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x86: hpet: provide separate functions to stop and start the counter
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / compat.c
blob1df89264c66f79ba14d80181e85d2b7f9793970a
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@suse.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/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/smp_lock.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/nfsd/nfsd.h>
44 #include <linux/nfsd/syscall.h>
45 #include <linux/personality.h>
46 #include <linux/rwsem.h>
47 #include <linux/tsacct_kern.h>
48 #include <linux/security.h>
49 #include <linux/highmem.h>
50 #include <linux/signal.h>
51 #include <linux/poll.h>
52 #include <linux/mm.h>
53 #include <linux/eventpoll.h>
54 #include <linux/fs_struct.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/mmu_context.h>
58 #include <asm/ioctls.h>
59 #include "internal.h"
60
61 int compat_log = 1;
62
63 int compat_printk(const char *fmt, ...)
64 {
65 va_list ap;
66 int ret;
67 if (!compat_log)
68 return 0;
69 va_start(ap, fmt);
70 ret = vprintk(fmt, ap);
71 va_end(ap);
72 return ret;
73 }
74
75 #include "read_write.h"
76
77 /*
78 * Not all architectures have sys_utime, so implement this in terms
79 * of sys_utimes.
80 */
81 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
82 {
83 struct timespec tv[2];
84
85 if (t) {
86 if (get_user(tv[0].tv_sec, &t->actime) ||
87 get_user(tv[1].tv_sec, &t->modtime))
88 return -EFAULT;
89 tv[0].tv_nsec = 0;
90 tv[1].tv_nsec = 0;
91 }
92 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
93 }
94
95 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
96 {
97 struct timespec tv[2];
98
99 if (t) {
100 if (get_compat_timespec(&tv[0], &t[0]) ||
101 get_compat_timespec(&tv[1], &t[1]))
102 return -EFAULT;
103
104 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
105 && tv[0].tv_sec != 0)
106 return -EINVAL;
107 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
108 && tv[1].tv_sec != 0)
109 return -EINVAL;
110
111 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
112 return 0;
113 }
114 return do_utimes(dfd, filename, t ? tv : NULL, flags);
115 }
116
117 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
118 {
119 struct timespec tv[2];
120
121 if (t) {
122 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
123 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
124 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
125 get_user(tv[1].tv_nsec, &t[1].tv_usec))
126 return -EFAULT;
127 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
128 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
129 return -EINVAL;
130 tv[0].tv_nsec *= 1000;
131 tv[1].tv_nsec *= 1000;
132 }
133 return do_utimes(dfd, filename, t ? tv : NULL, 0);
134 }
135
136 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
137 {
138 return compat_sys_futimesat(AT_FDCWD, filename, t);
139 }
140
141 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
142 {
143 compat_ino_t ino = stat->ino;
144 typeof(ubuf->st_uid) uid = 0;
145 typeof(ubuf->st_gid) gid = 0;
146 int err;
147
148 SET_UID(uid, stat->uid);
149 SET_GID(gid, stat->gid);
150
151 if ((u64) stat->size > MAX_NON_LFS ||
152 !old_valid_dev(stat->dev) ||
153 !old_valid_dev(stat->rdev))
154 return -EOVERFLOW;
155 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
156 return -EOVERFLOW;
157
158 if (clear_user(ubuf, sizeof(*ubuf)))
159 return -EFAULT;
160
161 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
162 err |= __put_user(ino, &ubuf->st_ino);
163 err |= __put_user(stat->mode, &ubuf->st_mode);
164 err |= __put_user(stat->nlink, &ubuf->st_nlink);
165 err |= __put_user(uid, &ubuf->st_uid);
166 err |= __put_user(gid, &ubuf->st_gid);
167 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
168 err |= __put_user(stat->size, &ubuf->st_size);
169 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
170 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
171 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
172 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
173 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
174 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
175 err |= __put_user(stat->blksize, &ubuf->st_blksize);
176 err |= __put_user(stat->blocks, &ubuf->st_blocks);
177 return err;
178 }
179
180 asmlinkage long compat_sys_newstat(char __user * filename,
181 struct compat_stat __user *statbuf)
182 {
183 struct kstat stat;
184 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
185
186 if (!error)
187 error = cp_compat_stat(&stat, statbuf);
188 return error;
189 }
190
191 asmlinkage long compat_sys_newlstat(char __user * filename,
192 struct compat_stat __user *statbuf)
193 {
194 struct kstat stat;
195 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
196
197 if (!error)
198 error = cp_compat_stat(&stat, statbuf);
199 return error;
200 }
201
202 #ifndef __ARCH_WANT_STAT64
203 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
204 struct compat_stat __user *statbuf, int flag)
205 {
206 struct kstat stat;
207 int error = -EINVAL;
208
209 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
210 goto out;
211
212 if (flag & AT_SYMLINK_NOFOLLOW)
213 error = vfs_lstat_fd(dfd, filename, &stat);
214 else
215 error = vfs_stat_fd(dfd, filename, &stat);
216
217 if (!error)
218 error = cp_compat_stat(&stat, statbuf);
219
220 out:
221 return error;
222 }
223 #endif
224
225 asmlinkage long compat_sys_newfstat(unsigned int fd,
226 struct compat_stat __user * statbuf)
227 {
228 struct kstat stat;
229 int error = vfs_fstat(fd, &stat);
230
231 if (!error)
232 error = cp_compat_stat(&stat, statbuf);
233 return error;
234 }
235
236 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
237 {
238
239 if (sizeof ubuf->f_blocks == 4) {
240 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
241 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
242 return -EOVERFLOW;
243 /* f_files and f_ffree may be -1; it's okay
244 * to stuff that into 32 bits */
245 if (kbuf->f_files != 0xffffffffffffffffULL
246 && (kbuf->f_files & 0xffffffff00000000ULL))
247 return -EOVERFLOW;
248 if (kbuf->f_ffree != 0xffffffffffffffffULL
249 && (kbuf->f_ffree & 0xffffffff00000000ULL))
250 return -EOVERFLOW;
251 }
252 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
253 __put_user(kbuf->f_type, &ubuf->f_type) ||
254 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
255 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
256 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
257 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
258 __put_user(kbuf->f_files, &ubuf->f_files) ||
259 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
260 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
261 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
262 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
263 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
264 __put_user(0, &ubuf->f_spare[0]) ||
265 __put_user(0, &ubuf->f_spare[1]) ||
266 __put_user(0, &ubuf->f_spare[2]) ||
267 __put_user(0, &ubuf->f_spare[3]) ||
268 __put_user(0, &ubuf->f_spare[4]))
269 return -EFAULT;
270 return 0;
271 }
272
273 /*
274 * The following statfs calls are copies of code from fs/open.c and
