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preadv/pwritev: create compat_writev()
[linux-2.6-block.git] / fs / compat.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
022a1692 18#include <linux/kernel.h>
1da177e4
LT		 19#include <linux/linkage.h>
20#include <linux/compat.h>
21#include <linux/errno.h>
22#include <linux/time.h>
23#include <linux/fs.h>
24#include <linux/fcntl.h>
25#include <linux/namei.h>
26#include <linux/file.h>
9f3acc31 27#include <linux/fdtable.h>
1da177e4 28#include <linux/vfs.h>
1da177e4
LT		 29#include <linux/ioctl.h>
30#include <linux/init.h>
1da177e4
LT		 31#include <linux/smb.h>
32#include <linux/smb_mount.h>
33#include <linux/ncp_mount.h>
9a9947bf 34#include <linux/nfs4_mount.h>
1da177e4
LT		 35#include <linux/smp_lock.h>
36#include <linux/syscalls.h>
37#include <linux/ctype.h>
38#include <linux/module.h>
39#include <linux/dirent.h>
0eeca283 40#include <linux/fsnotify.h>
1da177e4
LT		 41#include <linux/highuid.h>
42#include <linux/sunrpc/svc.h>
43#include <linux/nfsd/nfsd.h>
44#include <linux/nfsd/syscall.h>
45#include <linux/personality.h>
46#include <linux/rwsem.h>
8f0ab514 47#include <linux/tsacct_kern.h>
6272e266 48#include <linux/security.h>
a1f8e7f7 49#include <linux/highmem.h>
6d18c922 50#include <linux/signal.h>
bd01f843 51#include <linux/poll.h>
4a805e86 52#include <linux/mm.h>
f6dfb4fd 53#include <linux/eventpoll.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
103 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
104 && tv[0].tv_sec != 0)
105 return -EINVAL;
106 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107 && tv[1].tv_sec != 0)
108 return -EINVAL;
109
110 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111 return 0;
112 }
113 return do_utimes(dfd, filename, t ? tv : NULL, flags);
1da177e4
LT		 114}
115
9ad11ab4 116asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
1da177e4 117{
1c710c89 118 struct timespec tv[2];
1da177e4 119
9ad11ab4 120 if (t) {
1da177e4 121 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
1c710c89 122 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
1da177e4 123 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
1c710c89 124 get_user(tv[1].tv_nsec, &t[1].tv_usec))
9ad11ab4 125 return -EFAULT;
1c710c89
UD		 126 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128 return -EINVAL;
129 tv[0].tv_nsec *= 1000;
130 tv[1].tv_nsec *= 1000;
9ad11ab4 131 }
1c710c89 132 return do_utimes(dfd, filename, t ? tv : NULL, 0);
5590ff0d
UD		 133}
134
135asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136{
137 return compat_sys_futimesat(AT_FDCWD, filename, t);
1da177e4
LT		 138}
139
f7a5000f
CH		 140static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
141{
142 compat_ino_t ino = stat->ino;
143 typeof(ubuf->st_uid) uid = 0;
144 typeof(ubuf->st_gid) gid = 0;
145 int err;
146
147 SET_UID(uid, stat->uid);
148 SET_GID(gid, stat->gid);
149
150 if ((u64) stat->size > MAX_NON_LFS ||
151 !old_valid_dev(stat->dev) ||
152 !old_valid_dev(stat->rdev))
153 return -EOVERFLOW;
154 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
155 return -EOVERFLOW;
156
157 if (clear_user(ubuf, sizeof(*ubuf)))
158 return -EFAULT;
159
160 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
161 err |= __put_user(ino, &ubuf->st_ino);
162 err |= __put_user(stat->mode, &ubuf->st_mode);
163 err |= __put_user(stat->nlink, &ubuf->st_nlink);
164 err |= __put_user(uid, &ubuf->st_uid);
165 err |= __put_user(gid, &ubuf->st_gid);
166 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
167 err |= __put_user(stat->size, &ubuf->st_size);
168 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
169 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
170 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
171 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
172 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
173 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
174 err |= __put_user(stat->blksize, &ubuf->st_blksize);
175 err |= __put_user(stat->blocks, &ubuf->st_blocks);
176 return err;
177}
178
1da177e4
LT		 179asmlinkage long compat_sys_newstat(char __user * filename,
180 struct compat_stat __user *statbuf)
181{
182 struct kstat stat;
5590ff0d 183 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 184
185 if (!error)
186 error = cp_compat_stat(&stat, statbuf);
187 return error;
188}
189
190asmlinkage long compat_sys_newlstat(char __user * filename,
191 struct compat_stat __user *statbuf)
192{
193 struct kstat stat;
5590ff0d 194 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4
LT		 195
196 if (!error)
197 error = cp_compat_stat(&stat, statbuf);
198 return error;
199}
200
82d821dd 201#ifndef __ARCH_WANT_STAT64
9ad11ab4 202asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
5590ff0d
UD		 203 struct compat_stat __user *statbuf, int flag)
204{
205 struct kstat stat;
206 int error = -EINVAL;
207
208 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
209 goto out;
210
211 if (flag & AT_SYMLINK_NOFOLLOW)
212 error = vfs_lstat_fd(dfd, filename, &stat);
213 else
214 error = vfs_stat_fd(dfd, filename, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218
219out:
220 return error;
221}
82d821dd 222#endif
5590ff0d 223
1da177e4
LT		 224asmlinkage long compat_sys_newfstat(unsigned int fd,
225 struct compat_stat __user * statbuf)
226{
227 struct kstat stat;
228 int error = vfs_fstat(fd, &stat);
229
230 if (!error)
231 error = cp_compat_stat(&stat, statbuf);
232 return error;
233}
234
235static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
236{
237
238 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 239 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
240 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 241 return -EOVERFLOW;
242 /* f_files and f_ffree may be -1; it's okay
243 * to stuff that into 32 bits */
244 if (kbuf->f_files != 0xffffffffffffffffULL
245 && (kbuf->f_files & 0xffffffff00000000ULL))
246 return -EOVERFLOW;
247 if (kbuf->f_ffree != 0xffffffffffffffffULL
248 && (kbuf->f_ffree & 0xffffffff00000000ULL))
249 return -EOVERFLOW;
250 }
251 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
252 __put_user(kbuf->f_type, &ubuf->f_type) ||
253 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
254 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
255 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
256 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
257 __put_user(kbuf->f_files, &ubuf->f_files) ||
258 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
259 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
260 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
261 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
262 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
263 __put_user(0, &ubuf->f_spare[0]) ||
264 __put_user(0, &ubuf->f_spare[1]) ||
265 __put_user(0, &ubuf->f_spare[2]) ||
266 __put_user(0, &ubuf->f_spare[3]) ||
267 __put_user(0, &ubuf->f_spare[4]))
268 return -EFAULT;
269 return 0;
270}
271
272/*
273 * The following statfs calls are copies of code from fs/open.c and
274 * should be checked against those from time to time
275 */
2d8f3038 276asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 277{
2d8f3038 278 struct path path;
1da177e4
LT		 279 int error;
280
2d8f3038 281 error = user_path(pathname, &path);
1da177e4
LT		 282 if (!error) {
283 struct kstatfs tmp;
2d8f3038 284 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 285 if (!error)
286 error = put_compat_statfs(buf, &tmp);
2d8f3038 287 path_put(&path);
1da177e4
LT		 288 }
289 return error;
290}
291
292asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
293{
294 struct file * file;
295 struct kstatfs tmp;
296 int error;
297
298 error = -EBADF;
299 file = fget(fd);
300 if (!file)
301 goto out;
0f7fc9e4 302 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 303 if (!error)
304 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 305 fput(file);
306out:
307 return error;
308}
309
310static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
311{
312 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 313 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
314 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 315 return -EOVERFLOW;
316 /* f_files and f_ffree may be -1; it's okay
317 * to stuff that into 32 bits */
318 if (kbuf->f_files != 0xffffffffffffffffULL
319 && (kbuf->f_files & 0xffffffff00000000ULL))
320 return -EOVERFLOW;
321 if (kbuf->f_ffree != 0xffffffffffffffffULL
322 && (kbuf->f_ffree & 0xffffffff00000000ULL))
323 return -EOVERFLOW;
324 }
325 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
326 __put_user(kbuf->f_type, &ubuf->f_type) ||
327 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
328 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
329 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
330 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
331 __put_user(kbuf->f_files, &ubuf->f_files) ||
332 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
333 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
334 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
335 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
336 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
337 return -EFAULT;
338 return 0;
339}
340
2d8f3038 341asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 342{
2d8f3038 343 struct path path;
1da177e4
LT		 344 int error;
345
346 if (sz != sizeof(*buf))
347 return -EINVAL;
348
2d8f3038 349 error = user_path(pathname, &path);
1da177e4
LT		 350 if (!error) {
351 struct kstatfs tmp;
2d8f3038 352 error = vfs_statfs(path.dentry, &tmp);
86e07ce7
DG		 353 if (!error)
354 error = put_compat_statfs64(buf, &tmp);
2d8f3038 355 path_put(&path);
1da177e4
LT		 356 }
357 return error;
358}
359
360asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
361{
362 struct file * file;
363 struct kstatfs tmp;
364 int error;
365
366 if (sz != sizeof(*buf))
367 return -EINVAL;
368
369 error = -EBADF;
370 file = fget(fd);
371 if (!file)
372 goto out;
0f7fc9e4 373 error = vfs_statfs(file->f_path.dentry, &tmp);
86e07ce7
DG		 374 if (!error)
375 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 376 fput(file);
377out:
378 return error;
379}
380
2b1c6bd7
CH		 381/*
382 * This is a copy of sys_ustat, just dealing with a structure layout.
