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eCryptfs: Remove mmap from directory operations
[linux/fpc-iii.git] / fs / compat.c
blob00d90c2e66f0cf531eced73b49c0c5e10a02829e
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
53 #include <asm/uaccess.h>
54 #include <asm/mmu_context.h>
55 #include <asm/ioctls.h>
56 #include "internal.h"
57
58 int compat_log = 1;
59
60 int compat_printk(const char *fmt, ...)
61 {
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70 }
71
72 #include "read_write.h"
73
74 /*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
79 {
80 struct timespec tv[2];
81
82 if (t) {
83 if (get_user(tv[0].tv_sec, &t->actime) ||
84 get_user(tv[1].tv_sec, &t->modtime))
85 return -EFAULT;
86 tv[0].tv_nsec = 0;
87 tv[1].tv_nsec = 0;
88 }
89 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
90 }
91
92 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
93 {
94 struct timespec tv[2];
95
96 if (t) {
97 if (get_compat_timespec(&tv[0], &t[0]) ||
98 get_compat_timespec(&tv[1], &t[1]))
99 return -EFAULT;
100
101 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
102 return 0;
103 }
104 return do_utimes(dfd, filename, t ? tv : NULL, flags);
105 }
106
107 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
108 {
109 struct timespec tv[2];
110
111 if (t) {
112 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
113 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
114 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
115 get_user(tv[1].tv_nsec, &t[1].tv_usec))
116 return -EFAULT;
117 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
118 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
119 return -EINVAL;
120 tv[0].tv_nsec *= 1000;
121 tv[1].tv_nsec *= 1000;
122 }
123 return do_utimes(dfd, filename, t ? tv : NULL, 0);
124 }
125
126 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
127 {
128 return compat_sys_futimesat(AT_FDCWD, filename, t);
129 }
130
131 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
132 {
133 compat_ino_t ino = stat->ino;
134 typeof(ubuf->st_uid) uid = 0;
135 typeof(ubuf->st_gid) gid = 0;
136 int err;
137
138 SET_UID(uid, stat->uid);
139 SET_GID(gid, stat->gid);
140
141 if ((u64) stat->size > MAX_NON_LFS ||
142 !old_valid_dev(stat->dev) ||
143 !old_valid_dev(stat->rdev))
144 return -EOVERFLOW;
145 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
146 return -EOVERFLOW;
147
148 if (clear_user(ubuf, sizeof(*ubuf)))
149 return -EFAULT;
150
151 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
152 err |= __put_user(ino, &ubuf->st_ino);
153 err |= __put_user(stat->mode, &ubuf->st_mode);
154 err |= __put_user(stat->nlink, &ubuf->st_nlink);
155 err |= __put_user(uid, &ubuf->st_uid);
156 err |= __put_user(gid, &ubuf->st_gid);
157 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
158 err |= __put_user(stat->size, &ubuf->st_size);
159 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
160 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
161 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
162 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
163 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
164 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
165 err |= __put_user(stat->blksize, &ubuf->st_blksize);
166 err |= __put_user(stat->blocks, &ubuf->st_blocks);
167 return err;
168 }
169
170 asmlinkage long compat_sys_newstat(char __user * filename,
171 struct compat_stat __user *statbuf)
172 {
173 struct kstat stat;
174 int error;
175
176 error = vfs_stat(filename, &stat);
177 if (error)
178 return error;
179 return cp_compat_stat(&stat, statbuf);
180 }
181
182 asmlinkage long compat_sys_newlstat(char __user * filename,
183 struct compat_stat __user *statbuf)
184 {
185 struct kstat stat;
186 int error;
187
188 error = vfs_lstat(filename, &stat);
189 if (error)
190 return error;
191 return cp_compat_stat(&stat, statbuf);
192 }
193
194 #ifndef __ARCH_WANT_STAT64
195 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
196 struct compat_stat __user *statbuf, int flag)
197 {
198 struct kstat stat;
199 int error;
200
201 error = vfs_fstatat(dfd, filename, &stat, flag);
202 if (error)
203 return error;
204 return cp_compat_stat(&stat, statbuf);
205 }
206 #endif
207
208 asmlinkage long compat_sys_newfstat(unsigned int fd,
209 struct compat_stat __user * statbuf)
210 {
211 struct kstat stat;
212 int error = vfs_fstat(fd, &stat);
213
214 if (!error)
215 error = cp_compat_stat(&stat, statbuf);
216 return error;
217 }
218
219 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
220 {
221
222 if (sizeof ubuf->f_blocks == 4) {
223 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
224 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
225 return -EOVERFLOW;
226 /* f_files and f_ffree may be -1; it's okay
227 * to stuff that into 32 bits */
228 if (kbuf->f_files != 0xffffffffffffffffULL
229 && (kbuf->f_files & 0xffffffff00000000ULL))
230 return -EOVERFLOW;
231 if (kbuf->f_ffree != 0xffffffffffffffffULL
232 && (kbuf->f_ffree & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 }
235 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
236 __put_user(kbuf->f_type, &ubuf->f_type) ||
237 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
238 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
239 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
240 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
241 __put_user(kbuf->f_files, &ubuf->f_files) ||
242 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
243 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
244 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
245 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
246 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
247 __put_user(0, &ubuf->f_spare[0]) ||
248 __put_user(0, &ubuf->f_spare[1]) ||
249 __put_user(0, &ubuf->f_spare[2]) ||
250 __put_user(0, &ubuf->f_spare[3]) ||
251 __put_user(0, &ubuf->f_spare[4]))
252 return -EFAULT;
253 return 0;
254 }
255
256 /*
257 * The following statfs calls are copies of code from fs/open.c and
258 * should be checked against those from time to time
259 */
260 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
261 {
262 struct path path;
263 int error;
264
265 error = user_path(pathname, &path);
266 if (!error) {
267 struct kstatfs tmp;
268 error = vfs_statfs(path.dentry, &tmp);
269 if (!error)
270 error = put_compat_statfs(buf, &tmp);
271 path_put(&path);
272 }
273 return error;
274 }
275
276 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
277 {
278 struct file * file;
279 struct kstatfs tmp;
280 int error;
281
282 error = -EBADF;
283 file = fget(fd);
284 if (!file)
285 goto out;
286 error = vfs_statfs(file->f_path.dentry, &tmp);
287 if (!error)
288 error = put_compat_statfs(buf, &tmp);
289 fput(file);
290 out:
291 return error;
292 }
293
294 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
295 {
296 if (sizeof ubuf->f_blocks == 4) {
297 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
298 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
299 return -EOVERFLOW;
300 /* f_files and f_ffree may be -1; it's okay
301 * to stuff that into 32 bits */
302 if (kbuf->f_files != 0xffffffffffffffffULL
303 && (kbuf->f_files & 0xffffffff00000000ULL))
304 return -EOVERFLOW;
305 if (kbuf->f_ffree != 0xffffffffffffffffULL
306 && (kbuf->f_ffree & 0xffffffff00000000ULL))
307 return -EOVERFLOW;
308 }
309 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
310 __put_user(kbuf->f_type, &ubuf->f_type) ||
311 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
312 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
313 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
314 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
315 __put_user(kbuf->f_files, &ubuf->f_files) ||
316 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
317 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
318 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
319 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
320 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
321 return -EFAULT;
322 return 0;
323 }
324
325 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
326 {
327 struct path path;
328 int error;
329
330 if (sz != sizeof(*buf))
331 return -EINVAL;
332
333 error = user_path(pathname, &path);
334 if (!error) {
335 struct kstatfs tmp;
336 error = vfs_statfs(path.dentry, &tmp);
337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
339 path_put(&path);
340 }
341 return error;
342 }
343
344 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
345 {
346 struct file * file;
347 struct kstatfs tmp;
348 int error;
349
350 if (sz != sizeof(*buf))
351 return -EINVAL;
352
353 error = -EBADF;
354 file = fget(fd);
355 if (!file)
356 goto out;
357 error = vfs_statfs(file->f_path.dentry, &tmp);
358 if (!error)
359 error = put_compat_statfs64(buf, &tmp);
360 fput(file);
361 out:
362 return error;
363 }
364
365 /*
366 * This is a copy of sys_ustat, just dealing with a structure layout.
367 * Given how simple this syscall is that apporach is more maintainable
368 * than the various conversion hacks.
