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initial commit with v2.6.32.60
[linux-2.6.32.60-moxart.git] / fs / compat.c
blob46b93d1f4ea59a97e8be0568f7a31d20f7da9bb8
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 struct dentry *dentry = file->f_path.dentry;
1174 if (type == READ)
1175 fsnotify_access(dentry);
1176 else
1177 fsnotify_modify(dentry);
1178 }
1179 return ret;
1180 }
1181
1182 static size_t compat_readv(struct file *file,
1183 const struct compat_iovec __user *vec,
1184 unsigned long vlen, loff_t *pos)
1185 {
1186 ssize_t ret = -EBADF;
1187
1188 if (!(file->f_mode & FMODE_READ))
1189 goto out;
1190
1191 ret = -EINVAL;
1192 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1193 goto out;
1194
1195 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1196
1197 out:
1198 if (ret > 0)
1199 add_rchar(current, ret);
1200 inc_syscr(current);
1201 return ret;
1202 }
1203
1204 asmlinkage ssize_t
1205 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1206 unsigned long vlen)
1207 {
1208 struct file *file;
1209 int fput_needed;
1210 ssize_t ret;
1211 loff_t pos;
1212
1213 file = fget_light(fd, &fput_needed);
1214 if (!file)
1215 return -EBADF;
1216 pos = file->f_pos;
1217 ret = compat_readv(file, vec, vlen, &pos);
1218 file->f_pos = pos;
1219 fput_light(file, fput_needed);
1220 return ret;
1221 }
1222
1223 asmlinkage ssize_t
1224 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1225 unsigned long vlen, u32 pos_low, u32 pos_high)
1226 {
1227 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1228 struct file *file;
1229 int fput_needed;
1230 ssize_t ret;
1231
1232 if (pos < 0)
1233 return -EINVAL;
1234 file = fget_light(fd, &fput_needed);
1235 if (!file)
1236 return -EBADF;
1237 ret = compat_readv(file, vec, vlen, &pos);
1238 fput_light(file, fput_needed);
1239 return ret;
1240 }
1241
1242 static size_t compat_writev(struct file *file,
1243 const struct compat_iovec __user *vec,
1244 unsigned long vlen, loff_t *pos)
1245 {
1246 ssize_t ret = -EBADF;
1247
1248 if (!(file->f_mode & FMODE_WRITE))
1249 goto out;
1250
1251 ret = -EINVAL;
1252 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1253 goto out;
1254
1255 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1256
1257 out:
1258 if (ret > 0)
1259 add_wchar(current, ret);
1260 inc_syscw(current);
1261 return ret;
1262 }
1263
1264 asmlinkage ssize_t
1265 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1266 unsigned long vlen)
1267 {
1268 struct file *file;
1269 int fput_needed;
1270 ssize_t ret;
1271 loff_t pos;
1272
1273 file = fget_light(fd, &fput_needed);
1274 if (!file)
1275 return -EBADF;
1276 pos = file->f_pos;
1277 ret = compat_writev(file, vec, vlen, &pos);
1278 file->f_pos = pos;
1279 fput_light(file, fput_needed);
1280 return ret;
1281 }
1282
1283 asmlinkage ssize_t
1284 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1285 unsigned long vlen, u32 pos_low, u32 pos_high)
1286 {
1287 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1288 struct file *file;
1289 int fput_needed;
1290 ssize_t ret;
1291
1292 if (pos < 0)
1293 return -EINVAL;
1294 file = fget_light(fd, &fput_needed);
1295 if (!file)
1296 return -EBADF;
1297 ret = compat_writev(file, vec, vlen, &pos);
1298 fput_light(file, fput_needed);
1299 return ret;
1300 }
1301
1302 asmlinkage long
1303 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1304 unsigned int nr_segs, unsigned int flags)
1305 {
1306 unsigned i;
1307 struct iovec __user *iov;
1308 if (nr_segs > UIO_MAXIOV)
1309 return -EINVAL;
1310 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1311 for (i = 0; i < nr_segs; i++) {
1312 struct compat_iovec v;
1313 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1314 get_user(v.iov_len, &iov32[i].iov_len) ||
1315 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1316 put_user(v.iov_len, &iov[i].iov_len))
1317 return -EFAULT;
1318 }
1319 return sys_vmsplice(fd, iov, nr_segs, flags);
1320 }
1321
1322 /*
1323 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1324 * O_LARGEFILE flag.