383 * Given how simple this syscall is that apporach is more maintainable
384 * than the various conversion hacks.
385 */
386asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
387{
388 struct super_block *sb;
389 struct compat_ustat tmp;
390 struct kstatfs sbuf;
391 int err;
392
393 sb = user_get_super(new_decode_dev(dev));
394 if (!sb)
395 return -EINVAL;
396 err = vfs_statfs(sb->s_root, &sbuf);
397 drop_super(sb);
398 if (err)
399 return err;
400
401 memset(&tmp, 0, sizeof(struct compat_ustat));
402 tmp.f_tfree = sbuf.f_bfree;
403 tmp.f_tinode = sbuf.f_ffree;
404 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
405 return -EFAULT;
406 return 0;
407}
408
1da177e4
LT		 409static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
410{
411 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
412 __get_user(kfl->l_type, &ufl->l_type) ||
413 __get_user(kfl->l_whence, &ufl->l_whence) ||
414 __get_user(kfl->l_start, &ufl->l_start) ||
415 __get_user(kfl->l_len, &ufl->l_len) ||
416 __get_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419}
420
421static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
422{
423 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
424 __put_user(kfl->l_type, &ufl->l_type) ||
425 __put_user(kfl->l_whence, &ufl->l_whence) ||
426 __put_user(kfl->l_start, &ufl->l_start) ||
427 __put_user(kfl->l_len, &ufl->l_len) ||
428 __put_user(kfl->l_pid, &ufl->l_pid))
429 return -EFAULT;
430 return 0;
431}
432
433#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
434static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
435{
436 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
437 __get_user(kfl->l_type, &ufl->l_type) ||
438 __get_user(kfl->l_whence, &ufl->l_whence) ||
439 __get_user(kfl->l_start, &ufl->l_start) ||
440 __get_user(kfl->l_len, &ufl->l_len) ||
441 __get_user(kfl->l_pid, &ufl->l_pid))
442 return -EFAULT;
443 return 0;
444}
445#endif
446
447#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
448static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
449{
450 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
451 __put_user(kfl->l_type, &ufl->l_type) ||
452 __put_user(kfl->l_whence, &ufl->l_whence) ||
453 __put_user(kfl->l_start, &ufl->l_start) ||
454 __put_user(kfl->l_len, &ufl->l_len) ||
455 __put_user(kfl->l_pid, &ufl->l_pid))
456 return -EFAULT;
457 return 0;
458}
459#endif
460
461asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
462 unsigned long arg)
463{
464 mm_segment_t old_fs;
465 struct flock f;
466 long ret;
467
468 switch (cmd) {
469 case F_GETLK:
470 case F_SETLK:
471 case F_SETLKW:
472 ret = get_compat_flock(&f, compat_ptr(arg));
473 if (ret != 0)
474 break;
475 old_fs = get_fs();
476 set_fs(KERNEL_DS);
477 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
478 set_fs(old_fs);
479 if (cmd == F_GETLK && ret == 0) {
2520f14c
N		 480 /* GETLK was successfule and we need to return the data...
481 * but it needs to fit in the compat structure.
482 * l_start shouldn't be too big, unless the original
483 * start + end is greater than COMPAT_OFF_T_MAX, in which
484 * case the app was asking for trouble, so we return
485 * -EOVERFLOW in that case.
486 * l_len could be too big, in which case we just truncate it,
487 * and only allow the app to see that part of the conflicting
488 * lock that might make sense to it anyway
489 */
490
491 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 492 ret = -EOVERFLOW;
2520f14c
N		 493 if (f.l_len > COMPAT_OFF_T_MAX)
494 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 495 if (ret == 0)
496 ret = put_compat_flock(&f, compat_ptr(arg));
497 }
498 break;
499
500 case F_GETLK64:
501 case F_SETLK64:
502 case F_SETLKW64:
503 ret = get_compat_flock64(&f, compat_ptr(arg));
504 if (ret != 0)
505 break;
506 old_fs = get_fs();
507 set_fs(KERNEL_DS);
508 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
509 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
510 (unsigned long)&f);
511 set_fs(old_fs);
512 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 513 /* need to return lock information - see above for commentary */
514 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 515 ret = -EOVERFLOW;
2520f14c
N		 516 if (f.l_len > COMPAT_LOFF_T_MAX)
517 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 518 if (ret == 0)
519 ret = put_compat_flock64(&f, compat_ptr(arg));
520 }
521 break;
522
523 default:
524 ret = sys_fcntl(fd, cmd, arg);
525 break;
526 }
527 return ret;
528}
529
530asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
531 unsigned long arg)
532{
533 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
534 return -EINVAL;
535 return compat_sys_fcntl64(fd, cmd, arg);
536}
537
538asmlinkage long
539compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
540{
541 long ret;
542 aio_context_t ctx64;
543
544 mm_segment_t oldfs = get_fs();
545 if (unlikely(get_user(ctx64, ctx32p)))
546 return -EFAULT;
547
548 set_fs(KERNEL_DS);
549 /* The __user pointer cast is valid because of the set_fs() */
550 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
551 set_fs(oldfs);
552 /* truncating is ok because it's a user address */
553 if (!ret)
554 ret = put_user((u32) ctx64, ctx32p);
555 return ret;
556}
557
558asmlinkage long
559compat_sys_io_getevents(aio_context_t ctx_id,
560 unsigned long min_nr,
561 unsigned long nr,
562 struct io_event __user *events,
563 struct compat_timespec __user *timeout)
564{
565 long ret;
566 struct timespec t;
567 struct timespec __user *ut = NULL;
568
569 ret = -EFAULT;
570 if (unlikely(!access_ok(VERIFY_WRITE, events,
571 nr * sizeof(struct io_event))))
572 goto out;
573 if (timeout) {
574 if (get_compat_timespec(&t, timeout))
575 goto out;
576
577 ut = compat_alloc_user_space(sizeof(*ut));
578 if (copy_to_user(ut, &t, sizeof(t)) )
579 goto out;
580 }
581 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
582out:
583 return ret;
584}
585
586static inline long
587copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
588{
589 compat_uptr_t uptr;
590 int i;
591
592 for (i = 0; i < nr; ++i) {
593 if (get_user(uptr, ptr32 + i))
594 return -EFAULT;
595 if (put_user(compat_ptr(uptr), ptr64 + i))
596 return -EFAULT;
597 }
598 return 0;
599}
600
601#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
602
603asmlinkage long
604compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
605{
606 struct iocb __user * __user *iocb64;
607 long ret;
608
609 if (unlikely(nr < 0))
610 return -EINVAL;
611
612 if (nr > MAX_AIO_SUBMITS)
613 nr = MAX_AIO_SUBMITS;
614
615 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
616 ret = copy_iocb(nr, iocb, iocb64);
617 if (!ret)
618 ret = sys_io_submit(ctx_id, nr, iocb64);
619 return ret;
620}
621
622struct compat_ncp_mount_data {
623 compat_int_t version;
624 compat_uint_t ncp_fd;
202e5979 625 __compat_uid_t mounted_uid;
1da177e4
LT		 626 compat_pid_t wdog_pid;
627 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
628 compat_uint_t time_out;
629 compat_uint_t retry_count;
630 compat_uint_t flags;
202e5979
SR		 631 __compat_uid_t uid;
632 __compat_gid_t gid;
1da177e4
LT		 633 compat_mode_t file_mode;
634 compat_mode_t dir_mode;
635};
636
637struct compat_ncp_mount_data_v4 {
638 compat_int_t version;
639 compat_ulong_t flags;
640 compat_ulong_t mounted_uid;
641 compat_long_t wdog_pid;
642 compat_uint_t ncp_fd;
643 compat_uint_t time_out;
644 compat_uint_t retry_count;
645 compat_ulong_t uid;
646 compat_ulong_t gid;
647 compat_ulong_t file_mode;
648 compat_ulong_t dir_mode;
649};
650
651static void *do_ncp_super_data_conv(void *raw_data)
652{
653 int version = *(unsigned int *)raw_data;
654
655 if (version == 3) {
656 struct compat_ncp_mount_data *c_n = raw_data;
657 struct ncp_mount_data *n = raw_data;
658
659 n->dir_mode = c_n->dir_mode;
660 n->file_mode = c_n->file_mode;
661 n->gid = c_n->gid;
662 n->uid = c_n->uid;
663 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
664 n->wdog_pid = c_n->wdog_pid;
665 n->mounted_uid = c_n->mounted_uid;
666 } else if (version == 4) {
667 struct compat_ncp_mount_data_v4 *c_n = raw_data;
668 struct ncp_mount_data_v4 *n = raw_data;
669
670 n->dir_mode = c_n->dir_mode;
