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__tty_open(): use the correct type for saved_flags
[linux-2.6/next.git] / fs / compat.c
blob55efdfebdf5ae14f5937add03075fdc8e716819d
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/smp_lock.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/nfsd/nfsd.h>
44 #include <linux/nfsd/syscall.h>
45 #include <linux/personality.h>
46 #include <linux/rwsem.h>
47 #include <linux/tsacct_kern.h>
48 #include <linux/security.h>
49 #include <linux/highmem.h>
50 #include <linux/signal.h>
51 #include <linux/poll.h>
52 #include <linux/mm.h>
53 #include <linux/eventpoll.h>
54
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[0].tv_nsec == UTIME_NOW)
104 && tv[0].tv_sec != 0)
105 return -EINVAL;
106 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107 && tv[1].tv_sec != 0)
108 return -EINVAL;
109
110 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111 return 0;
112 }
113 return do_utimes(dfd, filename, t ? tv : NULL, flags);
114 }
115
116 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
117 {
118 struct timespec tv[2];
119
120 if (t) {
121 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
122 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
123 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
124 get_user(tv[1].tv_nsec, &t[1].tv_usec))
125 return -EFAULT;
126 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128 return -EINVAL;
129 tv[0].tv_nsec *= 1000;
130 tv[1].tv_nsec *= 1000;
131 }
132 return do_utimes(dfd, filename, t ? tv : NULL, 0);
133 }
134
135 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136 {
137 return compat_sys_futimesat(AT_FDCWD, filename, t);
138 }
139
140 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
141 {
142 compat_ino_t ino = stat->ino;
143 typeof(ubuf->st_uid) uid = 0;
144 typeof(ubuf->st_gid) gid = 0;
145 int err;
146
147 SET_UID(uid, stat->uid);
148 SET_GID(gid, stat->gid);
149
150 if ((u64) stat->size > MAX_NON_LFS ||
151 !old_valid_dev(stat->dev) ||
152 !old_valid_dev(stat->rdev))
153 return -EOVERFLOW;
154 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
155 return -EOVERFLOW;
156
157 if (clear_user(ubuf, sizeof(*ubuf)))
158 return -EFAULT;
159
160 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
161 err |= __put_user(ino, &ubuf->st_ino);
162 err |= __put_user(stat->mode, &ubuf->st_mode);
163 err |= __put_user(stat->nlink, &ubuf->st_nlink);
164 err |= __put_user(uid, &ubuf->st_uid);
165 err |= __put_user(gid, &ubuf->st_gid);
166 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
167 err |= __put_user(stat->size, &ubuf->st_size);
168 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
169 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
170 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
171 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
172 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
173 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
174 err |= __put_user(stat->blksize, &ubuf->st_blksize);
175 err |= __put_user(stat->blocks, &ubuf->st_blocks);
176 return err;
177 }
178
179 asmlinkage long compat_sys_newstat(char __user * filename,
180 struct compat_stat __user *statbuf)
181 {
182 struct kstat stat;
183 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
184
185 if (!error)
186 error = cp_compat_stat(&stat, statbuf);
187 return error;
188 }
189
190 asmlinkage long compat_sys_newlstat(char __user * filename,
191 struct compat_stat __user *statbuf)
192 {
193 struct kstat stat;
194 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
195
196 if (!error)
197 error = cp_compat_stat(&stat, statbuf);
198 return error;
199 }
200
201 #ifndef __ARCH_WANT_STAT64
202 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
203 struct compat_stat __user *statbuf, int flag)
204 {
205 struct kstat stat;
206 int error = -EINVAL;
207
208 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
209 goto out;
210
211 if (flag & AT_SYMLINK_NOFOLLOW)
212 error = vfs_lstat_fd(dfd, filename, &stat);
213 else
214 error = vfs_stat_fd(dfd, filename, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218
219 out:
220 return error;
221 }
222 #endif
223
224 asmlinkage long compat_sys_newfstat(unsigned int fd,
225 struct compat_stat __user * statbuf)
226 {
227 struct kstat stat;
228 int error = vfs_fstat(fd, &stat);
229
230 if (!error)
231 error = cp_compat_stat(&stat, statbuf);
232 return error;
233 }
234
235 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
236 {
237
238 if (sizeof ubuf->f_blocks == 4) {
239 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
240 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
241 return -EOVERFLOW;
242 /* f_files and f_ffree may be -1; it's okay
243 * to stuff that into 32 bits */
244 if (kbuf->f_files != 0xffffffffffffffffULL
245 && (kbuf->f_files & 0xffffffff00000000ULL))
246 return -EOVERFLOW;
247 if (kbuf->f_ffree != 0xffffffffffffffffULL
248 && (kbuf->f_ffree & 0xffffffff00000000ULL))
249 return -EOVERFLOW;
250 }
251 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
252 __put_user(kbuf->f_type, &ubuf->f_type) ||
253 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
254 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
255 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
256 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
257 __put_user(kbuf->f_files, &ubuf->f_files) ||
258 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
259 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
260 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
261 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
262 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
263 __put_user(0, &ubuf->f_spare[0]) ||
264 __put_user(0, &ubuf->f_spare[1]) ||
265 __put_user(0, &ubuf->f_spare[2]) ||
266 __put_user(0, &ubuf->f_spare[3]) ||
267 __put_user(0, &ubuf->f_spare[4]))
268 return -EFAULT;
269 return 0;
270 }
271
272 /*
273 * The following statfs calls are copies of code from fs/open.c and
274 * should be checked against those from time to time
275 */
276 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
277 {
278 struct path path;
279 int error;
280
281 error = user_path(pathname, &path);
282 if (!error) {
283 struct kstatfs tmp;
284 error = vfs_statfs(path.dentry, &tmp);
285 if (!error)
286 error = put_compat_statfs(buf, &tmp);
287 path_put(&path);
288 }
289 return error;
290 }
291
292 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
293 {
294 struct file * file;
295 struct kstatfs tmp;
296 int error;
297
298 error = -EBADF;
299 file = fget(fd);
300 if (!file)
301 goto out;
302 error = vfs_statfs(file->f_path.dentry, &tmp);
303 if (!error)
304 error = put_compat_statfs(buf, &tmp);
305 fput(file);
306 out:
307 return error;
308 }
309
310 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
311 {
312 if (sizeof ubuf->f_blocks == 4) {
313 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
314 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
315 return -EOVERFLOW;
316 /* f_files and f_ffree may be -1; it's okay
317 * to stuff that into 32 bits */
318 if (kbuf->f_files != 0xffffffffffffffffULL
319 && (kbuf->f_files & 0xffffffff00000000ULL))
320 return -EOVERFLOW;
321 if (kbuf->f_ffree != 0xffffffffffffffffULL
322 && (kbuf->f_ffree & 0xffffffff00000000ULL))
323 return -EOVERFLOW;
324 }
325 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
326 __put_user(kbuf->f_type, &ubuf->f_type) ||
327 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
328 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
329 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
330 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
331 __put_user(kbuf->f_files, &ubuf->f_files) ||
332 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
333 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
334 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
335 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
336 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
337 return -EFAULT;
338 return 0;
339 }
340
341 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
342 {
343 struct path path;
344 int error;
345
346 if (sz != sizeof(*buf))
347 return -EINVAL;
348
349 error = user_path(pathname, &path);
350 if (!error) {
351 struct kstatfs tmp;
352 error = vfs_statfs(path.dentry, &tmp);
353 if (!error)
354 error = put_compat_statfs64(buf, &tmp);
355 path_put(&path);
356 }
357 return error;
358 }
359
360 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
361 {
362 struct file * file;
363 struct kstatfs tmp;
364 int error;
365
366 if (sz != sizeof(*buf))
367 return -EINVAL;
368
369 error = -EBADF;
370 file = fget(fd);
371 if (!file)
372 goto out;
373 error = vfs_statfs(file->f_path.dentry, &tmp);
374 if (!error)
375 error = put_compat_statfs64(buf, &tmp);
376 fput(file);
377 out:
378 return error;
379 }
380
381 /*
382 * This is a copy of sys_ustat, just dealing with a structure layout.
