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