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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[linux-btrfs-devel.git] / fs / compat.c
blob58b1da4598933ca9990494121234be6dcdc35bc0
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@ucw.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/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/errno.h>
23 #include <linux/time.h>
24 #include <linux/fs.h>
25 #include <linux/fcntl.h>
26 #include <linux/namei.h>
27 #include <linux/file.h>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/syscalls.h>
35 #include <linux/ctype.h>
36 #include <linux/module.h>
37 #include <linux/dirent.h>
38 #include <linux/fsnotify.h>
39 #include <linux/highuid.h>
40 #include <linux/nfsd/syscall.h>
41 #include <linux/personality.h>
42 #include <linux/rwsem.h>
43 #include <linux/tsacct_kern.h>
44 #include <linux/security.h>
45 #include <linux/highmem.h>
46 #include <linux/signal.h>
47 #include <linux/poll.h>
48 #include <linux/mm.h>
49 #include <linux/eventpoll.h>
50 #include <linux/fs_struct.h>
51 #include <linux/slab.h>
52 #include <linux/pagemap.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(const char __user *filename,
80 struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
104 return 0;
105 }
106 return do_utimes(dfd, filename, t ? tv : NULL, flags);
107 }
108
109 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
110 {
111 struct timespec tv[2];
112
113 if (t) {
114 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
115 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
116 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
117 get_user(tv[1].tv_nsec, &t[1].tv_usec))
118 return -EFAULT;
119 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
120 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
121 return -EINVAL;
122 tv[0].tv_nsec *= 1000;
123 tv[1].tv_nsec *= 1000;
124 }
125 return do_utimes(dfd, filename, t ? tv : NULL, 0);
126 }
127
128 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
129 {
130 return compat_sys_futimesat(AT_FDCWD, filename, t);
131 }
132
133 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
134 {
135 compat_ino_t ino = stat->ino;
136 typeof(ubuf->st_uid) uid = 0;
137 typeof(ubuf->st_gid) gid = 0;
138 int err;
139
140 SET_UID(uid, stat->uid);
141 SET_GID(gid, stat->gid);
142
143 if ((u64) stat->size > MAX_NON_LFS ||
144 !old_valid_dev(stat->dev) ||
145 !old_valid_dev(stat->rdev))
146 return -EOVERFLOW;
147 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
148 return -EOVERFLOW;
149
150 if (clear_user(ubuf, sizeof(*ubuf)))
151 return -EFAULT;
152
153 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
154 err |= __put_user(ino, &ubuf->st_ino);
155 err |= __put_user(stat->mode, &ubuf->st_mode);
156 err |= __put_user(stat->nlink, &ubuf->st_nlink);
157 err |= __put_user(uid, &ubuf->st_uid);
158 err |= __put_user(gid, &ubuf->st_gid);
159 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
160 err |= __put_user(stat->size, &ubuf->st_size);
161 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
162 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
163 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
164 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
165 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
166 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
167 err |= __put_user(stat->blksize, &ubuf->st_blksize);
168 err |= __put_user(stat->blocks, &ubuf->st_blocks);
169 return err;
170 }
171
172 asmlinkage long compat_sys_newstat(const char __user * filename,
173 struct compat_stat __user *statbuf)
174 {
175 struct kstat stat;
176 int error;
177
178 error = vfs_stat(filename, &stat);
179 if (error)
180 return error;
181 return cp_compat_stat(&stat, statbuf);
182 }
183
184 asmlinkage long compat_sys_newlstat(const char __user * filename,
185 struct compat_stat __user *statbuf)
186 {
187 struct kstat stat;
188 int error;
189
190 error = vfs_lstat(filename, &stat);
191 if (error)
192 return error;
193 return cp_compat_stat(&stat, statbuf);
194 }
195
196 #ifndef __ARCH_WANT_STAT64
197 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
198 const char __user *filename,
199 struct compat_stat __user *statbuf, int flag)
200 {
201 struct kstat stat;
202 int error;
203
204 error = vfs_fstatat(dfd, filename, &stat, flag);
205 if (error)
206 return error;
207 return cp_compat_stat(&stat, statbuf);
208 }
209 #endif
210
211 asmlinkage long compat_sys_newfstat(unsigned int fd,
212 struct compat_stat __user * statbuf)
213 {
214 struct kstat stat;
215 int error = vfs_fstat(fd, &stat);
216
217 if (!error)
218 error = cp_compat_stat(&stat, statbuf);
219 return error;
220 }
221
222 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
223 {
224
225 if (sizeof ubuf->f_blocks == 4) {
226 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
227 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
228 return -EOVERFLOW;
229 /* f_files and f_ffree may be -1; it's okay
230 * to stuff that into 32 bits */
231 if (kbuf->f_files != 0xffffffffffffffffULL
232 && (kbuf->f_files & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 if (kbuf->f_ffree != 0xffffffffffffffffULL
235 && (kbuf->f_ffree & 0xffffffff00000000ULL))
236 return -EOVERFLOW;
237 }
238 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
239 __put_user(kbuf->f_type, &ubuf->f_type) ||
240 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
241 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
242 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
243 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
244 __put_user(kbuf->f_files, &ubuf->f_files) ||
245 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
246 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
247 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
248 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
249 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
250 __put_user(0, &ubuf->f_spare[0]) ||
251 __put_user(0, &ubuf->f_spare[1]) ||
252 __put_user(0, &ubuf->f_spare[2]) ||
253 __put_user(0, &ubuf->f_spare[3]) ||
254 __put_user(0, &ubuf->f_spare[4]))
255 return -EFAULT;
256 return 0;
257 }
258
259 /*
260 * The following statfs calls are copies of code from fs/statfs.c and
261 * should be checked against those from time to time
262 */
263 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
264 {
265 struct kstatfs tmp;
266 int error = user_statfs(pathname, &tmp);
267 if (!error)
268 error = put_compat_statfs(buf, &tmp);
269 return error;
270 }
271
272 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
273 {
274 struct kstatfs tmp;
275 int error = fd_statfs(fd, &tmp);
276 if (!error)
277 error = put_compat_statfs(buf, &tmp);
278 return error;
279 }
280
281 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
282 {
283 if (sizeof ubuf->f_blocks == 4) {
284 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
285 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
286 return -EOVERFLOW;
287 /* f_files and f_ffree may be -1; it's okay
288 * to stuff that into 32 bits */
289 if (kbuf->f_files != 0xffffffffffffffffULL
290 && (kbuf->f_files & 0xffffffff00000000ULL))
291 return -EOVERFLOW;
292 if (kbuf->f_ffree != 0xffffffffffffffffULL
293 && (kbuf->f_ffree & 0xffffffff00000000ULL))
294 return -EOVERFLOW;
295 }
296 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
297 __put_user(kbuf->f_type, &ubuf->f_type) ||
298 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
299 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
300 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
301 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
302 __put_user(kbuf->f_files, &ubuf->f_files) ||
303 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
304 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
305 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
306 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
307 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
308 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
309 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
310 return -EFAULT;
311 return 0;
312 }
313
314 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
315 {
316 struct kstatfs tmp;
317 int error;
318
319 if (sz != sizeof(*buf))
320 return -EINVAL;
321
322 error = user_statfs(pathname, &tmp);
323 if (!error)
324 error = put_compat_statfs64(buf, &tmp);
325 return error;
326 }
327
328 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
329 {
330 struct kstatfs tmp;
331 int error;
332
333 if (sz != sizeof(*buf))
334 return -EINVAL;
335
336 error = fd_statfs(fd, &tmp);
337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
339 return error;
340 }
341
342 /*
343 * This is a copy of sys_ustat, just dealing with a structure layout.
