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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / fs / compat.c
blob1c859dae758f8a01efa3e1e793bcfffc42fce604
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/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
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/security.h>
49 #include <linux/highmem.h>
50 #include <linux/signal.h>
51 #include <linux/poll.h>
52 #include <linux/mm.h>
53 #include <linux/eventpoll.h>
54 #include <linux/fs_struct.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/mmu_context.h>
58 #include <asm/ioctls.h>
59 #include "internal.h"
60
61 int compat_log = 1;
62
63 int compat_printk(const char *fmt, ...)
64 {
65 va_list ap;
66 int ret;
67 if (!compat_log)
68 return 0;
69 va_start(ap, fmt);
70 ret = vprintk(fmt, ap);
71 va_end(ap);
72 return ret;
73 }
74
75 #include "read_write.h"
76
77 /*
78 * Not all architectures have sys_utime, so implement this in terms
79 * of sys_utimes.
80 */
81 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
82 {
83 struct timespec tv[2];
84
85 if (t) {
86 if (get_user(tv[0].tv_sec, &t->actime) ||
87 get_user(tv[1].tv_sec, &t->modtime))
88 return -EFAULT;
89 tv[0].tv_nsec = 0;
90 tv[1].tv_nsec = 0;
91 }
92 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
93 }
94
95 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
96 {
97 struct timespec tv[2];
98
99 if (t) {
100 if (get_compat_timespec(&tv[0], &t[0]) ||
101 get_compat_timespec(&tv[1], &t[1]))
102 return -EFAULT;
103
104 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
105 && tv[0].tv_sec != 0)
106 return -EINVAL;
107 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
108 && tv[1].tv_sec != 0)
109 return -EINVAL;
110
111 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
112 return 0;
113 }
114 return do_utimes(dfd, filename, t ? tv : NULL, flags);
115 }
116
117 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
118 {
119 struct timespec tv[2];
120
121 if (t) {
122 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
123 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
124 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
125 get_user(tv[1].tv_nsec, &t[1].tv_usec))
126 return -EFAULT;
127 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
128 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
129 return -EINVAL;
130 tv[0].tv_nsec *= 1000;
131 tv[1].tv_nsec *= 1000;
132 }
133 return do_utimes(dfd, filename, t ? tv : NULL, 0);
134 }
135
136 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
137 {
138 return compat_sys_futimesat(AT_FDCWD, filename, t);
139 }
140
141 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
142 {
143 compat_ino_t ino = stat->ino;
144 typeof(ubuf->st_uid) uid = 0;
145 typeof(ubuf->st_gid) gid = 0;
146 int err;
147
148 SET_UID(uid, stat->uid);
149 SET_GID(gid, stat->gid);
150
151 if ((u64) stat->size > MAX_NON_LFS ||
152 !old_valid_dev(stat->dev) ||
153 !old_valid_dev(stat->rdev))
154 return -EOVERFLOW;
155 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
156 return -EOVERFLOW;
157
158 if (clear_user(ubuf, sizeof(*ubuf)))
159 return -EFAULT;
160
161 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
162 err |= __put_user(ino, &ubuf->st_ino);
163 err |= __put_user(stat->mode, &ubuf->st_mode);
164 err |= __put_user(stat->nlink, &ubuf->st_nlink);
165 err |= __put_user(uid, &ubuf->st_uid);
166 err |= __put_user(gid, &ubuf->st_gid);
167 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
168 err |= __put_user(stat->size, &ubuf->st_size);
169 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
170 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
171 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
172 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
173 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
174 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
175 err |= __put_user(stat->blksize, &ubuf->st_blksize);
176 err |= __put_user(stat->blocks, &ubuf->st_blocks);
177 return err;
178 }
179
180 asmlinkage long compat_sys_newstat(char __user * filename,
181 struct compat_stat __user *statbuf)
182 {
183 struct kstat stat;
184 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
185
186 if (!error)
187 error = cp_compat_stat(&stat, statbuf);
188 return error;
189 }
190
191 asmlinkage long compat_sys_newlstat(char __user * filename,
192 struct compat_stat __user *statbuf)
193 {
194 struct kstat stat;
195 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
196
197 if (!error)
198 error = cp_compat_stat(&stat, statbuf);
199 return error;
200 }
201
202 #ifndef __ARCH_WANT_STAT64
203 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
204 struct compat_stat __user *statbuf, int flag)
205 {
206 struct kstat stat;
207 int error = -EINVAL;
208
209 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
210 goto out;
211
212 if (flag & AT_SYMLINK_NOFOLLOW)
213 error = vfs_lstat_fd(dfd, filename, &stat);
214 else
215 error = vfs_stat_fd(dfd, filename, &stat);
216
217 if (!error)
218 error = cp_compat_stat(&stat, statbuf);
219
220 out:
221 return error;
222 }
223 #endif
224
225 asmlinkage long compat_sys_newfstat(unsigned int fd,
226 struct compat_stat __user * statbuf)
227 {
228 struct kstat stat;
229 int error = vfs_fstat(fd, &stat);
230
231 if (!error)
232 error = cp_compat_stat(&stat, statbuf);
233 return error;
234 }
235
236 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
237 {
238
239 if (sizeof ubuf->f_blocks == 4) {
240 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
241 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
242 return -EOVERFLOW;
243 /* f_files and f_ffree may be -1; it's okay
244 * to stuff that into 32 bits */
245 if (kbuf->f_files != 0xffffffffffffffffULL
246 && (kbuf->f_files & 0xffffffff00000000ULL))
247 return -EOVERFLOW;
248 if (kbuf->f_ffree != 0xffffffffffffffffULL
249 && (kbuf->f_ffree & 0xffffffff00000000ULL))
250 return -EOVERFLOW;
251 }
252 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
253 __put_user(kbuf->f_type, &ubuf->f_type) ||
254 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
255 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
256 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
257 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
258 __put_user(kbuf->f_files, &ubuf->f_files) ||
259 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
260 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
261 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
262 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
263 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
264 __put_user(0, &ubuf->f_spare[0]) ||
265 __put_user(0, &ubuf->f_spare[1]) ||
266 __put_user(0, &ubuf->f_spare[2]) ||
267 __put_user(0, &ubuf->f_spare[3]) ||
268 __put_user(0, &ubuf->f_spare[4]))
269 return -EFAULT;
270 return 0;
271 }
272
273 /*
274 * The following statfs calls are copies of code from fs/open.c and
275 * should be checked against those from time to time
276 */
277 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
278 {
279 struct path path;
280 int error;
281
282 error = user_path(pathname, &path);
283 if (!error) {
284 struct kstatfs tmp;
285 error = vfs_statfs(path.dentry, &tmp);
286 if (!error)
287 error = put_compat_statfs(buf, &tmp);
288 path_put(&path);
289 }
290 return error;
291 }
292
293 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
294 {
295 struct file * file;
296 struct kstatfs tmp;
297 int error;
298
299 error = -EBADF;
300 file = fget(fd);
301 if (!file)
302 goto out;
303 error = vfs_statfs(file->f_path.dentry, &tmp);
304 if (!error)
305 error = put_compat_statfs(buf, &tmp);
306 fput(file);
307 out:
308 return error;
309 }
310
311 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
312 {
313 if (sizeof ubuf->f_blocks == 4) {
314 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
315 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
316 return -EOVERFLOW;
317 /* f_files and f_ffree may be -1; it's okay
318 * to stuff that into 32 bits */
319 if (kbuf->f_files != 0xffffffffffffffffULL
320 && (kbuf->f_files & 0xffffffff00000000ULL))
321 return -EOVERFLOW;
322 if (kbuf->f_ffree != 0xffffffffffffffffULL
323 && (kbuf->f_ffree & 0xffffffff00000000ULL))
324 return -EOVERFLOW;
325 }
326 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
327 __put_user(kbuf->f_type, &ubuf->f_type) ||
328 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
329 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
330 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
331 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
332 __put_user(kbuf->f_files, &ubuf->f_files) ||
333 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
334 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
335 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
336 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
337 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
338 return -EFAULT;
339 return 0;
340 }
341
342 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
343 {
344 struct path path;
345 int error;
346
347 if (sz != sizeof(*buf))
348 return -EINVAL;
349
350 error = user_path(pathname, &path);
351 if (!error) {
352 struct kstatfs tmp;
353 error = vfs_statfs(path.dentry, &tmp);
354 if (!error)
355 error = put_compat_statfs64(buf, &tmp);
356 path_put(&path);
357 }
358 return error;
359 }
360
361 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
362 {
363 struct file * file;
364 struct kstatfs tmp;
365 int error;
366
367 if (sz != sizeof(*buf))
368 return -EINVAL;
369
370 error = -EBADF;
371 file = fget(fd);
372 if (!file)
373 goto out;
374 error = vfs_statfs(file->f_path.dentry, &tmp);
375 if (!error)
376 error = put_compat_statfs64(buf, &tmp);
377 fput(file);
378 out:
379 return error;
380 }
381
382 /*
383 * This is a copy of sys_ustat, just dealing with a structure layout.
