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autofs4: don't make expiring dentry negative
[linux-2.6.git] / fs / compat.c
blob106eba28ec5a8c7a4f05f906f9fea1f7fd421c5c
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/smp_lock.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/nfsd/nfsd.h>
44 #include <linux/nfsd/syscall.h>
45 #include <linux/personality.h>
46 #include <linux/rwsem.h>
47 #include <linux/tsacct_kern.h>
48 #include <linux/security.h>
49 #include <linux/highmem.h>
50 #include <linux/signal.h>
51 #include <linux/poll.h>
52 #include <linux/mm.h>
53 #include <linux/eventpoll.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
104 && tv[0].tv_sec != 0)
105 return -EINVAL;
106 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107 && tv[1].tv_sec != 0)
108 return -EINVAL;
109
110 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111 return 0;
112 }
113 return do_utimes(dfd, filename, t ? tv : NULL, flags);
114 }
115
116 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
117 {
118 struct timespec tv[2];
119
120 if (t) {
121 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
122 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
123 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
124 get_user(tv[1].tv_nsec, &t[1].tv_usec))
125 return -EFAULT;
126 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128 return -EINVAL;
129 tv[0].tv_nsec *= 1000;
130 tv[1].tv_nsec *= 1000;
131 }
132 return do_utimes(dfd, filename, t ? tv : NULL, 0);
133 }
134
135 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136 {
137 return compat_sys_futimesat(AT_FDCWD, filename, t);
138 }
139
140 asmlinkage long compat_sys_newstat(char __user * filename,
141 struct compat_stat __user *statbuf)
142 {
143 struct kstat stat;
144 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
145
146 if (!error)
147 error = cp_compat_stat(&stat, statbuf);
148 return error;
149 }
150
151 asmlinkage long compat_sys_newlstat(char __user * filename,
152 struct compat_stat __user *statbuf)
153 {
154 struct kstat stat;
155 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
156
157 if (!error)
158 error = cp_compat_stat(&stat, statbuf);
159 return error;
160 }
161
162 #ifndef __ARCH_WANT_STAT64
163 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
164 struct compat_stat __user *statbuf, int flag)
165 {
166 struct kstat stat;
167 int error = -EINVAL;
168
169 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
170 goto out;
171
172 if (flag & AT_SYMLINK_NOFOLLOW)
173 error = vfs_lstat_fd(dfd, filename, &stat);
174 else
175 error = vfs_stat_fd(dfd, filename, &stat);
176
177 if (!error)
178 error = cp_compat_stat(&stat, statbuf);
179
180 out:
181 return error;
182 }
183 #endif
184
185 asmlinkage long compat_sys_newfstat(unsigned int fd,
186 struct compat_stat __user * statbuf)
187 {
188 struct kstat stat;
189 int error = vfs_fstat(fd, &stat);
190
191 if (!error)
192 error = cp_compat_stat(&stat, statbuf);
193 return error;
194 }
195
196 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
197 {
198
199 if (sizeof ubuf->f_blocks == 4) {
200 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
201 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
202 return -EOVERFLOW;
203 /* f_files and f_ffree may be -1; it's okay
204 * to stuff that into 32 bits */
205 if (kbuf->f_files != 0xffffffffffffffffULL
206 && (kbuf->f_files & 0xffffffff00000000ULL))
207 return -EOVERFLOW;
208 if (kbuf->f_ffree != 0xffffffffffffffffULL
209 && (kbuf->f_ffree & 0xffffffff00000000ULL))
210 return -EOVERFLOW;
211 }
212 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
213 __put_user(kbuf->f_type, &ubuf->f_type) ||
214 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
215 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
216 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
217 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
218 __put_user(kbuf->f_files, &ubuf->f_files) ||
219 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
220 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
221 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
222 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
223 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
224 __put_user(0, &ubuf->f_spare[0]) ||
225 __put_user(0, &ubuf->f_spare[1]) ||
226 __put_user(0, &ubuf->f_spare[2]) ||
227 __put_user(0, &ubuf->f_spare[3]) ||
228 __put_user(0, &ubuf->f_spare[4]))
229 return -EFAULT;
230 return 0;
231 }
232
233 /*
234 * The following statfs calls are copies of code from fs/open.c and
235 * should be checked against those from time to time
236 */
237 asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
238 {
239 struct nameidata nd;
240 int error;
241
242 error = user_path_walk(path, &nd);
243 if (!error) {
244 struct kstatfs tmp;
245 error = vfs_statfs(nd.path.dentry, &tmp);
246 if (!error)
247 error = put_compat_statfs(buf, &tmp);
248 path_put(&nd.path);
249 }
250 return error;
251 }
252
253 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
254 {
255 struct file * file;
256 struct kstatfs tmp;
257 int error;
258
259 error = -EBADF;
260 file = fget(fd);
261 if (!file)
262 goto out;
263 error = vfs_statfs(file->f_path.dentry, &tmp);
264 if (!error)
265 error = put_compat_statfs(buf, &tmp);
266 fput(file);
267 out:
268 return error;
269 }
270
271 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
272 {
273 if (sizeof ubuf->f_blocks == 4) {
274 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
275 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
276 return -EOVERFLOW;
277 /* f_files and f_ffree may be -1; it's okay
278 * to stuff that into 32 bits */
279 if (kbuf->f_files != 0xffffffffffffffffULL
280 && (kbuf->f_files & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 if (kbuf->f_ffree != 0xffffffffffffffffULL
283 && (kbuf->f_ffree & 0xffffffff00000000ULL))
284 return -EOVERFLOW;
285 }
286 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
287 __put_user(kbuf->f_type, &ubuf->f_type) ||
288 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
289 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
290 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
291 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
292 __put_user(kbuf->f_files, &ubuf->f_files) ||
293 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
294 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
295 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
296 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
297 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
298 return -EFAULT;
299 return 0;
300 }
301
302 asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
303 {
304 struct nameidata nd;
305 int error;
306
307 if (sz != sizeof(*buf))
308 return -EINVAL;
309
310 error = user_path_walk(path, &nd);
311 if (!error) {
312 struct kstatfs tmp;
313 error = vfs_statfs(nd.path.dentry, &tmp);
314 if (!error)
315 error = put_compat_statfs64(buf, &tmp);
316 path_put(&nd.path);
317 }
318 return error;
319 }
320
321 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
322 {
323 struct file * file;
324 struct kstatfs tmp;
325 int error;
326
327 if (sz != sizeof(*buf))
328 return -EINVAL;
329
330 error = -EBADF;
331 file = fget(fd);
332 if (!file)
333 goto out;
334 error = vfs_statfs(file->f_path.dentry, &tmp);
335 if (!error)
336 error = put_compat_statfs64(buf, &tmp);
337 fput(file);
338 out:
339 return error;
340 }
341
342 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
343 {
344 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
345 __get_user(kfl->l_type, &ufl->l_type) ||
346 __get_user(kfl->l_whence, &ufl->l_whence) ||
347 __get_user(kfl->l_start, &ufl->l_start) ||
348 __get_user(kfl->l_len, &ufl->l_len) ||
349 __get_user(kfl->l_pid, &ufl->l_pid))
350 return -EFAULT;
351 return 0;
352 }
353
354 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
355 {
356 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
357 __put_user(kfl->l_type, &ufl->l_type) ||
358 __put_user(kfl->l_whence, &ufl->l_whence) ||
359 __put_user(kfl->l_start, &ufl->l_start) ||
360 __put_user(kfl->l_len, &ufl->l_len) ||
361 __put_user(kfl->l_pid, &ufl->l_pid))
362 return -EFAULT;
363 return 0;
364 }
365
366 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
367 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
368 {
369 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
370 __get_user(kfl->l_type, &ufl->l_type) ||
371 __get_user(kfl->l_whence, &ufl->l_whence) ||
372 __get_user(kfl->l_start, &ufl->l_start) ||
373 __get_user(kfl->l_len, &ufl->l_len) ||
374 __get_user(kfl->l_pid, &ufl->l_pid))
375 return -EFAULT;
376 return 0;
377 }
378 #endif
379
380 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
381 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
382 {
383 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
384 __put_user(kfl->l_type, &ufl->l_type) ||
385 __put_user(kfl->l_whence, &ufl->l_whence) ||
386 __put_user(kfl->l_start, &ufl->l_start) ||
387 __put_user(kfl->l_len, &ufl->l_len) ||
388 __put_user(kfl->l_pid, &ufl->l_pid))
389 return -EFAULT;
390 return 0;
391 }
392 #endif
393
394 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
395 unsigned long arg)
396 {
397 mm_segment_t old_fs;
398 struct flock f;
399 long ret;
400
401 switch (cmd) {
402 case F_GETLK:
403 case F_SETLK:
404 case F_SETLKW:
405 ret = get_compat_flock(&f, compat_ptr(arg));
406 if (ret != 0)
407 break;
408 old_fs = get_fs();
409 set_fs(KERNEL_DS);
410 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
411 set_fs(old_fs);
412 if (cmd == F_GETLK && ret == 0) {
413 /* GETLK was successfule and we need to return the data...