344 * Given how simple this syscall is that apporach is more maintainable
345 * than the various conversion hacks.
346 */
347 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
348 {
349 struct super_block *sb;
350 struct compat_ustat tmp;
351 struct kstatfs sbuf;
352 int err;
353
354 sb = user_get_super(new_decode_dev(dev));
355 if (!sb)
356 return -EINVAL;
357 err = statfs_by_dentry(sb->s_root, &sbuf);
358 drop_super(sb);
359 if (err)
360 return err;
361
362 memset(&tmp, 0, sizeof(struct compat_ustat));
363 tmp.f_tfree = sbuf.f_bfree;
364 tmp.f_tinode = sbuf.f_ffree;
365 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
366 return -EFAULT;
367 return 0;
368 }
369
370 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
371 {
372 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
373 __get_user(kfl->l_type, &ufl->l_type) ||
374 __get_user(kfl->l_whence, &ufl->l_whence) ||
375 __get_user(kfl->l_start, &ufl->l_start) ||
376 __get_user(kfl->l_len, &ufl->l_len) ||
377 __get_user(kfl->l_pid, &ufl->l_pid))
378 return -EFAULT;
379 return 0;
380 }
381
382 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
383 {
384 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
385 __put_user(kfl->l_type, &ufl->l_type) ||
386 __put_user(kfl->l_whence, &ufl->l_whence) ||
387 __put_user(kfl->l_start, &ufl->l_start) ||
388 __put_user(kfl->l_len, &ufl->l_len) ||
389 __put_user(kfl->l_pid, &ufl->l_pid))
390 return -EFAULT;
391 return 0;
392 }
393
394 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
395 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
396 {
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405 }
406 #endif
407
408 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
409 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
410 {
411 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
412 __put_user(kfl->l_type, &ufl->l_type) ||
413 __put_user(kfl->l_whence, &ufl->l_whence) ||
414 __put_user(kfl->l_start, &ufl->l_start) ||
415 __put_user(kfl->l_len, &ufl->l_len) ||
416 __put_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419 }
420 #endif
421
422 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
423 unsigned long arg)
424 {
425 mm_segment_t old_fs;
426 struct flock f;
427 long ret;
428
429 switch (cmd) {
430 case F_GETLK:
431 case F_SETLK:
432 case F_SETLKW:
433 ret = get_compat_flock(&f, compat_ptr(arg));
434 if (ret != 0)
435 break;
436 old_fs = get_fs();
437 set_fs(KERNEL_DS);
438 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
439 set_fs(old_fs);
440 if (cmd == F_GETLK && ret == 0) {
441 /* GETLK was successful and we need to return the data...
442 * but it needs to fit in the compat structure.
443 * l_start shouldn't be too big, unless the original
444 * start + end is greater than COMPAT_OFF_T_MAX, in which
445 * case the app was asking for trouble, so we return
446 * -EOVERFLOW in that case.
447 * l_len could be too big, in which case we just truncate it,
448 * and only allow the app to see that part of the conflicting
449 * lock that might make sense to it anyway
450 */
451
452 if (f.l_start > COMPAT_OFF_T_MAX)
453 ret = -EOVERFLOW;
454 if (f.l_len > COMPAT_OFF_T_MAX)
455 f.l_len = COMPAT_OFF_T_MAX;
456 if (ret == 0)
457 ret = put_compat_flock(&f, compat_ptr(arg));
458 }
459 break;
460
461 case F_GETLK64:
462 case F_SETLK64:
463 case F_SETLKW64:
464 ret = get_compat_flock64(&f, compat_ptr(arg));
465 if (ret != 0)
466 break;
467 old_fs = get_fs();
468 set_fs(KERNEL_DS);
469 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
470 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
471 (unsigned long)&f);
472 set_fs(old_fs);
473 if (cmd == F_GETLK64 && ret == 0) {
474 /* need to return lock information - see above for commentary */
475 if (f.l_start > COMPAT_LOFF_T_MAX)
476 ret = -EOVERFLOW;
477 if (f.l_len > COMPAT_LOFF_T_MAX)
478 f.l_len = COMPAT_LOFF_T_MAX;
479 if (ret == 0)
480 ret = put_compat_flock64(&f, compat_ptr(arg));
481 }
482 break;
483
484 default:
485 ret = sys_fcntl(fd, cmd, arg);
486 break;
487 }
488 return ret;
489 }
490
491 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
492 unsigned long arg)
493 {
494 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
495 return -EINVAL;
496 return compat_sys_fcntl64(fd, cmd, arg);
497 }
498
499 asmlinkage long
500 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
501 {
502 long ret;
503 aio_context_t ctx64;
504
505 mm_segment_t oldfs = get_fs();
506 if (unlikely(get_user(ctx64, ctx32p)))
507 return -EFAULT;
508
509 set_fs(KERNEL_DS);
510 /* The __user pointer cast is valid because of the set_fs() */
511 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
512 set_fs(oldfs);
513 /* truncating is ok because it's a user address */
514 if (!ret)
515 ret = put_user((u32) ctx64, ctx32p);
516 return ret;
517 }
518
519 asmlinkage long
520 compat_sys_io_getevents(aio_context_t ctx_id,
521 unsigned long min_nr,
522 unsigned long nr,
523 struct io_event __user *events,
524 struct compat_timespec __user *timeout)
525 {
526 long ret;
527 struct timespec t;
528 struct timespec __user *ut = NULL;
529
530 ret = -EFAULT;
531 if (unlikely(!access_ok(VERIFY_WRITE, events,
532 nr * sizeof(struct io_event))))
533 goto out;
534 if (timeout) {
535 if (get_compat_timespec(&t, timeout))
536 goto out;
537
538 ut = compat_alloc_user_space(sizeof(*ut));
539 if (copy_to_user(ut, &t, sizeof(t)) )
540 goto out;
541 }
542 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
543 out:
544 return ret;
545 }
546
547 /* A write operation does a read from user space and vice versa */
548 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
549
550 ssize_t compat_rw_copy_check_uvector(int type,
551 const struct compat_iovec __user *uvector, unsigned long nr_segs,
552 unsigned long fast_segs, struct iovec *fast_pointer,
553 struct iovec **ret_pointer)
554 {
555 compat_ssize_t tot_len;
556 struct iovec *iov = *ret_pointer = fast_pointer;
557 ssize_t ret = 0;
558 int seg;
559
560 /*
561 * SuS says "The readv() function *may* fail if the iovcnt argument
562 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
563 * traditionally returned zero for zero segments, so...
