]> bbs.cooldavid.org Git - net-next-2.6.git/blame - fs/compat.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
rcutorture: Remove redundant assignment to cur_ops in for loop
[net-next-2.6.git] / fs / compat.c
CommitLineData
1da177e4
LT		 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
022a1692 18#include <linux/kernel.h>
1da177e4
LT		 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/vfs.h>
1da177e4
LT		 28#include <linux/ioctl.h>
29#include <linux/init.h>
1da177e4
LT		 30#include <linux/smb.h>
31#include <linux/smb_mount.h>
32#include <linux/ncp_mount.h>
9a9947bf 33#include <linux/nfs4_mount.h>
1da177e4
LT		 34#include <linux/smp_lock.h>
35#include <linux/syscalls.h>
36#include <linux/ctype.h>
37#include <linux/module.h>
38#include <linux/dirent.h>
0eeca283 39#include <linux/fsnotify.h>
1da177e4
LT		 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>
8f0ab514 46#include <linux/tsacct_kern.h>
6272e266 47#include <linux/security.h>
a1f8e7f7 48#include <linux/highmem.h>
bd01f843 49#include <linux/poll.h>
4a805e86 50#include <linux/mm.h>
f6dfb4fd 51#include <linux/eventpoll.h>
1da177e4 52
1da177e4
LT		 53#include <asm/uaccess.h>
54#include <asm/mmu_context.h>
55#include <asm/ioctls.h>
07f3f05c 56#include "internal.h"
9f72949f 57
bebfa101
AK		 58int compat_log = 1;
59
60int compat_printk(const char *fmt, ...)
61{
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70}
71
ee0b3e67
BP		 72#include "read_write.h"
73
1da177e4
LT		 74/*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
79{
80 struct timeval tv[2];
81
82 if (t) {
83 if (get_user(tv[0].tv_sec, &t->actime) ||
84 get_user(tv[1].tv_sec, &t->modtime))
85 return -EFAULT;
86 tv[0].tv_usec = 0;
87 tv[1].tv_usec = 0;
88 }
5590ff0d 89 return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
1da177e4
LT		 90}
91
9ad11ab4 92asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4
LT		 93{
94 struct timeval tv[2];
95
9ad11ab4 96 if (t) {
1da177e4
LT		 97 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
98 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
99 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
100 get_user(tv[1].tv_usec, &t[1].tv_usec))
9ad11ab4
SR		 101 return -EFAULT;
102 }
5590ff0d
UD		 103 return do_utimes(dfd, filename, t ? tv : NULL);
104}
105
106asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
107{
108 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 109}
110
111asmlinkage long compat_sys_newstat(char __user * filename,
112 struct compat_stat __user *statbuf)
113{
114 struct kstat stat;
5590ff0d 115 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 116
117 if (!error)
118 error = cp_compat_stat(&stat, statbuf);
119 return error;
120}
121
122asmlinkage long compat_sys_newlstat(char __user * filename,
123 struct compat_stat __user *statbuf)
124{
125 struct kstat stat;
5590ff0d 126 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 127
128 if (!error)
129 error = cp_compat_stat(&stat, statbuf);
130 return error;
131}
132
82d821dd 133#ifndef __ARCH_WANT_STAT64
9ad11ab4 134asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
5590ff0d
UD		 135 struct compat_stat __user *statbuf, int flag)
136{
137 struct kstat stat;
138 int error = -EINVAL;
139
140 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
141 goto out;
142
143 if (flag & AT_SYMLINK_NOFOLLOW)
144 error = vfs_lstat_fd(dfd, filename, &stat);
145 else
146 error = vfs_stat_fd(dfd, filename, &stat);
147
148 if (!error)
149 error = cp_compat_stat(&stat, statbuf);
150
151out:
152 return error;
153}
82d821dd 154#endif
5590ff0d 155
1da177e4
LT		 156asmlinkage long compat_sys_newfstat(unsigned int fd,
157 struct compat_stat __user * statbuf)
158{
159 struct kstat stat;
160 int error = vfs_fstat(fd, &stat);
161
162 if (!error)
163 error = cp_compat_stat(&stat, statbuf);
164 return error;
165}
166
167static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
168{
169
170 if (sizeof ubuf->f_blocks == 4) {
171 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
172 0xffffffff00000000ULL)
173 return -EOVERFLOW;
174 /* f_files and f_ffree may be -1; it's okay
175 * to stuff that into 32 bits */
176 if (kbuf->f_files != 0xffffffffffffffffULL
177 && (kbuf->f_files & 0xffffffff00000000ULL))
178 return -EOVERFLOW;
179 if (kbuf->f_ffree != 0xffffffffffffffffULL
180 && (kbuf->f_ffree & 0xffffffff00000000ULL))
181 return -EOVERFLOW;
182 }
183 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
184 __put_user(kbuf->f_type, &ubuf->f_type) ||
185 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
186 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
187 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
188 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
189 __put_user(kbuf->f_files, &ubuf->f_files) ||
190 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
191 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
192 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
193 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
194 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
195 __put_user(0, &ubuf->f_spare[0]) ||
196 __put_user(0, &ubuf->f_spare[1]) ||
197 __put_user(0, &ubuf->f_spare[2]) ||
198 __put_user(0, &ubuf->f_spare[3]) ||
199 __put_user(0, &ubuf->f_spare[4]))
200 return -EFAULT;
201 return 0;
202}
203
204/*
205 * The following statfs calls are copies of code from fs/open.c and
206 * should be checked against those from time to time
207 */
208asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
209{
210 struct nameidata nd;
211 int error;
212
213 error = user_path_walk(path, &nd);
214 if (!error) {
215 struct kstatfs tmp;
726c3342 216 error = vfs_statfs(nd.dentry, &tmp);
86e07ce7
DG		 217 if (!error)
218 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 219 path_release(&nd);
220 }
221 return error;
222}
223
224asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
225{
226 struct file * file;
227 struct kstatfs tmp;
228 int error;
229
230 error = -EBADF;
231 file = fget(fd);
232 if (!file)
233 goto out;
0f7fc9e4 234 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 235 if (!error)
236 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 237 fput(file);
238out:
239 return error;
240}
241
242static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
243{
244 if (sizeof ubuf->f_blocks == 4) {
245 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
246 0xffffffff00000000ULL)
247 return -EOVERFLOW;
248 /* f_files and f_ffree may be -1; it's okay
249 * to stuff that into 32 bits */
250 if (kbuf->f_files != 0xffffffffffffffffULL
251 && (kbuf->f_files & 0xffffffff00000000ULL))
252 return -EOVERFLOW;
253 if (kbuf->f_ffree != 0xffffffffffffffffULL
254 && (kbuf->f_ffree & 0xffffffff00000000ULL))
255 return -EOVERFLOW;
256 }
257 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
258 __put_user(kbuf->f_type, &ubuf->f_type) ||
259 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
260 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
261 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
262 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
263 __put_user(kbuf->f_files, &ubuf->f_files) ||
264 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
265 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
266 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
267 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
268 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
269 return -EFAULT;
270 return 0;
271}
272
273asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
274{
275 struct nameidata nd;
276 int error;
277
278 if (sz != sizeof(*buf))
279 return -EINVAL;
280
281 error = user_path_walk(path, &nd);
282 if (!error) {
283 struct kstatfs tmp;
726c3342 284 error = vfs_statfs(nd.dentry, &tmp);
86e07ce7
DG		 285 if (!error)
286 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 287 path_release(&nd);
288 }
289 return error;
290}
291
292asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
293{
294 struct file * file;
295 struct kstatfs tmp;
296 int error;
297
298 if (sz != sizeof(*buf))
299 return -EINVAL;
300
301 error = -EBADF;
302 file = fget(fd);
303 if (!file)
304 goto out;
0f7fc9e4 305 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 306 if (!error)
307 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 308 fput(file);
309out:
310 return error;
311}
312
1da177e4
LT		 313static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
314{
315 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
316 __get_user(kfl->l_type, &ufl->l_type) ||
317 __get_user(kfl->l_whence, &ufl->l_whence) ||
318 __get_user(kfl->l_start, &ufl->l_start) ||
319 __get_user(kfl->l_len, &ufl->l_len) ||
320 __get_user(kfl->l_pid, &ufl->l_pid))
321 return -EFAULT;
322 return 0;
323}
324
325static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
326{
327 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
328 __put_user(kfl->l_type, &ufl->l_type) ||
329 __put_user(kfl->l_whence, &ufl->l_whence) ||
330 __put_user(kfl->l_start, &ufl->l_start) ||
331 __put_user(kfl->l_len, &ufl->l_len) ||
332 __put_user(kfl->l_pid, &ufl->l_pid))
333 return -EFAULT;
334 return 0;
335}
336
337#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
338static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
339{
340 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
341 __get_user(kfl->l_type, &ufl->l_type) ||
342 __get_user(kfl->l_whence, &ufl->l_whence) ||
343 __get_user(kfl->l_start, &ufl->l_start) ||
344 __get_user(kfl->l_len, &ufl->l_len) ||
345 __get_user(kfl->l_pid, &ufl->l_pid))
346 return -EFAULT;
347 return 0;
348}
349#endif
350
351#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
352static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
353{
354 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
355 __put_user(kfl->l_type, &ufl->l_type) ||
356 __put_user(kfl->l_whence, &ufl->l_whence) ||
357 __put_user(kfl->l_start, &ufl->l_start) ||
358 __put_user(kfl->l_len, &ufl->l_len) ||
359 __put_user(kfl->l_pid, &ufl->l_pid))
360 return -EFAULT;
361 return 0;
362}
363#endif
364
365asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
366 unsigned long arg)
367{
368 mm_segment_t old_fs;
369 struct flock f;
370 long ret;
371
372 switch (cmd) {
373 case F_GETLK:
374 case F_SETLK:
375 case F_SETLKW:
376 ret = get_compat_flock(&f, compat_ptr(arg));
377 if (ret != 0)
378 break;
379 old_fs = get_fs();
380 set_fs(KERNEL_DS);
381 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
382 set_fs(old_fs);
383 if (cmd == F_GETLK && ret == 0) {
2520f14c
N		 384 /* GETLK was successfule and we need to return the data...