384 * Given how simple this syscall is that apporach is more maintainable
385 * than the various conversion hacks.
386 */
387 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
388 {
389 struct super_block *sb;
390 struct compat_ustat tmp;
391 struct kstatfs sbuf;
392 int err;
393
394 sb = user_get_super(new_decode_dev(dev));
395 if (!sb)
396 return -EINVAL;
397 err = vfs_statfs(sb->s_root, &sbuf);
398 drop_super(sb);
399 if (err)
400 return err;
401
402 memset(&tmp, 0, sizeof(struct compat_ustat));
403 tmp.f_tfree = sbuf.f_bfree;
404 tmp.f_tinode = sbuf.f_ffree;
405 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
406 return -EFAULT;
407 return 0;
408 }
409
410 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
411 {
412 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
413 __get_user(kfl->l_type, &ufl->l_type) ||
414 __get_user(kfl->l_whence, &ufl->l_whence) ||
415 __get_user(kfl->l_start, &ufl->l_start) ||
416 __get_user(kfl->l_len, &ufl->l_len) ||
417 __get_user(kfl->l_pid, &ufl->l_pid))
418 return -EFAULT;
419 return 0;
420 }
421
422 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
423 {
424 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
425 __put_user(kfl->l_type, &ufl->l_type) ||
426 __put_user(kfl->l_whence, &ufl->l_whence) ||
427 __put_user(kfl->l_start, &ufl->l_start) ||
428 __put_user(kfl->l_len, &ufl->l_len) ||
429 __put_user(kfl->l_pid, &ufl->l_pid))
430 return -EFAULT;
431 return 0;
432 }
433
434 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
435 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
436 {
437 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
438 __get_user(kfl->l_type, &ufl->l_type) ||
439 __get_user(kfl->l_whence, &ufl->l_whence) ||
440 __get_user(kfl->l_start, &ufl->l_start) ||
441 __get_user(kfl->l_len, &ufl->l_len) ||
442 __get_user(kfl->l_pid, &ufl->l_pid))
443 return -EFAULT;
444 return 0;
445 }
446 #endif
447
448 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
449 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
450 {
451 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
452 __put_user(kfl->l_type, &ufl->l_type) ||
453 __put_user(kfl->l_whence, &ufl->l_whence) ||
454 __put_user(kfl->l_start, &ufl->l_start) ||
455 __put_user(kfl->l_len, &ufl->l_len) ||
456 __put_user(kfl->l_pid, &ufl->l_pid))
457 return -EFAULT;
458 return 0;
459 }
460 #endif
461
462 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
463 unsigned long arg)
464 {
465 mm_segment_t old_fs;
466 struct flock f;
467 long ret;
468
469 switch (cmd) {
470 case F_GETLK:
471 case F_SETLK:
472 case F_SETLKW:
473 ret = get_compat_flock(&f, compat_ptr(arg));
474 if (ret != 0)
475 break;
476 old_fs = get_fs();
477 set_fs(KERNEL_DS);
478 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
479 set_fs(old_fs);
480 if (cmd == F_GETLK && ret == 0) {
481 /* GETLK was successfule and we need to return the data...
482 * but it needs to fit in the compat structure.
483 * l_start shouldn't be too big, unless the original
484 * start + end is greater than COMPAT_OFF_T_MAX, in which
485 * case the app was asking for trouble, so we return
486 * -EOVERFLOW in that case.
487 * l_len could be too big, in which case we just truncate it,
488 * and only allow the app to see that part of the conflicting
489 * lock that might make sense to it anyway
490 */
491
492 if (f.l_start > COMPAT_OFF_T_MAX)
493 ret = -EOVERFLOW;
494 if (f.l_len > COMPAT_OFF_T_MAX)
495 f.l_len = COMPAT_OFF_T_MAX;
496 if (ret == 0)
497 ret = put_compat_flock(&f, compat_ptr(arg));
498 }
499 break;
500
501 case F_GETLK64:
502 case F_SETLK64:
503 case F_SETLKW64:
504 ret = get_compat_flock64(&f, compat_ptr(arg));
505 if (ret != 0)
506 break;
507 old_fs = get_fs();
508 set_fs(KERNEL_DS);
509 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
510 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
511 (unsigned long)&f);
512 set_fs(old_fs);
513 if (cmd == F_GETLK64 && ret == 0) {
514 /* need to return lock information - see above for commentary */
515 if (f.l_start > COMPAT_LOFF_T_MAX)
516 ret = -EOVERFLOW;
517 if (f.l_len > COMPAT_LOFF_T_MAX)
518 f.l_len = COMPAT_LOFF_T_MAX;
519 if (ret == 0)
520 ret = put_compat_flock64(&f, compat_ptr(arg));
521 }
522 break;
523
524 default:
525 ret = sys_fcntl(fd, cmd, arg);
526 break;
527 }
528 return ret;
529 }
530
531 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
532 unsigned long arg)
533 {
534 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
535 return -EINVAL;
536 return compat_sys_fcntl64(fd, cmd, arg);
537 }
538
539 asmlinkage long
540 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
541 {
542 long ret;
543 aio_context_t ctx64;
544
545 mm_segment_t oldfs = get_fs();
546 if (unlikely(get_user(ctx64, ctx32p)))
547 return -EFAULT;
548
549 set_fs(KERNEL_DS);
550 /* The __user pointer cast is valid because of the set_fs() */
551 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
552 set_fs(oldfs);
553 /* truncating is ok because it's a user address */
554 if (!ret)
555 ret = put_user((u32) ctx64, ctx32p);
556 return ret;
557 }
558
559 asmlinkage long
560 compat_sys_io_getevents(aio_context_t ctx_id,
561 unsigned long min_nr,
562 unsigned long nr,
563 struct io_event __user *events,
564 struct compat_timespec __user *timeout)
565 {
566 long ret;
567 struct timespec t;
568 struct timespec __user *ut = NULL;
569
570 ret = -EFAULT;
571 if (unlikely(!access_ok(VERIFY_WRITE, events,
572 nr * sizeof(struct io_event))))
573 goto out;
574 if (timeout) {
575 if (get_compat_timespec(&t, timeout))
576 goto out;
577
578 ut = compat_alloc_user_space(sizeof(*ut));
579 if (copy_to_user(ut, &t, sizeof(t)) )
580 goto out;
581 }
582 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
583 out:
584 return ret;
585 }
586
587 static inline long
588 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
589 {
590 compat_uptr_t uptr;
591 int i;
592
593 for (i = 0; i < nr; ++i) {
594 if (get_user(uptr, ptr32 + i))
595 return -EFAULT;
596 if (put_user(compat_ptr(uptr), ptr64 + i))
597 return -EFAULT;
598 }
599 return 0;
600 }
601
602 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
603
604 asmlinkage long
605 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
606 {
607 struct iocb __user * __user *iocb64;
608 long ret;
609
610 if (unlikely(nr < 0))
611 return -EINVAL;
612
613 if (nr > MAX_AIO_SUBMITS)
614 nr = MAX_AIO_SUBMITS;
615
616 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
617 ret = copy_iocb(nr, iocb, iocb64);
618 if (!ret)
