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[net-next-2.6.git] / fs / compat.c
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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
18#include <linux/linkage.h>
19#include <linux/compat.h>
20#include <linux/errno.h>
21#include <linux/time.h>
22#include <linux/fs.h>
23#include <linux/fcntl.h>
24#include <linux/namei.h>
25#include <linux/file.h>
26#include <linux/vfs.h>
27#include <linux/ioctl32.h>
28#include <linux/ioctl.h>
29#include <linux/init.h>
30#include <linux/sockios.h> /* for SIOCDEVPRIVATE */
31#include <linux/smb.h>
32#include <linux/smb_mount.h>
33#include <linux/ncp_mount.h>
9a9947bf 34#include <linux/nfs4_mount.h>
1da177e4
LT		 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>
0eeca283 40#include <linux/fsnotify.h>
1da177e4
LT		 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>
8f0ab514 47#include <linux/tsacct_kern.h>
4a805e86 48#include <linux/mm.h>
1da177e4
LT		 49
50#include <net/sock.h> /* siocdevprivate_ioctl */
51
52#include <asm/uaccess.h>
53#include <asm/mmu_context.h>
54#include <asm/ioctls.h>
07f3f05c 55#include "internal.h"
9f72949f 56
bebfa101
AK		 57int compat_log = 1;
58
59int compat_printk(const char *fmt, ...)
60{
61 va_list ap;
62 int ret;
63 if (!compat_log)
64 return 0;
65 va_start(ap, fmt);
66 ret = vprintk(fmt, ap);
67 va_end(ap);
68 return ret;
69}
70
ee0b3e67
BP		 71#include "read_write.h"
72
1da177e4
LT		 73/*
74 * Not all architectures have sys_utime, so implement this in terms
75 * of sys_utimes.
76 */
77asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
78{
79 struct timeval tv[2];
80
81 if (t) {
82 if (get_user(tv[0].tv_sec, &t->actime) ||
83 get_user(tv[1].tv_sec, &t->modtime))
84 return -EFAULT;
85 tv[0].tv_usec = 0;
86 tv[1].tv_usec = 0;
87 }
5590ff0d 88 return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
1da177e4
LT		 89}
90
9ad11ab4 91asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4
LT		 92{
93 struct timeval tv[2];
94
9ad11ab4 95 if (t) {
1da177e4
LT		 96 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
97 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
98 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
99 get_user(tv[1].tv_usec, &t[1].tv_usec))
9ad11ab4
SR		 100 return -EFAULT;
101 }
5590ff0d
UD		 102 return do_utimes(dfd, filename, t ? tv : NULL);
103}
104
105asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
106{
107 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 108}
109
110asmlinkage long compat_sys_newstat(char __user * filename,
111 struct compat_stat __user *statbuf)
112{
113 struct kstat stat;
5590ff0d 114 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 115
116 if (!error)
117 error = cp_compat_stat(&stat, statbuf);
118 return error;
119}
120
121asmlinkage long compat_sys_newlstat(char __user * filename,
122 struct compat_stat __user *statbuf)
123{
124 struct kstat stat;
5590ff0d 125 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 126
127 if (!error)
128 error = cp_compat_stat(&stat, statbuf);
129 return error;
130}
131
82d821dd 132#ifndef __ARCH_WANT_STAT64
9ad11ab4 133asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
5590ff0d
UD		 134 struct compat_stat __user *statbuf, int flag)
135{
136 struct kstat stat;
137 int error = -EINVAL;
138
139 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
140 goto out;
141
142 if (flag & AT_SYMLINK_NOFOLLOW)
143 error = vfs_lstat_fd(dfd, filename, &stat);
144 else
145 error = vfs_stat_fd(dfd, filename, &stat);
146
147 if (!error)
148 error = cp_compat_stat(&stat, statbuf);
149
150out:
151 return error;
152}
82d821dd 153#endif
5590ff0d 154
1da177e4
LT		 155asmlinkage long compat_sys_newfstat(unsigned int fd,
156 struct compat_stat __user * statbuf)
157{
158 struct kstat stat;
159 int error = vfs_fstat(fd, &stat);
160
161 if (!error)
162 error = cp_compat_stat(&stat, statbuf);
163 return error;
164}
165
166static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
167{
168
169 if (sizeof ubuf->f_blocks == 4) {
170 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
171 0xffffffff00000000ULL)
172 return -EOVERFLOW;
173 /* f_files and f_ffree may be -1; it's okay
174 * to stuff that into 32 bits */
175 if (kbuf->f_files != 0xffffffffffffffffULL
176 && (kbuf->f_files & 0xffffffff00000000ULL))
177 return -EOVERFLOW;
178 if (kbuf->f_ffree != 0xffffffffffffffffULL
179 && (kbuf->f_ffree & 0xffffffff00000000ULL))
180 return -EOVERFLOW;
181 }
182 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
183 __put_user(kbuf->f_type, &ubuf->f_type) ||
184 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
185 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
186 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
187 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
188 __put_user(kbuf->f_files, &ubuf->f_files) ||
189 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
190 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
191 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
192 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
193 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
194 __put_user(0, &ubuf->f_spare[0]) ||
195 __put_user(0, &ubuf->f_spare[1]) ||
196 __put_user(0, &ubuf->f_spare[2]) ||
197 __put_user(0, &ubuf->f_spare[3]) ||
198 __put_user(0, &ubuf->f_spare[4]))
199 return -EFAULT;
200 return 0;
201}
202
203/*
204 * The following statfs calls are copies of code from fs/open.c and
205 * should be checked against those from time to time
206 */
207asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
208{
209 struct nameidata nd;
210 int error;
211
212 error = user_path_walk(path, &nd);
213 if (!error) {
214 struct kstatfs tmp;
726c3342 215 error = vfs_statfs(nd.dentry, &tmp);
86e07ce7
DG		 216 if (!error)
217 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 218 path_release(&nd);
219 }
220 return error;
221}
222
223asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
224{
225 struct file * file;
226 struct kstatfs tmp;
227 int error;
228
229 error = -EBADF;
230 file = fget(fd);
231 if (!file)
232 goto out;
726c3342 233 error = vfs_statfs(file->f_dentry, &tmp);
86e07ce7
DG		 234 if (!error)
235 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 236 fput(file);
237out:
238 return error;
239}
240
241static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
242{
243 if (sizeof ubuf->f_blocks == 4) {
244 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
245 0xffffffff00000000ULL)
246 return -EOVERFLOW;
247 /* f_files and f_ffree may be -1; it's okay
248 * to stuff that into 32 bits */
249 if (kbuf->f_files != 0xffffffffffffffffULL
250 && (kbuf->f_files & 0xffffffff00000000ULL))
251 return -EOVERFLOW;
252 if (kbuf->f_ffree != 0xffffffffffffffffULL
253 && (kbuf->f_ffree & 0xffffffff00000000ULL))
254 return -EOVERFLOW;
255 }
256 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
257 __put_user(kbuf->f_type, &ubuf->f_type) ||
258 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
259 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
260 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
261 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
262 __put_user(kbuf->f_files, &ubuf->f_files) ||
263 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
264 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
265 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
266 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
267 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
268 return -EFAULT;
269 return 0;
270}
271
272asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
273{
274 struct nameidata nd;
275 int error;
276
277 if (sz != sizeof(*buf))
278 return -EINVAL;
279
280 error = user_path_walk(path, &nd);
281 if (!error) {
282 struct kstatfs tmp;
726c3342 283 error = vfs_statfs(nd.dentry, &tmp);
86e07ce7
DG		 284 if (!error)
285 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 286 path_release(&nd);
287 }
288 return error;
289}
290
291asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
292{
293 struct file * file;
294 struct kstatfs tmp;
295 int error;
296
297 if (sz != sizeof(*buf))
298 return -EINVAL;
299
300 error = -EBADF;
301 file = fget(fd);
302 if (!file)
303 goto out;
726c3342 304 error = vfs_statfs(file->f_dentry, &tmp);
86e07ce7
DG		 305 if (!error)
306 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 307 fput(file);
308out:
309 return error;
310}
311
312/* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
313
314#define IOCTL_HASHSIZE 256
315static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
1da177e4 316
1da177e4
LT		 317static inline unsigned long ioctl32_hash(unsigned long cmd)
318{
319 return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
320}
321
322static void ioctl32_insert_translation(struct ioctl_trans *trans)
323{
324 unsigned long hash;
325 struct ioctl_trans *t;
326
327 hash = ioctl32_hash (trans->cmd);
328 if (!ioctl32_hash_table[hash])
329 ioctl32_hash_table[hash] = trans;
330 else {
331 t = ioctl32_hash_table[hash];
332 while (t->next)
333 t = t->next;
334 trans->next = NULL;
335 t->next = trans;
336 }
337}
338
339static int __init init_sys32_ioctl(void)
340{
341 int i;
342
343 for (i = 0; i < ioctl_table_size; i++) {
344 if (ioctl_start[i].next != 0) {
345 printk("ioctl translation %d bad\n",i);
346 return -1;
347 }
348
349 ioctl32_insert_translation(&ioctl_start[i]);
350 }
351 return 0;
352}
353
354__initcall(init_sys32_ioctl);
355
1da177e4
LT		 356static void compat_ioctl_error(struct file *filp, unsigned int fd,
357 unsigned int cmd, unsigned long arg)
358{
359 char buf[10];
360 char *fn = "?";
361 char *path;
362
363 /* find the name of the device. */
364 path = (char *)__get_free_page(GFP_KERNEL);
365 if (path) {
366 fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE);
367 if (IS_ERR(fn))
368 fn = "?";
369 }
370
371 sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
372 if (!isprint(buf[1]))
373 sprintf(buf, "%02x", buf[1]);
bebfa101 374 compat_printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
1da177e4
LT		 375 "cmd(%08x){%s} arg(%08x) on %s\n",
376 current->comm, current->pid,
377 (int)fd, (unsigned int)cmd, buf,
378 (unsigned int)arg, fn);
379
380 if (path)
381 free_page((unsigned long)path);
382}
383
384asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
385 unsigned long arg)
386{
387 struct file *filp;
388 int error = -EBADF;
389 struct ioctl_trans *t;
390 int fput_needed;
391
392 filp = fget_light(fd, &fput_needed);
393 if (!filp)
394 goto out;
395
396 /* RED-PEN how should LSM module know it's handling 32bit? */
397 error = security_file_ioctl(filp, cmd, arg);
398 if (error)
399 goto out_fput;
400
401 /*
402 * To allow the compat_ioctl handlers to be self contained
403 * we need to check the common ioctls here first.
