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[mirror_ubuntu-artful-kernel.git] / fs / compat.c
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/syscalls.h>
36 #include <linux/ctype.h>
37 #include <linux/module.h>
38 #include <linux/dirent.h>
39 #include <linux/fsnotify.h>
40 #include <linux/highuid.h>
41 #include <linux/nfsd/syscall.h>
42 #include <linux/personality.h>
43 #include <linux/rwsem.h>
44 #include <linux/tsacct_kern.h>
45 #include <linux/security.h>
46 #include <linux/highmem.h>
47 #include <linux/signal.h>
48 #include <linux/poll.h>
49 #include <linux/mm.h>
50 #include <linux/eventpoll.h>
51 #include <linux/fs_struct.h>
52 #include <linux/slab.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ioctls.h>
57 #include "internal.h"
58
59 int compat_log = 1;
60
61 int compat_printk(const char *fmt, ...)
62 {
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71 }
72
73 #include "read_write.h"
74
75 /*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
80 {
81 struct timespec tv[2];
82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
87 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
89 }
90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91 }
92
93 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
94 {
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
102 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103 return 0;
104 }
105 return do_utimes(dfd, filename, t ? tv : NULL, flags);
106 }
107
108 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
109 {
110 struct timespec tv[2];
111
112 if (t) {
113 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
114 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
115 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
116 get_user(tv[1].tv_nsec, &t[1].tv_usec))
117 return -EFAULT;
118 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120 return -EINVAL;
121 tv[0].tv_nsec *= 1000;
122 tv[1].tv_nsec *= 1000;
123 }
124 return do_utimes(dfd, filename, t ? tv : NULL, 0);
125 }
126
127 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
128 {
129 return compat_sys_futimesat(AT_FDCWD, filename, t);
130 }
131
132 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133 {
134 compat_ino_t ino = stat->ino;
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 int err;
138
139 SET_UID(uid, stat->uid);
140 SET_GID(gid, stat->gid);
141
142 if ((u64) stat->size > MAX_NON_LFS ||
143 !old_valid_dev(stat->dev) ||
144 !old_valid_dev(stat->rdev))
145 return -EOVERFLOW;
146 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147 return -EOVERFLOW;
148
149 if (clear_user(ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153 err |= __put_user(ino, &ubuf->st_ino);
154 err |= __put_user(stat->mode, &ubuf->st_mode);
155 err |= __put_user(stat->nlink, &ubuf->st_nlink);
156 err |= __put_user(uid, &ubuf->st_uid);
157 err |= __put_user(gid, &ubuf->st_gid);
158 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159 err |= __put_user(stat->size, &ubuf->st_size);
160 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166 err |= __put_user(stat->blksize, &ubuf->st_blksize);
167 err |= __put_user(stat->blocks, &ubuf->st_blocks);
168 return err;
169 }
170
171 asmlinkage long compat_sys_newstat(char __user * filename,
172 struct compat_stat __user *statbuf)
173 {
174 struct kstat stat;
175 int error;
176
177 error = vfs_stat(filename, &stat);
178 if (error)
179 return error;
180 return cp_compat_stat(&stat, statbuf);
181 }
182
183 asmlinkage long compat_sys_newlstat(char __user * filename,
184 struct compat_stat __user *statbuf)
185 {
186 struct kstat stat;
187 int error;
188
189 error = vfs_lstat(filename, &stat);
190 if (error)
191 return error;
192 return cp_compat_stat(&stat, statbuf);
193 }
194
195 #ifndef __ARCH_WANT_STAT64
196 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
197 struct compat_stat __user *statbuf, int flag)
198 {
199 struct kstat stat;
200 int error;
201
202 error = vfs_fstatat(dfd, filename, &stat, flag);
203 if (error)
204 return error;
205 return cp_compat_stat(&stat, statbuf);
206 }
207 #endif
208
209 asmlinkage long compat_sys_newfstat(unsigned int fd,
210 struct compat_stat __user * statbuf)
211 {
212 struct kstat stat;
213 int error = vfs_fstat(fd, &stat);
214
215 if (!error)
216 error = cp_compat_stat(&stat, statbuf);
217 return error;
218 }
219
220 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
221 {
222
223 if (sizeof ubuf->f_blocks == 4) {
224 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
225 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
226 return -EOVERFLOW;
227 /* f_files and f_ffree may be -1; it's okay
228 * to stuff that into 32 bits */
229 if (kbuf->f_files != 0xffffffffffffffffULL
230 && (kbuf->f_files & 0xffffffff00000000ULL))
231 return -EOVERFLOW;
232 if (kbuf->f_ffree != 0xffffffffffffffffULL
233 && (kbuf->f_ffree & 0xffffffff00000000ULL))
234 return -EOVERFLOW;
235 }
236 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
237 __put_user(kbuf->f_type, &ubuf->f_type) ||
238 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
239 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
240 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
241 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
242 __put_user(kbuf->f_files, &ubuf->f_files) ||
243 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
244 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
245 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
246 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
247 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
248 __put_user(0, &ubuf->f_spare[0]) ||
249 __put_user(0, &ubuf->f_spare[1]) ||
250 __put_user(0, &ubuf->f_spare[2]) ||
251 __put_user(0, &ubuf->f_spare[3]) ||
252 __put_user(0, &ubuf->f_spare[4]))
253 return -EFAULT;
254 return 0;
255 }
256
257 /*
258 * The following statfs calls are copies of code from fs/open.c and
259 * should be checked against those from time to time
260 */
261 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
262 {
263 struct path path;
264 int error;
265
266 error = user_path(pathname, &path);
267 if (!error) {
268 struct kstatfs tmp;
269 error = vfs_statfs(path.dentry, &tmp);
270 if (!error)
271 error = put_compat_statfs(buf, &tmp);
272 path_put(&path);
273 }
274 return error;
275 }
276
277 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
278 {
279 struct file * file;
280 struct kstatfs tmp;
281 int error;
282
283 error = -EBADF;
284 file = fget(fd);
285 if (!file)
286 goto out;
287 error = vfs_statfs(file->f_path.dentry, &tmp);
288 if (!error)
289 error = put_compat_statfs(buf, &tmp);
290 fput(file);
291 out:
292 return error;
293 }
294
295 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
296 {
297 if (sizeof ubuf->f_blocks == 4) {
298 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
299 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
300 return -EOVERFLOW;
301 /* f_files and f_ffree may be -1; it's okay
302 * to stuff that into 32 bits */
303 if (kbuf->f_files != 0xffffffffffffffffULL
304 && (kbuf->f_files & 0xffffffff00000000ULL))
305 return -EOVERFLOW;
306 if (kbuf->f_ffree != 0xffffffffffffffffULL
307 && (kbuf->f_ffree & 0xffffffff00000000ULL))
308 return -EOVERFLOW;
309 }
310 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
311 __put_user(kbuf->f_type, &ubuf->f_type) ||
312 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
313 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
314 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
315 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
316 __put_user(kbuf->f_files, &ubuf->f_files) ||
317 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
318 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
319 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
320 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
321 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
322 return -EFAULT;
323 return 0;
324 }
325
326 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
327 {
328 struct path path;
329 int error;
330
331 if (sz != sizeof(*buf))
332 return -EINVAL;
333
334 error = user_path(pathname, &path);
335 if (!error) {
336 struct kstatfs tmp;
337 error = vfs_statfs(path.dentry, &tmp);
338 if (!error)
339 error = put_compat_statfs64(buf, &tmp);
340 path_put(&path);
341 }
342 return error;
343 }
344
345 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
346 {
347 struct file * file;
348 struct kstatfs tmp;
349 int error;
350
351 if (sz != sizeof(*buf))
352 return -EINVAL;
353
354 error = -EBADF;
355 file = fget(fd);
356 if (!file)
357 goto out;
358 error = vfs_statfs(file->f_path.dentry, &tmp);
359 if (!error)
360 error = put_compat_statfs64(buf, &tmp);
361 fput(file);
362 out:
363 return error;
364 }
365
366 /*
367 * This is a copy of sys_ustat, just dealing with a structure layout.
368 * Given how simple this syscall is that apporach is more maintainable
369 * than the various conversion hacks.