619 ret = sys_io_submit(ctx_id, nr, iocb64);
620 return ret;
621 }
622
623 struct compat_ncp_mount_data {
624 compat_int_t version;
625 compat_uint_t ncp_fd;
626 __compat_uid_t mounted_uid;
627 compat_pid_t wdog_pid;
628 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
629 compat_uint_t time_out;
630 compat_uint_t retry_count;
631 compat_uint_t flags;
632 __compat_uid_t uid;
633 __compat_gid_t gid;
634 compat_mode_t file_mode;
635 compat_mode_t dir_mode;
636 };
637
638 struct compat_ncp_mount_data_v4 {
639 compat_int_t version;
640 compat_ulong_t flags;
641 compat_ulong_t mounted_uid;
642 compat_long_t wdog_pid;
643 compat_uint_t ncp_fd;
644 compat_uint_t time_out;
645 compat_uint_t retry_count;
646 compat_ulong_t uid;
647 compat_ulong_t gid;
648 compat_ulong_t file_mode;
649 compat_ulong_t dir_mode;
650 };
651
652 static void *do_ncp_super_data_conv(void *raw_data)
653 {
654 int version = *(unsigned int *)raw_data;
655
656 if (version == 3) {
657 struct compat_ncp_mount_data *c_n = raw_data;
658 struct ncp_mount_data *n = raw_data;
659
660 n->dir_mode = c_n->dir_mode;
661 n->file_mode = c_n->file_mode;
662 n->gid = c_n->gid;
663 n->uid = c_n->uid;
664 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
665 n->wdog_pid = c_n->wdog_pid;
666 n->mounted_uid = c_n->mounted_uid;
667 } else if (version == 4) {
668 struct compat_ncp_mount_data_v4 *c_n = raw_data;
669 struct ncp_mount_data_v4 *n = raw_data;
670
671 n->dir_mode = c_n->dir_mode;
672 n->file_mode = c_n->file_mode;
673 n->gid = c_n->gid;
674 n->uid = c_n->uid;
675 n->retry_count = c_n->retry_count;
676 n->time_out = c_n->time_out;
677 n->ncp_fd = c_n->ncp_fd;
678 n->wdog_pid = c_n->wdog_pid;
679 n->mounted_uid = c_n->mounted_uid;
680 n->flags = c_n->flags;
681 } else if (version != 5) {
682 return NULL;
683 }
684
685 return raw_data;
686 }
687
688 struct compat_smb_mount_data {
689 compat_int_t version;
690 __compat_uid_t mounted_uid;
691 __compat_uid_t uid;
692 __compat_gid_t gid;
693 compat_mode_t file_mode;
694 compat_mode_t dir_mode;
695 };
696
697 static void *do_smb_super_data_conv(void *raw_data)
698 {
699 struct smb_mount_data *s = raw_data;
700 struct compat_smb_mount_data *c_s = raw_data;
701
702 if (c_s->version != SMB_MOUNT_OLDVERSION)
703 goto out;
704 s->dir_mode = c_s->dir_mode;
705 s->file_mode = c_s->file_mode;
706 s->gid = c_s->gid;
707 s->uid = c_s->uid;
708 s->mounted_uid = c_s->mounted_uid;
709 out:
710 return raw_data;
711 }
712
713 struct compat_nfs_string {
714 compat_uint_t len;
715 compat_uptr_t data;
716 };
717
718 static inline void compat_nfs_string(struct nfs_string *dst,
719 struct compat_nfs_string *src)
720 {
721 dst->data = compat_ptr(src->data);
722 dst->len = src->len;
723 }
724
725 struct compat_nfs4_mount_data_v1 {
726 compat_int_t version;
727 compat_int_t flags;
728 compat_int_t rsize;
729 compat_int_t wsize;
730 compat_int_t timeo;
731 compat_int_t retrans;
732 compat_int_t acregmin;
733 compat_int_t acregmax;
734 compat_int_t acdirmin;
735 compat_int_t acdirmax;
736 struct compat_nfs_string client_addr;
737 struct compat_nfs_string mnt_path;
738 struct compat_nfs_string hostname;
739 compat_uint_t host_addrlen;
740 compat_uptr_t host_addr;
741 compat_int_t proto;
742 compat_int_t auth_flavourlen;
743 compat_uptr_t auth_flavours;
744 };
745
746 static int do_nfs4_super_data_conv(void *raw_data)
747 {
748 int version = *(compat_uint_t *) raw_data;
749
750 if (version == 1) {
751 struct compat_nfs4_mount_data_v1 *raw = raw_data;
752 struct nfs4_mount_data *real = raw_data;
753
754 /* copy the fields backwards */
755 real->auth_flavours = compat_ptr(raw->auth_flavours);
756 real->auth_flavourlen = raw->auth_flavourlen;
757 real->proto = raw->proto;
758 real->host_addr = compat_ptr(raw->host_addr);
759 real->host_addrlen = raw->host_addrlen;
760 compat_nfs_string(&real->hostname, &raw->hostname);
761 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
762 compat_nfs_string(&real->client_addr, &raw->client_addr);
763 real->acdirmax = raw->acdirmax;
764 real->acdirmin = raw->acdirmin;
765 real->acregmax = raw->acregmax;
766 real->acregmin = raw->acregmin;
767 real->retrans = raw->retrans;
768 real->timeo = raw->timeo;
769 real->wsize = raw->wsize;
770 real->rsize = raw->rsize;
771 real->flags = raw->flags;
772 real->version = raw->version;
773 }
774
775 return 0;
776 }
777
778 #define SMBFS_NAME "smbfs"
779 #define NCPFS_NAME "ncpfs"
780 #define NFS4_NAME "nfs4"
781
782 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
783 char __user * type, unsigned long flags,
784 void __user * data)
785 {
786 unsigned long type_page;
787 unsigned long data_page;
788 unsigned long dev_page;
789 char *dir_page;
790 int retval;
791
792 retval = copy_mount_options (type, &type_page);
793 if (retval < 0)
794 goto out;
795
796 dir_page = getname(dir_name);
797 retval = PTR_ERR(dir_page);
798 if (IS_ERR(dir_page))
799 goto out1;
800
801 retval = copy_mount_options (dev_name, &dev_page);
802 if (retval < 0)
803 goto out2;
804
805 retval = copy_mount_options (data, &data_page);
806 if (retval < 0)
807 goto out3;
808
809 retval = -EINVAL;
810
811 if (type_page && data_page) {
812 if (!strcmp((char *)type_page, SMBFS_NAME)) {
813 do_smb_super_data_conv((void *)data_page);
814 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
815 do_ncp_super_data_conv((void *)data_page);
816 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
817 if (do_nfs4_super_data_conv((void *) data_page))
818 goto out4;
819 }
820 }
821
822 lock_kernel();
823 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
824 flags, (void*)data_page);
825 unlock_kernel();
826
827 out4:
828 free_page(data_page);
829 out3:
830 free_page(dev_page);
831 out2:
832 putname(dir_page);
833 out1:
834 free_page(type_page);
835 out:
836 return retval;
837 }
838
839 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
840
841 struct compat_old_linux_dirent {
842 compat_ulong_t d_ino;
843 compat_ulong_t d_offset;
844 unsigned short d_namlen;
845 char d_name[1];
846 };
847
848 struct compat_readdir_callback {
849 struct compat_old_linux_dirent __user *dirent;
850 int result;
851 };
852
853 static int compat_fillonedir(void *__buf, const char *name, int namlen,
854 loff_t offset, u64 ino, unsigned int d_type)
855 {
856 struct compat_readdir_callback *buf = __buf;
857 struct compat_old_linux_dirent __user *dirent;
858 compat_ulong_t d_ino;
859
860 if (buf->result)
861 return -EINVAL;
862 d_ino = ino;
863 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