564 */
565 if (nr_segs == 0)
566 goto out;
567
568 ret = -EINVAL;
569 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
570 goto out;
571 if (nr_segs > fast_segs) {
572 ret = -ENOMEM;
573 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
574 if (iov == NULL)
575 goto out;
576 }
577 *ret_pointer = iov;
578
579 /*
580 * Single unix specification:
581 * We should -EINVAL if an element length is not >= 0 and fitting an
582 * ssize_t.
583 *
584 * In Linux, the total length is limited to MAX_RW_COUNT, there is
585 * no overflow possibility.
586 */
587 tot_len = 0;
588 ret = -EINVAL;
589 for (seg = 0; seg < nr_segs; seg++) {
590 compat_uptr_t buf;
591 compat_ssize_t len;
592
593 if (__get_user(len, &uvector->iov_len) ||
594 __get_user(buf, &uvector->iov_base)) {
595 ret = -EFAULT;
596 goto out;
597 }
598 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599 goto out;
600 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
601 ret = -EFAULT;
602 goto out;
603 }
604 if (len > MAX_RW_COUNT - tot_len)
605 len = MAX_RW_COUNT - tot_len;
606 tot_len += len;
607 iov->iov_base = compat_ptr(buf);
608 iov->iov_len = (compat_size_t) len;
609 uvector++;
610 iov++;
611 }
612 ret = tot_len;
613
614 out:
615 return ret;
616 }
617
618 static inline long
619 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
620 {
621 compat_uptr_t uptr;
622 int i;
623
624 for (i = 0; i < nr; ++i) {
625 if (get_user(uptr, ptr32 + i))
626 return -EFAULT;
627 if (put_user(compat_ptr(uptr), ptr64 + i))
628 return -EFAULT;
629 }
630 return 0;
631 }
632
633 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
634
635 asmlinkage long
636 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
637 {
638 struct iocb __user * __user *iocb64;
639 long ret;
640
641 if (unlikely(nr < 0))
642 return -EINVAL;
643
644 if (nr > MAX_AIO_SUBMITS)
645 nr = MAX_AIO_SUBMITS;
646
647 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
648 ret = copy_iocb(nr, iocb, iocb64);
649 if (!ret)
650 ret = do_io_submit(ctx_id, nr, iocb64, 1);
651 return ret;
652 }
653
654 struct compat_ncp_mount_data {
655 compat_int_t version;
656 compat_uint_t ncp_fd;
657 __compat_uid_t mounted_uid;
658 compat_pid_t wdog_pid;
659 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
660 compat_uint_t time_out;
661 compat_uint_t retry_count;
662 compat_uint_t flags;
663 __compat_uid_t uid;
664 __compat_gid_t gid;
665 compat_mode_t file_mode;
666 compat_mode_t dir_mode;
667 };
668
669 struct compat_ncp_mount_data_v4 {
670 compat_int_t version;
671 compat_ulong_t flags;
672 compat_ulong_t mounted_uid;
673 compat_long_t wdog_pid;
674 compat_uint_t ncp_fd;
675 compat_uint_t time_out;
676 compat_uint_t retry_count;
677 compat_ulong_t uid;
678 compat_ulong_t gid;
679 compat_ulong_t file_mode;
680 compat_ulong_t dir_mode;
681 };
682
683 static void *do_ncp_super_data_conv(void *raw_data)
684 {
685 int version = *(unsigned int *)raw_data;
686
687 if (version == 3) {
688 struct compat_ncp_mount_data *c_n = raw_data;
689 struct ncp_mount_data *n = raw_data;
690
691 n->dir_mode = c_n->dir_mode;
692 n->file_mode = c_n->file_mode;
693 n->gid = c_n->gid;
694 n->uid = c_n->uid;
695 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
696 n->wdog_pid = c_n->wdog_pid;
697 n->mounted_uid = c_n->mounted_uid;
698 } else if (version == 4) {
699 struct compat_ncp_mount_data_v4 *c_n = raw_data;
700 struct ncp_mount_data_v4 *n = raw_data;
701
702 n->dir_mode = c_n->dir_mode;
703 n->file_mode = c_n->file_mode;
704 n->gid = c_n->gid;
705 n->uid = c_n->uid;
706 n->retry_count = c_n->retry_count;
707 n->time_out = c_n->time_out;
708 n->ncp_fd = c_n->ncp_fd;
709 n->wdog_pid = c_n->wdog_pid;
710 n->mounted_uid = c_n->mounted_uid;
711 n->flags = c_n->flags;
712 } else if (version != 5) {
713 return NULL;
714 }
715
716 return raw_data;
717 }
718
719
720 struct compat_nfs_string {
721 compat_uint_t len;
722 compat_uptr_t data;
723 };
724
725 static inline void compat_nfs_string(struct nfs_string *dst,
726 struct compat_nfs_string *src)
727 {
728 dst->data = compat_ptr(src->data);
729 dst->len = src->len;
730 }
731
732 struct compat_nfs4_mount_data_v1 {
733 compat_int_t version;
734 compat_int_t flags;
735 compat_int_t rsize;
736 compat_int_t wsize;
737 compat_int_t timeo;
738 compat_int_t retrans;
739 compat_int_t acregmin;
740 compat_int_t acregmax;
741 compat_int_t acdirmin;
742 compat_int_t acdirmax;
743 struct compat_nfs_string client_addr;
744 struct compat_nfs_string mnt_path;
745 struct compat_nfs_string hostname;
746 compat_uint_t host_addrlen;
747 compat_uptr_t host_addr;
748 compat_int_t proto;
749 compat_int_t auth_flavourlen;
750 compat_uptr_t auth_flavours;
751 };
752
753 static int do_nfs4_super_data_conv(void *raw_data)
754 {
755 int version = *(compat_uint_t *) raw_data;
756
757 if (version == 1) {
758 struct compat_nfs4_mount_data_v1 *raw = raw_data;
759 struct nfs4_mount_data *real = raw_data;
760
761 /* copy the fields backwards */
762 real->auth_flavours = compat_ptr(raw->auth_flavours);
763 real->auth_flavourlen = raw->auth_flavourlen;
764 real->proto = raw->proto;
