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Bluetooth: Fix abuse of the preincrement operator
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / compat.c
blobf0b391c50552dc986f93afe1e4c56ce3b777a600
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/syscalls.h>
36 #include <linux/ctype.h>
37 #include <linux/module.h>
38 #include <linux/dirent.h>
39 #include <linux/fsnotify.h>
40 #include <linux/highuid.h>
41 #include <linux/nfsd/syscall.h>
42 #include <linux/personality.h>
43 #include <linux/rwsem.h>
44 #include <linux/tsacct_kern.h>
45 #include <linux/security.h>
46 #include <linux/highmem.h>
47 #include <linux/signal.h>
48 #include <linux/poll.h>
49 #include <linux/mm.h>
50 #include <linux/eventpoll.h>
51 #include <linux/fs_struct.h>
52 #include <linux/slab.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ioctls.h>
57 #include "internal.h"
58
59 int compat_log = 1;
60
61 int compat_printk(const char *fmt, ...)
62 {
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71 }
72
73 #include "read_write.h"
74
75 /*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
80 {
81 struct timespec tv[2];
82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
87 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
89 }
90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91 }
92
93 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
94 {
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
102 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103 return 0;
104 }
105 return do_utimes(dfd, filename, t ? tv : NULL, flags);
106 }
107
108 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
109 {
110 struct timespec tv[2];
111
112 if (t) {
113 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
114 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
115 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
116 get_user(tv[1].tv_nsec, &t[1].tv_usec))
117 return -EFAULT;
118 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120 return -EINVAL;
121 tv[0].tv_nsec *= 1000;
122 tv[1].tv_nsec *= 1000;
123 }
124 return do_utimes(dfd, filename, t ? tv : NULL, 0);
125 }
126
127 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
128 {
129 return compat_sys_futimesat(AT_FDCWD, filename, t);
130 }
131
132 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133 {
134 compat_ino_t ino = stat->ino;
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 int err;
138
139 SET_UID(uid, stat->uid);
140 SET_GID(gid, stat->gid);
141
142 if ((u64) stat->size > MAX_NON_LFS ||
143 !old_valid_dev(stat->dev) ||
144 !old_valid_dev(stat->rdev))
145 return -EOVERFLOW;
146 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147 return -EOVERFLOW;
148
149 if (clear_user(ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153 err |= __put_user(ino, &ubuf->st_ino);
154 err |= __put_user(stat->mode, &ubuf->st_mode);
155 err |= __put_user(stat->nlink, &ubuf->st_nlink);
156 err |= __put_user(uid, &ubuf->st_uid);
157 err |= __put_user(gid, &ubuf->st_gid);
158 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159 err |= __put_user(stat->size, &ubuf->st_size);
160 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166 err |= __put_user(stat->blksize, &ubuf->st_blksize);
167 err |= __put_user(stat->blocks, &ubuf->st_blocks);
168 return err;
169 }
170
171 asmlinkage long compat_sys_newstat(char __user * filename,
172 struct compat_stat __user *statbuf)
173 {
174 struct kstat stat;
175 int error;
176
177 error = vfs_stat(filename, &stat);
178 if (error)
179 return error;
180 return cp_compat_stat(&stat, statbuf);
181 }
182
183 asmlinkage long compat_sys_newlstat(char __user * filename,
184 struct compat_stat __user *statbuf)
185 {
186 struct kstat stat;
187 int error;
188
189 error = vfs_lstat(filename, &stat);
190 if (error)
191 return error;
192 return cp_compat_stat(&stat, statbuf);
193 }
194
195 #ifndef __ARCH_WANT_STAT64
196 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
197 struct compat_stat __user *statbuf, int flag)
198 {
199 struct kstat stat;
200 int error;
201
202 error = vfs_fstatat(dfd, filename, &stat, flag);
203 if (error)
204 return error;
205 return cp_compat_stat(&stat, statbuf);
206 }
207 #endif
208
209 asmlinkage long compat_sys_newfstat(unsigned int fd,
210 struct compat_stat __user * statbuf)
211 {
212 struct kstat stat;
213 int error = vfs_fstat(fd, &stat);
214
215 if (!error)
216 error = cp_compat_stat(&stat, statbuf);
217 return error;
218 }
219
220 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
221 {
222
223 if (sizeof ubuf->f_blocks == 4) {
224 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
225 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
226 return -EOVERFLOW;
227 /* f_files and f_ffree may be -1; it's okay
228 * to stuff that into 32 bits */
229 if (kbuf->f_files != 0xffffffffffffffffULL
230 && (kbuf->f_files & 0xffffffff00000000ULL))
231 return -EOVERFLOW;
232 if (kbuf->f_ffree != 0xffffffffffffffffULL
233 && (kbuf->f_ffree & 0xffffffff00000000ULL))
234 return -EOVERFLOW;
235 }
236 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
237 __put_user(kbuf->f_type, &ubuf->f_type) ||
238 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
239 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
240 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
241 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
242 __put_user(kbuf->f_files, &ubuf->f_files) ||
243 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
244 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
245 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
246 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
247 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
248 __put_user(0, &ubuf->f_spare[0]) ||
249 __put_user(0, &ubuf->f_spare[1]) ||
250 __put_user(0, &ubuf->f_spare[2]) ||
251 __put_user(0, &ubuf->f_spare[3]) ||
252 __put_user(0, &ubuf->f_spare[4]))
253 return -EFAULT;
254 return 0;
255 }
256
257 /*
258 * The following statfs calls are copies of code from fs/open.c and
259 * should be checked against those from time to time
260 */
261 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
262 {
263 struct path path;
264 int error;
265
266 error = user_path(pathname, &path);
267 if (!error) {
268 struct kstatfs tmp;
269 error = vfs_statfs(path.dentry, &tmp);
270 if (!error)
271 error = put_compat_statfs(buf, &tmp);
272 path_put(&path);
273 }
274 return error;
275 }
276
277 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
278 {
279 struct file * file;
280 struct kstatfs tmp;
281 int error;
282
283 error = -EBADF;
284 file = fget(fd);
285 if (!file)
286 goto out;
287 error = vfs_statfs(file->f_path.dentry, &tmp);
288 if (!error)
289 error = put_compat_statfs(buf, &tmp);
290 fput(file);
291 out:
292 return error;
293 }
294
295 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
296 {
297 if (sizeof ubuf->f_blocks == 4) {
298 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
299 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
300 return -EOVERFLOW;
301 /* f_files and f_ffree may be -1; it's okay
302 * to stuff that into 32 bits */
303 if (kbuf->f_files != 0xffffffffffffffffULL
304 && (kbuf->f_files & 0xffffffff00000000ULL))
305 return -EOVERFLOW;
306 if (kbuf->f_ffree != 0xffffffffffffffffULL
307 && (kbuf->f_ffree & 0xffffffff00000000ULL))
308 return -EOVERFLOW;
309 }
310 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
311 __put_user(kbuf->f_type, &ubuf->f_type) ||
312 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
313 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
314 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
315 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
316 __put_user(kbuf->f_files, &ubuf->f_files) ||
317 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
318 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
319 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
320 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
321 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
322 return -EFAULT;
323 return 0;
324 }
325
326 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
327 {
328 struct path path;
329 int error;
330
331 if (sz != sizeof(*buf))
332 return -EINVAL;
333
334 error = user_path(pathname, &path);
335 if (!error) {
336 struct kstatfs tmp;
337 error = vfs_statfs(path.dentry, &tmp);
338 if (!error)
339 error = put_compat_statfs64(buf, &tmp);
340 path_put(&path);
341 }
342 return error;
343 }
344
345 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
346 {
347 struct file * file;
348 struct kstatfs tmp;
349 int error;
350
351 if (sz != sizeof(*buf))
352 return -EINVAL;
353
354 error = -EBADF;
355 file = fget(fd);
356 if (!file)
357 goto out;
358 error = vfs_statfs(file->f_path.dentry, &tmp);
359 if (!error)
360 error = put_compat_statfs64(buf, &tmp);
361 fput(file);
362 out:
363 return error;
364 }
365
366 /*
367 * This is a copy of sys_ustat, just dealing with a structure layout.
368 * Given how simple this syscall is that apporach is more maintainable
369 * than the various conversion hacks.