275 * should be checked against those from time to time
276 */
277 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
278 {
279 struct path path;
280 int error;
281
282 error = user_path(pathname, &path);
283 if (!error) {
284 struct kstatfs tmp;
285 error = vfs_statfs(path.dentry, &tmp);
286 if (!error)
287 error = put_compat_statfs(buf, &tmp);
288 path_put(&path);
289 }
290 return error;
291 }
292
293 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
294 {
295 struct file * file;
296 struct kstatfs tmp;
297 int error;
298
299 error = -EBADF;
300 file = fget(fd);
301 if (!file)
302 goto out;
303 error = vfs_statfs(file->f_path.dentry, &tmp);
304 if (!error)
305 error = put_compat_statfs(buf, &tmp);
306 fput(file);
307 out:
308 return error;
309 }
310
311 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
312 {
313 if (sizeof ubuf->f_blocks == 4) {
314 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
315 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
316 return -EOVERFLOW;
317 /* f_files and f_ffree may be -1; it's okay
318 * to stuff that into 32 bits */
319 if (kbuf->f_files != 0xffffffffffffffffULL
320 && (kbuf->f_files & 0xffffffff00000000ULL))
321 return -EOVERFLOW;
322 if (kbuf->f_ffree != 0xffffffffffffffffULL
323 && (kbuf->f_ffree & 0xffffffff00000000ULL))
324 return -EOVERFLOW;
325 }
326 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
327 __put_user(kbuf->f_type, &ubuf->f_type) ||
328 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
329 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
330 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
331 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
332 __put_user(kbuf->f_files, &ubuf->f_files) ||
333 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
334 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
335 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
336 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
337 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
338 return -EFAULT;
339 return 0;
340 }
341
342 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
343 {
344 struct path path;
345 int error;
346
347 if (sz != sizeof(*buf))
348 return -EINVAL;
349
350 error = user_path(pathname, &path);
351 if (!error) {
352 struct kstatfs tmp;
353 error = vfs_statfs(path.dentry, &tmp);
354 if (!error)
355 error = put_compat_statfs64(buf, &tmp);
356 path_put(&path);
357 }
358 return error;
359 }
360
361 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
362 {
363 struct file * file;
364 struct kstatfs tmp;
365 int error;
366
367 if (sz != sizeof(*buf))
368 return -EINVAL;
369
370 error = -EBADF;
371 file = fget(fd);
372 if (!file)
373 goto out;
374 error = vfs_statfs(file->f_path.dentry, &tmp);
375 if (!error)
376 error = put_compat_statfs64(buf, &tmp);
377 fput(file);
378 out:
379 return error;
380 }
381
382 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
383 {
384 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
385 __get_user(kfl->l_type, &ufl->l_type) ||
386 __get_user(kfl->l_whence, &ufl->l_whence) ||
387 __get_user(kfl->l_start, &ufl->l_start) ||
388 __get_user(kfl->l_len, &ufl->l_len) ||
389 __get_user(kfl->l_pid, &ufl->l_pid))
390 return -EFAULT;
391 return 0;
392 }
393
394 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
395 {
396 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
397 __put_user(kfl->l_type, &ufl->l_type) ||
398 __put_user(kfl->l_whence, &ufl->l_whence) ||
399 __put_user(kfl->l_start, &ufl->l_start) ||
400 __put_user(kfl->l_len, &ufl->l_len) ||
401 __put_user(kfl->l_pid, &ufl->l_pid))
402 return -EFAULT;
403 return 0;
404 }
405
406 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
407 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
408 {
409 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
410 __get_user(kfl->l_type, &ufl->l_type) ||
411 __get_user(kfl->l_whence, &ufl->l_whence) ||
412 __get_user(kfl->l_start, &ufl->l_start) ||
413 __get_user(kfl->l_len, &ufl->l_len) ||
414 __get_user(kfl->l_pid, &ufl->l_pid))
415 return -EFAULT;
416 return 0;
417 }
418 #endif
419
420 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
421 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
422 {
423 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
424 __put_user(kfl->l_type, &ufl->l_type) ||
425 __put_user(kfl->l_whence, &ufl->l_whence) ||
426 __put_user(kfl->l_start, &ufl->l_start) ||
427 __put_user(kfl->l_len, &ufl->l_len) ||
428 __put_user(kfl->l_pid, &ufl->l_pid))
429 return -EFAULT;
430 return 0;
431 }
432 #endif
433
434 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
435 unsigned long arg)
436 {
437 mm_segment_t old_fs;
438 struct flock f;
439 long ret;
440
441 switch (cmd) {
442 case F_GETLK:
443 case F_SETLK:
444 case F_SETLKW:
445 ret = get_compat_flock(&f, compat_ptr(arg));
446 if (ret != 0)
447 break;
448 old_fs = get_fs();
449 set_fs(KERNEL_DS);
450 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
451 set_fs(old_fs);
452 if (cmd == F_GETLK && ret == 0) {
453 /* GETLK was successfule and we need to return the data...
454 * but it needs to fit in the compat structure.
455 * l_start shouldn't be too big, unless the original
456 * start + end is greater than COMPAT_OFF_T_MAX, in which
457 * case the app was asking for trouble, so we return
458 * -EOVERFLOW in that case.
459 * l_len could be too big, in which case we just truncate it,
460 * and only allow the app to see that part of the conflicting
461 * lock that might make sense to it anyway
462 */
463
464 if (f.l_start > COMPAT_OFF_T_MAX)
465 ret = -EOVERFLOW;
466 if (f.l_len > COMPAT_OFF_T_MAX)
467 f.l_len = COMPAT_OFF_T_MAX;
468 if (ret == 0)
469 ret = put_compat_flock(&f, compat_ptr(arg));
470 }
471 break;
472
473 case F_GETLK64:
474 case F_SETLK64:
475 case F_SETLKW64:
476 ret = get_compat_flock64(&f, compat_ptr(arg));
477 if (ret != 0)
478 break;
479 old_fs = get_fs();
480 set_fs(KERNEL_DS);
481 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
482 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
483 (unsigned long)&f);
484 set_fs(old_fs);
485 if (cmd == F_GETLK64 && ret == 0) {
486 /* need to return lock information - see above for commentary */
487 if (f.l_start > COMPAT_LOFF_T_MAX)
488 ret = -EOVERFLOW;
489 if (f.l_len > COMPAT_LOFF_T_MAX)
490 f.l_len = COMPAT_LOFF_T_MAX;
491 if (ret == 0)
492 ret = put_compat_flock64(&f, compat_ptr(arg));
493 }
494 break;
495
496 default:
497 ret = sys_fcntl(fd, cmd, arg);
498 break;
499 }
500 return ret;
501 }
502
503 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
504 unsigned long arg)
505 {
506 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
507 return -EINVAL;
508 return compat_sys_fcntl64(fd, cmd, arg);
509 }
510
511 asmlinkage long
512 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
513 {
514 long ret;
515 aio_context_t ctx64;
516
517 mm_segment_t oldfs = get_fs();
518 if (unlikely(get_user(ctx64, ctx32p)))
519 return -EFAULT;
520
521 set_fs(KERNEL_DS);
522 /* The __user pointer cast is valid because of the set_fs() */
523 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
524 set_fs(oldfs);
525 /* truncating is ok because it's a user address */
526 if (!ret)
