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Linux 3.4.76
[linux/fpc-iii.git] / fs / compat.c
blob56acdcb84fb07c48ce684f62a3f31e83455b4dce
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/dirent.h>
37 #include <linux/fsnotify.h>
38 #include <linux/highuid.h>
39 #include <linux/personality.h>
40 #include <linux/rwsem.h>
41 #include <linux/tsacct_kern.h>
42 #include <linux/security.h>
43 #include <linux/highmem.h>
44 #include <linux/signal.h>
45 #include <linux/poll.h>
46 #include <linux/mm.h>
47 #include <linux/eventpoll.h>
48 #include <linux/fs_struct.h>
49 #include <linux/slab.h>
50 #include <linux/pagemap.h>
51
52 #include <asm/uaccess.h>
53 #include <asm/mmu_context.h>
54 #include <asm/ioctls.h>
55 #include "internal.h"
56
57 int compat_log = 1;
58
59 int compat_printk(const char *fmt, ...)
60 {
61 va_list ap;
62 int ret;
63 if (!compat_log)
64 return 0;
65 va_start(ap, fmt);
66 ret = vprintk(fmt, ap);
67 va_end(ap);
68 return ret;
69 }
70
71 #include "read_write.h"
72
73 /*
74 * Not all architectures have sys_utime, so implement this in terms
75 * of sys_utimes.
76 */
77 asmlinkage long compat_sys_utime(const char __user *filename,
78 struct compat_utimbuf __user *t)
79 {
80 struct timespec tv[2];
81
82 if (t) {
83 if (get_user(tv[0].tv_sec, &t->actime) ||
84 get_user(tv[1].tv_sec, &t->modtime))
85 return -EFAULT;
86 tv[0].tv_nsec = 0;
87 tv[1].tv_nsec = 0;
88 }
89 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
90 }
91
92 asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
93 {
94 struct timespec tv[2];
95
96 if (t) {
97 if (get_compat_timespec(&tv[0], &t[0]) ||
98 get_compat_timespec(&tv[1], &t[1]))
99 return -EFAULT;
100
101 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
102 return 0;
103 }
104 return do_utimes(dfd, filename, t ? tv : NULL, flags);
105 }
106
107 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
108 {
109 struct timespec tv[2];
110
111 if (t) {
112 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
113 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
114 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
115 get_user(tv[1].tv_nsec, &t[1].tv_usec))
116 return -EFAULT;
117 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
118 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
119 return -EINVAL;
120 tv[0].tv_nsec *= 1000;
121 tv[1].tv_nsec *= 1000;
122 }
123 return do_utimes(dfd, filename, t ? tv : NULL, 0);
124 }
125
126 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
127 {
128 return compat_sys_futimesat(AT_FDCWD, filename, t);
129 }
130
131 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
132 {
133 struct compat_stat tmp;
134
135 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
136 return -EOVERFLOW;
137
138 memset(&tmp, 0, sizeof(tmp));
139 tmp.st_dev = old_encode_dev(stat->dev);
140 tmp.st_ino = stat->ino;
141 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
142 return -EOVERFLOW;
143 tmp.st_mode = stat->mode;
144 tmp.st_nlink = stat->nlink;
145 if (tmp.st_nlink != stat->nlink)
146 return -EOVERFLOW;
147 SET_UID(tmp.st_uid, stat->uid);
148 SET_GID(tmp.st_gid, stat->gid);
149 tmp.st_rdev = old_encode_dev(stat->rdev);
150 if ((u64) stat->size > MAX_NON_LFS)
151 return -EOVERFLOW;
152 tmp.st_size = stat->size;
153 tmp.st_atime = stat->atime.tv_sec;
154 tmp.st_atime_nsec = stat->atime.tv_nsec;
155 tmp.st_mtime = stat->mtime.tv_sec;
156 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
157 tmp.st_ctime = stat->ctime.tv_sec;
158 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
159 tmp.st_blocks = stat->blocks;
160 tmp.st_blksize = stat->blksize;
161 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
162 }
163
164 asmlinkage long compat_sys_newstat(const char __user * filename,
165 struct compat_stat __user *statbuf)
166 {
167 struct kstat stat;
168 int error;
169
170 error = vfs_stat(filename, &stat);
171 if (error)
172 return error;
173 return cp_compat_stat(&stat, statbuf);
174 }
175
176 asmlinkage long compat_sys_newlstat(const char __user * filename,
177 struct compat_stat __user *statbuf)
178 {
179 struct kstat stat;
180 int error;
181
182 error = vfs_lstat(filename, &stat);
183 if (error)
184 return error;
185 return cp_compat_stat(&stat, statbuf);
186 }
187
188 #ifndef __ARCH_WANT_STAT64
189 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
190 const char __user *filename,
191 struct compat_stat __user *statbuf, int flag)
192 {
193 struct kstat stat;
194 int error;
195
196 error = vfs_fstatat(dfd, filename, &stat, flag);
197 if (error)
198 return error;
199 return cp_compat_stat(&stat, statbuf);
200 }
201 #endif
202
203 asmlinkage long compat_sys_newfstat(unsigned int fd,
204 struct compat_stat __user * statbuf)
205 {
206 struct kstat stat;
207 int error = vfs_fstat(fd, &stat);
208
209 if (!error)
210 error = cp_compat_stat(&stat, statbuf);
211 return error;
212 }
213
214 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
215 {
216
217 if (sizeof ubuf->f_blocks == 4) {
218 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
219 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
220 return -EOVERFLOW;
221 /* f_files and f_ffree may be -1; it's okay
222 * to stuff that into 32 bits */
223 if (kbuf->f_files != 0xffffffffffffffffULL
224 && (kbuf->f_files & 0xffffffff00000000ULL))
225 return -EOVERFLOW;
226 if (kbuf->f_ffree != 0xffffffffffffffffULL
227 && (kbuf->f_ffree & 0xffffffff00000000ULL))
228 return -EOVERFLOW;
229 }
230 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
231 __put_user(kbuf->f_type, &ubuf->f_type) ||
232 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
233 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
234 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
235 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
236 __put_user(kbuf->f_files, &ubuf->f_files) ||
237 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
238 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
239 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
240 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
241 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
242 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
243 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
244 return -EFAULT;
245 return 0;
246 }
247
248 /*
249 * The following statfs calls are copies of code from fs/statfs.c and
250 * should be checked against those from time to time
251 */
252 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
253 {
254 struct kstatfs tmp;
255 int error = user_statfs(pathname, &tmp);
256 if (!error)
257 error = put_compat_statfs(buf, &tmp);
258 return error;
259 }
260
261 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
262 {
263 struct kstatfs tmp;
264 int error = fd_statfs(fd, &tmp);
265 if (!error)
266 error = put_compat_statfs(buf, &tmp);
267 return error;
268 }
269
270 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
271 {
272 if (sizeof ubuf->f_blocks == 4) {
273 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
274 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
275 return -EOVERFLOW;
276 /* f_files and f_ffree may be -1; it's okay
277 * to stuff that into 32 bits */
278 if (kbuf->f_files != 0xffffffffffffffffULL
279 && (kbuf->f_files & 0xffffffff00000000ULL))
280 return -EOVERFLOW;
281 if (kbuf->f_ffree != 0xffffffffffffffffULL
282 && (kbuf->f_ffree & 0xffffffff00000000ULL))
283 return -EOVERFLOW;
284 }
285 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
286 __put_user(kbuf->f_type, &ubuf->f_type) ||
287 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
288 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
289 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
290 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
291 __put_user(kbuf->f_files, &ubuf->f_files) ||
292 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
293 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
294 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
295 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
296 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
297 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
298 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
299 return -EFAULT;
300 return 0;
301 }
302
303 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
304 {
305 struct kstatfs tmp;
306 int error;
307
308 if (sz != sizeof(*buf))
309 return -EINVAL;
310
311 error = user_statfs(pathname, &tmp);
312 if (!error)
313 error = put_compat_statfs64(buf, &tmp);
314 return error;
315 }
316
317 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
318 {
319 struct kstatfs tmp;
320 int error;
321
322 if (sz != sizeof(*buf))
323 return -EINVAL;
324
325 error = fd_statfs(fd, &tmp);
326 if (!error)
327 error = put_compat_statfs64(buf, &tmp);
328 return error;
329 }
330
331 /*
332 * This is a copy of sys_ustat, just dealing with a structure layout.
