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When sending start offset to readdir, get . and .. into account
[pohmelfs.git] / fs / compat.c
blob07880bae28a9fa2128eb5df60c6193c39e099fb8
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/personality.h>
41 #include <linux/rwsem.h>
42 #include <linux/tsacct_kern.h>
43 #include <linux/security.h>
44 #include <linux/highmem.h>
45 #include <linux/signal.h>
46 #include <linux/poll.h>
47 #include <linux/mm.h>
48 #include <linux/eventpoll.h>
49 #include <linux/fs_struct.h>
50 #include <linux/slab.h>
51 #include <linux/pagemap.h>
52
53 #include <asm/uaccess.h>
54 #include <asm/mmu_context.h>
55 #include <asm/ioctls.h>
56 #include "internal.h"
57
58 int compat_log = 1;
59
60 int compat_printk(const char *fmt, ...)
61 {
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70 }
71
72 #include "read_write.h"
73
74 /*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78 asmlinkage long compat_sys_utime(const char __user *filename,
79 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, const 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, const 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(const 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 struct compat_stat tmp;
135
136 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
137 return -EOVERFLOW;
138
139 memset(&tmp, 0, sizeof(tmp));
140 tmp.st_dev = old_encode_dev(stat->dev);
141 tmp.st_ino = stat->ino;
142 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
143 return -EOVERFLOW;
144 tmp.st_mode = stat->mode;
145 tmp.st_nlink = stat->nlink;
146 if (tmp.st_nlink != stat->nlink)
147 return -EOVERFLOW;
148 SET_UID(tmp.st_uid, stat->uid);
149 SET_GID(tmp.st_gid, stat->gid);
150 tmp.st_rdev = old_encode_dev(stat->rdev);
151 if ((u64) stat->size > MAX_NON_LFS)
152 return -EOVERFLOW;
153 tmp.st_size = stat->size;
154 tmp.st_atime = stat->atime.tv_sec;
155 tmp.st_atime_nsec = stat->atime.tv_nsec;
156 tmp.st_mtime = stat->mtime.tv_sec;
157 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
158 tmp.st_ctime = stat->ctime.tv_sec;
159 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
160 tmp.st_blocks = stat->blocks;
161 tmp.st_blksize = stat->blksize;
162 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
163 }
164
165 asmlinkage long compat_sys_newstat(const char __user * filename,
166 struct compat_stat __user *statbuf)
167 {
168 struct kstat stat;
169 int error;
170
171 error = vfs_stat(filename, &stat);
172 if (error)
173 return error;
174 return cp_compat_stat(&stat, statbuf);
175 }
176
177 asmlinkage long compat_sys_newlstat(const char __user * filename,
178 struct compat_stat __user *statbuf)
179 {
180 struct kstat stat;
181 int error;
182
183 error = vfs_lstat(filename, &stat);
184 if (error)
185 return error;
186 return cp_compat_stat(&stat, statbuf);
187 }
188
189 #ifndef __ARCH_WANT_STAT64
190 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
191 const char __user *filename,
192 struct compat_stat __user *statbuf, int flag)
193 {
194 struct kstat stat;
195 int error;
196
197 error = vfs_fstatat(dfd, filename, &stat, flag);
198 if (error)
199 return error;
200 return cp_compat_stat(&stat, statbuf);
201 }
202 #endif
203
204 asmlinkage long compat_sys_newfstat(unsigned int fd,
205 struct compat_stat __user * statbuf)
206 {
207 struct kstat stat;
208 int error = vfs_fstat(fd, &stat);
209
210 if (!error)
211 error = cp_compat_stat(&stat, statbuf);
212 return error;
213 }
214
215 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
216 {
217
218 if (sizeof ubuf->f_blocks == 4) {
219 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
220 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
221 return -EOVERFLOW;
222 /* f_files and f_ffree may be -1; it's okay
223 * to stuff that into 32 bits */
224 if (kbuf->f_files != 0xffffffffffffffffULL
225 && (kbuf->f_files & 0xffffffff00000000ULL))
226 return -EOVERFLOW;
227 if (kbuf->f_ffree != 0xffffffffffffffffULL
228 && (kbuf->f_ffree & 0xffffffff00000000ULL))
229 return -EOVERFLOW;
230 }
231 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
232 __put_user(kbuf->f_type, &ubuf->f_type) ||
233 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
234 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
235 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
236 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
237 __put_user(kbuf->f_files, &ubuf->f_files) ||
238 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
239 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
240 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
241 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
242 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
243 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
244 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
245 return -EFAULT;
246 return 0;
247 }
248
249 /*
250 * The following statfs calls are copies of code from fs/statfs.c and
251 * should be checked against those from time to time
252 */
253 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
254 {
255 struct kstatfs tmp;
256 int error = user_statfs(pathname, &tmp);
257 if (!error)
258 error = put_compat_statfs(buf, &tmp);
259 return error;
260 }
261
262 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
263 {
264 struct kstatfs tmp;
265 int error = fd_statfs(fd, &tmp);
266 if (!error)
267 error = put_compat_statfs(buf, &tmp);
268 return error;
269 }
270
271 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
272 {
273 if (sizeof ubuf->f_blocks == 4) {
274 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
275 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
276 return -EOVERFLOW;
277 /* f_files and f_ffree may be -1; it's okay
278 * to stuff that into 32 bits */
279 if (kbuf->f_files != 0xffffffffffffffffULL
280 && (kbuf->f_files & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 if (kbuf->f_ffree != 0xffffffffffffffffULL
283 && (kbuf->f_ffree & 0xffffffff00000000ULL))
284 return -EOVERFLOW;
285 }
286 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
287 __put_user(kbuf->f_type, &ubuf->f_type) ||
288 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
289 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
290 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
291 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
292 __put_user(kbuf->f_files, &ubuf->f_files) ||
293 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
294 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
295 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
296 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
297 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
298 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
299 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
300 return -EFAULT;
301 return 0;
302 }
303
304 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
305 {
306 struct kstatfs tmp;
307 int error;
308
309 if (sz != sizeof(*buf))
310 return -EINVAL;
311
312 error = user_statfs(pathname, &tmp);
313 if (!error)
314 error = put_compat_statfs64(buf, &tmp);
315 return error;
316 }
317
318 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
319 {
320 struct kstatfs tmp;
321 int error;
322
323 if (sz != sizeof(*buf))
324 return -EINVAL;
325
326 error = fd_statfs(fd, &tmp);
327 if (!error)
328 error = put_compat_statfs64(buf, &tmp);
329 return error;
330 }
331
332 /*
333 * This is a copy of sys_ustat, just dealing with a structure layout.