383 * Given how simple this syscall is that apporach is more maintainable
384 * than the various conversion hacks.
385 */
386 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
387 {
388 struct super_block *sb;
389 struct compat_ustat tmp;
390 struct kstatfs sbuf;
391 int err;
392
393 sb = user_get_super(new_decode_dev(dev));
394 if (!sb)
395 return -EINVAL;
396 err = vfs_statfs(sb->s_root, &sbuf);
397 drop_super(sb);
398 if (err)
399 return err;
400
401 memset(&tmp, 0, sizeof(struct compat_ustat));
402 tmp.f_tfree = sbuf.f_bfree;
403 tmp.f_tinode = sbuf.f_ffree;
404 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
405 return -EFAULT;
406 return 0;
407 }
408
409 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
410 {
411 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
412 __get_user(kfl->l_type, &ufl->l_type) ||
413 __get_user(kfl->l_whence, &ufl->l_whence) ||
414 __get_user(kfl->l_start, &ufl->l_start) ||
415 __get_user(kfl->l_len, &ufl->l_len) ||
416 __get_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419 }
420
421 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
422 {
423 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
424 __put_user(kfl->l_type, &ufl->l_type) ||
425 __put_user(kfl->l_whence, &ufl->l_whence) ||
426 __put_user(kfl->l_start, &ufl->l_start) ||
427 __put_user(kfl->l_len, &ufl->l_len) ||
428 __put_user(kfl->l_pid, &ufl->l_pid))
429 return -EFAULT;
430 return 0;
431 }
432
433 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
434 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
435 {
436 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
437 __get_user(kfl->l_type, &ufl->l_type) ||
438 __get_user(kfl->l_whence, &ufl->l_whence) ||
439 __get_user(kfl->l_start, &ufl->l_start) ||
440 __get_user(kfl->l_len, &ufl->l_len) ||
441 __get_user(kfl->l_pid, &ufl->l_pid))
442 return -EFAULT;
443 return 0;
444 }
445 #endif
446
447 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
448 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
449 {
450 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
451 __put_user(kfl->l_type, &ufl->l_type) ||
452 __put_user(kfl->l_whence, &ufl->l_whence) ||
453 __put_user(kfl->l_start, &ufl->l_start) ||
454 __put_user(kfl->l_len, &ufl->l_len) ||
455 __put_user(kfl->l_pid, &ufl->l_pid))
456 return -EFAULT;
457 return 0;
458 }
459 #endif
460
461 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
462 unsigned long arg)
463 {
464 mm_segment_t old_fs;
465 struct flock f;
466 long ret;
467
468 switch (cmd) {
469 case F_GETLK:
470 case F_SETLK:
471 case F_SETLKW:
472 ret = get_compat_flock(&f, compat_ptr(arg));
473 if (ret != 0)
474 break;
475 old_fs = get_fs();
476 set_fs(KERNEL_DS);
477 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
478 set_fs(old_fs);
479 if (cmd == F_GETLK && ret == 0) {
480 /* GETLK was successfule and we need to return the data...
481 * but it needs to fit in the compat structure.
482 * l_start shouldn't be too big, unless the original
483 * start + end is greater than COMPAT_OFF_T_MAX, in which
484 * case the app was asking for trouble, so we return
485 * -EOVERFLOW in that case.
486 * l_len could be too big, in which case we just truncate it,
487 * and only allow the app to see that part of the conflicting
488 * lock that might make sense to it anyway
489 */
490
491 if (f.l_start > COMPAT_OFF_T_MAX)
492 ret = -EOVERFLOW;
493 if (f.l_len > COMPAT_OFF_T_MAX)
494 f.l_len = COMPAT_OFF_T_MAX;
495 if (ret == 0)
496 ret = put_compat_flock(&f, compat_ptr(arg));
497 }
498 break;
499
500 case F_GETLK64:
501 case F_SETLK64:
502 case F_SETLKW64:
503 ret = get_compat_flock64(&f, compat_ptr(arg));
504 if (ret != 0)
505 break;
506 old_fs = get_fs();
507 set_fs(KERNEL_DS);
508 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
509 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
510 (unsigned long)&f);
511 set_fs(old_fs);
512 if (cmd == F_GETLK64 && ret == 0) {
513 /* need to return lock information - see above for commentary */
514 if (f.l_start > COMPAT_LOFF_T_MAX)
515 ret = -EOVERFLOW;
516 if (f.l_len > COMPAT_LOFF_T_MAX)
517 f.l_len = COMPAT_LOFF_T_MAX;
518 if (ret == 0)
519 ret = put_compat_flock64(&f, compat_ptr(arg));
520 }
521 break;
522
523 default:
524 ret = sys_fcntl(fd, cmd, arg);
525 break;
526 }
527 return ret;
528 }
529
530 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
531 unsigned long arg)
532 {
533 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
534 return -EINVAL;
535 return compat_sys_fcntl64(fd, cmd, arg);
536 }
537
538 asmlinkage long
539 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
540 {
541 long ret;
542 aio_context_t ctx64;
543
544 mm_segment_t oldfs = get_fs();
545 if (unlikely(get_user(ctx64, ctx32p)))
546 return -EFAULT;
547
548 set_fs(KERNEL_DS);
549 /* The __user pointer cast is valid because of the set_fs() */
550 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
551 set_fs(oldfs);
552 /* truncating is ok because it's a user address */
553 if (!ret)
554 ret = put_user((u32) ctx64, ctx32p);
555 return ret;
556 }
557
558 asmlinkage long
559 compat_sys_io_getevents(aio_context_t ctx_id,
560 unsigned long min_nr,
561 unsigned long nr,
562 struct io_event __user *events,
563 struct compat_timespec __user *timeout)
564 {
565 long ret;
566 struct timespec t;
567 struct timespec __user *ut = NULL;
568
569 ret = -EFAULT;
570 if (unlikely(!access_ok(VERIFY_WRITE, events,
571 nr * sizeof(struct io_event))))
572 goto out;
573 if (timeout) {
574 if (get_compat_timespec(&t, timeout))
575 goto out;
576
577 ut = compat_alloc_user_space(sizeof(*ut));
578 if (copy_to_user(ut, &t, sizeof(t)) )
579 goto out;
580 }
581 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
582 out:
583 return ret;
584 }
585
586 static inline long
587 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
588 {
589 compat_uptr_t uptr;
590 int i;
591
592 for (i = 0; i < nr; ++i) {
593 if (get_user(uptr, ptr32 + i))
594 return -EFAULT;
595 if (put_user(compat_ptr(uptr), ptr64 + i))
596 return -EFAULT;
597 }
598 return 0;
599 }
600
601 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
602
603 asmlinkage long
604 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
605 {
606 struct iocb __user * __user *iocb64;
607 long ret;
608
609 if (unlikely(nr < 0))
610 return -EINVAL;
611
612 if (nr > MAX_AIO_SUBMITS)
613 nr = MAX_AIO_SUBMITS;
614
615 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
616 ret = copy_iocb(nr, iocb, iocb64);
617 if (!ret)