333 * Given how simple this syscall is that apporach is more maintainable
334 * than the various conversion hacks.
335 */
336 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
337 {
338 struct compat_ustat tmp;
339 struct kstatfs sbuf;
340 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
341 if (err)
342 return err;
343
344 memset(&tmp, 0, sizeof(struct compat_ustat));
345 tmp.f_tfree = sbuf.f_bfree;
346 tmp.f_tinode = sbuf.f_ffree;
347 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
348 return -EFAULT;
349 return 0;
350 }
351
352 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
353 {
354 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
355 __get_user(kfl->l_type, &ufl->l_type) ||
356 __get_user(kfl->l_whence, &ufl->l_whence) ||
357 __get_user(kfl->l_start, &ufl->l_start) ||
358 __get_user(kfl->l_len, &ufl->l_len) ||
359 __get_user(kfl->l_pid, &ufl->l_pid))
360 return -EFAULT;
361 return 0;
362 }
363
364 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
365 {
366 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
367 __put_user(kfl->l_type, &ufl->l_type) ||
368 __put_user(kfl->l_whence, &ufl->l_whence) ||
369 __put_user(kfl->l_start, &ufl->l_start) ||
370 __put_user(kfl->l_len, &ufl->l_len) ||
371 __put_user(kfl->l_pid, &ufl->l_pid))
372 return -EFAULT;
373 return 0;
374 }
375
376 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
377 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
378 {
379 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
380 __get_user(kfl->l_type, &ufl->l_type) ||
381 __get_user(kfl->l_whence, &ufl->l_whence) ||
382 __get_user(kfl->l_start, &ufl->l_start) ||
383 __get_user(kfl->l_len, &ufl->l_len) ||
384 __get_user(kfl->l_pid, &ufl->l_pid))
385 return -EFAULT;
386 return 0;
387 }
388 #endif
389
390 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
391 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
392 {
393 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
394 __put_user(kfl->l_type, &ufl->l_type) ||
395 __put_user(kfl->l_whence, &ufl->l_whence) ||
396 __put_user(kfl->l_start, &ufl->l_start) ||
397 __put_user(kfl->l_len, &ufl->l_len) ||
398 __put_user(kfl->l_pid, &ufl->l_pid))
399 return -EFAULT;
400 return 0;
401 }
402 #endif
403
404 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
405 unsigned long arg)
406 {
407 mm_segment_t old_fs;
408 struct flock f;
409 long ret;
410
411 switch (cmd) {
412 case F_GETLK:
413 case F_SETLK:
414 case F_SETLKW:
415 ret = get_compat_flock(&f, compat_ptr(arg));
416 if (ret != 0)
417 break;
418 old_fs = get_fs();
419 set_fs(KERNEL_DS);
420 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
421 set_fs(old_fs);
422 if (cmd == F_GETLK && ret == 0) {
423 /* GETLK was successful and we need to return the data...
424 * but it needs to fit in the compat structure.
425 * l_start shouldn't be too big, unless the original
426 * start + end is greater than COMPAT_OFF_T_MAX, in which
427 * case the app was asking for trouble, so we return
428 * -EOVERFLOW in that case.
