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open-style analog of vfs_path_lookup()
[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
a2531293 11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
1da177e4
LT		 12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
85c9fe8f 18#include <linux/stddef.h>
022a1692 19#include <linux/kernel.h>
1da177e4
LT		 20#include <linux/linkage.h>
21#include <linux/compat.h>
22#include <linux/errno.h>
23#include <linux/time.h>
24#include <linux/fs.h>
25#include <linux/fcntl.h>
26#include <linux/namei.h>
27#include <linux/file.h>
9f3acc31 28#include <linux/fdtable.h>
1da177e4 29#include <linux/vfs.h>
1da177e4
LT		 30#include <linux/ioctl.h>
31#include <linux/init.h>
1da177e4 32#include <linux/ncp_mount.h>
9a9947bf 33#include <linux/nfs4_mount.h>
1da177e4
LT		 34#include <linux/syscalls.h>
35#include <linux/ctype.h>
36#include <linux/module.h>
37#include <linux/dirent.h>
0eeca283 38#include <linux/fsnotify.h>
1da177e4 39#include <linux/highuid.h>
1da177e4
LT		 40#include <linux/nfsd/syscall.h>
41#include <linux/personality.h>
42#include <linux/rwsem.h>
8f0ab514 43#include <linux/tsacct_kern.h>
6272e266 44#include <linux/security.h>
a1f8e7f7 45#include <linux/highmem.h>
6d18c922 46#include <linux/signal.h>
bd01f843 47#include <linux/poll.h>
4a805e86 48#include <linux/mm.h>
f6dfb4fd 49#include <linux/eventpoll.h>
498052bb 50#include <linux/fs_struct.h>
5a0e3ad6 51#include <linux/slab.h>
504b701b 52#include <linux/pagemap.h>
1da177e4 53
1da177e4
LT		 54#include <asm/uaccess.h>
55#include <asm/mmu_context.h>
56#include <asm/ioctls.h>
07f3f05c 57#include "internal.h"
9f72949f 58
bebfa101
AK		 59int compat_log = 1;
60
61int compat_printk(const char *fmt, ...)
62{
63 va_list ap;
64 int ret;
65 if (!compat_log)
66 return 0;
67 va_start(ap, fmt);
68 ret = vprintk(fmt, ap);
69 va_end(ap);
70 return ret;
71}
72
ee0b3e67
BP		 73#include "read_write.h"
74
1da177e4
LT		 75/*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
c7887325
DH		 79asmlinkage long compat_sys_utime(const char __user *filename,
80 struct compat_utimbuf __user *t)
1da177e4 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
c7887325 94asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
1c710c89
UD		 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
c7887325 109asmlinkage long compat_sys_futimesat(unsigned int dfd, const 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
c7887325 128asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
5590ff0d
UD		 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
c7887325 172asmlinkage long compat_sys_newstat(const char __user * filename,
1da177e4
LT		 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
c7887325 184asmlinkage long compat_sys_newlstat(const char __user * filename,
1da177e4
LT		 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
c7887325
DH		 197asmlinkage long compat_sys_newfstatat(unsigned int dfd,
198 const char __user *filename,
5590ff0d
UD		 199 struct compat_stat __user *statbuf, int flag)
200{
201 struct kstat stat;
0112fc22 202 int error;
5590ff0d 203
0112fc22
OD		 204 error = vfs_fstatat(dfd, filename, &stat, flag);
205 if (error)
206 return error;
207 return cp_compat_stat(&stat, statbuf);
5590ff0d 208}
82d821dd 209#endif
5590ff0d 210
1da177e4
LT		 211asmlinkage long compat_sys_newfstat(unsigned int fd,
212 struct compat_stat __user * statbuf)
213{
214 struct kstat stat;
215 int error = vfs_fstat(fd, &stat);
216
217 if (!error)
218 error = cp_compat_stat(&stat, statbuf);
219 return error;
220}
221
222static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
223{
224
225 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 226 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
227 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 228 return -EOVERFLOW;
229 /* f_files and f_ffree may be -1; it's okay
230 * to stuff that into 32 bits */
231 if (kbuf->f_files != 0xffffffffffffffffULL
232 && (kbuf->f_files & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 if (kbuf->f_ffree != 0xffffffffffffffffULL
235 && (kbuf->f_ffree & 0xffffffff00000000ULL))
236 return -EOVERFLOW;
237 }
238 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
239 __put_user(kbuf->f_type, &ubuf->f_type) ||
240 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
241 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
242 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
243 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
244 __put_user(kbuf->f_files, &ubuf->f_files) ||
245 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
246 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
247 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
248 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
249 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
250 __put_user(0, &ubuf->f_spare[0]) ||
251 __put_user(0, &ubuf->f_spare[1]) ||
252 __put_user(0, &ubuf->f_spare[2]) ||
253 __put_user(0, &ubuf->f_spare[3]) ||
254 __put_user(0, &ubuf->f_spare[4]))
255 return -EFAULT;
256 return 0;
257}
258
259/*
974d879e 260 * The following statfs calls are copies of code from fs/statfs.c and
1da177e4
LT		 261 * should be checked against those from time to time
262 */
2d8f3038 263asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
1da177e4 264{
2d8f3038 265 struct path path;
1da177e4
LT		 266 int error;
267
2d8f3038 268 error = user_path(pathname, &path);
1da177e4
LT		 269 if (!error) {
270 struct kstatfs tmp;
ebabe9a9 271 error = vfs_statfs(&path, &tmp);
86e07ce7
DG		 272 if (!error)
273 error = put_compat_statfs(buf, &tmp);
2d8f3038 274 path_put(&path);
1da177e4
LT		 275 }
276 return error;
277}
278
279asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
280{
281 struct file * file;
