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staging: ks7010: remove unnecessary else statement
[linux-stable.git] / fs / compat.c
blobbd064a2c3550e41d510dae6ff6e1186af685af36
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/fs_struct.h>
48 #include <linux/slab.h>
49 #include <linux/pagemap.h>
50 #include <linux/aio.h>
51
52 #include <asm/uaccess.h>
53 #include <asm/mmu_context.h>
54 #include <asm/ioctls.h>
55 #include "internal.h"
56
57 /*
58 * Not all architectures have sys_utime, so implement this in terms
59 * of sys_utimes.
60 */
61 COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
62 struct compat_utimbuf __user *, t)
63 {
64 struct timespec tv[2];
65
66 if (t) {
67 if (get_user(tv[0].tv_sec, &t->actime) ||
68 get_user(tv[1].tv_sec, &t->modtime))
69 return -EFAULT;
70 tv[0].tv_nsec = 0;
71 tv[1].tv_nsec = 0;
72 }
73 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
74 }
75
76 COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
77 {
78 struct timespec tv[2];
79
80 if (t) {
81 if (compat_get_timespec(&tv[0], &t[0]) ||
82 compat_get_timespec(&tv[1], &t[1]))
83 return -EFAULT;
84
85 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
86 return 0;
87 }
88 return do_utimes(dfd, filename, t ? tv : NULL, flags);
89 }
90
91 COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
92 {
93 struct timespec tv[2];
94
95 if (t) {
96 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
97 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
98 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
99 get_user(tv[1].tv_nsec, &t[1].tv_usec))
100 return -EFAULT;
101 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
102 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
103 return -EINVAL;
104 tv[0].tv_nsec *= 1000;
105 tv[1].tv_nsec *= 1000;
106 }
107 return do_utimes(dfd, filename, t ? tv : NULL, 0);
108 }
109
110 COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
111 {
112 return compat_sys_futimesat(AT_FDCWD, filename, t);
113 }
114
115 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
116 {
117 struct compat_stat tmp;
118
119 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
120 return -EOVERFLOW;
121
122 memset(&tmp, 0, sizeof(tmp));
123 tmp.st_dev = old_encode_dev(stat->dev);
124 tmp.st_ino = stat->ino;
125 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
126 return -EOVERFLOW;
127 tmp.st_mode = stat->mode;
128 tmp.st_nlink = stat->nlink;
129 if (tmp.st_nlink != stat->nlink)
130 return -EOVERFLOW;
131 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
132 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
133 tmp.st_rdev = old_encode_dev(stat->rdev);
134 if ((u64) stat->size > MAX_NON_LFS)
135 return -EOVERFLOW;
136 tmp.st_size = stat->size;
137 tmp.st_atime = stat->atime.tv_sec;
138 tmp.st_atime_nsec = stat->atime.tv_nsec;
139 tmp.st_mtime = stat->mtime.tv_sec;
140 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
141 tmp.st_ctime = stat->ctime.tv_sec;
142 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
143 tmp.st_blocks = stat->blocks;
144 tmp.st_blksize = stat->blksize;
145 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
146 }
147
148 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
149 struct compat_stat __user *, statbuf)
150 {
151 struct kstat stat;
152 int error;
153
154 error = vfs_stat(filename, &stat);
155 if (error)
156 return error;
157 return cp_compat_stat(&stat, statbuf);
158 }
159
160 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
161 struct compat_stat __user *, statbuf)
162 {
163 struct kstat stat;
164 int error;
165
166 error = vfs_lstat(filename, &stat);
167 if (error)
168 return error;
169 return cp_compat_stat(&stat, statbuf);
170 }
171
172 #ifndef __ARCH_WANT_STAT64
173 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
174 const char __user *, filename,
175 struct compat_stat __user *, statbuf, int, flag)
176 {
177 struct kstat stat;
178 int error;
179
180 error = vfs_fstatat(dfd, filename, &stat, flag);
181 if (error)
182 return error;
183 return cp_compat_stat(&stat, statbuf);
184 }
185 #endif
186
187 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
188 struct compat_stat __user *, statbuf)
189 {
190 struct kstat stat;
191 int error = vfs_fstat(fd, &stat);
