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aoe: reserve enough headroom on skbs
[linux/fpc-iii.git] / fs / compat.c
blobd487985dd0ead4261079ff4157d7245d2ea6e2bb
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, from_kuid_munged(current_user_ns(), stat->uid));
148 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), 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)
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 (type >= 0 &&
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 struct filename *dir;
784 int retval;
785
786 retval = copy_mount_string(type, &kernel_type);
787 if (retval < 0)
788 goto out;
789
790 dir = getname(dir_name);
791 retval = PTR_ERR(dir);
792 if (IS_ERR(dir))
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->name, 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);
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 fd f = fdget(fd);
878 struct compat_readdir_callback buf;
879
880 if (!f.file)
881 return -EBADF;
882
883 buf.result = 0;
884 buf.dirent = dirent;
885
886 error = vfs_readdir(f.file, compat_fillonedir, &buf);
887 if (buf.result)
888 error = buf.result;
889
890 fdput(f);
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 fd f;
955 struct compat_linux_dirent __user * lastdirent;
956 struct compat_getdents_callback buf;
957 int error;
958
959 if (!access_ok(VERIFY_WRITE, dirent, count))
960 return -EFAULT;
961
962 f = fdget(fd);
963 if (!f.file)
964 return -EBADF;
965
966 buf.current_dir = dirent;
967 buf.previous = NULL;
968 buf.count = count;
969 buf.error = 0;
970
971 error = vfs_readdir(f.file, compat_filldir, &buf);
972 if (error >= 0)
973 error = buf.error;
974 lastdirent = buf.previous;
975 if (lastdirent) {
976 if (put_user(f.file->f_pos, &lastdirent->d_off))
977 error = -EFAULT;
978 else
979 error = count - buf.count;
980 }
981 fdput(f);
982 return error;
983 }
984
985 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
986
987 struct compat_getdents_callback64 {
988 struct linux_dirent64 __user *current_dir;
989 struct linux_dirent64 __user *previous;
990 int count;
991 int error;
992 };
993
994 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
995 u64 ino, unsigned int d_type)
996 {
997 struct linux_dirent64 __user *dirent;
998 struct compat_getdents_callback64 *buf = __buf;
999 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1000 sizeof(u64));
1001 u64 off;
1002
1003 buf->error = -EINVAL; /* only used if we fail.. */
1004 if (reclen > buf->count)
1005 return -EINVAL;
1006 dirent = buf->previous;
1007
1008 if (dirent) {
1009 if (__put_user_unaligned(offset, &dirent->d_off))
1010 goto efault;
1011 }
1012 dirent = buf->current_dir;
1013 if (__put_user_unaligned(ino, &dirent->d_ino))
1014 goto efault;
1015 off = 0;
1016 if (__put_user_unaligned(off, &dirent->d_off))
1017 goto efault;
1018 if (__put_user(reclen, &dirent->d_reclen))
1019 goto efault;
1020 if (__put_user(d_type, &dirent->d_type))
1021 goto efault;
1022 if (copy_to_user(dirent->d_name, name, namlen))
1023 goto efault;
1024 if (__put_user(0, dirent->d_name + namlen))
1025 goto efault;
1026 buf->previous = dirent;
1027 dirent = (void __user *)dirent + reclen;
1028 buf->current_dir = dirent;
1029 buf->count -= reclen;
1030 return 0;
1031 efault:
1032 buf->error = -EFAULT;
1033 return -EFAULT;
1034 }
1035
1036 asmlinkage long compat_sys_getdents64(unsigned int fd,
1037 struct linux_dirent64 __user * dirent, unsigned int count)
1038 {
1039 struct fd f;
1040 struct linux_dirent64 __user * lastdirent;
1041 struct compat_getdents_callback64 buf;
1042 int error;
1043
1044 if (!access_ok(VERIFY_WRITE, dirent, count))
1045 return -EFAULT;
1046
1047 f = fdget(fd);
1048 if (!f.file)
1049 return -EBADF;
1050
