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[linux-2.6-block.git] / fs / compat.c
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1da177e4
LT		 1/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
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
LT		 40#include <linux/highuid.h>
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/syscall.h>
44#include <linux/personality.h>
45#include <linux/rwsem.h>
8f0ab514 46#include <linux/tsacct_kern.h>
6272e266 47#include <linux/security.h>
a1f8e7f7 48#include <linux/highmem.h>
6d18c922 49#include <linux/signal.h>
bd01f843 50#include <linux/poll.h>
4a805e86 51#include <linux/mm.h>
f6dfb4fd 52#include <linux/eventpoll.h>
498052bb 53#include <linux/fs_struct.h>
1da177e4 54
1da177e4
LT		 55#include <asm/uaccess.h>
56#include <asm/mmu_context.h>
57#include <asm/ioctls.h>
07f3f05c 58#include "internal.h"
9f72949f 59
bebfa101
AK		 60int compat_log = 1;
61
62int compat_printk(const char *fmt, ...)
63{
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72}
73
ee0b3e67
BP		 74#include "read_write.h"
75
1da177e4
LT		 76/*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
81{
1c710c89 82 struct timespec tv[2];
1da177e4
LT		 83
84 if (t) {
85 if (get_user(tv[0].tv_sec, &t->actime) ||
86 get_user(tv[1].tv_sec, &t->modtime))
87 return -EFAULT;
1c710c89
UD		 88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
1da177e4 90 }
1c710c89
UD		 91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92}
93
94asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
95{
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
1c710c89
UD		 103 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
104 return 0;
105 }
106 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 107}
108
9ad11ab4 109asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4 110{
1c710c89 111 struct timespec tv[2];
1da177e4 112
9ad11ab4 113 if (t) {
1da177e4 114 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 115 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 116 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 117 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 118 return -EFAULT;
1c710c89
UD		 119 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
120 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
121 return -EINVAL;
122 tv[0].tv_nsec *= 1000;
123 tv[1].tv_nsec *= 1000;
9ad11ab4 124 }
1c710c89 125 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 126}
127
128asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
129{
130 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 131}
132
f7a5000f
CH		 133static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
134{
135 compat_ino_t ino = stat->ino;
136 typeof(ubuf->st_uid) uid = 0;
137 typeof(ubuf->st_gid) gid = 0;
138 int err;
139
140 SET_UID(uid, stat->uid);
141 SET_GID(gid, stat->gid);
142
143 if ((u64) stat->size > MAX_NON_LFS ||
144 !old_valid_dev(stat->dev) ||
145 !old_valid_dev(stat->rdev))
146 return -EOVERFLOW;
147 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
148 return -EOVERFLOW;
149
150 if (clear_user(ubuf, sizeof(*ubuf)))
151 return -EFAULT;
152
153 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
154 err |= __put_user(ino, &ubuf->st_ino);
155 err |= __put_user(stat->mode, &ubuf->st_mode);
156 err |= __put_user(stat->nlink, &ubuf->st_nlink);
157 err |= __put_user(uid, &ubuf->st_uid);
158 err |= __put_user(gid, &ubuf->st_gid);
159 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
160 err |= __put_user(stat->size, &ubuf->st_size);
161 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
162 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
163 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
164 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
165 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
166 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
167 err |= __put_user(stat->blksize, &ubuf->st_blksize);
168 err |= __put_user(stat->blocks, &ubuf->st_blocks);
169 return err;
170}
171
1da177e4
LT		 172asmlinkage long compat_sys_newstat(char __user * filename,
173 struct compat_stat __user *statbuf)
174{
175 struct kstat stat;
2eae7a18 176 int error;
1da177e4 177
2eae7a18
CH		 178 error = vfs_stat(filename, &stat);
179 if (error)
180 return error;
181 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 182}
183
184asmlinkage long compat_sys_newlstat(char __user * filename,
185 struct compat_stat __user *statbuf)
186{
187 struct kstat stat;
2eae7a18 188 int error;
1da177e4 189
2eae7a18
CH		 190 error = vfs_lstat(filename, &stat);
191 if (error)
192 return error;
193 return cp_compat_stat(&stat, statbuf);
1da177e4
LT		 194}
195
82d821dd 196#ifndef __ARCH_WANT_STAT64
9ad11ab4 197asmlinkage long compat_sys_newfstatat(unsigned int dfd, 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;
2d8f3038 270 error = vfs_statfs(path.dentry, &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;
0f7fc9e4 288 error = vfs_statfs(file->f_path.dentry, &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;
2d8f3038 338 error = vfs_statfs(path.dentry, &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;
0f7fc9e4 359 error = vfs_statfs(file->f_path.dentry, &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;
382 err = vfs_statfs(sb->s_root, &sbuf);
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
572static inline long
573copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
574{
575 compat_uptr_t uptr;
576 int i;
577
578 for (i = 0; i < nr; ++i) {
579 if (get_user(uptr, ptr32 + i))
580 return -EFAULT;
581 if (put_user(compat_ptr(uptr), ptr64 + i))
582 return -EFAULT;
583 }
584 return 0;
585}
586
587#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
588
589asmlinkage long
590compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
591{
592 struct iocb __user * __user *iocb64;
593 long ret;
594
595 if (unlikely(nr < 0))
596 return -EINVAL;
597
598 if (nr > MAX_AIO_SUBMITS)
599 nr = MAX_AIO_SUBMITS;
600
601 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
602 ret = copy_iocb(nr, iocb, iocb64);
603 if (!ret)
604 ret = sys_io_submit(ctx_id, nr, iocb64);
605 return ret;
606}
607
608struct compat_ncp_mount_data {
609 compat_int_t version;
610 compat_uint_t ncp_fd;
202e5979 611 __compat_uid_t mounted_uid;
1da177e4
LT		 612 compat_pid_t wdog_pid;
613 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
614 compat_uint_t time_out;
615 compat_uint_t retry_count;
616 compat_uint_t flags;
202e5979
SR		 617 __compat_uid_t uid;
618 __compat_gid_t gid;
1da177e4
LT		 619 compat_mode_t file_mode;
620 compat_mode_t dir_mode;