192
193 if (!error)
194 error = cp_compat_stat(&stat, statbuf);
195 return error;
196 }
197
198 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
199 {
200
201 if (sizeof ubuf->f_blocks == 4) {
202 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
203 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
204 return -EOVERFLOW;
205 /* f_files and f_ffree may be -1; it's okay
206 * to stuff that into 32 bits */
207 if (kbuf->f_files != 0xffffffffffffffffULL
208 && (kbuf->f_files & 0xffffffff00000000ULL))
209 return -EOVERFLOW;
210 if (kbuf->f_ffree != 0xffffffffffffffffULL
211 && (kbuf->f_ffree & 0xffffffff00000000ULL))
212 return -EOVERFLOW;
213 }
214 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
215 __put_user(kbuf->f_type, &ubuf->f_type) ||
216 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
217 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
218 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
219 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
220 __put_user(kbuf->f_files, &ubuf->f_files) ||
221 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
222 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
223 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
224 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
225 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
226 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
227 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
228 return -EFAULT;
229 return 0;
230 }
231
232 /*
233 * The following statfs calls are copies of code from fs/statfs.c and
234 * should be checked against those from time to time
235 */
236 COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
237 {
238 struct kstatfs tmp;
239 int error = user_statfs(pathname, &tmp);
240 if (!error)
241 error = put_compat_statfs(buf, &tmp);
242 return error;
243 }
244
245 COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
246 {
247 struct kstatfs tmp;
248 int error = fd_statfs(fd, &tmp);
249 if (!error)
250 error = put_compat_statfs(buf, &tmp);
251 return error;
252 }
253
254 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
255 {
256 if (sizeof ubuf->f_blocks == 4) {
257 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
258 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
259 return -EOVERFLOW;
260 /* f_files and f_ffree may be -1; it's okay
261 * to stuff that into 32 bits */
262 if (kbuf->f_files != 0xffffffffffffffffULL
263 && (kbuf->f_files & 0xffffffff00000000ULL))
264 return -EOVERFLOW;
265 if (kbuf->f_ffree != 0xffffffffffffffffULL
266 && (kbuf->f_ffree & 0xffffffff00000000ULL))
267 return -EOVERFLOW;
268 }
269 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
270 __put_user(kbuf->f_type, &ubuf->f_type) ||
271 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
272 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
273 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
274 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
275 __put_user(kbuf->f_files, &ubuf->f_files) ||
276 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
277 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
278 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
279 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
280 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
281 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
282 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
283 return -EFAULT;
284 return 0;
285 }
286
287 COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
288 {
289 struct kstatfs tmp;
290 int error;
291
292 if (sz != sizeof(*buf))
293 return -EINVAL;
294
295 error = user_statfs(pathname, &tmp);
296 if (!error)
297 error = put_compat_statfs64(buf, &tmp);
298 return error;
299 }
300
301 COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
302 {
303 struct kstatfs tmp;
304 int error;
305
306 if (sz != sizeof(*buf))
307 return -EINVAL;
308
309 error = fd_statfs(fd, &tmp);
310 if (!error)
311 error = put_compat_statfs64(buf, &tmp);
312 return error;
313 }
314
315 /*
316 * This is a copy of sys_ustat, just dealing with a structure layout.
317 * Given how simple this syscall is that apporach is more maintainable
318 * than the various conversion hacks.