385 * but it needs to fit in the compat structure.
386 * l_start shouldn't be too big, unless the original
387 * start + end is greater than COMPAT_OFF_T_MAX, in which
388 * case the app was asking for trouble, so we return
389 * -EOVERFLOW in that case.
390 * l_len could be too big, in which case we just truncate it,
391 * and only allow the app to see that part of the conflicting
392 * lock that might make sense to it anyway
393 */
394
395 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 396 ret = -EOVERFLOW;
2520f14c
N		 397 if (f.l_len > COMPAT_OFF_T_MAX)
398 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 399 if (ret == 0)
400 ret = put_compat_flock(&f, compat_ptr(arg));
401 }
402 break;
403
404 case F_GETLK64:
405 case F_SETLK64:
406 case F_SETLKW64:
407 ret = get_compat_flock64(&f, compat_ptr(arg));
408 if (ret != 0)
409 break;
410 old_fs = get_fs();
411 set_fs(KERNEL_DS);
412 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
413 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
414 (unsigned long)&f);
415 set_fs(old_fs);
416 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 417 /* need to return lock information - see above for commentary */
418 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 419 ret = -EOVERFLOW;
2520f14c
N		 420 if (f.l_len > COMPAT_LOFF_T_MAX)
421 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 422 if (ret == 0)
423 ret = put_compat_flock64(&f, compat_ptr(arg));
424 }
425 break;
426
427 default:
428 ret = sys_fcntl(fd, cmd, arg);
429 break;
430 }
431 return ret;
432}
433
434asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
435 unsigned long arg)
436{
437 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
438 return -EINVAL;
439 return compat_sys_fcntl64(fd, cmd, arg);
440}
441
442asmlinkage long
443compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
444{
445 long ret;
446 aio_context_t ctx64;
447
448 mm_segment_t oldfs = get_fs();
449 if (unlikely(get_user(ctx64, ctx32p)))
450 return -EFAULT;
451
452 set_fs(KERNEL_DS);
453 /* The __user pointer cast is valid because of the set_fs() */
454 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
455 set_fs(oldfs);
456 /* truncating is ok because it's a user address */
457 if (!ret)
458 ret = put_user((u32) ctx64, ctx32p);
459 return ret;
460}
461
462asmlinkage long
463compat_sys_io_getevents(aio_context_t ctx_id,
464 unsigned long min_nr,
465 unsigned long nr,
466 struct io_event __user *events,
467 struct compat_timespec __user *timeout)
468{
469 long ret;
470 struct timespec t;
471 struct timespec __user *ut = NULL;
472
473 ret = -EFAULT;
474 if (unlikely(!access_ok(VERIFY_WRITE, events,
475 nr * sizeof(struct io_event))))
476 goto out;
477 if (timeout) {
478 if (get_compat_timespec(&t, timeout))
479 goto out;
480
481 ut = compat_alloc_user_space(sizeof(*ut));
482 if (copy_to_user(ut, &t, sizeof(t)) )
483 goto out;
484 }
485 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
486out:
487 return ret;
488}
489
490static inline long
491copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
492{
493 compat_uptr_t uptr;
494 int i;
495
496 for (i = 0; i < nr; ++i) {
497 if (get_user(uptr, ptr32 + i))
498 return -EFAULT;
499 if (put_user(compat_ptr(uptr), ptr64 + i))
500 return -EFAULT;
501 }
502 return 0;
503}
504
505#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
506
507asmlinkage long
508compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
509{
510 struct iocb __user * __user *iocb64;
511 long ret;
512
513 if (unlikely(nr < 0))
514 return -EINVAL;
515
516 if (nr > MAX_AIO_SUBMITS)
517 nr = MAX_AIO_SUBMITS;
518
519 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
520 ret = copy_iocb(nr, iocb, iocb64);
521 if (!ret)
522 ret = sys_io_submit(ctx_id, nr, iocb64);
523 return ret;
524}
525
526struct compat_ncp_mount_data {
527 compat_int_t version;
528 compat_uint_t ncp_fd;
202e5979 529 __compat_uid_t mounted_uid;
1da177e4
LT		 530 compat_pid_t wdog_pid;
531 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
532 compat_uint_t time_out;
533 compat_uint_t retry_count;
534 compat_uint_t flags;
202e5979
SR		 535 __compat_uid_t uid;
536 __compat_gid_t gid;
1da177e4
LT		 537 compat_mode_t file_mode;
538 compat_mode_t dir_mode;
539};
540
541struct compat_ncp_mount_data_v4 {
542 compat_int_t version;
543 compat_ulong_t flags;
544 compat_ulong_t mounted_uid;
545 compat_long_t wdog_pid;
546 compat_uint_t ncp_fd;
547 compat_uint_t time_out;
548 compat_uint_t retry_count;
549 compat_ulong_t uid;
550 compat_ulong_t gid;
551 compat_ulong_t file_mode;
552 compat_ulong_t dir_mode;
553};
554
555static void *do_ncp_super_data_conv(void *raw_data)
556{
557 int version = *(unsigned int *)raw_data;
558
559 if (version == 3) {
560 struct compat_ncp_mount_data *c_n = raw_data;
561 struct ncp_mount_data *n = raw_data;
562
563 n->dir_mode = c_n->dir_mode;
564 n->file_mode = c_n->file_mode;
565 n->gid = c_n->gid;
566 n->uid = c_n->uid;
567 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
568 n->wdog_pid = c_n->wdog_pid;
569 n->mounted_uid = c_n->mounted_uid;
570 } else if (version == 4) {
571 struct compat_ncp_mount_data_v4 *c_n = raw_data;
572 struct ncp_mount_data_v4 *n = raw_data;
573
574 n->dir_mode = c_n->dir_mode;
575 n->file_mode = c_n->file_mode;
576 n->gid = c_n->gid;
577 n->uid = c_n->uid;
578 n->retry_count = c_n->retry_count;
579 n->time_out = c_n->time_out;
580 n->ncp_fd = c_n->ncp_fd;
581 n->wdog_pid = c_n->wdog_pid;
582 n->mounted_uid = c_n->mounted_uid;
583 n->flags = c_n->flags;
584 } else if (version != 5) {
585 return NULL;
586 }
587
588 return raw_data;
589}
590
591struct compat_smb_mount_data {
592 compat_int_t version;
202e5979
SR		 593 __compat_uid_t mounted_uid;
594 __compat_uid_t uid;
595 __compat_gid_t gid;
1da177e4
LT		 596 compat_mode_t file_mode;
597 compat_mode_t dir_mode;
598};
599
600static void *do_smb_super_data_conv(void *raw_data)
601{
602 struct smb_mount_data *s = raw_data;
603 struct compat_smb_mount_data *c_s = raw_data;
604
605 if (c_s->version != SMB_MOUNT_OLDVERSION)
606 goto out;
607 s->dir_mode = c_s->dir_mode;
608 s->file_mode = c_s->file_mode;
609 s->gid = c_s->gid;
610 s->uid = c_s->uid;
611 s->mounted_uid = c_s->mounted_uid;
612 out:
613 return raw_data;
614}
615
9a9947bf
DH		 616struct compat_nfs_string {
617 compat_uint_t len;
5fc3e624 618 compat_uptr_t data;
9a9947bf
DH		 619};
620
621static inline void compat_nfs_string(struct nfs_string *dst,
622 struct compat_nfs_string *src)
623{
624 dst->data = compat_ptr(src->data);
625 dst->len = src->len;
626}
627
628struct compat_nfs4_mount_data_v1 {
629 compat_int_t version;
630 compat_int_t flags;
631 compat_int_t rsize;
632 compat_int_t wsize;
633 compat_int_t timeo;
634 compat_int_t retrans;
635 compat_int_t acregmin;
636 compat_int_t acregmax;
637 compat_int_t acdirmin;
638 compat_int_t acdirmax;
639 struct compat_nfs_string client_addr;
640 struct compat_nfs_string mnt_path;
641 struct compat_nfs_string hostname;
642 compat_uint_t host_addrlen;
5fc3e624 643 compat_uptr_t host_addr;
9a9947bf
DH		 644 compat_int_t proto;
645 compat_int_t auth_flavourlen;
5fc3e624 646 compat_uptr_t auth_flavours;
