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Separate out common fstatat code into vfs_fstatat
[deliverable/linux.git] / fs / compat.c
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/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 #include <linux/fs_struct.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/mmu_context.h>
58 #include <asm/ioctls.h>
59 #include "internal.h"
60
61 int compat_log = 1;
62
63 int compat_printk(const char *fmt, ...)
64 {
65 va_list ap;
66 int ret;
67 if (!compat_log)
68 return 0;
69 va_start(ap, fmt);
70 ret = vprintk(fmt, ap);
71 va_end(ap);
72 return ret;
73 }
74
75 #include "read_write.h"
76
77 /*
78 * Not all architectures have sys_utime, so implement this in terms
79 * of sys_utimes.
80 */
81 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
82 {
83 struct timespec tv[2];
84
85 if (t) {
86 if (get_user(tv[0].tv_sec, &t->actime) ||
87 get_user(tv[1].tv_sec, &t->modtime))
88 return -EFAULT;
89 tv[0].tv_nsec = 0;
90 tv[1].tv_nsec = 0;
91 }
92 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
93 }
94
95 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
96 {
97 struct timespec tv[2];
98
99 if (t) {
100 if (get_compat_timespec(&tv[0], &t[0]) ||
101 get_compat_timespec(&tv[1], &t[1]))
102 return -EFAULT;
103
104 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
105 && tv[0].tv_sec != 0)
106 return -EINVAL;
107 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
108 && tv[1].tv_sec != 0)
109 return -EINVAL;
110
111 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
112 return 0;
113 }
114 return do_utimes(dfd, filename, t ? tv : NULL, flags);
115 }
116
117 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
118 {
119 struct timespec tv[2];
120
121 if (t) {
122 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
123 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
124 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
125 get_user(tv[1].tv_nsec, &t[1].tv_usec))
126 return -EFAULT;
127 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
128 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
129 return -EINVAL;
130 tv[0].tv_nsec *= 1000;
131 tv[1].tv_nsec *= 1000;
132 }
133 return do_utimes(dfd, filename, t ? tv : NULL, 0);
134 }
135
136 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
137 {
138 return compat_sys_futimesat(AT_FDCWD, filename, t);
139 }
140
141 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
142 {
143 compat_ino_t ino = stat->ino;
144 typeof(ubuf->st_uid) uid = 0;
145 typeof(ubuf->st_gid) gid = 0;
146 int err;
147
148 SET_UID(uid, stat->uid);
149 SET_GID(gid, stat->gid);
150
151 if ((u64) stat->size > MAX_NON_LFS ||
152 !old_valid_dev(stat->dev) ||
153 !old_valid_dev(stat->rdev))
154 return -EOVERFLOW;
155 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
156 return -EOVERFLOW;
157
158 if (clear_user(ubuf, sizeof(*ubuf)))
159 return -EFAULT;
160
161 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
162 err |= __put_user(ino, &ubuf->st_ino);
163 err |= __put_user(stat->mode, &ubuf->st_mode);
164 err |= __put_user(stat->nlink, &ubuf->st_nlink);
165 err |= __put_user(uid, &ubuf->st_uid);
166 err |= __put_user(gid, &ubuf->st_gid);
167 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
168 err |= __put_user(stat->size, &ubuf->st_size);
169 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
170 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
171 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
172 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
173 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
174 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
175 err |= __put_user(stat->blksize, &ubuf->st_blksize);
176 err |= __put_user(stat->blocks, &ubuf->st_blocks);
177 return err;
178 }
179
180 asmlinkage long compat_sys_newstat(char __user * filename,
181 struct compat_stat __user *statbuf)
182 {
183 struct kstat stat;
184 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
185
186 if (!error)
187 error = cp_compat_stat(&stat, statbuf);
188 return error;
189 }
190
191 asmlinkage long compat_sys_newlstat(char __user * filename,
192 struct compat_stat __user *statbuf)
193 {
194 struct kstat stat;
195 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
196
197 if (!error)
198 error = cp_compat_stat(&stat, statbuf);
199 return error;
200 }
201
202 #ifndef __ARCH_WANT_STAT64
203 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
204 struct compat_stat __user *statbuf, int flag)
205 {
206 struct kstat stat;
207 int error;
208
209 error = vfs_fstatat(dfd, filename, &stat, flag);
210 if (error)
211 return error;
212 return cp_compat_stat(&stat, statbuf);
213 }
214 #endif
215
216 asmlinkage long compat_sys_newfstat(unsigned int fd,
217 struct compat_stat __user * statbuf)
218 {
219 struct kstat stat;
220 int error = vfs_fstat(fd, &stat);
221
222 if (!error)
223 error = cp_compat_stat(&stat, statbuf);
224 return error;
225 }
226
227 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
228 {
229
230 if (sizeof ubuf->f_blocks == 4) {
231 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
232 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
233 return -EOVERFLOW;
234 /* f_files and f_ffree may be -1; it's okay
235 * to stuff that into 32 bits */
236 if (kbuf->f_files != 0xffffffffffffffffULL
237 && (kbuf->f_files & 0xffffffff00000000ULL))
238 return -EOVERFLOW;
239 if (kbuf->f_ffree != 0xffffffffffffffffULL
240 && (kbuf->f_ffree & 0xffffffff00000000ULL))
241 return -EOVERFLOW;
242 }
243 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
244 __put_user(kbuf->f_type, &ubuf->f_type) ||
245 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
246 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
247 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
248 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
249 __put_user(kbuf->f_files, &ubuf->f_files) ||
250 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
251 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
252 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
253 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
254 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
255 __put_user(0, &ubuf->f_spare[0]) ||
256 __put_user(0, &ubuf->f_spare[1]) ||
257 __put_user(0, &ubuf->f_spare[2]) ||
258 __put_user(0, &ubuf->f_spare[3]) ||
259 __put_user(0, &ubuf->f_spare[4]))
260 return -EFAULT;
261 return 0;
262 }
263
264 /*
265 * The following statfs calls are copies of code from fs/open.c and
266 * should be checked against those from time to time
267 */
268 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
269 {
270 struct path path;
271 int error;
272
273 error = user_path(pathname, &path);
274 if (!error) {
275 struct kstatfs tmp;
276 error = vfs_statfs(path.dentry, &tmp);
277 if (!error)
278 error = put_compat_statfs(buf, &tmp);
279 path_put(&path);
280 }
281 return error;
282 }
283
284 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
285 {
286 struct file * file;
287 struct kstatfs tmp;
288 int error;
289
290 error = -EBADF;
291 file = fget(fd);
292 if (!file)
293 goto out;
294 error = vfs_statfs(file->f_path.dentry, &tmp);
295 if (!error)
296 error = put_compat_statfs(buf, &tmp);
297 fput(file);
298 out:
299 return error;
300 }
301
302 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
303 {
304 if (sizeof ubuf->f_blocks == 4) {
305 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
306 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
307 return -EOVERFLOW;
308 /* f_files and f_ffree may be -1; it's okay
309 * to stuff that into 32 bits */
310 if (kbuf->f_files != 0xffffffffffffffffULL
311 && (kbuf->f_files & 0xffffffff00000000ULL))
312 return -EOVERFLOW;
313 if (kbuf->f_ffree != 0xffffffffffffffffULL
314 && (kbuf->f_ffree & 0xffffffff00000000ULL))
315 return -EOVERFLOW;
316 }
317 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
318 __put_user(kbuf->f_type, &ubuf->f_type) ||
319 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
320 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
321 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
322 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
323 __put_user(kbuf->f_files, &ubuf->f_files) ||
324 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
325 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
326 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
327 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
328 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
329 return -EFAULT;
330 return 0;
331 }
332
333 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
334 {
335 struct path path;
336 int error;
337
338 if (sz != sizeof(*buf))
339 return -EINVAL;
340
341 error = user_path(pathname, &path);
342 if (!error) {
343 struct kstatfs tmp;
344 error = vfs_statfs(path.dentry, &tmp);
345 if (!error)
346 error = put_compat_statfs64(buf, &tmp);
347 path_put(&path);
348 }
349 return error;
350 }
351
352 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
353 {
354 struct file * file;
355 struct kstatfs tmp;
356 int error;
357
358 if (sz != sizeof(*buf))
359 return -EINVAL;
360
361 error = -EBADF;
362 file = fget(fd);
363 if (!file)
364 goto out;
365 error = vfs_statfs(file->f_path.dentry, &tmp);
366 if (!error)
367 error = put_compat_statfs64(buf, &tmp);
368 fput(file);
369 out:
370 return error;
371 }
372
373 /*
374 * This is a copy of sys_ustat, just dealing with a structure layout.