370 */
371 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
372 {
373 struct super_block *sb;
374 struct compat_ustat tmp;
375 struct kstatfs sbuf;
376 int err;
377
378 sb = user_get_super(new_decode_dev(dev));
379 if (!sb)
380 return -EINVAL;
381 err = vfs_statfs(sb->s_root, &sbuf);
382 drop_super(sb);
383 if (err)
384 return err;
385
386 memset(&tmp, 0, sizeof(struct compat_ustat));
387 tmp.f_tfree = sbuf.f_bfree;
388 tmp.f_tinode = sbuf.f_ffree;
389 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
390 return -EFAULT;
391 return 0;
392 }
393
394 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
395 {
396 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
397 __get_user(kfl->l_type, &ufl->l_type) ||
398 __get_user(kfl->l_whence, &ufl->l_whence) ||
399 __get_user(kfl->l_start, &ufl->l_start) ||
400 __get_user(kfl->l_len, &ufl->l_len) ||
401 __get_user(kfl->l_pid, &ufl->l_pid))
402 return -EFAULT;
403 return 0;
404 }
405
406 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
407 {
408 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
409 __put_user(kfl->l_type, &ufl->l_type) ||
410 __put_user(kfl->l_whence, &ufl->l_whence) ||
411 __put_user(kfl->l_start, &ufl->l_start) ||
412 __put_user(kfl->l_len, &ufl->l_len) ||
413 __put_user(kfl->l_pid, &ufl->l_pid))
414 return -EFAULT;
415 return 0;
416 }
417
418 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
419 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
420 {
421 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
422 __get_user(kfl->l_type, &ufl->l_type) ||
423 __get_user(kfl->l_whence, &ufl->l_whence) ||
424 __get_user(kfl->l_start, &ufl->l_start) ||
425 __get_user(kfl->l_len, &ufl->l_len) ||
426 __get_user(kfl->l_pid, &ufl->l_pid))
427 return -EFAULT;
428 return 0;
429 }
430 #endif
431
432 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
433 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
434 {
435 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
436 __put_user(kfl->l_type, &ufl->l_type) ||
437 __put_user(kfl->l_whence, &ufl->l_whence) ||
438 __put_user(kfl->l_start, &ufl->l_start) ||
439 __put_user(kfl->l_len, &ufl->l_len) ||
440 __put_user(kfl->l_pid, &ufl->l_pid))
441 return -EFAULT;
442 return 0;
443 }
444 #endif
445
446 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
447 unsigned long arg)
448 {
449 mm_segment_t old_fs;
450 struct flock f;
451 long ret;
452
453 switch (cmd) {
454 case F_GETLK:
455 case F_SETLK:
456 case F_SETLKW:
457 ret = get_compat_flock(&f, compat_ptr(arg));
458 if (ret != 0)
459 break;
460 old_fs = get_fs();
461 set_fs(KERNEL_DS);
462 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
463 set_fs(old_fs);
464 if (cmd == F_GETLK && ret == 0) {
465 /* GETLK was successful and we need to return the data...
466 * but it needs to fit in the compat structure.
467 * l_start shouldn't be too big, unless the original
468 * start + end is greater than COMPAT_OFF_T_MAX, in which
469 * case the app was asking for trouble, so we return
470 * -EOVERFLOW in that case.
471 * l_len could be too big, in which case we just truncate it,
472 * and only allow the app to see that part of the conflicting
473 * lock that might make sense to it anyway
474 */
475
476 if (f.l_start > COMPAT_OFF_T_MAX)
477 ret = -EOVERFLOW;
478 if (f.l_len > COMPAT_OFF_T_MAX)
479 f.l_len = COMPAT_OFF_T_MAX;
480 if (ret == 0)
481 ret = put_compat_flock(&f, compat_ptr(arg));
482 }
483 break;
484
485 case F_GETLK64:
486 case F_SETLK64:
487 case F_SETLKW64:
488 ret = get_compat_flock64(&f, compat_ptr(arg));
489 if (ret != 0)
490 break;
491 old_fs = get_fs();
492 set_fs(KERNEL_DS);
493 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
494 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
495 (unsigned long)&f);
496 set_fs(old_fs);
497 if (cmd == F_GETLK64 && ret == 0) {
498 /* need to return lock information - see above for commentary */
499 if (f.l_start > COMPAT_LOFF_T_MAX)
500 ret = -EOVERFLOW;
501 if (f.l_len > COMPAT_LOFF_T_MAX)
502 f.l_len = COMPAT_LOFF_T_MAX;
503 if (ret == 0)
504 ret = put_compat_flock64(&f, compat_ptr(arg));
505 }
506 break;
507
508 default:
509 ret = sys_fcntl(fd, cmd, arg);
510 break;
511 }
512 return ret;
513 }
514
515 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
516 unsigned long arg)
517 {
518 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
519 return -EINVAL;
520 return compat_sys_fcntl64(fd, cmd, arg);
521 }
522
523 asmlinkage long
524 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
525 {
526 long ret;
527 aio_context_t ctx64;
528
529 mm_segment_t oldfs = get_fs();
530 if (unlikely(get_user(ctx64, ctx32p)))
531 return -EFAULT;
532
533 set_fs(KERNEL_DS);
534 /* The __user pointer cast is valid because of the set_fs() */
535 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
536 set_fs(oldfs);
537 /* truncating is ok because it's a user address */
538 if (!ret)
539 ret = put_user((u32) ctx64, ctx32p);
540 return ret;
541 }
542
543 asmlinkage long
544 compat_sys_io_getevents(aio_context_t ctx_id,
545 unsigned long min_nr,
546 unsigned long nr,
547 struct io_event __user *events,
548 struct compat_timespec __user *timeout)
549 {
550 long ret;
551 struct timespec t;
552 struct timespec __user *ut = NULL;
553
554 ret = -EFAULT;
555 if (unlikely(!access_ok(VERIFY_WRITE, events,
556 nr * sizeof(struct io_event))))
557 goto out;
558 if (timeout) {
559 if (get_compat_timespec(&t, timeout))
560 goto out;
561
562 ut = compat_alloc_user_space(sizeof(*ut));
563 if (copy_to_user(ut, &t, sizeof(t)) )
564 goto out;
565 }
566 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
567 out:
568 return ret;
569 }
570
571 static inline long
572 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
573 {
574 compat_uptr_t uptr;
575 int i;
576
577 for (i = 0; i < nr; ++i) {
578 if (get_user(uptr, ptr32 + i))
579 return -EFAULT;
580 if (put_user(compat_ptr(uptr), ptr64 + i))
581 return -EFAULT;
582 }
583 return 0;
584 }
585
586 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
587
588 asmlinkage long
589 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
590 {
591 struct iocb __user * __user *iocb64;
592 long ret;
593
594 if (unlikely(nr < 0))
595 return -EINVAL;
596
597 if (nr > MAX_AIO_SUBMITS)
598 nr = MAX_AIO_SUBMITS;
599
600 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
601 ret = copy_iocb(nr, iocb, iocb64);
602 if (!ret)
603 ret = sys_io_submit(ctx_id, nr, iocb64);
604 return ret;
605 }
606
607 struct compat_ncp_mount_data {
608 compat_int_t version;
609 compat_uint_t ncp_fd;
610 __compat_uid_t mounted_uid;
611 compat_pid_t wdog_pid;
612 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
613 compat_uint_t time_out;
614 compat_uint_t retry_count;
615 compat_uint_t flags;
616 __compat_uid_t uid;
617 __compat_gid_t gid;
618 compat_mode_t file_mode;
619 compat_mode_t dir_mode;
620 };
621
622 struct compat_ncp_mount_data_v4 {
623 compat_int_t version;
624 compat_ulong_t flags;
625 compat_ulong_t mounted_uid;
626 compat_long_t wdog_pid;
627 compat_uint_t ncp_fd;
628 compat_uint_t time_out;