404 * Just handle them with the standard handlers below.
405 */
406 switch (cmd) {
407 case FIOCLEX:
408 case FIONCLEX:
409 case FIONBIO:
410 case FIOASYNC:
411 case FIOQSIZE:
412 break;
413
414 case FIBMAP:
415 case FIGETBSZ:
416 case FIONREAD:
417 if (S_ISREG(filp->f_dentry->d_inode->i_mode))
418 break;
419 /*FALL THROUGH*/
420
421 default:
422 if (filp->f_op && filp->f_op->compat_ioctl) {
423 error = filp->f_op->compat_ioctl(filp, cmd, arg);
424 if (error != -ENOIOCTLCMD)
425 goto out_fput;
426 }
427
428 if (!filp->f_op ||
429 (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
430 goto do_ioctl;
431 break;
432 }
433
1da177e4
LT		 434 for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
435 if (t->cmd == cmd)
436 goto found_handler;
437 }
1da177e4
LT		 438
439 if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) &&
440 cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
441 error = siocdevprivate_ioctl(fd, cmd, arg);
442 } else {
443 static int count;
444
445 if (++count <= 50)
446 compat_ioctl_error(filp, fd, cmd, arg);
447 error = -EINVAL;
448 }
449
450 goto out_fput;
451
452 found_handler:
453 if (t->handler) {
454 lock_kernel();
455 error = t->handler(fd, cmd, arg, filp);
456 unlock_kernel();
1da177e4
LT		 457 goto out_fput;
458 }
459
1da177e4
LT		 460 do_ioctl:
461 error = vfs_ioctl(filp, fd, cmd, arg);
462 out_fput:
463 fput_light(filp, fput_needed);
464 out:
465 return error;
466}
467
468static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
469{
470 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
471 __get_user(kfl->l_type, &ufl->l_type) ||
472 __get_user(kfl->l_whence, &ufl->l_whence) ||
473 __get_user(kfl->l_start, &ufl->l_start) ||
474 __get_user(kfl->l_len, &ufl->l_len) ||
475 __get_user(kfl->l_pid, &ufl->l_pid))
476 return -EFAULT;
477 return 0;
478}
479
480static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
481{
482 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
483 __put_user(kfl->l_type, &ufl->l_type) ||
484 __put_user(kfl->l_whence, &ufl->l_whence) ||
485 __put_user(kfl->l_start, &ufl->l_start) ||
486 __put_user(kfl->l_len, &ufl->l_len) ||
487 __put_user(kfl->l_pid, &ufl->l_pid))
488 return -EFAULT;
489 return 0;
490}
491
492#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
493static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
494{
495 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
496 __get_user(kfl->l_type, &ufl->l_type) ||
497 __get_user(kfl->l_whence, &ufl->l_whence) ||
498 __get_user(kfl->l_start, &ufl->l_start) ||
499 __get_user(kfl->l_len, &ufl->l_len) ||
500 __get_user(kfl->l_pid, &ufl->l_pid))
501 return -EFAULT;
502 return 0;
503}
504#endif
505
506#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
507static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
508{
509 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
510 __put_user(kfl->l_type, &ufl->l_type) ||
511 __put_user(kfl->l_whence, &ufl->l_whence) ||
512 __put_user(kfl->l_start, &ufl->l_start) ||
513 __put_user(kfl->l_len, &ufl->l_len) ||
514 __put_user(kfl->l_pid, &ufl->l_pid))
515 return -EFAULT;
516 return 0;
517}
518#endif
519
520asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
521 unsigned long arg)
522{
523 mm_segment_t old_fs;
524 struct flock f;
525 long ret;
526
527 switch (cmd) {
528 case F_GETLK:
529 case F_SETLK:
530 case F_SETLKW:
531 ret = get_compat_flock(&f, compat_ptr(arg));
532 if (ret != 0)
533 break;
534 old_fs = get_fs();
535 set_fs(KERNEL_DS);
536 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
537 set_fs(old_fs);
538 if (cmd == F_GETLK && ret == 0) {
2520f14c
N		 539 /* GETLK was successfule and we need to return the data...
540 * but it needs to fit in the compat structure.
541 * l_start shouldn't be too big, unless the original
542 * start + end is greater than COMPAT_OFF_T_MAX, in which
543 * case the app was asking for trouble, so we return
544 * -EOVERFLOW in that case.
545 * l_len could be too big, in which case we just truncate it,
546 * and only allow the app to see that part of the conflicting
547 * lock that might make sense to it anyway
548 */
549
550 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 551 ret = -EOVERFLOW;
2520f14c
N		 552 if (f.l_len > COMPAT_OFF_T_MAX)
553 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 554 if (ret == 0)
555 ret = put_compat_flock(&f, compat_ptr(arg));
556 }
557 break;
558
559 case F_GETLK64:
560 case F_SETLK64:
561 case F_SETLKW64:
562 ret = get_compat_flock64(&f, compat_ptr(arg));
563 if (ret != 0)
564 break;
565 old_fs = get_fs();
566 set_fs(KERNEL_DS);
567 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
568 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
569 (unsigned long)&f);
570 set_fs(old_fs);
571 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 572 /* need to return lock information - see above for commentary */
573 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 574 ret = -EOVERFLOW;
2520f14c
N		 575 if (f.l_len > COMPAT_LOFF_T_MAX)
576 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 577 if (ret == 0)
578 ret = put_compat_flock64(&f, compat_ptr(arg));
579 }
580 break;
581
582 default:
583 ret = sys_fcntl(fd, cmd, arg);
584 break;
585 }
586 return ret;
587}
588
589asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
590 unsigned long arg)
591{
592 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
593 return -EINVAL;
594 return compat_sys_fcntl64(fd, cmd, arg);
595}
596
597asmlinkage long
598compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
599{
600 long ret;
601 aio_context_t ctx64;
602
603 mm_segment_t oldfs = get_fs();
604 if (unlikely(get_user(ctx64, ctx32p)))
605 return -EFAULT;
606
607 set_fs(KERNEL_DS);
608 /* The __user pointer cast is valid because of the set_fs() */
609 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
610 set_fs(oldfs);
611 /* truncating is ok because it's a user address */
612 if (!ret)
613 ret = put_user((u32) ctx64, ctx32p);
614 return ret;
615}
616
617asmlinkage long
618compat_sys_io_getevents(aio_context_t ctx_id,
619 unsigned long min_nr,
620 unsigned long nr,
621 struct io_event __user *events,
622 struct compat_timespec __user *timeout)
623{
624 long ret;
625 struct timespec t;
626 struct timespec __user *ut = NULL;
627
628 ret = -EFAULT;
629 if (unlikely(!access_ok(VERIFY_WRITE, events,
630 nr * sizeof(struct io_event))))
631 goto out;
632 if (timeout) {
633 if (get_compat_timespec(&t, timeout))
634 goto out;
635
636 ut = compat_alloc_user_space(sizeof(*ut));
637 if (copy_to_user(ut, &t, sizeof(t)) )
638 goto out;
639 }
640 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
641out:
642 return ret;
643}
644
645static inline long
646copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
647{
648 compat_uptr_t uptr;
649 int i;
650
651 for (i = 0; i < nr; ++i) {
652 if (get_user(uptr, ptr32 + i))
653 return -EFAULT;
654 if (put_user(compat_ptr(uptr), ptr64 + i))
655 return -EFAULT;
656 }
657 return 0;
658}
659
660#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
661
662asmlinkage long
663compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
664{
665 struct iocb __user * __user *iocb64;
666 long ret;
667
668 if (unlikely(nr < 0))
669 return -EINVAL;
670
671 if (nr > MAX_AIO_SUBMITS)
672 nr = MAX_AIO_SUBMITS;
673
674 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
675 ret = copy_iocb(nr, iocb, iocb64);
676 if (!ret)
677 ret = sys_io_submit(ctx_id, nr, iocb64);
678 return ret;
679}
680
681struct compat_ncp_mount_data {
682 compat_int_t version;
683 compat_uint_t ncp_fd;
202e5979 684 __compat_uid_t mounted_uid;
1da177e4
LT		 685 compat_pid_t wdog_pid;
686 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
687 compat_uint_t time_out;
688 compat_uint_t retry_count;
689 compat_uint_t flags;
202e5979
SR		 690 __compat_uid_t uid;
691 __compat_gid_t gid;
1da177e4
LT		 692 compat_mode_t file_mode;
693 compat_mode_t dir_mode;
694};
695
696struct compat_ncp_mount_data_v4 {
697 compat_int_t version;
698 compat_ulong_t flags;
699 compat_ulong_t mounted_uid;
700 compat_long_t wdog_pid;
701 compat_uint_t ncp_fd;
702 compat_uint_t time_out;
703 compat_uint_t retry_count;
704 compat_ulong_t uid;
705 compat_ulong_t gid;
706 compat_ulong_t file_mode;
707 compat_ulong_t dir_mode;
708};
709
710static void *do_ncp_super_data_conv(void *raw_data)
711{
712 int version = *(unsigned int *)raw_data;
713
714 if (version == 3) {
715 struct compat_ncp_mount_data *c_n = raw_data;
716 struct ncp_mount_data *n = raw_data;
717
718 n->dir_mode = c_n->dir_mode;
719 n->file_mode = c_n->file_mode;
720 n->gid = c_n->gid;
721 n->uid = c_n->uid;
722 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
723 n->wdog_pid = c_n->wdog_pid;
724 n->mounted_uid = c_n->mounted_uid;
725 } else if (version == 4) {
726 struct compat_ncp_mount_data_v4 *c_n = raw_data;
727 struct ncp_mount_data_v4 *n = raw_data;
728
729 n->dir_mode = c_n->dir_mode;
730 n->file_mode = c_n->file_mode;
731 n->gid = c_n->gid;
732 n->uid = c_n->uid;
733 n->retry_count = c_n->retry_count;
734 n->time_out = c_n->time_out;
735 n->ncp_fd = c_n->ncp_fd;
736 n->wdog_pid = c_n->wdog_pid;
737 n->mounted_uid = c_n->mounted_uid;
738 n->flags = c_n->flags;
739 } else if (version != 5) {
740 return NULL;
741 }
742
743 return raw_data;
744}
745
746struct compat_smb_mount_data {
747 compat_int_t version;
202e5979
SR		 748 __compat_uid_t mounted_uid;
749 __compat_uid_t uid;
750 __compat_gid_t gid;
1da177e4
LT		 751 compat_mode_t file_mode;
752 compat_mode_t dir_mode;
753};
754
755static void *do_smb_super_data_conv(void *raw_data)
756{
757 struct smb_mount_data *s = raw_data;
758 struct compat_smb_mount_data *c_s = raw_data;
759
760 if (c_s->version != SMB_MOUNT_OLDVERSION)
761 goto out;
762 s->dir_mode = c_s->dir_mode;
763 s->file_mode = c_s->file_mode;
764 s->gid = c_s->gid;
765 s->uid = c_s->uid;
766 s->mounted_uid = c_s->mounted_uid;
767 out:
768 return raw_data;
769}
770
9a9947bf
DH		 771struct compat_nfs_string {
772 compat_uint_t len;
5fc3e624 773 compat_uptr_t data;
9a9947bf
DH		 774};
775
776static inline void compat_nfs_string(struct nfs_string *dst,
777 struct compat_nfs_string *src)
778{
779 dst->data = compat_ptr(src->data);
780 dst->len = src->len;
781}
782
783struct compat_nfs4_mount_data_v1 {
784 compat_int_t version;
785 compat_int_t flags;
786 compat_int_t rsize;
787 compat_int_t wsize;
788 compat_int_t timeo;
789 compat_int_t retrans;
790 compat_int_t acregmin;
791 compat_int_t acregmax;
792 compat_int_t acdirmin;
793 compat_int_t acdirmax;
794 struct compat_nfs_string client_addr;
795 struct compat_nfs_string mnt_path;
796 struct compat_nfs_string hostname;
797 compat_uint_t host_addrlen;
5fc3e624 798 compat_uptr_t host_addr;
9a9947bf
DH		 799 compat_int_t proto;
800 compat_int_t auth_flavourlen;
5fc3e624 801 compat_uptr_t auth_flavours;
9a9947bf
DH		 802};
803
804static int do_nfs4_super_data_conv(void *raw_data)
805{
806 int version = *(compat_uint_t *) raw_data;
807
808 if (version == 1) {
809 struct compat_nfs4_mount_data_v1 *raw = raw_data;
810 struct nfs4_mount_data *real = raw_data;
811
812 /* copy the fields backwards */
813 real->auth_flavours = compat_ptr(raw->auth_flavours);
814 real->auth_flavourlen = raw->auth_flavourlen;
815 real->proto = raw->proto;
816 real->host_addr = compat_ptr(raw->host_addr);
817 real->host_addrlen = raw->host_addrlen;
818 compat_nfs_string(&real->hostname, &raw->hostname);
819 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
820 compat_nfs_string(&real->client_addr, &raw->client_addr);
821 real->acdirmax = raw->acdirmax;
822 real->acdirmin = raw->acdirmin;
823 real->acregmax = raw->acregmax;
824 real->acregmin = raw->acregmin;
825 real->retrans = raw->retrans;
826 real->timeo = raw->timeo;
827 real->wsize = raw->wsize;
828 real->rsize = raw->rsize;
829 real->flags = raw->flags;
830 real->version = raw->version;
831 }
832 else {
833 return -EINVAL;
834 }
835
836 return 0;
837}
838
1da177e4
LT		 839#define SMBFS_NAME "smbfs"
840#define NCPFS_NAME "ncpfs"
9a9947bf 841#define NFS4_NAME "nfs4"
1da177e4
LT		 842
843asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
844 char __user * type, unsigned long flags,
845 void __user * data)
846{
847 unsigned long type_page;
848 unsigned long data_page;
849 unsigned long dev_page;
850 char *dir_page;
851 int retval;
852
853 retval = copy_mount_options (type, &type_page);
854 if (retval < 0)
855 goto out;
856
857 dir_page = getname(dir_name);
858 retval = PTR_ERR(dir_page);
859 if (IS_ERR(dir_page))
860 goto out1;
861
862 retval = copy_mount_options (dev_name, &dev_page);
863 if (retval < 0)
864 goto out2;
865
866 retval = copy_mount_options (data, &data_page);
867 if (retval < 0)
868 goto out3;
869
870 retval = -EINVAL;
871
872 if (type_page) {
873 if (!strcmp((char *)type_page, SMBFS_NAME)) {
874 do_smb_super_data_conv((void *)data_page);
875 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
876 do_ncp_super_data_conv((void *)data_page);
9a9947bf
DH		 877 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
878 if (do_nfs4_super_data_conv((void *) data_page))
879 goto out4;
1da177e4
LT		 880 }
881 }
882
883 lock_kernel();
884 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
885 flags, (void*)data_page);
886 unlock_kernel();
887
9a9947bf 888 out4:
1da177e4
LT		 889 free_page(data_page);
890 out3:
891 free_page(dev_page);
892 out2:
893 putname(dir_page);
894 out1:
895 free_page(type_page);
896 out:
897 return retval;
898}
899
900#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
901#define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
902 ~(sizeof(compat_long_t)-1))
903
904struct compat_old_linux_dirent {
905 compat_ulong_t d_ino;
906 compat_ulong_t d_offset;
907 unsigned short d_namlen;
908 char d_name[1];
909};
910
911struct compat_readdir_callback {
912 struct compat_old_linux_dirent __user *dirent;
913 int result;
914};
915
916static int compat_fillonedir(void *__buf, const char *name, int namlen,
917 loff_t offset, ino_t ino, unsigned int d_type)
918{
919 struct compat_readdir_callback *buf = __buf;
920 struct compat_old_linux_dirent __user *dirent;
921
922 if (buf->result)
923 return -EINVAL;
924 buf->result++;
925 dirent = buf->dirent;
926 if (!access_ok(VERIFY_WRITE, dirent,
927 (unsigned long)(dirent->d_name + namlen + 1) -
928 (unsigned long)dirent))
929 goto efault;
930 if ( __put_user(ino, &dirent->d_ino) ||
931 __put_user(offset, &dirent->d_offset) ||
932 __put_user(namlen, &dirent->d_namlen) ||
933 __copy_to_user(dirent->d_name, name, namlen) ||
934 __put_user(0, dirent->d_name + namlen))
935 goto efault;
936 return 0;
937efault:
938 buf->result = -EFAULT;
939 return -EFAULT;
940}
941
942asmlinkage long compat_sys_old_readdir(unsigned int fd,
943 struct compat_old_linux_dirent __user *dirent, unsigned int count)
944{
945 int error;
946 struct file *file;
947 struct compat_readdir_callback buf;
948
949 error = -EBADF;
950 file = fget(fd);
951 if (!file)
952 goto out;
953
954 buf.result = 0;
955 buf.dirent = dirent;
956
957 error = vfs_readdir(file, compat_fillonedir, &buf);
958 if (error >= 0)
959 error = buf.result;
960
961 fput(file);
962out:
963 return error;
964}
965
966struct compat_linux_dirent {
967 compat_ulong_t d_ino;
968 compat_ulong_t d_off;
969 unsigned short d_reclen;
970 char d_name[1];
971};
972
973struct compat_getdents_callback {
974 struct compat_linux_dirent __user *current_dir;
975 struct compat_linux_dirent __user *previous;
976 int count;
977 int error;
978};
979
980static int compat_filldir(void *__buf, const char *name, int namlen,
981 loff_t offset, ino_t ino, unsigned int d_type)
982{
983 struct compat_linux_dirent __user * dirent;
984 struct compat_getdents_callback *buf = __buf;
985 int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
986
987 buf->error = -EINVAL; /* only used if we fail.. */
988 if (reclen > buf->count)
989 return -EINVAL;
990 dirent = buf->previous;
991 if (dirent) {
992 if (__put_user(offset, &dirent->d_off))
993 goto efault;
994 }
995 dirent = buf->current_dir;
996 if (__put_user(ino, &dirent->d_ino))
997 goto efault;
998 if (__put_user(reclen, &dirent->d_reclen))
999 goto efault;
1000 if (copy_to_user(dirent->d_name, name, namlen))
1001 goto efault;
1002 if (__put_user(0, dirent->d_name + namlen))
1003 goto efault;
1004 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1005 goto efault;
1006 buf->previous = dirent;
1007 dirent = (void __user *)dirent + reclen;
1008 buf->current_dir = dirent;
1009 buf->count -= reclen;
1010 return 0;
1011efault:
1012 buf->error = -EFAULT;
1013 return -EFAULT;
1014}
1015
1016asmlinkage long compat_sys_getdents(unsigned int fd,
1017 struct compat_linux_dirent __user *dirent, unsigned int count)
1018{
1019 struct file * file;
1020 struct compat_linux_dirent __user * lastdirent;
1021 struct compat_getdents_callback buf;
1022 int error;
1023
1024 error = -EFAULT;
1025 if (!access_ok(VERIFY_WRITE, dirent, count))
1026 goto out;
1027
1028 error = -EBADF;
1029 file = fget(fd);
1030 if (!file)
1031 goto out;
1032
1033 buf.current_dir = dirent;
1034 buf.previous = NULL;
1035 buf.count = count;
1036 buf.error = 0;
1037
1038 error = vfs_readdir(file, compat_filldir, &buf);
1039 if (error < 0)
1040 goto out_putf;
1041 error = buf.error;
1042 lastdirent = buf.previous;
1043 if (lastdirent) {
1044 if (put_user(file->f_pos, &lastdirent->d_off))
1045 error = -EFAULT;
1046 else
1047 error = count - buf.count;
1048 }
1049
1050out_putf:
1051 fput(file);
1052out:
1053 return error;
1054}
1055
1056#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1057#define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
1058
1059struct compat_getdents_callback64 {
1060 struct linux_dirent64 __user *current_dir;
1061 struct linux_dirent64 __user *previous;
1062 int count;
1063 int error;
1064};
1065
1066static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1067 ino_t ino, unsigned int d_type)
1068{
1069 struct linux_dirent64 __user *dirent;
1070 struct compat_getdents_callback64 *buf = __buf;
1071 int jj = NAME_OFFSET(dirent);
1072 int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
1073 u64 off;
1074
1075 buf->error = -EINVAL; /* only used if we fail.. */
1076 if (reclen > buf->count)
1077 return -EINVAL;
1078 dirent = buf->previous;
1079
1080 if (dirent) {
1081 if (__put_user_unaligned(offset, &dirent->d_off))
1082 goto efault;
1083 }
1084 dirent = buf->current_dir;
1085 if (__put_user_unaligned(ino, &dirent->d_ino))
1086 goto efault;
1087 off = 0;
1088 if (__put_user_unaligned(off, &dirent->d_off))
1089 goto efault;
1090 if (__put_user(reclen, &dirent->d_reclen))
1091 goto efault;
1092 if (__put_user(d_type, &dirent->d_type))
1093 goto efault;
1094 if (copy_to_user(dirent->d_name, name, namlen))
1095 goto efault;
1096 if (__put_user(0, dirent->d_name + namlen))
1097 goto efault;
1098 buf->previous = dirent;
1099 dirent = (void __user *)dirent + reclen;
1100 buf->current_dir = dirent;
1101 buf->count -= reclen;
1102 return 0;
1103efault:
1104 buf->error = -EFAULT;
1105 return -EFAULT;
1106}
1107
1108asmlinkage long compat_sys_getdents64(unsigned int fd,
1109 struct linux_dirent64 __user * dirent, unsigned int count)
1110{
1111 struct file * file;
1112 struct linux_dirent64 __user * lastdirent;
1113 struct compat_getdents_callback64 buf;
1114 int error;
1115
1116 error = -EFAULT;
1117 if (!access_ok(VERIFY_WRITE, dirent, count))
1118 goto out;
1119
1120 error = -EBADF;
1121 file = fget(fd);
1122 if (!file)
1123 goto out;
1124
1125 buf.current_dir = dirent;
1126 buf.previous = NULL;
1127 buf.count = count;
1128 buf.error = 0;
1129
1130 error = vfs_readdir(file, compat_filldir64, &buf);
1131 if (error < 0)
1132 goto out_putf;
1133 error = buf.error;
1134 lastdirent = buf.previous;
1135 if (lastdirent) {
1136 typeof(lastdirent->d_off) d_off = file->f_pos;
1137 __put_user_unaligned(d_off, &lastdirent->d_off);
1138 error = count - buf.count;
1139 }
1140
1141out_putf:
1142 fput(file);
1143out:
1144 return error;
1145}
1146#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1147
1148static ssize_t compat_do_readv_writev(int type, struct file *file,
1149 const struct compat_iovec __user *uvector,
1150 unsigned long nr_segs, loff_t *pos)
1151{
1da177e4
LT		 1152 compat_ssize_t tot_len;
1153 struct iovec iovstack[UIO_FASTIOV];
1154 struct iovec *iov=iovstack, *vector;
1155 ssize_t ret;
1156 int seg;
1157 io_fn_t fn;
1158 iov_fn_t fnv;
1159
1160 /*
1161 * SuS says "The readv() function *may* fail if the iovcnt argument
1162 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1163 * traditionally returned zero for zero segments, so...