1051 buf.current_dir = dirent;
1052 buf.previous = NULL;
1053 buf.count = count;
1054 buf.error = 0;
1055
1056 error = vfs_readdir(f.file, compat_filldir64, &buf);
1057 if (error >= 0)
1058 error = buf.error;
1059 lastdirent = buf.previous;
1060 if (lastdirent) {
1061 typeof(lastdirent->d_off) d_off = f.file->f_pos;
1062 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1063 error = -EFAULT;
1064 else
1065 error = count - buf.count;
1066 }
1067 fdput(f);
1068 return error;
1069 }
1070 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1071
1072 static ssize_t compat_do_readv_writev(int type, struct file *file,
1073 const struct compat_iovec __user *uvector,
1074 unsigned long nr_segs, loff_t *pos)
1075 {
1076 compat_ssize_t tot_len;
1077 struct iovec iovstack[UIO_FASTIOV];
1078 struct iovec *iov = iovstack;
1079 ssize_t ret;
1080 io_fn_t fn;
1081 iov_fn_t fnv;
1082
1083 ret = -EINVAL;
1084 if (!file->f_op)
1085 goto out;
1086
1087 ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1088 UIO_FASTIOV, iovstack, &iov);
1089 if (ret <= 0)
1090 goto out;
1091
1092 tot_len = ret;
1093 ret = rw_verify_area(type, file, pos, tot_len);
1094 if (ret < 0)
1095 goto out;
1096
1097 fnv = NULL;
1098 if (type == READ) {
1099 fn = file->f_op->read;
1100 fnv = file->f_op->aio_read;
1101 } else {
1102 fn = (io_fn_t)file->f_op->write;
1103 fnv = file->f_op->aio_write;
1104 }
1105
1106 if (fnv)
1107 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1108 pos, fnv);
1109 else
1110 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1111
1112 out:
1113 if (iov != iovstack)
1114 kfree(iov);
1115 if ((ret + (type == READ)) > 0) {
1116 if (type == READ)
1117 fsnotify_access(file);
1118 else
1119 fsnotify_modify(file);
1120 }
1121 return ret;
1122 }
1123
1124 static size_t compat_readv(struct file *file,
1125 const struct compat_iovec __user *vec,
1126 unsigned long vlen, loff_t *pos)
1127 {
1128 ssize_t ret = -EBADF;
1129
1130 if (!(file->f_mode & FMODE_READ))
1131 goto out;
1132
1133 ret = -EINVAL;
1134 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1135 goto out;
1136
1137 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1138
1139 out:
1140 if (ret > 0)
1141 add_rchar(current, ret);
1142 inc_syscr(current);
1143 return ret;
1144 }
1145
1146 asmlinkage ssize_t
1147 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1148 unsigned long vlen)
1149 {
1150 struct fd f = fdget(fd);
1151 ssize_t ret;
1152 loff_t pos;
1153
1154 if (!f.file)
1155 return -EBADF;
1156 pos = f.file->f_pos;
1157 ret = compat_readv(f.file, vec, vlen, &pos);
1158 f.file->f_pos = pos;
1159 fdput(f);
1160 return ret;
1161 }
1162
1163 asmlinkage ssize_t
1164 compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
1165 unsigned long vlen, loff_t pos)
1166 {
1167 struct fd f;
1168 ssize_t ret;
1169
1170 if (pos < 0)
1171 return -EINVAL;
1172 f = fdget(fd);
1173 if (!f.file)
1174 return -EBADF;
1175 ret = -ESPIPE;
1176 if (f.file->f_mode & FMODE_PREAD)
1177 ret = compat_readv(f.file, vec, vlen, &pos);
1178 fdput(f);
1179 return ret;
1180 }
1181
1182 asmlinkage ssize_t
1183 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1184 unsigned long vlen, u32 pos_low, u32 pos_high)
1185 {
1186 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1187 return compat_sys_preadv64(fd, vec, vlen, pos);
1188 }
1189
1190 static size_t compat_writev(struct file *file,
1191 const struct compat_iovec __user *vec,
1192 unsigned long vlen, loff_t *pos)
1193 {
1194 ssize_t ret = -EBADF;
1195
1196 if (!(file->f_mode & FMODE_WRITE))
1197 goto out;
1198
1199 ret = -EINVAL;
1200 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1201 goto out;
1202
1203 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1204