527 ret = put_user((u32) ctx64, ctx32p);
528 return ret;
529 }
530
531 asmlinkage long
532 compat_sys_io_getevents(aio_context_t ctx_id,
533 unsigned long min_nr,
534 unsigned long nr,
535 struct io_event __user *events,
536 struct compat_timespec __user *timeout)
537 {
538 long ret;
539 struct timespec t;
540 struct timespec __user *ut = NULL;
541
542 ret = -EFAULT;
543 if (unlikely(!access_ok(VERIFY_WRITE, events,
544 nr * sizeof(struct io_event))))
545 goto out;
546 if (timeout) {
547 if (get_compat_timespec(&t, timeout))
548 goto out;
549
550 ut = compat_alloc_user_space(sizeof(*ut));
551 if (copy_to_user(ut, &t, sizeof(t)) )
552 goto out;
553 }
554 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
555 out:
556 return ret;
557 }
558
559 static inline long
560 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
561 {
562 compat_uptr_t uptr;
563 int i;
564
565 for (i = 0; i < nr; ++i) {
566 if (get_user(uptr, ptr32 + i))
567 return -EFAULT;
568 if (put_user(compat_ptr(uptr), ptr64 + i))
569 return -EFAULT;
570 }
571 return 0;
572 }
573
574 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
575
576 asmlinkage long
577 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
578 {
579 struct iocb __user * __user *iocb64;
580 long ret;
581
582 if (unlikely(nr < 0))
583 return -EINVAL;
584
585 if (nr > MAX_AIO_SUBMITS)
586 nr = MAX_AIO_SUBMITS;
587
588 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
589 ret = copy_iocb(nr, iocb, iocb64);
590 if (!ret)
591 ret = sys_io_submit(ctx_id, nr, iocb64);
592 return ret;
593 }
594
595 struct compat_ncp_mount_data {
596 compat_int_t version;
597 compat_uint_t ncp_fd;
598 __compat_uid_t mounted_uid;
599 compat_pid_t wdog_pid;
600 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
601 compat_uint_t time_out;
602 compat_uint_t retry_count;
603 compat_uint_t flags;
604 __compat_uid_t uid;
605 __compat_gid_t gid;
606 compat_mode_t file_mode;
607 compat_mode_t dir_mode;
608 };
609
610 struct compat_ncp_mount_data_v4 {
611 compat_int_t version;
612 compat_ulong_t flags;
613 compat_ulong_t mounted_uid;
614 compat_long_t wdog_pid;
615 compat_uint_t ncp_fd;
616 compat_uint_t time_out;
617 compat_uint_t retry_count;
618 compat_ulong_t uid;
619 compat_ulong_t gid;
620 compat_ulong_t file_mode;
621 compat_ulong_t dir_mode;
622 };
623
624 static void *do_ncp_super_data_conv(void *raw_data)
625 {
626 int version = *(unsigned int *)raw_data;
627
628 if (version == 3) {
629 struct compat_ncp_mount_data *c_n = raw_data;
630 struct ncp_mount_data *n = raw_data;
631
632 n->dir_mode = c_n->dir_mode;
633 n->file_mode = c_n->file_mode;
634 n->gid = c_n->gid;
635 n->uid = c_n->uid;
636 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
637 n->wdog_pid = c_n->wdog_pid;
638 n->mounted_uid = c_n->mounted_uid;
639 } else if (version == 4) {
640 struct compat_ncp_mount_data_v4 *c_n = raw_data;
641 struct ncp_mount_data_v4 *n = raw_data;
642
643 n->dir_mode = c_n->dir_mode;
644 n->file_mode = c_n->file_mode;
645 n->gid = c_n->gid;
646 n->uid = c_n->uid;
647 n->retry_count = c_n->retry_count;
648 n->time_out = c_n->time_out;
649 n->ncp_fd = c_n->ncp_fd;
650 n->wdog_pid = c_n->wdog_pid;
651 n->mounted_uid = c_n->mounted_uid;
652 n->flags = c_n->flags;
653 } else if (version != 5) {
654 return NULL;
655 }
656
657 return raw_data;
658 }
659
660 struct compat_smb_mount_data {
661 compat_int_t version;
662 __compat_uid_t mounted_uid;
663 __compat_uid_t uid;
664 __compat_gid_t gid;
665 compat_mode_t file_mode;
666 compat_mode_t dir_mode;
667 };
668
669 static void *do_smb_super_data_conv(void *raw_data)
670 {
671 struct smb_mount_data *s = raw_data;
672 struct compat_smb_mount_data *c_s = raw_data;
673
674 if (c_s->version != SMB_MOUNT_OLDVERSION)
675 goto out;
676 s->dir_mode = c_s->dir_mode;
677 s->file_mode = c_s->file_mode;
678 s->gid = c_s->gid;
679 s->uid = c_s->uid;
680 s->mounted_uid = c_s->mounted_uid;
681 out:
682 return raw_data;
683 }
684
685 struct compat_nfs_string {
686 compat_uint_t len;
687 compat_uptr_t data;
688 };
689
690 static inline void compat_nfs_string(struct nfs_string *dst,
691 struct compat_nfs_string *src)
692 {
693 dst->data = compat_ptr(src->data);
694 dst->len = src->len;
695 }
696
697 struct compat_nfs4_mount_data_v1 {
698 compat_int_t version;
699 compat_int_t flags;
700 compat_int_t rsize;
701 compat_int_t wsize;
702 compat_int_t timeo;
703 compat_int_t retrans;
704 compat_int_t acregmin;
705 compat_int_t acregmax;
706 compat_int_t acdirmin;
707 compat_int_t acdirmax;
708 struct compat_nfs_string client_addr;
709 struct compat_nfs_string mnt_path;
710 struct compat_nfs_string hostname;
711 compat_uint_t host_addrlen;
712 compat_uptr_t host_addr;
713 compat_int_t proto;
714 compat_int_t auth_flavourlen;
715 compat_uptr_t auth_flavours;
716 };
717
718 static int do_nfs4_super_data_conv(void *raw_data)
719 {
720 int version = *(compat_uint_t *) raw_data;
721
722 if (version == 1) {
723 struct compat_nfs4_mount_data_v1 *raw = raw_data;
724 struct nfs4_mount_data *real = raw_data;
725
726 /* copy the fields backwards */
727 real->auth_flavours = compat_ptr(raw->auth_flavours);
728 real->auth_flavourlen = raw->auth_flavourlen;
729 real->proto = raw->proto;
730 real->host_addr = compat_ptr(raw->host_addr);
731 real->host_addrlen = raw->host_addrlen;
732 compat_nfs_string(&real->hostname, &raw->hostname);
733 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
734 compat_nfs_string(&real->client_addr, &raw->client_addr);
735 real->acdirmax = raw->acdirmax;
736 real->acdirmin = raw->acdirmin;
737 real->acregmax = raw->acregmax;
738 real->acregmin = raw->acregmin;
739 real->retrans = raw->retrans;
740 real->timeo = raw->timeo;
741 real->wsize = raw->wsize;
742 real->rsize = raw->rsize;
743 real->flags = raw->flags;
744 real->version = raw->version;
745 }
746
747 return 0;
748 }
749
750 #define SMBFS_NAME "smbfs"
751 #define NCPFS_NAME "ncpfs"
752 #define NFS4_NAME "nfs4"
753
754 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
755 char __user * type, unsigned long flags,
756 void __user * data)
757 {
758 unsigned long type_page;
759 unsigned long data_page;
760 unsigned long dev_page;
761 char *dir_page;
762 int retval;
763
764 retval = copy_mount_options (type, &type_page);
765 if (retval < 0)
766 goto out;
767
768 dir_page = getname(dir_name);
769 retval = PTR_ERR(dir_page);
770 if (IS_ERR(dir_page))
771 goto out1;
772
773 retval = copy_mount_options (dev_name, &dev_page);
774 if (retval < 0)
775 goto out2;
776
777 retval = copy_mount_options (data, &data_page);
778 if (retval < 0)
779 goto out3;
780
781 retval = -EINVAL;
782
783 if (type_page && data_page) {
784 if (!strcmp((char *)type_page, SMBFS_NAME)) {
785 do_smb_super_data_conv((void *)data_page);
786 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
787 do_ncp_super_data_conv((void *)data_page);
788 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
789 if (do_nfs4_super_data_conv((void *) data_page))
790 goto out4;
791 }
792 }
793
794 lock_kernel();
795 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
796 flags, (void*)data_page);
797 unlock_kernel();
798
799 out4:
800 free_page(data_page);
801 out3:
802 free_page(dev_page);
803 out2:
804 putname(dir_page);
805 out1:
806 free_page(type_page);
