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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / fs / compat.c
blob441ef9135179e9ea70db5f57d26b1fd730a1312f
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/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/syscall.h>
44 #include <linux/personality.h>
45 #include <linux/rwsem.h>
46 #include <linux/tsacct_kern.h>
47 #include <linux/security.h>
48 #include <linux/highmem.h>
49 #include <linux/signal.h>
50 #include <linux/poll.h>
51 #include <linux/mm.h>
52 #include <linux/eventpoll.h>
53 #include <linux/fs_struct.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
104 return 0;
105 }
106 return do_utimes(dfd, filename, t ? tv : NULL, flags);
107 }
108
109 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
110 {
111 struct timespec tv[2];
112
113 if (t) {
114 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
115 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
116 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
117 get_user(tv[1].tv_nsec, &t[1].tv_usec))
118 return -EFAULT;
119 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
120 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
121 return -EINVAL;
122 tv[0].tv_nsec *= 1000;
123 tv[1].tv_nsec *= 1000;
124 }
125 return do_utimes(dfd, filename, t ? tv : NULL, 0);
126 }
127
128 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
129 {
130 return compat_sys_futimesat(AT_FDCWD, filename, t);
131 }
132
133 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
134 {
135 compat_ino_t ino = stat->ino;
136 typeof(ubuf->st_uid) uid = 0;
137 typeof(ubuf->st_gid) gid = 0;
138 int err;
139
140 SET_UID(uid, stat->uid);
141 SET_GID(gid, stat->gid);
142
143 if ((u64) stat->size > MAX_NON_LFS ||
144 !old_valid_dev(stat->dev) ||
145 !old_valid_dev(stat->rdev))
146 return -EOVERFLOW;
147 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
148 return -EOVERFLOW;
149
150 if (clear_user(ubuf, sizeof(*ubuf)))
151 return -EFAULT;
152
153 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
154 err |= __put_user(ino, &ubuf->st_ino);
155 err |= __put_user(stat->mode, &ubuf->st_mode);
156 err |= __put_user(stat->nlink, &ubuf->st_nlink);
157 err |= __put_user(uid, &ubuf->st_uid);
158 err |= __put_user(gid, &ubuf->st_gid);
159 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
160 err |= __put_user(stat->size, &ubuf->st_size);
161 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
162 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
163 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
164 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
165 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
166 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
167 err |= __put_user(stat->blksize, &ubuf->st_blksize);
168 err |= __put_user(stat->blocks, &ubuf->st_blocks);
169 return err;
170 }
171
172 asmlinkage long compat_sys_newstat(char __user * filename,
173 struct compat_stat __user *statbuf)
174 {
175 struct kstat stat;
176 int error;
177
178 error = vfs_stat(filename, &stat);
179 if (error)
180 return error;
181 return cp_compat_stat(&stat, statbuf);
182 }
183
184 asmlinkage long compat_sys_newlstat(char __user * filename,
185 struct compat_stat __user *statbuf)
186 {
187 struct kstat stat;
188 int error;
189
190 error = vfs_lstat(filename, &stat);
191 if (error)
192 return error;
193 return cp_compat_stat(&stat, statbuf);
194 }
195
196 #ifndef __ARCH_WANT_STAT64
197 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
198 struct compat_stat __user *statbuf, int flag)
199 {
200 struct kstat stat;
201 int error;
202
203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_compat_stat(&stat, statbuf);
207 }
208 #endif
209
210 asmlinkage long compat_sys_newfstat(unsigned int fd,
211 struct compat_stat __user * statbuf)
212 {
213 struct kstat stat;
214 int error = vfs_fstat(fd, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218 return error;
219 }
220
221 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
222 {
223
224 if (sizeof ubuf->f_blocks == 4) {
225 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
226 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
227 return -EOVERFLOW;
228 /* f_files and f_ffree may be -1; it's okay
229 * to stuff that into 32 bits */
230 if (kbuf->f_files != 0xffffffffffffffffULL
231 && (kbuf->f_files & 0xffffffff00000000ULL))
232 return -EOVERFLOW;
233 if (kbuf->f_ffree != 0xffffffffffffffffULL
234 && (kbuf->f_ffree & 0xffffffff00000000ULL))
235 return -EOVERFLOW;
236 }
237 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
238 __put_user(kbuf->f_type, &ubuf->f_type) ||
239 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
240 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
241 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
242 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
243 __put_user(kbuf->f_files, &ubuf->f_files) ||
244 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
245 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
246 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
247 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
248 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
249 __put_user(0, &ubuf->f_spare[0]) ||
250 __put_user(0, &ubuf->f_spare[1]) ||
251 __put_user(0, &ubuf->f_spare[2]) ||
252 __put_user(0, &ubuf->f_spare[3]) ||
253 __put_user(0, &ubuf->f_spare[4]))
254 return -EFAULT;
255 return 0;
256 }
257
258 /*
259 * The following statfs calls are copies of code from fs/open.c and
260 * should be checked against those from time to time
261 */
262 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
263 {
264 struct path path;
265 int error;
266
267 error = user_path(pathname, &path);
268 if (!error) {
269 struct kstatfs tmp;
270 error = vfs_statfs(path.dentry, &tmp);
271 if (!error)
272 error = put_compat_statfs(buf, &tmp);
273 path_put(&path);
274 }
275 return error;
276 }
277
278 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
279 {
280 struct file * file;
281 struct kstatfs tmp;
282 int error;
283
284 error = -EBADF;
285 file = fget(fd);
286 if (!file)
287 goto out;
288 error = vfs_statfs(file->f_path.dentry, &tmp);
289 if (!error)
290 error = put_compat_statfs(buf, &tmp);
291 fput(file);
292 out:
293 return error;
294 }
295
296 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
297 {
298 if (sizeof ubuf->f_blocks == 4) {
299 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
300 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
301 return -EOVERFLOW;
302 /* f_files and f_ffree may be -1; it's okay
303 * to stuff that into 32 bits */
304 if (kbuf->f_files != 0xffffffffffffffffULL
305 && (kbuf->f_files & 0xffffffff00000000ULL))
306 return -EOVERFLOW;
307 if (kbuf->f_ffree != 0xffffffffffffffffULL
308 && (kbuf->f_ffree & 0xffffffff00000000ULL))
309 return -EOVERFLOW;
310 }
311 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
312 __put_user(kbuf->f_type, &ubuf->f_type) ||
313 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
314 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
315 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
316 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
317 __put_user(kbuf->f_files, &ubuf->f_files) ||
318 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
319 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
320 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
321 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
322 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
323 return -EFAULT;
324 return 0;
325 }
326
327 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
328 {
329 struct path path;
330 int error;
331
332 if (sz != sizeof(*buf))
333 return -EINVAL;
334
335 error = user_path(pathname, &path);
336 if (!error) {
337 struct kstatfs tmp;
338 error = vfs_statfs(path.dentry, &tmp);
339 if (!error)
340 error = put_compat_statfs64(buf, &tmp);
341 path_put(&path);
342 }
343 return error;
344 }
345
346 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
347 {
348 struct file * file;
349 struct kstatfs tmp;
350 int error;
351
352 if (sz != sizeof(*buf))
353 return -EINVAL;
354
355 error = -EBADF;
356 file = fget(fd);
357 if (!file)
358 goto out;
359 error = vfs_statfs(file->f_path.dentry, &tmp);
360 if (!error)
361 error = put_compat_statfs64(buf, &tmp);
362 fput(file);
363 out:
364 return error;
365 }
366
367 /*
368 * This is a copy of sys_ustat, just dealing with a structure layout.