621};
622
623struct compat_ncp_mount_data_v4 {
624 compat_int_t version;
625 compat_ulong_t flags;
626 compat_ulong_t mounted_uid;
627 compat_long_t wdog_pid;
628 compat_uint_t ncp_fd;
629 compat_uint_t time_out;
630 compat_uint_t retry_count;
631 compat_ulong_t uid;
632 compat_ulong_t gid;
633 compat_ulong_t file_mode;
634 compat_ulong_t dir_mode;
635};
636
637static void *do_ncp_super_data_conv(void *raw_data)
638{
639 int version = *(unsigned int *)raw_data;
640
641 if (version == 3) {
642 struct compat_ncp_mount_data *c_n = raw_data;
643 struct ncp_mount_data *n = raw_data;
644
645 n->dir_mode = c_n->dir_mode;
646 n->file_mode = c_n->file_mode;
647 n->gid = c_n->gid;
648 n->uid = c_n->uid;
649 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
650 n->wdog_pid = c_n->wdog_pid;
651 n->mounted_uid = c_n->mounted_uid;
652 } else if (version == 4) {
653 struct compat_ncp_mount_data_v4 *c_n = raw_data;
654 struct ncp_mount_data_v4 *n = raw_data;
655
656 n->dir_mode = c_n->dir_mode;
657 n->file_mode = c_n->file_mode;
658 n->gid = c_n->gid;
659 n->uid = c_n->uid;
660 n->retry_count = c_n->retry_count;
661 n->time_out = c_n->time_out;
662 n->ncp_fd = c_n->ncp_fd;
663 n->wdog_pid = c_n->wdog_pid;
664 n->mounted_uid = c_n->mounted_uid;
665 n->flags = c_n->flags;
666 } else if (version != 5) {
667 return NULL;
668 }
669
670 return raw_data;
671}
672
673struct compat_smb_mount_data {
674 compat_int_t version;
202e5979
SR		 675 __compat_uid_t mounted_uid;
676 __compat_uid_t uid;
677 __compat_gid_t gid;
1da177e4
LT		 678 compat_mode_t file_mode;
679 compat_mode_t dir_mode;
680};
681
682static void *do_smb_super_data_conv(void *raw_data)
683{
684 struct smb_mount_data *s = raw_data;
685 struct compat_smb_mount_data *c_s = raw_data;
686
687 if (c_s->version != SMB_MOUNT_OLDVERSION)
688 goto out;
689 s->dir_mode = c_s->dir_mode;
690 s->file_mode = c_s->file_mode;
691 s->gid = c_s->gid;
692 s->uid = c_s->uid;
693 s->mounted_uid = c_s->mounted_uid;
694 out:
695 return raw_data;
696}
697
9a9947bf
DH		 698struct compat_nfs_string {
699 compat_uint_t len;
5fc3e624 700 compat_uptr_t data;
9a9947bf
DH		 701};
702
703static inline void compat_nfs_string(struct nfs_string *dst,
704 struct compat_nfs_string *src)
705{
706 dst->data = compat_ptr(src->data);
707 dst->len = src->len;
708}
709
710struct compat_nfs4_mount_data_v1 {
711 compat_int_t version;
712 compat_int_t flags;
713 compat_int_t rsize;
714 compat_int_t wsize;
715 compat_int_t timeo;
716 compat_int_t retrans;
717 compat_int_t acregmin;
718 compat_int_t acregmax;
719 compat_int_t acdirmin;
720 compat_int_t acdirmax;
721 struct compat_nfs_string client_addr;
722 struct compat_nfs_string mnt_path;
723 struct compat_nfs_string hostname;
724 compat_uint_t host_addrlen;
5fc3e624 725 compat_uptr_t host_addr;
9a9947bf
DH		 726 compat_int_t proto;
727 compat_int_t auth_flavourlen;
5fc3e624 728 compat_uptr_t auth_flavours;
9a9947bf
DH		 729};
730
731static int do_nfs4_super_data_conv(void *raw_data)
732{
733 int version = *(compat_uint_t *) raw_data;
734
735 if (version == 1) {
736 struct compat_nfs4_mount_data_v1 *raw = raw_data;
737 struct nfs4_mount_data *real = raw_data;
738
739 /* copy the fields backwards */
740 real->auth_flavours = compat_ptr(raw->auth_flavours);
741 real->auth_flavourlen = raw->auth_flavourlen;
742 real->proto = raw->proto;
743 real->host_addr = compat_ptr(raw->host_addr);
744 real->host_addrlen = raw->host_addrlen;
745 compat_nfs_string(&real->hostname, &raw->hostname);
746 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
747 compat_nfs_string(&real->client_addr, &raw->client_addr);
748 real->acdirmax = raw->acdirmax;
749 real->acdirmin = raw->acdirmin;
750 real->acregmax = raw->acregmax;
751 real->acregmin = raw->acregmin;
752 real->retrans = raw->retrans;
753 real->timeo = raw->timeo;
754 real->wsize = raw->wsize;
755 real->rsize = raw->rsize;
756 real->flags = raw->flags;
757 real->version = raw->version;
758 }
9a9947bf
DH		 759
760 return 0;
761}
762
1da177e4
LT		 763#define SMBFS_NAME "smbfs"
764#define NCPFS_NAME "ncpfs"
9a9947bf 765#define NFS4_NAME "nfs4"
1da177e4
LT		 766
767asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
768 char __user * type, unsigned long flags,
769 void __user * data)
770{
eca6f534 771 char *kernel_type;
1da177e4 772 unsigned long data_page;
eca6f534 773 char *kernel_dev;
1da177e4
LT		 774 char *dir_page;
775 int retval;
776
eca6f534 777 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 778 if (retval < 0)
779 goto out;
780
781 dir_page = getname(dir_name);
782 retval = PTR_ERR(dir_page);
783 if (IS_ERR(dir_page))
784 goto out1;
785
eca6f534 786 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 787 if (retval < 0)
788 goto out2;
789
eca6f534 790 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 791 if (retval < 0)
792 goto out3;
793
794 retval = -EINVAL;
795
eca6f534
VN		 796 if (kernel_type && data_page) {
797 if (!strcmp(kernel_type, SMBFS_NAME)) {
1da177e4 798 do_smb_super_data_conv((void *)data_page);
eca6f534 799 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 800 do_ncp_super_data_conv((void *)data_page);
eca6f534 801 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 802 if (do_nfs4_super_data_conv((void *) data_page))
803 goto out4;
1da177e4
LT		 804 }
805 }
806
eca6f534 807 retval = do_mount(kernel_dev, dir_page, kernel_type,
1da177e4 808 flags, (void*)data_page);
1da177e4 809
9a9947bf 810 out4:
1da177e4
LT		 811 free_page(data_page);
812 out3:
eca6f534 813 kfree(kernel_dev);
1da177e4
LT		 814 out2:
815 putname(dir_page);
816 out1:
eca6f534 817 kfree(kernel_type);
1da177e4
LT		 818 out:
819 return retval;
820}
821
822#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
1da177e4
LT		 823
824struct compat_old_linux_dirent {
825 compat_ulong_t d_ino;
826 compat_ulong_t d_offset;
827 unsigned short d_namlen;
828 char d_name[1];
829};
830
831struct compat_readdir_callback {
832 struct compat_old_linux_dirent __user *dirent;
833 int result;
834};
835
836static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 837 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 838{
839 struct compat_readdir_callback *buf = __buf;
840 struct compat_old_linux_dirent __user *dirent;
afefdbb2 841 compat_ulong_t d_ino;
1da177e4
LT		 842
843 if (buf->result)
844 return -EINVAL;
afefdbb2 845 d_ino = ino;
8f3f655d
AV		 846 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
847 buf->result = -EOVERFLOW;
afefdbb2 848 return -EOVERFLOW;
8f3f655d 849 }
1da177e4
LT		 850 buf->result++;
851 dirent = buf->dirent;
852 if (!access_ok(VERIFY_WRITE, dirent,