429 * l_len could be too big, in which case we just truncate it,
430 * and only allow the app to see that part of the conflicting
431 * lock that might make sense to it anyway
432 */
433
434 if (f.l_start > COMPAT_OFF_T_MAX)
435 ret = -EOVERFLOW;
436 if (f.l_len > COMPAT_OFF_T_MAX)
437 f.l_len = COMPAT_OFF_T_MAX;
438 if (ret == 0)
439 ret = put_compat_flock(&f, compat_ptr(arg));
440 }
441 break;
442
443 case F_GETLK64:
444 case F_SETLK64:
445 case F_SETLKW64:
446 ret = get_compat_flock64(&f, compat_ptr(arg));
447 if (ret != 0)
448 break;
449 old_fs = get_fs();
450 set_fs(KERNEL_DS);
451 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
452 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
453 (unsigned long)&f);
454 set_fs(old_fs);
455 if (cmd == F_GETLK64 && ret == 0) {
456 /* need to return lock information - see above for commentary */
457 if (f.l_start > COMPAT_LOFF_T_MAX)
458 ret = -EOVERFLOW;
459 if (f.l_len > COMPAT_LOFF_T_MAX)
460 f.l_len = COMPAT_LOFF_T_MAX;
461 if (ret == 0)
462 ret = put_compat_flock64(&f, compat_ptr(arg));
463 }
464 break;
465
466 default:
467 ret = sys_fcntl(fd, cmd, arg);
468 break;
469 }
470 return ret;
471 }
472
473 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
474 unsigned long arg)
475 {
476 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
477 return -EINVAL;
478 return compat_sys_fcntl64(fd, cmd, arg);
479 }
480
481 asmlinkage long
482 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
483 {
484 long ret;
485 aio_context_t ctx64;
486
487 mm_segment_t oldfs = get_fs();
488 if (unlikely(get_user(ctx64, ctx32p)))
489 return -EFAULT;
490
491 set_fs(KERNEL_DS);
492 /* The __user pointer cast is valid because of the set_fs() */
493 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
494 set_fs(oldfs);
495 /* truncating is ok because it's a user address */
496 if (!ret)
497 ret = put_user((u32) ctx64, ctx32p);
498 return ret;
499 }
500
501 asmlinkage long
502 compat_sys_io_getevents(aio_context_t ctx_id,
503 unsigned long min_nr,
504 unsigned long nr,
505 struct io_event __user *events,
506 struct compat_timespec __user *timeout)
507 {
508 long ret;
509 struct timespec t;
510 struct timespec __user *ut = NULL;
511
512 ret = -EFAULT;
513 if (unlikely(!access_ok(VERIFY_WRITE, events,
514 nr * sizeof(struct io_event))))
515 goto out;
516 if (timeout) {
517 if (get_compat_timespec(&t, timeout))
518 goto out;
519
520 ut = compat_alloc_user_space(sizeof(*ut));
521 if (copy_to_user(ut, &t, sizeof(t)) )
522 goto out;
523 }
524 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
525 out:
526 return ret;
527 }
528
529 /* A write operation does a read from user space and vice versa */
530 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
531
532 ssize_t compat_rw_copy_check_uvector(int type,
533 const struct compat_iovec __user *uvector, unsigned long nr_segs,
534 unsigned long fast_segs, struct iovec *fast_pointer,
535 struct iovec **ret_pointer, int check_access)
536 {
537 compat_ssize_t tot_len;
538 struct iovec *iov = *ret_pointer = fast_pointer;
539 ssize_t ret = 0;
540 int seg;
541
542 /*
543 * SuS says "The readv() function *may* fail if the iovcnt argument
544 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
545 * traditionally returned zero for zero segments, so...
546 */
547 if (nr_segs == 0)
548 goto out;
549
550 ret = -EINVAL;
551 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
552 goto out;
553 if (nr_segs > fast_segs) {
554 ret = -ENOMEM;
555 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
556 if (iov == NULL)
557 goto out;
558 }
559 *ret_pointer = iov;
560
561 ret = -EFAULT;
562 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
563 goto out;
564
565 /*
566 * Single unix specification:
567 * We should -EINVAL if an element length is not >= 0 and fitting an
568 * ssize_t.
569 *
570 * In Linux, the total length is limited to MAX_RW_COUNT, there is
571 * no overflow possibility.
572 */
573 tot_len = 0;
574 ret = -EINVAL;
575 for (seg = 0; seg < nr_segs; seg++) {
576 compat_uptr_t buf;
577 compat_ssize_t len;
578
579 if (__get_user(len, &uvector->iov_len) ||
580 __get_user(buf, &uvector->iov_base)) {
581 ret = -EFAULT;
582 goto out;
583 }
584 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
585 goto out;
586 if (check_access &&
587 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
588 ret = -EFAULT;
589 goto out;
590 }
591 if (len > MAX_RW_COUNT - tot_len)
592 len = MAX_RW_COUNT - tot_len;
593 tot_len += len;
594 iov->iov_base = compat_ptr(buf);
595 iov->iov_len = (compat_size_t) len;
596 uvector++;
597 iov++;
598 }
599 ret = tot_len;
600
601 out:
602 return ret;
603 }
604
605 static inline long
606 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
607 {
608 compat_uptr_t uptr;
609 int i;
610
611 for (i = 0; i < nr; ++i) {
612 if (get_user(uptr, ptr32 + i))
613 return -EFAULT;
614 if (put_user(compat_ptr(uptr), ptr64 + i))
615 return -EFAULT;
616 }
617 return 0;
618 }
619
620 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
621
622 asmlinkage long
623 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
624 {
625 struct iocb __user * __user *iocb64;
626 long ret;
627
628 if (unlikely(nr < 0))
629 return -EINVAL;
630
631 if (nr > MAX_AIO_SUBMITS)
632 nr = MAX_AIO_SUBMITS;
633
634 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
635 ret = copy_iocb(nr, iocb, iocb64);
636 if (!ret)
637 ret = do_io_submit(ctx_id, nr, iocb64, 1);
638 return ret;
639 }
640
641 struct compat_ncp_mount_data {
642 compat_int_t version;
643 compat_uint_t ncp_fd;
644 __compat_uid_t mounted_uid;
645 compat_pid_t wdog_pid;
646 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
647 compat_uint_t time_out;
648 compat_uint_t retry_count;
649 compat_uint_t flags;
650 __compat_uid_t uid;
651 __compat_gid_t gid;
652 compat_mode_t file_mode;
653 compat_mode_t dir_mode;
654 };
655
656 struct compat_ncp_mount_data_v4 {
657 compat_int_t version;
658 compat_ulong_t flags;
659 compat_ulong_t mounted_uid;