414 * but it needs to fit in the compat structure.
415 * l_start shouldn't be too big, unless the original
416 * start + end is greater than COMPAT_OFF_T_MAX, in which
417 * case the app was asking for trouble, so we return
418 * -EOVERFLOW in that case.
419 * l_len could be too big, in which case we just truncate it,
420 * and only allow the app to see that part of the conflicting
421 * lock that might make sense to it anyway
422 */
423
424 if (f.l_start > COMPAT_OFF_T_MAX)
425 ret = -EOVERFLOW;
426 if (f.l_len > COMPAT_OFF_T_MAX)
427 f.l_len = COMPAT_OFF_T_MAX;
428 if (ret == 0)
429 ret = put_compat_flock(&f, compat_ptr(arg));
430 }
431 break;
432
433 case F_GETLK64:
434 case F_SETLK64:
435 case F_SETLKW64:
436 ret = get_compat_flock64(&f, compat_ptr(arg));
437 if (ret != 0)
438 break;
439 old_fs = get_fs();
440 set_fs(KERNEL_DS);
441 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
442 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
443 (unsigned long)&f);
444 set_fs(old_fs);
445 if (cmd == F_GETLK64 && ret == 0) {
446 /* need to return lock information - see above for commentary */
447 if (f.l_start > COMPAT_LOFF_T_MAX)
448 ret = -EOVERFLOW;
449 if (f.l_len > COMPAT_LOFF_T_MAX)
450 f.l_len = COMPAT_LOFF_T_MAX;
451 if (ret == 0)
452 ret = put_compat_flock64(&f, compat_ptr(arg));
453 }
454 break;
455
456 default:
457 ret = sys_fcntl(fd, cmd, arg);
458 break;
459 }
460 return ret;
461 }
462
463 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
464 unsigned long arg)
465 {
466 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
467 return -EINVAL;
468 return compat_sys_fcntl64(fd, cmd, arg);
469 }
470
471 asmlinkage long
472 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
473 {
474 long ret;
475 aio_context_t ctx64;
476
477 mm_segment_t oldfs = get_fs();
478 if (unlikely(get_user(ctx64, ctx32p)))
479 return -EFAULT;
480
481 set_fs(KERNEL_DS);
482 /* The __user pointer cast is valid because of the set_fs() */
483 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
484 set_fs(oldfs);
485 /* truncating is ok because it's a user address */
486 if (!ret)
487 ret = put_user((u32) ctx64, ctx32p);
488 return ret;
489 }
490
491 asmlinkage long
492 compat_sys_io_getevents(aio_context_t ctx_id,
493 unsigned long min_nr,
494 unsigned long nr,
495 struct io_event __user *events,
496 struct compat_timespec __user *timeout)
497 {
498 long ret;
499 struct timespec t;
500 struct timespec __user *ut = NULL;
501
502 ret = -EFAULT;
503 if (unlikely(!access_ok(VERIFY_WRITE, events,
504 nr * sizeof(struct io_event))))
505 goto out;
506 if (timeout) {
507 if (get_compat_timespec(&t, timeout))
508 goto out;
509
510 ut = compat_alloc_user_space(sizeof(*ut));
511 if (copy_to_user(ut, &t, sizeof(t)) )
512 goto out;
513 }
514 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
515 out:
516 return ret;
517 }
518
519 static inline long
520 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
521 {
522 compat_uptr_t uptr;
523 int i;
524
525 for (i = 0; i < nr; ++i) {
526 if (get_user(uptr, ptr32 + i))
527 return -EFAULT;
528 if (put_user(compat_ptr(uptr), ptr64 + i))
529 return -EFAULT;
530 }
531 return 0;
532 }
533
534 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
535
536 asmlinkage long
537 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
538 {
539 struct iocb __user * __user *iocb64;
540 long ret;
541
542 if (unlikely(nr < 0))
543 return -EINVAL;
544
545 if (nr > MAX_AIO_SUBMITS)
546 nr = MAX_AIO_SUBMITS;
547
548 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
549 ret = copy_iocb(nr, iocb, iocb64);
550 if (!ret)
551 ret = sys_io_submit(ctx_id, nr, iocb64);
552 return ret;
553 }
554
555 struct compat_ncp_mount_data {
556 compat_int_t version;
557 compat_uint_t ncp_fd;
558 __compat_uid_t mounted_uid;
559 compat_pid_t wdog_pid;
560 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
561 compat_uint_t time_out;
562 compat_uint_t retry_count;
563 compat_uint_t flags;
564 __compat_uid_t uid;
565 __compat_gid_t gid;
566 compat_mode_t file_mode;
567 compat_mode_t dir_mode;
568 };
569
570 struct compat_ncp_mount_data_v4 {
571 compat_int_t version;
572 compat_ulong_t flags;
573 compat_ulong_t mounted_uid;
574 compat_long_t wdog_pid;
575 compat_uint_t ncp_fd;
576 compat_uint_t time_out;
577 compat_uint_t retry_count;
578 compat_ulong_t uid;
579 compat_ulong_t gid;
580 compat_ulong_t file_mode;
581 compat_ulong_t dir_mode;
582 };
583
584 static void *do_ncp_super_data_conv(void *raw_data)
585 {
586 int version = *(unsigned int *)raw_data;
587
588 if (version == 3) {
589 struct compat_ncp_mount_data *c_n = raw_data;
590 struct ncp_mount_data *n = raw_data;
591
592 n->dir_mode = c_n->dir_mode;
593 n->file_mode = c_n->file_mode;
594 n->gid = c_n->gid;
595 n->uid = c_n->uid;
596 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
597 n->wdog_pid = c_n->wdog_pid;
598 n->mounted_uid = c_n->mounted_uid;
599 } else if (version == 4) {
600 struct compat_ncp_mount_data_v4 *c_n = raw_data;
601 struct ncp_mount_data_v4 *n = raw_data;
602
603 n->dir_mode = c_n->dir_mode;
604 n->file_mode = c_n->file_mode;
605 n->gid = c_n->gid;
606 n->uid = c_n->uid;
607 n->retry_count = c_n->retry_count;
608 n->time_out = c_n->time_out;
609 n->ncp_fd = c_n->ncp_fd;
610 n->wdog_pid = c_n->wdog_pid;
611 n->mounted_uid = c_n->mounted_uid;
612 n->flags = c_n->flags;
613 } else if (version != 5) {
614 return NULL;
615 }
616
617 return raw_data;
618 }
619
620 struct compat_smb_mount_data {
621 compat_int_t version;
622 __compat_uid_t mounted_uid;
623 __compat_uid_t uid;
624 __compat_gid_t gid;
625 compat_mode_t file_mode;
626 compat_mode_t dir_mode;
627 };
628
629 static void *do_smb_super_data_conv(void *raw_data)
630 {
631 struct smb_mount_data *s = raw_data;
632 struct compat_smb_mount_data *c_s = raw_data;
633
634 if (c_s->version != SMB_MOUNT_OLDVERSION)
635 goto out;
636 s->dir_mode = c_s->dir_mode;
637 s->file_mode = c_s->file_mode;
638 s->gid = c_s->gid;
639 s->uid = c_s->uid;
640 s->mounted_uid = c_s->mounted_uid;
641 out:
642 return raw_data;
643 }
644
645 struct compat_nfs_string {
646 compat_uint_t len;
647 compat_uptr_t data;
648 };
649
650 static inline void compat_nfs_string(struct nfs_string *dst,
651 struct compat_nfs_string *src)
652 {
653 dst->data = compat_ptr(src->data);
654 dst->len = src->len;
655 }
656
657 struct compat_nfs4_mount_data_v1 {
658 compat_int_t version;
659 compat_int_t flags;
660 compat_int_t rsize;
661 compat_int_t wsize;
662 compat_int_t timeo;
663 compat_int_t retrans;
664 compat_int_t acregmin;
665 compat_int_t acregmax;
666 compat_int_t acdirmin;
667 compat_int_t acdirmax;
668 struct compat_nfs_string client_addr;
669 struct compat_nfs_string mnt_path;
670 struct compat_nfs_string hostname;
671 compat_uint_t host_addrlen;
672 compat_uptr_t host_addr;
673 compat_int_t proto;