334 * Given how simple this syscall is that apporach is more maintainable
335 * than the various conversion hacks.
336 */
337 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
338 {
339 struct compat_ustat tmp;
340 struct kstatfs sbuf;
341 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
342 if (err)
343 return err;
344
345 memset(&tmp, 0, sizeof(struct compat_ustat));
346 tmp.f_tfree = sbuf.f_bfree;
347 tmp.f_tinode = sbuf.f_ffree;
348 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
349 return -EFAULT;
350 return 0;
351 }
352
353 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
354 {
355 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
356 __get_user(kfl->l_type, &ufl->l_type) ||
357 __get_user(kfl->l_whence, &ufl->l_whence) ||
358 __get_user(kfl->l_start, &ufl->l_start) ||
359 __get_user(kfl->l_len, &ufl->l_len) ||
360 __get_user(kfl->l_pid, &ufl->l_pid))
361 return -EFAULT;
362 return 0;
363 }
364
365 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
366 {
367 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
368 __put_user(kfl->l_type, &ufl->l_type) ||
369 __put_user(kfl->l_whence, &ufl->l_whence) ||
370 __put_user(kfl->l_start, &ufl->l_start) ||
371 __put_user(kfl->l_len, &ufl->l_len) ||
372 __put_user(kfl->l_pid, &ufl->l_pid))
373 return -EFAULT;
374 return 0;
375 }
376
377 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
378 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
379 {
380 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
381 __get_user(kfl->l_type, &ufl->l_type) ||
382 __get_user(kfl->l_whence, &ufl->l_whence) ||
383 __get_user(kfl->l_start, &ufl->l_start) ||
384 __get_user(kfl->l_len, &ufl->l_len) ||
385 __get_user(kfl->l_pid, &ufl->l_pid))
386 return -EFAULT;
387 return 0;
388 }
389 #endif
390
391 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
392 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
393 {
394 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
395 __put_user(kfl->l_type, &ufl->l_type) ||
396 __put_user(kfl->l_whence, &ufl->l_whence) ||
397 __put_user(kfl->l_start, &ufl->l_start) ||
398 __put_user(kfl->l_len, &ufl->l_len) ||
399 __put_user(kfl->l_pid, &ufl->l_pid))
400 return -EFAULT;
401 return 0;
402 }
403 #endif
404
405 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
406 unsigned long arg)
407 {
408 mm_segment_t old_fs;
409 struct flock f;
410 long ret;
411
412 switch (cmd) {
413 case F_GETLK:
414 case F_SETLK:
415 case F_SETLKW:
416 ret = get_compat_flock(&f, compat_ptr(arg));
417 if (ret != 0)
418 break;
419 old_fs = get_fs();
420 set_fs(KERNEL_DS);
421 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
422 set_fs(old_fs);
423 if (cmd == F_GETLK && ret == 0) {
424 /* GETLK was successful and we need to return the data...
425 * but it needs to fit in the compat structure.
426 * l_start shouldn't be too big, unless the original
427 * start + end is greater than COMPAT_OFF_T_MAX, in which
428 * case the app was asking for trouble, so we return
429 * -EOVERFLOW in that case.
430 * l_len could be too big, in which case we just truncate it,
431 * and only allow the app to see that part of the conflicting
432 * lock that might make sense to it anyway
433 */
434
435 if (f.l_start > COMPAT_OFF_T_MAX)
436 ret = -EOVERFLOW;
437 if (f.l_len > COMPAT_OFF_T_MAX)
438 f.l_len = COMPAT_OFF_T_MAX;
439 if (ret == 0)
440 ret = put_compat_flock(&f, compat_ptr(arg));
441 }
442 break;
443
444 case F_GETLK64:
445 case F_SETLK64:
446 case F_SETLKW64:
447 ret = get_compat_flock64(&f, compat_ptr(arg));
448 if (ret != 0)
449 break;
450 old_fs = get_fs();
451 set_fs(KERNEL_DS);
452 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
453 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
454 (unsigned long)&f);
455 set_fs(old_fs);
456 if (cmd == F_GETLK64 && ret == 0) {
457 /* need to return lock information - see above for commentary */
458 if (f.l_start > COMPAT_LOFF_T_MAX)
459 ret = -EOVERFLOW;
460 if (f.l_len > COMPAT_LOFF_T_MAX)
461 f.l_len = COMPAT_LOFF_T_MAX;
462 if (ret == 0)
463 ret = put_compat_flock64(&f, compat_ptr(arg));
464 }
465 break;
466
467 default:
468 ret = sys_fcntl(fd, cmd, arg);
469 break;
470 }
471 return ret;
472 }
473
474 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
475 unsigned long arg)
476 {
477 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
478 return -EINVAL;
479 return compat_sys_fcntl64(fd, cmd, arg);
480 }
481
482 asmlinkage long
483 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
484 {
485 long ret;
486 aio_context_t ctx64;
487
488 mm_segment_t oldfs = get_fs();
489 if (unlikely(get_user(ctx64, ctx32p)))
490 return -EFAULT;
491
492 set_fs(KERNEL_DS);
493 /* The __user pointer cast is valid because of the set_fs() */
494 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
495 set_fs(oldfs);
496 /* truncating is ok because it's a user address */
497 if (!ret)
498 ret = put_user((u32) ctx64, ctx32p);
499 return ret;
500 }
501
502 asmlinkage long
503 compat_sys_io_getevents(aio_context_t ctx_id,
504 unsigned long min_nr,
505 unsigned long nr,
506 struct io_event __user *events,
507 struct compat_timespec __user *timeout)
508 {
509 long ret;
510 struct timespec t;
511 struct timespec __user *ut = NULL;
512
513 ret = -EFAULT;
514 if (unlikely(!access_ok(VERIFY_WRITE, events,
515 nr * sizeof(struct io_event))))
516 goto out;
517 if (timeout) {
518 if (get_compat_timespec(&t, timeout))
519 goto out;
520
521 ut = compat_alloc_user_space(sizeof(*ut));
522 if (copy_to_user(ut, &t, sizeof(t)) )
523 goto out;
524 }
525 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
526 out:
527 return ret;
528 }
529
530 /* A write operation does a read from user space and vice versa */
531 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
532
533 ssize_t compat_rw_copy_check_uvector(int type,
534 const struct compat_iovec __user *uvector, unsigned long nr_segs,
535 unsigned long fast_segs, struct iovec *fast_pointer,
536 struct iovec **ret_pointer, int check_access)
537 {
538 compat_ssize_t tot_len;
539 struct iovec *iov = *ret_pointer = fast_pointer;
540 ssize_t ret = 0;
541 int seg;
542
543 /*
544 * SuS says "The readv() function *may* fail if the iovcnt argument
545 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
546 * traditionally returned zero for zero segments, so...