660 compat_long_t wdog_pid;
661 compat_uint_t ncp_fd;
662 compat_uint_t time_out;
663 compat_uint_t retry_count;
664 compat_ulong_t uid;
665 compat_ulong_t gid;
666 compat_ulong_t file_mode;
667 compat_ulong_t dir_mode;
668 };
669
670 static void *do_ncp_super_data_conv(void *raw_data)
671 {
672 int version = *(unsigned int *)raw_data;
673
674 if (version == 3) {
675 struct compat_ncp_mount_data *c_n = raw_data;
676 struct ncp_mount_data *n = raw_data;
677
678 n->dir_mode = c_n->dir_mode;
679 n->file_mode = c_n->file_mode;
680 n->gid = c_n->gid;
681 n->uid = c_n->uid;
682 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
683 n->wdog_pid = c_n->wdog_pid;
684 n->mounted_uid = c_n->mounted_uid;
685 } else if (version == 4) {
686 struct compat_ncp_mount_data_v4 *c_n = raw_data;
687 struct ncp_mount_data_v4 *n = raw_data;
688
689 n->dir_mode = c_n->dir_mode;
690 n->file_mode = c_n->file_mode;
691 n->gid = c_n->gid;
692 n->uid = c_n->uid;
693 n->retry_count = c_n->retry_count;
694 n->time_out = c_n->time_out;
695 n->ncp_fd = c_n->ncp_fd;
696 n->wdog_pid = c_n->wdog_pid;
697 n->mounted_uid = c_n->mounted_uid;
698 n->flags = c_n->flags;
699 } else if (version != 5) {
700 return NULL;
701 }
702
703 return raw_data;
704 }
705
706
707 struct compat_nfs_string {
708 compat_uint_t len;
709 compat_uptr_t data;
710 };
711
712 static inline void compat_nfs_string(struct nfs_string *dst,
713 struct compat_nfs_string *src)
714 {
715 dst->data = compat_ptr(src->data);
716 dst->len = src->len;
717 }
718
719 struct compat_nfs4_mount_data_v1 {
720 compat_int_t version;
721 compat_int_t flags;
722 compat_int_t rsize;
723 compat_int_t wsize;
724 compat_int_t timeo;
725 compat_int_t retrans;
726 compat_int_t acregmin;
727 compat_int_t acregmax;
728 compat_int_t acdirmin;
729 compat_int_t acdirmax;
730 struct compat_nfs_string client_addr;
731 struct compat_nfs_string mnt_path;
732 struct compat_nfs_string hostname;
733 compat_uint_t host_addrlen;
734 compat_uptr_t host_addr;
735 compat_int_t proto;
736 compat_int_t auth_flavourlen;
737 compat_uptr_t auth_flavours;
738 };
739
740 static int do_nfs4_super_data_conv(void *raw_data)
741 {
742 int version = *(compat_uint_t *) raw_data;
743
744 if (version == 1) {
745 struct compat_nfs4_mount_data_v1 *raw = raw_data;
746 struct nfs4_mount_data *real = raw_data;
747
748 /* copy the fields backwards */
749 real->auth_flavours = compat_ptr(raw->auth_flavours);
750 real->auth_flavourlen = raw->auth_flavourlen;
751 real->proto = raw->proto;
752 real->host_addr = compat_ptr(raw->host_addr);
753 real->host_addrlen = raw->host_addrlen;
754 compat_nfs_string(&real->hostname, &raw->hostname);
755 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
756 compat_nfs_string(&real->client_addr, &raw->client_addr);
757 real->acdirmax = raw->acdirmax;
758 real->acdirmin = raw->acdirmin;
759 real->acregmax = raw->acregmax;
760 real->acregmin = raw->acregmin;
761 real->retrans = raw->retrans;
762 real->timeo = raw->timeo;
763 real->wsize = raw->wsize;
764 real->rsize = raw->rsize;
765 real->flags = raw->flags;
766 real->version = raw->version;
767 }
768
769 return 0;
770 }
771
772 #define NCPFS_NAME "ncpfs"
773 #define NFS4_NAME "nfs4"
774
775 asmlinkage long compat_sys_mount(const char __user * dev_name,
776 const char __user * dir_name,
777 const char __user * type, unsigned long flags,
778 const void __user * data)
779 {
780 char *kernel_type;
781 unsigned long data_page;
782 char *kernel_dev;
783 char *dir_page;
784 int retval;
785
786 retval = copy_mount_string(type, &kernel_type);
787 if (retval < 0)
788 goto out;
789
790 dir_page = getname(dir_name);
791 retval = PTR_ERR(dir_page);
792 if (IS_ERR(dir_page))
793 goto out1;
794
795 retval = copy_mount_string(dev_name, &kernel_dev);
796 if (retval < 0)
797 goto out2;
798
799 retval = copy_mount_options(data, &data_page);
800 if (retval < 0)
801 goto out3;
802
803 retval = -EINVAL;
804
805 if (kernel_type && data_page) {
806 if (!strcmp(kernel_type, NCPFS_NAME)) {
807 do_ncp_super_data_conv((void *)data_page);
808 } else if (!strcmp(kernel_type, NFS4_NAME)) {
809 if (do_nfs4_super_data_conv((void *) data_page))
810 goto out4;
811 }
812 }
813
814 retval = do_mount(kernel_dev, dir_page, kernel_type,
815 flags, (void*)data_page);
816
817 out4:
818 free_page(data_page);
819 out3:
820 kfree(kernel_dev);
821 out2:
822 putname(dir_page);
823 out1:
824 kfree(kernel_type);
825 out:
826 return retval;
827 }
828
829 struct compat_old_linux_dirent {
830 compat_ulong_t d_ino;
831 compat_ulong_t d_offset;
832 unsigned short d_namlen;
833 char d_name[1];
834 };
835
836 struct compat_readdir_callback {
837 struct compat_old_linux_dirent __user *dirent;
838 int result;
839 };
840
841 static int compat_fillonedir(void *__buf, const char *name, int namlen,
842 loff_t offset, u64 ino, unsigned int d_type)
843 {
844 struct compat_readdir_callback *buf = __buf;
845 struct compat_old_linux_dirent __user *dirent;
846 compat_ulong_t d_ino;
847
848 if (buf->result)
849 return -EINVAL;
850 d_ino = ino;
851 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
852 buf->result = -EOVERFLOW;
853 return -EOVERFLOW;
854 }
855 buf->result++;
856 dirent = buf->dirent;
857 if (!access_ok(VERIFY_WRITE, dirent,
858 (unsigned long)(dirent->d_name + namlen + 1) -
859 (unsigned long)dirent))
860 goto efault;
861 if ( __put_user(d_ino, &dirent->d_ino) ||
862 __put_user(offset, &dirent->d_offset) ||
863 __put_user(namlen, &dirent->d_namlen) ||
864 __copy_to_user(dirent->d_name, name, namlen) ||
865 __put_user(0, dirent->d_name + namlen))
866 goto efault;
867 return 0;
868 efault:
869 buf->result = -EFAULT;
870 return -EFAULT;
871 }
872
873 asmlinkage long compat_sys_old_readdir(unsigned int fd,
874 struct compat_old_linux_dirent __user *dirent, unsigned int count)
875 {
876 int error;
877 struct file *file;
878 struct compat_readdir_callback buf;
879
880 error = -EBADF;
881 file = fget(fd);
882 if (!file)
883 goto out;
884
885 buf.result = 0;
886 buf.dirent = dirent;