674 compat_int_t auth_flavourlen;
675 compat_uptr_t auth_flavours;
676 };
677
678 static int do_nfs4_super_data_conv(void *raw_data)
679 {
680 int version = *(compat_uint_t *) raw_data;
681
682 if (version == 1) {
683 struct compat_nfs4_mount_data_v1 *raw = raw_data;
684 struct nfs4_mount_data *real = raw_data;
685
686 /* copy the fields backwards */
687 real->auth_flavours = compat_ptr(raw->auth_flavours);
688 real->auth_flavourlen = raw->auth_flavourlen;
689 real->proto = raw->proto;
690 real->host_addr = compat_ptr(raw->host_addr);
691 real->host_addrlen = raw->host_addrlen;
692 compat_nfs_string(&real->hostname, &raw->hostname);
693 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
694 compat_nfs_string(&real->client_addr, &raw->client_addr);
695 real->acdirmax = raw->acdirmax;
696 real->acdirmin = raw->acdirmin;
697 real->acregmax = raw->acregmax;
698 real->acregmin = raw->acregmin;
699 real->retrans = raw->retrans;
700 real->timeo = raw->timeo;
701 real->wsize = raw->wsize;
702 real->rsize = raw->rsize;
703 real->flags = raw->flags;
704 real->version = raw->version;
705 }
706
707 return 0;
708 }
709
710 #define SMBFS_NAME "smbfs"
711 #define NCPFS_NAME "ncpfs"
712 #define NFS4_NAME "nfs4"
713
714 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
715 char __user * type, unsigned long flags,
716 void __user * data)
717 {
718 unsigned long type_page;
719 unsigned long data_page;
720 unsigned long dev_page;
721 char *dir_page;
722 int retval;
723
724 retval = copy_mount_options (type, &type_page);
725 if (retval < 0)
726 goto out;
727
728 dir_page = getname(dir_name);
729 retval = PTR_ERR(dir_page);
730 if (IS_ERR(dir_page))
731 goto out1;
732
733 retval = copy_mount_options (dev_name, &dev_page);
734 if (retval < 0)
735 goto out2;
736
737 retval = copy_mount_options (data, &data_page);
738 if (retval < 0)
739 goto out3;
740
741 retval = -EINVAL;
742
743 if (type_page && data_page) {
744 if (!strcmp((char *)type_page, SMBFS_NAME)) {
745 do_smb_super_data_conv((void *)data_page);
746 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
747 do_ncp_super_data_conv((void *)data_page);
748 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
749 if (do_nfs4_super_data_conv((void *) data_page))
750 goto out4;
751 }
752 }
753
754 lock_kernel();
755 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
756 flags, (void*)data_page);
757 unlock_kernel();
758
759 out4:
760 free_page(data_page);
761 out3:
762 free_page(dev_page);
763 out2:
764 putname(dir_page);
765 out1:
766 free_page(type_page);
767 out:
768 return retval;
769 }
770
771 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
772
773 struct compat_old_linux_dirent {
774 compat_ulong_t d_ino;
775 compat_ulong_t d_offset;
776 unsigned short d_namlen;
777 char d_name[1];
778 };
779
780 struct compat_readdir_callback {
781 struct compat_old_linux_dirent __user *dirent;
782 int result;
783 };
784
785 static int compat_fillonedir(void *__buf, const char *name, int namlen,
786 loff_t offset, u64 ino, unsigned int d_type)
787 {
788 struct compat_readdir_callback *buf = __buf;
789 struct compat_old_linux_dirent __user *dirent;
790 compat_ulong_t d_ino;
791
792 if (buf->result)
793 return -EINVAL;
794 d_ino = ino;
795 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
796 return -EOVERFLOW;
797 buf->result++;
798 dirent = buf->dirent;
799 if (!access_ok(VERIFY_WRITE, dirent,
800 (unsigned long)(dirent->d_name + namlen + 1) -
801 (unsigned long)dirent))
802 goto efault;
803 if ( __put_user(d_ino, &dirent->d_ino) ||
804 __put_user(offset, &dirent->d_offset) ||
805 __put_user(namlen, &dirent->d_namlen) ||
806 __copy_to_user(dirent->d_name, name, namlen) ||
807 __put_user(0, dirent->d_name + namlen))
808 goto efault;
809 return 0;
810 efault:
811 buf->result = -EFAULT;
812 return -EFAULT;
813 }
814
815 asmlinkage long compat_sys_old_readdir(unsigned int fd,
816 struct compat_old_linux_dirent __user *dirent, unsigned int count)
817 {
818 int error;
819 struct file *file;
820 struct compat_readdir_callback buf;
821
822 error = -EBADF;
823 file = fget(fd);
824 if (!file)
825 goto out;
826
827 buf.result = 0;
828 buf.dirent = dirent;
829
830 error = vfs_readdir(file, compat_fillonedir, &buf);
831 if (error >= 0)
832 error = buf.result;
833
834 fput(file);
835 out:
836 return error;
837 }
838
839 struct compat_linux_dirent {
840 compat_ulong_t d_ino;
841 compat_ulong_t d_off;
842 unsigned short d_reclen;
843 char d_name[1];
844 };
845
846 struct compat_getdents_callback {
847 struct compat_linux_dirent __user *current_dir;
848 struct compat_linux_dirent __user *previous;
849 int count;
850 int error;
851 };
852
853 static int compat_filldir(void *__buf, const char *name, int namlen,
854 loff_t offset, u64 ino, unsigned int d_type)
855 {
856 struct compat_linux_dirent __user * dirent;
857 struct compat_getdents_callback *buf = __buf;
858 compat_ulong_t d_ino;
859 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
860
861 buf->error = -EINVAL; /* only used if we fail.. */
862 if (reclen > buf->count)
863 return -EINVAL;
864 d_ino = ino;
865 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
866 return -EOVERFLOW;
867 dirent = buf->previous;
868 if (dirent) {
869 if (__put_user(offset, &dirent->d_off))
870 goto efault;
871 }
872 dirent = buf->current_dir;
873 if (__put_user(d_ino, &dirent->d_ino))
874 goto efault;
875 if (__put_user(reclen, &dirent->d_reclen))
876 goto efault;
877 if (copy_to_user(dirent->d_name, name, namlen))
878 goto efault;
879 if (__put_user(0, dirent->d_name + namlen))
880 goto efault;
881 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
882 goto efault;
883 buf->previous = dirent;
884 dirent = (void __user *)dirent + reclen;
885 buf->current_dir = dirent;
886 buf->count -= reclen;
887 return 0;
888 efault:
889 buf->error = -EFAULT;
890 return -EFAULT;
891 }
892
893 asmlinkage long compat_sys_getdents(unsigned int fd,
894 struct compat_linux_dirent __user *dirent, unsigned int count)
895 {
896 struct file * file;
897 struct compat_linux_dirent __user * lastdirent;
898 struct compat_getdents_callback buf;
899 int error;
900
901 error = -EFAULT;
902 if (!access_ok(VERIFY_WRITE, dirent, count))
903 goto out;
904
905 error = -EBADF;
906 file = fget(fd);
907 if (!file)
908 goto out;
909
910 buf.current_dir = dirent;
911 buf.previous = NULL;
912 buf.count = count;
913 buf.error = 0;
914
915 error = vfs_readdir(file, compat_filldir, &buf);
916 if (error < 0)
917 goto out_putf;
918 error = buf.error;
919 lastdirent = buf.previous;
920 if (lastdirent) {
921 if (put_user(file->f_pos, &lastdirent->d_off))
922 error = -EFAULT;
923 else
924 error = count - buf.count;
925 }
926
927 out_putf:
928 fput(file);
929 out:
930 return error;
931 }
932
933 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
934
935 struct compat_getdents_callback64 {