319 */
320 COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
321 {
322 struct compat_ustat tmp;
323 struct kstatfs sbuf;
324 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
325 if (err)
326 return err;
327
328 memset(&tmp, 0, sizeof(struct compat_ustat));
329 tmp.f_tfree = sbuf.f_bfree;
330 tmp.f_tinode = sbuf.f_ffree;
331 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
332 return -EFAULT;
333 return 0;
334 }
335
336 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
337 {
338 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
339 __get_user(kfl->l_type, &ufl->l_type) ||
340 __get_user(kfl->l_whence, &ufl->l_whence) ||
341 __get_user(kfl->l_start, &ufl->l_start) ||
342 __get_user(kfl->l_len, &ufl->l_len) ||
343 __get_user(kfl->l_pid, &ufl->l_pid))
344 return -EFAULT;
345 return 0;
346 }
347
348 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
349 {
350 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
351 __put_user(kfl->l_type, &ufl->l_type) ||
352 __put_user(kfl->l_whence, &ufl->l_whence) ||
353 __put_user(kfl->l_start, &ufl->l_start) ||
354 __put_user(kfl->l_len, &ufl->l_len) ||
355 __put_user(kfl->l_pid, &ufl->l_pid))
356 return -EFAULT;
357 return 0;
358 }
359
360 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
361 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
362 {
363 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
364 __get_user(kfl->l_type, &ufl->l_type) ||
365 __get_user(kfl->l_whence, &ufl->l_whence) ||
366 __get_user(kfl->l_start, &ufl->l_start) ||
367 __get_user(kfl->l_len, &ufl->l_len) ||
368 __get_user(kfl->l_pid, &ufl->l_pid))
369 return -EFAULT;
370 return 0;
371 }
372 #endif
373
374 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
375 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
376 {
377 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
378 __put_user(kfl->l_type, &ufl->l_type) ||
379 __put_user(kfl->l_whence, &ufl->l_whence) ||
380 __put_user(kfl->l_start, &ufl->l_start) ||
381 __put_user(kfl->l_len, &ufl->l_len) ||
382 __put_user(kfl->l_pid, &ufl->l_pid))
383 return -EFAULT;
384 return 0;
385 }
386 #endif
387
388 static unsigned int
389 convert_fcntl_cmd(unsigned int cmd)
390 {
391 switch (cmd) {
392 case F_GETLK64:
393 return F_GETLK;
394 case F_SETLK64:
395 return F_SETLK;
396 case F_SETLKW64:
397 return F_SETLKW;
398 }
399
400 return cmd;
401 }
402
403 COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
404 compat_ulong_t, arg)
405 {
406 mm_segment_t old_fs;
407 struct flock f;
408 long ret;
409 unsigned int conv_cmd;
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 case F_OFD_GETLK:
447 case F_OFD_SETLK:
448 case F_OFD_SETLKW:
449 ret = get_compat_flock64(&f, compat_ptr(arg));
450 if (ret != 0)
451 break;
452 old_fs = get_fs();
453 set_fs(KERNEL_DS);
454 conv_cmd = convert_fcntl_cmd(cmd);
455 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
456 set_fs(old_fs);
457 if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
458 /* need to return lock information - see above for commentary */
459 if (f.l_start > COMPAT_LOFF_T_MAX)
460 ret = -EOVERFLOW;
461 if (f.l_len > COMPAT_LOFF_T_MAX)
462 f.l_len = COMPAT_LOFF_T_MAX;
463 if (ret == 0)
464 ret = put_compat_flock64(&f, compat_ptr(arg));
465 }
466 break;
467
468 default:
469 ret = sys_fcntl(fd, cmd, arg);
470 break;
471 }
472 return ret;
473 }
474
475 COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
476 compat_ulong_t, arg)
477 {
478 switch (cmd) {
479 case F_GETLK64:
480 case F_SETLK64:
481 case F_SETLKW64:
482 case F_OFD_GETLK:
483 case F_OFD_SETLK:
484 case F_OFD_SETLKW:
485 return -EINVAL;
486 }
487 return compat_sys_fcntl64(fd, cmd, arg);
488 }
489
490 COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_reqs, u32 __user *, ctx32p)
491 {
492 long ret;
493 aio_context_t ctx64;
494
495 mm_segment_t oldfs = get_fs();
496 if (unlikely(get_user(ctx64, ctx32p)))
497 return -EFAULT;
498
499 set_fs(KERNEL_DS);
500 /* The __user pointer cast is valid because of the set_fs() */
501 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