765 real->host_addr = compat_ptr(raw->host_addr);
766 real->host_addrlen = raw->host_addrlen;
767 compat_nfs_string(&real->hostname, &raw->hostname);
768 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
769 compat_nfs_string(&real->client_addr, &raw->client_addr);
770 real->acdirmax = raw->acdirmax;
771 real->acdirmin = raw->acdirmin;
772 real->acregmax = raw->acregmax;
773 real->acregmin = raw->acregmin;
774 real->retrans = raw->retrans;
775 real->timeo = raw->timeo;
776 real->wsize = raw->wsize;
777 real->rsize = raw->rsize;
778 real->flags = raw->flags;
779 real->version = raw->version;
780 }
781
782 return 0;
783 }
784
785 #define NCPFS_NAME "ncpfs"
786 #define NFS4_NAME "nfs4"
787
788 asmlinkage long compat_sys_mount(const char __user * dev_name,
789 const char __user * dir_name,
790 const char __user * type, unsigned long flags,
791 const void __user * data)
792 {
793 char *kernel_type;
794 unsigned long data_page;
795 char *kernel_dev;
796 char *dir_page;
797 int retval;
798
799 retval = copy_mount_string(type, &kernel_type);
800 if (retval < 0)
801 goto out;
802
803 dir_page = getname(dir_name);
804 retval = PTR_ERR(dir_page);
805 if (IS_ERR(dir_page))
806 goto out1;
807
808 retval = copy_mount_string(dev_name, &kernel_dev);
809 if (retval < 0)
810 goto out2;
811
812 retval = copy_mount_options(data, &data_page);
813 if (retval < 0)
814 goto out3;
815
816 retval = -EINVAL;
817
818 if (kernel_type && data_page) {
819 if (!strcmp(kernel_type, NCPFS_NAME)) {
820 do_ncp_super_data_conv((void *)data_page);
821 } else if (!strcmp(kernel_type, NFS4_NAME)) {
822 if (do_nfs4_super_data_conv((void *) data_page))
823 goto out4;
824 }
825 }
826
827 retval = do_mount(kernel_dev, dir_page, kernel_type,
828 flags, (void*)data_page);
829
830 out4:
831 free_page(data_page);
832 out3:
833 kfree(kernel_dev);
834 out2:
835 putname(dir_page);
836 out1:
837 kfree(kernel_type);
838 out:
839 return retval;
840 }
841
842 struct compat_old_linux_dirent {
843 compat_ulong_t d_ino;
844 compat_ulong_t d_offset;
845 unsigned short d_namlen;
846 char d_name[1];
847 };
848
849 struct compat_readdir_callback {
850 struct compat_old_linux_dirent __user *dirent;
851 int result;
852 };
853
854 static int compat_fillonedir(void *__buf, const char *name, int namlen,
855 loff_t offset, u64 ino, unsigned int d_type)
856 {
857 struct compat_readdir_callback *buf = __buf;
858 struct compat_old_linux_dirent __user *dirent;
859 compat_ulong_t d_ino;
860
861 if (buf->result)
862 return -EINVAL;
863 d_ino = ino;
864 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
865 buf->result = -EOVERFLOW;
866 return -EOVERFLOW;
867 }
868 buf->result++;
869 dirent = buf->dirent;
870 if (!access_ok(VERIFY_WRITE, dirent,
871 (unsigned long)(dirent->d_name + namlen + 1) -
872 (unsigned long)dirent))
873 goto efault;
874 if ( __put_user(d_ino, &dirent->d_ino) ||
875 __put_user(offset, &dirent->d_offset) ||
876 __put_user(namlen, &dirent->d_namlen) ||
877 __copy_to_user(dirent->d_name, name, namlen) ||
878 __put_user(0, dirent->d_name + namlen))
879 goto efault;
880 return 0;
881 efault:
882 buf->result = -EFAULT;
883 return -EFAULT;
884 }
885
886 asmlinkage long compat_sys_old_readdir(unsigned int fd,
887 struct compat_old_linux_dirent __user *dirent, unsigned int count)
888 {
889 int error;
890 struct file *file;
891 struct compat_readdir_callback buf;
892
893 error = -EBADF;
894 file = fget(fd);
895 if (!file)
896 goto out;
897
898 buf.result = 0;
899 buf.dirent = dirent;
900
901 error = vfs_readdir(file, compat_fillonedir, &buf);
902 if (buf.result)
903 error = buf.result;
904
905 fput(file);
906 out:
907 return error;
908 }
909
910 struct compat_linux_dirent {
911 compat_ulong_t d_ino;
912 compat_ulong_t d_off;
913 unsigned short d_reclen;
914 char d_name[1];
915 };
916
917 struct compat_getdents_callback {
918 struct compat_linux_dirent __user *current_dir;
919 struct compat_linux_dirent __user *previous;
920 int count;
921 int error;
922 };
923
924 static int compat_filldir(void *__buf, const char *name, int namlen,
925 loff_t offset, u64 ino, unsigned int d_type)
926 {
927 struct compat_linux_dirent __user * dirent;
928 struct compat_getdents_callback *buf = __buf;
929 compat_ulong_t d_ino;
930 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
931 namlen + 2, sizeof(compat_long_t));
932
933 buf->error = -EINVAL; /* only used if we fail.. */
934 if (reclen > buf->count)
935 return -EINVAL;
936 d_ino = ino;
937 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
938 buf->error = -EOVERFLOW;
939 return -EOVERFLOW;
940 }
941 dirent = buf->previous;
942 if (dirent) {
943 if (__put_user(offset, &dirent->d_off))
944 goto efault;
945 }
946 dirent = buf->current_dir;
947 if (__put_user(d_ino, &dirent->d_ino))
948 goto efault;
949 if (__put_user(reclen, &dirent->d_reclen))
950 goto efault;
951 if (copy_to_user(dirent->d_name, name, namlen))
952 goto efault;
953 if (__put_user(0, dirent->d_name + namlen))
954 goto efault;
955 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
956 goto efault;
957 buf->previous = dirent;
958 dirent = (void __user *)dirent + reclen;