629 compat_uint_t retry_count;
630 compat_ulong_t uid;
631 compat_ulong_t gid;
632 compat_ulong_t file_mode;
633 compat_ulong_t dir_mode;
634 };
635
636 static void *do_ncp_super_data_conv(void *raw_data)
637 {
638 int version = *(unsigned int *)raw_data;
639
640 if (version == 3) {
641 struct compat_ncp_mount_data *c_n = raw_data;
642 struct ncp_mount_data *n = raw_data;
643
644 n->dir_mode = c_n->dir_mode;
645 n->file_mode = c_n->file_mode;
646 n->gid = c_n->gid;
647 n->uid = c_n->uid;
648 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
649 n->wdog_pid = c_n->wdog_pid;
650 n->mounted_uid = c_n->mounted_uid;
651 } else if (version == 4) {
652 struct compat_ncp_mount_data_v4 *c_n = raw_data;
653 struct ncp_mount_data_v4 *n = raw_data;
654
655 n->dir_mode = c_n->dir_mode;
656 n->file_mode = c_n->file_mode;
657 n->gid = c_n->gid;
658 n->uid = c_n->uid;
659 n->retry_count = c_n->retry_count;
660 n->time_out = c_n->time_out;
661 n->ncp_fd = c_n->ncp_fd;
662 n->wdog_pid = c_n->wdog_pid;
663 n->mounted_uid = c_n->mounted_uid;
664 n->flags = c_n->flags;
665 } else if (version != 5) {
666 return NULL;
667 }
668
669 return raw_data;
670 }
671
672 struct compat_smb_mount_data {
673 compat_int_t version;
674 __compat_uid_t mounted_uid;
675 __compat_uid_t uid;
676 __compat_gid_t gid;
677 compat_mode_t file_mode;
678 compat_mode_t dir_mode;
679 };
680
681 static void *do_smb_super_data_conv(void *raw_data)
682 {
683 struct smb_mount_data *s = raw_data;
684 struct compat_smb_mount_data *c_s = raw_data;
685
686 if (c_s->version != SMB_MOUNT_OLDVERSION)
687 goto out;
688 s->dir_mode = c_s->dir_mode;
689 s->file_mode = c_s->file_mode;
690 s->gid = c_s->gid;
691 s->uid = c_s->uid;
692 s->mounted_uid = c_s->mounted_uid;
693 out:
694 return raw_data;
695 }
696
697 struct compat_nfs_string {
698 compat_uint_t len;
699 compat_uptr_t data;
700 };
701
702 static inline void compat_nfs_string(struct nfs_string *dst,
703 struct compat_nfs_string *src)
704 {
705 dst->data = compat_ptr(src->data);
706 dst->len = src->len;
707 }
708
709 struct compat_nfs4_mount_data_v1 {
710 compat_int_t version;
711 compat_int_t flags;
712 compat_int_t rsize;
713 compat_int_t wsize;
714 compat_int_t timeo;
715 compat_int_t retrans;
716 compat_int_t acregmin;
717 compat_int_t acregmax;
718 compat_int_t acdirmin;
719 compat_int_t acdirmax;
720 struct compat_nfs_string client_addr;
721 struct compat_nfs_string mnt_path;
722 struct compat_nfs_string hostname;
723 compat_uint_t host_addrlen;
724 compat_uptr_t host_addr;
725 compat_int_t proto;
726 compat_int_t auth_flavourlen;
727 compat_uptr_t auth_flavours;
728 };
729
730 static int do_nfs4_super_data_conv(void *raw_data)
731 {
732 int version = *(compat_uint_t *) raw_data;
733
734 if (version == 1) {
735 struct compat_nfs4_mount_data_v1 *raw = raw_data;
736 struct nfs4_mount_data *real = raw_data;
737
738 /* copy the fields backwards */
739 real->auth_flavours = compat_ptr(raw->auth_flavours);
740 real->auth_flavourlen = raw->auth_flavourlen;
741 real->proto = raw->proto;
742 real->host_addr = compat_ptr(raw->host_addr);
743 real->host_addrlen = raw->host_addrlen;
744 compat_nfs_string(&real->hostname, &raw->hostname);
745 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
746 compat_nfs_string(&real->client_addr, &raw->client_addr);
747 real->acdirmax = raw->acdirmax;
748 real->acdirmin = raw->acdirmin;
749 real->acregmax = raw->acregmax;
750 real->acregmin = raw->acregmin;
751 real->retrans = raw->retrans;
752 real->timeo = raw->timeo;
753 real->wsize = raw->wsize;
754 real->rsize = raw->rsize;
755 real->flags = raw->flags;
756 real->version = raw->version;
757 }
758
759 return 0;
760 }
761
762 #define SMBFS_NAME "smbfs"
763 #define NCPFS_NAME "ncpfs"
764 #define NFS4_NAME "nfs4"
765
766 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
767 char __user * type, unsigned long flags,
768 void __user * data)
769 {
770 char *kernel_type;
771 unsigned long data_page;
772 char *kernel_dev;
773 char *dir_page;
774 int retval;
775
776 retval = copy_mount_string(type, &kernel_type);
777 if (retval < 0)
778 goto out;
779
780 dir_page = getname(dir_name);
781 retval = PTR_ERR(dir_page);
782 if (IS_ERR(dir_page))
783 goto out1;
784
785 retval = copy_mount_string(dev_name, &kernel_dev);
786 if (retval < 0)
787 goto out2;
788
789 retval = copy_mount_options(data, &data_page);
790 if (retval < 0)
791 goto out3;
792
793 retval = -EINVAL;
794
795 if (kernel_type && data_page) {
796 if (!strcmp(kernel_type, SMBFS_NAME)) {
797 do_smb_super_data_conv((void *)data_page);
798 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
799 do_ncp_super_data_conv((void *)data_page);
800 } else if (!strcmp(kernel_type, NFS4_NAME)) {
801 if (do_nfs4_super_data_conv((void *) data_page))
802 goto out4;
803 }
804 }
805
806 retval = do_mount(kernel_dev, dir_page, kernel_type,
807 flags, (void*)data_page);
808
809 out4:
810 free_page(data_page);
811 out3:
812 kfree(kernel_dev);
813 out2:
814 putname(dir_page);
815 out1:
816 kfree(kernel_type);
817 out:
818 return retval;
819 }
820
821 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
822
823 struct compat_old_linux_dirent {
824 compat_ulong_t d_ino;
825 compat_ulong_t d_offset;
826 unsigned short d_namlen;
827 char d_name[1];
828 };
829
830 struct compat_readdir_callback {
831 struct compat_old_linux_dirent __user *dirent;
832 int result;
833 };
834
835 static int compat_fillonedir(void *__buf, const char *name, int namlen,
836 loff_t offset, u64 ino, unsigned int d_type)
837 {
838 struct compat_readdir_callback *buf = __buf;
839 struct compat_old_linux_dirent __user *dirent;
840 compat_ulong_t d_ino;
841
842 if (buf->result)
843 return -EINVAL;
844 d_ino = ino;
845 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
846 buf->result = -EOVERFLOW;
847 return -EOVERFLOW;
848 }
849 buf->result++;
850 dirent = buf->dirent;
851 if (!access_ok(VERIFY_WRITE, dirent,
852 (unsigned long)(dirent->d_name + namlen + 1) -
853 (unsigned long)dirent))
854 goto efault;
855 if ( __put_user(d_ino, &dirent->d_ino) ||
856 __put_user(offset, &dirent->d_offset) ||
857 __put_user(namlen, &dirent->d_namlen) ||
858 __copy_to_user(dirent->d_name, name, namlen) ||
859 __put_user(0, dirent->d_name + namlen))
860 goto efault;
861 return 0;
862 efault:
863 buf->result = -EFAULT;
864 return -EFAULT;
865 }
866
867 asmlinkage long compat_sys_old_readdir(unsigned int fd,
868 struct compat_old_linux_dirent __user *dirent, unsigned int count)
869 {
870 int error;
871 struct file *file;
872 struct compat_readdir_callback buf;
873
874 error = -EBADF;
875 file = fget(fd);
876 if (!file)
877 goto out;
878
879 buf.result = 0;
880 buf.dirent = dirent;
881
882 error = vfs_readdir(file, compat_fillonedir, &buf);
883 if (buf.result)
884 error = buf.result;
885
886 fput(file);
887 out:
888 return error;
889 }
890
891 struct compat_linux_dirent {
892 compat_ulong_t d_ino;
893 compat_ulong_t d_off;
894 unsigned short d_reclen;
895 char d_name[1];
896 };
897
898 struct compat_getdents_callback {
899 struct compat_linux_dirent __user *current_dir;
