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[linux/fpc-iii.git] / fs / compat.c
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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 <linux/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_bsize) == 4) {
257 if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
258 kbuf->f_frsize | kbuf->f_flags) & 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 /* A write operation does a read from user space and vice versa */
491 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
492
493 ssize_t compat_rw_copy_check_uvector(int type,
494 const struct compat_iovec __user *uvector, unsigned long nr_segs,
495 unsigned long fast_segs, struct iovec *fast_pointer,
496 struct iovec **ret_pointer)
497 {
498 compat_ssize_t tot_len;
499 struct iovec *iov = *ret_pointer = fast_pointer;
500 ssize_t ret = 0;
501 int seg;
502
503 /*
504 * SuS says "The readv() function *may* fail if the iovcnt argument
505 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
506 * traditionally returned zero for zero segments, so...
507 */
508 if (nr_segs == 0)
509 goto out;
510
511 ret = -EINVAL;
512 if (nr_segs > UIO_MAXIOV)
513 goto out;
514 if (nr_segs > fast_segs) {
515 ret = -ENOMEM;
516 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
517 if (iov == NULL)
518 goto out;
519 }
520 *ret_pointer = iov;
521
522 ret = -EFAULT;
523 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
524 goto out;
525
526 /*
527 * Single unix specification:
528 * We should -EINVAL if an element length is not >= 0 and fitting an
529 * ssize_t.
530 *
531 * In Linux, the total length is limited to MAX_RW_COUNT, there is
532 * no overflow possibility.
533 */
534 tot_len = 0;
535 ret = -EINVAL;
536 for (seg = 0; seg < nr_segs; seg++) {
537 compat_uptr_t buf;
538 compat_ssize_t len;
539
540 if (__get_user(len, &uvector->iov_len) ||
541 __get_user(buf, &uvector->iov_base)) {
542 ret = -EFAULT;
543 goto out;
544 }
545 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
546 goto out;
547 if (type >= 0 &&
548 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
549 ret = -EFAULT;
550 goto out;
551 }
552 if (len > MAX_RW_COUNT - tot_len)
553 len = MAX_RW_COUNT - tot_len;
554 tot_len += len;
555 iov->iov_base = compat_ptr(buf);
556 iov->iov_len = (compat_size_t) len;
557 uvector++;
558 iov++;
559 }
560 ret = tot_len;
561
562 out:
563 return ret;
564 }
565
566 struct compat_ncp_mount_data {
567 compat_int_t version;
568 compat_uint_t ncp_fd;
569 __compat_uid_t mounted_uid;
570 compat_pid_t wdog_pid;
571 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
572 compat_uint_t time_out;
573 compat_uint_t retry_count;
574 compat_uint_t flags;
575 __compat_uid_t uid;
576 __compat_gid_t gid;
577 compat_mode_t file_mode;
578 compat_mode_t dir_mode;
579 };
580
581 struct compat_ncp_mount_data_v4 {
582 compat_int_t version;
583 compat_ulong_t flags;
584 compat_ulong_t mounted_uid;
585 compat_long_t wdog_pid;
586 compat_uint_t ncp_fd;
587 compat_uint_t time_out;
588 compat_uint_t retry_count;
589 compat_ulong_t uid;
590 compat_ulong_t gid;
591 compat_ulong_t file_mode;
592 compat_ulong_t dir_mode;
593 };
594
595 static void *do_ncp_super_data_conv(void *raw_data)
596 {
597 int version = *(unsigned int *)raw_data;
598
599 if (version == 3) {
600 struct compat_ncp_mount_data *c_n = raw_data;
601 struct ncp_mount_data *n = raw_data;
602
603 n->dir_mode = c_n->dir_mode;
604 n->file_mode = c_n->file_mode;
605 n->gid = c_n->gid;
606 n->uid = c_n->uid;