547 */
548 if (nr_segs == 0)
549 goto out;
550
551 ret = -EINVAL;
552 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
553 goto out;
554 if (nr_segs > fast_segs) {
555 ret = -ENOMEM;
556 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
557 if (iov == NULL)
558 goto out;
559 }
560 *ret_pointer = iov;
561
562 /*
563 * Single unix specification:
564 * We should -EINVAL if an element length is not >= 0 and fitting an
565 * ssize_t.
566 *
567 * In Linux, the total length is limited to MAX_RW_COUNT, there is
568 * no overflow possibility.
569 */
570 tot_len = 0;
571 ret = -EINVAL;
572 for (seg = 0; seg < nr_segs; seg++) {
573 compat_uptr_t buf;
574 compat_ssize_t len;
575
576 if (__get_user(len, &uvector->iov_len) ||
577 __get_user(buf, &uvector->iov_base)) {
578 ret = -EFAULT;
579 goto out;
580 }
581 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
582 goto out;
583 if (check_access &&
584 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
585 ret = -EFAULT;
586 goto out;
587 }
588 if (len > MAX_RW_COUNT - tot_len)
589 len = MAX_RW_COUNT - tot_len;
590 tot_len += len;
591 iov->iov_base = compat_ptr(buf);
592 iov->iov_len = (compat_size_t) len;
593 uvector++;
594 iov++;
595 }
596 ret = tot_len;
597
598 out:
599 return ret;
600 }
601
602 static inline long
603 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
604 {
605 compat_uptr_t uptr;
606 int i;
607
608 for (i = 0; i < nr; ++i) {
609 if (get_user(uptr, ptr32 + i))
610 return -EFAULT;
611 if (put_user(compat_ptr(uptr), ptr64 + i))
612 return -EFAULT;
613 }
614 return 0;
615 }
616
617 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
618
619 asmlinkage long
620 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
621 {
622 struct iocb __user * __user *iocb64;
623 long ret;
624
625 if (unlikely(nr < 0))
626 return -EINVAL;
627
628 if (nr > MAX_AIO_SUBMITS)
629 nr = MAX_AIO_SUBMITS;
630
631 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
632 ret = copy_iocb(nr, iocb, iocb64);
633 if (!ret)
634 ret = do_io_submit(ctx_id, nr, iocb64, 1);
635 return ret;
636 }
637
638 struct compat_ncp_mount_data {
639 compat_int_t version;
640 compat_uint_t ncp_fd;
641 __compat_uid_t mounted_uid;
642 compat_pid_t wdog_pid;
643 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
644 compat_uint_t time_out;
645 compat_uint_t retry_count;
646 compat_uint_t flags;
647 __compat_uid_t uid;
648 __compat_gid_t gid;
649 compat_mode_t file_mode;
650 compat_mode_t dir_mode;
651 };
652
653 struct compat_ncp_mount_data_v4 {
654 compat_int_t version;
655 compat_ulong_t flags;
656 compat_ulong_t mounted_uid;
657 compat_long_t wdog_pid;
658 compat_uint_t ncp_fd;
659 compat_uint_t time_out;
660 compat_uint_t retry_count;
661 compat_ulong_t uid;
662 compat_ulong_t gid;
663 compat_ulong_t file_mode;
664 compat_ulong_t dir_mode;
665 };
666
667 static void *do_ncp_super_data_conv(void *raw_data)
668 {
669 int version = *(unsigned int *)raw_data;
670
671 if (version == 3) {
672 struct compat_ncp_mount_data *c_n = raw_data;
673 struct ncp_mount_data *n = raw_data;
674
675 n->dir_mode = c_n->dir_mode;
676 n->file_mode = c_n->file_mode;
677 n->gid = c_n->gid;
678 n->uid = c_n->uid;
679 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
680 n->wdog_pid = c_n->wdog_pid;
681 n->mounted_uid = c_n->mounted_uid;
682 } else if (version == 4) {
683 struct compat_ncp_mount_data_v4 *c_n = raw_data;
684 struct ncp_mount_data_v4 *n = raw_data;
685
686 n->dir_mode = c_n->dir_mode;
687 n->file_mode = c_n->file_mode;
688 n->gid = c_n->gid;
689 n->uid = c_n->uid;
690 n->retry_count = c_n->retry_count;
691 n->time_out = c_n->time_out;
692 n->ncp_fd = c_n->ncp_fd;
693 n->wdog_pid = c_n->wdog_pid;
694 n->mounted_uid = c_n->mounted_uid;
695 n->flags = c_n->flags;
696 } else if (version != 5) {
697 return NULL;
698 }
699
700 return raw_data;
701 }
702
703
704 struct compat_nfs_string {
705 compat_uint_t len;
706 compat_uptr_t data;
707 };
708
709 static inline void compat_nfs_string(struct nfs_string *dst,
710 struct compat_nfs_string *src)
711 {
712 dst->data = compat_ptr(src->data);
713 dst->len = src->len;
714 }
715
716 struct compat_nfs4_mount_data_v1 {
717 compat_int_t version;
718 compat_int_t flags;
719 compat_int_t rsize;
720 compat_int_t wsize;
721 compat_int_t timeo;
722 compat_int_t retrans;
723 compat_int_t acregmin;
724 compat_int_t acregmax;
725 compat_int_t acdirmin;
726 compat_int_t acdirmax;
727 struct compat_nfs_string client_addr;
728 struct compat_nfs_string mnt_path;
729 struct compat_nfs_string hostname;
730 compat_uint_t host_addrlen;
731 compat_uptr_t host_addr;
732 compat_int_t proto;
733 compat_int_t auth_flavourlen;
734 compat_uptr_t auth_flavours;
735 };
736
737 static int do_nfs4_super_data_conv(void *raw_data)
738 {
739 int version = *(compat_uint_t *) raw_data;
740
741 if (version == 1) {
742 struct compat_nfs4_mount_data_v1 *raw = raw_data;
743 struct nfs4_mount_data *real = raw_data;
744
745 /* copy the fields backwards */
746 real->auth_flavours = compat_ptr(raw->auth_flavours);
747 real->auth_flavourlen = raw->auth_flavourlen;
748 real->proto = raw->proto;