9a9947bf
DH		 647};
648
649static int do_nfs4_super_data_conv(void *raw_data)
650{
651 int version = *(compat_uint_t *) raw_data;
652
653 if (version == 1) {
654 struct compat_nfs4_mount_data_v1 *raw = raw_data;
655 struct nfs4_mount_data *real = raw_data;
656
657 /* copy the fields backwards */
658 real->auth_flavours = compat_ptr(raw->auth_flavours);
659 real->auth_flavourlen = raw->auth_flavourlen;
660 real->proto = raw->proto;
661 real->host_addr = compat_ptr(raw->host_addr);
662 real->host_addrlen = raw->host_addrlen;
663 compat_nfs_string(&real->hostname, &raw->hostname);
664 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
665 compat_nfs_string(&real->client_addr, &raw->client_addr);
666 real->acdirmax = raw->acdirmax;
667 real->acdirmin = raw->acdirmin;
668 real->acregmax = raw->acregmax;
669 real->acregmin = raw->acregmin;
670 real->retrans = raw->retrans;
671 real->timeo = raw->timeo;
672 real->wsize = raw->wsize;
673 real->rsize = raw->rsize;
674 real->flags = raw->flags;
675 real->version = raw->version;
676 }
677 else {
678 return -EINVAL;
679 }
680
681 return 0;
682}
683
1da177e4
LT		 684#define SMBFS_NAME "smbfs"
685#define NCPFS_NAME "ncpfs"
9a9947bf 686#define NFS4_NAME "nfs4"
1da177e4
LT		 687
688asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
689 char __user * type, unsigned long flags,
690 void __user * data)
691{
692 unsigned long type_page;
693 unsigned long data_page;
694 unsigned long dev_page;
695 char *dir_page;
696 int retval;
697
698 retval = copy_mount_options (type, &type_page);
699 if (retval < 0)
700 goto out;
701
702 dir_page = getname(dir_name);
703 retval = PTR_ERR(dir_page);
704 if (IS_ERR(dir_page))
705 goto out1;
706
707 retval = copy_mount_options (dev_name, &dev_page);
708 if (retval < 0)
709 goto out2;
710
711 retval = copy_mount_options (data, &data_page);
712 if (retval < 0)
713 goto out3;
714
715 retval = -EINVAL;
716
822191a2 717 if (type_page && data_page) {
1da177e4
LT		 718 if (!strcmp((char *)type_page, SMBFS_NAME)) {
719 do_smb_super_data_conv((void *)data_page);
720 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
721 do_ncp_super_data_conv((void *)data_page);
9a9947bf
DH		 722 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
723 if (do_nfs4_super_data_conv((void *) data_page))
724 goto out4;
1da177e4
LT		 725 }
726 }
727
728 lock_kernel();
729 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
730 flags, (void*)data_page);
731 unlock_kernel();
732
9a9947bf 733 out4:
1da177e4
LT		 734 free_page(data_page);
735 out3:
736 free_page(dev_page);
737 out2:
738 putname(dir_page);
739 out1:
740 free_page(type_page);
741 out:
742 return retval;
743}
744
745#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
1da177e4
LT		 746
747struct compat_old_linux_dirent {
748 compat_ulong_t d_ino;
749 compat_ulong_t d_offset;
750 unsigned short d_namlen;
751 char d_name[1];
752};
753
754struct compat_readdir_callback {
755 struct compat_old_linux_dirent __user *dirent;
756 int result;
757};
758
759static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 760 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 761{
762 struct compat_readdir_callback *buf = __buf;
763 struct compat_old_linux_dirent __user *dirent;
afefdbb2 764 compat_ulong_t d_ino;
1da177e4
LT		 765
766 if (buf->result)
767 return -EINVAL;
afefdbb2
DH		 768 d_ino = ino;
769 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
770 return -EOVERFLOW;
1da177e4
LT		 771 buf->result++;
772 dirent = buf->dirent;
773 if (!access_ok(VERIFY_WRITE, dirent,
774 (unsigned long)(dirent->d_name + namlen + 1) -
775 (unsigned long)dirent))
776 goto efault;
afefdbb2 777 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 778 __put_user(offset, &dirent->d_offset) ||
779 __put_user(namlen, &dirent->d_namlen) ||
780 __copy_to_user(dirent->d_name, name, namlen) ||
781 __put_user(0, dirent->d_name + namlen))
782 goto efault;
783 return 0;
784efault:
785 buf->result = -EFAULT;
786 return -EFAULT;
787}
788
789asmlinkage long compat_sys_old_readdir(unsigned int fd,
790 struct compat_old_linux_dirent __user *dirent, unsigned int count)
791{
792 int error;
793 struct file *file;
794 struct compat_readdir_callback buf;
795
796 error = -EBADF;
797 file = fget(fd);
798 if (!file)
799 goto out;
800
801 buf.result = 0;
802 buf.dirent = dirent;
803
804 error = vfs_readdir(file, compat_fillonedir, &buf);
805 if (error >= 0)
806 error = buf.result;
807
808 fput(file);
809out:
810 return error;
811}
812
813struct compat_linux_dirent {
814 compat_ulong_t d_ino;
815 compat_ulong_t d_off;
816 unsigned short d_reclen;
817 char d_name[1];
818};
819
820struct compat_getdents_callback {
821 struct compat_linux_dirent __user *current_dir;
822 struct compat_linux_dirent __user *previous;
823 int count;
824 int error;
825};
826
827static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 828 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 829{
830 struct compat_linux_dirent __user * dirent;
831 struct compat_getdents_callback *buf = __buf;
afefdbb2 832 compat_ulong_t d_ino;
022a1692 833 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 834
835 buf->error = -EINVAL; /* only used if we fail.. */
836 if (reclen > buf->count)
837 return -EINVAL;
afefdbb2
DH		 838 d_ino = ino;
839 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
840 return -EOVERFLOW;
1da177e4
LT		 841 dirent = buf->previous;
842 if (dirent) {
843 if (__put_user(offset, &dirent->d_off))
844 goto efault;
845 }
846 dirent = buf->current_dir;
afefdbb2 847 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 848 goto efault;
849 if (__put_user(reclen, &dirent->d_reclen))
850 goto efault;
851 if (copy_to_user(dirent->d_name, name, namlen))
852 goto efault;
853 if (__put_user(0, dirent->d_name + namlen))
854 goto efault;
855 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
856 goto efault;
857 buf->previous = dirent;
858 dirent = (void __user *)dirent + reclen;
859 buf->current_dir = dirent;
860 buf->count -= reclen;
861 return 0;
862efault:
863 buf->error = -EFAULT;
864 return -EFAULT;
865}
866
867asmlinkage long compat_sys_getdents(unsigned int fd,
868 struct compat_linux_dirent __user *dirent, unsigned int count)
869{
870 struct file * file;
871 struct compat_linux_dirent __user * lastdirent;
872 struct compat_getdents_callback buf;
873 int error;
874
875 error = -EFAULT;
876 if (!access_ok(VERIFY_WRITE, dirent, count))
877 goto out;
878
879 error = -EBADF;
880 file = fget(fd);
881 if (!file)
882 goto out;
883
884 buf.current_dir = dirent;
885 buf.previous = NULL;
886 buf.count = count;
887 buf.error = 0;
888
889 error = vfs_readdir(file, compat_filldir, &buf);
890 if (error < 0)
891 goto out_putf;
892 error = buf.error;
893 lastdirent = buf.previous;
894 if (lastdirent) {
895 if (put_user(file->f_pos, &lastdirent->d_off))
896 error = -EFAULT;
897 else
898 error = count - buf.count;
899 }
900
901out_putf:
902 fput(file);
903out:
904 return error;
905}
906
907#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 908
909struct compat_getdents_callback64 {
910 struct linux_dirent64 __user *current_dir;
911 struct linux_dirent64 __user *previous;