369 */
370 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
371 {
372 struct super_block *sb;
373 struct compat_ustat tmp;
374 struct kstatfs sbuf;
375 int err;
376
377 sb = user_get_super(new_decode_dev(dev));
378 if (!sb)
379 return -EINVAL;
380 err = vfs_statfs(sb->s_root, &sbuf);
381 drop_super(sb);
382 if (err)
383 return err;
384
385 memset(&tmp, 0, sizeof(struct compat_ustat));
386 tmp.f_tfree = sbuf.f_bfree;
387 tmp.f_tinode = sbuf.f_ffree;
388 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
389 return -EFAULT;
390 return 0;
391 }
392
393 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
394 {
395 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
396 __get_user(kfl->l_type, &ufl->l_type) ||
397 __get_user(kfl->l_whence, &ufl->l_whence) ||
398 __get_user(kfl->l_start, &ufl->l_start) ||
399 __get_user(kfl->l_len, &ufl->l_len) ||
400 __get_user(kfl->l_pid, &ufl->l_pid))
401 return -EFAULT;
402 return 0;
403 }
404
405 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
406 {
407 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
408 __put_user(kfl->l_type, &ufl->l_type) ||
409 __put_user(kfl->l_whence, &ufl->l_whence) ||
410 __put_user(kfl->l_start, &ufl->l_start) ||
411 __put_user(kfl->l_len, &ufl->l_len) ||
412 __put_user(kfl->l_pid, &ufl->l_pid))
413 return -EFAULT;
414 return 0;
415 }
416
417 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
418 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
419 {
420 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
421 __get_user(kfl->l_type, &ufl->l_type) ||
422 __get_user(kfl->l_whence, &ufl->l_whence) ||
423 __get_user(kfl->l_start, &ufl->l_start) ||
424 __get_user(kfl->l_len, &ufl->l_len) ||
425 __get_user(kfl->l_pid, &ufl->l_pid))
426 return -EFAULT;
427 return 0;
428 }
429 #endif
430
431 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
432 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
433 {
434 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
435 __put_user(kfl->l_type, &ufl->l_type) ||
436 __put_user(kfl->l_whence, &ufl->l_whence) ||
437 __put_user(kfl->l_start, &ufl->l_start) ||
438 __put_user(kfl->l_len, &ufl->l_len) ||
439 __put_user(kfl->l_pid, &ufl->l_pid))
440 return -EFAULT;
441 return 0;
442 }
443 #endif
444
445 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
446 unsigned long arg)
447 {
448 mm_segment_t old_fs;
449 struct flock f;
450 long ret;
451
452 switch (cmd) {
453 case F_GETLK:
454 case F_SETLK:
455 case F_SETLKW:
456 ret = get_compat_flock(&f, compat_ptr(arg));
457 if (ret != 0)
458 break;
459 old_fs = get_fs();
460 set_fs(KERNEL_DS);
461 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
462 set_fs(old_fs);
463 if (cmd == F_GETLK && ret == 0) {
464 /* GETLK was successful and we need to return the data...
465 * but it needs to fit in the compat structure.
466 * l_start shouldn't be too big, unless the original
467 * start + end is greater than COMPAT_OFF_T_MAX, in which
468 * case the app was asking for trouble, so we return
469 * -EOVERFLOW in that case.
470 * l_len could be too big, in which case we just truncate it,
471 * and only allow the app to see that part of the conflicting
472 * lock that might make sense to it anyway
473 */
474
475 if (f.l_start > COMPAT_OFF_T_MAX)
476 ret = -EOVERFLOW;
477 if (f.l_len > COMPAT_OFF_T_MAX)
478 f.l_len = COMPAT_OFF_T_MAX;
479 if (ret == 0)
480 ret = put_compat_flock(&f, compat_ptr(arg));
481 }
482 break;
483
484 case F_GETLK64:
485 case F_SETLK64:
486 case F_SETLKW64:
487 ret = get_compat_flock64(&f, compat_ptr(arg));
488 if (ret != 0)
489 break;
490 old_fs = get_fs();
491 set_fs(KERNEL_DS);
492 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
493 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
494 (unsigned long)&f);
495 set_fs(old_fs);
496 if (cmd == F_GETLK64 && ret == 0) {
497 /* need to return lock information - see above for commentary */
498 if (f.l_start > COMPAT_LOFF_T_MAX)
499 ret = -EOVERFLOW;
500 if (f.l_len > COMPAT_LOFF_T_MAX)
501 f.l_len = COMPAT_LOFF_T_MAX;
502 if (ret == 0)
503 ret = put_compat_flock64(&f, compat_ptr(arg));
504 }
505 break;
506
507 default:
508 ret = sys_fcntl(fd, cmd, arg);
509 break;
510 }
511 return ret;
512 }
513
514 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
515 unsigned long arg)
516 {
517 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
518 return -EINVAL;
519 return compat_sys_fcntl64(fd, cmd, arg);
520 }
521
522 asmlinkage long
523 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
524 {
525 long ret;
526 aio_context_t ctx64;
527
528 mm_segment_t oldfs = get_fs();
529 if (unlikely(get_user(ctx64, ctx32p)))
530 return -EFAULT;
531
532 set_fs(KERNEL_DS);
533 /* The __user pointer cast is valid because of the set_fs() */
534 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
535 set_fs(oldfs);
536 /* truncating is ok because it's a user address */
537 if (!ret)
538 ret = put_user((u32) ctx64, ctx32p);
539 return ret;
540 }
541
542 asmlinkage long
543 compat_sys_io_getevents(aio_context_t ctx_id,
544 unsigned long min_nr,
545 unsigned long nr,
546 struct io_event __user *events,
547 struct compat_timespec __user *timeout)
548 {
549 long ret;
550 struct timespec t;
551 struct timespec __user *ut = NULL;
552
553 ret = -EFAULT;
554 if (unlikely(!access_ok(VERIFY_WRITE, events,
555 nr * sizeof(struct io_event))))
556 goto out;
557 if (timeout) {
558 if (get_compat_timespec(&t, timeout))
559 goto out;
560
561 ut = compat_alloc_user_space(sizeof(*ut));
562 if (copy_to_user(ut, &t, sizeof(t)) )
563 goto out;
564 }
565 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
566 out:
567 return ret;
568 }
569
570 static inline long
571 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
572 {
573 compat_uptr_t uptr;
574 int i;
575
576 for (i = 0; i < nr; ++i) {
577 if (get_user(uptr, ptr32 + i))
578 return -EFAULT;
579 if (put_user(compat_ptr(uptr), ptr64 + i))
580 return -EFAULT;
581 }
582 return 0;
583 }
584
585 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
586
587 asmlinkage long
588 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
589 {
590 struct iocb __user * __user *iocb64;
591 long ret;
592
593 if (unlikely(nr < 0))
594 return -EINVAL;
595
596 if (nr > MAX_AIO_SUBMITS)
597 nr = MAX_AIO_SUBMITS;
598
599 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
600 ret = copy_iocb(nr, iocb, iocb64);
601 if (!ret)
602 ret = sys_io_submit(ctx_id, nr, iocb64);
603 return ret;