900 struct compat_linux_dirent __user *previous;
901 int count;
902 int error;
903 };
904
905 static int compat_filldir(void *__buf, const char *name, int namlen,
906 loff_t offset, u64 ino, unsigned int d_type)
907 {
908 struct compat_linux_dirent __user * dirent;
909 struct compat_getdents_callback *buf = __buf;
910 compat_ulong_t d_ino;
911 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
912
913 buf->error = -EINVAL; /* only used if we fail.. */
914 if (reclen > buf->count)
915 return -EINVAL;
916 d_ino = ino;
917 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
918 buf->error = -EOVERFLOW;
919 return -EOVERFLOW;
920 }
921 dirent = buf->previous;
922 if (dirent) {
923 if (__put_user(offset, &dirent->d_off))
924 goto efault;
925 }
926 dirent = buf->current_dir;
927 if (__put_user(d_ino, &dirent->d_ino))
928 goto efault;
929 if (__put_user(reclen, &dirent->d_reclen))
930 goto efault;
931 if (copy_to_user(dirent->d_name, name, namlen))
932 goto efault;
933 if (__put_user(0, dirent->d_name + namlen))
934 goto efault;
935 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
936 goto efault;
937 buf->previous = dirent;
938 dirent = (void __user *)dirent + reclen;
939 buf->current_dir = dirent;
940 buf->count -= reclen;
941 return 0;
942 efault:
943 buf->error = -EFAULT;
944 return -EFAULT;
945 }
946
947 asmlinkage long compat_sys_getdents(unsigned int fd,
948 struct compat_linux_dirent __user *dirent, unsigned int count)
949 {
950 struct file * file;
951 struct compat_linux_dirent __user * lastdirent;
952 struct compat_getdents_callback buf;
953 int error;
954
955 error = -EFAULT;
956 if (!access_ok(VERIFY_WRITE, dirent, count))
957 goto out;
958
959 error = -EBADF;
960 file = fget(fd);
961 if (!file)
962 goto out;
963
964 buf.current_dir = dirent;
965 buf.previous = NULL;
966 buf.count = count;
967 buf.error = 0;
968
969 error = vfs_readdir(file, compat_filldir, &buf);
970 if (error >= 0)
971 error = buf.error;
972 lastdirent = buf.previous;
973 if (lastdirent) {
974 if (put_user(file->f_pos, &lastdirent->d_off))
975 error = -EFAULT;
976 else
977 error = count - buf.count;
978 }
979 fput(file);
980 out:
981 return error;
982 }
983
984 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
985
986 struct compat_getdents_callback64 {
987 struct linux_dirent64 __user *current_dir;
988 struct linux_dirent64 __user *previous;
989 int count;
990 int error;
991 };
992
993 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
994 u64 ino, unsigned int d_type)
995 {
996 struct linux_dirent64 __user *dirent;
997 struct compat_getdents_callback64 *buf = __buf;
998 int jj = NAME_OFFSET(dirent);
999 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1000 u64 off;
1001
1002 buf->error = -EINVAL; /* only used if we fail.. */
1003 if (reclen > buf->count)
1004 return -EINVAL;
1005 dirent = buf->previous;
1006
1007 if (dirent) {
1008 if (__put_user_unaligned(offset, &dirent->d_off))
1009 goto efault;
1010 }
1011 dirent = buf->current_dir;
1012 if (__put_user_unaligned(ino, &dirent->d_ino))
1013 goto efault;
1014 off = 0;
1015 if (__put_user_unaligned(off, &dirent->d_off))
1016 goto efault;
1017 if (__put_user(reclen, &dirent->d_reclen))
1018 goto efault;
1019 if (__put_user(d_type, &dirent->d_type))
1020 goto efault;
1021 if (copy_to_user(dirent->d_name, name, namlen))
1022 goto efault;
1023 if (__put_user(0, dirent->d_name + namlen))
1024 goto efault;
1025 buf->previous = dirent;
1026 dirent = (void __user *)dirent + reclen;
1027 buf->current_dir = dirent;
1028 buf->count -= reclen;
1029 return 0;
1030 efault:
1031 buf->error = -EFAULT;
1032 return -EFAULT;
1033 }
1034
1035 asmlinkage long compat_sys_getdents64(unsigned int fd,
1036 struct linux_dirent64 __user * dirent, unsigned int count)
1037 {
1038 struct file * file;
1039 struct linux_dirent64 __user * lastdirent;
1040 struct compat_getdents_callback64 buf;
1041 int error;
1042
1043 error = -EFAULT;
1044 if (!access_ok(VERIFY_WRITE, dirent, count))
1045 goto out;
1046
1047 error = -EBADF;
1048 file = fget(fd);
1049 if (!file)
1050 goto out;
1051
1052 buf.current_dir = dirent;
1053 buf.previous = NULL;
1054 buf.count = count;
1055 buf.error = 0;
1056
1057 error = vfs_readdir(file, compat_filldir64, &buf);
1058 if (error >= 0)
1059 error = buf.error;
1060 lastdirent = buf.previous;
1061 if (lastdirent) {
1062 typeof(lastdirent->d_off) d_off = file->f_pos;
1063 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1064 error = -EFAULT;
1065 else
1066 error = count - buf.count;
1067 }
1068 fput(file);
1069 out:
1070 return error;
1071 }
1072 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1073
1074 static ssize_t compat_do_readv_writev(int type, struct file *file,
1075 const struct compat_iovec __user *uvector,
1076 unsigned long nr_segs, loff_t *pos)
1077 {
1078 compat_ssize_t tot_len;
1079 struct iovec iovstack[UIO_FASTIOV];
1080 struct iovec *iov=iovstack, *vector;
1081 ssize_t ret;
1082 int seg;
1083 io_fn_t fn;
1084 iov_fn_t fnv;
1085
1086 /*
1087 * SuS says "The readv() function *may* fail if the iovcnt argument
1088 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1089 * traditionally returned zero for zero segments, so...
1090 */
1091 ret = 0;
1092 if (nr_segs == 0)
1093 goto out;
1094
1095 /*
1096 * First get the "struct iovec" from user memory and
1097 * verify all the pointers
1098 */
1099 ret = -EINVAL;
1100 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1101 goto out;
1102 if (!file->f_op)
1103 goto out;
1104 if (nr_segs > UIO_FASTIOV) {
1105 ret = -ENOMEM;
1106 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1107 if (!iov)
1108 goto out;
1109 }
1110 ret = -EFAULT;
1111 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1112 goto out;
1113
1114 /*
1115 * Single unix specification:
1116 * We should -EINVAL if an element length is not >= 0 and fitting an
1117 * ssize_t. The total length is fitting an ssize_t
1118 *
1119 * Be careful here because iov_len is a size_t not an ssize_t
1120 */
1121 tot_len = 0;
1122 vector = iov;
1123 ret = -EINVAL;
1124 for (seg = 0 ; seg < nr_segs; seg++) {
1125 compat_ssize_t tmp = tot_len;
1126 compat_ssize_t len;
1127 compat_uptr_t buf;
1128
1129 if (__get_user(len, &uvector->iov_len) ||
1130 __get_user(buf, &uvector->iov_base)) {
1131 ret = -EFAULT;
1132 goto out;
1133 }
1134 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1135 goto out;
1136 tot_len += len;
1137 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1138 goto out;
1139 vector->iov_base = compat_ptr(buf);
1140 vector->iov_len = (compat_size_t) len;
1141 uvector++;
1142 vector++;
1143 }
1144 if (tot_len == 0) {
1145 ret = 0;
1146 goto out;
1147 }
1148
1149 ret = rw_verify_area(type, file, pos, tot_len);
1150 if (ret < 0)
1151 goto out;
1152
1153 fnv = NULL;
1154 if (type == READ) {
1155 fn = file->f_op->read;
1156 fnv = file->f_op->aio_read;
1157 } else {
1158 fn = (io_fn_t)file->f_op->write;
1159 fnv = file->f_op->aio_write;
1160 }
1161
1162 if (fnv)
1163 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1164 pos, fnv);
1165 else
1166 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1167
