbuf->f_ffree != 0xffffffffffffffffULL
162 && (kbuf->f_ffree & 0xffffffff00000000ULL))
163 return -EOVERFLOW;
164 }
165 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
166 __put_user(kbuf->f_type, &ubuf->f_type) ||
167 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
168 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
169 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
170 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
171 __put_user(kbuf->f_files, &ubuf->f_files) ||
172 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
173 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
174 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
175 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
176 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
177 __put_user(0, &ubuf->f_spare[0]) ||
178 __put_user(0, &ubuf->f_spare[1]) ||
179 __put_user(0, &ubuf->f_spare[2]) ||
180 __put_user(0, &ubuf->f_spare[3]) ||
181 __put_user(0, &ubuf->f_spare[4]))
182 return -EFAULT;
183 return 0;
184 }
185
186 /*
187 * The following statfs calls are copies of code from fs/open.c and
188 * should be checked against those from time to time
189 */
190 asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
191 {
192 struct nameidata nd;
193 int error;
194
195 error = user_path_walk(path, &nd);
196 if (!error) {
197 struct kstatfs tmp;
198 error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
199 if (!error)
200 error = put_compat_statfs(buf, &tmp);
201 path_release(&nd);
202 }
203 return error;
204 }
205
206 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
207 {
208 struct file * file;
209 struct kstatfs tmp;
210 int error;
211
212 error = -EBADF;
213 file = fget(fd);
214 if (!file)
215 goto out;
216 error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
217 if (!error)
218 error = put_compat_statfs(buf, &tmp);
219 fput(file);
220 out:
221 return error;
222 }
223
224 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
225 {
226 if (sizeof ubuf->f_blocks == 4) {
227 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
228 0xffffffff00000000ULL)
229 return -EOVERFLOW;
230 /* f_files and f_ffree may be -1; it's okay
231 * to stuff that into 32 bits */
232 if (kbuf->f_files != 0xffffffffffffffffULL
233 && (kbuf->f_files & 0xffffffff00000000ULL))
234 return -EOVERFLOW;
235 if (kbuf->f_ffree != 0xffffffffffffffffULL
236 && (kbuf->f_ffree & 0xffffffff00000000ULL))
237 return -EOVERFLOW;
238 }
239 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
240 __put_user(kbuf->f_type, &ubuf->f_type) ||
241 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
242 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
243 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
244 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
245 __put_user(kbuf->f_files, &ubuf->f_files) ||
246 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
247 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
248 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
249 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
250 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
251 return -EFAULT;
252 return 0;
253 }
254
255 asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
256 {
257 struct nameidata nd;
258 int error;
259
260 if (sz != sizeof(*buf))
261 return -EINVAL;
262
263 error = user_path_walk(path, &nd);
264 if (!error) {
265 struct kstatfs tmp;
266 error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
267 if (!error)
268 error = put_compat_statfs64(buf, &tmp);
269 path_release(&nd);
270 }
271 return error;
272 }
273
274 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
275 {
276 struct file * file;
277 struct kstatfs tmp;
278 int error;
279
280 if (sz != sizeof(*buf))
281 return -EINVAL;
282
283 error = -EBADF;
284 file = fget(fd);
285 if (!file)
286 goto out;
287 error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
288 if (!error)
289 error = put_compat_statfs64(buf, &tmp);
290 fput(file);
291 out:
292 return error;
293 }
294
295 /* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
296
297 #define IOCTL_HASHSIZE 256
298 static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
299
300 extern struct ioctl_trans ioctl_start[];
301 extern int ioctl_table_size;
302
303 static inline unsigned long ioctl32_hash(unsigned long cmd)
304 {
305 return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
306 }
307
308 static void ioctl32_insert_translation(struct ioctl_trans *trans)
309 {
310 unsigned long hash;
311 struct ioctl_trans *t;
312
313 hash = ioctl32_hash (trans->cmd);
314 if (!ioctl32_hash_table[hash])
315 ioctl32_hash_table[hash] = trans;
316 else {
317 t = ioctl32_hash_table[hash];
318 while (t->next)
319 t = t->next;
320 trans->next = NULL;
321 t->next = trans;
322 }
323 }
324
325 static int __init init_sys32_ioctl(void)
326 {
327 int i;
328
329 for (i = 0; i < ioctl_table_size; i++) {
330 if (ioctl_start[i].next != 0) {
331 printk("ioctl translation %d bad\n",i);
332 return -1;
333 }
334
335 ioctl32_insert_translation(&ioctl_start[i]);
336 }
337 return 0;
338 }
339
340 __initcall(init_sys32_ioctl);
341
342 static void compat_ioctl_error(struct file *filp, unsigned int fd,
343 unsigned int cmd, unsigned long arg)
344 {
345 char buf[10];
346 char *fn = "?";
347 char *path;
348
349 /* find the name of the device. */
350 path = (char *)__get_free_page(GFP_KERNEL);
351 if (path) {
352 fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE);
353 if (IS_ERR(fn))
354 fn = "?";
355 }
356
357 sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
358 if (!isprint(buf[1]))
359 sprintf(buf, "%02x", buf[1]);
360 printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
361 "cmd(%08x){%s} arg(%08x) on %s\n",
362 current->comm, current->pid,
363 (int)fd, (unsigned int)cmd, buf,
364 (unsigned int)arg, fn);
365
366 if (path)
367 free_page((unsigned long)path);
368 }
369
370 asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
371 unsigned long arg)
372 {
373 struct file *filp;
374 int error = -EBADF;
375 struct ioctl_trans *t;
376 int fput_needed;
377
378 filp = fget_light(fd, &fput_needed);
379 if (!filp)
380 goto out;
381
382 /* RED-PEN how should LSM module know it's handling 32bit? */
383 error = security_file_ioctl(filp, cmd, arg);
384 if (error)
385 goto out_fput;
386
387 /*
388 * To allow the compat_ioctl handlers to be self contained
389 * we need to check the common ioctls here first.
390 * Just handle them with the standard handlers below.