604 }
605
606 struct compat_ncp_mount_data {
607 compat_int_t version;
608 compat_uint_t ncp_fd;
609 __compat_uid_t mounted_uid;
610 compat_pid_t wdog_pid;
611 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
612 compat_uint_t time_out;
613 compat_uint_t retry_count;
614 compat_uint_t flags;
615 __compat_uid_t uid;
616 __compat_gid_t gid;
617 compat_mode_t file_mode;
618 compat_mode_t dir_mode;
619 };
620
621 struct compat_ncp_mount_data_v4 {
622 compat_int_t version;
623 compat_ulong_t flags;
624 compat_ulong_t mounted_uid;
625 compat_long_t wdog_pid;
626 compat_uint_t ncp_fd;
627 compat_uint_t time_out;
628 compat_uint_t retry_count;
629 compat_ulong_t uid;
630 compat_ulong_t gid;
631 compat_ulong_t file_mode;
632 compat_ulong_t dir_mode;
633 };
634
635 static void *do_ncp_super_data_conv(void *raw_data)
636 {
637 int version = *(unsigned int *)raw_data;
638
639 if (version == 3) {
640 struct compat_ncp_mount_data *c_n = raw_data;
641 struct ncp_mount_data *n = raw_data;
642
643 n->dir_mode = c_n->dir_mode;
644 n->file_mode = c_n->file_mode;
645 n->gid = c_n->gid;
646 n->uid = c_n->uid;
647 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
648 n->wdog_pid = c_n->wdog_pid;
649 n->mounted_uid = c_n->mounted_uid;
650 } else if (version == 4) {
651 struct compat_ncp_mount_data_v4 *c_n = raw_data;
652 struct ncp_mount_data_v4 *n = raw_data;
653
654 n->dir_mode = c_n->dir_mode;
655 n->file_mode = c_n->file_mode;
656 n->gid = c_n->gid;
657 n->uid = c_n->uid;
658 n->retry_count = c_n->retry_count;
659 n->time_out = c_n->time_out;
660 n->ncp_fd = c_n->ncp_fd;
661 n->wdog_pid = c_n->wdog_pid;
662 n->mounted_uid = c_n->mounted_uid;
663 n->flags = c_n->flags;
664 } else if (version != 5) {
665 return NULL;
666 }
667
668 return raw_data;
669 }
670
671 struct compat_smb_mount_data {
672 compat_int_t version;
673 __compat_uid_t mounted_uid;
674 __compat_uid_t uid;
675 __compat_gid_t gid;
676 compat_mode_t file_mode;
677 compat_mode_t dir_mode;
678 };
679
680 static void *do_smb_super_data_conv(void *raw_data)
681 {
682 struct smb_mount_data *s = raw_data;
683 struct compat_smb_mount_data *c_s = raw_data;
684
685 if (c_s->version != SMB_MOUNT_OLDVERSION)
686 goto out;
687 s->dir_mode = c_s->dir_mode;
688 s->file_mode = c_s->file_mode;
689 s->gid = c_s->gid;
690 s->uid = c_s->uid;
691 s->mounted_uid = c_s->mounted_uid;
692 out:
693 return raw_data;
694 }
695
696 struct compat_nfs_string {
697 compat_uint_t len;
698 compat_uptr_t data;
699 };
700
701 static inline void compat_nfs_string(struct nfs_string *dst,
702 struct compat_nfs_string *src)
703 {
704 dst->data = compat_ptr(src->data);
705 dst->len = src->len;
706 }
707
708 struct compat_nfs4_mount_data_v1 {
709 compat_int_t version;
710 compat_int_t flags;
711 compat_int_t rsize;
712 compat_int_t wsize;
713 compat_int_t timeo;
714 compat_int_t retrans;
715 compat_int_t acregmin;
716 compat_int_t acregmax;
717 compat_int_t acdirmin;
718 compat_int_t acdirmax;
719 struct compat_nfs_string client_addr;
720 struct compat_nfs_string mnt_path;
721 struct compat_nfs_string hostname;
722 compat_uint_t host_addrlen;
723 compat_uptr_t host_addr;
724 compat_int_t proto;
725 compat_int_t auth_flavourlen;
726 compat_uptr_t auth_flavours;
727 };
728
729 static int do_nfs4_super_data_conv(void *raw_data)
730 {
731 int version = *(compat_uint_t *) raw_data;
732
733 if (version == 1) {
734 struct compat_nfs4_mount_data_v1 *raw = raw_data;
735 struct nfs4_mount_data *real = raw_data;
736
737 /* copy the fields backwards */
738 real->auth_flavours = compat_ptr(raw->auth_flavours);
739 real->auth_flavourlen = raw->auth_flavourlen;
740 real->proto = raw->proto;
741 real->host_addr = compat_ptr(raw->host_addr);
742 real->host_addrlen = raw->host_addrlen;
743 compat_nfs_string(&real->hostname, &raw->hostname);
744 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
745 compat_nfs_string(&real->client_addr, &raw->client_addr);
746 real->acdirmax = raw->acdirmax;
747 real->acdirmin = raw->acdirmin;
748 real->acregmax = raw->acregmax;
749 real->acregmin = raw->acregmin;
750 real->retrans = raw->retrans;
751 real->timeo = raw->timeo;
752 real->wsize = raw->wsize;
753 real->rsize = raw->rsize;
754 real->flags = raw->flags;
755 real->version = raw->version;
756 }
757
758 return 0;
759 }
760
761 #define SMBFS_NAME "smbfs"
762 #define NCPFS_NAME "ncpfs"
763 #define NFS4_NAME "nfs4"
764
765 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
766 char __user * type, unsigned long flags,
767 void __user * data)
768 {
769 char *kernel_type;
770 unsigned long data_page;
771 char *kernel_dev;
772 char *dir_page;
773 int retval;
774
775 retval = copy_mount_string(type, &kernel_type);
776 if (retval < 0)
777 goto out;
778
779 dir_page = getname(dir_name);
780 retval = PTR_ERR(dir_page);
781 if (IS_ERR(dir_page))
782 goto out1;
783
784 retval = copy_mount_string(dev_name, &kernel_dev);
785 if (retval < 0)
786 goto out2;
787
788 retval = copy_mount_options(data, &data_page);
789 if (retval < 0)
790 goto out3;
791
792 retval = -EINVAL;
793
794 if (kernel_type && data_page) {
795 if (!strcmp(kernel_type, SMBFS_NAME)) {
796 do_smb_super_data_conv((void *)data_page);
797 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
798 do_ncp_super_data_conv((void *)data_page);
799 } else if (!strcmp(kernel_type, NFS4_NAME)) {
800 if (do_nfs4_super_data_conv((void *) data_page))
801 goto out4;
802 }
803 }
804
805 retval = do_mount(kernel_dev, dir_page, kernel_type,
806 flags, (void*)data_page);
807
808 out4:
809 free_page(data_page);
810 out3:
811 kfree(kernel_dev);
812 out2:
813 putname(dir_page);
814 out1:
815 kfree(kernel_type);
816 out:
817 return retval;
818 }
819
820 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
821
822 struct compat_old_linux_dirent {
823 compat_ulong_t d_ino;
824 compat_ulong_t d_offset;
825 unsigned short d_namlen;
826 char d_name[1];
827 };
828
829 struct compat_readdir_callback {
830 struct compat_old_linux_dirent __user *dirent;
831 int result;
832 };
833
834 static int compat_fillonedir(void *__buf, const char *name, int namlen,
835 loff_t offset, u64 ino, unsigned int d_type)
836 {
837 struct compat_readdir_callback *buf = __buf;
838 struct compat_old_linux_dirent __user *dirent;
839 compat_ulong_t d_ino;
840
841 if (buf->result)
842 return -EINVAL;
843 d_ino = ino;
844 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
845 buf->result = -EOVERFLOW;
846 return -EOVERFLOW;