887
888 error = vfs_readdir(file, compat_fillonedir, &buf);
889 if (buf.result)
890 error = buf.result;
891
892 fput(file);
893 out:
894 return error;
895 }
896
897 struct compat_linux_dirent {
898 compat_ulong_t d_ino;
899 compat_ulong_t d_off;
900 unsigned short d_reclen;
901 char d_name[1];
902 };
903
904 struct compat_getdents_callback {
905 struct compat_linux_dirent __user *current_dir;
906 struct compat_linux_dirent __user *previous;
907 int count;
908 int error;
909 };
910
911 static int compat_filldir(void *__buf, const char *name, int namlen,
912 loff_t offset, u64 ino, unsigned int d_type)
913 {
914 struct compat_linux_dirent __user * dirent;
915 struct compat_getdents_callback *buf = __buf;
916 compat_ulong_t d_ino;
917 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
918 namlen + 2, sizeof(compat_long_t));
919
920 buf->error = -EINVAL; /* only used if we fail.. */
921 if (reclen > buf->count)
922 return -EINVAL;
923 d_ino = ino;
924 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
925 buf->error = -EOVERFLOW;
926 return -EOVERFLOW;
927 }
928 dirent = buf->previous;
929 if (dirent) {
930 if (__put_user(offset, &dirent->d_off))
931 goto efault;
932 }
933 dirent = buf->current_dir;
934 if (__put_user(d_ino, &dirent->d_ino))
935 goto efault;
936 if (__put_user(reclen, &dirent->d_reclen))
937 goto efault;
938 if (copy_to_user(dirent->d_name, name, namlen))
939 goto efault;
940 if (__put_user(0, dirent->d_name + namlen))
941 goto efault;
942 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
943 goto efault;
944 buf->previous = dirent;
945 dirent = (void __user *)dirent + reclen;
946 buf->current_dir = dirent;
947 buf->count -= reclen;
948 return 0;
949 efault:
950 buf->error = -EFAULT;
951 return -EFAULT;
952 }
953
954 asmlinkage long compat_sys_getdents(unsigned int fd,
955 struct compat_linux_dirent __user *dirent, unsigned int count)
956 {
957 struct file * file;
958 struct compat_linux_dirent __user * lastdirent;
959 struct compat_getdents_callback buf;
960 int error;
961
962 error = -EFAULT;
963 if (!access_ok(VERIFY_WRITE, dirent, count))
964 goto out;
965
966 error = -EBADF;
967 file = fget(fd);
968 if (!file)
969 goto out;
970
971 buf.current_dir = dirent;
972 buf.previous = NULL;
973 buf.count = count;
974 buf.error = 0;
975
976 error = vfs_readdir(file, compat_filldir, &buf);
977 if (error >= 0)
978 error = buf.error;
979 lastdirent = buf.previous;
980 if (lastdirent) {
981 if (put_user(file->f_pos, &lastdirent->d_off))
982 error = -EFAULT;
983 else
984 error = count - buf.count;
985 }
986 fput(file);
987 out:
988 return error;
989 }
990
991 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
992
993 struct compat_getdents_callback64 {
994 struct linux_dirent64 __user *current_dir;
995 struct linux_dirent64 __user *previous;
996 int count;
997 int error;
998 };
999
1000 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1001 u64 ino, unsigned int d_type)
1002 {
1003 struct linux_dirent64 __user *dirent;
1004 struct compat_getdents_callback64 *buf = __buf;
1005 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1006 sizeof(u64));
1007 u64 off;
1008
1009 buf->error = -EINVAL; /* only used if we fail.. */
1010 if (reclen > buf->count)
1011 return -EINVAL;
1012 dirent = buf->previous;
1013
1014 if (dirent) {
1015 if (__put_user_unaligned(offset, &dirent->d_off))
1016 goto efault;
1017 }
1018 dirent = buf->current_dir;
1019 if (__put_user_unaligned(ino, &dirent->d_ino))
1020 goto efault;
1021 off = 0;
1022 if (__put_user_unaligned(off, &dirent->d_off))
1023 goto efault;
1024 if (__put_user(reclen, &dirent->d_reclen))
1025 goto efault;
1026 if (__put_user(d_type, &dirent->d_type))
1027 goto efault;
1028 if (copy_to_user(dirent->d_name, name, namlen))
1029 goto efault;
1030 if (__put_user(0, dirent->d_name + namlen))
1031 goto efault;
1032 buf->previous = dirent;
1033 dirent = (void __user *)dirent + reclen;
1034 buf->current_dir = dirent;
1035 buf->count -= reclen;
1036 return 0;
1037 efault:
1038 buf->error = -EFAULT;
1039 return -EFAULT;
1040 }
1041
1042 asmlinkage long compat_sys_getdents64(unsigned int fd,
1043 struct linux_dirent64 __user * dirent, unsigned int count)
1044 {
1045 struct file * file;
1046 struct linux_dirent64 __user * lastdirent;
1047 struct compat_getdents_callback64 buf;
1048 int error;
1049
1050 error = -EFAULT;
1051 if (!access_ok(VERIFY_WRITE, dirent, count))
1052 goto out;
1053
1054 error = -EBADF;
1055 file = fget(fd);
1056 if (!file)
1057 goto out;
1058
1059 buf.current_dir = dirent;
1060 buf.previous = NULL;
1061 buf.count = count;
1062 buf.error = 0;
1063
1064 error = vfs_readdir(file, compat_filldir64, &buf);
1065 if (error >= 0)
1066 error = buf.error;
1067 lastdirent = buf.previous;
1068 if (lastdirent) {
1069 typeof(lastdirent->d_off) d_off = file->f_pos;
1070 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1071 error = -EFAULT;
1072 else
1073 error = count - buf.count;
1074 }
1075 fput(file);
1076 out:
1077 return error;
1078 }
1079 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1080
1081 static ssize_t compat_do_readv_writev(int type, struct file *file,
1082 const struct compat_iovec __user *uvector,
1083 unsigned long nr_segs, loff_t *pos)
1084 {
1085 compat_ssize_t tot_len;
1086 struct iovec iovstack[UIO_FASTIOV];
1087 struct iovec *iov = iovstack;
1088 ssize_t ret;
1089 io_fn_t fn;
1090 iov_fn_t fnv;
1091
1092 ret = -EINVAL;
1093 if (!file->f_op)
1094 goto out;
1095
1096 ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1097 UIO_FASTIOV, iovstack, &iov, 1);
1098 if (ret <= 0)
1099 goto out;
1100
1101 tot_len = ret;
1102 ret = rw_verify_area(type, file, pos, tot_len);
1103 if (ret < 0)
1104 goto out;
1105
1106 fnv = NULL;
1107 if (type == READ) {
1108 fn = file->f_op->read;
1109 fnv = file->f_op->aio_read;
1110 } else {
1111 fn = (io_fn_t)file->f_op->write;
1112 fnv = file->f_op->aio_write;
1113 }
1114
1115 if (fnv)
1116 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1117 pos, fnv);