618 ret = sys_io_submit(ctx_id, nr, iocb64);
619 return ret;
620 }
621
622 struct compat_ncp_mount_data {
623 compat_int_t version;
624 compat_uint_t ncp_fd;
625 __compat_uid_t mounted_uid;
626 compat_pid_t wdog_pid;
627 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
628 compat_uint_t time_out;
629 compat_uint_t retry_count;
630 compat_uint_t flags;
631 __compat_uid_t uid;
632 __compat_gid_t gid;
633 compat_mode_t file_mode;
634 compat_mode_t dir_mode;
635 };
636
637 struct compat_ncp_mount_data_v4 {
638 compat_int_t version;
639 compat_ulong_t flags;
640 compat_ulong_t mounted_uid;
641 compat_long_t wdog_pid;
642 compat_uint_t ncp_fd;
643 compat_uint_t time_out;
644 compat_uint_t retry_count;
645 compat_ulong_t uid;
646 compat_ulong_t gid;
647 compat_ulong_t file_mode;
648 compat_ulong_t dir_mode;
649 };
650
651 static void *do_ncp_super_data_conv(void *raw_data)
652 {
653 int version = *(unsigned int *)raw_data;
654
655 if (version == 3) {
656 struct compat_ncp_mount_data *c_n = raw_data;
657 struct ncp_mount_data *n = raw_data;
658
659 n->dir_mode = c_n->dir_mode;
660 n->file_mode = c_n->file_mode;
661 n->gid = c_n->gid;
662 n->uid = c_n->uid;
663 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
664 n->wdog_pid = c_n->wdog_pid;
665 n->mounted_uid = c_n->mounted_uid;
666 } else if (version == 4) {
667 struct compat_ncp_mount_data_v4 *c_n = raw_data;
668 struct ncp_mount_data_v4 *n = raw_data;
669
670 n->dir_mode = c_n->dir_mode;
671 n->file_mode = c_n->file_mode;
672 n->gid = c_n->gid;
673 n->uid = c_n->uid;
674 n->retry_count = c_n->retry_count;
675 n->time_out = c_n->time_out;
676 n->ncp_fd = c_n->ncp_fd;
677 n->wdog_pid = c_n->wdog_pid;
678 n->mounted_uid = c_n->mounted_uid;
679 n->flags = c_n->flags;
680 } else if (version != 5) {
681 return NULL;
682 }
683
684 return raw_data;
685 }
686
687 struct compat_smb_mount_data {
688 compat_int_t version;
689 __compat_uid_t mounted_uid;
690 __compat_uid_t uid;
691 __compat_gid_t gid;
692 compat_mode_t file_mode;
693 compat_mode_t dir_mode;
694 };
695
696 static void *do_smb_super_data_conv(void *raw_data)
697 {
698 struct smb_mount_data *s = raw_data;
699 struct compat_smb_mount_data *c_s = raw_data;
700
701 if (c_s->version != SMB_MOUNT_OLDVERSION)
702 goto out;
703 s->dir_mode = c_s->dir_mode;
704 s->file_mode = c_s->file_mode;
705 s->gid = c_s->gid;
706 s->uid = c_s->uid;
707 s->mounted_uid = c_s->mounted_uid;
708 out:
709 return raw_data;
710 }
711
712 struct compat_nfs_string {
713 compat_uint_t len;
714 compat_uptr_t data;
715 };
716
717 static inline void compat_nfs_string(struct nfs_string *dst,
718 struct compat_nfs_string *src)
719 {
720 dst->data = compat_ptr(src->data);
721 dst->len = src->len;
722 }
723
724 struct compat_nfs4_mount_data_v1 {
725 compat_int_t version;
726 compat_int_t flags;
727 compat_int_t rsize;
728 compat_int_t wsize;
729 compat_int_t timeo;
730 compat_int_t retrans;
731 compat_int_t acregmin;
732 compat_int_t acregmax;
733 compat_int_t acdirmin;
734 compat_int_t acdirmax;
735 struct compat_nfs_string client_addr;
736 struct compat_nfs_string mnt_path;
737 struct compat_nfs_string hostname;
738 compat_uint_t host_addrlen;
739 compat_uptr_t host_addr;
740 compat_int_t proto;
741 compat_int_t auth_flavourlen;
742 compat_uptr_t auth_flavours;
743 };
744
745 static int do_nfs4_super_data_conv(void *raw_data)
746 {
747 int version = *(compat_uint_t *) raw_data;
748
749 if (version == 1) {
750 struct compat_nfs4_mount_data_v1 *raw = raw_data;
751 struct nfs4_mount_data *real = raw_data;
752
753 /* copy the fields backwards */
754 real->auth_flavours = compat_ptr(raw->auth_flavours);
755 real->auth_flavourlen = raw->auth_flavourlen;
756 real->proto = raw->proto;
757 real->host_addr = compat_ptr(raw->host_addr);
758 real->host_addrlen = raw->host_addrlen;
759 compat_nfs_string(&real->hostname, &raw->hostname);
760 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
761 compat_nfs_string(&real->client_addr, &raw->client_addr);
762 real->acdirmax = raw->acdirmax;
763 real->acdirmin = raw->acdirmin;
764 real->acregmax = raw->acregmax;
765 real->acregmin = raw->acregmin;
766 real->retrans = raw->retrans;
767 real->timeo = raw->timeo;
768 real->wsize = raw->wsize;
769 real->rsize = raw->rsize;
770 real->flags = raw->flags;
771 real->version = raw->version;
772 }
773
774 return 0;
775 }
776
777 #define SMBFS_NAME "smbfs"
778 #define NCPFS_NAME "ncpfs"
779 #define NFS4_NAME "nfs4"
780
781 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
782 char __user * type, unsigned long flags,
783 void __user * data)
784 {
785 unsigned long type_page;
786 unsigned long data_page;
787 unsigned long dev_page;
788 char *dir_page;
789 int retval;
790
791 retval = copy_mount_options (type, &type_page);
792 if (retval < 0)
793 goto out;
794
795 dir_page = getname(dir_name);
796 retval = PTR_ERR(dir_page);
797 if (IS_ERR(dir_page))
798 goto out1;
799
800 retval = copy_mount_options (dev_name, &dev_page);
801 if (retval < 0)
802 goto out2;
803
804 retval = copy_mount_options (data, &data_page);
805 if (retval < 0)
806 goto out3;
807
808 retval = -EINVAL;
809
810 if (type_page && data_page) {
811 if (!strcmp((char *)type_page, SMBFS_NAME)) {
812 do_smb_super_data_conv((void *)data_page);
813 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
814 do_ncp_super_data_conv((void *)data_page);
815 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
816 if (do_nfs4_super_data_conv((void *) data_page))
817 goto out4;
818 }
819 }
820
821 lock_kernel();
822 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
823 flags, (void*)data_page);
824 unlock_kernel();
825
826 out4:
827 free_page(data_page);
828 out3:
829 free_page(dev_page);
830 out2:
831 putname(dir_page);
832 out1:
833 free_page(type_page);
834 out:
835 return retval;
836 }
837
838 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
839
840 struct compat_old_linux_dirent {
841 compat_ulong_t d_ino;
842 compat_ulong_t d_offset;
843 unsigned short d_namlen;
844 char d_name[1];
845 };
846
847 struct compat_readdir_callback {
848 struct compat_old_linux_dirent __user *dirent;
849 int result;
850 };
851
852 static int compat_fillonedir(void *__buf, const char *name, int namlen,
853 loff_t offset, u64 ino, unsigned int d_type)
854 {
855 struct compat_readdir_callback *buf = __buf;
856 struct compat_old_linux_dirent __user *dirent;
857 compat_ulong_t d_ino;
858
859 if (buf->result)
860 return -EINVAL;
861 d_ino = ino;
862 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