370 */
371 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
372 {
373 struct super_block *sb;
374 struct compat_ustat tmp;
375 struct kstatfs sbuf;
376 int err;
377
378 sb = user_get_super(new_decode_dev(dev));
379 if (!sb)
380 return -EINVAL;
381 err = vfs_statfs(sb->s_root, &sbuf);
382 drop_super(sb);
383 if (err)
384 return err;
385
386 memset(&tmp, 0, sizeof(struct compat_ustat));
387 tmp.f_tfree = sbuf.f_bfree;
388 tmp.f_tinode = sbuf.f_ffree;
389 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
390 return -EFAULT;
391 return 0;
392 }
393
394 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
395 {
396 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
397 __get_user(kfl->l_type, &ufl->l_type) ||
398 __get_user(kfl->l_whence, &ufl->l_whence) ||
399 __get_user(kfl->l_start, &ufl->l_start) ||
400 __get_user(kfl->l_len, &ufl->l_len) ||
401 __get_user(kfl->l_pid, &ufl->l_pid))
402 return -EFAULT;
403 return 0;
404 }
405
406 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
407 {
408 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
409 __put_user(kfl->l_type, &ufl->l_type) ||
410 __put_user(kfl->l_whence, &ufl->l_whence) ||
411 __put_user(kfl->l_start, &ufl->l_start) ||
412 __put_user(kfl->l_len, &ufl->l_len) ||
413 __put_user(kfl->l_pid, &ufl->l_pid))
414 return -EFAULT;
415 return 0;
416 }
417
418 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
419 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
420 {
421 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
422 __get_user(kfl->l_type, &ufl->l_type) ||
423 __get_user(kfl->l_whence, &ufl->l_whence) ||
424 __get_user(kfl->l_start, &ufl->l_start) ||
425 __get_user(kfl->l_len, &ufl->l_len) ||
426 __get_user(kfl->l_pid, &ufl->l_pid))
427 return -EFAULT;
428 return 0;
429 }
430 #endif
431
432 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
433 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
434 {
435 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
436 __put_user(kfl->l_type, &ufl->l_type) ||
437 __put_user(kfl->l_whence, &ufl->l_whence) ||
438 __put_user(kfl->l_start, &ufl->l_start) ||
439 __put_user(kfl->l_len, &ufl->l_len) ||
440 __put_user(kfl->l_pid, &ufl->l_pid))
441 return -EFAULT;
442 return 0;
443 }
444 #endif
445
446 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
447 unsigned long arg)
448 {
449 mm_segment_t old_fs;
450 struct flock f;
451 long ret;
452
453 switch (cmd) {
454 case F_GETLK:
455 case F_SETLK:
456 case F_SETLKW:
457 ret = get_compat_flock(&f, compat_ptr(arg));
458 if (ret != 0)
459 break;
460 old_fs = get_fs();
461 set_fs(KERNEL_DS);
462 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
463 set_fs(old_fs);
464 if (cmd == F_GETLK && ret == 0) {
465 /* GETLK was successful and we need to return the data...
466 * but it needs to fit in the compat structure.
467 * l_start shouldn't be too big, unless the original
468 * start + end is greater than COMPAT_OFF_T_MAX, in which
469 * case the app was asking for trouble, so we return
470 * -EOVERFLOW in that case.
471 * l_len could be too big, in which case we just truncate it,
472 * and only allow the app to see that part of the conflicting
473 * lock that might make sense to it anyway
474 */
475
476 if (f.l_start > COMPAT_OFF_T_MAX)
477 ret = -EOVERFLOW;
478 if (f.l_len > COMPAT_OFF_T_MAX)
479 f.l_len = COMPAT_OFF_T_MAX;
480 if (ret == 0)
481 ret = put_compat_flock(&f, compat_ptr(arg));
482 }
483 break;
484
485 case F_GETLK64:
486 case F_SETLK64:
487 case F_SETLKW64:
488 ret = get_compat_flock64(&f, compat_ptr(arg));
489 if (ret != 0)
490 break;
491 old_fs = get_fs();
492 set_fs(KERNEL_DS);
493 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
494 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
495 (unsigned long)&f);
496 set_fs(old_fs);
497 if (cmd == F_GETLK64 && ret == 0) {
498 /* need to return lock information - see above for commentary */
499 if (f.l_start > COMPAT_LOFF_T_MAX)
500 ret = -EOVERFLOW;
501 if (f.l_len > COMPAT_LOFF_T_MAX)
502 f.l_len = COMPAT_LOFF_T_MAX;
503 if (ret == 0)
504 ret = put_compat_flock64(&f, compat_ptr(arg));
505 }
506 break;
507
508 default:
509 ret = sys_fcntl(fd, cmd, arg);
510 break;
511 }
512 return ret;
513 }
514
515 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
516 unsigned long arg)
517 {
518 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
519 return -EINVAL;
520 return compat_sys_fcntl64(fd, cmd, arg);
521 }
522
523 asmlinkage long
524 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
525 {
526 long ret;
527 aio_context_t ctx64;
528
529 mm_segment_t oldfs = get_fs();
530 if (unlikely(get_user(ctx64, ctx32p)))
531 return -EFAULT;
532
533 set_fs(KERNEL_DS);
534 /* The __user pointer cast is valid because of the set_fs() */
535 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
536 set_fs(oldfs);
537 /* truncating is ok because it's a user address */
538 if (!ret)
539 ret = put_user((u32) ctx64, ctx32p);
540 return ret;
541 }
542
543 asmlinkage long
544 compat_sys_io_getevents(aio_context_t ctx_id,
545 unsigned long min_nr,
546 unsigned long nr,
547 struct io_event __user *events,
548 struct compat_timespec __user *timeout)
549 {
550 long ret;
551 struct timespec t;
552 struct timespec __user *ut = NULL;
553
554 ret = -EFAULT;
555 if (unlikely(!access_ok(VERIFY_WRITE, events,
556 nr * sizeof(struct io_event))))
557 goto out;
558 if (timeout) {
559 if (get_compat_timespec(&t, timeout))
560 goto out;
561
562 ut = compat_alloc_user_space(sizeof(*ut));
563 if (copy_to_user(ut, &t, sizeof(t)) )
564 goto out;
565 }
566 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
567 out:
568 return ret;
569 }
570
571 /* A write operation does a read from user space and vice versa */
572 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
573
574 ssize_t compat_rw_copy_check_uvector(int type,
575 const struct compat_iovec __user *uvector, unsigned long nr_segs,
576 unsigned long fast_segs, struct iovec *fast_pointer,
577 struct iovec **ret_pointer)
578 {
579 compat_ssize_t tot_len;
580 struct iovec *iov = *ret_pointer = fast_pointer;
581 ssize_t ret = 0;
582 int seg;
583
584 /*
585 * SuS says "The readv() function *may* fail if the iovcnt argument
586 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
587 * traditionally returned zero for zero segments, so...
