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slram: Read buffer overflow
[linux-2.6/mini2440.git] / fs / compat.c
blob94502dab972af5ad4d2bd558f50f896cd8a35db3
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/syscalls.h>
36 #include <linux/ctype.h>
37 #include <linux/module.h>
38 #include <linux/dirent.h>
39 #include <linux/fsnotify.h>
40 #include <linux/highuid.h>
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/syscall.h>
44 #include <linux/personality.h>
45 #include <linux/rwsem.h>
46 #include <linux/tsacct_kern.h>
47 #include <linux/security.h>
48 #include <linux/highmem.h>
49 #include <linux/signal.h>
50 #include <linux/poll.h>
51 #include <linux/mm.h>
52 #include <linux/eventpoll.h>
53 #include <linux/fs_struct.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
104 && tv[0].tv_sec != 0)
105 return -EINVAL;
106 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107 && tv[1].tv_sec != 0)
108 return -EINVAL;
109
110 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111 return 0;
112 }
113 return do_utimes(dfd, filename, t ? tv : NULL, flags);
114 }
115
116 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
117 {
118 struct timespec tv[2];
119
120 if (t) {
121 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
122 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
123 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
124 get_user(tv[1].tv_nsec, &t[1].tv_usec))
125 return -EFAULT;
126 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128 return -EINVAL;
129 tv[0].tv_nsec *= 1000;
130 tv[1].tv_nsec *= 1000;
131 }
132 return do_utimes(dfd, filename, t ? tv : NULL, 0);
133 }
134
135 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136 {
137 return compat_sys_futimesat(AT_FDCWD, filename, t);
138 }
139
140 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
141 {
142 compat_ino_t ino = stat->ino;
143 typeof(ubuf->st_uid) uid = 0;
144 typeof(ubuf->st_gid) gid = 0;
145 int err;
146
147 SET_UID(uid, stat->uid);
148 SET_GID(gid, stat->gid);
149
150 if ((u64) stat->size > MAX_NON_LFS ||
151 !old_valid_dev(stat->dev) ||
152 !old_valid_dev(stat->rdev))
153 return -EOVERFLOW;
154 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
155 return -EOVERFLOW;
156
157 if (clear_user(ubuf, sizeof(*ubuf)))
158 return -EFAULT;
159
160 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
161 err |= __put_user(ino, &ubuf->st_ino);
162 err |= __put_user(stat->mode, &ubuf->st_mode);
163 err |= __put_user(stat->nlink, &ubuf->st_nlink);
164 err |= __put_user(uid, &ubuf->st_uid);
165 err |= __put_user(gid, &ubuf->st_gid);
166 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
167 err |= __put_user(stat->size, &ubuf->st_size);
168 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
169 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
170 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
171 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
172 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
173 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
174 err |= __put_user(stat->blksize, &ubuf->st_blksize);
175 err |= __put_user(stat->blocks, &ubuf->st_blocks);
176 return err;
177 }
178
179 asmlinkage long compat_sys_newstat(char __user * filename,
180 struct compat_stat __user *statbuf)
181 {
182 struct kstat stat;
183 int error;
184
185 error = vfs_stat(filename, &stat);
186 if (error)
187 return error;
188 return cp_compat_stat(&stat, statbuf);
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;
196
197 error = vfs_lstat(filename, &stat);
198 if (error)
199 return error;
200 return cp_compat_stat(&stat, statbuf);
201 }
202
203 #ifndef __ARCH_WANT_STAT64
204 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
205 struct compat_stat __user *statbuf, int flag)
206 {
207 struct kstat stat;
208 int error;
209
210 error = vfs_fstatat(dfd, filename, &stat, flag);
211 if (error)
212 return error;
213 return cp_compat_stat(&stat, statbuf);
214 }
215 #endif
216
217 asmlinkage long compat_sys_newfstat(unsigned int fd,
218 struct compat_stat __user * statbuf)
219 {
220 struct kstat stat;
221 int error = vfs_fstat(fd, &stat);
222
223 if (!error)
224 error = cp_compat_stat(&stat, statbuf);
225 return error;
226 }
227
228 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
229 {
230
231 if (sizeof ubuf->f_blocks == 4) {
232 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
233 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
234 return -EOVERFLOW;
235 /* f_files and f_ffree may be -1; it's okay
236 * to stuff that into 32 bits */
237 if (kbuf->f_files != 0xffffffffffffffffULL
238 && (kbuf->f_files & 0xffffffff00000000ULL))
239 return -EOVERFLOW;
240 if (kbuf->f_ffree != 0xffffffffffffffffULL
241 && (kbuf->f_ffree & 0xffffffff00000000ULL))
242 return -EOVERFLOW;
243 }
244 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
245 __put_user(kbuf->f_type, &ubuf->f_type) ||
246 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
247 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
248 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
249 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
250 __put_user(kbuf->f_files, &ubuf->f_files) ||
251 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
252 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
253 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
254 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
255 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
256 __put_user(0, &ubuf->f_spare[0]) ||
257 __put_user(0, &ubuf->f_spare[1]) ||
258 __put_user(0, &ubuf->f_spare[2]) ||
259 __put_user(0, &ubuf->f_spare[3]) ||
260 __put_user(0, &ubuf->f_spare[4]))
261 return -EFAULT;
262 return 0;
263 }
264
265 /*
266 * The following statfs calls are copies of code from fs/open.c and
267 * should be checked against those from time to time
268 */
269 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
270 {
271 struct path path;
272 int error;
273
274 error = user_path(pathname, &path);
275 if (!error) {
276 struct kstatfs tmp;
277 error = vfs_statfs(path.dentry, &tmp);
278 if (!error)
279 error = put_compat_statfs(buf, &tmp);
280 path_put(&path);
281 }
282 return error;
283 }
284
285 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
286 {
287 struct file * file;
288 struct kstatfs tmp;
289 int error;
290
291 error = -EBADF;
292 file = fget(fd);
293 if (!file)
294 goto out;
295 error = vfs_statfs(file->f_path.dentry, &tmp);
296 if (!error)
297 error = put_compat_statfs(buf, &tmp);
298 fput(file);
299 out:
300 return error;
301 }
302
303 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
304 {
305 if (sizeof ubuf->f_blocks == 4) {
306 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
307 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
308 return -EOVERFLOW;
309 /* f_files and f_ffree may be -1; it's okay
310 * to stuff that into 32 bits */
311 if (kbuf->f_files != 0xffffffffffffffffULL
312 && (kbuf->f_files & 0xffffffff00000000ULL))
313 return -EOVERFLOW;
314 if (kbuf->f_ffree != 0xffffffffffffffffULL
315 && (kbuf->f_ffree & 0xffffffff00000000ULL))
316 return -EOVERFLOW;
317 }
318 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
319 __put_user(kbuf->f_type, &ubuf->f_type) ||
320 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
321 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
322 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
323 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
324 __put_user(kbuf->f_files, &ubuf->f_files) ||
325 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
326 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
327 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
328 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
329 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
330 return -EFAULT;
331 return 0;
332 }
333
334 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
335 {
336 struct path path;
337 int error;
338
339 if (sz != sizeof(*buf))
340 return -EINVAL;
341
342 error = user_path(pathname, &path);
343 if (!error) {
344 struct kstatfs tmp;
345 error = vfs_statfs(path.dentry, &tmp);
346 if (!error)
347 error = put_compat_statfs64(buf, &tmp);
348 path_put(&path);
349 }
350 return error;
351 }
352
353 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
354 {
355 struct file * file;
356 struct kstatfs tmp;
357 int error;
358
359 if (sz != sizeof(*buf))
360 return -EINVAL;
361
362 error = -EBADF;
363 file = fget(fd);
364 if (!file)
365 goto out;
366 error = vfs_statfs(file->f_path.dentry, &tmp);
367 if (!error)
368 error = put_compat_statfs64(buf, &tmp);
369 fput(file);
370 out:
371 return error;
372 }
373
374 /*
375 * This is a copy of sys_ustat, just dealing with a structure layout.
376 * Given how simple this syscall is that apporach is more maintainable
377 * than the various conversion hacks.