502 set_fs(oldfs);
503 /* truncating is ok because it's a user address */
504 if (!ret)
505 ret = put_user((u32) ctx64, ctx32p);
506 return ret;
507 }
508
509 COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
510 compat_long_t, min_nr,
511 compat_long_t, nr,
512 struct io_event __user *, events,
513 struct compat_timespec __user *, timeout)
514 {
515 struct timespec t;
516 struct timespec __user *ut = NULL;
517
518 if (timeout) {
519 if (compat_get_timespec(&t, timeout))
520 return -EFAULT;
521
522 ut = compat_alloc_user_space(sizeof(*ut));
523 if (copy_to_user(ut, &t, sizeof(t)) )
524 return -EFAULT;
525 }
526 return sys_io_getevents(ctx_id, min_nr, nr, events, ut);
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)
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 COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
623 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 COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
776 const char __user *, dir_name,
777 const char __user *, type, compat_ulong_t, flags,
778 const void __user *, data)
779 {
780 char *kernel_type;
781 void *options;
782 char *kernel_dev;
783 int retval;
784
785 kernel_type = copy_mount_string(type);
786 retval = PTR_ERR(kernel_type);
787 if (IS_ERR(kernel_type))
788 goto out;
789
790 kernel_dev = copy_mount_string(dev_name);
791 retval = PTR_ERR(kernel_dev);
792 if (IS_ERR(kernel_dev))
793 goto out1;
794
795 options = copy_mount_options(data);
796 retval = PTR_ERR(options);
797 if (IS_ERR(options))
798 goto out2;
799
800 if (kernel_type && options) {
801 if (!strcmp(kernel_type, NCPFS_NAME)) {
802 do_ncp_super_data_conv(options);
803 } else if (!strcmp(kernel_type, NFS4_NAME)) {
804 retval = -EINVAL;
805 if (do_nfs4_super_data_conv(options))
806 goto out3;
807 }
808 }
809
810 retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
811
812 out3:
813 kfree(options);
814 out2:
815 kfree(kernel_dev);
816 out1:
817 kfree(kernel_type);
818 out:
819 return retval;
820 }
821
822 struct compat_old_linux_dirent {
823 compat_ulong_t d_ino;
824 compat_ulong_t d_offset;
825 unsigned short d_namlen;
826 char d_name[1];
827 };
828
829 struct compat_readdir_callback {
830 struct dir_context ctx;
831 struct compat_old_linux_dirent __user *dirent;
832 int result;
833 };
834
835 static int compat_fillonedir(struct dir_context *ctx, const char *name,
836 int namlen, loff_t offset, u64 ino,
837 unsigned int d_type)
838 {
839 struct compat_readdir_callback *buf =
840 container_of(ctx, struct compat_readdir_callback, ctx);
841 struct compat_old_linux_dirent __user *dirent;
842 compat_ulong_t d_ino;
843
844 if (buf->result)
845 return -EINVAL;
846 d_ino = ino;
847 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
848 buf->result = -EOVERFLOW;
849 return -EOVERFLOW;
850 }
851 buf->result++;
852 dirent = buf->dirent;
853 if (!access_ok(VERIFY_WRITE, dirent,
854 (unsigned long)(dirent->d_name + namlen + 1) -
855 (unsigned long)dirent))
856 goto efault;
857 if ( __put_user(d_ino, &dirent->d_ino) ||
858 __put_user(offset, &dirent->d_offset) ||
859 __put_user(namlen, &dirent->d_namlen) ||
860 __copy_to_user(dirent->d_name, name, namlen) ||
861 __put_user(0, dirent->d_name + namlen))
862 goto efault;
863 return 0;
864 efault:
865 buf->result = -EFAULT;
866 return -EFAULT;
867 }
868
869 COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
870 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
871 {
872 int error;
873 struct fd f = fdget_pos(fd);
874 struct compat_readdir_callback buf = {
875 .ctx.actor = compat_fillonedir,
876 .dirent = dirent
877 };
878
879 if (!f.file)
880 return -EBADF;
881
882 error = iterate_dir(f.file, &buf.ctx);
883 if (buf.result)
884 error = buf.result;
885
886 fdput_pos(f);
887 return error;
888 }
889
890 struct compat_linux_dirent {
891 compat_ulong_t d_ino;
892 compat_ulong_t d_off;
893 unsigned short d_reclen;
894 char d_name[1];
895 };
896
897 struct compat_getdents_callback {
898 struct dir_context ctx;
899 struct compat_linux_dirent __user *current_dir;