863 buf->result = -EOVERFLOW;
864 return -EOVERFLOW;
865 }
866 buf->result++;
867 dirent = buf->dirent;
868 if (!access_ok(VERIFY_WRITE, dirent,
869 (unsigned long)(dirent->d_name + namlen + 1) -
870 (unsigned long)dirent))
871 goto efault;
872 if ( __put_user(d_ino, &dirent->d_ino) ||
873 __put_user(offset, &dirent->d_offset) ||
874 __put_user(namlen, &dirent->d_namlen) ||
875 __copy_to_user(dirent->d_name, name, namlen) ||
876 __put_user(0, dirent->d_name + namlen))
877 goto efault;
878 return 0;
879 efault:
880 buf->result = -EFAULT;
881 return -EFAULT;
882 }
883
884 asmlinkage long compat_sys_old_readdir(unsigned int fd,
885 struct compat_old_linux_dirent __user *dirent, unsigned int count)
886 {
887 int error;
888 struct file *file;
889 struct compat_readdir_callback buf;
890
891 error = -EBADF;
892 file = fget(fd);
893 if (!file)
894 goto out;
895
896 buf.result = 0;
897 buf.dirent = dirent;
898
899 error = vfs_readdir(file, compat_fillonedir, &buf);
900 if (buf.result)
901 error = buf.result;
902
903 fput(file);
904 out:
905 return error;
906 }
907
908 struct compat_linux_dirent {
909 compat_ulong_t d_ino;
910 compat_ulong_t d_off;
911 unsigned short d_reclen;
912 char d_name[1];
913 };
914
915 struct compat_getdents_callback {
916 struct compat_linux_dirent __user *current_dir;
917 struct compat_linux_dirent __user *previous;
918 int count;
919 int error;
920 };
921
922 static int compat_filldir(void *__buf, const char *name, int namlen,
923 loff_t offset, u64 ino, unsigned int d_type)
924 {
925 struct compat_linux_dirent __user * dirent;
926 struct compat_getdents_callback *buf = __buf;
927 compat_ulong_t d_ino;
928 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
929
930 buf->error = -EINVAL; /* only used if we fail.. */
931 if (reclen > buf->count)
932 return -EINVAL;
933 d_ino = ino;
934 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
935 buf->error = -EOVERFLOW;
936 return -EOVERFLOW;
937 }
938 dirent = buf->previous;
939 if (dirent) {
940 if (__put_user(offset, &dirent->d_off))
941 goto efault;
942 }
943 dirent = buf->current_dir;
944 if (__put_user(d_ino, &dirent->d_ino))
945 goto efault;
946 if (__put_user(reclen, &dirent->d_reclen))
947 goto efault;
948 if (copy_to_user(dirent->d_name, name, namlen))
949 goto efault;
950 if (__put_user(0, dirent->d_name + namlen))
951 goto efault;
952 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
953 goto efault;
954 buf->previous = dirent;
955 dirent = (void __user *)dirent + reclen;
956 buf->current_dir = dirent;
957 buf->count -= reclen;
958 return 0;
959 efault:
960 buf->error = -EFAULT;
961 return -EFAULT;
962 }
963
964 asmlinkage long compat_sys_getdents(unsigned int fd,
965 struct compat_linux_dirent __user *dirent, unsigned int count)
966 {
967 struct file * file;
968 struct compat_linux_dirent __user * lastdirent;
969 struct compat_getdents_callback buf;
970 int error;
971
972 error = -EFAULT;
973 if (!access_ok(VERIFY_WRITE, dirent, count))
974 goto out;
975
976 error = -EBADF;
977 file = fget(fd);
978 if (!file)
979 goto out;
980
981 buf.current_dir = dirent;
982 buf.previous = NULL;
983 buf.count = count;
984 buf.error = 0;
985
986 error = vfs_readdir(file, compat_filldir, &buf);
987 if (error >= 0)
988 error = buf.error;
989 lastdirent = buf.previous;
990 if (lastdirent) {
991 if (put_user(file->f_pos, &lastdirent->d_off))
992 error = -EFAULT;
993 else
994 error = count - buf.count;
995 }
996 fput(file);
997 out:
998 return error;
999 }
1000
1001 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1002
1003 struct compat_getdents_callback64 {
1004 struct linux_dirent64 __user *current_dir;
1005 struct linux_dirent64 __user *previous;
1006 int count;
1007 int error;
1008 };
1009
1010 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1011 u64 ino, unsigned int d_type)
1012 {
1013 struct linux_dirent64 __user *dirent;
1014 struct compat_getdents_callback64 *buf = __buf;
1015 int jj = NAME_OFFSET(dirent);
1016 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1017 u64 off;
1018
1019 buf->error = -EINVAL; /* only used if we fail.. */
1020 if (reclen > buf->count)
1021 return -EINVAL;
1022 dirent = buf->previous;
1023
1024 if (dirent) {
1025 if (__put_user_unaligned(offset, &dirent->d_off))
1026 goto efault;
1027 }
1028 dirent = buf->current_dir;
1029 if (__put_user_unaligned(ino, &dirent->d_ino))
1030 goto efault;
1031 off = 0;
1032 if (__put_user_unaligned(off, &dirent->d_off))
1033 goto efault;
1034 if (__put_user(reclen, &dirent->d_reclen))
1035 goto efault;
1036 if (__put_user(d_type, &dirent->d_type))
1037 goto efault;
1038 if (copy_to_user(dirent->d_name, name, namlen))
1039 goto efault;
1040 if (__put_user(0, dirent->d_name + namlen))
1041 goto efault;
1042 buf->previous = dirent;
1043 dirent = (void __user *)dirent + reclen;
1044 buf->current_dir = dirent;
1045 buf->count -= reclen;
1046 return 0;
1047 efault:
1048 buf->error = -EFAULT;
1049 return -EFAULT;
1050 }
1051
1052 asmlinkage long compat_sys_getdents64(unsigned int fd,
1053 struct linux_dirent64 __user * dirent, unsigned int count)
1054 {
1055 struct file * file;
1056 struct linux_dirent64 __user * lastdirent;
1057 struct compat_getdents_callback64 buf;
1058 int error;
1059
1060 error = -EFAULT;
1061 if (!access_ok(VERIFY_WRITE, dirent, count))
1062 goto out;
1063
1064 error = -EBADF;
1065 file = fget(fd);
1066 if (!file)
1067 goto out;
1068
1069 buf.current_dir = dirent;
1070 buf.previous = NULL;
1071 buf.count = count;
1072 buf.error = 0;
1073
1074 error = vfs_readdir(file, compat_filldir64, &buf);
1075 if (error >= 0)
1076 error = buf.error;
1077 lastdirent = buf.previous;
1078 if (lastdirent) {
1079 typeof(lastdirent->d_off) d_off = file->f_pos;
1080 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1081 error = -EFAULT;
1082 else
1083 error = count - buf.count;
1084 }
1085 fput(file);
1086 out:
1087 return error;
1088 }
1089 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1090
1091 static ssize_t compat_do_readv_writev(int type, struct file *file,
1092 const struct compat_iovec __user *uvector,
1093 unsigned long nr_segs, loff_t *pos)
1094 {
1095 compat_ssize_t tot_len;
1096 struct iovec iovstack[UIO_FASTIOV];
1097 struct iovec *iov=iovstack, *vector;
1098 ssize_t ret;
1099 int seg;
1100 io_fn_t fn;
1101 iov_fn_t fnv;
1102
1103 /*
1104 * SuS says "The readv() function *may* fail if the iovcnt argument
1105 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1106 * traditionally returned zero for zero segments, so...