378 */
379 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
380 {
381 struct super_block *sb;
382 struct compat_ustat tmp;
383 struct kstatfs sbuf;
384 int err;
385
386 sb = user_get_super(new_decode_dev(dev));
387 if (!sb)
388 return -EINVAL;
389 err = vfs_statfs(sb->s_root, &sbuf);
390 drop_super(sb);
391 if (err)
392 return err;
393
394 memset(&tmp, 0, sizeof(struct compat_ustat));
395 tmp.f_tfree = sbuf.f_bfree;
396 tmp.f_tinode = sbuf.f_ffree;
397 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
398 return -EFAULT;
399 return 0;
400 }
401
402 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
403 {
404 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
405 __get_user(kfl->l_type, &ufl->l_type) ||
406 __get_user(kfl->l_whence, &ufl->l_whence) ||
407 __get_user(kfl->l_start, &ufl->l_start) ||
408 __get_user(kfl->l_len, &ufl->l_len) ||
409 __get_user(kfl->l_pid, &ufl->l_pid))
410 return -EFAULT;
411 return 0;
412 }
413
414 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
415 {
416 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
417 __put_user(kfl->l_type, &ufl->l_type) ||
418 __put_user(kfl->l_whence, &ufl->l_whence) ||
419 __put_user(kfl->l_start, &ufl->l_start) ||
420 __put_user(kfl->l_len, &ufl->l_len) ||
421 __put_user(kfl->l_pid, &ufl->l_pid))
422 return -EFAULT;
423 return 0;
424 }
425
426 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
427 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
428 {
429 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
430 __get_user(kfl->l_type, &ufl->l_type) ||
431 __get_user(kfl->l_whence, &ufl->l_whence) ||
432 __get_user(kfl->l_start, &ufl->l_start) ||
433 __get_user(kfl->l_len, &ufl->l_len) ||
434 __get_user(kfl->l_pid, &ufl->l_pid))
435 return -EFAULT;
436 return 0;
437 }
438 #endif
439
440 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
441 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
442 {
443 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
444 __put_user(kfl->l_type, &ufl->l_type) ||
445 __put_user(kfl->l_whence, &ufl->l_whence) ||
446 __put_user(kfl->l_start, &ufl->l_start) ||
447 __put_user(kfl->l_len, &ufl->l_len) ||
448 __put_user(kfl->l_pid, &ufl->l_pid))
449 return -EFAULT;
450 return 0;
451 }
452 #endif
453
454 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
455 unsigned long arg)
456 {
457 mm_segment_t old_fs;
458 struct flock f;
459 long ret;
460
461 switch (cmd) {
462 case F_GETLK:
463 case F_SETLK:
464 case F_SETLKW:
465 ret = get_compat_flock(&f, compat_ptr(arg));
466 if (ret != 0)
467 break;
468 old_fs = get_fs();
469 set_fs(KERNEL_DS);
470 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
471 set_fs(old_fs);
472 if (cmd == F_GETLK && ret == 0) {
473 /* GETLK was successful and we need to return the data...
474 * but it needs to fit in the compat structure.
475 * l_start shouldn't be too big, unless the original
476 * start + end is greater than COMPAT_OFF_T_MAX, in which
477 * case the app was asking for trouble, so we return
478 * -EOVERFLOW in that case.
479 * l_len could be too big, in which case we just truncate it,
480 * and only allow the app to see that part of the conflicting
481 * lock that might make sense to it anyway
482 */
483
484 if (f.l_start > COMPAT_OFF_T_MAX)
485 ret = -EOVERFLOW;
486 if (f.l_len > COMPAT_OFF_T_MAX)
487 f.l_len = COMPAT_OFF_T_MAX;
488 if (ret == 0)
489 ret = put_compat_flock(&f, compat_ptr(arg));
490 }
491 break;
492
493 case F_GETLK64:
494 case F_SETLK64:
495 case F_SETLKW64:
496 ret = get_compat_flock64(&f, compat_ptr(arg));
497 if (ret != 0)
498 break;
499 old_fs = get_fs();
500 set_fs(KERNEL_DS);
501 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
502 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
503 (unsigned long)&f);
504 set_fs(old_fs);
505 if (cmd == F_GETLK64 && ret == 0) {
506 /* need to return lock information - see above for commentary */
507 if (f.l_start > COMPAT_LOFF_T_MAX)
508 ret = -EOVERFLOW;
509 if (f.l_len > COMPAT_LOFF_T_MAX)
510 f.l_len = COMPAT_LOFF_T_MAX;
511 if (ret == 0)
512 ret = put_compat_flock64(&f, compat_ptr(arg));
513 }
514 break;
515
516 default:
517 ret = sys_fcntl(fd, cmd, arg);
518 break;
519 }
520 return ret;
521 }
522
523 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
524 unsigned long arg)
525 {
526 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
527 return -EINVAL;
528 return compat_sys_fcntl64(fd, cmd, arg);
529 }
530
531 asmlinkage long
532 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
533 {
534 long ret;
535 aio_context_t ctx64;
536
537 mm_segment_t oldfs = get_fs();
538 if (unlikely(get_user(ctx64, ctx32p)))
539 return -EFAULT;
540
541 set_fs(KERNEL_DS);
542 /* The __user pointer cast is valid because of the set_fs() */
543 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
544 set_fs(oldfs);
545 /* truncating is ok because it's a user address */
546 if (!ret)
547 ret = put_user((u32) ctx64, ctx32p);
548 return ret;
549 }
550
551 asmlinkage long
552 compat_sys_io_getevents(aio_context_t ctx_id,
553 unsigned long min_nr,
554 unsigned long nr,
555 struct io_event __user *events,
556 struct compat_timespec __user *timeout)
557 {
558 long ret;
559 struct timespec t;
560 struct timespec __user *ut = NULL;
561
562 ret = -EFAULT;
563 if (unlikely(!access_ok(VERIFY_WRITE, events,
564 nr * sizeof(struct io_event))))
565 goto out;
566 if (timeout) {
567 if (get_compat_timespec(&t, timeout))
568 goto out;
569
570 ut = compat_alloc_user_space(sizeof(*ut));
571 if (copy_to_user(ut, &t, sizeof(t)) )
572 goto out;
573 }
574 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
575 out:
576 return ret;
577 }
578
579 static inline long
580 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
581 {
582 compat_uptr_t uptr;
583 int i;
584
585 for (i = 0; i < nr; ++i) {
586 if (get_user(uptr, ptr32 + i))
587 return -EFAULT;
588 if (put_user(compat_ptr(uptr), ptr64 + i))
589 return -EFAULT;
590 }
591 return 0;
592 }
593
594 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
595
596 asmlinkage long
597 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
598 {
599 struct iocb __user * __user *iocb64;
600 long ret;
601
602 if (unlikely(nr < 0))
603 return -EINVAL;
604
605 if (nr > MAX_AIO_SUBMITS)
606 nr = MAX_AIO_SUBMITS;
607
608 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
609 ret = copy_iocb(nr, iocb, iocb64);
610 if (!ret)
611 ret = sys_io_submit(ctx_id, nr, iocb64);
612 return ret;
613 }
614
615 struct compat_ncp_mount_data {
616 compat_int_t version;
617 compat_uint_t ncp_fd;
618 __compat_uid_t mounted_uid;
619 compat_pid_t wdog_pid;
620 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
621 compat_uint_t time_out;
622 compat_uint_t retry_count;
623 compat_uint_t flags;
624 __compat_uid_t uid;
625 __compat_gid_t gid;
626 compat_mode_t file_mode;
627 compat_mode_t dir_mode;
628 };
629
630 struct compat_ncp_mount_data_v4 {
631 compat_int_t version;
632 compat_ulong_t flags;
633 compat_ulong_t mounted_uid;
634 compat_long_t wdog_pid;
635 compat_uint_t ncp_fd;
636 compat_uint_t time_out;
637 compat_uint_t retry_count;