864 buf->result = -EOVERFLOW;
865 return -EOVERFLOW;
866 }
867 buf->result++;
868 dirent = buf->dirent;
869 if (!access_ok(VERIFY_WRITE, dirent,
870 (unsigned long)(dirent->d_name + namlen + 1) -
871 (unsigned long)dirent))
872 goto efault;
873 if ( __put_user(d_ino, &dirent->d_ino) ||
874 __put_user(offset, &dirent->d_offset) ||
875 __put_user(namlen, &dirent->d_namlen) ||
876 __copy_to_user(dirent->d_name, name, namlen) ||
877 __put_user(0, dirent->d_name + namlen))
878 goto efault;
879 return 0;
880 efault:
881 buf->result = -EFAULT;
882 return -EFAULT;
883 }
884
885 asmlinkage long compat_sys_old_readdir(unsigned int fd,
886 struct compat_old_linux_dirent __user *dirent, unsigned int count)
887 {
888 int error;
889 struct file *file;
890 struct compat_readdir_callback buf;
891
892 error = -EBADF;
893 file = fget(fd);
894 if (!file)
895 goto out;
896
897 buf.result = 0;
898 buf.dirent = dirent;
899
900 error = vfs_readdir(file, compat_fillonedir, &buf);
901 if (buf.result)
902 error = buf.result;
903
904 fput(file);
905 out:
906 return error;
907 }
908
909 struct compat_linux_dirent {
910 compat_ulong_t d_ino;
911 compat_ulong_t d_off;
912 unsigned short d_reclen;
913 char d_name[1];
914 };
915
916 struct compat_getdents_callback {
917 struct compat_linux_dirent __user *current_dir;
918 struct compat_linux_dirent __user *previous;
919 int count;
920 int error;
921 };
922
923 static int compat_filldir(void *__buf, const char *name, int namlen,
924 loff_t offset, u64 ino, unsigned int d_type)
925 {
926 struct compat_linux_dirent __user * dirent;
927 struct compat_getdents_callback *buf = __buf;
928 compat_ulong_t d_ino;
929 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
930
931 buf->error = -EINVAL; /* only used if we fail.. */
932 if (reclen > buf->count)
933 return -EINVAL;
934 d_ino = ino;
935 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
936 buf->error = -EOVERFLOW;
937 return -EOVERFLOW;
938 }
939 dirent = buf->previous;
940 if (dirent) {
941 if (__put_user(offset, &dirent->d_off))
942 goto efault;
943 }
944 dirent = buf->current_dir;
945 if (__put_user(d_ino, &dirent->d_ino))
946 goto efault;
947 if (__put_user(reclen, &dirent->d_reclen))
948 goto efault;
949 if (copy_to_user(dirent->d_name, name, namlen))
950 goto efault;
951 if (__put_user(0, dirent->d_name + namlen))
952 goto efault;
953 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
954 goto efault;
955 buf->previous = dirent;
956 dirent = (void __user *)dirent + reclen;
957 buf->current_dir = dirent;
958 buf->count -= reclen;
959 return 0;
960 efault:
961 buf->error = -EFAULT;
962 return -EFAULT;
963 }
964
965 asmlinkage long compat_sys_getdents(unsigned int fd,
966 struct compat_linux_dirent __user *dirent, unsigned int count)
967 {
968 struct file * file;
969 struct compat_linux_dirent __user * lastdirent;
970 struct compat_getdents_callback buf;
971 int error;
972
973 error = -EFAULT;
974 if (!access_ok(VERIFY_WRITE, dirent, count))
975 goto out;
976
977 error = -EBADF;
978 file = fget(fd);
979 if (!file)
980 goto out;
981
982 buf.current_dir = dirent;
983 buf.previous = NULL;
984 buf.count = count;
985 buf.error = 0;
986
987 error = vfs_readdir(file, compat_filldir, &buf);
988 if (error >= 0)
989 error = buf.error;
990 lastdirent = buf.previous;
991 if (lastdirent) {
992 if (put_user(file->f_pos, &lastdirent->d_off))
993 error = -EFAULT;
994 else
995 error = count - buf.count;
996 }
997 fput(file);
998 out:
999 return error;
1000 }
1001
1002 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1003
1004 struct compat_getdents_callback64 {
1005 struct linux_dirent64 __user *current_dir;
1006 struct linux_dirent64 __user *previous;
1007 int count;
1008 int error;
1009 };
1010
1011 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1012 u64 ino, unsigned int d_type)
1013 {
1014 struct linux_dirent64 __user *dirent;
1015 struct compat_getdents_callback64 *buf = __buf;
1016 int jj = NAME_OFFSET(dirent);
1017 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1018 u64 off;
1019
1020 buf->error = -EINVAL; /* only used if we fail.. */
1021 if (reclen > buf->count)
1022 return -EINVAL;
1023 dirent = buf->previous;
1024
1025 if (dirent) {
1026 if (__put_user_unaligned(offset, &dirent->d_off))
1027 goto efault;
1028 }
1029 dirent = buf->current_dir;
1030 if (__put_user_unaligned(ino, &dirent->d_ino))
1031 goto efault;
1032 off = 0;
1033 if (__put_user_unaligned(off, &dirent->d_off))
1034 goto efault;
1035 if (__put_user(reclen, &dirent->d_reclen))
1036 goto efault;
1037 if (__put_user(d_type, &dirent->d_type))
1038 goto efault;
1039 if (copy_to_user(dirent->d_name, name, namlen))
1040 goto efault;
1041 if (__put_user(0, dirent->d_name + namlen))
1042 goto efault;
1043 buf->previous = dirent;
1044 dirent = (void __user *)dirent + reclen;
1045 buf->current_dir = dirent;
1046 buf->count -= reclen;
1047 return 0;
1048 efault:
1049 buf->error = -EFAULT;
1050 return -EFAULT;
1051 }
1052
1053 asmlinkage long compat_sys_getdents64(unsigned int fd,
1054 struct linux_dirent64 __user * dirent, unsigned int count)
1055 {
1056 struct file * file;
1057 struct linux_dirent64 __user * lastdirent;
1058 struct compat_getdents_callback64 buf;
1059 int error;
1060
1061 error = -EFAULT;
1062 if (!access_ok(VERIFY_WRITE, dirent, count))
1063 goto out;
1064
1065 error = -EBADF;
1066 file = fget(fd);
1067 if (!file)
1068 goto out;
1069
1070 buf.current_dir = dirent;
1071 buf.previous = NULL;
1072 buf.count = count;
1073 buf.error = 0;
1074
1075 error = vfs_readdir(file, compat_filldir64, &buf);
1076 if (error >= 0)
1077 error = buf.error;
1078 lastdirent = buf.previous;
1079 if (lastdirent) {
1080 typeof(lastdirent->d_off) d_off = file->f_pos;
1081 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1082 error = -EFAULT;
1083 else
1084 error = count - buf.count;
1085 }
1086 fput(file);
1087 out:
1088 return error;
1089 }
1090 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1091
1092 static ssize_t compat_do_readv_writev(int type, struct file *file,
1093 const struct compat_iovec __user *uvector,
1094 unsigned long nr_segs, loff_t *pos)
1095 {
1096 compat_ssize_t tot_len;
1097 struct iovec iovstack[UIO_FASTIOV];
1098 struct iovec *iov=iovstack, *vector;
1099 ssize_t ret;
1100 int seg;
1101 io_fn_t fn;
1102 iov_fn_t fnv;
1103
1104 /*
1105 * SuS says "The readv() function *may* fail if the iovcnt argument
1106 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1107 * traditionally returned zero for zero segments, so...