1107 */
1108 ret = 0;
1109 if (nr_segs == 0)
1110 goto out;
1111
1112 /*
1113 * First get the "struct iovec" from user memory and
1114 * verify all the pointers
1115 */
1116 ret = -EINVAL;
1117 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1118 goto out;
1119 if (!file->f_op)
1120 goto out;
1121 if (nr_segs > UIO_FASTIOV) {
1122 ret = -ENOMEM;
1123 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1124 if (!iov)
1125 goto out;
1126 }
1127 ret = -EFAULT;
1128 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1129 goto out;
1130
1131 /*
1132 * Single unix specification:
1133 * We should -EINVAL if an element length is not >= 0 and fitting an
1134 * ssize_t. The total length is fitting an ssize_t
1135 *
1136 * Be careful here because iov_len is a size_t not an ssize_t
1137 */
1138 tot_len = 0;
1139 vector = iov;
1140 ret = -EINVAL;
1141 for (seg = 0 ; seg < nr_segs; seg++) {
1142 compat_ssize_t tmp = tot_len;
1143 compat_ssize_t len;
1144 compat_uptr_t buf;
1145
1146 if (__get_user(len, &uvector->iov_len) ||
1147 __get_user(buf, &uvector->iov_base)) {
1148 ret = -EFAULT;
1149 goto out;
1150 }
1151 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1152 goto out;
1153 tot_len += len;
1154 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1155 goto out;
1156 vector->iov_base = compat_ptr(buf);
1157 vector->iov_len = (compat_size_t) len;
1158 uvector++;
1159 vector++;
1160 }
1161 if (tot_len == 0) {
1162 ret = 0;
1163 goto out;
1164 }
1165
1166 ret = rw_verify_area(type, file, pos, tot_len);
1167 if (ret < 0)
1168 goto out;
1169
1170 fnv = NULL;
1171 if (type == READ) {
1172 fn = file->f_op->read;
1173 fnv = file->f_op->aio_read;
1174 } else {
1175 fn = (io_fn_t)file->f_op->write;
1176 fnv = file->f_op->aio_write;
1177 }
1178
1179 if (fnv)
1180 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1181 pos, fnv);
1182 else
1183 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1184
1185 out:
1186 if (iov != iovstack)
1187 kfree(iov);
1188 if ((ret + (type == READ)) > 0) {
1189 struct dentry *dentry = file->f_path.dentry;
1190 if (type == READ)
1191 fsnotify_access(dentry);
1192 else
1193 fsnotify_modify(dentry);
1194 }
1195 return ret;
1196 }
1197
1198 asmlinkage ssize_t
1199 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1200 {
1201 struct file *file;
1202 ssize_t ret = -EBADF;
1203
1204 file = fget(fd);
1205 if (!file)
1206 return -EBADF;
1207
1208 if (!(file->f_mode & FMODE_READ))
1209 goto out;
1210
1211 ret = -EINVAL;
1212 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1213 goto out;
1214
1215 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1216
1217 out:
1218 if (ret > 0)
1219 add_rchar(current, ret);
1220 inc_syscr(current);
1221 fput(file);
1222 return ret;
1223 }
1224
1225 asmlinkage ssize_t
1226 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1227 {
1228 struct file *file;
1229 ssize_t ret = -EBADF;
1230
1231 file = fget(fd);
1232 if (!file)
1233 return -EBADF;
1234 if (!(file->f_mode & FMODE_WRITE))
1235 goto out;
1236
1237 ret = -EINVAL;
1238 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1239 goto out;
1240
1241 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1242
1243 out:
1244 if (ret > 0)
1245 add_wchar(current, ret);
1246 inc_syscw(current);
1247 fput(file);
1248 return ret;
1249 }
1250
1251 asmlinkage long
1252 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1253 unsigned int nr_segs, unsigned int flags)
1254 {
1255 unsigned i;
1256 struct iovec __user *iov;
1257 if (nr_segs > UIO_MAXIOV)
1258 return -EINVAL;
1259 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1260 for (i = 0; i < nr_segs; i++) {
1261 struct compat_iovec v;
1262 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1263 get_user(v.iov_len, &iov32[i].iov_len) ||
1264 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1265 put_user(v.iov_len, &iov[i].iov_len))
1266 return -EFAULT;
1267 }
1268 return sys_vmsplice(fd, iov, nr_segs, flags);
1269 }
1270
1271 /*
1272 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1273 * O_LARGEFILE flag.
1274 */
1275 asmlinkage long
1276 compat_sys_open(const char __user *filename, int flags, int mode)
1277 {
1278 return do_sys_open(AT_FDCWD, filename, flags, mode);
1279 }
1280
1281 /*
1282 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1283 * O_LARGEFILE flag.
1284 */
1285 asmlinkage long
1286 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1287 {
1288 return do_sys_open(dfd, filename, flags, mode);
1289 }
1290
1291 /*
1292 * compat_count() counts the number of arguments/envelopes. It is basically
1293 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1294 * and envp pointers.
1295 */
1296 static int compat_count(compat_uptr_t __user *argv, int max)
1297 {
1298 int i = 0;
1299
1300 if (argv != NULL) {
1301 for (;;) {
1302 compat_uptr_t p;
1303
1304 if (get_user(p, argv))
1305 return -EFAULT;
1306 if (!p)
1307 break;
1308 argv++;
1309 if (i++ >= max)
1310 return -E2BIG;
1311 }
1312 }
1313 return i;
1314 }
1315
1316 /*
1317 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1318 * except that it works with 32 bit argv and envp pointers.
1319 */
1320 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1321 struct linux_binprm *bprm)
1322 {
1323 struct page *kmapped_page = NULL;
1324 char *kaddr = NULL;
1325 unsigned long kpos = 0;
1326 int ret;
1327
1328 while (argc-- > 0) {
1329 compat_uptr_t str;
1330 int len;
1331 unsigned long pos;
1332
1333 if (get_user(str, argv+argc) ||
1334 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1335 ret = -EFAULT;
1336 goto out;
1337 }
1338
1339 if (len > MAX_ARG_STRLEN) {
1340 ret = -E2BIG;
1341 goto out;
1342 }
1343
1344 /* We're going to work our way backwords. */
1345 pos = bprm->p;
1346 str += len;
1347 bprm->p -= len;
1348
1349 while (len > 0) {
1350 int offset, bytes_to_copy;
1351
1352 offset = pos % PAGE_SIZE;
1353 if (offset == 0)
1354 offset = PAGE_SIZE;
1355
1356 bytes_to_copy = offset;
1357 if (bytes_to_copy > len)
1358 bytes_to_copy = len;
1359
1360 offset -= bytes_to_copy;
1361 pos -= bytes_to_copy;
1362 str -= bytes_to_copy;
1363 len -= bytes_to_copy;
1364
1365 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1366 struct page *page;
1367
1368 #ifdef CONFIG_STACK_GROWSUP
1369 ret = expand_stack_downwards(bprm->vma, pos);
1370 if (ret < 0) {
1371 /* We've exceed the stack rlimit. */
1372 ret = -E2BIG;
1373 goto out;
1374 }
1375 #endif
1376 ret = get_user_pages(current, bprm->mm, pos,
1377 1, 1, 1, &page, NULL);
1378 if (ret <= 0) {
1379 /* We've exceed the stack rlimit. */
1380 ret = -E2BIG;
1381 goto out;
1382 }
1383
1384 if (kmapped_page) {
1385 flush_kernel_dcache_page(kmapped_page);
1386 kunmap(kmapped_page);
1387 put_page(kmapped_page);
1388 }
1389 kmapped_page = page;
1390 kaddr = kmap(kmapped_page);
1391 kpos = pos & PAGE_MASK;
1392 flush_cache_page(bprm->vma, kpos,
1393 page_to_pfn(kmapped_page));
1394 }
1395 if (copy_from_user(kaddr+offset, compat_ptr(str),
1396 bytes_to_copy)) {
1397 ret = -EFAULT;
1398 goto out;
1399 }
1400 }
1401 }
1402 ret = 0;
1403 out:
1404 if (kmapped_page) {
1405 flush_kernel_dcache_page(kmapped_page);
1406 kunmap(kmapped_page);
1407 put_page(kmapped_page);
1408 }
1409 return ret;
1410 }
1411
1412 /*
1413 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1414 * that it processes 32 bit argv and envp pointers.