638 compat_ulong_t uid;
639 compat_ulong_t gid;
640 compat_ulong_t file_mode;
641 compat_ulong_t dir_mode;
642 };
643
644 static void *do_ncp_super_data_conv(void *raw_data)
645 {
646 int version = *(unsigned int *)raw_data;
647
648 if (version == 3) {
649 struct compat_ncp_mount_data *c_n = raw_data;
650 struct ncp_mount_data *n = raw_data;
651
652 n->dir_mode = c_n->dir_mode;
653 n->file_mode = c_n->file_mode;
654 n->gid = c_n->gid;
655 n->uid = c_n->uid;
656 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
657 n->wdog_pid = c_n->wdog_pid;
658 n->mounted_uid = c_n->mounted_uid;
659 } else if (version == 4) {
660 struct compat_ncp_mount_data_v4 *c_n = raw_data;
661 struct ncp_mount_data_v4 *n = raw_data;
662
663 n->dir_mode = c_n->dir_mode;
664 n->file_mode = c_n->file_mode;
665 n->gid = c_n->gid;
666 n->uid = c_n->uid;
667 n->retry_count = c_n->retry_count;
668 n->time_out = c_n->time_out;
669 n->ncp_fd = c_n->ncp_fd;
670 n->wdog_pid = c_n->wdog_pid;
671 n->mounted_uid = c_n->mounted_uid;
672 n->flags = c_n->flags;
673 } else if (version != 5) {
674 return NULL;
675 }
676
677 return raw_data;
678 }
679
680 struct compat_smb_mount_data {
681 compat_int_t version;
682 __compat_uid_t mounted_uid;
683 __compat_uid_t uid;
684 __compat_gid_t gid;
685 compat_mode_t file_mode;
686 compat_mode_t dir_mode;
687 };
688
689 static void *do_smb_super_data_conv(void *raw_data)
690 {
691 struct smb_mount_data *s = raw_data;
692 struct compat_smb_mount_data *c_s = raw_data;
693
694 if (c_s->version != SMB_MOUNT_OLDVERSION)
695 goto out;
696 s->dir_mode = c_s->dir_mode;
697 s->file_mode = c_s->file_mode;
698 s->gid = c_s->gid;
699 s->uid = c_s->uid;
700 s->mounted_uid = c_s->mounted_uid;
701 out:
702 return raw_data;
703 }
704
705 struct compat_nfs_string {
706 compat_uint_t len;
707 compat_uptr_t data;
708 };
709
710 static inline void compat_nfs_string(struct nfs_string *dst,
711 struct compat_nfs_string *src)
712 {
713 dst->data = compat_ptr(src->data);
714 dst->len = src->len;
715 }
716
717 struct compat_nfs4_mount_data_v1 {
718 compat_int_t version;
719 compat_int_t flags;
720 compat_int_t rsize;
721 compat_int_t wsize;
722 compat_int_t timeo;
723 compat_int_t retrans;
724 compat_int_t acregmin;
725 compat_int_t acregmax;
726 compat_int_t acdirmin;
727 compat_int_t acdirmax;
728 struct compat_nfs_string client_addr;
729 struct compat_nfs_string mnt_path;
730 struct compat_nfs_string hostname;
731 compat_uint_t host_addrlen;
732 compat_uptr_t host_addr;
733 compat_int_t proto;
734 compat_int_t auth_flavourlen;
735 compat_uptr_t auth_flavours;
736 };
737
738 static int do_nfs4_super_data_conv(void *raw_data)
739 {
740 int version = *(compat_uint_t *) raw_data;
741
742 if (version == 1) {
743 struct compat_nfs4_mount_data_v1 *raw = raw_data;
744 struct nfs4_mount_data *real = raw_data;
745
746 /* copy the fields backwards */
747 real->auth_flavours = compat_ptr(raw->auth_flavours);
748 real->auth_flavourlen = raw->auth_flavourlen;
749 real->proto = raw->proto;
750 real->host_addr = compat_ptr(raw->host_addr);
751 real->host_addrlen = raw->host_addrlen;
752 compat_nfs_string(&real->hostname, &raw->hostname);
753 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
754 compat_nfs_string(&real->client_addr, &raw->client_addr);
755 real->acdirmax = raw->acdirmax;
756 real->acdirmin = raw->acdirmin;
757 real->acregmax = raw->acregmax;
758 real->acregmin = raw->acregmin;
759 real->retrans = raw->retrans;
760 real->timeo = raw->timeo;
761 real->wsize = raw->wsize;
762 real->rsize = raw->rsize;
763 real->flags = raw->flags;
764 real->version = raw->version;
765 }
766
767 return 0;
768 }
769
770 #define SMBFS_NAME "smbfs"
771 #define NCPFS_NAME "ncpfs"
772 #define NFS4_NAME "nfs4"
773
774 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
775 char __user * type, unsigned long flags,
776 void __user * data)
777 {
778 unsigned long type_page;
779 unsigned long data_page;
780 unsigned long dev_page;
781 char *dir_page;
782 int retval;
783
784 retval = copy_mount_options (type, &type_page);
785 if (retval < 0)
786 goto out;
787
788 dir_page = getname(dir_name);
789 retval = PTR_ERR(dir_page);
790 if (IS_ERR(dir_page))
791 goto out1;
792
793 retval = copy_mount_options (dev_name, &dev_page);
794 if (retval < 0)
795 goto out2;
796
797 retval = copy_mount_options (data, &data_page);
798 if (retval < 0)
799 goto out3;
800
801 retval = -EINVAL;
802
803 if (type_page && data_page) {
804 if (!strcmp((char *)type_page, SMBFS_NAME)) {
805 do_smb_super_data_conv((void *)data_page);
806 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
807 do_ncp_super_data_conv((void *)data_page);
808 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
809 if (do_nfs4_super_data_conv((void *) data_page))
810 goto out4;
811 }
812 }
813
814 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
815 flags, (void*)data_page);
816
817 out4:
818 free_page(data_page);
819 out3:
820 free_page(dev_page);
821 out2:
822 putname(dir_page);
823 out1:
824 free_page(type_page);
825 out:
826 return retval;
827 }
828
829 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
830
831 struct compat_old_linux_dirent {
832 compat_ulong_t d_ino;
833 compat_ulong_t d_offset;
834 unsigned short d_namlen;
835 char d_name[1];
836 };
837
838 struct compat_readdir_callback {
839 struct compat_old_linux_dirent __user *dirent;
840 int result;
841 };
842
843 static int compat_fillonedir(void *__buf, const char *name, int namlen,
844 loff_t offset, u64 ino, unsigned int d_type)
845 {
846 struct compat_readdir_callback *buf = __buf;
847 struct compat_old_linux_dirent __user *dirent;
848 compat_ulong_t d_ino;
849
850 if (buf->result)
851 return -EINVAL;
852 d_ino = ino;
853 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
854 buf->result = -EOVERFLOW;
855 return -EOVERFLOW;
856 }
857 buf->result++;
858 dirent = buf->dirent;
859 if (!access_ok(VERIFY_WRITE, dirent,
860 (unsigned long)(dirent->d_name + namlen + 1) -
861 (unsigned long)dirent))
862 goto efault;
863 if ( __put_user(d_ino, &dirent->d_ino) ||
864 __put_user(offset, &dirent->d_offset) ||
865 __put_user(namlen, &dirent->d_namlen) ||
866 __copy_to_user(dirent->d_name, name, namlen) ||
867 __put_user(0, dirent->d_name + namlen))
868 goto efault;
869 return 0;
870 efault:
871 buf->result = -EFAULT;
872 return -EFAULT;
873 }
874
875 asmlinkage long compat_sys_old_readdir(unsigned int fd,
876 struct compat_old_linux_dirent __user *dirent, unsigned int count)
877 {
878 int error;
879 struct file *file;
880 struct compat_readdir_callback buf;
881
882 error = -EBADF;
883 file = fget(fd);
884 if (!file)
885 goto out;
886
887 buf.result = 0;
888 buf.dirent = dirent;
889
890 error = vfs_readdir(file, compat_fillonedir, &buf);
891 if (buf.result)
892 error = buf.result;
893
894 fput(file);
895 out:
896 return error;
897 }
898
899 struct compat_linux_dirent {
900 compat_ulong_t d_ino;
901 compat_ulong_t d_off;
902 unsigned short d_reclen;
903 char d_name[1];
904 };
905
906 struct compat_getdents_callback {
907 struct compat_linux_dirent __user *current_dir;