936 struct linux_dirent64 __user *current_dir;
937 struct linux_dirent64 __user *previous;
938 int count;
939 int error;
940 };
941
942 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
943 u64 ino, unsigned int d_type)
944 {
945 struct linux_dirent64 __user *dirent;
946 struct compat_getdents_callback64 *buf = __buf;
947 int jj = NAME_OFFSET(dirent);
948 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
949 u64 off;
950
951 buf->error = -EINVAL; /* only used if we fail.. */
952 if (reclen > buf->count)
953 return -EINVAL;
954 dirent = buf->previous;
955
956 if (dirent) {
957 if (__put_user_unaligned(offset, &dirent->d_off))
958 goto efault;
959 }
960 dirent = buf->current_dir;
961 if (__put_user_unaligned(ino, &dirent->d_ino))
962 goto efault;
963 off = 0;
964 if (__put_user_unaligned(off, &dirent->d_off))
965 goto efault;
966 if (__put_user(reclen, &dirent->d_reclen))
967 goto efault;
968 if (__put_user(d_type, &dirent->d_type))
969 goto efault;
970 if (copy_to_user(dirent->d_name, name, namlen))
971 goto efault;
972 if (__put_user(0, dirent->d_name + namlen))
973 goto efault;
974 buf->previous = dirent;
975 dirent = (void __user *)dirent + reclen;
976 buf->current_dir = dirent;
977 buf->count -= reclen;
978 return 0;
979 efault:
980 buf->error = -EFAULT;
981 return -EFAULT;
982 }
983
984 asmlinkage long compat_sys_getdents64(unsigned int fd,
985 struct linux_dirent64 __user * dirent, unsigned int count)
986 {
987 struct file * file;
988 struct linux_dirent64 __user * lastdirent;
989 struct compat_getdents_callback64 buf;
990 int error;
991
992 error = -EFAULT;
993 if (!access_ok(VERIFY_WRITE, dirent, count))
994 goto out;
995
996 error = -EBADF;
997 file = fget(fd);
998 if (!file)
999 goto out;
1000
1001 buf.current_dir = dirent;
1002 buf.previous = NULL;
1003 buf.count = count;
1004 buf.error = 0;
1005
1006 error = vfs_readdir(file, compat_filldir64, &buf);
1007 if (error < 0)
1008 goto out_putf;
1009 error = buf.error;
1010 lastdirent = buf.previous;
1011 if (lastdirent) {
1012 typeof(lastdirent->d_off) d_off = file->f_pos;
1013 error = -EFAULT;
1014 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1015 goto out_putf;
1016 error = count - buf.count;
1017 }
1018
1019 out_putf:
1020 fput(file);
1021 out:
1022 return error;
1023 }
1024 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1025
1026 static ssize_t compat_do_readv_writev(int type, struct file *file,
1027 const struct compat_iovec __user *uvector,
1028 unsigned long nr_segs, loff_t *pos)
1029 {
1030 compat_ssize_t tot_len;
1031 struct iovec iovstack[UIO_FASTIOV];
1032 struct iovec *iov=iovstack, *vector;
1033 ssize_t ret;
1034 int seg;
1035 io_fn_t fn;
1036 iov_fn_t fnv;
1037
1038 /*
1039 * SuS says "The readv() function *may* fail if the iovcnt argument
1040 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1041 * traditionally returned zero for zero segments, so...
1042 */
1043 ret = 0;
1044 if (nr_segs == 0)
1045 goto out;
1046
1047 /*
1048 * First get the "struct iovec" from user memory and
1049 * verify all the pointers
1050 */
1051 ret = -EINVAL;
1052 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1053 goto out;
1054 if (!file->f_op)
1055 goto out;
1056 if (nr_segs > UIO_FASTIOV) {
1057 ret = -ENOMEM;
1058 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1059 if (!iov)
1060 goto out;
1061 }
1062 ret = -EFAULT;
1063 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1064 goto out;
1065
1066 /*
1067 * Single unix specification:
1068 * We should -EINVAL if an element length is not >= 0 and fitting an
1069 * ssize_t. The total length is fitting an ssize_t
1070 *
1071 * Be careful here because iov_len is a size_t not an ssize_t
1072 */
1073 tot_len = 0;
1074 vector = iov;
1075 ret = -EINVAL;
1076 for (seg = 0 ; seg < nr_segs; seg++) {
1077 compat_ssize_t tmp = tot_len;
1078 compat_ssize_t len;
1079 compat_uptr_t buf;
1080
1081 if (__get_user(len, &uvector->iov_len) ||
1082 __get_user(buf, &uvector->iov_base)) {
1083 ret = -EFAULT;
1084 goto out;
1085 }
1086 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1087 goto out;
1088 tot_len += len;
1089 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1090 goto out;
1091 vector->iov_base = compat_ptr(buf);
1092 vector->iov_len = (compat_size_t) len;
1093 uvector++;
1094 vector++;
1095 }
1096 if (tot_len == 0) {
1097 ret = 0;
1098 goto out;
1099 }
1100
1101 ret = rw_verify_area(type, file, pos, tot_len);
1102 if (ret < 0)
1103 goto out;
1104
1105 fnv = NULL;
1106 if (type == READ) {
1107 fn = file->f_op->read;
1108 fnv = file->f_op->aio_read;
1109 } else {
1110 fn = (io_fn_t)file->f_op->write;
1111 fnv = file->f_op->aio_write;
1112 }
1113
1114 if (fnv)
1115 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1116 pos, fnv);
1117 else
1118 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1119
1120 out:
1121 if (iov != iovstack)
1122 kfree(iov);
1123 if ((ret + (type == READ)) > 0) {
1124 struct dentry *dentry = file->f_path.dentry;
1125 if (type == READ)
1126 fsnotify_access(dentry);
1127 else
1128 fsnotify_modify(dentry);
1129 }
1130 return ret;
1131 }
1132
1133 asmlinkage ssize_t
1134 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1135 {
1136 struct file *file;
1137 ssize_t ret = -EBADF;
1138
1139 file = fget(fd);
1140 if (!file)
1141 return -EBADF;
1142
1143 if (!(file->f_mode & FMODE_READ))
1144 goto out;
1145
1146 ret = -EINVAL;
1147 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1148 goto out;
1149
1150 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1151
1152 out:
1153 fput(file);
1154 return ret;
1155 }
1156
1157 asmlinkage ssize_t
1158 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1159 {
1160 struct file *file;
1161 ssize_t ret = -EBADF;
1162
1163 file = fget(fd);
1164 if (!file)
1165 return -EBADF;
1166 if (!(file->f_mode & FMODE_WRITE))
1167 goto out;
1168
1169 ret = -EINVAL;
1170 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1171 goto out;
1172
1173 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1174
1175 out:
1176 fput(file);
1177 return ret;
1178 }
1179
1180 asmlinkage long
1181 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1182 unsigned int nr_segs, unsigned int flags)
1183 {
1184 unsigned i;
1185 struct iovec __user *iov;
1186 if (nr_segs > UIO_MAXIOV)
1187 return -EINVAL;
1188 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1189 for (i = 0; i < nr_segs; i++) {
1190 struct compat_iovec v;
1191 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1192 get_user(v.iov_len, &iov32[i].iov_len) ||
1193 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1194 put_user(v.iov_len, &iov[i].iov_len))
1195 return -EFAULT;
1196 }
1197 return sys_vmsplice(fd, iov, nr_segs, flags);
1198 }
1199
1200 /*
1201 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1202 * O_LARGEFILE flag.