588 */
589 if (nr_segs == 0)
590 goto out;
591
592 ret = -EINVAL;
593 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
594 goto out;
595 if (nr_segs > fast_segs) {
596 ret = -ENOMEM;
597 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
598 if (iov == NULL) {
599 *ret_pointer = fast_pointer;
600 goto out;
601 }
602 }
603 *ret_pointer = iov;
604
605 /*
606 * Single unix specification:
607 * We should -EINVAL if an element length is not >= 0 and fitting an
608 * ssize_t. The total length is fitting an ssize_t
609 *
610 * Be careful here because iov_len is a size_t not an ssize_t
611 */
612 tot_len = 0;
613 ret = -EINVAL;
614 for (seg = 0; seg < nr_segs; seg++) {
615 compat_ssize_t tmp = tot_len;
616 compat_uptr_t buf;
617 compat_ssize_t len;
618
619 if (__get_user(len, &uvector->iov_len) ||
620 __get_user(buf, &uvector->iov_base)) {
621 ret = -EFAULT;
622 goto out;
623 }
624 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
625 goto out;
626 tot_len += len;
627 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
628 goto out;
629 if (!access_ok(vrfy_dir(type), buf, len)) {
630 ret = -EFAULT;
631 goto out;
632 }
633 iov->iov_base = compat_ptr(buf);
634 iov->iov_len = (compat_size_t) len;
635 uvector++;
636 iov++;
637 }
638 ret = tot_len;
639
640 out:
641 return ret;
642 }
643
644 static inline long
645 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
646 {
647 compat_uptr_t uptr;
648 int i;
649
650 for (i = 0; i < nr; ++i) {
651 if (get_user(uptr, ptr32 + i))
652 return -EFAULT;
653 if (put_user(compat_ptr(uptr), ptr64 + i))
654 return -EFAULT;
655 }
656 return 0;
657 }
658
659 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
660
661 asmlinkage long
662 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
663 {
664 struct iocb __user * __user *iocb64;
665 long ret;
666
667 if (unlikely(nr < 0))
668 return -EINVAL;
669
670 if (nr > MAX_AIO_SUBMITS)
671 nr = MAX_AIO_SUBMITS;
672
673 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
674 ret = copy_iocb(nr, iocb, iocb64);
675 if (!ret)
676 ret = do_io_submit(ctx_id, nr, iocb64, 1);
677 return ret;
678 }
679
680 struct compat_ncp_mount_data {
681 compat_int_t version;
682 compat_uint_t ncp_fd;
683 __compat_uid_t mounted_uid;
684 compat_pid_t wdog_pid;
685 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
686 compat_uint_t time_out;
687 compat_uint_t retry_count;
688 compat_uint_t flags;
689 __compat_uid_t uid;
690 __compat_gid_t gid;
691 compat_mode_t file_mode;
692 compat_mode_t dir_mode;
693 };
694
695 struct compat_ncp_mount_data_v4 {
696 compat_int_t version;
697 compat_ulong_t flags;
698 compat_ulong_t mounted_uid;
699 compat_long_t wdog_pid;
700 compat_uint_t ncp_fd;
701 compat_uint_t time_out;
702 compat_uint_t retry_count;
703 compat_ulong_t uid;
704 compat_ulong_t gid;
705 compat_ulong_t file_mode;
706 compat_ulong_t dir_mode;
707 };
708
709 static void *do_ncp_super_data_conv(void *raw_data)
710 {
711 int version = *(unsigned int *)raw_data;
712
713 if (version == 3) {
714 struct compat_ncp_mount_data *c_n = raw_data;
715 struct ncp_mount_data *n = raw_data;
716
717 n->dir_mode = c_n->dir_mode;
718 n->file_mode = c_n->file_mode;
719 n->gid = c_n->gid;
720 n->uid = c_n->uid;
721 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
722 n->wdog_pid = c_n->wdog_pid;
723 n->mounted_uid = c_n->mounted_uid;
724 } else if (version == 4) {
725 struct compat_ncp_mount_data_v4 *c_n = raw_data;
726 struct ncp_mount_data_v4 *n = raw_data;
727
728 n->dir_mode = c_n->dir_mode;
729 n->file_mode = c_n->file_mode;
730 n->gid = c_n->gid;
731 n->uid = c_n->uid;
732 n->retry_count = c_n->retry_count;
733 n->time_out = c_n->time_out;
734 n->ncp_fd = c_n->ncp_fd;
735 n->wdog_pid = c_n->wdog_pid;
736 n->mounted_uid = c_n->mounted_uid;
737 n->flags = c_n->flags;
738 } else if (version != 5) {
739 return NULL;
740 }
741
742 return raw_data;
743 }
744
745 struct compat_smb_mount_data {
746 compat_int_t version;
747 __compat_uid_t mounted_uid;
748 __compat_uid_t uid;
749 __compat_gid_t gid;
750 compat_mode_t file_mode;
751 compat_mode_t dir_mode;
752 };
753
754 static void *do_smb_super_data_conv(void *raw_data)
755 {
756 struct smb_mount_data *s = raw_data;
757 struct compat_smb_mount_data *c_s = raw_data;
758
759 if (c_s->version != SMB_MOUNT_OLDVERSION)
760 goto out;
761 s->dir_mode = c_s->dir_mode;
762 s->file_mode = c_s->file_mode;
763 s->gid = c_s->gid;
764 s->uid = c_s->uid;
765 s->mounted_uid = c_s->mounted_uid;
766 out:
767 return raw_data;
768 }
769
770 struct compat_nfs_string {
771 compat_uint_t len;
772 compat_uptr_t data;
773 };
774
775 static inline void compat_nfs_string(struct nfs_string *dst,
776 struct compat_nfs_string *src)
777 {
778 dst->data = compat_ptr(src->data);
779 dst->len = src->len;
780 }
781
782 struct compat_nfs4_mount_data_v1 {
783 compat_int_t version;
784 compat_int_t flags;
785 compat_int_t rsize;
786 compat_int_t wsize;
787 compat_int_t timeo;
788 compat_int_t retrans;
789 compat_int_t acregmin;
790 compat_int_t acregmax;
791 compat_int_t acdirmin;
792 compat_int_t acdirmax;
793 struct compat_nfs_string client_addr;
794 struct compat_nfs_string mnt_path;
795 struct compat_nfs_string hostname;
796 compat_uint_t host_addrlen;
797 compat_uptr_t host_addr;
798 compat_int_t proto;
799 compat_int_t auth_flavourlen;
800 compat_uptr_t auth_flavours;
801 };
802
803 static int do_nfs4_super_data_conv(void *raw_data)
804 {
805 int version = *(compat_uint_t *) raw_data;
806
807 if (version == 1) {
808 struct compat_nfs4_mount_data_v1 *raw = raw_data;
809 struct nfs4_mount_data *real = raw_data;
810
811 /* copy the fields backwards */
812 real->auth_flavours = compat_ptr(raw->auth_flavours);
813 real->auth_flavourlen = raw->auth_flavourlen;
814 real->proto = raw->proto;
815 real->host_addr = compat_ptr(raw->host_addr);
816 real->host_addrlen = raw->host_addrlen;
817 compat_nfs_string(&real->hostname, &raw->hostname);
818 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
819 compat_nfs_string(&real->client_addr, &raw->client_addr);
820 real->acdirmax = raw->acdirmax;
821 real->acdirmin = raw->acdirmin;
822 real->acregmax = raw->acregmax;
823 real->acregmin = raw->acregmin;
824 real->retrans = raw->retrans;
825 real->timeo = raw->timeo;
826 real->wsize = raw->wsize;
827 real->rsize = raw->rsize;
828 real->flags = raw->flags;
829 real->version = raw->version;
830 }
831
832 return 0;
833 }
834
835 #define SMBFS_NAME "smbfs"
836 #define NCPFS_NAME "ncpfs"
837 #define NFS4_NAME "nfs4"
838
839 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
840 char __user * type, unsigned long flags,
841 void __user * data)
842 {
843 char *kernel_type;
844 unsigned long data_page;
845 char *kernel_dev;
846 char *dir_page;
847 int retval;
848
849 retval = copy_mount_string(type, &kernel_type);
850 if (retval < 0)
851 goto out;
852
853 dir_page = getname(dir_name);
854 retval = PTR_ERR(dir_page);
855 if (IS_ERR(dir_page))
856 goto out1;
857
858 retval = copy_mount_string(dev_name, &kernel_dev);
859 if (retval < 0)
860 goto out2;
861
862 retval = copy_mount_options(data, &data_page);
863 if (retval < 0)
864 goto out3;
865
866 retval = -EINVAL;
867
868 if (kernel_type && data_page) {
869 if (!strcmp(kernel_type, SMBFS_NAME)) {
870 do_smb_super_data_conv((void *)data_page);
871 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
872 do_ncp_super_data_conv((void *)data_page);
873 } else if (!strcmp(kernel_type, NFS4_NAME)) {
874 if (do_nfs4_super_data_conv((void *) data_page))
875 goto out4;
876 }
877 }
878
879 retval = do_mount(kernel_dev, dir_page, kernel_type,