847 }
848 buf->result++;
849 dirent = buf->dirent;
850 if (!access_ok(VERIFY_WRITE, dirent,
851 (unsigned long)(dirent->d_name + namlen + 1) -
852 (unsigned long)dirent))
853 goto efault;
854 if ( __put_user(d_ino, &dirent->d_ino) ||
855 __put_user(offset, &dirent->d_offset) ||
856 __put_user(namlen, &dirent->d_namlen) ||
857 __copy_to_user(dirent->d_name, name, namlen) ||
858 __put_user(0, dirent->d_name + namlen))
859 goto efault;
860 return 0;
861 efault:
862 buf->result = -EFAULT;
863 return -EFAULT;
864 }
865
866 asmlinkage long compat_sys_old_readdir(unsigned int fd,
867 struct compat_old_linux_dirent __user *dirent, unsigned int count)
868 {
869 int error;
870 struct file *file;
871 struct compat_readdir_callback buf;
872
873 error = -EBADF;
874 file = fget(fd);
875 if (!file)
876 goto out;
877
878 buf.result = 0;
879 buf.dirent = dirent;
880
881 error = vfs_readdir(file, compat_fillonedir, &buf);
882 if (buf.result)
883 error = buf.result;
884
885 fput(file);
886 out:
887 return error;
888 }
889
890 struct compat_linux_dirent {
891 compat_ulong_t d_ino;
892 compat_ulong_t d_off;
893 unsigned short d_reclen;
894 char d_name[1];
895 };
896
897 struct compat_getdents_callback {
898 struct compat_linux_dirent __user *current_dir;
899 struct compat_linux_dirent __user *previous;
900 int count;
901 int error;
902 };
903
904 static int compat_filldir(void *__buf, const char *name, int namlen,
905 loff_t offset, u64 ino, unsigned int d_type)
906 {
907 struct compat_linux_dirent __user * dirent;
908 struct compat_getdents_callback *buf = __buf;
909 compat_ulong_t d_ino;
910 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
911
912 buf->error = -EINVAL; /* only used if we fail.. */
913 if (reclen > buf->count)
914 return -EINVAL;
915 d_ino = ino;
916 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
917 buf->error = -EOVERFLOW;
918 return -EOVERFLOW;
919 }
920 dirent = buf->previous;
921 if (dirent) {
922 if (__put_user(offset, &dirent->d_off))
923 goto efault;
924 }
925 dirent = buf->current_dir;
926 if (__put_user(d_ino, &dirent->d_ino))
927 goto efault;
928 if (__put_user(reclen, &dirent->d_reclen))
929 goto efault;
930 if (copy_to_user(dirent->d_name, name, namlen))
931 goto efault;
932 if (__put_user(0, dirent->d_name + namlen))
933 goto efault;
934 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
935 goto efault;
936 buf->previous = dirent;
937 dirent = (void __user *)dirent + reclen;
938 buf->current_dir = dirent;
939 buf->count -= reclen;
940 return 0;
941 efault:
942 buf->error = -EFAULT;
943 return -EFAULT;
944 }
945
946 asmlinkage long compat_sys_getdents(unsigned int fd,
947 struct compat_linux_dirent __user *dirent, unsigned int count)
948 {
949 struct file * file;
950 struct compat_linux_dirent __user * lastdirent;
951 struct compat_getdents_callback buf;
952 int error;
953
954 error = -EFAULT;
955 if (!access_ok(VERIFY_WRITE, dirent, count))
956 goto out;
957
958 error = -EBADF;
959 file = fget(fd);
960 if (!file)
961 goto out;
962
963 buf.current_dir = dirent;
964 buf.previous = NULL;
965 buf.count = count;
966 buf.error = 0;
967
968 error = vfs_readdir(file, compat_filldir, &buf);
969 if (error >= 0)
970 error = buf.error;
971 lastdirent = buf.previous;
972 if (lastdirent) {
973 if (put_user(file->f_pos, &lastdirent->d_off))
974 error = -EFAULT;
975 else
976 error = count - buf.count;
977 }
978 fput(file);
979 out:
980 return error;
981 }
982
983 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
984
985 struct compat_getdents_callback64 {
986 struct linux_dirent64 __user *current_dir;
987 struct linux_dirent64 __user *previous;
988 int count;
989 int error;
990 };
991
992 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
993 u64 ino, unsigned int d_type)
994 {
995 struct linux_dirent64 __user *dirent;
996 struct compat_getdents_callback64 *buf = __buf;
997 int jj = NAME_OFFSET(dirent);
998 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
999 u64 off;
1000
1001 buf->error = -EINVAL; /* only used if we fail.. */
1002 if (reclen > buf->count)
1003 return -EINVAL;
1004 dirent = buf->previous;
1005
1006 if (dirent) {
1007 if (__put_user_unaligned(offset, &dirent->d_off))
1008 goto efault;
1009 }
1010 dirent = buf->current_dir;
1011 if (__put_user_unaligned(ino, &dirent->d_ino))
1012 goto efault;
1013 off = 0;
1014 if (__put_user_unaligned(off, &dirent->d_off))
1015 goto efault;
1016 if (__put_user(reclen, &dirent->d_reclen))
1017 goto efault;
1018 if (__put_user(d_type, &dirent->d_type))
1019 goto efault;
1020 if (copy_to_user(dirent->d_name, name, namlen))
1021 goto efault;
1022 if (__put_user(0, dirent->d_name + namlen))
1023 goto efault;
1024 buf->previous = dirent;
1025 dirent = (void __user *)dirent + reclen;
1026 buf->current_dir = dirent;
1027 buf->count -= reclen;
1028 return 0;
1029 efault:
1030 buf->error = -EFAULT;
1031 return -EFAULT;
1032 }
1033
1034 asmlinkage long compat_sys_getdents64(unsigned int fd,
1035 struct linux_dirent64 __user * dirent, unsigned int count)
1036 {
1037 struct file * file;
1038 struct linux_dirent64 __user * lastdirent;
1039 struct compat_getdents_callback64 buf;
1040 int error;
1041
1042 error = -EFAULT;
1043 if (!access_ok(VERIFY_WRITE, dirent, count))
1044 goto out;
1045
1046 error = -EBADF;
1047 file = fget(fd);
1048 if (!file)
1049 goto out;
1050
1051 buf.current_dir = dirent;
1052 buf.previous = NULL;
1053 buf.count = count;
1054 buf.error = 0;
1055
1056 error = vfs_readdir(file, compat_filldir64, &buf);
1057 if (error >= 0)
1058 error = buf.error;
1059 lastdirent = buf.previous;
1060 if (lastdirent) {
1061 typeof(lastdirent->d_off) d_off = file->f_pos;
1062 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1063 error = -EFAULT;
1064 else
1065 error = count - buf.count;
1066 }
1067 fput(file);
1068 out:
1069 return error;
1070 }
1071 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1072
1073 static ssize_t compat_do_readv_writev(int type, struct file *file,
1074 const struct compat_iovec __user *uvector,
1075 unsigned long nr_segs, loff_t *pos)
1076 {
1077 compat_ssize_t tot_len;
1078 struct iovec iovstack[UIO_FASTIOV];
1079 struct iovec *iov=iovstack, *vector;
1080 ssize_t ret;
1081 int seg;
1082 io_fn_t fn;
1083 iov_fn_t fnv;
1084
1085 /*
1086 * SuS says "The readv() function *may* fail if the iovcnt argument
1087 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1088 * traditionally returned zero for zero segments, so...