375 * Given how simple this syscall is that apporach is more maintainable
376 * than the various conversion hacks.
377 */
378 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
379 {
380 struct super_block *sb;
381 struct compat_ustat tmp;
382 struct kstatfs sbuf;
383 int err;
384
385 sb = user_get_super(new_decode_dev(dev));
386 if (!sb)
387 return -EINVAL;
388 err = vfs_statfs(sb->s_root, &sbuf);
389 drop_super(sb);
390 if (err)
391 return err;
392
393 memset(&tmp, 0, sizeof(struct compat_ustat));
394 tmp.f_tfree = sbuf.f_bfree;
395 tmp.f_tinode = sbuf.f_ffree;
396 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
397 return -EFAULT;
398 return 0;
399 }
400
401 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
402 {
403 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
404 __get_user(kfl->l_type, &ufl->l_type) ||
405 __get_user(kfl->l_whence, &ufl->l_whence) ||
406 __get_user(kfl->l_start, &ufl->l_start) ||
407 __get_user(kfl->l_len, &ufl->l_len) ||
408 __get_user(kfl->l_pid, &ufl->l_pid))
409 return -EFAULT;
410 return 0;
411 }
412
413 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
414 {
415 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
416 __put_user(kfl->l_type, &ufl->l_type) ||
417 __put_user(kfl->l_whence, &ufl->l_whence) ||
418 __put_user(kfl->l_start, &ufl->l_start) ||
419 __put_user(kfl->l_len, &ufl->l_len) ||
420 __put_user(kfl->l_pid, &ufl->l_pid))
421 return -EFAULT;
422 return 0;
423 }
424
425 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
426 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
427 {
428 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
429 __get_user(kfl->l_type, &ufl->l_type) ||
430 __get_user(kfl->l_whence, &ufl->l_whence) ||
431 __get_user(kfl->l_start, &ufl->l_start) ||
432 __get_user(kfl->l_len, &ufl->l_len) ||
433 __get_user(kfl->l_pid, &ufl->l_pid))
434 return -EFAULT;
435 return 0;
436 }
437 #endif
438
439 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
440 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
441 {
442 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
443 __put_user(kfl->l_type, &ufl->l_type) ||
444 __put_user(kfl->l_whence, &ufl->l_whence) ||
445 __put_user(kfl->l_start, &ufl->l_start) ||
446 __put_user(kfl->l_len, &ufl->l_len) ||
447 __put_user(kfl->l_pid, &ufl->l_pid))
448 return -EFAULT;
449 return 0;
450 }
451 #endif
452
453 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
454 unsigned long arg)
455 {
456 mm_segment_t old_fs;
457 struct flock f;
458 long ret;
459
460 switch (cmd) {
461 case F_GETLK:
462 case F_SETLK:
463 case F_SETLKW:
464 ret = get_compat_flock(&f, compat_ptr(arg));
465 if (ret != 0)
466 break;
467 old_fs = get_fs();
468 set_fs(KERNEL_DS);
469 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
470 set_fs(old_fs);
471 if (cmd == F_GETLK && ret == 0) {
472 /* GETLK was successfule and we need to return the data...
473 * but it needs to fit in the compat structure.
474 * l_start shouldn't be too big, unless the original
475 * start + end is greater than COMPAT_OFF_T_MAX, in which
476 * case the app was asking for trouble, so we return
477 * -EOVERFLOW in that case.
478 * l_len could be too big, in which case we just truncate it,
479 * and only allow the app to see that part of the conflicting
480 * lock that might make sense to it anyway
481 */
482
483 if (f.l_start > COMPAT_OFF_T_MAX)
484 ret = -EOVERFLOW;
485 if (f.l_len > COMPAT_OFF_T_MAX)
486 f.l_len = COMPAT_OFF_T_MAX;
487 if (ret == 0)
488 ret = put_compat_flock(&f, compat_ptr(arg));
489 }
490 break;
491
492 case F_GETLK64:
493 case F_SETLK64:
494 case F_SETLKW64:
495 ret = get_compat_flock64(&f, compat_ptr(arg));
496 if (ret != 0)
497 break;
498 old_fs = get_fs();
499 set_fs(KERNEL_DS);
500 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
501 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
502 (unsigned long)&f);
503 set_fs(old_fs);
504 if (cmd == F_GETLK64 && ret == 0) {
505 /* need to return lock information - see above for commentary */
506 if (f.l_start > COMPAT_LOFF_T_MAX)
507 ret = -EOVERFLOW;
508 if (f.l_len > COMPAT_LOFF_T_MAX)
509 f.l_len = COMPAT_LOFF_T_MAX;
510 if (ret == 0)
511 ret = put_compat_flock64(&f, compat_ptr(arg));
512 }
513 break;
514
515 default:
516 ret = sys_fcntl(fd, cmd, arg);
517 break;
518 }
519 return ret;
520 }
521
522 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
523 unsigned long arg)
524 {
525 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
526 return -EINVAL;
527 return compat_sys_fcntl64(fd, cmd, arg);
528 }
529
530 asmlinkage long
531 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
532 {
533 long ret;
534 aio_context_t ctx64;
535
536 mm_segment_t oldfs = get_fs();
537 if (unlikely(get_user(ctx64, ctx32p)))
538 return -EFAULT;
539
540 set_fs(KERNEL_DS);
541 /* The __user pointer cast is valid because of the set_fs() */
542 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
543 set_fs(oldfs);
544 /* truncating is ok because it's a user address */
545 if (!ret)
546 ret = put_user((u32) ctx64, ctx32p);
547 return ret;
548 }
549
550 asmlinkage long
551 compat_sys_io_getevents(aio_context_t ctx_id,
552 unsigned long min_nr,
553 unsigned long nr,
554 struct io_event __user *events,
555 struct compat_timespec __user *timeout)
556 {
557 long ret;
558 struct timespec t;
559 struct timespec __user *ut = NULL;
560
561 ret = -EFAULT;
562 if (unlikely(!access_ok(VERIFY_WRITE, events,
563 nr * sizeof(struct io_event))))
564 goto out;
565 if (timeout) {
566 if (get_compat_timespec(&t, timeout))
567 goto out;
568
569 ut = compat_alloc_user_space(sizeof(*ut));
570 if (copy_to_user(ut, &t, sizeof(t)) )
571 goto out;
572 }
573 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
574 out:
575 return ret;
576 }
577
578 static inline long
579 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
580 {
581 compat_uptr_t uptr;
582 int i;
583
584 for (i = 0; i < nr; ++i) {
585 if (get_user(uptr, ptr32 + i))
586 return -EFAULT;
587 if (put_user(compat_ptr(uptr), ptr64 + i))
588 return -EFAULT;
589 }
590 return 0;
591 }
592
593 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
594
595 asmlinkage long
596 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
597 {
598 struct iocb __user * __user *iocb64;
599 long ret;
600
601 if (unlikely(nr < 0))
602 return -EINVAL;
603
604 if (nr > MAX_AIO_SUBMITS)
605 nr = MAX_AIO_SUBMITS;
606
607 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
608 ret = copy_iocb(nr, iocb, iocb64);
609 if (!ret)