369 * Given how simple this syscall is that apporach is more maintainable
370 * than the various conversion hacks.
371 */
372 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
373 {
374 struct super_block *sb;
375 struct compat_ustat tmp;
376 struct kstatfs sbuf;
377 int err;
378
379 sb = user_get_super(new_decode_dev(dev));
380 if (!sb)
381 return -EINVAL;
382 err = vfs_statfs(sb->s_root, &sbuf);
383 drop_super(sb);
384 if (err)
385 return err;
386
387 memset(&tmp, 0, sizeof(struct compat_ustat));
388 tmp.f_tfree = sbuf.f_bfree;
389 tmp.f_tinode = sbuf.f_ffree;
390 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
391 return -EFAULT;
392 return 0;
393 }
394
395 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
396 {
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405 }
406
407 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
408 {
409 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
410 __put_user(kfl->l_type, &ufl->l_type) ||
411 __put_user(kfl->l_whence, &ufl->l_whence) ||
412 __put_user(kfl->l_start, &ufl->l_start) ||
413 __put_user(kfl->l_len, &ufl->l_len) ||
414 __put_user(kfl->l_pid, &ufl->l_pid))
415 return -EFAULT;
416 return 0;
417 }
418
419 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
420 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
421 {
422 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
423 __get_user(kfl->l_type, &ufl->l_type) ||
424 __get_user(kfl->l_whence, &ufl->l_whence) ||
425 __get_user(kfl->l_start, &ufl->l_start) ||
426 __get_user(kfl->l_len, &ufl->l_len) ||
427 __get_user(kfl->l_pid, &ufl->l_pid))
428 return -EFAULT;
429 return 0;
430 }
431 #endif
432
433 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
434 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
435 {
436 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
437 __put_user(kfl->l_type, &ufl->l_type) ||
438 __put_user(kfl->l_whence, &ufl->l_whence) ||
439 __put_user(kfl->l_start, &ufl->l_start) ||
440 __put_user(kfl->l_len, &ufl->l_len) ||
441 __put_user(kfl->l_pid, &ufl->l_pid))
442 return -EFAULT;
443 return 0;
444 }
445 #endif
446
447 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
448 unsigned long arg)
449 {
450 mm_segment_t old_fs;
451 struct flock f;
452 long ret;
453
454 switch (cmd) {
455 case F_GETLK:
456 case F_SETLK:
457 case F_SETLKW:
458 ret = get_compat_flock(&f, compat_ptr(arg));
459 if (ret != 0)
460 break;
461 old_fs = get_fs();
462 set_fs(KERNEL_DS);
463 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
464 set_fs(old_fs);
465 if (cmd == F_GETLK && ret == 0) {
466 /* GETLK was successful and we need to return the data...
467 * but it needs to fit in the compat structure.
468 * l_start shouldn't be too big, unless the original
469 * start + end is greater than COMPAT_OFF_T_MAX, in which
470 * case the app was asking for trouble, so we return
471 * -EOVERFLOW in that case.
472 * l_len could be too big, in which case we just truncate it,
473 * and only allow the app to see that part of the conflicting
474 * lock that might make sense to it anyway
475 */
476
477 if (f.l_start > COMPAT_OFF_T_MAX)
478 ret = -EOVERFLOW;
479 if (f.l_len > COMPAT_OFF_T_MAX)
480 f.l_len = COMPAT_OFF_T_MAX;
481 if (ret == 0)
482 ret = put_compat_flock(&f, compat_ptr(arg));
483 }
484 break;
485
486 case F_GETLK64:
487 case F_SETLK64:
488 case F_SETLKW64:
489 ret = get_compat_flock64(&f, compat_ptr(arg));
490 if (ret != 0)
491 break;
492 old_fs = get_fs();
493 set_fs(KERNEL_DS);
494 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
495 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
496 (unsigned long)&f);
497 set_fs(old_fs);
498 if (cmd == F_GETLK64 && ret == 0) {
499 /* need to return lock information - see above for commentary */
500 if (f.l_start > COMPAT_LOFF_T_MAX)
501 ret = -EOVERFLOW;
502 if (f.l_len > COMPAT_LOFF_T_MAX)
503 f.l_len = COMPAT_LOFF_T_MAX;
504 if (ret == 0)
505 ret = put_compat_flock64(&f, compat_ptr(arg));
506 }
507 break;
508
509 default:
510 ret = sys_fcntl(fd, cmd, arg);
511 break;
512 }
513 return ret;
514 }
515
516 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
517 unsigned long arg)
518 {
519 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
520 return -EINVAL;
521 return compat_sys_fcntl64(fd, cmd, arg);
522 }
523
524 asmlinkage long
525 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
526 {
527 long ret;
528 aio_context_t ctx64;
529
530 mm_segment_t oldfs = get_fs();
531 if (unlikely(get_user(ctx64, ctx32p)))
532 return -EFAULT;
533
534 set_fs(KERNEL_DS);
535 /* The __user pointer cast is valid because of the set_fs() */
536 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
537 set_fs(oldfs);
538 /* truncating is ok because it's a user address */
539 if (!ret)
540 ret = put_user((u32) ctx64, ctx32p);
541 return ret;
542 }
543
544 asmlinkage long
545 compat_sys_io_getevents(aio_context_t ctx_id,
546 unsigned long min_nr,
547 unsigned long nr,
548 struct io_event __user *events,
549 struct compat_timespec __user *timeout)
550 {
551 long ret;
552 struct timespec t;
553 struct timespec __user *ut = NULL;
554
555 ret = -EFAULT;
556 if (unlikely(!access_ok(VERIFY_WRITE, events,
557 nr * sizeof(struct io_event))))
558 goto out;
559 if (timeout) {
560 if (get_compat_timespec(&t, timeout))
561 goto out;
562
563 ut = compat_alloc_user_space(sizeof(*ut));
564 if (copy_to_user(ut, &t, sizeof(t)) )
565 goto out;
566 }
567 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
568 out:
569 return ret;
570 }
571
572 static inline long
573 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
574 {
575 compat_uptr_t uptr;
576 int i;
577
578 for (i = 0; i < nr; ++i) {
579 if (get_user(uptr, ptr32 + i))
580 return -EFAULT;
581 if (put_user(compat_ptr(uptr), ptr64 + i))
582 return -EFAULT;
583 }
584 return 0;
585 }
586
587 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
588
589 asmlinkage long
590 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
591 {
592 struct iocb __user * __user *iocb64;
593 long ret;
594
595 if (unlikely(nr < 0))
596 return -EINVAL;
597
598 if (nr > MAX_AIO_SUBMITS)
599 nr = MAX_AIO_SUBMITS;
600
601 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
602 ret = copy_iocb(nr, iocb, iocb64);
603 if (!ret)
604 ret = sys_io_submit(ctx_id, nr, iocb64);
605 return ret;
606 }
607
608 struct compat_ncp_mount_data {
609 compat_int_t version;
610 compat_uint_t ncp_fd;