807 out:
808 return retval;
809 }
810
811 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
812
813 struct compat_old_linux_dirent {
814 compat_ulong_t d_ino;
815 compat_ulong_t d_offset;
816 unsigned short d_namlen;
817 char d_name[1];
818 };
819
820 struct compat_readdir_callback {
821 struct compat_old_linux_dirent __user *dirent;
822 int result;
823 };
824
825 static int compat_fillonedir(void *__buf, const char *name, int namlen,
826 loff_t offset, u64 ino, unsigned int d_type)
827 {
828 struct compat_readdir_callback *buf = __buf;
829 struct compat_old_linux_dirent __user *dirent;
830 compat_ulong_t d_ino;
831
832 if (buf->result)
833 return -EINVAL;
834 d_ino = ino;
835 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
836 buf->result = -EOVERFLOW;
837 return -EOVERFLOW;
838 }
839 buf->result++;
840 dirent = buf->dirent;
841 if (!access_ok(VERIFY_WRITE, dirent,
842 (unsigned long)(dirent->d_name + namlen + 1) -
843 (unsigned long)dirent))
844 goto efault;
845 if ( __put_user(d_ino, &dirent->d_ino) ||
846 __put_user(offset, &dirent->d_offset) ||
847 __put_user(namlen, &dirent->d_namlen) ||
848 __copy_to_user(dirent->d_name, name, namlen) ||
849 __put_user(0, dirent->d_name + namlen))
850 goto efault;
851 return 0;
852 efault:
853 buf->result = -EFAULT;
854 return -EFAULT;
855 }
856
857 asmlinkage long compat_sys_old_readdir(unsigned int fd,
858 struct compat_old_linux_dirent __user *dirent, unsigned int count)
859 {
860 int error;
861 struct file *file;
862 struct compat_readdir_callback buf;
863
864 error = -EBADF;
865 file = fget(fd);
866 if (!file)
867 goto out;
868
869 buf.result = 0;
870 buf.dirent = dirent;
871
872 error = vfs_readdir(file, compat_fillonedir, &buf);
873 if (buf.result)
874 error = buf.result;
875
876 fput(file);
877 out:
878 return error;
879 }
880
881 struct compat_linux_dirent {
882 compat_ulong_t d_ino;
883 compat_ulong_t d_off;
884 unsigned short d_reclen;
885 char d_name[1];
886 };
887
888 struct compat_getdents_callback {
889 struct compat_linux_dirent __user *current_dir;
890 struct compat_linux_dirent __user *previous;
891 int count;
892 int error;
893 };
894
895 static int compat_filldir(void *__buf, const char *name, int namlen,
896 loff_t offset, u64 ino, unsigned int d_type)
897 {
898 struct compat_linux_dirent __user * dirent;
899 struct compat_getdents_callback *buf = __buf;
900 compat_ulong_t d_ino;
901 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
902
903 buf->error = -EINVAL; /* only used if we fail.. */
904 if (reclen > buf->count)
905 return -EINVAL;
906 d_ino = ino;
907 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
908 buf->error = -EOVERFLOW;
909 return -EOVERFLOW;
910 }
911 dirent = buf->previous;
912 if (dirent) {
913 if (__put_user(offset, &dirent->d_off))
914 goto efault;
915 }
916 dirent = buf->current_dir;
917 if (__put_user(d_ino, &dirent->d_ino))
918 goto efault;
919 if (__put_user(reclen, &dirent->d_reclen))
920 goto efault;
921 if (copy_to_user(dirent->d_name, name, namlen))
922 goto efault;
923 if (__put_user(0, dirent->d_name + namlen))
924 goto efault;
925 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
926 goto efault;
927 buf->previous = dirent;
928 dirent = (void __user *)dirent + reclen;
929 buf->current_dir = dirent;
930 buf->count -= reclen;
931 return 0;
932 efault:
933 buf->error = -EFAULT;
934 return -EFAULT;
935 }
936
937 asmlinkage long compat_sys_getdents(unsigned int fd,
938 struct compat_linux_dirent __user *dirent, unsigned int count)
939 {
940 struct file * file;
941 struct compat_linux_dirent __user * lastdirent;
942 struct compat_getdents_callback buf;
943 int error;
944
945 error = -EFAULT;
946 if (!access_ok(VERIFY_WRITE, dirent, count))
947 goto out;
948
949 error = -EBADF;
950 file = fget(fd);
951 if (!file)
952 goto out;
953
954 buf.current_dir = dirent;
955 buf.previous = NULL;
956 buf.count = count;
957 buf.error = 0;
958
959 error = vfs_readdir(file, compat_filldir, &buf);
960 if (error >= 0)
961 error = buf.error;
962 lastdirent = buf.previous;
963 if (lastdirent) {
964 if (put_user(file->f_pos, &lastdirent->d_off))
965 error = -EFAULT;
966 else
967 error = count - buf.count;
968 }
969 fput(file);
970 out:
971 return error;
972 }
973
974 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
975
976 struct compat_getdents_callback64 {
977 struct linux_dirent64 __user *current_dir;
978 struct linux_dirent64 __user *previous;
979 int count;
980 int error;
981 };
982
983 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
984 u64 ino, unsigned int d_type)
985 {
986 struct linux_dirent64 __user *dirent;
987 struct compat_getdents_callback64 *buf = __buf;
988 int jj = NAME_OFFSET(dirent);
989 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
990 u64 off;
991
992 buf->error = -EINVAL; /* only used if we fail.. */
993 if (reclen > buf->count)
994 return -EINVAL;
995 dirent = buf->previous;
996
997 if (dirent) {
998 if (__put_user_unaligned(offset, &dirent->d_off))
999 goto efault;
1000 }
1001 dirent = buf->current_dir;
1002 if (__put_user_unaligned(ino, &dirent->d_ino))
1003 goto efault;
1004 off = 0;
1005 if (__put_user_unaligned(off, &dirent->d_off))
1006 goto efault;
1007 if (__put_user(reclen, &dirent->d_reclen))
1008 goto efault;
1009 if (__put_user(d_type, &dirent->d_type))
1010 goto efault;
1011 if (copy_to_user(dirent->d_name, name, namlen))
1012 goto efault;
1013 if (__put_user(0, dirent->d_name + namlen))
1014 goto efault;
1015 buf->previous = dirent;
1016 dirent = (void __user *)dirent + reclen;
1017 buf->current_dir = dirent;
1018 buf->count -= reclen;
1019 return 0;
1020 efault:
1021 buf->error = -EFAULT;
1022 return -EFAULT;
1023 }
1024
1025 asmlinkage long compat_sys_getdents64(unsigned int fd,
1026 struct linux_dirent64 __user * dirent, unsigned int count)
1027 {
1028 struct file * file;
1029 struct linux_dirent64 __user * lastdirent;
1030 struct compat_getdents_callback64 buf;
1031 int error;
1032
1033 error = -EFAULT;
1034 if (!access_ok(VERIFY_WRITE, dirent, count))
1035 goto out;
1036
1037 error = -EBADF;
1038 file = fget(fd);
1039 if (!file)
1040 goto out;
1041
1042 buf.current_dir = dirent;
1043 buf.previous = NULL;
1044 buf.count = count;
1045 buf.error = 0;
1046
1047 error = vfs_readdir(file, compat_filldir64, &buf);
1048 if (error >= 0)
1049 error = buf.error;
1050 lastdirent = buf.previous;
1051 if (lastdirent) {
1052 typeof(lastdirent->d_off) d_off = file->f_pos;
1053 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1054 error = -EFAULT;
1055 else
1056 error = count - buf.count;
1057 }
1058 fput(file);
1059 out:
1060 return error;
1061 }
1062 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1063
1064 static ssize_t compat_do_readv_writev(int type, struct file *file,
1065 const struct compat_iovec __user *uvector,
1066 unsigned long nr_segs, loff_t *pos)
1067 {
1068 compat_ssize_t tot_len;
1069 struct iovec iovstack[UIO_FASTIOV];
1070 struct iovec *iov=iovstack, *vector;
1071 ssize_t ret;
1072 int seg;
1073 io_fn_t fn;
1074 iov_fn_t fnv;
1075
1076 /*
1077 * SuS says "The readv() function *may* fail if the iovcnt argument
1078 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1079 * traditionally returned zero for zero segments, so...