912 int count;
913 int error;
914};
915
916static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 917 u64 ino, unsigned int d_type)
1da177e4
LT		 918{
919 struct linux_dirent64 __user *dirent;
920 struct compat_getdents_callback64 *buf = __buf;
921 int jj = NAME_OFFSET(dirent);
022a1692 922 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1da177e4
LT		 923 u64 off;
924
925 buf->error = -EINVAL; /* only used if we fail.. */
926 if (reclen > buf->count)
927 return -EINVAL;
928 dirent = buf->previous;
929
930 if (dirent) {
931 if (__put_user_unaligned(offset, &dirent->d_off))
932 goto efault;
933 }
934 dirent = buf->current_dir;
935 if (__put_user_unaligned(ino, &dirent->d_ino))
936 goto efault;
937 off = 0;
938 if (__put_user_unaligned(off, &dirent->d_off))
939 goto efault;
940 if (__put_user(reclen, &dirent->d_reclen))
941 goto efault;
942 if (__put_user(d_type, &dirent->d_type))
943 goto efault;
944 if (copy_to_user(dirent->d_name, name, namlen))
945 goto efault;
946 if (__put_user(0, dirent->d_name + namlen))
947 goto efault;
948 buf->previous = dirent;
949 dirent = (void __user *)dirent + reclen;
950 buf->current_dir = dirent;
951 buf->count -= reclen;
952 return 0;
953efault:
954 buf->error = -EFAULT;
955 return -EFAULT;
956}
957
958asmlinkage long compat_sys_getdents64(unsigned int fd,
959 struct linux_dirent64 __user * dirent, unsigned int count)
960{
961 struct file * file;
962 struct linux_dirent64 __user * lastdirent;
963 struct compat_getdents_callback64 buf;
964 int error;
965
966 error = -EFAULT;
967 if (!access_ok(VERIFY_WRITE, dirent, count))
968 goto out;
969
970 error = -EBADF;
971 file = fget(fd);
972 if (!file)
973 goto out;
974
975 buf.current_dir = dirent;
976 buf.previous = NULL;
977 buf.count = count;
978 buf.error = 0;
979
980 error = vfs_readdir(file, compat_filldir64, &buf);
981 if (error < 0)
982 goto out_putf;
983 error = buf.error;
984 lastdirent = buf.previous;
985 if (lastdirent) {
986 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994
HC		 987 error = -EFAULT;
988 if (__put_user_unaligned(d_off, &lastdirent->d_off))
989 goto out_putf;
1da177e4
LT		 990 error = count - buf.count;
991 }
992
993out_putf:
994 fput(file);
995out:
996 return error;
997}
998#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
999
1000static ssize_t compat_do_readv_writev(int type, struct file *file,
1001 const struct compat_iovec __user *uvector,
1002 unsigned long nr_segs, loff_t *pos)
1003{
1da177e4
LT		 1004 compat_ssize_t tot_len;
1005 struct iovec iovstack[UIO_FASTIOV];
1006 struct iovec *iov=iovstack, *vector;
1007 ssize_t ret;
1008 int seg;
1009 io_fn_t fn;
1010 iov_fn_t fnv;
1011
1012 /*
1013 * SuS says "The readv() function *may* fail if the iovcnt argument
1014 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1015 * traditionally returned zero for zero segments, so...
1016 */
1017 ret = 0;
1018 if (nr_segs == 0)
1019 goto out;
1020
1021 /*
1022 * First get the "struct iovec" from user memory and
1023 * verify all the pointers
1024 */
1025 ret = -EINVAL;
1026 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1027 goto out;
1028 if (!file->f_op)
1029 goto out;
1030 if (nr_segs > UIO_FASTIOV) {
1031 ret = -ENOMEM;
1032 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1033 if (!iov)
1034 goto out;
1035 }
1036 ret = -EFAULT;
1037 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1038 goto out;
1039
1040 /*
1041 * Single unix specification:
1042 * We should -EINVAL if an element length is not >= 0 and fitting an
1043 * ssize_t. The total length is fitting an ssize_t
1044 *
1045 * Be careful here because iov_len is a size_t not an ssize_t
1046 */
1047 tot_len = 0;
1048 vector = iov;
1049 ret = -EINVAL;
1050 for (seg = 0 ; seg < nr_segs; seg++) {
1051 compat_ssize_t tmp = tot_len;
1052 compat_ssize_t len;
1053 compat_uptr_t buf;
1054
1055 if (__get_user(len, &uvector->iov_len) ||
1056 __get_user(buf, &uvector->iov_base)) {
1057 ret = -EFAULT;
1058 goto out;
1059 }
1060 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1061 goto out;
1062 tot_len += len;
1063 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1064 goto out;
1065 vector->iov_base = compat_ptr(buf);
1066 vector->iov_len = (compat_size_t) len;
1067 uvector++;
1068 vector++;
1069 }
1070 if (tot_len == 0) {
1071 ret = 0;
1072 goto out;
1073 }
1074
1075 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1076 if (ret < 0)
1da177e4
LT		 1077 goto out;
1078
e7edf9cd
JM		 1079 ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
1080 if (ret)
1081 goto out;
1082
1da177e4
LT		 1083 fnv = NULL;
1084 if (type == READ) {
1085 fn = file->f_op->read;
ee0b3e67 1086 fnv = file->f_op->aio_read;
1da177e4
LT		 1087 } else {
1088 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1089 fnv = file->f_op->aio_write;
1da177e4
LT		 1090 }
1091
ee0b3e67
BP		 1092 if (fnv)
1093 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1094 pos, fnv);
1095 else
1096 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1097
1da177e4
LT		 1098out:
1099 if (iov != iovstack)
1100 kfree(iov);
0eeca283 1101 if ((ret + (type == READ)) > 0) {
0f7fc9e4 1102 struct dentry *dentry = file->f_path.dentry;
0eeca283
RL		 1103 if (type == READ)
1104 fsnotify_access(dentry);
1105 else
1106 fsnotify_modify(dentry);
1107 }
1da177e4
LT		 1108 return ret;
1109}
1110
1111asmlinkage ssize_t
1112compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1113{
1114 struct file *file;
1115 ssize_t ret = -EBADF;
1116
1117 file = fget(fd);
1118 if (!file)
1119 return -EBADF;
1120
1121 if (!(file->f_mode & FMODE_READ))
1122 goto out;
1123
1124 ret = -EINVAL;
ee0b3e67 1125 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1126 goto out;
1127
1128 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1129
1130out:
1131 fput(file);
1132 return ret;
1133}
1134
1135asmlinkage ssize_t
1136compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1137{
1138 struct file *file;
1139 ssize_t ret = -EBADF;
1140
1141 file = fget(fd);
1142 if (!file)
1143 return -EBADF;
1144 if (!(file->f_mode & FMODE_WRITE))
1145 goto out;
1146
1147 ret = -EINVAL;
ee0b3e67 1148 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1149 goto out;
1150
1151 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1152
1153out:
1154 fput(file);
1155 return ret;
1156}
1157
d2610202
AK		 1158asmlinkage long
1159compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1160 unsigned int nr_segs, unsigned int flags)
1161{
1162 unsigned i;
90cbad65 1163 struct iovec __user *iov;
98232d50 1164 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1165 return -EINVAL;
1166 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1167 for (i = 0; i < nr_segs; i++) {
1168 struct compat_iovec v;
1169 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1170 get_user(v.iov_len, &iov32[i].iov_len) ||
1171 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1172 put_user(v.iov_len, &iov[i].iov_len))
1173 return -EFAULT;
1174 }
1175 return sys_vmsplice(fd, iov, nr_segs, flags);
1176}
1177
e922efc3
MS		 1178/*
1179 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1180 * O_LARGEFILE flag.