900 struct compat_linux_dirent __user *previous;
901 int count;
902 int error;
903 };
904
905 static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
906 loff_t offset, u64 ino, unsigned int d_type)
907 {
908 struct compat_linux_dirent __user * dirent;
909 struct compat_getdents_callback *buf =
910 container_of(ctx, struct compat_getdents_callback, ctx);
911 compat_ulong_t d_ino;
912 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
913 namlen + 2, sizeof(compat_long_t));
914
915 buf->error = -EINVAL; /* only used if we fail.. */
916 if (reclen > buf->count)
917 return -EINVAL;
918 d_ino = ino;
919 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
920 buf->error = -EOVERFLOW;
921 return -EOVERFLOW;
922 }
923 dirent = buf->previous;
924 if (dirent) {
925 if (signal_pending(current))
926 return -EINTR;
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 COMPAT_SYSCALL_DEFINE3(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 .ctx.actor = compat_filldir,
958 .current_dir = dirent,
959 .count = count
960 };
961 int error;
962
963 if (!access_ok(VERIFY_WRITE, dirent, count))
964 return -EFAULT;
965
966 f = fdget_pos(fd);
967 if (!f.file)
968 return -EBADF;
969
970 error = iterate_dir(f.file, &buf.ctx);
971 if (error >= 0)
972 error = buf.error;
973 lastdirent = buf.previous;
974 if (lastdirent) {
975 if (put_user(buf.ctx.pos, &lastdirent->d_off))
976 error = -EFAULT;
977 else
978 error = count - buf.count;
979 }
980 fdput_pos(f);
981 return error;
982 }
983
984 #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
985
986 struct compat_getdents_callback64 {
987 struct dir_context ctx;
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(struct dir_context *ctx, const char *name,
995 int namlen, loff_t offset, u64 ino,
996 unsigned int d_type)
997 {
998 struct linux_dirent64 __user *dirent;
999 struct compat_getdents_callback64 *buf =
1000 container_of(ctx, struct compat_getdents_callback64, ctx);
1001 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1002 sizeof(u64));
1003 u64 off;
1004
1005 buf->error = -EINVAL; /* only used if we fail.. */
1006 if (reclen > buf->count)
1007 return -EINVAL;
1008 dirent = buf->previous;
1009
1010 if (dirent) {
1011 if (signal_pending(current))
1012 return -EINTR;
1013 if (__put_user_unaligned(offset, &dirent->d_off))
1014 goto efault;
1015 }
1016 dirent = buf->current_dir;
1017 if (__put_user_unaligned(ino, &dirent->d_ino))
1018 goto efault;
1019 off = 0;
1020 if (__put_user_unaligned(off, &dirent->d_off))
1021 goto efault;
1022 if (__put_user(reclen, &dirent->d_reclen))
1023 goto efault;
1024 if (__put_user(d_type, &dirent->d_type))
1025 goto efault;
1026 if (copy_to_user(dirent->d_name, name, namlen))
1027 goto efault;
1028 if (__put_user(0, dirent->d_name + namlen))
1029 goto efault;
1030 buf->previous = dirent;
1031 dirent = (void __user *)dirent + reclen;
1032 buf->current_dir = dirent;
1033 buf->count -= reclen;
1034 return 0;
1035 efault:
1036 buf->error = -EFAULT;
1037 return -EFAULT;
1038 }
1039
1040 COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
1041 struct linux_dirent64 __user *, dirent, unsigned int, count)
1042 {
1043 struct fd f;
1044 struct linux_dirent64 __user * lastdirent;
1045 struct compat_getdents_callback64 buf = {
1046 .ctx.actor = compat_filldir64,
1047 .current_dir = dirent,
1048 .count = count
1049 };
1050 int error;
1051
1052 if (!access_ok(VERIFY_WRITE, dirent, count))
1053 return -EFAULT;
1054
1055 f = fdget_pos(fd);
1056 if (!f.file)
1057 return -EBADF;
1058
1059 error = iterate_dir(f.file, &buf.ctx);
1060 if (error >= 0)
1061 error = buf.error;
1062 lastdirent = buf.previous;
1063 if (lastdirent) {
1064 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
1065 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1066 error = -EFAULT;
1067 else
1068 error = count - buf.count;
1069 }
1070 fdput_pos(f);
1071 return error;
1072 }
1073 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
1074
1075 /*
1076 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1077 * O_LARGEFILE flag.