908 struct compat_linux_dirent __user *previous;
909 int count;
910 int error;
911 };
912
913 static int compat_filldir(void *__buf, const char *name, int namlen,
914 loff_t offset, u64 ino, unsigned int d_type)
915 {
916 struct compat_linux_dirent __user * dirent;
917 struct compat_getdents_callback *buf = __buf;
918 compat_ulong_t d_ino;
919 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
920
921 buf->error = -EINVAL; /* only used if we fail.. */
922 if (reclen > buf->count)
923 return -EINVAL;
924 d_ino = ino;
925 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
926 buf->error = -EOVERFLOW;
927 return -EOVERFLOW;
928 }
929 dirent = buf->previous;
930 if (dirent) {
931 if (__put_user(offset, &dirent->d_off))
932 goto efault;
933 }
934 dirent = buf->current_dir;
935 if (__put_user(d_ino, &dirent->d_ino))
936 goto efault;
937 if (__put_user(reclen, &dirent->d_reclen))
938 goto efault;
939 if (copy_to_user(dirent->d_name, name, namlen))
940 goto efault;
941 if (__put_user(0, dirent->d_name + namlen))
942 goto efault;
943 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
944 goto efault;
945 buf->previous = dirent;
946 dirent = (void __user *)dirent + reclen;
947 buf->current_dir = dirent;
948 buf->count -= reclen;
949 return 0;
950 efault:
951 buf->error = -EFAULT;
952 return -EFAULT;
953 }
954
955 asmlinkage long compat_sys_getdents(unsigned int fd,
956 struct compat_linux_dirent __user *dirent, unsigned int count)
957 {
958 struct file * file;
959 struct compat_linux_dirent __user * lastdirent;
960 struct compat_getdents_callback buf;
961 int error;
962
963 error = -EFAULT;
964 if (!access_ok(VERIFY_WRITE, dirent, count))
965 goto out;
966
967 error = -EBADF;
968 file = fget(fd);
969 if (!file)
970 goto out;
971
972 buf.current_dir = dirent;
973 buf.previous = NULL;
974 buf.count = count;
975 buf.error = 0;
976
977 error = vfs_readdir(file, compat_filldir, &buf);
978 if (error >= 0)
979 error = buf.error;
980 lastdirent = buf.previous;
981 if (lastdirent) {
982 if (put_user(file->f_pos, &lastdirent->d_off))
983 error = -EFAULT;
984 else
985 error = count - buf.count;
986 }
987 fput(file);
988 out:
989 return error;
990 }
991
992 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
993
994 struct compat_getdents_callback64 {
995 struct linux_dirent64 __user *current_dir;
996 struct linux_dirent64 __user *previous;
997 int count;
998 int error;
999 };
1000
1001 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1002 u64 ino, unsigned int d_type)
1003 {
1004 struct linux_dirent64 __user *dirent;
1005 struct compat_getdents_callback64 *buf = __buf;
1006 int jj = NAME_OFFSET(dirent);
1007 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1008 u64 off;
1009
1010 buf->error = -EINVAL; /* only used if we fail.. */
1011 if (reclen > buf->count)
1012 return -EINVAL;
1013 dirent = buf->previous;
1014
1015 if (dirent) {
1016 if (__put_user_unaligned(offset, &dirent->d_off))
1017 goto efault;
1018 }
1019 dirent = buf->current_dir;
1020 if (__put_user_unaligned(ino, &dirent->d_ino))
1021 goto efault;
1022 off = 0;
1023 if (__put_user_unaligned(off, &dirent->d_off))
1024 goto efault;
1025 if (__put_user(reclen, &dirent->d_reclen))
1026 goto efault;
1027 if (__put_user(d_type, &dirent->d_type))
1028 goto efault;
1029 if (copy_to_user(dirent->d_name, name, namlen))
1030 goto efault;
1031 if (__put_user(0, dirent->d_name + namlen))
1032 goto efault;
1033 buf->previous = dirent;
1034 dirent = (void __user *)dirent + reclen;
1035 buf->current_dir = dirent;
1036 buf->count -= reclen;
1037 return 0;
1038 efault:
1039 buf->error = -EFAULT;
1040 return -EFAULT;
1041 }
1042
1043 asmlinkage long compat_sys_getdents64(unsigned int fd,
1044 struct linux_dirent64 __user * dirent, unsigned int count)
1045 {
1046 struct file * file;
1047 struct linux_dirent64 __user * lastdirent;
1048 struct compat_getdents_callback64 buf;
1049 int error;
1050
1051 error = -EFAULT;
1052 if (!access_ok(VERIFY_WRITE, dirent, count))
1053 goto out;
1054
1055 error = -EBADF;
1056 file = fget(fd);
1057 if (!file)
1058 goto out;
1059
1060 buf.current_dir = dirent;
1061 buf.previous = NULL;
1062 buf.count = count;
1063 buf.error = 0;
1064
1065 error = vfs_readdir(file, compat_filldir64, &buf);
1066 if (error >= 0)
1067 error = buf.error;
1068 lastdirent = buf.previous;
1069 if (lastdirent) {
1070 typeof(lastdirent->d_off) d_off = file->f_pos;
1071 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1072 error = -EFAULT;
1073 else
1074 error = count - buf.count;
1075 }
1076 fput(file);
1077 out:
1078 return error;
1079 }
1080 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1081
1082 static ssize_t compat_do_readv_writev(int type, struct file *file,
1083 const struct compat_iovec __user *uvector,
1084 unsigned long nr_segs, loff_t *pos)
1085 {
1086 compat_ssize_t tot_len;
1087 struct iovec iovstack[UIO_FASTIOV];
1088 struct iovec *iov=iovstack, *vector;
1089 ssize_t ret;
1090 int seg;
1091 io_fn_t fn;
1092 iov_fn_t fnv;
1093
1094 /*
1095 * SuS says "The readv() function *may* fail if the iovcnt argument
1096 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1097 * traditionally returned zero for zero segments, so...
1098 */
1099 ret = 0;
1100 if (nr_segs == 0)
1101 goto out;
1102
1103 /*
1104 * First get the "struct iovec" from user memory and
1105 * verify all the pointers
1106 */
1107 ret = -EINVAL;
1108 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1109 goto out;
1110 if (!file->f_op)
1111 goto out;
1112 if (nr_segs > UIO_FASTIOV) {
1113 ret = -ENOMEM;
1114 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1115 if (!iov)
1116 goto out;
1117 }
1118 ret = -EFAULT;
1119 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1120 goto out;
1121
1122 /*
1123 * Single unix specification:
1124 * We should -EINVAL if an element length is not >= 0 and fitting an
1125 * ssize_t. The total length is fitting an ssize_t
1126 *
1127 * Be careful here because iov_len is a size_t not an ssize_t
1128 */
1129 tot_len = 0;
1130 vector = iov;
1131 ret = -EINVAL;
1132 for (seg = 0 ; seg < nr_segs; seg++) {
1133 compat_ssize_t tmp = tot_len;
1134 compat_ssize_t len;
1135 compat_uptr_t buf;
1136
1137 if (__get_user(len, &uvector->iov_len) ||
1138 __get_user(buf, &uvector->iov_base)) {
1139 ret = -EFAULT;
1140 goto out;
1141 }
1142 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1143 goto out;
1144 tot_len += len;
1145 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1146 goto out;
1147 vector->iov_base = compat_ptr(buf);
1148 vector->iov_len = (compat_size_t) len;
1149 uvector++;
1150 vector++;
1151 }
1152 if (tot_len == 0) {
1153 ret = 0;
1154 goto out;
1155 }
1156
1157 ret = rw_verify_area(type, file, pos, tot_len);
1158 if (ret < 0)
1159 goto out;
1160
1161 fnv = NULL;
1162 if (type == READ) {
1163 fn = file->f_op->read;
1164 fnv = file->f_op->aio_read;
1165 } else {
1166 fn = (io_fn_t)file->f_op->write;
1167 fnv = file->f_op->aio_write;
1168 }
1169
1170 if (fnv)
1171 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1172 pos, fnv);
1173 else
1174 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1175