959 buf->current_dir = dirent;
960 buf->count -= reclen;
961 return 0;
962 efault:
963 buf->error = -EFAULT;
964 return -EFAULT;
965 }
966
967 asmlinkage long compat_sys_getdents(unsigned int fd,
968 struct compat_linux_dirent __user *dirent, unsigned int count)
969 {
970 struct file * file;
971 struct compat_linux_dirent __user * lastdirent;
972 struct compat_getdents_callback buf;
973 int error;
974
975 error = -EFAULT;
976 if (!access_ok(VERIFY_WRITE, dirent, count))
977 goto out;
978
979 error = -EBADF;
980 file = fget(fd);
981 if (!file)
982 goto out;
983
984 buf.current_dir = dirent;
985 buf.previous = NULL;
986 buf.count = count;
987 buf.error = 0;
988
989 error = vfs_readdir(file, compat_filldir, &buf);
990 if (error >= 0)
991 error = buf.error;
992 lastdirent = buf.previous;
993 if (lastdirent) {
994 if (put_user(file->f_pos, &lastdirent->d_off))
995 error = -EFAULT;
996 else
997 error = count - buf.count;
998 }
999 fput(file);
1000 out:
1001 return error;
1002 }
1003
1004 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1005
1006 struct compat_getdents_callback64 {
1007 struct linux_dirent64 __user *current_dir;
1008 struct linux_dirent64 __user *previous;
1009 int count;
1010 int error;
1011 };
1012
1013 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1014 u64 ino, unsigned int d_type)
1015 {
1016 struct linux_dirent64 __user *dirent;
1017 struct compat_getdents_callback64 *buf = __buf;
1018 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1019 sizeof(u64));
1020 u64 off;
1021
1022 buf->error = -EINVAL; /* only used if we fail.. */
1023 if (reclen > buf->count)
1024 return -EINVAL;
1025 dirent = buf->previous;
1026
1027 if (dirent) {
1028 if (__put_user_unaligned(offset, &dirent->d_off))
1029 goto efault;
1030 }
1031 dirent = buf->current_dir;
1032 if (__put_user_unaligned(ino, &dirent->d_ino))
1033 goto efault;
1034 off = 0;
1035 if (__put_user_unaligned(off, &dirent->d_off))
1036 goto efault;
1037 if (__put_user(reclen, &dirent->d_reclen))
1038 goto efault;
1039 if (__put_user(d_type, &dirent->d_type))
1040 goto efault;
1041 if (copy_to_user(dirent->d_name, name, namlen))
1042 goto efault;
1043 if (__put_user(0, dirent->d_name + namlen))
1044 goto efault;
1045 buf->previous = dirent;
1046 dirent = (void __user *)dirent + reclen;
1047 buf->current_dir = dirent;
1048 buf->count -= reclen;
1049 return 0;
1050 efault:
1051 buf->error = -EFAULT;
1052 return -EFAULT;
1053 }
1054
1055 asmlinkage long compat_sys_getdents64(unsigned int fd,
1056 struct linux_dirent64 __user * dirent, unsigned int count)
1057 {
1058 struct file * file;
1059 struct linux_dirent64 __user * lastdirent;
1060 struct compat_getdents_callback64 buf;
1061 int error;
1062
1063 error = -EFAULT;
1064 if (!access_ok(VERIFY_WRITE, dirent, count))
1065 goto out;
1066
1067 error = -EBADF;
1068 file = fget(fd);
1069 if (!file)
1070 goto out;
1071
1072 buf.current_dir = dirent;
1073 buf.previous = NULL;
1074 buf.count = count;
1075 buf.error = 0;
1076
1077 error = vfs_readdir(file, compat_filldir64, &buf);
1078 if (error >= 0)
1079 error = buf.error;
1080 lastdirent = buf.previous;
1081 if (lastdirent) {
1082 typeof(lastdirent->d_off) d_off = file->f_pos;
1083 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1084 error = -EFAULT;
1085 else
1086 error = count - buf.count;
1087 }
1088 fput(file);
1089 out:
1090 return error;
1091 }
1092 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1093
1094 static ssize_t compat_do_readv_writev(int type, struct file *file,
1095 const struct compat_iovec __user *uvector,
1096 unsigned long nr_segs, loff_t *pos)
1097 {
1098 compat_ssize_t tot_len;
1099 struct iovec iovstack[UIO_FASTIOV];
1100 struct iovec *iov = iovstack;
1101 ssize_t ret;
1102 io_fn_t fn;
1103 iov_fn_t fnv;
1104
1105 ret = -EINVAL;
1106 if (!file->f_op)
1107 goto out;
1108
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1114 UIO_FASTIOV, iovstack, &iov);
1115 if (tot_len == 0) {
1116 ret = 0;
1117 goto out;
1118 }
1119
1120 ret = rw_verify_area(type, file, pos, tot_len);
1121 if (ret < 0)
1122 goto out;
1123
1124 fnv = NULL;
1125 if (type == READ) {
1126 fn = file->f_op->read;
1127 fnv = file->f_op->aio_read;
1128 } else {
1129 fn = (io_fn_t)file->f_op->write;
1130 fnv = file->f_op->aio_write;
1131 }
1132
1133 if (fnv)
1134 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1135 pos, fnv);
1136 else
1137 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1138
1139 out:
1140 if (iov != iovstack)
1141 kfree(iov);
1142 if ((ret + (type == READ)) > 0) {
1143 if (type == READ)
1144 fsnotify_access(file);
1145 else
1146 fsnotify_modify(file);
1147 }
1148 return ret;
1149 }
1150
1151 static size_t compat_readv(struct file *file,
1152 const struct compat_iovec __user *vec,
1153 unsigned long vlen, loff_t *pos)
1154 {
1155 ssize_t ret = -EBADF;
1156
1157 if (!(file->f_mode & FMODE_READ))
1158 goto out;
1159
1160 ret = -EINVAL;
1161 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1162 goto out;
1163
1164 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1165
1166 out:
1167 if (ret > 0)
1168 add_rchar(current, ret);
1169 inc_syscr(current);
1170 return ret;
1171 }
1172
1173 asmlinkage ssize_t
1174 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1175 unsigned long vlen)
1176 {
1177 struct file *file;
1178 int fput_needed;
1179 ssize_t ret;
1180
1181 file = fget_light(fd, &fput_needed);
1182 if (!file)
1183 return -EBADF;
1184 ret = compat_readv(file, vec, vlen, &file->f_pos);
1185 fput_light(file, fput_needed);
1186 return ret;
1187 }
1188
1189 asmlinkage ssize_t
1190 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1191 unsigned long vlen, u32 pos_low, u32 pos_high)
1192 {
1193 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1194 struct file *file;
1195 int fput_needed;
1196 ssize_t ret;
1197
1198 if (pos < 0)
1199 return -EINVAL;
1200 file = fget_light(fd, &fput_needed);
1201 if (!file)
1202 return -EBADF;
1203 ret = -ESPIPE;
1204 if (file->f_mode & FMODE_PREAD)
1205 ret = compat_readv(file, vec, vlen, &pos);
1206 fput_light(file, fput_needed);
1207 return ret;
1208 }
1209
1210 static size_t compat_writev(struct file *file,
1211 const struct compat_iovec __user *vec,
1212 unsigned long vlen, loff_t *pos)
1213 {
1214 ssize_t ret = -EBADF;
1215
1216 if (!(file->f_mode & FMODE_WRITE))
1217 goto out;
1218
1219 ret = -EINVAL;
1220 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1221 goto out;
1222
1223 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1224
1225 out:
1226 if (ret > 0)
1227 add_wchar(current, ret);
1228 inc_syscw(current);
1229 return ret;
1230 }
1231
1232 asmlinkage ssize_t
1233 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1234 unsigned long vlen)
1235 {
1236 struct file *file;
1237 int fput_needed;
1238 ssize_t ret;
1239
1240 file = fget_light(fd, &fput_needed);
1241 if (!file)
1242 return -EBADF;
1243 ret = compat_writev(file, vec, vlen, &file->f_pos);
1244 fput_light(file, fput_needed);
1245 return ret;
1246 }
1247
1248 asmlinkage ssize_t
1249 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1250 unsigned long vlen, u32 pos_low, u32 pos_high)
1251 {
1252 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1253 struct file *file;
1254 int fput_needed;
1255 ssize_t ret;
1256
1257 if (pos < 0)
1258 return -EINVAL;
1259 file = fget_light(fd, &fput_needed);
1260 if (!file)
1261 return -EBADF;
1262 ret = -ESPIPE;
1263 if (file->f_mode & FMODE_PWRITE)
1264 ret = compat_writev(file, vec, vlen, &pos);
1265 fput_light(file, fput_needed);
1266 return ret;
1267 }
1268
1269 asmlinkage long
1270 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1271 unsigned int nr_segs, unsigned int flags)
1272 {
1273 unsigned i;
1274 struct iovec __user *iov;
1275 if (nr_segs > UIO_MAXIOV)
1276 return -EINVAL;
1277 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1278 for (i = 0; i < nr_segs; i++) {
1279 struct compat_iovec v;
1280 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1281 get_user(v.iov_len, &iov32[i].iov_len) ||
1282 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1283 put_user(v.iov_len, &iov[i].iov_len))
1284 return -EFAULT;
1285 }
1286 return sys_vmsplice(fd, iov, nr_segs, flags);
1287 }
1288
1289 /*
1290 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1291 * O_LARGEFILE flag.
1292 */
1293 asmlinkage long
1294 compat_sys_open(const char __user *filename, int flags, int mode)
1295 {
1296 return do_sys_open(AT_FDCWD, filename, flags, mode);
1297 }
1298
1299 /*
1300 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1301 * O_LARGEFILE flag.
1302 */
1303 asmlinkage long
1304 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1305 {
1306 return do_sys_open(dfd, filename, flags, mode);
1307 }
1308
1309 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1310
1311 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1312 int timeval, int ret)
1313 {
1314 struct timespec ts;
1315
1316 if (!p)
1317 return ret;
1318
1319 if (current->personality & STICKY_TIMEOUTS)
1320 goto sticky;
1321
1322 /* No update for zero timeout */
1323 if (!end_time->tv_sec && !end_time->tv_nsec)
1324 return ret;
1325
1326 ktime_get_ts(&ts);
1327 ts = timespec_sub(*end_time, ts);
1328 if (ts.tv_sec < 0)
1329 ts.tv_sec = ts.tv_nsec = 0;
1330
1331 if (timeval) {
1332 struct compat_timeval rtv;
1333
1334 rtv.tv_sec = ts.tv_sec;
1335 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1336
1337 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1338 return ret;
1339 } else {
1340 struct compat_timespec rts;
1341
1342 rts.tv_sec = ts.tv_sec;
1343 rts.tv_nsec = ts.tv_nsec;
1344
1345 if (!copy_to_user(p, &rts, sizeof(rts)))
1346 return ret;
1347 }
1348 /*
1349 * If an application puts its timeval in read-only memory, we
1350 * don't want the Linux-specific update to the timeval to
1351 * cause a fault after the select has completed
1352 * successfully. However, because we're not updating the
1353 * timeval, we can't restart the system call.
1354 */
1355
1356 sticky:
1357 if (ret == -ERESTARTNOHAND)
1358 ret = -EINTR;
1359 return ret;
1360 }
1361
1362 /*
1363 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1364 * 64-bit unsigned longs.