610 ret = sys_io_submit(ctx_id, nr, iocb64);
611 return ret;
612 }
613
614 struct compat_ncp_mount_data {
615 compat_int_t version;
616 compat_uint_t ncp_fd;
617 __compat_uid_t mounted_uid;
618 compat_pid_t wdog_pid;
619 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
620 compat_uint_t time_out;
621 compat_uint_t retry_count;
622 compat_uint_t flags;
623 __compat_uid_t uid;
624 __compat_gid_t gid;
625 compat_mode_t file_mode;
626 compat_mode_t dir_mode;
627 };
628
629 struct compat_ncp_mount_data_v4 {
630 compat_int_t version;
631 compat_ulong_t flags;
632 compat_ulong_t mounted_uid;
633 compat_long_t wdog_pid;
634 compat_uint_t ncp_fd;
635 compat_uint_t time_out;
636 compat_uint_t retry_count;
637 compat_ulong_t uid;
638 compat_ulong_t gid;
639 compat_ulong_t file_mode;
640 compat_ulong_t dir_mode;
641 };
642
643 static void *do_ncp_super_data_conv(void *raw_data)
644 {
645 int version = *(unsigned int *)raw_data;
646
647 if (version == 3) {
648 struct compat_ncp_mount_data *c_n = raw_data;
649 struct ncp_mount_data *n = raw_data;
650
651 n->dir_mode = c_n->dir_mode;
652 n->file_mode = c_n->file_mode;
653 n->gid = c_n->gid;
654 n->uid = c_n->uid;
655 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
656 n->wdog_pid = c_n->wdog_pid;
657 n->mounted_uid = c_n->mounted_uid;
658 } else if (version == 4) {
659 struct compat_ncp_mount_data_v4 *c_n = raw_data;
660 struct ncp_mount_data_v4 *n = raw_data;
661
662 n->dir_mode = c_n->dir_mode;
663 n->file_mode = c_n->file_mode;
664 n->gid = c_n->gid;
665 n->uid = c_n->uid;
666 n->retry_count = c_n->retry_count;
667 n->time_out = c_n->time_out;
668 n->ncp_fd = c_n->ncp_fd;
669 n->wdog_pid = c_n->wdog_pid;
670 n->mounted_uid = c_n->mounted_uid;
671 n->flags = c_n->flags;
672 } else if (version != 5) {
673 return NULL;
674 }
675
676 return raw_data;
677 }
678
679 struct compat_smb_mount_data {
680 compat_int_t version;
681 __compat_uid_t mounted_uid;
682 __compat_uid_t uid;
683 __compat_gid_t gid;
684 compat_mode_t file_mode;
685 compat_mode_t dir_mode;
686 };
687
688 static void *do_smb_super_data_conv(void *raw_data)
689 {
690 struct smb_mount_data *s = raw_data;
691 struct compat_smb_mount_data *c_s = raw_data;
692
693 if (c_s->version != SMB_MOUNT_OLDVERSION)
694 goto out;
695 s->dir_mode = c_s->dir_mode;
696 s->file_mode = c_s->file_mode;
697 s->gid = c_s->gid;
698 s->uid = c_s->uid;
699 s->mounted_uid = c_s->mounted_uid;
700 out:
701 return raw_data;
702 }
703
704 struct compat_nfs_string {
705 compat_uint_t len;
706 compat_uptr_t data;
707 };
708
709 static inline void compat_nfs_string(struct nfs_string *dst,
710 struct compat_nfs_string *src)
711 {
712 dst->data = compat_ptr(src->data);
713 dst->len = src->len;
714 }
715
716 struct compat_nfs4_mount_data_v1 {
717 compat_int_t version;
718 compat_int_t flags;
719 compat_int_t rsize;
720 compat_int_t wsize;
721 compat_int_t timeo;
722 compat_int_t retrans;
723 compat_int_t acregmin;
724 compat_int_t acregmax;
725 compat_int_t acdirmin;
726 compat_int_t acdirmax;
727 struct compat_nfs_string client_addr;
728 struct compat_nfs_string mnt_path;
729 struct compat_nfs_string hostname;
730 compat_uint_t host_addrlen;
731 compat_uptr_t host_addr;
732 compat_int_t proto;
733 compat_int_t auth_flavourlen;
734 compat_uptr_t auth_flavours;
735 };
736
737 static int do_nfs4_super_data_conv(void *raw_data)
738 {
739 int version = *(compat_uint_t *) raw_data;
740
741 if (version == 1) {
742 struct compat_nfs4_mount_data_v1 *raw = raw_data;
743 struct nfs4_mount_data *real = raw_data;
744
745 /* copy the fields backwards */
746 real->auth_flavours = compat_ptr(raw->auth_flavours);
747 real->auth_flavourlen = raw->auth_flavourlen;
748 real->proto = raw->proto;
749 real->host_addr = compat_ptr(raw->host_addr);
750 real->host_addrlen = raw->host_addrlen;
751 compat_nfs_string(&real->hostname, &raw->hostname);
752 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
753 compat_nfs_string(&real->client_addr, &raw->client_addr);
754 real->acdirmax = raw->acdirmax;
755 real->acdirmin = raw->acdirmin;
756 real->acregmax = raw->acregmax;
757 real->acregmin = raw->acregmin;
758 real->retrans = raw->retrans;
759 real->timeo = raw->timeo;
760 real->wsize = raw->wsize;
761 real->rsize = raw->rsize;
762 real->flags = raw->flags;
763 real->version = raw->version;
764 }
765
766 return 0;
767 }
768
769 #define SMBFS_NAME "smbfs"
770 #define NCPFS_NAME "ncpfs"
771 #define NFS4_NAME "nfs4"
772
773 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
774 char __user * type, unsigned long flags,
775 void __user * data)
776 {
777 unsigned long type_page;
778 unsigned long data_page;
779 unsigned long dev_page;
780 char *dir_page;
781 int retval;
782
783 retval = copy_mount_options (type, &type_page);
784 if (retval < 0)
785 goto out;
786
787 dir_page = getname(dir_name);
788 retval = PTR_ERR(dir_page);
789 if (IS_ERR(dir_page))
790 goto out1;
791
792 retval = copy_mount_options (dev_name, &dev_page);
793 if (retval < 0)
794 goto out2;
795
796 retval = copy_mount_options (data, &data_page);
797 if (retval < 0)
798 goto out3;
799
800 retval = -EINVAL;
801
802 if (type_page && data_page) {
803 if (!strcmp((char *)type_page, SMBFS_NAME)) {
804 do_smb_super_data_conv((void *)data_page);
805 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
806 do_ncp_super_data_conv((void *)data_page);
807 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
808 if (do_nfs4_super_data_conv((void *) data_page))
809 goto out4;
810 }
811 }
812
813 lock_kernel();
814 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
815 flags, (void*)data_page);
816 unlock_kernel();
817
818 out4:
819 free_page(data_page);
820 out3:
821 free_page(dev_page);
822 out2:
823 putname(dir_page);
824 out1:
825 free_page(type_page);
826 out:
827 return retval;
828 }
829
830 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
831
832 struct compat_old_linux_dirent {
833 compat_ulong_t d_ino;
834 compat_ulong_t d_offset;
835 unsigned short d_namlen;
836 char d_name[1];
837 };
838
839 struct compat_readdir_callback {
840 struct compat_old_linux_dirent __user *dirent;
841 int result;
842 };
843
844 static int compat_fillonedir(void *__buf, const char *name, int namlen,
845 loff_t offset, u64 ino, unsigned int d_type)
846 {
847 struct compat_readdir_callback *buf = __buf;
848 struct compat_old_linux_dirent __user *dirent;
849 compat_ulong_t d_ino;
850
851 if (buf->result)
852 return -EINVAL;
853 d_ino = ino;
854 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