1089 */
1090 ret = 0;
1091 if (nr_segs == 0)
1092 goto out;
1093
1094 /*
1095 * First get the "struct iovec" from user memory and
1096 * verify all the pointers
1097 */
1098 ret = -EINVAL;
1099 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1100 goto out;
1101 if (!file->f_op)
1102 goto out;
1103 if (nr_segs > UIO_FASTIOV) {
1104 ret = -ENOMEM;
1105 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1106 if (!iov)
1107 goto out;
1108 }
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 /*
1114 * Single unix specification:
1115 * We should -EINVAL if an element length is not >= 0 and fitting an
1116 * ssize_t. The total length is fitting an ssize_t
1117 *
1118 * Be careful here because iov_len is a size_t not an ssize_t
1119 */
1120 tot_len = 0;
1121 vector = iov;
1122 ret = -EINVAL;
1123 for (seg = 0 ; seg < nr_segs; seg++) {
1124 compat_ssize_t tmp = tot_len;
1125 compat_ssize_t len;
1126 compat_uptr_t buf;
1127
1128 if (__get_user(len, &uvector->iov_len) ||
1129 __get_user(buf, &uvector->iov_base)) {
1130 ret = -EFAULT;
1131 goto out;
1132 }
1133 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1134 goto out;
1135 tot_len += len;
1136 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1137 goto out;
1138 vector->iov_base = compat_ptr(buf);
1139 vector->iov_len = (compat_size_t) len;
1140 uvector++;
1141 vector++;
1142 }
1143 if (tot_len == 0) {
1144 ret = 0;
1145 goto out;
1146 }
1147
1148 ret = rw_verify_area(type, file, pos, tot_len);
1149 if (ret < 0)
1150 goto out;
1151
1152 fnv = NULL;
1153 if (type == READ) {
1154 fn = file->f_op->read;
1155 fnv = file->f_op->aio_read;
1156 } else {
1157 fn = (io_fn_t)file->f_op->write;
1158 fnv = file->f_op->aio_write;
1159 }
1160
1161 if (fnv)
1162 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1163 pos, fnv);
1164 else
1165 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1166
1167 out:
1168 if (iov != iovstack)
1169 kfree(iov);
1170 if ((ret + (type == READ)) > 0) {
1171 struct dentry *dentry = file->f_path.dentry;
1172 if (type == READ)
1173 fsnotify_access(dentry);
1174 else
1175 fsnotify_modify(dentry);
1176 }
1177 return ret;
1178 }
1179
1180 static size_t compat_readv(struct file *file,
1181 const struct compat_iovec __user *vec,
1182 unsigned long vlen, loff_t *pos)
1183 {
1184 ssize_t ret = -EBADF;
1185
1186 if (!(file->f_mode & FMODE_READ))
1187 goto out;
1188
1189 ret = -EINVAL;
1190 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1191 goto out;
1192
1193 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1194
1195 out:
1196 if (ret > 0)
1197 add_rchar(current, ret);
1198 inc_syscr(current);
1199 return ret;
1200 }
1201
1202 asmlinkage ssize_t
1203 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1204 unsigned long vlen)
1205 {
1206 struct file *file;
1207 int fput_needed;
1208 ssize_t ret;
1209
1210 file = fget_light(fd, &fput_needed);
1211 if (!file)
1212 return -EBADF;
1213 ret = compat_readv(file, vec, vlen, &file->f_pos);
1214 fput_light(file, fput_needed);
1215 return ret;
1216 }
1217
1218 asmlinkage ssize_t
1219 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1220 unsigned long vlen, u32 pos_low, u32 pos_high)
1221 {
1222 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1223 struct file *file;
1224 int fput_needed;
1225 ssize_t ret;
1226
1227 if (pos < 0)
1228 return -EINVAL;
1229 file = fget_light(fd, &fput_needed);
1230 if (!file)
1231 return -EBADF;
1232 ret = compat_readv(file, vec, vlen, &pos);
1233 fput_light(file, fput_needed);
1234 return ret;
1235 }
1236
1237 static size_t compat_writev(struct file *file,
1238 const struct compat_iovec __user *vec,
1239 unsigned long vlen, loff_t *pos)
1240 {
1241 ssize_t ret = -EBADF;
1242
1243 if (!(file->f_mode & FMODE_WRITE))
1244 goto out;
1245
1246 ret = -EINVAL;
1247 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1248 goto out;
1249
1250 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1251
1252 out:
1253 if (ret > 0)
1254 add_wchar(current, ret);
1255 inc_syscw(current);
1256 return ret;
1257 }
1258
1259 asmlinkage ssize_t
1260 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1261 unsigned long vlen)
1262 {
1263 struct file *file;
1264 int fput_needed;
1265 ssize_t ret;
1266
1267 file = fget_light(fd, &fput_needed);
1268 if (!file)
1269 return -EBADF;
1270 ret = compat_writev(file, vec, vlen, &file->f_pos);
1271 fput_light(file, fput_needed);
1272 return ret;
1273 }
1274
1275 asmlinkage ssize_t
1276 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1277 unsigned long vlen, u32 pos_low, u32 pos_high)
1278 {
1279 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1280 struct file *file;
1281 int fput_needed;
1282 ssize_t ret;
1283
1284 if (pos < 0)
1285 return -EINVAL;
1286 file = fget_light(fd, &fput_needed);
1287 if (!file)
1288 return -EBADF;
1289 ret = compat_writev(file, vec, vlen, &pos);
1290 fput_light(file, fput_needed);
1291 return ret;
1292 }
1293
1294 asmlinkage long
1295 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1296 unsigned int nr_segs, unsigned int flags)
1297 {
1298 unsigned i;
1299 struct iovec __user *iov;
1300 if (nr_segs > UIO_MAXIOV)
1301 return -EINVAL;
1302 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1303 for (i = 0; i < nr_segs; i++) {
1304 struct compat_iovec v;
1305 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1306 get_user(v.iov_len, &iov32[i].iov_len) ||
1307 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1308 put_user(v.iov_len, &iov[i].iov_len))
1309 return -EFAULT;
1310 }
1311 return sys_vmsplice(fd, iov, nr_segs, flags);
1312 }
1313
1314 /*
1315 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1316 * O_LARGEFILE flag.
1317 */
1318 asmlinkage long
1319 compat_sys_open(const char __user *filename, int flags, int mode)
1320 {
1321 return do_sys_open(AT_FDCWD, filename, flags, mode);
1322 }
1323
1324 /*
1325 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1326 * O_LARGEFILE flag.
1327 */
1328 asmlinkage long
1329 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1330 {
1331 return do_sys_open(dfd, filename, flags, mode);
1332 }
1333
1334 /*
1335 * compat_count() counts the number of arguments/envelopes. It is basically
1336 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1337 * and envp pointers.
1338 */
1339 static int compat_count(compat_uptr_t __user *argv, int max)
1340 {
1341 int i = 0;
1342
1343 if (argv != NULL) {
1344 for (;;) {
1345 compat_uptr_t p;
1346
1347 if (get_user(p, argv))
1348 return -EFAULT;
1349 if (!p)
1350 break;
1351 argv++;
1352 if (i++ >= max)
1353 return -E2BIG;
1354 }
1355 }
1356 return i;
1357 }
1358
1359 /*
1360 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1361 * except that it works with 32 bit argv and envp pointers.
1362 */
1363 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1364 struct linux_binprm *bprm)
1365 {
1366 struct page *kmapped_page = NULL;
1367 char *kaddr = NULL;
1368 unsigned long kpos = 0;
1369 int ret;
1370
1371 while (argc-- > 0) {
1372 compat_uptr_t str;
1373 int len;
1374 unsigned long pos;
1375
1376 if (get_user(str, argv+argc) ||
1377 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1378 ret = -EFAULT;
1379 goto out;
1380 }
1381
1382 if (len > MAX_ARG_STRLEN) {
1383 ret = -E2BIG;
1384 goto out;
1385 }
1386
1387 /* We're going to work our way backwords. */
1388 pos = bprm->p;
1389 str += len;
1390 bprm->p -= len;
1391
1392 while (len > 0) {
1393 int offset, bytes_to_copy;
1394
1395 offset = pos % PAGE_SIZE;
1396 if (offset == 0)
1397 offset = PAGE_SIZE;
1398
1399 bytes_to_copy = offset;
1400 if (bytes_to_copy > len)
1401 bytes_to_copy = len;
1402
1403 offset -= bytes_to_copy;
1404 pos -= bytes_to_copy;
1405 str -= bytes_to_copy;
1406 len -= bytes_to_copy;
1407
1408 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1409 struct page *page;
1410
1411 #ifdef CONFIG_STACK_GROWSUP
1412 ret = expand_stack_downwards(bprm->vma, pos);
1413 if (ret < 0) {
1414 /* We've exceed the stack rlimit. */
1415 ret = -E2BIG;
1416 goto out;
1417 }
1418 #endif
1419 ret = get_user_pages(current, bprm->mm, pos,
1420 1, 1, 1, &page, NULL);
1421 if (ret <= 0) {
1422 /* We've exceed the stack rlimit. */
1423 ret = -E2BIG;
1424 goto out;
1425 }
1426
1427 if (kmapped_page) {
1428 flush_kernel_dcache_page(kmapped_page);
1429 kunmap(kmapped_page);
1430 put_page(kmapped_page);
1431 }
1432 kmapped_page = page;
1433 kaddr = kmap(kmapped_page);
1434 kpos = pos & PAGE_MASK;
1435 flush_cache_page(bprm->vma, kpos,
1436 page_to_pfn(kmapped_page));
1437 }
1438 if (copy_from_user(kaddr+offset, compat_ptr(str),
1439 bytes_to_copy)) {
1440 ret = -EFAULT;
1441 goto out;
1442 }
1443 }
1444 }
1445 ret = 0;
1446 out:
1447 if (kmapped_page) {
1448 flush_kernel_dcache_page(kmapped_page);
1449 kunmap(kmapped_page);
1450 put_page(kmapped_page);
1451 }
1452 return ret;
1453 }
1454
1455 /*
1456 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1457 * that it processes 32 bit argv and envp pointers.