391 */
392 switch (cmd) {
393 case FIOCLEX:
394 case FIONCLEX:
395 case FIONBIO:
396 case FIOASYNC:
397 case FIOQSIZE:
398 break;
399
400 case FIBMAP:
401 case FIGETBSZ:
402 case FIONREAD:
403 if (S_ISREG(filp->f_dentry->d_inode->i_mode))
404 break;
405 /*FALL THROUGH*/
406
407 default:
408 if (filp->f_op && filp->f_op->compat_ioctl) {
409 error = filp->f_op->compat_ioctl(filp, cmd, arg);
410 if (error != -ENOIOCTLCMD)
411 goto out_fput;
412 }
413
414 if (!filp->f_op ||
415 (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
416 goto do_ioctl;
417 break;
418 }
419
420 for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
421 if (t->cmd == cmd)
422 goto found_handler;
423 }
424
425 if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) &&
426 cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
427 error = siocdevprivate_ioctl(fd, cmd, arg);
428 } else {
429 static int count;
430
431 if (++count <= 50)
432 compat_ioctl_error(filp, fd, cmd, arg);
433 error = -EINVAL;
434 }
435
436 goto out_fput;
437
438 found_handler:
439 if (t->handler) {
440 lock_kernel();
441 error = t->handler(fd, cmd, arg, filp);
442 unlock_kernel();
443 goto out_fput;
444 }
445
446 do_ioctl:
447 error = vfs_ioctl(filp, fd, cmd, arg);
448 out_fput:
449 fput_light(filp, fput_needed);
450 out:
451 return error;
452 }
453
454 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
455 {
456 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
457 __get_user(kfl->l_type, &ufl->l_type) ||
458 __get_user(kfl->l_whence, &ufl->l_whence) ||
459 __get_user(kfl->l_start, &ufl->l_start) ||
460 __get_user(kfl->l_len, &ufl->l_len) ||
461 __get_user(kfl->l_pid, &ufl->l_pid))
462 return -EFAULT;
463 return 0;
464 }
465
466 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
467 {
468 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
469 __put_user(kfl->l_type, &ufl->l_type) ||
470 __put_user(kfl->l_whence, &ufl->l_whence) ||
471 __put_user(kfl->l_start, &ufl->l_start) ||
472 __put_user(kfl->l_len, &ufl->l_len) ||
473 __put_user(kfl->l_pid, &ufl->l_pid))
474 return -EFAULT;
475 return 0;
476 }
477
478 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
479 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
480 {
481 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
482 __get_user(kfl->l_type, &ufl->l_type) ||
483 __get_user(kfl->l_whence, &ufl->l_whence) ||
484 __get_user(kfl->l_start, &ufl->l_start) ||
485 __get_user(kfl->l_len, &ufl->l_len) ||
486 __get_user(kfl->l_pid, &ufl->l_pid))
487 return -EFAULT;
488 return 0;
489 }
490 #endif
491
492 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
493 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
494 {
495 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
496 __put_user(kfl->l_type, &ufl->l_type) ||
497 __put_user(kfl->l_whence, &ufl->l_whence) ||
498 __put_user(kfl->l_start, &ufl->l_start) ||
499 __put_user(kfl->l_len, &ufl->l_len) ||
500 __put_user(kfl->l_pid, &ufl->l_pid))
501 return -EFAULT;
502 return 0;
503 }
504 #endif
505
506 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
507 unsigned long arg)
508 {
509 mm_segment_t old_fs;
510 struct flock f;
511 long ret;
512
513 switch (cmd) {
514 case F_GETLK:
515 case F_SETLK:
516 case F_SETLKW:
517 ret = get_compat_flock(&f, compat_ptr(arg));
518 if (ret != 0)
519 break;
520 old_fs = get_fs();
521 set_fs(KERNEL_DS);
522 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
523 set_fs(old_fs);
524 if (cmd == F_GETLK && ret == 0) {
525 /* GETLK was successfule and we need to return the data...
526 * but it needs to fit in the compat structure.
527 * l_start shouldn't be too big, unless the original
528 * start + end is greater than COMPAT_OFF_T_MAX, in which
529 * case the app was asking for trouble, so we return
530 * -EOVERFLOW in that case.
531 * l_len could be too big, in which case we just truncate it,
532 * and only allow the app to see that part of the conflicting
533 * lock that might make sense to it anyway
534 */
535
536 if (f.l_start > COMPAT_OFF_T_MAX)
537 ret = -EOVERFLOW;
538 if (f.l_len > COMPAT_OFF_T_MAX)
539 f.l_len = COMPAT_OFF_T_MAX;
540 if (ret == 0)
541 ret = put_compat_flock(&f, compat_ptr(arg));
542 }
543 break;
544
545 case F_GETLK64:
546 case F_SETLK64:
547 case F_SETLKW64:
548 ret = get_compat_flock64(&f, compat_ptr(arg));
549 if (ret != 0)
550 break;
551 old_fs = get_fs();
552 set_fs(KERNEL_DS);
553 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
554 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
555 (unsigned long)&f);
556 set_fs(old_fs);
557 if (cmd == F_GETLK64 && ret == 0) {
558 /* need to return lock information - see above for commentary */
559 if (f.l_start > COMPAT_LOFF_T_MAX)
560 ret = -EOVERFLOW;
561 if (f.l_len > COMPAT_LOFF_T_MAX)
562 f.l_len = COMPAT_LOFF_T_MAX;
563 if (ret == 0)
564 ret = put_compat_flock64(&f, compat_ptr(arg));
565 }
566 break;
567
568 default:
569 ret = sys_fcntl(fd, cmd, arg);
570 break;
571 }
572 return ret;
573 }
574
575 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
576 unsigned long arg)
577 {
578 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
579 return -EINVAL;
580 return compat_sys_fcntl64(fd, cmd, arg);
581 }
582
583 asmlinkage long
584 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
585 {
586 long ret;
587 aio_context_t ctx64;
588
589 mm_segment_t oldfs = get_fs();
590 if (unlikely(get_user(ctx64, ctx32p)))
591 return -EFAULT;
592
593 set_fs(KERNEL_DS);
594 /* The __user pointer cast is valid because of the set_fs() */
595 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
596 set_fs(oldfs);
597 /* truncating is ok because it's a user address */
598 if (!ret)
599 ret = put_user((u32) ctx64, ctx32p);
600 return ret;
601 }
602
603 asmlinkage long
604 compat_sys_io_getevents(aio_context_t ctx_id,
605 unsigned long min_nr,
606 unsigned long nr,
607 struct io_event __user *events,
608 struct compat_timespec __user *timeout)
609 {
610 long ret;
611 struct timespec t;
612 struct timespec __user *ut = NULL;
613
614 ret = -EFAULT;
615 if (unlikely(!access_ok(VERIFY_WRITE, events,
616 nr * sizeof(struct io_event))))
617 goto out;
618 if (timeout) {
619 if (get_compat_timespec(&t, timeout))
620 goto out;
621
622 ut = compat_alloc_user_space(sizeof(*ut));
623 if (copy_to_user(ut, &t, sizeof(t)) )
624 goto out;
625 }
626 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
627 out:
628 return ret;
629 }
630
631 static inline long
632 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
633 {
634 compat_uptr_t uptr;
635 int i;
636
637 for (i = 0; i < nr; ++i) {
638 if (get_user(uptr, ptr32 + i))
639 return -EFAULT;
640 if (put_user(compat_ptr(uptr), ptr64 + i))
641 return -EFAULT;
642 }
643 return 0;
644 }
645
646 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
647