607 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
608 n->wdog_pid = c_n->wdog_pid;
609 n->mounted_uid = c_n->mounted_uid;
610 } else if (version == 4) {
611 struct compat_ncp_mount_data_v4 *c_n = raw_data;
612 struct ncp_mount_data_v4 *n = raw_data;
613
614 n->dir_mode = c_n->dir_mode;
615 n->file_mode = c_n->file_mode;
616 n->gid = c_n->gid;
617 n->uid = c_n->uid;
618 n->retry_count = c_n->retry_count;
619 n->time_out = c_n->time_out;
620 n->ncp_fd = c_n->ncp_fd;
621 n->wdog_pid = c_n->wdog_pid;
622 n->mounted_uid = c_n->mounted_uid;
623 n->flags = c_n->flags;
624 } else if (version != 5) {
625 return NULL;
626 }
627
628 return raw_data;
629 }
630
631
632 struct compat_nfs_string {
633 compat_uint_t len;
634 compat_uptr_t data;
635 };
636
637 static inline void compat_nfs_string(struct nfs_string *dst,
638 struct compat_nfs_string *src)
639 {
640 dst->data = compat_ptr(src->data);
641 dst->len = src->len;
642 }
643
644 struct compat_nfs4_mount_data_v1 {
645 compat_int_t version;
646 compat_int_t flags;
647 compat_int_t rsize;
648 compat_int_t wsize;
649 compat_int_t timeo;
650 compat_int_t retrans;
651 compat_int_t acregmin;
652 compat_int_t acregmax;
653 compat_int_t acdirmin;
654 compat_int_t acdirmax;
655 struct compat_nfs_string client_addr;
656 struct compat_nfs_string mnt_path;
657 struct compat_nfs_string hostname;
658 compat_uint_t host_addrlen;
659 compat_uptr_t host_addr;
660 compat_int_t proto;
661 compat_int_t auth_flavourlen;
662 compat_uptr_t auth_flavours;
663 };
664
665 static int do_nfs4_super_data_conv(void *raw_data)
666 {
667 int version = *(compat_uint_t *) raw_data;
668
669 if (version == 1) {
670 struct compat_nfs4_mount_data_v1 *raw = raw_data;
671 struct nfs4_mount_data *real = raw_data;
672
673 /* copy the fields backwards */
674 real->auth_flavours = compat_ptr(raw->auth_flavours);
675 real->auth_flavourlen = raw->auth_flavourlen;
676 real->proto = raw->proto;
677 real->host_addr = compat_ptr(raw->host_addr);
678 real->host_addrlen = raw->host_addrlen;
679 compat_nfs_string(&real->hostname, &raw->hostname);
680 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
681 compat_nfs_string(&real->client_addr, &raw->client_addr);
682 real->acdirmax = raw->acdirmax;
683 real->acdirmin = raw->acdirmin;
684 real->acregmax = raw->acregmax;
685 real->acregmin = raw->acregmin;
686 real->retrans = raw->retrans;
687 real->timeo = raw->timeo;
688 real->wsize = raw->wsize;
689 real->rsize = raw->rsize;
690 real->flags = raw->flags;
691 real->version = raw->version;
692 }
693
694 return 0;
695 }
696
697 #define NCPFS_NAME "ncpfs"
698 #define NFS4_NAME "nfs4"
699
700 COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
701 const char __user *, dir_name,
702 const char __user *, type, compat_ulong_t, flags,
703 const void __user *, data)
704 {
705 char *kernel_type;
706 void *options;
707 char *kernel_dev;
708 int retval;
709
710 kernel_type = copy_mount_string(type);
711 retval = PTR_ERR(kernel_type);
712 if (IS_ERR(kernel_type))
713 goto out;
714
715 kernel_dev = copy_mount_string(dev_name);
716 retval = PTR_ERR(kernel_dev);
717 if (IS_ERR(kernel_dev))
718 goto out1;
719
720 options = copy_mount_options(data);
721 retval = PTR_ERR(options);
722 if (IS_ERR(options))
723 goto out2;
724
725 if (kernel_type && options) {
726 if (!strcmp(kernel_type, NCPFS_NAME)) {
727 do_ncp_super_data_conv(options);
728 } else if (!strcmp(kernel_type, NFS4_NAME)) {
729 retval = -EINVAL;
730 if (do_nfs4_super_data_conv(options))
731 goto out3;
732 }
733 }
734