1164 */
1165 ret = 0;
1166 if (nr_segs == 0)
1167 goto out;
1168
1169 /*
1170 * First get the "struct iovec" from user memory and
1171 * verify all the pointers
1172 */
1173 ret = -EINVAL;
1174 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1175 goto out;
1176 if (!file->f_op)
1177 goto out;
1178 if (nr_segs > UIO_FASTIOV) {
1179 ret = -ENOMEM;
1180 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1181 if (!iov)
1182 goto out;
1183 }
1184 ret = -EFAULT;
1185 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1186 goto out;
1187
1188 /*
1189 * Single unix specification:
1190 * We should -EINVAL if an element length is not >= 0 and fitting an
1191 * ssize_t. The total length is fitting an ssize_t
1192 *
1193 * Be careful here because iov_len is a size_t not an ssize_t
1194 */
1195 tot_len = 0;
1196 vector = iov;
1197 ret = -EINVAL;
1198 for (seg = 0 ; seg < nr_segs; seg++) {
1199 compat_ssize_t tmp = tot_len;
1200 compat_ssize_t len;
1201 compat_uptr_t buf;
1202
1203 if (__get_user(len, &uvector->iov_len) ||
1204 __get_user(buf, &uvector->iov_base)) {
1205 ret = -EFAULT;
1206 goto out;
1207 }
1208 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1209 goto out;
1210 tot_len += len;
1211 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1212 goto out;
1213 vector->iov_base = compat_ptr(buf);
1214 vector->iov_len = (compat_size_t) len;
1215 uvector++;
1216 vector++;
1217 }
1218 if (tot_len == 0) {
1219 ret = 0;
1220 goto out;
1221 }
1222
1223 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1224 if (ret < 0)
1da177e4
LT		 1225 goto out;
1226
e7edf9cd
JM		 1227 ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
1228 if (ret)
1229 goto out;
1230
1da177e4
LT		 1231 fnv = NULL;
1232 if (type == READ) {
1233 fn = file->f_op->read;
ee0b3e67 1234 fnv = file->f_op->aio_read;
1da177e4
LT		 1235 } else {
1236 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1237 fnv = file->f_op->aio_write;
1da177e4
LT		 1238 }
1239
ee0b3e67
BP		 1240 if (fnv)
1241 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1242 pos, fnv);
1243 else
1244 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1245
1da177e4
LT		 1246out:
1247 if (iov != iovstack)
1248 kfree(iov);
0eeca283
RL		 1249 if ((ret + (type == READ)) > 0) {
1250 struct dentry *dentry = file->f_dentry;
1251 if (type == READ)
1252 fsnotify_access(dentry);
1253 else
1254 fsnotify_modify(dentry);
1255 }
1da177e4
LT		 1256 return ret;
1257}
1258
1259asmlinkage ssize_t
1260compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1261{
1262 struct file *file;
1263 ssize_t ret = -EBADF;
1264
1265 file = fget(fd);
1266 if (!file)
1267 return -EBADF;
1268
1269 if (!(file->f_mode & FMODE_READ))
1270 goto out;
1271
1272 ret = -EINVAL;
ee0b3e67 1273 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1274 goto out;
1275
1276 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1277
1278out:
1279 fput(file);
1280 return ret;
1281}
1282
1283asmlinkage ssize_t
1284compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1285{
1286 struct file *file;
1287 ssize_t ret = -EBADF;
1288
1289 file = fget(fd);
1290 if (!file)
1291 return -EBADF;
1292 if (!(file->f_mode & FMODE_WRITE))
1293 goto out;
1294
1295 ret = -EINVAL;
ee0b3e67 1296 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1297 goto out;
1298
1299 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1300
1301out:
1302 fput(file);
1303 return ret;
1304}
1305
d2610202
AK		 1306asmlinkage long
1307compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1308 unsigned int nr_segs, unsigned int flags)
1309{
1310 unsigned i;
1311 struct iovec *iov;
98232d50 1312 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1313 return -EINVAL;
1314 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1315 for (i = 0; i < nr_segs; i++) {
1316 struct compat_iovec v;
1317 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1318 get_user(v.iov_len, &iov32[i].iov_len) ||
1319 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1320 put_user(v.iov_len, &iov[i].iov_len))
1321 return -EFAULT;
1322 }
1323 return sys_vmsplice(fd, iov, nr_segs, flags);
1324}
1325
e922efc3
MS		 1326/*
1327 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1328 * O_LARGEFILE flag.
1329 */
1330asmlinkage long
1331compat_sys_open(const char __user *filename, int flags, int mode)
1332{
5590ff0d
UD		 1333 return do_sys_open(AT_FDCWD, filename, flags, mode);
1334}
1335
1336/*
1337 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1338 * O_LARGEFILE flag.
1339 */
1340asmlinkage long
9ad11ab4 1341compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1342{
1343 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1344}
1345
1da177e4
LT		 1346/*
1347 * compat_count() counts the number of arguments/envelopes. It is basically
1348 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1349 * and envp pointers.
1350 */
1351static int compat_count(compat_uptr_t __user *argv, int max)
1352{
1353 int i = 0;
1354
1355 if (argv != NULL) {
1356 for (;;) {
1357 compat_uptr_t p;
1358
1359 if (get_user(p, argv))
1360 return -EFAULT;
1361 if (!p)
1362 break;
1363 argv++;
1364 if(++i > max)
1365 return -E2BIG;
1366 }
1367 }
1368 return i;
1369}
1370
1371/*
1372 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1373 * except that it works with 32 bit argv and envp pointers.
1374 */
1375static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1376 struct linux_binprm *bprm)
1377{
1378 struct page *kmapped_page = NULL;
1379 char *kaddr = NULL;
1380 int ret;
1381
1382 while (argc-- > 0) {
1383 compat_uptr_t str;
1384 int len;
1385 unsigned long pos;
1386
1387 if (get_user(str, argv+argc) ||
1388 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1389 ret = -EFAULT;
1390 goto out;
1391 }
1392
1393 if (bprm->p < len) {
1394 ret = -E2BIG;
1395 goto out;
1396 }
1397
1398 bprm->p -= len;
1399 /* XXX: add architecture specific overflow check here. */
1400 pos = bprm->p;
1401
1402 while (len > 0) {
1403 int i, new, err;
1404 int offset, bytes_to_copy;
1405 struct page *page;
1406
1407 offset = pos % PAGE_SIZE;
1408 i = pos/PAGE_SIZE;
1409 page = bprm->page[i];
1410 new = 0;
1411 if (!page) {
1412 page = alloc_page(GFP_HIGHUSER);
1413 bprm->page[i] = page;
1414 if (!page) {
1415 ret = -ENOMEM;
1416 goto out;
1417 }
1418 new = 1;
1419 }
1420
1421 if (page != kmapped_page) {
1422 if (kmapped_page)
1423 kunmap(kmapped_page);
1424 kmapped_page = page;
1425 kaddr = kmap(kmapped_page);
1426 }
1427 if (new && offset)
1428 memset(kaddr, 0, offset);
1429 bytes_to_copy = PAGE_SIZE - offset;
1430 if (bytes_to_copy > len) {
1431 bytes_to_copy = len;
1432 if (new)
1433 memset(kaddr+offset+len, 0,
1434 PAGE_SIZE-offset-len);
1435 }
1436 err = copy_from_user(kaddr+offset, compat_ptr(str),
1437 bytes_to_copy);
1438 if (err) {
1439 ret = -EFAULT;
1440 goto out;
1441 }
1442
1443 pos += bytes_to_copy;
1444 str += bytes_to_copy;
1445 len -= bytes_to_copy;
1446 }
1447 }
1448 ret = 0;
1449out:
1450 if (kmapped_page)
1451 kunmap(kmapped_page);
1452 return ret;
1453}
1454
1455#ifdef CONFIG_MMU
1456
1457#define free_arg_pages(bprm) do { } while (0)
1458
1459#else
1460
1461static inline void free_arg_pages(struct linux_binprm *bprm)
1462{
1463 int i;
1464
1465 for (i = 0; i < MAX_ARG_PAGES; i++) {
1466 if (bprm->page[i])
1467 __free_page(bprm->page[i]);
1468 bprm->page[i] = NULL;
1469 }
1470}
1471
1472#endif /* CONFIG_MMU */
1473
1474/*
1475 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1476 * that it processes 32 bit argv and envp pointers.