1325 */
1326 asmlinkage long
1327 compat_sys_open(const char __user *filename, int flags, int mode)
1328 {
1329 return do_sys_open(AT_FDCWD, filename, flags, mode);
1330 }
1331
1332 /*
1333 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1334 * O_LARGEFILE flag.
1335 */
1336 asmlinkage long
1337 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1338 {
1339 return do_sys_open(dfd, filename, flags, mode);
1340 }
1341
1342 /*
1343 * compat_count() counts the number of arguments/envelopes. It is basically
1344 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1345 * and envp pointers.
1346 */
1347 static int compat_count(compat_uptr_t __user *argv, int max)
1348 {
1349 int i = 0;
1350
1351 if (argv != NULL) {
1352 for (;;) {
1353 compat_uptr_t p;
1354
1355 if (get_user(p, argv))
1356 return -EFAULT;
1357 if (!p)
1358 break;
1359 argv++;
1360 if (i++ >= max)
1361 return -E2BIG;
1362
1363 if (fatal_signal_pending(current))
1364 return -ERESTARTNOHAND;
1365 cond_resched();
1366 }
1367 }
1368 return i;
1369 }
1370
1371 /*
1372 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1373 * except that it works with 32 bit argv and envp pointers.
1374 */
1375 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1376 struct linux_binprm *bprm)
1377 {
1378 struct page *kmapped_page = NULL;
1379 char *kaddr = NULL;
1380 unsigned long kpos = 0;
1381 int ret;
1382
1383 while (argc-- > 0) {
1384 compat_uptr_t str;
1385 int len;
1386 unsigned long pos;
1387
1388 if (get_user(str, argv+argc) ||
1389 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1390 ret = -EFAULT;
1391 goto out;
1392 }
1393
1394 if (len > MAX_ARG_STRLEN) {
1395 ret = -E2BIG;
1396 goto out;
1397 }
1398
1399 /* We're going to work our way backwords. */
1400 pos = bprm->p;
1401 str += len;
1402 bprm->p -= len;
1403
1404 while (len > 0) {
1405 int offset, bytes_to_copy;
1406
1407 if (fatal_signal_pending(current)) {
1408 ret = -ERESTARTNOHAND;
1409 goto out;
1410 }
1411 cond_resched();
1412
1413 offset = pos % PAGE_SIZE;
1414 if (offset == 0)
1415 offset = PAGE_SIZE;
1416
1417 bytes_to_copy = offset;
1418 if (bytes_to_copy > len)
1419 bytes_to_copy = len;
1420
1421 offset -= bytes_to_copy;
1422 pos -= bytes_to_copy;
1423 str -= bytes_to_copy;
1424 len -= bytes_to_copy;
1425
1426 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1427 struct page *page;
1428
1429 page = get_arg_page(bprm, pos, 1);
1430 if (!page) {
1431 ret = -E2BIG;
1432 goto out;
1433 }
1434
1435 if (kmapped_page) {
1436 flush_kernel_dcache_page(kmapped_page);
1437 kunmap(kmapped_page);
1438 put_page(kmapped_page);
1439 }
1440 kmapped_page = page;
1441 kaddr = kmap(kmapped_page);
1442 kpos = pos & PAGE_MASK;
1443 flush_cache_page(bprm->vma, kpos,
1444 page_to_pfn(kmapped_page));
1445 }
1446 if (copy_from_user(kaddr+offset, compat_ptr(str),
1447 bytes_to_copy)) {
1448 ret = -EFAULT;
1449 goto out;
1450 }
1451 }
1452 }
1453 ret = 0;
1454 out:
1455 if (kmapped_page) {
1456 flush_kernel_dcache_page(kmapped_page);
1457 kunmap(kmapped_page);
1458 put_page(kmapped_page);
1459 }
1460 return ret;
1461 }
1462
1463 /*
1464 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1465 * that it processes 32 bit argv and envp pointers.