749 real->host_addr = compat_ptr(raw->host_addr);
750 real->host_addrlen = raw->host_addrlen;
751 compat_nfs_string(&real->hostname, &raw->hostname);
752 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
753 compat_nfs_string(&real->client_addr, &raw->client_addr);
754 real->acdirmax = raw->acdirmax;
755 real->acdirmin = raw->acdirmin;
756 real->acregmax = raw->acregmax;
757 real->acregmin = raw->acregmin;
758 real->retrans = raw->retrans;
759 real->timeo = raw->timeo;
760 real->wsize = raw->wsize;
761 real->rsize = raw->rsize;
762 real->flags = raw->flags;
763 real->version = raw->version;
764 }
765
766 return 0;
767 }
768
769 #define NCPFS_NAME "ncpfs"
770 #define NFS4_NAME "nfs4"
771
772 asmlinkage long compat_sys_mount(const char __user * dev_name,
773 const char __user * dir_name,
774 const char __user * type, unsigned long flags,
775 const void __user * data)
776 {
777 char *kernel_type;
778 unsigned long data_page;
779 char *kernel_dev;
780 char *dir_page;
781 int retval;
782
783 retval = copy_mount_string(type, &kernel_type);
784 if (retval < 0)
785 goto out;
786
787 dir_page = getname(dir_name);
788 retval = PTR_ERR(dir_page);
789 if (IS_ERR(dir_page))
790 goto out1;
791
792 retval = copy_mount_string(dev_name, &kernel_dev);
793 if (retval < 0)
794 goto out2;
795
796 retval = copy_mount_options(data, &data_page);
797 if (retval < 0)
798 goto out3;
799
800 retval = -EINVAL;
801
802 if (kernel_type && data_page) {
803 if (!strcmp(kernel_type, NCPFS_NAME)) {
804 do_ncp_super_data_conv((void *)data_page);
805 } else if (!strcmp(kernel_type, NFS4_NAME)) {
806 if (do_nfs4_super_data_conv((void *) data_page))
807 goto out4;
808 }
809 }
810
811 retval = do_mount(kernel_dev, dir_page, kernel_type,
812 flags, (void*)data_page);
813
814 out4:
815 free_page(data_page);
816 out3:
817 kfree(kernel_dev);
818 out2:
819 putname(dir_page);
820 out1:
821 kfree(kernel_type);
822 out:
823 return retval;
824 }
825
826 struct compat_old_linux_dirent {
827 compat_ulong_t d_ino;
828 compat_ulong_t d_offset;
829 unsigned short d_namlen;
830 char d_name[1];
831 };
832
833 struct compat_readdir_callback {
834 struct compat_old_linux_dirent __user *dirent;
835 int result;
836 };
837
838 static int compat_fillonedir(void *__buf, const char *name, int namlen,
839 loff_t offset, u64 ino, unsigned int d_type)
840 {
841 struct compat_readdir_callback *buf = __buf;
842 struct compat_old_linux_dirent __user *dirent;
843 compat_ulong_t d_ino;
844
845 if (buf->result)
846 return -EINVAL;
847 d_ino = ino;
848 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
849 buf->result = -EOVERFLOW;
850 return -EOVERFLOW;
851 }
852 buf->result++;
853 dirent = buf->dirent;
854 if (!access_ok(VERIFY_WRITE, dirent,
855 (unsigned long)(dirent->d_name + namlen + 1) -
856 (unsigned long)dirent))
857 goto efault;
858 if ( __put_user(d_ino, &dirent->d_ino) ||
859 __put_user(offset, &dirent->d_offset) ||
860 __put_user(namlen, &dirent->d_namlen) ||
861 __copy_to_user(dirent->d_name, name, namlen) ||
862 __put_user(0, dirent->d_name + namlen))
863 goto efault;
864 return 0;
865 efault:
866 buf->result = -EFAULT;
867 return -EFAULT;
868 }
869
870 asmlinkage long compat_sys_old_readdir(unsigned int fd,
871 struct compat_old_linux_dirent __user *dirent, unsigned int count)
872 {
873 int error;
874 struct file *file;
875 struct compat_readdir_callback buf;
876
877 error = -EBADF;
878 file = fget(fd);
879 if (!file)
880 goto out;
881
882 buf.result = 0;
883 buf.dirent = dirent;
884
885 error = vfs_readdir(file, compat_fillonedir, &buf);
886 if (buf.result)
887 error = buf.result;
888
889 fput(file);
890 out:
891 return error;
892 }
893
894 struct compat_linux_dirent {
895 compat_ulong_t d_ino;
896 compat_ulong_t d_off;
897 unsigned short d_reclen;
898 char d_name[1];
899 };
900
901 struct compat_getdents_callback {
902 struct compat_linux_dirent __user *current_dir;
903 struct compat_linux_dirent __user *previous;
904 int count;
905 int error;
906 };
907
908 static int compat_filldir(void *__buf, const char *name, int namlen,
909 loff_t offset, u64 ino, unsigned int d_type)
910 {
911 struct compat_linux_dirent __user * dirent;
912 struct compat_getdents_callback *buf = __buf;
913 compat_ulong_t d_ino;
914 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
915 namlen + 2, sizeof(compat_long_t));
916
917 buf->error = -EINVAL; /* only used if we fail.. */
918 if (reclen > buf->count)
919 return -EINVAL;
920 d_ino = ino;
921 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
922 buf->error = -EOVERFLOW;
923 return -EOVERFLOW;
924 }
925 dirent = buf->previous;
926 if (dirent) {
927 if (__put_user(offset, &dirent->d_off))
928 goto efault;
929 }
930 dirent = buf->current_dir;
931 if (__put_user(d_ino, &dirent->d_ino))
932 goto efault;
933 if (__put_user(reclen, &dirent->d_reclen))
934 goto efault;
935 if (copy_to_user(dirent->d_name, name, namlen))
936 goto efault;
937 if (__put_user(0, dirent->d_name + namlen))
938 goto efault;
939 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
940 goto efault;
941 buf->previous = dirent;
942 dirent = (void __user *)dirent + reclen;