1118 else
1119 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1120
1121 out:
1122 if (iov != iovstack)
1123 kfree(iov);
1124 if ((ret + (type == READ)) > 0) {
1125 if (type == READ)
1126 fsnotify_access(file);
1127 else
1128 fsnotify_modify(file);
1129 }
1130 return ret;
1131 }
1132
1133 static size_t compat_readv(struct file *file,
1134 const struct compat_iovec __user *vec,
1135 unsigned long vlen, loff_t *pos)
1136 {
1137 ssize_t ret = -EBADF;
1138
1139 if (!(file->f_mode & FMODE_READ))
1140 goto out;
1141
1142 ret = -EINVAL;
1143 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1144 goto out;
1145
1146 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1147
1148 out:
1149 if (ret > 0)
1150 add_rchar(current, ret);
1151 inc_syscr(current);
1152 return ret;
1153 }
1154
1155 asmlinkage ssize_t
1156 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1157 unsigned long vlen)
1158 {
1159 struct file *file;
1160 int fput_needed;
1161 ssize_t ret;
1162 loff_t pos;
1163
1164 file = fget_light(fd, &fput_needed);
1165 if (!file)
1166 return -EBADF;
1167 pos = file->f_pos;
1168 ret = compat_readv(file, vec, vlen, &pos);
1169 file->f_pos = pos;
1170 fput_light(file, fput_needed);
1171 return ret;
1172 }
1173
1174 asmlinkage ssize_t
1175 compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
1176 unsigned long vlen, loff_t pos)
1177 {
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 asmlinkage ssize_t
1195 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1196 unsigned long vlen, u32 pos_low, u32 pos_high)
1197 {
1198 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1199 return compat_sys_preadv64(fd, vec, vlen, pos);
1200 }
1201
1202 static size_t compat_writev(struct file *file,
1203 const struct compat_iovec __user *vec,
1204 unsigned long vlen, loff_t *pos)
1205 {
1206 ssize_t ret = -EBADF;
1207
1208 if (!(file->f_mode & FMODE_WRITE))
1209 goto out;
1210
1211 ret = -EINVAL;
1212 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1213 goto out;
1214
1215 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1216
1217 out:
1218 if (ret > 0)
1219 add_wchar(current, ret);
1220 inc_syscw(current);
1221 return ret;
1222 }
1223
1224 asmlinkage ssize_t
1225 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1226 unsigned long vlen)
1227 {
1228 struct file *file;
1229 int fput_needed;
1230 ssize_t ret;
1231 loff_t pos;
1232
1233 file = fget_light(fd, &fput_needed);
1234 if (!file)
1235 return -EBADF;
1236 pos = file->f_pos;
1237 ret = compat_writev(file, vec, vlen, &pos);
1238 file->f_pos = pos;
1239 fput_light(file, fput_needed);
1240 return ret;
1241 }
1242
1243 asmlinkage ssize_t
1244 compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
1245 unsigned long vlen, loff_t pos)
1246 {
1247 struct file *file;
1248 int fput_needed;
1249 ssize_t ret;
1250
1251 if (pos < 0)
1252 return -EINVAL;
1253 file = fget_light(fd, &fput_needed);
1254 if (!file)
1255 return -EBADF;
1256 ret = -ESPIPE;
1257 if (file->f_mode & FMODE_PWRITE)
1258 ret = compat_writev(file, vec, vlen, &pos);
1259 fput_light(file, fput_needed);
1260 return ret;
1261 }
1262
1263 asmlinkage ssize_t
1264 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1265 unsigned long vlen, u32 pos_low, u32 pos_high)
1266 {
1267 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1268 return compat_sys_pwritev64(fd, vec, vlen, pos);
1269 }
1270
1271 asmlinkage long
1272 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1273 unsigned int nr_segs, unsigned int flags)
1274 {
1275 unsigned i;
1276 struct iovec __user *iov;
1277 if (nr_segs > UIO_MAXIOV)
1278 return -EINVAL;
1279 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1280 for (i = 0; i < nr_segs; i++) {
1281 struct compat_iovec v;
1282 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1283 get_user(v.iov_len, &iov32[i].iov_len) ||
1284 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1285 put_user(v.iov_len, &iov[i].iov_len))
1286 return -EFAULT;
1287 }
1288 return sys_vmsplice(fd, iov, nr_segs, flags);
1289 }
1290
1291 /*
1292 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1293 * O_LARGEFILE flag.
1294 */
1295 asmlinkage long
1296 compat_sys_open(const char __user *filename, int flags, umode_t mode)
1297 {
1298 return do_sys_open(AT_FDCWD, filename, flags, mode);
1299 }
1300
1301 /*
1302 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1303 * O_LARGEFILE flag.
1304 */
1305 asmlinkage long
1306 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
1307 {
1308 return do_sys_open(dfd, filename, flags, mode);
1309 }
1310
1311 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1312
1313 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1314 int timeval, int ret)
1315 {
1316 struct timespec ts;
1317
1318 if (!p)
1319 return ret;
1320
1321 if (current->personality & STICKY_TIMEOUTS)
1322 goto sticky;
1323
1324 /* No update for zero timeout */
1325 if (!end_time->tv_sec && !end_time->tv_nsec)
1326 return ret;
1327
1328 ktime_get_ts(&ts);
1329 ts = timespec_sub(*end_time, ts);
1330 if (ts.tv_sec < 0)
1331 ts.tv_sec = ts.tv_nsec = 0;
1332
1333 if (timeval) {
1334 struct compat_timeval rtv;
1335
1336 rtv.tv_sec = ts.tv_sec;
1337 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1338
1339 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1340 return ret;
1341 } else {
1342 struct compat_timespec rts;
1343
1344 rts.tv_sec = ts.tv_sec;
1345 rts.tv_nsec = ts.tv_nsec;
1346
1347 if (!copy_to_user(p, &rts, sizeof(rts)))
1348 return ret;
1349 }
1350 /*
1351 * If an application puts its timeval in read-only memory, we
1352 * don't want the Linux-specific update to the timeval to
1353 * cause a fault after the select has completed
1354 * successfully. However, because we're not updating the
1355 * timeval, we can't restart the system call.
1356 */
1357
1358 sticky:
1359 if (ret == -ERESTARTNOHAND)
1360 ret = -EINTR;
1361 return ret;
1362 }
1363
1364 /*
1365 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1366 * 64-bit unsigned longs.