648 asmlinkage long
649 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
650 {
651 struct iocb __user * __user *iocb64;
652 long ret;
653
654 if (unlikely(nr < 0))
655 return -EINVAL;
656
657 if (nr > MAX_AIO_SUBMITS)
658 nr = MAX_AIO_SUBMITS;
659
660 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
661 ret = copy_iocb(nr, iocb, iocb64);
662 if (!ret)
663 ret = sys_io_submit(ctx_id, nr, iocb64);
664 return ret;
665 }
666
667 struct compat_ncp_mount_data {
668 compat_int_t version;
669 compat_uint_t ncp_fd;
670 __compat_uid_t mounted_uid;
671 compat_pid_t wdog_pid;
672 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
673 compat_uint_t time_out;
674 compat_uint_t retry_count;
675 compat_uint_t flags;
676 __compat_uid_t uid;
677 __compat_gid_t gid;
678 compat_mode_t file_mode;
679 compat_mode_t dir_mode;
680 };
681
682 struct compat_ncp_mount_data_v4 {
683 compat_int_t version;
684 compat_ulong_t flags;
685 compat_ulong_t mounted_uid;
686 compat_long_t wdog_pid;
687 compat_uint_t ncp_fd;
688 compat_uint_t time_out;
689 compat_uint_t retry_count;
690 compat_ulong_t uid;
691 compat_ulong_t gid;
692 compat_ulong_t file_mode;
693 compat_ulong_t dir_mode;
694 };
695
696 static void *do_ncp_super_data_conv(void *raw_data)
697 {
698 int version = *(unsigned int *)raw_data;
699
700 if (version == 3) {
701 struct compat_ncp_mount_data *c_n = raw_data;
702 struct ncp_mount_data *n = raw_data;
703
704 n->dir_mode = c_n->dir_mode;
705 n->file_mode = c_n->file_mode;
706 n->gid = c_n->gid;
707 n->uid = c_n->uid;
708 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
709 n->wdog_pid = c_n->wdog_pid;
710 n->mounted_uid = c_n->mounted_uid;
711 } else if (version == 4) {
712 struct compat_ncp_mount_data_v4 *c_n = raw_data;
713 struct ncp_mount_data_v4 *n = raw_data;
714
715 n->dir_mode = c_n->dir_mode;
716 n->file_mode = c_n->file_mode;
717 n->gid = c_n->gid;
718 n->uid = c_n->uid;
719 n->retry_count = c_n->retry_count;
720 n->time_out = c_n->time_out;
721 n->ncp_fd = c_n->ncp_fd;
722 n->wdog_pid = c_n->wdog_pid;
723 n->mounted_uid = c_n->mounted_uid;
724 n->flags = c_n->flags;
725 } else if (version != 5) {
726 return NULL;
727 }
728
729 return raw_data;
730 }
731
732 struct compat_smb_mount_data {
733 compat_int_t version;
734 __compat_uid_t mounted_uid;
735 __compat_uid_t uid;
736 __compat_gid_t gid;
737 compat_mode_t file_mode;
738 compat_mode_t dir_mode;
739 };
740
741 static void *do_smb_super_data_conv(void *raw_data)
742 {
743 struct smb_mount_data *s = raw_data;
744 struct compat_smb_mount_data *c_s = raw_data;
745
746 if (c_s->version != SMB_MOUNT_OLDVERSION)
747 goto out;
748 s->dir_mode = c_s->dir_mode;
749 s->file_mode = c_s->file_mode;
750 s->gid = c_s->gid;
751 s->uid = c_s->uid;
752 s->mounted_uid = c_s->mounted_uid;
753 out:
754 return raw_data;
755 }
756
757 struct compat_nfs_string {
758 compat_uint_t len;
759 compat_uptr_t data;
760 };
761
762 static inline void compat_nfs_string(struct nfs_string *dst,
763 struct compat_nfs_string *src)
764 {
765 dst->data = compat_ptr(src->data);
766 dst->len = src->len;
767 }
768
769 struct compat_nfs4_mount_data_v1 {
770 compat_int_t version;
771 compat_int_t flags;
772 compat_int_t rsize;
773 compat_int_t wsize;
774 compat_int_t timeo;
775 compat_int_t retrans;
776 compat_int_t acregmin;
777 compat_int_t acregmax;
778 compat_int_t acdirmin;
779 compat_int_t acdirmax;
780 struct compat_nfs_string client_addr;
781 struct compat_nfs_string mnt_path;
782 struct compat_nfs_string hostname;
783 compat_uint_t host_addrlen;
784 compat_uptr_t host_addr;
785 compat_int_t proto;
786 compat_int_t auth_flavourlen;
787 compat_uptr_t auth_flavours;
788 };
789
790 static int do_nfs4_super_data_conv(void *raw_data)
791 {
792 int version = *(compat_uint_t *) raw_data;
793
794 if (version == 1) {
795 struct compat_nfs4_mount_data_v1 *raw = raw_data;
796 struct nfs4_mount_data *real = raw_data;
797
798 /* copy the fields backwards */
799 real->auth_flavours = compat_ptr(raw->auth_flavours);
800 real->auth_flavourlen = raw->auth_flavourlen;
801 real->proto = raw->proto;
802 real->host_addr = compat_ptr(raw->host_addr);
803 real->host_addrlen = raw->host_addrlen;
804 compat_nfs_string(&real->hostname, &raw->hostname);
805 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
806 compat_nfs_string(&real->client_addr, &raw->client_addr);
807 real->acdirmax = raw->acdirmax;
808 real->acdirmin = raw->acdirmin;
809 real->acregmax = raw->acregmax;
810 real->acregmin = raw->acregmin;
811 real->retrans = raw->retrans;
812 real->timeo = raw->timeo;
813 real->wsize = raw->wsize;
814 real->rsize = raw->rsize;
815 real->flags = raw->flags;
816 real->version = raw->version;
817 }
818 else {
819 return -EINVAL;
820 }
821
822 return 0;
823 }
824
825 extern int copy_mount_options (const void __user *, unsigned long *);
826
827 #define SMBFS_NAME "smbfs"
828 #define NCPFS_NAME "ncpfs"
829 #define NFS4_NAME "nfs4"
830
831 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
832 char __user * type, unsigned long flags,
833 void __user * data)
834 {
835 unsigned long type_page;
836 unsigned long data_page;
837 unsigned long dev_page;
838 char *dir_page;
839 int retval;
840
841 retval = copy_mount_options (type, &type_page);
842 if (retval < 0)
843 goto out;
844
845 dir_page = getname(dir_name);
846 retval = PTR_ERR(dir_page);
847 if (IS_ERR(dir_page))
848 goto out1;
849
850 retval = copy_mount_options (dev_name, &dev_page);
851 if (retval < 0)
852 goto out2;
853
854 retval = copy_mount_options (data, &data_page);
855 if (retval < 0)
856 goto out3;
857
858 retval = -EINVAL;
859
860 if (type_page) {
861 if (!strcmp((char *)type_page, SMBFS_NAME)) {
862 do_smb_super_data_conv((void *)data_page);
863 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
864 do_ncp_super_data_conv((void *)data_page);
865 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
866 if (do_nfs4_super_data_conv((void *) data_page))
867 goto out4;
868 }
869 }
870
871 lock_kernel();
872 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
873 flags, (void*)data_page);
874 unlock_kernel();
875
876 out4:
877 free_page(data_page);
878 out3:
879 free_page(dev_page);
880 out2:
881 putname(dir_page);
882 out1:
883 free_page(type_page);
884 out:
885 return retval;
886 }
887
888 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
889 #define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
890 ~(sizeof(compat_long_t)-1))
891
892 struct compat_old_linux_dirent {
893 compat_ulong_t d_ino;
894 compat_ulong_t d_offset;
895 unsigned short d_namlen;
896 char d_name[1];
897 };
898
899 struct compat_readdir_callback {
900 struct compat_old_linux_dirent __user *dirent;
901 int result;
902 };
903
904 static int compat_fillonedir(void *__buf, const char *name, int namlen,