735 retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
736
737 out3:
738 kfree(options);
739 out2:
740 kfree(kernel_dev);
741 out1:
742 kfree(kernel_type);
743 out:
744 return retval;
745 }
746
747 struct compat_old_linux_dirent {
748 compat_ulong_t d_ino;
749 compat_ulong_t d_offset;
750 unsigned short d_namlen;
751 char d_name[1];
752 };
753
754 struct compat_readdir_callback {
755 struct dir_context ctx;
756 struct compat_old_linux_dirent __user *dirent;
757 int result;
758 };
759
760 static int compat_fillonedir(struct dir_context *ctx, const char *name,
761 int namlen, loff_t offset, u64 ino,
762 unsigned int d_type)
763 {
764 struct compat_readdir_callback *buf =
765 container_of(ctx, struct compat_readdir_callback, ctx);
766 struct compat_old_linux_dirent __user *dirent;
767 compat_ulong_t d_ino;
768
769 if (buf->result)
770 return -EINVAL;
771 d_ino = ino;
772 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
773 buf->result = -EOVERFLOW;
774 return -EOVERFLOW;
775 }
776 buf->result++;
777 dirent = buf->dirent;
778 if (!access_ok(VERIFY_WRITE, dirent,
779 (unsigned long)(dirent->d_name + namlen + 1) -
780 (unsigned long)dirent))
781 goto efault;
782 if ( __put_user(d_ino, &dirent->d_ino) ||
783 __put_user(offset, &dirent->d_offset) ||
784 __put_user(namlen, &dirent->d_namlen) ||
785 __copy_to_user(dirent->d_name, name, namlen) ||
786 __put_user(0, dirent->d_name + namlen))
787 goto efault;
788 return 0;
789 efault:
790 buf->result = -EFAULT;
791 return -EFAULT;
792 }
793
794 COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
795 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
796 {
797 int error;
798 struct fd f = fdget_pos(fd);
799 struct compat_readdir_callback buf = {
800 .ctx.actor = compat_fillonedir,
801 .dirent = dirent
802 };
803
804 if (!f.file)
805 return -EBADF;
806
807 error = iterate_dir(f.file, &buf.ctx);
808 if (buf.result)
809 error = buf.result;
810
811 fdput_pos(f);
812 return error;
813 }
814
815 struct compat_linux_dirent {
816 compat_ulong_t d_ino;
817 compat_ulong_t d_off;
818 unsigned short d_reclen;
819 char d_name[1];
820 };
821
822 struct compat_getdents_callback {
823 struct dir_context ctx;
824 struct compat_linux_dirent __user *current_dir;
825 struct compat_linux_dirent __user *previous;
826 int count;
827 int error;
828 };
829
830 static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
831 loff_t offset, u64 ino, unsigned int d_type)
832 {
833 struct compat_linux_dirent __user * dirent;
834 struct compat_getdents_callback *buf =
835 container_of(ctx, struct compat_getdents_callback, ctx);
836 compat_ulong_t d_ino;
837 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
838 namlen + 2, sizeof(compat_long_t));
839
840 buf->error = -EINVAL; /* only used if we fail.. */
841 if (reclen > buf->count)
842 return -EINVAL;
843 d_ino = ino;
844 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
845 buf->error = -EOVERFLOW;
846 return -EOVERFLOW;
847 }
848 dirent = buf->previous;
849 if (dirent) {
850 if (signal_pending(current))
851 return -EINTR;
852 if (__put_user(offset, &dirent->d_off))
853 goto efault;
854 }
855 dirent = buf->current_dir;
856 if (__put_user(d_ino, &dirent->d_ino))
857 goto efault;
858 if (__put_user(reclen, &dirent->d_reclen))
859 goto efault;
860 if (copy_to_user(dirent->d_name, name, namlen))
861 goto efault;
862 if (__put_user(0, dirent->d_name + namlen))
863 goto efault;
864 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
865 goto efault;
866 buf->previous = dirent;
867 dirent = (void __user *)dirent + reclen;