1367 */
1368 static
1369 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1370 unsigned long *fdset)
1371 {
1372 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1373 if (ufdset) {
1374 unsigned long odd;
1375
1376 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1377 return -EFAULT;
1378
1379 odd = nr & 1UL;
1380 nr &= ~1UL;
1381 while (nr) {
1382 unsigned long h, l;
1383 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1384 return -EFAULT;
1385 ufdset += 2;
1386 *fdset++ = h << 32 | l;
1387 nr -= 2;
1388 }
1389 if (odd && __get_user(*fdset, ufdset))
1390 return -EFAULT;
1391 } else {
1392 /* Tricky, must clear full unsigned long in the
1393 * kernel fdset at the end, this makes sure that
1394 * actually happens.
1395 */
1396 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1397 }
1398 return 0;
1399 }
1400
1401 static
1402 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1403 unsigned long *fdset)
1404 {
1405 unsigned long odd;
1406 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1407
1408 if (!ufdset)
1409 return 0;
1410
1411 odd = nr & 1UL;
1412 nr &= ~1UL;
1413 while (nr) {
1414 unsigned long h, l;
1415 l = *fdset++;
1416 h = l >> 32;
1417 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1418 return -EFAULT;
1419 ufdset += 2;
1420 nr -= 2;
1421 }
1422 if (odd && __put_user(*fdset, ufdset))
1423 return -EFAULT;
1424 return 0;
1425 }
1426
1427
1428 /*
1429 * This is a virtual copy of sys_select from fs/select.c and probably
1430 * should be compared to it from time to time
1431 */
1432
1433 /*
1434 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1435 * like to be certain this leads to no problems. So I return
1436 * EINTR just for safety.
1437 *
1438 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1439 * I'm trying ERESTARTNOHAND which restart only when you want to.
1440 */
1441 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1442 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1443 struct timespec *end_time)
1444 {
1445 fd_set_bits fds;
1446 void *bits;
1447 int size, max_fds, ret = -EINVAL;
1448 struct fdtable *fdt;
1449 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1450
1451 if (n < 0)
1452 goto out_nofds;
1453
1454 /* max_fds can increase, so grab it once to avoid race */
1455 rcu_read_lock();
1456 fdt = files_fdtable(current->files);
1457 max_fds = fdt->max_fds;
1458 rcu_read_unlock();
1459 if (n > max_fds)
1460 n = max_fds;
1461
1462 /*
1463 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1464 * since we used fdset we need to allocate memory in units of
1465 * long-words.
1466 */
1467 size = FDS_BYTES(n);
1468 bits = stack_fds;
1469 if (size > sizeof(stack_fds) / 6) {
1470 bits = kmalloc(6 * size, GFP_KERNEL);
1471 ret = -ENOMEM;
1472 if (!bits)
1473 goto out_nofds;
1474 }
1475 fds.in = (unsigned long *) bits;
1476 fds.out = (unsigned long *) (bits + size);
1477 fds.ex = (unsigned long *) (bits + 2*size);
1478 fds.res_in = (unsigned long *) (bits + 3*size);
1479 fds.res_out = (unsigned long *) (bits + 4*size);
1480 fds.res_ex = (unsigned long *) (bits + 5*size);
1481
1482 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1483 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1484 (ret = compat_get_fd_set(n, exp, fds.ex)))
1485 goto out;
1486 zero_fd_set(n, fds.res_in);
1487 zero_fd_set(n, fds.res_out);
1488 zero_fd_set(n, fds.res_ex);
1489
1490 ret = do_select(n, &fds, end_time);
1491
1492 if (ret < 0)
1493 goto out;
1494 if (!ret) {
1495 ret = -ERESTARTNOHAND;
1496 if (signal_pending(current))
1497 goto out;
1498 ret = 0;
1499 }
1500
1501 if (compat_set_fd_set(n, inp, fds.res_in) ||
1502 compat_set_fd_set(n, outp, fds.res_out) ||
1503 compat_set_fd_set(n, exp, fds.res_ex))
1504 ret = -EFAULT;
1505 out:
1506 if (bits != stack_fds)
1507 kfree(bits);
1508 out_nofds:
1509 return ret;
1510 }
1511
1512 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1513 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1514 struct compat_timeval __user *tvp)
1515 {
1516 struct timespec end_time, *to = NULL;
1517 struct compat_timeval tv;
1518 int ret;
1519
1520 if (tvp) {
1521 if (copy_from_user(&tv, tvp, sizeof(tv)))
1522 return -EFAULT;
1523
1524 to = &end_time;
1525 if (poll_select_set_timeout(to,
1526 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1527 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1528 return -EINVAL;
1529 }
1530
1531 ret = compat_core_sys_select(n, inp, outp, exp, to);
1532 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1533
1534 return ret;
1535 }
1536
1537 struct compat_sel_arg_struct {
1538 compat_ulong_t n;
1539 compat_uptr_t inp;
1540 compat_uptr_t outp;
1541 compat_uptr_t exp;
1542 compat_uptr_t tvp;
1543 };
1544
1545 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1546 {
1547 struct compat_sel_arg_struct a;
1548
1549 if (copy_from_user(&a, arg, sizeof(a)))
1550 return -EFAULT;
1551 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1552 compat_ptr(a.exp), compat_ptr(a.tvp));
1553 }
1554
1555 #ifdef HAVE_SET_RESTORE_SIGMASK
1556 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1557 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1558 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1559 compat_size_t sigsetsize)
1560 {
1561 compat_sigset_t ss32;
1562 sigset_t ksigmask, sigsaved;
1563 struct compat_timespec ts;
1564 struct timespec end_time, *to = NULL;
1565 int ret;
1566
1567 if (tsp) {
1568 if (copy_from_user(&ts, tsp, sizeof(ts)))
1569 return -EFAULT;
1570
1571 to = &end_time;
1572 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1573 return -EINVAL;
1574 }
1575
1576 if (sigmask) {
1577 if (sigsetsize != sizeof(compat_sigset_t))
1578 return -EINVAL;
1579 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1580 return -EFAULT;
1581 sigset_from_compat(&ksigmask, &ss32);
1582
1583 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1584 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1585 }
1586
1587 ret = compat_core_sys_select(n, inp, outp, exp, to);
1588 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1589
1590 if (ret == -ERESTARTNOHAND) {
1591 /*
1592 * Don't restore the signal mask yet. Let do_signal() deliver
1593 * the signal on the way back to userspace, before the signal
1594 * mask is restored.