905 loff_t offset, ino_t ino, unsigned int d_type)
906 {
907 struct compat_readdir_callback *buf = __buf;
908 struct compat_old_linux_dirent __user *dirent;
909
910 if (buf->result)
911 return -EINVAL;
912 buf->result++;
913 dirent = buf->dirent;
914 if (!access_ok(VERIFY_WRITE, dirent,
915 (unsigned long)(dirent->d_name + namlen + 1) -
916 (unsigned long)dirent))
917 goto efault;
918 if ( __put_user(ino, &dirent->d_ino) ||
919 __put_user(offset, &dirent->d_offset) ||
920 __put_user(namlen, &dirent->d_namlen) ||
921 __copy_to_user(dirent->d_name, name, namlen) ||
922 __put_user(0, dirent->d_name + namlen))
923 goto efault;
924 return 0;
925 efault:
926 buf->result = -EFAULT;
927 return -EFAULT;
928 }
929
930 asmlinkage long compat_sys_old_readdir(unsigned int fd,
931 struct compat_old_linux_dirent __user *dirent, unsigned int count)
932 {
933 int error;
934 struct file *file;
935 struct compat_readdir_callback buf;
936
937 error = -EBADF;
938 file = fget(fd);
939 if (!file)
940 goto out;
941
942 buf.result = 0;
943 buf.dirent = dirent;
944
945 error = vfs_readdir(file, compat_fillonedir, &buf);
946 if (error >= 0)
947 error = buf.result;
948
949 fput(file);
950 out:
951 return error;
952 }
953
954 struct compat_linux_dirent {
955 compat_ulong_t d_ino;
956 compat_ulong_t d_off;
957 unsigned short d_reclen;
958 char d_name[1];
959 };
960
961 struct compat_getdents_callback {
962 struct compat_linux_dirent __user *current_dir;
963 struct compat_linux_dirent __user *previous;
964 int count;
965 int error;
966 };
967
968 static int compat_filldir(void *__buf, const char *name, int namlen,
969 loff_t offset, ino_t ino, unsigned int d_type)
970 {
971 struct compat_linux_dirent __user * dirent;
972 struct compat_getdents_callback *buf = __buf;
973 int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
974
975 buf->error = -EINVAL; /* only used if we fail.. */
976 if (reclen > buf->count)
977 return -EINVAL;
978 dirent = buf->previous;
979 if (dirent) {
980 if (__put_user(offset, &dirent->d_off))
981 goto efault;
982 }
983 dirent = buf->current_dir;
984 if (__put_user(ino, &dirent->d_ino))
985 goto efault;
986 if (__put_user(reclen, &dirent->d_reclen))
987 goto efault;
988 if (copy_to_user(dirent->d_name, name, namlen))
989 goto efault;
990 if (__put_user(0, dirent->d_name + namlen))
991 goto efault;
992 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
993 goto efault;
994 buf->previous = dirent;
995 dirent = (void __user *)dirent + reclen;
996 buf->current_dir = dirent;
997 buf->count -= reclen;
998 return 0;
999 efault:
1000 buf->error = -EFAULT;
1001 return -EFAULT;
1002 }
1003
1004 asmlinkage long compat_sys_getdents(unsigned int fd,
1005 struct compat_linux_dirent __user *dirent, unsigned int count)
1006 {
1007 struct file * file;
1008 struct compat_linux_dirent __user * lastdirent;
1009 struct compat_getdents_callback buf;
1010 int error;
1011
1012 error = -EFAULT;
1013 if (!access_ok(VERIFY_WRITE, dirent, count))
1014 goto out;
1015
1016 error = -EBADF;
1017 file = fget(fd);
1018 if (!file)
1019 goto out;
1020
1021 buf.current_dir = dirent;
1022 buf.previous = NULL;
1023 buf.count = count;
1024 buf.error = 0;
1025
1026 error = vfs_readdir(file, compat_filldir, &buf);
1027 if (error < 0)
1028 goto out_putf;
1029 error = buf.error;
1030 lastdirent = buf.previous;
1031 if (lastdirent) {
1032 if (put_user(file->f_pos, &lastdirent->d_off))
1033 error = -EFAULT;
1034 else
1035 error = count - buf.count;
1036 }
1037
1038 out_putf:
1039 fput(file);
1040 out:
1041 return error;
1042 }
1043
1044 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1045 #define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
1046
1047 struct compat_getdents_callback64 {
1048 struct linux_dirent64 __user *current_dir;
1049 struct linux_dirent64 __user *previous;
1050 int count;
1051 int error;
1052 };
1053
1054 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1055 ino_t ino, unsigned int d_type)
1056 {
1057 struct linux_dirent64 __user *dirent;
1058 struct compat_getdents_callback64 *buf = __buf;
1059 int jj = NAME_OFFSET(dirent);
1060 int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
1061 u64 off;
1062
1063 buf->error = -EINVAL; /* only used if we fail.. */
1064 if (reclen > buf->count)
1065 return -EINVAL;
1066 dirent = buf->previous;
1067
1068 if (dirent) {
1069 if (__put_user_unaligned(offset, &dirent->d_off))
1070 goto efault;
1071 }
1072 dirent = buf->current_dir;
1073 if (__put_user_unaligned(ino, &dirent->d_ino))
1074 goto efault;
1075 off = 0;
1076 if (__put_user_unaligned(off, &dirent->d_off))
1077 goto efault;
1078 if (__put_user(reclen, &dirent->d_reclen))
1079 goto efault;
1080 if (__put_user(d_type, &dirent->d_type))
1081 goto efault;
1082 if (copy_to_user(dirent->d_name, name, namlen))
1083 goto efault;
1084 if (__put_user(0, dirent->d_name + namlen))
1085 goto efault;
1086 buf->previous = dirent;
1087 dirent = (void __user *)dirent + reclen;
1088 buf->current_dir = dirent;
1089 buf->count -= reclen;
1090 return 0;
1091 efault:
1092 buf->error = -EFAULT;
1093 return -EFAULT;
1094 }
1095
1096 asmlinkage long compat_sys_getdents64(unsigned int fd,
1097 struct linux_dirent64 __user * dirent, unsigned int count)
1098 {
1099 struct file * file;
1100 struct linux_dirent64 __user * lastdirent;
1101 struct compat_getdents_callback64 buf;
1102 int error;
1103
1104 error = -EFAULT;
1105 if (!access_ok(VERIFY_WRITE, dirent, count))
1106 goto out;
1107
1108 error = -EBADF;
1109 file = fget(fd);
1110 if (!file)
1111 goto out;
1112
1113 buf.current_dir = dirent;
1114 buf.previous = NULL;
1115 buf.count = count;
1116 buf.error = 0;
1117
1118 error = vfs_readdir(file, compat_filldir64, &buf);
1119 if (error < 0)
1120 goto out_putf;
1121 error = buf.error;
1122 lastdirent = buf.previous;
1123 if (lastdirent) {
1124 typeof(lastdirent->d_off) d_off = file->f_pos;
1125 __put_user_unaligned(d_off, &lastdirent->d_off);
1126 error = count - buf.count;
1127 }
1128
1129 out_putf:
1130 fput(file);
1131 out:
1132 return error;
1133 }
1134 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1135
1136 static ssize_t compat_do_readv_writev(int type, struct file *file,
1137 const struct compat_iovec __user *uvector,
1138 unsigned long nr_segs, loff_t *pos)
1139 {
1140 typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
1141 typedef ssize_t (*iov_fn_t)(struct file *, const struct iovec *, unsigned long, loff_t *);
1142
1143 compat_ssize_t tot_len;
1144 struct iovec iovstack[UIO_FASTIOV];
1145 struct iovec *iov=iovstack, *vector;
1146 ssize_t ret;
1147 int seg;
1148 io_fn_t fn;
1149 iov_fn_t fnv;
1150
1151 /*
1152 * SuS says "The readv() function *may* fail if the iovcnt argument
1153 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1154 * traditionally returned zero for zero segments, so...