1466 */
1467 int compat_do_execve(char * filename,
1468 compat_uptr_t __user *argv,
1469 compat_uptr_t __user *envp,
1470 struct pt_regs * regs)
1471 {
1472 struct linux_binprm *bprm;
1473 struct file *file;
1474 struct files_struct *displaced;
1475 bool clear_in_exec;
1476 int retval;
1477
1478 retval = unshare_files(&displaced);
1479 if (retval)
1480 goto out_ret;
1481
1482 retval = -ENOMEM;
1483 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1484 if (!bprm)
1485 goto out_files;
1486
1487 retval = prepare_bprm_creds(bprm);
1488 if (retval)
1489 goto out_free;
1490
1491 retval = check_unsafe_exec(bprm);
1492 if (retval < 0)
1493 goto out_free;
1494 clear_in_exec = retval;
1495 current->in_execve = 1;
1496
1497 file = open_exec(filename);
1498 retval = PTR_ERR(file);
1499 if (IS_ERR(file))
1500 goto out_unmark;
1501
1502 sched_exec();
1503
1504 bprm->file = file;
1505 bprm->filename = filename;
1506 bprm->interp = filename;
1507
1508 retval = bprm_mm_init(bprm);
1509 if (retval)
1510 goto out_file;
1511
1512 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1513 if ((retval = bprm->argc) < 0)
1514 goto out;
1515
1516 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1517 if ((retval = bprm->envc) < 0)
1518 goto out;
1519
1520 retval = prepare_binprm(bprm);
1521 if (retval < 0)
1522 goto out;
1523
1524 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1525 if (retval < 0)
1526 goto out;
1527
1528 bprm->exec = bprm->p;
1529 retval = compat_copy_strings(bprm->envc, envp, bprm);
1530 if (retval < 0)
1531 goto out;
1532
1533 retval = compat_copy_strings(bprm->argc, argv, bprm);
1534 if (retval < 0)
1535 goto out;
1536
1537 retval = search_binary_handler(bprm, regs);
1538 if (retval < 0)
1539 goto out;
1540
1541 /* execve succeeded */
1542 current->fs->in_exec = 0;
1543 current->in_execve = 0;
1544 acct_update_integrals(current);
1545 free_bprm(bprm);
1546 if (displaced)
1547 put_files_struct(displaced);
1548 return retval;
1549
1550 out:
1551 if (bprm->mm) {
1552 acct_arg_size(bprm, 0);
1553 mmput(bprm->mm);
1554 }
1555
1556 out_file:
1557 if (bprm->file) {
1558 allow_write_access(bprm->file);
1559 fput(bprm->file);
1560 }
1561
1562 out_unmark:
1563 if (clear_in_exec)
1564 current->fs->in_exec = 0;
1565 current->in_execve = 0;
1566
1567 out_free:
1568 free_bprm(bprm);
1569
1570 out_files:
1571 if (displaced)
1572 reset_files_struct(displaced);
1573 out_ret:
1574 return retval;
1575 }
1576
1577 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1578
1579 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1580 int timeval, int ret)
1581 {
1582 struct timespec ts;
1583
1584 if (!p)
1585 return ret;
1586
1587 if (current->personality & STICKY_TIMEOUTS)
1588 goto sticky;
1589
1590 /* No update for zero timeout */
1591 if (!end_time->tv_sec && !end_time->tv_nsec)
1592 return ret;
1593
1594 ktime_get_ts(&ts);
1595 ts = timespec_sub(*end_time, ts);
1596 if (ts.tv_sec < 0)
1597 ts.tv_sec = ts.tv_nsec = 0;
1598
1599 if (timeval) {
1600 struct compat_timeval rtv;
1601
1602 rtv.tv_sec = ts.tv_sec;
1603 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1604
1605 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1606 return ret;
1607 } else {
1608 struct compat_timespec rts;
1609
1610 rts.tv_sec = ts.tv_sec;
1611 rts.tv_nsec = ts.tv_nsec;
1612
1613 if (!copy_to_user(p, &rts, sizeof(rts)))
1614 return ret;
1615 }
1616 /*
1617 * If an application puts its timeval in read-only memory, we
1618 * don't want the Linux-specific update to the timeval to
1619 * cause a fault after the select has completed
1620 * successfully. However, because we're not updating the
1621 * timeval, we can't restart the system call.
1622 */
1623
1624 sticky:
1625 if (ret == -ERESTARTNOHAND)
1626 ret = -EINTR;
1627 return ret;
1628 }
1629
1630 /*
1631 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1632 * 64-bit unsigned longs.