868 buf->current_dir = dirent;
869 buf->count -= reclen;
870 return 0;
871 efault:
872 buf->error = -EFAULT;
873 return -EFAULT;
874 }
875
876 COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
877 struct compat_linux_dirent __user *, dirent, unsigned int, count)
878 {
879 struct fd f;
880 struct compat_linux_dirent __user * lastdirent;
881 struct compat_getdents_callback buf = {
882 .ctx.actor = compat_filldir,
883 .current_dir = dirent,
884 .count = count
885 };
886 int error;
887
888 if (!access_ok(VERIFY_WRITE, dirent, count))
889 return -EFAULT;
890
891 f = fdget_pos(fd);
892 if (!f.file)
893 return -EBADF;
894
895 error = iterate_dir(f.file, &buf.ctx);
896 if (error >= 0)
897 error = buf.error;
898 lastdirent = buf.previous;
899 if (lastdirent) {
900 if (put_user(buf.ctx.pos, &lastdirent->d_off))
901 error = -EFAULT;
902 else
903 error = count - buf.count;
904 }
905 fdput_pos(f);
906 return error;
907 }
908
909 #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
910
911 struct compat_getdents_callback64 {
912 struct dir_context ctx;
913 struct linux_dirent64 __user *current_dir;
914 struct linux_dirent64 __user *previous;
915 int count;
916 int error;
917 };
918
919 static int compat_filldir64(struct dir_context *ctx, const char *name,
920 int namlen, loff_t offset, u64 ino,
921 unsigned int d_type)
922 {
923 struct linux_dirent64 __user *dirent;
924 struct compat_getdents_callback64 *buf =
925 container_of(ctx, struct compat_getdents_callback64, ctx);
926 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
927 sizeof(u64));
928 u64 off;
929
930 buf->error = -EINVAL; /* only used if we fail.. */
931 if (reclen > buf->count)
932 return -EINVAL;
933 dirent = buf->previous;
934
935 if (dirent) {
936 if (signal_pending(current))
937 return -EINTR;
938 if (__put_user_unaligned(offset, &dirent->d_off))
939 goto efault;
940 }
941 dirent = buf->current_dir;
942 if (__put_user_unaligned(ino, &dirent->d_ino))
943 goto efault;
944 off = 0;
945 if (__put_user_unaligned(off, &dirent->d_off))
946 goto efault;
947 if (__put_user(reclen, &dirent->d_reclen))
948 goto efault;
949 if (__put_user(d_type, &dirent->d_type))
950 goto efault;
951 if (copy_to_user(dirent->d_name, name, namlen))
952 goto efault;
953 if (__put_user(0, dirent->d_name + namlen))
954 goto efault;
955 buf->previous = dirent;
956 dirent = (void __user *)dirent + reclen;
957 buf->current_dir = dirent;
958 buf->count -= reclen;
959 return 0;
960 efault:
961 buf->error = -EFAULT;
962 return -EFAULT;
963 }
964
965 COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
966 struct linux_dirent64 __user *, dirent, unsigned int, count)
967 {
968 struct fd f;
969 struct linux_dirent64 __user * lastdirent;
970 struct compat_getdents_callback64 buf = {
971 .ctx.actor = compat_filldir64,
972 .current_dir = dirent,
973 .count = count
974 };
975 int error;
976
977 if (!access_ok(VERIFY_WRITE, dirent, count))
978 return -EFAULT;
979
980 f = fdget_pos(fd);
981 if (!f.file)
982 return -EBADF;
983
984 error = iterate_dir(f.file, &buf.ctx);
985 if (error >= 0)
986 error = buf.error;
987 lastdirent = buf.previous;
988 if (lastdirent) {
989 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
990 if (__put_user_unaligned(d_off, &lastdirent->d_off))
991 error = -EFAULT;
992 else
993 error = count - buf.count;
994 }
995 fdput_pos(f);
996 return error;
997 }
998 #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
999
1000 /*
1001 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1002 * O_LARGEFILE flag.