1155 */
1156 ret = 0;
1157 if (nr_segs == 0)
1158 goto out;
1159
1160 /*
1161 * First get the "struct iovec" from user memory and
1162 * verify all the pointers
1163 */
1164 ret = -EINVAL;
1165 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1166 goto out;
1167 if (!file->f_op)
1168 goto out;
1169 if (nr_segs > UIO_FASTIOV) {
1170 ret = -ENOMEM;
1171 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1172 if (!iov)
1173 goto out;
1174 }
1175 ret = -EFAULT;
1176 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1177 goto out;
1178
1179 /*
1180 * Single unix specification:
1181 * We should -EINVAL if an element length is not >= 0 and fitting an
1182 * ssize_t. The total length is fitting an ssize_t
1183 *
1184 * Be careful here because iov_len is a size_t not an ssize_t
1185 */
1186 tot_len = 0;
1187 vector = iov;
1188 ret = -EINVAL;
1189 for (seg = 0 ; seg < nr_segs; seg++) {
1190 compat_ssize_t tmp = tot_len;
1191 compat_ssize_t len;
1192 compat_uptr_t buf;
1193
1194 if (__get_user(len, &uvector->iov_len) ||
1195 __get_user(buf, &uvector->iov_base)) {
1196 ret = -EFAULT;
1197 goto out;
1198 }
1199 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1200 goto out;
1201 tot_len += len;
1202 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1203 goto out;
1204 vector->iov_base = compat_ptr(buf);
1205 vector->iov_len = (compat_size_t) len;
1206 uvector++;
1207 vector++;
1208 }
1209 if (tot_len == 0) {
1210 ret = 0;
1211 goto out;
1212 }
1213
1214 ret = rw_verify_area(type, file, pos, tot_len);
1215 if (ret < 0)
1216 goto out;
1217
1218 fnv = NULL;
1219 if (type == READ) {
1220 fn = file->f_op->read;
1221 fnv = file->f_op->readv;
1222 } else {
1223 fn = (io_fn_t)file->f_op->write;
1224 fnv = file->f_op->writev;
1225 }
1226 if (fnv) {
1227 ret = fnv(file, iov, nr_segs, pos);
1228 goto out;
1229 }
1230
1231 /* Do it by hand, with file-ops */
1232 ret = 0;
1233 vector = iov;
1234 while (nr_segs > 0) {
1235 void __user * base;
1236 size_t len;
1237 ssize_t nr;
1238
1239 base = vector->iov_base;
1240 len = vector->iov_len;
1241 vector++;
1242 nr_segs--;
1243
1244 nr = fn(file, base, len, pos);
1245
1246 if (nr < 0) {
1247 if (!ret) ret = nr;
1248 break;
1249 }
1250 ret += nr;
1251 if (nr != len)
1252 break;
1253 }
1254 out:
1255 if (iov != iovstack)
1256 kfree(iov);
1257 if ((ret + (type == READ)) > 0) {
1258 struct dentry *dentry = file->f_dentry;
1259 if (type == READ)
1260 fsnotify_access(dentry);
1261 else
1262 fsnotify_modify(dentry);
1263 }
1264 return ret;
1265 }
1266
1267 asmlinkage ssize_t
1268 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1269 {
1270 struct file *file;
1271 ssize_t ret = -EBADF;
1272
1273 file = fget(fd);
1274 if (!file)
1275 return -EBADF;
1276
1277 if (!(file->f_mode & FMODE_READ))
1278 goto out;
1279
1280 ret = -EINVAL;
1281 if (!file->f_op || (!file->f_op->readv && !file->f_op->read))
1282 goto out;
1283
1284 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1285
1286 out:
1287 fput(file);
1288 return ret;
1289 }
1290
1291 asmlinkage ssize_t
1292 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1293 {
1294 struct file *file;
1295 ssize_t ret = -EBADF;
1296
1297 file = fget(fd);
1298 if (!file)
1299 return -EBADF;
1300 if (!(file->f_mode & FMODE_WRITE))
1301 goto out;
1302
1303 ret = -EINVAL;
1304 if (!file->f_op || (!file->f_op->writev && !file->f_op->write))
1305 goto out;
1306
1307 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1308
1309 out:
1310 fput(file);
1311 return ret;
1312 }
1313
1314 /*
1315 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1316 * O_LARGEFILE flag.
1317 */
1318 asmlinkage long
1319 compat_sys_open(const char __user *filename, int flags, int mode)
1320 {
1321 return do_sys_open(AT_FDCWD, filename, flags, mode);
1322 }
1323
1324 /*
1325 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1326 * O_LARGEFILE flag.
1327 */
1328 asmlinkage long
1329 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1330 {
1331 return do_sys_open(dfd, filename, flags, mode);
1332 }
1333
1334 /*
1335 * compat_count() counts the number of arguments/envelopes. It is basically
1336 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1337 * and envp pointers.
1338 */
1339 static int compat_count(compat_uptr_t __user *argv, int max)
1340 {
1341 int i = 0;
1342
1343 if (argv != NULL) {
1344 for (;;) {
1345 compat_uptr_t p;
1346
1347 if (get_user(p, argv))
1348 return -EFAULT;
1349 if (!p)
1350 break;
1351 argv++;
1352 if(++i > max)
1353 return -E2BIG;
1354 }
1355 }
1356 return i;
1357 }
1358
1359 /*
1360 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1361 * except that it works with 32 bit argv and envp pointers.
1362 */
1363 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1364 struct linux_binprm *bprm)
1365 {
1366 struct page *kmapped_page = NULL;
1367 char *kaddr = NULL;
1368 int ret;
1369
1370 while (argc-- > 0) {
1371 compat_uptr_t str;
1372 int len;
1373 unsigned long pos;
1374
1375 if (get_user(str, argv+argc) ||
1376 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1377 ret = -EFAULT;
1378 goto out;
1379 }
1380
1381 if (bprm->p < len) {
1382 ret = -E2BIG;
1383 goto out;
1384 }
1385
1386 bprm->p -= len;
1387 /* XXX: add architecture specific overflow check here. */
1388 pos = bprm->p;
1389
1390 while (len > 0) {
1391 int i, new, err;
1392 int offset, bytes_to_copy;
1393 struct page *page;
1394
1395 offset = pos % PAGE_SIZE;
1396 i = pos/PAGE_SIZE;
1397 page = bprm->page[i];
1398 new = 0;
1399 if (!page) {
1400 page = alloc_page(GFP_HIGHUSER);
1401 bprm->page[i] = page;
1402 if (!page) {
1403 ret = -ENOMEM;
1404 goto out;
1405 }
1406 new = 1;
1407 }
1408
1409 if (page != kmapped_page) {
1410 if (kmapped_page)
1411 kunmap(kmapped_page);
1412 kmapped_page = page;
1413 kaddr = kmap(kmapped_page);
1414 }
1415 if (new && offset)
1416 memset(kaddr, 0, offset);
1417 bytes_to_copy = PAGE_SIZE - offset;
1418 if (bytes_to_copy > len) {
1419 bytes_to_copy = len;
1420 if (new)
1421 memset(kaddr+offset+len, 0,
1422 PAGE_SIZE-offset-len);
1423 }
1424 err = copy_from_user(kaddr+offset, compat_ptr(str),
1425 bytes_to_copy);
1426 if (err) {
1427 ret = -EFAULT;
1428 goto out;
1429 }
1430
1431 pos += bytes_to_copy;
1432 str += bytes_to_copy;
1433 len -= bytes_to_copy;
1434 }
1435 }
1436 ret = 0;
1437 out:
1438 if (kmapped_page)
1439 kunmap(kmapped_page);
1440 return ret;
1441 }
1442
1443 #ifdef CONFIG_MMU
1444
1445 #define free_arg_pages(bprm) do { } while (0)
1446
1447 #else
1448
1449 static inline void free_arg_pages(struct linux_binprm *bprm)
1450 {
1451 int i;
1452
1453 for (i = 0; i < MAX_ARG_PAGES; i++) {
1454 if (bprm->page[i])
1455 __free_page(bprm->page[i]);
1456 bprm->page[i] = NULL;
1457 }
1458 }
1459
1460 #endif /* CONFIG_MMU */
1461
1462 /*
1463 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1464 * that it processes 32 bit argv and envp pointers.