282 struct kstatfs tmp;
283 int error;
284
285 error = -EBADF;
286 file = fget(fd);
287 if (!file)
288 goto out;
ebabe9a9 289 error = vfs_statfs(&file->f_path, &tmp);
86e07ce7
DG		 290 if (!error)
291 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 292 fput(file);
293out:
294 return error;
295}
296
297static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
298{
299 if (sizeof ubuf->f_blocks == 4) {
f4a67cce
JT		 300 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
301 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
1da177e4
LT		 302 return -EOVERFLOW;
303 /* f_files and f_ffree may be -1; it's okay
304 * to stuff that into 32 bits */
305 if (kbuf->f_files != 0xffffffffffffffffULL
306 && (kbuf->f_files & 0xffffffff00000000ULL))
307 return -EOVERFLOW;
308 if (kbuf->f_ffree != 0xffffffffffffffffULL
309 && (kbuf->f_ffree & 0xffffffff00000000ULL))
310 return -EOVERFLOW;
311 }
312 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
313 __put_user(kbuf->f_type, &ubuf->f_type) ||
314 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
315 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
316 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
317 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
318 __put_user(kbuf->f_files, &ubuf->f_files) ||
319 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
320 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
321 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
322 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
e0bb6bda
NK		 323 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
324 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
325 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
1da177e4
LT		 326 return -EFAULT;
327 return 0;
328}
329
2d8f3038 330asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
1da177e4 331{
2d8f3038 332 struct path path;
1da177e4
LT		 333 int error;
334
335 if (sz != sizeof(*buf))
336 return -EINVAL;
337
2d8f3038 338 error = user_path(pathname, &path);
1da177e4
LT		 339 if (!error) {
340 struct kstatfs tmp;
ebabe9a9 341 error = vfs_statfs(&path, &tmp);
86e07ce7
DG		 342 if (!error)
343 error = put_compat_statfs64(buf, &tmp);
2d8f3038 344 path_put(&path);
1da177e4
LT		 345 }
346 return error;
347}
348
349asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
350{
351 struct file * file;
352 struct kstatfs tmp;
353 int error;
354
355 if (sz != sizeof(*buf))
356 return -EINVAL;
357
358 error = -EBADF;
359 file = fget(fd);
360 if (!file)
361 goto out;
ebabe9a9 362 error = vfs_statfs(&file->f_path, &tmp);
86e07ce7
DG		 363 if (!error)
364 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 365 fput(file);
366out:
367 return error;
368}
369
2b1c6bd7
CH		 370/*
371 * This is a copy of sys_ustat, just dealing with a structure layout.
372 * Given how simple this syscall is that apporach is more maintainable
373 * than the various conversion hacks.
374 */
375asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
376{
377 struct super_block *sb;
378 struct compat_ustat tmp;
379 struct kstatfs sbuf;
380 int err;
381
382 sb = user_get_super(new_decode_dev(dev));
383 if (!sb)
384 return -EINVAL;
ebabe9a9 385 err = statfs_by_dentry(sb->s_root, &sbuf);
2b1c6bd7
CH		 386 drop_super(sb);
387 if (err)
388 return err;
389
390 memset(&tmp, 0, sizeof(struct compat_ustat));
391 tmp.f_tfree = sbuf.f_bfree;
392 tmp.f_tinode = sbuf.f_ffree;
393 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
394 return -EFAULT;
395 return 0;
396}
397
1da177e4
LT		 398static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
399{
400 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
401 __get_user(kfl->l_type, &ufl->l_type) ||
402 __get_user(kfl->l_whence, &ufl->l_whence) ||
403 __get_user(kfl->l_start, &ufl->l_start) ||
404 __get_user(kfl->l_len, &ufl->l_len) ||
405 __get_user(kfl->l_pid, &ufl->l_pid))
406 return -EFAULT;
407 return 0;
408}
409
410static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
411{
412 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
413 __put_user(kfl->l_type, &ufl->l_type) ||
414 __put_user(kfl->l_whence, &ufl->l_whence) ||
415 __put_user(kfl->l_start, &ufl->l_start) ||
416 __put_user(kfl->l_len, &ufl->l_len) ||
417 __put_user(kfl->l_pid, &ufl->l_pid))
418 return -EFAULT;
419 return 0;
420}
421
422#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
423static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
424{
425 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
426 __get_user(kfl->l_type, &ufl->l_type) ||
427 __get_user(kfl->l_whence, &ufl->l_whence) ||
428 __get_user(kfl->l_start, &ufl->l_start) ||
429 __get_user(kfl->l_len, &ufl->l_len) ||
430 __get_user(kfl->l_pid, &ufl->l_pid))
431 return -EFAULT;
432 return 0;
433}
434#endif
435
436#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
437static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
438{
439 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
440 __put_user(kfl->l_type, &ufl->l_type) ||
441 __put_user(kfl->l_whence, &ufl->l_whence) ||
442 __put_user(kfl->l_start, &ufl->l_start) ||
443 __put_user(kfl->l_len, &ufl->l_len) ||
444 __put_user(kfl->l_pid, &ufl->l_pid))
445 return -EFAULT;
446 return 0;
447}
448#endif
449
450asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
451 unsigned long arg)
452{
453 mm_segment_t old_fs;
454 struct flock f;
455 long ret;
456
457 switch (cmd) {
458 case F_GETLK:
459 case F_SETLK:
460 case F_SETLKW:
461 ret = get_compat_flock(&f, compat_ptr(arg));
462 if (ret != 0)
463 break;
464 old_fs = get_fs();
465 set_fs(KERNEL_DS);
466 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
467 set_fs(old_fs);
468 if (cmd == F_GETLK && ret == 0) {
ff677f8d 469 /* GETLK was successful and we need to return the data...