1181 */
1182asmlinkage long
1183compat_sys_open(const char __user *filename, int flags, int mode)
1184{
5590ff0d
UD		 1185 return do_sys_open(AT_FDCWD, filename, flags, mode);
1186}
1187
1188/*
1189 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1190 * O_LARGEFILE flag.
1191 */
1192asmlinkage long
9ad11ab4 1193compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1194{
1195 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1196}
1197
1da177e4
LT		 1198/*
1199 * compat_count() counts the number of arguments/envelopes. It is basically
1200 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1201 * and envp pointers.
1202 */
1203static int compat_count(compat_uptr_t __user *argv, int max)
1204{
1205 int i = 0;
1206
1207 if (argv != NULL) {
1208 for (;;) {
1209 compat_uptr_t p;
1210
1211 if (get_user(p, argv))
1212 return -EFAULT;
1213 if (!p)
1214 break;
1215 argv++;
1216 if(++i > max)
1217 return -E2BIG;
1218 }
1219 }
1220 return i;
1221}
1222
1223/*
1224 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1225 * except that it works with 32 bit argv and envp pointers.
1226 */
1227static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1228 struct linux_binprm *bprm)
1229{
1230 struct page *kmapped_page = NULL;
1231 char *kaddr = NULL;
1232 int ret;
1233
1234 while (argc-- > 0) {
1235 compat_uptr_t str;
1236 int len;
1237 unsigned long pos;
1238
1239 if (get_user(str, argv+argc) ||
1240 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1241 ret = -EFAULT;
1242 goto out;
1243 }
1244
1245 if (bprm->p < len) {
1246 ret = -E2BIG;
1247 goto out;
1248 }
1249
1250 bprm->p -= len;
1251 /* XXX: add architecture specific overflow check here. */
1252 pos = bprm->p;
1253
1254 while (len > 0) {
1255 int i, new, err;
1256 int offset, bytes_to_copy;
1257 struct page *page;
1258
1259 offset = pos % PAGE_SIZE;
1260 i = pos/PAGE_SIZE;
1261 page = bprm->page[i];
1262 new = 0;
1263 if (!page) {
1264 page = alloc_page(GFP_HIGHUSER);
1265 bprm->page[i] = page;
1266 if (!page) {
1267 ret = -ENOMEM;
1268 goto out;
1269 }
1270 new = 1;
1271 }
1272
1273 if (page != kmapped_page) {
1274 if (kmapped_page)
1275 kunmap(kmapped_page);
1276 kmapped_page = page;
1277 kaddr = kmap(kmapped_page);
1278 }
1279 if (new && offset)
1280 memset(kaddr, 0, offset);
1281 bytes_to_copy = PAGE_SIZE - offset;
1282 if (bytes_to_copy > len) {
1283 bytes_to_copy = len;
1284 if (new)
1285 memset(kaddr+offset+len, 0,
1286 PAGE_SIZE-offset-len);
1287 }
1288 err = copy_from_user(kaddr+offset, compat_ptr(str),
1289 bytes_to_copy);
1290 if (err) {
1291 ret = -EFAULT;
1292 goto out;
1293 }
1294
1295 pos += bytes_to_copy;
1296 str += bytes_to_copy;
1297 len -= bytes_to_copy;
1298 }
1299 }
1300 ret = 0;
1301out:
1302 if (kmapped_page)
1303 kunmap(kmapped_page);
1304 return ret;
1305}
1306
1307#ifdef CONFIG_MMU
1308
1309#define free_arg_pages(bprm) do { } while (0)
1310
1311#else
1312
1313static inline void free_arg_pages(struct linux_binprm *bprm)
1314{
1315 int i;
1316
1317 for (i = 0; i < MAX_ARG_PAGES; i++) {
1318 if (bprm->page[i])
1319 __free_page(bprm->page[i]);
1320 bprm->page[i] = NULL;
1321 }
1322}
1323
1324#endif /* CONFIG_MMU */
1325
1326/*
1327 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1328 * that it processes 32 bit argv and envp pointers.
1329 */
1330int compat_do_execve(char * filename,
1331 compat_uptr_t __user *argv,
1332 compat_uptr_t __user *envp,
1333 struct pt_regs * regs)
1334{
1335 struct linux_binprm *bprm;
1336 struct file *file;
1337 int retval;
1338 int i;
1339
1340 retval = -ENOMEM;
11b0b5ab 1341 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4
LT		 1342 if (!bprm)
1343 goto out_ret;
1da177e4
LT		 1344
1345 file = open_exec(filename);
1346 retval = PTR_ERR(file);
1347 if (IS_ERR(file))
1348 goto out_kfree;
1349
1350 sched_exec();
1351
1352 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1353 bprm->file = file;
1354 bprm->filename = filename;
1355 bprm->interp = filename;
1356 bprm->mm = mm_alloc();
1357 retval = -ENOMEM;
1358 if (!bprm->mm)
1359 goto out_file;
1360
1361 retval = init_new_context(current, bprm->mm);
1362 if (retval < 0)
1363 goto out_mm;
1364
1365 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1366 if ((retval = bprm->argc) < 0)
1367 goto out_mm;
1368
1369 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1370 if ((retval = bprm->envc) < 0)
1371 goto out_mm;
1372
1373 retval = security_bprm_alloc(bprm);
1374 if (retval)
1375 goto out;
1376
1377 retval = prepare_binprm(bprm);
1378 if (retval < 0)
1379 goto out;
1380
1381 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1382 if (retval < 0)
1383 goto out;
1384
1385 bprm->exec = bprm->p;
1386 retval = compat_copy_strings(bprm->envc, envp, bprm);
1387 if (retval < 0)
1388 goto out;
1389
1390 retval = compat_copy_strings(bprm->argc, argv, bprm);
1391 if (retval < 0)
1392 goto out;
1393
1394 retval = search_binary_handler(bprm, regs);
1395 if (retval >= 0) {
1396 free_arg_pages(bprm);
1397
1398 /* execve success */
1399 security_bprm_free(bprm);
4a805e86 1400 acct_update_integrals(current);
1da177e4
LT		 1401 kfree(bprm);
1402 return retval;
1403 }
1404
1405out:
1406 /* Something went wrong, return the inode and free the argument pages*/
1407 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1408 struct page * page = bprm->page[i];
1409 if (page)
1410 __free_page(page);
1411 }
1412
1413 if (bprm->security)
1414 security_bprm_free(bprm);
1415
1416out_mm:
1417 if (bprm->mm)
1418 mmdrop(bprm->mm);
1419
1420out_file:
1421 if (bprm->file) {
1422 allow_write_access(bprm->file);
1423 fput(bprm->file);
1424 }
1425
1426out_kfree:
1427 kfree(bprm);
1428
1429out_ret:
1430 return retval;
1431}
1432
1433#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1434
1da177e4
LT		 1435/*
1436 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1437 * 64-bit unsigned longs.