1465 */
1466 int compat_do_execve(char * filename,
1467 compat_uptr_t __user *argv,
1468 compat_uptr_t __user *envp,
1469 struct pt_regs * regs)
1470 {
1471 struct linux_binprm *bprm;
1472 struct file *file;
1473 int retval;
1474 int i;
1475
1476 retval = -ENOMEM;
1477 bprm = kmalloc(sizeof(*bprm), GFP_KERNEL);
1478 if (!bprm)
1479 goto out_ret;
1480 memset(bprm, 0, sizeof(*bprm));
1481
1482 file = open_exec(filename);
1483 retval = PTR_ERR(file);
1484 if (IS_ERR(file))
1485 goto out_kfree;
1486
1487 sched_exec();
1488
1489 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1490 bprm->file = file;
1491 bprm->filename = filename;
1492 bprm->interp = filename;
1493 bprm->mm = mm_alloc();
1494 retval = -ENOMEM;
1495 if (!bprm->mm)
1496 goto out_file;
1497
1498 retval = init_new_context(current, bprm->mm);
1499 if (retval < 0)
1500 goto out_mm;
1501
1502 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1503 if ((retval = bprm->argc) < 0)
1504 goto out_mm;
1505
1506 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1507 if ((retval = bprm->envc) < 0)
1508 goto out_mm;
1509
1510 retval = security_bprm_alloc(bprm);
1511 if (retval)
1512 goto out;
1513
1514 retval = prepare_binprm(bprm);
1515 if (retval < 0)
1516 goto out;
1517
1518 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1519 if (retval < 0)
1520 goto out;
1521
1522 bprm->exec = bprm->p;
1523 retval = compat_copy_strings(bprm->envc, envp, bprm);
1524 if (retval < 0)
1525 goto out;
1526
1527 retval = compat_copy_strings(bprm->argc, argv, bprm);
1528 if (retval < 0)
1529 goto out;
1530
1531 retval = search_binary_handler(bprm, regs);
1532 if (retval >= 0) {
1533 free_arg_pages(bprm);
1534
1535 /* execve success */
1536 security_bprm_free(bprm);
1537 acct_update_integrals(current);
1538 kfree(bprm);
1539 return retval;
1540 }
1541
1542 out:
1543 /* Something went wrong, return the inode and free the argument pages*/
1544 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1545 struct page * page = bprm->page[i];
1546 if (page)
1547 __free_page(page);
1548 }
1549
1550 if (bprm->security)
1551 security_bprm_free(bprm);
1552
1553 out_mm:
1554 if (bprm->mm)
1555 mmdrop(bprm->mm);
1556
1557 out_file:
1558 if (bprm->file) {
1559 allow_write_access(bprm->file);
1560 fput(bprm->file);
1561 }
1562
1563 out_kfree:
1564 kfree(bprm);
1565
1566 out_ret:
1567 return retval;
1568 }
1569
1570 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1571
1572 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
1573
1574 /*
1575 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1576 * 64-bit unsigned longs.
1577 */
1578 static
1579 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1580 unsigned long *fdset)
1581 {
1582 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1583 if (ufdset) {
1584 unsigned long odd;
1585
1586 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1587 return -EFAULT;
1588
1589 odd = nr & 1UL;
1590 nr &= ~1UL;
1591 while (nr) {
1592 unsigned long h, l;
1593 __get_user(l, ufdset);
1594 __get_user(h, ufdset+1);
1595 ufdset += 2;
1596 *fdset++ = h << 32 | l;
1597 nr -= 2;
1598 }
1599 if (odd)
1600 __get_user(*fdset, ufdset);
1601 } else {
1602 /* Tricky, must clear full unsigned long in the
1603 * kernel fdset at the end, this makes sure that
1604 * actually happens.
1605 */
1606 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1607 }
1608 return 0;
1609 }
1610
1611 static
1612 void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1613 unsigned long *fdset)
1614 {
1615 unsigned long odd;
1616 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1617
1618 if (!ufdset)
1619 return;
1620
1621 odd = nr & 1UL;
1622 nr &= ~1UL;
1623 while (nr) {
1624 unsigned long h, l;
1625 l = *fdset++;
1626 h = l >> 32;
1627 __put_user(l, ufdset);
1628 __put_user(h, ufdset+1);
1629 ufdset += 2;
1630 nr -= 2;
1631 }
1632 if (odd)
1633 __put_user(*fdset, ufdset);
1634 }
1635
1636
1637 /*
1638 * This is a virtual copy of sys_select from fs/select.c and probably
1639 * should be compared to it from time to time
1640 */
1641 static void *select_bits_alloc(int size)
1642 {
1643 return kmalloc(6 * size, GFP_KERNEL);
1644 }
1645
1646 static void select_bits_free(void *bits, int size)
1647 {
1648 kfree(bits);
1649 }
1650
1651 /*
1652 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1653 * like to be certain this leads to no problems. So I return
1654 * EINTR just for safety.
1655 *
1656 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1657 * I'm trying ERESTARTNOHAND which restart only when you want to.
1658 */
1659 #define MAX_SELECT_SECONDS \
1660 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1661
1662 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1663 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1664 {
1665 fd_set_bits fds;
1666 char *bits;
1667 int size, max_fdset, ret = -EINVAL;
1668 struct fdtable *fdt;
1669
1670 if (n < 0)
1671 goto out_nofds;
1672
1673 /* max_fdset can increase, so grab it once to avoid race */
1674 rcu_read_lock();
1675 fdt = files_fdtable(current->files);
1676 max_fdset = fdt->max_fdset;
1677 rcu_read_unlock();
1678 if (n > max_fdset)
1679 n = max_fdset;
1680
1681 /*
1682 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1683 * since we used fdset we need to allocate memory in units of
1684 * long-words.
1685 */
1686 ret = -ENOMEM;
1687 size = FDS_BYTES(n);
1688 bits = select_bits_alloc(size);
1689 if (!bits)
1690 goto out_nofds;
1691 fds.in = (unsigned long *) bits;
1692 fds.out = (unsigned long *) (bits + size);
1693 fds.ex = (unsigned long *) (bits + 2*size);
1694 fds.res_in = (unsigned long *) (bits + 3*size);
1695 fds.res_out = (unsigned long *) (bits + 4*size);
1696 fds.res_ex = (unsigned long *) (bits + 5*size);
1697
1698 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1699 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1700 (ret = compat_get_fd_set(n, exp, fds.ex)))
1701 goto out;
1702 zero_fd_set(n, fds.res_in);
1703 zero_fd_set(n, fds.res_out);
1704 zero_fd_set(n, fds.res_ex);
1705
1706 ret = do_select(n, &fds, timeout);
1707
1708 if (ret < 0)
1709 goto out;
1710 if (!ret) {
1711 ret = -ERESTARTNOHAND;
1712 if (signal_pending(current))
1713 goto out;
1714 ret = 0;
1715 }
1716
1717 compat_set_fd_set(n, inp, fds.res_in);
1718 compat_set_fd_set(n, outp, fds.res_out);
1719 compat_set_fd_set(n, exp, fds.res_ex);
1720
1721 out:
1722 select_bits_free(bits, size);
1723 out_nofds:
1724 return ret;
1725 }
1726
1727 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1728 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1729 struct compat_timeval __user *tvp)
1730 {
1731 s64 timeout = -1;
1732 struct compat_timeval tv;
1733 int ret;
1734
1735 if (tvp) {
1736 if (copy_from_user(&tv, tvp, sizeof(tv)))
1737 return -EFAULT;
1738
1739 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1740 return -EINVAL;
1741
1742 /* Cast to u64 to make GCC stop complaining */
1743 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1744 timeout = -1; /* infinite */
1745 else {
1746 timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
1747 timeout += tv.tv_sec * HZ;
1748 }
1749 }
1750
1751 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1752
1753 if (tvp) {
1754 struct compat_timeval rtv;
1755
1756 if (current->personality & STICKY_TIMEOUTS)
1757 goto sticky;
1758 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1759 rtv.tv_sec = timeout;
1760 if (compat_timeval_compare(&rtv, &tv) >= 0)
1761 rtv = tv;
1762 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1763 sticky:
1764 /*
1765 * If an application puts its timeval in read-only
1766 * memory, we don't want the Linux-specific update to
1767 * the timeval to cause a fault after the select has
1768 * completed successfully. However, because we're not
1769 * updating the timeval, we can't restart the system
1770 * call.