1078 */
1079 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1080 {
1081 return do_sys_open(AT_FDCWD, filename, flags, mode);
1082 }
1083
1084 /*
1085 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1086 * O_LARGEFILE flag.
1087 */
1088 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1089 {
1090 return do_sys_open(dfd, filename, flags, mode);
1091 }
1092
1093 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1094
1095 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1096 int timeval, int ret)
1097 {
1098 struct timespec ts;
1099
1100 if (!p)
1101 return ret;
1102
1103 if (current->personality & STICKY_TIMEOUTS)
1104 goto sticky;
1105
1106 /* No update for zero timeout */
1107 if (!end_time->tv_sec && !end_time->tv_nsec)
1108 return ret;
1109
1110 ktime_get_ts(&ts);
1111 ts = timespec_sub(*end_time, ts);
1112 if (ts.tv_sec < 0)
1113 ts.tv_sec = ts.tv_nsec = 0;
1114
1115 if (timeval) {
1116 struct compat_timeval rtv;
1117
1118 rtv.tv_sec = ts.tv_sec;
1119 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1120
1121 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1122 return ret;
1123 } else {
1124 struct compat_timespec rts;
1125
1126 rts.tv_sec = ts.tv_sec;
1127 rts.tv_nsec = ts.tv_nsec;
1128
1129 if (!copy_to_user(p, &rts, sizeof(rts)))
1130 return ret;
1131 }
1132 /*
1133 * If an application puts its timeval in read-only memory, we
1134 * don't want the Linux-specific update to the timeval to
1135 * cause a fault after the select has completed
1136 * successfully. However, because we're not updating the
1137 * timeval, we can't restart the system call.
1138 */
1139
1140 sticky:
1141 if (ret == -ERESTARTNOHAND)
1142 ret = -EINTR;
1143 return ret;
1144 }
1145
1146 /*
1147 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1148 * 64-bit unsigned longs.
1149 */
1150 static
1151 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1152 unsigned long *fdset)
1153 {
1154 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1155 if (ufdset) {
1156 unsigned long odd;
1157
1158 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1159 return -EFAULT;
1160
1161 odd = nr & 1UL;
1162 nr &= ~1UL;
1163 while (nr) {
1164 unsigned long h, l;
1165 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1166 return -EFAULT;
1167 ufdset += 2;
1168 *fdset++ = h << 32 | l;
1169 nr -= 2;
1170 }
1171 if (odd && __get_user(*fdset, ufdset))
1172 return -EFAULT;
1173 } else {
1174 /* Tricky, must clear full unsigned long in the
1175 * kernel fdset at the end, this makes sure that
1176 * actually happens.