611 __compat_uid_t mounted_uid;
612 compat_pid_t wdog_pid;
613 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
614 compat_uint_t time_out;
615 compat_uint_t retry_count;
616 compat_uint_t flags;
617 __compat_uid_t uid;
618 __compat_gid_t gid;
619 compat_mode_t file_mode;
620 compat_mode_t dir_mode;
621 };
622
623 struct compat_ncp_mount_data_v4 {
624 compat_int_t version;
625 compat_ulong_t flags;
626 compat_ulong_t mounted_uid;
627 compat_long_t wdog_pid;
628 compat_uint_t ncp_fd;
629 compat_uint_t time_out;
630 compat_uint_t retry_count;
631 compat_ulong_t uid;
632 compat_ulong_t gid;
633 compat_ulong_t file_mode;
634 compat_ulong_t dir_mode;
635 };
636
637 static void *do_ncp_super_data_conv(void *raw_data)
638 {
639 int version = *(unsigned int *)raw_data;
640
641 if (version == 3) {
642 struct compat_ncp_mount_data *c_n = raw_data;
643 struct ncp_mount_data *n = raw_data;
644
645 n->dir_mode = c_n->dir_mode;
646 n->file_mode = c_n->file_mode;
647 n->gid = c_n->gid;
648 n->uid = c_n->uid;
649 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
650 n->wdog_pid = c_n->wdog_pid;
651 n->mounted_uid = c_n->mounted_uid;
652 } else if (version == 4) {
653 struct compat_ncp_mount_data_v4 *c_n = raw_data;
654 struct ncp_mount_data_v4 *n = raw_data;
655
656 n->dir_mode = c_n->dir_mode;
657 n->file_mode = c_n->file_mode;
658 n->gid = c_n->gid;
659 n->uid = c_n->uid;
660 n->retry_count = c_n->retry_count;
661 n->time_out = c_n->time_out;
662 n->ncp_fd = c_n->ncp_fd;
663 n->wdog_pid = c_n->wdog_pid;
664 n->mounted_uid = c_n->mounted_uid;
665 n->flags = c_n->flags;
666 } else if (version != 5) {
667 return NULL;
668 }
669
670 return raw_data;
671 }
672
673 struct compat_smb_mount_data {
674 compat_int_t version;
675 __compat_uid_t mounted_uid;
676 __compat_uid_t uid;
677 __compat_gid_t gid;
678 compat_mode_t file_mode;
679 compat_mode_t dir_mode;
680 };
681
682 static void *do_smb_super_data_conv(void *raw_data)
683 {
684 struct smb_mount_data *s = raw_data;
685 struct compat_smb_mount_data *c_s = raw_data;
686
687 if (c_s->version != SMB_MOUNT_OLDVERSION)
688 goto out;
689 s->dir_mode = c_s->dir_mode;
690 s->file_mode = c_s->file_mode;
691 s->gid = c_s->gid;
692 s->uid = c_s->uid;
693 s->mounted_uid = c_s->mounted_uid;
694 out:
695 return raw_data;
696 }
697
698 struct compat_nfs_string {
699 compat_uint_t len;
700 compat_uptr_t data;
701 };
702
703 static inline void compat_nfs_string(struct nfs_string *dst,
704 struct compat_nfs_string *src)
705 {
706 dst->data = compat_ptr(src->data);
707 dst->len = src->len;
708 }
709
710 struct compat_nfs4_mount_data_v1 {
711 compat_int_t version;
712 compat_int_t flags;
713 compat_int_t rsize;
714 compat_int_t wsize;
715 compat_int_t timeo;
716 compat_int_t retrans;
717 compat_int_t acregmin;
718 compat_int_t acregmax;
719 compat_int_t acdirmin;
720 compat_int_t acdirmax;
721 struct compat_nfs_string client_addr;
722 struct compat_nfs_string mnt_path;
723 struct compat_nfs_string hostname;
724 compat_uint_t host_addrlen;
725 compat_uptr_t host_addr;
726 compat_int_t proto;
727 compat_int_t auth_flavourlen;
728 compat_uptr_t auth_flavours;
729 };
730
731 static int do_nfs4_super_data_conv(void *raw_data)
732 {
733 int version = *(compat_uint_t *) raw_data;
734
735 if (version == 1) {
736 struct compat_nfs4_mount_data_v1 *raw = raw_data;
737 struct nfs4_mount_data *real = raw_data;
738
739 /* copy the fields backwards */
740 real->auth_flavours = compat_ptr(raw->auth_flavours);
741 real->auth_flavourlen = raw->auth_flavourlen;
742 real->proto = raw->proto;
743 real->host_addr = compat_ptr(raw->host_addr);
744 real->host_addrlen = raw->host_addrlen;
745 compat_nfs_string(&real->hostname, &raw->hostname);
746 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
747 compat_nfs_string(&real->client_addr, &raw->client_addr);
748 real->acdirmax = raw->acdirmax;
749 real->acdirmin = raw->acdirmin;
750 real->acregmax = raw->acregmax;
751 real->acregmin = raw->acregmin;
752 real->retrans = raw->retrans;
753 real->timeo = raw->timeo;
754 real->wsize = raw->wsize;
755 real->rsize = raw->rsize;
756 real->flags = raw->flags;
757 real->version = raw->version;
758 }
759
760 return 0;
761 }
762
763 #define SMBFS_NAME "smbfs"
764 #define NCPFS_NAME "ncpfs"
765 #define NFS4_NAME "nfs4"
766
767 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
768 char __user * type, unsigned long flags,
769 void __user * data)
770 {
771 char *kernel_type;
772 unsigned long data_page;
773 char *kernel_dev;
774 char *dir_page;
775 int retval;
776
777 retval = copy_mount_string(type, &kernel_type);
778 if (retval < 0)
779 goto out;
780
781 dir_page = getname(dir_name);
782 retval = PTR_ERR(dir_page);
783 if (IS_ERR(dir_page))
784 goto out1;
785
786 retval = copy_mount_string(dev_name, &kernel_dev);
787 if (retval < 0)
788 goto out2;
789
790 retval = copy_mount_options(data, &data_page);
791 if (retval < 0)
792 goto out3;
793
794 retval = -EINVAL;
795
796 if (kernel_type && data_page) {
797 if (!strcmp(kernel_type, SMBFS_NAME)) {
798 do_smb_super_data_conv((void *)data_page);
799 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
800 do_ncp_super_data_conv((void *)data_page);
801 } else if (!strcmp(kernel_type, NFS4_NAME)) {
802 if (do_nfs4_super_data_conv((void *) data_page))
803 goto out4;
804 }
805 }
806
807 retval = do_mount(kernel_dev, dir_page, kernel_type,
808 flags, (void*)data_page);
809
810 out4:
811 free_page(data_page);
812 out3:
813 kfree(kernel_dev);
814 out2:
815 putname(dir_page);
816 out1:
817 kfree(kernel_type);
818 out:
819 return retval;
820 }
821
822 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
823
824 struct compat_old_linux_dirent {
825 compat_ulong_t d_ino;
826 compat_ulong_t d_offset;
827 unsigned short d_namlen;
828 char d_name[1];
829 };
830
831 struct compat_readdir_callback {
832 struct compat_old_linux_dirent __user *dirent;
833 int result;
834 };
835
836 static int compat_fillonedir(void *__buf, const char *name, int namlen,
837 loff_t offset, u64 ino, unsigned int d_type)
838 {
839 struct compat_readdir_callback *buf = __buf;
840 struct compat_old_linux_dirent __user *dirent;
841 compat_ulong_t d_ino;
842
843 if (buf->result)
844 return -EINVAL;
845 d_ino = ino;
846 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
847 buf->result = -EOVERFLOW;
848 return -EOVERFLOW;
849 }
850 buf->result++;
851 dirent = buf->dirent;