1458 */
1459 int compat_do_execve(char * filename,
1460 compat_uptr_t __user *argv,
1461 compat_uptr_t __user *envp,
1462 struct pt_regs * regs)
1463 {
1464 struct linux_binprm *bprm;
1465 struct file *file;
1466 struct files_struct *displaced;
1467 bool clear_in_exec;
1468 int retval;
1469
1470 retval = unshare_files(&displaced);
1471 if (retval)
1472 goto out_ret;
1473
1474 retval = -ENOMEM;
1475 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1476 if (!bprm)
1477 goto out_files;
1478
1479 retval = prepare_bprm_creds(bprm);
1480 if (retval)
1481 goto out_free;
1482
1483 retval = check_unsafe_exec(bprm);
1484 if (retval < 0)
1485 goto out_free;
1486 clear_in_exec = retval;
1487 current->in_execve = 1;
1488
1489 file = open_exec(filename);
1490 retval = PTR_ERR(file);
1491 if (IS_ERR(file))
1492 goto out_unmark;
1493
1494 sched_exec();
1495
1496 bprm->file = file;
1497 bprm->filename = filename;
1498 bprm->interp = filename;
1499
1500 retval = bprm_mm_init(bprm);
1501 if (retval)
1502 goto out_file;
1503
1504 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1505 if ((retval = bprm->argc) < 0)
1506 goto out;
1507
1508 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1509 if ((retval = bprm->envc) < 0)
1510 goto out;
1511
1512 retval = prepare_binprm(bprm);
1513 if (retval < 0)
1514 goto out;
1515
1516 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1517 if (retval < 0)
1518 goto out;
1519
1520 bprm->exec = bprm->p;
1521 retval = compat_copy_strings(bprm->envc, envp, bprm);
1522 if (retval < 0)
1523 goto out;
1524
1525 retval = compat_copy_strings(bprm->argc, argv, bprm);
1526 if (retval < 0)
1527 goto out;
1528
1529 retval = search_binary_handler(bprm, regs);
1530 if (retval < 0)
1531 goto out;
1532
1533 current->stack_start = current->mm->start_stack;
1534
1535 /* execve succeeded */
1536 current->fs->in_exec = 0;
1537 current->in_execve = 0;
1538 acct_update_integrals(current);
1539 free_bprm(bprm);
1540 if (displaced)
1541 put_files_struct(displaced);
1542 return retval;
1543
1544 out:
1545 if (bprm->mm)
1546 mmput(bprm->mm);
1547
1548 out_file:
1549 if (bprm->file) {
1550 allow_write_access(bprm->file);
1551 fput(bprm->file);
1552 }
1553
1554 out_unmark:
1555 if (clear_in_exec)
1556 current->fs->in_exec = 0;
1557 current->in_execve = 0;
1558
1559 out_free:
1560 free_bprm(bprm);
1561
1562 out_files:
1563 if (displaced)
1564 reset_files_struct(displaced);
1565 out_ret:
1566 return retval;
1567 }
1568
1569 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1570
1571 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1572 int timeval, int ret)
1573 {
1574 struct timespec ts;
1575
1576 if (!p)
1577 return ret;
1578
1579 if (current->personality & STICKY_TIMEOUTS)
1580 goto sticky;
1581
1582 /* No update for zero timeout */
1583 if (!end_time->tv_sec && !end_time->tv_nsec)
1584 return ret;
1585
1586 ktime_get_ts(&ts);
1587 ts = timespec_sub(*end_time, ts);
1588 if (ts.tv_sec < 0)
1589 ts.tv_sec = ts.tv_nsec = 0;
1590
1591 if (timeval) {
1592 struct compat_timeval rtv;
1593
1594 rtv.tv_sec = ts.tv_sec;
1595 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1596
1597 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1598 return ret;
1599 } else {
1600 struct compat_timespec rts;
1601
1602 rts.tv_sec = ts.tv_sec;
1603 rts.tv_nsec = ts.tv_nsec;
1604
1605 if (!copy_to_user(p, &rts, sizeof(rts)))
1606 return ret;
1607 }
1608 /*
1609 * If an application puts its timeval in read-only memory, we
1610 * don't want the Linux-specific update to the timeval to
1611 * cause a fault after the select has completed
1612 * successfully. However, because we're not updating the
1613 * timeval, we can't restart the system call.
1614 */
1615
1616 sticky:
1617 if (ret == -ERESTARTNOHAND)
1618 ret = -EINTR;
1619 return ret;
1620 }
1621
1622 /*
1623 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1624 * 64-bit unsigned longs.
1625 */
1626 static
1627 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1628 unsigned long *fdset)
1629 {
1630 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1631 if (ufdset) {
1632 unsigned long odd;
1633
1634 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1635 return -EFAULT;
1636
1637 odd = nr & 1UL;
1638 nr &= ~1UL;
1639 while (nr) {
1640 unsigned long h, l;
1641 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1642 return -EFAULT;
1643 ufdset += 2;
1644 *fdset++ = h << 32 | l;
1645 nr -= 2;
1646 }
1647 if (odd && __get_user(*fdset, ufdset))
1648 return -EFAULT;
1649 } else {
1650 /* Tricky, must clear full unsigned long in the
1651 * kernel fdset at the end, this makes sure that
1652 * actually happens.
1653 */
1654 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1655 }
1656 return 0;
1657 }
1658
1659 static
1660 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1661 unsigned long *fdset)
1662 {
1663 unsigned long odd;
1664 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1665
1666 if (!ufdset)
1667 return 0;
1668
1669 odd = nr & 1UL;
1670 nr &= ~1UL;
1671 while (nr) {
1672 unsigned long h, l;
1673 l = *fdset++;
1674 h = l >> 32;
1675 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1676 return -EFAULT;
1677 ufdset += 2;
1678 nr -= 2;
1679 }
1680 if (odd && __put_user(*fdset, ufdset))
1681 return -EFAULT;
1682 return 0;
1683 }
1684
1685
1686 /*
1687 * This is a virtual copy of sys_select from fs/select.c and probably
1688 * should be compared to it from time to time
1689 */
1690
1691 /*
1692 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1693 * like to be certain this leads to no problems. So I return
1694 * EINTR just for safety.
1695 *
1696 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1697 * I'm trying ERESTARTNOHAND which restart only when you want to.
1698 */
1699 #define MAX_SELECT_SECONDS \
1700 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1701
1702 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1703 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1704 struct timespec *end_time)
1705 {
1706 fd_set_bits fds;
1707 void *bits;
1708 int size, max_fds, ret = -EINVAL;
1709 struct fdtable *fdt;
1710 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1711
1712 if (n < 0)
1713 goto out_nofds;
1714
1715 /* max_fds can increase, so grab it once to avoid race */
1716 rcu_read_lock();
1717 fdt = files_fdtable(current->files);
1718 max_fds = fdt->max_fds;
1719 rcu_read_unlock();
1720 if (n > max_fds)
1721 n = max_fds;
1722
1723 /*
1724 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1725 * since we used fdset we need to allocate memory in units of
1726 * long-words.
1727 */
1728 size = FDS_BYTES(n);
1729 bits = stack_fds;
1730 if (size > sizeof(stack_fds) / 6) {
1731 bits = kmalloc(6 * size, GFP_KERNEL);
1732 ret = -ENOMEM;
1733 if (!bits)
1734 goto out_nofds;
1735 }
1736 fds.in = (unsigned long *) bits;
1737 fds.out = (unsigned long *) (bits + size);
1738 fds.ex = (unsigned long *) (bits + 2*size);
1739 fds.res_in = (unsigned long *) (bits + 3*size);
1740 fds.res_out = (unsigned long *) (bits + 4*size);
1741 fds.res_ex = (unsigned long *) (bits + 5*size);
1742
1743 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1744 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1745 (ret = compat_get_fd_set(n, exp, fds.ex)))
1746 goto out;
1747 zero_fd_set(n, fds.res_in);
1748 zero_fd_set(n, fds.res_out);
1749 zero_fd_set(n, fds.res_ex);
1750
1751 ret = do_select(n, &fds, end_time);
1752
1753 if (ret < 0)
1754 goto out;
1755 if (!ret) {
1756 ret = -ERESTARTNOHAND;
1757 if (signal_pending(current))
1758 goto out;
1759 ret = 0;
1760 }
1761
1762 if (compat_set_fd_set(n, inp, fds.res_in) ||
1763 compat_set_fd_set(n, outp, fds.res_out) ||
1764 compat_set_fd_set(n, exp, fds.res_ex))
1765 ret = -EFAULT;
1766 out:
1767 if (bits != stack_fds)
1768 kfree(bits);
1769 out_nofds:
1770 return ret;
1771 }
1772
1773 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1774 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1775 struct compat_timeval __user *tvp)
1776 {
1777 struct timespec end_time, *to = NULL;
1778 struct compat_timeval tv;
1779 int ret;
1780
1781 if (tvp) {
1782 if (copy_from_user(&tv, tvp, sizeof(tv)))
1783 return -EFAULT;
1784
1785 to = &end_time;
1786 if (poll_select_set_timeout(to,
1787 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1788 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1789 return -EINVAL;
1790 }
1791
1792 ret = compat_core_sys_select(n, inp, outp, exp, to);
1793 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1794
1795 return ret;
1796 }
1797
1798 #ifdef HAVE_SET_RESTORE_SIGMASK
1799 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1800 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1801 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1802 compat_size_t sigsetsize)
1803 {
1804 compat_sigset_t ss32;
1805 sigset_t ksigmask, sigsaved;
1806 struct compat_timespec ts;
1807 struct timespec end_time, *to = NULL;
1808 int ret;
1809
1810 if (tsp) {
1811 if (copy_from_user(&ts, tsp, sizeof(ts)))
1812 return -EFAULT;
1813
1814 to = &end_time;
1815 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1816 return -EINVAL;
1817 }
1818
1819 if (sigmask) {
1820 if (sigsetsize != sizeof(compat_sigset_t))
1821 return -EINVAL;
1822 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1823 return -EFAULT;
1824 sigset_from_compat(&ksigmask, &ss32);
1825
1826 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1827 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1828 }
1829
1830 ret = compat_core_sys_select(n, inp, outp, exp, to);
1831 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1832
1833 if (ret == -ERESTARTNOHAND) {
1834 /*
1835 * Don't restore the signal mask yet. Let do_signal() deliver
1836 * the signal on the way back to userspace, before the signal
1837 * mask is restored.