1595 */
1596 if (sigmask) {
1597 memcpy(&current->saved_sigmask, &sigsaved,
1598 sizeof(sigsaved));
1599 set_restore_sigmask();
1600 }
1601 } else if (sigmask)
1602 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1603
1604 return ret;
1605 }
1606
1607 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1608 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1609 struct compat_timespec __user *tsp, void __user *sig)
1610 {
1611 compat_size_t sigsetsize = 0;
1612 compat_uptr_t up = 0;
1613
1614 if (sig) {
1615 if (!access_ok(VERIFY_READ, sig,
1616 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1617 __get_user(up, (compat_uptr_t __user *)sig) ||
1618 __get_user(sigsetsize,
1619 (compat_size_t __user *)(sig+sizeof(up))))
1620 return -EFAULT;
1621 }
1622 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1623 sigsetsize);
1624 }
1625
1626 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1627 unsigned int nfds, struct compat_timespec __user *tsp,
1628 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1629 {
1630 compat_sigset_t ss32;
1631 sigset_t ksigmask, sigsaved;
1632 struct compat_timespec ts;
1633 struct timespec end_time, *to = NULL;
1634 int ret;
1635
1636 if (tsp) {
1637 if (copy_from_user(&ts, tsp, sizeof(ts)))
1638 return -EFAULT;
1639
1640 to = &end_time;
1641 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1642 return -EINVAL;
1643 }
1644
1645 if (sigmask) {
1646 if (sigsetsize != sizeof(compat_sigset_t))
1647 return -EINVAL;
1648 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1649 return -EFAULT;
1650 sigset_from_compat(&ksigmask, &ss32);
1651
1652 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1653 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1654 }
1655
1656 ret = do_sys_poll(ufds, nfds, to);
1657
1658 /* We can restart this syscall, usually */
1659 if (ret == -EINTR) {
1660 /*
1661 * Don't restore the signal mask yet. Let do_signal() deliver
1662 * the signal on the way back to userspace, before the signal
1663 * mask is restored.
1664 */
1665 if (sigmask) {
1666 memcpy(&current->saved_sigmask, &sigsaved,
1667 sizeof(sigsaved));
1668 set_restore_sigmask();
1669 }
1670 ret = -ERESTARTNOHAND;
1671 } else if (sigmask)
1672 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1673
1674 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1675
1676 return ret;
1677 }
1678 #endif /* HAVE_SET_RESTORE_SIGMASK */
1679
1680 #ifdef CONFIG_EPOLL
1681
1682 #ifdef HAVE_SET_RESTORE_SIGMASK
1683 asmlinkage long compat_sys_epoll_pwait(int epfd,
1684 struct compat_epoll_event __user *events,
1685 int maxevents, int timeout,
1686 const compat_sigset_t __user *sigmask,
1687 compat_size_t sigsetsize)
1688 {
1689 long err;
1690 compat_sigset_t csigmask;
1691 sigset_t ksigmask, sigsaved;
1692
1693 /*
1694 * If the caller wants a certain signal mask to be set during the wait,
1695 * we apply it here.
1696 */
1697 if (sigmask) {
1698 if (sigsetsize != sizeof(compat_sigset_t))
1699 return -EINVAL;
1700 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1701 return -EFAULT;
1702 sigset_from_compat(&ksigmask, &csigmask);
1703 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1704 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1705 }
1706
1707 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1708
1709 /*
1710 * If we changed the signal mask, we need to restore the original one.
1711 * In case we've got a signal while waiting, we do not restore the
1712 * signal mask yet, and we allow do_signal() to deliver the signal on
1713 * the way back to userspace, before the signal mask is restored.
1714 */
1715 if (sigmask) {
1716 if (err == -EINTR) {
1717 memcpy(&current->saved_sigmask, &sigsaved,
1718 sizeof(sigsaved));
1719 set_restore_sigmask();
1720 } else
1721 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1722 }
1723
1724 return err;
1725 }
1726 #endif /* HAVE_SET_RESTORE_SIGMASK */
1727
1728 #endif /* CONFIG_EPOLL */
1729
1730 #ifdef CONFIG_SIGNALFD
1731
1732 asmlinkage long compat_sys_signalfd4(int ufd,
1733 const compat_sigset_t __user *sigmask,
1734 compat_size_t sigsetsize, int flags)
1735 {
1736 compat_sigset_t ss32;
1737 sigset_t tmp;
1738 sigset_t __user *ksigmask;
1739
1740 if (sigsetsize != sizeof(compat_sigset_t))
1741 return -EINVAL;
1742 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1743 return -EFAULT;
1744 sigset_from_compat(&tmp, &ss32);
1745 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1746 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1747 return -EFAULT;
1748
1749 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1750 }
1751
1752 asmlinkage long compat_sys_signalfd(int ufd,
1753 const compat_sigset_t __user *sigmask,
1754 compat_size_t sigsetsize)
1755 {
1756 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1757 }
1758 #endif /* CONFIG_SIGNALFD */
1759
1760 #ifdef CONFIG_TIMERFD
1761
1762 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1763 const struct compat_itimerspec __user *utmr,
1764 struct compat_itimerspec __user *otmr)
1765 {
1766 int error;
1767 struct itimerspec t;
1768 struct itimerspec __user *ut;
1769
1770 if (get_compat_itimerspec(&t, utmr))
1771 return -EFAULT;
1772 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1773 if (copy_to_user(&ut[0], &t, sizeof(t)))
1774 return -EFAULT;
1775 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1776 if (!error && otmr)
1777 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1778 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1779
1780 return error;
1781 }
1782
1783 asmlinkage long compat_sys_timerfd_gettime(int ufd,
1784 struct compat_itimerspec __user *otmr)
1785 {
1786 int error;
1787 struct itimerspec t;
1788 struct itimerspec __user *ut;
1789
1790 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1791 error = sys_timerfd_gettime(ufd, ut);
1792 if (!error)
1793 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1794 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1795
1796 return error;
1797 }
1798
1799 #endif /* CONFIG_TIMERFD */
1800
1801 #ifdef CONFIG_FHANDLE
1802 /*
1803 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1804 * doesn't set the O_LARGEFILE flag.
1805 */
1806 asmlinkage long
1807 compat_sys_open_by_handle_at(int mountdirfd,
1808 struct file_handle __user *handle, int flags)
1809 {
1810 return do_handle_open(mountdirfd, handle, flags);
1811 }
1812 #endif
Linux with added FPC-III support