1415 */
1416 int compat_do_execve(char * filename,
1417 compat_uptr_t __user *argv,
1418 compat_uptr_t __user *envp,
1419 struct pt_regs * regs)
1420 {
1421 struct linux_binprm *bprm;
1422 struct file *file;
1423 struct files_struct *displaced;
1424 int retval;
1425
1426 retval = unshare_files(&displaced);
1427 if (retval)
1428 goto out_ret;
1429
1430 retval = -ENOMEM;
1431 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1432 if (!bprm)
1433 goto out_files;
1434
1435 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
1436 if (retval < 0)
1437 goto out_free;
1438 current->in_execve = 1;
1439
1440 retval = -ENOMEM;
1441 bprm->cred = prepare_exec_creds();
1442 if (!bprm->cred)
1443 goto out_unlock;
1444 check_unsafe_exec(bprm);
1445
1446 file = open_exec(filename);
1447 retval = PTR_ERR(file);
1448 if (IS_ERR(file))
1449 goto out_unlock;
1450
1451 sched_exec();
1452
1453 bprm->file = file;
1454 bprm->filename = filename;
1455 bprm->interp = filename;
1456
1457 retval = bprm_mm_init(bprm);
1458 if (retval)
1459 goto out_file;
1460
1461 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1462 if ((retval = bprm->argc) < 0)
1463 goto out;
1464
1465 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1466 if ((retval = bprm->envc) < 0)
1467 goto out;
1468
1469 retval = prepare_binprm(bprm);
1470 if (retval < 0)
1471 goto out;
1472
1473 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1474 if (retval < 0)
1475 goto out;
1476
1477 bprm->exec = bprm->p;
1478 retval = compat_copy_strings(bprm->envc, envp, bprm);
1479 if (retval < 0)
1480 goto out;
1481
1482 retval = compat_copy_strings(bprm->argc, argv, bprm);
1483 if (retval < 0)
1484 goto out;
1485
1486 retval = search_binary_handler(bprm, regs);
1487 if (retval < 0)
1488 goto out;
1489
1490 /* execve succeeded */
1491 current->in_execve = 0;
1492 mutex_unlock(&current->cred_exec_mutex);
1493 acct_update_integrals(current);
1494 free_bprm(bprm);
1495 if (displaced)
1496 put_files_struct(displaced);
1497 return retval;
1498
1499 out:
1500 if (bprm->mm)
1501 mmput(bprm->mm);
1502
1503 out_file:
1504 if (bprm->file) {
1505 allow_write_access(bprm->file);
1506 fput(bprm->file);
1507 }
1508
1509 out_unlock:
1510 current->in_execve = 0;
1511 mutex_unlock(&current->cred_exec_mutex);
1512
1513 out_free:
1514 free_bprm(bprm);
1515
1516 out_files:
1517 if (displaced)
1518 reset_files_struct(displaced);
1519 out_ret:
1520 return retval;
1521 }
1522
1523 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1524
1525 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1526 int timeval, int ret)
1527 {
1528 struct timespec ts;
1529
1530 if (!p)
1531 return ret;
1532
1533 if (current->personality & STICKY_TIMEOUTS)
1534 goto sticky;
1535
1536 /* No update for zero timeout */
1537 if (!end_time->tv_sec && !end_time->tv_nsec)
1538 return ret;
1539
1540 ktime_get_ts(&ts);
1541 ts = timespec_sub(*end_time, ts);
1542 if (ts.tv_sec < 0)
1543 ts.tv_sec = ts.tv_nsec = 0;
1544
1545 if (timeval) {
1546 struct compat_timeval rtv;
1547
1548 rtv.tv_sec = ts.tv_sec;
1549 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1550
1551 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1552 return ret;
1553 } else {
1554 struct compat_timespec rts;
1555
1556 rts.tv_sec = ts.tv_sec;
1557 rts.tv_nsec = ts.tv_nsec;
1558
1559 if (!copy_to_user(p, &rts, sizeof(rts)))
1560 return ret;
1561 }
1562 /*
1563 * If an application puts its timeval in read-only memory, we
1564 * don't want the Linux-specific update to the timeval to
1565 * cause a fault after the select has completed
1566 * successfully. However, because we're not updating the
1567 * timeval, we can't restart the system call.
1568 */
1569
1570 sticky:
1571 if (ret == -ERESTARTNOHAND)
1572 ret = -EINTR;
1573 return ret;
1574 }
1575
1576 /*
1577 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1578 * 64-bit unsigned longs.
1579 */
1580 static
1581 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1582 unsigned long *fdset)
1583 {
1584 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1585 if (ufdset) {
1586 unsigned long odd;
1587
1588 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1589 return -EFAULT;
1590
1591 odd = nr & 1UL;
1592 nr &= ~1UL;
1593 while (nr) {
1594 unsigned long h, l;
1595 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1596 return -EFAULT;
1597 ufdset += 2;
1598 *fdset++ = h << 32 | l;
1599 nr -= 2;
1600 }
1601 if (odd && __get_user(*fdset, ufdset))
1602 return -EFAULT;
1603 } else {
1604 /* Tricky, must clear full unsigned long in the
1605 * kernel fdset at the end, this makes sure that
1606 * actually happens.
1607 */
1608 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1609 }
1610 return 0;
1611 }
1612
1613 static
1614 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1615 unsigned long *fdset)
1616 {
1617 unsigned long odd;
1618 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1619
1620 if (!ufdset)
1621 return 0;
1622
1623 odd = nr & 1UL;
1624 nr &= ~1UL;
1625 while (nr) {
1626 unsigned long h, l;
1627 l = *fdset++;
1628 h = l >> 32;
1629 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1630 return -EFAULT;
1631 ufdset += 2;
1632 nr -= 2;
1633 }
1634 if (odd && __put_user(*fdset, ufdset))
1635 return -EFAULT;
1636 return 0;
1637 }
1638
1639
1640 /*
1641 * This is a virtual copy of sys_select from fs/select.c and probably
1642 * should be compared to it from time to time
1643 */
1644
1645 /*
1646 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1647 * like to be certain this leads to no problems. So I return
1648 * EINTR just for safety.
1649 *
1650 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1651 * I'm trying ERESTARTNOHAND which restart only when you want to.
1652 */
1653 #define MAX_SELECT_SECONDS \
1654 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1655
1656 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1657 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1658 struct timespec *end_time)
1659 {
1660 fd_set_bits fds;
1661 void *bits;
1662 int size, max_fds, ret = -EINVAL;
1663 struct fdtable *fdt;
1664 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1665
1666 if (n < 0)
1667 goto out_nofds;
1668
1669 /* max_fds can increase, so grab it once to avoid race */
1670 rcu_read_lock();
1671 fdt = files_fdtable(current->files);
1672 max_fds = fdt->max_fds;
1673 rcu_read_unlock();
1674 if (n > max_fds)
1675 n = max_fds;
1676
1677 /*
1678 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1679 * since we used fdset we need to allocate memory in units of
1680 * long-words.
1681 */
1682 size = FDS_BYTES(n);
1683 bits = stack_fds;
1684 if (size > sizeof(stack_fds) / 6) {
1685 bits = kmalloc(6 * size, GFP_KERNEL);
1686 ret = -ENOMEM;
1687 if (!bits)
1688 goto out_nofds;
1689 }
1690 fds.in = (unsigned long *) bits;
1691 fds.out = (unsigned long *) (bits + size);
1692 fds.ex = (unsigned long *) (bits + 2*size);
1693 fds.res_in = (unsigned long *) (bits + 3*size);
1694 fds.res_out = (unsigned long *) (bits + 4*size);
1695 fds.res_ex = (unsigned long *) (bits + 5*size);
1696
1697 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1698 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1699 (ret = compat_get_fd_set(n, exp, fds.ex)))
1700 goto out;
1701 zero_fd_set(n, fds.res_in);
1702 zero_fd_set(n, fds.res_out);
1703 zero_fd_set(n, fds.res_ex);
1704
1705 ret = do_select(n, &fds, end_time);
1706
1707 if (ret < 0)
1708 goto out;
1709 if (!ret) {
1710 ret = -ERESTARTNOHAND;
1711 if (signal_pending(current))
1712 goto out;
1713 ret = 0;
1714 }
1715
1716 if (compat_set_fd_set(n, inp, fds.res_in) ||
1717 compat_set_fd_set(n, outp, fds.res_out) ||
1718 compat_set_fd_set(n, exp, fds.res_ex))
1719 ret = -EFAULT;
1720 out:
1721 if (bits != stack_fds)
1722 kfree(bits);
1723 out_nofds:
1724 return ret;
1725 }
1726
1727 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1728 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1729 struct compat_timeval __user *tvp)
1730 {
1731 struct timespec end_time, *to = NULL;
1732 struct compat_timeval tv;
1733 int ret;
1734
1735 if (tvp) {
1736 if (copy_from_user(&tv, tvp, sizeof(tv)))
1737 return -EFAULT;
1738
1739 to = &end_time;
1740 if (poll_select_set_timeout(to,
1741 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1742 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1743 return -EINVAL;
1744 }
1745
1746 ret = compat_core_sys_select(n, inp, outp, exp, to);
1747 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1748
1749 return ret;
1750 }
1751
1752 #ifdef HAVE_SET_RESTORE_SIGMASK
1753 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1754 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1755 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1756 compat_size_t sigsetsize)
1757 {
1758 compat_sigset_t ss32;
1759 sigset_t ksigmask, sigsaved;
1760 struct compat_timespec ts;
1761 struct timespec end_time, *to = NULL;
1762 int ret;
1763
1764 if (tsp) {
1765 if (copy_from_user(&ts, tsp, sizeof(ts)))
1766 return -EFAULT;
1767
1768 to = &end_time;
1769 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1770 return -EINVAL;
1771 }
1772
1773 if (sigmask) {
1774 if (sigsetsize != sizeof(compat_sigset_t))
1775 return -EINVAL;
1776 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1777 return -EFAULT;
1778 sigset_from_compat(&ksigmask, &ss32);
1779
1780 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1781 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1782 }
1783
1784 ret = compat_core_sys_select(n, inp, outp, exp, to);
1785 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1786
1787 if (ret == -ERESTARTNOHAND) {
1788 /*
1789 * Don't restore the signal mask yet. Let do_signal() deliver
1790 * the signal on the way back to userspace, before the signal
1791 * mask is restored.