1438 */
858119e1 1439static
1da177e4
LT		 1440int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1441 unsigned long *fdset)
1442{
022a1692 1443 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 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;
7116e994
HC		 1454 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1455 return -EFAULT;
1da177e4
LT		 1456 ufdset += 2;
1457 *fdset++ = h << 32 | l;
1458 nr -= 2;
1459 }
7116e994
HC		 1460 if (odd && __get_user(*fdset, ufdset))
1461 return -EFAULT;
1da177e4
LT		 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
858119e1 1472static
7116e994
HC		 1473int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1474 unsigned long *fdset)
1da177e4
LT		 1475{
1476 unsigned long odd;
022a1692 1477 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1478
1479 if (!ufdset)
7116e994 1480 return 0;
1da177e4
LT		 1481
1482 odd = nr & 1UL;
1483 nr &= ~1UL;
1484 while (nr) {
1485 unsigned long h, l;
1486 l = *fdset++;
1487 h = l >> 32;
7116e994
HC		 1488 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1489 return -EFAULT;
1da177e4
LT		 1490 ufdset += 2;
1491 nr -= 2;
1492 }
7116e994
HC		 1493 if (odd && __put_user(*fdset, ufdset))
1494 return -EFAULT;
1495 return 0;
1da177e4
LT		 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 */
1da177e4
LT		 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
9f72949f
DW		 1515int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1516 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1da177e4
LT		 1517{
1518 fd_set_bits fds;
1519 char *bits;
bbea9f69 1520 int size, max_fds, ret = -EINVAL;
a4531edd 1521 struct fdtable *fdt;
1da177e4 1522
1da177e4
LT		 1523 if (n < 0)
1524 goto out_nofds;
1525
bbea9f69 1526 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1527 rcu_read_lock();
a4531edd 1528 fdt = files_fdtable(current->files);
bbea9f69 1529 max_fds = fdt->max_fds;
ac5b8b6f 1530 rcu_read_unlock();
bbea9f69
VL		 1531 if (n > max_fds)
1532 n = max_fds;
1da177e4
LT		 1533
1534 /*
1535 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1536 * since we used fdset we need to allocate memory in units of
1537 * long-words.
1538 */
1539 ret = -ENOMEM;
1540 size = FDS_BYTES(n);
68c3431a 1541 bits = kmalloc(6 * size, GFP_KERNEL);
1da177e4
LT		 1542 if (!bits)
1543 goto out_nofds;
1544 fds.in = (unsigned long *) bits;
1545 fds.out = (unsigned long *) (bits + size);
1546 fds.ex = (unsigned long *) (bits + 2*size);
1547 fds.res_in = (unsigned long *) (bits + 3*size);
1548 fds.res_out = (unsigned long *) (bits + 4*size);
1549 fds.res_ex = (unsigned long *) (bits + 5*size);
1550
1551 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1552 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1553 (ret = compat_get_fd_set(n, exp, fds.ex)))
1554 goto out;
1555 zero_fd_set(n, fds.res_in);
1556 zero_fd_set(n, fds.res_out);
1557 zero_fd_set(n, fds.res_ex);
1558
9f72949f 1559 ret = do_select(n, &fds, timeout);
1da177e4
LT		 1560
1561 if (ret < 0)
1562 goto out;
1563 if (!ret) {
1564 ret = -ERESTARTNOHAND;
1565 if (signal_pending(current))
1566 goto out;
1567 ret = 0;
1568 }
1569
7116e994
HC		 1570 if (compat_set_fd_set(n, inp, fds.res_in) ||
1571 compat_set_fd_set(n, outp, fds.res_out) ||
1572 compat_set_fd_set(n, exp, fds.res_ex))
1573 ret = -EFAULT;
1da177e4 1574out:
68c3431a 1575 kfree(bits);
1da177e4
LT		 1576out_nofds:
1577 return ret;
1578}
1579
9f72949f
DW		 1580asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1581 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1582 struct compat_timeval __user *tvp)
1583{
1584 s64 timeout = -1;
1585 struct compat_timeval tv;
1586 int ret;
1587
1588 if (tvp) {
1589 if (copy_from_user(&tv, tvp, sizeof(tv)))
1590 return -EFAULT;
1591
1592 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1593 return -EINVAL;
1594
1595 /* Cast to u64 to make GCC stop complaining */
1596 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1597 timeout = -1; /* infinite */
1598 else {
022a1692 1599 timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
9f72949f
DW		 1600 timeout += tv.tv_sec * HZ;
1601 }
1602 }
1603
1604 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1605
1606 if (tvp) {
643a6545
AM		 1607 struct compat_timeval rtv;
1608
9f72949f
DW		 1609 if (current->personality & STICKY_TIMEOUTS)
1610 goto sticky;
643a6545
AM		 1611 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1612 rtv.tv_sec = timeout;
74910e6c 1613 if (compat_timeval_compare(&rtv, &tv) >= 0)
643a6545
AM		 1614 rtv = tv;
1615 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
9f72949f
DW		 1616sticky:
1617 /*
1618 * If an application puts its timeval in read-only
1619 * memory, we don't want the Linux-specific update to
1620 * the timeval to cause a fault after the select has
1621 * completed successfully. However, because we're not
1622 * updating the timeval, we can't restart the system
1623 * call.
1624 */
1625 if (ret == -ERESTARTNOHAND)
1626 ret = -EINTR;
1627 }
1628 }
1629
1630 return ret;
1631}
1632
1633#ifdef TIF_RESTORE_SIGMASK
1634asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1635 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1636 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1637 compat_size_t sigsetsize)
1638{
1639 compat_sigset_t ss32;
1640 sigset_t ksigmask, sigsaved;
cb82a6cd 1641 s64 timeout = MAX_SCHEDULE_TIMEOUT;
9f72949f
DW		 1642 struct compat_timespec ts;
1643 int ret;
1644
1645 if (tsp) {
1646 if (copy_from_user(&ts, tsp, sizeof(ts)))
1647 return -EFAULT;
1648
1649 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1650 return -EINVAL;
1651 }
1652
1653 if (sigmask) {
1654 if (sigsetsize != sizeof(compat_sigset_t))
1655 return -EINVAL;
1656 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1657 return -EFAULT;
1658 sigset_from_compat(&ksigmask, &ss32);
1659
1660 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1661 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1662 }
1663
1664 do {
1665 if (tsp) {
1666 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
022a1692 1667 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
9f72949f
DW		 1668 timeout += ts.tv_sec * (unsigned long)HZ;
1669 ts.tv_sec = 0;
1670 ts.tv_nsec = 0;
1671 } else {
1672 ts.tv_sec -= MAX_SELECT_SECONDS;
1673 timeout = MAX_SELECT_SECONDS * HZ;
1674 }
1675 }
1676
1677 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1678
1679 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1680
87c2b7c0 1681 if (tsp) {
643a6545
AM		 1682 struct compat_timespec rts;
1683
87c2b7c0
HC		 1684 if (current->personality & STICKY_TIMEOUTS)
1685 goto sticky;
1686
643a6545
AM		 1687 rts.tv_sec = timeout / HZ;
1688 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1689 if (rts.tv_nsec >= NSEC_PER_SEC) {
1690 rts.tv_sec++;
1691 rts.tv_nsec -= NSEC_PER_SEC;
9f72949f 1692 }
74910e6c 1693 if (compat_timespec_compare(&rts, &ts) >= 0)
643a6545 1694 rts = ts;
87c2b7c0
HC		 1695 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1696sticky:
1697 /*
1698 * If an application puts its timeval in read-only
1699 * memory, we don't want the Linux-specific update to
1700 * the timeval to cause a fault after the select has
1701 * completed successfully. However, because we're not
1702 * updating the timeval, we can't restart the system
1703 * call.
1704 */
1705 if (ret == -ERESTARTNOHAND)
1706 ret = -EINTR;
1707 }
9f72949f
DW		 1708 }
1709
1710 if (ret == -ERESTARTNOHAND) {
1711 /*
1712 * Don't restore the signal mask yet. Let do_signal() deliver
1713 * the signal on the way back to userspace, before the signal
1714 * mask is restored.
