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Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.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
a2531293 11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
1da177e4
LT		 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
85c9fe8f 18#include <linux/stddef.h>
022a1692 19#include <linux/kernel.h>
1da177e4
LT		 20#include <linux/linkage.h>
21#include <linux/compat.h>
22#include <linux/errno.h>
23#include <linux/time.h>
24#include <linux/fs.h>
25#include <linux/fcntl.h>
26#include <linux/namei.h>
27#include <linux/file.h>
9f3acc31 28#include <linux/fdtable.h>
1da177e4 29#include <linux/vfs.h>
1da177e4
LT		 30#include <linux/ioctl.h>
31#include <linux/init.h>
1da177e4 32#include <linux/ncp_mount.h>
9a9947bf 33#include <linux/nfs4_mount.h>
1da177e4
LT		 34#include <linux/syscalls.h>
35#include <linux/ctype.h>
36#include <linux/module.h>
37#include <linux/dirent.h>
0eeca283 38#include <linux/fsnotify.h>
1da177e4 39#include <linux/highuid.h>
1da177e4
LT		 40#include <linux/nfsd/syscall.h>
41#include <linux/personality.h>
42#include <linux/rwsem.h>
8f0ab514 43#include <linux/tsacct_kern.h>
6272e266 44#include <linux/security.h>
a1f8e7f7 45#include <linux/highmem.h>
6d18c922 46#include <linux/signal.h>
bd01f843 47#include <linux/poll.h>
4a805e86 48#include <linux/mm.h>
f6dfb4fd 49#include <linux/eventpoll.h>
498052bb 50#include <linux/fs_struct.h>
5a0e3ad6 51#include <linux/slab.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 */
c7887325
DH		 78asmlinkage long compat_sys_utime(const char __user *filename,
79 struct compat_utimbuf __user *t)
1da177e4 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
c7887325 93asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
1c710c89
UD		 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
c7887325 108asmlinkage long compat_sys_futimesat(unsigned int dfd, const 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
c7887325 127asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
5590ff0d
UD		 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
c7887325 171asmlinkage long compat_sys_newstat(const char __user * filename,
1da177e4
LT		 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
c7887325 183asmlinkage long compat_sys_newlstat(const char __user * filename,
1da177e4
LT		 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
c7887325
DH		 196asmlinkage long compat_sys_newfstatat(unsigned int dfd,
197 const char __user *filename,
5590ff0d
UD		 198 struct compat_stat __user *statbuf, int flag)
199{
200 struct kstat stat;
0112fc22 201 int error;
5590ff0d 202
0112fc22
OD		 203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_compat_stat(&stat, statbuf);
5590ff0d 207}
82d821dd 208#endif
5590ff0d 209
1da177e4
LT		 210asmlinkage long compat_sys_newfstat(unsigned int fd,
211 struct compat_stat __user * statbuf)
212{
213 struct kstat stat;
214 int error = vfs_fstat(fd, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218 return error;
219}
220
221static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
222{
223
224 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 225 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
226 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 227 return -EOVERFLOW;
228 /* f_files and f_ffree may be -1; it's okay
229 * to stuff that into 32 bits */
230 if (kbuf->f_files != 0xffffffffffffffffULL
231 && (kbuf->f_files & 0xffffffff00000000ULL))
232 return -EOVERFLOW;
233 if (kbuf->f_ffree != 0xffffffffffffffffULL
234 && (kbuf->f_ffree & 0xffffffff00000000ULL))
235 return -EOVERFLOW;
236 }
237 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
238 __put_user(kbuf->f_type, &ubuf->f_type) ||
239 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
240 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
241 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
242 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
243 __put_user(kbuf->f_files, &ubuf->f_files) ||
244 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
245 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
246 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
247 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
248 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
249 __put_user(0, &ubuf->f_spare[0]) ||
250 __put_user(0, &ubuf->f_spare[1]) ||
251 __put_user(0, &ubuf->f_spare[2]) ||
252 __put_user(0, &ubuf->f_spare[3]) ||
253 __put_user(0, &ubuf->f_spare[4]))
254 return -EFAULT;
255 return 0;
256}
257
258/*
259 * The following statfs calls are copies of code from fs/open.c and
260 * should be checked against those from time to time
261 */
2d8f3038 262asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 263{
2d8f3038 264 struct path path;
1da177e4
LT		 265 int error;
266
2d8f3038 267 error = user_path(pathname, &path);
1da177e4
LT		 268 if (!error) {
269 struct kstatfs tmp;
ebabe9a9 270 error = vfs_statfs(&path, &tmp);
86e07ce7
DG		 271 if (!error)
272 error = put_compat_statfs(buf, &tmp);
2d8f3038 273 path_put(&path);
1da177e4
LT		 274 }
275 return error;
276}
277
278asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
279{
280 struct file * file;
281 struct kstatfs tmp;
282 int error;
283
284 error = -EBADF;
285 file = fget(fd);
286 if (!file)
287 goto out;
ebabe9a9 288 error = vfs_statfs(&file->f_path, &tmp);
86e07ce7
DG		 289 if (!error)
290 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 291 fput(file);
292out:
293 return error;
294}
295
296static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
297{
298 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 299 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
300 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 301 return -EOVERFLOW;
302 /* f_files and f_ffree may be -1; it's okay
303 * to stuff that into 32 bits */
304 if (kbuf->f_files != 0xffffffffffffffffULL
305 && (kbuf->f_files & 0xffffffff00000000ULL))
306 return -EOVERFLOW;
307 if (kbuf->f_ffree != 0xffffffffffffffffULL
308 && (kbuf->f_ffree & 0xffffffff00000000ULL))
309 return -EOVERFLOW;
310 }
311 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
312 __put_user(kbuf->f_type, &ubuf->f_type) ||
313 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
314 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
315 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
316 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
317 __put_user(kbuf->f_files, &ubuf->f_files) ||
318 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
319 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
320 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
321 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
322 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
323 return -EFAULT;
324 return 0;
325}
326
2d8f3038 327asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 328{
2d8f3038 329 struct path path;
1da177e4
LT		 330 int error;
331
332 if (sz != sizeof(*buf))
333 return -EINVAL;
334
2d8f3038 335 error = user_path(pathname, &path);
1da177e4
LT		 336 if (!error) {
337 struct kstatfs tmp;
ebabe9a9 338 error = vfs_statfs(&path, &tmp);
86e07ce7
DG		 339 if (!error)
340 error = put_compat_statfs64(buf, &tmp);
2d8f3038 341 path_put(&path);
1da177e4
LT		 342 }
343 return error;
344}
345
346asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
347{
348 struct file * file;
349 struct kstatfs tmp;
350 int error;
351
352 if (sz != sizeof(*buf))
353 return -EINVAL;
354
355 error = -EBADF;
356 file = fget(fd);
357 if (!file)
358 goto out;
ebabe9a9 359 error = vfs_statfs(&file->f_path, &tmp);
86e07ce7
DG		 360 if (!error)
361 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 362 fput(file);
363out:
364 return error;
365}
366
2b1c6bd7
CH		 367/*
368 * This is a copy of sys_ustat, just dealing with a structure layout.
369 * Given how simple this syscall is that apporach is more maintainable
370 * than the various conversion hacks.
371 */
372asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
373{
374 struct super_block *sb;
375 struct compat_ustat tmp;
376 struct kstatfs sbuf;
377 int err;
378
379 sb = user_get_super(new_decode_dev(dev));
380 if (!sb)
381 return -EINVAL;
ebabe9a9 382 err = statfs_by_dentry(sb->s_root, &sbuf);
2b1c6bd7
CH		 383 drop_super(sb);
384 if (err)
385 return err;
386
387 memset(&tmp, 0, sizeof(struct compat_ustat));
388 tmp.f_tfree = sbuf.f_bfree;
389 tmp.f_tinode = sbuf.f_ffree;
390 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
391 return -EFAULT;
392 return 0;
393}
394
1da177e4
LT		 395static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
396{
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405}
406
407static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
408{
409 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
410 __put_user(kfl->l_type, &ufl->l_type) ||
411 __put_user(kfl->l_whence, &ufl->l_whence) ||
412 __put_user(kfl->l_start, &ufl->l_start) ||
413 __put_user(kfl->l_len, &ufl->l_len) ||
414 __put_user(kfl->l_pid, &ufl->l_pid))
415 return -EFAULT;
416 return 0;
417}
418
419#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
420static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
421{
422 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
423 __get_user(kfl->l_type, &ufl->l_type) ||
424 __get_user(kfl->l_whence, &ufl->l_whence) ||
425 __get_user(kfl->l_start, &ufl->l_start) ||
426 __get_user(kfl->l_len, &ufl->l_len) ||
427 __get_user(kfl->l_pid, &ufl->l_pid))
428 return -EFAULT;
429 return 0;
430}
431#endif
432
433#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
434static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
435{
436 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
437 __put_user(kfl->l_type, &ufl->l_type) ||
438 __put_user(kfl->l_whence, &ufl->l_whence) ||
439 __put_user(kfl->l_start, &ufl->l_start) ||
440 __put_user(kfl->l_len, &ufl->l_len) ||
441 __put_user(kfl->l_pid, &ufl->l_pid))
442 return -EFAULT;
443 return 0;
444}
445#endif
446
447asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
448 unsigned long arg)
449{
450 mm_segment_t old_fs;
451 struct flock f;
452 long ret;
453
454 switch (cmd) {
455 case F_GETLK:
456 case F_SETLK:
457 case F_SETLKW:
458 ret = get_compat_flock(&f, compat_ptr(arg));
459 if (ret != 0)
460 break;
461 old_fs = get_fs();
462 set_fs(KERNEL_DS);
463 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
464 set_fs(old_fs);
465 if (cmd == F_GETLK && ret == 0) {
ff677f8d 466 /* GETLK was successful and we need to return the data...