853 (unsigned long)(dirent->d_name + namlen + 1) -
854 (unsigned long)dirent))
855 goto efault;
afefdbb2 856 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 857 __put_user(offset, &dirent->d_offset) ||
858 __put_user(namlen, &dirent->d_namlen) ||
859 __copy_to_user(dirent->d_name, name, namlen) ||
860 __put_user(0, dirent->d_name + namlen))
861 goto efault;
862 return 0;
863efault:
864 buf->result = -EFAULT;
865 return -EFAULT;
866}
867
868asmlinkage long compat_sys_old_readdir(unsigned int fd,
869 struct compat_old_linux_dirent __user *dirent, unsigned int count)
870{
871 int error;
872 struct file *file;
873 struct compat_readdir_callback buf;
874
875 error = -EBADF;
876 file = fget(fd);
877 if (!file)
878 goto out;
879
880 buf.result = 0;
881 buf.dirent = dirent;
882
883 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 884 if (buf.result)
1da177e4
LT		 885 error = buf.result;
886
887 fput(file);
888out:
889 return error;
890}
891
892struct compat_linux_dirent {
893 compat_ulong_t d_ino;
894 compat_ulong_t d_off;
895 unsigned short d_reclen;
896 char d_name[1];
897};
898
899struct compat_getdents_callback {
900 struct compat_linux_dirent __user *current_dir;
901 struct compat_linux_dirent __user *previous;
902 int count;
903 int error;
904};
905
906static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 907 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 908{
909 struct compat_linux_dirent __user * dirent;
910 struct compat_getdents_callback *buf = __buf;
afefdbb2 911 compat_ulong_t d_ino;
022a1692 912 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 913
914 buf->error = -EINVAL; /* only used if we fail.. */
915 if (reclen > buf->count)
916 return -EINVAL;
afefdbb2 917 d_ino = ino;
8f3f655d
AV		 918 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
919 buf->error = -EOVERFLOW;
afefdbb2 920 return -EOVERFLOW;
8f3f655d 921 }
1da177e4
LT		 922 dirent = buf->previous;
923 if (dirent) {
924 if (__put_user(offset, &dirent->d_off))
925 goto efault;
926 }
927 dirent = buf->current_dir;
afefdbb2 928 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 929 goto efault;
930 if (__put_user(reclen, &dirent->d_reclen))
931 goto efault;
932 if (copy_to_user(dirent->d_name, name, namlen))
933 goto efault;
934 if (__put_user(0, dirent->d_name + namlen))
935 goto efault;
936 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
937 goto efault;
938 buf->previous = dirent;
939 dirent = (void __user *)dirent + reclen;
940 buf->current_dir = dirent;
941 buf->count -= reclen;
942 return 0;
943efault:
944 buf->error = -EFAULT;
945 return -EFAULT;
946}
947
948asmlinkage long compat_sys_getdents(unsigned int fd,
949 struct compat_linux_dirent __user *dirent, unsigned int count)
950{
951 struct file * file;
952 struct compat_linux_dirent __user * lastdirent;
953 struct compat_getdents_callback buf;
954 int error;
955
956 error = -EFAULT;
957 if (!access_ok(VERIFY_WRITE, dirent, count))
958 goto out;
959
960 error = -EBADF;
961 file = fget(fd);
962 if (!file)
963 goto out;
964
965 buf.current_dir = dirent;
966 buf.previous = NULL;
967 buf.count = count;
968 buf.error = 0;
969
970 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 971 if (error >= 0)
972 error = buf.error;
1da177e4
LT		 973 lastdirent = buf.previous;
974 if (lastdirent) {
975 if (put_user(file->f_pos, &lastdirent->d_off))
976 error = -EFAULT;
977 else
978 error = count - buf.count;
979 }
1da177e4
LT		 980 fput(file);
981out:
982 return error;
983}
984
985#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 986
987struct compat_getdents_callback64 {
988 struct linux_dirent64 __user *current_dir;
989 struct linux_dirent64 __user *previous;
990 int count;
991 int error;
992};
993
994static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 995 u64 ino, unsigned int d_type)
1da177e4
LT		 996{
997 struct linux_dirent64 __user *dirent;
998 struct compat_getdents_callback64 *buf = __buf;
999 int jj = NAME_OFFSET(dirent);
022a1692 1000 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1da177e4
LT		 1001 u64 off;
1002
1003 buf->error = -EINVAL; /* only used if we fail.. */
1004 if (reclen > buf->count)
1005 return -EINVAL;
1006 dirent = buf->previous;
1007
1008 if (dirent) {
1009 if (__put_user_unaligned(offset, &dirent->d_off))
1010 goto efault;
1011 }
1012 dirent = buf->current_dir;
1013 if (__put_user_unaligned(ino, &dirent->d_ino))
1014 goto efault;
1015 off = 0;
1016 if (__put_user_unaligned(off, &dirent->d_off))
1017 goto efault;
1018 if (__put_user(reclen, &dirent->d_reclen))
1019 goto efault;
1020 if (__put_user(d_type, &dirent->d_type))
1021 goto efault;
1022 if (copy_to_user(dirent->d_name, name, namlen))
1023 goto efault;
1024 if (__put_user(0, dirent->d_name + namlen))
1025 goto efault;
1026 buf->previous = dirent;
1027 dirent = (void __user *)dirent + reclen;
1028 buf->current_dir = dirent;
1029 buf->count -= reclen;
1030 return 0;
1031efault:
1032 buf->error = -EFAULT;
1033 return -EFAULT;
1034}
1035
1036asmlinkage long compat_sys_getdents64(unsigned int fd,
1037 struct linux_dirent64 __user * dirent, unsigned int count)
1038{
1039 struct file * file;
1040 struct linux_dirent64 __user * lastdirent;
1041 struct compat_getdents_callback64 buf;
1042 int error;
1043
1044 error = -EFAULT;
1045 if (!access_ok(VERIFY_WRITE, dirent, count))
1046 goto out;
1047
1048 error = -EBADF;
1049 file = fget(fd);
1050 if (!file)
1051 goto out;
1052
1053 buf.current_dir = dirent;
1054 buf.previous = NULL;
1055 buf.count = count;
1056 buf.error = 0;
1057
1058 error = vfs_readdir(file, compat_filldir64, &buf);
53c9c5c0
AV		 1059 if (error >= 0)
1060 error = buf.error;
1da177e4
LT		 1061 lastdirent = buf.previous;
1062 if (lastdirent) {
1063 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1064 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1065 error = -EFAULT;
1066 else
1067 error = count - buf.count;
1da177e4 1068 }
1da177e4
LT		 1069 fput(file);
1070out:
1071 return error;
1072}
1073#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1074
1075static ssize_t compat_do_readv_writev(int type, struct file *file,
1076 const struct compat_iovec __user *uvector,
1077 unsigned long nr_segs, loff_t *pos)
1078{
1da177e4
LT		 1079 compat_ssize_t tot_len;
1080 struct iovec iovstack[UIO_FASTIOV];
1081 struct iovec *iov=iovstack, *vector;
1082 ssize_t ret;
1083 int seg;
1084 io_fn_t fn;
1085 iov_fn_t fnv;
1086
1087 /*
1088 * SuS says "The readv() function *may* fail if the iovcnt argument
1089 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1090 * traditionally returned zero for zero segments, so...