943 buf->current_dir = dirent;
944 buf->count -= reclen;
945 return 0;
946 efault:
947 buf->error = -EFAULT;
948 return -EFAULT;
949 }
950
951 asmlinkage long compat_sys_getdents(unsigned int fd,
952 struct compat_linux_dirent __user *dirent, unsigned int count)
953 {
954 struct file * file;
955 struct compat_linux_dirent __user * lastdirent;
956 struct compat_getdents_callback buf;
957 int error;
958
959 error = -EFAULT;
960 if (!access_ok(VERIFY_WRITE, dirent, count))
961 goto out;
962
963 error = -EBADF;
964 file = fget(fd);
965 if (!file)
966 goto out;
967
968 buf.current_dir = dirent;
969 buf.previous = NULL;
970 buf.count = count;
971 buf.error = 0;
972
973 error = vfs_readdir(file, compat_filldir, &buf);
974 if (error >= 0)
975 error = buf.error;
976 lastdirent = buf.previous;
977 if (lastdirent) {
978 if (put_user(file->f_pos, &lastdirent->d_off))
979 error = -EFAULT;
980 else
981 error = count - buf.count;
982 }
983 fput(file);
984 out:
985 return error;
986 }
987
988 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
989
990 struct compat_getdents_callback64 {
991 struct linux_dirent64 __user *current_dir;
992 struct linux_dirent64 __user *previous;
993 int count;
994 int error;
995 };
996
997 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
998 u64 ino, unsigned int d_type)
999 {
1000 struct linux_dirent64 __user *dirent;
1001 struct compat_getdents_callback64 *buf = __buf;
1002 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1003 sizeof(u64));
1004 u64 off;
1005
1006 buf->error = -EINVAL; /* only used if we fail.. */
1007 if (reclen > buf->count)
1008 return -EINVAL;
1009 dirent = buf->previous;
1010
1011 if (dirent) {
1012 if (__put_user_unaligned(offset, &dirent->d_off))
1013 goto efault;
1014 }
1015 dirent = buf->current_dir;
1016 if (__put_user_unaligned(ino, &dirent->d_ino))
1017 goto efault;
1018 off = 0;
1019 if (__put_user_unaligned(off, &dirent->d_off))
1020 goto efault;
1021 if (__put_user(reclen, &dirent->d_reclen))
1022 goto efault;
1023 if (__put_user(d_type, &dirent->d_type))
1024 goto efault;
1025 if (copy_to_user(dirent->d_name, name, namlen))
1026 goto efault;
1027 if (__put_user(0, dirent->d_name + namlen))
1028 goto efault;
1029 buf->previous = dirent;
1030 dirent = (void __user *)dirent + reclen;
1031 buf->current_dir = dirent;
1032 buf->count -= reclen;
1033 return 0;
1034 efault:
1035 buf->error = -EFAULT;
1036 return -EFAULT;
1037 }
1038
1039 asmlinkage long compat_sys_getdents64(unsigned int fd,
1040 struct linux_dirent64 __user * dirent, unsigned int count)
1041 {
1042 struct file * file;
1043 struct linux_dirent64 __user * lastdirent;
1044 struct compat_getdents_callback64 buf;
1045 int error;
1046
1047 error = -EFAULT;
1048 if (!access_ok(VERIFY_WRITE, dirent, count))
1049 goto out;
1050
1051 error = -EBADF;
1052 file = fget(fd);
1053 if (!file)
1054 goto out;
1055
1056 buf.current_dir = dirent;
1057 buf.previous = NULL;
1058 buf.count = count;
1059 buf.error = 0;
1060
1061 error = vfs_readdir(file, compat_filldir64, &buf);
1062 if (error >= 0)
1063 error = buf.error;
1064 lastdirent = buf.previous;
1065 if (lastdirent) {
1066 typeof(lastdirent->d_off) d_off = file->f_pos;
1067 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1068 error = -EFAULT;
1069 else
1070 error = count - buf.count;
1071 }
1072 fput(file);
1073 out:
1074 return error;
1075 }
1076 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1077
1078 static ssize_t compat_do_readv_writev(int type, struct file *file,
1079 const struct compat_iovec __user *uvector,
1080 unsigned long nr_segs, loff_t *pos)
1081 {
1082 compat_ssize_t tot_len;
1083 struct iovec iovstack[UIO_FASTIOV];
1084 struct iovec *iov = iovstack;
1085 ssize_t ret;
1086 io_fn_t fn;
1087 iov_fn_t fnv;
1088
1089 ret = -EINVAL;
1090 if (!file->f_op)
1091 goto out;
1092
1093 ret = -EFAULT;
1094 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1095 goto out;
1096
1097 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1098 UIO_FASTIOV, iovstack, &iov, 1);
1099 if (tot_len == 0) {
1100 ret = 0;
1101 goto out;
1102 }
1103
1104 ret = rw_verify_area(type, file, pos, tot_len);
1105 if (ret < 0)
1106 goto out;
1107
1108 fnv = NULL;
1109 if (type == READ) {
1110 fn = file->f_op->read;
1111 fnv = file->f_op->aio_read;
1112 } else {
1113 fn = (io_fn_t)file->f_op->write;
1114 fnv = file->f_op->aio_write;
1115 }
1116
1117 if (fnv)
1118 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1119 pos, fnv);
1120 else
1121 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1122
1123 out:
1124 if (iov != iovstack)
1125 kfree(iov);
1126 if ((ret + (type == READ)) > 0) {
1127 if (type == READ)
1128 fsnotify_access(file);
1129 else
1130 fsnotify_modify(file);
1131 }
1132 return ret;
1133 }
1134
1135 static size_t compat_readv(struct file *file,
1136 const struct compat_iovec __user *vec,
1137 unsigned long vlen, loff_t *pos)
1138 {
1139 ssize_t ret = -EBADF;
1140
1141 if (!(file->f_mode & FMODE_READ))
1142 goto out;
1143
1144 ret = -EINVAL;
1145 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1146 goto out;
1147
1148 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1149