1203 */
1204 asmlinkage long
1205 compat_sys_open(const char __user *filename, int flags, int mode)
1206 {
1207 return do_sys_open(AT_FDCWD, filename, flags, mode);
1208 }
1209
1210 /*
1211 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1212 * O_LARGEFILE flag.
1213 */
1214 asmlinkage long
1215 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1216 {
1217 return do_sys_open(dfd, filename, flags, mode);
1218 }
1219
1220 /*
1221 * compat_count() counts the number of arguments/envelopes. It is basically
1222 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1223 * and envp pointers.
1224 */
1225 static int compat_count(compat_uptr_t __user *argv, int max)
1226 {
1227 int i = 0;
1228
1229 if (argv != NULL) {
1230 for (;;) {
1231 compat_uptr_t p;
1232
1233 if (get_user(p, argv))
1234 return -EFAULT;
1235 if (!p)
1236 break;
1237 argv++;
1238 if(++i > max)
1239 return -E2BIG;
1240 }
1241 }
1242 return i;
1243 }
1244
1245 /*
1246 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1247 * except that it works with 32 bit argv and envp pointers.
1248 */
1249 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1250 struct linux_binprm *bprm)
1251 {
1252 struct page *kmapped_page = NULL;
1253 char *kaddr = NULL;
1254 unsigned long kpos = 0;
1255 int ret;
1256
1257 while (argc-- > 0) {
1258 compat_uptr_t str;
1259 int len;
1260 unsigned long pos;
1261
1262 if (get_user(str, argv+argc) ||
1263 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1264 ret = -EFAULT;
1265 goto out;
1266 }
1267
1268 if (len > MAX_ARG_STRLEN) {
1269 ret = -E2BIG;
1270 goto out;
1271 }
1272
1273 /* We're going to work our way backwords. */
1274 pos = bprm->p;
1275 str += len;
1276 bprm->p -= len;
1277
1278 while (len > 0) {
1279 int offset, bytes_to_copy;
1280
1281 offset = pos % PAGE_SIZE;
1282 if (offset == 0)
1283 offset = PAGE_SIZE;
1284
1285 bytes_to_copy = offset;
1286 if (bytes_to_copy > len)
1287 bytes_to_copy = len;
1288
1289 offset -= bytes_to_copy;
1290 pos -= bytes_to_copy;
1291 str -= bytes_to_copy;
1292 len -= bytes_to_copy;
1293
1294 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1295 struct page *page;
1296
1297 #ifdef CONFIG_STACK_GROWSUP
1298 ret = expand_stack_downwards(bprm->vma, pos);
1299 if (ret < 0) {
1300 /* We've exceed the stack rlimit. */
1301 ret = -E2BIG;
1302 goto out;
1303 }
1304 #endif
1305 ret = get_user_pages(current, bprm->mm, pos,
1306 1, 1, 1, &page, NULL);
1307 if (ret <= 0) {
1308 /* We've exceed the stack rlimit. */
1309 ret = -E2BIG;
1310 goto out;
1311 }
1312
1313 if (kmapped_page) {
1314 flush_kernel_dcache_page(kmapped_page);
1315 kunmap(kmapped_page);
1316 put_page(kmapped_page);
1317 }
1318 kmapped_page = page;
1319 kaddr = kmap(kmapped_page);
1320 kpos = pos & PAGE_MASK;
1321 flush_cache_page(bprm->vma, kpos,
1322 page_to_pfn(kmapped_page));
1323 }
1324 if (copy_from_user(kaddr+offset, compat_ptr(str),
1325 bytes_to_copy)) {
1326 ret = -EFAULT;
1327 goto out;
1328 }
1329 }
1330 }
1331 ret = 0;
1332 out:
1333 if (kmapped_page) {
1334 flush_kernel_dcache_page(kmapped_page);
1335 kunmap(kmapped_page);
1336 put_page(kmapped_page);
1337 }
1338 return ret;
1339 }
1340
1341 /*
1342 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1343 * that it processes 32 bit argv and envp pointers.
1344 */
1345 int compat_do_execve(char * filename,
1346 compat_uptr_t __user *argv,
1347 compat_uptr_t __user *envp,
1348 struct pt_regs * regs)
1349 {
1350 struct linux_binprm *bprm;
1351 struct file *file;
1352 int retval;
1353
1354 retval = -ENOMEM;
1355 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1356 if (!bprm)
1357 goto out_ret;
1358
1359 file = open_exec(filename);
1360 retval = PTR_ERR(file);
1361 if (IS_ERR(file))
1362 goto out_kfree;
1363
1364 sched_exec();
1365
1366 bprm->file = file;
1367 bprm->filename = filename;
1368 bprm->interp = filename;
1369
1370 retval = bprm_mm_init(bprm);
1371 if (retval)
1372 goto out_file;
1373
1374 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1375 if ((retval = bprm->argc) < 0)
1376 goto out_mm;
1377
1378 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1379 if ((retval = bprm->envc) < 0)
1380 goto out_mm;
1381
1382 retval = security_bprm_alloc(bprm);
1383 if (retval)
1384 goto out;
1385
1386 retval = prepare_binprm(bprm);
1387 if (retval < 0)
1388 goto out;
1389
1390 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1391 if (retval < 0)
1392 goto out;
1393
1394 bprm->exec = bprm->p;
1395 retval = compat_copy_strings(bprm->envc, envp, bprm);
1396 if (retval < 0)
1397 goto out;
1398
1399 retval = compat_copy_strings(bprm->argc, argv, bprm);
1400 if (retval < 0)
1401 goto out;
1402
1403 retval = search_binary_handler(bprm, regs);
1404 if (retval >= 0) {
1405 /* execve success */
1406 security_bprm_free(bprm);
1407 acct_update_integrals(current);
1408 free_bprm(bprm);
1409 return retval;
1410 }
1411
1412 out:
1413 if (bprm->security)
1414 security_bprm_free(bprm);
1415
1416 out_mm:
1417 if (bprm->mm)
1418 mmput(bprm->mm);
1419
1420 out_file:
1421 if (bprm->file) {
1422 allow_write_access(bprm->file);
1423 fput(bprm->file);
1424 }
1425
1426 out_kfree:
1427 free_bprm(bprm);
1428
1429 out_ret:
1430 return retval;
1431 }
1432
1433 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1434
1435 /*
1436 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1437 * 64-bit unsigned longs.