1176 out:
1177 if (iov != iovstack)
1178 kfree(iov);
1179 if ((ret + (type == READ)) > 0) {
1180 struct dentry *dentry = file->f_path.dentry;
1181 if (type == READ)
1182 fsnotify_access(dentry);
1183 else
1184 fsnotify_modify(dentry);
1185 }
1186 return ret;
1187 }
1188
1189 static size_t compat_readv(struct file *file,
1190 const struct compat_iovec __user *vec,
1191 unsigned long vlen, loff_t *pos)
1192 {
1193 ssize_t ret = -EBADF;
1194
1195 if (!(file->f_mode & FMODE_READ))
1196 goto out;
1197
1198 ret = -EINVAL;
1199 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1200 goto out;
1201
1202 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1203
1204 out:
1205 if (ret > 0)
1206 add_rchar(current, ret);
1207 inc_syscr(current);
1208 return ret;
1209 }
1210
1211 asmlinkage ssize_t
1212 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1213 unsigned long vlen)
1214 {
1215 struct file *file;
1216 int fput_needed;
1217 ssize_t ret;
1218
1219 file = fget_light(fd, &fput_needed);
1220 if (!file)
1221 return -EBADF;
1222 ret = compat_readv(file, vec, vlen, &file->f_pos);
1223 fput_light(file, fput_needed);
1224 return ret;
1225 }
1226
1227 asmlinkage ssize_t
1228 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1229 unsigned long vlen, u32 pos_low, u32 pos_high)
1230 {
1231 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1232 struct file *file;
1233 int fput_needed;
1234 ssize_t ret;
1235
1236 if (pos < 0)
1237 return -EINVAL;
1238 file = fget_light(fd, &fput_needed);
1239 if (!file)
1240 return -EBADF;
1241 ret = compat_readv(file, vec, vlen, &pos);
1242 fput_light(file, fput_needed);
1243 return ret;
1244 }
1245
1246 static size_t compat_writev(struct file *file,
1247 const struct compat_iovec __user *vec,
1248 unsigned long vlen, loff_t *pos)
1249 {
1250 ssize_t ret = -EBADF;
1251
1252 if (!(file->f_mode & FMODE_WRITE))
1253 goto out;
1254
1255 ret = -EINVAL;
1256 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1257 goto out;
1258
1259 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1260
1261 out:
1262 if (ret > 0)
1263 add_wchar(current, ret);
1264 inc_syscw(current);
1265 return ret;
1266 }
1267
1268 asmlinkage ssize_t
1269 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1270 unsigned long vlen)
1271 {
1272 struct file *file;
1273 int fput_needed;
1274 ssize_t ret;
1275
1276 file = fget_light(fd, &fput_needed);
1277 if (!file)
1278 return -EBADF;
1279 ret = compat_writev(file, vec, vlen, &file->f_pos);
1280 fput_light(file, fput_needed);
1281 return ret;
1282 }
1283
1284 asmlinkage ssize_t
1285 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1286 unsigned long vlen, u32 pos_low, u32 pos_high)
1287 {
1288 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1289 struct file *file;
1290 int fput_needed;
1291 ssize_t ret;
1292
1293 if (pos < 0)
1294 return -EINVAL;
1295 file = fget_light(fd, &fput_needed);
1296 if (!file)
1297 return -EBADF;
1298 ret = compat_writev(file, vec, vlen, &pos);
1299 fput_light(file, fput_needed);
1300 return ret;
1301 }
1302
1303 asmlinkage long
1304 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1305 unsigned int nr_segs, unsigned int flags)
1306 {
1307 unsigned i;
1308 struct iovec __user *iov;
1309 if (nr_segs > UIO_MAXIOV)
1310 return -EINVAL;
1311 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1312 for (i = 0; i < nr_segs; i++) {
1313 struct compat_iovec v;
1314 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1315 get_user(v.iov_len, &iov32[i].iov_len) ||
1316 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1317 put_user(v.iov_len, &iov[i].iov_len))
1318 return -EFAULT;
1319 }
1320 return sys_vmsplice(fd, iov, nr_segs, flags);
1321 }
1322
1323 /*
1324 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1325 * O_LARGEFILE flag.
1326 */
1327 asmlinkage long
1328 compat_sys_open(const char __user *filename, int flags, int mode)
1329 {
1330 return do_sys_open(AT_FDCWD, filename, flags, mode);
1331 }
1332
1333 /*
1334 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1335 * O_LARGEFILE flag.
1336 */
1337 asmlinkage long
1338 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1339 {
1340 return do_sys_open(dfd, filename, flags, mode);
1341 }
1342
1343 /*
1344 * compat_count() counts the number of arguments/envelopes. It is basically
1345 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1346 * and envp pointers.
1347 */
1348 static int compat_count(compat_uptr_t __user *argv, int max)
1349 {
1350 int i = 0;
1351
1352 if (argv != NULL) {
1353 for (;;) {
1354 compat_uptr_t p;
1355
1356 if (get_user(p, argv))
1357 return -EFAULT;
1358 if (!p)
1359 break;
1360 argv++;
1361 if (i++ >= max)
1362 return -E2BIG;
1363 }
1364 }
1365 return i;
1366 }
1367
1368 /*
1369 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1370 * except that it works with 32 bit argv and envp pointers.
1371 */
1372 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1373 struct linux_binprm *bprm)
1374 {
1375 struct page *kmapped_page = NULL;
1376 char *kaddr = NULL;
1377 unsigned long kpos = 0;
1378 int ret;
1379
1380 while (argc-- > 0) {
1381 compat_uptr_t str;
1382 int len;
1383 unsigned long pos;
1384
1385 if (get_user(str, argv+argc) ||
1386 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1387 ret = -EFAULT;
1388 goto out;
1389 }
1390
1391 if (len > MAX_ARG_STRLEN) {
1392 ret = -E2BIG;
1393 goto out;
1394 }
1395
1396 /* We're going to work our way backwords. */
1397 pos = bprm->p;
1398 str += len;
1399 bprm->p -= len;
1400
1401 while (len > 0) {
1402 int offset, bytes_to_copy;
1403
1404 offset = pos % PAGE_SIZE;
1405 if (offset == 0)
1406 offset = PAGE_SIZE;
1407
1408 bytes_to_copy = offset;
1409 if (bytes_to_copy > len)
1410 bytes_to_copy = len;
1411
1412 offset -= bytes_to_copy;
1413 pos -= bytes_to_copy;
1414 str -= bytes_to_copy;
1415 len -= bytes_to_copy;
1416
1417 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1418 struct page *page;
1419
1420 #ifdef CONFIG_STACK_GROWSUP
1421 ret = expand_stack_downwards(bprm->vma, pos);
1422 if (ret < 0) {
1423 /* We've exceed the stack rlimit. */
1424 ret = -E2BIG;
1425 goto out;
1426 }
1427 #endif
1428 ret = get_user_pages(current, bprm->mm, pos,
1429 1, 1, 1, &page, NULL);
1430 if (ret <= 0) {
1431 /* We've exceed the stack rlimit. */
1432 ret = -E2BIG;
1433 goto out;
1434 }
1435
1436 if (kmapped_page) {
1437 flush_kernel_dcache_page(kmapped_page);
1438 kunmap(kmapped_page);
1439 put_page(kmapped_page);
1440 }
1441 kmapped_page = page;
1442 kaddr = kmap(kmapped_page);
1443 kpos = pos & PAGE_MASK;
1444 flush_cache_page(bprm->vma, kpos,
1445 page_to_pfn(kmapped_page));
1446 }
1447 if (copy_from_user(kaddr+offset, compat_ptr(str),
1448 bytes_to_copy)) {
1449 ret = -EFAULT;
1450 goto out;
1451 }
1452 }
1453 }
1454 ret = 0;
1455 out:
1456 if (kmapped_page) {
1457 flush_kernel_dcache_page(kmapped_page);
1458 kunmap(kmapped_page);
1459 put_page(kmapped_page);
1460 }
1461 return ret;
1462 }
1463
1464 /*
1465 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1466 * that it processes 32 bit argv and envp pointers.