852 if (!access_ok(VERIFY_WRITE, dirent,
853 (unsigned long)(dirent->d_name + namlen + 1) -
854 (unsigned long)dirent))
855 goto efault;
856 if ( __put_user(d_ino, &dirent->d_ino) ||
857 __put_user(offset, &dirent->d_offset) ||
858 __put_user(namlen, &dirent->d_namlen) ||
859 __copy_to_user(dirent->d_name, name, namlen) ||
860 __put_user(0, dirent->d_name + namlen))
861 goto efault;
862 return 0;
863 efault:
864 buf->result = -EFAULT;
865 return -EFAULT;
866 }
867
868 asmlinkage long compat_sys_old_readdir(unsigned int fd,
869 struct compat_old_linux_dirent __user *dirent, unsigned int count)
870 {
871 int error;
872 struct file *file;
873 struct compat_readdir_callback buf;
874
875 error = -EBADF;
876 file = fget(fd);
877 if (!file)
878 goto out;
879
880 buf.result = 0;
881 buf.dirent = dirent;
882
883 error = vfs_readdir(file, compat_fillonedir, &buf);
884 if (buf.result)
885 error = buf.result;
886
887 fput(file);
888 out:
889 return error;
890 }
891
892 struct compat_linux_dirent {
893 compat_ulong_t d_ino;
894 compat_ulong_t d_off;
895 unsigned short d_reclen;
896 char d_name[1];
897 };
898
899 struct compat_getdents_callback {
900 struct compat_linux_dirent __user *current_dir;
901 struct compat_linux_dirent __user *previous;
902 int count;
903 int error;
904 };
905
906 static int compat_filldir(void *__buf, const char *name, int namlen,
907 loff_t offset, u64 ino, unsigned int d_type)
908 {
909 struct compat_linux_dirent __user * dirent;
910 struct compat_getdents_callback *buf = __buf;
911 compat_ulong_t d_ino;
912 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
913
914 buf->error = -EINVAL; /* only used if we fail.. */
915 if (reclen > buf->count)
916 return -EINVAL;
917 d_ino = ino;
918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->error = -EOVERFLOW;
920 return -EOVERFLOW;
921 }
922 dirent = buf->previous;
923 if (dirent) {
924 if (__put_user(offset, &dirent->d_off))
925 goto efault;
926 }
927 dirent = buf->current_dir;
928 if (__put_user(d_ino, &dirent->d_ino))
929 goto efault;
930 if (__put_user(reclen, &dirent->d_reclen))
931 goto efault;
932 if (copy_to_user(dirent->d_name, name, namlen))
933 goto efault;
934 if (__put_user(0, dirent->d_name + namlen))
935 goto efault;
936 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
937 goto efault;
938 buf->previous = dirent;
939 dirent = (void __user *)dirent + reclen;
940 buf->current_dir = dirent;
941 buf->count -= reclen;
942 return 0;
943 efault:
944 buf->error = -EFAULT;
945 return -EFAULT;
946 }
947
948 asmlinkage long compat_sys_getdents(unsigned int fd,
949 struct compat_linux_dirent __user *dirent, unsigned int count)
950 {
951 struct file * file;
952 struct compat_linux_dirent __user * lastdirent;
953 struct compat_getdents_callback buf;
954 int error;
955
956 error = -EFAULT;
957 if (!access_ok(VERIFY_WRITE, dirent, count))
958 goto out;
959
960 error = -EBADF;
961 file = fget(fd);
962 if (!file)
963 goto out;
964
965 buf.current_dir = dirent;
966 buf.previous = NULL;
967 buf.count = count;
968 buf.error = 0;
969
970 error = vfs_readdir(file, compat_filldir, &buf);
971 if (error >= 0)
972 error = buf.error;
973 lastdirent = buf.previous;
974 if (lastdirent) {
975 if (put_user(file->f_pos, &lastdirent->d_off))
976 error = -EFAULT;
977 else
978 error = count - buf.count;
979 }
980 fput(file);
981 out:
982 return error;
983 }
984
985 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
986
987 struct compat_getdents_callback64 {
988 struct linux_dirent64 __user *current_dir;
989 struct linux_dirent64 __user *previous;
990 int count;
991 int error;
992 };
993
994 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
995 u64 ino, unsigned int d_type)
996 {
997 struct linux_dirent64 __user *dirent;
998 struct compat_getdents_callback64 *buf = __buf;
999 int jj = NAME_OFFSET(dirent);
1000 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1001 u64 off;
1002
1003 buf->error = -EINVAL; /* only used if we fail.. */
1004 if (reclen > buf->count)
1005 return -EINVAL;
1006 dirent = buf->previous;
1007
1008 if (dirent) {
1009 if (__put_user_unaligned(offset, &dirent->d_off))
1010 goto efault;
1011 }
1012 dirent = buf->current_dir;
1013 if (__put_user_unaligned(ino, &dirent->d_ino))
1014 goto efault;
1015 off = 0;
1016 if (__put_user_unaligned(off, &dirent->d_off))
1017 goto efault;
1018 if (__put_user(reclen, &dirent->d_reclen))
1019 goto efault;
1020 if (__put_user(d_type, &dirent->d_type))
1021 goto efault;
1022 if (copy_to_user(dirent->d_name, name, namlen))
1023 goto efault;
1024 if (__put_user(0, dirent->d_name + namlen))
1025 goto efault;
1026 buf->previous = dirent;
1027 dirent = (void __user *)dirent + reclen;
1028 buf->current_dir = dirent;
1029 buf->count -= reclen;
1030 return 0;
1031 efault:
1032 buf->error = -EFAULT;
1033 return -EFAULT;
1034 }
1035
1036 asmlinkage long compat_sys_getdents64(unsigned int fd,
1037 struct linux_dirent64 __user * dirent, unsigned int count)
1038 {
1039 struct file * file;
1040 struct linux_dirent64 __user * lastdirent;
1041 struct compat_getdents_callback64 buf;
1042 int error;
1043
1044 error = -EFAULT;
1045 if (!access_ok(VERIFY_WRITE, dirent, count))
1046 goto out;
1047
1048 error = -EBADF;
1049 file = fget(fd);
1050 if (!file)
1051 goto out;
1052
1053 buf.current_dir = dirent;
1054 buf.previous = NULL;
1055 buf.count = count;
1056 buf.error = 0;
1057
1058 error = vfs_readdir(file, compat_filldir64, &buf);
1059 if (error >= 0)
1060 error = buf.error;
1061 lastdirent = buf.previous;
1062 if (lastdirent) {
1063 typeof(lastdirent->d_off) d_off = file->f_pos;
1064 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1065 error = -EFAULT;
1066 else
1067 error = count - buf.count;
1068 }
1069 fput(file);
1070 out:
1071 return error;
1072 }
1073 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1074
1075 static ssize_t compat_do_readv_writev(int type, struct file *file,
1076 const struct compat_iovec __user *uvector,
1077 unsigned long nr_segs, loff_t *pos)
1078 {
1079 compat_ssize_t tot_len;
1080 struct iovec iovstack[UIO_FASTIOV];
1081 struct iovec *iov=iovstack, *vector;
1082 ssize_t ret;
1083 int seg;
1084 io_fn_t fn;
1085 iov_fn_t fnv;
1086
1087 /*
1088 * SuS says "The readv() function *may* fail if the iovcnt argument
1089 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1090 * traditionally returned zero for zero segments, so...