1838 */
1839 if (sigmask) {
1840 memcpy(&current->saved_sigmask, &sigsaved,
1841 sizeof(sigsaved));
1842 set_restore_sigmask();
1843 }
1844 } else if (sigmask)
1845 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1846
1847 return ret;
1848 }
1849
1850 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1851 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1852 struct compat_timespec __user *tsp, void __user *sig)
1853 {
1854 compat_size_t sigsetsize = 0;
1855 compat_uptr_t up = 0;
1856
1857 if (sig) {
1858 if (!access_ok(VERIFY_READ, sig,
1859 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1860 __get_user(up, (compat_uptr_t __user *)sig) ||
1861 __get_user(sigsetsize,
1862 (compat_size_t __user *)(sig+sizeof(up))))
1863 return -EFAULT;
1864 }
1865 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1866 sigsetsize);
1867 }
1868
1869 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1870 unsigned int nfds, struct compat_timespec __user *tsp,
1871 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1872 {
1873 compat_sigset_t ss32;
1874 sigset_t ksigmask, sigsaved;
1875 struct compat_timespec ts;
1876 struct timespec end_time, *to = NULL;
1877 int ret;
1878
1879 if (tsp) {
1880 if (copy_from_user(&ts, tsp, sizeof(ts)))
1881 return -EFAULT;
1882
1883 to = &end_time;
1884 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1885 return -EINVAL;
1886 }
1887
1888 if (sigmask) {
1889 if (sigsetsize != sizeof(compat_sigset_t))
1890 return -EINVAL;
1891 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1892 return -EFAULT;
1893 sigset_from_compat(&ksigmask, &ss32);
1894
1895 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1896 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1897 }
1898
1899 ret = do_sys_poll(ufds, nfds, to);
1900
1901 /* We can restart this syscall, usually */
1902 if (ret == -EINTR) {
1903 /*
1904 * Don't restore the signal mask yet. Let do_signal() deliver
1905 * the signal on the way back to userspace, before the signal
1906 * mask is restored.
1907 */
1908 if (sigmask) {
1909 memcpy(&current->saved_sigmask, &sigsaved,
1910 sizeof(sigsaved));
1911 set_restore_sigmask();
1912 }
1913 ret = -ERESTARTNOHAND;
1914 } else if (sigmask)
1915 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1916
1917 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1918
1919 return ret;
1920 }
1921 #endif /* HAVE_SET_RESTORE_SIGMASK */
1922
1923 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1924 /* Stuff for NFS server syscalls... */
1925 struct compat_nfsctl_svc {
1926 u16 svc32_port;
1927 s32 svc32_nthreads;
1928 };
1929
1930 struct compat_nfsctl_client {
1931 s8 cl32_ident[NFSCLNT_IDMAX+1];
1932 s32 cl32_naddr;
1933 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1934 s32 cl32_fhkeytype;
1935 s32 cl32_fhkeylen;
1936 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1937 };
1938
1939 struct compat_nfsctl_export {
1940 char ex32_client[NFSCLNT_IDMAX+1];
1941 char ex32_path[NFS_MAXPATHLEN+1];
1942 compat_dev_t ex32_dev;
1943 compat_ino_t ex32_ino;
1944 compat_int_t ex32_flags;
1945 __compat_uid_t ex32_anon_uid;
1946 __compat_gid_t ex32_anon_gid;
1947 };
1948
1949 struct compat_nfsctl_fdparm {
1950 struct sockaddr gd32_addr;
1951 s8 gd32_path[NFS_MAXPATHLEN+1];
1952 compat_int_t gd32_version;
1953 };
1954
1955 struct compat_nfsctl_fsparm {
1956 struct sockaddr gd32_addr;
1957 s8 gd32_path[NFS_MAXPATHLEN+1];
1958 compat_int_t gd32_maxlen;
1959 };
1960
1961 struct compat_nfsctl_arg {
1962 compat_int_t ca32_version; /* safeguard */
1963 union {
1964 struct compat_nfsctl_svc u32_svc;
1965 struct compat_nfsctl_client u32_client;
1966 struct compat_nfsctl_export u32_export;
1967 struct compat_nfsctl_fdparm u32_getfd;
1968 struct compat_nfsctl_fsparm u32_getfs;
1969 } u;
1970 #define ca32_svc u.u32_svc
1971 #define ca32_client u.u32_client
1972 #define ca32_export u.u32_export
1973 #define ca32_getfd u.u32_getfd
1974 #define ca32_getfs u.u32_getfs
1975 };
1976
1977 union compat_nfsctl_res {
1978 __u8 cr32_getfh[NFS_FHSIZE];
1979 struct knfsd_fh cr32_getfs;
1980 };
1981
1982 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1983 struct compat_nfsctl_arg __user *arg)
1984 {
1985 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1986 get_user(karg->ca_version, &arg->ca32_version) ||
1987 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1988 __get_user(karg->ca_svc.svc_nthreads,
1989 &arg->ca32_svc.svc32_nthreads))
1990 return -EFAULT;
1991 return 0;
1992 }
1993
1994 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1995 struct compat_nfsctl_arg __user *arg)
1996 {
1997 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1998 sizeof(arg->ca32_client)) ||
1999 get_user(karg->ca_version, &arg->ca32_version) ||
2000 __copy_from_user(&karg->ca_client.cl_ident[0],
2001 &arg->ca32_client.cl32_ident[0],
2002 NFSCLNT_IDMAX) ||
2003 __get_user(karg->ca_client.cl_naddr,
2004 &arg->ca32_client.cl32_naddr) ||
2005 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2006 &arg->ca32_client.cl32_addrlist[0],
2007 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2008 __get_user(karg->ca_client.cl_fhkeytype,
2009 &arg->ca32_client.cl32_fhkeytype) ||
2010 __get_user(karg->ca_client.cl_fhkeylen,
2011 &arg->ca32_client.cl32_fhkeylen) ||
2012 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2013 &arg->ca32_client.cl32_fhkey[0],
2014 NFSCLNT_KEYMAX))
2015 return -EFAULT;
2016
2017 return 0;
2018 }
2019
2020 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2021 struct compat_nfsctl_arg __user *arg)
2022 {
2023 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2024 sizeof(arg->ca32_export)) ||
2025 get_user(karg->ca_version, &arg->ca32_version) ||
2026 __copy_from_user(&karg->ca_export.ex_client[0],
2027 &arg->ca32_export.ex32_client[0],
2028 NFSCLNT_IDMAX) ||
2029 __copy_from_user(&karg->ca_export.ex_path[0],
2030 &arg->ca32_export.ex32_path[0],
2031 NFS_MAXPATHLEN) ||
2032 __get_user(karg->ca_export.ex_dev,
2033 &arg->ca32_export.ex32_dev) ||
2034 __get_user(karg->ca_export.ex_ino,
2035 &arg->ca32_export.ex32_ino) ||
2036 __get_user(karg->ca_export.ex_flags,
2037 &arg->ca32_export.ex32_flags) ||
2038 __get_user(karg->ca_export.ex_anon_uid,
2039 &arg->ca32_export.ex32_anon_uid) ||
2040 __get_user(karg->ca_export.ex_anon_gid,
2041 &arg->ca32_export.ex32_anon_gid))
2042 return -EFAULT;
2043 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2044 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2045
2046 return 0;
2047 }
2048
2049 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2050 struct compat_nfsctl_arg __user *arg)
2051 {
2052 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2053 sizeof(arg->ca32_getfd)) ||
2054 get_user(karg->ca_version, &arg->ca32_version) ||
2055 __copy_from_user(&karg->ca_getfd.gd_addr,
2056 &arg->ca32_getfd.gd32_addr,
2057 (sizeof(struct sockaddr))) ||
2058 __copy_from_user(&karg->ca_getfd.gd_path,
2059 &arg->ca32_getfd.gd32_path,
2060 (NFS_MAXPATHLEN+1)) ||
2061 __get_user(karg->ca_getfd.gd_version,
2062 &arg->ca32_getfd.gd32_version))
2063 return -EFAULT;
2064
2065 return 0;
2066 }
2067
2068 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2069 struct compat_nfsctl_arg __user *arg)
2070 {
2071 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2072 get_user(karg->ca_version, &arg->ca32_version) ||
2073 __copy_from_user(&karg->ca_getfs.gd_addr,
2074 &arg->ca32_getfs.gd32_addr,
2075 (sizeof(struct sockaddr))) ||
2076 __copy_from_user(&karg->ca_getfs.gd_path,
2077 &arg->ca32_getfs.gd32_path,
2078 (NFS_MAXPATHLEN+1)) ||
2079 __get_user(karg->ca_getfs.gd_maxlen,
2080 &arg->ca32_getfs.gd32_maxlen))
2081 return -EFAULT;
2082
2083 return 0;
2084 }
2085
2086 /* This really doesn't need translations, we are only passing
2087 * back a union which contains opaque nfs file handle data.