855 buf->result = -EOVERFLOW;
856 return -EOVERFLOW;
857 }
858 buf->result++;
859 dirent = buf->dirent;
860 if (!access_ok(VERIFY_WRITE, dirent,
861 (unsigned long)(dirent->d_name + namlen + 1) -
862 (unsigned long)dirent))
863 goto efault;
864 if ( __put_user(d_ino, &dirent->d_ino) ||
865 __put_user(offset, &dirent->d_offset) ||
866 __put_user(namlen, &dirent->d_namlen) ||
867 __copy_to_user(dirent->d_name, name, namlen) ||
868 __put_user(0, dirent->d_name + namlen))
869 goto efault;
870 return 0;
871 efault:
872 buf->result = -EFAULT;
873 return -EFAULT;
874 }
875
876 asmlinkage long compat_sys_old_readdir(unsigned int fd,
877 struct compat_old_linux_dirent __user *dirent, unsigned int count)
878 {
879 int error;
880 struct file *file;
881 struct compat_readdir_callback buf;
882
883 error = -EBADF;
884 file = fget(fd);
885 if (!file)
886 goto out;
887
888 buf.result = 0;
889 buf.dirent = dirent;
890
891 error = vfs_readdir(file, compat_fillonedir, &buf);
892 if (buf.result)
893 error = buf.result;
894
895 fput(file);
896 out:
897 return error;
898 }
899
900 struct compat_linux_dirent {
901 compat_ulong_t d_ino;
902 compat_ulong_t d_off;
903 unsigned short d_reclen;
904 char d_name[1];
905 };
906
907 struct compat_getdents_callback {
908 struct compat_linux_dirent __user *current_dir;
909 struct compat_linux_dirent __user *previous;
910 int count;
911 int error;
912 };
913
914 static int compat_filldir(void *__buf, const char *name, int namlen,
915 loff_t offset, u64 ino, unsigned int d_type)
916 {
917 struct compat_linux_dirent __user * dirent;
918 struct compat_getdents_callback *buf = __buf;
919 compat_ulong_t d_ino;
920 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
921
922 buf->error = -EINVAL; /* only used if we fail.. */
923 if (reclen > buf->count)
924 return -EINVAL;
925 d_ino = ino;
926 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
927 buf->error = -EOVERFLOW;
928 return -EOVERFLOW;
929 }
930 dirent = buf->previous;
931 if (dirent) {
932 if (__put_user(offset, &dirent->d_off))
933 goto efault;
934 }
935 dirent = buf->current_dir;
936 if (__put_user(d_ino, &dirent->d_ino))
937 goto efault;
938 if (__put_user(reclen, &dirent->d_reclen))
939 goto efault;
940 if (copy_to_user(dirent->d_name, name, namlen))
941 goto efault;
942 if (__put_user(0, dirent->d_name + namlen))
943 goto efault;
944 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
945 goto efault;
946 buf->previous = dirent;
947 dirent = (void __user *)dirent + reclen;
948 buf->current_dir = dirent;
949 buf->count -= reclen;
950 return 0;
951 efault:
952 buf->error = -EFAULT;
953 return -EFAULT;
954 }
955
956 asmlinkage long compat_sys_getdents(unsigned int fd,
957 struct compat_linux_dirent __user *dirent, unsigned int count)
958 {
959 struct file * file;
960 struct compat_linux_dirent __user * lastdirent;
961 struct compat_getdents_callback buf;
962 int error;
963
964 error = -EFAULT;
965 if (!access_ok(VERIFY_WRITE, dirent, count))
966 goto out;
967
968 error = -EBADF;
969 file = fget(fd);
970 if (!file)
971 goto out;
972
973 buf.current_dir = dirent;
974 buf.previous = NULL;
975 buf.count = count;
976 buf.error = 0;
977
978 error = vfs_readdir(file, compat_filldir, &buf);
979 if (error >= 0)
980 error = buf.error;
981 lastdirent = buf.previous;
982 if (lastdirent) {
983 if (put_user(file->f_pos, &lastdirent->d_off))
984 error = -EFAULT;
985 else
986 error = count - buf.count;
987 }
988 fput(file);
989 out:
990 return error;
991 }
992
993 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
994
995 struct compat_getdents_callback64 {
996 struct linux_dirent64 __user *current_dir;
997 struct linux_dirent64 __user *previous;
998 int count;
999 int error;
1000 };
1001
1002 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1003 u64 ino, unsigned int d_type)
1004 {
1005 struct linux_dirent64 __user *dirent;
1006 struct compat_getdents_callback64 *buf = __buf;
1007 int jj = NAME_OFFSET(dirent);
1008 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1009 u64 off;
1010
1011 buf->error = -EINVAL; /* only used if we fail.. */
1012 if (reclen > buf->count)
1013 return -EINVAL;
1014 dirent = buf->previous;
1015
1016 if (dirent) {
1017 if (__put_user_unaligned(offset, &dirent->d_off))
1018 goto efault;
1019 }
1020 dirent = buf->current_dir;
1021 if (__put_user_unaligned(ino, &dirent->d_ino))
1022 goto efault;
1023 off = 0;
1024 if (__put_user_unaligned(off, &dirent->d_off))
1025 goto efault;
1026 if (__put_user(reclen, &dirent->d_reclen))
1027 goto efault;
1028 if (__put_user(d_type, &dirent->d_type))
1029 goto efault;
1030 if (copy_to_user(dirent->d_name, name, namlen))
1031 goto efault;
1032 if (__put_user(0, dirent->d_name + namlen))
1033 goto efault;
1034 buf->previous = dirent;
1035 dirent = (void __user *)dirent + reclen;
1036 buf->current_dir = dirent;
1037 buf->count -= reclen;
1038 return 0;
1039 efault:
1040 buf->error = -EFAULT;
1041 return -EFAULT;
1042 }
1043
1044 asmlinkage long compat_sys_getdents64(unsigned int fd,
1045 struct linux_dirent64 __user * dirent, unsigned int count)
1046 {
1047 struct file * file;
1048 struct linux_dirent64 __user * lastdirent;
1049 struct compat_getdents_callback64 buf;
1050 int error;
1051
1052 error = -EFAULT;
1053 if (!access_ok(VERIFY_WRITE, dirent, count))
1054 goto out;
1055
1056 error = -EBADF;
1057 file = fget(fd);
1058 if (!file)
1059 goto out;
1060
1061 buf.current_dir = dirent;
1062 buf.previous = NULL;
1063 buf.count = count;
1064 buf.error = 0;
1065
1066 error = vfs_readdir(file, compat_filldir64, &buf);
1067 if (error >= 0)
1068 error = buf.error;
1069 lastdirent = buf.previous;
1070 if (lastdirent) {
1071 typeof(lastdirent->d_off) d_off = file->f_pos;
1072 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1073 error = -EFAULT;
1074 else
1075 error = count - buf.count;
1076 }
1077 fput(file);
1078 out:
1079 return error;
1080 }
1081 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1082
1083 static ssize_t compat_do_readv_writev(int type, struct file *file,
1084 const struct compat_iovec __user *uvector,
1085 unsigned long nr_segs, loff_t *pos)
1086 {
1087 compat_ssize_t tot_len;
1088 struct iovec iovstack[UIO_FASTIOV];
1089 struct iovec *iov=iovstack, *vector;
1090 ssize_t ret;
1091 int seg;
1092 io_fn_t fn;
1093 iov_fn_t fnv;
1094
1095 /*
1096 * SuS says "The readv() function *may* fail if the iovcnt argument
1097 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1098 * traditionally returned zero for zero segments, so...