1168 out:
1169 if (iov != iovstack)
1170 kfree(iov);
1171 if ((ret + (type == READ)) > 0) {
1172 struct dentry *dentry = file->f_path.dentry;
1173 if (type == READ)
1174 fsnotify_access(dentry);
1175 else
1176 fsnotify_modify(dentry);
1177 }
1178 return ret;
1179 }
1180
1181 static size_t compat_readv(struct file *file,
1182 const struct compat_iovec __user *vec,
1183 unsigned long vlen, loff_t *pos)
1184 {
1185 ssize_t ret = -EBADF;
1186
1187 if (!(file->f_mode & FMODE_READ))
1188 goto out;
1189
1190 ret = -EINVAL;
1191 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1192 goto out;
1193
1194 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1195
1196 out:
1197 if (ret > 0)
1198 add_rchar(current, ret);
1199 inc_syscr(current);
1200 return ret;
1201 }
1202
1203 asmlinkage ssize_t
1204 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1205 unsigned long vlen)
1206 {
1207 struct file *file;
1208 int fput_needed;
1209 ssize_t ret;
1210
1211 file = fget_light(fd, &fput_needed);
1212 if (!file)
1213 return -EBADF;
1214 ret = compat_readv(file, vec, vlen, &file->f_pos);
1215 fput_light(file, fput_needed);
1216 return ret;
1217 }
1218
1219 asmlinkage ssize_t
1220 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1221 unsigned long vlen, u32 pos_low, u32 pos_high)
1222 {
1223 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1224 struct file *file;
1225 int fput_needed;
1226 ssize_t ret;
1227
1228 if (pos < 0)
1229 return -EINVAL;
1230 file = fget_light(fd, &fput_needed);
1231 if (!file)
1232 return -EBADF;
1233 ret = compat_readv(file, vec, vlen, &pos);
1234 fput_light(file, fput_needed);
1235 return ret;
1236 }
1237
1238 static size_t compat_writev(struct file *file,
1239 const struct compat_iovec __user *vec,
1240 unsigned long vlen, loff_t *pos)
1241 {
1242 ssize_t ret = -EBADF;
1243
1244 if (!(file->f_mode & FMODE_WRITE))
1245 goto out;
1246
1247 ret = -EINVAL;
1248 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1249 goto out;
1250
1251 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1252
1253 out:
1254 if (ret > 0)
1255 add_wchar(current, ret);
1256 inc_syscw(current);
1257 return ret;
1258 }
1259
1260 asmlinkage ssize_t
1261 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1262 unsigned long vlen)
1263 {
1264 struct file *file;
1265 int fput_needed;
1266 ssize_t ret;
1267
1268 file = fget_light(fd, &fput_needed);
1269 if (!file)
1270 return -EBADF;
1271 ret = compat_writev(file, vec, vlen, &file->f_pos);
1272 fput_light(file, fput_needed);
1273 return ret;
1274 }
1275
1276 asmlinkage ssize_t
1277 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1278 unsigned long vlen, u32 pos_low, u32 pos_high)
1279 {
1280 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1281 struct file *file;
1282 int fput_needed;
1283 ssize_t ret;
1284
1285 if (pos < 0)
1286 return -EINVAL;
1287 file = fget_light(fd, &fput_needed);
1288 if (!file)
1289 return -EBADF;
1290 ret = compat_writev(file, vec, vlen, &pos);
1291 fput_light(file, fput_needed);
1292 return ret;
1293 }
1294
1295 asmlinkage long
1296 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1297 unsigned int nr_segs, unsigned int flags)
1298 {
1299 unsigned i;
1300 struct iovec __user *iov;
1301 if (nr_segs > UIO_MAXIOV)
1302 return -EINVAL;
1303 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1304 for (i = 0; i < nr_segs; i++) {
1305 struct compat_iovec v;
1306 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1307 get_user(v.iov_len, &iov32[i].iov_len) ||
1308 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1309 put_user(v.iov_len, &iov[i].iov_len))
1310 return -EFAULT;
1311 }
1312 return sys_vmsplice(fd, iov, nr_segs, flags);
1313 }
1314
1315 /*
1316 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1317 * O_LARGEFILE flag.
1318 */
1319 asmlinkage long
1320 compat_sys_open(const char __user *filename, int flags, int mode)
1321 {
1322 return do_sys_open(AT_FDCWD, filename, flags, mode);
1323 }
1324
1325 /*
1326 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1327 * O_LARGEFILE flag.
1328 */
1329 asmlinkage long
1330 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1331 {
1332 return do_sys_open(dfd, filename, flags, mode);
1333 }
1334
1335 /*
1336 * compat_count() counts the number of arguments/envelopes. It is basically
1337 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1338 * and envp pointers.
1339 */
1340 static int compat_count(compat_uptr_t __user *argv, int max)
1341 {
1342 int i = 0;
1343
1344 if (argv != NULL) {
1345 for (;;) {
1346 compat_uptr_t p;
1347
1348 if (get_user(p, argv))
1349 return -EFAULT;
1350 if (!p)
1351 break;
1352 argv++;
1353 if (i++ >= max)
1354 return -E2BIG;
1355 }
1356 }
1357 return i;
1358 }
1359
1360 /*
1361 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1362 * except that it works with 32 bit argv and envp pointers.
1363 */
1364 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1365 struct linux_binprm *bprm)
1366 {
1367 struct page *kmapped_page = NULL;
1368 char *kaddr = NULL;
1369 unsigned long kpos = 0;
1370 int ret;
1371
1372 while (argc-- > 0) {
1373 compat_uptr_t str;
1374 int len;
1375 unsigned long pos;
1376
1377 if (get_user(str, argv+argc) ||
1378 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1379 ret = -EFAULT;
1380 goto out;
1381 }
1382
1383 if (len > MAX_ARG_STRLEN) {
1384 ret = -E2BIG;
1385 goto out;
1386 }
1387
1388 /* We're going to work our way backwords. */
1389 pos = bprm->p;
1390 str += len;
1391 bprm->p -= len;
1392
1393 while (len > 0) {
1394 int offset, bytes_to_copy;
1395
1396 offset = pos % PAGE_SIZE;
1397 if (offset == 0)
1398 offset = PAGE_SIZE;
1399
1400 bytes_to_copy = offset;
1401 if (bytes_to_copy > len)
1402 bytes_to_copy = len;
1403
1404 offset -= bytes_to_copy;
1405 pos -= bytes_to_copy;
1406 str -= bytes_to_copy;
1407 len -= bytes_to_copy;
1408
1409 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1410 struct page *page;
1411
1412 #ifdef CONFIG_STACK_GROWSUP
1413 ret = expand_stack_downwards(bprm->vma, pos);
1414 if (ret < 0) {
1415 /* We've exceed the stack rlimit. */
1416 ret = -E2BIG;
1417 goto out;
1418 }
1419 #endif
1420 ret = get_user_pages(current, bprm->mm, pos,
1421 1, 1, 1, &page, NULL);
1422 if (ret <= 0) {
1423 /* We've exceed the stack rlimit. */
1424 ret = -E2BIG;
1425 goto out;
1426 }
1427
1428 if (kmapped_page) {
1429 flush_kernel_dcache_page(kmapped_page);
1430 kunmap(kmapped_page);
1431 put_page(kmapped_page);
1432 }
1433 kmapped_page = page;
1434 kaddr = kmap(kmapped_page);
1435 kpos = pos & PAGE_MASK;
1436 flush_cache_page(bprm->vma, kpos,
1437 page_to_pfn(kmapped_page));
1438 }
1439 if (copy_from_user(kaddr+offset, compat_ptr(str),
1440 bytes_to_copy)) {
1441 ret = -EFAULT;
1442 goto out;
1443 }
1444 }
1445 }
1446 ret = 0;
1447 out:
1448 if (kmapped_page) {
1449 flush_kernel_dcache_page(kmapped_page);
1450 kunmap(kmapped_page);
1451 put_page(kmapped_page);
1452 }
1453 return ret;
1454 }
1455
1456 /*
1457 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1458 * that it processes 32 bit argv and envp pointers.