880 flags, (void*)data_page);
881
882 out4:
883 free_page(data_page);
884 out3:
885 kfree(kernel_dev);
886 out2:
887 putname(dir_page);
888 out1:
889 kfree(kernel_type);
890 out:
891 return retval;
892 }
893
894 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
895
896 struct compat_old_linux_dirent {
897 compat_ulong_t d_ino;
898 compat_ulong_t d_offset;
899 unsigned short d_namlen;
900 char d_name[1];
901 };
902
903 struct compat_readdir_callback {
904 struct compat_old_linux_dirent __user *dirent;
905 int result;
906 };
907
908 static int compat_fillonedir(void *__buf, const char *name, int namlen,
909 loff_t offset, u64 ino, unsigned int d_type)
910 {
911 struct compat_readdir_callback *buf = __buf;
912 struct compat_old_linux_dirent __user *dirent;
913 compat_ulong_t d_ino;
914
915 if (buf->result)
916 return -EINVAL;
917 d_ino = ino;
918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->result = -EOVERFLOW;
920 return -EOVERFLOW;
921 }
922 buf->result++;
923 dirent = buf->dirent;
924 if (!access_ok(VERIFY_WRITE, dirent,
925 (unsigned long)(dirent->d_name + namlen + 1) -
926 (unsigned long)dirent))
927 goto efault;
928 if ( __put_user(d_ino, &dirent->d_ino) ||
929 __put_user(offset, &dirent->d_offset) ||
930 __put_user(namlen, &dirent->d_namlen) ||
931 __copy_to_user(dirent->d_name, name, namlen) ||
932 __put_user(0, dirent->d_name + namlen))
933 goto efault;
934 return 0;
935 efault:
936 buf->result = -EFAULT;
937 return -EFAULT;
938 }
939
940 asmlinkage long compat_sys_old_readdir(unsigned int fd,
941 struct compat_old_linux_dirent __user *dirent, unsigned int count)
942 {
943 int error;
944 struct file *file;
945 struct compat_readdir_callback buf;
946
947 error = -EBADF;
948 file = fget(fd);
949 if (!file)
950 goto out;
951
952 buf.result = 0;
953 buf.dirent = dirent;
954
955 error = vfs_readdir(file, compat_fillonedir, &buf);
956 if (buf.result)
957 error = buf.result;
958
959 fput(file);
960 out:
961 return error;
962 }
963
964 struct compat_linux_dirent {
965 compat_ulong_t d_ino;
966 compat_ulong_t d_off;
967 unsigned short d_reclen;
968 char d_name[1];
969 };
970
971 struct compat_getdents_callback {
972 struct compat_linux_dirent __user *current_dir;
973 struct compat_linux_dirent __user *previous;
974 int count;
975 int error;
976 };
977
978 static int compat_filldir(void *__buf, const char *name, int namlen,
979 loff_t offset, u64 ino, unsigned int d_type)
980 {
981 struct compat_linux_dirent __user * dirent;
982 struct compat_getdents_callback *buf = __buf;
983 compat_ulong_t d_ino;
984 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
985
986 buf->error = -EINVAL; /* only used if we fail.. */
987 if (reclen > buf->count)
988 return -EINVAL;
989 d_ino = ino;
990 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
991 buf->error = -EOVERFLOW;
992 return -EOVERFLOW;
993 }
994 dirent = buf->previous;
995 if (dirent) {
996 if (__put_user(offset, &dirent->d_off))
997 goto efault;
998 }
999 dirent = buf->current_dir;
1000 if (__put_user(d_ino, &dirent->d_ino))
1001 goto efault;
1002 if (__put_user(reclen, &dirent->d_reclen))
1003 goto efault;
1004 if (copy_to_user(dirent->d_name, name, namlen))
1005 goto efault;
1006 if (__put_user(0, dirent->d_name + namlen))
1007 goto efault;
1008 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1009 goto efault;
1010 buf->previous = dirent;
1011 dirent = (void __user *)dirent + reclen;
1012 buf->current_dir = dirent;
1013 buf->count -= reclen;
1014 return 0;
1015 efault:
1016 buf->error = -EFAULT;
1017 return -EFAULT;
1018 }
1019
1020 asmlinkage long compat_sys_getdents(unsigned int fd,
1021 struct compat_linux_dirent __user *dirent, unsigned int count)
1022 {
1023 struct file * file;
1024 struct compat_linux_dirent __user * lastdirent;
1025 struct compat_getdents_callback buf;
1026 int error;
1027
1028 error = -EFAULT;
1029 if (!access_ok(VERIFY_WRITE, dirent, count))
1030 goto out;
1031
1032 error = -EBADF;
1033 file = fget(fd);
1034 if (!file)
1035 goto out;
1036
1037 buf.current_dir = dirent;
1038 buf.previous = NULL;
1039 buf.count = count;
1040 buf.error = 0;
1041
1042 error = vfs_readdir(file, compat_filldir, &buf);
1043 if (error >= 0)
1044 error = buf.error;
1045 lastdirent = buf.previous;
1046 if (lastdirent) {
1047 if (put_user(file->f_pos, &lastdirent->d_off))
1048 error = -EFAULT;
1049 else
1050 error = count - buf.count;
1051 }
1052 fput(file);
1053 out:
1054 return error;
1055 }
1056
1057 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1058
1059 struct compat_getdents_callback64 {
1060 struct linux_dirent64 __user *current_dir;
1061 struct linux_dirent64 __user *previous;
1062 int count;
1063 int error;
1064 };
1065
1066 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1067 u64 ino, unsigned int d_type)
1068 {
1069 struct linux_dirent64 __user *dirent;
1070 struct compat_getdents_callback64 *buf = __buf;
1071 int jj = NAME_OFFSET(dirent);
1072 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1073 u64 off;
1074
1075 buf->error = -EINVAL; /* only used if we fail.. */
1076 if (reclen > buf->count)
1077 return -EINVAL;
1078 dirent = buf->previous;
1079
1080 if (dirent) {
1081 if (__put_user_unaligned(offset, &dirent->d_off))
1082 goto efault;
1083 }
1084 dirent = buf->current_dir;
1085 if (__put_user_unaligned(ino, &dirent->d_ino))
1086 goto efault;
1087 off = 0;
1088 if (__put_user_unaligned(off, &dirent->d_off))
1089 goto efault;
1090 if (__put_user(reclen, &dirent->d_reclen))
1091 goto efault;
1092 if (__put_user(d_type, &dirent->d_type))
1093 goto efault;
1094 if (copy_to_user(dirent->d_name, name, namlen))
1095 goto efault;
1096 if (__put_user(0, dirent->d_name + namlen))
1097 goto efault;
1098 buf->previous = dirent;
1099 dirent = (void __user *)dirent + reclen;
1100 buf->current_dir = dirent;
1101 buf->count -= reclen;
1102 return 0;
1103 efault:
1104 buf->error = -EFAULT;
1105 return -EFAULT;
1106 }
1107
1108 asmlinkage long compat_sys_getdents64(unsigned int fd,
1109 struct linux_dirent64 __user * dirent, unsigned int count)
1110 {
1111 struct file * file;
1112 struct linux_dirent64 __user * lastdirent;
1113 struct compat_getdents_callback64 buf;
1114 int error;
1115
1116 error = -EFAULT;
1117 if (!access_ok(VERIFY_WRITE, dirent, count))
1118 goto out;
1119
1120 error = -EBADF;
1121 file = fget(fd);
1122 if (!file)
1123 goto out;
1124
1125 buf.current_dir = dirent;
1126 buf.previous = NULL;
1127 buf.count = count;
1128 buf.error = 0;
1129
1130 error = vfs_readdir(file, compat_filldir64, &buf);
1131 if (error >= 0)
1132 error = buf.error;
1133 lastdirent = buf.previous;
1134 if (lastdirent) {
1135 typeof(lastdirent->d_off) d_off = file->f_pos;
1136 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1137 error = -EFAULT;
1138 else
1139 error = count - buf.count;
1140 }
1141 fput(file);
1142 out:
1143 return error;
1144 }
1145 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1146
1147 static ssize_t compat_do_readv_writev(int type, struct file *file,
1148 const struct compat_iovec __user *uvector,
1149 unsigned long nr_segs, loff_t *pos)
1150 {
1151 compat_ssize_t tot_len;
1152 struct iovec iovstack[UIO_FASTIOV];
1153 struct iovec *iov;
1154 ssize_t ret;
1155 io_fn_t fn;
1156 iov_fn_t fnv;
1157
1158 ret = -EINVAL;
1159 if (!file->f_op)
1160 goto out;
1161
1162 ret = -EFAULT;
1163 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1164 goto out;
1165
1166 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1167 UIO_FASTIOV, iovstack, &iov);
1168 if (tot_len == 0) {
1169 ret = 0;