1205 out:
1206 if (ret > 0)
1207 add_wchar(current, ret);
1208 inc_syscw(current);
1209 return ret;
1210 }
1211
1212 asmlinkage ssize_t
1213 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1214 unsigned long vlen)
1215 {
1216 struct fd f = fdget(fd);
1217 ssize_t ret;
1218 loff_t pos;
1219
1220 if (!f.file)
1221 return -EBADF;
1222 pos = f.file->f_pos;
1223 ret = compat_writev(f.file, vec, vlen, &pos);
1224 f.file->f_pos = pos;
1225 fdput(f);
1226 return ret;
1227 }
1228
1229 asmlinkage ssize_t
1230 compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
1231 unsigned long vlen, loff_t pos)
1232 {
1233 struct fd f;
1234 ssize_t ret;
1235
1236 if (pos < 0)
1237 return -EINVAL;
1238 f = fdget(fd);
1239 if (!f.file)
1240 return -EBADF;
1241 ret = -ESPIPE;
1242 if (f.file->f_mode & FMODE_PWRITE)
1243 ret = compat_writev(f.file, vec, vlen, &pos);
1244 fdput(f);
1245 return ret;
1246 }
1247
1248 asmlinkage ssize_t
1249 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1250 unsigned long vlen, u32 pos_low, u32 pos_high)
1251 {
1252 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1253 return compat_sys_pwritev64(fd, vec, vlen, pos);
1254 }
1255
1256 asmlinkage long
1257 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1258 unsigned int nr_segs, unsigned int flags)
1259 {
1260 unsigned i;
1261 struct iovec __user *iov;
1262 if (nr_segs > UIO_MAXIOV)
1263 return -EINVAL;
1264 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1265 for (i = 0; i < nr_segs; i++) {
1266 struct compat_iovec v;
1267 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1268 get_user(v.iov_len, &iov32[i].iov_len) ||
1269 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1270 put_user(v.iov_len, &iov[i].iov_len))
1271 return -EFAULT;
1272 }
1273 return sys_vmsplice(fd, iov, nr_segs, flags);
1274 }
1275
1276 /*
1277 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1278 * O_LARGEFILE flag.
1279 */
1280 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1281 {
1282 return do_sys_open(AT_FDCWD, filename, flags, mode);
1283 }
1284
1285 /*
1286 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1287 * O_LARGEFILE flag.
1288 */
1289 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1290 {
1291 return do_sys_open(dfd, filename, flags, mode);
1292 }
1293
1294 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1295
1296 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1297 int timeval, int ret)
1298 {
1299 struct timespec ts;
1300
1301 if (!p)
1302 return ret;
1303
1304 if (current->personality & STICKY_TIMEOUTS)
1305 goto sticky;
1306
1307 /* No update for zero timeout */
1308 if (!end_time->tv_sec && !end_time->tv_nsec)
1309 return ret;
1310
1311 ktime_get_ts(&ts);
1312 ts = timespec_sub(*end_time, ts);
1313 if (ts.tv_sec < 0)
1314 ts.tv_sec = ts.tv_nsec = 0;
1315
1316 if (timeval) {
1317 struct compat_timeval rtv;
1318
1319 rtv.tv_sec = ts.tv_sec;
1320 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1321
1322 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1323 return ret;
1324 } else {
1325 struct compat_timespec rts;
1326
1327 rts.tv_sec = ts.tv_sec;
1328 rts.tv_nsec = ts.tv_nsec;
1329
1330 if (!copy_to_user(p, &rts, sizeof(rts)))
1331 return ret;
1332 }
1333 /*
1334 * If an application puts its timeval in read-only memory, we
1335 * don't want the Linux-specific update to the timeval to
1336 * cause a fault after the select has completed
1337 * successfully. However, because we're not updating the
1338 * timeval, we can't restart the system call.
1339 */
1340
1341 sticky:
1342 if (ret == -ERESTARTNOHAND)
1343 ret = -EINTR;
1344 return ret;
1345 }
1346
1347 /*
1348 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1349 * 64-bit unsigned longs.