1771 */
1772 if (ret == -ERESTARTNOHAND)
1773 ret = -EINTR;
1774 }
1775 }
1776
1777 return ret;
1778 }
1779
1780 #ifdef TIF_RESTORE_SIGMASK
1781 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1782 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1783 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1784 compat_size_t sigsetsize)
1785 {
1786 compat_sigset_t ss32;
1787 sigset_t ksigmask, sigsaved;
1788 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1789 struct compat_timespec ts;
1790 int ret;
1791
1792 if (tsp) {
1793 if (copy_from_user(&ts, tsp, sizeof(ts)))
1794 return -EFAULT;
1795
1796 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1797 return -EINVAL;
1798 }
1799
1800 if (sigmask) {
1801 if (sigsetsize != sizeof(compat_sigset_t))
1802 return -EINVAL;
1803 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1804 return -EFAULT;
1805 sigset_from_compat(&ksigmask, &ss32);
1806
1807 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1808 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1809 }
1810
1811 do {
1812 if (tsp) {
1813 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1814 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1815 timeout += ts.tv_sec * (unsigned long)HZ;
1816 ts.tv_sec = 0;
1817 ts.tv_nsec = 0;
1818 } else {
1819 ts.tv_sec -= MAX_SELECT_SECONDS;
1820 timeout = MAX_SELECT_SECONDS * HZ;
1821 }
1822 }
1823
1824 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1825
1826 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1827
1828 if (tsp && !(current->personality & STICKY_TIMEOUTS)) {
1829 struct compat_timespec rts;
1830
1831 rts.tv_sec = timeout / HZ;
1832 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1833 if (rts.tv_nsec >= NSEC_PER_SEC) {
1834 rts.tv_sec++;
1835 rts.tv_nsec -= NSEC_PER_SEC;
1836 }
1837 if (compat_timespec_compare(&rts, &ts) >= 0)
1838 rts = ts;
1839 copy_to_user(tsp, &rts, sizeof(rts));
1840 }
1841
1842 if (ret == -ERESTARTNOHAND) {
1843 /*
1844 * Don't restore the signal mask yet. Let do_signal() deliver
1845 * the signal on the way back to userspace, before the signal
1846 * mask is restored.
1847 */
1848 if (sigmask) {
1849 memcpy(&current->saved_sigmask, &sigsaved,
1850 sizeof(sigsaved));
1851 set_thread_flag(TIF_RESTORE_SIGMASK);
1852 }
1853 } else if (sigmask)
1854 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1855
1856 return ret;
1857 }
1858
1859 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1860 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1861 struct compat_timespec __user *tsp, void __user *sig)
1862 {
1863 compat_size_t sigsetsize = 0;
1864 compat_uptr_t up = 0;
1865
1866 if (sig) {
1867 if (!access_ok(VERIFY_READ, sig,
1868 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1869 __get_user(up, (compat_uptr_t __user *)sig) ||
1870 __get_user(sigsetsize,
1871 (compat_size_t __user *)(sig+sizeof(up))))
1872 return -EFAULT;
1873 }
1874 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1875 sigsetsize);
1876 }
1877
1878 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1879 unsigned int nfds, struct compat_timespec __user *tsp,
1880 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1881 {
1882 compat_sigset_t ss32;
1883 sigset_t ksigmask, sigsaved;
1884 struct compat_timespec ts;
1885 s64 timeout = -1;
1886 int ret;
1887
1888 if (tsp) {
1889 if (copy_from_user(&ts, tsp, sizeof(ts)))
1890 return -EFAULT;
1891
1892 /* We assume that ts.tv_sec is always lower than
1893 the number of seconds that can be expressed in
1894 an s64. Otherwise the compiler bitches at us */
1895 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1896 timeout += ts.tv_sec * HZ;
1897 }
1898
1899 if (sigmask) {
1900 if (sigsetsize |= sizeof(compat_sigset_t))
1901 return -EINVAL;
1902 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1903 return -EFAULT;
1904 sigset_from_compat(&ksigmask, &ss32);
1905
1906 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1907 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1908 }
1909
1910 ret = do_sys_poll(ufds, nfds, &timeout);
1911
1912 /* We can restart this syscall, usually */
1913 if (ret == -EINTR) {
1914 /*
1915 * Don't restore the signal mask yet. Let do_signal() deliver
1916 * the signal on the way back to userspace, before the signal
1917 * mask is restored.
1918 */
1919 if (sigmask) {
1920 memcpy(&current->saved_sigmask, &sigsaved,
1921 sizeof(sigsaved));
1922 set_thread_flag(TIF_RESTORE_SIGMASK);
1923 }
1924 ret = -ERESTARTNOHAND;
1925 } else if (sigmask)
1926 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1927
1928 if (tsp && timeout >= 0) {
1929 struct compat_timespec rts;
1930
1931 if (current->personality & STICKY_TIMEOUTS)
1932 goto sticky;
1933 /* Yes, we know it's actually an s64, but it's also positive. */
1934 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1935 1000;
1936 rts.tv_sec = timeout;
1937 if (compat_timespec_compare(&rts, &ts) >= 0)
1938 rts = ts;
1939 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1940 sticky:
1941 /*
1942 * If an application puts its timeval in read-only
1943 * memory, we don't want the Linux-specific update to
1944 * the timeval to cause a fault after the select has
1945 * completed successfully. However, because we're not
1946 * updating the timeval, we can't restart the system
1947 * call.
1948 */
1949 if (ret == -ERESTARTNOHAND && timeout >= 0)
1950 ret = -EINTR;
1951 }
1952 }
1953
1954 return ret;
1955 }
1956 #endif /* TIF_RESTORE_SIGMASK */
1957
1958 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1959 /* Stuff for NFS server syscalls... */
1960 struct compat_nfsctl_svc {
1961 u16 svc32_port;
1962 s32 svc32_nthreads;
1963 };
1964
1965 struct compat_nfsctl_client {
1966 s8 cl32_ident[NFSCLNT_IDMAX+1];
1967 s32 cl32_naddr;
1968 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1969 s32 cl32_fhkeytype;
1970 s32 cl32_fhkeylen;
1971 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1972 };
1973
1974 struct compat_nfsctl_export {
1975 char ex32_client[NFSCLNT_IDMAX+1];
1976 char ex32_path[NFS_MAXPATHLEN+1];
1977 compat_dev_t ex32_dev;
1978 compat_ino_t ex32_ino;
1979 compat_int_t ex32_flags;
1980 __compat_uid_t ex32_anon_uid;
1981 __compat_gid_t ex32_anon_gid;
1982 };
1983
1984 struct compat_nfsctl_fdparm {
1985 struct sockaddr gd32_addr;
1986 s8 gd32_path[NFS_MAXPATHLEN+1];
1987 compat_int_t gd32_version;
1988 };
1989
1990 struct compat_nfsctl_fsparm {
1991 struct sockaddr gd32_addr;
1992 s8 gd32_path[NFS_MAXPATHLEN+1];
1993 compat_int_t gd32_maxlen;
1994 };
1995
1996 struct compat_nfsctl_arg {
1997 compat_int_t ca32_version; /* safeguard */
1998 union {
1999 struct compat_nfsctl_svc u32_svc;
2000 struct compat_nfsctl_client u32_client;
2001 struct compat_nfsctl_export u32_export;
2002 struct compat_nfsctl_fdparm u32_getfd;
2003 struct compat_nfsctl_fsparm u32_getfs;
2004 } u;
2005 #define ca32_svc u.u32_svc
2006 #define ca32_client u.u32_client
2007 #define ca32_export u.u32_export
2008 #define ca32_getfd u.u32_getfd
2009 #define ca32_getfs u.u32_getfs
2010 };
2011
2012 union compat_nfsctl_res {
2013 __u8 cr32_getfh[NFS_FHSIZE];
2014 struct knfsd_fh cr32_getfs;
2015 };
2016
2017 static int compat_nfs_svc_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
2018 {
2019 int err;
2020
2021 err = access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc));
2022 err |= get_user(karg->ca_version, &arg->ca32_version);
2023 err |= __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port);
2024 err |= __get_user(karg->ca_svc.svc_nthreads, &arg->ca32_svc.svc32_nthreads);
2025 return (err) ? -EFAULT : 0;
2026 }
2027
2028 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
2029 {
2030 int err;
2031
2032 err = access_ok(VERIFY_READ, &arg->ca32_client, sizeof(arg->ca32_client));
2033 err |= get_user(karg->ca_version, &arg->ca32_version);
2034 err |= __copy_from_user(&karg->ca_client.cl_ident[0],
2035 &arg->ca32_client.cl32_ident[0],
2036 NFSCLNT_IDMAX);
2037 err |= __get_user(karg->ca_client.cl_naddr, &arg->ca32_client.cl32_naddr);
2038 err |= __copy_from_user(&karg->ca_client.cl_addrlist[0],
2039 &arg->ca32_client.cl32_addrlist[0],
2040 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX));
2041 err |= __get_user(karg->ca_client.cl_fhkeytype,
2042 &arg->ca32_client.cl32_fhkeytype);
2043 err |= __get_user(karg->ca_client.cl_fhkeylen,
2044 &arg->ca32_client.cl32_fhkeylen);
2045 err |= __copy_from_user(&karg->ca_client.cl_fhkey[0],
2046 &arg->ca32_client.cl32_fhkey[0],
2047 NFSCLNT_KEYMAX);
2048
2049 return (err) ? -EFAULT : 0;
2050 }
2051
2052 static int compat_nfs_exp_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
2053 {
2054 int err;
2055
2056 err = access_ok(VERIFY_READ, &arg->ca32_export, sizeof(arg->ca32_export));
2057 err |= get_user(karg->ca_version, &arg->ca32_version);
2058 err |= __copy_from_user(&karg->ca_export.ex_client[0],
2059 &arg->ca32_export.ex32_client[0],
2060 NFSCLNT_IDMAX);
2061 err |= __copy_from_user(&karg->ca_export.ex_path[0],
2062 &arg->ca32_export.ex32_path[0],
2063 NFS_MAXPATHLEN);
2064 err |= __get_user(karg->ca_export.ex_dev,
2065 &arg->ca32_export.ex32_dev);
2066 err |= __get_user(karg->ca_export.ex_ino,
2067 &arg->ca32_export.ex32_ino);
2068 err |= __get_user(karg->ca_export.ex_flags,
2069 &arg->ca32_export.ex32_flags);
2070 err |= __get_user(karg->ca_export.ex_anon_uid,
2071 &arg->ca32_export.ex32_anon_uid);
2072 err |= __get_user(karg->ca_export.ex_anon_gid,
2073 &arg->ca32_export.ex32_anon_gid);
2074 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2075 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2076
2077 return (err) ? -EFAULT : 0;
2078 }
2079
2080 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
2081 {
2082 int err;
2083
2084 err = access_ok(VERIFY_READ, &arg->ca32_getfd, sizeof(arg->ca32_getfd));
2085 err |= get_user(karg->ca_version, &arg->ca32_version);
2086 err |= __copy_from_user(&karg->ca_getfd.gd_addr,
2087 &arg->ca32_getfd.gd32_addr,
2088 (sizeof(struct sockaddr)));
2089 err |= __copy_from_user(&karg->ca_getfd.gd_path,
2090 &arg->ca32_getfd.gd32_path,
2091 (NFS_MAXPATHLEN+1));
2092 err |= __get_user(karg->ca_getfd.gd_version,
2093 &arg->ca32_getfd.gd32_version);
2094
2095 return (err) ? -EFAULT : 0;
2096 }
2097
2098 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
2099 {
2100 int err;
2101
2102 err = access_ok(VERIFY_READ, &arg->ca32_getfs, sizeof(arg->ca32_getfs));
2103 err |= get_user(karg->ca_version, &arg->ca32_version);
2104 err |= __copy_from_user(&karg->ca_getfs.gd_addr,
2105 &arg->ca32_getfs.gd32_addr,
2106 (sizeof(struct sockaddr)));
2107 err |= __copy_from_user(&karg->ca_getfs.gd_path,
2108 &arg->ca32_getfs.gd32_path,
2109 (NFS_MAXPATHLEN+1));
2110 err |= __get_user(karg->ca_getfs.gd_maxlen,
2111 &arg->ca32_getfs.gd32_maxlen);
2112
2113 return (err) ? -EFAULT : 0;
2114 }
2115
2116 /* This really doesn't need translations, we are only passing
2117 * back a union which contains opaque nfs file handle data.
2118 */
2119 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, union compat_nfsctl_res __user *res)
2120 {
2121 int err;
2122
2123 err = copy_to_user(res, kres, sizeof(*res));
2124
2125 return (err) ? -EFAULT : 0;
2126 }
2127
2128 asmlinkage long compat_sys_nfsservctl(int cmd, struct compat_nfsctl_arg __user *arg,
2129 union compat_nfsctl_res __user *res)
2130 {
2131 struct nfsctl_arg *karg;
2132 union nfsctl_res *kres;
2133 mm_segment_t oldfs;
2134 int err;
2135
2136 karg = kmalloc(sizeof(*karg), GFP_USER);
2137 kres = kmalloc(sizeof(*kres), GFP_USER);
2138 if(!karg || !kres) {
2139 err = -ENOMEM;
2140 goto done;
2141 }
2142
2143 switch(cmd) {
2144 case NFSCTL_SVC:
2145 err = compat_nfs_svc_trans(karg, arg);
2146 break;
2147
2148 case NFSCTL_ADDCLIENT:
2149 err = compat_nfs_clnt_trans(karg, arg);
2150 break;
2151
2152 case NFSCTL_DELCLIENT:
2153 err = compat_nfs_clnt_trans(karg, arg);
2154 break;
2155
2156 case NFSCTL_EXPORT:
2157 case NFSCTL_UNEXPORT:
2158 err = compat_nfs_exp_trans(karg, arg);
2159 break;
2160
2161 case NFSCTL_GETFD:
2162 err = compat_nfs_getfd_trans(karg, arg);
2163 break;
2164
2165 case NFSCTL_GETFS:
2166 err = compat_nfs_getfs_trans(karg, arg);
2167 break;
2168
2169 default:
2170 err = -EINVAL;
2171 goto done;
2172 }
2173
2174 oldfs = get_fs();
2175 set_fs(KERNEL_DS);
2176 /* The __user pointer casts are valid because of the set_fs() */
2177 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2178 set_fs(oldfs);
2179
2180 if (err)
2181 goto done;
2182
2183 if((cmd == NFSCTL_GETFD) ||
2184 (cmd == NFSCTL_GETFS))
2185 err = compat_nfs_getfh_res_trans(kres, res);
2186
2187 done:
2188 kfree(karg);
2189 kfree(kres);
2190 return err;
2191 }
2192 #else /* !NFSD */
2193 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2194 {
2195 return sys_ni_syscall();
2196 }
2197 #endif
WandBoard kernel