1170 goto out;
1171 }
1172
1173 ret = rw_verify_area(type, file, pos, tot_len);
1174 if (ret < 0)
1175 goto out;
1176
1177 fnv = NULL;
1178 if (type == READ) {
1179 fn = file->f_op->read;
1180 fnv = file->f_op->aio_read;
1181 } else {
1182 fn = (io_fn_t)file->f_op->write;
1183 fnv = file->f_op->aio_write;
1184 }
1185
1186 if (fnv)
1187 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1188 pos, fnv);
1189 else
1190 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1191
1192 out:
1193 if (iov != iovstack)
1194 kfree(iov);
1195 if ((ret + (type == READ)) > 0) {
1196 struct dentry *dentry = file->f_path.dentry;
1197 if (type == READ)
1198 fsnotify_access(dentry);
1199 else
1200 fsnotify_modify(dentry);
1201 }
1202 return ret;
1203 }
1204
1205 static size_t compat_readv(struct file *file,
1206 const struct compat_iovec __user *vec,
1207 unsigned long vlen, loff_t *pos)
1208 {
1209 ssize_t ret = -EBADF;
1210
1211 if (!(file->f_mode & FMODE_READ))
1212 goto out;
1213
1214 ret = -EINVAL;
1215 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1216 goto out;
1217
1218 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1219
1220 out:
1221 if (ret > 0)
1222 add_rchar(current, ret);
1223 inc_syscr(current);
1224 return ret;
1225 }
1226
1227 asmlinkage ssize_t
1228 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1229 unsigned long vlen)
1230 {
1231 struct file *file;
1232 int fput_needed;
1233 ssize_t ret;
1234
1235 file = fget_light(fd, &fput_needed);
1236 if (!file)
1237 return -EBADF;
1238 ret = compat_readv(file, vec, vlen, &file->f_pos);
1239 fput_light(file, fput_needed);
1240 return ret;
1241 }
1242
1243 asmlinkage ssize_t
1244 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1245 unsigned long vlen, u32 pos_low, u32 pos_high)
1246 {
1247 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1248 struct file *file;
1249 int fput_needed;
1250 ssize_t ret;
1251
1252 if (pos < 0)
1253 return -EINVAL;
1254 file = fget_light(fd, &fput_needed);
1255 if (!file)
1256 return -EBADF;
1257 ret = compat_readv(file, vec, vlen, &pos);
1258 fput_light(file, fput_needed);
1259 return ret;
1260 }
1261
1262 static size_t compat_writev(struct file *file,
1263 const struct compat_iovec __user *vec,
1264 unsigned long vlen, loff_t *pos)
1265 {
1266 ssize_t ret = -EBADF;
1267
1268 if (!(file->f_mode & FMODE_WRITE))
1269 goto out;
1270
1271 ret = -EINVAL;
1272 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1273 goto out;
1274
1275 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1276
1277 out:
1278 if (ret > 0)
1279 add_wchar(current, ret);
1280 inc_syscw(current);
1281 return ret;
1282 }
1283
1284 asmlinkage ssize_t
1285 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1286 unsigned long vlen)
1287 {
1288 struct file *file;
1289 int fput_needed;
1290 ssize_t ret;
1291
1292 file = fget_light(fd, &fput_needed);
1293 if (!file)
1294 return -EBADF;
1295 ret = compat_writev(file, vec, vlen, &file->f_pos);
1296 fput_light(file, fput_needed);
1297 return ret;
1298 }
1299
1300 asmlinkage ssize_t
1301 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1302 unsigned long vlen, u32 pos_low, u32 pos_high)
1303 {
1304 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1305 struct file *file;
1306 int fput_needed;
1307 ssize_t ret;
1308
1309 if (pos < 0)
1310 return -EINVAL;
1311 file = fget_light(fd, &fput_needed);
1312 if (!file)
1313 return -EBADF;
1314 ret = compat_writev(file, vec, vlen, &pos);
1315 fput_light(file, fput_needed);
1316 return ret;
1317 }
1318
1319 asmlinkage long
1320 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1321 unsigned int nr_segs, unsigned int flags)
1322 {
1323 unsigned i;
1324 struct iovec __user *iov;
1325 if (nr_segs > UIO_MAXIOV)
1326 return -EINVAL;
1327 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1328 for (i = 0; i < nr_segs; i++) {
1329 struct compat_iovec v;
1330 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1331 get_user(v.iov_len, &iov32[i].iov_len) ||
1332 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1333 put_user(v.iov_len, &iov[i].iov_len))
1334 return -EFAULT;
1335 }
1336 return sys_vmsplice(fd, iov, nr_segs, flags);
1337 }
1338
1339 /*
1340 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1341 * O_LARGEFILE flag.
1342 */
1343 asmlinkage long
1344 compat_sys_open(const char __user *filename, int flags, int mode)
1345 {
1346 return do_sys_open(AT_FDCWD, filename, flags, mode);
1347 }
1348
1349 /*
1350 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1351 * O_LARGEFILE flag.
1352 */
1353 asmlinkage long
1354 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1355 {
1356 return do_sys_open(dfd, filename, flags, mode);
1357 }
1358
1359 /*
1360 * compat_count() counts the number of arguments/envelopes. It is basically
1361 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1362 * and envp pointers.
1363 */
1364 static int compat_count(compat_uptr_t __user *argv, int max)
1365 {
1366 int i = 0;
1367
1368 if (argv != NULL) {
1369 for (;;) {
1370 compat_uptr_t p;
1371
1372 if (get_user(p, argv))
1373 return -EFAULT;
1374 if (!p)
1375 break;
1376 argv++;
1377 if (i++ >= max)
1378 return -E2BIG;
1379 }
1380 }
1381 return i;
1382 }
1383
1384 /*
1385 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1386 * except that it works with 32 bit argv and envp pointers.
1387 */
1388 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1389 struct linux_binprm *bprm)
1390 {
1391 struct page *kmapped_page = NULL;
1392 char *kaddr = NULL;
1393 unsigned long kpos = 0;
1394 int ret;
1395
1396 while (argc-- > 0) {
1397 compat_uptr_t str;
1398 int len;
1399 unsigned long pos;
1400
1401 if (get_user(str, argv+argc) ||
1402 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1403 ret = -EFAULT;
1404 goto out;
1405 }
1406
1407 if (len > MAX_ARG_STRLEN) {
1408 ret = -E2BIG;
1409 goto out;
1410 }
1411
1412 /* We're going to work our way backwords. */
1413 pos = bprm->p;
1414 str += len;
1415 bprm->p -= len;
1416
1417 while (len > 0) {
1418 int offset, bytes_to_copy;
1419
1420 offset = pos % PAGE_SIZE;
1421 if (offset == 0)
1422 offset = PAGE_SIZE;
1423
1424 bytes_to_copy = offset;
1425 if (bytes_to_copy > len)
1426 bytes_to_copy = len;
1427
1428 offset -= bytes_to_copy;
1429 pos -= bytes_to_copy;
1430 str -= bytes_to_copy;
1431 len -= bytes_to_copy;
1432
1433 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1434 struct page *page;
1435
1436 #ifdef CONFIG_STACK_GROWSUP
1437 ret = expand_stack_downwards(bprm->vma, pos);
1438 if (ret < 0) {
1439 /* We've exceed the stack rlimit. */
1440 ret = -E2BIG;
1441 goto out;
1442 }
1443 #endif
1444 ret = get_user_pages(current, bprm->mm, pos,
1445 1, 1, 1, &page, NULL);
1446 if (ret <= 0) {
1447 /* We've exceed the stack rlimit. */
1448 ret = -E2BIG;
1449 goto out;
1450 }
1451
1452 if (kmapped_page) {
1453 flush_kernel_dcache_page(kmapped_page);
1454 kunmap(kmapped_page);
1455 put_page(kmapped_page);
1456 }
1457 kmapped_page = page;
1458 kaddr = kmap(kmapped_page);
1459 kpos = pos & PAGE_MASK;
1460 flush_cache_page(bprm->vma, kpos,
1461 page_to_pfn(kmapped_page));
1462 }
1463 if (copy_from_user(kaddr+offset, compat_ptr(str),
1464 bytes_to_copy)) {
1465 ret = -EFAULT;
1466 goto out;
1467 }
1468 }
1469 }
1470 ret = 0;
1471 out:
1472 if (kmapped_page) {
1473 flush_kernel_dcache_page(kmapped_page);
1474 kunmap(kmapped_page);
1475 put_page(kmapped_page);
1476 }
1477 return ret;
1478 }
1479
1480 /*
1481 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1482 * that it processes 32 bit argv and envp pointers.