1091 */
1092 ret = 0;
1093 if (nr_segs == 0)
1094 goto out;
1095
1096 /*
1097 * First get the "struct iovec" from user memory and
1098 * verify all the pointers
1099 */
1100 ret = -EINVAL;
1101 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1102 goto out;
1103 if (!file->f_op)
1104 goto out;
1105 if (nr_segs > UIO_FASTIOV) {
1106 ret = -ENOMEM;
1107 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1108 if (!iov)
1109 goto out;
1110 }
1111 ret = -EFAULT;
1112 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1113 goto out;
1114
1115 /*
1116 * Single unix specification:
1117 * We should -EINVAL if an element length is not >= 0 and fitting an
1118 * ssize_t. The total length is fitting an ssize_t
1119 *
1120 * Be careful here because iov_len is a size_t not an ssize_t
1121 */
1122 tot_len = 0;
1123 vector = iov;
1124 ret = -EINVAL;
1125 for (seg = 0 ; seg < nr_segs; seg++) {
1126 compat_ssize_t tmp = tot_len;
1127 compat_ssize_t len;
1128 compat_uptr_t buf;
1129
1130 if (__get_user(len, &uvector->iov_len) ||
1131 __get_user(buf, &uvector->iov_base)) {
1132 ret = -EFAULT;
1133 goto out;
1134 }
1135 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1136 goto out;
1137 tot_len += len;
1138 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1139 goto out;
1140 vector->iov_base = compat_ptr(buf);
1141 vector->iov_len = (compat_size_t) len;
1142 uvector++;
1143 vector++;
1144 }
1145 if (tot_len == 0) {
1146 ret = 0;
1147 goto out;
1148 }
1149
1150 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1151 if (ret < 0)
1da177e4
LT		 1152 goto out;
1153
1154 fnv = NULL;
1155 if (type == READ) {
1156 fn = file->f_op->read;
ee0b3e67 1157 fnv = file->f_op->aio_read;
1da177e4
LT		 1158 } else {
1159 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1160 fnv = file->f_op->aio_write;
1da177e4
LT		 1161 }
1162
ee0b3e67
BP		 1163 if (fnv)
1164 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1165 pos, fnv);
1166 else
1167 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1168
1da177e4
LT		 1169out:
1170 if (iov != iovstack)
1171 kfree(iov);
0eeca283 1172 if ((ret + (type == READ)) > 0) {
0f7fc9e4 1173 struct dentry *dentry = file->f_path.dentry;
0eeca283
RL		 1174 if (type == READ)
1175 fsnotify_access(dentry);
1176 else
1177 fsnotify_modify(dentry);
1178 }
1da177e4
LT		 1179 return ret;
1180}
1181
dac12138
GH		 1182static size_t compat_readv(struct file *file,
1183 const struct compat_iovec __user *vec,
1184 unsigned long vlen, loff_t *pos)
1da177e4 1185{
1da177e4
LT		 1186 ssize_t ret = -EBADF;
1187
1da177e4
LT		 1188 if (!(file->f_mode & FMODE_READ))
1189 goto out;
1190
1191 ret = -EINVAL;
ee0b3e67 1192 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1193 goto out;
1194
dac12138 1195 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1196
1197out:
ca8a5bd2
GH		 1198 if (ret > 0)
1199 add_rchar(current, ret);
1200 inc_syscr(current);
dac12138
GH		 1201 return ret;
1202}
1203
1204asmlinkage ssize_t
1205compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1206 unsigned long vlen)
1207{
1208 struct file *file;
10c7db27 1209 int fput_needed;
dac12138
GH		 1210 ssize_t ret;
1211
10c7db27 1212 file = fget_light(fd, &fput_needed);
dac12138
GH		 1213 if (!file)
1214 return -EBADF;
1215 ret = compat_readv(file, vec, vlen, &file->f_pos);
10c7db27 1216 fput_light(file, fput_needed);
1da177e4
LT		 1217 return ret;
1218}
1219
f3554f4b
GH		 1220asmlinkage ssize_t
1221compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1222 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1223{
1224 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1225 struct file *file;
10c7db27 1226 int fput_needed;
f3554f4b
GH		 1227 ssize_t ret;
1228
1229 if (pos < 0)
1230 return -EINVAL;
10c7db27 1231 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1232 if (!file)
1233 return -EBADF;
1234 ret = compat_readv(file, vec, vlen, &pos);
10c7db27 1235 fput_light(file, fput_needed);
f3554f4b
GH		 1236 return ret;
1237}
1238
6949a631
GH		 1239static size_t compat_writev(struct file *file,
1240 const struct compat_iovec __user *vec,
1241 unsigned long vlen, loff_t *pos)
1da177e4 1242{
1da177e4
LT		 1243 ssize_t ret = -EBADF;
1244
1da177e4
LT		 1245 if (!(file->f_mode & FMODE_WRITE))
1246 goto out;
1247
1248 ret = -EINVAL;
ee0b3e67 1249 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1250 goto out;
1251
6949a631 1252 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1da177e4
LT		 1253
1254out:
ca8a5bd2
GH		 1255 if (ret > 0)
1256 add_wchar(current, ret);
1257 inc_syscw(current);
6949a631
GH		 1258 return ret;
1259}
1260
1261asmlinkage ssize_t
1262compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1263 unsigned long vlen)
1264{
1265 struct file *file;
10c7db27 1266 int fput_needed;
6949a631
GH		 1267 ssize_t ret;
1268
10c7db27 1269 file = fget_light(fd, &fput_needed);
6949a631
GH		 1270 if (!file)
1271 return -EBADF;
1272 ret = compat_writev(file, vec, vlen, &file->f_pos);
10c7db27 1273 fput_light(file, fput_needed);
1da177e4
LT		 1274 return ret;
1275}
1276
f3554f4b
GH		 1277asmlinkage ssize_t
1278compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1279 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1280{
1281 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1282 struct file *file;
10c7db27 1283 int fput_needed;
f3554f4b
GH		 1284 ssize_t ret;
1285
1286 if (pos < 0)
1287 return -EINVAL;
10c7db27 1288 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1289 if (!file)
1290 return -EBADF;
1291 ret = compat_writev(file, vec, vlen, &pos);
10c7db27 1292 fput_light(file, fput_needed);
f3554f4b
GH		 1293 return ret;
1294}
1295
d2610202
AK		 1296asmlinkage long
1297compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1298 unsigned int nr_segs, unsigned int flags)
1299{
1300 unsigned i;
90cbad65 1301 struct iovec __user *iov;
98232d50 1302 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1303 return -EINVAL;
1304 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1305 for (i = 0; i < nr_segs; i++) {
1306 struct compat_iovec v;
1307 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1308 get_user(v.iov_len, &iov32[i].iov_len) ||
1309 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1310 put_user(v.iov_len, &iov[i].iov_len))
1311 return -EFAULT;
1312 }
1313 return sys_vmsplice(fd, iov, nr_segs, flags);
1314}
1315
e922efc3
MS		 1316/*
1317 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1318 * O_LARGEFILE flag.
1319 */
1320asmlinkage long
1321compat_sys_open(const char __user *filename, int flags, int mode)
1322{
5590ff0d
UD		 1323 return do_sys_open(AT_FDCWD, filename, flags, mode);
1324}
1325
1326/*
1327 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1328 * O_LARGEFILE flag.
1329 */
1330asmlinkage long
9ad11ab4 1331compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1332{
1333 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1334}
1335
1da177e4
LT		 1336/*
1337 * compat_count() counts the number of arguments/envelopes. It is basically
1338 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1339 * and envp pointers.
1340 */
1341static int compat_count(compat_uptr_t __user *argv, int max)
1342{
1343 int i = 0;
1344
1345 if (argv != NULL) {
1346 for (;;) {
1347 compat_uptr_t p;
1348
1349 if (get_user(p, argv))
1350 return -EFAULT;
1351 if (!p)
1352 break;
1353 argv++;
362e6663 1354 if (i++ >= max)
1da177e4
LT		 1355 return -E2BIG;
1356 }
1357 }
1358 return i;
1359}
1360
1361/*
1362 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1363 * except that it works with 32 bit argv and envp pointers.