1438 */
1439 static
1440 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1441 unsigned long *fdset)
1442 {
1443 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1444 if (ufdset) {
1445 unsigned long odd;
1446
1447 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1448 return -EFAULT;
1449
1450 odd = nr & 1UL;
1451 nr &= ~1UL;
1452 while (nr) {
1453 unsigned long h, l;
1454 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1455 return -EFAULT;
1456 ufdset += 2;
1457 *fdset++ = h << 32 | l;
1458 nr -= 2;
1459 }
1460 if (odd && __get_user(*fdset, ufdset))
1461 return -EFAULT;
1462 } else {
1463 /* Tricky, must clear full unsigned long in the
1464 * kernel fdset at the end, this makes sure that
1465 * actually happens.
1466 */
1467 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1468 }
1469 return 0;
1470 }
1471
1472 static
1473 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1474 unsigned long *fdset)
1475 {
1476 unsigned long odd;
1477 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1478
1479 if (!ufdset)
1480 return 0;
1481
1482 odd = nr & 1UL;
1483 nr &= ~1UL;
1484 while (nr) {
1485 unsigned long h, l;
1486 l = *fdset++;
1487 h = l >> 32;
1488 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1489 return -EFAULT;
1490 ufdset += 2;
1491 nr -= 2;
1492 }
1493 if (odd && __put_user(*fdset, ufdset))
1494 return -EFAULT;
1495 return 0;
1496 }
1497
1498
1499 /*
1500 * This is a virtual copy of sys_select from fs/select.c and probably
1501 * should be compared to it from time to time
1502 */
1503
1504 /*
1505 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1506 * like to be certain this leads to no problems. So I return
1507 * EINTR just for safety.
1508 *
1509 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1510 * I'm trying ERESTARTNOHAND which restart only when you want to.
1511 */
1512 #define MAX_SELECT_SECONDS \
1513 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1514
1515 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1516 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1517 {
1518 fd_set_bits fds;
1519 void *bits;
1520 int size, max_fds, ret = -EINVAL;
1521 struct fdtable *fdt;
1522 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1523
1524 if (n < 0)
1525 goto out_nofds;
1526
1527 /* max_fds can increase, so grab it once to avoid race */
1528 rcu_read_lock();
1529 fdt = files_fdtable(current->files);
1530 max_fds = fdt->max_fds;
1531 rcu_read_unlock();
1532 if (n > max_fds)
1533 n = max_fds;
1534
1535 /*
1536 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1537 * since we used fdset we need to allocate memory in units of
1538 * long-words.
1539 */
1540 size = FDS_BYTES(n);
1541 bits = stack_fds;
1542 if (size > sizeof(stack_fds) / 6) {
1543 bits = kmalloc(6 * size, GFP_KERNEL);
1544 ret = -ENOMEM;
1545 if (!bits)
1546 goto out_nofds;
1547 }
1548 fds.in = (unsigned long *) bits;
1549 fds.out = (unsigned long *) (bits + size);
1550 fds.ex = (unsigned long *) (bits + 2*size);
1551 fds.res_in = (unsigned long *) (bits + 3*size);
1552 fds.res_out = (unsigned long *) (bits + 4*size);
1553 fds.res_ex = (unsigned long *) (bits + 5*size);
1554
1555 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1556 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1557 (ret = compat_get_fd_set(n, exp, fds.ex)))
1558 goto out;
1559 zero_fd_set(n, fds.res_in);
1560 zero_fd_set(n, fds.res_out);
1561 zero_fd_set(n, fds.res_ex);
1562
1563 ret = do_select(n, &fds, timeout);
1564
1565 if (ret < 0)
1566 goto out;
1567 if (!ret) {
1568 ret = -ERESTARTNOHAND;
1569 if (signal_pending(current))
1570 goto out;
1571 ret = 0;
1572 }
1573
1574 if (compat_set_fd_set(n, inp, fds.res_in) ||
1575 compat_set_fd_set(n, outp, fds.res_out) ||
1576 compat_set_fd_set(n, exp, fds.res_ex))
1577 ret = -EFAULT;
1578 out:
1579 if (bits != stack_fds)
1580 kfree(bits);
1581 out_nofds:
1582 return ret;
1583 }
1584
1585 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1586 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1587 struct compat_timeval __user *tvp)
1588 {
1589 s64 timeout = -1;
1590 struct compat_timeval tv;
1591 int ret;
1592
1593 if (tvp) {
1594 if (copy_from_user(&tv, tvp, sizeof(tv)))
1595 return -EFAULT;
1596
1597 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1598 return -EINVAL;
1599
1600 /* Cast to u64 to make GCC stop complaining */
1601 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1602 timeout = -1; /* infinite */
1603 else {
1604 timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
1605 timeout += tv.tv_sec * HZ;
1606 }
1607 }
1608
1609 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1610
1611 if (tvp) {
1612 struct compat_timeval rtv;
1613
1614 if (current->personality & STICKY_TIMEOUTS)
1615 goto sticky;
1616 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1617 rtv.tv_sec = timeout;
1618 if (compat_timeval_compare(&rtv, &tv) >= 0)
1619 rtv = tv;
1620 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1621 sticky:
1622 /*
1623 * If an application puts its timeval in read-only
1624 * memory, we don't want the Linux-specific update to
1625 * the timeval to cause a fault after the select has
1626 * completed successfully. However, because we're not
1627 * updating the timeval, we can't restart the system
1628 * call.
1629 */
1630 if (ret == -ERESTARTNOHAND)
1631 ret = -EINTR;
1632 }
1633 }
1634
1635 return ret;
1636 }
1637
1638 #ifdef HAVE_SET_RESTORE_SIGMASK
1639 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1640 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1641 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1642 compat_size_t sigsetsize)
1643 {
1644 compat_sigset_t ss32;
1645 sigset_t ksigmask, sigsaved;
1646 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1647 struct compat_timespec ts;
1648 int ret;
1649
1650 if (tsp) {
1651 if (copy_from_user(&ts, tsp, sizeof(ts)))
1652 return -EFAULT;
1653
1654 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1655 return -EINVAL;
1656 }
1657
1658 if (sigmask) {
1659 if (sigsetsize != sizeof(compat_sigset_t))
1660 return -EINVAL;
1661 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1662 return -EFAULT;
1663 sigset_from_compat(&ksigmask, &ss32);
1664
1665 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1666 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1667 }
1668
1669 do {
1670 if (tsp) {
1671 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1672 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1673 timeout += ts.tv_sec * (unsigned long)HZ;
1674 ts.tv_sec = 0;
1675 ts.tv_nsec = 0;
1676 } else {
1677 ts.tv_sec -= MAX_SELECT_SECONDS;
1678 timeout = MAX_SELECT_SECONDS * HZ;
1679 }
1680 }
1681
1682 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1683
1684 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1685
1686 if (tsp) {
1687 struct compat_timespec rts;
1688
1689 if (current->personality & STICKY_TIMEOUTS)
1690 goto sticky;
1691
1692 rts.tv_sec = timeout / HZ;
1693 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1694 if (rts.tv_nsec >= NSEC_PER_SEC) {
1695 rts.tv_sec++;
1696 rts.tv_nsec -= NSEC_PER_SEC;
1697 }
1698 if (compat_timespec_compare(&rts, &ts) >= 0)
1699 rts = ts;
1700 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1701 sticky:
1702 /*
1703 * If an application puts its timeval in read-only
1704 * memory, we don't want the Linux-specific update to
1705 * the timeval to cause a fault after the select has
1706 * completed successfully. However, because we're not
1707 * updating the timeval, we can't restart the system
1708 * call.
1709 */
1710 if (ret == -ERESTARTNOHAND)
1711 ret = -EINTR;
1712 }
1713 }
1714
1715 if (ret == -ERESTARTNOHAND) {
1716 /*
1717 * Don't restore the signal mask yet. Let do_signal() deliver
1718 * the signal on the way back to userspace, before the signal
1719 * mask is restored.