1483 */
1484 int compat_do_execve(char * filename,
1485 compat_uptr_t __user *argv,
1486 compat_uptr_t __user *envp,
1487 struct pt_regs * regs)
1488 {
1489 struct linux_binprm *bprm;
1490 struct file *file;
1491 struct files_struct *displaced;
1492 bool clear_in_exec;
1493 int retval;
1494
1495 retval = unshare_files(&displaced);
1496 if (retval)
1497 goto out_ret;
1498
1499 retval = -ENOMEM;
1500 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1501 if (!bprm)
1502 goto out_files;
1503
1504 retval = prepare_bprm_creds(bprm);
1505 if (retval)
1506 goto out_free;
1507
1508 retval = check_unsafe_exec(bprm);
1509 if (retval < 0)
1510 goto out_free;
1511 clear_in_exec = retval;
1512 current->in_execve = 1;
1513
1514 file = open_exec(filename);
1515 retval = PTR_ERR(file);
1516 if (IS_ERR(file))
1517 goto out_unmark;
1518
1519 sched_exec();
1520
1521 bprm->file = file;
1522 bprm->filename = filename;
1523 bprm->interp = filename;
1524
1525 retval = bprm_mm_init(bprm);
1526 if (retval)
1527 goto out_file;
1528
1529 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1530 if ((retval = bprm->argc) < 0)
1531 goto out;
1532
1533 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1534 if ((retval = bprm->envc) < 0)
1535 goto out;
1536
1537 retval = prepare_binprm(bprm);
1538 if (retval < 0)
1539 goto out;
1540
1541 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1542 if (retval < 0)
1543 goto out;
1544
1545 bprm->exec = bprm->p;
1546 retval = compat_copy_strings(bprm->envc, envp, bprm);
1547 if (retval < 0)
1548 goto out;
1549
1550 retval = compat_copy_strings(bprm->argc, argv, bprm);
1551 if (retval < 0)
1552 goto out;
1553
1554 retval = search_binary_handler(bprm, regs);
1555 if (retval < 0)
1556 goto out;
1557
1558 /* execve succeeded */
1559 current->fs->in_exec = 0;
1560 current->in_execve = 0;
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 if (clear_in_exec)
1579 current->fs->in_exec = 0;
1580 current->in_execve = 0;
1581
1582 out_free:
1583 free_bprm(bprm);
1584
1585 out_files:
1586 if (displaced)
1587 reset_files_struct(displaced);
1588 out_ret:
1589 return retval;
1590 }
1591
1592 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1593
1594 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1595 int timeval, int ret)
1596 {
1597 struct timespec ts;
1598
1599 if (!p)
1600 return ret;
1601
1602 if (current->personality & STICKY_TIMEOUTS)
1603 goto sticky;
1604
1605 /* No update for zero timeout */
1606 if (!end_time->tv_sec && !end_time->tv_nsec)
1607 return ret;
1608
1609 ktime_get_ts(&ts);
1610 ts = timespec_sub(*end_time, ts);
1611 if (ts.tv_sec < 0)
1612 ts.tv_sec = ts.tv_nsec = 0;
1613
1614 if (timeval) {
1615 struct compat_timeval rtv;
1616
1617 rtv.tv_sec = ts.tv_sec;
1618 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1619
1620 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1621 return ret;
1622 } else {
1623 struct compat_timespec rts;
1624
1625 rts.tv_sec = ts.tv_sec;
1626 rts.tv_nsec = ts.tv_nsec;
1627
1628 if (!copy_to_user(p, &rts, sizeof(rts)))
1629 return ret;
1630 }
1631 /*
1632 * If an application puts its timeval in read-only memory, we
1633 * don't want the Linux-specific update to the timeval to
1634 * cause a fault after the select has completed
1635 * successfully. However, because we're not updating the
1636 * timeval, we can't restart the system call.
1637 */
1638
1639 sticky:
1640 if (ret == -ERESTARTNOHAND)
1641 ret = -EINTR;
1642 return ret;
1643 }
1644
1645 /*
1646 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1647 * 64-bit unsigned longs.
1648 */
1649 static
1650 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1651 unsigned long *fdset)
1652 {
1653 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1654 if (ufdset) {
1655 unsigned long odd;
1656
1657 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1658 return -EFAULT;
1659
1660 odd = nr & 1UL;
1661 nr &= ~1UL;
1662 while (nr) {
1663 unsigned long h, l;
1664 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1665 return -EFAULT;
1666 ufdset += 2;
1667 *fdset++ = h << 32 | l;
1668 nr -= 2;
1669 }
1670 if (odd && __get_user(*fdset, ufdset))
1671 return -EFAULT;
1672 } else {
1673 /* Tricky, must clear full unsigned long in the
1674 * kernel fdset at the end, this makes sure that
1675 * actually happens.
1676 */
1677 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1678 }
1679 return 0;
1680 }
1681
1682 static
1683 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1684 unsigned long *fdset)
1685 {
1686 unsigned long odd;
1687 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1688
1689 if (!ufdset)
1690 return 0;
1691
1692 odd = nr & 1UL;
1693 nr &= ~1UL;
1694 while (nr) {
1695 unsigned long h, l;
1696 l = *fdset++;
1697 h = l >> 32;
1698 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1699 return -EFAULT;
1700 ufdset += 2;
1701 nr -= 2;
1702 }
1703 if (odd && __put_user(*fdset, ufdset))
1704 return -EFAULT;
1705 return 0;
1706 }
1707
1708
1709 /*
1710 * This is a virtual copy of sys_select from fs/select.c and probably
1711 * should be compared to it from time to time
1712 */
1713
1714 /*
1715 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1716 * like to be certain this leads to no problems. So I return
1717 * EINTR just for safety.
1718 *
1719 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1720 * I'm trying ERESTARTNOHAND which restart only when you want to.
1721 */
1722 #define MAX_SELECT_SECONDS \
1723 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1724
1725 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1726 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1727 struct timespec *end_time)
1728 {
1729 fd_set_bits fds;
1730 void *bits;
1731 int size, max_fds, ret = -EINVAL;
1732 struct fdtable *fdt;
1733 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1734
1735 if (n < 0)
1736 goto out_nofds;
1737
1738 /* max_fds can increase, so grab it once to avoid race */
1739 rcu_read_lock();
1740 fdt = files_fdtable(current->files);
1741 max_fds = fdt->max_fds;
1742 rcu_read_unlock();
1743 if (n > max_fds)
1744 n = max_fds;
1745
1746 /*
1747 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1748 * since we used fdset we need to allocate memory in units of
1749 * long-words.
1750 */
1751 size = FDS_BYTES(n);
1752 bits = stack_fds;
1753 if (size > sizeof(stack_fds) / 6) {
1754 bits = kmalloc(6 * size, GFP_KERNEL);
1755 ret = -ENOMEM;
1756 if (!bits)
1757 goto out_nofds;
1758 }
1759 fds.in = (unsigned long *) bits;
1760 fds.out = (unsigned long *) (bits + size);
1761 fds.ex = (unsigned long *) (bits + 2*size);
1762 fds.res_in = (unsigned long *) (bits + 3*size);
1763 fds.res_out = (unsigned long *) (bits + 4*size);
1764 fds.res_ex = (unsigned long *) (bits + 5*size);
1765
1766 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1767 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1768 (ret = compat_get_fd_set(n, exp, fds.ex)))
1769 goto out;
1770 zero_fd_set(n, fds.res_in);
1771 zero_fd_set(n, fds.res_out);
1772 zero_fd_set(n, fds.res_ex);
1773
1774 ret = do_select(n, &fds, end_time);
1775
1776 if (ret < 0)
1777 goto out;
1778 if (!ret) {
1779 ret = -ERESTARTNOHAND;
1780 if (signal_pending(current))
1781 goto out;
1782 ret = 0;
1783 }
1784
1785 if (compat_set_fd_set(n, inp, fds.res_in) ||
1786 compat_set_fd_set(n, outp, fds.res_out) ||
1787 compat_set_fd_set(n, exp, fds.res_ex))
1788 ret = -EFAULT;
1789 out:
1790 if (bits != stack_fds)
1791 kfree(bits);
1792 out_nofds:
1793 return ret;
1794 }
1795
1796 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1797 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1798 struct compat_timeval __user *tvp)
1799 {
1800 struct timespec end_time, *to = NULL;
1801 struct compat_timeval tv;
1802 int ret;
1803
1804 if (tvp) {
1805 if (copy_from_user(&tv, tvp, sizeof(tv)))
1806 return -EFAULT;
1807
1808 to = &end_time;
1809 if (poll_select_set_timeout(to,
1810 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1811 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1812 return -EINVAL;
1813 }
1814
1815 ret = compat_core_sys_select(n, inp, outp, exp, to);
1816 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1817
1818 return ret;
1819 }
1820
1821 struct compat_sel_arg_struct {
1822 compat_ulong_t n;
1823 compat_uptr_t inp;
1824 compat_uptr_t outp;
1825 compat_uptr_t exp;
1826 compat_uptr_t tvp;
1827 };
1828
1829 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1830 {
1831 struct compat_sel_arg_struct a;
1832
1833 if (copy_from_user(&a, arg, sizeof(a)))
1834 return -EFAULT;
1835 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1836 compat_ptr(a.exp), compat_ptr(a.tvp));
1837 }
1838
1839 #ifdef HAVE_SET_RESTORE_SIGMASK
1840 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1841 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1842 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1843 compat_size_t sigsetsize)
1844 {
1845 compat_sigset_t ss32;
1846 sigset_t ksigmask, sigsaved;
1847 struct compat_timespec ts;
1848 struct timespec end_time, *to = NULL;
1849 int ret;
1850
1851 if (tsp) {
1852 if (copy_from_user(&ts, tsp, sizeof(ts)))
1853 return -EFAULT;
1854
1855 to = &end_time;
1856 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1857 return -EINVAL;
1858 }
1859
1860 if (sigmask) {
1861 if (sigsetsize != sizeof(compat_sigset_t))
1862 return -EINVAL;
1863 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1864 return -EFAULT;
1865 sigset_from_compat(&ksigmask, &ss32);
1866
1867 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1868 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1869 }
1870
1871 ret = compat_core_sys_select(n, inp, outp, exp, to);
1872 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1873
1874 if (ret == -ERESTARTNOHAND) {
1875 /*
1876 * Don't restore the signal mask yet. Let do_signal() deliver
1877 * the signal on the way back to userspace, before the signal
1878 * mask is restored.