1364 */
1365static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1366 struct linux_binprm *bprm)
1367{
1368 struct page *kmapped_page = NULL;
1369 char *kaddr = NULL;
b6a2fea3 1370 unsigned long kpos = 0;
1da177e4
LT		 1371 int ret;
1372
1373 while (argc-- > 0) {
1374 compat_uptr_t str;
1375 int len;
1376 unsigned long pos;
1377
1378 if (get_user(str, argv+argc) ||
b6a2fea3 1379 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1380 ret = -EFAULT;
1381 goto out;
1382 }
1383
b6a2fea3 1384 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1385 ret = -E2BIG;
1386 goto out;
1387 }
1388
b6a2fea3 1389 /* We're going to work our way backwords. */
1da177e4 1390 pos = bprm->p;
b6a2fea3
OW		 1391 str += len;
1392 bprm->p -= len;
1da177e4
LT		 1393
1394 while (len > 0) {
1da177e4 1395 int offset, bytes_to_copy;
1da177e4
LT		 1396
1397 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1398 if (offset == 0)
1399 offset = PAGE_SIZE;
1400
1401 bytes_to_copy = offset;
1402 if (bytes_to_copy > len)
1403 bytes_to_copy = len;
1404
1405 offset -= bytes_to_copy;
1406 pos -= bytes_to_copy;
1407 str -= bytes_to_copy;
1408 len -= bytes_to_copy;
1409
1410 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1411 struct page *page;
1412
1413#ifdef CONFIG_STACK_GROWSUP
1414 ret = expand_stack_downwards(bprm->vma, pos);
1415 if (ret < 0) {
1416 /* We've exceed the stack rlimit. */
1417 ret = -E2BIG;
1418 goto out;
1419 }
1420#endif
1421 ret = get_user_pages(current, bprm->mm, pos,
1422 1, 1, 1, &page, NULL);
1423 if (ret <= 0) {
1424 /* We've exceed the stack rlimit. */
1425 ret = -E2BIG;
1da177e4
LT		 1426 goto out;
1427 }
1da177e4 1428
b6a2fea3
OW		 1429 if (kmapped_page) {
1430 flush_kernel_dcache_page(kmapped_page);
1da177e4 1431 kunmap(kmapped_page);
b6a2fea3
OW		 1432 put_page(kmapped_page);
1433 }
1da177e4
LT		 1434 kmapped_page = page;
1435 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1436 kpos = pos & PAGE_MASK;
1437 flush_cache_page(bprm->vma, kpos,
1438 page_to_pfn(kmapped_page));
1da177e4 1439 }
b6a2fea3
OW		 1440 if (copy_from_user(kaddr+offset, compat_ptr(str),
1441 bytes_to_copy)) {
1da177e4
LT		 1442 ret = -EFAULT;
1443 goto out;
1444 }
1da177e4
LT		 1445 }
1446 }
1447 ret = 0;
1448out:
b6a2fea3
OW		 1449 if (kmapped_page) {
1450 flush_kernel_dcache_page(kmapped_page);
1da177e4 1451 kunmap(kmapped_page);
b6a2fea3 1452 put_page(kmapped_page);
1da177e4 1453 }
b6a2fea3 1454 return ret;
1da177e4
LT		 1455}
1456
1da177e4
LT		 1457/*
1458 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1459 * that it processes 32 bit argv and envp pointers.
1460 */
1461int compat_do_execve(char * filename,
1462 compat_uptr_t __user *argv,
1463 compat_uptr_t __user *envp,
1464 struct pt_regs * regs)
1465{
1466 struct linux_binprm *bprm;
1467 struct file *file;
53e9309e 1468 struct files_struct *displaced;
8c652f96 1469 bool clear_in_exec;
1da177e4 1470 int retval;
1da177e4 1471
53e9309e
HD		 1472 retval = unshare_files(&displaced);
1473 if (retval)
1474 goto out_ret;
1475
1da177e4 1476 retval = -ENOMEM;
11b0b5ab 1477 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1478 if (!bprm)
53e9309e 1479 goto out_files;
1da177e4 1480
a2a8474c
ON		 1481 retval = prepare_bprm_creds(bprm);
1482 if (retval)
a6f76f23 1483 goto out_free;
498052bb
AV		 1484
1485 retval = check_unsafe_exec(bprm);
8c652f96 1486 if (retval < 0)
a2a8474c 1487 goto out_free;
8c652f96 1488 clear_in_exec = retval;
a2a8474c 1489 current->in_execve = 1;
a6f76f23 1490
1da177e4
LT		 1491 file = open_exec(filename);
1492 retval = PTR_ERR(file);
1493 if (IS_ERR(file))
498052bb 1494 goto out_unmark;
1da177e4
LT		 1495
1496 sched_exec();
1497
1da177e4
LT		 1498 bprm->file = file;
1499 bprm->filename = filename;
1500 bprm->interp = filename;
1da177e4 1501
b6a2fea3
OW		 1502 retval = bprm_mm_init(bprm);
1503 if (retval)
1504 goto out_file;
1da177e4 1505
b6a2fea3 1506 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1507 if ((retval = bprm->argc) < 0)
a6f76f23 1508 goto out;
1da177e4 1509
b6a2fea3 1510 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1511 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1512 goto out;
1513
1514 retval = prepare_binprm(bprm);
1515 if (retval < 0)
1516 goto out;
1517
1518 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1519 if (retval < 0)
1520 goto out;
1521
1522 bprm->exec = bprm->p;
1523 retval = compat_copy_strings(bprm->envc, envp, bprm);
1524 if (retval < 0)
1525 goto out;
1526
1527 retval = compat_copy_strings(bprm->argc, argv, bprm);
1528 if (retval < 0)
1529 goto out;
1530
1531 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1532 if (retval < 0)
1533 goto out;
1da177e4 1534
89240ba0
SS		 1535 current->stack_start = current->mm->start_stack;
1536
a6f76f23 1537 /* execve succeeded */
498052bb 1538 current->fs->in_exec = 0;
f9ce1f1c 1539 current->in_execve = 0;
a6f76f23
DH		 1540 acct_update_integrals(current);
1541 free_bprm(bprm);
53e9309e
HD		 1542 if (displaced)
1543 put_files_struct(displaced);
a6f76f23 1544 return retval;
1da177e4 1545
a6f76f23 1546out:
1da177e4 1547 if (bprm->mm)
b6a2fea3 1548 mmput(bprm->mm);
1da177e4
LT		 1549
1550out_file:
1551 if (bprm->file) {
1552 allow_write_access(bprm->file);
1553 fput(bprm->file);
1554 }
1555
498052bb 1556out_unmark:
8c652f96
ON		 1557 if (clear_in_exec)
1558 current->fs->in_exec = 0;
f9ce1f1c 1559 current->in_execve = 0;
a6f76f23
DH		 1560
1561out_free:
08a6fac1 1562 free_bprm(bprm);
1da177e4 1563
53e9309e
HD		 1564out_files:
1565 if (displaced)
1566 reset_files_struct(displaced);
1da177e4
LT		 1567out_ret:
1568 return retval;
1569}
1570
1571#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1572
b773ad40
TG		 1573static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1574 int timeval, int ret)
1575{
1576 struct timespec ts;
1577
1578 if (!p)
1579 return ret;
1580
1581 if (current->personality & STICKY_TIMEOUTS)
1582 goto sticky;
1583
1584 /* No update for zero timeout */
1585 if (!end_time->tv_sec && !end_time->tv_nsec)
1586 return ret;
1587
1588 ktime_get_ts(&ts);
1589 ts = timespec_sub(*end_time, ts);
1590 if (ts.tv_sec < 0)
1591 ts.tv_sec = ts.tv_nsec = 0;
1592
1593 if (timeval) {
1594 struct compat_timeval rtv;
1595
1596 rtv.tv_sec = ts.tv_sec;
1597 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1598
1599 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1600 return ret;
1601 } else {
1602 struct compat_timespec rts;
1603
1604 rts.tv_sec = ts.tv_sec;
1605 rts.tv_nsec = ts.tv_nsec;
1606
1607 if (!copy_to_user(p, &rts, sizeof(rts)))
1608 return ret;
1609 }
1610 /*
1611 * If an application puts its timeval in read-only memory, we
1612 * don't want the Linux-specific update to the timeval to
1613 * cause a fault after the select has completed
1614 * successfully. However, because we're not updating the
1615 * timeval, we can't restart the system call.
1616 */
1617
1618sticky:
1619 if (ret == -ERESTARTNOHAND)
1620 ret = -EINTR;
1621 return ret;
1622}
1623
1da177e4
LT		 1624/*
1625 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1626 * 64-bit unsigned longs.