1720 */
1721 if (sigmask) {
1722 memcpy(&current->saved_sigmask, &sigsaved,
1723 sizeof(sigsaved));
1724 set_restore_sigmask();
1725 }
1726 } else if (sigmask)
1727 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1728
1729 return ret;
1730 }
1731
1732 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1733 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1734 struct compat_timespec __user *tsp, void __user *sig)
1735 {
1736 compat_size_t sigsetsize = 0;
1737 compat_uptr_t up = 0;
1738
1739 if (sig) {
1740 if (!access_ok(VERIFY_READ, sig,
1741 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1742 __get_user(up, (compat_uptr_t __user *)sig) ||
1743 __get_user(sigsetsize,
1744 (compat_size_t __user *)(sig+sizeof(up))))
1745 return -EFAULT;
1746 }
1747 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1748 sigsetsize);
1749 }
1750
1751 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1752 unsigned int nfds, struct compat_timespec __user *tsp,
1753 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1754 {
1755 compat_sigset_t ss32;
1756 sigset_t ksigmask, sigsaved;
1757 struct compat_timespec ts;
1758 s64 timeout = -1;
1759 int ret;
1760
1761 if (tsp) {
1762 if (copy_from_user(&ts, tsp, sizeof(ts)))
1763 return -EFAULT;
1764
1765 /* We assume that ts.tv_sec is always lower than
1766 the number of seconds that can be expressed in
1767 an s64. Otherwise the compiler bitches at us */
1768 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1769 timeout += ts.tv_sec * HZ;
1770 }
1771
1772 if (sigmask) {
1773 if (sigsetsize != sizeof(compat_sigset_t))
1774 return -EINVAL;
1775 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1776 return -EFAULT;
1777 sigset_from_compat(&ksigmask, &ss32);
1778
1779 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1780 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1781 }
1782
1783 ret = do_sys_poll(ufds, nfds, &timeout);
1784
1785 /* We can restart this syscall, usually */
1786 if (ret == -EINTR) {
1787 /*
1788 * Don't restore the signal mask yet. Let do_signal() deliver
1789 * the signal on the way back to userspace, before the signal
1790 * mask is restored.
1791 */
1792 if (sigmask) {
1793 memcpy(&current->saved_sigmask, &sigsaved,
1794 sizeof(sigsaved));
1795 set_restore_sigmask();
1796 }
1797 ret = -ERESTARTNOHAND;
1798 } else if (sigmask)
1799 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1800
1801 if (tsp && timeout >= 0) {
1802 struct compat_timespec rts;
1803
1804 if (current->personality & STICKY_TIMEOUTS)
1805 goto sticky;
1806 /* Yes, we know it's actually an s64, but it's also positive. */
1807 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1808 1000;
1809 rts.tv_sec = timeout;
1810 if (compat_timespec_compare(&rts, &ts) >= 0)
1811 rts = ts;
1812 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1813 sticky:
1814 /*
1815 * If an application puts its timeval in read-only
1816 * memory, we don't want the Linux-specific update to
1817 * the timeval to cause a fault after the select has
1818 * completed successfully. However, because we're not
1819 * updating the timeval, we can't restart the system
1820 * call.
1821 */
1822 if (ret == -ERESTARTNOHAND && timeout >= 0)
1823 ret = -EINTR;
1824 }
1825 }
1826
1827 return ret;
1828 }
1829 #endif /* HAVE_SET_RESTORE_SIGMASK */
1830
1831 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1832 /* Stuff for NFS server syscalls... */
1833 struct compat_nfsctl_svc {
1834 u16 svc32_port;
1835 s32 svc32_nthreads;
1836 };
1837
1838 struct compat_nfsctl_client {
1839 s8 cl32_ident[NFSCLNT_IDMAX+1];
1840 s32 cl32_naddr;
1841 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1842 s32 cl32_fhkeytype;
1843 s32 cl32_fhkeylen;
1844 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1845 };
1846
1847 struct compat_nfsctl_export {
1848 char ex32_client[NFSCLNT_IDMAX+1];
1849 char ex32_path[NFS_MAXPATHLEN+1];
1850 compat_dev_t ex32_dev;
1851 compat_ino_t ex32_ino;
1852 compat_int_t ex32_flags;
1853 __compat_uid_t ex32_anon_uid;
1854 __compat_gid_t ex32_anon_gid;
1855 };
1856
1857 struct compat_nfsctl_fdparm {
1858 struct sockaddr gd32_addr;
1859 s8 gd32_path[NFS_MAXPATHLEN+1];
1860 compat_int_t gd32_version;
1861 };
1862
1863 struct compat_nfsctl_fsparm {
1864 struct sockaddr gd32_addr;
1865 s8 gd32_path[NFS_MAXPATHLEN+1];
1866 compat_int_t gd32_maxlen;
1867 };
1868
1869 struct compat_nfsctl_arg {
1870 compat_int_t ca32_version; /* safeguard */
1871 union {
1872 struct compat_nfsctl_svc u32_svc;
1873 struct compat_nfsctl_client u32_client;
1874 struct compat_nfsctl_export u32_export;
1875 struct compat_nfsctl_fdparm u32_getfd;
1876 struct compat_nfsctl_fsparm u32_getfs;
1877 } u;
1878 #define ca32_svc u.u32_svc
1879 #define ca32_client u.u32_client
1880 #define ca32_export u.u32_export
1881 #define ca32_getfd u.u32_getfd
1882 #define ca32_getfs u.u32_getfs
1883 };
1884
1885 union compat_nfsctl_res {
1886 __u8 cr32_getfh[NFS_FHSIZE];
1887 struct knfsd_fh cr32_getfs;
1888 };
1889
1890 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1891 struct compat_nfsctl_arg __user *arg)
1892 {
1893 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1894 get_user(karg->ca_version, &arg->ca32_version) ||
1895 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1896 __get_user(karg->ca_svc.svc_nthreads,
1897 &arg->ca32_svc.svc32_nthreads))
1898 return -EFAULT;
1899 return 0;
1900 }
1901
1902 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1903 struct compat_nfsctl_arg __user *arg)
1904 {
1905 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1906 sizeof(arg->ca32_client)) ||
1907 get_user(karg->ca_version, &arg->ca32_version) ||
1908 __copy_from_user(&karg->ca_client.cl_ident[0],
1909 &arg->ca32_client.cl32_ident[0],
1910 NFSCLNT_IDMAX) ||
1911 __get_user(karg->ca_client.cl_naddr,
1912 &arg->ca32_client.cl32_naddr) ||
1913 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1914 &arg->ca32_client.cl32_addrlist[0],
1915 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1916 __get_user(karg->ca_client.cl_fhkeytype,
1917 &arg->ca32_client.cl32_fhkeytype) ||
1918 __get_user(karg->ca_client.cl_fhkeylen,
1919 &arg->ca32_client.cl32_fhkeylen) ||
1920 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1921 &arg->ca32_client.cl32_fhkey[0],
1922 NFSCLNT_KEYMAX))
1923 return -EFAULT;
1924
1925 return 0;
1926 }
1927
1928 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1929 struct compat_nfsctl_arg __user *arg)
1930 {
1931 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1932 sizeof(arg->ca32_export)) ||
1933 get_user(karg->ca_version, &arg->ca32_version) ||
1934 __copy_from_user(&karg->ca_export.ex_client[0],
1935 &arg->ca32_export.ex32_client[0],
1936 NFSCLNT_IDMAX) ||
1937 __copy_from_user(&karg->ca_export.ex_path[0],
1938 &arg->ca32_export.ex32_path[0],
1939 NFS_MAXPATHLEN) ||
1940 __get_user(karg->ca_export.ex_dev,
1941 &arg->ca32_export.ex32_dev) ||
1942 __get_user(karg->ca_export.ex_ino,
1943 &arg->ca32_export.ex32_ino) ||
1944 __get_user(karg->ca_export.ex_flags,
1945 &arg->ca32_export.ex32_flags) ||
1946 __get_user(karg->ca_export.ex_anon_uid,
1947 &arg->ca32_export.ex32_anon_uid) ||
1948 __get_user(karg->ca_export.ex_anon_gid,
1949 &arg->ca32_export.ex32_anon_gid))
1950 return -EFAULT;
1951 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1952 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1953
1954 return 0;
1955 }
1956
1957 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1958 struct compat_nfsctl_arg __user *arg)
1959 {
1960 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1961 sizeof(arg->ca32_getfd)) ||
1962 get_user(karg->ca_version, &arg->ca32_version) ||
1963 __copy_from_user(&karg->ca_getfd.gd_addr,
1964 &arg->ca32_getfd.gd32_addr,
1965 (sizeof(struct sockaddr))) ||
1966 __copy_from_user(&karg->ca_getfd.gd_path,
1967 &arg->ca32_getfd.gd32_path,
1968 (NFS_MAXPATHLEN+1)) ||
1969 __get_user(karg->ca_getfd.gd_version,
1970 &arg->ca32_getfd.gd32_version))
1971 return -EFAULT;
1972
1973 return 0;
1974 }
1975
1976 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1977 struct compat_nfsctl_arg __user *arg)
1978 {
1979 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1980 get_user(karg->ca_version, &arg->ca32_version) ||
1981 __copy_from_user(&karg->ca_getfs.gd_addr,
1982 &arg->ca32_getfs.gd32_addr,
1983 (sizeof(struct sockaddr))) ||
1984 __copy_from_user(&karg->ca_getfs.gd_path,
1985 &arg->ca32_getfs.gd32_path,
1986 (NFS_MAXPATHLEN+1)) ||
1987 __get_user(karg->ca_getfs.gd_maxlen,
1988 &arg->ca32_getfs.gd32_maxlen))
1989 return -EFAULT;
1990
1991 return 0;
1992 }
1993
1994 /* This really doesn't need translations, we are only passing
1995 * back a union which contains opaque nfs file handle data.