2520f14c
N		 467 * but it needs to fit in the compat structure.
468 * l_start shouldn't be too big, unless the original
469 * start + end is greater than COMPAT_OFF_T_MAX, in which
470 * case the app was asking for trouble, so we return
471 * -EOVERFLOW in that case.
472 * l_len could be too big, in which case we just truncate it,
473 * and only allow the app to see that part of the conflicting
474 * lock that might make sense to it anyway
475 */
476
477 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 478 ret = -EOVERFLOW;
2520f14c
N		 479 if (f.l_len > COMPAT_OFF_T_MAX)
480 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 481 if (ret == 0)
482 ret = put_compat_flock(&f, compat_ptr(arg));
483 }
484 break;
485
486 case F_GETLK64:
487 case F_SETLK64:
488 case F_SETLKW64:
489 ret = get_compat_flock64(&f, compat_ptr(arg));
490 if (ret != 0)
491 break;
492 old_fs = get_fs();
493 set_fs(KERNEL_DS);
494 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
495 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
496 (unsigned long)&f);
497 set_fs(old_fs);
498 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 499 /* need to return lock information - see above for commentary */
500 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 501 ret = -EOVERFLOW;
2520f14c
N		 502 if (f.l_len > COMPAT_LOFF_T_MAX)
503 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 504 if (ret == 0)
505 ret = put_compat_flock64(&f, compat_ptr(arg));
506 }
507 break;
508
509 default:
510 ret = sys_fcntl(fd, cmd, arg);
511 break;
512 }
513 return ret;
514}
515
516asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
517 unsigned long arg)
518{
519 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
520 return -EINVAL;
521 return compat_sys_fcntl64(fd, cmd, arg);
522}
523
524asmlinkage long
525compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
526{
527 long ret;
528 aio_context_t ctx64;
529
530 mm_segment_t oldfs = get_fs();
531 if (unlikely(get_user(ctx64, ctx32p)))
532 return -EFAULT;
533
534 set_fs(KERNEL_DS);
535 /* The __user pointer cast is valid because of the set_fs() */
536 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
537 set_fs(oldfs);
538 /* truncating is ok because it's a user address */
539 if (!ret)
540 ret = put_user((u32) ctx64, ctx32p);
541 return ret;
542}
543
544asmlinkage long
545compat_sys_io_getevents(aio_context_t ctx_id,
546 unsigned long min_nr,
547 unsigned long nr,
548 struct io_event __user *events,
549 struct compat_timespec __user *timeout)
550{
551 long ret;
552 struct timespec t;
553 struct timespec __user *ut = NULL;
554
555 ret = -EFAULT;
556 if (unlikely(!access_ok(VERIFY_WRITE, events,
557 nr * sizeof(struct io_event))))
558 goto out;
559 if (timeout) {
560 if (get_compat_timespec(&t, timeout))
561 goto out;
562
563 ut = compat_alloc_user_space(sizeof(*ut));
564 if (copy_to_user(ut, &t, sizeof(t)) )
565 goto out;
566 }
567 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
568out:
569 return ret;
570}
571
b8373363
JM		 572/* A write operation does a read from user space and vice versa */
573#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
574
575ssize_t compat_rw_copy_check_uvector(int type,
576 const struct compat_iovec __user *uvector, unsigned long nr_segs,
577 unsigned long fast_segs, struct iovec *fast_pointer,
578 struct iovec **ret_pointer)
579{
580 compat_ssize_t tot_len;
581 struct iovec *iov = *ret_pointer = fast_pointer;
582 ssize_t ret = 0;
583 int seg;
584
585 /*
586 * SuS says "The readv() function *may* fail if the iovcnt argument
587 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
588 * traditionally returned zero for zero segments, so...
589 */
590 if (nr_segs == 0)
591 goto out;
592
593 ret = -EINVAL;
594 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
595 goto out;
596 if (nr_segs > fast_segs) {
597 ret = -ENOMEM;
598 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
599 if (iov == NULL) {
600 *ret_pointer = fast_pointer;
601 goto out;
602 }
603 }
604 *ret_pointer = iov;
605
606 /*
607 * Single unix specification:
608 * We should -EINVAL if an element length is not >= 0 and fitting an
609 * ssize_t. The total length is fitting an ssize_t
610 *
611 * Be careful here because iov_len is a size_t not an ssize_t
612 */
613 tot_len = 0;
614 ret = -EINVAL;
615 for (seg = 0; seg < nr_segs; seg++) {
616 compat_ssize_t tmp = tot_len;
617 compat_uptr_t buf;
618 compat_ssize_t len;
619
620 if (__get_user(len, &uvector->iov_len) ||
621 __get_user(buf, &uvector->iov_base)) {
622 ret = -EFAULT;
623 goto out;
624 }
625 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
626 goto out;
627 tot_len += len;
628 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
629 goto out;
7cbe1770 630 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
b8373363
JM		 631 ret = -EFAULT;
632 goto out;
633 }
634 iov->iov_base = compat_ptr(buf);
635 iov->iov_len = (compat_size_t) len;
636 uvector++;
637 iov++;
638 }
639 ret = tot_len;
640
641out:
642 return ret;
643}
644
1da177e4
LT		 645static inline long
646copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
647{
648 compat_uptr_t uptr;
649 int i;
650
651 for (i = 0; i < nr; ++i) {
652 if (get_user(uptr, ptr32 + i))
653 return -EFAULT;
654 if (put_user(compat_ptr(uptr), ptr64 + i))
655 return -EFAULT;
656 }
657 return 0;
658}
659
660#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
661
662asmlinkage long
663compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
664{
665 struct iocb __user * __user *iocb64;
666 long ret;
667
668 if (unlikely(nr < 0))
669 return -EINVAL;
670
671 if (nr > MAX_AIO_SUBMITS)
672 nr = MAX_AIO_SUBMITS;
673
674 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
675 ret = copy_iocb(nr, iocb, iocb64);
676 if (!ret)
9d85cba7 677 ret = do_io_submit(ctx_id, nr, iocb64, 1);
1da177e4
LT		 678 return ret;
679}
680
681struct compat_ncp_mount_data {
682 compat_int_t version;
683 compat_uint_t ncp_fd;
202e5979 684 __compat_uid_t mounted_uid;
1da177e4
LT		 685 compat_pid_t wdog_pid;
686 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
687 compat_uint_t time_out;
688 compat_uint_t retry_count;
689 compat_uint_t flags;
202e5979
SR		 690 __compat_uid_t uid;
691 __compat_gid_t gid;
1da177e4
LT		 692 compat_mode_t file_mode;
693 compat_mode_t dir_mode;
694};
695
696struct compat_ncp_mount_data_v4 {
697 compat_int_t version;
698 compat_ulong_t flags;
699 compat_ulong_t mounted_uid;
700 compat_long_t wdog_pid;
701 compat_uint_t ncp_fd;
702 compat_uint_t time_out;
703 compat_uint_t retry_count;
704 compat_ulong_t uid;
705 compat_ulong_t gid;
706 compat_ulong_t file_mode;
707 compat_ulong_t dir_mode;
708};
709
710static void *do_ncp_super_data_conv(void *raw_data)
711{
712 int version = *(unsigned int *)raw_data;
713
714 if (version == 3) {
715 struct compat_ncp_mount_data *c_n = raw_data;
716 struct ncp_mount_data *n = raw_data;
717
718 n->dir_mode = c_n->dir_mode;
719 n->file_mode = c_n->file_mode;
720 n->gid = c_n->gid;
721 n->uid = c_n->uid;
722 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
723 n->wdog_pid = c_n->wdog_pid;
724 n->mounted_uid = c_n->mounted_uid;
725 } else if (version == 4) {
726 struct compat_ncp_mount_data_v4 *c_n = raw_data;
727 struct ncp_mount_data_v4 *n = raw_data;
728
729 n->dir_mode = c_n->dir_mode;
730 n->file_mode = c_n->file_mode;
731 n->gid = c_n->gid;
732 n->uid = c_n->uid;
733 n->retry_count = c_n->retry_count;
734 n->time_out = c_n->time_out;
735 n->ncp_fd = c_n->ncp_fd;
736 n->wdog_pid = c_n->wdog_pid;
737 n->mounted_uid = c_n->mounted_uid;
738 n->flags = c_n->flags;
739 } else if (version != 5) {
740 return NULL;
741 }
742
743 return raw_data;
744}
745
1da177e4 746
9a9947bf
DH		 747struct compat_nfs_string {
748 compat_uint_t len;
5fc3e624 749 compat_uptr_t data;
9a9947bf
DH		 750};
751
752static inline void compat_nfs_string(struct nfs_string *dst,
753 struct compat_nfs_string *src)
754{
755 dst->data = compat_ptr(src->data);
756 dst->len = src->len;
757}
758