1467 */
1468 int compat_do_execve(char * filename,
1469 compat_uptr_t __user *argv,
1470 compat_uptr_t __user *envp,
1471 struct pt_regs * regs)
1472 {
1473 struct linux_binprm *bprm;
1474 struct file *file;
1475 struct files_struct *displaced;
1476 bool clear_in_exec;
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 = -ERESTARTNOINTR;
1489 if (mutex_lock_interruptible(&current->cred_guard_mutex))
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 < 0)
1500 goto out_unlock;
1501 clear_in_exec = retval;
1502
1503 file = open_exec(filename);
1504 retval = PTR_ERR(file);
1505 if (IS_ERR(file))
1506 goto out_unmark;
1507
1508 sched_exec();
1509
1510 bprm->file = file;
1511 bprm->filename = filename;
1512 bprm->interp = filename;
1513
1514 retval = bprm_mm_init(bprm);
1515 if (retval)
1516 goto out_file;
1517
1518 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1519 if ((retval = bprm->argc) < 0)
1520 goto out;
1521
1522 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1523 if ((retval = bprm->envc) < 0)
1524 goto out;
1525
1526 retval = prepare_binprm(bprm);
1527 if (retval < 0)
1528 goto out;
1529
1530 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1531 if (retval < 0)
1532 goto out;
1533
1534 bprm->exec = bprm->p;
1535 retval = compat_copy_strings(bprm->envc, envp, bprm);
1536 if (retval < 0)
1537 goto out;
1538
1539 retval = compat_copy_strings(bprm->argc, argv, bprm);
1540 if (retval < 0)
1541 goto out;
1542
1543 retval = search_binary_handler(bprm, regs);
1544 if (retval < 0)
1545 goto out;
1546
1547 /* execve succeeded */
1548 current->fs->in_exec = 0;
1549 current->in_execve = 0;
1550 mutex_unlock(&current->cred_guard_mutex);
1551 acct_update_integrals(current);
1552 free_bprm(bprm);
1553 if (displaced)
1554 put_files_struct(displaced);
1555 return retval;
1556
1557 out:
1558 if (bprm->mm)
1559 mmput(bprm->mm);
1560
1561 out_file:
1562 if (bprm->file) {
1563 allow_write_access(bprm->file);
1564 fput(bprm->file);
1565 }
1566
1567 out_unmark:
1568 if (clear_in_exec)
1569 current->fs->in_exec = 0;
1570
1571 out_unlock:
1572 current->in_execve = 0;
1573 mutex_unlock(&current->cred_guard_mutex);
1574
1575 out_free:
1576 free_bprm(bprm);
1577
1578 out_files:
1579 if (displaced)
1580 reset_files_struct(displaced);
1581 out_ret:
1582 return retval;
1583 }
1584
1585 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1586
1587 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1588 int timeval, int ret)
1589 {
1590 struct timespec ts;
1591
1592 if (!p)
1593 return ret;
1594
1595 if (current->personality & STICKY_TIMEOUTS)
1596 goto sticky;
1597
1598 /* No update for zero timeout */
1599 if (!end_time->tv_sec && !end_time->tv_nsec)
1600 return ret;
1601
1602 ktime_get_ts(&ts);
1603 ts = timespec_sub(*end_time, ts);
1604 if (ts.tv_sec < 0)
1605 ts.tv_sec = ts.tv_nsec = 0;
1606
1607 if (timeval) {
1608 struct compat_timeval rtv;
1609
1610 rtv.tv_sec = ts.tv_sec;
1611 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1612
1613 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1614 return ret;
1615 } else {
1616 struct compat_timespec rts;
1617
1618 rts.tv_sec = ts.tv_sec;
1619 rts.tv_nsec = ts.tv_nsec;
1620
1621 if (!copy_to_user(p, &rts, sizeof(rts)))
1622 return ret;
1623 }
1624 /*
1625 * If an application puts its timeval in read-only memory, we
1626 * don't want the Linux-specific update to the timeval to
1627 * cause a fault after the select has completed
1628 * successfully. However, because we're not updating the
1629 * timeval, we can't restart the system call.
1630 */
1631
1632 sticky:
1633 if (ret == -ERESTARTNOHAND)
1634 ret = -EINTR;
1635 return ret;
1636 }
1637
1638 /*
1639 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1640 * 64-bit unsigned longs.
1641 */
1642 static
1643 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1644 unsigned long *fdset)
1645 {
1646 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1647 if (ufdset) {
1648 unsigned long odd;
1649
1650 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1651 return -EFAULT;
1652
1653 odd = nr & 1UL;
1654 nr &= ~1UL;
1655 while (nr) {
1656 unsigned long h, l;
1657 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1658 return -EFAULT;
1659 ufdset += 2;
1660 *fdset++ = h << 32 | l;
1661 nr -= 2;
1662 }
1663 if (odd && __get_user(*fdset, ufdset))
1664 return -EFAULT;
1665 } else {
1666 /* Tricky, must clear full unsigned long in the
1667 * kernel fdset at the end, this makes sure that
1668 * actually happens.
1669 */
1670 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1671 }
1672 return 0;
1673 }
1674
1675 static
1676 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1677 unsigned long *fdset)
1678 {
1679 unsigned long odd;
1680 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1681
1682 if (!ufdset)
1683 return 0;
1684
1685 odd = nr & 1UL;
1686 nr &= ~1UL;
1687 while (nr) {
1688 unsigned long h, l;
1689 l = *fdset++;
1690 h = l >> 32;
1691 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1692 return -EFAULT;
1693 ufdset += 2;
1694 nr -= 2;
1695 }
1696 if (odd && __put_user(*fdset, ufdset))
1697 return -EFAULT;
1698 return 0;
1699 }
1700
1701
1702 /*
1703 * This is a virtual copy of sys_select from fs/select.c and probably
1704 * should be compared to it from time to time
1705 */
1706
1707 /*
1708 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1709 * like to be certain this leads to no problems. So I return
1710 * EINTR just for safety.
1711 *
1712 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1713 * I'm trying ERESTARTNOHAND which restart only when you want to.
1714 */
1715 #define MAX_SELECT_SECONDS \
1716 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1717
1718 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1719 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1720 struct timespec *end_time)
1721 {
1722 fd_set_bits fds;
1723 void *bits;
1724 int size, max_fds, ret = -EINVAL;
1725 struct fdtable *fdt;
1726 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1727
1728 if (n < 0)
1729 goto out_nofds;
1730
1731 /* max_fds can increase, so grab it once to avoid race */
1732 rcu_read_lock();
1733 fdt = files_fdtable(current->files);
1734 max_fds = fdt->max_fds;
1735 rcu_read_unlock();
1736 if (n > max_fds)
1737 n = max_fds;
1738
1739 /*
1740 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1741 * since we used fdset we need to allocate memory in units of
1742 * long-words.
1743 */
1744 size = FDS_BYTES(n);
1745 bits = stack_fds;
1746 if (size > sizeof(stack_fds) / 6) {
1747 bits = kmalloc(6 * size, GFP_KERNEL);
1748 ret = -ENOMEM;
1749 if (!bits)
1750 goto out_nofds;
1751 }
1752 fds.in = (unsigned long *) bits;
1753 fds.out = (unsigned long *) (bits + size);
1754 fds.ex = (unsigned long *) (bits + 2*size);
1755 fds.res_in = (unsigned long *) (bits + 3*size);
1756 fds.res_out = (unsigned long *) (bits + 4*size);
1757 fds.res_ex = (unsigned long *) (bits + 5*size);
1758
1759 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1760 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1761 (ret = compat_get_fd_set(n, exp, fds.ex)))
1762 goto out;
1763 zero_fd_set(n, fds.res_in);
1764 zero_fd_set(n, fds.res_out);
1765 zero_fd_set(n, fds.res_ex);
1766
1767 ret = do_select(n, &fds, end_time);
1768
1769 if (ret < 0)
1770 goto out;
1771 if (!ret) {
1772 ret = -ERESTARTNOHAND;
1773 if (signal_pending(current))
1774 goto out;
1775 ret = 0;
1776 }
1777
1778 if (compat_set_fd_set(n, inp, fds.res_in) ||
1779 compat_set_fd_set(n, outp, fds.res_out) ||
1780 compat_set_fd_set(n, exp, fds.res_ex))
1781 ret = -EFAULT;
1782 out:
1783 if (bits != stack_fds)
1784 kfree(bits);
1785 out_nofds:
1786 return ret;
1787 }
1788
1789 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1790 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1791 struct compat_timeval __user *tvp)
1792 {
1793 struct timespec end_time, *to = NULL;
1794 struct compat_timeval tv;
1795 int ret;
1796
1797 if (tvp) {
1798 if (copy_from_user(&tv, tvp, sizeof(tv)))
1799 return -EFAULT;
1800
1801 to = &end_time;
1802 if (poll_select_set_timeout(to,
1803 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1804 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1805 return -EINVAL;
1806 }
1807
1808 ret = compat_core_sys_select(n, inp, outp, exp, to);
1809 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1810
1811 return ret;
1812 }
1813
1814 #ifdef HAVE_SET_RESTORE_SIGMASK
1815 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1816 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1817 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1818 compat_size_t sigsetsize)
1819 {
1820 compat_sigset_t ss32;
1821 sigset_t ksigmask, sigsaved;
1822 struct compat_timespec ts;
1823 struct timespec end_time, *to = NULL;
1824 int ret;
1825
1826 if (tsp) {
1827 if (copy_from_user(&ts, tsp, sizeof(ts)))
1828 return -EFAULT;
1829
1830 to = &end_time;
1831 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1832 return -EINVAL;
1833 }
1834
1835 if (sigmask) {
1836 if (sigsetsize != sizeof(compat_sigset_t))
1837 return -EINVAL;
1838 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1839 return -EFAULT;
1840 sigset_from_compat(&ksigmask, &ss32);
1841
1842 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1843 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1844 }
1845
1846 ret = compat_core_sys_select(n, inp, outp, exp, to);
1847 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1848
1849 if (ret == -ERESTARTNOHAND) {
1850 /*
1851 * Don't restore the signal mask yet. Let do_signal() deliver
1852 * the signal on the way back to userspace, before the signal
1853 * mask is restored.