1003 */
1004 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1005 {
1006 return do_sys_open(AT_FDCWD, filename, flags, mode);
1007 }
1008
1009 /*
1010 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1011 * O_LARGEFILE flag.
1012 */
1013 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1014 {
1015 return do_sys_open(dfd, filename, flags, mode);
1016 }
1017
1018 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1019
1020 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1021 int timeval, int ret)
1022 {
1023 struct timespec ts;
1024
1025 if (!p)
1026 return ret;
1027
1028 if (current->personality & STICKY_TIMEOUTS)
1029 goto sticky;
1030
1031 /* No update for zero timeout */
1032 if (!end_time->tv_sec && !end_time->tv_nsec)
1033 return ret;
1034
1035 ktime_get_ts(&ts);
1036 ts = timespec_sub(*end_time, ts);
1037 if (ts.tv_sec < 0)
1038 ts.tv_sec = ts.tv_nsec = 0;
1039
1040 if (timeval) {
1041 struct compat_timeval rtv;
1042
1043 rtv.tv_sec = ts.tv_sec;
1044 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1045
1046 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1047 return ret;
1048 } else {
1049 struct compat_timespec rts;
1050
1051 rts.tv_sec = ts.tv_sec;
1052 rts.tv_nsec = ts.tv_nsec;
1053
1054 if (!copy_to_user(p, &rts, sizeof(rts)))
1055 return ret;
1056 }
1057 /*
1058 * If an application puts its timeval in read-only memory, we
1059 * don't want the Linux-specific update to the timeval to
1060 * cause a fault after the select has completed
1061 * successfully. However, because we're not updating the
1062 * timeval, we can't restart the system call.
1063 */
1064
1065 sticky:
1066 if (ret == -ERESTARTNOHAND)
1067 ret = -EINTR;
1068 return ret;
1069 }
1070
1071 /*
1072 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1073 * 64-bit unsigned longs.
1074 */
1075 static
1076 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1077 unsigned long *fdset)
1078 {
1079 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1080 if (ufdset) {
1081 unsigned long odd;
1082
1083 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1084 return -EFAULT;
1085
1086 odd = nr & 1UL;
1087 nr &= ~1UL;
1088 while (nr) {
1089 unsigned long h, l;
1090 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1091 return -EFAULT;
1092 ufdset += 2;
1093 *fdset++ = h << 32 | l;
1094 nr -= 2;
1095 }
1096 if (odd && __get_user(*fdset, ufdset))
1097 return -EFAULT;
1098 } else {
1099 /* Tricky, must clear full unsigned long in the
1100 * kernel fdset at the end, this makes sure that
1101 * actually happens.
1102 */
1103 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1104 }
1105 return 0;
1106 }
1107
1108 static
1109 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1110 unsigned long *fdset)
1111 {
1112 unsigned long odd;
1113 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1114
1115 if (!ufdset)
1116 return 0;
1117
1118 odd = nr & 1UL;
1119 nr &= ~1UL;
1120 while (nr) {
1121 unsigned long h, l;
1122 l = *fdset++;
1123 h = l >> 32;
1124 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1125 return -EFAULT;
1126 ufdset += 2;
1127 nr -= 2;
1128 }
1129 if (odd && __put_user(*fdset, ufdset))
1130 return -EFAULT;
1131 return 0;
1132 }
1133
1134
1135 /*
1136 * This is a virtual copy of sys_select from fs/select.c and probably
1137 * should be compared to it from time to time
1138 */
1139
1140 /*
1141 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1142 * like to be certain this leads to no problems. So I return
1143 * EINTR just for safety.