1365 */
1366 static
1367 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1368 unsigned long *fdset)
1369 {
1370 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1371 if (ufdset) {
1372 unsigned long odd;
1373
1374 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1375 return -EFAULT;
1376
1377 odd = nr & 1UL;
1378 nr &= ~1UL;
1379 while (nr) {
1380 unsigned long h, l;
1381 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1382 return -EFAULT;
1383 ufdset += 2;
1384 *fdset++ = h << 32 | l;
1385 nr -= 2;
1386 }
1387 if (odd && __get_user(*fdset, ufdset))
1388 return -EFAULT;
1389 } else {
1390 /* Tricky, must clear full unsigned long in the
1391 * kernel fdset at the end, this makes sure that
1392 * actually happens.
1393 */
1394 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1395 }
1396 return 0;
1397 }
1398
1399 static
1400 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1401 unsigned long *fdset)
1402 {
1403 unsigned long odd;
1404 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1405
1406 if (!ufdset)
1407 return 0;
1408
1409 odd = nr & 1UL;
1410 nr &= ~1UL;
1411 while (nr) {
1412 unsigned long h, l;
1413 l = *fdset++;
1414 h = l >> 32;
1415 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1416 return -EFAULT;
1417 ufdset += 2;
1418 nr -= 2;
1419 }
1420 if (odd && __put_user(*fdset, ufdset))
1421 return -EFAULT;
1422 return 0;
1423 }
1424
1425
1426 /*
1427 * This is a virtual copy of sys_select from fs/select.c and probably
1428 * should be compared to it from time to time
1429 */
1430
1431 /*
1432 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1433 * like to be certain this leads to no problems. So I return
1434 * EINTR just for safety.
1435 *
1436 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1437 * I'm trying ERESTARTNOHAND which restart only when you want to.
1438 */
1439 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1440 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1441 struct timespec *end_time)
1442 {
1443 fd_set_bits fds;
1444 void *bits;
1445 int size, max_fds, ret = -EINVAL;
1446 struct fdtable *fdt;
1447 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1448
1449 if (n < 0)
1450 goto out_nofds;
1451
1452 /* max_fds can increase, so grab it once to avoid race */
1453 rcu_read_lock();
1454 fdt = files_fdtable(current->files);
1455 max_fds = fdt->max_fds;
1456 rcu_read_unlock();
1457 if (n > max_fds)
1458 n = max_fds;
1459
1460 /*
1461 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1462 * since we used fdset we need to allocate memory in units of
1463 * long-words.
1464 */
1465 size = FDS_BYTES(n);
1466 bits = stack_fds;
1467 if (size > sizeof(stack_fds) / 6) {
1468 bits = kmalloc(6 * size, GFP_KERNEL);
1469 ret = -ENOMEM;
1470 if (!bits)
1471 goto out_nofds;
1472 }
1473 fds.in = (unsigned long *) bits;
1474 fds.out = (unsigned long *) (bits + size);
1475 fds.ex = (unsigned long *) (bits + 2*size);
1476 fds.res_in = (unsigned long *) (bits + 3*size);
1477 fds.res_out = (unsigned long *) (bits + 4*size);
1478 fds.res_ex = (unsigned long *) (bits + 5*size);
1479
1480 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1481 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1482 (ret = compat_get_fd_set(n, exp, fds.ex)))
1483 goto out;
1484 zero_fd_set(n, fds.res_in);
1485 zero_fd_set(n, fds.res_out);
1486 zero_fd_set(n, fds.res_ex);
1487
1488 ret = do_select(n, &fds, end_time);
1489
1490 if (ret < 0)
1491 goto out;
1492 if (!ret) {
1493 ret = -ERESTARTNOHAND;
1494 if (signal_pending(current))
1495 goto out;
1496 ret = 0;
1497 }
1498
1499 if (compat_set_fd_set(n, inp, fds.res_in) ||
1500 compat_set_fd_set(n, outp, fds.res_out) ||
1501 compat_set_fd_set(n, exp, fds.res_ex))
1502 ret = -EFAULT;
1503 out:
1504 if (bits != stack_fds)
1505 kfree(bits);
1506 out_nofds:
1507 return ret;
1508 }
1509
1510 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1511 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1512 struct compat_timeval __user *tvp)
1513 {
1514 struct timespec end_time, *to = NULL;
1515 struct compat_timeval tv;
1516 int ret;
1517
1518 if (tvp) {
1519 if (copy_from_user(&tv, tvp, sizeof(tv)))
1520 return -EFAULT;
1521
1522 to = &end_time;
1523 if (poll_select_set_timeout(to,
1524 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1525 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1526 return -EINVAL;
1527 }
1528
1529 ret = compat_core_sys_select(n, inp, outp, exp, to);
1530 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1531
1532 return ret;
1533 }
1534
1535 struct compat_sel_arg_struct {
1536 compat_ulong_t n;
1537 compat_uptr_t inp;
1538 compat_uptr_t outp;
1539 compat_uptr_t exp;
1540 compat_uptr_t tvp;
1541 };
1542
1543 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1544 {
1545 struct compat_sel_arg_struct a;
1546
1547 if (copy_from_user(&a, arg, sizeof(a)))
1548 return -EFAULT;
1549 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1550 compat_ptr(a.exp), compat_ptr(a.tvp));
1551 }
1552
1553 #ifdef HAVE_SET_RESTORE_SIGMASK
1554 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1555 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1556 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1557 compat_size_t sigsetsize)
1558 {
1559 compat_sigset_t ss32;
1560 sigset_t ksigmask, sigsaved;
1561 struct compat_timespec ts;
1562 struct timespec end_time, *to = NULL;
1563 int ret;
1564
1565 if (tsp) {
1566 if (copy_from_user(&ts, tsp, sizeof(ts)))
1567 return -EFAULT;
1568
1569 to = &end_time;
1570 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1571 return -EINVAL;
1572 }
1573
1574 if (sigmask) {
1575 if (sigsetsize != sizeof(compat_sigset_t))
1576 return -EINVAL;
1577 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1578 return -EFAULT;
1579 sigset_from_compat(&ksigmask, &ss32);
1580
1581 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1582 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1583 }
1584
1585 ret = compat_core_sys_select(n, inp, outp, exp, to);
1586 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1587
1588 if (ret == -ERESTARTNOHAND) {
1589 /*
1590 * Don't restore the signal mask yet. Let do_signal() deliver
1591 * the signal on the way back to userspace, before the signal
1592 * mask is restored.