1715 */
1716 if (sigmask) {
1717 memcpy(&current->saved_sigmask, &sigsaved,
1718 sizeof(sigsaved));
1719 set_thread_flag(TIF_RESTORE_SIGMASK);
1720 }
1721 } else if (sigmask)
1722 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1723
1724 return ret;
1725}
1726
1727asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1728 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1729 struct compat_timespec __user *tsp, void __user *sig)
1730{
1731 compat_size_t sigsetsize = 0;
1732 compat_uptr_t up = 0;
1733
1734 if (sig) {
1735 if (!access_ok(VERIFY_READ, sig,
1736 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1737 __get_user(up, (compat_uptr_t __user *)sig) ||
1738 __get_user(sigsetsize,
1739 (compat_size_t __user *)(sig+sizeof(up))))
1740 return -EFAULT;
1741 }
1742 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1743 sigsetsize);
1744}
1745
1746asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1747 unsigned int nfds, struct compat_timespec __user *tsp,
1748 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1749{
1750 compat_sigset_t ss32;
1751 sigset_t ksigmask, sigsaved;
1752 struct compat_timespec ts;
1753 s64 timeout = -1;
1754 int ret;
1755
1756 if (tsp) {
1757 if (copy_from_user(&ts, tsp, sizeof(ts)))
1758 return -EFAULT;
1759
1760 /* We assume that ts.tv_sec is always lower than
1761 the number of seconds that can be expressed in
1762 an s64. Otherwise the compiler bitches at us */
022a1692 1763 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
9f72949f
DW		 1764 timeout += ts.tv_sec * HZ;
1765 }
1766
1767 if (sigmask) {
3835a9bd 1768 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1769 return -EINVAL;
1770 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1771 return -EFAULT;
1772 sigset_from_compat(&ksigmask, &ss32);
1773
1774 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1775 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1776 }
1777
1778 ret = do_sys_poll(ufds, nfds, &timeout);
1779
1780 /* We can restart this syscall, usually */
1781 if (ret == -EINTR) {
1782 /*
1783 * Don't restore the signal mask yet. Let do_signal() deliver
1784 * the signal on the way back to userspace, before the signal
1785 * mask is restored.
1786 */
1787 if (sigmask) {
1788 memcpy(&current->saved_sigmask, &sigsaved,
1789 sizeof(sigsaved));
1790 set_thread_flag(TIF_RESTORE_SIGMASK);
1791 }
1792 ret = -ERESTARTNOHAND;
1793 } else if (sigmask)
1794 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1795
1796 if (tsp && timeout >= 0) {
643a6545
AM		 1797 struct compat_timespec rts;
1798
9f72949f
DW		 1799 if (current->personality & STICKY_TIMEOUTS)
1800 goto sticky;
1801 /* Yes, we know it's actually an s64, but it's also positive. */
643a6545
AM		 1802 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1803 1000;
1804 rts.tv_sec = timeout;
74910e6c 1805 if (compat_timespec_compare(&rts, &ts) >= 0)
643a6545
AM		 1806 rts = ts;
1807 if (copy_to_user(tsp, &rts, sizeof(rts))) {
9f72949f
DW		 1808sticky:
1809 /*
1810 * If an application puts its timeval in read-only
1811 * memory, we don't want the Linux-specific update to
1812 * the timeval to cause a fault after the select has
1813 * completed successfully. However, because we're not
1814 * updating the timeval, we can't restart the system
1815 * call.
1816 */
1817 if (ret == -ERESTARTNOHAND && timeout >= 0)
1818 ret = -EINTR;
1819 }
1820 }
1821
1822 return ret;
1823}
1824#endif /* TIF_RESTORE_SIGMASK */
1825
1da177e4
LT		 1826#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1827/* Stuff for NFS server syscalls... */
1828struct compat_nfsctl_svc {
1829 u16 svc32_port;
1830 s32 svc32_nthreads;
1831};
1832
1833struct compat_nfsctl_client {
1834 s8 cl32_ident[NFSCLNT_IDMAX+1];
1835 s32 cl32_naddr;
1836 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1837 s32 cl32_fhkeytype;
1838 s32 cl32_fhkeylen;
1839 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1840};
1841
1842struct compat_nfsctl_export {
1843 char ex32_client[NFSCLNT_IDMAX+1];
1844 char ex32_path[NFS_MAXPATHLEN+1];
1845 compat_dev_t ex32_dev;
1846 compat_ino_t ex32_ino;
1847 compat_int_t ex32_flags;
202e5979
SR		 1848 __compat_uid_t ex32_anon_uid;
1849 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1850};
1851
1852struct compat_nfsctl_fdparm {
1853 struct sockaddr gd32_addr;
1854 s8 gd32_path[NFS_MAXPATHLEN+1];
1855 compat_int_t gd32_version;
1856};
1857
1858struct compat_nfsctl_fsparm {
1859 struct sockaddr gd32_addr;
1860 s8 gd32_path[NFS_MAXPATHLEN+1];
1861 compat_int_t gd32_maxlen;
1862};
1863
1864struct compat_nfsctl_arg {
1865 compat_int_t ca32_version; /* safeguard */
1866 union {
1867 struct compat_nfsctl_svc u32_svc;
1868 struct compat_nfsctl_client u32_client;
1869 struct compat_nfsctl_export u32_export;
1870 struct compat_nfsctl_fdparm u32_getfd;
1871 struct compat_nfsctl_fsparm u32_getfs;
1872 } u;
1873#define ca32_svc u.u32_svc
1874#define ca32_client u.u32_client
1875#define ca32_export u.u32_export
1876#define ca32_getfd u.u32_getfd
1877#define ca32_getfs u.u32_getfs
1878};
1879
1880union compat_nfsctl_res {
1881 __u8 cr32_getfh[NFS_FHSIZE];
1882 struct knfsd_fh cr32_getfs;
1883};
1884
d64b1c87
LFS		 1885static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1886 struct compat_nfsctl_arg __user *arg)
1da177e4 1887{
d64b1c87
LFS		 1888 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1889 get_user(karg->ca_version, &arg->ca32_version) ||
1890 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1891 __get_user(karg->ca_svc.svc_nthreads,
1892 &arg->ca32_svc.svc32_nthreads))
1893 return -EFAULT;
1894 return 0;
1da177e4
LT		 1895}
1896
d64b1c87
LFS		 1897static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1898 struct compat_nfsctl_arg __user *arg)
1da177e4 1899{
d64b1c87
LFS		 1900 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1901 sizeof(arg->ca32_client)) ||
1902 get_user(karg->ca_version, &arg->ca32_version) ||
1903 __copy_from_user(&karg->ca_client.cl_ident[0],
1904 &arg->ca32_client.cl32_ident[0],
1905 NFSCLNT_IDMAX) ||
1906 __get_user(karg->ca_client.cl_naddr,
1907 &arg->ca32_client.cl32_naddr) ||
1908 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1909 &arg->ca32_client.cl32_addrlist[0],
1910 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1911 __get_user(karg->ca_client.cl_fhkeytype,
1912 &arg->ca32_client.cl32_fhkeytype) ||
1913 __get_user(karg->ca_client.cl_fhkeylen,
1914 &arg->ca32_client.cl32_fhkeylen) ||
1915 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1916 &arg->ca32_client.cl32_fhkey[0],
1917 NFSCLNT_KEYMAX))
1918 return -EFAULT;
1da177e4 1919
d64b1c87 1920 return 0;
1da177e4
LT		 1921}
1922
d64b1c87
LFS		 1923static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1924 struct compat_nfsctl_arg __user *arg)
1da177e4 1925{
d64b1c87
LFS		 1926 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1927 sizeof(arg->ca32_export)) ||
1928 get_user(karg->ca_version, &arg->ca32_version) ||
1929 __copy_from_user(&karg->ca_export.ex_client[0],
1930 &arg->ca32_export.ex32_client[0],
1931 NFSCLNT_IDMAX) ||
1932 __copy_from_user(&karg->ca_export.ex_path[0],
1933 &arg->ca32_export.ex32_path[0],
1934 NFS_MAXPATHLEN) ||
1935 __get_user(karg->ca_export.ex_dev,
1936 &arg->ca32_export.ex32_dev) ||
1937 __get_user(karg->ca_export.ex_ino,
1938 &arg->ca32_export.ex32_ino) ||
1939 __get_user(karg->ca_export.ex_flags,
1940 &arg->ca32_export.ex32_flags) ||
1941 __get_user(karg->ca_export.ex_anon_uid,
1942 &arg->ca32_export.ex32_anon_uid) ||
1943 __get_user(karg->ca_export.ex_anon_gid,
1944 &arg->ca32_export.ex32_anon_gid))
1945 return -EFAULT;
1da177e4
LT		 1946 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1947 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1948
d64b1c87 1949 return 0;
1da177e4
LT		 1950}
1951
d64b1c87
LFS		 1952static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1953 struct compat_nfsctl_arg __user *arg)
1da177e4 1954{
d64b1c87
LFS		 1955 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1956 sizeof(arg->ca32_getfd)) ||
1957 get_user(karg->ca_version, &arg->ca32_version) ||
1958 __copy_from_user(&karg->ca_getfd.gd_addr,
1959 &arg->ca32_getfd.gd32_addr,
1960 (sizeof(struct sockaddr))) ||
1961 __copy_from_user(&karg->ca_getfd.gd_path,
1962 &arg->ca32_getfd.gd32_path,
1963 (NFS_MAXPATHLEN+1)) ||
1964 __get_user(karg->ca_getfd.gd_version,
1965 &arg->ca32_getfd.gd32_version))
1966 return -EFAULT;
1da177e4 1967
d64b1c87 1968 return 0;
1da177e4
LT		 1969}
1970
d64b1c87
LFS		 1971static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1972 struct compat_nfsctl_arg __user *arg)
1da177e4 1973{
d64b1c87
LFS		 1974 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1975 get_user(karg->ca_version, &arg->ca32_version) ||
1976 __copy_from_user(&karg->ca_getfs.gd_addr,
1977 &arg->ca32_getfs.gd32_addr,
1978 (sizeof(struct sockaddr))) ||
1979 __copy_from_user(&karg->ca_getfs.gd_path,
1980 &arg->ca32_getfs.gd32_path,
1981 (NFS_MAXPATHLEN+1)) ||
1982 __get_user(karg->ca_getfs.gd_maxlen,
1983 &arg->ca32_getfs.gd32_maxlen))
1984 return -EFAULT;
1da177e4 1985
d64b1c87 1986 return 0;
1da177e4
LT		 1987}
1988
1989/* This really doesn't need translations, we are only passing
1990 * back a union which contains opaque nfs file handle data.