671 n->file_mode = c_n->file_mode;
672 n->gid = c_n->gid;
673 n->uid = c_n->uid;
674 n->retry_count = c_n->retry_count;
675 n->time_out = c_n->time_out;
676 n->ncp_fd = c_n->ncp_fd;
677 n->wdog_pid = c_n->wdog_pid;
678 n->mounted_uid = c_n->mounted_uid;
679 n->flags = c_n->flags;
680 } else if (version != 5) {
681 return NULL;
682 }
683
684 return raw_data;
685}
686
687struct compat_smb_mount_data {
688 compat_int_t version;
202e5979
SR		 689 __compat_uid_t mounted_uid;
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
696static void *do_smb_super_data_conv(void *raw_data)
697{
698 struct smb_mount_data *s = raw_data;
699 struct compat_smb_mount_data *c_s = raw_data;
700
701 if (c_s->version != SMB_MOUNT_OLDVERSION)
702 goto out;
703 s->dir_mode = c_s->dir_mode;
704 s->file_mode = c_s->file_mode;
705 s->gid = c_s->gid;
706 s->uid = c_s->uid;
707 s->mounted_uid = c_s->mounted_uid;
708 out:
709 return raw_data;
710}
711
9a9947bf
DH		 712struct compat_nfs_string {
713 compat_uint_t len;
5fc3e624 714 compat_uptr_t data;
9a9947bf
DH		 715};
716
717static inline void compat_nfs_string(struct nfs_string *dst,
718 struct compat_nfs_string *src)
719{
720 dst->data = compat_ptr(src->data);
721 dst->len = src->len;
722}
723
724struct compat_nfs4_mount_data_v1 {
725 compat_int_t version;
726 compat_int_t flags;
727 compat_int_t rsize;
728 compat_int_t wsize;
729 compat_int_t timeo;
730 compat_int_t retrans;
731 compat_int_t acregmin;
732 compat_int_t acregmax;
733 compat_int_t acdirmin;
734 compat_int_t acdirmax;
735 struct compat_nfs_string client_addr;
736 struct compat_nfs_string mnt_path;
737 struct compat_nfs_string hostname;
738 compat_uint_t host_addrlen;
5fc3e624 739 compat_uptr_t host_addr;
9a9947bf
DH		 740 compat_int_t proto;
741 compat_int_t auth_flavourlen;
5fc3e624 742 compat_uptr_t auth_flavours;
9a9947bf
DH		 743};
744
745static int do_nfs4_super_data_conv(void *raw_data)
746{
747 int version = *(compat_uint_t *) raw_data;
748
749 if (version == 1) {
750 struct compat_nfs4_mount_data_v1 *raw = raw_data;
751 struct nfs4_mount_data *real = raw_data;
752
753 /* copy the fields backwards */
754 real->auth_flavours = compat_ptr(raw->auth_flavours);
755 real->auth_flavourlen = raw->auth_flavourlen;
756 real->proto = raw->proto;
757 real->host_addr = compat_ptr(raw->host_addr);
758 real->host_addrlen = raw->host_addrlen;
759 compat_nfs_string(&real->hostname, &raw->hostname);
760 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
761 compat_nfs_string(&real->client_addr, &raw->client_addr);
762 real->acdirmax = raw->acdirmax;
763 real->acdirmin = raw->acdirmin;
764 real->acregmax = raw->acregmax;
765 real->acregmin = raw->acregmin;
766 real->retrans = raw->retrans;
767 real->timeo = raw->timeo;
768 real->wsize = raw->wsize;
769 real->rsize = raw->rsize;
770 real->flags = raw->flags;
771 real->version = raw->version;
772 }
9a9947bf
DH		 773
774 return 0;
775}
776
1da177e4
LT		 777#define SMBFS_NAME "smbfs"
778#define NCPFS_NAME "ncpfs"
9a9947bf 779#define NFS4_NAME "nfs4"
1da177e4
LT		 780
781asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
782 char __user * type, unsigned long flags,
783 void __user * data)
784{
785 unsigned long type_page;
786 unsigned long data_page;
787 unsigned long dev_page;
788 char *dir_page;
789 int retval;
790
791 retval = copy_mount_options (type, &type_page);
792 if (retval < 0)
793 goto out;
794
795 dir_page = getname(dir_name);
796 retval = PTR_ERR(dir_page);
797 if (IS_ERR(dir_page))
798 goto out1;
799
800 retval = copy_mount_options (dev_name, &dev_page);
801 if (retval < 0)
802 goto out2;
803
804 retval = copy_mount_options (data, &data_page);
805 if (retval < 0)
806 goto out3;
807
808 retval = -EINVAL;
809
822191a2 810 if (type_page && data_page) {
1da177e4
LT		 811 if (!strcmp((char *)type_page, SMBFS_NAME)) {
812 do_smb_super_data_conv((void *)data_page);
813 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
814 do_ncp_super_data_conv((void *)data_page);
9a9947bf
DH		 815 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
816 if (do_nfs4_super_data_conv((void *) data_page))
817 goto out4;
1da177e4
LT		 818 }
819 }
820
821 lock_kernel();
822 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
823 flags, (void*)data_page);
824 unlock_kernel();
825
9a9947bf 826 out4:
1da177e4
LT		 827 free_page(data_page);
828 out3:
829 free_page(dev_page);
830 out2:
831 putname(dir_page);
832 out1:
833 free_page(type_page);
834 out:
835 return retval;
836}
837
838#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
1da177e4
LT		 839
840struct compat_old_linux_dirent {
841 compat_ulong_t d_ino;
842 compat_ulong_t d_offset;
843 unsigned short d_namlen;
844 char d_name[1];
845};
846
847struct compat_readdir_callback {
848 struct compat_old_linux_dirent __user *dirent;
849 int result;
850};
851
852static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 853 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 854{
855 struct compat_readdir_callback *buf = __buf;
856 struct compat_old_linux_dirent __user *dirent;
afefdbb2 857 compat_ulong_t d_ino;
1da177e4
LT		 858
859 if (buf->result)
860 return -EINVAL;
afefdbb2 861 d_ino = ino;
8f3f655d
AV		 862 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
863 buf->result = -EOVERFLOW;
afefdbb2 864 return -EOVERFLOW;
8f3f655d 865 }
1da177e4
LT		 866 buf->result++;
867 dirent = buf->dirent;
868 if (!access_ok(VERIFY_WRITE, dirent,
869 (unsigned long)(dirent->d_name + namlen + 1) -
870 (unsigned long)dirent))
871 goto efault;
afefdbb2 872 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 873 __put_user(offset, &dirent->d_offset) ||
874 __put_user(namlen, &dirent->d_namlen) ||
875 __copy_to_user(dirent->d_name, name, namlen) ||
876 __put_user(0, dirent->d_name + namlen))
877 goto efault;
878 return 0;
879efault:
880 buf->result = -EFAULT;
881 return -EFAULT;
882}
883
884asmlinkage long compat_sys_old_readdir(unsigned int fd,
885 struct compat_old_linux_dirent __user *dirent, unsigned int count)
886{
887 int error;
888 struct file *file;
889 struct compat_readdir_callback buf;
890
891 error = -EBADF;
892 file = fget(fd);
893 if (!file)
894 goto out;
895
896 buf.result = 0;
897 buf.dirent = dirent;
898
899 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 900 if (buf.result)
1da177e4
LT		 901 error = buf.result;
902
903 fput(file);
904out:
905 return error;
906}
907
908struct compat_linux_dirent {
909 compat_ulong_t d_ino;
910 compat_ulong_t d_off;
911 unsigned short d_reclen;
912 char d_name[1];
913};
914
915struct compat_getdents_callback {
916 struct compat_linux_dirent __user *current_dir;
917 struct compat_linux_dirent __user *previous;
918 int count;
919 int error;
920};
921
922static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 923 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 924{
925 struct compat_linux_dirent __user * dirent;
926 struct compat_getdents_callback *buf = __buf;
afefdbb2 927 compat_ulong_t d_ino;
022a1692 928 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 929
930 buf->error = -EINVAL; /* only used if we fail.. */
931 if (reclen > buf->count)
932 return -EINVAL;
afefdbb2 933 d_ino = ino;
8f3f655d
AV		 934 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
935 buf->error = -EOVERFLOW;
afefdbb2 936 return -EOVERFLOW;
8f3f655d 937 }
1da177e4
LT		 938 dirent = buf->previous;
939 if (dirent) {
940 if (__put_user(offset, &dirent->d_off))
941 goto efault;
942 }
943 dirent = buf->current_dir;
afefdbb2 944 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 945 goto efault;
946 if (__put_user(reclen, &dirent->d_reclen))
947 goto efault;
948 if (copy_to_user(dirent->d_name, name, namlen))
949 goto efault;
950 if (__put_user(0, dirent->d_name + namlen))
951 goto efault;
952 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
953 goto efault;
954 buf->previous = dirent;
955 dirent = (void __user *)dirent + reclen;
956 buf->current_dir = dirent;
957 buf->count -= reclen;
958 return 0;
959efault:
960 buf->error = -EFAULT;
961 return -EFAULT;
962}
963
964asmlinkage long compat_sys_getdents(unsigned int fd,
965 struct compat_linux_dirent __user *dirent, unsigned int count)
966{
967 struct file * file;