1091 */
1092 ret = 0;
1093 if (nr_segs == 0)
1094 goto out;
1095
1096 /*
1097 * First get the "struct iovec" from user memory and
1098 * verify all the pointers
1099 */
1100 ret = -EINVAL;
1101 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1102 goto out;
1103 if (!file->f_op)
1104 goto out;
1105 if (nr_segs > UIO_FASTIOV) {
1106 ret = -ENOMEM;
1107 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1108 if (!iov)
1109 goto out;
1110 }
1111 ret = -EFAULT;
1112 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1113 goto out;
1114
1115 /*
1116 * Single unix specification:
1117 * We should -EINVAL if an element length is not >= 0 and fitting an
1118 * ssize_t. The total length is fitting an ssize_t
1119 *
1120 * Be careful here because iov_len is a size_t not an ssize_t
1121 */
1122 tot_len = 0;
1123 vector = iov;
1124 ret = -EINVAL;
1125 for (seg = 0 ; seg < nr_segs; seg++) {
1126 compat_ssize_t tmp = tot_len;
1127 compat_ssize_t len;
1128 compat_uptr_t buf;
1129
1130 if (__get_user(len, &uvector->iov_len) ||
1131 __get_user(buf, &uvector->iov_base)) {
1132 ret = -EFAULT;
1133 goto out;
1134 }
1135 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1136 goto out;
1137 tot_len += len;
1138 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1139 goto out;
1140 vector->iov_base = compat_ptr(buf);
1141 vector->iov_len = (compat_size_t) len;
1142 uvector++;
1143 vector++;
1144 }
1145 if (tot_len == 0) {
1146 ret = 0;
1147 goto out;
1148 }
1149
1150 ret = rw_verify_area(type, file, pos, tot_len);
1151 if (ret < 0)
1152 goto out;
1153
1154 fnv = NULL;
1155 if (type == READ) {
1156 fn = file->f_op->read;
1157 fnv = file->f_op->aio_read;
1158 } else {
1159 fn = (io_fn_t)file->f_op->write;
1160 fnv = file->f_op->aio_write;
1161 }
1162
1163 if (fnv)
1164 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1165 pos, fnv);
1166 else
1167 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1168
1169 out:
1170 if (iov != iovstack)
1171 kfree(iov);
1172 if ((ret + (type == READ)) > 0) {
1173 if (type == READ)
1174 fsnotify_access(file);
1175 else
1176 fsnotify_modify(file);
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 /* execve succeeded */
1535 current->fs->in_exec = 0;
1536 current->in_execve = 0;
1537 acct_update_integrals(current);
1538 free_bprm(bprm);
1539 if (displaced)
1540 put_files_struct(displaced);
1541 return retval;
1542
1543 out:
1544 if (bprm->mm)
1545 mmput(bprm->mm);
1546
1547 out_file:
1548 if (bprm->file) {
1549 allow_write_access(bprm->file);
1550 fput(bprm->file);
1551 }
1552
1553 out_unmark:
1554 if (clear_in_exec)
1555 current->fs->in_exec = 0;
1556 current->in_execve = 0;
1557
1558 out_free:
1559 free_bprm(bprm);
1560
1561 out_files:
1562 if (displaced)
1563 reset_files_struct(displaced);
1564 out_ret:
1565 return retval;
1566 }
1567
1568 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1569
1570 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1571 int timeval, int ret)
1572 {
1573 struct timespec ts;
1574
1575 if (!p)
1576 return ret;
1577
1578 if (current->personality & STICKY_TIMEOUTS)
1579 goto sticky;
1580
1581 /* No update for zero timeout */
1582 if (!end_time->tv_sec && !end_time->tv_nsec)
1583 return ret;
1584
1585 ktime_get_ts(&ts);
1586 ts = timespec_sub(*end_time, ts);
1587 if (ts.tv_sec < 0)
1588 ts.tv_sec = ts.tv_nsec = 0;
1589
1590 if (timeval) {
1591 struct compat_timeval rtv;
1592
1593 rtv.tv_sec = ts.tv_sec;
1594 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1595
1596 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1597 return ret;
1598 } else {
1599 struct compat_timespec rts;
1600
1601 rts.tv_sec = ts.tv_sec;
1602 rts.tv_nsec = ts.tv_nsec;
1603
1604 if (!copy_to_user(p, &rts, sizeof(rts)))
1605 return ret;
1606 }
1607 /*
1608 * If an application puts its timeval in read-only memory, we
1609 * don't want the Linux-specific update to the timeval to
1610 * cause a fault after the select has completed
1611 * successfully. However, because we're not updating the
1612 * timeval, we can't restart the system call.
1613 */
1614
1615 sticky:
1616 if (ret == -ERESTARTNOHAND)
1617 ret = -EINTR;
1618 return ret;
1619 }
1620
1621 /*
1622 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1623 * 64-bit unsigned longs.