1854 */
1855 if (sigmask) {
1856 memcpy(&current->saved_sigmask, &sigsaved,
1857 sizeof(sigsaved));
1858 set_restore_sigmask();
1859 }
1860 } else if (sigmask)
1861 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1862
1863 return ret;
1864 }
1865
1866 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1867 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1868 struct compat_timespec __user *tsp, void __user *sig)
1869 {
1870 compat_size_t sigsetsize = 0;
1871 compat_uptr_t up = 0;
1872
1873 if (sig) {
1874 if (!access_ok(VERIFY_READ, sig,
1875 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1876 __get_user(up, (compat_uptr_t __user *)sig) ||
1877 __get_user(sigsetsize,
1878 (compat_size_t __user *)(sig+sizeof(up))))
1879 return -EFAULT;
1880 }
1881 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1882 sigsetsize);
1883 }
1884
1885 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1886 unsigned int nfds, struct compat_timespec __user *tsp,
1887 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1888 {
1889 compat_sigset_t ss32;
1890 sigset_t ksigmask, sigsaved;
1891 struct compat_timespec ts;
1892 struct timespec end_time, *to = NULL;
1893 int ret;
1894
1895 if (tsp) {
1896 if (copy_from_user(&ts, tsp, sizeof(ts)))
1897 return -EFAULT;
1898
1899 to = &end_time;
1900 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1901 return -EINVAL;
1902 }
1903
1904 if (sigmask) {
1905 if (sigsetsize != sizeof(compat_sigset_t))
1906 return -EINVAL;
1907 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1908 return -EFAULT;
1909 sigset_from_compat(&ksigmask, &ss32);
1910
1911 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1912 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1913 }
1914
1915 ret = do_sys_poll(ufds, nfds, to);
1916
1917 /* We can restart this syscall, usually */
1918 if (ret == -EINTR) {
1919 /*
1920 * Don't restore the signal mask yet. Let do_signal() deliver
1921 * the signal on the way back to userspace, before the signal
1922 * mask is restored.
1923 */
1924 if (sigmask) {
1925 memcpy(&current->saved_sigmask, &sigsaved,
1926 sizeof(sigsaved));
1927 set_restore_sigmask();
1928 }
1929 ret = -ERESTARTNOHAND;
1930 } else if (sigmask)
1931 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1932
1933 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1934
1935 return ret;
1936 }
1937 #endif /* HAVE_SET_RESTORE_SIGMASK */
1938
1939 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1940 /* Stuff for NFS server syscalls... */
1941 struct compat_nfsctl_svc {
1942 u16 svc32_port;
1943 s32 svc32_nthreads;
1944 };
1945
1946 struct compat_nfsctl_client {
1947 s8 cl32_ident[NFSCLNT_IDMAX+1];
1948 s32 cl32_naddr;
1949 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1950 s32 cl32_fhkeytype;
1951 s32 cl32_fhkeylen;
1952 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1953 };
1954
1955 struct compat_nfsctl_export {
1956 char ex32_client[NFSCLNT_IDMAX+1];
1957 char ex32_path[NFS_MAXPATHLEN+1];
1958 compat_dev_t ex32_dev;
1959 compat_ino_t ex32_ino;
1960 compat_int_t ex32_flags;
1961 __compat_uid_t ex32_anon_uid;
1962 __compat_gid_t ex32_anon_gid;
1963 };
1964
1965 struct compat_nfsctl_fdparm {
1966 struct sockaddr gd32_addr;
1967 s8 gd32_path[NFS_MAXPATHLEN+1];
1968 compat_int_t gd32_version;
1969 };
1970
1971 struct compat_nfsctl_fsparm {
1972 struct sockaddr gd32_addr;
1973 s8 gd32_path[NFS_MAXPATHLEN+1];
1974 compat_int_t gd32_maxlen;
1975 };
1976
1977 struct compat_nfsctl_arg {
1978 compat_int_t ca32_version; /* safeguard */
1979 union {
1980 struct compat_nfsctl_svc u32_svc;
1981 struct compat_nfsctl_client u32_client;
1982 struct compat_nfsctl_export u32_export;
1983 struct compat_nfsctl_fdparm u32_getfd;
1984 struct compat_nfsctl_fsparm u32_getfs;
1985 } u;
1986 #define ca32_svc u.u32_svc
1987 #define ca32_client u.u32_client
1988 #define ca32_export u.u32_export
1989 #define ca32_getfd u.u32_getfd
1990 #define ca32_getfs u.u32_getfs
1991 };
1992
1993 union compat_nfsctl_res {
1994 __u8 cr32_getfh[NFS_FHSIZE];
1995 struct knfsd_fh cr32_getfs;
1996 };
1997
1998 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1999 struct compat_nfsctl_arg __user *arg)
2000 {
2001 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2002 get_user(karg->ca_version, &arg->ca32_version) ||
2003 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2004 __get_user(karg->ca_svc.svc_nthreads,
2005 &arg->ca32_svc.svc32_nthreads))
2006 return -EFAULT;
2007 return 0;
2008 }
2009
2010 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2011 struct compat_nfsctl_arg __user *arg)
2012 {
2013 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2014 sizeof(arg->ca32_client)) ||
2015 get_user(karg->ca_version, &arg->ca32_version) ||
2016 __copy_from_user(&karg->ca_client.cl_ident[0],
2017 &arg->ca32_client.cl32_ident[0],
2018 NFSCLNT_IDMAX) ||
2019 __get_user(karg->ca_client.cl_naddr,
2020 &arg->ca32_client.cl32_naddr) ||
2021 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2022 &arg->ca32_client.cl32_addrlist[0],
2023 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2024 __get_user(karg->ca_client.cl_fhkeytype,
2025 &arg->ca32_client.cl32_fhkeytype) ||
2026 __get_user(karg->ca_client.cl_fhkeylen,
2027 &arg->ca32_client.cl32_fhkeylen) ||
2028 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2029 &arg->ca32_client.cl32_fhkey[0],
2030 NFSCLNT_KEYMAX))
2031 return -EFAULT;
2032
2033 return 0;
2034 }
2035
2036 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2037 struct compat_nfsctl_arg __user *arg)
2038 {
2039 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2040 sizeof(arg->ca32_export)) ||
2041 get_user(karg->ca_version, &arg->ca32_version) ||
2042 __copy_from_user(&karg->ca_export.ex_client[0],
2043 &arg->ca32_export.ex32_client[0],
2044 NFSCLNT_IDMAX) ||
2045 __copy_from_user(&karg->ca_export.ex_path[0],
2046 &arg->ca32_export.ex32_path[0],
2047 NFS_MAXPATHLEN) ||
2048 __get_user(karg->ca_export.ex_dev,
2049 &arg->ca32_export.ex32_dev) ||
2050 __get_user(karg->ca_export.ex_ino,
2051 &arg->ca32_export.ex32_ino) ||
2052 __get_user(karg->ca_export.ex_flags,
2053 &arg->ca32_export.ex32_flags) ||
2054 __get_user(karg->ca_export.ex_anon_uid,
2055 &arg->ca32_export.ex32_anon_uid) ||
2056 __get_user(karg->ca_export.ex_anon_gid,
2057 &arg->ca32_export.ex32_anon_gid))
2058 return -EFAULT;
2059 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2060 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2061
2062 return 0;
2063 }
2064
2065 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2066 struct compat_nfsctl_arg __user *arg)
2067 {
2068 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2069 sizeof(arg->ca32_getfd)) ||
2070 get_user(karg->ca_version, &arg->ca32_version) ||
2071 __copy_from_user(&karg->ca_getfd.gd_addr,
2072 &arg->ca32_getfd.gd32_addr,
2073 (sizeof(struct sockaddr))) ||
2074 __copy_from_user(&karg->ca_getfd.gd_path,
2075 &arg->ca32_getfd.gd32_path,
2076 (NFS_MAXPATHLEN+1)) ||
2077 __get_user(karg->ca_getfd.gd_version,
2078 &arg->ca32_getfd.gd32_version))
2079 return -EFAULT;
2080
2081 return 0;
2082 }
2083
2084 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2085 struct compat_nfsctl_arg __user *arg)
2086 {
2087 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2088 get_user(karg->ca_version, &arg->ca32_version) ||
2089 __copy_from_user(&karg->ca_getfs.gd_addr,
2090 &arg->ca32_getfs.gd32_addr,
2091 (sizeof(struct sockaddr))) ||
2092 __copy_from_user(&karg->ca_getfs.gd_path,
2093 &arg->ca32_getfs.gd32_path,
2094 (NFS_MAXPATHLEN+1)) ||
2095 __get_user(karg->ca_getfs.gd_maxlen,
2096 &arg->ca32_getfs.gd32_maxlen))
2097 return -EFAULT;
2098
2099 return 0;
2100 }
2101
2102 /* This really doesn't need translations, we are only passing
2103 * back a union which contains opaque nfs file handle data.