1477 */
1478int compat_do_execve(char * filename,
1479 compat_uptr_t __user *argv,
1480 compat_uptr_t __user *envp,
1481 struct pt_regs * regs)
1482{
1483 struct linux_binprm *bprm;
1484 struct file *file;
1485 int retval;
1486 int i;
1487
1488 retval = -ENOMEM;
11b0b5ab 1489 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4
LT		 1490 if (!bprm)
1491 goto out_ret;
1da177e4
LT		 1492
1493 file = open_exec(filename);
1494 retval = PTR_ERR(file);
1495 if (IS_ERR(file))
1496 goto out_kfree;
1497
1498 sched_exec();
1499
1500 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1501 bprm->file = file;
1502 bprm->filename = filename;
1503 bprm->interp = filename;
1504 bprm->mm = mm_alloc();
1505 retval = -ENOMEM;
1506 if (!bprm->mm)
1507 goto out_file;
1508
1509 retval = init_new_context(current, bprm->mm);
1510 if (retval < 0)
1511 goto out_mm;
1512
1513 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1514 if ((retval = bprm->argc) < 0)
1515 goto out_mm;
1516
1517 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1518 if ((retval = bprm->envc) < 0)
1519 goto out_mm;
1520
1521 retval = security_bprm_alloc(bprm);
1522 if (retval)
1523 goto out;
1524
1525 retval = prepare_binprm(bprm);
1526 if (retval < 0)
1527 goto out;
1528
1529 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1530 if (retval < 0)
1531 goto out;
1532
1533 bprm->exec = bprm->p;
1534 retval = compat_copy_strings(bprm->envc, envp, bprm);
1535 if (retval < 0)
1536 goto out;
1537
1538 retval = compat_copy_strings(bprm->argc, argv, bprm);
1539 if (retval < 0)
1540 goto out;
1541
1542 retval = search_binary_handler(bprm, regs);
1543 if (retval >= 0) {
1544 free_arg_pages(bprm);
1545
1546 /* execve success */
1547 security_bprm_free(bprm);
4a805e86 1548 acct_update_integrals(current);
1da177e4
LT		 1549 kfree(bprm);
1550 return retval;
1551 }
1552
1553out:
1554 /* Something went wrong, return the inode and free the argument pages*/
1555 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1556 struct page * page = bprm->page[i];
1557 if (page)
1558 __free_page(page);
1559 }
1560
1561 if (bprm->security)
1562 security_bprm_free(bprm);
1563
1564out_mm:
1565 if (bprm->mm)
1566 mmdrop(bprm->mm);
1567
1568out_file:
1569 if (bprm->file) {
1570 allow_write_access(bprm->file);
1571 fput(bprm->file);
1572 }
1573
1574out_kfree:
1575 kfree(bprm);
1576
1577out_ret:
1578 return retval;
1579}
1580
1581#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1582
1583#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
1584
1585/*
1586 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1587 * 64-bit unsigned longs.
1588 */
858119e1 1589static
1da177e4
LT		 1590int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1591 unsigned long *fdset)
1592{
1593 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1594 if (ufdset) {
1595 unsigned long odd;
1596
1597 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1598 return -EFAULT;
1599
1600 odd = nr & 1UL;
1601 nr &= ~1UL;
1602 while (nr) {
1603 unsigned long h, l;
1604 __get_user(l, ufdset);
1605 __get_user(h, ufdset+1);
1606 ufdset += 2;
1607 *fdset++ = h << 32 | l;
1608 nr -= 2;
1609 }
1610 if (odd)
1611 __get_user(*fdset, ufdset);
1612 } else {
1613 /* Tricky, must clear full unsigned long in the
1614 * kernel fdset at the end, this makes sure that
1615 * actually happens.
1616 */
1617 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1618 }
1619 return 0;
1620}
1621
858119e1 1622static
1da177e4
LT		 1623void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1624 unsigned long *fdset)
1625{
1626 unsigned long odd;
1627 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1628
1629 if (!ufdset)
1630 return;
1631
1632 odd = nr & 1UL;
1633 nr &= ~1UL;
1634 while (nr) {
1635 unsigned long h, l;
1636 l = *fdset++;
1637 h = l >> 32;
1638 __put_user(l, ufdset);
1639 __put_user(h, ufdset+1);
1640 ufdset += 2;
1641 nr -= 2;
1642 }
1643 if (odd)
1644 __put_user(*fdset, ufdset);
1645}
1646
1647
1648/*
1649 * This is a virtual copy of sys_select from fs/select.c and probably
1650 * should be compared to it from time to time
1651 */
1da177e4
LT		 1652
1653/*
1654 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1655 * like to be certain this leads to no problems. So I return
1656 * EINTR just for safety.
1657 *
1658 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1659 * I'm trying ERESTARTNOHAND which restart only when you want to.
1660 */
1661#define MAX_SELECT_SECONDS \
1662 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1663
9f72949f
DW		 1664int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1665 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1da177e4
LT		 1666{
1667 fd_set_bits fds;
1668 char *bits;
1da177e4 1669 int size, max_fdset, ret = -EINVAL;
a4531edd 1670 struct fdtable *fdt;
1da177e4 1671
1da177e4
LT		 1672 if (n < 0)
1673 goto out_nofds;
1674
1675 /* max_fdset can increase, so grab it once to avoid race */
ac5b8b6f 1676 rcu_read_lock();
a4531edd
LT		 1677 fdt = files_fdtable(current->files);
1678 max_fdset = fdt->max_fdset;
ac5b8b6f 1679 rcu_read_unlock();
1da177e4
LT		 1680 if (n > max_fdset)
1681 n = max_fdset;
1682
1683 /*
1684 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1685 * since we used fdset we need to allocate memory in units of
1686 * long-words.
1687 */
1688 ret = -ENOMEM;
1689 size = FDS_BYTES(n);
68c3431a 1690 bits = kmalloc(6 * size, GFP_KERNEL);
1da177e4
LT		 1691 if (!bits)
1692 goto out_nofds;
1693 fds.in = (unsigned long *) bits;
1694 fds.out = (unsigned long *) (bits + size);
1695 fds.ex = (unsigned long *) (bits + 2*size);
1696 fds.res_in = (unsigned long *) (bits + 3*size);
1697 fds.res_out = (unsigned long *) (bits + 4*size);
1698 fds.res_ex = (unsigned long *) (bits + 5*size);
1699
1700 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1701 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1702 (ret = compat_get_fd_set(n, exp, fds.ex)))
1703 goto out;
1704 zero_fd_set(n, fds.res_in);
1705 zero_fd_set(n, fds.res_out);
1706 zero_fd_set(n, fds.res_ex);
1707
9f72949f 1708 ret = do_select(n, &fds, timeout);
1da177e4
LT		 1709
1710 if (ret < 0)
1711 goto out;
1712 if (!ret) {
1713 ret = -ERESTARTNOHAND;
1714 if (signal_pending(current))
1715 goto out;
1716 ret = 0;
1717 }
1718
1719 compat_set_fd_set(n, inp, fds.res_in);
1720 compat_set_fd_set(n, outp, fds.res_out);
1721 compat_set_fd_set(n, exp, fds.res_ex);
1722
1723out:
68c3431a 1724 kfree(bits);
1da177e4
LT		 1725out_nofds:
1726 return ret;
1727}
1728
9f72949f
DW		 1729asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1730 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1731 struct compat_timeval __user *tvp)
1732{
1733 s64 timeout = -1;
1734 struct compat_timeval tv;
1735 int ret;
1736
1737 if (tvp) {
1738 if (copy_from_user(&tv, tvp, sizeof(tv)))
1739 return -EFAULT;
1740
1741 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1742 return -EINVAL;
1743
1744 /* Cast to u64 to make GCC stop complaining */
1745 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1746 timeout = -1; /* infinite */
1747 else {
7e732bfc 1748 timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
9f72949f
DW		 1749 timeout += tv.tv_sec * HZ;
1750 }
1751 }
1752
1753 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1754
1755 if (tvp) {
643a6545
AM		 1756 struct compat_timeval rtv;
1757
9f72949f
DW		 1758 if (current->personality & STICKY_TIMEOUTS)
1759 goto sticky;
643a6545
AM		 1760 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1761 rtv.tv_sec = timeout;
74910e6c 1762 if (compat_timeval_compare(&rtv, &tv) >= 0)
643a6545
AM		 1763 rtv = tv;
1764 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
9f72949f
DW		 1765sticky:
1766 /*
1767 * If an application puts its timeval in read-only
1768 * memory, we don't want the Linux-specific update to
1769 * the timeval to cause a fault after the select has
1770 * completed successfully. However, because we're not
1771 * updating the timeval, we can't restart the system
1772 * call.