1350 */
1351 static
1352 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1353 unsigned long *fdset)
1354 {
1355 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1356 if (ufdset) {
1357 unsigned long odd;
1358
1359 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1360 return -EFAULT;
1361
1362 odd = nr & 1UL;
1363 nr &= ~1UL;
1364 while (nr) {
1365 unsigned long h, l;
1366 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1367 return -EFAULT;
1368 ufdset += 2;
1369 *fdset++ = h << 32 | l;
1370 nr -= 2;
1371 }
1372 if (odd && __get_user(*fdset, ufdset))
1373 return -EFAULT;
1374 } else {
1375 /* Tricky, must clear full unsigned long in the
1376 * kernel fdset at the end, this makes sure that
1377 * actually happens.
1378 */
1379 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1380 }
1381 return 0;
1382 }
1383
1384 static
1385 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1386 unsigned long *fdset)
1387 {
1388 unsigned long odd;
1389 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1390
1391 if (!ufdset)
1392 return 0;
1393
1394 odd = nr & 1UL;
1395 nr &= ~1UL;
1396 while (nr) {
1397 unsigned long h, l;
1398 l = *fdset++;
1399 h = l >> 32;
1400 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1401 return -EFAULT;
1402 ufdset += 2;
1403 nr -= 2;
1404 }
1405 if (odd && __put_user(*fdset, ufdset))
1406 return -EFAULT;
1407 return 0;
1408 }
1409
1410
1411 /*
1412 * This is a virtual copy of sys_select from fs/select.c and probably
1413 * should be compared to it from time to time
1414 */
1415
1416 /*
1417 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1418 * like to be certain this leads to no problems. So I return
1419 * EINTR just for safety.
1420 *
1421 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1422 * I'm trying ERESTARTNOHAND which restart only when you want to.
1423 */
1424 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1425 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1426 struct timespec *end_time)
1427 {
1428 fd_set_bits fds;
1429 void *bits;
1430 int size, max_fds, ret = -EINVAL;
1431 struct fdtable *fdt;
1432 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1433
1434 if (n < 0)
1435 goto out_nofds;
1436
1437 /* max_fds can increase, so grab it once to avoid race */
1438 rcu_read_lock();
1439 fdt = files_fdtable(current->files);
1440 max_fds = fdt->max_fds;
1441 rcu_read_unlock();
1442 if (n > max_fds)
1443 n = max_fds;
1444
1445 /*
1446 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1447 * since we used fdset we need to allocate memory in units of
1448 * long-words.
1449 */
1450 size = FDS_BYTES(n);
1451 bits = stack_fds;
1452 if (size > sizeof(stack_fds) / 6) {
1453 bits = kmalloc(6 * size, GFP_KERNEL);
1454 ret = -ENOMEM;
1455 if (!bits)
1456 goto out_nofds;
1457 }
1458 fds.in = (unsigned long *) bits;
1459 fds.out = (unsigned long *) (bits + size);
1460 fds.ex = (unsigned long *) (bits + 2*size);
1461 fds.res_in = (unsigned long *) (bits + 3*size);
1462 fds.res_out = (unsigned long *) (bits + 4*size);
1463 fds.res_ex = (unsigned long *) (bits + 5*size);
1464
1465 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1466 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1467 (ret = compat_get_fd_set(n, exp, fds.ex)))
1468 goto out;
1469 zero_fd_set(n, fds.res_in);
1470 zero_fd_set(n, fds.res_out);
1471 zero_fd_set(n, fds.res_ex);
1472
1473 ret = do_select(n, &fds, end_time);
1474
1475 if (ret < 0)
1476 goto out;
1477 if (!ret) {
1478 ret = -ERESTARTNOHAND;
1479 if (signal_pending(current))
1480 goto out;
1481 ret = 0;
1482 }
1483
1484 if (compat_set_fd_set(n, inp, fds.res_in) ||
1485 compat_set_fd_set(n, outp, fds.res_out) ||
1486 compat_set_fd_set(n, exp, fds.res_ex))
1487 ret = -EFAULT;
1488 out:
1489 if (bits != stack_fds)
1490 kfree(bits);
1491 out_nofds:
1492 return ret;
1493 }
1494
1495 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1496 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1497 struct compat_timeval __user *tvp)
1498 {
1499 struct timespec end_time, *to = NULL;
1500 struct compat_timeval tv;
1501 int ret;
1502
1503 if (tvp) {
1504 if (copy_from_user(&tv, tvp, sizeof(tv)))
1505 return -EFAULT;
1506