1177 */
1178 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1179 }
1180 return 0;
1181 }
1182
1183 static
1184 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1185 unsigned long *fdset)
1186 {
1187 unsigned long odd;
1188 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1189
1190 if (!ufdset)
1191 return 0;
1192
1193 odd = nr & 1UL;
1194 nr &= ~1UL;
1195 while (nr) {
1196 unsigned long h, l;
1197 l = *fdset++;
1198 h = l >> 32;
1199 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1200 return -EFAULT;
1201 ufdset += 2;
1202 nr -= 2;
1203 }
1204 if (odd && __put_user(*fdset, ufdset))
1205 return -EFAULT;
1206 return 0;
1207 }
1208
1209
1210 /*
1211 * This is a virtual copy of sys_select from fs/select.c and probably
1212 * should be compared to it from time to time
1213 */
1214
1215 /*
1216 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1217 * like to be certain this leads to no problems. So I return
1218 * EINTR just for safety.
1219 *
1220 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1221 * I'm trying ERESTARTNOHAND which restart only when you want to.
1222 */
1223 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1224 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1225 struct timespec *end_time)
1226 {
1227 fd_set_bits fds;
1228 void *bits;
1229 int size, max_fds, ret = -EINVAL;
1230 struct fdtable *fdt;
1231 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1232
1233 if (n < 0)
1234 goto out_nofds;
1235
1236 /* max_fds can increase, so grab it once to avoid race */
1237 rcu_read_lock();
1238 fdt = files_fdtable(current->files);
1239 max_fds = fdt->max_fds;
1240 rcu_read_unlock();
1241 if (n > max_fds)
1242 n = max_fds;
1243
1244 /*
1245 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1246 * since we used fdset we need to allocate memory in units of
1247 * long-words.
1248 */
1249 size = FDS_BYTES(n);
1250 bits = stack_fds;
1251 if (size > sizeof(stack_fds) / 6) {
1252 bits = kmalloc(6 * size, GFP_KERNEL);
1253 ret = -ENOMEM;
1254 if (!bits)
1255 goto out_nofds;
1256 }
1257 fds.in = (unsigned long *) bits;
1258 fds.out = (unsigned long *) (bits + size);
1259 fds.ex = (unsigned long *) (bits + 2*size);
1260 fds.res_in = (unsigned long *) (bits + 3*size);
1261 fds.res_out = (unsigned long *) (bits + 4*size);
1262 fds.res_ex = (unsigned long *) (bits + 5*size);
1263
1264 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1265 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1266 (ret = compat_get_fd_set(n, exp, fds.ex)))
1267 goto out;
1268 zero_fd_set(n, fds.res_in);
1269 zero_fd_set(n, fds.res_out);
1270 zero_fd_set(n, fds.res_ex);
1271
1272 ret = do_select(n, &fds, end_time);
1273
1274 if (ret < 0)
1275 goto out;
1276 if (!ret) {
1277 ret = -ERESTARTNOHAND;
1278 if (signal_pending(current))
1279 goto out;
1280 ret = 0;
1281 }
1282
1283 if (compat_set_fd_set(n, inp, fds.res_in) ||
1284 compat_set_fd_set(n, outp, fds.res_out) ||
1285 compat_set_fd_set(n, exp, fds.res_ex))
1286 ret = -EFAULT;
1287 out:
1288 if (bits != stack_fds)
1289 kfree(bits);
1290 out_nofds:
1291 return ret;
1292 }
1293
1294 COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1295 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1296 struct compat_timeval __user *, tvp)
1297 {
1298 struct timespec end_time, *to = NULL;
1299 struct compat_timeval tv;
1300 int ret;
1301
1302 if (tvp) {
1303 if (copy_from_user(&tv, tvp, sizeof(tv)))
1304 return -EFAULT;
1305
1306 to = &end_time;
1307 if (poll_select_set_timeout(to,
1308 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1309 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1310 return -EINVAL;
1311 }
1312
1313 ret = compat_core_sys_select(n, inp, outp, exp, to);
1314 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1315
1316 return ret;
1317 }
1318
1319 struct compat_sel_arg_struct {
1320 compat_ulong_t n;
1321 compat_uptr_t inp;
1322 compat_uptr_t outp;
1323 compat_uptr_t exp;
1324 compat_uptr_t tvp;
1325 };
1326
1327 COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1328 {
1329 struct compat_sel_arg_struct a;
1330
1331 if (copy_from_user(&a, arg, sizeof(a)))