1773 */
1774 if (ret == -ERESTARTNOHAND)
1775 ret = -EINTR;
1776 }
1777 }
1778
1779 return ret;
1780}
1781
1782#ifdef TIF_RESTORE_SIGMASK
1783asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1784 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1785 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1786 compat_size_t sigsetsize)
1787{
1788 compat_sigset_t ss32;
1789 sigset_t ksigmask, sigsaved;
cb82a6cd 1790 s64 timeout = MAX_SCHEDULE_TIMEOUT;
9f72949f
DW		 1791 struct compat_timespec ts;
1792 int ret;
1793
1794 if (tsp) {
1795 if (copy_from_user(&ts, tsp, sizeof(ts)))
1796 return -EFAULT;
1797
1798 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1799 return -EINVAL;
1800 }
1801
1802 if (sigmask) {
1803 if (sigsetsize != sizeof(compat_sigset_t))
1804 return -EINVAL;
1805 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1806 return -EFAULT;
1807 sigset_from_compat(&ksigmask, &ss32);
1808
1809 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1810 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1811 }
1812
1813 do {
1814 if (tsp) {
1815 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1816 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1817 timeout += ts.tv_sec * (unsigned long)HZ;
1818 ts.tv_sec = 0;
1819 ts.tv_nsec = 0;
1820 } else {
1821 ts.tv_sec -= MAX_SELECT_SECONDS;
1822 timeout = MAX_SELECT_SECONDS * HZ;
1823 }
1824 }
1825
1826 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1827
1828 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1829
75833345 1830 if (ret == 0 && tsp && !(current->personality & STICKY_TIMEOUTS)) {
643a6545
AM		 1831 struct compat_timespec rts;
1832
1833 rts.tv_sec = timeout / HZ;
1834 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1835 if (rts.tv_nsec >= NSEC_PER_SEC) {
1836 rts.tv_sec++;
1837 rts.tv_nsec -= NSEC_PER_SEC;
9f72949f 1838 }
74910e6c 1839 if (compat_timespec_compare(&rts, &ts) >= 0)
643a6545 1840 rts = ts;
75833345
AK		 1841 if (copy_to_user(tsp, &rts, sizeof(rts)))
1842 ret = -EFAULT;
9f72949f
DW		 1843 }
1844
1845 if (ret == -ERESTARTNOHAND) {
1846 /*
1847 * Don't restore the signal mask yet. Let do_signal() deliver
1848 * the signal on the way back to userspace, before the signal
1849 * mask is restored.
1850 */
1851 if (sigmask) {
1852 memcpy(&current->saved_sigmask, &sigsaved,
1853 sizeof(sigsaved));
1854 set_thread_flag(TIF_RESTORE_SIGMASK);
1855 }
1856 } else if (sigmask)
1857 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1858
1859 return ret;
1860}
1861
1862asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1863 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1864 struct compat_timespec __user *tsp, void __user *sig)
1865{
1866 compat_size_t sigsetsize = 0;
1867 compat_uptr_t up = 0;
1868
1869 if (sig) {
1870 if (!access_ok(VERIFY_READ, sig,
1871 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1872 __get_user(up, (compat_uptr_t __user *)sig) ||
1873 __get_user(sigsetsize,
1874 (compat_size_t __user *)(sig+sizeof(up))))
1875 return -EFAULT;
1876 }
1877 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1878 sigsetsize);
1879}
1880
1881asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1882 unsigned int nfds, struct compat_timespec __user *tsp,
1883 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1884{
1885 compat_sigset_t ss32;
1886 sigset_t ksigmask, sigsaved;
1887 struct compat_timespec ts;
1888 s64 timeout = -1;
1889 int ret;
1890
1891 if (tsp) {
1892 if (copy_from_user(&ts, tsp, sizeof(ts)))
1893 return -EFAULT;
1894
1895 /* We assume that ts.tv_sec is always lower than
1896 the number of seconds that can be expressed in
1897 an s64. Otherwise the compiler bitches at us */
7e732bfc 1898 timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
9f72949f
DW		 1899 timeout += ts.tv_sec * HZ;
1900 }
1901
1902 if (sigmask) {
3835a9bd 1903 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1904 return -EINVAL;
1905 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1906 return -EFAULT;
1907 sigset_from_compat(&ksigmask, &ss32);
1908
1909 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1910 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1911 }
1912
1913 ret = do_sys_poll(ufds, nfds, &timeout);
1914
1915 /* We can restart this syscall, usually */
1916 if (ret == -EINTR) {
1917 /*
1918 * Don't restore the signal mask yet. Let do_signal() deliver
1919 * the signal on the way back to userspace, before the signal
1920 * mask is restored.
1921 */
1922 if (sigmask) {
1923 memcpy(&current->saved_sigmask, &sigsaved,
1924 sizeof(sigsaved));
1925 set_thread_flag(TIF_RESTORE_SIGMASK);
1926 }
1927 ret = -ERESTARTNOHAND;
1928 } else if (sigmask)
1929 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1930
1931 if (tsp && timeout >= 0) {
643a6545
AM		 1932 struct compat_timespec rts;
1933
9f72949f
DW		 1934 if (current->personality & STICKY_TIMEOUTS)
1935 goto sticky;
1936 /* Yes, we know it's actually an s64, but it's also positive. */
643a6545
AM		 1937 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1938 1000;
1939 rts.tv_sec = timeout;
74910e6c 1940 if (compat_timespec_compare(&rts, &ts) >= 0)
643a6545
AM		 1941 rts = ts;
1942 if (copy_to_user(tsp, &rts, sizeof(rts))) {
9f72949f
DW		 1943sticky:
1944 /*
1945 * If an application puts its timeval in read-only
1946 * memory, we don't want the Linux-specific update to
1947 * the timeval to cause a fault after the select has
1948 * completed successfully. However, because we're not
1949 * updating the timeval, we can't restart the system
1950 * call.