759struct compat_nfs4_mount_data_v1 {
760 compat_int_t version;
761 compat_int_t flags;
762 compat_int_t rsize;
763 compat_int_t wsize;
764 compat_int_t timeo;
765 compat_int_t retrans;
766 compat_int_t acregmin;
767 compat_int_t acregmax;
768 compat_int_t acdirmin;
769 compat_int_t acdirmax;
770 struct compat_nfs_string client_addr;
771 struct compat_nfs_string mnt_path;
772 struct compat_nfs_string hostname;
773 compat_uint_t host_addrlen;
5fc3e624 774 compat_uptr_t host_addr;
9a9947bf
DH		 775 compat_int_t proto;
776 compat_int_t auth_flavourlen;
5fc3e624 777 compat_uptr_t auth_flavours;
9a9947bf
DH		 778};
779
780static int do_nfs4_super_data_conv(void *raw_data)
781{
782 int version = *(compat_uint_t *) raw_data;
783
784 if (version == 1) {
785 struct compat_nfs4_mount_data_v1 *raw = raw_data;
786 struct nfs4_mount_data *real = raw_data;
787
788 /* copy the fields backwards */
789 real->auth_flavours = compat_ptr(raw->auth_flavours);
790 real->auth_flavourlen = raw->auth_flavourlen;
791 real->proto = raw->proto;
792 real->host_addr = compat_ptr(raw->host_addr);
793 real->host_addrlen = raw->host_addrlen;
794 compat_nfs_string(&real->hostname, &raw->hostname);
795 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
796 compat_nfs_string(&real->client_addr, &raw->client_addr);
797 real->acdirmax = raw->acdirmax;
798 real->acdirmin = raw->acdirmin;
799 real->acregmax = raw->acregmax;
800 real->acregmin = raw->acregmin;
801 real->retrans = raw->retrans;
802 real->timeo = raw->timeo;
803 real->wsize = raw->wsize;
804 real->rsize = raw->rsize;
805 real->flags = raw->flags;
806 real->version = raw->version;
807 }
9a9947bf
DH		 808
809 return 0;
810}
811
1da177e4 812#define NCPFS_NAME "ncpfs"
9a9947bf 813#define NFS4_NAME "nfs4"
1da177e4 814
c7887325
DH		 815asmlinkage long compat_sys_mount(const char __user * dev_name,
816 const char __user * dir_name,
817 const char __user * type, unsigned long flags,
818 const void __user * data)
1da177e4 819{
eca6f534 820 char *kernel_type;
1da177e4 821 unsigned long data_page;
eca6f534 822 char *kernel_dev;
1da177e4
LT		 823 char *dir_page;
824 int retval;
825
eca6f534 826 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 827 if (retval < 0)
828 goto out;
829
830 dir_page = getname(dir_name);
831 retval = PTR_ERR(dir_page);
832 if (IS_ERR(dir_page))
833 goto out1;
834
eca6f534 835 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 836 if (retval < 0)
837 goto out2;
838
eca6f534 839 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 840 if (retval < 0)
841 goto out3;
842
843 retval = -EINVAL;
844
eca6f534 845 if (kernel_type && data_page) {
2116b7a4 846 if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 847 do_ncp_super_data_conv((void *)data_page);
eca6f534 848 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 849 if (do_nfs4_super_data_conv((void *) data_page))
850 goto out4;
1da177e4
LT		 851 }
852 }
853
eca6f534 854 retval = do_mount(kernel_dev, dir_page, kernel_type,
1da177e4 855 flags, (void*)data_page);
1da177e4 856
9a9947bf 857 out4:
1da177e4
LT		 858 free_page(data_page);
859 out3:
eca6f534 860 kfree(kernel_dev);
1da177e4
LT		 861 out2:
862 putname(dir_page);
863 out1:
eca6f534 864 kfree(kernel_type);
1da177e4
LT		 865 out:
866 return retval;
867}
868
1da177e4
LT		 869struct compat_old_linux_dirent {
870 compat_ulong_t d_ino;
871 compat_ulong_t d_offset;
872 unsigned short d_namlen;
873 char d_name[1];
874};
875
876struct compat_readdir_callback {
877 struct compat_old_linux_dirent __user *dirent;
878 int result;
879};
880
881static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 882 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 883{
884 struct compat_readdir_callback *buf = __buf;
885 struct compat_old_linux_dirent __user *dirent;
afefdbb2 886 compat_ulong_t d_ino;
1da177e4
LT		 887
888 if (buf->result)
889 return -EINVAL;
afefdbb2 890 d_ino = ino;
8f3f655d
AV		 891 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
892 buf->result = -EOVERFLOW;
afefdbb2 893 return -EOVERFLOW;
8f3f655d 894 }
1da177e4
LT		 895 buf->result++;
896 dirent = buf->dirent;
897 if (!access_ok(VERIFY_WRITE, dirent,
898 (unsigned long)(dirent->d_name + namlen + 1) -
899 (unsigned long)dirent))
900 goto efault;
afefdbb2 901 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 902 __put_user(offset, &dirent->d_offset) ||
903 __put_user(namlen, &dirent->d_namlen) ||
904 __copy_to_user(dirent->d_name, name, namlen) ||
905 __put_user(0, dirent->d_name + namlen))
906 goto efault;
907 return 0;
908efault:
909 buf->result = -EFAULT;
910 return -EFAULT;
911}
912
913asmlinkage long compat_sys_old_readdir(unsigned int fd,
914 struct compat_old_linux_dirent __user *dirent, unsigned int count)
915{
916 int error;
917 struct file *file;
918 struct compat_readdir_callback buf;
919
920 error = -EBADF;
921 file = fget(fd);
922 if (!file)
923 goto out;
924
925 buf.result = 0;
926 buf.dirent = dirent;
927
928 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 929 if (buf.result)
1da177e4
LT		 930 error = buf.result;
931
932 fput(file);
933out:
934 return error;
935}
936
937struct compat_linux_dirent {
938 compat_ulong_t d_ino;
939 compat_ulong_t d_off;
940 unsigned short d_reclen;
941 char d_name[1];
942};
943
944struct compat_getdents_callback {
945 struct compat_linux_dirent __user *current_dir;
946 struct compat_linux_dirent __user *previous;
947 int count;
948 int error;
949};
950
951static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 952 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 953{
954 struct compat_linux_dirent __user * dirent;
955 struct compat_getdents_callback *buf = __buf;
afefdbb2 956 compat_ulong_t d_ino;
85c9fe8f
KW		 957 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
958 namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 959
960 buf->error = -EINVAL; /* only used if we fail.. */
961 if (reclen > buf->count)
962 return -EINVAL;
afefdbb2 963 d_ino = ino;
8f3f655d
AV		 964 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
965 buf->error = -EOVERFLOW;
afefdbb2 966 return -EOVERFLOW;
8f3f655d 967 }
1da177e4
LT		 968 dirent = buf->previous;
969 if (dirent) {
970 if (__put_user(offset, &dirent->d_off))
971 goto efault;
972 }
973 dirent = buf->current_dir;
afefdbb2 974 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 975 goto efault;
976 if (__put_user(reclen, &dirent->d_reclen))
977 goto efault;
978 if (copy_to_user(dirent->d_name, name, namlen))
979 goto efault;
980 if (__put_user(0, dirent->d_name + namlen))
981 goto efault;
982 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
983 goto efault;
984 buf->previous = dirent;
985 dirent = (void __user *)dirent + reclen;
986 buf->current_dir = dirent;
987 buf->count -= reclen;
988 return 0;
989efault:
990 buf->error = -EFAULT;
991 return -EFAULT;
992}
993
994asmlinkage long compat_sys_getdents(unsigned int fd,
995 struct compat_linux_dirent __user *dirent, unsigned int count)
996{
997 struct file * file;
998 struct compat_linux_dirent __user * lastdirent;
999 struct compat_getdents_callback buf;
1000 int error;
1001
1002 error = -EFAULT;
1003 if (!access_ok(VERIFY_WRITE, dirent, count))
1004 goto out;
1005
1006 error = -EBADF;
1007 file = fget(fd);
1008 if (!file)
1009 goto out;
1010
1011 buf.current_dir = dirent;
1012 buf.previous = NULL;
1013 buf.count = count;
1014 buf.error = 0;
1015
1016 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 1017 if (error >= 0)
1018 error = buf.error;
1da177e4
LT		 1019 lastdirent = buf.previous;
1020 if (lastdirent) {
1021 if (put_user(file->f_pos, &lastdirent->d_off))
1022 error = -EFAULT;
1023 else
1024 error = count - buf.count;
1025 }
1da177e4
LT		 1026 fput(file);
1027out:
1028 return error;
1029}
1030
1031#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 1032
1033struct compat_getdents_callback64 {
1034 struct linux_dirent64 __user *current_dir;
1035 struct linux_dirent64 __user *previous;
1036 int count;
1037 int error;
1038};
1039