1099 */
1100 ret = 0;
1101 if (nr_segs == 0)
1102 goto out;
1103
1104 /*
1105 * First get the "struct iovec" from user memory and
1106 * verify all the pointers
1107 */
1108 ret = -EINVAL;
1109 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1110 goto out;
1111 if (!file->f_op)
1112 goto out;
1113 if (nr_segs > UIO_FASTIOV) {
1114 ret = -ENOMEM;
1115 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1116 if (!iov)
1117 goto out;
1118 }
1119 ret = -EFAULT;
1120 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1121 goto out;
1122
1123 /*
1124 * Single unix specification:
1125 * We should -EINVAL if an element length is not >= 0 and fitting an
1126 * ssize_t. The total length is fitting an ssize_t
1127 *
1128 * Be careful here because iov_len is a size_t not an ssize_t
1129 */
1130 tot_len = 0;
1131 vector = iov;
1132 ret = -EINVAL;
1133 for (seg = 0 ; seg < nr_segs; seg++) {
1134 compat_ssize_t tmp = tot_len;
1135 compat_ssize_t len;
1136 compat_uptr_t buf;
1137
1138 if (__get_user(len, &uvector->iov_len) ||
1139 __get_user(buf, &uvector->iov_base)) {
1140 ret = -EFAULT;
1141 goto out;
1142 }
1143 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1144 goto out;
1145 tot_len += len;
1146 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1147 goto out;
1148 vector->iov_base = compat_ptr(buf);
1149 vector->iov_len = (compat_size_t) len;
1150 uvector++;
1151 vector++;
1152 }
1153 if (tot_len == 0) {
1154 ret = 0;
1155 goto out;
1156 }
1157
1158 ret = rw_verify_area(type, file, pos, tot_len);
1159 if (ret < 0)
1160 goto out;
1161
1162 fnv = NULL;
1163 if (type == READ) {
1164 fn = file->f_op->read;
1165 fnv = file->f_op->aio_read;
1166 } else {
1167 fn = (io_fn_t)file->f_op->write;
1168 fnv = file->f_op->aio_write;
1169 }
1170
1171 if (fnv)
1172 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1173 pos, fnv);
1174 else
1175 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1176
1177 out:
1178 if (iov != iovstack)
1179 kfree(iov);
1180 if ((ret + (type == READ)) > 0) {
1181 struct dentry *dentry = file->f_path.dentry;
1182 if (type == READ)
1183 fsnotify_access(dentry);
1184 else
1185 fsnotify_modify(dentry);
1186 }
1187 return ret;
1188 }
1189
1190 static size_t compat_readv(struct file *file,
1191 const struct compat_iovec __user *vec,
1192 unsigned long vlen, loff_t *pos)
1193 {
1194 ssize_t ret = -EBADF;
1195
1196 if (!(file->f_mode & FMODE_READ))
1197 goto out;
1198
1199 ret = -EINVAL;
1200 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1201 goto out;
1202
1203 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1204
1205 out:
1206 if (ret > 0)
1207 add_rchar(current, ret);
1208 inc_syscr(current);
1209 return ret;
1210 }
1211
1212 asmlinkage ssize_t
1213 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1214 unsigned long vlen)
1215 {
1216 struct file *file;
1217 int fput_needed;
1218 ssize_t ret;
1219
1220 file = fget_light(fd, &fput_needed);
1221 if (!file)
1222 return -EBADF;
1223 ret = compat_readv(file, vec, vlen, &file->f_pos);
1224 fput_light(file, fput_needed);
1225 return ret;
1226 }
1227
1228 asmlinkage ssize_t
1229 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1230 unsigned long vlen, u32 pos_low, u32 pos_high)
1231 {
1232 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1233 struct file *file;
1234 int fput_needed;
1235 ssize_t ret;
1236
1237 if (pos < 0)
1238 return -EINVAL;
1239 file = fget_light(fd, &fput_needed);
1240 if (!file)
1241 return -EBADF;
1242 ret = compat_readv(file, vec, vlen, &pos);
1243 fput_light(file, fput_needed);
1244 return ret;
1245 }
1246
1247 static size_t compat_writev(struct file *file,
1248 const struct compat_iovec __user *vec,
1249 unsigned long vlen, loff_t *pos)
1250 {
1251 ssize_t ret = -EBADF;
1252
1253 if (!(file->f_mode & FMODE_WRITE))
1254 goto out;
1255
1256 ret = -EINVAL;
1257 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1258 goto out;
1259
1260 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1261
1262 out:
1263 if (ret > 0)
1264 add_wchar(current, ret);
1265 inc_syscw(current);
1266 return ret;
1267 }
1268
1269 asmlinkage ssize_t
1270 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1271 unsigned long vlen)
1272 {
1273 struct file *file;
1274 int fput_needed;
1275 ssize_t ret;
1276
1277 file = fget_light(fd, &fput_needed);
1278 if (!file)
1279 return -EBADF;
1280 ret = compat_writev(file, vec, vlen, &file->f_pos);
1281 fput_light(file, fput_needed);
1282 return ret;
1283 }
1284
1285 asmlinkage ssize_t
1286 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1287 unsigned long vlen, u32 pos_low, u32 pos_high)
1288 {
1289 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1290 struct file *file;
1291 int fput_needed;
1292 ssize_t ret;
1293
1294 if (pos < 0)
1295 return -EINVAL;
1296 file = fget_light(fd, &fput_needed);
1297 if (!file)
1298 return -EBADF;
1299 ret = compat_writev(file, vec, vlen, &pos);
1300 fput_light(file, fput_needed);
1301 return ret;
1302 }
1303
1304 asmlinkage long
1305 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1306 unsigned int nr_segs, unsigned int flags)
1307 {
1308 unsigned i;
1309 struct iovec __user *iov;
1310 if (nr_segs > UIO_MAXIOV)
1311 return -EINVAL;
1312 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1313 for (i = 0; i < nr_segs; i++) {
1314 struct compat_iovec v;
1315 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1316 get_user(v.iov_len, &iov32[i].iov_len) ||
1317 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1318 put_user(v.iov_len, &iov[i].iov_len))
1319 return -EFAULT;
1320 }
1321 return sys_vmsplice(fd, iov, nr_segs, flags);
1322 }
1323
1324 /*
1325 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1326 * O_LARGEFILE flag.
1327 */
1328 asmlinkage long
1329 compat_sys_open(const char __user *filename, int flags, int mode)
1330 {
1331 return do_sys_open(AT_FDCWD, filename, flags, mode);
1332 }
1333
1334 /*
1335 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1336 * O_LARGEFILE flag.
1337 */
1338 asmlinkage long
1339 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1340 {
1341 return do_sys_open(dfd, filename, flags, mode);
1342 }
1343
1344 /*
1345 * compat_count() counts the number of arguments/envelopes. It is basically
1346 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1347 * and envp pointers.
1348 */
1349 static int compat_count(compat_uptr_t __user *argv, int max)
1350 {
1351 int i = 0;
1352
1353 if (argv != NULL) {
1354 for (;;) {
1355 compat_uptr_t p;
1356
1357 if (get_user(p, argv))
1358 return -EFAULT;
1359 if (!p)
1360 break;
1361 argv++;
1362 if (i++ >= max)
1363 return -E2BIG;
1364 }
1365 }
1366 return i;
1367 }
1368
1369 /*
1370 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1371 * except that it works with 32 bit argv and envp pointers.
1372 */
1373 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1374 struct linux_binprm *bprm)
1375 {
1376 struct page *kmapped_page = NULL;
1377 char *kaddr = NULL;
1378 unsigned long kpos = 0;
1379 int ret;
1380
1381 while (argc-- > 0) {
1382 compat_uptr_t str;
1383 int len;
1384 unsigned long pos;
1385
1386 if (get_user(str, argv+argc) ||
1387 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1388 ret = -EFAULT;
1389 goto out;
1390 }
1391
1392 if (len > MAX_ARG_STRLEN) {
1393 ret = -E2BIG;
1394 goto out;
1395 }
1396
1397 /* We're going to work our way backwords. */
1398 pos = bprm->p;
1399 str += len;
1400 bprm->p -= len;
1401
1402 while (len > 0) {
1403 int offset, bytes_to_copy;
1404
1405 offset = pos % PAGE_SIZE;
1406 if (offset == 0)
1407 offset = PAGE_SIZE;
1408
1409 bytes_to_copy = offset;
1410 if (bytes_to_copy > len)
1411 bytes_to_copy = len;
1412
1413 offset -= bytes_to_copy;
1414 pos -= bytes_to_copy;
1415 str -= bytes_to_copy;
1416 len -= bytes_to_copy;
1417
1418 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1419 struct page *page;
1420
1421 #ifdef CONFIG_STACK_GROWSUP
1422 ret = expand_stack_downwards(bprm->vma, pos);
1423 if (ret < 0) {
1424 /* We've exceed the stack rlimit. */
1425 ret = -E2BIG;
1426 goto out;
1427 }
1428 #endif
1429 ret = get_user_pages(current, bprm->mm, pos,
1430 1, 1, 1, &page, NULL);
1431 if (ret <= 0) {
1432 /* We've exceed the stack rlimit. */
1433 ret = -E2BIG;
1434 goto out;
1435 }
1436
1437 if (kmapped_page) {
1438 flush_kernel_dcache_page(kmapped_page);
1439 kunmap(kmapped_page);
1440 put_page(kmapped_page);
1441 }
1442 kmapped_page = page;
1443 kaddr = kmap(kmapped_page);
1444 kpos = pos & PAGE_MASK;
1445 flush_cache_page(bprm->vma, kpos,
1446 page_to_pfn(kmapped_page));
1447 }
1448 if (copy_from_user(kaddr+offset, compat_ptr(str),
1449 bytes_to_copy)) {
1450 ret = -EFAULT;
1451 goto out;
1452 }
1453 }
1454 }
1455 ret = 0;
1456 out:
1457 if (kmapped_page) {
1458 flush_kernel_dcache_page(kmapped_page);
1459 kunmap(kmapped_page);
1460 put_page(kmapped_page);
1461 }
1462 return ret;
1463 }
1464
1465 /*
1466 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1467 * that it processes 32 bit argv and envp pointers.