1996 */
1997 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
1998 union compat_nfsctl_res __user *res)
1999 {
2000 int err;
2001
2002 err = copy_to_user(res, kres, sizeof(*res));
2003
2004 return (err) ? -EFAULT : 0;
2005 }
2006
2007 asmlinkage long compat_sys_nfsservctl(int cmd,
2008 struct compat_nfsctl_arg __user *arg,
2009 union compat_nfsctl_res __user *res)
2010 {
2011 struct nfsctl_arg *karg;
2012 union nfsctl_res *kres;
2013 mm_segment_t oldfs;
2014 int err;
2015
2016 karg = kmalloc(sizeof(*karg), GFP_USER);
2017 kres = kmalloc(sizeof(*kres), GFP_USER);
2018 if(!karg || !kres) {
2019 err = -ENOMEM;
2020 goto done;
2021 }
2022
2023 switch(cmd) {
2024 case NFSCTL_SVC:
2025 err = compat_nfs_svc_trans(karg, arg);
2026 break;
2027
2028 case NFSCTL_ADDCLIENT:
2029 err = compat_nfs_clnt_trans(karg, arg);
2030 break;
2031
2032 case NFSCTL_DELCLIENT:
2033 err = compat_nfs_clnt_trans(karg, arg);
2034 break;
2035
2036 case NFSCTL_EXPORT:
2037 case NFSCTL_UNEXPORT:
2038 err = compat_nfs_exp_trans(karg, arg);
2039 break;
2040
2041 case NFSCTL_GETFD:
2042 err = compat_nfs_getfd_trans(karg, arg);
2043 break;
2044
2045 case NFSCTL_GETFS:
2046 err = compat_nfs_getfs_trans(karg, arg);
2047 break;
2048
2049 default:
2050 err = -EINVAL;
2051 break;
2052 }
2053
2054 if (err)
2055 goto done;
2056
2057 oldfs = get_fs();
2058 set_fs(KERNEL_DS);
2059 /* The __user pointer casts are valid because of the set_fs() */
2060 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2061 set_fs(oldfs);
2062
2063 if (err)
2064 goto done;
2065
2066 if((cmd == NFSCTL_GETFD) ||
2067 (cmd == NFSCTL_GETFS))
2068 err = compat_nfs_getfh_res_trans(kres, res);
2069
2070 done:
2071 kfree(karg);
2072 kfree(kres);
2073 return err;
2074 }
2075 #else /* !NFSD */
2076 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2077 {
2078 return sys_ni_syscall();
2079 }
2080 #endif
2081
2082 #ifdef CONFIG_EPOLL
2083
2084 #ifdef HAVE_SET_RESTORE_SIGMASK
2085 asmlinkage long compat_sys_epoll_pwait(int epfd,
2086 struct compat_epoll_event __user *events,
2087 int maxevents, int timeout,
2088 const compat_sigset_t __user *sigmask,
2089 compat_size_t sigsetsize)
2090 {
2091 long err;
2092 compat_sigset_t csigmask;
2093 sigset_t ksigmask, sigsaved;
2094
2095 /*
2096 * If the caller wants a certain signal mask to be set during the wait,
2097 * we apply it here.
2098 */
2099 if (sigmask) {
2100 if (sigsetsize != sizeof(compat_sigset_t))
2101 return -EINVAL;
2102 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2103 return -EFAULT;
2104 sigset_from_compat(&ksigmask, &csigmask);
2105 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2106 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2107 }
2108
2109 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2110
2111 /*
2112 * If we changed the signal mask, we need to restore the original one.
2113 * In case we've got a signal while waiting, we do not restore the
2114 * signal mask yet, and we allow do_signal() to deliver the signal on
2115 * the way back to userspace, before the signal mask is restored.
2116 */
2117 if (sigmask) {
2118 if (err == -EINTR) {
2119 memcpy(&current->saved_sigmask, &sigsaved,
2120 sizeof(sigsaved));
2121 set_restore_sigmask();
2122 } else
2123 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2124 }
2125
2126 return err;
2127 }
2128 #endif /* HAVE_SET_RESTORE_SIGMASK */
2129
2130 #endif /* CONFIG_EPOLL */
2131
2132 #ifdef CONFIG_SIGNALFD
2133
2134 asmlinkage long compat_sys_signalfd4(int ufd,
2135 const compat_sigset_t __user *sigmask,
2136 compat_size_t sigsetsize, int flags)
2137 {
2138 compat_sigset_t ss32;
2139 sigset_t tmp;
2140 sigset_t __user *ksigmask;
2141
2142 if (sigsetsize != sizeof(compat_sigset_t))
2143 return -EINVAL;
2144 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2145 return -EFAULT;
2146 sigset_from_compat(&tmp, &ss32);
2147 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2148 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2149 return -EFAULT;
2150
2151 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2152 }
2153
2154 asmlinkage long compat_sys_signalfd(int ufd,
2155 const compat_sigset_t __user *sigmask,
2156 compat_size_t sigsetsize)
2157 {
2158 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2159 }
2160 #endif /* CONFIG_SIGNALFD */
2161
2162 #ifdef CONFIG_TIMERFD
2163
2164 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2165 const struct compat_itimerspec __user *utmr,
2166 struct compat_itimerspec __user *otmr)
2167 {
2168 int error;
2169 struct itimerspec t;
2170 struct itimerspec __user *ut;
2171
2172 if (get_compat_itimerspec(&t, utmr))
2173 return -EFAULT;
2174 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2175 if (copy_to_user(&ut[0], &t, sizeof(t)))
2176 return -EFAULT;
2177 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2178 if (!error && otmr)
2179 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2180 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2181
2182 return error;
2183 }
2184
2185 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2186 struct compat_itimerspec __user *otmr)
2187 {
2188 int error;
2189 struct itimerspec t;
2190 struct itimerspec __user *ut;
2191
2192 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2193 error = sys_timerfd_gettime(ufd, ut);
2194 if (!error)
2195 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2196 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2197
2198 return error;
2199 }
2200
2201 #endif /* CONFIG_TIMERFD */
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