1459 */
1460 int compat_do_execve(char * filename,
1461 compat_uptr_t __user *argv,
1462 compat_uptr_t __user *envp,
1463 struct pt_regs * regs)
1464 {
1465 struct linux_binprm *bprm;
1466 struct file *file;
1467 struct files_struct *displaced;
1468 bool clear_in_exec;
1469 int retval;
1470
1471 retval = unshare_files(&displaced);
1472 if (retval)
1473 goto out_ret;
1474
1475 retval = -ENOMEM;
1476 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1477 if (!bprm)
1478 goto out_files;
1479
1480 retval = prepare_bprm_creds(bprm);
1481 if (retval)
1482 goto out_free;
1483
1484 retval = check_unsafe_exec(bprm);
1485 if (retval < 0)
1486 goto out_free;
1487 clear_in_exec = retval;
1488 current->in_execve = 1;
1489
1490 file = open_exec(filename);
1491 retval = PTR_ERR(file);
1492 if (IS_ERR(file))
1493 goto out_unmark;
1494
1495 sched_exec();
1496
1497 bprm->file = file;
1498 bprm->filename = filename;
1499 bprm->interp = filename;
1500
1501 retval = bprm_mm_init(bprm);
1502 if (retval)
1503 goto out_file;
1504
1505 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1506 if ((retval = bprm->argc) < 0)
1507 goto out;
1508
1509 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1510 if ((retval = bprm->envc) < 0)
1511 goto out;
1512
1513 retval = prepare_binprm(bprm);
1514 if (retval < 0)
1515 goto out;
1516
1517 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1518 if (retval < 0)
1519 goto out;
1520
1521 bprm->exec = bprm->p;
1522 retval = compat_copy_strings(bprm->envc, envp, bprm);
1523 if (retval < 0)
1524 goto out;
1525
1526 retval = compat_copy_strings(bprm->argc, argv, bprm);
1527 if (retval < 0)
1528 goto out;
1529
1530 retval = search_binary_handler(bprm, regs);
1531 if (retval < 0)
1532 goto out;
1533
1534 current->stack_start = current->mm->start_stack;
1535
1536 /* execve succeeded */
1537 current->fs->in_exec = 0;
1538 current->in_execve = 0;
1539 acct_update_integrals(current);
1540 free_bprm(bprm);
1541 if (displaced)
1542 put_files_struct(displaced);
1543 return retval;
1544
1545 out:
1546 if (bprm->mm)
1547 mmput(bprm->mm);
1548
1549 out_file:
1550 if (bprm->file) {
1551 allow_write_access(bprm->file);
1552 fput(bprm->file);
1553 }
1554
1555 out_unmark:
1556 if (clear_in_exec)
1557 current->fs->in_exec = 0;
1558 current->in_execve = 0;
1559
1560 out_free:
1561 free_bprm(bprm);
1562
1563 out_files:
1564 if (displaced)
1565 reset_files_struct(displaced);
1566 out_ret:
1567 return retval;
1568 }
1569
1570 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1571
1572 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1573 int timeval, int ret)
1574 {
1575 struct timespec ts;
1576
1577 if (!p)
1578 return ret;
1579
1580 if (current->personality & STICKY_TIMEOUTS)
1581 goto sticky;
1582
1583 /* No update for zero timeout */
1584 if (!end_time->tv_sec && !end_time->tv_nsec)
1585 return ret;
1586
1587 ktime_get_ts(&ts);
1588 ts = timespec_sub(*end_time, ts);
1589 if (ts.tv_sec < 0)
1590 ts.tv_sec = ts.tv_nsec = 0;
1591
1592 if (timeval) {
1593 struct compat_timeval rtv;
1594
1595 rtv.tv_sec = ts.tv_sec;
1596 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1597
1598 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1599 return ret;
1600 } else {
1601 struct compat_timespec rts;
1602
1603 rts.tv_sec = ts.tv_sec;
1604 rts.tv_nsec = ts.tv_nsec;
1605
1606 if (!copy_to_user(p, &rts, sizeof(rts)))
1607 return ret;
1608 }
1609 /*
1610 * If an application puts its timeval in read-only memory, we
1611 * don't want the Linux-specific update to the timeval to
1612 * cause a fault after the select has completed
1613 * successfully. However, because we're not updating the
1614 * timeval, we can't restart the system call.
1615 */
1616
1617 sticky:
1618 if (ret == -ERESTARTNOHAND)
1619 ret = -EINTR;
1620 return ret;
1621 }
1622
1623 /*
1624 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1625 * 64-bit unsigned longs.
1626 */
1627 static
1628 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1629 unsigned long *fdset)
1630 {
1631 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1632 if (ufdset) {
1633 unsigned long odd;
1634
1635 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1636 return -EFAULT;
1637
1638 odd = nr & 1UL;
1639 nr &= ~1UL;
1640 while (nr) {
1641 unsigned long h, l;
1642 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1643 return -EFAULT;
1644 ufdset += 2;
1645 *fdset++ = h << 32 | l;
1646 nr -= 2;
1647 }
1648 if (odd && __get_user(*fdset, ufdset))
1649 return -EFAULT;
1650 } else {
1651 /* Tricky, must clear full unsigned long in the
1652 * kernel fdset at the end, this makes sure that
1653 * actually happens.
1654 */
1655 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1656 }
1657 return 0;
1658 }
1659
1660 static
1661 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1662 unsigned long *fdset)
1663 {
1664 unsigned long odd;
1665 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1666
1667 if (!ufdset)
1668 return 0;
1669
1670 odd = nr & 1UL;
1671 nr &= ~1UL;
1672 while (nr) {
1673 unsigned long h, l;
1674 l = *fdset++;
1675 h = l >> 32;
1676 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1677 return -EFAULT;
1678 ufdset += 2;
1679 nr -= 2;
1680 }
1681 if (odd && __put_user(*fdset, ufdset))
1682 return -EFAULT;
1683 return 0;
1684 }
1685
1686
1687 /*
1688 * This is a virtual copy of sys_select from fs/select.c and probably
1689 * should be compared to it from time to time
1690 */
1691
1692 /*
1693 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1694 * like to be certain this leads to no problems. So I return
1695 * EINTR just for safety.
1696 *
1697 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1698 * I'm trying ERESTARTNOHAND which restart only when you want to.
1699 */
1700 #define MAX_SELECT_SECONDS \
1701 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1702
1703 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1704 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1705 struct timespec *end_time)
1706 {
1707 fd_set_bits fds;
1708 void *bits;
1709 int size, max_fds, ret = -EINVAL;
1710 struct fdtable *fdt;
1711 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1712
1713 if (n < 0)
1714 goto out_nofds;
1715
1716 /* max_fds can increase, so grab it once to avoid race */
1717 rcu_read_lock();
1718 fdt = files_fdtable(current->files);
1719 max_fds = fdt->max_fds;
1720 rcu_read_unlock();
1721 if (n > max_fds)
1722 n = max_fds;
1723
1724 /*
1725 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1726 * since we used fdset we need to allocate memory in units of
1727 * long-words.
1728 */
1729 size = FDS_BYTES(n);
1730 bits = stack_fds;
1731 if (size > sizeof(stack_fds) / 6) {
1732 bits = kmalloc(6 * size, GFP_KERNEL);
1733 ret = -ENOMEM;
1734 if (!bits)
1735 goto out_nofds;
1736 }
1737 fds.in = (unsigned long *) bits;
1738 fds.out = (unsigned long *) (bits + size);
1739 fds.ex = (unsigned long *) (bits + 2*size);
1740 fds.res_in = (unsigned long *) (bits + 3*size);
1741 fds.res_out = (unsigned long *) (bits + 4*size);
1742 fds.res_ex = (unsigned long *) (bits + 5*size);
1743
1744 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1745 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1746 (ret = compat_get_fd_set(n, exp, fds.ex)))
1747 goto out;
1748 zero_fd_set(n, fds.res_in);
1749 zero_fd_set(n, fds.res_out);
1750 zero_fd_set(n, fds.res_ex);
1751
1752 ret = do_select(n, &fds, end_time);
1753
1754 if (ret < 0)
1755 goto out;
1756 if (!ret) {
1757 ret = -ERESTARTNOHAND;
1758 if (signal_pending(current))
1759 goto out;
1760 ret = 0;
1761 }
1762
1763 if (compat_set_fd_set(n, inp, fds.res_in) ||
1764 compat_set_fd_set(n, outp, fds.res_out) ||
1765 compat_set_fd_set(n, exp, fds.res_ex))
1766 ret = -EFAULT;
1767 out:
1768 if (bits != stack_fds)
1769 kfree(bits);
1770 out_nofds:
1771 return ret;
1772 }
1773
1774 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1775 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1776 struct compat_timeval __user *tvp)
1777 {
1778 struct timespec end_time, *to = NULL;
1779 struct compat_timeval tv;
1780 int ret;
1781
1782 if (tvp) {
1783 if (copy_from_user(&tv, tvp, sizeof(tv)))
1784 return -EFAULT;
1785
1786 to = &end_time;
1787 if (poll_select_set_timeout(to,
1788 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1789 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1790 return -EINVAL;
1791 }
1792
1793 ret = compat_core_sys_select(n, inp, outp, exp, to);
1794 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1795
1796 return ret;
1797 }
1798
1799 struct compat_sel_arg_struct {
1800 compat_ulong_t n;
1801 compat_uptr_t inp;
1802 compat_uptr_t outp;
1803 compat_uptr_t exp;
1804 compat_uptr_t tvp;
1805 };
1806
1807 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1808 {
1809 struct compat_sel_arg_struct a;
1810
1811 if (copy_from_user(&a, arg, sizeof(a)))
1812 return -EFAULT;
1813 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1814 compat_ptr(a.exp), compat_ptr(a.tvp));
1815 }
1816
1817 #ifdef HAVE_SET_RESTORE_SIGMASK
1818 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1819 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1820 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1821 compat_size_t sigsetsize)
1822 {
1823 compat_sigset_t ss32;
1824 sigset_t ksigmask, sigsaved;
1825 struct compat_timespec ts;
1826 struct timespec end_time, *to = NULL;
1827 int ret;
1828
1829 if (tsp) {
1830 if (copy_from_user(&ts, tsp, sizeof(ts)))
1831 return -EFAULT;
1832
1833 to = &end_time;
1834 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1835 return -EINVAL;
1836 }
1837
1838 if (sigmask) {
1839 if (sigsetsize != sizeof(compat_sigset_t))
1840 return -EINVAL;
1841 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1842 return -EFAULT;
1843 sigset_from_compat(&ksigmask, &ss32);
1844
1845 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1846 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1847 }
1848
1849 ret = compat_core_sys_select(n, inp, outp, exp, to);
1850 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1851
1852 if (ret == -ERESTARTNOHAND) {
1853 /*
1854 * Don't restore the signal mask yet. Let do_signal() deliver
1855 * the signal on the way back to userspace, before the signal
1856 * mask is restored.