1468 */
1469 int compat_do_execve(char * filename,
1470 compat_uptr_t __user *argv,
1471 compat_uptr_t __user *envp,
1472 struct pt_regs * regs)
1473 {
1474 struct linux_binprm *bprm;
1475 struct file *file;
1476 struct files_struct *displaced;
1477 int retval;
1478
1479 retval = unshare_files(&displaced);
1480 if (retval)
1481 goto out_ret;
1482
1483 retval = -ENOMEM;
1484 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1485 if (!bprm)
1486 goto out_files;
1487
1488 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
1489 if (retval < 0)
1490 goto out_free;
1491 current->in_execve = 1;
1492
1493 retval = -ENOMEM;
1494 bprm->cred = prepare_exec_creds();
1495 if (!bprm->cred)
1496 goto out_unlock;
1497
1498 retval = check_unsafe_exec(bprm);
1499 if (retval)
1500 goto out_unlock;
1501
1502 file = open_exec(filename);
1503 retval = PTR_ERR(file);
1504 if (IS_ERR(file))
1505 goto out_unmark;
1506
1507 sched_exec();
1508
1509 bprm->file = file;
1510 bprm->filename = filename;
1511 bprm->interp = filename;
1512
1513 retval = bprm_mm_init(bprm);
1514 if (retval)
1515 goto out_file;
1516
1517 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1518 if ((retval = bprm->argc) < 0)
1519 goto out;
1520
1521 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1522 if ((retval = bprm->envc) < 0)
1523 goto out;
1524
1525 retval = prepare_binprm(bprm);
1526 if (retval < 0)
1527 goto out;
1528
1529 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1530 if (retval < 0)
1531 goto out;
1532
1533 bprm->exec = bprm->p;
1534 retval = compat_copy_strings(bprm->envc, envp, bprm);
1535 if (retval < 0)
1536 goto out;
1537
1538 retval = compat_copy_strings(bprm->argc, argv, bprm);
1539 if (retval < 0)
1540 goto out;
1541
1542 retval = search_binary_handler(bprm, regs);
1543 if (retval < 0)
1544 goto out;
1545
1546 /* execve succeeded */
1547 write_lock(&current->fs->lock);
1548 current->fs->in_exec = 0;
1549 write_unlock(&current->fs->lock);
1550 current->in_execve = 0;
1551 mutex_unlock(&current->cred_exec_mutex);
1552 acct_update_integrals(current);
1553 free_bprm(bprm);
1554 if (displaced)
1555 put_files_struct(displaced);
1556 return retval;
1557
1558 out:
1559 if (bprm->mm)
1560 mmput(bprm->mm);
1561
1562 out_file:
1563 if (bprm->file) {
1564 allow_write_access(bprm->file);
1565 fput(bprm->file);
1566 }
1567
1568 out_unmark:
1569 write_lock(&current->fs->lock);
1570 current->fs->in_exec = 0;
1571 write_unlock(&current->fs->lock);
1572
1573 out_unlock:
1574 current->in_execve = 0;
1575 mutex_unlock(&current->cred_exec_mutex);
1576
1577 out_free:
1578 free_bprm(bprm);
1579
1580 out_files:
1581 if (displaced)
1582 reset_files_struct(displaced);
1583 out_ret:
1584 return retval;
1585 }
1586
1587 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1588
1589 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1590 int timeval, int ret)
1591 {
1592 struct timespec ts;
1593
1594 if (!p)
1595 return ret;
1596
1597 if (current->personality & STICKY_TIMEOUTS)
1598 goto sticky;
1599
1600 /* No update for zero timeout */
1601 if (!end_time->tv_sec && !end_time->tv_nsec)
1602 return ret;
1603
1604 ktime_get_ts(&ts);
1605 ts = timespec_sub(*end_time, ts);
1606 if (ts.tv_sec < 0)
1607 ts.tv_sec = ts.tv_nsec = 0;
1608
1609 if (timeval) {
1610 struct compat_timeval rtv;
1611
1612 rtv.tv_sec = ts.tv_sec;
1613 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1614
1615 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1616 return ret;
1617 } else {
1618 struct compat_timespec rts;
1619
1620 rts.tv_sec = ts.tv_sec;
1621 rts.tv_nsec = ts.tv_nsec;
1622
1623 if (!copy_to_user(p, &rts, sizeof(rts)))
1624 return ret;
1625 }
1626 /*
1627 * If an application puts its timeval in read-only memory, we
1628 * don't want the Linux-specific update to the timeval to
1629 * cause a fault after the select has completed
1630 * successfully. However, because we're not updating the
1631 * timeval, we can't restart the system call.
1632 */
1633
1634 sticky:
1635 if (ret == -ERESTARTNOHAND)
1636 ret = -EINTR;
1637 return ret;
1638 }
1639
1640 /*
1641 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1642 * 64-bit unsigned longs.
1643 */
1644 static
1645 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1646 unsigned long *fdset)
1647 {
1648 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1649 if (ufdset) {
1650 unsigned long odd;
1651
1652 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1653 return -EFAULT;
1654
1655 odd = nr & 1UL;
1656 nr &= ~1UL;
1657 while (nr) {
1658 unsigned long h, l;
1659 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1660 return -EFAULT;
1661 ufdset += 2;
1662 *fdset++ = h << 32 | l;
1663 nr -= 2;
1664 }
1665 if (odd && __get_user(*fdset, ufdset))
1666 return -EFAULT;
1667 } else {
1668 /* Tricky, must clear full unsigned long in the
1669 * kernel fdset at the end, this makes sure that
1670 * actually happens.
1671 */
1672 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1673 }
1674 return 0;
1675 }
1676
1677 static
1678 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1679 unsigned long *fdset)
1680 {
1681 unsigned long odd;
1682 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1683
1684 if (!ufdset)
1685 return 0;
1686
1687 odd = nr & 1UL;
1688 nr &= ~1UL;
1689 while (nr) {
1690 unsigned long h, l;
1691 l = *fdset++;
1692 h = l >> 32;
1693 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1694 return -EFAULT;
1695 ufdset += 2;
1696 nr -= 2;
1697 }
1698 if (odd && __put_user(*fdset, ufdset))
1699 return -EFAULT;
1700 return 0;
1701 }
1702
1703
1704 /*
1705 * This is a virtual copy of sys_select from fs/select.c and probably
1706 * should be compared to it from time to time
1707 */
1708
1709 /*
1710 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1711 * like to be certain this leads to no problems. So I return
1712 * EINTR just for safety.
1713 *
1714 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1715 * I'm trying ERESTARTNOHAND which restart only when you want to.
1716 */
1717 #define MAX_SELECT_SECONDS \
1718 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1719
1720 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1721 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1722 struct timespec *end_time)
1723 {
1724 fd_set_bits fds;
1725 void *bits;
1726 int size, max_fds, ret = -EINVAL;
1727 struct fdtable *fdt;
1728 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1729
1730 if (n < 0)
1731 goto out_nofds;
1732
1733 /* max_fds can increase, so grab it once to avoid race */
1734 rcu_read_lock();
1735 fdt = files_fdtable(current->files);
1736 max_fds = fdt->max_fds;
1737 rcu_read_unlock();
1738 if (n > max_fds)
1739 n = max_fds;
1740
1741 /*
1742 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1743 * since we used fdset we need to allocate memory in units of
1744 * long-words.