1080 */
1081 ret = 0;
1082 if (nr_segs == 0)
1083 goto out;
1084
1085 /*
1086 * First get the "struct iovec" from user memory and
1087 * verify all the pointers
1088 */
1089 ret = -EINVAL;
1090 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1091 goto out;
1092 if (!file->f_op)
1093 goto out;
1094 if (nr_segs > UIO_FASTIOV) {
1095 ret = -ENOMEM;
1096 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1097 if (!iov)
1098 goto out;
1099 }
1100 ret = -EFAULT;
1101 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1102 goto out;
1103
1104 /*
1105 * Single unix specification:
1106 * We should -EINVAL if an element length is not >= 0 and fitting an
1107 * ssize_t. The total length is fitting an ssize_t
1108 *
1109 * Be careful here because iov_len is a size_t not an ssize_t
1110 */
1111 tot_len = 0;
1112 vector = iov;
1113 ret = -EINVAL;
1114 for (seg = 0 ; seg < nr_segs; seg++) {
1115 compat_ssize_t tmp = tot_len;
1116 compat_ssize_t len;
1117 compat_uptr_t buf;
1118
1119 if (__get_user(len, &uvector->iov_len) ||
1120 __get_user(buf, &uvector->iov_base)) {
1121 ret = -EFAULT;
1122 goto out;
1123 }
1124 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1125 goto out;
1126 tot_len += len;
1127 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1128 goto out;
1129 vector->iov_base = compat_ptr(buf);
1130 vector->iov_len = (compat_size_t) len;
1131 uvector++;
1132 vector++;
1133 }
1134 if (tot_len == 0) {
1135 ret = 0;
1136 goto out;
1137 }
1138
1139 ret = rw_verify_area(type, file, pos, tot_len);
1140 if (ret < 0)
1141 goto out;
1142
1143 fnv = NULL;
1144 if (type == READ) {
1145 fn = file->f_op->read;
1146 fnv = file->f_op->aio_read;
1147 } else {
1148 fn = (io_fn_t)file->f_op->write;
1149 fnv = file->f_op->aio_write;
1150 }
1151
1152 if (fnv)
1153 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1154 pos, fnv);
1155 else
1156 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1157
1158 out:
1159 if (iov != iovstack)
1160 kfree(iov);
1161 if ((ret + (type == READ)) > 0) {
1162 struct dentry *dentry = file->f_path.dentry;
1163 if (type == READ)
1164 fsnotify_access(dentry);
1165 else
1166 fsnotify_modify(dentry);
1167 }
1168 return ret;
1169 }
1170
1171 asmlinkage ssize_t
1172 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1173 {
1174 struct file *file;
1175 ssize_t ret = -EBADF;
1176
1177 file = fget(fd);
1178 if (!file)
1179 return -EBADF;
1180
1181 if (!(file->f_mode & FMODE_READ))
1182 goto out;
1183
1184 ret = -EINVAL;
1185 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1186 goto out;
1187
1188 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1189
1190 out:
1191 if (ret > 0)
1192 add_rchar(current, ret);
1193 inc_syscr(current);
1194 fput(file);
1195 return ret;
1196 }
1197
1198 asmlinkage ssize_t
1199 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1200 {
1201 struct file *file;
1202 ssize_t ret = -EBADF;
1203
1204 file = fget(fd);
1205 if (!file)
1206 return -EBADF;
1207 if (!(file->f_mode & FMODE_WRITE))
1208 goto out;
1209
1210 ret = -EINVAL;
1211 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1212 goto out;
1213
1214 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1215
1216 out:
1217 if (ret > 0)
1218 add_wchar(current, ret);
1219 inc_syscw(current);
1220 fput(file);
1221 return ret;
1222 }
1223
1224 asmlinkage long
1225 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1226 unsigned int nr_segs, unsigned int flags)
1227 {
1228 unsigned i;
1229 struct iovec __user *iov;
1230 if (nr_segs > UIO_MAXIOV)
1231 return -EINVAL;
1232 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1233 for (i = 0; i < nr_segs; i++) {
1234 struct compat_iovec v;
1235 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1236 get_user(v.iov_len, &iov32[i].iov_len) ||
1237 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1238 put_user(v.iov_len, &iov[i].iov_len))
1239 return -EFAULT;
1240 }
1241 return sys_vmsplice(fd, iov, nr_segs, flags);
1242 }
1243
1244 /*
1245 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1246 * O_LARGEFILE flag.
1247 */
1248 asmlinkage long
1249 compat_sys_open(const char __user *filename, int flags, int mode)
1250 {
1251 return do_sys_open(AT_FDCWD, filename, flags, mode);
1252 }
1253
1254 /*
1255 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1256 * O_LARGEFILE flag.
1257 */
1258 asmlinkage long
1259 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1260 {
1261 return do_sys_open(dfd, filename, flags, mode);
1262 }
1263
1264 /*
1265 * compat_count() counts the number of arguments/envelopes. It is basically
1266 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1267 * and envp pointers.
1268 */
1269 static int compat_count(compat_uptr_t __user *argv, int max)
1270 {
1271 int i = 0;
1272
1273 if (argv != NULL) {
1274 for (;;) {
1275 compat_uptr_t p;
1276
1277 if (get_user(p, argv))
1278 return -EFAULT;
1279 if (!p)
1280 break;
1281 argv++;
1282 if (i++ >= max)
1283 return -E2BIG;
1284 }
1285 }
1286 return i;
1287 }
1288
1289 /*
1290 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1291 * except that it works with 32 bit argv and envp pointers.
1292 */
1293 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1294 struct linux_binprm *bprm)
1295 {
1296 struct page *kmapped_page = NULL;
1297 char *kaddr = NULL;
1298 unsigned long kpos = 0;
1299 int ret;
1300
1301 while (argc-- > 0) {
1302 compat_uptr_t str;
1303 int len;
1304 unsigned long pos;
1305
1306 if (get_user(str, argv+argc) ||
1307 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1308 ret = -EFAULT;
1309 goto out;
1310 }
1311
1312 if (len > MAX_ARG_STRLEN) {
1313 ret = -E2BIG;
1314 goto out;
1315 }
1316
1317 /* We're going to work our way backwords. */
1318 pos = bprm->p;
1319 str += len;
1320 bprm->p -= len;
1321
1322 while (len > 0) {
1323 int offset, bytes_to_copy;
1324
1325 offset = pos % PAGE_SIZE;
1326 if (offset == 0)
1327 offset = PAGE_SIZE;
1328
1329 bytes_to_copy = offset;
1330 if (bytes_to_copy > len)
1331 bytes_to_copy = len;
1332
1333 offset -= bytes_to_copy;
1334 pos -= bytes_to_copy;
1335 str -= bytes_to_copy;
1336 len -= bytes_to_copy;
1337
1338 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1339 struct page *page;
1340
1341 #ifdef CONFIG_STACK_GROWSUP
1342 ret = expand_stack_downwards(bprm->vma, pos);
1343 if (ret < 0) {
1344 /* We've exceed the stack rlimit. */
1345 ret = -E2BIG;
1346 goto out;
1347 }
1348 #endif
1349 ret = get_user_pages(current, bprm->mm, pos,
1350 1, 1, 1, &page, NULL);
1351 if (ret <= 0) {
1352 /* We've exceed the stack rlimit. */
1353 ret = -E2BIG;
1354 goto out;
1355 }
1356
1357 if (kmapped_page) {
1358 flush_kernel_dcache_page(kmapped_page);
1359 kunmap(kmapped_page);
1360 put_page(kmapped_page);
1361 }
1362 kmapped_page = page;
1363 kaddr = kmap(kmapped_page);
1364 kpos = pos & PAGE_MASK;
1365 flush_cache_page(bprm->vma, kpos,
1366 page_to_pfn(kmapped_page));
1367 }
1368 if (copy_from_user(kaddr+offset, compat_ptr(str),
1369 bytes_to_copy)) {
1370 ret = -EFAULT;
1371 goto out;
1372 }
1373 }
1374 }
1375 ret = 0;
1376 out:
1377 if (kmapped_page) {
1378 flush_kernel_dcache_page(kmapped_page);
1379 kunmap(kmapped_page);
1380 put_page(kmapped_page);
1381 }
1382 return ret;
1383 }
1384
1385 /*
1386 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1387 * that it processes 32 bit argv and envp pointers.