1792 */
1793 if (sigmask) {
1794 memcpy(&current->saved_sigmask, &sigsaved,
1795 sizeof(sigsaved));
1796 set_restore_sigmask();
1797 }
1798 } else if (sigmask)
1799 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1800
1801 return ret;
1802 }
1803
1804 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1805 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1806 struct compat_timespec __user *tsp, void __user *sig)
1807 {
1808 compat_size_t sigsetsize = 0;
1809 compat_uptr_t up = 0;
1810
1811 if (sig) {
1812 if (!access_ok(VERIFY_READ, sig,
1813 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1814 __get_user(up, (compat_uptr_t __user *)sig) ||
1815 __get_user(sigsetsize,
1816 (compat_size_t __user *)(sig+sizeof(up))))
1817 return -EFAULT;
1818 }
1819 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1820 sigsetsize);
1821 }
1822
1823 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1824 unsigned int nfds, struct compat_timespec __user *tsp,
1825 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1826 {
1827 compat_sigset_t ss32;
1828 sigset_t ksigmask, sigsaved;
1829 struct compat_timespec ts;
1830 struct timespec end_time, *to = NULL;
1831 int ret;
1832
1833 if (tsp) {
1834 if (copy_from_user(&ts, tsp, sizeof(ts)))
1835 return -EFAULT;
1836
1837 to = &end_time;
1838 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1839 return -EINVAL;
1840 }
1841
1842 if (sigmask) {
1843 if (sigsetsize != sizeof(compat_sigset_t))
1844 return -EINVAL;
1845 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1846 return -EFAULT;
1847 sigset_from_compat(&ksigmask, &ss32);
1848
1849 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1850 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1851 }
1852
1853 ret = do_sys_poll(ufds, nfds, to);
1854
1855 /* We can restart this syscall, usually */
1856 if (ret == -EINTR) {
1857 /*
1858 * Don't restore the signal mask yet. Let do_signal() deliver
1859 * the signal on the way back to userspace, before the signal
1860 * mask is restored.
1861 */
1862 if (sigmask) {
1863 memcpy(&current->saved_sigmask, &sigsaved,
1864 sizeof(sigsaved));
1865 set_restore_sigmask();
1866 }
1867 ret = -ERESTARTNOHAND;
1868 } else if (sigmask)
1869 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1870
1871 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1872
1873 return ret;
1874 }
1875 #endif /* HAVE_SET_RESTORE_SIGMASK */
1876
1877 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1878 /* Stuff for NFS server syscalls... */
1879 struct compat_nfsctl_svc {
1880 u16 svc32_port;
1881 s32 svc32_nthreads;
1882 };
1883
1884 struct compat_nfsctl_client {
1885 s8 cl32_ident[NFSCLNT_IDMAX+1];
1886 s32 cl32_naddr;
1887 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1888 s32 cl32_fhkeytype;
1889 s32 cl32_fhkeylen;
1890 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1891 };
1892
1893 struct compat_nfsctl_export {
1894 char ex32_client[NFSCLNT_IDMAX+1];
1895 char ex32_path[NFS_MAXPATHLEN+1];
1896 compat_dev_t ex32_dev;
1897 compat_ino_t ex32_ino;
1898 compat_int_t ex32_flags;
1899 __compat_uid_t ex32_anon_uid;
1900 __compat_gid_t ex32_anon_gid;
1901 };
1902
1903 struct compat_nfsctl_fdparm {
1904 struct sockaddr gd32_addr;
1905 s8 gd32_path[NFS_MAXPATHLEN+1];
1906 compat_int_t gd32_version;
1907 };
1908
1909 struct compat_nfsctl_fsparm {
1910 struct sockaddr gd32_addr;
1911 s8 gd32_path[NFS_MAXPATHLEN+1];
1912 compat_int_t gd32_maxlen;
1913 };
1914
1915 struct compat_nfsctl_arg {
1916 compat_int_t ca32_version; /* safeguard */
1917 union {
1918 struct compat_nfsctl_svc u32_svc;
1919 struct compat_nfsctl_client u32_client;
1920 struct compat_nfsctl_export u32_export;
1921 struct compat_nfsctl_fdparm u32_getfd;
1922 struct compat_nfsctl_fsparm u32_getfs;
1923 } u;
1924 #define ca32_svc u.u32_svc
1925 #define ca32_client u.u32_client
1926 #define ca32_export u.u32_export
1927 #define ca32_getfd u.u32_getfd
1928 #define ca32_getfs u.u32_getfs
1929 };
1930
1931 union compat_nfsctl_res {
1932 __u8 cr32_getfh[NFS_FHSIZE];
1933 struct knfsd_fh cr32_getfs;
1934 };
1935
1936 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1937 struct compat_nfsctl_arg __user *arg)
1938 {
1939 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1940 get_user(karg->ca_version, &arg->ca32_version) ||
1941 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1942 __get_user(karg->ca_svc.svc_nthreads,
1943 &arg->ca32_svc.svc32_nthreads))
1944 return -EFAULT;
1945 return 0;
1946 }
1947
1948 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1949 struct compat_nfsctl_arg __user *arg)
1950 {
1951 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1952 sizeof(arg->ca32_client)) ||
1953 get_user(karg->ca_version, &arg->ca32_version) ||
1954 __copy_from_user(&karg->ca_client.cl_ident[0],
1955 &arg->ca32_client.cl32_ident[0],
1956 NFSCLNT_IDMAX) ||
1957 __get_user(karg->ca_client.cl_naddr,
1958 &arg->ca32_client.cl32_naddr) ||
1959 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1960 &arg->ca32_client.cl32_addrlist[0],
1961 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1962 __get_user(karg->ca_client.cl_fhkeytype,
1963 &arg->ca32_client.cl32_fhkeytype) ||
1964 __get_user(karg->ca_client.cl_fhkeylen,
1965 &arg->ca32_client.cl32_fhkeylen) ||
1966 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1967 &arg->ca32_client.cl32_fhkey[0],
1968 NFSCLNT_KEYMAX))
1969 return -EFAULT;
1970
1971 return 0;
1972 }
1973
1974 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1975 struct compat_nfsctl_arg __user *arg)
1976 {
1977 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1978 sizeof(arg->ca32_export)) ||
1979 get_user(karg->ca_version, &arg->ca32_version) ||
1980 __copy_from_user(&karg->ca_export.ex_client[0],
1981 &arg->ca32_export.ex32_client[0],
1982 NFSCLNT_IDMAX) ||
1983 __copy_from_user(&karg->ca_export.ex_path[0],
1984 &arg->ca32_export.ex32_path[0],
1985 NFS_MAXPATHLEN) ||
1986 __get_user(karg->ca_export.ex_dev,
1987 &arg->ca32_export.ex32_dev) ||
1988 __get_user(karg->ca_export.ex_ino,
1989 &arg->ca32_export.ex32_ino) ||
1990 __get_user(karg->ca_export.ex_flags,
1991 &arg->ca32_export.ex32_flags) ||
1992 __get_user(karg->ca_export.ex_anon_uid,
1993 &arg->ca32_export.ex32_anon_uid) ||
1994 __get_user(karg->ca_export.ex_anon_gid,
1995 &arg->ca32_export.ex32_anon_gid))
1996 return -EFAULT;
1997 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1998 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1999
2000 return 0;
2001 }
2002
2003 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2004 struct compat_nfsctl_arg __user *arg)
2005 {
2006 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2007 sizeof(arg->ca32_getfd)) ||
2008 get_user(karg->ca_version, &arg->ca32_version) ||
2009 __copy_from_user(&karg->ca_getfd.gd_addr,
2010 &arg->ca32_getfd.gd32_addr,
2011 (sizeof(struct sockaddr))) ||
2012 __copy_from_user(&karg->ca_getfd.gd_path,
2013 &arg->ca32_getfd.gd32_path,
2014 (NFS_MAXPATHLEN+1)) ||
2015 __get_user(karg->ca_getfd.gd_version,
2016 &arg->ca32_getfd.gd32_version))
2017 return -EFAULT;
2018
2019 return 0;
2020 }
2021
2022 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2023 struct compat_nfsctl_arg __user *arg)
2024 {
2025 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2026 get_user(karg->ca_version, &arg->ca32_version) ||
2027 __copy_from_user(&karg->ca_getfs.gd_addr,
2028 &arg->ca32_getfs.gd32_addr,
2029 (sizeof(struct sockaddr))) ||
2030 __copy_from_user(&karg->ca_getfs.gd_path,
2031 &arg->ca32_getfs.gd32_path,
2032 (NFS_MAXPATHLEN+1)) ||
2033 __get_user(karg->ca_getfs.gd_maxlen,
2034 &arg->ca32_getfs.gd32_maxlen))
2035 return -EFAULT;
2036
2037 return 0;
2038 }
2039
2040 /* This really doesn't need translations, we are only passing
2041 * back a union which contains opaque nfs file handle data.