1108 */
1109 ret = 0;
1110 if (nr_segs == 0)
1111 goto out;
1112
1113 /*
1114 * First get the "struct iovec" from user memory and
1115 * verify all the pointers
1116 */
1117 ret = -EINVAL;
1118 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1119 goto out;
1120 if (!file->f_op)
1121 goto out;
1122 if (nr_segs > UIO_FASTIOV) {
1123 ret = -ENOMEM;
1124 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1125 if (!iov)
1126 goto out;
1127 }
1128 ret = -EFAULT;
1129 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1130 goto out;
1131
1132 /*
1133 * Single unix specification:
1134 * We should -EINVAL if an element length is not >= 0 and fitting an
1135 * ssize_t. The total length is fitting an ssize_t
1136 *
1137 * Be careful here because iov_len is a size_t not an ssize_t
1138 */
1139 tot_len = 0;
1140 vector = iov;
1141 ret = -EINVAL;
1142 for (seg = 0 ; seg < nr_segs; seg++) {
1143 compat_ssize_t tmp = tot_len;
1144 compat_ssize_t len;
1145 compat_uptr_t buf;
1146
1147 if (__get_user(len, &uvector->iov_len) ||
1148 __get_user(buf, &uvector->iov_base)) {
1149 ret = -EFAULT;
1150 goto out;
1151 }
1152 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1153 goto out;
1154 tot_len += len;
1155 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1156 goto out;
1157 vector->iov_base = compat_ptr(buf);
1158 vector->iov_len = (compat_size_t) len;
1159 uvector++;
1160 vector++;
1161 }
1162 if (tot_len == 0) {
1163 ret = 0;
1164 goto out;
1165 }
1166
1167 ret = rw_verify_area(type, file, pos, tot_len);
1168 if (ret < 0)
1169 goto out;
1170
1171 fnv = NULL;
1172 if (type == READ) {
1173 fn = file->f_op->read;
1174 fnv = file->f_op->aio_read;
1175 } else {
1176 fn = (io_fn_t)file->f_op->write;
1177 fnv = file->f_op->aio_write;
1178 }
1179
1180 if (fnv)
1181 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1182 pos, fnv);
1183 else
1184 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1185
1186 out:
1187 if (iov != iovstack)
1188 kfree(iov);
1189 if ((ret + (type == READ)) > 0) {
1190 struct dentry *dentry = file->f_path.dentry;
1191 if (type == READ)
1192 fsnotify_access(dentry);
1193 else
1194 fsnotify_modify(dentry);
1195 }
1196 return ret;
1197 }
1198
1199 static size_t compat_readv(struct file *file,
1200 const struct compat_iovec __user *vec,
1201 unsigned long vlen, loff_t *pos)
1202 {
1203 ssize_t ret = -EBADF;
1204
1205 if (!(file->f_mode & FMODE_READ))
1206 goto out;
1207
1208 ret = -EINVAL;
1209 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1210 goto out;
1211
1212 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1213
1214 out:
1215 if (ret > 0)
1216 add_rchar(current, ret);
1217 inc_syscr(current);
1218 return ret;
1219 }
1220
1221 asmlinkage ssize_t
1222 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1223 unsigned long vlen)
1224 {
1225 struct file *file;
1226 int fput_needed;
1227 ssize_t ret;
1228
1229 file = fget_light(fd, &fput_needed);
1230 if (!file)
1231 return -EBADF;
1232 ret = compat_readv(file, vec, vlen, &file->f_pos);
1233 fput_light(file, fput_needed);
1234 return ret;
1235 }
1236
1237 asmlinkage ssize_t
1238 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1239 unsigned long vlen, u32 pos_high, u32 pos_low)
1240 {
1241 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1242 struct file *file;
1243 int fput_needed;
1244 ssize_t ret;
1245
1246 if (pos < 0)
1247 return -EINVAL;
1248 file = fget_light(fd, &fput_needed);
1249 if (!file)
1250 return -EBADF;
1251 ret = compat_readv(file, vec, vlen, &pos);
1252 fput_light(file, fput_needed);
1253 return ret;
1254 }
1255
1256 static size_t compat_writev(struct file *file,
1257 const struct compat_iovec __user *vec,
1258 unsigned long vlen, loff_t *pos)
1259 {
1260 ssize_t ret = -EBADF;
1261
1262 if (!(file->f_mode & FMODE_WRITE))
1263 goto out;
1264
1265 ret = -EINVAL;
1266 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1267 goto out;
1268
1269 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1270
1271 out:
1272 if (ret > 0)
1273 add_wchar(current, ret);
1274 inc_syscw(current);
1275 return ret;
1276 }
1277
1278 asmlinkage ssize_t
1279 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1280 unsigned long vlen)
1281 {
1282 struct file *file;
1283 int fput_needed;
1284 ssize_t ret;
1285
1286 file = fget_light(fd, &fput_needed);
1287 if (!file)
1288 return -EBADF;
1289 ret = compat_writev(file, vec, vlen, &file->f_pos);
1290 fput_light(file, fput_needed);
1291 return ret;
1292 }
1293
1294 asmlinkage ssize_t
1295 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1296 unsigned long vlen, u32 pos_high, u32 pos_low)
1297 {
1298 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1299 struct file *file;
1300 int fput_needed;
1301 ssize_t ret;
1302
1303 if (pos < 0)
1304 return -EINVAL;
1305 file = fget_light(fd, &fput_needed);
1306 if (!file)
1307 return -EBADF;
1308 ret = compat_writev(file, vec, vlen, &pos);
1309 fput_light(file, fput_needed);
1310 return ret;
1311 }
1312
1313 asmlinkage long
1314 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1315 unsigned int nr_segs, unsigned int flags)
1316 {
1317 unsigned i;
1318 struct iovec __user *iov;
1319 if (nr_segs > UIO_MAXIOV)
1320 return -EINVAL;
1321 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1322 for (i = 0; i < nr_segs; i++) {
1323 struct compat_iovec v;
1324 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1325 get_user(v.iov_len, &iov32[i].iov_len) ||
1326 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1327 put_user(v.iov_len, &iov[i].iov_len))
1328 return -EFAULT;
1329 }
1330 return sys_vmsplice(fd, iov, nr_segs, flags);
1331 }
1332
1333 /*
1334 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1335 * O_LARGEFILE flag.
1336 */
1337 asmlinkage long
1338 compat_sys_open(const char __user *filename, int flags, int mode)
1339 {
1340 return do_sys_open(AT_FDCWD, filename, flags, mode);
1341 }
1342
1343 /*
1344 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1345 * O_LARGEFILE flag.
1346 */
1347 asmlinkage long
1348 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1349 {
1350 return do_sys_open(dfd, filename, flags, mode);
1351 }
1352
1353 /*
1354 * compat_count() counts the number of arguments/envelopes. It is basically
1355 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1356 * and envp pointers.
1357 */
1358 static int compat_count(compat_uptr_t __user *argv, int max)
1359 {
1360 int i = 0;
1361
1362 if (argv != NULL) {
1363 for (;;) {
1364 compat_uptr_t p;
1365
1366 if (get_user(p, argv))
1367 return -EFAULT;
1368 if (!p)
1369 break;
1370 argv++;
1371 if (i++ >= max)
1372 return -E2BIG;
1373 }
1374 }
1375 return i;
1376 }
1377
1378 /*
1379 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1380 * except that it works with 32 bit argv and envp pointers.
1381 */
1382 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1383 struct linux_binprm *bprm)
1384 {
1385 struct page *kmapped_page = NULL;
1386 char *kaddr = NULL;
1387 unsigned long kpos = 0;
1388 int ret;
1389
1390 while (argc-- > 0) {
1391 compat_uptr_t str;
1392 int len;
1393 unsigned long pos;
1394
1395 if (get_user(str, argv+argc) ||
1396 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1397 ret = -EFAULT;
1398 goto out;
1399 }
1400
1401 if (len > MAX_ARG_STRLEN) {
1402 ret = -E2BIG;
1403 goto out;
1404 }
1405
1406 /* We're going to work our way backwords. */
1407 pos = bprm->p;
1408 str += len;
1409 bprm->p -= len;
1410
1411 while (len > 0) {
1412 int offset, bytes_to_copy;
1413
1414 offset = pos % PAGE_SIZE;
1415 if (offset == 0)
1416 offset = PAGE_SIZE;
1417
1418 bytes_to_copy = offset;
1419 if (bytes_to_copy > len)
1420 bytes_to_copy = len;
1421
1422 offset -= bytes_to_copy;
1423 pos -= bytes_to_copy;
1424 str -= bytes_to_copy;
1425 len -= bytes_to_copy;
1426
1427 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1428 struct page *page;
1429
1430 #ifdef CONFIG_STACK_GROWSUP
1431 ret = expand_stack_downwards(bprm->vma, pos);
1432 if (ret < 0) {
1433 /* We've exceed the stack rlimit. */
1434 ret = -E2BIG;
1435 goto out;
1436 }
1437 #endif
1438 ret = get_user_pages(current, bprm->mm, pos,
1439 1, 1, 1, &page, NULL);
1440 if (ret <= 0) {
1441 /* We've exceed the stack rlimit. */
1442 ret = -E2BIG;
1443 goto out;
1444 }
1445
1446 if (kmapped_page) {
1447 flush_kernel_dcache_page(kmapped_page);
1448 kunmap(kmapped_page);
1449 put_page(kmapped_page);
1450 }
1451 kmapped_page = page;
1452 kaddr = kmap(kmapped_page);
1453 kpos = pos & PAGE_MASK;
1454 flush_cache_page(bprm->vma, kpos,
1455 page_to_pfn(kmapped_page));
1456 }
1457 if (copy_from_user(kaddr+offset, compat_ptr(str),
1458 bytes_to_copy)) {
1459 ret = -EFAULT;
1460 goto out;
1461 }
1462 }
1463 }
1464 ret = 0;
1465 out:
1466 if (kmapped_page) {
1467 flush_kernel_dcache_page(kmapped_page);
1468 kunmap(kmapped_page);
1469 put_page(kmapped_page);
1470 }
1471 return ret;
1472 }
1473
1474 /*
1475 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1476 * that it processes 32 bit argv and envp pointers.