1857 */
1858 if (sigmask) {
1859 memcpy(&current->saved_sigmask, &sigsaved,
1860 sizeof(sigsaved));
1861 set_restore_sigmask();
1862 }
1863 } else if (sigmask)
1864 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1865
1866 return ret;
1867 }
1868
1869 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1870 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1871 struct compat_timespec __user *tsp, void __user *sig)
1872 {
1873 compat_size_t sigsetsize = 0;
1874 compat_uptr_t up = 0;
1875
1876 if (sig) {
1877 if (!access_ok(VERIFY_READ, sig,
1878 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1879 __get_user(up, (compat_uptr_t __user *)sig) ||
1880 __get_user(sigsetsize,
1881 (compat_size_t __user *)(sig+sizeof(up))))
1882 return -EFAULT;
1883 }
1884 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1885 sigsetsize);
1886 }
1887
1888 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1889 unsigned int nfds, struct compat_timespec __user *tsp,
1890 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1891 {
1892 compat_sigset_t ss32;
1893 sigset_t ksigmask, sigsaved;
1894 struct compat_timespec ts;
1895 struct timespec end_time, *to = NULL;
1896 int ret;
1897
1898 if (tsp) {
1899 if (copy_from_user(&ts, tsp, sizeof(ts)))
1900 return -EFAULT;
1901
1902 to = &end_time;
1903 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1904 return -EINVAL;
1905 }
1906
1907 if (sigmask) {
1908 if (sigsetsize != sizeof(compat_sigset_t))
1909 return -EINVAL;
1910 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1911 return -EFAULT;
1912 sigset_from_compat(&ksigmask, &ss32);
1913
1914 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1915 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1916 }
1917
1918 ret = do_sys_poll(ufds, nfds, to);
1919
1920 /* We can restart this syscall, usually */
1921 if (ret == -EINTR) {
1922 /*
1923 * Don't restore the signal mask yet. Let do_signal() deliver
1924 * the signal on the way back to userspace, before the signal
1925 * mask is restored.
1926 */
1927 if (sigmask) {
1928 memcpy(&current->saved_sigmask, &sigsaved,
1929 sizeof(sigsaved));
1930 set_restore_sigmask();
1931 }
1932 ret = -ERESTARTNOHAND;
1933 } else if (sigmask)
1934 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1935
1936 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1937
1938 return ret;
1939 }
1940 #endif /* HAVE_SET_RESTORE_SIGMASK */
1941
1942 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1943 /* Stuff for NFS server syscalls... */
1944 struct compat_nfsctl_svc {
1945 u16 svc32_port;
1946 s32 svc32_nthreads;
1947 };
1948
1949 struct compat_nfsctl_client {
1950 s8 cl32_ident[NFSCLNT_IDMAX+1];
1951 s32 cl32_naddr;
1952 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1953 s32 cl32_fhkeytype;
1954 s32 cl32_fhkeylen;
1955 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1956 };
1957
1958 struct compat_nfsctl_export {
1959 char ex32_client[NFSCLNT_IDMAX+1];
1960 char ex32_path[NFS_MAXPATHLEN+1];
1961 compat_dev_t ex32_dev;
1962 compat_ino_t ex32_ino;
1963 compat_int_t ex32_flags;
1964 __compat_uid_t ex32_anon_uid;
1965 __compat_gid_t ex32_anon_gid;
1966 };
1967
1968 struct compat_nfsctl_fdparm {
1969 struct sockaddr gd32_addr;
1970 s8 gd32_path[NFS_MAXPATHLEN+1];
1971 compat_int_t gd32_version;
1972 };
1973
1974 struct compat_nfsctl_fsparm {
1975 struct sockaddr gd32_addr;
1976 s8 gd32_path[NFS_MAXPATHLEN+1];
1977 compat_int_t gd32_maxlen;
1978 };
1979
1980 struct compat_nfsctl_arg {
1981 compat_int_t ca32_version; /* safeguard */
1982 union {
1983 struct compat_nfsctl_svc u32_svc;
1984 struct compat_nfsctl_client u32_client;
1985 struct compat_nfsctl_export u32_export;
1986 struct compat_nfsctl_fdparm u32_getfd;
1987 struct compat_nfsctl_fsparm u32_getfs;
1988 } u;
1989 #define ca32_svc u.u32_svc
1990 #define ca32_client u.u32_client
1991 #define ca32_export u.u32_export
1992 #define ca32_getfd u.u32_getfd
1993 #define ca32_getfs u.u32_getfs
1994 };
1995
1996 union compat_nfsctl_res {
1997 __u8 cr32_getfh[NFS_FHSIZE];
1998 struct knfsd_fh cr32_getfs;
1999 };
2000
2001 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2002 struct compat_nfsctl_arg __user *arg)
2003 {
2004 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2005 get_user(karg->ca_version, &arg->ca32_version) ||
2006 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2007 __get_user(karg->ca_svc.svc_nthreads,
2008 &arg->ca32_svc.svc32_nthreads))
2009 return -EFAULT;
2010 return 0;
2011 }
2012
2013 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2014 struct compat_nfsctl_arg __user *arg)
2015 {
2016 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2017 sizeof(arg->ca32_client)) ||
2018 get_user(karg->ca_version, &arg->ca32_version) ||
2019 __copy_from_user(&karg->ca_client.cl_ident[0],
2020 &arg->ca32_client.cl32_ident[0],
2021 NFSCLNT_IDMAX) ||
2022 __get_user(karg->ca_client.cl_naddr,
2023 &arg->ca32_client.cl32_naddr) ||
2024 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2025 &arg->ca32_client.cl32_addrlist[0],
2026 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2027 __get_user(karg->ca_client.cl_fhkeytype,
2028 &arg->ca32_client.cl32_fhkeytype) ||
2029 __get_user(karg->ca_client.cl_fhkeylen,
2030 &arg->ca32_client.cl32_fhkeylen) ||
2031 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2032 &arg->ca32_client.cl32_fhkey[0],
2033 NFSCLNT_KEYMAX))
2034 return -EFAULT;
2035
2036 return 0;
2037 }
2038
2039 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2040 struct compat_nfsctl_arg __user *arg)
2041 {
2042 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2043 sizeof(arg->ca32_export)) ||
2044 get_user(karg->ca_version, &arg->ca32_version) ||
2045 __copy_from_user(&karg->ca_export.ex_client[0],
2046 &arg->ca32_export.ex32_client[0],
2047 NFSCLNT_IDMAX) ||
2048 __copy_from_user(&karg->ca_export.ex_path[0],
2049 &arg->ca32_export.ex32_path[0],
2050 NFS_MAXPATHLEN) ||
2051 __get_user(karg->ca_export.ex_dev,
2052 &arg->ca32_export.ex32_dev) ||
2053 __get_user(karg->ca_export.ex_ino,
2054 &arg->ca32_export.ex32_ino) ||
2055 __get_user(karg->ca_export.ex_flags,
2056 &arg->ca32_export.ex32_flags) ||
2057 __get_user(karg->ca_export.ex_anon_uid,
2058 &arg->ca32_export.ex32_anon_uid) ||
2059 __get_user(karg->ca_export.ex_anon_gid,
2060 &arg->ca32_export.ex32_anon_gid))
2061 return -EFAULT;
2062 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2063 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2064
2065 return 0;
2066 }
2067
2068 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2069 struct compat_nfsctl_arg __user *arg)
2070 {
2071 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2072 sizeof(arg->ca32_getfd)) ||
2073 get_user(karg->ca_version, &arg->ca32_version) ||
2074 __copy_from_user(&karg->ca_getfd.gd_addr,
2075 &arg->ca32_getfd.gd32_addr,
2076 (sizeof(struct sockaddr))) ||
2077 __copy_from_user(&karg->ca_getfd.gd_path,
2078 &arg->ca32_getfd.gd32_path,
2079 (NFS_MAXPATHLEN+1)) ||
2080 __get_user(karg->ca_getfd.gd_version,
2081 &arg->ca32_getfd.gd32_version))
2082 return -EFAULT;
2083
2084 return 0;
2085 }
2086
2087 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2088 struct compat_nfsctl_arg __user *arg)
2089 {
2090 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2091 get_user(karg->ca_version, &arg->ca32_version) ||
2092 __copy_from_user(&karg->ca_getfs.gd_addr,
2093 &arg->ca32_getfs.gd32_addr,
2094 (sizeof(struct sockaddr))) ||
2095 __copy_from_user(&karg->ca_getfs.gd_path,
2096 &arg->ca32_getfs.gd32_path,
2097 (NFS_MAXPATHLEN+1)) ||
2098 __get_user(karg->ca_getfs.gd_maxlen,
2099 &arg->ca32_getfs.gd32_maxlen))
2100 return -EFAULT;
2101
2102 return 0;
2103 }
2104
2105 /* This really doesn't need translations, we are only passing
2106 * back a union which contains opaque nfs file handle data.