1332 return -EFAULT;
1333 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1334 compat_ptr(a.exp), compat_ptr(a.tvp));
1335 }
1336
1337 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1338 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1339 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1340 compat_size_t sigsetsize)
1341 {
1342 compat_sigset_t ss32;
1343 sigset_t ksigmask, sigsaved;
1344 struct compat_timespec ts;
1345 struct timespec end_time, *to = NULL;
1346 int ret;
1347
1348 if (tsp) {
1349 if (copy_from_user(&ts, tsp, sizeof(ts)))
1350 return -EFAULT;
1351
1352 to = &end_time;
1353 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1354 return -EINVAL;
1355 }
1356
1357 if (sigmask) {
1358 if (sigsetsize != sizeof(compat_sigset_t))
1359 return -EINVAL;
1360 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1361 return -EFAULT;
1362 sigset_from_compat(&ksigmask, &ss32);
1363
1364 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1365 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1366 }
1367
1368 ret = compat_core_sys_select(n, inp, outp, exp, to);
1369 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1370
1371 if (ret == -ERESTARTNOHAND) {
1372 /*
1373 * Don't restore the signal mask yet. Let do_signal() deliver
1374 * the signal on the way back to userspace, before the signal
1375 * mask is restored.
1376 */
1377 if (sigmask) {
1378 memcpy(&current->saved_sigmask, &sigsaved,
1379 sizeof(sigsaved));
1380 set_restore_sigmask();
1381 }
1382 } else if (sigmask)
1383 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1384
1385 return ret;
1386 }
1387
1388 COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1389 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1390 struct compat_timespec __user *, tsp, void __user *, sig)
1391 {
1392 compat_size_t sigsetsize = 0;
1393 compat_uptr_t up = 0;
1394
1395 if (sig) {
1396 if (!access_ok(VERIFY_READ, sig,
1397 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1398 __get_user(up, (compat_uptr_t __user *)sig) ||
1399 __get_user(sigsetsize,
1400 (compat_size_t __user *)(sig+sizeof(up))))
1401 return -EFAULT;
1402 }
1403 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1404 sigsetsize);
1405 }
1406
1407 COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1408 unsigned int, nfds, struct compat_timespec __user *, tsp,
1409 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1410 {
1411 compat_sigset_t ss32;
1412 sigset_t ksigmask, sigsaved;
1413 struct compat_timespec ts;
1414 struct timespec end_time, *to = NULL;
1415 int ret;
1416
1417 if (tsp) {
1418 if (copy_from_user(&ts, tsp, sizeof(ts)))
1419 return -EFAULT;
1420
1421 to = &end_time;
1422 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1423 return -EINVAL;
1424 }
1425
1426 if (sigmask) {
1427 if (sigsetsize != sizeof(compat_sigset_t))
1428 return -EINVAL;
1429 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1430 return -EFAULT;
1431 sigset_from_compat(&ksigmask, &ss32);
1432
1433 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1434 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1435 }
1436
1437 ret = do_sys_poll(ufds, nfds, to);
1438
1439 /* We can restart this syscall, usually */
1440 if (ret == -EINTR) {
1441 /*
1442 * Don't restore the signal mask yet. Let do_signal() deliver
1443 * the signal on the way back to userspace, before the signal
1444 * mask is restored.
1445 */
1446 if (sigmask) {
1447 memcpy(&current->saved_sigmask, &sigsaved,
1448 sizeof(sigsaved));
1449 set_restore_sigmask();
1450 }
1451 ret = -ERESTARTNOHAND;
1452 } else if (sigmask)
1453 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1454
1455 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1456
1457 return ret;
1458 }
1459
1460 #ifdef CONFIG_FHANDLE
1461 /*
1462 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1463 * doesn't set the O_LARGEFILE flag.
1464 */
1465 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1466 struct file_handle __user *, handle, int, flags)
1467 {
1468 return do_handle_open(mountdirfd, handle, flags);
1469 }
1470 #endif
Linux kernel stable tree