1745 */
1746 size = FDS_BYTES(n);
1747 bits = stack_fds;
1748 if (size > sizeof(stack_fds) / 6) {
1749 bits = kmalloc(6 * size, GFP_KERNEL);
1750 ret = -ENOMEM;
1751 if (!bits)
1752 goto out_nofds;
1753 }
1754 fds.in = (unsigned long *) bits;
1755 fds.out = (unsigned long *) (bits + size);
1756 fds.ex = (unsigned long *) (bits + 2*size);
1757 fds.res_in = (unsigned long *) (bits + 3*size);
1758 fds.res_out = (unsigned long *) (bits + 4*size);
1759 fds.res_ex = (unsigned long *) (bits + 5*size);
1760
1761 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1762 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1763 (ret = compat_get_fd_set(n, exp, fds.ex)))
1764 goto out;
1765 zero_fd_set(n, fds.res_in);
1766 zero_fd_set(n, fds.res_out);
1767 zero_fd_set(n, fds.res_ex);
1768
1769 ret = do_select(n, &fds, end_time);
1770
1771 if (ret < 0)
1772 goto out;
1773 if (!ret) {
1774 ret = -ERESTARTNOHAND;
1775 if (signal_pending(current))
1776 goto out;
1777 ret = 0;
1778 }
1779
1780 if (compat_set_fd_set(n, inp, fds.res_in) ||
1781 compat_set_fd_set(n, outp, fds.res_out) ||
1782 compat_set_fd_set(n, exp, fds.res_ex))
1783 ret = -EFAULT;
1784 out:
1785 if (bits != stack_fds)
1786 kfree(bits);
1787 out_nofds:
1788 return ret;
1789 }
1790
1791 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1792 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1793 struct compat_timeval __user *tvp)
1794 {
1795 struct timespec end_time, *to = NULL;
1796 struct compat_timeval tv;
1797 int ret;
1798
1799 if (tvp) {
1800 if (copy_from_user(&tv, tvp, sizeof(tv)))
1801 return -EFAULT;
1802
1803 to = &end_time;
1804 if (poll_select_set_timeout(to,
1805 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1806 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1807 return -EINVAL;
1808 }
1809
1810 ret = compat_core_sys_select(n, inp, outp, exp, to);
1811 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1812
1813 return ret;
1814 }
1815
1816 #ifdef HAVE_SET_RESTORE_SIGMASK
1817 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1818 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1819 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1820 compat_size_t sigsetsize)
1821 {
1822 compat_sigset_t ss32;
1823 sigset_t ksigmask, sigsaved;
1824 struct compat_timespec ts;
1825 struct timespec end_time, *to = NULL;
1826 int ret;
1827
1828 if (tsp) {
1829 if (copy_from_user(&ts, tsp, sizeof(ts)))
1830 return -EFAULT;
1831
1832 to = &end_time;
1833 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1834 return -EINVAL;
1835 }
1836
1837 if (sigmask) {
1838 if (sigsetsize != sizeof(compat_sigset_t))
1839 return -EINVAL;
1840 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1841 return -EFAULT;
1842 sigset_from_compat(&ksigmask, &ss32);
1843
1844 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1845 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1846 }
1847
1848 ret = compat_core_sys_select(n, inp, outp, exp, to);
1849 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1850
1851 if (ret == -ERESTARTNOHAND) {
1852 /*
1853 * Don't restore the signal mask yet. Let do_signal() deliver
1854 * the signal on the way back to userspace, before the signal
1855 * mask is restored.
1856 */
1857 if (sigmask) {
1858 memcpy(&current->saved_sigmask, &sigsaved,
1859 sizeof(sigsaved));
1860 set_restore_sigmask();
1861 }
1862 } else if (sigmask)
1863 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1864
1865 return ret;
1866 }
1867
1868 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1869 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1870 struct compat_timespec __user *tsp, void __user *sig)
1871 {
1872 compat_size_t sigsetsize = 0;
1873 compat_uptr_t up = 0;
1874
1875 if (sig) {
1876 if (!access_ok(VERIFY_READ, sig,
1877 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1878 __get_user(up, (compat_uptr_t __user *)sig) ||
1879 __get_user(sigsetsize,
1880 (compat_size_t __user *)(sig+sizeof(up))))
1881 return -EFAULT;
1882 }
1883 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1884 sigsetsize);
1885 }
1886
1887 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1888 unsigned int nfds, struct compat_timespec __user *tsp,
1889 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1890 {
1891 compat_sigset_t ss32;
1892 sigset_t ksigmask, sigsaved;
1893 struct compat_timespec ts;
1894 struct timespec end_time, *to = NULL;
1895 int ret;
1896
1897 if (tsp) {
1898 if (copy_from_user(&ts, tsp, sizeof(ts)))
1899 return -EFAULT;
1900
1901 to = &end_time;
1902 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1903 return -EINVAL;
1904 }
1905
1906 if (sigmask) {
1907 if (sigsetsize != sizeof(compat_sigset_t))
1908 return -EINVAL;
1909 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1910 return -EFAULT;
1911 sigset_from_compat(&ksigmask, &ss32);
1912
1913 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1914 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1915 }
1916
1917 ret = do_sys_poll(ufds, nfds, to);
1918
1919 /* We can restart this syscall, usually */
1920 if (ret == -EINTR) {
1921 /*
1922 * Don't restore the signal mask yet. Let do_signal() deliver
1923 * the signal on the way back to userspace, before the signal
1924 * mask is restored.
1925 */
1926 if (sigmask) {
1927 memcpy(&current->saved_sigmask, &sigsaved,
1928 sizeof(sigsaved));
1929 set_restore_sigmask();
1930 }
1931 ret = -ERESTARTNOHAND;
1932 } else if (sigmask)
1933 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1934
1935 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1936
1937 return ret;
1938 }
1939 #endif /* HAVE_SET_RESTORE_SIGMASK */
1940
1941 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1942 /* Stuff for NFS server syscalls... */
1943 struct compat_nfsctl_svc {
1944 u16 svc32_port;
1945 s32 svc32_nthreads;
1946 };
1947
1948 struct compat_nfsctl_client {
1949 s8 cl32_ident[NFSCLNT_IDMAX+1];
1950 s32 cl32_naddr;
1951 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1952 s32 cl32_fhkeytype;
1953 s32 cl32_fhkeylen;
1954 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1955 };
1956
1957 struct compat_nfsctl_export {
1958 char ex32_client[NFSCLNT_IDMAX+1];
1959 char ex32_path[NFS_MAXPATHLEN+1];
1960 compat_dev_t ex32_dev;
1961 compat_ino_t ex32_ino;
1962 compat_int_t ex32_flags;
1963 __compat_uid_t ex32_anon_uid;
1964 __compat_gid_t ex32_anon_gid;
1965 };
1966
1967 struct compat_nfsctl_fdparm {
1968 struct sockaddr gd32_addr;
1969 s8 gd32_path[NFS_MAXPATHLEN+1];
1970 compat_int_t gd32_version;
1971 };
1972
1973 struct compat_nfsctl_fsparm {
1974 struct sockaddr gd32_addr;
1975 s8 gd32_path[NFS_MAXPATHLEN+1];
1976 compat_int_t gd32_maxlen;
1977 };
1978
1979 struct compat_nfsctl_arg {
1980 compat_int_t ca32_version; /* safeguard */
1981 union {
1982 struct compat_nfsctl_svc u32_svc;
1983 struct compat_nfsctl_client u32_client;
1984 struct compat_nfsctl_export u32_export;
1985 struct compat_nfsctl_fdparm u32_getfd;
1986 struct compat_nfsctl_fsparm u32_getfs;
1987 } u;
1988 #define ca32_svc u.u32_svc
1989 #define ca32_client u.u32_client
1990 #define ca32_export u.u32_export
1991 #define ca32_getfd u.u32_getfd
1992 #define ca32_getfs u.u32_getfs
1993 };
1994
1995 union compat_nfsctl_res {
1996 __u8 cr32_getfh[NFS_FHSIZE];
1997 struct knfsd_fh cr32_getfs;
1998 };
1999
2000 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2001 struct compat_nfsctl_arg __user *arg)
2002 {
2003 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2004 get_user(karg->ca_version, &arg->ca32_version) ||
2005 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2006 __get_user(karg->ca_svc.svc_nthreads,
2007 &arg->ca32_svc.svc32_nthreads))
2008 return -EFAULT;
2009 return 0;
2010 }
2011
2012 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2013 struct compat_nfsctl_arg __user *arg)
2014 {
2015 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2016 sizeof(arg->ca32_client)) ||
2017 get_user(karg->ca_version, &arg->ca32_version) ||
2018 __copy_from_user(&karg->ca_client.cl_ident[0],
2019 &arg->ca32_client.cl32_ident[0],
2020 NFSCLNT_IDMAX) ||
2021 __get_user(karg->ca_client.cl_naddr,
2022 &arg->ca32_client.cl32_naddr) ||
2023 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2024 &arg->ca32_client.cl32_addrlist[0],
2025 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2026 __get_user(karg->ca_client.cl_fhkeytype,
2027 &arg->ca32_client.cl32_fhkeytype) ||
2028 __get_user(karg->ca_client.cl_fhkeylen,
2029 &arg->ca32_client.cl32_fhkeylen) ||
2030 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2031 &arg->ca32_client.cl32_fhkey[0],
2032 NFSCLNT_KEYMAX))
2033 return -EFAULT;
2034
2035 return 0;
2036 }
2037
2038 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2039 struct compat_nfsctl_arg __user *arg)
2040 {
2041 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2042 sizeof(arg->ca32_export)) ||
2043 get_user(karg->ca_version, &arg->ca32_version) ||
2044 __copy_from_user(&karg->ca_export.ex_client[0],
2045 &arg->ca32_export.ex32_client[0],
2046 NFSCLNT_IDMAX) ||
2047 __copy_from_user(&karg->ca_export.ex_path[0],
2048 &arg->ca32_export.ex32_path[0],
2049 NFS_MAXPATHLEN) ||
2050 __get_user(karg->ca_export.ex_dev,
2051 &arg->ca32_export.ex32_dev) ||
2052 __get_user(karg->ca_export.ex_ino,
2053 &arg->ca32_export.ex32_ino) ||
2054 __get_user(karg->ca_export.ex_flags,
2055 &arg->ca32_export.ex32_flags) ||
2056 __get_user(karg->ca_export.ex_anon_uid,
2057 &arg->ca32_export.ex32_anon_uid) ||
2058 __get_user(karg->ca_export.ex_anon_gid,
2059 &arg->ca32_export.ex32_anon_gid))
2060 return -EFAULT;
2061 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2062 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2063
2064 return 0;
2065 }
2066
2067 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2068 struct compat_nfsctl_arg __user *arg)
2069 {
2070 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2071 sizeof(arg->ca32_getfd)) ||
2072 get_user(karg->ca_version, &arg->ca32_version) ||
2073 __copy_from_user(&karg->ca_getfd.gd_addr,
2074 &arg->ca32_getfd.gd32_addr,
2075 (sizeof(struct sockaddr))) ||
2076 __copy_from_user(&karg->ca_getfd.gd_path,
2077 &arg->ca32_getfd.gd32_path,
2078 (NFS_MAXPATHLEN+1)) ||
2079 __get_user(karg->ca_getfd.gd_version,
2080 &arg->ca32_getfd.gd32_version))
2081 return -EFAULT;
2082
2083 return 0;
2084 }
2085
2086 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2087 struct compat_nfsctl_arg __user *arg)
2088 {
2089 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2090 get_user(karg->ca_version, &arg->ca32_version) ||
2091 __copy_from_user(&karg->ca_getfs.gd_addr,
2092 &arg->ca32_getfs.gd32_addr,
2093 (sizeof(struct sockaddr))) ||
2094 __copy_from_user(&karg->ca_getfs.gd_path,
2095 &arg->ca32_getfs.gd32_path,
2096 (NFS_MAXPATHLEN+1)) ||
2097 __get_user(karg->ca_getfs.gd_maxlen,
2098 &arg->ca32_getfs.gd32_maxlen))
2099 return -EFAULT;
2100
2101 return 0;
2102 }
2103
2104 /* This really doesn't need translations, we are only passing
2105 * back a union which contains opaque nfs file handle data.