1040static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 1041 u64 ino, unsigned int d_type)
1da177e4
LT		 1042{
1043 struct linux_dirent64 __user *dirent;
1044 struct compat_getdents_callback64 *buf = __buf;
85c9fe8f
KW		 1045 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1046 sizeof(u64));
1da177e4
LT		 1047 u64 off;
1048
1049 buf->error = -EINVAL; /* only used if we fail.. */
1050 if (reclen > buf->count)
1051 return -EINVAL;
1052 dirent = buf->previous;
1053
1054 if (dirent) {
1055 if (__put_user_unaligned(offset, &dirent->d_off))
1056 goto efault;
1057 }
1058 dirent = buf->current_dir;
1059 if (__put_user_unaligned(ino, &dirent->d_ino))
1060 goto efault;
1061 off = 0;
1062 if (__put_user_unaligned(off, &dirent->d_off))
1063 goto efault;
1064 if (__put_user(reclen, &dirent->d_reclen))
1065 goto efault;
1066 if (__put_user(d_type, &dirent->d_type))
1067 goto efault;
1068 if (copy_to_user(dirent->d_name, name, namlen))
1069 goto efault;
1070 if (__put_user(0, dirent->d_name + namlen))
1071 goto efault;
1072 buf->previous = dirent;
1073 dirent = (void __user *)dirent + reclen;
1074 buf->current_dir = dirent;
1075 buf->count -= reclen;
1076 return 0;
1077efault:
1078 buf->error = -EFAULT;
1079 return -EFAULT;
1080}
1081
1082asmlinkage long compat_sys_getdents64(unsigned int fd,
1083 struct linux_dirent64 __user * dirent, unsigned int count)
1084{
1085 struct file * file;
1086 struct linux_dirent64 __user * lastdirent;
1087 struct compat_getdents_callback64 buf;
1088 int error;
1089
1090 error = -EFAULT;
1091 if (!access_ok(VERIFY_WRITE, dirent, count))
1092 goto out;
1093
1094 error = -EBADF;
1095 file = fget(fd);
1096 if (!file)
1097 goto out;
1098
1099 buf.current_dir = dirent;
1100 buf.previous = NULL;
1101 buf.count = count;
1102 buf.error = 0;
1103
1104 error = vfs_readdir(file, compat_filldir64, &buf);
53c9c5c0
AV		 1105 if (error >= 0)
1106 error = buf.error;
1da177e4
LT		 1107 lastdirent = buf.previous;
1108 if (lastdirent) {
1109 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1110 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1111 error = -EFAULT;
1112 else
1113 error = count - buf.count;
1da177e4 1114 }
1da177e4
LT		 1115 fput(file);
1116out:
1117 return error;
1118}
1119#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1120
1121static ssize_t compat_do_readv_writev(int type, struct file *file,
1122 const struct compat_iovec __user *uvector,
1123 unsigned long nr_segs, loff_t *pos)
1124{
1da177e4
LT		 1125 compat_ssize_t tot_len;
1126 struct iovec iovstack[UIO_FASTIOV];
767b68e9 1127 struct iovec *iov = iovstack;
1da177e4 1128 ssize_t ret;
1da177e4
LT		 1129 io_fn_t fn;
1130 iov_fn_t fnv;
1131
1da177e4 1132 ret = -EINVAL;
1da177e4
LT		 1133 if (!file->f_op)
1134 goto out;
b8373363 1135
1da177e4
LT		 1136 ret = -EFAULT;
1137 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1138 goto out;
1139
b8373363
JM		 1140 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1141 UIO_FASTIOV, iovstack, &iov);
1da177e4
LT		 1142 if (tot_len == 0) {
1143 ret = 0;
1144 goto out;
1145 }
1146
1147 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1148 if (ret < 0)
1da177e4
LT		 1149 goto out;
1150
1151 fnv = NULL;
1152 if (type == READ) {
1153 fn = file->f_op->read;
ee0b3e67 1154 fnv = file->f_op->aio_read;
1da177e4
LT		 1155 } else {
1156 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1157 fnv = file->f_op->aio_write;
1da177e4
LT		 1158 }
1159
ee0b3e67
BP		 1160 if (fnv)
1161 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1162 pos, fnv);
1163 else
1164 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1165
1da177e4
LT		 1166out:
1167 if (iov != iovstack)
1168 kfree(iov);
0eeca283 1169 if ((ret + (type == READ)) > 0) {
0eeca283 1170 if (type == READ)
2a12a9d7 1171 fsnotify_access(file);
0eeca283 1172 else
2a12a9d7 1173 fsnotify_modify(file);
0eeca283 1174 }
1da177e4
LT		 1175 return ret;
1176}
1177
dac12138
GH		 1178static size_t compat_readv(struct file *file,
1179 const struct compat_iovec __user *vec,
1180 unsigned long vlen, loff_t *pos)
1da177e4 1181{
1da177e4
LT		 1182 ssize_t ret = -EBADF;
1183
1da177e4
LT		 1184 if (!(file->f_mode & FMODE_READ))
1185 goto out;
1186
1187 ret = -EINVAL;
ee0b3e67 1188 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1189 goto out;
1190
dac12138 1191 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1192
1193out:
ca8a5bd2
GH		 1194 if (ret > 0)
1195 add_rchar(current, ret);
1196 inc_syscr(current);
dac12138
GH		 1197 return ret;
1198}
1199
1200asmlinkage ssize_t
1201compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1202 unsigned long vlen)
1203{
1204 struct file *file;
10c7db27 1205 int fput_needed;
dac12138
GH		 1206 ssize_t ret;
1207
10c7db27 1208 file = fget_light(fd, &fput_needed);
dac12138
GH		 1209 if (!file)
1210 return -EBADF;
1211 ret = compat_readv(file, vec, vlen, &file->f_pos);
10c7db27 1212 fput_light(file, fput_needed);
1da177e4
LT		 1213 return ret;
1214}
1215
f3554f4b
GH		 1216asmlinkage ssize_t
1217compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1218 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1219{
1220 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1221 struct file *file;
10c7db27 1222 int fput_needed;
f3554f4b
GH		 1223 ssize_t ret;
1224
1225 if (pos < 0)
1226 return -EINVAL;
10c7db27 1227 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1228 if (!file)
1229 return -EBADF;
1230 ret = compat_readv(file, vec, vlen, &pos);
10c7db27 1231 fput_light(file, fput_needed);
f3554f4b
GH		 1232 return ret;
1233}
1234
6949a631
GH		 1235static size_t compat_writev(struct file *file,
1236 const struct compat_iovec __user *vec,
1237 unsigned long vlen, loff_t *pos)
1da177e4 1238{
1da177e4
LT		 1239 ssize_t ret = -EBADF;
1240
1da177e4
LT		 1241 if (!(file->f_mode & FMODE_WRITE))
1242 goto out;
1243
1244 ret = -EINVAL;
ee0b3e67 1245 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1246 goto out;
1247
6949a631 1248 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1da177e4
LT		 1249
1250out:
ca8a5bd2
GH		 1251 if (ret > 0)
1252 add_wchar(current, ret);
1253 inc_syscw(current);
6949a631
GH		 1254 return ret;
1255}
1256
1257asmlinkage ssize_t
1258compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1259 unsigned long vlen)
1260{
1261 struct file *file;
10c7db27 1262 int fput_needed;
6949a631
GH		 1263 ssize_t ret;
1264
10c7db27 1265 file = fget_light(fd, &fput_needed);
6949a631
GH		 1266 if (!file)
1267 return -EBADF;
1268 ret = compat_writev(file, vec, vlen, &file->f_pos);
10c7db27 1269 fput_light(file, fput_needed);
1da177e4
LT		 1270 return ret;
1271}
1272
f3554f4b
GH		 1273asmlinkage ssize_t
1274compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1275 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1276{
1277 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1278 struct file *file;
10c7db27 1279 int fput_needed;
f3554f4b
GH		 1280 ssize_t ret;
1281
1282 if (pos < 0)
1283 return -EINVAL;
10c7db27 1284 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1285 if (!file)
1286 return -EBADF;
1287 ret = compat_writev(file, vec, vlen, &pos);
10c7db27 1288 fput_light(file, fput_needed);
f3554f4b
GH		 1289 return ret;
1290}
1291
d2610202
AK		 1292asmlinkage long
1293compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1294 unsigned int nr_segs, unsigned int flags)
1295{
1296 unsigned i;
90cbad65 1297 struct iovec __user *iov;
98232d50 1298 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1299 return -EINVAL;
1300 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1301 for (i = 0; i < nr_segs; i++) {
1302 struct compat_iovec v;
1303 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1304 get_user(v.iov_len, &iov32[i].iov_len) ||
1305 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1306 put_user(v.iov_len, &iov[i].iov_len))
1307 return -EFAULT;
1308 }
1309 return sys_vmsplice(fd, iov, nr_segs, flags);
1310}
1311
e922efc3
MS		 1312/*
1313 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1314 * O_LARGEFILE flag.
1315 */
1316asmlinkage long
1317compat_sys_open(const char __user *filename, int flags, int mode)
1318{
5590ff0d
UD		 1319 return do_sys_open(AT_FDCWD, filename, flags, mode);
1320}
1321
1322/*
1323 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1324 * O_LARGEFILE flag.
1325 */
1326asmlinkage long
9ad11ab4 1327compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1328{
1329 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1330}
1331
1da177e4
LT		 1332/*
1333 * compat_count() counts the number of arguments/envelopes. It is basically
1334 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1335 * and envp pointers.
1336 */
1337static int compat_count(compat_uptr_t __user *argv, int max)
1338{
1339 int i = 0;
1340
1341 if (argv != NULL) {
1342 for (;;) {
1343 compat_uptr_t p;
1344
1345 if (get_user(p, argv))
1346 return -EFAULT;
1347 if (!p)
1348 break;
1349 argv++;
362e6663 1350 if (i++ >= max)
1da177e4
LT		 1351 return -E2BIG;
1352 }
1353 }
1354 return i;
1355}
1356
1357/*
1358 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1359 * except that it works with 32 bit argv and envp pointers.
1360 */
1361static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1362 struct linux_binprm *bprm)
1363{
1364 struct page *kmapped_page = NULL;
1365 char *kaddr = NULL;
b6a2fea3 1366 unsigned long kpos = 0;
1da177e4
LT		 1367 int ret;
1368
1369 while (argc-- > 0) {
1370 compat_uptr_t str;
1371 int len;
1372 unsigned long pos;
1373
1374 if (get_user(str, argv+argc) ||
b6a2fea3 1375 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1376 ret = -EFAULT;
1377 goto out;
1378 }
1379
b6a2fea3 1380 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1381 ret = -E2BIG;
1382 goto out;
1383 }
1384
b6a2fea3 1385 /* We're going to work our way backwords. */
1da177e4 1386 pos = bprm->p;
b6a2fea3
OW		 1387 str += len;
1388 bprm->p -= len;
1da177e4
LT		 1389
1390 while (len > 0) {
1da177e4 1391 int offset, bytes_to_copy;
1da177e4
LT		 1392
1393 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1394 if (offset == 0)
1395 offset = PAGE_SIZE;
1396
1397 bytes_to_copy = offset;
1398 if (bytes_to_copy > len)
1399 bytes_to_copy = len;
1400
1401 offset -= bytes_to_copy;
1402 pos -= bytes_to_copy;
1403 str -= bytes_to_copy;
1404 len -= bytes_to_copy;
1405
1406 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1407 struct page *page;
1408
1409#ifdef CONFIG_STACK_GROWSUP
1410 ret = expand_stack_downwards(bprm->vma, pos);
1411 if (ret < 0) {
1412 /* We've exceed the stack rlimit. */
1413 ret = -E2BIG;
1414 goto out;
1415 }
1416#endif
1417 ret = get_user_pages(current, bprm->mm, pos,
1418 1, 1, 1, &page, NULL);
1419 if (ret <= 0) {
1420 /* We've exceed the stack rlimit. */
1421 ret = -E2BIG;
1da177e4
LT		 1422 goto out;
1423 }
1da177e4 1424
b6a2fea3
OW		 1425 if (kmapped_page) {
1426 flush_kernel_dcache_page(kmapped_page);
1da177e4 1427 kunmap(kmapped_page);
b6a2fea3
OW		 1428 put_page(kmapped_page);
1429 }
1da177e4
LT		 1430 kmapped_page = page;
1431 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1432 kpos = pos & PAGE_MASK;
1433 flush_cache_page(bprm->vma, kpos,
1434 page_to_pfn(kmapped_page));
1da177e4 1435 }
b6a2fea3
OW		 1436 if (copy_from_user(kaddr+offset, compat_ptr(str),
1437 bytes_to_copy)) {
1da177e4
LT		 1438 ret = -EFAULT;
1439 goto out;
1440 }
1da177e4
LT		 1441 }
1442 }
1443 ret = 0;
1444out:
b6a2fea3
OW		 1445 if (kmapped_page) {
1446 flush_kernel_dcache_page(kmapped_page);
1da177e4 1447 kunmap(kmapped_page);
b6a2fea3 1448 put_page(kmapped_page);
1da177e4 1449 }
b6a2fea3 1450 return ret;
1da177e4
LT		 1451}
1452
1da177e4
LT		 1453/*
1454 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1455 * that it processes 32 bit argv and envp pointers.
1456 */
1457int compat_do_execve(char * filename,
1458 compat_uptr_t __user *argv,
1459 compat_uptr_t __user *envp,
1460 struct pt_regs * regs)
1461{
1462 struct linux_binprm *bprm;
1463 struct file *file;
53e9309e 1464 struct files_struct *displaced;
8c652f96 1465 bool clear_in_exec;
1da177e4 1466 int retval;
1da177e4 1467
53e9309e
HD		 1468 retval = unshare_files(&displaced);
1469 if (retval)
1470 goto out_ret;
1471
1da177e4 1472 retval = -ENOMEM;
11b0b5ab 1473 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1474 if (!bprm)
53e9309e 1475 goto out_files;
1da177e4 1476
a2a8474c
ON		 1477 retval = prepare_bprm_creds(bprm);
1478 if (retval)
a6f76f23 1479 goto out_free;
498052bb
AV		 1480
1481 retval = check_unsafe_exec(bprm);
8c652f96 1482 if (retval < 0)
a2a8474c 1483 goto out_free;
8c652f96 1484 clear_in_exec = retval;
a2a8474c 1485 current->in_execve = 1;
a6f76f23 1486
1da177e4
LT		 1487 file = open_exec(filename);
1488 retval = PTR_ERR(file);
1489 if (IS_ERR(file))
498052bb 1490 goto out_unmark;
1da177e4
LT		 1491
1492 sched_exec();
1493
1da177e4
LT		 1494 bprm->file = file;
1495 bprm->filename = filename;
1496 bprm->interp = filename;
1da177e4 1497
b6a2fea3
OW		 1498 retval = bprm_mm_init(bprm);
1499 if (retval)
1500 goto out_file;
1da177e4 1501
b6a2fea3 1502 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1503 if ((retval = bprm->argc) < 0)
a6f76f23 1504 goto out;
1da177e4 1505
b6a2fea3 1506 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1507 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1508 goto out;
1509
1510 retval = prepare_binprm(bprm);
1511 if (retval < 0)
1512 goto out;
1513
1514 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1515 if (retval < 0)
1516 goto out;
1517
1518 bprm->exec = bprm->p;
1519 retval = compat_copy_strings(bprm->envc, envp, bprm);
1520 if (retval < 0)
1521 goto out;
1522
1523 retval = compat_copy_strings(bprm->argc, argv, bprm);
1524 if (retval < 0)
1525 goto out;
1526
1527 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1528 if (retval < 0)
1529 goto out;
1da177e4 1530
a6f76f23 1531 /* execve succeeded */
498052bb 1532 current->fs->in_exec = 0;
f9ce1f1c 1533 current->in_execve = 0;
a6f76f23
DH		 1534 acct_update_integrals(current);
1535 free_bprm(bprm);
53e9309e
HD		 1536 if (displaced)
1537 put_files_struct(displaced);
a6f76f23 1538 return retval;
1da177e4 1539
a6f76f23 1540out:
1da177e4 1541 if (bprm->mm)
b6a2fea3 1542 mmput(bprm->mm);
1da177e4
LT		 1543
1544out_file:
1545 if (bprm->file) {
1546 allow_write_access(bprm->file);
1547 fput(bprm->file);
1548 }
1549
498052bb 1550out_unmark:
8c652f96
ON		 1551 if (clear_in_exec)
1552 current->fs->in_exec = 0;
f9ce1f1c 1553 current->in_execve = 0;
a6f76f23
DH		 1554
1555out_free:
08a6fac1 1556 free_bprm(bprm);
1da177e4 1557
53e9309e
HD		 1558out_files:
1559 if (displaced)
1560 reset_files_struct(displaced);
1da177e4
LT		 1561out_ret:
1562 return retval;
1563}
1564
1565#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1566
b773ad40
TG		 1567static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1568 int timeval, int ret)
1569{
1570 struct timespec ts;
1571
1572 if (!p)
1573 return ret;
1574
1575 if (current->personality & STICKY_TIMEOUTS)
1576 goto sticky;
1577
1578 /* No update for zero timeout */
1579 if (!end_time->tv_sec && !end_time->tv_nsec)
1580 return ret;
1581
1582 ktime_get_ts(&ts);
1583 ts = timespec_sub(*end_time, ts);
1584 if (ts.tv_sec < 0)
1585 ts.tv_sec = ts.tv_nsec = 0;
1586
1587 if (timeval) {
1588 struct compat_timeval rtv;
1589
1590 rtv.tv_sec = ts.tv_sec;
1591 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1592
1593 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1594 return ret;
1595 } else {
1596 struct compat_timespec rts;
1597
1598 rts.tv_sec = ts.tv_sec;
1599 rts.tv_nsec = ts.tv_nsec;
1600
1601 if (!copy_to_user(p, &rts, sizeof(rts)))
1602 return ret;
1603 }
1604 /*
1605 * If an application puts its timeval in read-only memory, we
1606 * don't want the Linux-specific update to the timeval to
1607 * cause a fault after the select has completed
1608 * successfully. However, because we're not updating the
1609 * timeval, we can't restart the system call.
1610 */
1611
1612sticky:
1613 if (ret == -ERESTARTNOHAND)
1614 ret = -EINTR;
1615 return ret;
1616}
1617
1da177e4
LT		 1618/*
1619 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1620 * 64-bit unsigned longs.
1621 */
858119e1 1622static
1da177e4
LT		 1623int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1624 unsigned long *fdset)
1625{
022a1692 1626 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1627 if (ufdset) {
1628 unsigned long odd;
1629
1630 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1631 return -EFAULT;
1632
1633 odd = nr & 1UL;
1634 nr &= ~1UL;
1635 while (nr) {
1636 unsigned long h, l;
7116e994
HC		 1637 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1638 return -EFAULT;
1da177e4
LT		 1639 ufdset += 2;
1640 *fdset++ = h << 32 | l;
1641 nr -= 2;
1642 }
7116e994
HC		 1643 if (odd && __get_user(*fdset, ufdset))
1644 return -EFAULT;
1da177e4
LT		 1645 } else {
1646 /* Tricky, must clear full unsigned long in the
1647 * kernel fdset at the end, this makes sure that
1648 * actually happens.
1649 */
1650 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1651 }
1652 return 0;
1653}
1654
858119e1 1655static
7116e994
HC		 1656int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1657 unsigned long *fdset)
1da177e4
LT		 1658{
1659 unsigned long odd;
022a1692 1660 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1661
1662 if (!ufdset)
7116e994 1663 return 0;
1da177e4
LT		 1664
1665 odd = nr & 1UL;
1666 nr &= ~1UL;
1667 while (nr) {
1668 unsigned long h, l;
1669 l = *fdset++;
1670 h = l >> 32;
7116e994
HC		 1671 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1672 return -EFAULT;
1da177e4
LT		 1673 ufdset += 2;
1674 nr -= 2;
1675 }
7116e994
HC		 1676 if (odd && __put_user(*fdset, ufdset))
1677 return -EFAULT;
1678 return 0;
1da177e4
LT		 1679}
1680
1681
1682/*
1683 * This is a virtual copy of sys_select from fs/select.c and probably
1684 * should be compared to it from time to time
1685 */
1da177e4
LT		 1686
1687/*
1688 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1689 * like to be certain this leads to no problems. So I return
1690 * EINTR just for safety.
1691 *
1692 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1693 * I'm trying ERESTARTNOHAND which restart only when you want to.
1694 */
1695#define MAX_SELECT_SECONDS \
1696 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1697
9f72949f 1698int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1699 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1700 struct timespec *end_time)
1da177e4
LT		 1701{
1702 fd_set_bits fds;
6087b2da 1703 void *bits;
bbea9f69 1704 int size, max_fds, ret = -EINVAL;
a4531edd 1705 struct fdtable *fdt;
6087b2da 1706 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1707
1da177e4
LT		 1708 if (n < 0)
1709 goto out_nofds;
1710
bbea9f69 1711 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1712 rcu_read_lock();
a4531edd 1713 fdt = files_fdtable(current->files);
bbea9f69 1714 max_fds = fdt->max_fds;
ac5b8b6f 1715 rcu_read_unlock();
bbea9f69
VL		 1716 if (n > max_fds)
1717 n = max_fds;
1da177e4
LT		 1718
1719 /*
1720 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1721 * since we used fdset we need to allocate memory in units of
1722 * long-words.
1723 */
1da177e4 1724 size = FDS_BYTES(n);
6087b2da
BP		 1725 bits = stack_fds;
1726 if (size > sizeof(stack_fds) / 6) {
1727 bits = kmalloc(6 * size, GFP_KERNEL);
1728 ret = -ENOMEM;
1729 if (!bits)
1730 goto out_nofds;
1731 }
1da177e4
LT		 1732 fds.in = (unsigned long *) bits;
1733 fds.out = (unsigned long *) (bits + size);
1734 fds.ex = (unsigned long *) (bits + 2*size);
1735 fds.res_in = (unsigned long *) (bits + 3*size);
1736 fds.res_out = (unsigned long *) (bits + 4*size);
1737 fds.res_ex = (unsigned long *) (bits + 5*size);
1738
1739 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1740 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1741 (ret = compat_get_fd_set(n, exp, fds.ex)))
1742 goto out;
1743 zero_fd_set(n, fds.res_in);
1744 zero_fd_set(n, fds.res_out);
1745 zero_fd_set(n, fds.res_ex);
1746
8ff3e8e8 1747 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1748
1749 if (ret < 0)
1750 goto out;
1751 if (!ret) {
1752 ret = -ERESTARTNOHAND;
1753 if (signal_pending(current))
1754 goto out;
1755 ret = 0;
1756 }
1757
7116e994
HC		 1758 if (compat_set_fd_set(n, inp, fds.res_in) ||
1759 compat_set_fd_set(n, outp, fds.res_out) ||
1760 compat_set_fd_set(n, exp, fds.res_ex))
1761 ret = -EFAULT;
1da177e4 1762out:
6087b2da
BP		 1763 if (bits != stack_fds)
1764 kfree(bits);
1da177e4
LT		 1765out_nofds:
1766 return ret;
1767}
1768
9f72949f
DW		 1769asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1770 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1771 struct compat_timeval __user *tvp)
1772{
8ff3e8e8 1773 struct timespec end_time, *to = NULL;
9f72949f
DW		 1774 struct compat_timeval tv;
1775 int ret;
1776
1777 if (tvp) {
1778 if (copy_from_user(&tv, tvp, sizeof(tv)))
1779 return -EFAULT;
1780
8ff3e8e8 1781 to = &end_time;
4d36a9e6
AV		 1782 if (poll_select_set_timeout(to,
1783 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1784 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1785 return -EINVAL;
9f72949f
DW		 1786 }
1787
8ff3e8e8
AV		 1788 ret = compat_core_sys_select(n, inp, outp, exp, to);
1789 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1790
1791 return ret;
1792}
1793
5d0e5283
CH		 1794struct compat_sel_arg_struct {
1795 compat_ulong_t n;
1796 compat_uptr_t inp;
1797 compat_uptr_t outp;
1798 compat_uptr_t exp;
1799 compat_uptr_t tvp;
1800};
1801
1802asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1803{
1804 struct compat_sel_arg_struct a;
1805
1806 if (copy_from_user(&a, arg, sizeof(a)))
1807 return -EFAULT;
1808 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1809 compat_ptr(a.exp), compat_ptr(a.tvp));
1810}
1811
f3de272b 1812#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1813static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1814 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1815 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1816 compat_size_t sigsetsize)
1817{
1818 compat_sigset_t ss32;
1819 sigset_t ksigmask, sigsaved;
9f72949f 1820 struct compat_timespec ts;
8ff3e8e8 1821 struct timespec end_time, *to = NULL;
9f72949f
DW		 1822 int ret;
1823
1824 if (tsp) {
1825 if (copy_from_user(&ts, tsp, sizeof(ts)))
1826 return -EFAULT;
1827
8ff3e8e8
AV		 1828 to = &end_time;
1829 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1830 return -EINVAL;
1831 }
1832
1833 if (sigmask) {
1834 if (sigsetsize != sizeof(compat_sigset_t))
1835 return -EINVAL;
1836 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1837 return -EFAULT;
1838 sigset_from_compat(&ksigmask, &ss32);
1839
1840 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1841 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1842 }
1843
8ff3e8e8
AV		 1844 ret = compat_core_sys_select(n, inp, outp, exp, to);
1845 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1846
1847 if (ret == -ERESTARTNOHAND) {
1848 /*
1849 * Don't restore the signal mask yet. Let do_signal() deliver
1850 * the signal on the way back to userspace, before the signal
1851 * mask is restored.
1852 */
1853 if (sigmask) {
1854 memcpy(&current->saved_sigmask, &sigsaved,
1855 sizeof(sigsaved));
4e4c22c7 1856 set_restore_sigmask();
9f72949f
DW		 1857 }
1858 } else if (sigmask)
1859 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1860
1861 return ret;
1862}
1863
1864asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1865 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1866 struct compat_timespec __user *tsp, void __user *sig)
1867{
1868 compat_size_t sigsetsize = 0;
1869 compat_uptr_t up = 0;
1870
1871 if (sig) {
1872 if (!access_ok(VERIFY_READ, sig,
1873 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1874 __get_user(up, (compat_uptr_t __user *)sig) ||
1875 __get_user(sigsetsize,
1876 (compat_size_t __user *)(sig+sizeof(up))))
1877 return -EFAULT;
1878 }
c9da9f21
HC		 1879 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1880 sigsetsize);
9f72949f
DW		 1881}
1882
1883asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1884 unsigned int nfds, struct compat_timespec __user *tsp,
1885 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1886{
1887 compat_sigset_t ss32;
1888 sigset_t ksigmask, sigsaved;
1889 struct compat_timespec ts;
8ff3e8e8 1890 struct timespec end_time, *to = NULL;
9f72949f
DW		 1891 int ret;
1892
1893 if (tsp) {
1894 if (copy_from_user(&ts, tsp, sizeof(ts)))
1895 return -EFAULT;
1896
8ff3e8e8
AV		 1897 to = &end_time;
1898 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1899 return -EINVAL;
9f72949f
DW		 1900 }
1901
1902 if (sigmask) {
3835a9bd 1903 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1904 return -EINVAL;
1905 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1906 return -EFAULT;
1907 sigset_from_compat(&ksigmask, &ss32);
1908
1909 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1910 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1911 }
1912
8ff3e8e8 1913 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1914
1915 /* We can restart this syscall, usually */
1916 if (ret == -EINTR) {
1917 /*
1918 * Don't restore the signal mask yet. Let do_signal() deliver
1919 * the signal on the way back to userspace, before the signal
1920 * mask is restored.
1921 */
1922 if (sigmask) {
1923 memcpy(&current->saved_sigmask, &sigsaved,
1924 sizeof(sigsaved));
4e4c22c7 1925 set_restore_sigmask();
9f72949f
DW		 1926 }
1927 ret = -ERESTARTNOHAND;
1928 } else if (sigmask)
1929 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1930
8ff3e8e8 1931 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1932
1933 return ret;
1934}
f3de272b 1935#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1936
1e140567 1937#if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
1da177e4
LT		 1938/* Stuff for NFS server syscalls... */
1939struct compat_nfsctl_svc {
1940 u16 svc32_port;
1941 s32 svc32_nthreads;
1942};
1943
1944struct compat_nfsctl_client {
1945 s8 cl32_ident[NFSCLNT_IDMAX+1];
1946 s32 cl32_naddr;
1947 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1948 s32 cl32_fhkeytype;
1949 s32 cl32_fhkeylen;
1950 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1951};
1952
1953struct compat_nfsctl_export {
1954 char ex32_client[NFSCLNT_IDMAX+1];
1955 char ex32_path[NFS_MAXPATHLEN+1];
1956 compat_dev_t ex32_dev;
1957 compat_ino_t ex32_ino;
1958 compat_int_t ex32_flags;
202e5979
SR		 1959 __compat_uid_t ex32_anon_uid;
1960 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1961};
1962
1963struct compat_nfsctl_fdparm {
1964 struct sockaddr gd32_addr;
1965 s8 gd32_path[NFS_MAXPATHLEN+1];
1966 compat_int_t gd32_version;
1967};
1968
1969struct compat_nfsctl_fsparm {
1970 struct sockaddr gd32_addr;
1971 s8 gd32_path[NFS_MAXPATHLEN+1];
1972 compat_int_t gd32_maxlen;
1973};
1974
1975struct compat_nfsctl_arg {
1976 compat_int_t ca32_version; /* safeguard */
1977 union {
1978 struct compat_nfsctl_svc u32_svc;
1979 struct compat_nfsctl_client u32_client;
1980 struct compat_nfsctl_export u32_export;
1981 struct compat_nfsctl_fdparm u32_getfd;
1982 struct compat_nfsctl_fsparm u32_getfs;
1983 } u;
1984#define ca32_svc u.u32_svc
1985#define ca32_client u.u32_client
1986#define ca32_export u.u32_export
1987#define ca32_getfd u.u32_getfd
1988#define ca32_getfs u.u32_getfs
1989};
1990
1991union compat_nfsctl_res {
1992 __u8 cr32_getfh[NFS_FHSIZE];
1993 struct knfsd_fh cr32_getfs;
1994};
1995
d64b1c87
LFS		 1996static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1997 struct compat_nfsctl_arg __user *arg)
1da177e4 1998{
d64b1c87
LFS		 1999 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2000 get_user(karg->ca_version, &arg->ca32_version) ||
2001 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2002 __get_user(karg->ca_svc.svc_nthreads,
2003 &arg->ca32_svc.svc32_nthreads))
2004 return -EFAULT;
2005 return 0;
1da177e4
LT		 2006}
2007
d64b1c87
LFS		 2008static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2009 struct compat_nfsctl_arg __user *arg)
1da177e4 2010{
d64b1c87
LFS		 2011 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2012 sizeof(arg->ca32_client)) ||
2013 get_user(karg->ca_version, &arg->ca32_version) ||
2014 __copy_from_user(&karg->ca_client.cl_ident[0],
2015 &arg->ca32_client.cl32_ident[0],
2016 NFSCLNT_IDMAX) ||
2017 __get_user(karg->ca_client.cl_naddr,
2018 &arg->ca32_client.cl32_naddr) ||
2019 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2020 &arg->ca32_client.cl32_addrlist[0],
2021 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2022 __get_user(karg->ca_client.cl_fhkeytype,
2023 &arg->ca32_client.cl32_fhkeytype) ||
2024 __get_user(karg->ca_client.cl_fhkeylen,
2025 &arg->ca32_client.cl32_fhkeylen) ||
2026 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2027 &arg->ca32_client.cl32_fhkey[0],
2028 NFSCLNT_KEYMAX))
2029 return -EFAULT;
1da177e4 2030
d64b1c87 2031 return 0;
1da177e4
LT		 2032}
2033
d64b1c87
LFS		 2034static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2035 struct compat_nfsctl_arg __user *arg)
1da177e4 2036{
d64b1c87
LFS		 2037 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2038 sizeof(arg->ca32_export)) ||
2039 get_user(karg->ca_version, &arg->ca32_version) ||
2040 __copy_from_user(&karg->ca_export.ex_client[0],
2041 &arg->ca32_export.ex32_client[0],
2042 NFSCLNT_IDMAX) ||
2043 __copy_from_user(&karg->ca_export.ex_path[0],
2044 &arg->ca32_export.ex32_path[0],
2045 NFS_MAXPATHLEN) ||
2046 __get_user(karg->ca_export.ex_dev,
2047 &arg->ca32_export.ex32_dev) ||
2048 __get_user(karg->ca_export.ex_ino,
2049 &arg->ca32_export.ex32_ino) ||
2050 __get_user(karg->ca_export.ex_flags,
2051 &arg->ca32_export.ex32_flags) ||
2052 __get_user(karg->ca_export.ex_anon_uid,
2053 &arg->ca32_export.ex32_anon_uid) ||
2054 __get_user(karg->ca_export.ex_anon_gid,
2055 &arg->ca32_export.ex32_anon_gid))
2056 return -EFAULT;
1da177e4
LT		 2057 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2058 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2059
d64b1c87 2060 return 0;
1da177e4
LT		 2061}
2062
d64b1c87
LFS		 2063static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2064 struct compat_nfsctl_arg __user *arg)
1da177e4 2065{
d64b1c87
LFS		 2066 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2067 sizeof(arg->ca32_getfd)) ||
2068 get_user(karg->ca_version, &arg->ca32_version) ||
2069 __copy_from_user(&karg->ca_getfd.gd_addr,
2070 &arg->ca32_getfd.gd32_addr,
2071 (sizeof(struct sockaddr))) ||
2072 __copy_from_user(&karg->ca_getfd.gd_path,
2073 &arg->ca32_getfd.gd32_path,
2074 (NFS_MAXPATHLEN+1)) ||
2075 __get_user(karg->ca_getfd.gd_version,
2076 &arg->ca32_getfd.gd32_version))
2077 return -EFAULT;
1da177e4 2078
d64b1c87 2079 return 0;
1da177e4
LT		 2080}
2081
d64b1c87
LFS		 2082static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2083 struct compat_nfsctl_arg __user *arg)
1da177e4 2084{
d64b1c87
LFS		 2085 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2086 get_user(karg->ca_version, &arg->ca32_version) ||
2087 __copy_from_user(&karg->ca_getfs.gd_addr,
2088 &arg->ca32_getfs.gd32_addr,
2089 (sizeof(struct sockaddr))) ||
2090 __copy_from_user(&karg->ca_getfs.gd_path,
2091 &arg->ca32_getfs.gd32_path,
2092 (NFS_MAXPATHLEN+1)) ||
2093 __get_user(karg->ca_getfs.gd_maxlen,
2094 &arg->ca32_getfs.gd32_maxlen))
2095 return -EFAULT;
1da177e4 2096
d64b1c87 2097 return 0;
1da177e4
LT		 2098}
2099
2100/* This really doesn't need translations, we are only passing
2101 * back a union which contains opaque nfs file handle data.
2102 */
d64b1c87
LFS		 2103static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2104 union compat_nfsctl_res __user *res)
1da177e4
LT		 2105{
2106 int err;
2107
2108 err = copy_to_user(res, kres, sizeof(*res));
2109
2110 return (err) ? -EFAULT : 0;
2111}
2112
d64b1c87
LFS		 2113asmlinkage long compat_sys_nfsservctl(int cmd,
2114 struct compat_nfsctl_arg __user *arg,
2115 union compat_nfsctl_res __user *res)
1da177e4
LT		 2116{
2117 struct nfsctl_arg *karg;
2118 union nfsctl_res *kres;
2119 mm_segment_t oldfs;
2120 int err;
2121
2122 karg = kmalloc(sizeof(*karg), GFP_USER);
2123 kres = kmalloc(sizeof(*kres), GFP_USER);
2124 if(!karg || !kres) {
2125 err = -ENOMEM;
2126 goto done;
2127 }
2128
2129 switch(cmd) {
2130 case NFSCTL_SVC:
2131 err = compat_nfs_svc_trans(karg, arg);
2132 break;
2133
2134 case NFSCTL_ADDCLIENT:
2135 err = compat_nfs_clnt_trans(karg, arg);
2136 break;
2137
2138 case NFSCTL_DELCLIENT:
2139 err = compat_nfs_clnt_trans(karg, arg);
2140 break;
2141
2142 case NFSCTL_EXPORT:
2143 case NFSCTL_UNEXPORT:
2144 err = compat_nfs_exp_trans(karg, arg);
2145 break;
2146
2147 case NFSCTL_GETFD:
2148 err = compat_nfs_getfd_trans(karg, arg);
2149 break;
2150
2151 case NFSCTL_GETFS:
2152 err = compat_nfs_getfs_trans(karg, arg);
2153 break;
2154
2155 default:
2156 err = -EINVAL;
57070d01 2157 break;
1da177e4
LT		 2158 }
2159
57070d01
PS		 2160 if (err)
2161 goto done;
2162
1da177e4
LT		 2163 oldfs = get_fs();
2164 set_fs(KERNEL_DS);
2165 /* The __user pointer casts are valid because of the set_fs() */
2166 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2167 set_fs(oldfs);
2168
2169 if (err)
2170 goto done;
2171
2172 if((cmd == NFSCTL_GETFD) ||
2173 (cmd == NFSCTL_GETFS))
2174 err = compat_nfs_getfh_res_trans(kres, res);
2175
2176done:
2177 kfree(karg);
2178 kfree(kres);
2179 return err;
2180}
2181#else /* !NFSD */
2182long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2183{
2184 return sys_ni_syscall();
2185}
2186#endif
f6dfb4fd
DL		 2187
2188#ifdef CONFIG_EPOLL
2189
f3de272b 2190#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2191asmlinkage long compat_sys_epoll_pwait(int epfd,
2192 struct compat_epoll_event __user *events,
2193 int maxevents, int timeout,
2194 const compat_sigset_t __user *sigmask,
2195 compat_size_t sigsetsize)
2196{
2197 long err;
2198 compat_sigset_t csigmask;
2199 sigset_t ksigmask, sigsaved;
2200
2201 /*
2202 * If the caller wants a certain signal mask to be set during the wait,
2203 * we apply it here.
2204 */
2205 if (sigmask) {
2206 if (sigsetsize != sizeof(compat_sigset_t))
2207 return -EINVAL;
2208 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2209 return -EFAULT;
2210 sigset_from_compat(&ksigmask, &csigmask);
2211 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2212 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2213 }
2214
f6dfb4fd 2215 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2216
2217 /*
2218 * If we changed the signal mask, we need to restore the original one.
2219 * In case we've got a signal while waiting, we do not restore the
2220 * signal mask yet, and we allow do_signal() to deliver the signal on
2221 * the way back to userspace, before the signal mask is restored.
2222 */
2223 if (sigmask) {
2224 if (err == -EINTR) {
2225 memcpy(&current->saved_sigmask, &sigsaved,
2226 sizeof(sigsaved));
4e4c22c7 2227 set_restore_sigmask();
f6dfb4fd
DL		 2228 } else
2229 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2230 }
2231
2232 return err;
2233}
f3de272b 2234#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2235
2236#endif /* CONFIG_EPOLL */
6d18c922
DL		 2237
2238#ifdef CONFIG_SIGNALFD
2239
9deb27ba
UD		 2240asmlinkage long compat_sys_signalfd4(int ufd,
2241 const compat_sigset_t __user *sigmask,
2242 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2243{
2244 compat_sigset_t ss32;
2245 sigset_t tmp;
2246 sigset_t __user *ksigmask;
2247
2248 if (sigsetsize != sizeof(compat_sigset_t))
2249 return -EINVAL;
2250 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2251 return -EFAULT;
2252 sigset_from_compat(&tmp, &ss32);
2253 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2254 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2255 return -EFAULT;
2256
9deb27ba 2257 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2258}
2259
9deb27ba
UD		 2260asmlinkage long compat_sys_signalfd(int ufd,
2261 const compat_sigset_t __user *sigmask,
2262 compat_size_t sigsetsize)
2263{
2264 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2265}
6d18c922
DL		 2266#endif /* CONFIG_SIGNALFD */
2267
83f5d126
DL		 2268#ifdef CONFIG_TIMERFD
2269
4d672e7a
DL		 2270asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2271 const struct compat_itimerspec __user *utmr,
2272 struct compat_itimerspec __user *otmr)
83f5d126 2273{
4d672e7a 2274 int error;
83f5d126
DL		 2275 struct itimerspec t;
2276 struct itimerspec __user *ut;
2277
83f5d126 2278 if (get_compat_itimerspec(&t, utmr))
8317f14b 2279 return -EFAULT;
4d672e7a
DL		 2280 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2281 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2282 return -EFAULT;
4d672e7a
DL		 2283 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2284 if (!error && otmr)
2285 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2286 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2287
2288 return error;
2289}
2290
2291asmlinkage long compat_sys_timerfd_gettime(int ufd,
2292 struct compat_itimerspec __user *otmr)
2293{
2294 int error;
2295 struct itimerspec t;
2296 struct itimerspec __user *ut;
83f5d126 2297
4d672e7a
DL		 2298 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2299 error = sys_timerfd_gettime(ufd, ut);
2300 if (!error)
2301 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2302 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2303
2304 return error;
83f5d126
DL		 2305}
2306
2307#endif /* CONFIG_TIMERFD */
kernel source for telekom puls (alcatel/mediatek)