2088 */
2089 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2090 union compat_nfsctl_res __user *res)
2091 {
2092 int err;
2093
2094 err = copy_to_user(res, kres, sizeof(*res));
2095
2096 return (err) ? -EFAULT : 0;
2097 }
2098
2099 asmlinkage long compat_sys_nfsservctl(int cmd,
2100 struct compat_nfsctl_arg __user *arg,
2101 union compat_nfsctl_res __user *res)
2102 {
2103 struct nfsctl_arg *karg;
2104 union nfsctl_res *kres;
2105 mm_segment_t oldfs;
2106 int err;
2107
2108 karg = kmalloc(sizeof(*karg), GFP_USER);
2109 kres = kmalloc(sizeof(*kres), GFP_USER);
2110 if(!karg || !kres) {
2111 err = -ENOMEM;
2112 goto done;
2113 }
2114
2115 switch(cmd) {
2116 case NFSCTL_SVC:
2117 err = compat_nfs_svc_trans(karg, arg);
2118 break;
2119
2120 case NFSCTL_ADDCLIENT:
2121 err = compat_nfs_clnt_trans(karg, arg);
2122 break;
2123
2124 case NFSCTL_DELCLIENT:
2125 err = compat_nfs_clnt_trans(karg, arg);
2126 break;
2127
2128 case NFSCTL_EXPORT:
2129 case NFSCTL_UNEXPORT:
2130 err = compat_nfs_exp_trans(karg, arg);
2131 break;
2132
2133 case NFSCTL_GETFD:
2134 err = compat_nfs_getfd_trans(karg, arg);
2135 break;
2136
2137 case NFSCTL_GETFS:
2138 err = compat_nfs_getfs_trans(karg, arg);
2139 break;
2140
2141 default:
2142 err = -EINVAL;
2143 break;
2144 }
2145
2146 if (err)
2147 goto done;
2148
2149 oldfs = get_fs();
2150 set_fs(KERNEL_DS);
2151 /* The __user pointer casts are valid because of the set_fs() */
2152 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2153 set_fs(oldfs);
2154
2155 if (err)
2156 goto done;
2157
2158 if((cmd == NFSCTL_GETFD) ||
2159 (cmd == NFSCTL_GETFS))
2160 err = compat_nfs_getfh_res_trans(kres, res);
2161
2162 done:
2163 kfree(karg);
2164 kfree(kres);
2165 return err;
2166 }
2167 #else /* !NFSD */
2168 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2169 {
2170 return sys_ni_syscall();
2171 }
2172 #endif
2173
2174 #ifdef CONFIG_EPOLL
2175
2176 #ifdef HAVE_SET_RESTORE_SIGMASK
2177 asmlinkage long compat_sys_epoll_pwait(int epfd,
2178 struct compat_epoll_event __user *events,
2179 int maxevents, int timeout,
2180 const compat_sigset_t __user *sigmask,
2181 compat_size_t sigsetsize)
2182 {
2183 long err;
2184 compat_sigset_t csigmask;
2185 sigset_t ksigmask, sigsaved;
2186
2187 /*
2188 * If the caller wants a certain signal mask to be set during the wait,
2189 * we apply it here.
2190 */
2191 if (sigmask) {
2192 if (sigsetsize != sizeof(compat_sigset_t))
2193 return -EINVAL;
2194 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2195 return -EFAULT;
2196 sigset_from_compat(&ksigmask, &csigmask);
2197 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2198 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2199 }
2200
2201 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2202
2203 /*
2204 * If we changed the signal mask, we need to restore the original one.
2205 * In case we've got a signal while waiting, we do not restore the
2206 * signal mask yet, and we allow do_signal() to deliver the signal on
2207 * the way back to userspace, before the signal mask is restored.
2208 */
2209 if (sigmask) {
2210 if (err == -EINTR) {
2211 memcpy(&current->saved_sigmask, &sigsaved,
2212 sizeof(sigsaved));
2213 set_restore_sigmask();
2214 } else
2215 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2216 }
2217
2218 return err;
2219 }
2220 #endif /* HAVE_SET_RESTORE_SIGMASK */
2221
2222 #endif /* CONFIG_EPOLL */
2223
2224 #ifdef CONFIG_SIGNALFD
2225
2226 asmlinkage long compat_sys_signalfd4(int ufd,
2227 const compat_sigset_t __user *sigmask,
2228 compat_size_t sigsetsize, int flags)
2229 {
2230 compat_sigset_t ss32;
2231 sigset_t tmp;
2232 sigset_t __user *ksigmask;
2233
2234 if (sigsetsize != sizeof(compat_sigset_t))
2235 return -EINVAL;
2236 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2237 return -EFAULT;
2238 sigset_from_compat(&tmp, &ss32);
2239 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2240 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2241 return -EFAULT;
2242
2243 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2244 }
2245
2246 asmlinkage long compat_sys_signalfd(int ufd,
2247 const compat_sigset_t __user *sigmask,
2248 compat_size_t sigsetsize)
2249 {
2250 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2251 }
2252 #endif /* CONFIG_SIGNALFD */
2253
2254 #ifdef CONFIG_TIMERFD
2255
2256 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2257 const struct compat_itimerspec __user *utmr,
2258 struct compat_itimerspec __user *otmr)
2259 {
2260 int error;
2261 struct itimerspec t;
2262 struct itimerspec __user *ut;
2263
2264 if (get_compat_itimerspec(&t, utmr))
2265 return -EFAULT;
2266 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2267 if (copy_to_user(&ut[0], &t, sizeof(t)))
2268 return -EFAULT;
2269 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2270 if (!error && otmr)
2271 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2272 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2273
2274 return error;
2275 }
2276
2277 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2278 struct compat_itimerspec __user *otmr)
2279 {
2280 int error;
2281 struct itimerspec t;
2282 struct itimerspec __user *ut;
2283
2284 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2285 error = sys_timerfd_gettime(ufd, ut);
2286 if (!error)
2287 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2288 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2289
2290 return error;
2291 }
2292
2293 #endif /* CONFIG_TIMERFD */
Linux with added FPC-III support