1879 */
1880 if (sigmask) {
1881 memcpy(&current->saved_sigmask, &sigsaved,
1882 sizeof(sigsaved));
1883 set_restore_sigmask();
1884 }
1885 } else if (sigmask)
1886 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1887
1888 return ret;
1889 }
1890
1891 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1892 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1893 struct compat_timespec __user *tsp, void __user *sig)
1894 {
1895 compat_size_t sigsetsize = 0;
1896 compat_uptr_t up = 0;
1897
1898 if (sig) {
1899 if (!access_ok(VERIFY_READ, sig,
1900 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1901 __get_user(up, (compat_uptr_t __user *)sig) ||
1902 __get_user(sigsetsize,
1903 (compat_size_t __user *)(sig+sizeof(up))))
1904 return -EFAULT;
1905 }
1906 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1907 sigsetsize);
1908 }
1909
1910 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1911 unsigned int nfds, struct compat_timespec __user *tsp,
1912 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1913 {
1914 compat_sigset_t ss32;
1915 sigset_t ksigmask, sigsaved;
1916 struct compat_timespec ts;
1917 struct timespec end_time, *to = NULL;
1918 int ret;
1919
1920 if (tsp) {
1921 if (copy_from_user(&ts, tsp, sizeof(ts)))
1922 return -EFAULT;
1923
1924 to = &end_time;
1925 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1926 return -EINVAL;
1927 }
1928
1929 if (sigmask) {
1930 if (sigsetsize != sizeof(compat_sigset_t))
1931 return -EINVAL;
1932 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1933 return -EFAULT;
1934 sigset_from_compat(&ksigmask, &ss32);
1935
1936 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1937 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1938 }
1939
1940 ret = do_sys_poll(ufds, nfds, to);
1941
1942 /* We can restart this syscall, usually */
1943 if (ret == -EINTR) {
1944 /*
1945 * Don't restore the signal mask yet. Let do_signal() deliver
1946 * the signal on the way back to userspace, before the signal
1947 * mask is restored.
1948 */
1949 if (sigmask) {
1950 memcpy(&current->saved_sigmask, &sigsaved,
1951 sizeof(sigsaved));
1952 set_restore_sigmask();
1953 }
1954 ret = -ERESTARTNOHAND;
1955 } else if (sigmask)
1956 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1957
1958 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1959
1960 return ret;
1961 }
1962 #endif /* HAVE_SET_RESTORE_SIGMASK */
1963
1964 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1965 /* Stuff for NFS server syscalls... */
1966 struct compat_nfsctl_svc {
1967 u16 svc32_port;
1968 s32 svc32_nthreads;
1969 };
1970
1971 struct compat_nfsctl_client {
1972 s8 cl32_ident[NFSCLNT_IDMAX+1];
1973 s32 cl32_naddr;
1974 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1975 s32 cl32_fhkeytype;
1976 s32 cl32_fhkeylen;
1977 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1978 };
1979
1980 struct compat_nfsctl_export {
1981 char ex32_client[NFSCLNT_IDMAX+1];
1982 char ex32_path[NFS_MAXPATHLEN+1];
1983 compat_dev_t ex32_dev;
1984 compat_ino_t ex32_ino;
1985 compat_int_t ex32_flags;
1986 __compat_uid_t ex32_anon_uid;
1987 __compat_gid_t ex32_anon_gid;
1988 };
1989
1990 struct compat_nfsctl_fdparm {
1991 struct sockaddr gd32_addr;
1992 s8 gd32_path[NFS_MAXPATHLEN+1];
1993 compat_int_t gd32_version;
1994 };
1995
1996 struct compat_nfsctl_fsparm {
1997 struct sockaddr gd32_addr;
1998 s8 gd32_path[NFS_MAXPATHLEN+1];
1999 compat_int_t gd32_maxlen;
2000 };
2001
2002 struct compat_nfsctl_arg {
2003 compat_int_t ca32_version; /* safeguard */
2004 union {
2005 struct compat_nfsctl_svc u32_svc;
2006 struct compat_nfsctl_client u32_client;
2007 struct compat_nfsctl_export u32_export;
2008 struct compat_nfsctl_fdparm u32_getfd;
2009 struct compat_nfsctl_fsparm u32_getfs;
2010 } u;
2011 #define ca32_svc u.u32_svc
2012 #define ca32_client u.u32_client
2013 #define ca32_export u.u32_export
2014 #define ca32_getfd u.u32_getfd
2015 #define ca32_getfs u.u32_getfs
2016 };
2017
2018 union compat_nfsctl_res {
2019 __u8 cr32_getfh[NFS_FHSIZE];
2020 struct knfsd_fh cr32_getfs;
2021 };
2022
2023 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2024 struct compat_nfsctl_arg __user *arg)
2025 {
2026 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2027 get_user(karg->ca_version, &arg->ca32_version) ||
2028 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2029 __get_user(karg->ca_svc.svc_nthreads,
2030 &arg->ca32_svc.svc32_nthreads))
2031 return -EFAULT;
2032 return 0;
2033 }
2034
2035 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2036 struct compat_nfsctl_arg __user *arg)
2037 {
2038 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2039 sizeof(arg->ca32_client)) ||
2040 get_user(karg->ca_version, &arg->ca32_version) ||
2041 __copy_from_user(&karg->ca_client.cl_ident[0],
2042 &arg->ca32_client.cl32_ident[0],
2043 NFSCLNT_IDMAX) ||
2044 __get_user(karg->ca_client.cl_naddr,
2045 &arg->ca32_client.cl32_naddr) ||
2046 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2047 &arg->ca32_client.cl32_addrlist[0],
2048 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2049 __get_user(karg->ca_client.cl_fhkeytype,
2050 &arg->ca32_client.cl32_fhkeytype) ||
2051 __get_user(karg->ca_client.cl_fhkeylen,
2052 &arg->ca32_client.cl32_fhkeylen) ||
2053 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2054 &arg->ca32_client.cl32_fhkey[0],
2055 NFSCLNT_KEYMAX))
2056 return -EFAULT;
2057
2058 return 0;
2059 }
2060
2061 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2062 struct compat_nfsctl_arg __user *arg)
2063 {
2064 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2065 sizeof(arg->ca32_export)) ||
2066 get_user(karg->ca_version, &arg->ca32_version) ||
2067 __copy_from_user(&karg->ca_export.ex_client[0],
2068 &arg->ca32_export.ex32_client[0],
2069 NFSCLNT_IDMAX) ||
2070 __copy_from_user(&karg->ca_export.ex_path[0],
2071 &arg->ca32_export.ex32_path[0],
2072 NFS_MAXPATHLEN) ||
2073 __get_user(karg->ca_export.ex_dev,
2074 &arg->ca32_export.ex32_dev) ||
2075 __get_user(karg->ca_export.ex_ino,
2076 &arg->ca32_export.ex32_ino) ||
2077 __get_user(karg->ca_export.ex_flags,
2078 &arg->ca32_export.ex32_flags) ||
2079 __get_user(karg->ca_export.ex_anon_uid,
2080 &arg->ca32_export.ex32_anon_uid) ||
2081 __get_user(karg->ca_export.ex_anon_gid,
2082 &arg->ca32_export.ex32_anon_gid))
2083 return -EFAULT;
2084 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2085 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2086
2087 return 0;
2088 }
2089
2090 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2091 struct compat_nfsctl_arg __user *arg)
2092 {
2093 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2094 sizeof(arg->ca32_getfd)) ||
2095 get_user(karg->ca_version, &arg->ca32_version) ||
2096 __copy_from_user(&karg->ca_getfd.gd_addr,
2097 &arg->ca32_getfd.gd32_addr,
2098 (sizeof(struct sockaddr))) ||
2099 __copy_from_user(&karg->ca_getfd.gd_path,
2100 &arg->ca32_getfd.gd32_path,
2101 (NFS_MAXPATHLEN+1)) ||
2102 __get_user(karg->ca_getfd.gd_version,
2103 &arg->ca32_getfd.gd32_version))
2104 return -EFAULT;
2105
2106 return 0;
2107 }
2108
2109 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2110 struct compat_nfsctl_arg __user *arg)
2111 {
2112 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2113 get_user(karg->ca_version, &arg->ca32_version) ||
2114 __copy_from_user(&karg->ca_getfs.gd_addr,
2115 &arg->ca32_getfs.gd32_addr,
2116 (sizeof(struct sockaddr))) ||
2117 __copy_from_user(&karg->ca_getfs.gd_path,
2118 &arg->ca32_getfs.gd32_path,
2119 (NFS_MAXPATHLEN+1)) ||
2120 __get_user(karg->ca_getfs.gd_maxlen,
2121 &arg->ca32_getfs.gd32_maxlen))
2122 return -EFAULT;
2123
2124 return 0;
2125 }
2126
2127 /* This really doesn't need translations, we are only passing
2128 * back a union which contains opaque nfs file handle data.