968 struct compat_linux_dirent __user * lastdirent;
969 struct compat_getdents_callback buf;
970 int error;
971
972 error = -EFAULT;
973 if (!access_ok(VERIFY_WRITE, dirent, count))
974 goto out;
975
976 error = -EBADF;
977 file = fget(fd);
978 if (!file)
979 goto out;
980
981 buf.current_dir = dirent;
982 buf.previous = NULL;
983 buf.count = count;
984 buf.error = 0;
985
986 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 987 if (error >= 0)
988 error = buf.error;
1da177e4
LT		 989 lastdirent = buf.previous;
990 if (lastdirent) {
991 if (put_user(file->f_pos, &lastdirent->d_off))
992 error = -EFAULT;
993 else
994 error = count - buf.count;
995 }
1da177e4
LT		 996 fput(file);
997out:
998 return error;
999}
1000
1001#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 1002
1003struct compat_getdents_callback64 {
1004 struct linux_dirent64 __user *current_dir;
1005 struct linux_dirent64 __user *previous;
1006 int count;
1007 int error;
1008};
1009
1010static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 1011 u64 ino, unsigned int d_type)
1da177e4
LT		 1012{
1013 struct linux_dirent64 __user *dirent;
1014 struct compat_getdents_callback64 *buf = __buf;
1015 int jj = NAME_OFFSET(dirent);
022a1692 1016 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
1da177e4
LT		 1017 u64 off;
1018
1019 buf->error = -EINVAL; /* only used if we fail.. */
1020 if (reclen > buf->count)
1021 return -EINVAL;
1022 dirent = buf->previous;
1023
1024 if (dirent) {
1025 if (__put_user_unaligned(offset, &dirent->d_off))
1026 goto efault;
1027 }
1028 dirent = buf->current_dir;
1029 if (__put_user_unaligned(ino, &dirent->d_ino))
1030 goto efault;
1031 off = 0;
1032 if (__put_user_unaligned(off, &dirent->d_off))
1033 goto efault;
1034 if (__put_user(reclen, &dirent->d_reclen))
1035 goto efault;
1036 if (__put_user(d_type, &dirent->d_type))
1037 goto efault;
1038 if (copy_to_user(dirent->d_name, name, namlen))
1039 goto efault;
1040 if (__put_user(0, dirent->d_name + namlen))
1041 goto efault;
1042 buf->previous = dirent;
1043 dirent = (void __user *)dirent + reclen;
1044 buf->current_dir = dirent;
1045 buf->count -= reclen;
1046 return 0;
1047efault:
1048 buf->error = -EFAULT;
1049 return -EFAULT;
1050}
1051
1052asmlinkage long compat_sys_getdents64(unsigned int fd,
1053 struct linux_dirent64 __user * dirent, unsigned int count)
1054{
1055 struct file * file;
1056 struct linux_dirent64 __user * lastdirent;
1057 struct compat_getdents_callback64 buf;
1058 int error;
1059
1060 error = -EFAULT;
1061 if (!access_ok(VERIFY_WRITE, dirent, count))
1062 goto out;
1063
1064 error = -EBADF;
1065 file = fget(fd);
1066 if (!file)
1067 goto out;
1068
1069 buf.current_dir = dirent;
1070 buf.previous = NULL;
1071 buf.count = count;
1072 buf.error = 0;
1073
1074 error = vfs_readdir(file, compat_filldir64, &buf);
53c9c5c0
AV		 1075 if (error >= 0)
1076 error = buf.error;
1da177e4
LT		 1077 lastdirent = buf.previous;
1078 if (lastdirent) {
1079 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1080 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1081 error = -EFAULT;
1082 else
1083 error = count - buf.count;
1da177e4 1084 }
1da177e4
LT		 1085 fput(file);
1086out:
1087 return error;
1088}
1089#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1090
1091static ssize_t compat_do_readv_writev(int type, struct file *file,
1092 const struct compat_iovec __user *uvector,
1093 unsigned long nr_segs, loff_t *pos)
1094{
1da177e4
LT		 1095 compat_ssize_t tot_len;
1096 struct iovec iovstack[UIO_FASTIOV];
1097 struct iovec *iov=iovstack, *vector;
1098 ssize_t ret;
1099 int seg;
1100 io_fn_t fn;
1101 iov_fn_t fnv;
1102
1103 /*
1104 * SuS says "The readv() function *may* fail if the iovcnt argument
1105 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1106 * traditionally returned zero for zero segments, so...
1107 */
1108 ret = 0;
1109 if (nr_segs == 0)
1110 goto out;
1111
1112 /*
1113 * First get the "struct iovec" from user memory and
1114 * verify all the pointers
1115 */
1116 ret = -EINVAL;
1117 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1118 goto out;
1119 if (!file->f_op)
1120 goto out;
1121 if (nr_segs > UIO_FASTIOV) {
1122 ret = -ENOMEM;
1123 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1124 if (!iov)
1125 goto out;
1126 }
1127 ret = -EFAULT;
1128 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1129 goto out;
1130
1131 /*
1132 * Single unix specification:
1133 * We should -EINVAL if an element length is not >= 0 and fitting an
1134 * ssize_t. The total length is fitting an ssize_t
1135 *
1136 * Be careful here because iov_len is a size_t not an ssize_t
1137 */
1138 tot_len = 0;
1139 vector = iov;
1140 ret = -EINVAL;
1141 for (seg = 0 ; seg < nr_segs; seg++) {
1142 compat_ssize_t tmp = tot_len;
1143 compat_ssize_t len;
1144 compat_uptr_t buf;
1145
1146 if (__get_user(len, &uvector->iov_len) ||
1147 __get_user(buf, &uvector->iov_base)) {
1148 ret = -EFAULT;
1149 goto out;
1150 }
1151 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1152 goto out;
1153 tot_len += len;
1154 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1155 goto out;
1156 vector->iov_base = compat_ptr(buf);
1157 vector->iov_len = (compat_size_t) len;
1158 uvector++;
1159 vector++;
1160 }
1161 if (tot_len == 0) {
1162 ret = 0;
1163 goto out;
1164 }
1165
1166 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1167 if (ret < 0)
1da177e4
LT		 1168 goto out;
1169
1170 fnv = NULL;
1171 if (type == READ) {
1172 fn = file->f_op->read;
ee0b3e67 1173 fnv = file->f_op->aio_read;
1da177e4
LT		 1174 } else {
1175 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1176 fnv = file->f_op->aio_write;
1da177e4
LT		 1177 }
1178
ee0b3e67
BP		 1179 if (fnv)
1180 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1181 pos, fnv);
1182 else
1183 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1184
1da177e4
LT		 1185out:
1186 if (iov != iovstack)
1187 kfree(iov);
0eeca283 1188 if ((ret + (type == READ)) > 0) {
0f7fc9e4 1189 struct dentry *dentry = file->f_path.dentry;
0eeca283
RL		 1190 if (type == READ)
1191 fsnotify_access(dentry);
1192 else
1193 fsnotify_modify(dentry);
1194 }
1da177e4
LT		 1195 return ret;
1196}
1197
dac12138
GH		 1198static size_t compat_readv(struct file *file,
1199 const struct compat_iovec __user *vec,
1200 unsigned long vlen, loff_t *pos)
1da177e4 1201{
1da177e4
LT		 1202 ssize_t ret = -EBADF;
1203
1da177e4
LT		 1204 if (!(file->f_mode & FMODE_READ))
1205 goto out;
1206
1207 ret = -EINVAL;
ee0b3e67 1208 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1209 goto out;
1210
dac12138 1211 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1212
1213out:
ca8a5bd2
GH		 1214 if (ret > 0)
1215 add_rchar(current, ret);
1216 inc_syscr(current);
dac12138
GH		 1217 return ret;
1218}
1219
1220asmlinkage ssize_t
1221compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1222 unsigned long vlen)
1223{
1224 struct file *file;
1225 ssize_t ret;
1226
1227 file = fget(fd);
1228 if (!file)
1229 return -EBADF;
1230 ret = compat_readv(file, vec, vlen, &file->f_pos);
1da177e4
LT		 1231 fput(file);
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;
1262 ssize_t ret;
1263
1264 file = fget(fd);
1265 if (!file)
1266 return -EBADF;
1267 ret = compat_writev(file, vec, vlen, &file->f_pos);
1da177e4
LT		 1268 fput(file);
1269 return ret;
1270}
1271
d2610202
AK		 1272asmlinkage long
1273compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1274 unsigned int nr_segs, unsigned int flags)
1275{
1276 unsigned i;
90cbad65 1277 struct iovec __user *iov;
98232d50 1278 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1279 return -EINVAL;
1280 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1281 for (i = 0; i < nr_segs; i++) {
1282 struct compat_iovec v;
1283 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1284 get_user(v.iov_len, &iov32[i].iov_len) ||
1285 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1286 put_user(v.iov_len, &iov[i].iov_len))
1287 return -EFAULT;
1288 }
1289 return sys_vmsplice(fd, iov, nr_segs, flags);
1290}
1291
e922efc3
MS		 1292/*
1293 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1294 * O_LARGEFILE flag.