2107 */
2108 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2109 union compat_nfsctl_res __user *res)
2110 {
2111 int err;
2112
2113 err = copy_to_user(res, kres, sizeof(*res));
2114
2115 return (err) ? -EFAULT : 0;
2116 }
2117
2118 asmlinkage long compat_sys_nfsservctl(int cmd,
2119 struct compat_nfsctl_arg __user *arg,
2120 union compat_nfsctl_res __user *res)
2121 {
2122 struct nfsctl_arg *karg;
2123 union nfsctl_res *kres;
2124 mm_segment_t oldfs;
2125 int err;
2126
2127 karg = kmalloc(sizeof(*karg), GFP_USER);
2128 kres = kmalloc(sizeof(*kres), GFP_USER);
2129 if(!karg || !kres) {
2130 err = -ENOMEM;
2131 goto done;
2132 }
2133
2134 switch(cmd) {
2135 case NFSCTL_SVC:
2136 err = compat_nfs_svc_trans(karg, arg);
2137 break;
2138
2139 case NFSCTL_ADDCLIENT:
2140 err = compat_nfs_clnt_trans(karg, arg);
2141 break;
2142
2143 case NFSCTL_DELCLIENT:
2144 err = compat_nfs_clnt_trans(karg, arg);
2145 break;
2146
2147 case NFSCTL_EXPORT:
2148 case NFSCTL_UNEXPORT:
2149 err = compat_nfs_exp_trans(karg, arg);
2150 break;
2151
2152 case NFSCTL_GETFD:
2153 err = compat_nfs_getfd_trans(karg, arg);
2154 break;
2155
2156 case NFSCTL_GETFS:
2157 err = compat_nfs_getfs_trans(karg, arg);
2158 break;
2159
2160 default:
2161 err = -EINVAL;
2162 break;
2163 }
2164
2165 if (err)
2166 goto done;
2167
2168 oldfs = get_fs();
2169 set_fs(KERNEL_DS);
2170 /* The __user pointer casts are valid because of the set_fs() */
2171 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2172 set_fs(oldfs);
2173
2174 if (err)
2175 goto done;
2176
2177 if((cmd == NFSCTL_GETFD) ||
2178 (cmd == NFSCTL_GETFS))
2179 err = compat_nfs_getfh_res_trans(kres, res);
2180
2181 done:
2182 kfree(karg);
2183 kfree(kres);
2184 return err;
2185 }
2186 #else /* !NFSD */
2187 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2188 {
2189 return sys_ni_syscall();
2190 }
2191 #endif
2192
2193 #ifdef CONFIG_EPOLL
2194
2195 #ifdef HAVE_SET_RESTORE_SIGMASK
2196 asmlinkage long compat_sys_epoll_pwait(int epfd,
2197 struct compat_epoll_event __user *events,
2198 int maxevents, int timeout,
2199 const compat_sigset_t __user *sigmask,
2200 compat_size_t sigsetsize)
2201 {
2202 long err;
2203 compat_sigset_t csigmask;
2204 sigset_t ksigmask, sigsaved;
2205
2206 /*
2207 * If the caller wants a certain signal mask to be set during the wait,
2208 * we apply it here.
2209 */
2210 if (sigmask) {
2211 if (sigsetsize != sizeof(compat_sigset_t))
2212 return -EINVAL;
2213 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2214 return -EFAULT;
2215 sigset_from_compat(&ksigmask, &csigmask);
2216 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2217 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2218 }
2219
2220 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2221
2222 /*
2223 * If we changed the signal mask, we need to restore the original one.
2224 * In case we've got a signal while waiting, we do not restore the
2225 * signal mask yet, and we allow do_signal() to deliver the signal on
2226 * the way back to userspace, before the signal mask is restored.
2227 */
2228 if (sigmask) {
2229 if (err == -EINTR) {
2230 memcpy(&current->saved_sigmask, &sigsaved,
2231 sizeof(sigsaved));
2232 set_restore_sigmask();
2233 } else
2234 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2235 }
2236
2237 return err;
2238 }
2239 #endif /* HAVE_SET_RESTORE_SIGMASK */
2240
2241 #endif /* CONFIG_EPOLL */
2242
2243 #ifdef CONFIG_SIGNALFD
2244
2245 asmlinkage long compat_sys_signalfd4(int ufd,
2246 const compat_sigset_t __user *sigmask,
2247 compat_size_t sigsetsize, int flags)
2248 {
2249 compat_sigset_t ss32;
2250 sigset_t tmp;
2251 sigset_t __user *ksigmask;
2252
2253 if (sigsetsize != sizeof(compat_sigset_t))
2254 return -EINVAL;
2255 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2256 return -EFAULT;
2257 sigset_from_compat(&tmp, &ss32);
2258 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2259 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2260 return -EFAULT;
2261
2262 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2263 }
2264
2265 asmlinkage long compat_sys_signalfd(int ufd,
2266 const compat_sigset_t __user *sigmask,
2267 compat_size_t sigsetsize)
2268 {
2269 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2270 }
2271 #endif /* CONFIG_SIGNALFD */
2272
2273 #ifdef CONFIG_TIMERFD
2274
2275 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2276 const struct compat_itimerspec __user *utmr,
2277 struct compat_itimerspec __user *otmr)
2278 {
2279 int error;
2280 struct itimerspec t;
2281 struct itimerspec __user *ut;
2282
2283 if (get_compat_itimerspec(&t, utmr))
2284 return -EFAULT;
2285 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2286 if (copy_to_user(&ut[0], &t, sizeof(t)))
2287 return -EFAULT;
2288 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2289 if (!error && otmr)
2290 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2291 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2292
2293 return error;
2294 }
2295
2296 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2297 struct compat_itimerspec __user *otmr)
2298 {
2299 int error;
2300 struct itimerspec t;
2301 struct itimerspec __user *ut;
2302
2303 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2304 error = sys_timerfd_gettime(ufd, ut);
2305 if (!error)
2306 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2307 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2308
2309 return error;
2310 }
2311
2312 #endif /* CONFIG_TIMERFD */
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