1633 */
1634 static
1635 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1636 unsigned long *fdset)
1637 {
1638 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1639 if (ufdset) {
1640 unsigned long odd;
1641
1642 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1643 return -EFAULT;
1644
1645 odd = nr & 1UL;
1646 nr &= ~1UL;
1647 while (nr) {
1648 unsigned long h, l;
1649 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1650 return -EFAULT;
1651 ufdset += 2;
1652 *fdset++ = h << 32 | l;
1653 nr -= 2;
1654 }
1655 if (odd && __get_user(*fdset, ufdset))
1656 return -EFAULT;
1657 } else {
1658 /* Tricky, must clear full unsigned long in the
1659 * kernel fdset at the end, this makes sure that
1660 * actually happens.
1661 */
1662 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1663 }
1664 return 0;
1665 }
1666
1667 static
1668 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1669 unsigned long *fdset)
1670 {
1671 unsigned long odd;
1672 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1673
1674 if (!ufdset)
1675 return 0;
1676
1677 odd = nr & 1UL;
1678 nr &= ~1UL;
1679 while (nr) {
1680 unsigned long h, l;
1681 l = *fdset++;
1682 h = l >> 32;
1683 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1684 return -EFAULT;
1685 ufdset += 2;
1686 nr -= 2;
1687 }
1688 if (odd && __put_user(*fdset, ufdset))
1689 return -EFAULT;
1690 return 0;
1691 }
1692
1693
1694 /*
1695 * This is a virtual copy of sys_select from fs/select.c and probably
1696 * should be compared to it from time to time
1697 */
1698
1699 /*
1700 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1701 * like to be certain this leads to no problems. So I return
1702 * EINTR just for safety.
1703 *
1704 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1705 * I'm trying ERESTARTNOHAND which restart only when you want to.
1706 */
1707 #define MAX_SELECT_SECONDS \
1708 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1709
1710 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1711 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1712 struct timespec *end_time)
1713 {
1714 fd_set_bits fds;
1715 void *bits;
1716 int size, max_fds, ret = -EINVAL;
1717 struct fdtable *fdt;
1718 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1719
1720 if (n < 0)
1721 goto out_nofds;
1722
1723 /* max_fds can increase, so grab it once to avoid race */
1724 rcu_read_lock();
1725 fdt = files_fdtable(current->files);
1726 max_fds = fdt->max_fds;
1727 rcu_read_unlock();
1728 if (n > max_fds)
1729 n = max_fds;
1730
1731 /*
1732 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1733 * since we used fdset we need to allocate memory in units of
1734 * long-words.
1735 */
1736 size = FDS_BYTES(n);
1737 bits = stack_fds;
1738 if (size > sizeof(stack_fds) / 6) {
1739 bits = kmalloc(6 * size, GFP_KERNEL);
1740 ret = -ENOMEM;
1741 if (!bits)
1742 goto out_nofds;
1743 }
1744 fds.in = (unsigned long *) bits;
1745 fds.out = (unsigned long *) (bits + size);
1746 fds.ex = (unsigned long *) (bits + 2*size);
1747 fds.res_in = (unsigned long *) (bits + 3*size);
1748 fds.res_out = (unsigned long *) (bits + 4*size);
1749 fds.res_ex = (unsigned long *) (bits + 5*size);
1750
1751 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1752 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1753 (ret = compat_get_fd_set(n, exp, fds.ex)))
1754 goto out;
1755 zero_fd_set(n, fds.res_in);
1756 zero_fd_set(n, fds.res_out);
1757 zero_fd_set(n, fds.res_ex);
1758
1759 ret = do_select(n, &fds, end_time);
1760
1761 if (ret < 0)
1762 goto out;
1763 if (!ret) {
1764 ret = -ERESTARTNOHAND;
1765 if (signal_pending(current))
1766 goto out;
1767 ret = 0;
1768 }
1769
1770 if (compat_set_fd_set(n, inp, fds.res_in) ||
1771 compat_set_fd_set(n, outp, fds.res_out) ||
1772 compat_set_fd_set(n, exp, fds.res_ex))
1773 ret = -EFAULT;
1774 out:
1775 if (bits != stack_fds)
1776 kfree(bits);
1777 out_nofds:
1778 return ret;
1779 }
1780