1627 */
858119e1 1628static
1da177e4
LT		 1629int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1630 unsigned long *fdset)
1631{
022a1692 1632 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1633 if (ufdset) {
1634 unsigned long odd;
1635
1636 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1637 return -EFAULT;
1638
1639 odd = nr & 1UL;
1640 nr &= ~1UL;
1641 while (nr) {
1642 unsigned long h, l;
7116e994
HC		 1643 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1644 return -EFAULT;
1da177e4
LT		 1645 ufdset += 2;
1646 *fdset++ = h << 32 | l;
1647 nr -= 2;
1648 }
7116e994
HC		 1649 if (odd && __get_user(*fdset, ufdset))
1650 return -EFAULT;
1da177e4
LT		 1651 } else {
1652 /* Tricky, must clear full unsigned long in the
1653 * kernel fdset at the end, this makes sure that
1654 * actually happens.
1655 */
1656 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1657 }
1658 return 0;
1659}
1660
858119e1 1661static
7116e994
HC		 1662int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1663 unsigned long *fdset)
1da177e4
LT		 1664{
1665 unsigned long odd;
022a1692 1666 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1667
1668 if (!ufdset)
7116e994 1669 return 0;
1da177e4
LT		 1670
1671 odd = nr & 1UL;
1672 nr &= ~1UL;
1673 while (nr) {
1674 unsigned long h, l;
1675 l = *fdset++;
1676 h = l >> 32;
7116e994
HC		 1677 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1678 return -EFAULT;
1da177e4
LT		 1679 ufdset += 2;
1680 nr -= 2;
1681 }
7116e994
HC		 1682 if (odd && __put_user(*fdset, ufdset))
1683 return -EFAULT;
1684 return 0;
1da177e4
LT		 1685}
1686
1687
1688/*
1689 * This is a virtual copy of sys_select from fs/select.c and probably
1690 * should be compared to it from time to time
1691 */
1da177e4
LT		 1692
1693/*
1694 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1695 * like to be certain this leads to no problems. So I return
1696 * EINTR just for safety.
1697 *
1698 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1699 * I'm trying ERESTARTNOHAND which restart only when you want to.
1700 */
1701#define MAX_SELECT_SECONDS \
1702 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1703
9f72949f 1704int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1705 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1706 struct timespec *end_time)
1da177e4
LT		 1707{
1708 fd_set_bits fds;
6087b2da 1709 void *bits;
bbea9f69 1710 int size, max_fds, ret = -EINVAL;
a4531edd 1711 struct fdtable *fdt;
6087b2da 1712 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1713
1da177e4
LT		 1714 if (n < 0)
1715 goto out_nofds;
1716
bbea9f69 1717 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1718 rcu_read_lock();
a4531edd 1719 fdt = files_fdtable(current->files);
bbea9f69 1720 max_fds = fdt->max_fds;
ac5b8b6f 1721 rcu_read_unlock();
bbea9f69
VL		 1722 if (n > max_fds)
1723 n = max_fds;
1da177e4
LT		 1724
1725 /*
1726 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1727 * since we used fdset we need to allocate memory in units of
1728 * long-words.
1729 */
1da177e4 1730 size = FDS_BYTES(n);
6087b2da
BP		 1731 bits = stack_fds;
1732 if (size > sizeof(stack_fds) / 6) {
1733 bits = kmalloc(6 * size, GFP_KERNEL);
1734 ret = -ENOMEM;
1735 if (!bits)
1736 goto out_nofds;
1737 }
1da177e4
LT		 1738 fds.in = (unsigned long *) bits;
1739 fds.out = (unsigned long *) (bits + size);
1740 fds.ex = (unsigned long *) (bits + 2*size);
1741 fds.res_in = (unsigned long *) (bits + 3*size);
1742 fds.res_out = (unsigned long *) (bits + 4*size);
1743 fds.res_ex = (unsigned long *) (bits + 5*size);
1744
1745 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1746 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1747 (ret = compat_get_fd_set(n, exp, fds.ex)))
1748 goto out;
1749 zero_fd_set(n, fds.res_in);
1750 zero_fd_set(n, fds.res_out);
1751 zero_fd_set(n, fds.res_ex);
1752
8ff3e8e8 1753 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1754
1755 if (ret < 0)
1756 goto out;
1757 if (!ret) {
1758 ret = -ERESTARTNOHAND;
1759 if (signal_pending(current))
1760 goto out;
1761 ret = 0;
1762 }
1763
7116e994
HC		 1764 if (compat_set_fd_set(n, inp, fds.res_in) ||
1765 compat_set_fd_set(n, outp, fds.res_out) ||
1766 compat_set_fd_set(n, exp, fds.res_ex))
1767 ret = -EFAULT;
1da177e4 1768out:
6087b2da
BP		 1769 if (bits != stack_fds)
1770 kfree(bits);
1da177e4
LT		 1771out_nofds:
1772 return ret;
1773}
1774
9f72949f
DW		 1775asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1776 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1777 struct compat_timeval __user *tvp)
1778{
8ff3e8e8 1779 struct timespec end_time, *to = NULL;
9f72949f
DW		 1780 struct compat_timeval tv;
1781 int ret;
1782
1783 if (tvp) {
1784 if (copy_from_user(&tv, tvp, sizeof(tv)))
1785 return -EFAULT;
1786
8ff3e8e8 1787 to = &end_time;
4d36a9e6
AV		 1788 if (poll_select_set_timeout(to,
1789 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1790 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1791 return -EINVAL;
9f72949f
DW		 1792 }
1793
8ff3e8e8
AV		 1794 ret = compat_core_sys_select(n, inp, outp, exp, to);
1795 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1796
1797 return ret;
1798}
1799
f3de272b 1800#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1801static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1802 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1803 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1804 compat_size_t sigsetsize)
1805{
1806 compat_sigset_t ss32;
1807 sigset_t ksigmask, sigsaved;
9f72949f 1808 struct compat_timespec ts;
8ff3e8e8 1809 struct timespec end_time, *to = NULL;
9f72949f
DW		 1810 int ret;
1811
1812 if (tsp) {
1813 if (copy_from_user(&ts, tsp, sizeof(ts)))
1814 return -EFAULT;
1815
8ff3e8e8
AV		 1816 to = &end_time;
1817 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1818 return -EINVAL;
1819 }
1820
1821 if (sigmask) {
1822 if (sigsetsize != sizeof(compat_sigset_t))
1823 return -EINVAL;
1824 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1825 return -EFAULT;
1826 sigset_from_compat(&ksigmask, &ss32);
1827
1828 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1829 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1830 }
1831
8ff3e8e8
AV		 1832 ret = compat_core_sys_select(n, inp, outp, exp, to);
1833 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1834
1835 if (ret == -ERESTARTNOHAND) {
1836 /*
1837 * Don't restore the signal mask yet. Let do_signal() deliver
1838 * the signal on the way back to userspace, before the signal
1839 * mask is restored.