1295 */
1296asmlinkage long
1297compat_sys_open(const char __user *filename, int flags, int mode)
1298{
5590ff0d
UD		 1299 return do_sys_open(AT_FDCWD, filename, flags, mode);
1300}
1301
1302/*
1303 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1304 * O_LARGEFILE flag.
1305 */
1306asmlinkage long
9ad11ab4 1307compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1308{
1309 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1310}
1311
1da177e4
LT		 1312/*
1313 * compat_count() counts the number of arguments/envelopes. It is basically
1314 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1315 * and envp pointers.
1316 */
1317static int compat_count(compat_uptr_t __user *argv, int max)
1318{
1319 int i = 0;
1320
1321 if (argv != NULL) {
1322 for (;;) {
1323 compat_uptr_t p;
1324
1325 if (get_user(p, argv))
1326 return -EFAULT;
1327 if (!p)
1328 break;
1329 argv++;
362e6663 1330 if (i++ >= max)
1da177e4
LT		 1331 return -E2BIG;
1332 }
1333 }
1334 return i;
1335}
1336
1337/*
1338 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1339 * except that it works with 32 bit argv and envp pointers.
1340 */
1341static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1342 struct linux_binprm *bprm)
1343{
1344 struct page *kmapped_page = NULL;
1345 char *kaddr = NULL;
b6a2fea3 1346 unsigned long kpos = 0;
1da177e4
LT		 1347 int ret;
1348
1349 while (argc-- > 0) {
1350 compat_uptr_t str;
1351 int len;
1352 unsigned long pos;
1353
1354 if (get_user(str, argv+argc) ||
b6a2fea3 1355 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1356 ret = -EFAULT;
1357 goto out;
1358 }
1359
b6a2fea3 1360 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1361 ret = -E2BIG;
1362 goto out;
1363 }
1364
b6a2fea3 1365 /* We're going to work our way backwords. */
1da177e4 1366 pos = bprm->p;
b6a2fea3
OW		 1367 str += len;
1368 bprm->p -= len;
1da177e4
LT		 1369
1370 while (len > 0) {
1da177e4 1371 int offset, bytes_to_copy;
1da177e4
LT		 1372
1373 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1374 if (offset == 0)
1375 offset = PAGE_SIZE;
1376
1377 bytes_to_copy = offset;
1378 if (bytes_to_copy > len)
1379 bytes_to_copy = len;
1380
1381 offset -= bytes_to_copy;
1382 pos -= bytes_to_copy;
1383 str -= bytes_to_copy;
1384 len -= bytes_to_copy;
1385
1386 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1387 struct page *page;
1388
1389#ifdef CONFIG_STACK_GROWSUP
1390 ret = expand_stack_downwards(bprm->vma, pos);
1391 if (ret < 0) {
1392 /* We've exceed the stack rlimit. */
1393 ret = -E2BIG;
1394 goto out;
1395 }
1396#endif
1397 ret = get_user_pages(current, bprm->mm, pos,
1398 1, 1, 1, &page, NULL);
1399 if (ret <= 0) {
1400 /* We've exceed the stack rlimit. */
1401 ret = -E2BIG;
1da177e4
LT		 1402 goto out;
1403 }
1da177e4 1404
b6a2fea3
OW		 1405 if (kmapped_page) {
1406 flush_kernel_dcache_page(kmapped_page);
1da177e4 1407 kunmap(kmapped_page);
b6a2fea3
OW		 1408 put_page(kmapped_page);
1409 }
1da177e4
LT		 1410 kmapped_page = page;
1411 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1412 kpos = pos & PAGE_MASK;
1413 flush_cache_page(bprm->vma, kpos,
1414 page_to_pfn(kmapped_page));
1da177e4 1415 }
b6a2fea3
OW		 1416 if (copy_from_user(kaddr+offset, compat_ptr(str),
1417 bytes_to_copy)) {
1da177e4
LT		 1418 ret = -EFAULT;
1419 goto out;
1420 }
1da177e4
LT		 1421 }
1422 }
1423 ret = 0;
1424out:
b6a2fea3
OW		 1425 if (kmapped_page) {
1426 flush_kernel_dcache_page(kmapped_page);
1da177e4 1427 kunmap(kmapped_page);
b6a2fea3 1428 put_page(kmapped_page);
1da177e4 1429 }
b6a2fea3 1430 return ret;
1da177e4
LT		 1431}
1432
1da177e4
LT		 1433/*
1434 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1435 * that it processes 32 bit argv and envp pointers.