1781 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1782 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1783 struct compat_timeval __user *tvp)
1784 {
1785 struct timespec end_time, *to = NULL;
1786 struct compat_timeval tv;
1787 int ret;
1788
1789 if (tvp) {
1790 if (copy_from_user(&tv, tvp, sizeof(tv)))
1791 return -EFAULT;
1792
1793 to = &end_time;
1794 if (poll_select_set_timeout(to,
1795 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1796 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1797 return -EINVAL;
1798 }
1799
1800 ret = compat_core_sys_select(n, inp, outp, exp, to);
1801 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1802
1803 return ret;
1804 }
1805
1806 #ifdef HAVE_SET_RESTORE_SIGMASK
1807 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1808 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1809 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1810 compat_size_t sigsetsize)
1811 {
1812 compat_sigset_t ss32;
1813 sigset_t ksigmask, sigsaved;
1814 struct compat_timespec ts;
1815 struct timespec end_time, *to = NULL;
1816 int ret;
1817
1818 if (tsp) {
1819 if (copy_from_user(&ts, tsp, sizeof(ts)))
1820 return -EFAULT;
1821
1822 to = &end_time;
1823 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1824 return -EINVAL;
1825 }
1826
1827 if (sigmask) {
1828 if (sigsetsize != sizeof(compat_sigset_t))
1829 return -EINVAL;
1830 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1831 return -EFAULT;
1832 sigset_from_compat(&ksigmask, &ss32);
1833
1834 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1835 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1836 }
1837
1838 ret = compat_core_sys_select(n, inp, outp, exp, to);
1839 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1840
1841 if (ret == -ERESTARTNOHAND) {
1842 /*
1843 * Don't restore the signal mask yet. Let do_signal() deliver
1844 * the signal on the way back to userspace, before the signal
1845 * mask is restored.
1846 */
1847 if (sigmask) {
1848 memcpy(&current->saved_sigmask, &sigsaved,
1849 sizeof(sigsaved));
1850 set_restore_sigmask();
1851 }
1852 } else if (sigmask)
1853 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1854
1855 return ret;
1856 }
1857
1858 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1859 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1860 struct compat_timespec __user *tsp, void __user *sig)
1861 {
1862 compat_size_t sigsetsize = 0;
1863 compat_uptr_t up = 0;
1864
1865 if (sig) {
1866 if (!access_ok(VERIFY_READ, sig,
1867 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1868 __get_user(up, (compat_uptr_t __user *)sig) ||
1869 __get_user(sigsetsize,
1870 (compat_size_t __user *)(sig+sizeof(up))))
1871 return -EFAULT;
1872 }
1873 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1874 sigsetsize);
1875 }
1876
1877 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1878 unsigned int nfds, struct compat_timespec __user *tsp,
1879 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1880 {
1881 compat_sigset_t ss32;
1882 sigset_t ksigmask, sigsaved;
1883 struct compat_timespec ts;
1884 struct timespec end_time, *to = NULL;
1885 int ret;
1886
1887 if (tsp) {
1888 if (copy_from_user(&ts, tsp, sizeof(ts)))
1889 return -EFAULT;
1890
1891 to = &end_time;
1892 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1893 return -EINVAL;
1894 }
1895
1896 if (sigmask) {
1897 if (sigsetsize != sizeof(compat_sigset_t))
1898 return -EINVAL;
1899 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1900 return -EFAULT;
1901 sigset_from_compat(&ksigmask, &ss32);
1902
1903 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1904 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1905 }
1906
1907 ret = do_sys_poll(ufds, nfds, to);
1908
1909 /* We can restart this syscall, usually */
1910 if (ret == -EINTR) {
1911 /*
1912 * Don't restore the signal mask yet. Let do_signal() deliver
1913 * the signal on the way back to userspace, before the signal
1914 * mask is restored.