1150 out:
1151 if (ret > 0)
1152 add_rchar(current, ret);
1153 inc_syscr(current);
1154 return ret;
1155 }
1156
1157 asmlinkage ssize_t
1158 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1159 unsigned long vlen)
1160 {
1161 struct file *file;
1162 int fput_needed;
1163 ssize_t ret;
1164
1165 file = fget_light(fd, &fput_needed);
1166 if (!file)
1167 return -EBADF;
1168 ret = compat_readv(file, vec, vlen, &file->f_pos);
1169 fput_light(file, fput_needed);
1170 return ret;
1171 }
1172
1173 asmlinkage ssize_t
1174 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1175 unsigned long vlen, u32 pos_low, u32 pos_high)
1176 {
1177 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1178 struct file *file;
1179 int fput_needed;
1180 ssize_t ret;
1181
1182 if (pos < 0)
1183 return -EINVAL;
1184 file = fget_light(fd, &fput_needed);
1185 if (!file)
1186 return -EBADF;
1187 ret = -ESPIPE;
1188 if (file->f_mode & FMODE_PREAD)
1189 ret = compat_readv(file, vec, vlen, &pos);
1190 fput_light(file, fput_needed);
1191 return ret;
1192 }
1193
1194 static size_t compat_writev(struct file *file,
1195 const struct compat_iovec __user *vec,
1196 unsigned long vlen, loff_t *pos)
1197 {
1198 ssize_t ret = -EBADF;
1199
1200 if (!(file->f_mode & FMODE_WRITE))
1201 goto out;
1202
1203 ret = -EINVAL;
1204 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1205 goto out;
1206
1207 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1208
1209 out:
1210 if (ret > 0)
1211 add_wchar(current, ret);
1212 inc_syscw(current);
1213 return ret;
1214 }
1215
1216 asmlinkage ssize_t
1217 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1218 unsigned long vlen)
1219 {
1220 struct file *file;
1221 int fput_needed;
1222 ssize_t ret;
1223
1224 file = fget_light(fd, &fput_needed);
1225 if (!file)
1226 return -EBADF;
1227 ret = compat_writev(file, vec, vlen, &file->f_pos);
1228 fput_light(file, fput_needed);
1229 return ret;
1230 }
1231
1232 asmlinkage ssize_t
1233 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1234 unsigned long vlen, u32 pos_low, u32 pos_high)
1235 {
1236 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1237 struct file *file;
1238 int fput_needed;
1239 ssize_t ret;
1240
1241 if (pos < 0)
1242 return -EINVAL;
1243 file = fget_light(fd, &fput_needed);
1244 if (!file)
1245 return -EBADF;
1246 ret = -ESPIPE;
1247 if (file->f_mode & FMODE_PWRITE)
1248 ret = compat_writev(file, vec, vlen, &pos);
1249 fput_light(file, fput_needed);
1250 return ret;
1251 }
1252
1253 asmlinkage long
1254 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1255 unsigned int nr_segs, unsigned int flags)
1256 {
1257 unsigned i;
1258 struct iovec __user *iov;
1259 if (nr_segs > UIO_MAXIOV)
1260 return -EINVAL;
1261 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1262 for (i = 0; i < nr_segs; i++) {
1263 struct compat_iovec v;
1264 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1265 get_user(v.iov_len, &iov32[i].iov_len) ||
1266 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1267 put_user(v.iov_len, &iov[i].iov_len))
1268 return -EFAULT;
1269 }
1270 return sys_vmsplice(fd, iov, nr_segs, flags);
1271 }
1272
1273 /*
1274 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1275 * O_LARGEFILE flag.
1276 */
1277 asmlinkage long
1278 compat_sys_open(const char __user *filename, int flags, umode_t mode)
1279 {
1280 return do_sys_open(AT_FDCWD, filename, flags, mode);
1281 }
1282
1283 /*
1284 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1285 * O_LARGEFILE flag.
1286 */
1287 asmlinkage long
1288 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
1289 {
1290 return do_sys_open(dfd, filename, flags, mode);
1291 }
1292
1293 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1294
1295 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1296 int timeval, int ret)
1297 {
1298 struct timespec ts;
1299
1300 if (!p)
1301 return ret;
1302
1303 if (current->personality & STICKY_TIMEOUTS)
1304 goto sticky;
1305
1306 /* No update for zero timeout */
1307 if (!end_time->tv_sec && !end_time->tv_nsec)
1308 return ret;
1309
1310 ktime_get_ts(&ts);
1311 ts = timespec_sub(*end_time, ts);
1312 if (ts.tv_sec < 0)
1313 ts.tv_sec = ts.tv_nsec = 0;
1314
1315 if (timeval) {
1316 struct compat_timeval rtv;
1317
1318 rtv.tv_sec = ts.tv_sec;
1319 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1320
1321 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1322 return ret;
1323 } else {
1324 struct compat_timespec rts;
1325
1326 rts.tv_sec = ts.tv_sec;
1327 rts.tv_nsec = ts.tv_nsec;
1328
1329 if (!copy_to_user(p, &rts, sizeof(rts)))
1330 return ret;
1331 }
1332 /*
1333 * If an application puts its timeval in read-only memory, we
1334 * don't want the Linux-specific update to the timeval to
1335 * cause a fault after the select has completed
1336 * successfully. However, because we're not updating the
1337 * timeval, we can't restart the system call.
1338 */
1339
1340 sticky:
1341 if (ret == -ERESTARTNOHAND)
1342 ret = -EINTR;
1343 return ret;
1344 }
1345
1346 /*
1347 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1348 * 64-bit unsigned longs.