2106 */
2107 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2108 union compat_nfsctl_res __user *res)
2109 {
2110 int err;
2111
2112 err = copy_to_user(res, kres, sizeof(*res));
2113
2114 return (err) ? -EFAULT : 0;
2115 }
2116
2117 asmlinkage long compat_sys_nfsservctl(int cmd,
2118 struct compat_nfsctl_arg __user *arg,
2119 union compat_nfsctl_res __user *res)
2120 {
2121 struct nfsctl_arg *karg;
2122 union nfsctl_res *kres;
2123 mm_segment_t oldfs;
2124 int err;
2125
2126 karg = kmalloc(sizeof(*karg), GFP_USER);
2127 kres = kmalloc(sizeof(*kres), GFP_USER);
2128 if(!karg || !kres) {
2129 err = -ENOMEM;
2130 goto done;
2131 }
2132
2133 switch(cmd) {
2134 case NFSCTL_SVC:
2135 err = compat_nfs_svc_trans(karg, arg);
2136 break;
2137
2138 case NFSCTL_ADDCLIENT:
2139 err = compat_nfs_clnt_trans(karg, arg);
2140 break;
2141
2142 case NFSCTL_DELCLIENT:
2143 err = compat_nfs_clnt_trans(karg, arg);
2144 break;
2145
2146 case NFSCTL_EXPORT:
2147 case NFSCTL_UNEXPORT:
2148 err = compat_nfs_exp_trans(karg, arg);
2149 break;
2150
2151 case NFSCTL_GETFD:
2152 err = compat_nfs_getfd_trans(karg, arg);
2153 break;
2154
2155 case NFSCTL_GETFS:
2156 err = compat_nfs_getfs_trans(karg, arg);
2157 break;
2158
2159 default:
2160 err = -EINVAL;
2161 break;
2162 }
2163
2164 if (err)
2165 goto done;
2166
2167 oldfs = get_fs();
2168 set_fs(KERNEL_DS);
2169 /* The __user pointer casts are valid because of the set_fs() */
2170 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2171 set_fs(oldfs);
2172
2173 if (err)
2174 goto done;
2175
2176 if((cmd == NFSCTL_GETFD) ||
2177 (cmd == NFSCTL_GETFS))
2178 err = compat_nfs_getfh_res_trans(kres, res);
2179
2180 done:
2181 kfree(karg);
2182 kfree(kres);
2183 return err;
2184 }
2185 #else /* !NFSD */
2186 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2187 {
2188 return sys_ni_syscall();
2189 }
2190 #endif
2191
2192 #ifdef CONFIG_EPOLL
2193
2194 #ifdef HAVE_SET_RESTORE_SIGMASK
2195 asmlinkage long compat_sys_epoll_pwait(int epfd,
2196 struct compat_epoll_event __user *events,
2197 int maxevents, int timeout,
2198 const compat_sigset_t __user *sigmask,
2199 compat_size_t sigsetsize)
2200 {
2201 long err;
2202 compat_sigset_t csigmask;
2203 sigset_t ksigmask, sigsaved;
2204
2205 /*
2206 * If the caller wants a certain signal mask to be set during the wait,
2207 * we apply it here.
2208 */
2209 if (sigmask) {
2210 if (sigsetsize != sizeof(compat_sigset_t))
2211 return -EINVAL;
2212 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2213 return -EFAULT;
2214 sigset_from_compat(&ksigmask, &csigmask);
2215 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2216 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2217 }
2218
2219 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2220
2221 /*
2222 * If we changed the signal mask, we need to restore the original one.
2223 * In case we've got a signal while waiting, we do not restore the
2224 * signal mask yet, and we allow do_signal() to deliver the signal on
2225 * the way back to userspace, before the signal mask is restored.
2226 */
2227 if (sigmask) {
2228 if (err == -EINTR) {
2229 memcpy(&current->saved_sigmask, &sigsaved,
2230 sizeof(sigsaved));
2231 set_restore_sigmask();
2232 } else
2233 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2234 }
2235
2236 return err;
2237 }
2238 #endif /* HAVE_SET_RESTORE_SIGMASK */
2239
2240 #endif /* CONFIG_EPOLL */
2241
2242 #ifdef CONFIG_SIGNALFD
2243
2244 asmlinkage long compat_sys_signalfd4(int ufd,
2245 const compat_sigset_t __user *sigmask,
2246 compat_size_t sigsetsize, int flags)
2247 {
2248 compat_sigset_t ss32;
2249 sigset_t tmp;
2250 sigset_t __user *ksigmask;
2251
2252 if (sigsetsize != sizeof(compat_sigset_t))
2253 return -EINVAL;
2254 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2255 return -EFAULT;
2256 sigset_from_compat(&tmp, &ss32);
2257 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2258 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2259 return -EFAULT;
2260
2261 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2262 }
2263
2264 asmlinkage long compat_sys_signalfd(int ufd,
2265 const compat_sigset_t __user *sigmask,
2266 compat_size_t sigsetsize)
2267 {
2268 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2269 }
2270 #endif /* CONFIG_SIGNALFD */
2271
2272 #ifdef CONFIG_TIMERFD
2273
2274 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2275 const struct compat_itimerspec __user *utmr,
2276 struct compat_itimerspec __user *otmr)
2277 {
2278 int error;
2279 struct itimerspec t;
2280 struct itimerspec __user *ut;
2281
2282 if (get_compat_itimerspec(&t, utmr))
2283 return -EFAULT;
2284 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2285 if (copy_to_user(&ut[0], &t, sizeof(t)))
2286 return -EFAULT;
2287 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2288 if (!error && otmr)
2289 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2290 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2291
2292 return error;
2293 }
2294
2295 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2296 struct compat_itimerspec __user *otmr)
2297 {
2298 int error;
2299 struct itimerspec t;
2300 struct itimerspec __user *ut;
2301
2302 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2303 error = sys_timerfd_gettime(ufd, ut);
2304 if (!error)
2305 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2306 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2307
2308 return error;
2309 }
2310
2311 #endif /* CONFIG_TIMERFD */
Linux kernel - Deliverables
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