1388 */
1389 int compat_do_execve(char * filename,
1390 compat_uptr_t __user *argv,
1391 compat_uptr_t __user *envp,
1392 struct pt_regs * regs)
1393 {
1394 struct linux_binprm *bprm;
1395 struct file *file;
1396 struct files_struct *displaced;
1397 bool clear_in_exec;
1398 int retval;
1399
1400 retval = unshare_files(&displaced);
1401 if (retval)
1402 goto out_ret;
1403
1404 retval = -ENOMEM;
1405 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1406 if (!bprm)
1407 goto out_files;
1408
1409 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
1410 if (retval < 0)
1411 goto out_free;
1412
1413 retval = -ENOMEM;
1414 bprm->cred = prepare_exec_creds();
1415 if (!bprm->cred)
1416 goto out_unlock;
1417
1418 retval = check_unsafe_exec(bprm);
1419 if (retval < 0)
1420 goto out_unlock;
1421 clear_in_exec = retval;
1422
1423 file = open_exec(filename);
1424 retval = PTR_ERR(file);
1425 if (IS_ERR(file))
1426 goto out_unmark;
1427
1428 sched_exec();
1429
1430 bprm->file = file;
1431 bprm->filename = filename;
1432 bprm->interp = filename;
1433
1434 retval = bprm_mm_init(bprm);
1435 if (retval)
1436 goto out_file;
1437
1438 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1439 if ((retval = bprm->argc) < 0)
1440 goto out;
1441
1442 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1443 if ((retval = bprm->envc) < 0)
1444 goto out;
1445
1446 retval = prepare_binprm(bprm);
1447 if (retval < 0)
1448 goto out;
1449
1450 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1451 if (retval < 0)
1452 goto out;
1453
1454 bprm->exec = bprm->p;
1455 retval = compat_copy_strings(bprm->envc, envp, bprm);
1456 if (retval < 0)
1457 goto out;
1458
1459 retval = compat_copy_strings(bprm->argc, argv, bprm);
1460 if (retval < 0)
1461 goto out;
1462
1463 retval = search_binary_handler(bprm, regs);
1464 if (retval < 0)
1465 goto out;
1466
1467 /* execve succeeded */
1468 current->fs->in_exec = 0;
1469 mutex_unlock(&current->cred_exec_mutex);
1470 acct_update_integrals(current);
1471 free_bprm(bprm);
1472 if (displaced)
1473 put_files_struct(displaced);
1474 return retval;
1475
1476 out:
1477 if (bprm->mm)
1478 mmput(bprm->mm);
1479
1480 out_file:
1481 if (bprm->file) {
1482 allow_write_access(bprm->file);
1483 fput(bprm->file);
1484 }
1485
1486 out_unmark:
1487 if (clear_in_exec)
1488 current->fs->in_exec = 0;
1489
1490 out_unlock:
1491 mutex_unlock(&current->cred_exec_mutex);
1492
1493 out_free:
1494 free_bprm(bprm);
1495
1496 out_files:
1497 if (displaced)
1498 reset_files_struct(displaced);
1499 out_ret:
1500 return retval;
1501 }
1502
1503 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1504
1505 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1506 int timeval, int ret)
1507 {
1508 struct timespec ts;
1509
1510 if (!p)
1511 return ret;
1512
1513 if (current->personality & STICKY_TIMEOUTS)
1514 goto sticky;
1515
1516 /* No update for zero timeout */
1517 if (!end_time->tv_sec && !end_time->tv_nsec)
1518 return ret;
1519
1520 ktime_get_ts(&ts);
1521 ts = timespec_sub(*end_time, ts);
1522 if (ts.tv_sec < 0)
1523 ts.tv_sec = ts.tv_nsec = 0;
1524
1525 if (timeval) {
1526 struct compat_timeval rtv;
1527
1528 rtv.tv_sec = ts.tv_sec;
1529 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1530
1531 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1532 return ret;
1533 } else {
1534 struct compat_timespec rts;
1535
1536 rts.tv_sec = ts.tv_sec;
1537 rts.tv_nsec = ts.tv_nsec;
1538
1539 if (!copy_to_user(p, &rts, sizeof(rts)))
1540 return ret;
1541 }
1542 /*
1543 * If an application puts its timeval in read-only memory, we
1544 * don't want the Linux-specific update to the timeval to
1545 * cause a fault after the select has completed
1546 * successfully. However, because we're not updating the
1547 * timeval, we can't restart the system call.
1548 */
1549
1550 sticky:
1551 if (ret == -ERESTARTNOHAND)
1552 ret = -EINTR;
1553 return ret;
1554 }
1555
1556 /*
1557 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1558 * 64-bit unsigned longs.
1559 */
1560 static
1561 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1562 unsigned long *fdset)
1563 {
1564 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1565 if (ufdset) {
1566 unsigned long odd;
1567
1568 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1569 return -EFAULT;
1570
1571 odd = nr & 1UL;
1572 nr &= ~1UL;
1573 while (nr) {
1574 unsigned long h, l;
1575 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1576 return -EFAULT;
1577 ufdset += 2;
1578 *fdset++ = h << 32 | l;
1579 nr -= 2;
1580 }
1581 if (odd && __get_user(*fdset, ufdset))
1582 return -EFAULT;
1583 } else {
1584 /* Tricky, must clear full unsigned long in the
1585 * kernel fdset at the end, this makes sure that
1586 * actually happens.
1587 */
1588 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1589 }
1590 return 0;
1591 }
1592
1593 static
1594 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1595 unsigned long *fdset)
1596 {
1597 unsigned long odd;
1598 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1599
1600 if (!ufdset)
1601 return 0;
1602
1603 odd = nr & 1UL;
1604 nr &= ~1UL;
1605 while (nr) {
1606 unsigned long h, l;
1607 l = *fdset++;
1608 h = l >> 32;
1609 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1610 return -EFAULT;
1611 ufdset += 2;
1612 nr -= 2;
1613 }
1614 if (odd && __put_user(*fdset, ufdset))
1615 return -EFAULT;
1616 return 0;
1617 }
1618
1619
1620 /*
1621 * This is a virtual copy of sys_select from fs/select.c and probably
1622 * should be compared to it from time to time
1623 */
1624
1625 /*
1626 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1627 * like to be certain this leads to no problems. So I return
1628 * EINTR just for safety.
1629 *
1630 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1631 * I'm trying ERESTARTNOHAND which restart only when you want to.
1632 */
1633 #define MAX_SELECT_SECONDS \
1634 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1635
1636 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1637 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1638 struct timespec *end_time)
1639 {
1640 fd_set_bits fds;
1641 void *bits;
1642 int size, max_fds, ret = -EINVAL;
1643 struct fdtable *fdt;
1644 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1645
1646 if (n < 0)
1647 goto out_nofds;
1648
1649 /* max_fds can increase, so grab it once to avoid race */
1650 rcu_read_lock();
1651 fdt = files_fdtable(current->files);
1652 max_fds = fdt->max_fds;
1653 rcu_read_unlock();
1654 if (n > max_fds)
1655 n = max_fds;
1656
1657 /*
1658 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1659 * since we used fdset we need to allocate memory in units of
1660 * long-words.
1661 */
1662 size = FDS_BYTES(n);
1663 bits = stack_fds;
1664 if (size > sizeof(stack_fds) / 6) {
1665 bits = kmalloc(6 * size, GFP_KERNEL);
1666 ret = -ENOMEM;
1667 if (!bits)
1668 goto out_nofds;
1669 }
1670 fds.in = (unsigned long *) bits;
1671 fds.out = (unsigned long *) (bits + size);
1672 fds.ex = (unsigned long *) (bits + 2*size);
1673 fds.res_in = (unsigned long *) (bits + 3*size);
1674 fds.res_out = (unsigned long *) (bits + 4*size);
1675 fds.res_ex = (unsigned long *) (bits + 5*size);
1676
1677 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1678 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1679 (ret = compat_get_fd_set(n, exp, fds.ex)))
1680 goto out;
1681 zero_fd_set(n, fds.res_in);
1682 zero_fd_set(n, fds.res_out);
1683 zero_fd_set(n, fds.res_ex);
1684
1685 ret = do_select(n, &fds, end_time);
1686
1687 if (ret < 0)
1688 goto out;
1689 if (!ret) {
1690 ret = -ERESTARTNOHAND;
1691 if (signal_pending(current))
1692 goto out;
1693 ret = 0;
1694 }
1695
1696 if (compat_set_fd_set(n, inp, fds.res_in) ||
1697 compat_set_fd_set(n, outp, fds.res_out) ||
1698 compat_set_fd_set(n, exp, fds.res_ex))
1699 ret = -EFAULT;
1700 out:
1701 if (bits != stack_fds)
1702 kfree(bits);
1703 out_nofds:
1704 return ret;
1705 }
1706
1707 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1708 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1709 struct compat_timeval __user *tvp)
1710 {
1711 struct timespec end_time, *to = NULL;
1712 struct compat_timeval tv;
1713 int ret;
1714
1715 if (tvp) {
1716 if (copy_from_user(&tv, tvp, sizeof(tv)))
1717 return -EFAULT;
1718
1719 to = &end_time;
1720 if (poll_select_set_timeout(to,
1721 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1722 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1723 return -EINVAL;
1724 }
1725
1726 ret = compat_core_sys_select(n, inp, outp, exp, to);
1727 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1728
1729 return ret;
1730 }
1731
1732 #ifdef HAVE_SET_RESTORE_SIGMASK
1733 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1734 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1735 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1736 compat_size_t sigsetsize)
1737 {
1738 compat_sigset_t ss32;
1739 sigset_t ksigmask, sigsaved;
1740 struct compat_timespec ts;
1741 struct timespec end_time, *to = NULL;
1742 int ret;
1743
1744 if (tsp) {
1745 if (copy_from_user(&ts, tsp, sizeof(ts)))
1746 return -EFAULT;
1747
1748 to = &end_time;
1749 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1750 return -EINVAL;
1751 }
1752
1753 if (sigmask) {
1754 if (sigsetsize != sizeof(compat_sigset_t))
1755 return -EINVAL;
1756 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1757 return -EFAULT;
1758 sigset_from_compat(&ksigmask, &ss32);
1759
1760 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1761 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1762 }
1763
1764 ret = compat_core_sys_select(n, inp, outp, exp, to);
1765 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1766
1767 if (ret == -ERESTARTNOHAND) {
1768 /*
1769 * Don't restore the signal mask yet. Let do_signal() deliver
1770 * the signal on the way back to userspace, before the signal
1771 * mask is restored.