1624 */
1625 static
1626 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1627 unsigned long *fdset)
1628 {
1629 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1630 if (ufdset) {
1631 unsigned long odd;
1632
1633 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1634 return -EFAULT;
1635
1636 odd = nr & 1UL;
1637 nr &= ~1UL;
1638 while (nr) {
1639 unsigned long h, l;
1640 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1641 return -EFAULT;
1642 ufdset += 2;
1643 *fdset++ = h << 32 | l;
1644 nr -= 2;
1645 }
1646 if (odd && __get_user(*fdset, ufdset))
1647 return -EFAULT;
1648 } else {
1649 /* Tricky, must clear full unsigned long in the
1650 * kernel fdset at the end, this makes sure that
1651 * actually happens.
1652 */
1653 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1654 }
1655 return 0;
1656 }
1657
1658 static
1659 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1660 unsigned long *fdset)
1661 {
1662 unsigned long odd;
1663 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1664
1665 if (!ufdset)
1666 return 0;
1667
1668 odd = nr & 1UL;
1669 nr &= ~1UL;
1670 while (nr) {
1671 unsigned long h, l;
1672 l = *fdset++;
1673 h = l >> 32;
1674 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1675 return -EFAULT;
1676 ufdset += 2;
1677 nr -= 2;
1678 }
1679 if (odd && __put_user(*fdset, ufdset))
1680 return -EFAULT;
1681 return 0;
1682 }
1683
1684
1685 /*
1686 * This is a virtual copy of sys_select from fs/select.c and probably
1687 * should be compared to it from time to time
1688 */
1689
1690 /*
1691 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1692 * like to be certain this leads to no problems. So I return
1693 * EINTR just for safety.
1694 *
1695 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1696 * I'm trying ERESTARTNOHAND which restart only when you want to.
1697 */
1698 #define MAX_SELECT_SECONDS \
1699 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1700
1701 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1702 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1703 struct timespec *end_time)
1704 {
1705 fd_set_bits fds;
1706 void *bits;
1707 int size, max_fds, ret = -EINVAL;
1708 struct fdtable *fdt;
1709 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1710
1711 if (n < 0)
1712 goto out_nofds;
1713
1714 /* max_fds can increase, so grab it once to avoid race */
1715 rcu_read_lock();
1716 fdt = files_fdtable(current->files);
1717 max_fds = fdt->max_fds;
1718 rcu_read_unlock();
1719 if (n > max_fds)
1720 n = max_fds;
1721
1722 /*
1723 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1724 * since we used fdset we need to allocate memory in units of
1725 * long-words.
1726 */
1727 size = FDS_BYTES(n);
1728 bits = stack_fds;
1729 if (size > sizeof(stack_fds) / 6) {
1730 bits = kmalloc(6 * size, GFP_KERNEL);
1731 ret = -ENOMEM;
1732 if (!bits)
1733 goto out_nofds;
1734 }
1735 fds.in = (unsigned long *) bits;
1736 fds.out = (unsigned long *) (bits + size);
1737 fds.ex = (unsigned long *) (bits + 2*size);
1738 fds.res_in = (unsigned long *) (bits + 3*size);
1739 fds.res_out = (unsigned long *) (bits + 4*size);
1740 fds.res_ex = (unsigned long *) (bits + 5*size);
1741
1742 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1743 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1744 (ret = compat_get_fd_set(n, exp, fds.ex)))
1745 goto out;
1746 zero_fd_set(n, fds.res_in);
1747 zero_fd_set(n, fds.res_out);
1748 zero_fd_set(n, fds.res_ex);
1749
1750 ret = do_select(n, &fds, end_time);
1751
1752 if (ret < 0)
1753 goto out;
1754 if (!ret) {
1755 ret = -ERESTARTNOHAND;
1756 if (signal_pending(current))
1757 goto out;
1758 ret = 0;
1759 }
1760
1761 if (compat_set_fd_set(n, inp, fds.res_in) ||
1762 compat_set_fd_set(n, outp, fds.res_out) ||
1763 compat_set_fd_set(n, exp, fds.res_ex))
1764 ret = -EFAULT;
1765 out:
1766 if (bits != stack_fds)
1767 kfree(bits);
1768 out_nofds:
1769 return ret;
1770 }
1771
1772 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1773 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1774 struct compat_timeval __user *tvp)
1775 {
1776 struct timespec end_time, *to = NULL;
1777 struct compat_timeval tv;
1778 int ret;
1779
1780 if (tvp) {
1781 if (copy_from_user(&tv, tvp, sizeof(tv)))
1782 return -EFAULT;
1783
1784 to = &end_time;
1785 if (poll_select_set_timeout(to,
1786 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1787 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1788 return -EINVAL;
1789 }
1790
1791 ret = compat_core_sys_select(n, inp, outp, exp, to);
1792 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1793
1794 return ret;
1795 }
1796
1797 #ifdef HAVE_SET_RESTORE_SIGMASK
1798 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1799 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1800 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1801 compat_size_t sigsetsize)
1802 {
1803 compat_sigset_t ss32;
1804 sigset_t ksigmask, sigsaved;
1805 struct compat_timespec ts;
1806 struct timespec end_time, *to = NULL;
1807 int ret;
1808
1809 if (tsp) {
1810 if (copy_from_user(&ts, tsp, sizeof(ts)))
1811 return -EFAULT;
1812
1813 to = &end_time;
1814 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1815 return -EINVAL;
1816 }
1817
1818 if (sigmask) {
1819 if (sigsetsize != sizeof(compat_sigset_t))
1820 return -EINVAL;
1821 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1822 return -EFAULT;
1823 sigset_from_compat(&ksigmask, &ss32);
1824
1825 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1826 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1827 }
1828
1829 ret = compat_core_sys_select(n, inp, outp, exp, to);
1830 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1831
1832 if (ret == -ERESTARTNOHAND) {
1833 /*
1834 * Don't restore the signal mask yet. Let do_signal() deliver
1835 * the signal on the way back to userspace, before the signal
1836 * mask is restored.
1837 */
1838 if (sigmask) {
1839 memcpy(&current->saved_sigmask, &sigsaved,
1840 sizeof(sigsaved));
1841 set_restore_sigmask();
1842 }
1843 } else if (sigmask)
1844 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1845
1846 return ret;
1847 }
1848
1849 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1850 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1851 struct compat_timespec __user *tsp, void __user *sig)
1852 {
1853 compat_size_t sigsetsize = 0;
1854 compat_uptr_t up = 0;
1855
1856 if (sig) {
1857 if (!access_ok(VERIFY_READ, sig,
1858 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1859 __get_user(up, (compat_uptr_t __user *)sig) ||
1860 __get_user(sigsetsize,
1861 (compat_size_t __user *)(sig+sizeof(up))))
1862 return -EFAULT;
1863 }
1864 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1865 sigsetsize);
1866 }
1867
1868 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1869 unsigned int nfds, struct compat_timespec __user *tsp,
1870 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1871 {
1872 compat_sigset_t ss32;
1873 sigset_t ksigmask, sigsaved;
1874 struct compat_timespec ts;
1875 struct timespec end_time, *to = NULL;
1876 int ret;
1877
1878 if (tsp) {
1879 if (copy_from_user(&ts, tsp, sizeof(ts)))
1880 return -EFAULT;
1881
1882 to = &end_time;
1883 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1884 return -EINVAL;
1885 }
1886
1887 if (sigmask) {
1888 if (sigsetsize != sizeof(compat_sigset_t))
1889 return -EINVAL;
1890 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1891 return -EFAULT;
1892 sigset_from_compat(&ksigmask, &ss32);
1893
1894 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1895 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1896 }
1897
1898 ret = do_sys_poll(ufds, nfds, to);
1899
1900 /* We can restart this syscall, usually */
1901 if (ret == -EINTR) {
1902 /*
1903 * Don't restore the signal mask yet. Let do_signal() deliver
1904 * the signal on the way back to userspace, before the signal
1905 * mask is restored.