1477 */
1478 int compat_do_execve(char * filename,
1479 compat_uptr_t __user *argv,
1480 compat_uptr_t __user *envp,
1481 struct pt_regs * regs)
1482 {
1483 struct linux_binprm *bprm;
1484 struct file *file;
1485 struct files_struct *displaced;
1486 int retval;
1487
1488 retval = unshare_files(&displaced);
1489 if (retval)
1490 goto out_ret;
1491
1492 retval = -ENOMEM;
1493 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1494 if (!bprm)
1495 goto out_files;
1496
1497 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
1498 if (retval < 0)
1499 goto out_free;
1500 current->in_execve = 1;
1501
1502 retval = -ENOMEM;
1503 bprm->cred = prepare_exec_creds();
1504 if (!bprm->cred)
1505 goto out_unlock;
1506
1507 retval = check_unsafe_exec(bprm);
1508 if (retval)
1509 goto out_unlock;
1510
1511 file = open_exec(filename);
1512 retval = PTR_ERR(file);
1513 if (IS_ERR(file))
1514 goto out_unmark;
1515
1516 sched_exec();
1517
1518 bprm->file = file;
1519 bprm->filename = filename;
1520 bprm->interp = filename;
1521
1522 retval = bprm_mm_init(bprm);
1523 if (retval)
1524 goto out_file;
1525
1526 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1527 if ((retval = bprm->argc) < 0)
1528 goto out;
1529
1530 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1531 if ((retval = bprm->envc) < 0)
1532 goto out;
1533
1534 retval = prepare_binprm(bprm);
1535 if (retval < 0)
1536 goto out;
1537
1538 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1539 if (retval < 0)
1540 goto out;
1541
1542 bprm->exec = bprm->p;
1543 retval = compat_copy_strings(bprm->envc, envp, bprm);
1544 if (retval < 0)
1545 goto out;
1546
1547 retval = compat_copy_strings(bprm->argc, argv, bprm);
1548 if (retval < 0)
1549 goto out;
1550
1551 retval = search_binary_handler(bprm, regs);
1552 if (retval < 0)
1553 goto out;
1554
1555 /* execve succeeded */
1556 write_lock(&current->fs->lock);
1557 current->fs->in_exec = 0;
1558 write_unlock(&current->fs->lock);
1559 current->in_execve = 0;
1560 mutex_unlock(&current->cred_exec_mutex);
1561 acct_update_integrals(current);
1562 free_bprm(bprm);
1563 if (displaced)
1564 put_files_struct(displaced);
1565 return retval;
1566
1567 out:
1568 if (bprm->mm)
1569 mmput(bprm->mm);
1570
1571 out_file:
1572 if (bprm->file) {
1573 allow_write_access(bprm->file);
1574 fput(bprm->file);
1575 }
1576
1577 out_unmark:
1578 write_lock(&current->fs->lock);
1579 current->fs->in_exec = 0;
1580 write_unlock(&current->fs->lock);
1581
1582 out_unlock:
1583 current->in_execve = 0;
1584 mutex_unlock(&current->cred_exec_mutex);
1585
1586 out_free:
1587 free_bprm(bprm);
1588
1589 out_files:
1590 if (displaced)
1591 reset_files_struct(displaced);
1592 out_ret:
1593 return retval;
1594 }
1595
1596 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1597
1598 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1599 int timeval, int ret)
1600 {
1601 struct timespec ts;
1602
1603 if (!p)
1604 return ret;
1605
1606 if (current->personality & STICKY_TIMEOUTS)
1607 goto sticky;
1608
1609 /* No update for zero timeout */
1610 if (!end_time->tv_sec && !end_time->tv_nsec)
1611 return ret;
1612
1613 ktime_get_ts(&ts);
1614 ts = timespec_sub(*end_time, ts);
1615 if (ts.tv_sec < 0)
1616 ts.tv_sec = ts.tv_nsec = 0;
1617
1618 if (timeval) {
1619 struct compat_timeval rtv;
1620
1621 rtv.tv_sec = ts.tv_sec;
1622 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1623
1624 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1625 return ret;
1626 } else {
1627 struct compat_timespec rts;
1628
1629 rts.tv_sec = ts.tv_sec;
1630 rts.tv_nsec = ts.tv_nsec;
1631
1632 if (!copy_to_user(p, &rts, sizeof(rts)))
1633 return ret;
1634 }
1635 /*
1636 * If an application puts its timeval in read-only memory, we
1637 * don't want the Linux-specific update to the timeval to
1638 * cause a fault after the select has completed
1639 * successfully. However, because we're not updating the
1640 * timeval, we can't restart the system call.
1641 */
1642
1643 sticky:
1644 if (ret == -ERESTARTNOHAND)
1645 ret = -EINTR;
1646 return ret;
1647 }
1648
1649 /*
1650 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1651 * 64-bit unsigned longs.
1652 */
1653 static
1654 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1655 unsigned long *fdset)
1656 {
1657 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1658 if (ufdset) {
1659 unsigned long odd;
1660
1661 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1662 return -EFAULT;
1663
1664 odd = nr & 1UL;
1665 nr &= ~1UL;
1666 while (nr) {
1667 unsigned long h, l;
1668 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1669 return -EFAULT;
1670 ufdset += 2;
1671 *fdset++ = h << 32 | l;
1672 nr -= 2;
1673 }
1674 if (odd && __get_user(*fdset, ufdset))
1675 return -EFAULT;
1676 } else {
1677 /* Tricky, must clear full unsigned long in the
1678 * kernel fdset at the end, this makes sure that
1679 * actually happens.
1680 */
1681 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1682 }
1683 return 0;
1684 }
1685
1686 static
1687 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1688 unsigned long *fdset)
1689 {
1690 unsigned long odd;
1691 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1692
1693 if (!ufdset)
1694 return 0;
1695
1696 odd = nr & 1UL;
1697 nr &= ~1UL;
1698 while (nr) {
1699 unsigned long h, l;
1700 l = *fdset++;
1701 h = l >> 32;
1702 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1703 return -EFAULT;
1704 ufdset += 2;
1705 nr -= 2;
1706 }
1707 if (odd && __put_user(*fdset, ufdset))
1708 return -EFAULT;
1709 return 0;
1710 }
1711
1712
1713 /*
1714 * This is a virtual copy of sys_select from fs/select.c and probably
1715 * should be compared to it from time to time
1716 */
1717
1718 /*
1719 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1720 * like to be certain this leads to no problems. So I return
1721 * EINTR just for safety.
1722 *
1723 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1724 * I'm trying ERESTARTNOHAND which restart only when you want to.
1725 */
1726 #define MAX_SELECT_SECONDS \
1727 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1728
1729 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1730 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1731 struct timespec *end_time)
1732 {
1733 fd_set_bits fds;
1734 void *bits;
1735 int size, max_fds, ret = -EINVAL;
1736 struct fdtable *fdt;
1737 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1738
1739 if (n < 0)
1740 goto out_nofds;
1741
1742 /* max_fds can increase, so grab it once to avoid race */
1743 rcu_read_lock();
1744 fdt = files_fdtable(current->files);
1745 max_fds = fdt->max_fds;
1746 rcu_read_unlock();
1747 if (n > max_fds)
1748 n = max_fds;
1749
1750 /*
1751 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1752 * since we used fdset we need to allocate memory in units of
1753 * long-words.
1754 */
1755 size = FDS_BYTES(n);
1756 bits = stack_fds;
1757 if (size > sizeof(stack_fds) / 6) {
1758 bits = kmalloc(6 * size, GFP_KERNEL);
1759 ret = -ENOMEM;
1760 if (!bits)
1761 goto out_nofds;
1762 }
1763 fds.in = (unsigned long *) bits;
1764 fds.out = (unsigned long *) (bits + size);
1765 fds.ex = (unsigned long *) (bits + 2*size);
1766 fds.res_in = (unsigned long *) (bits + 3*size);
1767 fds.res_out = (unsigned long *) (bits + 4*size);
1768 fds.res_ex = (unsigned long *) (bits + 5*size);
1769
1770 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1771 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1772 (ret = compat_get_fd_set(n, exp, fds.ex)))
1773 goto out;
1774 zero_fd_set(n, fds.res_in);
1775 zero_fd_set(n, fds.res_out);
1776 zero_fd_set(n, fds.res_ex);
1777
1778 ret = do_select(n, &fds, end_time);
1779
1780 if (ret < 0)
1781 goto out;
1782 if (!ret) {
1783 ret = -ERESTARTNOHAND;
1784 if (signal_pending(current))
1785 goto out;
1786 ret = 0;
1787 }
1788
1789 if (compat_set_fd_set(n, inp, fds.res_in) ||
1790 compat_set_fd_set(n, outp, fds.res_out) ||
1791 compat_set_fd_set(n, exp, fds.res_ex))
1792 ret = -EFAULT;
1793 out:
1794 if (bits != stack_fds)
1795 kfree(bits);
1796 out_nofds:
1797 return ret;
1798 }
1799
1800 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1801 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1802 struct compat_timeval __user *tvp)
1803 {
1804 struct timespec end_time, *to = NULL;
1805 struct compat_timeval tv;
1806 int ret;
1807
1808 if (tvp) {
1809 if (copy_from_user(&tv, tvp, sizeof(tv)))
1810 return -EFAULT;
1811
1812 to = &end_time;
1813 if (poll_select_set_timeout(to,
1814 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1815 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1816 return -EINVAL;
1817 }
1818
1819 ret = compat_core_sys_select(n, inp, outp, exp, to);
1820 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1821
1822 return ret;
1823 }
1824
1825 #ifdef HAVE_SET_RESTORE_SIGMASK
1826 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1827 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1828 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1829 compat_size_t sigsetsize)
1830 {
1831 compat_sigset_t ss32;
1832 sigset_t ksigmask, sigsaved;
1833 struct compat_timespec ts;
1834 struct timespec end_time, *to = NULL;
1835 int ret;
1836
1837 if (tsp) {
1838 if (copy_from_user(&ts, tsp, sizeof(ts)))
1839 return -EFAULT;
1840
1841 to = &end_time;
1842 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1843 return -EINVAL;
1844 }
1845
1846 if (sigmask) {
1847 if (sigsetsize != sizeof(compat_sigset_t))
1848 return -EINVAL;
1849 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1850 return -EFAULT;
1851 sigset_from_compat(&ksigmask, &ss32);
1852
1853 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1854 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1855 }
1856
1857 ret = compat_core_sys_select(n, inp, outp, exp, to);
1858 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1859
1860 if (ret == -ERESTARTNOHAND) {
1861 /*
1862 * Don't restore the signal mask yet. Let do_signal() deliver
1863 * the signal on the way back to userspace, before the signal
1864 * mask is restored.
1865 */
1866 if (sigmask) {
1867 memcpy(&current->saved_sigmask, &sigsaved,
1868 sizeof(sigsaved));
1869 set_restore_sigmask();
1870 }
1871 } else if (sigmask)
1872 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1873
1874 return ret;
1875 }
1876
1877 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1878 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1879 struct compat_timespec __user *tsp, void __user *sig)
1880 {
1881 compat_size_t sigsetsize = 0;
1882 compat_uptr_t up = 0;
1883
1884 if (sig) {
1885 if (!access_ok(VERIFY_READ, sig,
1886 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1887 __get_user(up, (compat_uptr_t __user *)sig) ||
1888 __get_user(sigsetsize,
1889 (compat_size_t __user *)(sig+sizeof(up))))
1890 return -EFAULT;
1891 }
1892 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1893 sigsetsize);
1894 }
1895
1896 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1897 unsigned int nfds, struct compat_timespec __user *tsp,
1898 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1899 {
1900 compat_sigset_t ss32;
1901 sigset_t ksigmask, sigsaved;
1902 struct compat_timespec ts;
1903 struct timespec end_time, *to = NULL;
1904 int ret;
1905
1906 if (tsp) {
1907 if (copy_from_user(&ts, tsp, sizeof(ts)))
1908 return -EFAULT;
1909
1910 to = &end_time;
1911 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1912 return -EINVAL;
1913 }
1914
1915 if (sigmask) {
1916 if (sigsetsize != sizeof(compat_sigset_t))
1917 return -EINVAL;
1918 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1919 return -EFAULT;
1920 sigset_from_compat(&ksigmask, &ss32);
1921
1922 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1923 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1924 }
1925
1926 ret = do_sys_poll(ufds, nfds, to);
1927
1928 /* We can restart this syscall, usually */
1929 if (ret == -EINTR) {
1930 /*
1931 * Don't restore the signal mask yet. Let do_signal() deliver
1932 * the signal on the way back to userspace, before the signal
1933 * mask is restored.
1934 */
1935 if (sigmask) {
1936 memcpy(&current->saved_sigmask, &sigsaved,
1937 sizeof(sigsaved));
1938 set_restore_sigmask();
1939 }
1940 ret = -ERESTARTNOHAND;
1941 } else if (sigmask)
1942 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1943
1944 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1945
1946 return ret;
1947 }
1948 #endif /* HAVE_SET_RESTORE_SIGMASK */
1949
1950 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1951 /* Stuff for NFS server syscalls... */
1952 struct compat_nfsctl_svc {
1953 u16 svc32_port;
1954 s32 svc32_nthreads;
1955 };
1956
1957 struct compat_nfsctl_client {
1958 s8 cl32_ident[NFSCLNT_IDMAX+1];
1959 s32 cl32_naddr;
1960 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1961 s32 cl32_fhkeytype;
1962 s32 cl32_fhkeylen;
1963 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1964 };
1965
1966 struct compat_nfsctl_export {
1967 char ex32_client[NFSCLNT_IDMAX+1];
1968 char ex32_path[NFS_MAXPATHLEN+1];
1969 compat_dev_t ex32_dev;
1970 compat_ino_t ex32_ino;
1971 compat_int_t ex32_flags;
1972 __compat_uid_t ex32_anon_uid;
1973 __compat_gid_t ex32_anon_gid;
1974 };
1975
1976 struct compat_nfsctl_fdparm {
1977 struct sockaddr gd32_addr;
1978 s8 gd32_path[NFS_MAXPATHLEN+1];
1979 compat_int_t gd32_version;
1980 };
1981
1982 struct compat_nfsctl_fsparm {
1983 struct sockaddr gd32_addr;
1984 s8 gd32_path[NFS_MAXPATHLEN+1];
1985 compat_int_t gd32_maxlen;
1986 };
1987
1988 struct compat_nfsctl_arg {
1989 compat_int_t ca32_version; /* safeguard */
1990 union {
1991 struct compat_nfsctl_svc u32_svc;
1992 struct compat_nfsctl_client u32_client;
1993 struct compat_nfsctl_export u32_export;
1994 struct compat_nfsctl_fdparm u32_getfd;
1995 struct compat_nfsctl_fsparm u32_getfs;
1996 } u;
1997 #define ca32_svc u.u32_svc
1998 #define ca32_client u.u32_client
1999 #define ca32_export u.u32_export
2000 #define ca32_getfd u.u32_getfd
2001 #define ca32_getfs u.u32_getfs
2002 };
2003
2004 union compat_nfsctl_res {
2005 __u8 cr32_getfh[NFS_FHSIZE];
2006 struct knfsd_fh cr32_getfs;
2007 };
2008
2009 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2010 struct compat_nfsctl_arg __user *arg)
2011 {
2012 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2013 get_user(karg->ca_version, &arg->ca32_version) ||
2014 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2015 __get_user(karg->ca_svc.svc_nthreads,
2016 &arg->ca32_svc.svc32_nthreads))
2017 return -EFAULT;
2018 return 0;
2019 }
2020
2021 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2022 struct compat_nfsctl_arg __user *arg)
2023 {
2024 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2025 sizeof(arg->ca32_client)) ||
2026 get_user(karg->ca_version, &arg->ca32_version) ||
2027 __copy_from_user(&karg->ca_client.cl_ident[0],
2028 &arg->ca32_client.cl32_ident[0],
2029 NFSCLNT_IDMAX) ||
2030 __get_user(karg->ca_client.cl_naddr,
2031 &arg->ca32_client.cl32_naddr) ||
2032 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2033 &arg->ca32_client.cl32_addrlist[0],
2034 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2035 __get_user(karg->ca_client.cl_fhkeytype,
2036 &arg->ca32_client.cl32_fhkeytype) ||
2037 __get_user(karg->ca_client.cl_fhkeylen,
2038 &arg->ca32_client.cl32_fhkeylen) ||
2039 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2040 &arg->ca32_client.cl32_fhkey[0],
2041 NFSCLNT_KEYMAX))
2042 return -EFAULT;
2043
2044 return 0;
2045 }
2046
2047 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2048 struct compat_nfsctl_arg __user *arg)
2049 {
2050 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2051 sizeof(arg->ca32_export)) ||
2052 get_user(karg->ca_version, &arg->ca32_version) ||
2053 __copy_from_user(&karg->ca_export.ex_client[0],
2054 &arg->ca32_export.ex32_client[0],
2055 NFSCLNT_IDMAX) ||
2056 __copy_from_user(&karg->ca_export.ex_path[0],
2057 &arg->ca32_export.ex32_path[0],
2058 NFS_MAXPATHLEN) ||
2059 __get_user(karg->ca_export.ex_dev,
2060 &arg->ca32_export.ex32_dev) ||
2061 __get_user(karg->ca_export.ex_ino,
2062 &arg->ca32_export.ex32_ino) ||
2063 __get_user(karg->ca_export.ex_flags,
2064 &arg->ca32_export.ex32_flags) ||
2065 __get_user(karg->ca_export.ex_anon_uid,
2066 &arg->ca32_export.ex32_anon_uid) ||
2067 __get_user(karg->ca_export.ex_anon_gid,
2068 &arg->ca32_export.ex32_anon_gid))
2069 return -EFAULT;
2070 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2071 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2072
2073 return 0;
2074 }
2075
2076 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2077 struct compat_nfsctl_arg __user *arg)
2078 {
2079 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2080 sizeof(arg->ca32_getfd)) ||
2081 get_user(karg->ca_version, &arg->ca32_version) ||
2082 __copy_from_user(&karg->ca_getfd.gd_addr,
2083 &arg->ca32_getfd.gd32_addr,
2084 (sizeof(struct sockaddr))) ||
2085 __copy_from_user(&karg->ca_getfd.gd_path,
2086 &arg->ca32_getfd.gd32_path,
2087 (NFS_MAXPATHLEN+1)) ||
2088 __get_user(karg->ca_getfd.gd_version,
2089 &arg->ca32_getfd.gd32_version))
2090 return -EFAULT;
2091
2092 return 0;
2093 }
2094
2095 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2096 struct compat_nfsctl_arg __user *arg)
2097 {
2098 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2099 get_user(karg->ca_version, &arg->ca32_version) ||
2100 __copy_from_user(&karg->ca_getfs.gd_addr,
2101 &arg->ca32_getfs.gd32_addr,
2102 (sizeof(struct sockaddr))) ||
2103 __copy_from_user(&karg->ca_getfs.gd_path,
2104 &arg->ca32_getfs.gd32_path,
2105 (NFS_MAXPATHLEN+1)) ||
2106 __get_user(karg->ca_getfs.gd_maxlen,
2107 &arg->ca32_getfs.gd32_maxlen))
2108 return -EFAULT;
2109
2110 return 0;
2111 }
2112
2113 /* This really doesn't need translations, we are only passing
2114 * back a union which contains opaque nfs file handle data.