1772 */
1773 if (sigmask) {
1774 memcpy(&current->saved_sigmask, &sigsaved,
1775 sizeof(sigsaved));
1776 set_restore_sigmask();
1777 }
1778 } else if (sigmask)
1779 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1780
1781 return ret;
1782 }
1783
1784 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1785 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1786 struct compat_timespec __user *tsp, void __user *sig)
1787 {
1788 compat_size_t sigsetsize = 0;
1789 compat_uptr_t up = 0;
1790
1791 if (sig) {
1792 if (!access_ok(VERIFY_READ, sig,
1793 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1794 __get_user(up, (compat_uptr_t __user *)sig) ||
1795 __get_user(sigsetsize,
1796 (compat_size_t __user *)(sig+sizeof(up))))
1797 return -EFAULT;
1798 }
1799 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1800 sigsetsize);
1801 }
1802
1803 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1804 unsigned int nfds, struct compat_timespec __user *tsp,
1805 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1806 {
1807 compat_sigset_t ss32;
1808 sigset_t ksigmask, sigsaved;
1809 struct compat_timespec ts;
1810 struct timespec end_time, *to = NULL;
1811 int ret;
1812
1813 if (tsp) {
1814 if (copy_from_user(&ts, tsp, sizeof(ts)))
1815 return -EFAULT;
1816
1817 to = &end_time;
1818 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1819 return -EINVAL;
1820 }
1821
1822 if (sigmask) {
1823 if (sigsetsize != sizeof(compat_sigset_t))
1824 return -EINVAL;
1825 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1826 return -EFAULT;
1827 sigset_from_compat(&ksigmask, &ss32);
1828
1829 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1830 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1831 }
1832
1833 ret = do_sys_poll(ufds, nfds, to);
1834
1835 /* We can restart this syscall, usually */
1836 if (ret == -EINTR) {
1837 /*
1838 * Don't restore the signal mask yet. Let do_signal() deliver
1839 * the signal on the way back to userspace, before the signal
1840 * mask is restored.
1841 */
1842 if (sigmask) {
1843 memcpy(&current->saved_sigmask, &sigsaved,
1844 sizeof(sigsaved));
1845 set_restore_sigmask();
1846 }
1847 ret = -ERESTARTNOHAND;
1848 } else if (sigmask)
1849 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1850
1851 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1852
1853 return ret;
1854 }
1855 #endif /* HAVE_SET_RESTORE_SIGMASK */
1856
1857 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1858 /* Stuff for NFS server syscalls... */
1859 struct compat_nfsctl_svc {
1860 u16 svc32_port;
1861 s32 svc32_nthreads;
1862 };
1863
1864 struct compat_nfsctl_client {
1865 s8 cl32_ident[NFSCLNT_IDMAX+1];
1866 s32 cl32_naddr;
1867 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1868 s32 cl32_fhkeytype;
1869 s32 cl32_fhkeylen;
1870 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1871 };
1872
1873 struct compat_nfsctl_export {
1874 char ex32_client[NFSCLNT_IDMAX+1];
1875 char ex32_path[NFS_MAXPATHLEN+1];
1876 compat_dev_t ex32_dev;
1877 compat_ino_t ex32_ino;
1878 compat_int_t ex32_flags;
1879 __compat_uid_t ex32_anon_uid;
1880 __compat_gid_t ex32_anon_gid;
1881 };
1882
1883 struct compat_nfsctl_fdparm {
1884 struct sockaddr gd32_addr;
1885 s8 gd32_path[NFS_MAXPATHLEN+1];
1886 compat_int_t gd32_version;
1887 };
1888
1889 struct compat_nfsctl_fsparm {
1890 struct sockaddr gd32_addr;
1891 s8 gd32_path[NFS_MAXPATHLEN+1];
1892 compat_int_t gd32_maxlen;
1893 };
1894
1895 struct compat_nfsctl_arg {
1896 compat_int_t ca32_version; /* safeguard */
1897 union {
1898 struct compat_nfsctl_svc u32_svc;
1899 struct compat_nfsctl_client u32_client;
1900 struct compat_nfsctl_export u32_export;
1901 struct compat_nfsctl_fdparm u32_getfd;
1902 struct compat_nfsctl_fsparm u32_getfs;
1903 } u;
1904 #define ca32_svc u.u32_svc
1905 #define ca32_client u.u32_client
1906 #define ca32_export u.u32_export
1907 #define ca32_getfd u.u32_getfd
1908 #define ca32_getfs u.u32_getfs
1909 };
1910
1911 union compat_nfsctl_res {
1912 __u8 cr32_getfh[NFS_FHSIZE];
1913 struct knfsd_fh cr32_getfs;
1914 };
1915
1916 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1917 struct compat_nfsctl_arg __user *arg)
1918 {
1919 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1920 get_user(karg->ca_version, &arg->ca32_version) ||
1921 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1922 __get_user(karg->ca_svc.svc_nthreads,
1923 &arg->ca32_svc.svc32_nthreads))
1924 return -EFAULT;
1925 return 0;
1926 }
1927
1928 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1929 struct compat_nfsctl_arg __user *arg)
1930 {
1931 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1932 sizeof(arg->ca32_client)) ||
1933 get_user(karg->ca_version, &arg->ca32_version) ||
1934 __copy_from_user(&karg->ca_client.cl_ident[0],
1935 &arg->ca32_client.cl32_ident[0],
1936 NFSCLNT_IDMAX) ||
1937 __get_user(karg->ca_client.cl_naddr,
1938 &arg->ca32_client.cl32_naddr) ||
1939 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1940 &arg->ca32_client.cl32_addrlist[0],
1941 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1942 __get_user(karg->ca_client.cl_fhkeytype,
1943 &arg->ca32_client.cl32_fhkeytype) ||
1944 __get_user(karg->ca_client.cl_fhkeylen,
1945 &arg->ca32_client.cl32_fhkeylen) ||
1946 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1947 &arg->ca32_client.cl32_fhkey[0],
1948 NFSCLNT_KEYMAX))
1949 return -EFAULT;
1950
1951 return 0;
1952 }
1953
1954 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1955 struct compat_nfsctl_arg __user *arg)
1956 {
1957 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1958 sizeof(arg->ca32_export)) ||
1959 get_user(karg->ca_version, &arg->ca32_version) ||
1960 __copy_from_user(&karg->ca_export.ex_client[0],
1961 &arg->ca32_export.ex32_client[0],
1962 NFSCLNT_IDMAX) ||
1963 __copy_from_user(&karg->ca_export.ex_path[0],
1964 &arg->ca32_export.ex32_path[0],
1965 NFS_MAXPATHLEN) ||
1966 __get_user(karg->ca_export.ex_dev,
1967 &arg->ca32_export.ex32_dev) ||
1968 __get_user(karg->ca_export.ex_ino,
1969 &arg->ca32_export.ex32_ino) ||
1970 __get_user(karg->ca_export.ex_flags,
1971 &arg->ca32_export.ex32_flags) ||
1972 __get_user(karg->ca_export.ex_anon_uid,
1973 &arg->ca32_export.ex32_anon_uid) ||
1974 __get_user(karg->ca_export.ex_anon_gid,
1975 &arg->ca32_export.ex32_anon_gid))
1976 return -EFAULT;
1977 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1978 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1979
1980 return 0;
1981 }
1982
1983 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1984 struct compat_nfsctl_arg __user *arg)
1985 {
1986 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1987 sizeof(arg->ca32_getfd)) ||
1988 get_user(karg->ca_version, &arg->ca32_version) ||
1989 __copy_from_user(&karg->ca_getfd.gd_addr,
1990 &arg->ca32_getfd.gd32_addr,
1991 (sizeof(struct sockaddr))) ||
1992 __copy_from_user(&karg->ca_getfd.gd_path,
1993 &arg->ca32_getfd.gd32_path,
1994 (NFS_MAXPATHLEN+1)) ||
1995 __get_user(karg->ca_getfd.gd_version,
1996 &arg->ca32_getfd.gd32_version))
1997 return -EFAULT;
1998
1999 return 0;
2000 }
2001
2002 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2003 struct compat_nfsctl_arg __user *arg)
2004 {
2005 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2006 get_user(karg->ca_version, &arg->ca32_version) ||
2007 __copy_from_user(&karg->ca_getfs.gd_addr,
2008 &arg->ca32_getfs.gd32_addr,
2009 (sizeof(struct sockaddr))) ||
2010 __copy_from_user(&karg->ca_getfs.gd_path,
2011 &arg->ca32_getfs.gd32_path,
2012 (NFS_MAXPATHLEN+1)) ||
2013 __get_user(karg->ca_getfs.gd_maxlen,
2014 &arg->ca32_getfs.gd32_maxlen))
2015 return -EFAULT;
2016
2017 return 0;
2018 }
2019
2020 /* This really doesn't need translations, we are only passing
2021 * back a union which contains opaque nfs file handle data.