2104 */
2105 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2106 union compat_nfsctl_res __user *res)
2107 {
2108 int err;
2109
2110 err = copy_to_user(res, kres, sizeof(*res));
2111
2112 return (err) ? -EFAULT : 0;
2113 }
2114
2115 asmlinkage long compat_sys_nfsservctl(int cmd,
2116 struct compat_nfsctl_arg __user *arg,
2117 union compat_nfsctl_res __user *res)
2118 {
2119 struct nfsctl_arg *karg;
2120 union nfsctl_res *kres;
2121 mm_segment_t oldfs;
2122 int err;
2123
2124 karg = kmalloc(sizeof(*karg), GFP_USER);
2125 kres = kmalloc(sizeof(*kres), GFP_USER);
2126 if(!karg || !kres) {
2127 err = -ENOMEM;
2128 goto done;
2129 }
2130
2131 switch(cmd) {
2132 case NFSCTL_SVC:
2133 err = compat_nfs_svc_trans(karg, arg);
2134 break;
2135
2136 case NFSCTL_ADDCLIENT:
2137 err = compat_nfs_clnt_trans(karg, arg);
2138 break;
2139
2140 case NFSCTL_DELCLIENT:
2141 err = compat_nfs_clnt_trans(karg, arg);
2142 break;
2143
2144 case NFSCTL_EXPORT:
2145 case NFSCTL_UNEXPORT:
2146 err = compat_nfs_exp_trans(karg, arg);
2147 break;
2148
2149 case NFSCTL_GETFD:
2150 err = compat_nfs_getfd_trans(karg, arg);
2151 break;
2152
2153 case NFSCTL_GETFS:
2154 err = compat_nfs_getfs_trans(karg, arg);
2155 break;
2156
2157 default:
2158 err = -EINVAL;
2159 break;
2160 }
2161
2162 if (err)
2163 goto done;
2164
2165 oldfs = get_fs();
2166 set_fs(KERNEL_DS);
2167 /* The __user pointer casts are valid because of the set_fs() */
2168 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2169 set_fs(oldfs);
2170
2171 if (err)
2172 goto done;
2173
2174 if((cmd == NFSCTL_GETFD) ||
2175 (cmd == NFSCTL_GETFS))
2176 err = compat_nfs_getfh_res_trans(kres, res);
2177
2178 done:
2179 kfree(karg);
2180 kfree(kres);
2181 return err;
2182 }
2183 #else /* !NFSD */
2184 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2185 {
2186 return sys_ni_syscall();
2187 }
2188 #endif
2189
2190 #ifdef CONFIG_EPOLL
2191
2192 #ifdef HAVE_SET_RESTORE_SIGMASK
2193 asmlinkage long compat_sys_epoll_pwait(int epfd,
2194 struct compat_epoll_event __user *events,
2195 int maxevents, int timeout,
2196 const compat_sigset_t __user *sigmask,
2197 compat_size_t sigsetsize)
2198 {
2199 long err;
2200 compat_sigset_t csigmask;
2201 sigset_t ksigmask, sigsaved;
2202
2203 /*
2204 * If the caller wants a certain signal mask to be set during the wait,
2205 * we apply it here.
2206 */
2207 if (sigmask) {
2208 if (sigsetsize != sizeof(compat_sigset_t))
2209 return -EINVAL;
2210 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2211 return -EFAULT;
2212 sigset_from_compat(&ksigmask, &csigmask);
2213 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2214 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2215 }
2216
2217 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2218
2219 /*
2220 * If we changed the signal mask, we need to restore the original one.
2221 * In case we've got a signal while waiting, we do not restore the
2222 * signal mask yet, and we allow do_signal() to deliver the signal on
2223 * the way back to userspace, before the signal mask is restored.
2224 */
2225 if (sigmask) {
2226 if (err == -EINTR) {
2227 memcpy(&current->saved_sigmask, &sigsaved,
2228 sizeof(sigsaved));
2229 set_restore_sigmask();
2230 } else
2231 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2232 }
2233
2234 return err;
2235 }
2236 #endif /* HAVE_SET_RESTORE_SIGMASK */
2237
2238 #endif /* CONFIG_EPOLL */
2239
2240 #ifdef CONFIG_SIGNALFD
2241
2242 asmlinkage long compat_sys_signalfd4(int ufd,
2243 const compat_sigset_t __user *sigmask,
2244 compat_size_t sigsetsize, int flags)
2245 {
2246 compat_sigset_t ss32;
2247 sigset_t tmp;
2248 sigset_t __user *ksigmask;
2249
2250 if (sigsetsize != sizeof(compat_sigset_t))
2251 return -EINVAL;
2252 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2253 return -EFAULT;
2254 sigset_from_compat(&tmp, &ss32);
2255 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2256 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2257 return -EFAULT;
2258
2259 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2260 }
2261
2262 asmlinkage long compat_sys_signalfd(int ufd,
2263 const compat_sigset_t __user *sigmask,
2264 compat_size_t sigsetsize)
2265 {
2266 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2267 }
2268 #endif /* CONFIG_SIGNALFD */
2269
2270 #ifdef CONFIG_TIMERFD
2271
2272 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2273 const struct compat_itimerspec __user *utmr,
2274 struct compat_itimerspec __user *otmr)
2275 {
2276 int error;
2277 struct itimerspec t;
2278 struct itimerspec __user *ut;
2279
2280 if (get_compat_itimerspec(&t, utmr))
2281 return -EFAULT;
2282 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2283 if (copy_to_user(&ut[0], &t, sizeof(t)))
2284 return -EFAULT;
2285 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2286 if (!error && otmr)
2287 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2288 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2289
2290 return error;
2291 }
2292
2293 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2294 struct compat_itimerspec __user *otmr)
2295 {
2296 int error;
2297 struct itimerspec t;
2298 struct itimerspec __user *ut;
2299
2300 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2301 error = sys_timerfd_gettime(ufd, ut);
2302 if (!error)
2303 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2304 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2305
2306 return error;
2307 }
2308
2309 #endif /* CONFIG_TIMERFD */
Support for the Chinese Samsung S3C2440 based development boards