1991 */
d64b1c87
LFS		 1992static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
1993 union compat_nfsctl_res __user *res)
1da177e4
LT		 1994{
1995 int err;
1996
1997 err = copy_to_user(res, kres, sizeof(*res));
1998
1999 return (err) ? -EFAULT : 0;
2000}
2001
d64b1c87
LFS		 2002asmlinkage long compat_sys_nfsservctl(int cmd,
2003 struct compat_nfsctl_arg __user *arg,
2004 union compat_nfsctl_res __user *res)
1da177e4
LT		 2005{
2006 struct nfsctl_arg *karg;
2007 union nfsctl_res *kres;
2008 mm_segment_t oldfs;
2009 int err;
2010
2011 karg = kmalloc(sizeof(*karg), GFP_USER);
2012 kres = kmalloc(sizeof(*kres), GFP_USER);
2013 if(!karg || !kres) {
2014 err = -ENOMEM;
2015 goto done;
2016 }
2017
2018 switch(cmd) {
2019 case NFSCTL_SVC:
2020 err = compat_nfs_svc_trans(karg, arg);
2021 break;
2022
2023 case NFSCTL_ADDCLIENT:
2024 err = compat_nfs_clnt_trans(karg, arg);
2025 break;
2026
2027 case NFSCTL_DELCLIENT:
2028 err = compat_nfs_clnt_trans(karg, arg);
2029 break;
2030
2031 case NFSCTL_EXPORT:
2032 case NFSCTL_UNEXPORT:
2033 err = compat_nfs_exp_trans(karg, arg);
2034 break;
2035
2036 case NFSCTL_GETFD:
2037 err = compat_nfs_getfd_trans(karg, arg);
2038 break;
2039
2040 case NFSCTL_GETFS:
2041 err = compat_nfs_getfs_trans(karg, arg);
2042 break;
2043
2044 default:
2045 err = -EINVAL;
57070d01 2046 break;
1da177e4
LT		 2047 }
2048
57070d01
PS		 2049 if (err)
2050 goto done;
2051
1da177e4
LT		 2052 oldfs = get_fs();
2053 set_fs(KERNEL_DS);
2054 /* The __user pointer casts are valid because of the set_fs() */
2055 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2056 set_fs(oldfs);
2057
2058 if (err)
2059 goto done;
2060
2061 if((cmd == NFSCTL_GETFD) ||
2062 (cmd == NFSCTL_GETFS))
2063 err = compat_nfs_getfh_res_trans(kres, res);
2064
2065done:
2066 kfree(karg);
2067 kfree(kres);
2068 return err;
2069}
2070#else /* !NFSD */
2071long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2072{
2073 return sys_ni_syscall();
2074}
2075#endif
f6dfb4fd
DL		 2076
2077#ifdef CONFIG_EPOLL
2078
2079#ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
2080asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd,
2081 struct compat_epoll_event __user *event)
2082{
2083 long err = 0;
2084 struct compat_epoll_event user;
2085 struct epoll_event __user *kernel = NULL;
2086
2087 if (event) {
2088 if (copy_from_user(&user, event, sizeof(user)))
2089 return -EFAULT;
2090 kernel = compat_alloc_user_space(sizeof(struct epoll_event));
2091 err |= __put_user(user.events, &kernel->events);
2092 err |= __put_user(user.data, &kernel->data);
2093 }
2094
2095 return err ? err : sys_epoll_ctl(epfd, op, fd, kernel);
2096}
2097
2098
2099asmlinkage long compat_sys_epoll_wait(int epfd,
2100 struct compat_epoll_event __user *events,
2101 int maxevents, int timeout)
2102{
2103 long i, ret, err = 0;
2104 struct epoll_event __user *kbuf;
2105 struct epoll_event ev;
2106
2107 if ((maxevents <= 0) ||
2108 (maxevents > (INT_MAX / sizeof(struct epoll_event))))
2109 return -EINVAL;
2110 kbuf = compat_alloc_user_space(sizeof(struct epoll_event) * maxevents);
2111 ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
2112 for (i = 0; i < ret; i++) {
2113 err |= __get_user(ev.events, &kbuf[i].events);
2114 err |= __get_user(ev.data, &kbuf[i].data);
2115 err |= __put_user(ev.events, &events->events);
2116 err |= __put_user_unaligned(ev.data, &events->data);
2117 events++;
2118 }
2119
2120 return err ? -EFAULT: ret;
2121}
2122#endif /* CONFIG_HAS_COMPAT_EPOLL_EVENT */
2123
2124#ifdef TIF_RESTORE_SIGMASK
2125asmlinkage long compat_sys_epoll_pwait(int epfd,
2126 struct compat_epoll_event __user *events,
2127 int maxevents, int timeout,
2128 const compat_sigset_t __user *sigmask,
2129 compat_size_t sigsetsize)
2130{
2131 long err;
2132 compat_sigset_t csigmask;
2133 sigset_t ksigmask, sigsaved;
2134
2135 /*
2136 * If the caller wants a certain signal mask to be set during the wait,
2137 * we apply it here.
2138 */
2139 if (sigmask) {
2140 if (sigsetsize != sizeof(compat_sigset_t))
2141 return -EINVAL;
2142 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2143 return -EFAULT;
2144 sigset_from_compat(&ksigmask, &csigmask);
2145 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2146 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2147 }
2148
2149#ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
2150 err = compat_sys_epoll_wait(epfd, events, maxevents, timeout);
2151#else
2152 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2153#endif
2154
2155 /*
2156 * If we changed the signal mask, we need to restore the original one.
2157 * In case we've got a signal while waiting, we do not restore the
2158 * signal mask yet, and we allow do_signal() to deliver the signal on
2159 * the way back to userspace, before the signal mask is restored.
2160 */
2161 if (sigmask) {
2162 if (err == -EINTR) {
2163 memcpy(&current->saved_sigmask, &sigsaved,
2164 sizeof(sigsaved));
2165 set_thread_flag(TIF_RESTORE_SIGMASK);
2166 } else
2167 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2168 }
2169
2170 return err;
2171}
2172#endif /* TIF_RESTORE_SIGMASK */
2173
2174#endif /* CONFIG_EPOLL */
Clone of davem's net-next-2.6 tree