]> 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
drivers/block/floppy.c: remove unnecessary casting in fd_ioctl
[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>
9f3acc31 27#include <linux/fdtable.h>
1da177e4 28#include <linux/vfs.h>
1da177e4
LT		 29#include <linux/ioctl.h>
30#include <linux/init.h>
1da177e4
LT		 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/syscalls.h>
36#include <linux/ctype.h>
37#include <linux/module.h>
38#include <linux/dirent.h>
0eeca283 39#include <linux/fsnotify.h>
1da177e4 40#include <linux/highuid.h>
1da177e4
LT		 41#include <linux/nfsd/syscall.h>
42#include <linux/personality.h>
43#include <linux/rwsem.h>
8f0ab514 44#include <linux/tsacct_kern.h>
6272e266 45#include <linux/security.h>
a1f8e7f7 46#include <linux/highmem.h>
6d18c922 47#include <linux/signal.h>
bd01f843 48#include <linux/poll.h>
4a805e86 49#include <linux/mm.h>
f6dfb4fd 50#include <linux/eventpoll.h>
498052bb 51#include <linux/fs_struct.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{
1c710c89 80 struct timespec tv[2];
1da177e4
LT		 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;
1c710c89
UD		 86 tv[0].tv_nsec = 0;
87 tv[1].tv_nsec = 0;
1da177e4 88 }
1c710c89
UD		 89 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
90}
91
92asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
93{
94 struct timespec tv[2];
95
96 if (t) {
97 if (get_compat_timespec(&tv[0], &t[0]) ||
98 get_compat_timespec(&tv[1], &t[1]))
99 return -EFAULT;
100
1c710c89
UD		 101 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
102 return 0;
103 }
104 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 105}
106
9ad11ab4 107asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4 108{
1c710c89 109 struct timespec tv[2];
1da177e4 110
9ad11ab4 111 if (t) {
1da177e4 112 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 113 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 114 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 115 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 116 return -EFAULT;
1c710c89
UD		 117 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
118 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
119 return -EINVAL;
120 tv[0].tv_nsec *= 1000;
121 tv[1].tv_nsec *= 1000;
9ad11ab4 122 }
1c710c89 123 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 124}
125
126asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
127{
128 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 129}
130
f7a5000f
CH		 131static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
132{
133 compat_ino_t ino = stat->ino;
134 typeof(ubuf->st_uid) uid = 0;
135 typeof(ubuf->st_gid) gid = 0;
136 int err;
137
138 SET_UID(uid, stat->uid);
139 SET_GID(gid, stat->gid);
140
141 if ((u64) stat->size > MAX_NON_LFS ||
142 !old_valid_dev(stat->dev) ||
143 !old_valid_dev(stat->rdev))
144 return -EOVERFLOW;
145 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
146 return -EOVERFLOW;
147
148 if (clear_user(ubuf, sizeof(*ubuf)))
149 return -EFAULT;
150
151 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
152 err |= __put_user(ino, &ubuf->st_ino);
153 err |= __put_user(stat->mode, &ubuf->st_mode);
154 err |= __put_user(stat->nlink, &ubuf->st_nlink);
155 err |= __put_user(uid, &ubuf->st_uid);
156 err |= __put_user(gid, &ubuf->st_gid);
157 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
158 err |= __put_user(stat->size, &ubuf->st_size);
159 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
160 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
161 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
162 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
163 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
164 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
165 err |= __put_user(stat->blksize, &ubuf->st_blksize);
166 err |= __put_user(stat->blocks, &ubuf->st_blocks);
167 return err;
168}
169
1da177e4
LT		 170asmlinkage long compat_sys_newstat(char __user * filename,
171 struct compat_stat __user *statbuf)
172{
173 struct kstat stat;
2eae7a18 174 int error;
1da177e4 175
2eae7a18
CH		 176 error = vfs_stat(filename, &stat);
177 if (error)
178 return error;
179 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 180}
181
182asmlinkage long compat_sys_newlstat(char __user * filename,
183 struct compat_stat __user *statbuf)
184{
185 struct kstat stat;
2eae7a18 186 int error;
1da177e4 187
2eae7a18
CH		 188 error = vfs_lstat(filename, &stat);
189 if (error)
190 return error;
191 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 192}
193
82d821dd 194#ifndef __ARCH_WANT_STAT64
9ad11ab4 195asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
5590ff0d
UD		 196 struct compat_stat __user *statbuf, int flag)
197{
198 struct kstat stat;
0112fc22 199 int error;
5590ff0d 200
0112fc22
OD		 201 error = vfs_fstatat(dfd, filename, &stat, flag);
202 if (error)
203 return error;
204 return cp_compat_stat(&stat, statbuf);
5590ff0d 205}
82d821dd 206#endif
5590ff0d 207
1da177e4
LT		 208asmlinkage long compat_sys_newfstat(unsigned int fd,
209 struct compat_stat __user * statbuf)
210{
211 struct kstat stat;
212 int error = vfs_fstat(fd, &stat);
213
214 if (!error)
215 error = cp_compat_stat(&stat, statbuf);
216 return error;
217}
218
219static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
220{
221
222 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 223 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
224 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 225 return -EOVERFLOW;
226 /* f_files and f_ffree may be -1; it's okay
227 * to stuff that into 32 bits */
228 if (kbuf->f_files != 0xffffffffffffffffULL
229 && (kbuf->f_files & 0xffffffff00000000ULL))
230 return -EOVERFLOW;
231 if (kbuf->f_ffree != 0xffffffffffffffffULL
232 && (kbuf->f_ffree & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 }
235 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
236 __put_user(kbuf->f_type, &ubuf->f_type) ||
237 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
238 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
239 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
240 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
241 __put_user(kbuf->f_files, &ubuf->f_files) ||
242 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
243 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
244 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
245 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
246 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
247 __put_user(0, &ubuf->f_spare[0]) ||
248 __put_user(0, &ubuf->f_spare[1]) ||
249 __put_user(0, &ubuf->f_spare[2]) ||
250 __put_user(0, &ubuf->f_spare[3]) ||
251 __put_user(0, &ubuf->f_spare[4]))
252 return -EFAULT;
253 return 0;
254}
255
256/*
257 * The following statfs calls are copies of code from fs/open.c and
258 * should be checked against those from time to time
259 */
2d8f3038 260asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 261{
2d8f3038 262 struct path path;
1da177e4
LT		 263 int error;
264
2d8f3038 265 error = user_path(pathname, &path);
1da177e4
LT		 266 if (!error) {
267 struct kstatfs tmp;
2d8f3038 268 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 269 if (!error)
270 error = put_compat_statfs(buf, &tmp);
2d8f3038 271 path_put(&path);
1da177e4
LT		 272 }
273 return error;
274}
275
276asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
277{
278 struct file * file;
279 struct kstatfs tmp;
280 int error;
281
282 error = -EBADF;
283 file = fget(fd);
284 if (!file)
285 goto out;
0f7fc9e4 286 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 287 if (!error)
288 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 289 fput(file);
290out:
291 return error;
292}
293
294static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
295{
296 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 297 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
298 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 299 return -EOVERFLOW;
300 /* f_files and f_ffree may be -1; it's okay
301 * to stuff that into 32 bits */
302 if (kbuf->f_files != 0xffffffffffffffffULL
303 && (kbuf->f_files & 0xffffffff00000000ULL))
304 return -EOVERFLOW;
305 if (kbuf->f_ffree != 0xffffffffffffffffULL
306 && (kbuf->f_ffree & 0xffffffff00000000ULL))
307 return -EOVERFLOW;
308 }
309 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
310 __put_user(kbuf->f_type, &ubuf->f_type) ||
311 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
312 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
313 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
314 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
315 __put_user(kbuf->f_files, &ubuf->f_files) ||
316 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
317 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
318 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
319 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
320 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
321 return -EFAULT;
322 return 0;
323}
324
2d8f3038 325asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 326{
2d8f3038 327 struct path path;
1da177e4
LT		 328 int error;
329
330 if (sz != sizeof(*buf))
331 return -EINVAL;
332
2d8f3038 333 error = user_path(pathname, &path);
1da177e4
LT		 334 if (!error) {
335 struct kstatfs tmp;
2d8f3038 336 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
2d8f3038 339 path_put(&path);
1da177e4
LT		 340 }
341 return error;
342}
343
344asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
345{
346 struct file * file;
347 struct kstatfs tmp;
348 int error;
349
350 if (sz != sizeof(*buf))
351 return -EINVAL;
352
353 error = -EBADF;
354 file = fget(fd);
355 if (!file)
356 goto out;
0f7fc9e4 357 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 358 if (!error)
359 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 360 fput(file);
361out:
362 return error;
363}
364
2b1c6bd7
CH		 365/*
366 * This is a copy of sys_ustat, just dealing with a structure layout.
367 * Given how simple this syscall is that apporach is more maintainable
368 * than the various conversion hacks.
369 */
370asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
371{
372 struct super_block *sb;
373 struct compat_ustat tmp;
374 struct kstatfs sbuf;
375 int err;
376
377 sb = user_get_super(new_decode_dev(dev));
378 if (!sb)
379 return -EINVAL;
380 err = vfs_statfs(sb->s_root, &sbuf);
381 drop_super(sb);
382 if (err)
383 return err;
384
385 memset(&tmp, 0, sizeof(struct compat_ustat));
386 tmp.f_tfree = sbuf.f_bfree;
387 tmp.f_tinode = sbuf.f_ffree;
388 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
389 return -EFAULT;
390 return 0;
391}
392
1da177e4
LT		 393static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
394{
395 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
396 __get_user(kfl->l_type, &ufl->l_type) ||
397 __get_user(kfl->l_whence, &ufl->l_whence) ||
398 __get_user(kfl->l_start, &ufl->l_start) ||
399 __get_user(kfl->l_len, &ufl->l_len) ||
400 __get_user(kfl->l_pid, &ufl->l_pid))
401 return -EFAULT;
402 return 0;
403}
404
405static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
406{
407 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
408 __put_user(kfl->l_type, &ufl->l_type) ||
409 __put_user(kfl->l_whence, &ufl->l_whence) ||
410 __put_user(kfl->l_start, &ufl->l_start) ||
411 __put_user(kfl->l_len, &ufl->l_len) ||
412 __put_user(kfl->l_pid, &ufl->l_pid))
413 return -EFAULT;
414 return 0;
415}
416
417#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
418static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
419{
420 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
421 __get_user(kfl->l_type, &ufl->l_type) ||
422 __get_user(kfl->l_whence, &ufl->l_whence) ||
423 __get_user(kfl->l_start, &ufl->l_start) ||
424 __get_user(kfl->l_len, &ufl->l_len) ||
425 __get_user(kfl->l_pid, &ufl->l_pid))
426 return -EFAULT;
427 return 0;
428}
429#endif
430
431#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
432static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
433{
434 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
435 __put_user(kfl->l_type, &ufl->l_type) ||
436 __put_user(kfl->l_whence, &ufl->l_whence) ||
437 __put_user(kfl->l_start, &ufl->l_start) ||
438 __put_user(kfl->l_len, &ufl->l_len) ||
439 __put_user(kfl->l_pid, &ufl->l_pid))
440 return -EFAULT;
441 return 0;
442}
443#endif
444
445asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
446 unsigned long arg)
447{
448 mm_segment_t old_fs;
449 struct flock f;
450 long ret;
451
452 switch (cmd) {
453 case F_GETLK:
454 case F_SETLK:
455 case F_SETLKW:
456 ret = get_compat_flock(&f, compat_ptr(arg));
457 if (ret != 0)
458 break;
459 old_fs = get_fs();
460 set_fs(KERNEL_DS);
461 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
462 set_fs(old_fs);
463 if (cmd == F_GETLK && ret == 0) {
ff677f8d 464 /* GETLK was successful and we need to return the data...
2520f14c
N		 465 * but it needs to fit in the compat structure.
466 * l_start shouldn't be too big, unless the original
467 * start + end is greater than COMPAT_OFF_T_MAX, in which
468 * case the app was asking for trouble, so we return
469 * -EOVERFLOW in that case.
470 * l_len could be too big, in which case we just truncate it,
471 * and only allow the app to see that part of the conflicting
472 * lock that might make sense to it anyway
473 */
474
475 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 476 ret = -EOVERFLOW;
2520f14c
N		 477 if (f.l_len > COMPAT_OFF_T_MAX)
478 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 479 if (ret == 0)
480 ret = put_compat_flock(&f, compat_ptr(arg));
481 }
482 break;
483
484 case F_GETLK64:
485 case F_SETLK64:
486 case F_SETLKW64:
487 ret = get_compat_flock64(&f, compat_ptr(arg));
488 if (ret != 0)
489 break;
490 old_fs = get_fs();
491 set_fs(KERNEL_DS);
492 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
493 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
494 (unsigned long)&f);
495 set_fs(old_fs);
496 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 497 /* need to return lock information - see above for commentary */
498 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 499 ret = -EOVERFLOW;
2520f14c
N		 500 if (f.l_len > COMPAT_LOFF_T_MAX)
501 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 502 if (ret == 0)
503 ret = put_compat_flock64(&f, compat_ptr(arg));
504 }
505 break;
506
507 default:
508 ret = sys_fcntl(fd, cmd, arg);
509 break;
510 }
511 return ret;
512}
513
514asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
515 unsigned long arg)
516{
517 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
518 return -EINVAL;
519 return compat_sys_fcntl64(fd, cmd, arg);
520}
521
522asmlinkage long
523compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
524{
525 long ret;
526 aio_context_t ctx64;
527
528 mm_segment_t oldfs = get_fs();
529 if (unlikely(get_user(ctx64, ctx32p)))
530 return -EFAULT;
531
532 set_fs(KERNEL_DS);
533 /* The __user pointer cast is valid because of the set_fs() */
534 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
535 set_fs(oldfs);
536 /* truncating is ok because it's a user address */
537 if (!ret)
538 ret = put_user((u32) ctx64, ctx32p);
539 return ret;
540}
541
542asmlinkage long
543compat_sys_io_getevents(aio_context_t ctx_id,
544 unsigned long min_nr,
545 unsigned long nr,
546 struct io_event __user *events,
547 struct compat_timespec __user *timeout)
548{
549 long ret;
550 struct timespec t;
551 struct timespec __user *ut = NULL;
552
553 ret = -EFAULT;
554 if (unlikely(!access_ok(VERIFY_WRITE, events,
555 nr * sizeof(struct io_event))))
556 goto out;
557 if (timeout) {
558 if (get_compat_timespec(&t, timeout))
559 goto out;
560
561 ut = compat_alloc_user_space(sizeof(*ut));
562 if (copy_to_user(ut, &t, sizeof(t)) )
563 goto out;
564 }
565 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
566out:
567 return ret;
568}
569
570static inline long
571copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
572{
573 compat_uptr_t uptr;
574 int i;
575
576 for (i = 0; i < nr; ++i) {
577 if (get_user(uptr, ptr32 + i))
578 return -EFAULT;
579 if (put_user(compat_ptr(uptr), ptr64 + i))
580 return -EFAULT;
581 }
582 return 0;
583}
584
585#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
586
587asmlinkage long
588compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
589{
590 struct iocb __user * __user *iocb64;
591 long ret;
592
593 if (unlikely(nr < 0))
594 return -EINVAL;
595
596 if (nr > MAX_AIO_SUBMITS)
597 nr = MAX_AIO_SUBMITS;
598
599 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
600 ret = copy_iocb(nr, iocb, iocb64);
601 if (!ret)
602 ret = sys_io_submit(ctx_id, nr, iocb64);
603 return ret;
604}
605
606struct compat_ncp_mount_data {
607 compat_int_t version;
608 compat_uint_t ncp_fd;
202e5979 609 __compat_uid_t mounted_uid;
1da177e4
LT		 610 compat_pid_t wdog_pid;
611 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
612 compat_uint_t time_out;
613 compat_uint_t retry_count;
614 compat_uint_t flags;
202e5979
SR		 615 __compat_uid_t uid;
616 __compat_gid_t gid;
1da177e4
LT		 617 compat_mode_t file_mode;
618 compat_mode_t dir_mode;
619};
620
621struct compat_ncp_mount_data_v4 {
622 compat_int_t version;
623 compat_ulong_t flags;
624 compat_ulong_t mounted_uid;
625 compat_long_t wdog_pid;
626 compat_uint_t ncp_fd;
627 compat_uint_t time_out;
628 compat_uint_t retry_count;
629 compat_ulong_t uid;
630 compat_ulong_t gid;
631 compat_ulong_t file_mode;
632 compat_ulong_t dir_mode;
633};
634
635static void *do_ncp_super_data_conv(void *raw_data)
636{
637 int version = *(unsigned int *)raw_data;
638
639 if (version == 3) {
640 struct compat_ncp_mount_data *c_n = raw_data;
641 struct ncp_mount_data *n = raw_data;
642
643 n->dir_mode = c_n->dir_mode;
644 n->file_mode = c_n->file_mode;
645 n->gid = c_n->gid;
646 n->uid = c_n->uid;
647 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
648 n->wdog_pid = c_n->wdog_pid;
649 n->mounted_uid = c_n->mounted_uid;
650 } else if (version == 4) {
651 struct compat_ncp_mount_data_v4 *c_n = raw_data;
652 struct ncp_mount_data_v4 *n = raw_data;
653
654 n->dir_mode = c_n->dir_mode;
655 n->file_mode = c_n->file_mode;
656 n->gid = c_n->gid;
657 n->uid = c_n->uid;
658 n->retry_count = c_n->retry_count;
659 n->time_out = c_n->time_out;
660 n->ncp_fd = c_n->ncp_fd;
661 n->wdog_pid = c_n->wdog_pid;
662 n->mounted_uid = c_n->mounted_uid;
663 n->flags = c_n->flags;
664 } else if (version != 5) {
665 return NULL;
666 }
667
668 return raw_data;
669}
670
671struct compat_smb_mount_data {
672 compat_int_t version;
202e5979
SR		 673 __compat_uid_t mounted_uid;
674 __compat_uid_t uid;
675 __compat_gid_t gid;
1da177e4
LT		 676 compat_mode_t file_mode;
677 compat_mode_t dir_mode;
678};
679
680static void *do_smb_super_data_conv(void *raw_data)
681{
682 struct smb_mount_data *s = raw_data;
683 struct compat_smb_mount_data *c_s = raw_data;
684
685 if (c_s->version != SMB_MOUNT_OLDVERSION)
686 goto out;
687 s->dir_mode = c_s->dir_mode;
688 s->file_mode = c_s->file_mode;
689 s->gid = c_s->gid;
690 s->uid = c_s->uid;
691 s->mounted_uid = c_s->mounted_uid;
692 out:
693 return raw_data;
694}
695
9a9947bf
DH		 696struct compat_nfs_string {
697 compat_uint_t len;
5fc3e624 698 compat_uptr_t data;
9a9947bf
DH		 699};
700
701static inline void compat_nfs_string(struct nfs_string *dst,
702 struct compat_nfs_string *src)
703{
704 dst->data = compat_ptr(src->data);
705 dst->len = src->len;
706}
707
708struct compat_nfs4_mount_data_v1 {
709 compat_int_t version;
710 compat_int_t flags;
711 compat_int_t rsize;
712 compat_int_t wsize;
713 compat_int_t timeo;
714 compat_int_t retrans;
715 compat_int_t acregmin;
716 compat_int_t acregmax;
717 compat_int_t acdirmin;
718 compat_int_t acdirmax;
719 struct compat_nfs_string client_addr;
720 struct compat_nfs_string mnt_path;
721 struct compat_nfs_string hostname;
722 compat_uint_t host_addrlen;
5fc3e624 723 compat_uptr_t host_addr;
9a9947bf
DH		 724 compat_int_t proto;
725 compat_int_t auth_flavourlen;
5fc3e624 726 compat_uptr_t auth_flavours;
9a9947bf
DH		 727};
728
729static int do_nfs4_super_data_conv(void *raw_data)
730{
731 int version = *(compat_uint_t *) raw_data;
732
733 if (version == 1) {
734 struct compat_nfs4_mount_data_v1 *raw = raw_data;
735 struct nfs4_mount_data *real = raw_data;
736
737 /* copy the fields backwards */
738 real->auth_flavours = compat_ptr(raw->auth_flavours);
739 real->auth_flavourlen = raw->auth_flavourlen;
740 real->proto = raw->proto;
741 real->host_addr = compat_ptr(raw->host_addr);
742 real->host_addrlen = raw->host_addrlen;
743 compat_nfs_string(&real->hostname, &raw->hostname);
744 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
745 compat_nfs_string(&real->client_addr, &raw->client_addr);
746 real->acdirmax = raw->acdirmax;
747 real->acdirmin = raw->acdirmin;
748 real->acregmax = raw->acregmax;
749 real->acregmin = raw->acregmin;
750 real->retrans = raw->retrans;
751 real->timeo = raw->timeo;
752 real->wsize = raw->wsize;
753 real->rsize = raw->rsize;
754 real->flags = raw->flags;
755 real->version = raw->version;
756 }
9a9947bf
DH		 757
758 return 0;
759}
760
1da177e4
LT		 761#define SMBFS_NAME "smbfs"
762#define NCPFS_NAME "ncpfs"
9a9947bf 763#define NFS4_NAME "nfs4"
1da177e4
LT		 764
765asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
766 char __user * type, unsigned long flags,
767 void __user * data)
768{
eca6f534 769 char *kernel_type;
1da177e4 770 unsigned long data_page;
eca6f534 771 char *kernel_dev;
1da177e4
LT		 772 char *dir_page;
773 int retval;
774
eca6f534 775 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 776 if (retval < 0)
777 goto out;
778
779 dir_page = getname(dir_name);
780 retval = PTR_ERR(dir_page);
781 if (IS_ERR(dir_page))
782 goto out1;
783
eca6f534 784 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 785 if (retval < 0)
786 goto out2;
787
eca6f534 788 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 789 if (retval < 0)
790 goto out3;
791
792 retval = -EINVAL;
793
eca6f534
VN		 794 if (kernel_type && data_page) {
795 if (!strcmp(kernel_type, SMBFS_NAME)) {
1da177e4 796 do_smb_super_data_conv((void *)data_page);
eca6f534 797 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 798 do_ncp_super_data_conv((void *)data_page);
eca6f534 799 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 800 if (do_nfs4_super_data_conv((void *) data_page))
801 goto out4;
1da177e4
LT		 802 }
803 }
804
eca6f534 805 retval = do_mount(kernel_dev, dir_page, kernel_type,
1da177e4 806 flags, (void*)data_page);
1da177e4 807
9a9947bf 808 out4:
1da177e4
LT		 809 free_page(data_page);
810 out3:
eca6f534 811 kfree(kernel_dev);
1da177e4
LT		 812 out2:
813 putname(dir_page);
814 out1:
eca6f534 815 kfree(kernel_type);
1da177e4
LT		 816 out:
817 return retval;
818}
819
820#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
1da177e4
LT		 821
822struct compat_old_linux_dirent {
823 compat_ulong_t d_ino;
824 compat_ulong_t d_offset;
825 unsigned short d_namlen;
826 char d_name[1];
827};
828
829struct compat_readdir_callback {
830 struct compat_old_linux_dirent __user *dirent;
831 int result;
832};
833
834static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 835 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 836{
837 struct compat_readdir_callback *buf = __buf;
838 struct compat_old_linux_dirent __user *dirent;
afefdbb2 839 compat_ulong_t d_ino;
1da177e4
LT		 840
841 if (buf->result)
842 return -EINVAL;
afefdbb2 843 d_ino = ino;
8f3f655d
AV		 844 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
845 buf->result = -EOVERFLOW;
afefdbb2 846 return -EOVERFLOW;
8f3f655d 847 }
1da177e4
LT		 848 buf->result++;
849 dirent = buf->dirent;
850 if (!access_ok(VERIFY_WRITE, dirent,
851 (unsigned long)(dirent->d_name + namlen + 1) -
852 (unsigned long)dirent))
853 goto efault;
afefdbb2 854 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 855 __put_user(offset, &dirent->d_offset) ||
856 __put_user(namlen, &dirent->d_namlen) ||
857 __copy_to_user(dirent->d_name, name, namlen) ||
858 __put_user(0, dirent->d_name + namlen))
859 goto efault;
860 return 0;
861efault:
862 buf->result = -EFAULT;
863 return -EFAULT;
864}
865
866asmlinkage long compat_sys_old_readdir(unsigned int fd,
867 struct compat_old_linux_dirent __user *dirent, unsigned int count)
868{
869 int error;
870 struct file *file;
871 struct compat_readdir_callback buf;
872
873 error = -EBADF;
874 file = fget(fd);
875 if (!file)
876 goto out;
877
878 buf.result = 0;
879 buf.dirent = dirent;
880
881 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 882 if (buf.result)
1da177e4
LT		 883 error = buf.result;
884
885 fput(file);
886out:
887 return error;
888}
889
890struct compat_linux_dirent {
891 compat_ulong_t d_ino;
892 compat_ulong_t d_off;
893 unsigned short d_reclen;
894 char d_name[1];
895};
896
897struct compat_getdents_callback {
898 struct compat_linux_dirent __user *current_dir;
899 struct compat_linux_dirent __user *previous;
900 int count;
901 int error;
902};
903
904static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 905 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 906{
907 struct compat_linux_dirent __user * dirent;
908 struct compat_getdents_callback *buf = __buf;
afefdbb2 909 compat_ulong_t d_ino;
022a1692 910 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 911
912 buf->error = -EINVAL; /* only used if we fail.. */
913 if (reclen > buf->count)
914 return -EINVAL;
afefdbb2 915 d_ino = ino;
8f3f655d
AV		 916 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
917 buf->error = -EOVERFLOW;
afefdbb2 918 return -EOVERFLOW;
8f3f655d 919 }
1da177e4
LT		 920 dirent = buf->previous;
921 if (dirent) {
922 if (__put_user(offset, &dirent->d_off))
923 goto efault;
924 }
925 dirent = buf->current_dir;
afefdbb2 926 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 927 goto efault;
928 if (__put_user(reclen, &dirent->d_reclen))
929 goto efault;
930 if (copy_to_user(dirent->d_name, name, namlen))
931 goto efault;
932 if (__put_user(0, dirent->d_name + namlen))
933 goto efault;
934 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
935 goto efault;
936 buf->previous = dirent;
937 dirent = (void __user *)dirent + reclen;
938 buf->current_dir = dirent;
939 buf->count -= reclen;
940 return 0;
941efault:
942 buf->error = -EFAULT;
943 return -EFAULT;
944}
945
946asmlinkage long compat_sys_getdents(unsigned int fd,
947 struct compat_linux_dirent __user *dirent, unsigned int count)
948{
949 struct file * file;
950 struct compat_linux_dirent __user * lastdirent;
951 struct compat_getdents_callback buf;
952 int error;
953
954 error = -EFAULT;
955 if (!access_ok(VERIFY_WRITE, dirent, count))
956 goto out;
957
958 error = -EBADF;
959 file = fget(fd);
960 if (!file)
961 goto out;
962
963 buf.current_dir = dirent;
964 buf.previous = NULL;
965 buf.count = count;
966 buf.error = 0;
967
968 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 969 if (error >= 0)
970 error = buf.error;
1da177e4
LT		 971 lastdirent = buf.previous;
972 if (lastdirent) {
973 if (put_user(file->f_pos, &lastdirent->d_off))
974 error = -EFAULT;
975 else
976 error = count - buf.count;
977 }
1da177e4
LT		 978 fput(file);
979out:
980 return error;
981}
982
983#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 984
985struct compat_getdents_callback64 {
986 struct linux_dirent64 __user *current_dir;
987 struct linux_dirent64 __user *previous;
988 int count;
989 int error;
990};
991
992static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 993 u64 ino, unsigned int d_type)
1da177e4
LT		 994{
995 struct linux_dirent64 __user *dirent;
996 struct compat_getdents_callback64 *buf = __buf;
997 int jj = NAME_OFFSET(dirent);
022a1692 998 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1da177e4
LT		 999 u64 off;
1000
1001 buf->error = -EINVAL; /* only used if we fail.. */
1002 if (reclen > buf->count)
1003 return -EINVAL;
1004 dirent = buf->previous;
1005
1006 if (dirent) {
1007 if (__put_user_unaligned(offset, &dirent->d_off))
1008 goto efault;
1009 }
1010 dirent = buf->current_dir;
1011 if (__put_user_unaligned(ino, &dirent->d_ino))
1012 goto efault;
1013 off = 0;
1014 if (__put_user_unaligned(off, &dirent->d_off))
1015 goto efault;
1016 if (__put_user(reclen, &dirent->d_reclen))
1017 goto efault;
1018 if (__put_user(d_type, &dirent->d_type))
1019 goto efault;
1020 if (copy_to_user(dirent->d_name, name, namlen))
1021 goto efault;
1022 if (__put_user(0, dirent->d_name + namlen))
1023 goto efault;
1024 buf->previous = dirent;
1025 dirent = (void __user *)dirent + reclen;
1026 buf->current_dir = dirent;
1027 buf->count -= reclen;
1028 return 0;
1029efault:
1030 buf->error = -EFAULT;
1031 return -EFAULT;
1032}
1033
1034asmlinkage long compat_sys_getdents64(unsigned int fd,
1035 struct linux_dirent64 __user * dirent, unsigned int count)
1036{
1037 struct file * file;
1038 struct linux_dirent64 __user * lastdirent;
1039 struct compat_getdents_callback64 buf;
1040 int error;
1041
1042 error = -EFAULT;
1043 if (!access_ok(VERIFY_WRITE, dirent, count))
1044 goto out;
1045
1046 error = -EBADF;
1047 file = fget(fd);
1048 if (!file)
1049 goto out;
1050
1051 buf.current_dir = dirent;
1052 buf.previous = NULL;
1053 buf.count = count;
1054 buf.error = 0;
1055
1056 error = vfs_readdir(file, compat_filldir64, &buf);
53c9c5c0
AV		 1057 if (error >= 0)
1058 error = buf.error;
1da177e4
LT		 1059 lastdirent = buf.previous;
1060 if (lastdirent) {
1061 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1062 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1063 error = -EFAULT;
1064 else
1065 error = count - buf.count;
1da177e4 1066 }
1da177e4
LT		 1067 fput(file);
1068out:
1069 return error;
1070}
1071#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1072
1073static ssize_t compat_do_readv_writev(int type, struct file *file,
1074 const struct compat_iovec __user *uvector,
1075 unsigned long nr_segs, loff_t *pos)
1076{
1da177e4
LT		 1077 compat_ssize_t tot_len;
1078 struct iovec iovstack[UIO_FASTIOV];
1079 struct iovec *iov=iovstack, *vector;
1080 ssize_t ret;
1081 int seg;
1082 io_fn_t fn;
1083 iov_fn_t fnv;
1084
1085 /*
1086 * SuS says "The readv() function *may* fail if the iovcnt argument
1087 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1088 * traditionally returned zero for zero segments, so...
1089 */
1090 ret = 0;
1091 if (nr_segs == 0)
1092 goto out;
1093
1094 /*
1095 * First get the "struct iovec" from user memory and
1096 * verify all the pointers
1097 */
1098 ret = -EINVAL;
1099 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1100 goto out;
1101 if (!file->f_op)
1102 goto out;
1103 if (nr_segs > UIO_FASTIOV) {
1104 ret = -ENOMEM;
1105 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1106 if (!iov)
1107 goto out;
1108 }
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 /*
1114 * Single unix specification:
1115 * We should -EINVAL if an element length is not >= 0 and fitting an
1116 * ssize_t. The total length is fitting an ssize_t
1117 *
1118 * Be careful here because iov_len is a size_t not an ssize_t
1119 */
1120 tot_len = 0;
1121 vector = iov;
1122 ret = -EINVAL;
1123 for (seg = 0 ; seg < nr_segs; seg++) {
1124 compat_ssize_t tmp = tot_len;
1125 compat_ssize_t len;
1126 compat_uptr_t buf;
1127
1128 if (__get_user(len, &uvector->iov_len) ||
1129 __get_user(buf, &uvector->iov_base)) {
1130 ret = -EFAULT;
1131 goto out;
1132 }
1133 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1134 goto out;
1135 tot_len += len;
1136 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1137 goto out;
1138 vector->iov_base = compat_ptr(buf);
1139 vector->iov_len = (compat_size_t) len;
1140 uvector++;
1141 vector++;
1142 }
1143 if (tot_len == 0) {
1144 ret = 0;
1145 goto out;
1146 }
1147
1148 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1149 if (ret < 0)
1da177e4
LT		 1150 goto out;
1151
1152 fnv = NULL;
1153 if (type == READ) {
1154 fn = file->f_op->read;
ee0b3e67 1155 fnv = file->f_op->aio_read;
1da177e4
LT		 1156 } else {
1157 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1158 fnv = file->f_op->aio_write;
1da177e4
LT		 1159 }
1160
ee0b3e67
BP		 1161 if (fnv)
1162 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1163 pos, fnv);
1164 else
1165 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1166
1da177e4
LT		 1167out:
1168 if (iov != iovstack)
1169 kfree(iov);
0eeca283 1170 if ((ret + (type == READ)) > 0) {
0f7fc9e4 1171 struct dentry *dentry = file->f_path.dentry;
0eeca283
RL		 1172 if (type == READ)
1173 fsnotify_access(dentry);
1174 else
1175 fsnotify_modify(dentry);
1176 }
1da177e4
LT		 1177 return ret;
1178}
1179
dac12138
GH		 1180static size_t compat_readv(struct file *file,
1181 const struct compat_iovec __user *vec,
1182 unsigned long vlen, loff_t *pos)
1da177e4 1183{
1da177e4
LT		 1184 ssize_t ret = -EBADF;
1185
1da177e4
LT		 1186 if (!(file->f_mode & FMODE_READ))
1187 goto out;
1188
1189 ret = -EINVAL;
ee0b3e67 1190 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1191 goto out;
1192
dac12138 1193 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1194
1195out:
ca8a5bd2
GH		 1196 if (ret > 0)
1197 add_rchar(current, ret);
1198 inc_syscr(current);
dac12138
GH		 1199 return ret;
1200}
1201
1202asmlinkage ssize_t
1203compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1204 unsigned long vlen)
1205{
1206 struct file *file;
10c7db27 1207 int fput_needed;
dac12138
GH		 1208 ssize_t ret;
1209
10c7db27 1210 file = fget_light(fd, &fput_needed);
dac12138
GH		 1211 if (!file)
1212 return -EBADF;
1213 ret = compat_readv(file, vec, vlen, &file->f_pos);
10c7db27 1214 fput_light(file, fput_needed);
1da177e4
LT		 1215 return ret;
1216}
1217
f3554f4b
GH		 1218asmlinkage ssize_t
1219compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1220 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1221{
1222 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1223 struct file *file;
10c7db27 1224 int fput_needed;
f3554f4b
GH		 1225 ssize_t ret;
1226
1227 if (pos < 0)
1228 return -EINVAL;
10c7db27 1229 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1230 if (!file)
1231 return -EBADF;
1232 ret = compat_readv(file, vec, vlen, &pos);
10c7db27 1233 fput_light(file, fput_needed);
f3554f4b
GH		 1234 return ret;
1235}
1236
6949a631
GH		 1237static size_t compat_writev(struct file *file,
1238 const struct compat_iovec __user *vec,
1239 unsigned long vlen, loff_t *pos)
1da177e4 1240{
1da177e4
LT		 1241 ssize_t ret = -EBADF;
1242
1da177e4
LT		 1243 if (!(file->f_mode & FMODE_WRITE))
1244 goto out;
1245
1246 ret = -EINVAL;
ee0b3e67 1247 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1248 goto out;
1249
6949a631 1250 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1da177e4
LT		 1251
1252out:
ca8a5bd2
GH		 1253 if (ret > 0)
1254 add_wchar(current, ret);
1255 inc_syscw(current);
6949a631
GH		 1256 return ret;
1257}
1258
1259asmlinkage ssize_t
1260compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1261 unsigned long vlen)
1262{
1263 struct file *file;
10c7db27 1264 int fput_needed;
6949a631
GH		 1265 ssize_t ret;
1266
10c7db27 1267 file = fget_light(fd, &fput_needed);
6949a631
GH		 1268 if (!file)
1269 return -EBADF;
1270 ret = compat_writev(file, vec, vlen, &file->f_pos);
10c7db27 1271 fput_light(file, fput_needed);
1da177e4
LT		 1272 return ret;
1273}
1274
f3554f4b
GH		 1275asmlinkage ssize_t
1276compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1277 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1278{
1279 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1280 struct file *file;
10c7db27 1281 int fput_needed;
f3554f4b
GH		 1282 ssize_t ret;
1283
1284 if (pos < 0)
1285 return -EINVAL;
10c7db27 1286 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1287 if (!file)
1288 return -EBADF;
1289 ret = compat_writev(file, vec, vlen, &pos);
10c7db27 1290 fput_light(file, fput_needed);
f3554f4b
GH		 1291 return ret;
1292}
1293
d2610202
AK		 1294asmlinkage long
1295compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1296 unsigned int nr_segs, unsigned int flags)
1297{
1298 unsigned i;
90cbad65 1299 struct iovec __user *iov;
98232d50 1300 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1301 return -EINVAL;
1302 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1303 for (i = 0; i < nr_segs; i++) {
1304 struct compat_iovec v;
1305 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1306 get_user(v.iov_len, &iov32[i].iov_len) ||
1307 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1308 put_user(v.iov_len, &iov[i].iov_len))
1309 return -EFAULT;
1310 }
1311 return sys_vmsplice(fd, iov, nr_segs, flags);
1312}
1313
e922efc3
MS		 1314/*
1315 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1316 * O_LARGEFILE flag.
1317 */
1318asmlinkage long
1319compat_sys_open(const char __user *filename, int flags, int mode)
1320{
5590ff0d
UD		 1321 return do_sys_open(AT_FDCWD, filename, flags, mode);
1322}
1323
1324/*
1325 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1326 * O_LARGEFILE flag.
1327 */
1328asmlinkage long
9ad11ab4 1329compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1330{
1331 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1332}
1333
1da177e4
LT		 1334/*
1335 * compat_count() counts the number of arguments/envelopes. It is basically
1336 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1337 * and envp pointers.
1338 */
1339static int compat_count(compat_uptr_t __user *argv, int max)
1340{
1341 int i = 0;
1342
1343 if (argv != NULL) {
1344 for (;;) {
1345 compat_uptr_t p;
1346
1347 if (get_user(p, argv))
1348 return -EFAULT;
1349 if (!p)
1350 break;
1351 argv++;
362e6663 1352 if (i++ >= max)
1da177e4
LT		 1353 return -E2BIG;
1354 }
1355 }
1356 return i;
1357}
1358
1359/*
1360 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1361 * except that it works with 32 bit argv and envp pointers.
1362 */
1363static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1364 struct linux_binprm *bprm)
1365{
1366 struct page *kmapped_page = NULL;
1367 char *kaddr = NULL;
b6a2fea3 1368 unsigned long kpos = 0;
1da177e4
LT		 1369 int ret;
1370
1371 while (argc-- > 0) {
1372 compat_uptr_t str;
1373 int len;
1374 unsigned long pos;
1375
1376 if (get_user(str, argv+argc) ||
b6a2fea3 1377 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1378 ret = -EFAULT;
1379 goto out;
1380 }
1381
b6a2fea3 1382 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1383 ret = -E2BIG;
1384 goto out;
1385 }
1386
b6a2fea3 1387 /* We're going to work our way backwords. */
1da177e4 1388 pos = bprm->p;
b6a2fea3
OW		 1389 str += len;
1390 bprm->p -= len;
1da177e4
LT		 1391
1392 while (len > 0) {
1da177e4 1393 int offset, bytes_to_copy;
1da177e4
LT		 1394
1395 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1396 if (offset == 0)
1397 offset = PAGE_SIZE;
1398
1399 bytes_to_copy = offset;
1400 if (bytes_to_copy > len)
1401 bytes_to_copy = len;
1402
1403 offset -= bytes_to_copy;
1404 pos -= bytes_to_copy;
1405 str -= bytes_to_copy;
1406 len -= bytes_to_copy;
1407
1408 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1409 struct page *page;
1410
1411#ifdef CONFIG_STACK_GROWSUP
1412 ret = expand_stack_downwards(bprm->vma, pos);
1413 if (ret < 0) {
1414 /* We've exceed the stack rlimit. */
1415 ret = -E2BIG;
1416 goto out;
1417 }
1418#endif
1419 ret = get_user_pages(current, bprm->mm, pos,
1420 1, 1, 1, &page, NULL);
1421 if (ret <= 0) {
1422 /* We've exceed the stack rlimit. */
1423 ret = -E2BIG;
1da177e4
LT		 1424 goto out;
1425 }
1da177e4 1426
b6a2fea3
OW		 1427 if (kmapped_page) {
1428 flush_kernel_dcache_page(kmapped_page);
1da177e4 1429 kunmap(kmapped_page);
b6a2fea3
OW		 1430 put_page(kmapped_page);
1431 }
1da177e4
LT		 1432 kmapped_page = page;
1433 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1434 kpos = pos & PAGE_MASK;
1435 flush_cache_page(bprm->vma, kpos,
1436 page_to_pfn(kmapped_page));
1da177e4 1437 }
b6a2fea3
OW		 1438 if (copy_from_user(kaddr+offset, compat_ptr(str),
1439 bytes_to_copy)) {
1da177e4
LT		 1440 ret = -EFAULT;
1441 goto out;
1442 }
1da177e4
LT		 1443 }
1444 }
1445 ret = 0;
1446out:
b6a2fea3
OW		 1447 if (kmapped_page) {
1448 flush_kernel_dcache_page(kmapped_page);
1da177e4 1449 kunmap(kmapped_page);
b6a2fea3 1450 put_page(kmapped_page);
1da177e4 1451 }
b6a2fea3 1452 return ret;
1da177e4
LT		 1453}
1454
1da177e4
LT		 1455/*
1456 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1457 * that it processes 32 bit argv and envp pointers.
1458 */
1459int compat_do_execve(char * filename,
1460 compat_uptr_t __user *argv,
1461 compat_uptr_t __user *envp,
1462 struct pt_regs * regs)
1463{
1464 struct linux_binprm *bprm;
1465 struct file *file;
53e9309e 1466 struct files_struct *displaced;
8c652f96 1467 bool clear_in_exec;
1da177e4 1468 int retval;
1da177e4 1469
53e9309e
HD		 1470 retval = unshare_files(&displaced);
1471 if (retval)
1472 goto out_ret;
1473
1da177e4 1474 retval = -ENOMEM;
11b0b5ab 1475 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1476 if (!bprm)
53e9309e 1477 goto out_files;
1da177e4 1478
a2a8474c
ON		 1479 retval = prepare_bprm_creds(bprm);
1480 if (retval)
a6f76f23 1481 goto out_free;
498052bb
AV		 1482
1483 retval = check_unsafe_exec(bprm);
8c652f96 1484 if (retval < 0)
a2a8474c 1485 goto out_free;
8c652f96 1486 clear_in_exec = retval;
a2a8474c 1487 current->in_execve = 1;
a6f76f23 1488
1da177e4
LT		 1489 file = open_exec(filename);
1490 retval = PTR_ERR(file);
1491 if (IS_ERR(file))
498052bb 1492 goto out_unmark;
1da177e4
LT		 1493
1494 sched_exec();
1495
1da177e4
LT		 1496 bprm->file = file;
1497 bprm->filename = filename;
1498 bprm->interp = filename;
1da177e4 1499
b6a2fea3
OW		 1500 retval = bprm_mm_init(bprm);
1501 if (retval)
1502 goto out_file;
1da177e4 1503
b6a2fea3 1504 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1505 if ((retval = bprm->argc) < 0)
a6f76f23 1506 goto out;
1da177e4 1507
b6a2fea3 1508 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1509 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1510 goto out;
1511
1512 retval = prepare_binprm(bprm);
1513 if (retval < 0)
1514 goto out;
1515
1516 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1517 if (retval < 0)
1518 goto out;
1519
1520 bprm->exec = bprm->p;
1521 retval = compat_copy_strings(bprm->envc, envp, bprm);
1522 if (retval < 0)
1523 goto out;
1524
1525 retval = compat_copy_strings(bprm->argc, argv, bprm);
1526 if (retval < 0)
1527 goto out;
1528
1529 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1530 if (retval < 0)
1531 goto out;
1da177e4 1532
89240ba0
SS		 1533 current->stack_start = current->mm->start_stack;
1534
a6f76f23 1535 /* execve succeeded */
498052bb 1536 current->fs->in_exec = 0;
f9ce1f1c 1537 current->in_execve = 0;
a6f76f23
DH		 1538 acct_update_integrals(current);
1539 free_bprm(bprm);
53e9309e
HD		 1540 if (displaced)
1541 put_files_struct(displaced);
a6f76f23 1542 return retval;
1da177e4 1543
a6f76f23 1544out:
1da177e4 1545 if (bprm->mm)
b6a2fea3 1546 mmput(bprm->mm);
1da177e4
LT		 1547
1548out_file:
1549 if (bprm->file) {
1550 allow_write_access(bprm->file);
1551 fput(bprm->file);
1552 }
1553
498052bb 1554out_unmark:
8c652f96
ON		 1555 if (clear_in_exec)
1556 current->fs->in_exec = 0;
f9ce1f1c 1557 current->in_execve = 0;
a6f76f23
DH		 1558
1559out_free:
08a6fac1 1560 free_bprm(bprm);
1da177e4 1561
53e9309e
HD		 1562out_files:
1563 if (displaced)
1564 reset_files_struct(displaced);
1da177e4
LT		 1565out_ret:
1566 return retval;
1567}
1568
1569#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1570
b773ad40
TG		 1571static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1572 int timeval, int ret)
1573{
1574 struct timespec ts;
1575
1576 if (!p)
1577 return ret;
1578
1579 if (current->personality & STICKY_TIMEOUTS)
1580 goto sticky;
1581
1582 /* No update for zero timeout */
1583 if (!end_time->tv_sec && !end_time->tv_nsec)
1584 return ret;
1585
1586 ktime_get_ts(&ts);
1587 ts = timespec_sub(*end_time, ts);
1588 if (ts.tv_sec < 0)
1589 ts.tv_sec = ts.tv_nsec = 0;
1590
1591 if (timeval) {
1592 struct compat_timeval rtv;
1593
1594 rtv.tv_sec = ts.tv_sec;
1595 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1596
1597 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1598 return ret;
1599 } else {
1600 struct compat_timespec rts;
1601
1602 rts.tv_sec = ts.tv_sec;
1603 rts.tv_nsec = ts.tv_nsec;
1604
1605 if (!copy_to_user(p, &rts, sizeof(rts)))
1606 return ret;
1607 }
1608 /*
1609 * If an application puts its timeval in read-only memory, we
1610 * don't want the Linux-specific update to the timeval to
1611 * cause a fault after the select has completed
1612 * successfully. However, because we're not updating the
1613 * timeval, we can't restart the system call.
1614 */
1615
1616sticky:
1617 if (ret == -ERESTARTNOHAND)
1618 ret = -EINTR;
1619 return ret;
1620}
1621
1da177e4
LT		 1622/*
1623 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1624 * 64-bit unsigned longs.
1625 */
858119e1 1626static
1da177e4
LT		 1627int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1628 unsigned long *fdset)
1629{
022a1692 1630 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1631 if (ufdset) {
1632 unsigned long odd;
1633
1634 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1635 return -EFAULT;
1636
1637 odd = nr & 1UL;
1638 nr &= ~1UL;
1639 while (nr) {
1640 unsigned long h, l;
7116e994
HC		 1641 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1642 return -EFAULT;
1da177e4
LT		 1643 ufdset += 2;
1644 *fdset++ = h << 32 | l;
1645 nr -= 2;
1646 }
7116e994
HC		 1647 if (odd && __get_user(*fdset, ufdset))
1648 return -EFAULT;
1da177e4
LT		 1649 } else {
1650 /* Tricky, must clear full unsigned long in the
1651 * kernel fdset at the end, this makes sure that
1652 * actually happens.
1653 */
1654 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1655 }
1656 return 0;
1657}
1658
858119e1 1659static
7116e994
HC		 1660int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1661 unsigned long *fdset)
1da177e4
LT		 1662{
1663 unsigned long odd;
022a1692 1664 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1665
1666 if (!ufdset)
7116e994 1667 return 0;
1da177e4
LT		 1668
1669 odd = nr & 1UL;
1670 nr &= ~1UL;
1671 while (nr) {
1672 unsigned long h, l;
1673 l = *fdset++;
1674 h = l >> 32;
7116e994
HC		 1675 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1676 return -EFAULT;
1da177e4
LT		 1677 ufdset += 2;
1678 nr -= 2;
1679 }
7116e994
HC		 1680 if (odd && __put_user(*fdset, ufdset))
1681 return -EFAULT;
1682 return 0;
1da177e4
LT		 1683}
1684
1685
1686/*
1687 * This is a virtual copy of sys_select from fs/select.c and probably
1688 * should be compared to it from time to time
1689 */
1da177e4
LT		 1690
1691/*
1692 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1693 * like to be certain this leads to no problems. So I return
1694 * EINTR just for safety.
1695 *
1696 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1697 * I'm trying ERESTARTNOHAND which restart only when you want to.
1698 */
1699#define MAX_SELECT_SECONDS \
1700 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1701
9f72949f 1702int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1703 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1704 struct timespec *end_time)
1da177e4
LT		 1705{
1706 fd_set_bits fds;
6087b2da 1707 void *bits;
bbea9f69 1708 int size, max_fds, ret = -EINVAL;
a4531edd 1709 struct fdtable *fdt;
6087b2da 1710 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1711
1da177e4
LT		 1712 if (n < 0)
1713 goto out_nofds;
1714
bbea9f69 1715 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1716 rcu_read_lock();
a4531edd 1717 fdt = files_fdtable(current->files);
bbea9f69 1718 max_fds = fdt->max_fds;
ac5b8b6f 1719 rcu_read_unlock();
bbea9f69
VL		 1720 if (n > max_fds)
1721 n = max_fds;
1da177e4
LT		 1722
1723 /*
1724 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1725 * since we used fdset we need to allocate memory in units of
1726 * long-words.
1727 */
1da177e4 1728 size = FDS_BYTES(n);
6087b2da
BP		 1729 bits = stack_fds;
1730 if (size > sizeof(stack_fds) / 6) {
1731 bits = kmalloc(6 * size, GFP_KERNEL);
1732 ret = -ENOMEM;
1733 if (!bits)
1734 goto out_nofds;
1735 }
1da177e4
LT		 1736 fds.in = (unsigned long *) bits;
1737 fds.out = (unsigned long *) (bits + size);
1738 fds.ex = (unsigned long *) (bits + 2*size);
1739 fds.res_in = (unsigned long *) (bits + 3*size);
1740 fds.res_out = (unsigned long *) (bits + 4*size);
1741 fds.res_ex = (unsigned long *) (bits + 5*size);
1742
1743 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1744 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1745 (ret = compat_get_fd_set(n, exp, fds.ex)))
1746 goto out;
1747 zero_fd_set(n, fds.res_in);
1748 zero_fd_set(n, fds.res_out);
1749 zero_fd_set(n, fds.res_ex);
1750
8ff3e8e8 1751 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1752
1753 if (ret < 0)
1754 goto out;
1755 if (!ret) {
1756 ret = -ERESTARTNOHAND;
1757 if (signal_pending(current))
1758 goto out;
1759 ret = 0;
1760 }
1761
7116e994
HC		 1762 if (compat_set_fd_set(n, inp, fds.res_in) ||
1763 compat_set_fd_set(n, outp, fds.res_out) ||
1764 compat_set_fd_set(n, exp, fds.res_ex))
1765 ret = -EFAULT;
1da177e4 1766out:
6087b2da
BP		 1767 if (bits != stack_fds)
1768 kfree(bits);
1da177e4
LT		 1769out_nofds:
1770 return ret;
1771}
1772
9f72949f
DW		 1773asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1774 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1775 struct compat_timeval __user *tvp)
1776{
8ff3e8e8 1777 struct timespec end_time, *to = NULL;
9f72949f
DW		 1778 struct compat_timeval tv;
1779 int ret;
1780
1781 if (tvp) {
1782 if (copy_from_user(&tv, tvp, sizeof(tv)))
1783 return -EFAULT;
1784
8ff3e8e8 1785 to = &end_time;
4d36a9e6
AV		 1786 if (poll_select_set_timeout(to,
1787 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1788 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1789 return -EINVAL;
9f72949f
DW		 1790 }
1791
8ff3e8e8
AV		 1792 ret = compat_core_sys_select(n, inp, outp, exp, to);
1793 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1794
1795 return ret;
1796}
1797
f3de272b 1798#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1799static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1800 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1801 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1802 compat_size_t sigsetsize)
1803{
1804 compat_sigset_t ss32;
1805 sigset_t ksigmask, sigsaved;
9f72949f 1806 struct compat_timespec ts;
8ff3e8e8 1807 struct timespec end_time, *to = NULL;
9f72949f
DW		 1808 int ret;
1809
1810 if (tsp) {
1811 if (copy_from_user(&ts, tsp, sizeof(ts)))
1812 return -EFAULT;
1813
8ff3e8e8
AV		 1814 to = &end_time;
1815 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1816 return -EINVAL;
1817 }
1818
1819 if (sigmask) {
1820 if (sigsetsize != sizeof(compat_sigset_t))
1821 return -EINVAL;
1822 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1823 return -EFAULT;
1824 sigset_from_compat(&ksigmask, &ss32);
1825
1826 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1827 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1828 }
1829
8ff3e8e8
AV		 1830 ret = compat_core_sys_select(n, inp, outp, exp, to);
1831 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1832
1833 if (ret == -ERESTARTNOHAND) {
1834 /*
1835 * Don't restore the signal mask yet. Let do_signal() deliver
1836 * the signal on the way back to userspace, before the signal
1837 * mask is restored.
1838 */
1839 if (sigmask) {
1840 memcpy(&current->saved_sigmask, &sigsaved,
1841 sizeof(sigsaved));
4e4c22c7 1842 set_restore_sigmask();
9f72949f
DW		 1843 }
1844 } else if (sigmask)
1845 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1846
1847 return ret;
1848}
1849
1850asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1851 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1852 struct compat_timespec __user *tsp, void __user *sig)
1853{
1854 compat_size_t sigsetsize = 0;
1855 compat_uptr_t up = 0;
1856
1857 if (sig) {
1858 if (!access_ok(VERIFY_READ, sig,
1859 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1860 __get_user(up, (compat_uptr_t __user *)sig) ||
1861 __get_user(sigsetsize,
1862 (compat_size_t __user *)(sig+sizeof(up))))
1863 return -EFAULT;
1864 }
c9da9f21
HC		 1865 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1866 sigsetsize);
9f72949f
DW		 1867}
1868
1869asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1870 unsigned int nfds, struct compat_timespec __user *tsp,
1871 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1872{
1873 compat_sigset_t ss32;
1874 sigset_t ksigmask, sigsaved;
1875 struct compat_timespec ts;
8ff3e8e8 1876 struct timespec end_time, *to = NULL;
9f72949f
DW		 1877 int ret;
1878
1879 if (tsp) {
1880 if (copy_from_user(&ts, tsp, sizeof(ts)))
1881 return -EFAULT;
1882
8ff3e8e8
AV		 1883 to = &end_time;
1884 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1885 return -EINVAL;
9f72949f
DW		 1886 }
1887
1888 if (sigmask) {
3835a9bd 1889 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1890 return -EINVAL;
1891 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1892 return -EFAULT;
1893 sigset_from_compat(&ksigmask, &ss32);
1894
1895 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1896 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1897 }
1898
8ff3e8e8 1899 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1900
1901 /* We can restart this syscall, usually */
1902 if (ret == -EINTR) {
1903 /*
1904 * Don't restore the signal mask yet. Let do_signal() deliver
1905 * the signal on the way back to userspace, before the signal
1906 * mask is restored.
1907 */
1908 if (sigmask) {
1909 memcpy(&current->saved_sigmask, &sigsaved,
1910 sizeof(sigsaved));
4e4c22c7 1911 set_restore_sigmask();
9f72949f
DW		 1912 }
1913 ret = -ERESTARTNOHAND;
1914 } else if (sigmask)
1915 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1916
8ff3e8e8 1917 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1918
1919 return ret;
1920}
f3de272b 1921#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1922
1da177e4
LT		 1923#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1924/* Stuff for NFS server syscalls... */
1925struct compat_nfsctl_svc {
1926 u16 svc32_port;
1927 s32 svc32_nthreads;
1928};
1929
1930struct compat_nfsctl_client {
1931 s8 cl32_ident[NFSCLNT_IDMAX+1];
1932 s32 cl32_naddr;
1933 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1934 s32 cl32_fhkeytype;
1935 s32 cl32_fhkeylen;
1936 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1937};
1938
1939struct compat_nfsctl_export {
1940 char ex32_client[NFSCLNT_IDMAX+1];
1941 char ex32_path[NFS_MAXPATHLEN+1];
1942 compat_dev_t ex32_dev;
1943 compat_ino_t ex32_ino;
1944 compat_int_t ex32_flags;
202e5979
SR		 1945 __compat_uid_t ex32_anon_uid;
1946 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1947};
1948
1949struct compat_nfsctl_fdparm {
1950 struct sockaddr gd32_addr;
1951 s8 gd32_path[NFS_MAXPATHLEN+1];
1952 compat_int_t gd32_version;
1953};
1954
1955struct compat_nfsctl_fsparm {
1956 struct sockaddr gd32_addr;
1957 s8 gd32_path[NFS_MAXPATHLEN+1];
1958 compat_int_t gd32_maxlen;
1959};
1960
1961struct compat_nfsctl_arg {
1962 compat_int_t ca32_version; /* safeguard */
1963 union {
1964 struct compat_nfsctl_svc u32_svc;
1965 struct compat_nfsctl_client u32_client;
1966 struct compat_nfsctl_export u32_export;
1967 struct compat_nfsctl_fdparm u32_getfd;
1968 struct compat_nfsctl_fsparm u32_getfs;
1969 } u;
1970#define ca32_svc u.u32_svc
1971#define ca32_client u.u32_client
1972#define ca32_export u.u32_export
1973#define ca32_getfd u.u32_getfd
1974#define ca32_getfs u.u32_getfs
1975};
1976
1977union compat_nfsctl_res {
1978 __u8 cr32_getfh[NFS_FHSIZE];
1979 struct knfsd_fh cr32_getfs;
1980};
1981
d64b1c87
LFS		 1982static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1983 struct compat_nfsctl_arg __user *arg)
1da177e4 1984{
d64b1c87
LFS		 1985 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1986 get_user(karg->ca_version, &arg->ca32_version) ||
1987 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1988 __get_user(karg->ca_svc.svc_nthreads,
1989 &arg->ca32_svc.svc32_nthreads))
1990 return -EFAULT;
1991 return 0;
1da177e4
LT		 1992}
1993
d64b1c87
LFS		 1994static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1995 struct compat_nfsctl_arg __user *arg)
1da177e4 1996{
d64b1c87
LFS		 1997 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1998 sizeof(arg->ca32_client)) ||
1999 get_user(karg->ca_version, &arg->ca32_version) ||
2000 __copy_from_user(&karg->ca_client.cl_ident[0],
2001 &arg->ca32_client.cl32_ident[0],
2002 NFSCLNT_IDMAX) ||
2003 __get_user(karg->ca_client.cl_naddr,
2004 &arg->ca32_client.cl32_naddr) ||
2005 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2006 &arg->ca32_client.cl32_addrlist[0],
2007 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2008 __get_user(karg->ca_client.cl_fhkeytype,
2009 &arg->ca32_client.cl32_fhkeytype) ||
2010 __get_user(karg->ca_client.cl_fhkeylen,
2011 &arg->ca32_client.cl32_fhkeylen) ||
2012 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2013 &arg->ca32_client.cl32_fhkey[0],
2014 NFSCLNT_KEYMAX))
2015 return -EFAULT;
1da177e4 2016
d64b1c87 2017 return 0;
1da177e4
LT		 2018}
2019
d64b1c87
LFS		 2020static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2021 struct compat_nfsctl_arg __user *arg)
1da177e4 2022{
d64b1c87
LFS		 2023 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2024 sizeof(arg->ca32_export)) ||
2025 get_user(karg->ca_version, &arg->ca32_version) ||
2026 __copy_from_user(&karg->ca_export.ex_client[0],
2027 &arg->ca32_export.ex32_client[0],
2028 NFSCLNT_IDMAX) ||
2029 __copy_from_user(&karg->ca_export.ex_path[0],
2030 &arg->ca32_export.ex32_path[0],
2031 NFS_MAXPATHLEN) ||
2032 __get_user(karg->ca_export.ex_dev,
2033 &arg->ca32_export.ex32_dev) ||
2034 __get_user(karg->ca_export.ex_ino,
2035 &arg->ca32_export.ex32_ino) ||
2036 __get_user(karg->ca_export.ex_flags,
2037 &arg->ca32_export.ex32_flags) ||
2038 __get_user(karg->ca_export.ex_anon_uid,
2039 &arg->ca32_export.ex32_anon_uid) ||
2040 __get_user(karg->ca_export.ex_anon_gid,
2041 &arg->ca32_export.ex32_anon_gid))
2042 return -EFAULT;
1da177e4
LT		 2043 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2044 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2045
d64b1c87 2046 return 0;
1da177e4
LT		 2047}
2048
d64b1c87
LFS		 2049static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2050 struct compat_nfsctl_arg __user *arg)
1da177e4 2051{
d64b1c87
LFS		 2052 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2053 sizeof(arg->ca32_getfd)) ||
2054 get_user(karg->ca_version, &arg->ca32_version) ||
2055 __copy_from_user(&karg->ca_getfd.gd_addr,
2056 &arg->ca32_getfd.gd32_addr,
2057 (sizeof(struct sockaddr))) ||
2058 __copy_from_user(&karg->ca_getfd.gd_path,
2059 &arg->ca32_getfd.gd32_path,
2060 (NFS_MAXPATHLEN+1)) ||
2061 __get_user(karg->ca_getfd.gd_version,
2062 &arg->ca32_getfd.gd32_version))
2063 return -EFAULT;
1da177e4 2064
d64b1c87 2065 return 0;
1da177e4
LT		 2066}
2067
d64b1c87
LFS		 2068static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2069 struct compat_nfsctl_arg __user *arg)
1da177e4 2070{
d64b1c87
LFS		 2071 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2072 get_user(karg->ca_version, &arg->ca32_version) ||
2073 __copy_from_user(&karg->ca_getfs.gd_addr,
2074 &arg->ca32_getfs.gd32_addr,
2075 (sizeof(struct sockaddr))) ||
2076 __copy_from_user(&karg->ca_getfs.gd_path,
2077 &arg->ca32_getfs.gd32_path,
2078 (NFS_MAXPATHLEN+1)) ||
2079 __get_user(karg->ca_getfs.gd_maxlen,
2080 &arg->ca32_getfs.gd32_maxlen))
2081 return -EFAULT;
1da177e4 2082
d64b1c87 2083 return 0;
1da177e4
LT		 2084}
2085
2086/* This really doesn't need translations, we are only passing
2087 * back a union which contains opaque nfs file handle data.