1906 */
1907 if (sigmask) {
1908 memcpy(&current->saved_sigmask, &sigsaved,
1909 sizeof(sigsaved));
1910 set_restore_sigmask();
1911 }
1912 ret = -ERESTARTNOHAND;
1913 } else if (sigmask)
1914 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1915
1916 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1917
1918 return ret;
1919 }
1920 #endif /* HAVE_SET_RESTORE_SIGMASK */
1921
1922 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1923 /* Stuff for NFS server syscalls... */
1924 struct compat_nfsctl_svc {
1925 u16 svc32_port;
1926 s32 svc32_nthreads;
1927 };
1928
1929 struct compat_nfsctl_client {
1930 s8 cl32_ident[NFSCLNT_IDMAX+1];
1931 s32 cl32_naddr;
1932 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1933 s32 cl32_fhkeytype;
1934 s32 cl32_fhkeylen;
1935 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1936 };
1937
1938 struct compat_nfsctl_export {
1939 char ex32_client[NFSCLNT_IDMAX+1];
1940 char ex32_path[NFS_MAXPATHLEN+1];
1941 compat_dev_t ex32_dev;
1942 compat_ino_t ex32_ino;
1943 compat_int_t ex32_flags;
1944 __compat_uid_t ex32_anon_uid;
1945 __compat_gid_t ex32_anon_gid;
1946 };
1947
1948 struct compat_nfsctl_fdparm {
1949 struct sockaddr gd32_addr;
1950 s8 gd32_path[NFS_MAXPATHLEN+1];
1951 compat_int_t gd32_version;
1952 };
1953
1954 struct compat_nfsctl_fsparm {
1955 struct sockaddr gd32_addr;
1956 s8 gd32_path[NFS_MAXPATHLEN+1];
1957 compat_int_t gd32_maxlen;
1958 };
1959
1960 struct compat_nfsctl_arg {
1961 compat_int_t ca32_version; /* safeguard */
1962 union {
1963 struct compat_nfsctl_svc u32_svc;
1964 struct compat_nfsctl_client u32_client;
1965 struct compat_nfsctl_export u32_export;
1966 struct compat_nfsctl_fdparm u32_getfd;
1967 struct compat_nfsctl_fsparm u32_getfs;
1968 } u;
1969 #define ca32_svc u.u32_svc
1970 #define ca32_client u.u32_client
1971 #define ca32_export u.u32_export
1972 #define ca32_getfd u.u32_getfd
1973 #define ca32_getfs u.u32_getfs
1974 };
1975
1976 union compat_nfsctl_res {
1977 __u8 cr32_getfh[NFS_FHSIZE];
1978 struct knfsd_fh cr32_getfs;
1979 };
1980
1981 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1982 struct compat_nfsctl_arg __user *arg)
1983 {
1984 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1985 get_user(karg->ca_version, &arg->ca32_version) ||
1986 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1987 __get_user(karg->ca_svc.svc_nthreads,
1988 &arg->ca32_svc.svc32_nthreads))
1989 return -EFAULT;
1990 return 0;
1991 }
1992
1993 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1994 struct compat_nfsctl_arg __user *arg)
1995 {
1996 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1997 sizeof(arg->ca32_client)) ||
1998 get_user(karg->ca_version, &arg->ca32_version) ||
1999 __copy_from_user(&karg->ca_client.cl_ident[0],
2000 &arg->ca32_client.cl32_ident[0],
2001 NFSCLNT_IDMAX) ||
2002 __get_user(karg->ca_client.cl_naddr,
2003 &arg->ca32_client.cl32_naddr) ||
2004 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2005 &arg->ca32_client.cl32_addrlist[0],
2006 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2007 __get_user(karg->ca_client.cl_fhkeytype,
2008 &arg->ca32_client.cl32_fhkeytype) ||
2009 __get_user(karg->ca_client.cl_fhkeylen,
2010 &arg->ca32_client.cl32_fhkeylen) ||
2011 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2012 &arg->ca32_client.cl32_fhkey[0],
2013 NFSCLNT_KEYMAX))
2014 return -EFAULT;
2015
2016 return 0;
2017 }
2018
2019 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2020 struct compat_nfsctl_arg __user *arg)
2021 {
2022 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2023 sizeof(arg->ca32_export)) ||
2024 get_user(karg->ca_version, &arg->ca32_version) ||
2025 __copy_from_user(&karg->ca_export.ex_client[0],
2026 &arg->ca32_export.ex32_client[0],
2027 NFSCLNT_IDMAX) ||
2028 __copy_from_user(&karg->ca_export.ex_path[0],
2029 &arg->ca32_export.ex32_path[0],
2030 NFS_MAXPATHLEN) ||
2031 __get_user(karg->ca_export.ex_dev,
2032 &arg->ca32_export.ex32_dev) ||
2033 __get_user(karg->ca_export.ex_ino,
2034 &arg->ca32_export.ex32_ino) ||
2035 __get_user(karg->ca_export.ex_flags,
2036 &arg->ca32_export.ex32_flags) ||
2037 __get_user(karg->ca_export.ex_anon_uid,
2038 &arg->ca32_export.ex32_anon_uid) ||
2039 __get_user(karg->ca_export.ex_anon_gid,
2040 &arg->ca32_export.ex32_anon_gid))
2041 return -EFAULT;
2042 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2043 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2044
2045 return 0;
2046 }
2047
2048 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2049 struct compat_nfsctl_arg __user *arg)
2050 {
2051 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2052 sizeof(arg->ca32_getfd)) ||
2053 get_user(karg->ca_version, &arg->ca32_version) ||
2054 __copy_from_user(&karg->ca_getfd.gd_addr,
2055 &arg->ca32_getfd.gd32_addr,
2056 (sizeof(struct sockaddr))) ||
2057 __copy_from_user(&karg->ca_getfd.gd_path,
2058 &arg->ca32_getfd.gd32_path,
2059 (NFS_MAXPATHLEN+1)) ||
2060 __get_user(karg->ca_getfd.gd_version,
2061 &arg->ca32_getfd.gd32_version))
2062 return -EFAULT;
2063
2064 return 0;
2065 }
2066
2067 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2068 struct compat_nfsctl_arg __user *arg)
2069 {
2070 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2071 get_user(karg->ca_version, &arg->ca32_version) ||
2072 __copy_from_user(&karg->ca_getfs.gd_addr,
2073 &arg->ca32_getfs.gd32_addr,
2074 (sizeof(struct sockaddr))) ||
2075 __copy_from_user(&karg->ca_getfs.gd_path,
2076 &arg->ca32_getfs.gd32_path,
2077 (NFS_MAXPATHLEN+1)) ||
2078 __get_user(karg->ca_getfs.gd_maxlen,
2079 &arg->ca32_getfs.gd32_maxlen))
2080 return -EFAULT;
2081
2082 return 0;
2083 }
2084
2085 /* This really doesn't need translations, we are only passing
2086 * back a union which contains opaque nfs file handle data.