1349 */
1350 static
1351 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1352 unsigned long *fdset)
1353 {
1354 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1355 if (ufdset) {
1356 unsigned long odd;
1357
1358 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1359 return -EFAULT;
1360
1361 odd = nr & 1UL;
1362 nr &= ~1UL;
1363 while (nr) {
1364 unsigned long h, l;
1365 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1366 return -EFAULT;
1367 ufdset += 2;
1368 *fdset++ = h << 32 | l;
1369 nr -= 2;
1370 }
1371 if (odd && __get_user(*fdset, ufdset))
1372 return -EFAULT;
1373 } else {
1374 /* Tricky, must clear full unsigned long in the
1375 * kernel fdset at the end, this makes sure that
1376 * actually happens.
1377 */
1378 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1379 }
1380 return 0;
1381 }
1382
1383 static
1384 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1385 unsigned long *fdset)
1386 {
1387 unsigned long odd;
1388 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1389
1390 if (!ufdset)
1391 return 0;
1392
1393 odd = nr & 1UL;
1394 nr &= ~1UL;
1395 while (nr) {
1396 unsigned long h, l;
1397 l = *fdset++;
1398 h = l >> 32;
1399 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1400 return -EFAULT;
1401 ufdset += 2;
1402 nr -= 2;
1403 }
1404 if (odd && __put_user(*fdset, ufdset))
1405 return -EFAULT;
1406 return 0;
1407 }
1408
1409
1410 /*
1411 * This is a virtual copy of sys_select from fs/select.c and probably
1412 * should be compared to it from time to time
1413 */
1414
1415 /*
1416 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1417 * like to be certain this leads to no problems. So I return
1418 * EINTR just for safety.
1419 *
1420 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1421 * I'm trying ERESTARTNOHAND which restart only when you want to.
1422 */
1423 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1424 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1425 struct timespec *end_time)
1426 {
1427 fd_set_bits fds;
1428 void *bits;
1429 int size, max_fds, ret = -EINVAL;
1430 struct fdtable *fdt;
1431 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1432
1433 if (n < 0)
1434 goto out_nofds;
1435
1436 /* max_fds can increase, so grab it once to avoid race */
1437 rcu_read_lock();
1438 fdt = files_fdtable(current->files);
1439 max_fds = fdt->max_fds;
1440 rcu_read_unlock();
1441 if (n > max_fds)
1442 n = max_fds;
1443
1444 /*
1445 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1446 * since we used fdset we need to allocate memory in units of
1447 * long-words.
1448 */
1449 size = FDS_BYTES(n);
1450 bits = stack_fds;
1451 if (size > sizeof(stack_fds) / 6) {
1452 bits = kmalloc(6 * size, GFP_KERNEL);
1453 ret = -ENOMEM;
1454 if (!bits)
1455 goto out_nofds;
1456 }
1457 fds.in = (unsigned long *) bits;
1458 fds.out = (unsigned long *) (bits + size);
1459 fds.ex = (unsigned long *) (bits + 2*size);
1460 fds.res_in = (unsigned long *) (bits + 3*size);
1461 fds.res_out = (unsigned long *) (bits + 4*size);
1462 fds.res_ex = (unsigned long *) (bits + 5*size);
1463
1464 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1465 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1466 (ret = compat_get_fd_set(n, exp, fds.ex)))
1467 goto out;
1468 zero_fd_set(n, fds.res_in);
1469 zero_fd_set(n, fds.res_out);
1470 zero_fd_set(n, fds.res_ex);
1471
1472 ret = do_select(n, &fds, end_time);
1473
1474 if (ret < 0)
1475 goto out;
1476 if (!ret) {
1477 ret = -ERESTARTNOHAND;
1478 if (signal_pending(current))
1479 goto out;
1480 ret = 0;
1481 }
1482
1483 if (compat_set_fd_set(n, inp, fds.res_in) ||
1484 compat_set_fd_set(n, outp, fds.res_out) ||
1485 compat_set_fd_set(n, exp, fds.res_ex))
1486 ret = -EFAULT;
1487 out:
1488 if (bits != stack_fds)
1489 kfree(bits);
1490 out_nofds:
1491 return ret;
1492 }
1493
1494 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1495 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1496 struct compat_timeval __user *tvp)
1497 {
1498 struct timespec end_time, *to = NULL;
1499 struct compat_timeval tv;
1500 int ret;
1501
1502 if (tvp) {
1503 if (copy_from_user(&tv, tvp, sizeof(tv)))
1504 return -EFAULT;
1505
1506 to = &end_time;
1507 if (poll_select_set_timeout(to,
1508 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1509 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1510 return -EINVAL;
1511 }
1512
1513 ret = compat_core_sys_select(n, inp, outp, exp, to);
1514 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1515
1516 return ret;
1517 }
1518
1519 struct compat_sel_arg_struct {
1520 compat_ulong_t n;
1521 compat_uptr_t inp;
1522 compat_uptr_t outp;
1523 compat_uptr_t exp;
1524 compat_uptr_t tvp;
1525 };
1526
1527 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1528 {
1529 struct compat_sel_arg_struct a;
1530
1531 if (copy_from_user(&a, arg, sizeof(a)))
1532 return -EFAULT;
1533 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1534 compat_ptr(a.exp), compat_ptr(a.tvp));
1535 }
1536
1537 #ifdef HAVE_SET_RESTORE_SIGMASK
1538 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1539 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1540 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1541 compat_size_t sigsetsize)
1542 {
1543 compat_sigset_t ss32;
1544 sigset_t ksigmask, sigsaved;
1545 struct compat_timespec ts;
1546 struct timespec end_time, *to = NULL;
1547 int ret;
1548
1549 if (tsp) {
1550 if (copy_from_user(&ts, tsp, sizeof(ts)))
1551 return -EFAULT;
1552
1553 to = &end_time;
1554 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1555 return -EINVAL;
1556 }
1557
1558 if (sigmask) {
1559 if (sigsetsize != sizeof(compat_sigset_t))
1560 return -EINVAL;
1561 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1562 return -EFAULT;
1563 sigset_from_compat(&ksigmask, &ss32);
1564
1565 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1566 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1567 }
1568
1569 ret = compat_core_sys_select(n, inp, outp, exp, to);
1570 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1571
1572 if (ret == -ERESTARTNOHAND) {
1573 /*
1574 * Don't restore the signal mask yet. Let do_signal() deliver
1575 * the signal on the way back to userspace, before the signal
1576 * mask is restored.