1144 *
1145 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1146 * I'm trying ERESTARTNOHAND which restart only when you want to.
1147 */
1148 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1149 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1150 struct timespec *end_time)
1151 {
1152 fd_set_bits fds;
1153 void *bits;
1154 int size, max_fds, ret = -EINVAL;
1155 struct fdtable *fdt;
1156 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1157
1158 if (n < 0)
1159 goto out_nofds;
1160
1161 /* max_fds can increase, so grab it once to avoid race */
1162 rcu_read_lock();
1163 fdt = files_fdtable(current->files);
1164 max_fds = fdt->max_fds;
1165 rcu_read_unlock();
1166 if (n > max_fds)
1167 n = max_fds;
1168
1169 /*
1170 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1171 * since we used fdset we need to allocate memory in units of
1172 * long-words.
1173 */
1174 size = FDS_BYTES(n);
1175 bits = stack_fds;
1176 if (size > sizeof(stack_fds) / 6) {
1177 bits = kmalloc(6 * size, GFP_KERNEL);
1178 ret = -ENOMEM;
1179 if (!bits)
1180 goto out_nofds;
1181 }
1182 fds.in = (unsigned long *) bits;
1183 fds.out = (unsigned long *) (bits + size);
1184 fds.ex = (unsigned long *) (bits + 2*size);
1185 fds.res_in = (unsigned long *) (bits + 3*size);
1186 fds.res_out = (unsigned long *) (bits + 4*size);
1187 fds.res_ex = (unsigned long *) (bits + 5*size);
1188
1189 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1190 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1191 (ret = compat_get_fd_set(n, exp, fds.ex)))
1192 goto out;
1193 zero_fd_set(n, fds.res_in);
1194 zero_fd_set(n, fds.res_out);
1195 zero_fd_set(n, fds.res_ex);
1196
1197 ret = do_select(n, &fds, end_time);
1198
1199 if (ret < 0)
1200 goto out;
1201 if (!ret) {
1202 ret = -ERESTARTNOHAND;
1203 if (signal_pending(current))
1204 goto out;
1205 ret = 0;
1206 }
1207
1208 if (compat_set_fd_set(n, inp, fds.res_in) ||
1209 compat_set_fd_set(n, outp, fds.res_out) ||
1210 compat_set_fd_set(n, exp, fds.res_ex))
1211 ret = -EFAULT;
1212 out:
1213 if (bits != stack_fds)
1214 kfree(bits);
1215 out_nofds:
1216 return ret;
1217 }
1218
1219 COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1220 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1221 struct compat_timeval __user *, tvp)
1222 {
1223 struct timespec end_time, *to = NULL;
1224 struct compat_timeval tv;
1225 int ret;
1226
1227 if (tvp) {
1228 if (copy_from_user(&tv, tvp, sizeof(tv)))
1229 return -EFAULT;
1230
1231 to = &end_time;
1232 if (poll_select_set_timeout(to,
1233 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1234 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1235 return -EINVAL;
1236 }
1237
1238 ret = compat_core_sys_select(n, inp, outp, exp, to);
1239 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1240
1241 return ret;
1242 }
1243
1244 struct compat_sel_arg_struct {
1245 compat_ulong_t n;
1246 compat_uptr_t inp;
1247 compat_uptr_t outp;
1248 compat_uptr_t exp;
1249 compat_uptr_t tvp;
1250 };
1251
1252 COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
1253 {
1254 struct compat_sel_arg_struct a;
1255
1256 if (copy_from_user(&a, arg, sizeof(a)))
1257 return -EFAULT;
1258 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1259 compat_ptr(a.exp), compat_ptr(a.tvp));
1260 }
1261
1262 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1263 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1264 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1265 compat_size_t sigsetsize)
1266 {
1267 compat_sigset_t ss32;
1268 sigset_t ksigmask, sigsaved;
1269 struct compat_timespec ts;
1270 struct timespec end_time, *to = NULL;
1271 int ret;
1272
1273 if (tsp) {
1274 if (copy_from_user(&ts, tsp, sizeof(ts)))
1275 return -EFAULT;
1276
1277 to = &end_time;
1278 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1279 return -EINVAL;
1280 }
1281
1282 if (sigmask) {
1283 if (sigsetsize != sizeof(compat_sigset_t))
1284 return -EINVAL;
1285 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1286 return -EFAULT;
1287 sigset_from_compat(&ksigmask, &ss32);
1288
1289 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1290 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1291 }
1292
1293 ret = compat_core_sys_select(n, inp, outp, exp, to);
1294 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1295
1296 if (ret == -ERESTARTNOHAND) {
1297 /*
1298 * Don't restore the signal mask yet. Let do_signal() deliver
1299 * the signal on the way back to userspace, before the signal
1300 * mask is restored.