2087 */
2088 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2089 union compat_nfsctl_res __user *res)
2090 {
2091 int err;
2092
2093 err = copy_to_user(res, kres, sizeof(*res));
2094
2095 return (err) ? -EFAULT : 0;
2096 }
2097
2098 asmlinkage long compat_sys_nfsservctl(int cmd,
2099 struct compat_nfsctl_arg __user *arg,
2100 union compat_nfsctl_res __user *res)
2101 {
2102 struct nfsctl_arg *karg;
2103 union nfsctl_res *kres;
2104 mm_segment_t oldfs;
2105 int err;
2106
2107 karg = kmalloc(sizeof(*karg), GFP_USER);
2108 kres = kmalloc(sizeof(*kres), GFP_USER);
2109 if(!karg || !kres) {
2110 err = -ENOMEM;
2111 goto done;
2112 }
2113
2114 switch(cmd) {
2115 case NFSCTL_SVC:
2116 err = compat_nfs_svc_trans(karg, arg);
2117 break;
2118
2119 case NFSCTL_ADDCLIENT:
2120 err = compat_nfs_clnt_trans(karg, arg);
2121 break;
2122
2123 case NFSCTL_DELCLIENT:
2124 err = compat_nfs_clnt_trans(karg, arg);
2125 break;
2126
2127 case NFSCTL_EXPORT:
2128 case NFSCTL_UNEXPORT:
2129 err = compat_nfs_exp_trans(karg, arg);
2130 break;
2131
2132 case NFSCTL_GETFD:
2133 err = compat_nfs_getfd_trans(karg, arg);
2134 break;
2135
2136 case NFSCTL_GETFS:
2137 err = compat_nfs_getfs_trans(karg, arg);
2138 break;
2139
2140 default:
2141 err = -EINVAL;
2142 break;
2143 }
2144
2145 if (err)
2146 goto done;
2147
2148 oldfs = get_fs();
2149 set_fs(KERNEL_DS);
2150 /* The __user pointer casts are valid because of the set_fs() */
2151 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2152 set_fs(oldfs);
2153
2154 if (err)
2155 goto done;
2156
2157 if((cmd == NFSCTL_GETFD) ||
2158 (cmd == NFSCTL_GETFS))
2159 err = compat_nfs_getfh_res_trans(kres, res);
2160
2161 done:
2162 kfree(karg);
2163 kfree(kres);
2164 return err;
2165 }
2166 #else /* !NFSD */
2167 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2168 {
2169 return sys_ni_syscall();
2170 }
2171 #endif
2172
2173 #ifdef CONFIG_EPOLL
2174
2175 #ifdef HAVE_SET_RESTORE_SIGMASK
2176 asmlinkage long compat_sys_epoll_pwait(int epfd,
2177 struct compat_epoll_event __user *events,
2178 int maxevents, int timeout,
2179 const compat_sigset_t __user *sigmask,
2180 compat_size_t sigsetsize)
2181 {
2182 long err;
2183 compat_sigset_t csigmask;
2184 sigset_t ksigmask, sigsaved;
2185
2186 /*
2187 * If the caller wants a certain signal mask to be set during the wait,
2188 * we apply it here.
2189 */
2190 if (sigmask) {
2191 if (sigsetsize != sizeof(compat_sigset_t))
2192 return -EINVAL;
2193 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2194 return -EFAULT;
2195 sigset_from_compat(&ksigmask, &csigmask);
2196 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2197 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2198 }
2199
2200 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2201
2202 /*
2203 * If we changed the signal mask, we need to restore the original one.
2204 * In case we've got a signal while waiting, we do not restore the
2205 * signal mask yet, and we allow do_signal() to deliver the signal on
2206 * the way back to userspace, before the signal mask is restored.
2207 */
2208 if (sigmask) {
2209 if (err == -EINTR) {
2210 memcpy(&current->saved_sigmask, &sigsaved,
2211 sizeof(sigsaved));
2212 set_restore_sigmask();
2213 } else
2214 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2215 }
2216
2217 return err;
2218 }
2219 #endif /* HAVE_SET_RESTORE_SIGMASK */
2220
2221 #endif /* CONFIG_EPOLL */
2222
2223 #ifdef CONFIG_SIGNALFD
2224
2225 asmlinkage long compat_sys_signalfd4(int ufd,
2226 const compat_sigset_t __user *sigmask,
2227 compat_size_t sigsetsize, int flags)
2228 {
2229 compat_sigset_t ss32;
2230 sigset_t tmp;
2231 sigset_t __user *ksigmask;
2232
2233 if (sigsetsize != sizeof(compat_sigset_t))
2234 return -EINVAL;
2235 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2236 return -EFAULT;
2237 sigset_from_compat(&tmp, &ss32);
2238 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2239 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2240 return -EFAULT;
2241
2242 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2243 }
2244
2245 asmlinkage long compat_sys_signalfd(int ufd,
2246 const compat_sigset_t __user *sigmask,
2247 compat_size_t sigsetsize)
2248 {
2249 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2250 }
2251 #endif /* CONFIG_SIGNALFD */
2252
2253 #ifdef CONFIG_TIMERFD
2254
2255 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2256 const struct compat_itimerspec __user *utmr,
2257 struct compat_itimerspec __user *otmr)
2258 {
2259 int error;
2260 struct itimerspec t;
2261 struct itimerspec __user *ut;
2262
2263 if (get_compat_itimerspec(&t, utmr))
2264 return -EFAULT;
2265 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2266 if (copy_to_user(&ut[0], &t, sizeof(t)))
2267 return -EFAULT;
2268 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2269 if (!error && otmr)
2270 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2271 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2272
2273 return error;
2274 }
2275
2276 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2277 struct compat_itimerspec __user *otmr)
2278 {
2279 int error;
2280 struct itimerspec t;
2281 struct itimerspec __user *ut;
2282
2283 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2284 error = sys_timerfd_gettime(ufd, ut);
2285 if (!error)
2286 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2287 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2288
2289 return error;
2290 }
2291
2292 #endif /* CONFIG_TIMERFD */
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