1577 */
1578 if (sigmask) {
1579 memcpy(&current->saved_sigmask, &sigsaved,
1580 sizeof(sigsaved));
1581 set_restore_sigmask();
1582 }
1583 } else if (sigmask)
1584 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1585
1586 return ret;
1587 }
1588
1589 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1590 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1591 struct compat_timespec __user *tsp, void __user *sig)
1592 {
1593 compat_size_t sigsetsize = 0;
1594 compat_uptr_t up = 0;
1595
1596 if (sig) {
1597 if (!access_ok(VERIFY_READ, sig,
1598 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1599 __get_user(up, (compat_uptr_t __user *)sig) ||
1600 __get_user(sigsetsize,
1601 (compat_size_t __user *)(sig+sizeof(up))))
1602 return -EFAULT;
1603 }
1604 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1605 sigsetsize);
1606 }
1607
1608 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1609 unsigned int nfds, struct compat_timespec __user *tsp,
1610 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1611 {
1612 compat_sigset_t ss32;
1613 sigset_t ksigmask, sigsaved;
1614 struct compat_timespec ts;
1615 struct timespec end_time, *to = NULL;
1616 int ret;
1617
1618 if (tsp) {
1619 if (copy_from_user(&ts, tsp, sizeof(ts)))
1620 return -EFAULT;
1621
1622 to = &end_time;
1623 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1624 return -EINVAL;
1625 }
1626
1627 if (sigmask) {
1628 if (sigsetsize != sizeof(compat_sigset_t))
1629 return -EINVAL;
1630 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1631 return -EFAULT;
1632 sigset_from_compat(&ksigmask, &ss32);
1633
1634 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1635 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1636 }
1637
1638 ret = do_sys_poll(ufds, nfds, to);
1639
1640 /* We can restart this syscall, usually */
1641 if (ret == -EINTR) {
1642 /*
1643 * Don't restore the signal mask yet. Let do_signal() deliver
1644 * the signal on the way back to userspace, before the signal
1645 * mask is restored.
1646 */
1647 if (sigmask) {
1648 memcpy(&current->saved_sigmask, &sigsaved,
1649 sizeof(sigsaved));
1650 set_restore_sigmask();
1651 }
1652 ret = -ERESTARTNOHAND;
1653 } else if (sigmask)
1654 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1655
1656 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1657
1658 return ret;
1659 }
1660 #endif /* HAVE_SET_RESTORE_SIGMASK */
1661
1662 #ifdef CONFIG_EPOLL
1663
1664 #ifdef HAVE_SET_RESTORE_SIGMASK
1665 asmlinkage long compat_sys_epoll_pwait(int epfd,
1666 struct compat_epoll_event __user *events,
1667 int maxevents, int timeout,
1668 const compat_sigset_t __user *sigmask,
1669 compat_size_t sigsetsize)
1670 {
1671 long err;
1672 compat_sigset_t csigmask;
1673 sigset_t ksigmask, sigsaved;
1674
1675 /*
1676 * If the caller wants a certain signal mask to be set during the wait,
1677 * we apply it here.
1678 */
1679 if (sigmask) {
1680 if (sigsetsize != sizeof(compat_sigset_t))
1681 return -EINVAL;
1682 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1683 return -EFAULT;
1684 sigset_from_compat(&ksigmask, &csigmask);
1685 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1686 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1687 }
1688
1689 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1690
1691 /*
1692 * If we changed the signal mask, we need to restore the original one.
1693 * In case we've got a signal while waiting, we do not restore the
1694 * signal mask yet, and we allow do_signal() to deliver the signal on
1695 * the way back to userspace, before the signal mask is restored.
1696 */
1697 if (sigmask) {
1698 if (err == -EINTR) {
1699 memcpy(&current->saved_sigmask, &sigsaved,
1700 sizeof(sigsaved));
1701 set_restore_sigmask();
1702 } else
1703 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1704 }
1705
1706 return err;
1707 }
1708 #endif /* HAVE_SET_RESTORE_SIGMASK */
1709
1710 #endif /* CONFIG_EPOLL */
1711
1712 #ifdef CONFIG_SIGNALFD
1713
1714 asmlinkage long compat_sys_signalfd4(int ufd,
1715 const compat_sigset_t __user *sigmask,
1716 compat_size_t sigsetsize, int flags)
1717 {
1718 compat_sigset_t ss32;
1719 sigset_t tmp;
1720 sigset_t __user *ksigmask;
1721
1722 if (sigsetsize != sizeof(compat_sigset_t))
1723 return -EINVAL;
1724 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1725 return -EFAULT;
1726 sigset_from_compat(&tmp, &ss32);
1727 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1728 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1729 return -EFAULT;
1730
1731 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1732 }
1733
1734 asmlinkage long compat_sys_signalfd(int ufd,
1735 const compat_sigset_t __user *sigmask,
1736 compat_size_t sigsetsize)
1737 {
1738 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1739 }
1740 #endif /* CONFIG_SIGNALFD */
1741
1742 #ifdef CONFIG_TIMERFD
1743
1744 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1745 const struct compat_itimerspec __user *utmr,
1746 struct compat_itimerspec __user *otmr)
1747 {
1748 int error;
1749 struct itimerspec t;
1750 struct itimerspec __user *ut;
1751
1752 if (get_compat_itimerspec(&t, utmr))
1753 return -EFAULT;
1754 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1755 if (copy_to_user(&ut[0], &t, sizeof(t)))
1756 return -EFAULT;
1757 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1758 if (!error && otmr)
1759 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1760 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1761
1762 return error;
1763 }
1764
1765 asmlinkage long compat_sys_timerfd_gettime(int ufd,
1766 struct compat_itimerspec __user *otmr)
1767 {
1768 int error;
1769 struct itimerspec t;
1770 struct itimerspec __user *ut;
1771
1772 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1773 error = sys_timerfd_gettime(ufd, ut);
1774 if (!error)
1775 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1776 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1777
1778 return error;
1779 }
1780
1781 #endif /* CONFIG_TIMERFD */
1782
1783 #ifdef CONFIG_FHANDLE
1784 /*
1785 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1786 * doesn't set the O_LARGEFILE flag.
1787 */
1788 asmlinkage long
1789 compat_sys_open_by_handle_at(int mountdirfd,
1790 struct file_handle __user *handle, int flags)
1791 {
1792 return do_handle_open(mountdirfd, handle, flags);
1793 }
1794 #endif