1951 */
1952 if (ret == -ERESTARTNOHAND && timeout >= 0)
1953 ret = -EINTR;
1954 }
1955 }
1956
1957 return ret;
1958}
1959#endif /* TIF_RESTORE_SIGMASK */
1960
1da177e4
LT		 1961#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1962/* Stuff for NFS server syscalls... */
1963struct compat_nfsctl_svc {
1964 u16 svc32_port;
1965 s32 svc32_nthreads;
1966};
1967
1968struct compat_nfsctl_client {
1969 s8 cl32_ident[NFSCLNT_IDMAX+1];
1970 s32 cl32_naddr;
1971 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1972 s32 cl32_fhkeytype;
1973 s32 cl32_fhkeylen;
1974 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1975};
1976
1977struct compat_nfsctl_export {
1978 char ex32_client[NFSCLNT_IDMAX+1];
1979 char ex32_path[NFS_MAXPATHLEN+1];
1980 compat_dev_t ex32_dev;
1981 compat_ino_t ex32_ino;
1982 compat_int_t ex32_flags;
202e5979
SR		 1983 __compat_uid_t ex32_anon_uid;
1984 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1985};
1986
1987struct compat_nfsctl_fdparm {
1988 struct sockaddr gd32_addr;
1989 s8 gd32_path[NFS_MAXPATHLEN+1];
1990 compat_int_t gd32_version;
1991};
1992
1993struct compat_nfsctl_fsparm {
1994 struct sockaddr gd32_addr;
1995 s8 gd32_path[NFS_MAXPATHLEN+1];
1996 compat_int_t gd32_maxlen;
1997};
1998
1999struct compat_nfsctl_arg {
2000 compat_int_t ca32_version; /* safeguard */
2001 union {
2002 struct compat_nfsctl_svc u32_svc;
2003 struct compat_nfsctl_client u32_client;
2004 struct compat_nfsctl_export u32_export;
2005 struct compat_nfsctl_fdparm u32_getfd;
2006 struct compat_nfsctl_fsparm u32_getfs;
2007 } u;
2008#define ca32_svc u.u32_svc
2009#define ca32_client u.u32_client
2010#define ca32_export u.u32_export
2011#define ca32_getfd u.u32_getfd
2012#define ca32_getfs u.u32_getfs
2013};
2014
2015union compat_nfsctl_res {
2016 __u8 cr32_getfh[NFS_FHSIZE];
2017 struct knfsd_fh cr32_getfs;
2018};
2019
d64b1c87
LFS		 2020static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2021 struct compat_nfsctl_arg __user *arg)
1da177e4 2022{
d64b1c87
LFS		 2023 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2024 get_user(karg->ca_version, &arg->ca32_version) ||
2025 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2026 __get_user(karg->ca_svc.svc_nthreads,
2027 &arg->ca32_svc.svc32_nthreads))
2028 return -EFAULT;
2029 return 0;
1da177e4
LT		 2030}
2031
d64b1c87
LFS		 2032static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2033 struct compat_nfsctl_arg __user *arg)
1da177e4 2034{
d64b1c87
LFS		 2035 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2036 sizeof(arg->ca32_client)) ||
2037 get_user(karg->ca_version, &arg->ca32_version) ||
2038 __copy_from_user(&karg->ca_client.cl_ident[0],
2039 &arg->ca32_client.cl32_ident[0],
2040 NFSCLNT_IDMAX) ||
2041 __get_user(karg->ca_client.cl_naddr,
2042 &arg->ca32_client.cl32_naddr) ||
2043 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2044 &arg->ca32_client.cl32_addrlist[0],
2045 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2046 __get_user(karg->ca_client.cl_fhkeytype,
2047 &arg->ca32_client.cl32_fhkeytype) ||
2048 __get_user(karg->ca_client.cl_fhkeylen,
2049 &arg->ca32_client.cl32_fhkeylen) ||
2050 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2051 &arg->ca32_client.cl32_fhkey[0],
2052 NFSCLNT_KEYMAX))
2053 return -EFAULT;
1da177e4 2054
d64b1c87 2055 return 0;
1da177e4
LT		 2056}
2057
d64b1c87
LFS		 2058static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2059 struct compat_nfsctl_arg __user *arg)
1da177e4 2060{
d64b1c87
LFS		 2061 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2062 sizeof(arg->ca32_export)) ||
2063 get_user(karg->ca_version, &arg->ca32_version) ||
2064 __copy_from_user(&karg->ca_export.ex_client[0],
2065 &arg->ca32_export.ex32_client[0],
2066 NFSCLNT_IDMAX) ||
2067 __copy_from_user(&karg->ca_export.ex_path[0],
2068 &arg->ca32_export.ex32_path[0],
2069 NFS_MAXPATHLEN) ||
2070 __get_user(karg->ca_export.ex_dev,
2071 &arg->ca32_export.ex32_dev) ||
2072 __get_user(karg->ca_export.ex_ino,
2073 &arg->ca32_export.ex32_ino) ||
2074 __get_user(karg->ca_export.ex_flags,
2075 &arg->ca32_export.ex32_flags) ||
2076 __get_user(karg->ca_export.ex_anon_uid,
2077 &arg->ca32_export.ex32_anon_uid) ||
2078 __get_user(karg->ca_export.ex_anon_gid,
2079 &arg->ca32_export.ex32_anon_gid))
2080 return -EFAULT;
1da177e4
LT		 2081 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2082 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2083
d64b1c87 2084 return 0;
1da177e4
LT		 2085}
2086
d64b1c87
LFS		 2087static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2088 struct compat_nfsctl_arg __user *arg)
1da177e4 2089{
d64b1c87
LFS		 2090 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2091 sizeof(arg->ca32_getfd)) ||
2092 get_user(karg->ca_version, &arg->ca32_version) ||
2093 __copy_from_user(&karg->ca_getfd.gd_addr,
2094 &arg->ca32_getfd.gd32_addr,
2095 (sizeof(struct sockaddr))) ||
2096 __copy_from_user(&karg->ca_getfd.gd_path,
2097 &arg->ca32_getfd.gd32_path,
2098 (NFS_MAXPATHLEN+1)) ||
2099 __get_user(karg->ca_getfd.gd_version,
2100 &arg->ca32_getfd.gd32_version))
2101 return -EFAULT;
1da177e4 2102
d64b1c87 2103 return 0;
1da177e4
LT		 2104}
2105
d64b1c87
LFS		 2106static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2107 struct compat_nfsctl_arg __user *arg)
1da177e4 2108{
d64b1c87
LFS		 2109 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2110 get_user(karg->ca_version, &arg->ca32_version) ||
2111 __copy_from_user(&karg->ca_getfs.gd_addr,
2112 &arg->ca32_getfs.gd32_addr,
2113 (sizeof(struct sockaddr))) ||
2114 __copy_from_user(&karg->ca_getfs.gd_path,
2115 &arg->ca32_getfs.gd32_path,
2116 (NFS_MAXPATHLEN+1)) ||
2117 __get_user(karg->ca_getfs.gd_maxlen,
2118 &arg->ca32_getfs.gd32_maxlen))
2119 return -EFAULT;
1da177e4 2120
d64b1c87 2121 return 0;
1da177e4
LT		 2122}
2123
2124/* This really doesn't need translations, we are only passing
2125 * back a union which contains opaque nfs file handle data.
2126 */
d64b1c87
LFS		 2127static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2128 union compat_nfsctl_res __user *res)
1da177e4
LT		 2129{
2130 int err;
2131
2132 err = copy_to_user(res, kres, sizeof(*res));
2133
2134 return (err) ? -EFAULT : 0;
2135}
2136
d64b1c87
LFS		 2137asmlinkage long compat_sys_nfsservctl(int cmd,
2138 struct compat_nfsctl_arg __user *arg,
2139 union compat_nfsctl_res __user *res)
1da177e4
LT		 2140{
2141 struct nfsctl_arg *karg;
2142 union nfsctl_res *kres;
2143 mm_segment_t oldfs;
2144 int err;
2145
2146 karg = kmalloc(sizeof(*karg), GFP_USER);
2147 kres = kmalloc(sizeof(*kres), GFP_USER);
2148 if(!karg || !kres) {
2149 err = -ENOMEM;
2150 goto done;
2151 }
2152
2153 switch(cmd) {
2154 case NFSCTL_SVC:
2155 err = compat_nfs_svc_trans(karg, arg);
2156 break;
2157
2158 case NFSCTL_ADDCLIENT:
2159 err = compat_nfs_clnt_trans(karg, arg);
2160 break;
2161
2162 case NFSCTL_DELCLIENT:
2163 err = compat_nfs_clnt_trans(karg, arg);
2164 break;
2165
2166 case NFSCTL_EXPORT:
2167 case NFSCTL_UNEXPORT:
2168 err = compat_nfs_exp_trans(karg, arg);
2169 break;
2170
2171 case NFSCTL_GETFD:
2172 err = compat_nfs_getfd_trans(karg, arg);
2173 break;
2174
2175 case NFSCTL_GETFS:
2176 err = compat_nfs_getfs_trans(karg, arg);
2177 break;
2178
2179 default:
2180 err = -EINVAL;
57070d01 2181 break;
1da177e4
LT		 2182 }
2183
57070d01
PS		 2184 if (err)
2185 goto done;
2186
1da177e4
LT		 2187 oldfs = get_fs();
2188 set_fs(KERNEL_DS);
2189 /* The __user pointer casts are valid because of the set_fs() */
2190 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2191 set_fs(oldfs);
2192
2193 if (err)
2194 goto done;
2195
2196 if((cmd == NFSCTL_GETFD) ||
2197 (cmd == NFSCTL_GETFS))
2198 err = compat_nfs_getfh_res_trans(kres, res);
2199
2200done:
2201 kfree(karg);
2202 kfree(kres);
2203 return err;
2204}
2205#else /* !NFSD */
2206long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2207{
2208 return sys_ni_syscall();
2209}
2210#endif
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