2115 */
2116 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2117 union compat_nfsctl_res __user *res)
2118 {
2119 int err;
2120
2121 err = copy_to_user(res, kres, sizeof(*res));
2122
2123 return (err) ? -EFAULT : 0;
2124 }
2125
2126 asmlinkage long compat_sys_nfsservctl(int cmd,
2127 struct compat_nfsctl_arg __user *arg,
2128 union compat_nfsctl_res __user *res)
2129 {
2130 struct nfsctl_arg *karg;
2131 union nfsctl_res *kres;
2132 mm_segment_t oldfs;
2133 int err;
2134
2135 karg = kmalloc(sizeof(*karg), GFP_USER);
2136 kres = kmalloc(sizeof(*kres), GFP_USER);
2137 if(!karg || !kres) {
2138 err = -ENOMEM;
2139 goto done;
2140 }
2141
2142 switch(cmd) {
2143 case NFSCTL_SVC:
2144 err = compat_nfs_svc_trans(karg, arg);
2145 break;
2146
2147 case NFSCTL_ADDCLIENT:
2148 err = compat_nfs_clnt_trans(karg, arg);
2149 break;
2150
2151 case NFSCTL_DELCLIENT:
2152 err = compat_nfs_clnt_trans(karg, arg);
2153 break;
2154
2155 case NFSCTL_EXPORT:
2156 case NFSCTL_UNEXPORT:
2157 err = compat_nfs_exp_trans(karg, arg);
2158 break;
2159
2160 case NFSCTL_GETFD:
2161 err = compat_nfs_getfd_trans(karg, arg);
2162 break;
2163
2164 case NFSCTL_GETFS:
2165 err = compat_nfs_getfs_trans(karg, arg);
2166 break;
2167
2168 default:
2169 err = -EINVAL;
2170 break;
2171 }
2172
2173 if (err)
2174 goto done;
2175
2176 oldfs = get_fs();
2177 set_fs(KERNEL_DS);
2178 /* The __user pointer casts are valid because of the set_fs() */
2179 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2180 set_fs(oldfs);
2181
2182 if (err)
2183 goto done;
2184
2185 if((cmd == NFSCTL_GETFD) ||
2186 (cmd == NFSCTL_GETFS))
2187 err = compat_nfs_getfh_res_trans(kres, res);
2188
2189 done:
2190 kfree(karg);
2191 kfree(kres);
2192 return err;
2193 }
2194 #else /* !NFSD */
2195 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2196 {
2197 return sys_ni_syscall();
2198 }
2199 #endif
2200
2201 #ifdef CONFIG_EPOLL
2202
2203 #ifdef HAVE_SET_RESTORE_SIGMASK
2204 asmlinkage long compat_sys_epoll_pwait(int epfd,
2205 struct compat_epoll_event __user *events,
2206 int maxevents, int timeout,
2207 const compat_sigset_t __user *sigmask,
2208 compat_size_t sigsetsize)
2209 {
2210 long err;
2211 compat_sigset_t csigmask;
2212 sigset_t ksigmask, sigsaved;
2213
2214 /*
2215 * If the caller wants a certain signal mask to be set during the wait,
2216 * we apply it here.
2217 */
2218 if (sigmask) {
2219 if (sigsetsize != sizeof(compat_sigset_t))
2220 return -EINVAL;
2221 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2222 return -EFAULT;
2223 sigset_from_compat(&ksigmask, &csigmask);
2224 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2225 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2226 }
2227
2228 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2229
2230 /*
2231 * If we changed the signal mask, we need to restore the original one.
2232 * In case we've got a signal while waiting, we do not restore the
2233 * signal mask yet, and we allow do_signal() to deliver the signal on
2234 * the way back to userspace, before the signal mask is restored.
2235 */
2236 if (sigmask) {
2237 if (err == -EINTR) {
2238 memcpy(&current->saved_sigmask, &sigsaved,
2239 sizeof(sigsaved));
2240 set_restore_sigmask();
2241 } else
2242 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2243 }
2244
2245 return err;
2246 }
2247 #endif /* HAVE_SET_RESTORE_SIGMASK */
2248
2249 #endif /* CONFIG_EPOLL */
2250
2251 #ifdef CONFIG_SIGNALFD
2252
2253 asmlinkage long compat_sys_signalfd4(int ufd,
2254 const compat_sigset_t __user *sigmask,
2255 compat_size_t sigsetsize, int flags)
2256 {
2257 compat_sigset_t ss32;
2258 sigset_t tmp;
2259 sigset_t __user *ksigmask;
2260
2261 if (sigsetsize != sizeof(compat_sigset_t))
2262 return -EINVAL;
2263 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2264 return -EFAULT;
2265 sigset_from_compat(&tmp, &ss32);
2266 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2267 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2268 return -EFAULT;
2269
2270 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2271 }
2272
2273 asmlinkage long compat_sys_signalfd(int ufd,
2274 const compat_sigset_t __user *sigmask,
2275 compat_size_t sigsetsize)
2276 {
2277 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2278 }
2279 #endif /* CONFIG_SIGNALFD */
2280
2281 #ifdef CONFIG_TIMERFD
2282
2283 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2284 const struct compat_itimerspec __user *utmr,
2285 struct compat_itimerspec __user *otmr)
2286 {
2287 int error;
2288 struct itimerspec t;
2289 struct itimerspec __user *ut;
2290
2291 if (get_compat_itimerspec(&t, utmr))
2292 return -EFAULT;
2293 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2294 if (copy_to_user(&ut[0], &t, sizeof(t)))
2295 return -EFAULT;
2296 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2297 if (!error && otmr)
2298 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2299 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2300
2301 return error;
2302 }
2303
2304 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2305 struct compat_itimerspec __user *otmr)
2306 {
2307 int error;
2308 struct itimerspec t;
2309 struct itimerspec __user *ut;
2310
2311 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2312 error = sys_timerfd_gettime(ufd, ut);
2313 if (!error)
2314 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2315 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2316
2317 return error;
2318 }
2319
2320 #endif /* CONFIG_TIMERFD */
Support for the Chinese Samsung S3C2440 based development boards