1436 */
1437int compat_do_execve(char * filename,
1438 compat_uptr_t __user *argv,
1439 compat_uptr_t __user *envp,
1440 struct pt_regs * regs)
1441{
1442 struct linux_binprm *bprm;
1443 struct file *file;
53e9309e 1444 struct files_struct *displaced;
1da177e4 1445 int retval;
1da177e4 1446
53e9309e
HD		 1447 retval = unshare_files(&displaced);
1448 if (retval)
1449 goto out_ret;
1450
1da177e4 1451 retval = -ENOMEM;
11b0b5ab 1452 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1453 if (!bprm)
53e9309e 1454 goto out_files;
1da177e4 1455
a6f76f23
DH		 1456 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
1457 if (retval < 0)
1458 goto out_free;
f9ce1f1c 1459 current->in_execve = 1;
a6f76f23
DH		 1460
1461 retval = -ENOMEM;
1462 bprm->cred = prepare_exec_creds();
1463 if (!bprm->cred)
1464 goto out_unlock;
e426b64c 1465 check_unsafe_exec(bprm);
a6f76f23 1466
1da177e4
LT		 1467 file = open_exec(filename);
1468 retval = PTR_ERR(file);
1469 if (IS_ERR(file))
a6f76f23 1470 goto out_unlock;
1da177e4
LT		 1471
1472 sched_exec();
1473
1da177e4
LT		 1474 bprm->file = file;
1475 bprm->filename = filename;
1476 bprm->interp = filename;
1da177e4 1477
b6a2fea3
OW		 1478 retval = bprm_mm_init(bprm);
1479 if (retval)
1480 goto out_file;
1da177e4 1481
b6a2fea3 1482 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1483 if ((retval = bprm->argc) < 0)
a6f76f23 1484 goto out;
1da177e4 1485
b6a2fea3 1486 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1487 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1488 goto out;
1489
1490 retval = prepare_binprm(bprm);
1491 if (retval < 0)
1492 goto out;
1493
1494 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1495 if (retval < 0)
1496 goto out;
1497
1498 bprm->exec = bprm->p;
1499 retval = compat_copy_strings(bprm->envc, envp, bprm);
1500 if (retval < 0)
1501 goto out;
1502
1503 retval = compat_copy_strings(bprm->argc, argv, bprm);
1504 if (retval < 0)
1505 goto out;
1506
1507 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1508 if (retval < 0)
1509 goto out;
1da177e4 1510
a6f76f23 1511 /* execve succeeded */
f9ce1f1c 1512 current->in_execve = 0;
a6f76f23
DH		 1513 mutex_unlock(&current->cred_exec_mutex);
1514 acct_update_integrals(current);
1515 free_bprm(bprm);
53e9309e
HD		 1516 if (displaced)
1517 put_files_struct(displaced);
a6f76f23 1518 return retval;
1da177e4 1519
a6f76f23 1520out:
1da177e4 1521 if (bprm->mm)
b6a2fea3 1522 mmput(bprm->mm);
1da177e4
LT		 1523
1524out_file:
1525 if (bprm->file) {
1526 allow_write_access(bprm->file);
1527 fput(bprm->file);
1528 }
1529
a6f76f23 1530out_unlock:
f9ce1f1c 1531 current->in_execve = 0;
a6f76f23
DH		 1532 mutex_unlock(&current->cred_exec_mutex);
1533
1534out_free:
08a6fac1 1535 free_bprm(bprm);
1da177e4 1536
53e9309e
HD		 1537out_files:
1538 if (displaced)
1539 reset_files_struct(displaced);
1da177e4
LT		 1540out_ret:
1541 return retval;
1542}
1543
1544#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1545
b773ad40
TG		 1546static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1547 int timeval, int ret)
1548{
1549 struct timespec ts;
1550
1551 if (!p)
1552 return ret;
1553
1554 if (current->personality & STICKY_TIMEOUTS)
1555 goto sticky;
1556
1557 /* No update for zero timeout */
1558 if (!end_time->tv_sec && !end_time->tv_nsec)
1559 return ret;
1560
1561 ktime_get_ts(&ts);
1562 ts = timespec_sub(*end_time, ts);
1563 if (ts.tv_sec < 0)
1564 ts.tv_sec = ts.tv_nsec = 0;
1565
1566 if (timeval) {
1567 struct compat_timeval rtv;
1568
1569 rtv.tv_sec = ts.tv_sec;
1570 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1571
1572 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1573 return ret;
1574 } else {
1575 struct compat_timespec rts;
1576
1577 rts.tv_sec = ts.tv_sec;
1578 rts.tv_nsec = ts.tv_nsec;
1579
1580 if (!copy_to_user(p, &rts, sizeof(rts)))
1581 return ret;
1582 }
1583 /*
1584 * If an application puts its timeval in read-only memory, we
1585 * don't want the Linux-specific update to the timeval to
1586 * cause a fault after the select has completed
1587 * successfully. However, because we're not updating the
1588 * timeval, we can't restart the system call.
1589 */
1590
1591sticky:
1592 if (ret == -ERESTARTNOHAND)
1593 ret = -EINTR;
1594 return ret;
1595}
1596
1da177e4
LT		 1597/*
1598 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1599 * 64-bit unsigned longs.
1600 */
858119e1 1601static
1da177e4
LT		 1602int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1603 unsigned long *fdset)
1604{
022a1692 1605 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1606 if (ufdset) {
1607 unsigned long odd;
1608
1609 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1610 return -EFAULT;
1611
1612 odd = nr & 1UL;
1613 nr &= ~1UL;
1614 while (nr) {
1615 unsigned long h, l;
7116e994
HC		 1616 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1617 return -EFAULT;
1da177e4
LT		 1618 ufdset += 2;
1619 *fdset++ = h << 32 | l;
1620 nr -= 2;
1621 }
7116e994
HC		 1622 if (odd && __get_user(*fdset, ufdset))
1623 return -EFAULT;
1da177e4
LT		 1624 } else {
1625 /* Tricky, must clear full unsigned long in the
1626 * kernel fdset at the end, this makes sure that
1627 * actually happens.
1628 */
1629 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1630 }
1631 return 0;
1632}
1633
858119e1 1634static
7116e994
HC		 1635int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1636 unsigned long *fdset)
1da177e4
LT		 1637{
1638 unsigned long odd;
022a1692 1639 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1640
1641 if (!ufdset)
7116e994 1642 return 0;
1da177e4
LT		 1643
1644 odd = nr & 1UL;
1645 nr &= ~1UL;
1646 while (nr) {
1647 unsigned long h, l;
1648 l = *fdset++;
1649 h = l >> 32;
7116e994
HC		 1650 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1651 return -EFAULT;
1da177e4
LT		 1652 ufdset += 2;
1653 nr -= 2;
1654 }
7116e994
HC		 1655 if (odd && __put_user(*fdset, ufdset))
1656 return -EFAULT;
1657 return 0;
1da177e4
LT		 1658}
1659
1660
1661/*
1662 * This is a virtual copy of sys_select from fs/select.c and probably
1663 * should be compared to it from time to time
1664 */
1da177e4
LT		 1665
1666/*
1667 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1668 * like to be certain this leads to no problems. So I return
1669 * EINTR just for safety.
1670 *
1671 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1672 * I'm trying ERESTARTNOHAND which restart only when you want to.
1673 */
1674#define MAX_SELECT_SECONDS \
1675 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1676
9f72949f 1677int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1678 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1679 struct timespec *end_time)
1da177e4
LT		 1680{
1681 fd_set_bits fds;
6087b2da 1682 void *bits;
bbea9f69 1683 int size, max_fds, ret = -EINVAL;
a4531edd 1684 struct fdtable *fdt;
6087b2da 1685 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1686
1da177e4
LT		 1687 if (n < 0)
1688 goto out_nofds;
1689
bbea9f69 1690 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1691 rcu_read_lock();
a4531edd 1692 fdt = files_fdtable(current->files);
bbea9f69 1693 max_fds = fdt->max_fds;
ac5b8b6f 1694 rcu_read_unlock();
bbea9f69
VL		 1695 if (n > max_fds)
1696 n = max_fds;
1da177e4
LT		 1697
1698 /*
1699 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1700 * since we used fdset we need to allocate memory in units of
1701 * long-words.
1702 */
1da177e4 1703 size = FDS_BYTES(n);
6087b2da
BP		 1704 bits = stack_fds;
1705 if (size > sizeof(stack_fds) / 6) {
1706 bits = kmalloc(6 * size, GFP_KERNEL);
1707 ret = -ENOMEM;
1708 if (!bits)
1709 goto out_nofds;
1710 }
1da177e4
LT		 1711 fds.in = (unsigned long *) bits;
1712 fds.out = (unsigned long *) (bits + size);
1713 fds.ex = (unsigned long *) (bits + 2*size);
1714 fds.res_in = (unsigned long *) (bits + 3*size);
1715 fds.res_out = (unsigned long *) (bits + 4*size);
1716 fds.res_ex = (unsigned long *) (bits + 5*size);
1717
1718 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1719 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1720 (ret = compat_get_fd_set(n, exp, fds.ex)))
1721 goto out;
1722 zero_fd_set(n, fds.res_in);
1723 zero_fd_set(n, fds.res_out);
1724 zero_fd_set(n, fds.res_ex);
1725
8ff3e8e8 1726 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1727
1728 if (ret < 0)
1729 goto out;
1730 if (!ret) {
1731 ret = -ERESTARTNOHAND;
1732 if (signal_pending(current))
1733 goto out;
1734 ret = 0;
1735 }
1736
7116e994
HC		 1737 if (compat_set_fd_set(n, inp, fds.res_in) ||
1738 compat_set_fd_set(n, outp, fds.res_out) ||
1739 compat_set_fd_set(n, exp, fds.res_ex))
1740 ret = -EFAULT;
1da177e4 1741out:
6087b2da
BP		 1742 if (bits != stack_fds)
1743 kfree(bits);
1da177e4
LT		 1744out_nofds:
1745 return ret;
1746}
1747
9f72949f
DW		 1748asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1749 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1750 struct compat_timeval __user *tvp)
1751{
8ff3e8e8 1752 struct timespec end_time, *to = NULL;
9f72949f
DW		 1753 struct compat_timeval tv;
1754 int ret;
1755
1756 if (tvp) {
1757 if (copy_from_user(&tv, tvp, sizeof(tv)))
1758 return -EFAULT;
1759
8ff3e8e8 1760 to = &end_time;
4d36a9e6
AV		 1761 if (poll_select_set_timeout(to,
1762 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1763 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1764 return -EINVAL;
9f72949f
DW		 1765 }
1766
8ff3e8e8
AV		 1767 ret = compat_core_sys_select(n, inp, outp, exp, to);
1768 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1769
1770 return ret;
1771}
1772
f3de272b 1773#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1774static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1775 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1776 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1777 compat_size_t sigsetsize)
1778{
1779 compat_sigset_t ss32;
1780 sigset_t ksigmask, sigsaved;
9f72949f 1781 struct compat_timespec ts;
8ff3e8e8 1782 struct timespec end_time, *to = NULL;
9f72949f
DW		 1783 int ret;
1784
1785 if (tsp) {
1786 if (copy_from_user(&ts, tsp, sizeof(ts)))
1787 return -EFAULT;
1788
8ff3e8e8
AV		 1789 to = &end_time;
1790 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1791 return -EINVAL;
1792 }
1793
1794 if (sigmask) {
1795 if (sigsetsize != sizeof(compat_sigset_t))
1796 return -EINVAL;
1797 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1798 return -EFAULT;
1799 sigset_from_compat(&ksigmask, &ss32);
1800
1801 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1802 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1803 }
1804
8ff3e8e8
AV		 1805 ret = compat_core_sys_select(n, inp, outp, exp, to);
1806 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1807
1808 if (ret == -ERESTARTNOHAND) {
1809 /*
1810 * Don't restore the signal mask yet. Let do_signal() deliver
1811 * the signal on the way back to userspace, before the signal
1812 * mask is restored.