1915 */
1916 if (sigmask) {
1917 memcpy(&current->saved_sigmask, &sigsaved,
1918 sizeof(sigsaved));
1919 set_restore_sigmask();
1920 }
1921 ret = -ERESTARTNOHAND;
1922 } else if (sigmask)
1923 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1924
1925 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1926
1927 return ret;
1928 }
1929 #endif /* HAVE_SET_RESTORE_SIGMASK */
1930
1931 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1932 /* Stuff for NFS server syscalls... */
1933 struct compat_nfsctl_svc {
1934 u16 svc32_port;
1935 s32 svc32_nthreads;
1936 };
1937
1938 struct compat_nfsctl_client {
1939 s8 cl32_ident[NFSCLNT_IDMAX+1];
1940 s32 cl32_naddr;
1941 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1942 s32 cl32_fhkeytype;
1943 s32 cl32_fhkeylen;
1944 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1945 };
1946
1947 struct compat_nfsctl_export {
1948 char ex32_client[NFSCLNT_IDMAX+1];
1949 char ex32_path[NFS_MAXPATHLEN+1];
1950 compat_dev_t ex32_dev;
1951 compat_ino_t ex32_ino;
1952 compat_int_t ex32_flags;
1953 __compat_uid_t ex32_anon_uid;
1954 __compat_gid_t ex32_anon_gid;
1955 };
1956
1957 struct compat_nfsctl_fdparm {
1958 struct sockaddr gd32_addr;
1959 s8 gd32_path[NFS_MAXPATHLEN+1];
1960 compat_int_t gd32_version;
1961 };
1962
1963 struct compat_nfsctl_fsparm {
1964 struct sockaddr gd32_addr;
1965 s8 gd32_path[NFS_MAXPATHLEN+1];
1966 compat_int_t gd32_maxlen;
1967 };
1968
1969 struct compat_nfsctl_arg {
1970 compat_int_t ca32_version; /* safeguard */
1971 union {
1972 struct compat_nfsctl_svc u32_svc;
1973 struct compat_nfsctl_client u32_client;
1974 struct compat_nfsctl_export u32_export;
1975 struct compat_nfsctl_fdparm u32_getfd;
1976 struct compat_nfsctl_fsparm u32_getfs;
1977 } u;
1978 #define ca32_svc u.u32_svc
1979 #define ca32_client u.u32_client
1980 #define ca32_export u.u32_export
1981 #define ca32_getfd u.u32_getfd
1982 #define ca32_getfs u.u32_getfs
1983 };
1984
1985 union compat_nfsctl_res {
1986 __u8 cr32_getfh[NFS_FHSIZE];
1987 struct knfsd_fh cr32_getfs;
1988 };
1989
1990 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1991 struct compat_nfsctl_arg __user *arg)
1992 {
1993 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1994 get_user(karg->ca_version, &arg->ca32_version) ||
1995 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1996 __get_user(karg->ca_svc.svc_nthreads,
1997 &arg->ca32_svc.svc32_nthreads))
1998 return -EFAULT;
1999 return 0;
2000 }
2001
2002 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2003 struct compat_nfsctl_arg __user *arg)
2004 {
2005 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2006 sizeof(arg->ca32_client)) ||
2007 get_user(karg->ca_version, &arg->ca32_version) ||
2008 __copy_from_user(&karg->ca_client.cl_ident[0],
2009 &arg->ca32_client.cl32_ident[0],
2010 NFSCLNT_IDMAX) ||
2011 __get_user(karg->ca_client.cl_naddr,
2012 &arg->ca32_client.cl32_naddr) ||
2013 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2014 &arg->ca32_client.cl32_addrlist[0],
2015 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2016 __get_user(karg->ca_client.cl_fhkeytype,
2017 &arg->ca32_client.cl32_fhkeytype) ||
2018 __get_user(karg->ca_client.cl_fhkeylen,
2019 &arg->ca32_client.cl32_fhkeylen) ||
2020 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2021 &arg->ca32_client.cl32_fhkey[0],
2022 NFSCLNT_KEYMAX))
2023 return -EFAULT;
2024
2025 return 0;
2026 }
2027
2028 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2029 struct compat_nfsctl_arg __user *arg)
2030 {
2031 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2032 sizeof(arg->ca32_export)) ||
2033 get_user(karg->ca_version, &arg->ca32_version) ||
2034 __copy_from_user(&karg->ca_export.ex_client[0],
2035 &arg->ca32_export.ex32_client[0],
2036 NFSCLNT_IDMAX) ||