2129 */
2130 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2131 union compat_nfsctl_res __user *res)
2132 {
2133 int err;
2134
2135 err = copy_to_user(res, kres, sizeof(*res));
2136
2137 return (err) ? -EFAULT : 0;
2138 }
2139
2140 asmlinkage long compat_sys_nfsservctl(int cmd,
2141 struct compat_nfsctl_arg __user *arg,
2142 union compat_nfsctl_res __user *res)
2143 {
2144 struct nfsctl_arg *karg;
2145 union nfsctl_res *kres;
2146 mm_segment_t oldfs;
2147 int err;
2148
2149 karg = kmalloc(sizeof(*karg), GFP_USER);
2150 kres = kmalloc(sizeof(*kres), GFP_USER);
2151 if(!karg || !kres) {
2152 err = -ENOMEM;
2153 goto done;
2154 }
2155
2156 switch(cmd) {
2157 case NFSCTL_SVC:
2158 err = compat_nfs_svc_trans(karg, arg);
2159 break;
2160
2161 case NFSCTL_ADDCLIENT:
2162 err = compat_nfs_clnt_trans(karg, arg);
2163 break;
2164
2165 case NFSCTL_DELCLIENT:
2166 err = compat_nfs_clnt_trans(karg, arg);
2167 break;
2168
2169 case NFSCTL_EXPORT:
2170 case NFSCTL_UNEXPORT:
2171 err = compat_nfs_exp_trans(karg, arg);
2172 break;
2173
2174 case NFSCTL_GETFD:
2175 err = compat_nfs_getfd_trans(karg, arg);
2176 break;
2177
2178 case NFSCTL_GETFS:
2179 err = compat_nfs_getfs_trans(karg, arg);
2180 break;
2181
2182 default:
2183 err = -EINVAL;
2184 break;
2185 }
2186
2187 if (err)
2188 goto done;
2189
2190 oldfs = get_fs();
2191 set_fs(KERNEL_DS);
2192 /* The __user pointer casts are valid because of the set_fs() */
2193 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2194 set_fs(oldfs);
2195
2196 if (err)
2197 goto done;
2198
2199 if((cmd == NFSCTL_GETFD) ||
2200 (cmd == NFSCTL_GETFS))
2201 err = compat_nfs_getfh_res_trans(kres, res);
2202
2203 done:
2204 kfree(karg);
2205 kfree(kres);
2206 return err;
2207 }
2208 #else /* !NFSD */
2209 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2210 {
2211 return sys_ni_syscall();
2212 }
2213 #endif
2214
2215 #ifdef CONFIG_EPOLL
2216
2217 #ifdef HAVE_SET_RESTORE_SIGMASK
2218 asmlinkage long compat_sys_epoll_pwait(int epfd,
2219 struct compat_epoll_event __user *events,
2220 int maxevents, int timeout,
2221 const compat_sigset_t __user *sigmask,
2222 compat_size_t sigsetsize)
2223 {
2224 long err;
2225 compat_sigset_t csigmask;
2226 sigset_t ksigmask, sigsaved;
2227
2228 /*
2229 * If the caller wants a certain signal mask to be set during the wait,
2230 * we apply it here.
2231 */
2232 if (sigmask) {
2233 if (sigsetsize != sizeof(compat_sigset_t))
2234 return -EINVAL;
2235 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2236 return -EFAULT;
2237 sigset_from_compat(&ksigmask, &csigmask);
2238 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2239 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2240 }
2241
2242 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2243
2244 /*
2245 * If we changed the signal mask, we need to restore the original one.
2246 * In case we've got a signal while waiting, we do not restore the
2247 * signal mask yet, and we allow do_signal() to deliver the signal on
2248 * the way back to userspace, before the signal mask is restored.
2249 */
2250 if (sigmask) {
2251 if (err == -EINTR) {
2252 memcpy(&current->saved_sigmask, &sigsaved,
2253 sizeof(sigsaved));
2254 set_restore_sigmask();
2255 } else
2256 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2257 }
2258
2259 return err;
2260 }
2261 #endif /* HAVE_SET_RESTORE_SIGMASK */
2262
2263 #endif /* CONFIG_EPOLL */
2264
2265 #ifdef CONFIG_SIGNALFD
2266
2267 asmlinkage long compat_sys_signalfd4(int ufd,
2268 const compat_sigset_t __user *sigmask,
2269 compat_size_t sigsetsize, int flags)
2270 {
2271 compat_sigset_t ss32;
2272 sigset_t tmp;
2273 sigset_t __user *ksigmask;
2274
2275 if (sigsetsize != sizeof(compat_sigset_t))
2276 return -EINVAL;
2277 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2278 return -EFAULT;
2279 sigset_from_compat(&tmp, &ss32);
2280 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2281 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2282 return -EFAULT;
2283
2284 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2285 }
2286
2287 asmlinkage long compat_sys_signalfd(int ufd,
2288 const compat_sigset_t __user *sigmask,
2289 compat_size_t sigsetsize)
2290 {
2291 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2292 }
2293 #endif /* CONFIG_SIGNALFD */
2294
2295 #ifdef CONFIG_TIMERFD
2296
2297 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2298 const struct compat_itimerspec __user *utmr,
2299 struct compat_itimerspec __user *otmr)
2300 {
2301 int error;
2302 struct itimerspec t;
2303 struct itimerspec __user *ut;
2304
2305 if (get_compat_itimerspec(&t, utmr))
2306 return -EFAULT;
2307 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2308 if (copy_to_user(&ut[0], &t, sizeof(t)))
2309 return -EFAULT;
2310 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2311 if (!error && otmr)
2312 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2313 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2314
2315 return error;
2316 }
2317
2318 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2319 struct compat_itimerspec __user *otmr)
2320 {
2321 int error;
2322 struct itimerspec t;
2323 struct itimerspec __user *ut;
2324
2325 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2326 error = sys_timerfd_gettime(ufd, ut);
2327 if (!error)
2328 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2329 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2330
2331 return error;
2332 }
2333
2334 #endif /* CONFIG_TIMERFD */
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