1840 */
1841 if (sigmask) {
1842 memcpy(&current->saved_sigmask, &sigsaved,
1843 sizeof(sigsaved));
4e4c22c7 1844 set_restore_sigmask();
9f72949f
DW		 1845 }
1846 } else if (sigmask)
1847 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1848
1849 return ret;
1850}
1851
1852asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1853 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1854 struct compat_timespec __user *tsp, void __user *sig)
1855{
1856 compat_size_t sigsetsize = 0;
1857 compat_uptr_t up = 0;
1858
1859 if (sig) {
1860 if (!access_ok(VERIFY_READ, sig,
1861 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1862 __get_user(up, (compat_uptr_t __user *)sig) ||
1863 __get_user(sigsetsize,
1864 (compat_size_t __user *)(sig+sizeof(up))))
1865 return -EFAULT;
1866 }
c9da9f21
HC		 1867 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1868 sigsetsize);
9f72949f
DW		 1869}
1870
1871asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1872 unsigned int nfds, struct compat_timespec __user *tsp,
1873 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1874{
1875 compat_sigset_t ss32;
1876 sigset_t ksigmask, sigsaved;
1877 struct compat_timespec ts;
8ff3e8e8 1878 struct timespec end_time, *to = NULL;
9f72949f
DW		 1879 int ret;
1880
1881 if (tsp) {
1882 if (copy_from_user(&ts, tsp, sizeof(ts)))
1883 return -EFAULT;
1884
8ff3e8e8
AV		 1885 to = &end_time;
1886 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1887 return -EINVAL;
9f72949f
DW		 1888 }
1889
1890 if (sigmask) {
3835a9bd 1891 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1892 return -EINVAL;
1893 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1894 return -EFAULT;
1895 sigset_from_compat(&ksigmask, &ss32);
1896
1897 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1898 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1899 }
1900
8ff3e8e8 1901 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1902
1903 /* We can restart this syscall, usually */
1904 if (ret == -EINTR) {
1905 /*
1906 * Don't restore the signal mask yet. Let do_signal() deliver
1907 * the signal on the way back to userspace, before the signal
1908 * mask is restored.
1909 */
1910 if (sigmask) {
1911 memcpy(&current->saved_sigmask, &sigsaved,
1912 sizeof(sigsaved));
4e4c22c7 1913 set_restore_sigmask();
9f72949f
DW		 1914 }
1915 ret = -ERESTARTNOHAND;
1916 } else if (sigmask)
1917 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1918
8ff3e8e8 1919 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1920
1921 return ret;
1922}
f3de272b 1923#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1924
1da177e4
LT		 1925#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1926/* Stuff for NFS server syscalls... */
1927struct compat_nfsctl_svc {
1928 u16 svc32_port;
1929 s32 svc32_nthreads;
1930};
1931
1932struct compat_nfsctl_client {
1933 s8 cl32_ident[NFSCLNT_IDMAX+1];
1934 s32 cl32_naddr;
1935 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1936 s32 cl32_fhkeytype;
1937 s32 cl32_fhkeylen;
1938 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1939};
1940
1941struct compat_nfsctl_export {
1942 char ex32_client[NFSCLNT_IDMAX+1];
1943 char ex32_path[NFS_MAXPATHLEN+1];
1944 compat_dev_t ex32_dev;
1945 compat_ino_t ex32_ino;
1946 compat_int_t ex32_flags;
202e5979
SR		 1947 __compat_uid_t ex32_anon_uid;
1948 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1949};
1950
1951struct compat_nfsctl_fdparm {
1952 struct sockaddr gd32_addr;
1953 s8 gd32_path[NFS_MAXPATHLEN+1];
1954 compat_int_t gd32_version;
1955};
1956
1957struct compat_nfsctl_fsparm {
1958 struct sockaddr gd32_addr;
1959 s8 gd32_path[NFS_MAXPATHLEN+1];
1960 compat_int_t gd32_maxlen;
1961};
1962
1963struct compat_nfsctl_arg {
1964 compat_int_t ca32_version; /* safeguard */
1965 union {
1966 struct compat_nfsctl_svc u32_svc;
1967 struct compat_nfsctl_client u32_client;
1968 struct compat_nfsctl_export u32_export;
1969 struct compat_nfsctl_fdparm u32_getfd;
1970 struct compat_nfsctl_fsparm u32_getfs;
1971 } u;
1972#define ca32_svc u.u32_svc
1973#define ca32_client u.u32_client
1974#define ca32_export u.u32_export
1975#define ca32_getfd u.u32_getfd
1976#define ca32_getfs u.u32_getfs
1977};
1978
1979union compat_nfsctl_res {
1980 __u8 cr32_getfh[NFS_FHSIZE];
1981 struct knfsd_fh cr32_getfs;
1982};
1983
d64b1c87
LFS		 1984static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1985 struct compat_nfsctl_arg __user *arg)
1da177e4 1986{
d64b1c87
LFS		 1987 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1988 get_user(karg->ca_version, &arg->ca32_version) ||
1989 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1990 __get_user(karg->ca_svc.svc_nthreads,
1991 &arg->ca32_svc.svc32_nthreads))
1992 return -EFAULT;
1993 return 0;
1da177e4
LT		 1994}
1995
d64b1c87
LFS		 1996static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1997 struct compat_nfsctl_arg __user *arg)
1da177e4 1998{
d64b1c87
LFS		 1999 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2000 sizeof(arg->ca32_client)) ||
2001 get_user(karg->ca_version, &arg->ca32_version) ||
2002 __copy_from_user(&karg->ca_client.cl_ident[0],
2003 &arg->ca32_client.cl32_ident[0],
2004 NFSCLNT_IDMAX) ||
2005 __get_user(karg->ca_client.cl_naddr,
2006 &arg->ca32_client.cl32_naddr) ||
2007 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2008 &arg->ca32_client.cl32_addrlist[0],
2009 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2010 __get_user(karg->ca_client.cl_fhkeytype,
2011 &arg->ca32_client.cl32_fhkeytype) ||
2012 __get_user(karg->ca_client.cl_fhkeylen,
2013 &arg->ca32_client.cl32_fhkeylen) ||
2014 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2015 &arg->ca32_client.cl32_fhkey[0],
2016 NFSCLNT_KEYMAX))
2017 return -EFAULT;
1da177e4 2018
d64b1c87 2019 return 0;
1da177e4
LT		 2020}
2021
d64b1c87
LFS		 2022static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2023 struct compat_nfsctl_arg __user *arg)
1da177e4 2024{
d64b1c87
LFS		 2025 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2026 sizeof(arg->ca32_export)) ||
2027 get_user(karg->ca_version, &arg->ca32_version) ||
2028 __copy_from_user(&karg->ca_export.ex_client[0],
2029 &arg->ca32_export.ex32_client[0],
2030 NFSCLNT_IDMAX) ||
2031 __copy_from_user(&karg->ca_export.ex_path[0],
2032 &arg->ca32_export.ex32_path[0],
2033 NFS_MAXPATHLEN) ||
2034 __get_user(karg->ca_export.ex_dev,
2035 &arg->ca32_export.ex32_dev) ||
2036 __get_user(karg->ca_export.ex_ino,
2037 &arg->ca32_export.ex32_ino) ||
2038 __get_user(karg->ca_export.ex_flags,
2039 &arg->ca32_export.ex32_flags) ||
2040 __get_user(karg->ca_export.ex_anon_uid,
2041 &arg->ca32_export.ex32_anon_uid) ||
2042 __get_user(karg->ca_export.ex_anon_gid,
2043 &arg->ca32_export.ex32_anon_gid))
2044 return -EFAULT;
1da177e4
LT		 2045 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2046 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2047
d64b1c87 2048 return 0;
1da177e4
LT		 2049}
2050
d64b1c87
LFS		 2051static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2052 struct compat_nfsctl_arg __user *arg)
1da177e4 2053{
d64b1c87
LFS		 2054 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2055 sizeof(arg->ca32_getfd)) ||
2056 get_user(karg->ca_version, &arg->ca32_version) ||
2057 __copy_from_user(&karg->ca_getfd.gd_addr,
2058 &arg->ca32_getfd.gd32_addr,
2059 (sizeof(struct sockaddr))) ||
2060 __copy_from_user(&karg->ca_getfd.gd_path,
2061 &arg->ca32_getfd.gd32_path,
2062 (NFS_MAXPATHLEN+1)) ||
2063 __get_user(karg->ca_getfd.gd_version,
2064 &arg->ca32_getfd.gd32_version))
2065 return -EFAULT;
1da177e4 2066
d64b1c87 2067 return 0;
1da177e4
LT		 2068}
2069
d64b1c87
LFS		 2070static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2071 struct compat_nfsctl_arg __user *arg)
1da177e4 2072{
d64b1c87
LFS		 2073 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2074 get_user(karg->ca_version, &arg->ca32_version) ||
2075 __copy_from_user(&karg->ca_getfs.gd_addr,
2076 &arg->ca32_getfs.gd32_addr,
2077 (sizeof(struct sockaddr))) ||
2078 __copy_from_user(&karg->ca_getfs.gd_path,
2079 &arg->ca32_getfs.gd32_path,
2080 (NFS_MAXPATHLEN+1)) ||
2081 __get_user(karg->ca_getfs.gd_maxlen,
2082 &arg->ca32_getfs.gd32_maxlen))
2083 return -EFAULT;
1da177e4 2084
d64b1c87 2085 return 0;
1da177e4
LT		 2086}
2087
2088/* This really doesn't need translations, we are only passing
2089 * back a union which contains opaque nfs file handle data.
2090 */
d64b1c87
LFS		 2091static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2092 union compat_nfsctl_res __user *res)
1da177e4
LT		 2093{
2094 int err;
2095
2096 err = copy_to_user(res, kres, sizeof(*res));
2097
2098 return (err) ? -EFAULT : 0;
2099}
2100
d64b1c87
LFS		 2101asmlinkage long compat_sys_nfsservctl(int cmd,
2102 struct compat_nfsctl_arg __user *arg,
2103 union compat_nfsctl_res __user *res)
1da177e4
LT		 2104{
2105 struct nfsctl_arg *karg;
2106 union nfsctl_res *kres;
2107 mm_segment_t oldfs;
2108 int err;
2109
2110 karg = kmalloc(sizeof(*karg), GFP_USER);
2111 kres = kmalloc(sizeof(*kres), GFP_USER);
2112 if(!karg || !kres) {
2113 err = -ENOMEM;
2114 goto done;
2115 }
2116
2117 switch(cmd) {
2118 case NFSCTL_SVC:
2119 err = compat_nfs_svc_trans(karg, arg);
2120 break;
2121
2122 case NFSCTL_ADDCLIENT:
2123 err = compat_nfs_clnt_trans(karg, arg);
2124 break;
2125
2126 case NFSCTL_DELCLIENT:
2127 err = compat_nfs_clnt_trans(karg, arg);
2128 break;
2129
2130 case NFSCTL_EXPORT:
2131 case NFSCTL_UNEXPORT:
2132 err = compat_nfs_exp_trans(karg, arg);
2133 break;
2134
2135 case NFSCTL_GETFD:
2136 err = compat_nfs_getfd_trans(karg, arg);
2137 break;
2138
2139 case NFSCTL_GETFS:
2140 err = compat_nfs_getfs_trans(karg, arg);
2141 break;
2142
2143 default:
2144 err = -EINVAL;
57070d01 2145 break;
1da177e4
LT		 2146 }
2147
57070d01
PS		 2148 if (err)
2149 goto done;
2150
1da177e4
LT		 2151 oldfs = get_fs();
2152 set_fs(KERNEL_DS);
2153 /* The __user pointer casts are valid because of the set_fs() */
2154 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2155 set_fs(oldfs);
2156
2157 if (err)
2158 goto done;
2159
2160 if((cmd == NFSCTL_GETFD) ||
2161 (cmd == NFSCTL_GETFS))
2162 err = compat_nfs_getfh_res_trans(kres, res);
2163
2164done:
2165 kfree(karg);
2166 kfree(kres);
2167 return err;
2168}
2169#else /* !NFSD */
2170long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2171{
2172 return sys_ni_syscall();
2173}
2174#endif
f6dfb4fd
DL		 2175
2176#ifdef CONFIG_EPOLL
2177
f3de272b 2178#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2179asmlinkage long compat_sys_epoll_pwait(int epfd,
2180 struct compat_epoll_event __user *events,
2181 int maxevents, int timeout,
2182 const compat_sigset_t __user *sigmask,
2183 compat_size_t sigsetsize)
2184{
2185 long err;
2186 compat_sigset_t csigmask;
2187 sigset_t ksigmask, sigsaved;
2188
2189 /*
2190 * If the caller wants a certain signal mask to be set during the wait,
2191 * we apply it here.
2192 */
2193 if (sigmask) {
2194 if (sigsetsize != sizeof(compat_sigset_t))
2195 return -EINVAL;
2196 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2197 return -EFAULT;
2198 sigset_from_compat(&ksigmask, &csigmask);
2199 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2200 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2201 }
2202
f6dfb4fd 2203 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2204
2205 /*
2206 * If we changed the signal mask, we need to restore the original one.
2207 * In case we've got a signal while waiting, we do not restore the
2208 * signal mask yet, and we allow do_signal() to deliver the signal on
2209 * the way back to userspace, before the signal mask is restored.
2210 */
2211 if (sigmask) {
2212 if (err == -EINTR) {
2213 memcpy(&current->saved_sigmask, &sigsaved,
2214 sizeof(sigsaved));
4e4c22c7 2215 set_restore_sigmask();
f6dfb4fd
DL		 2216 } else
2217 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2218 }
2219
2220 return err;
2221}
f3de272b 2222#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2223
2224#endif /* CONFIG_EPOLL */
6d18c922
DL		 2225
2226#ifdef CONFIG_SIGNALFD
2227
9deb27ba
UD		 2228asmlinkage long compat_sys_signalfd4(int ufd,
2229 const compat_sigset_t __user *sigmask,
2230 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2231{
2232 compat_sigset_t ss32;
2233 sigset_t tmp;
2234 sigset_t __user *ksigmask;
2235
2236 if (sigsetsize != sizeof(compat_sigset_t))
2237 return -EINVAL;
2238 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2239 return -EFAULT;
2240 sigset_from_compat(&tmp, &ss32);
2241 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2242 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2243 return -EFAULT;
2244
9deb27ba 2245 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2246}
2247
9deb27ba
UD		 2248asmlinkage long compat_sys_signalfd(int ufd,
2249 const compat_sigset_t __user *sigmask,
2250 compat_size_t sigsetsize)
2251{
2252 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2253}
6d18c922
DL		 2254#endif /* CONFIG_SIGNALFD */
2255
83f5d126
DL		 2256#ifdef CONFIG_TIMERFD
2257
4d672e7a
DL		 2258asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2259 const struct compat_itimerspec __user *utmr,
2260 struct compat_itimerspec __user *otmr)
83f5d126 2261{
4d672e7a 2262 int error;
83f5d126
DL		 2263 struct itimerspec t;
2264 struct itimerspec __user *ut;
2265
83f5d126 2266 if (get_compat_itimerspec(&t, utmr))
8317f14b 2267 return -EFAULT;
4d672e7a
DL		 2268 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2269 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2270 return -EFAULT;
4d672e7a
DL		 2271 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2272 if (!error && otmr)
2273 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2274 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2275
2276 return error;
2277}
2278
2279asmlinkage long compat_sys_timerfd_gettime(int ufd,
2280 struct compat_itimerspec __user *otmr)
2281{
2282 int error;
2283 struct itimerspec t;
2284 struct itimerspec __user *ut;
83f5d126 2285
4d672e7a
DL		 2286 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2287 error = sys_timerfd_gettime(ufd, ut);
2288 if (!error)
2289 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2290 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2291
2292 return error;
83f5d126
DL		 2293}
2294
2295#endif /* CONFIG_TIMERFD */
Linux 6.x block layer and io_uring tree(s)