1813 */
1814 if (sigmask) {
1815 memcpy(&current->saved_sigmask, &sigsaved,
1816 sizeof(sigsaved));
4e4c22c7 1817 set_restore_sigmask();
9f72949f
DW		 1818 }
1819 } else if (sigmask)
1820 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1821
1822 return ret;
1823}
1824
1825asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1826 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1827 struct compat_timespec __user *tsp, void __user *sig)
1828{
1829 compat_size_t sigsetsize = 0;
1830 compat_uptr_t up = 0;
1831
1832 if (sig) {
1833 if (!access_ok(VERIFY_READ, sig,
1834 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1835 __get_user(up, (compat_uptr_t __user *)sig) ||
1836 __get_user(sigsetsize,
1837 (compat_size_t __user *)(sig+sizeof(up))))
1838 return -EFAULT;
1839 }
c9da9f21
HC		 1840 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1841 sigsetsize);
9f72949f
DW		 1842}
1843
1844asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1845 unsigned int nfds, struct compat_timespec __user *tsp,
1846 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1847{
1848 compat_sigset_t ss32;
1849 sigset_t ksigmask, sigsaved;
1850 struct compat_timespec ts;
8ff3e8e8 1851 struct timespec end_time, *to = NULL;
9f72949f
DW		 1852 int ret;
1853
1854 if (tsp) {
1855 if (copy_from_user(&ts, tsp, sizeof(ts)))
1856 return -EFAULT;
1857
8ff3e8e8
AV		 1858 to = &end_time;
1859 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1860 return -EINVAL;
9f72949f
DW		 1861 }
1862
1863 if (sigmask) {
3835a9bd 1864 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1865 return -EINVAL;
1866 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1867 return -EFAULT;
1868 sigset_from_compat(&ksigmask, &ss32);
1869
1870 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1871 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1872 }
1873
8ff3e8e8 1874 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1875
1876 /* We can restart this syscall, usually */
1877 if (ret == -EINTR) {
1878 /*
1879 * Don't restore the signal mask yet. Let do_signal() deliver
1880 * the signal on the way back to userspace, before the signal
1881 * mask is restored.
1882 */
1883 if (sigmask) {
1884 memcpy(&current->saved_sigmask, &sigsaved,
1885 sizeof(sigsaved));
4e4c22c7 1886 set_restore_sigmask();
9f72949f
DW		 1887 }
1888 ret = -ERESTARTNOHAND;
1889 } else if (sigmask)
1890 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1891
8ff3e8e8 1892 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1893
1894 return ret;
1895}
f3de272b 1896#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1897
1da177e4
LT		 1898#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1899/* Stuff for NFS server syscalls... */
1900struct compat_nfsctl_svc {
1901 u16 svc32_port;
1902 s32 svc32_nthreads;
1903};
1904
1905struct compat_nfsctl_client {
1906 s8 cl32_ident[NFSCLNT_IDMAX+1];
1907 s32 cl32_naddr;
1908 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1909 s32 cl32_fhkeytype;
1910 s32 cl32_fhkeylen;
1911 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1912};
1913
1914struct compat_nfsctl_export {
1915 char ex32_client[NFSCLNT_IDMAX+1];
1916 char ex32_path[NFS_MAXPATHLEN+1];
1917 compat_dev_t ex32_dev;
1918 compat_ino_t ex32_ino;
1919 compat_int_t ex32_flags;
202e5979
SR		 1920 __compat_uid_t ex32_anon_uid;
1921 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1922};
1923
1924struct compat_nfsctl_fdparm {
1925 struct sockaddr gd32_addr;
1926 s8 gd32_path[NFS_MAXPATHLEN+1];
1927 compat_int_t gd32_version;
1928};
1929
1930struct compat_nfsctl_fsparm {
1931 struct sockaddr gd32_addr;
1932 s8 gd32_path[NFS_MAXPATHLEN+1];
1933 compat_int_t gd32_maxlen;
1934};
1935
1936struct compat_nfsctl_arg {
1937 compat_int_t ca32_version; /* safeguard */
1938 union {
1939 struct compat_nfsctl_svc u32_svc;
1940 struct compat_nfsctl_client u32_client;
1941 struct compat_nfsctl_export u32_export;
1942 struct compat_nfsctl_fdparm u32_getfd;
1943 struct compat_nfsctl_fsparm u32_getfs;
1944 } u;
1945#define ca32_svc u.u32_svc
1946#define ca32_client u.u32_client
1947#define ca32_export u.u32_export
1948#define ca32_getfd u.u32_getfd
1949#define ca32_getfs u.u32_getfs
1950};
1951
1952union compat_nfsctl_res {
1953 __u8 cr32_getfh[NFS_FHSIZE];
1954 struct knfsd_fh cr32_getfs;
1955};
1956
d64b1c87
LFS		 1957static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1958 struct compat_nfsctl_arg __user *arg)
1da177e4 1959{
d64b1c87
LFS		 1960 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1961 get_user(karg->ca_version, &arg->ca32_version) ||
1962 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1963 __get_user(karg->ca_svc.svc_nthreads,
1964 &arg->ca32_svc.svc32_nthreads))
1965 return -EFAULT;
1966 return 0;
1da177e4
LT		 1967}
1968
d64b1c87
LFS		 1969static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1970 struct compat_nfsctl_arg __user *arg)
1da177e4 1971{
d64b1c87
LFS		 1972 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1973 sizeof(arg->ca32_client)) ||
1974 get_user(karg->ca_version, &arg->ca32_version) ||
1975 __copy_from_user(&karg->ca_client.cl_ident[0],
1976 &arg->ca32_client.cl32_ident[0],
1977 NFSCLNT_IDMAX) ||
1978 __get_user(karg->ca_client.cl_naddr,
1979 &arg->ca32_client.cl32_naddr) ||
1980 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1981 &arg->ca32_client.cl32_addrlist[0],
1982 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1983 __get_user(karg->ca_client.cl_fhkeytype,
1984 &arg->ca32_client.cl32_fhkeytype) ||
1985 __get_user(karg->ca_client.cl_fhkeylen,
1986 &arg->ca32_client.cl32_fhkeylen) ||
1987 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1988 &arg->ca32_client.cl32_fhkey[0],
1989 NFSCLNT_KEYMAX))
1990 return -EFAULT;
1da177e4 1991
d64b1c87 1992 return 0;
1da177e4
LT		 1993}
1994
d64b1c87
LFS		 1995static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1996 struct compat_nfsctl_arg __user *arg)
1da177e4 1997{
d64b1c87
LFS		 1998 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1999 sizeof(arg->ca32_export)) ||
2000 get_user(karg->ca_version, &arg->ca32_version) ||
2001 __copy_from_user(&karg->ca_export.ex_client[0],
2002 &arg->ca32_export.ex32_client[0],
2003 NFSCLNT_IDMAX) ||
2004 __copy_from_user(&karg->ca_export.ex_path[0],
2005 &arg->ca32_export.ex32_path[0],
2006 NFS_MAXPATHLEN) ||
2007 __get_user(karg->ca_export.ex_dev,
2008 &arg->ca32_export.ex32_dev) ||
2009 __get_user(karg->ca_export.ex_ino,
2010 &arg->ca32_export.ex32_ino) ||
2011 __get_user(karg->ca_export.ex_flags,
2012 &arg->ca32_export.ex32_flags) ||
2013 __get_user(karg->ca_export.ex_anon_uid,
2014 &arg->ca32_export.ex32_anon_uid) ||
2015 __get_user(karg->ca_export.ex_anon_gid,
2016 &arg->ca32_export.ex32_anon_gid))
2017 return -EFAULT;
1da177e4
LT		 2018 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2019 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2020
d64b1c87 2021 return 0;
1da177e4
LT		 2022}
2023
d64b1c87
LFS		 2024static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2025 struct compat_nfsctl_arg __user *arg)
1da177e4 2026{
d64b1c87
LFS		 2027 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2028 sizeof(arg->ca32_getfd)) ||
2029 get_user(karg->ca_version, &arg->ca32_version) ||
2030 __copy_from_user(&karg->ca_getfd.gd_addr,
2031 &arg->ca32_getfd.gd32_addr,
2032 (sizeof(struct sockaddr))) ||
2033 __copy_from_user(&karg->ca_getfd.gd_path,
2034 &arg->ca32_getfd.gd32_path,
2035 (NFS_MAXPATHLEN+1)) ||
2036 __get_user(karg->ca_getfd.gd_version,
2037 &arg->ca32_getfd.gd32_version))
2038 return -EFAULT;
1da177e4 2039
d64b1c87 2040 return 0;
1da177e4
LT		 2041}
2042
d64b1c87
LFS		 2043static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2044 struct compat_nfsctl_arg __user *arg)
1da177e4 2045{
d64b1c87
LFS		 2046 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2047 get_user(karg->ca_version, &arg->ca32_version) ||
2048 __copy_from_user(&karg->ca_getfs.gd_addr,
2049 &arg->ca32_getfs.gd32_addr,
2050 (sizeof(struct sockaddr))) ||
2051 __copy_from_user(&karg->ca_getfs.gd_path,
2052 &arg->ca32_getfs.gd32_path,
2053 (NFS_MAXPATHLEN+1)) ||
2054 __get_user(karg->ca_getfs.gd_maxlen,
2055 &arg->ca32_getfs.gd32_maxlen))
2056 return -EFAULT;
1da177e4 2057
d64b1c87 2058 return 0;
1da177e4
LT		 2059}
2060
2061/* This really doesn't need translations, we are only passing
2062 * back a union which contains opaque nfs file handle data.