2022 */
2023 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2024 union compat_nfsctl_res __user *res)
2025 {
2026 int err;
2027
2028 err = copy_to_user(res, kres, sizeof(*res));
2029
2030 return (err) ? -EFAULT : 0;
2031 }
2032
2033 asmlinkage long compat_sys_nfsservctl(int cmd,
2034 struct compat_nfsctl_arg __user *arg,
2035 union compat_nfsctl_res __user *res)
2036 {
2037 struct nfsctl_arg *karg;
2038 union nfsctl_res *kres;
2039 mm_segment_t oldfs;
2040 int err;
2041
2042 karg = kmalloc(sizeof(*karg), GFP_USER);
2043 kres = kmalloc(sizeof(*kres), GFP_USER);
2044 if(!karg || !kres) {
2045 err = -ENOMEM;
2046 goto done;
2047 }
2048
2049 switch(cmd) {
2050 case NFSCTL_SVC:
2051 err = compat_nfs_svc_trans(karg, arg);
2052 break;
2053
2054 case NFSCTL_ADDCLIENT:
2055 err = compat_nfs_clnt_trans(karg, arg);
2056 break;
2057
2058 case NFSCTL_DELCLIENT:
2059 err = compat_nfs_clnt_trans(karg, arg);
2060 break;
2061
2062 case NFSCTL_EXPORT:
2063 case NFSCTL_UNEXPORT:
2064 err = compat_nfs_exp_trans(karg, arg);
2065 break;
2066
2067 case NFSCTL_GETFD:
2068 err = compat_nfs_getfd_trans(karg, arg);
2069 break;
2070
2071 case NFSCTL_GETFS:
2072 err = compat_nfs_getfs_trans(karg, arg);
2073 break;
2074
2075 default:
2076 err = -EINVAL;
2077 break;
2078 }
2079
2080 if (err)
2081 goto done;
2082
2083 oldfs = get_fs();
2084 set_fs(KERNEL_DS);
2085 /* The __user pointer casts are valid because of the set_fs() */
2086 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2087 set_fs(oldfs);
2088
2089 if (err)
2090 goto done;
2091
2092 if((cmd == NFSCTL_GETFD) ||
2093 (cmd == NFSCTL_GETFS))
2094 err = compat_nfs_getfh_res_trans(kres, res);
2095
2096 done:
2097 kfree(karg);
2098 kfree(kres);
2099 return err;
2100 }
2101 #else /* !NFSD */
2102 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2103 {
2104 return sys_ni_syscall();
2105 }
2106 #endif
2107
2108 #ifdef CONFIG_EPOLL
2109
2110 #ifdef HAVE_SET_RESTORE_SIGMASK
2111 asmlinkage long compat_sys_epoll_pwait(int epfd,
2112 struct compat_epoll_event __user *events,
2113 int maxevents, int timeout,
2114 const compat_sigset_t __user *sigmask,
2115 compat_size_t sigsetsize)
2116 {
2117 long err;
2118 compat_sigset_t csigmask;
2119 sigset_t ksigmask, sigsaved;
2120
2121 /*
2122 * If the caller wants a certain signal mask to be set during the wait,
2123 * we apply it here.
2124 */
2125 if (sigmask) {
2126 if (sigsetsize != sizeof(compat_sigset_t))
2127 return -EINVAL;
2128 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2129 return -EFAULT;
2130 sigset_from_compat(&ksigmask, &csigmask);
2131 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2132 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2133 }
2134
2135 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2136
2137 /*
2138 * If we changed the signal mask, we need to restore the original one.
2139 * In case we've got a signal while waiting, we do not restore the
2140 * signal mask yet, and we allow do_signal() to deliver the signal on
2141 * the way back to userspace, before the signal mask is restored.
2142 */
2143 if (sigmask) {
2144 if (err == -EINTR) {
2145 memcpy(&current->saved_sigmask, &sigsaved,
2146 sizeof(sigsaved));
2147 set_restore_sigmask();
2148 } else
2149 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2150 }
2151
2152 return err;
2153 }
2154 #endif /* HAVE_SET_RESTORE_SIGMASK */
2155
2156 #endif /* CONFIG_EPOLL */
2157
2158 #ifdef CONFIG_SIGNALFD
2159
2160 asmlinkage long compat_sys_signalfd4(int ufd,
2161 const compat_sigset_t __user *sigmask,
2162 compat_size_t sigsetsize, int flags)
2163 {
2164 compat_sigset_t ss32;
2165 sigset_t tmp;
2166 sigset_t __user *ksigmask;
2167
2168 if (sigsetsize != sizeof(compat_sigset_t))
2169 return -EINVAL;
2170 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2171 return -EFAULT;
2172 sigset_from_compat(&tmp, &ss32);
2173 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2174 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2175 return -EFAULT;
2176
2177 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2178 }
2179
2180 asmlinkage long compat_sys_signalfd(int ufd,
2181 const compat_sigset_t __user *sigmask,
2182 compat_size_t sigsetsize)
2183 {
2184 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2185 }
2186 #endif /* CONFIG_SIGNALFD */
2187
2188 #ifdef CONFIG_TIMERFD
2189
2190 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2191 const struct compat_itimerspec __user *utmr,
2192 struct compat_itimerspec __user *otmr)
2193 {
2194 int error;
2195 struct itimerspec t;
2196 struct itimerspec __user *ut;
2197
2198 if (get_compat_itimerspec(&t, utmr))
2199 return -EFAULT;
2200 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2201 if (copy_to_user(&ut[0], &t, sizeof(t)))
2202 return -EFAULT;
2203 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2204 if (!error && otmr)
2205 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2206 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2207
2208 return error;
2209 }
2210
2211 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2212 struct compat_itimerspec __user *otmr)
2213 {
2214 int error;
2215 struct itimerspec t;
2216 struct itimerspec __user *ut;
2217
2218 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2219 error = sys_timerfd_gettime(ufd, ut);
2220 if (!error)
2221 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2222 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2223
2224 return error;
2225 }
2226
2227 #endif /* CONFIG_TIMERFD */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree