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fsnotify: pass a file instead of an inode to open, read, and write
[mirror_ubuntu-artful-kernel.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>
5a0e3ad6 52#include <linux/slab.h>
1da177e4 53
1da177e4
LT		 54#include <asm/uaccess.h>
55#include <asm/mmu_context.h>
56#include <asm/ioctls.h>
07f3f05c 57#include "internal.h"
9f72949f 58
bebfa101
AK		 59int compat_log = 1;
60
61int compat_printk(const char *fmt, ...)
62{
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71}
72
ee0b3e67
BP		 73#include "read_write.h"
74
1da177e4
LT		 75/*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
80{
1c710c89 81 struct timespec tv[2];
1da177e4
LT		 82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
1c710c89
UD		 87 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
1da177e4 89 }
1c710c89
UD		 90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91}
92
93asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
94{
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
1c710c89
UD		 102 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103 return 0;
104 }
105 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 106}
107
9ad11ab4 108asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4 109{
1c710c89 110 struct timespec tv[2];
1da177e4 111
9ad11ab4 112 if (t) {
1da177e4 113 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 114 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 115 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 116 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 117 return -EFAULT;
1c710c89
UD		 118 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120 return -EINVAL;
121 tv[0].tv_nsec *= 1000;
122 tv[1].tv_nsec *= 1000;
9ad11ab4 123 }
1c710c89 124 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 125}
126
127asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
128{
129 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 130}
131
f7a5000f
CH		 132static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133{
134 compat_ino_t ino = stat->ino;
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 int err;
138
139 SET_UID(uid, stat->uid);
140 SET_GID(gid, stat->gid);
141
142 if ((u64) stat->size > MAX_NON_LFS ||
143 !old_valid_dev(stat->dev) ||
144 !old_valid_dev(stat->rdev))
145 return -EOVERFLOW;
146 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147 return -EOVERFLOW;
148
149 if (clear_user(ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153 err |= __put_user(ino, &ubuf->st_ino);
154 err |= __put_user(stat->mode, &ubuf->st_mode);
155 err |= __put_user(stat->nlink, &ubuf->st_nlink);
156 err |= __put_user(uid, &ubuf->st_uid);
157 err |= __put_user(gid, &ubuf->st_gid);
158 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159 err |= __put_user(stat->size, &ubuf->st_size);
160 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166 err |= __put_user(stat->blksize, &ubuf->st_blksize);
167 err |= __put_user(stat->blocks, &ubuf->st_blocks);
168 return err;
169}
170
1da177e4
LT		 171asmlinkage long compat_sys_newstat(char __user * filename,
172 struct compat_stat __user *statbuf)
173{
174 struct kstat stat;
2eae7a18 175 int error;
1da177e4 176
2eae7a18
CH		 177 error = vfs_stat(filename, &stat);
178 if (error)
179 return error;
180 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 181}
182
183asmlinkage long compat_sys_newlstat(char __user * filename,
184 struct compat_stat __user *statbuf)
185{
186 struct kstat stat;
2eae7a18 187 int error;
1da177e4 188
2eae7a18
CH		 189 error = vfs_lstat(filename, &stat);
190 if (error)
191 return error;
192 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 193}
194
82d821dd 195#ifndef __ARCH_WANT_STAT64
9ad11ab4 196asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
5590ff0d
UD		 197 struct compat_stat __user *statbuf, int flag)
198{
199 struct kstat stat;
0112fc22 200 int error;
5590ff0d 201
0112fc22
OD		 202 error = vfs_fstatat(dfd, filename, &stat, flag);
203 if (error)
204 return error;
205 return cp_compat_stat(&stat, statbuf);
5590ff0d 206}
82d821dd 207#endif
5590ff0d 208
1da177e4
LT		 209asmlinkage long compat_sys_newfstat(unsigned int fd,
210 struct compat_stat __user * statbuf)
211{
212 struct kstat stat;
213 int error = vfs_fstat(fd, &stat);
214
215 if (!error)
216 error = cp_compat_stat(&stat, statbuf);
217 return error;
218}
219
220static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
221{
222
223 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 224 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
225 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 226 return -EOVERFLOW;
227 /* f_files and f_ffree may be -1; it's okay
228 * to stuff that into 32 bits */
229 if (kbuf->f_files != 0xffffffffffffffffULL
230 && (kbuf->f_files & 0xffffffff00000000ULL))
231 return -EOVERFLOW;
232 if (kbuf->f_ffree != 0xffffffffffffffffULL
233 && (kbuf->f_ffree & 0xffffffff00000000ULL))
234 return -EOVERFLOW;
235 }
236 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
237 __put_user(kbuf->f_type, &ubuf->f_type) ||
238 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
239 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
240 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
241 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
242 __put_user(kbuf->f_files, &ubuf->f_files) ||
243 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
244 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
245 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
246 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
247 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
248 __put_user(0, &ubuf->f_spare[0]) ||
249 __put_user(0, &ubuf->f_spare[1]) ||
250 __put_user(0, &ubuf->f_spare[2]) ||
251 __put_user(0, &ubuf->f_spare[3]) ||
252 __put_user(0, &ubuf->f_spare[4]))
253 return -EFAULT;
254 return 0;
255}
256
257/*
258 * The following statfs calls are copies of code from fs/open.c and
259 * should be checked against those from time to time
260 */
2d8f3038 261asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 262{
2d8f3038 263 struct path path;
1da177e4
LT		 264 int error;
265
2d8f3038 266 error = user_path(pathname, &path);
1da177e4
LT		 267 if (!error) {
268 struct kstatfs tmp;
2d8f3038 269 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 270 if (!error)
271 error = put_compat_statfs(buf, &tmp);
2d8f3038 272 path_put(&path);
1da177e4
LT		 273 }
274 return error;
275}
276
277asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
278{
279 struct file * file;
280 struct kstatfs tmp;
281 int error;
282
283 error = -EBADF;
284 file = fget(fd);
285 if (!file)
286 goto out;
0f7fc9e4 287 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 288 if (!error)
289 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 290 fput(file);
291out:
292 return error;
293}
294
295static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
296{
297 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 298 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
299 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 300 return -EOVERFLOW;
301 /* f_files and f_ffree may be -1; it's okay
302 * to stuff that into 32 bits */
303 if (kbuf->f_files != 0xffffffffffffffffULL
304 && (kbuf->f_files & 0xffffffff00000000ULL))
305 return -EOVERFLOW;
306 if (kbuf->f_ffree != 0xffffffffffffffffULL
307 && (kbuf->f_ffree & 0xffffffff00000000ULL))
308 return -EOVERFLOW;
309 }
310 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
311 __put_user(kbuf->f_type, &ubuf->f_type) ||
312 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
313 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
314 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
315 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
316 __put_user(kbuf->f_files, &ubuf->f_files) ||
317 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
318 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
319 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
320 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
321 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
322 return -EFAULT;
323 return 0;
324}
325
2d8f3038 326asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 327{
2d8f3038 328 struct path path;
1da177e4
LT		 329 int error;
330
331 if (sz != sizeof(*buf))
332 return -EINVAL;
333
2d8f3038 334 error = user_path(pathname, &path);
1da177e4
LT		 335 if (!error) {
336 struct kstatfs tmp;
2d8f3038 337 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 338 if (!error)
339 error = put_compat_statfs64(buf, &tmp);
2d8f3038 340 path_put(&path);
1da177e4
LT		 341 }
342 return error;
343}
344
345asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
346{
347 struct file * file;
348 struct kstatfs tmp;
349 int error;
350
351 if (sz != sizeof(*buf))
352 return -EINVAL;
353
354 error = -EBADF;
355 file = fget(fd);
356 if (!file)
357 goto out;
0f7fc9e4 358 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 359 if (!error)
360 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 361 fput(file);
362out:
363 return error;
364}
365
2b1c6bd7
CH		 366/*
367 * This is a copy of sys_ustat, just dealing with a structure layout.
368 * Given how simple this syscall is that apporach is more maintainable
369 * than the various conversion hacks.
370 */
371asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
372{
373 struct super_block *sb;
374 struct compat_ustat tmp;
375 struct kstatfs sbuf;
376 int err;
377
378 sb = user_get_super(new_decode_dev(dev));
379 if (!sb)
380 return -EINVAL;
381 err = vfs_statfs(sb->s_root, &sbuf);
382 drop_super(sb);
383 if (err)
384 return err;
385
386 memset(&tmp, 0, sizeof(struct compat_ustat));
387 tmp.f_tfree = sbuf.f_bfree;
388 tmp.f_tinode = sbuf.f_ffree;
389 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
390 return -EFAULT;
391 return 0;
392}
393
1da177e4
LT		 394static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
395{
396 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
397 __get_user(kfl->l_type, &ufl->l_type) ||
398 __get_user(kfl->l_whence, &ufl->l_whence) ||
399 __get_user(kfl->l_start, &ufl->l_start) ||
400 __get_user(kfl->l_len, &ufl->l_len) ||
401 __get_user(kfl->l_pid, &ufl->l_pid))
402 return -EFAULT;
403 return 0;
404}
405
406static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
407{
408 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
409 __put_user(kfl->l_type, &ufl->l_type) ||
410 __put_user(kfl->l_whence, &ufl->l_whence) ||
411 __put_user(kfl->l_start, &ufl->l_start) ||
412 __put_user(kfl->l_len, &ufl->l_len) ||
413 __put_user(kfl->l_pid, &ufl->l_pid))
414 return -EFAULT;
415 return 0;
416}
417
418#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
419static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
420{
421 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
422 __get_user(kfl->l_type, &ufl->l_type) ||
423 __get_user(kfl->l_whence, &ufl->l_whence) ||
424 __get_user(kfl->l_start, &ufl->l_start) ||
425 __get_user(kfl->l_len, &ufl->l_len) ||
426 __get_user(kfl->l_pid, &ufl->l_pid))
427 return -EFAULT;
428 return 0;
429}
430#endif
431
432#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
433static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
434{
435 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
436 __put_user(kfl->l_type, &ufl->l_type) ||
437 __put_user(kfl->l_whence, &ufl->l_whence) ||
438 __put_user(kfl->l_start, &ufl->l_start) ||
439 __put_user(kfl->l_len, &ufl->l_len) ||
440 __put_user(kfl->l_pid, &ufl->l_pid))
441 return -EFAULT;
442 return 0;
443}
444#endif
445
446asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
447 unsigned long arg)
448{
449 mm_segment_t old_fs;
450 struct flock f;
451 long ret;
452
453 switch (cmd) {
454 case F_GETLK:
455 case F_SETLK:
456 case F_SETLKW:
457 ret = get_compat_flock(&f, compat_ptr(arg));
458 if (ret != 0)
459 break;
460 old_fs = get_fs();
461 set_fs(KERNEL_DS);
462 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
463 set_fs(old_fs);
464 if (cmd == F_GETLK && ret == 0) {
ff677f8d 465 /* GETLK was successful and we need to return the data...
2520f14c
N		 466 * but it needs to fit in the compat structure.
467 * l_start shouldn't be too big, unless the original
468 * start + end is greater than COMPAT_OFF_T_MAX, in which
469 * case the app was asking for trouble, so we return
470 * -EOVERFLOW in that case.
471 * l_len could be too big, in which case we just truncate it,
472 * and only allow the app to see that part of the conflicting
473 * lock that might make sense to it anyway
474 */
475
476 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 477 ret = -EOVERFLOW;
2520f14c
N		 478 if (f.l_len > COMPAT_OFF_T_MAX)
479 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 480 if (ret == 0)
481 ret = put_compat_flock(&f, compat_ptr(arg));
482 }
483 break;
484
485 case F_GETLK64:
486 case F_SETLK64:
487 case F_SETLKW64:
488 ret = get_compat_flock64(&f, compat_ptr(arg));
489 if (ret != 0)
490 break;
491 old_fs = get_fs();
492 set_fs(KERNEL_DS);
493 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
494 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
495 (unsigned long)&f);
496 set_fs(old_fs);
497 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 498 /* need to return lock information - see above for commentary */
499 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 500 ret = -EOVERFLOW;
2520f14c
N		 501 if (f.l_len > COMPAT_LOFF_T_MAX)
502 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 503 if (ret == 0)
504 ret = put_compat_flock64(&f, compat_ptr(arg));
505 }
506 break;
507
508 default:
509 ret = sys_fcntl(fd, cmd, arg);
510 break;
511 }
512 return ret;
513}
514
515asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
516 unsigned long arg)
517{
518 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
519 return -EINVAL;
520 return compat_sys_fcntl64(fd, cmd, arg);
521}
522
523asmlinkage long
524compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
525{
526 long ret;
527 aio_context_t ctx64;
528
529 mm_segment_t oldfs = get_fs();
530 if (unlikely(get_user(ctx64, ctx32p)))
531 return -EFAULT;
532
533 set_fs(KERNEL_DS);
534 /* The __user pointer cast is valid because of the set_fs() */
535 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
536 set_fs(oldfs);
537 /* truncating is ok because it's a user address */
538 if (!ret)
539 ret = put_user((u32) ctx64, ctx32p);
540 return ret;
541}
542
543asmlinkage long
544compat_sys_io_getevents(aio_context_t ctx_id,
545 unsigned long min_nr,
546 unsigned long nr,
547 struct io_event __user *events,
548 struct compat_timespec __user *timeout)
549{
550 long ret;
551 struct timespec t;
552 struct timespec __user *ut = NULL;
553
554 ret = -EFAULT;
555 if (unlikely(!access_ok(VERIFY_WRITE, events,
556 nr * sizeof(struct io_event))))
557 goto out;
558 if (timeout) {
559 if (get_compat_timespec(&t, timeout))
560 goto out;
561
562 ut = compat_alloc_user_space(sizeof(*ut));
563 if (copy_to_user(ut, &t, sizeof(t)) )
564 goto out;
565 }
566 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
567out:
568 return ret;
569}
570
b8373363
JM		 571/* A write operation does a read from user space and vice versa */
572#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
573
574ssize_t compat_rw_copy_check_uvector(int type,
575 const struct compat_iovec __user *uvector, unsigned long nr_segs,
576 unsigned long fast_segs, struct iovec *fast_pointer,
577 struct iovec **ret_pointer)
578{
579 compat_ssize_t tot_len;
580 struct iovec *iov = *ret_pointer = fast_pointer;
581 ssize_t ret = 0;
582 int seg;
583
584 /*
585 * SuS says "The readv() function *may* fail if the iovcnt argument
586 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
587 * traditionally returned zero for zero segments, so...
588 */
589 if (nr_segs == 0)
590 goto out;
591
592 ret = -EINVAL;
593 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
594 goto out;
595 if (nr_segs > fast_segs) {
596 ret = -ENOMEM;
597 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
598 if (iov == NULL) {
599 *ret_pointer = fast_pointer;
600 goto out;
601 }
602 }
603 *ret_pointer = iov;
604
605 /*
606 * Single unix specification:
607 * We should -EINVAL if an element length is not >= 0 and fitting an
608 * ssize_t. The total length is fitting an ssize_t
609 *
610 * Be careful here because iov_len is a size_t not an ssize_t
611 */
612 tot_len = 0;
613 ret = -EINVAL;
614 for (seg = 0; seg < nr_segs; seg++) {
615 compat_ssize_t tmp = tot_len;
616 compat_uptr_t buf;
617 compat_ssize_t len;
618
619 if (__get_user(len, &uvector->iov_len) ||
620 __get_user(buf, &uvector->iov_base)) {
621 ret = -EFAULT;
622 goto out;
623 }
624 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
625 goto out;
626 tot_len += len;
627 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
628 goto out;
7cbe1770 629 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
b8373363
JM		 630 ret = -EFAULT;
631 goto out;
632 }
633 iov->iov_base = compat_ptr(buf);
634 iov->iov_len = (compat_size_t) len;
635 uvector++;
636 iov++;
637 }
638 ret = tot_len;
639
640out:
641 return ret;
642}
643
1da177e4
LT		 644static inline long
645copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
646{
647 compat_uptr_t uptr;
648 int i;
649
650 for (i = 0; i < nr; ++i) {
651 if (get_user(uptr, ptr32 + i))
652 return -EFAULT;
653 if (put_user(compat_ptr(uptr), ptr64 + i))
654 return -EFAULT;
655 }
656 return 0;
657}
658
659#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
660
661asmlinkage long
662compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
663{
664 struct iocb __user * __user *iocb64;
665 long ret;
666
667 if (unlikely(nr < 0))
668 return -EINVAL;
669
670 if (nr > MAX_AIO_SUBMITS)
671 nr = MAX_AIO_SUBMITS;
672
673 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
674 ret = copy_iocb(nr, iocb, iocb64);
675 if (!ret)
9d85cba7 676 ret = do_io_submit(ctx_id, nr, iocb64, 1);
1da177e4
LT		 677 return ret;
678}
679
680struct compat_ncp_mount_data {
681 compat_int_t version;
682 compat_uint_t ncp_fd;
202e5979 683 __compat_uid_t mounted_uid;
1da177e4
LT		 684 compat_pid_t wdog_pid;
685 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
686 compat_uint_t time_out;
687 compat_uint_t retry_count;
688 compat_uint_t flags;
202e5979
SR		 689 __compat_uid_t uid;
690 __compat_gid_t gid;
1da177e4
LT		 691 compat_mode_t file_mode;
692 compat_mode_t dir_mode;
693};
694
695struct compat_ncp_mount_data_v4 {
696 compat_int_t version;
697 compat_ulong_t flags;
698 compat_ulong_t mounted_uid;
699 compat_long_t wdog_pid;
700 compat_uint_t ncp_fd;
701 compat_uint_t time_out;
702 compat_uint_t retry_count;
703 compat_ulong_t uid;
704 compat_ulong_t gid;
705 compat_ulong_t file_mode;
706 compat_ulong_t dir_mode;
707};
708
709static void *do_ncp_super_data_conv(void *raw_data)
710{
711 int version = *(unsigned int *)raw_data;
712
713 if (version == 3) {
714 struct compat_ncp_mount_data *c_n = raw_data;
715 struct ncp_mount_data *n = raw_data;
716
717 n->dir_mode = c_n->dir_mode;
718 n->file_mode = c_n->file_mode;
719 n->gid = c_n->gid;
720 n->uid = c_n->uid;
721 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
722 n->wdog_pid = c_n->wdog_pid;
723 n->mounted_uid = c_n->mounted_uid;
724 } else if (version == 4) {
725 struct compat_ncp_mount_data_v4 *c_n = raw_data;
726 struct ncp_mount_data_v4 *n = raw_data;
727
728 n->dir_mode = c_n->dir_mode;
729 n->file_mode = c_n->file_mode;
730 n->gid = c_n->gid;
731 n->uid = c_n->uid;
732 n->retry_count = c_n->retry_count;
733 n->time_out = c_n->time_out;
734 n->ncp_fd = c_n->ncp_fd;
735 n->wdog_pid = c_n->wdog_pid;
736 n->mounted_uid = c_n->mounted_uid;
737 n->flags = c_n->flags;
738 } else if (version != 5) {
739 return NULL;
740 }
741
742 return raw_data;
743}
744
745struct compat_smb_mount_data {
746 compat_int_t version;
202e5979
SR		 747 __compat_uid_t mounted_uid;
748 __compat_uid_t uid;
749 __compat_gid_t gid;
1da177e4
LT		 750 compat_mode_t file_mode;
751 compat_mode_t dir_mode;
752};
753
754static void *do_smb_super_data_conv(void *raw_data)
755{
756 struct smb_mount_data *s = raw_data;
757 struct compat_smb_mount_data *c_s = raw_data;
758
759 if (c_s->version != SMB_MOUNT_OLDVERSION)
760 goto out;
761 s->dir_mode = c_s->dir_mode;
762 s->file_mode = c_s->file_mode;
763 s->gid = c_s->gid;
764 s->uid = c_s->uid;
765 s->mounted_uid = c_s->mounted_uid;
766 out:
767 return raw_data;
768}
769
9a9947bf
DH		 770struct compat_nfs_string {
771 compat_uint_t len;
5fc3e624 772 compat_uptr_t data;
9a9947bf
DH		 773};
774
775static inline void compat_nfs_string(struct nfs_string *dst,
776 struct compat_nfs_string *src)
777{
778 dst->data = compat_ptr(src->data);
779 dst->len = src->len;
780}
781
782struct compat_nfs4_mount_data_v1 {
783 compat_int_t version;
784 compat_int_t flags;
785 compat_int_t rsize;
786 compat_int_t wsize;
787 compat_int_t timeo;
788 compat_int_t retrans;
789 compat_int_t acregmin;
790 compat_int_t acregmax;
791 compat_int_t acdirmin;
792 compat_int_t acdirmax;
793 struct compat_nfs_string client_addr;
794 struct compat_nfs_string mnt_path;
795 struct compat_nfs_string hostname;
796 compat_uint_t host_addrlen;
5fc3e624 797 compat_uptr_t host_addr;
9a9947bf
DH		 798 compat_int_t proto;
799 compat_int_t auth_flavourlen;
5fc3e624 800 compat_uptr_t auth_flavours;
9a9947bf
DH		 801};
802
803static int do_nfs4_super_data_conv(void *raw_data)
804{
805 int version = *(compat_uint_t *) raw_data;
806
807 if (version == 1) {
808 struct compat_nfs4_mount_data_v1 *raw = raw_data;
809 struct nfs4_mount_data *real = raw_data;
810
811 /* copy the fields backwards */
812 real->auth_flavours = compat_ptr(raw->auth_flavours);
813 real->auth_flavourlen = raw->auth_flavourlen;
814 real->proto = raw->proto;
815 real->host_addr = compat_ptr(raw->host_addr);
816 real->host_addrlen = raw->host_addrlen;
817 compat_nfs_string(&real->hostname, &raw->hostname);
818 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
819 compat_nfs_string(&real->client_addr, &raw->client_addr);
820 real->acdirmax = raw->acdirmax;
821 real->acdirmin = raw->acdirmin;
822 real->acregmax = raw->acregmax;
823 real->acregmin = raw->acregmin;
824 real->retrans = raw->retrans;
825 real->timeo = raw->timeo;
826 real->wsize = raw->wsize;
827 real->rsize = raw->rsize;
828 real->flags = raw->flags;
829 real->version = raw->version;
830 }
9a9947bf
DH		 831
832 return 0;
833}
834
1da177e4
LT		 835#define SMBFS_NAME "smbfs"
836#define NCPFS_NAME "ncpfs"
9a9947bf 837#define NFS4_NAME "nfs4"
1da177e4
LT		 838
839asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
840 char __user * type, unsigned long flags,
841 void __user * data)
842{
eca6f534 843 char *kernel_type;
1da177e4 844 unsigned long data_page;
eca6f534 845 char *kernel_dev;
1da177e4
LT		 846 char *dir_page;
847 int retval;
848
eca6f534 849 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 850 if (retval < 0)
851 goto out;
852
853 dir_page = getname(dir_name);
854 retval = PTR_ERR(dir_page);
855 if (IS_ERR(dir_page))
856 goto out1;
857
eca6f534 858 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 859 if (retval < 0)
860 goto out2;
861
eca6f534 862 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 863 if (retval < 0)
864 goto out3;
865
866 retval = -EINVAL;
867
eca6f534
VN		 868 if (kernel_type && data_page) {
869 if (!strcmp(kernel_type, SMBFS_NAME)) {
1da177e4 870 do_smb_super_data_conv((void *)data_page);
eca6f534 871 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 872 do_ncp_super_data_conv((void *)data_page);
eca6f534 873 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 874 if (do_nfs4_super_data_conv((void *) data_page))
875 goto out4;
1da177e4
LT		 876 }
877 }
878
eca6f534 879 retval = do_mount(kernel_dev, dir_page, kernel_type,
1da177e4 880 flags, (void*)data_page);
1da177e4 881
9a9947bf 882 out4:
1da177e4
LT		 883 free_page(data_page);
884 out3:
eca6f534 885 kfree(kernel_dev);
1da177e4
LT		 886 out2:
887 putname(dir_page);
888 out1:
eca6f534 889 kfree(kernel_type);
1da177e4
LT		 890 out:
891 return retval;
892}
893
894#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
1da177e4
LT		 895
896struct compat_old_linux_dirent {
897 compat_ulong_t d_ino;
898 compat_ulong_t d_offset;
899 unsigned short d_namlen;
900 char d_name[1];
901};
902
903struct compat_readdir_callback {
904 struct compat_old_linux_dirent __user *dirent;
905 int result;
906};
907
908static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 909 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 910{
911 struct compat_readdir_callback *buf = __buf;
912 struct compat_old_linux_dirent __user *dirent;
afefdbb2 913 compat_ulong_t d_ino;
1da177e4
LT		 914
915 if (buf->result)
916 return -EINVAL;
afefdbb2 917 d_ino = ino;
8f3f655d
AV		 918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->result = -EOVERFLOW;
afefdbb2 920 return -EOVERFLOW;
8f3f655d 921 }
1da177e4
LT		 922 buf->result++;
923 dirent = buf->dirent;
924 if (!access_ok(VERIFY_WRITE, dirent,
925 (unsigned long)(dirent->d_name + namlen + 1) -
926 (unsigned long)dirent))
927 goto efault;
afefdbb2 928 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 929 __put_user(offset, &dirent->d_offset) ||
930 __put_user(namlen, &dirent->d_namlen) ||
931 __copy_to_user(dirent->d_name, name, namlen) ||
932 __put_user(0, dirent->d_name + namlen))
933 goto efault;
934 return 0;
935efault:
936 buf->result = -EFAULT;
937 return -EFAULT;
938}
939
940asmlinkage long compat_sys_old_readdir(unsigned int fd,
941 struct compat_old_linux_dirent __user *dirent, unsigned int count)
942{
943 int error;
944 struct file *file;
945 struct compat_readdir_callback buf;
946
947 error = -EBADF;
948 file = fget(fd);
949 if (!file)
950 goto out;
951
952 buf.result = 0;
953 buf.dirent = dirent;
954
955 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 956 if (buf.result)
1da177e4
LT		 957 error = buf.result;
958
959 fput(file);
960out:
961 return error;
962}
963
964struct compat_linux_dirent {
965 compat_ulong_t d_ino;
966 compat_ulong_t d_off;
967 unsigned short d_reclen;
968 char d_name[1];
969};
970
971struct compat_getdents_callback {
972 struct compat_linux_dirent __user *current_dir;
973 struct compat_linux_dirent __user *previous;
974 int count;
975 int error;
976};
977
978static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 979 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 980{
981 struct compat_linux_dirent __user * dirent;
982 struct compat_getdents_callback *buf = __buf;
afefdbb2 983 compat_ulong_t d_ino;
022a1692 984 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 985
986 buf->error = -EINVAL; /* only used if we fail.. */
987 if (reclen > buf->count)
988 return -EINVAL;
afefdbb2 989 d_ino = ino;
8f3f655d
AV		 990 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
991 buf->error = -EOVERFLOW;
afefdbb2 992 return -EOVERFLOW;
8f3f655d 993 }
1da177e4
LT		 994 dirent = buf->previous;
995 if (dirent) {
996 if (__put_user(offset, &dirent->d_off))
997 goto efault;
998 }
999 dirent = buf->current_dir;
afefdbb2 1000 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 1001 goto efault;
1002 if (__put_user(reclen, &dirent->d_reclen))
1003 goto efault;
1004 if (copy_to_user(dirent->d_name, name, namlen))
1005 goto efault;
1006 if (__put_user(0, dirent->d_name + namlen))
1007 goto efault;
1008 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1009 goto efault;
1010 buf->previous = dirent;
1011 dirent = (void __user *)dirent + reclen;
1012 buf->current_dir = dirent;
1013 buf->count -= reclen;
1014 return 0;
1015efault:
1016 buf->error = -EFAULT;
1017 return -EFAULT;
1018}
1019
1020asmlinkage long compat_sys_getdents(unsigned int fd,
1021 struct compat_linux_dirent __user *dirent, unsigned int count)
1022{
1023 struct file * file;
1024 struct compat_linux_dirent __user * lastdirent;
1025 struct compat_getdents_callback buf;
1026 int error;
1027
1028 error = -EFAULT;
1029 if (!access_ok(VERIFY_WRITE, dirent, count))
1030 goto out;
1031
1032 error = -EBADF;
1033 file = fget(fd);
1034 if (!file)
1035 goto out;
1036
1037 buf.current_dir = dirent;
1038 buf.previous = NULL;
1039 buf.count = count;
1040 buf.error = 0;
1041
1042 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 1043 if (error >= 0)
1044 error = buf.error;
1da177e4
LT		 1045 lastdirent = buf.previous;
1046 if (lastdirent) {
1047 if (put_user(file->f_pos, &lastdirent->d_off))
1048 error = -EFAULT;
1049 else
1050 error = count - buf.count;
1051 }
1da177e4
LT		 1052 fput(file);
1053out:
1054 return error;
1055}
1056
1057#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 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,
afefdbb2 1067 u64 ino, unsigned int d_type)
1da177e4
LT		 1068{
1069 struct linux_dirent64 __user *dirent;
1070 struct compat_getdents_callback64 *buf = __buf;
1071 int jj = NAME_OFFSET(dirent);
022a1692 1072 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1da177e4
LT		 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);
53c9c5c0
AV		 1131 if (error >= 0)
1132 error = buf.error;
1da177e4
LT		 1133 lastdirent = buf.previous;
1134 if (lastdirent) {
1135 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1136 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1137 error = -EFAULT;
1138 else
1139 error = count - buf.count;
1da177e4 1140 }
1da177e4
LT		 1141 fput(file);
1142out:
1143 return error;
1144}
1145#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1146
1147static ssize_t compat_do_readv_writev(int type, struct file *file,
1148 const struct compat_iovec __user *uvector,
1149 unsigned long nr_segs, loff_t *pos)
1150{
1da177e4
LT		 1151 compat_ssize_t tot_len;
1152 struct iovec iovstack[UIO_FASTIOV];
b8373363 1153 struct iovec *iov;
1da177e4 1154 ssize_t ret;
1da177e4
LT		 1155 io_fn_t fn;
1156 iov_fn_t fnv;
1157
1da177e4 1158 ret = -EINVAL;
1da177e4
LT		 1159 if (!file->f_op)
1160 goto out;
b8373363 1161
1da177e4
LT		 1162 ret = -EFAULT;
1163 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1164 goto out;
1165
b8373363
JM		 1166 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1167 UIO_FASTIOV, iovstack, &iov);
1da177e4
LT		 1168 if (tot_len == 0) {
1169 ret = 0;
1170 goto out;
1171 }
1172
1173 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1174 if (ret < 0)
1da177e4
LT		 1175 goto out;
1176
1177 fnv = NULL;
1178 if (type == READ) {
1179 fn = file->f_op->read;
ee0b3e67 1180 fnv = file->f_op->aio_read;
1da177e4
LT		 1181 } else {
1182 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1183 fnv = file->f_op->aio_write;
1da177e4
LT		 1184 }
1185
ee0b3e67
BP		 1186 if (fnv)
1187 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1188 pos, fnv);
1189 else
1190 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1191
1da177e4
LT		 1192out:
1193 if (iov != iovstack)
1194 kfree(iov);
0eeca283 1195 if ((ret + (type == READ)) > 0) {
0eeca283 1196 if (type == READ)
2a12a9d7 1197 fsnotify_access(file);
0eeca283 1198 else
2a12a9d7 1199 fsnotify_modify(file);
0eeca283 1200 }
1da177e4
LT		 1201 return ret;
1202}
1203
dac12138
GH		 1204static size_t compat_readv(struct file *file,
1205 const struct compat_iovec __user *vec,
1206 unsigned long vlen, loff_t *pos)
1da177e4 1207{
1da177e4
LT		 1208 ssize_t ret = -EBADF;
1209
1da177e4
LT		 1210 if (!(file->f_mode & FMODE_READ))
1211 goto out;
1212
1213 ret = -EINVAL;
ee0b3e67 1214 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1215 goto out;
1216
dac12138 1217 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1218
1219out:
ca8a5bd2
GH		 1220 if (ret > 0)
1221 add_rchar(current, ret);
1222 inc_syscr(current);
dac12138
GH		 1223 return ret;
1224}
1225
1226asmlinkage ssize_t
1227compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1228 unsigned long vlen)
1229{
1230 struct file *file;
10c7db27 1231 int fput_needed;
dac12138
GH		 1232 ssize_t ret;
1233
10c7db27 1234 file = fget_light(fd, &fput_needed);
dac12138
GH		 1235 if (!file)
1236 return -EBADF;
1237 ret = compat_readv(file, vec, vlen, &file->f_pos);
10c7db27 1238 fput_light(file, fput_needed);
1da177e4
LT		 1239 return ret;
1240}
1241
f3554f4b
GH		 1242asmlinkage ssize_t
1243compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1244 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1245{
1246 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1247 struct file *file;
10c7db27 1248 int fput_needed;
f3554f4b
GH		 1249 ssize_t ret;
1250
1251 if (pos < 0)
1252 return -EINVAL;
10c7db27 1253 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1254 if (!file)
1255 return -EBADF;
1256 ret = compat_readv(file, vec, vlen, &pos);
10c7db27 1257 fput_light(file, fput_needed);
f3554f4b
GH		 1258 return ret;
1259}
1260
6949a631
GH		 1261static size_t compat_writev(struct file *file,
1262 const struct compat_iovec __user *vec,
1263 unsigned long vlen, loff_t *pos)
1da177e4 1264{
1da177e4
LT		 1265 ssize_t ret = -EBADF;
1266
1da177e4
LT		 1267 if (!(file->f_mode & FMODE_WRITE))
1268 goto out;
1269
1270 ret = -EINVAL;
ee0b3e67 1271 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1272 goto out;
1273
6949a631 1274 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1da177e4
LT		 1275
1276out:
ca8a5bd2
GH		 1277 if (ret > 0)
1278 add_wchar(current, ret);
1279 inc_syscw(current);
6949a631
GH		 1280 return ret;
1281}
1282
1283asmlinkage ssize_t
1284compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1285 unsigned long vlen)
1286{
1287 struct file *file;
10c7db27 1288 int fput_needed;
6949a631
GH		 1289 ssize_t ret;
1290
10c7db27 1291 file = fget_light(fd, &fput_needed);
6949a631
GH		 1292 if (!file)
1293 return -EBADF;
1294 ret = compat_writev(file, vec, vlen, &file->f_pos);
10c7db27 1295 fput_light(file, fput_needed);
1da177e4
LT		 1296 return ret;
1297}
1298
f3554f4b
GH		 1299asmlinkage ssize_t
1300compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1301 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1302{
1303 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1304 struct file *file;
10c7db27 1305 int fput_needed;
f3554f4b
GH		 1306 ssize_t ret;
1307
1308 if (pos < 0)
1309 return -EINVAL;
10c7db27 1310 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1311 if (!file)
1312 return -EBADF;
1313 ret = compat_writev(file, vec, vlen, &pos);
10c7db27 1314 fput_light(file, fput_needed);
f3554f4b
GH		 1315 return ret;
1316}
1317
d2610202
AK		 1318asmlinkage long
1319compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1320 unsigned int nr_segs, unsigned int flags)
1321{
1322 unsigned i;
90cbad65 1323 struct iovec __user *iov;
98232d50 1324 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1325 return -EINVAL;
1326 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1327 for (i = 0; i < nr_segs; i++) {
1328 struct compat_iovec v;
1329 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1330 get_user(v.iov_len, &iov32[i].iov_len) ||
1331 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1332 put_user(v.iov_len, &iov[i].iov_len))
1333 return -EFAULT;
1334 }
1335 return sys_vmsplice(fd, iov, nr_segs, flags);
1336}
1337
e922efc3
MS		 1338/*
1339 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1340 * O_LARGEFILE flag.
1341 */
1342asmlinkage long
1343compat_sys_open(const char __user *filename, int flags, int mode)
1344{
5590ff0d
UD		 1345 return do_sys_open(AT_FDCWD, filename, flags, mode);
1346}
1347
1348/*
1349 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1350 * O_LARGEFILE flag.
1351 */
1352asmlinkage long
9ad11ab4 1353compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1354{
1355 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1356}
1357
1da177e4
LT		 1358/*
1359 * compat_count() counts the number of arguments/envelopes. It is basically
1360 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1361 * and envp pointers.
1362 */
1363static int compat_count(compat_uptr_t __user *argv, int max)
1364{
1365 int i = 0;
1366
1367 if (argv != NULL) {
1368 for (;;) {
1369 compat_uptr_t p;
1370
1371 if (get_user(p, argv))
1372 return -EFAULT;
1373 if (!p)
1374 break;
1375 argv++;
362e6663 1376 if (i++ >= max)
1da177e4
LT		 1377 return -E2BIG;
1378 }
1379 }
1380 return i;
1381}
1382
1383/*
1384 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1385 * except that it works with 32 bit argv and envp pointers.
1386 */
1387static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1388 struct linux_binprm *bprm)
1389{
1390 struct page *kmapped_page = NULL;
1391 char *kaddr = NULL;
b6a2fea3 1392 unsigned long kpos = 0;
1da177e4
LT		 1393 int ret;
1394
1395 while (argc-- > 0) {
1396 compat_uptr_t str;
1397 int len;
1398 unsigned long pos;
1399
1400 if (get_user(str, argv+argc) ||
b6a2fea3 1401 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1402 ret = -EFAULT;
1403 goto out;
1404 }
1405
b6a2fea3 1406 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1407 ret = -E2BIG;
1408 goto out;
1409 }
1410
b6a2fea3 1411 /* We're going to work our way backwords. */
1da177e4 1412 pos = bprm->p;
b6a2fea3
OW		 1413 str += len;
1414 bprm->p -= len;
1da177e4
LT		 1415
1416 while (len > 0) {
1da177e4 1417 int offset, bytes_to_copy;
1da177e4
LT		 1418
1419 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1420 if (offset == 0)
1421 offset = PAGE_SIZE;
1422
1423 bytes_to_copy = offset;
1424 if (bytes_to_copy > len)
1425 bytes_to_copy = len;
1426
1427 offset -= bytes_to_copy;
1428 pos -= bytes_to_copy;
1429 str -= bytes_to_copy;
1430 len -= bytes_to_copy;
1431
1432 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1433 struct page *page;
1434
1435#ifdef CONFIG_STACK_GROWSUP
1436 ret = expand_stack_downwards(bprm->vma, pos);
1437 if (ret < 0) {
1438 /* We've exceed the stack rlimit. */
1439 ret = -E2BIG;
1440 goto out;
1441 }
1442#endif
1443 ret = get_user_pages(current, bprm->mm, pos,
1444 1, 1, 1, &page, NULL);
1445 if (ret <= 0) {
1446 /* We've exceed the stack rlimit. */
1447 ret = -E2BIG;
1da177e4
LT		 1448 goto out;
1449 }
1da177e4 1450
b6a2fea3
OW		 1451 if (kmapped_page) {
1452 flush_kernel_dcache_page(kmapped_page);
1da177e4 1453 kunmap(kmapped_page);
b6a2fea3
OW		 1454 put_page(kmapped_page);
1455 }
1da177e4
LT		 1456 kmapped_page = page;
1457 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1458 kpos = pos & PAGE_MASK;
1459 flush_cache_page(bprm->vma, kpos,
1460 page_to_pfn(kmapped_page));
1da177e4 1461 }
b6a2fea3
OW		 1462 if (copy_from_user(kaddr+offset, compat_ptr(str),
1463 bytes_to_copy)) {
1da177e4
LT		 1464 ret = -EFAULT;
1465 goto out;
1466 }
1da177e4
LT		 1467 }
1468 }
1469 ret = 0;
1470out:
b6a2fea3
OW		 1471 if (kmapped_page) {
1472 flush_kernel_dcache_page(kmapped_page);
1da177e4 1473 kunmap(kmapped_page);
b6a2fea3 1474 put_page(kmapped_page);
1da177e4 1475 }
b6a2fea3 1476 return ret;
1da177e4
LT		 1477}
1478
1da177e4
LT		 1479/*
1480 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1481 * that it processes 32 bit argv and envp pointers.
1482 */
1483int compat_do_execve(char * filename,
1484 compat_uptr_t __user *argv,
1485 compat_uptr_t __user *envp,
1486 struct pt_regs * regs)
1487{
1488 struct linux_binprm *bprm;
1489 struct file *file;
53e9309e 1490 struct files_struct *displaced;
8c652f96 1491 bool clear_in_exec;
1da177e4 1492 int retval;
1da177e4 1493
53e9309e
HD		 1494 retval = unshare_files(&displaced);
1495 if (retval)
1496 goto out_ret;
1497
1da177e4 1498 retval = -ENOMEM;
11b0b5ab 1499 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1500 if (!bprm)
53e9309e 1501 goto out_files;
1da177e4 1502
a2a8474c
ON		 1503 retval = prepare_bprm_creds(bprm);
1504 if (retval)
a6f76f23 1505 goto out_free;
498052bb
AV		 1506
1507 retval = check_unsafe_exec(bprm);
8c652f96 1508 if (retval < 0)
a2a8474c 1509 goto out_free;
8c652f96 1510 clear_in_exec = retval;
a2a8474c 1511 current->in_execve = 1;
a6f76f23 1512
1da177e4
LT		 1513 file = open_exec(filename);
1514 retval = PTR_ERR(file);
1515 if (IS_ERR(file))
498052bb 1516 goto out_unmark;
1da177e4
LT		 1517
1518 sched_exec();
1519
1da177e4
LT		 1520 bprm->file = file;
1521 bprm->filename = filename;
1522 bprm->interp = filename;
1da177e4 1523
b6a2fea3
OW		 1524 retval = bprm_mm_init(bprm);
1525 if (retval)
1526 goto out_file;
1da177e4 1527
b6a2fea3 1528 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1529 if ((retval = bprm->argc) < 0)
a6f76f23 1530 goto out;
1da177e4 1531
b6a2fea3 1532 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1533 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1534 goto out;
1535
1536 retval = prepare_binprm(bprm);
1537 if (retval < 0)
1538 goto out;
1539
1540 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1541 if (retval < 0)
1542 goto out;
1543
1544 bprm->exec = bprm->p;
1545 retval = compat_copy_strings(bprm->envc, envp, bprm);
1546 if (retval < 0)
1547 goto out;
1548
1549 retval = compat_copy_strings(bprm->argc, argv, bprm);
1550 if (retval < 0)
1551 goto out;
1552
1553 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1554 if (retval < 0)
1555 goto out;
1da177e4 1556
a6f76f23 1557 /* execve succeeded */
498052bb 1558 current->fs->in_exec = 0;
f9ce1f1c 1559 current->in_execve = 0;
a6f76f23
DH		 1560 acct_update_integrals(current);
1561 free_bprm(bprm);
53e9309e
HD		 1562 if (displaced)
1563 put_files_struct(displaced);
a6f76f23 1564 return retval;
1da177e4 1565
a6f76f23 1566out:
1da177e4 1567 if (bprm->mm)
b6a2fea3 1568 mmput(bprm->mm);
1da177e4
LT		 1569
1570out_file:
1571 if (bprm->file) {
1572 allow_write_access(bprm->file);
1573 fput(bprm->file);
1574 }
1575
498052bb 1576out_unmark:
8c652f96
ON		 1577 if (clear_in_exec)
1578 current->fs->in_exec = 0;
f9ce1f1c 1579 current->in_execve = 0;
a6f76f23
DH		 1580
1581out_free:
08a6fac1 1582 free_bprm(bprm);
1da177e4 1583
53e9309e
HD		 1584out_files:
1585 if (displaced)
1586 reset_files_struct(displaced);
1da177e4
LT		 1587out_ret:
1588 return retval;
1589}
1590
1591#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1592
b773ad40
TG		 1593static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1594 int timeval, int ret)
1595{
1596 struct timespec ts;
1597
1598 if (!p)
1599 return ret;
1600
1601 if (current->personality & STICKY_TIMEOUTS)
1602 goto sticky;
1603
1604 /* No update for zero timeout */
1605 if (!end_time->tv_sec && !end_time->tv_nsec)
1606 return ret;
1607
1608 ktime_get_ts(&ts);
1609 ts = timespec_sub(*end_time, ts);
1610 if (ts.tv_sec < 0)
1611 ts.tv_sec = ts.tv_nsec = 0;
1612
1613 if (timeval) {
1614 struct compat_timeval rtv;
1615
1616 rtv.tv_sec = ts.tv_sec;
1617 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1618
1619 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1620 return ret;
1621 } else {
1622 struct compat_timespec rts;
1623
1624 rts.tv_sec = ts.tv_sec;
1625 rts.tv_nsec = ts.tv_nsec;
1626
1627 if (!copy_to_user(p, &rts, sizeof(rts)))
1628 return ret;
1629 }
1630 /*
1631 * If an application puts its timeval in read-only memory, we
1632 * don't want the Linux-specific update to the timeval to
1633 * cause a fault after the select has completed
1634 * successfully. However, because we're not updating the
1635 * timeval, we can't restart the system call.
1636 */
1637
1638sticky:
1639 if (ret == -ERESTARTNOHAND)
1640 ret = -EINTR;
1641 return ret;
1642}
1643
1da177e4
LT		 1644/*
1645 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1646 * 64-bit unsigned longs.
1647 */
858119e1 1648static
1da177e4
LT		 1649int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1650 unsigned long *fdset)
1651{
022a1692 1652 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1653 if (ufdset) {
1654 unsigned long odd;
1655
1656 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1657 return -EFAULT;
1658
1659 odd = nr & 1UL;
1660 nr &= ~1UL;
1661 while (nr) {
1662 unsigned long h, l;
7116e994
HC		 1663 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1664 return -EFAULT;
1da177e4
LT		 1665 ufdset += 2;
1666 *fdset++ = h << 32 | l;
1667 nr -= 2;
1668 }
7116e994
HC		 1669 if (odd && __get_user(*fdset, ufdset))
1670 return -EFAULT;
1da177e4
LT		 1671 } else {
1672 /* Tricky, must clear full unsigned long in the
1673 * kernel fdset at the end, this makes sure that
1674 * actually happens.
1675 */
1676 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1677 }
1678 return 0;
1679}
1680
858119e1 1681static
7116e994
HC		 1682int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1683 unsigned long *fdset)
1da177e4
LT		 1684{
1685 unsigned long odd;
022a1692 1686 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1687
1688 if (!ufdset)
7116e994 1689 return 0;
1da177e4
LT		 1690
1691 odd = nr & 1UL;
1692 nr &= ~1UL;
1693 while (nr) {
1694 unsigned long h, l;
1695 l = *fdset++;
1696 h = l >> 32;
7116e994
HC		 1697 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1698 return -EFAULT;
1da177e4
LT		 1699 ufdset += 2;
1700 nr -= 2;
1701 }
7116e994
HC		 1702 if (odd && __put_user(*fdset, ufdset))
1703 return -EFAULT;
1704 return 0;
1da177e4
LT		 1705}
1706
1707
1708/*
1709 * This is a virtual copy of sys_select from fs/select.c and probably
1710 * should be compared to it from time to time
1711 */
1da177e4
LT		 1712
1713/*
1714 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1715 * like to be certain this leads to no problems. So I return
1716 * EINTR just for safety.
1717 *
1718 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1719 * I'm trying ERESTARTNOHAND which restart only when you want to.
1720 */
1721#define MAX_SELECT_SECONDS \
1722 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1723
9f72949f 1724int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1725 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1726 struct timespec *end_time)
1da177e4
LT		 1727{
1728 fd_set_bits fds;
6087b2da 1729 void *bits;
bbea9f69 1730 int size, max_fds, ret = -EINVAL;
a4531edd 1731 struct fdtable *fdt;
6087b2da 1732 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1733
1da177e4
LT		 1734 if (n < 0)
1735 goto out_nofds;
1736
bbea9f69 1737 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1738 rcu_read_lock();
a4531edd 1739 fdt = files_fdtable(current->files);
bbea9f69 1740 max_fds = fdt->max_fds;
ac5b8b6f 1741 rcu_read_unlock();
bbea9f69
VL		 1742 if (n > max_fds)
1743 n = max_fds;
1da177e4
LT		 1744
1745 /*
1746 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1747 * since we used fdset we need to allocate memory in units of
1748 * long-words.
1749 */
1da177e4 1750 size = FDS_BYTES(n);
6087b2da
BP		 1751 bits = stack_fds;
1752 if (size > sizeof(stack_fds) / 6) {
1753 bits = kmalloc(6 * size, GFP_KERNEL);
1754 ret = -ENOMEM;
1755 if (!bits)
1756 goto out_nofds;
1757 }
1da177e4
LT		 1758 fds.in = (unsigned long *) bits;
1759 fds.out = (unsigned long *) (bits + size);
1760 fds.ex = (unsigned long *) (bits + 2*size);
1761 fds.res_in = (unsigned long *) (bits + 3*size);
1762 fds.res_out = (unsigned long *) (bits + 4*size);
1763 fds.res_ex = (unsigned long *) (bits + 5*size);
1764
1765 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1766 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1767 (ret = compat_get_fd_set(n, exp, fds.ex)))
1768 goto out;
1769 zero_fd_set(n, fds.res_in);
1770 zero_fd_set(n, fds.res_out);
1771 zero_fd_set(n, fds.res_ex);
1772
8ff3e8e8 1773 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1774
1775 if (ret < 0)
1776 goto out;
1777 if (!ret) {
1778 ret = -ERESTARTNOHAND;
1779 if (signal_pending(current))
1780 goto out;
1781 ret = 0;
1782 }
1783
7116e994
HC		 1784 if (compat_set_fd_set(n, inp, fds.res_in) ||
1785 compat_set_fd_set(n, outp, fds.res_out) ||
1786 compat_set_fd_set(n, exp, fds.res_ex))
1787 ret = -EFAULT;
1da177e4 1788out:
6087b2da
BP		 1789 if (bits != stack_fds)
1790 kfree(bits);
1da177e4
LT		 1791out_nofds:
1792 return ret;
1793}
1794
9f72949f
DW		 1795asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1796 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1797 struct compat_timeval __user *tvp)
1798{
8ff3e8e8 1799 struct timespec end_time, *to = NULL;
9f72949f
DW		 1800 struct compat_timeval tv;
1801 int ret;
1802
1803 if (tvp) {
1804 if (copy_from_user(&tv, tvp, sizeof(tv)))
1805 return -EFAULT;
1806
8ff3e8e8 1807 to = &end_time;
4d36a9e6
AV		 1808 if (poll_select_set_timeout(to,
1809 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1810 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1811 return -EINVAL;
9f72949f
DW		 1812 }
1813
8ff3e8e8
AV		 1814 ret = compat_core_sys_select(n, inp, outp, exp, to);
1815 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1816
1817 return ret;
1818}
1819
5d0e5283
CH		 1820struct compat_sel_arg_struct {
1821 compat_ulong_t n;
1822 compat_uptr_t inp;
1823 compat_uptr_t outp;
1824 compat_uptr_t exp;
1825 compat_uptr_t tvp;
1826};
1827
1828asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1829{
1830 struct compat_sel_arg_struct a;
1831
1832 if (copy_from_user(&a, arg, sizeof(a)))
1833 return -EFAULT;
1834 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1835 compat_ptr(a.exp), compat_ptr(a.tvp));
1836}
1837
f3de272b 1838#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1839static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1840 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1841 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1842 compat_size_t sigsetsize)
1843{
1844 compat_sigset_t ss32;
1845 sigset_t ksigmask, sigsaved;
9f72949f 1846 struct compat_timespec ts;
8ff3e8e8 1847 struct timespec end_time, *to = NULL;
9f72949f
DW		 1848 int ret;
1849
1850 if (tsp) {
1851 if (copy_from_user(&ts, tsp, sizeof(ts)))
1852 return -EFAULT;
1853
8ff3e8e8
AV		 1854 to = &end_time;
1855 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1856 return -EINVAL;
1857 }
1858
1859 if (sigmask) {
1860 if (sigsetsize != sizeof(compat_sigset_t))
1861 return -EINVAL;
1862 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1863 return -EFAULT;
1864 sigset_from_compat(&ksigmask, &ss32);
1865
1866 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1867 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1868 }
1869
8ff3e8e8
AV		 1870 ret = compat_core_sys_select(n, inp, outp, exp, to);
1871 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1872
1873 if (ret == -ERESTARTNOHAND) {
1874 /*
1875 * Don't restore the signal mask yet. Let do_signal() deliver
1876 * the signal on the way back to userspace, before the signal
1877 * mask is restored.
1878 */
1879 if (sigmask) {
1880 memcpy(&current->saved_sigmask, &sigsaved,
1881 sizeof(sigsaved));
4e4c22c7 1882 set_restore_sigmask();
9f72949f
DW		 1883 }
1884 } else if (sigmask)
1885 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1886
1887 return ret;
1888}
1889
1890asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1891 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1892 struct compat_timespec __user *tsp, void __user *sig)
1893{
1894 compat_size_t sigsetsize = 0;
1895 compat_uptr_t up = 0;
1896
1897 if (sig) {
1898 if (!access_ok(VERIFY_READ, sig,
1899 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1900 __get_user(up, (compat_uptr_t __user *)sig) ||
1901 __get_user(sigsetsize,
1902 (compat_size_t __user *)(sig+sizeof(up))))
1903 return -EFAULT;
1904 }
c9da9f21
HC		 1905 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1906 sigsetsize);
9f72949f
DW		 1907}
1908
1909asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1910 unsigned int nfds, struct compat_timespec __user *tsp,
1911 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1912{
1913 compat_sigset_t ss32;
1914 sigset_t ksigmask, sigsaved;
1915 struct compat_timespec ts;
8ff3e8e8 1916 struct timespec end_time, *to = NULL;
9f72949f
DW		 1917 int ret;
1918
1919 if (tsp) {
1920 if (copy_from_user(&ts, tsp, sizeof(ts)))
1921 return -EFAULT;
1922
8ff3e8e8
AV		 1923 to = &end_time;
1924 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1925 return -EINVAL;
9f72949f
DW		 1926 }
1927
1928 if (sigmask) {
3835a9bd 1929 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1930 return -EINVAL;
1931 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1932 return -EFAULT;
1933 sigset_from_compat(&ksigmask, &ss32);
1934
1935 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1936 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1937 }
1938
8ff3e8e8 1939 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1940
1941 /* We can restart this syscall, usually */
1942 if (ret == -EINTR) {
1943 /*
1944 * Don't restore the signal mask yet. Let do_signal() deliver
1945 * the signal on the way back to userspace, before the signal
1946 * mask is restored.
1947 */
1948 if (sigmask) {
1949 memcpy(&current->saved_sigmask, &sigsaved,
1950 sizeof(sigsaved));
4e4c22c7 1951 set_restore_sigmask();
9f72949f
DW		 1952 }
1953 ret = -ERESTARTNOHAND;
1954 } else if (sigmask)
1955 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1956
8ff3e8e8 1957 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1958
1959 return ret;
1960}
f3de272b 1961#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1962
1da177e4
LT		 1963#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1964/* Stuff for NFS server syscalls... */
1965struct compat_nfsctl_svc {
1966 u16 svc32_port;
1967 s32 svc32_nthreads;
1968};
1969
1970struct compat_nfsctl_client {
1971 s8 cl32_ident[NFSCLNT_IDMAX+1];
1972 s32 cl32_naddr;
1973 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1974 s32 cl32_fhkeytype;
1975 s32 cl32_fhkeylen;
1976 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1977};
1978
1979struct compat_nfsctl_export {
1980 char ex32_client[NFSCLNT_IDMAX+1];
1981 char ex32_path[NFS_MAXPATHLEN+1];
1982 compat_dev_t ex32_dev;
1983 compat_ino_t ex32_ino;
1984 compat_int_t ex32_flags;
202e5979
SR		 1985 __compat_uid_t ex32_anon_uid;
1986 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1987};
1988
1989struct compat_nfsctl_fdparm {
1990 struct sockaddr gd32_addr;
1991 s8 gd32_path[NFS_MAXPATHLEN+1];
1992 compat_int_t gd32_version;
1993};
1994
1995struct compat_nfsctl_fsparm {
1996 struct sockaddr gd32_addr;
1997 s8 gd32_path[NFS_MAXPATHLEN+1];
1998 compat_int_t gd32_maxlen;
1999};
2000
2001struct compat_nfsctl_arg {
2002 compat_int_t ca32_version; /* safeguard */
2003 union {
2004 struct compat_nfsctl_svc u32_svc;
2005 struct compat_nfsctl_client u32_client;
2006 struct compat_nfsctl_export u32_export;
2007 struct compat_nfsctl_fdparm u32_getfd;
2008 struct compat_nfsctl_fsparm u32_getfs;
2009 } u;
2010#define ca32_svc u.u32_svc
2011#define ca32_client u.u32_client
2012#define ca32_export u.u32_export
2013#define ca32_getfd u.u32_getfd
2014#define ca32_getfs u.u32_getfs
2015};
2016
2017union compat_nfsctl_res {
2018 __u8 cr32_getfh[NFS_FHSIZE];
2019 struct knfsd_fh cr32_getfs;
2020};
2021
d64b1c87
LFS		 2022static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2023 struct compat_nfsctl_arg __user *arg)
1da177e4 2024{
d64b1c87
LFS		 2025 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2026 get_user(karg->ca_version, &arg->ca32_version) ||
2027 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2028 __get_user(karg->ca_svc.svc_nthreads,
2029 &arg->ca32_svc.svc32_nthreads))
2030 return -EFAULT;
2031 return 0;
1da177e4
LT		 2032}
2033
d64b1c87
LFS		 2034static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2035 struct compat_nfsctl_arg __user *arg)
1da177e4 2036{
d64b1c87
LFS		 2037 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2038 sizeof(arg->ca32_client)) ||
2039 get_user(karg->ca_version, &arg->ca32_version) ||
2040 __copy_from_user(&karg->ca_client.cl_ident[0],
2041 &arg->ca32_client.cl32_ident[0],
2042 NFSCLNT_IDMAX) ||
2043 __get_user(karg->ca_client.cl_naddr,
2044 &arg->ca32_client.cl32_naddr) ||
2045 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2046 &arg->ca32_client.cl32_addrlist[0],
2047 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2048 __get_user(karg->ca_client.cl_fhkeytype,
2049 &arg->ca32_client.cl32_fhkeytype) ||
2050 __get_user(karg->ca_client.cl_fhkeylen,
2051 &arg->ca32_client.cl32_fhkeylen) ||
2052 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2053 &arg->ca32_client.cl32_fhkey[0],
2054 NFSCLNT_KEYMAX))
2055 return -EFAULT;
1da177e4 2056
d64b1c87 2057 return 0;
1da177e4
LT		 2058}
2059
d64b1c87
LFS		 2060static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2061 struct compat_nfsctl_arg __user *arg)
1da177e4 2062{
d64b1c87
LFS		 2063 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2064 sizeof(arg->ca32_export)) ||
2065 get_user(karg->ca_version, &arg->ca32_version) ||
2066 __copy_from_user(&karg->ca_export.ex_client[0],
2067 &arg->ca32_export.ex32_client[0],
2068 NFSCLNT_IDMAX) ||
2069 __copy_from_user(&karg->ca_export.ex_path[0],
2070 &arg->ca32_export.ex32_path[0],
2071 NFS_MAXPATHLEN) ||
2072 __get_user(karg->ca_export.ex_dev,
2073 &arg->ca32_export.ex32_dev) ||
2074 __get_user(karg->ca_export.ex_ino,
2075 &arg->ca32_export.ex32_ino) ||
2076 __get_user(karg->ca_export.ex_flags,
2077 &arg->ca32_export.ex32_flags) ||
2078 __get_user(karg->ca_export.ex_anon_uid,
2079 &arg->ca32_export.ex32_anon_uid) ||
2080 __get_user(karg->ca_export.ex_anon_gid,
2081 &arg->ca32_export.ex32_anon_gid))
2082 return -EFAULT;
1da177e4
LT		 2083 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2084 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2085
d64b1c87 2086 return 0;
1da177e4
LT		 2087}
2088
d64b1c87
LFS		 2089static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2090 struct compat_nfsctl_arg __user *arg)
1da177e4 2091{
d64b1c87
LFS		 2092 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2093 sizeof(arg->ca32_getfd)) ||
2094 get_user(karg->ca_version, &arg->ca32_version) ||
2095 __copy_from_user(&karg->ca_getfd.gd_addr,
2096 &arg->ca32_getfd.gd32_addr,
2097 (sizeof(struct sockaddr))) ||
2098 __copy_from_user(&karg->ca_getfd.gd_path,
2099 &arg->ca32_getfd.gd32_path,
2100 (NFS_MAXPATHLEN+1)) ||
2101 __get_user(karg->ca_getfd.gd_version,
2102 &arg->ca32_getfd.gd32_version))
2103 return -EFAULT;
1da177e4 2104
d64b1c87 2105 return 0;
1da177e4
LT		 2106}
2107
d64b1c87
LFS		 2108static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2109 struct compat_nfsctl_arg __user *arg)
1da177e4 2110{
d64b1c87
LFS		 2111 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2112 get_user(karg->ca_version, &arg->ca32_version) ||
2113 __copy_from_user(&karg->ca_getfs.gd_addr,
2114 &arg->ca32_getfs.gd32_addr,
2115 (sizeof(struct sockaddr))) ||
2116 __copy_from_user(&karg->ca_getfs.gd_path,
2117 &arg->ca32_getfs.gd32_path,
2118 (NFS_MAXPATHLEN+1)) ||
2119 __get_user(karg->ca_getfs.gd_maxlen,
2120 &arg->ca32_getfs.gd32_maxlen))
2121 return -EFAULT;
1da177e4 2122
d64b1c87 2123 return 0;
1da177e4
LT		 2124}
2125
2126/* This really doesn't need translations, we are only passing
2127 * back a union which contains opaque nfs file handle data.
2128 */
d64b1c87
LFS		 2129static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2130 union compat_nfsctl_res __user *res)
1da177e4
LT		 2131{
2132 int err;
2133
2134 err = copy_to_user(res, kres, sizeof(*res));
2135
2136 return (err) ? -EFAULT : 0;
2137}
2138
d64b1c87
LFS		 2139asmlinkage long compat_sys_nfsservctl(int cmd,
2140 struct compat_nfsctl_arg __user *arg,
2141 union compat_nfsctl_res __user *res)
1da177e4
LT		 2142{
2143 struct nfsctl_arg *karg;
2144 union nfsctl_res *kres;
2145 mm_segment_t oldfs;
2146 int err;
2147
2148 karg = kmalloc(sizeof(*karg), GFP_USER);
2149 kres = kmalloc(sizeof(*kres), GFP_USER);
2150 if(!karg || !kres) {
2151 err = -ENOMEM;
2152 goto done;
2153 }
2154
2155 switch(cmd) {
2156 case NFSCTL_SVC:
2157 err = compat_nfs_svc_trans(karg, arg);
2158 break;
2159
2160 case NFSCTL_ADDCLIENT:
2161 err = compat_nfs_clnt_trans(karg, arg);
2162 break;
2163
2164 case NFSCTL_DELCLIENT:
2165 err = compat_nfs_clnt_trans(karg, arg);
2166 break;
2167
2168 case NFSCTL_EXPORT:
2169 case NFSCTL_UNEXPORT:
2170 err = compat_nfs_exp_trans(karg, arg);
2171 break;
2172
2173 case NFSCTL_GETFD:
2174 err = compat_nfs_getfd_trans(karg, arg);
2175 break;
2176
2177 case NFSCTL_GETFS:
2178 err = compat_nfs_getfs_trans(karg, arg);
2179 break;
2180
2181 default:
2182 err = -EINVAL;
57070d01 2183 break;
1da177e4
LT		 2184 }
2185
57070d01
PS		 2186 if (err)
2187 goto done;
2188
1da177e4
LT		 2189 oldfs = get_fs();
2190 set_fs(KERNEL_DS);
2191 /* The __user pointer casts are valid because of the set_fs() */
2192 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2193 set_fs(oldfs);
2194
2195 if (err)
2196 goto done;
2197
2198 if((cmd == NFSCTL_GETFD) ||
2199 (cmd == NFSCTL_GETFS))
2200 err = compat_nfs_getfh_res_trans(kres, res);
2201
2202done:
2203 kfree(karg);
2204 kfree(kres);
2205 return err;
2206}
2207#else /* !NFSD */
2208long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2209{
2210 return sys_ni_syscall();
2211}
2212#endif
f6dfb4fd
DL		 2213
2214#ifdef CONFIG_EPOLL
2215
f3de272b 2216#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2217asmlinkage long compat_sys_epoll_pwait(int epfd,
2218 struct compat_epoll_event __user *events,
2219 int maxevents, int timeout,
2220 const compat_sigset_t __user *sigmask,
2221 compat_size_t sigsetsize)
2222{
2223 long err;
2224 compat_sigset_t csigmask;
2225 sigset_t ksigmask, sigsaved;
2226
2227 /*
2228 * If the caller wants a certain signal mask to be set during the wait,
2229 * we apply it here.
2230 */
2231 if (sigmask) {
2232 if (sigsetsize != sizeof(compat_sigset_t))
2233 return -EINVAL;
2234 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2235 return -EFAULT;
2236 sigset_from_compat(&ksigmask, &csigmask);
2237 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2238 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2239 }
2240
f6dfb4fd 2241 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2242
2243 /*
2244 * If we changed the signal mask, we need to restore the original one.
2245 * In case we've got a signal while waiting, we do not restore the
2246 * signal mask yet, and we allow do_signal() to deliver the signal on
2247 * the way back to userspace, before the signal mask is restored.
2248 */
2249 if (sigmask) {
2250 if (err == -EINTR) {
2251 memcpy(&current->saved_sigmask, &sigsaved,
2252 sizeof(sigsaved));
4e4c22c7 2253 set_restore_sigmask();
f6dfb4fd
DL		 2254 } else
2255 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2256 }
2257
2258 return err;
2259}
f3de272b 2260#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2261
2262#endif /* CONFIG_EPOLL */
6d18c922
DL		 2263
2264#ifdef CONFIG_SIGNALFD
2265
9deb27ba
UD		 2266asmlinkage long compat_sys_signalfd4(int ufd,
2267 const compat_sigset_t __user *sigmask,
2268 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2269{
2270 compat_sigset_t ss32;
2271 sigset_t tmp;
2272 sigset_t __user *ksigmask;
2273
2274 if (sigsetsize != sizeof(compat_sigset_t))
2275 return -EINVAL;
2276 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2277 return -EFAULT;
2278 sigset_from_compat(&tmp, &ss32);
2279 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2280 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2281 return -EFAULT;
2282
9deb27ba 2283 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2284}
2285
9deb27ba
UD		 2286asmlinkage long compat_sys_signalfd(int ufd,
2287 const compat_sigset_t __user *sigmask,
2288 compat_size_t sigsetsize)
2289{
2290 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2291}
6d18c922
DL		 2292#endif /* CONFIG_SIGNALFD */
2293
83f5d126
DL		 2294#ifdef CONFIG_TIMERFD
2295
4d672e7a
DL		 2296asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2297 const struct compat_itimerspec __user *utmr,
2298 struct compat_itimerspec __user *otmr)
83f5d126 2299{
4d672e7a 2300 int error;
83f5d126
DL		 2301 struct itimerspec t;
2302 struct itimerspec __user *ut;
2303
83f5d126 2304 if (get_compat_itimerspec(&t, utmr))
8317f14b 2305 return -EFAULT;
4d672e7a
DL		 2306 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2307 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2308 return -EFAULT;
4d672e7a
DL		 2309 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2310 if (!error && otmr)
2311 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2312 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2313
2314 return error;
2315}
2316
2317asmlinkage long compat_sys_timerfd_gettime(int ufd,
2318 struct compat_itimerspec __user *otmr)
2319{
2320 int error;
2321 struct itimerspec t;
2322 struct itimerspec __user *ut;
83f5d126 2323
4d672e7a
DL		 2324 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2325 error = sys_timerfd_gettime(ufd, ut);
2326 if (!error)
2327 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2328 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2329
2330 return error;
83f5d126
DL		 2331}
2332
2333#endif /* CONFIG_TIMERFD */
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