2042 */
2043 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2044 union compat_nfsctl_res __user *res)
2045 {
2046 int err;
2047
2048 err = copy_to_user(res, kres, sizeof(*res));
2049
2050 return (err) ? -EFAULT : 0;
2051 }
2052
2053 asmlinkage long compat_sys_nfsservctl(int cmd,
2054 struct compat_nfsctl_arg __user *arg,
2055 union compat_nfsctl_res __user *res)
2056 {
2057 struct nfsctl_arg *karg;
2058 union nfsctl_res *kres;
2059 mm_segment_t oldfs;
2060 int err;
2061
2062 karg = kmalloc(sizeof(*karg), GFP_USER);
2063 kres = kmalloc(sizeof(*kres), GFP_USER);
2064 if(!karg || !kres) {
2065 err = -ENOMEM;
2066 goto done;
2067 }
2068
2069 switch(cmd) {
2070 case NFSCTL_SVC:
2071 err = compat_nfs_svc_trans(karg, arg);
2072 break;
2073
2074 case NFSCTL_ADDCLIENT:
2075 err = compat_nfs_clnt_trans(karg, arg);
2076 break;
2077
2078 case NFSCTL_DELCLIENT:
2079 err = compat_nfs_clnt_trans(karg, arg);
2080 break;
2081
2082 case NFSCTL_EXPORT:
2083 case NFSCTL_UNEXPORT:
2084 err = compat_nfs_exp_trans(karg, arg);
2085 break;
2086
2087 case NFSCTL_GETFD:
2088 err = compat_nfs_getfd_trans(karg, arg);
2089 break;
2090
2091 case NFSCTL_GETFS:
2092 err = compat_nfs_getfs_trans(karg, arg);
2093 break;
2094
2095 default:
2096 err = -EINVAL;
2097 break;
2098 }
2099
2100 if (err)
2101 goto done;
2102
2103 oldfs = get_fs();
2104 set_fs(KERNEL_DS);
2105 /* The __user pointer casts are valid because of the set_fs() */
2106 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2107 set_fs(oldfs);
2108
2109 if (err)
2110 goto done;
2111
2112 if((cmd == NFSCTL_GETFD) ||
2113 (cmd == NFSCTL_GETFS))
2114 err = compat_nfs_getfh_res_trans(kres, res);
2115
2116 done:
2117 kfree(karg);
2118 kfree(kres);
2119 return err;
2120 }
2121 #else /* !NFSD */
2122 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2123 {
2124 return sys_ni_syscall();
2125 }
2126 #endif
2127
2128 #ifdef CONFIG_EPOLL
2129
2130 #ifdef HAVE_SET_RESTORE_SIGMASK
2131 asmlinkage long compat_sys_epoll_pwait(int epfd,
2132 struct compat_epoll_event __user *events,
2133 int maxevents, int timeout,
2134 const compat_sigset_t __user *sigmask,
2135 compat_size_t sigsetsize)
2136 {
2137 long err;
2138 compat_sigset_t csigmask;
2139 sigset_t ksigmask, sigsaved;
2140
2141 /*
2142 * If the caller wants a certain signal mask to be set during the wait,
2143 * we apply it here.
2144 */
2145 if (sigmask) {
2146 if (sigsetsize != sizeof(compat_sigset_t))
2147 return -EINVAL;
2148 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2149 return -EFAULT;
2150 sigset_from_compat(&ksigmask, &csigmask);
2151 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2152 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2153 }
2154
2155 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2156
2157 /*
2158 * If we changed the signal mask, we need to restore the original one.
2159 * In case we've got a signal while waiting, we do not restore the
2160 * signal mask yet, and we allow do_signal() to deliver the signal on
2161 * the way back to userspace, before the signal mask is restored.
2162 */
2163 if (sigmask) {
2164 if (err == -EINTR) {
2165 memcpy(&current->saved_sigmask, &sigsaved,
2166 sizeof(sigsaved));
2167 set_restore_sigmask();
2168 } else
2169 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2170 }
2171
2172 return err;
2173 }
2174 #endif /* HAVE_SET_RESTORE_SIGMASK */
2175
2176 #endif /* CONFIG_EPOLL */
2177
2178 #ifdef CONFIG_SIGNALFD
2179
2180 asmlinkage long compat_sys_signalfd4(int ufd,
2181 const compat_sigset_t __user *sigmask,
2182 compat_size_t sigsetsize, int flags)
2183 {
2184 compat_sigset_t ss32;
2185 sigset_t tmp;
2186 sigset_t __user *ksigmask;
2187
2188 if (sigsetsize != sizeof(compat_sigset_t))
2189 return -EINVAL;
2190 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2191 return -EFAULT;
2192 sigset_from_compat(&tmp, &ss32);
2193 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2194 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2195 return -EFAULT;
2196
2197 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2198 }
2199
2200 asmlinkage long compat_sys_signalfd(int ufd,
2201 const compat_sigset_t __user *sigmask,
2202 compat_size_t sigsetsize)
2203 {
2204 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2205 }
2206 #endif /* CONFIG_SIGNALFD */
2207
2208 #ifdef CONFIG_TIMERFD
2209
2210 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2211 const struct compat_itimerspec __user *utmr,
2212 struct compat_itimerspec __user *otmr)
2213 {
2214 int error;
2215 struct itimerspec t;
2216 struct itimerspec __user *ut;
2217
2218 if (get_compat_itimerspec(&t, utmr))
2219 return -EFAULT;
2220 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2221 if (copy_to_user(&ut[0], &t, sizeof(t)))
2222 return -EFAULT;
2223 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2224 if (!error && otmr)
2225 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2226 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2227
2228 return error;
2229 }
2230
2231 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2232 struct compat_itimerspec __user *otmr)
2233 {
2234 int error;
2235 struct itimerspec t;
2236 struct itimerspec __user *ut;
2237
2238 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2239 error = sys_timerfd_gettime(ufd, ut);
2240 if (!error)
2241 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2242 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2243
2244 return error;
2245 }
2246
2247 #endif /* CONFIG_TIMERFD */
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