2063 */
d64b1c87
LFS		 2064static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2065 union compat_nfsctl_res __user *res)
1da177e4
LT		 2066{
2067 int err;
2068
2069 err = copy_to_user(res, kres, sizeof(*res));
2070
2071 return (err) ? -EFAULT : 0;
2072}
2073
d64b1c87
LFS		 2074asmlinkage long compat_sys_nfsservctl(int cmd,
2075 struct compat_nfsctl_arg __user *arg,
2076 union compat_nfsctl_res __user *res)
1da177e4
LT		 2077{
2078 struct nfsctl_arg *karg;
2079 union nfsctl_res *kres;
2080 mm_segment_t oldfs;
2081 int err;
2082
2083 karg = kmalloc(sizeof(*karg), GFP_USER);
2084 kres = kmalloc(sizeof(*kres), GFP_USER);
2085 if(!karg || !kres) {
2086 err = -ENOMEM;
2087 goto done;
2088 }
2089
2090 switch(cmd) {
2091 case NFSCTL_SVC:
2092 err = compat_nfs_svc_trans(karg, arg);
2093 break;
2094
2095 case NFSCTL_ADDCLIENT:
2096 err = compat_nfs_clnt_trans(karg, arg);
2097 break;
2098
2099 case NFSCTL_DELCLIENT:
2100 err = compat_nfs_clnt_trans(karg, arg);
2101 break;
2102
2103 case NFSCTL_EXPORT:
2104 case NFSCTL_UNEXPORT:
2105 err = compat_nfs_exp_trans(karg, arg);
2106 break;
2107
2108 case NFSCTL_GETFD:
2109 err = compat_nfs_getfd_trans(karg, arg);
2110 break;
2111
2112 case NFSCTL_GETFS:
2113 err = compat_nfs_getfs_trans(karg, arg);
2114 break;
2115
2116 default:
2117 err = -EINVAL;
57070d01 2118 break;
1da177e4
LT		 2119 }
2120
57070d01
PS		 2121 if (err)
2122 goto done;
2123
1da177e4
LT		 2124 oldfs = get_fs();
2125 set_fs(KERNEL_DS);
2126 /* The __user pointer casts are valid because of the set_fs() */
2127 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2128 set_fs(oldfs);
2129
2130 if (err)
2131 goto done;
2132
2133 if((cmd == NFSCTL_GETFD) ||
2134 (cmd == NFSCTL_GETFS))
2135 err = compat_nfs_getfh_res_trans(kres, res);
2136
2137done:
2138 kfree(karg);
2139 kfree(kres);
2140 return err;
2141}
2142#else /* !NFSD */
2143long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2144{
2145 return sys_ni_syscall();
2146}
2147#endif
f6dfb4fd
DL		 2148
2149#ifdef CONFIG_EPOLL
2150
f3de272b 2151#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2152asmlinkage long compat_sys_epoll_pwait(int epfd,
2153 struct compat_epoll_event __user *events,
2154 int maxevents, int timeout,
2155 const compat_sigset_t __user *sigmask,
2156 compat_size_t sigsetsize)
2157{
2158 long err;
2159 compat_sigset_t csigmask;
2160 sigset_t ksigmask, sigsaved;
2161
2162 /*
2163 * If the caller wants a certain signal mask to be set during the wait,
2164 * we apply it here.
2165 */
2166 if (sigmask) {
2167 if (sigsetsize != sizeof(compat_sigset_t))
2168 return -EINVAL;
2169 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2170 return -EFAULT;
2171 sigset_from_compat(&ksigmask, &csigmask);
2172 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2173 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2174 }
2175
f6dfb4fd 2176 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2177
2178 /*
2179 * If we changed the signal mask, we need to restore the original one.
2180 * In case we've got a signal while waiting, we do not restore the
2181 * signal mask yet, and we allow do_signal() to deliver the signal on
2182 * the way back to userspace, before the signal mask is restored.
2183 */
2184 if (sigmask) {
2185 if (err == -EINTR) {
2186 memcpy(&current->saved_sigmask, &sigsaved,
2187 sizeof(sigsaved));
4e4c22c7 2188 set_restore_sigmask();
f6dfb4fd
DL		 2189 } else
2190 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2191 }
2192
2193 return err;
2194}
f3de272b 2195#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2196
2197#endif /* CONFIG_EPOLL */
6d18c922
DL		 2198
2199#ifdef CONFIG_SIGNALFD
2200
9deb27ba
UD		 2201asmlinkage long compat_sys_signalfd4(int ufd,
2202 const compat_sigset_t __user *sigmask,
2203 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2204{
2205 compat_sigset_t ss32;
2206 sigset_t tmp;
2207 sigset_t __user *ksigmask;
2208
2209 if (sigsetsize != sizeof(compat_sigset_t))
2210 return -EINVAL;
2211 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2212 return -EFAULT;
2213 sigset_from_compat(&tmp, &ss32);
2214 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2215 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2216 return -EFAULT;
2217
9deb27ba 2218 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2219}
2220
9deb27ba
UD		 2221asmlinkage long compat_sys_signalfd(int ufd,
2222 const compat_sigset_t __user *sigmask,
2223 compat_size_t sigsetsize)
2224{
2225 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2226}
6d18c922
DL		 2227#endif /* CONFIG_SIGNALFD */
2228
83f5d126
DL		 2229#ifdef CONFIG_TIMERFD
2230
4d672e7a
DL		 2231asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2232 const struct compat_itimerspec __user *utmr,
2233 struct compat_itimerspec __user *otmr)
83f5d126 2234{
4d672e7a 2235 int error;
83f5d126
DL		 2236 struct itimerspec t;
2237 struct itimerspec __user *ut;
2238
83f5d126 2239 if (get_compat_itimerspec(&t, utmr))
8317f14b 2240 return -EFAULT;
4d672e7a
DL		 2241 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2242 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2243 return -EFAULT;
4d672e7a
DL		 2244 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2245 if (!error && otmr)
2246 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2247 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2248
2249 return error;
2250}
2251
2252asmlinkage long compat_sys_timerfd_gettime(int ufd,
2253 struct compat_itimerspec __user *otmr)
2254{
2255 int error;
2256 struct itimerspec t;
2257 struct itimerspec __user *ut;
83f5d126 2258
4d672e7a
DL		 2259 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2260 error = sys_timerfd_gettime(ufd, ut);
2261 if (!error)
2262 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2263 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2264
2265 return error;
83f5d126
DL		 2266}
2267
2268#endif /* CONFIG_TIMERFD */
Linux 6.x block layer and io_uring tree(s)