2037 __copy_from_user(&karg->ca_export.ex_path[0],
2038 &arg->ca32_export.ex32_path[0],
2039 NFS_MAXPATHLEN) ||
2040 __get_user(karg->ca_export.ex_dev,
2041 &arg->ca32_export.ex32_dev) ||
2042 __get_user(karg->ca_export.ex_ino,
2043 &arg->ca32_export.ex32_ino) ||
2044 __get_user(karg->ca_export.ex_flags,
2045 &arg->ca32_export.ex32_flags) ||
2046 __get_user(karg->ca_export.ex_anon_uid,
2047 &arg->ca32_export.ex32_anon_uid) ||
2048 __get_user(karg->ca_export.ex_anon_gid,
2049 &arg->ca32_export.ex32_anon_gid))
2050 return -EFAULT;
2051 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2052 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2053
2054 return 0;
2055 }
2056
2057 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2058 struct compat_nfsctl_arg __user *arg)
2059 {
2060 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2061 sizeof(arg->ca32_getfd)) ||
2062 get_user(karg->ca_version, &arg->ca32_version) ||
2063 __copy_from_user(&karg->ca_getfd.gd_addr,
2064 &arg->ca32_getfd.gd32_addr,
2065 (sizeof(struct sockaddr))) ||
2066 __copy_from_user(&karg->ca_getfd.gd_path,
2067 &arg->ca32_getfd.gd32_path,
2068 (NFS_MAXPATHLEN+1)) ||
2069 __get_user(karg->ca_getfd.gd_version,
2070 &arg->ca32_getfd.gd32_version))
2071 return -EFAULT;
2072
2073 return 0;
2074 }
2075
2076 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2077 struct compat_nfsctl_arg __user *arg)
2078 {
2079 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2080 get_user(karg->ca_version, &arg->ca32_version) ||
2081 __copy_from_user(&karg->ca_getfs.gd_addr,
2082 &arg->ca32_getfs.gd32_addr,
2083 (sizeof(struct sockaddr))) ||
2084 __copy_from_user(&karg->ca_getfs.gd_path,
2085 &arg->ca32_getfs.gd32_path,
2086 (NFS_MAXPATHLEN+1)) ||
2087 __get_user(karg->ca_getfs.gd_maxlen,
2088 &arg->ca32_getfs.gd32_maxlen))
2089 return -EFAULT;
2090
2091 return 0;
2092 }
2093
2094 /* This really doesn't need translations, we are only passing
2095 * back a union which contains opaque nfs file handle data.
2096 */
2097 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2098 union compat_nfsctl_res __user *res)
2099 {
2100 int err;
2101
2102 err = copy_to_user(res, kres, sizeof(*res));
2103
2104 return (err) ? -EFAULT : 0;
2105 }
2106
2107 asmlinkage long compat_sys_nfsservctl(int cmd,
2108 struct compat_nfsctl_arg __user *arg,
2109 union compat_nfsctl_res __user *res)
2110 {
2111 struct nfsctl_arg *karg;
2112 union nfsctl_res *kres;
2113 mm_segment_t oldfs;
2114 int err;
2115
2116 karg = kmalloc(sizeof(*karg), GFP_USER);
2117 kres = kmalloc(sizeof(*kres), GFP_USER);
2118 if(!karg || !kres) {
2119 err = -ENOMEM;
2120 goto done;
2121 }
2122
2123 switch(cmd) {
2124 case NFSCTL_SVC:
2125 err = compat_nfs_svc_trans(karg, arg);
2126 break;
2127
2128 case NFSCTL_ADDCLIENT:
2129 err = compat_nfs_clnt_trans(karg, arg);
2130 break;
2131
2132 case NFSCTL_DELCLIENT:
2133 err = compat_nfs_clnt_trans(karg, arg);
2134 break;
2135
2136 case NFSCTL_EXPORT:
2137 case NFSCTL_UNEXPORT:
2138 err = compat_nfs_exp_trans(karg, arg);
2139 break;
2140
2141 case NFSCTL_GETFD:
2142 err = compat_nfs_getfd_trans(karg, arg);
2143 break;
2144
2145 case NFSCTL_GETFS:
2146 err = compat_nfs_getfs_trans(karg, arg);
2147 break;
2148
2149 default:
2150 err = -EINVAL;
2151 break;
2152 }
2153
2154 if (err)
2155 goto done;
2156
2157 oldfs = get_fs();
2158 set_fs(KERNEL_DS);
2159 /* The __user pointer casts are valid because of the set_fs() */
2160 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2161 set_fs(oldfs);
2162
2163 if (err)
2164 goto done;
2165
2166 if((cmd == NFSCTL_GETFD) ||
2167 (cmd == NFSCTL_GETFS))
2168 err = compat_nfs_getfh_res_trans(kres, res);
2169
2170 done:
2171 kfree(karg);
2172 kfree(kres);
2173 return err;
2174 }
2175 #else /* !NFSD */