2088 */
d64b1c87
LFS		 2089static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2090 union compat_nfsctl_res __user *res)
1da177e4
LT		 2091{
2092 int err;
2093
2094 err = copy_to_user(res, kres, sizeof(*res));
2095
2096 return (err) ? -EFAULT : 0;
2097}
2098
d64b1c87
LFS		 2099asmlinkage long compat_sys_nfsservctl(int cmd,
2100 struct compat_nfsctl_arg __user *arg,
2101 union compat_nfsctl_res __user *res)
1da177e4
LT		 2102{
2103 struct nfsctl_arg *karg;
2104 union nfsctl_res *kres;
2105 mm_segment_t oldfs;
2106 int err;
2107
2108 karg = kmalloc(sizeof(*karg), GFP_USER);
2109 kres = kmalloc(sizeof(*kres), GFP_USER);
2110 if(!karg || !kres) {
2111 err = -ENOMEM;
2112 goto done;
2113 }
2114
2115 switch(cmd) {
2116 case NFSCTL_SVC:
2117 err = compat_nfs_svc_trans(karg, arg);
2118 break;
2119
2120 case NFSCTL_ADDCLIENT:
2121 err = compat_nfs_clnt_trans(karg, arg);
2122 break;
2123
2124 case NFSCTL_DELCLIENT:
2125 err = compat_nfs_clnt_trans(karg, arg);
2126 break;
2127
2128 case NFSCTL_EXPORT:
2129 case NFSCTL_UNEXPORT:
2130 err = compat_nfs_exp_trans(karg, arg);
2131 break;
2132
2133 case NFSCTL_GETFD:
2134 err = compat_nfs_getfd_trans(karg, arg);
2135 break;
2136
2137 case NFSCTL_GETFS:
2138 err = compat_nfs_getfs_trans(karg, arg);
2139 break;
2140
2141 default:
2142 err = -EINVAL;
57070d01 2143 break;
1da177e4
LT		 2144 }
2145
57070d01
PS		 2146 if (err)
2147 goto done;
2148
1da177e4
LT		 2149 oldfs = get_fs();
2150 set_fs(KERNEL_DS);
2151 /* The __user pointer casts are valid because of the set_fs() */
2152 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2153 set_fs(oldfs);
2154
2155 if (err)
2156 goto done;
2157
2158 if((cmd == NFSCTL_GETFD) ||
2159 (cmd == NFSCTL_GETFS))
2160 err = compat_nfs_getfh_res_trans(kres, res);
2161
2162done:
2163 kfree(karg);
2164 kfree(kres);
2165 return err;
2166}
2167#else /* !NFSD */
2168long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2169{
2170 return sys_ni_syscall();
2171}
2172#endif
f6dfb4fd
DL		 2173
2174#ifdef CONFIG_EPOLL
2175
f3de272b 2176#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2177asmlinkage long compat_sys_epoll_pwait(int epfd,
2178 struct compat_epoll_event __user *events,
2179 int maxevents, int timeout,
2180 const compat_sigset_t __user *sigmask,
2181 compat_size_t sigsetsize)
2182{
2183 long err;
2184 compat_sigset_t csigmask;
2185 sigset_t ksigmask, sigsaved;
2186
2187 /*
2188 * If the caller wants a certain signal mask to be set during the wait,
2189 * we apply it here.
2190 */
2191 if (sigmask) {
2192 if (sigsetsize != sizeof(compat_sigset_t))
2193 return -EINVAL;
2194 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2195 return -EFAULT;
2196 sigset_from_compat(&ksigmask, &csigmask);
2197 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2198 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2199 }
2200
f6dfb4fd 2201 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2202
2203 /*
2204 * If we changed the signal mask, we need to restore the original one.
2205 * In case we've got a signal while waiting, we do not restore the
2206 * signal mask yet, and we allow do_signal() to deliver the signal on
2207 * the way back to userspace, before the signal mask is restored.
2208 */
2209 if (sigmask) {
2210 if (err == -EINTR) {
2211 memcpy(&current->saved_sigmask, &sigsaved,
2212 sizeof(sigsaved));
4e4c22c7 2213 set_restore_sigmask();
f6dfb4fd
DL		 2214 } else
2215 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2216 }
2217
2218 return err;
2219}
f3de272b 2220#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2221
2222#endif /* CONFIG_EPOLL */
6d18c922
DL		 2223
2224#ifdef CONFIG_SIGNALFD
2225
9deb27ba
UD		 2226asmlinkage long compat_sys_signalfd4(int ufd,
2227 const compat_sigset_t __user *sigmask,
2228 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2229{
2230 compat_sigset_t ss32;
2231 sigset_t tmp;
2232 sigset_t __user *ksigmask;
2233
2234 if (sigsetsize != sizeof(compat_sigset_t))
2235 return -EINVAL;
2236 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2237 return -EFAULT;
2238 sigset_from_compat(&tmp, &ss32);
2239 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2240 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2241 return -EFAULT;
2242
9deb27ba 2243 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2244}
2245
9deb27ba
UD		 2246asmlinkage long compat_sys_signalfd(int ufd,
2247 const compat_sigset_t __user *sigmask,
2248 compat_size_t sigsetsize)
2249{
2250 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2251}
6d18c922
DL		 2252#endif /* CONFIG_SIGNALFD */
2253
83f5d126
DL		 2254#ifdef CONFIG_TIMERFD
2255
4d672e7a
DL		 2256asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2257 const struct compat_itimerspec __user *utmr,
2258 struct compat_itimerspec __user *otmr)
83f5d126 2259{
4d672e7a 2260 int error;
83f5d126
DL		 2261 struct itimerspec t;
2262 struct itimerspec __user *ut;
2263
83f5d126 2264 if (get_compat_itimerspec(&t, utmr))
8317f14b 2265 return -EFAULT;
4d672e7a
DL		 2266 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2267 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2268 return -EFAULT;
4d672e7a
DL		 2269 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2270 if (!error && otmr)
2271 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2272 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2273
2274 return error;
2275}
2276
2277asmlinkage long compat_sys_timerfd_gettime(int ufd,
2278 struct compat_itimerspec __user *otmr)
2279{
2280 int error;
2281 struct itimerspec t;
2282 struct itimerspec __user *ut;
83f5d126 2283
4d672e7a
DL		 2284 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2285 error = sys_timerfd_gettime(ufd, ut);
2286 if (!error)
2287 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2288 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2289
2290 return error;
83f5d126
DL		 2291}
2292
2293#endif /* CONFIG_TIMERFD */
Clone of davem's net-next-2.6 tree