1593 */
1594 if (sigmask) {
1595 memcpy(&current->saved_sigmask, &sigsaved,
1596 sizeof(sigsaved));
1597 set_restore_sigmask();
1598 }
1599 } else if (sigmask)
1600 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1601
1602 return ret;
1603 }
1604
1605 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1606 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1607 struct compat_timespec __user *tsp, void __user *sig)
1608 {
1609 compat_size_t sigsetsize = 0;
1610 compat_uptr_t up = 0;
1611
1612 if (sig) {
1613 if (!access_ok(VERIFY_READ, sig,
1614 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1615 __get_user(up, (compat_uptr_t __user *)sig) ||
1616 __get_user(sigsetsize,
1617 (compat_size_t __user *)(sig+sizeof(up))))
1618 return -EFAULT;
1619 }
1620 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1621 sigsetsize);
1622 }
1623
1624 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1625 unsigned int nfds, struct compat_timespec __user *tsp,
1626 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1627 {
1628 compat_sigset_t ss32;
1629 sigset_t ksigmask, sigsaved;
1630 struct compat_timespec ts;
1631 struct timespec end_time, *to = NULL;
1632 int ret;
1633
1634 if (tsp) {
1635 if (copy_from_user(&ts, tsp, sizeof(ts)))
1636 return -EFAULT;
1637
1638 to = &end_time;
1639 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1640 return -EINVAL;
1641 }
1642
1643 if (sigmask) {
1644 if (sigsetsize != sizeof(compat_sigset_t))
1645 return -EINVAL;
1646 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1647 return -EFAULT;
1648 sigset_from_compat(&ksigmask, &ss32);
1649
1650 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1651 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1652 }
1653
1654 ret = do_sys_poll(ufds, nfds, to);
1655
1656 /* We can restart this syscall, usually */
1657 if (ret == -EINTR) {
1658 /*
1659 * Don't restore the signal mask yet. Let do_signal() deliver
1660 * the signal on the way back to userspace, before the signal
1661 * mask is restored.
1662 */
1663 if (sigmask) {
1664 memcpy(&current->saved_sigmask, &sigsaved,
1665 sizeof(sigsaved));
1666 set_restore_sigmask();
1667 }
1668 ret = -ERESTARTNOHAND;
1669 } else if (sigmask)
1670 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1671
1672 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1673
1674 return ret;
1675 }
1676 #endif /* HAVE_SET_RESTORE_SIGMASK */
1677
1678 #ifdef CONFIG_EPOLL
1679
1680 #ifdef HAVE_SET_RESTORE_SIGMASK
1681 asmlinkage long compat_sys_epoll_pwait(int epfd,
1682 struct compat_epoll_event __user *events,
1683 int maxevents, int timeout,
1684 const compat_sigset_t __user *sigmask,
1685 compat_size_t sigsetsize)
1686 {
1687 long err;
1688 compat_sigset_t csigmask;
1689 sigset_t ksigmask, sigsaved;
1690
1691 /*
1692 * If the caller wants a certain signal mask to be set during the wait,
1693 * we apply it here.
1694 */
1695 if (sigmask) {
1696 if (sigsetsize != sizeof(compat_sigset_t))
1697 return -EINVAL;
1698 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1699 return -EFAULT;
1700 sigset_from_compat(&ksigmask, &csigmask);
1701 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1702 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1703 }
1704
1705 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1706
1707 /*
1708 * If we changed the signal mask, we need to restore the original one.
1709 * In case we've got a signal while waiting, we do not restore the
1710 * signal mask yet, and we allow do_signal() to deliver the signal on
1711 * the way back to userspace, before the signal mask is restored.
1712 */
1713 if (sigmask) {
1714 if (err == -EINTR) {
1715 memcpy(&current->saved_sigmask, &sigsaved,
1716 sizeof(sigsaved));
1717 set_restore_sigmask();
1718 } else
1719 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1720 }
1721
1722 return err;
1723 }
1724 #endif /* HAVE_SET_RESTORE_SIGMASK */
1725
1726 #endif /* CONFIG_EPOLL */
1727
1728 #ifdef CONFIG_SIGNALFD
1729
1730 asmlinkage long compat_sys_signalfd4(int ufd,
1731 const compat_sigset_t __user *sigmask,
1732 compat_size_t sigsetsize, int flags)
1733 {
1734 compat_sigset_t ss32;
1735 sigset_t tmp;
1736 sigset_t __user *ksigmask;
1737
1738 if (sigsetsize != sizeof(compat_sigset_t))
1739 return -EINVAL;
1740 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1741 return -EFAULT;
1742 sigset_from_compat(&tmp, &ss32);
1743 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1744 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1745 return -EFAULT;
1746
1747 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1748 }
1749
1750 asmlinkage long compat_sys_signalfd(int ufd,
1751 const compat_sigset_t __user *sigmask,
1752 compat_size_t sigsetsize)
1753 {
1754 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1755 }
1756 #endif /* CONFIG_SIGNALFD */
1757
1758 #ifdef CONFIG_TIMERFD
1759
1760 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1761 const struct compat_itimerspec __user *utmr,
1762 struct compat_itimerspec __user *otmr)
1763 {
1764 int error;
1765 struct itimerspec t;
1766 struct itimerspec __user *ut;
1767
1768 if (get_compat_itimerspec(&t, utmr))
1769 return -EFAULT;
1770 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1771 if (copy_to_user(&ut[0], &t, sizeof(t)))
1772 return -EFAULT;
1773 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1774 if (!error && otmr)
1775 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1776 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1777
1778 return error;
1779 }
1780
1781 asmlinkage long compat_sys_timerfd_gettime(int ufd,
1782 struct compat_itimerspec __user *otmr)
1783 {
1784 int error;
1785 struct itimerspec t;
1786 struct itimerspec __user *ut;
1787
1788 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1789 error = sys_timerfd_gettime(ufd, ut);
1790 if (!error)
1791 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1792 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1793
1794 return error;
1795 }
1796
1797 #endif /* CONFIG_TIMERFD */
1798
1799 #ifdef CONFIG_FHANDLE
1800 /*
1801 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1802 * doesn't set the O_LARGEFILE flag.
1803 */
1804 asmlinkage long
1805 compat_sys_open_by_handle_at(int mountdirfd,
1806 struct file_handle __user *handle, int flags)
1807 {
1808 return do_handle_open(mountdirfd, handle, flags);
1809 }
1810 #endif
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