2176 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2177 {
2178 return sys_ni_syscall();
2179 }
2180 #endif
2181
2182 #ifdef CONFIG_EPOLL
2183
2184 #ifdef HAVE_SET_RESTORE_SIGMASK
2185 asmlinkage long compat_sys_epoll_pwait(int epfd,
2186 struct compat_epoll_event __user *events,
2187 int maxevents, int timeout,
2188 const compat_sigset_t __user *sigmask,
2189 compat_size_t sigsetsize)
2190 {
2191 long err;
2192 compat_sigset_t csigmask;
2193 sigset_t ksigmask, sigsaved;
2194
2195 /*
2196 * If the caller wants a certain signal mask to be set during the wait,
2197 * we apply it here.
2198 */
2199 if (sigmask) {
2200 if (sigsetsize != sizeof(compat_sigset_t))
2201 return -EINVAL;
2202 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2203 return -EFAULT;
2204 sigset_from_compat(&ksigmask, &csigmask);
2205 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2206 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2207 }
2208
2209 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2210
2211 /*
2212 * If we changed the signal mask, we need to restore the original one.
2213 * In case we've got a signal while waiting, we do not restore the
2214 * signal mask yet, and we allow do_signal() to deliver the signal on
2215 * the way back to userspace, before the signal mask is restored.
2216 */
2217 if (sigmask) {
2218 if (err == -EINTR) {
2219 memcpy(&current->saved_sigmask, &sigsaved,
2220 sizeof(sigsaved));
2221 set_restore_sigmask();
2222 } else
2223 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2224 }
2225
2226 return err;
2227 }
2228 #endif /* HAVE_SET_RESTORE_SIGMASK */
2229
2230 #endif /* CONFIG_EPOLL */
2231
2232 #ifdef CONFIG_SIGNALFD
2233
2234 asmlinkage long compat_sys_signalfd4(int ufd,
2235 const compat_sigset_t __user *sigmask,
2236 compat_size_t sigsetsize, int flags)
2237 {
2238 compat_sigset_t ss32;
2239 sigset_t tmp;
2240 sigset_t __user *ksigmask;
2241
2242 if (sigsetsize != sizeof(compat_sigset_t))
2243 return -EINVAL;
2244 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2245 return -EFAULT;
2246 sigset_from_compat(&tmp, &ss32);
2247 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2248 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2249 return -EFAULT;
2250
2251 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2252 }
2253
2254 asmlinkage long compat_sys_signalfd(int ufd,
2255 const compat_sigset_t __user *sigmask,
2256 compat_size_t sigsetsize)
2257 {
2258 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2259 }
2260 #endif /* CONFIG_SIGNALFD */
2261
2262 #ifdef CONFIG_TIMERFD
2263
2264 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2265 const struct compat_itimerspec __user *utmr,
2266 struct compat_itimerspec __user *otmr)
2267 {
2268 int error;
2269 struct itimerspec t;
2270 struct itimerspec __user *ut;
2271
2272 if (get_compat_itimerspec(&t, utmr))
2273 return -EFAULT;
2274 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2275 if (copy_to_user(&ut[0], &t, sizeof(t)))
2276 return -EFAULT;
2277 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2278 if (!error && otmr)
2279 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2280 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2281
2282 return error;
2283 }
2284
2285 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2286 struct compat_itimerspec __user *otmr)
2287 {
2288 int error;
2289 struct itimerspec t;
2290 struct itimerspec __user *ut;
2291
2292 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2293 error = sys_timerfd_gettime(ufd, ut);
2294 if (!error)
2295 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2296 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2297
2298 return error;
2299 }
2300
2301 #endif /* CONFIG_TIMERFD */
Linux ARM platform port for MOXA ART SoC