1301 */
1302 if (sigmask) {
1303 memcpy(&current->saved_sigmask, &sigsaved,
1304 sizeof(sigsaved));
1305 set_restore_sigmask();
1306 }
1307 } else if (sigmask)
1308 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1309
1310 return ret;
1311 }
1312
1313 COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1314 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1315 struct compat_timespec __user *, tsp, void __user *, sig)
1316 {
1317 compat_size_t sigsetsize = 0;
1318 compat_uptr_t up = 0;
1319
1320 if (sig) {
1321 if (!access_ok(VERIFY_READ, sig,
1322 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1323 __get_user(up, (compat_uptr_t __user *)sig) ||
1324 __get_user(sigsetsize,
1325 (compat_size_t __user *)(sig+sizeof(up))))
1326 return -EFAULT;
1327 }
1328 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1329 sigsetsize);
1330 }
1331
1332 COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1333 unsigned int, nfds, struct compat_timespec __user *, tsp,
1334 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
1335 {
1336 compat_sigset_t ss32;
1337 sigset_t ksigmask, sigsaved;
1338 struct compat_timespec ts;
1339 struct timespec end_time, *to = NULL;
1340 int ret;
1341
1342 if (tsp) {
1343 if (copy_from_user(&ts, tsp, sizeof(ts)))
1344 return -EFAULT;
1345
1346 to = &end_time;
1347 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1348 return -EINVAL;
1349 }
1350
1351 if (sigmask) {
1352 if (sigsetsize != sizeof(compat_sigset_t))
1353 return -EINVAL;
1354 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1355 return -EFAULT;
1356 sigset_from_compat(&ksigmask, &ss32);
1357
1358 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1359 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1360 }
1361
1362 ret = do_sys_poll(ufds, nfds, to);
1363
1364 /* We can restart this syscall, usually */
1365 if (ret == -EINTR) {
1366 /*
1367 * Don't restore the signal mask yet. Let do_signal() deliver
1368 * the signal on the way back to userspace, before the signal
1369 * mask is restored.
1370 */
1371 if (sigmask) {
1372 memcpy(&current->saved_sigmask, &sigsaved,
1373 sizeof(sigsaved));
1374 set_restore_sigmask();
1375 }
1376 ret = -ERESTARTNOHAND;
1377 } else if (sigmask)
1378 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1379
1380 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1381
1382 return ret;
1383 }
1384
1385 #ifdef CONFIG_FHANDLE
1386 /*
1387 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1388 * doesn't set the O_LARGEFILE flag.
1389 */
1390 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1391 struct file_handle __user *, handle, int, flags)
1392 {
1393 return do_handle_open(mountdirfd, handle, flags);
1394 }
1395 #endif
Linux with added FPC-III support