1507 to = &end_time;
1508 if (poll_select_set_timeout(to,
1509 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1510 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1511 return -EINVAL;
1512 }
1513
1514 ret = compat_core_sys_select(n, inp, outp, exp, to);
1515 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1516
1517 return ret;
1518 }
1519
1520 struct compat_sel_arg_struct {
1521 compat_ulong_t n;
1522 compat_uptr_t inp;
1523 compat_uptr_t outp;
1524 compat_uptr_t exp;
1525 compat_uptr_t tvp;
1526 };
1527
1528 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1529 {
1530 struct compat_sel_arg_struct a;
1531
1532 if (copy_from_user(&a, arg, sizeof(a)))
1533 return -EFAULT;
1534 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1535 compat_ptr(a.exp), compat_ptr(a.tvp));
1536 }
1537
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
1661 #ifdef CONFIG_EPOLL
1662
1663 asmlinkage long compat_sys_epoll_pwait(int epfd,
1664 struct compat_epoll_event __user *events,
1665 int maxevents, int timeout,
1666 const compat_sigset_t __user *sigmask,
1667 compat_size_t sigsetsize)
1668 {
1669 long err;
1670 compat_sigset_t csigmask;
1671 sigset_t ksigmask, sigsaved;
1672
1673 /*
1674 * If the caller wants a certain signal mask to be set during the wait,
1675 * we apply it here.
1676 */
1677 if (sigmask) {
1678 if (sigsetsize != sizeof(compat_sigset_t))
1679 return -EINVAL;
1680 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1681 return -EFAULT;
1682 sigset_from_compat(&ksigmask, &csigmask);
1683 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1684 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1685 }
1686
1687 err = sys_epoll_wait(epfd, events, maxevents, timeout);
1688
1689 /*
1690 * If we changed the signal mask, we need to restore the original one.
1691 * In case we've got a signal while waiting, we do not restore the
1692 * signal mask yet, and we allow do_signal() to deliver the signal on
1693 * the way back to userspace, before the signal mask is restored.
1694 */
1695 if (sigmask) {
1696 if (err == -EINTR) {
1697 memcpy(&current->saved_sigmask, &sigsaved,
1698 sizeof(sigsaved));
1699 set_restore_sigmask();
1700 } else
1701 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1702 }
1703
1704 return err;
1705 }
1706
1707 #endif /* CONFIG_EPOLL */
1708
1709 #ifdef CONFIG_SIGNALFD
1710
1711 asmlinkage long compat_sys_signalfd4(int ufd,
1712 const compat_sigset_t __user *sigmask,
1713 compat_size_t sigsetsize, int flags)
1714 {
1715 compat_sigset_t ss32;
1716 sigset_t tmp;
1717 sigset_t __user *ksigmask;
1718
1719 if (sigsetsize != sizeof(compat_sigset_t))
1720 return -EINVAL;
1721 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1722 return -EFAULT;
1723 sigset_from_compat(&tmp, &ss32);
1724 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1725 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1726 return -EFAULT;
1727
1728 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
1729 }
1730
1731 asmlinkage long compat_sys_signalfd(int ufd,
1732 const compat_sigset_t __user *sigmask,
1733 compat_size_t sigsetsize)
1734 {
1735 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1736 }
1737 #endif /* CONFIG_SIGNALFD */
1738
1739 #ifdef CONFIG_FHANDLE
1740 /*
1741 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1742 * doesn't set the O_LARGEFILE flag.
1743 */
1744 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1745 struct file_handle __user *, handle, int, flags)
1746 {
1747 return do_handle_open(mountdirfd, handle, flags);
1748 }
1749 #endif
1750
1751 #ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE
1752 asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
1753 compat_off_t __user *offset, compat_size_t count)
1754 {
1755 loff_t pos;
1756 off_t off;
1757 ssize_t ret;
1758
1759 if (offset) {
1760 if (unlikely(get_user(off, offset)))
1761 return -EFAULT;
1762 pos = off;
1763 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1764 if (unlikely(put_user(pos, offset)))
1765 return -EFAULT;
1766 return ret;
1767 }
1768
1769 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1770 }
1771 #endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */
Linux with added FPC-III support