2520f14c
N		 470 * but it needs to fit in the compat structure.
471 * l_start shouldn't be too big, unless the original
472 * start + end is greater than COMPAT_OFF_T_MAX, in which
473 * case the app was asking for trouble, so we return
474 * -EOVERFLOW in that case.
475 * l_len could be too big, in which case we just truncate it,
476 * and only allow the app to see that part of the conflicting
477 * lock that might make sense to it anyway
478 */
479
480 if (f.l_start > COMPAT_OFF_T_MAX)
1da177e4 481 ret = -EOVERFLOW;
2520f14c
N		 482 if (f.l_len > COMPAT_OFF_T_MAX)
483 f.l_len = COMPAT_OFF_T_MAX;
1da177e4
LT		 484 if (ret == 0)
485 ret = put_compat_flock(&f, compat_ptr(arg));
486 }
487 break;
488
489 case F_GETLK64:
490 case F_SETLK64:
491 case F_SETLKW64:
492 ret = get_compat_flock64(&f, compat_ptr(arg));
493 if (ret != 0)
494 break;
495 old_fs = get_fs();
496 set_fs(KERNEL_DS);
497 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
498 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
499 (unsigned long)&f);
500 set_fs(old_fs);
501 if (cmd == F_GETLK64 && ret == 0) {
2520f14c
N		 502 /* need to return lock information - see above for commentary */
503 if (f.l_start > COMPAT_LOFF_T_MAX)
1da177e4 504 ret = -EOVERFLOW;
2520f14c
N		 505 if (f.l_len > COMPAT_LOFF_T_MAX)
506 f.l_len = COMPAT_LOFF_T_MAX;
1da177e4
LT		 507 if (ret == 0)
508 ret = put_compat_flock64(&f, compat_ptr(arg));
509 }
510 break;
511
512 default:
513 ret = sys_fcntl(fd, cmd, arg);
514 break;
515 }
516 return ret;
517}
518
519asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
520 unsigned long arg)
521{
522 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
523 return -EINVAL;
524 return compat_sys_fcntl64(fd, cmd, arg);
525}
526
527asmlinkage long
528compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
529{
530 long ret;
531 aio_context_t ctx64;
532
533 mm_segment_t oldfs = get_fs();
534 if (unlikely(get_user(ctx64, ctx32p)))
535 return -EFAULT;
536
537 set_fs(KERNEL_DS);
538 /* The __user pointer cast is valid because of the set_fs() */
539 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
540 set_fs(oldfs);
541 /* truncating is ok because it's a user address */
542 if (!ret)
543 ret = put_user((u32) ctx64, ctx32p);
544 return ret;
545}
546
547asmlinkage long
548compat_sys_io_getevents(aio_context_t ctx_id,
549 unsigned long min_nr,
550 unsigned long nr,
551 struct io_event __user *events,
552 struct compat_timespec __user *timeout)
553{
554 long ret;
555 struct timespec t;
556 struct timespec __user *ut = NULL;
557
558 ret = -EFAULT;
559 if (unlikely(!access_ok(VERIFY_WRITE, events,
560 nr * sizeof(struct io_event))))
561 goto out;
562 if (timeout) {
563 if (get_compat_timespec(&t, timeout))
564 goto out;
565
566 ut = compat_alloc_user_space(sizeof(*ut));
567 if (copy_to_user(ut, &t, sizeof(t)) )
568 goto out;
569 }
570 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
571out:
572 return ret;
573}
574
b8373363
JM		 575/* A write operation does a read from user space and vice versa */
576#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
577
578ssize_t compat_rw_copy_check_uvector(int type,
579 const struct compat_iovec __user *uvector, unsigned long nr_segs,
580 unsigned long fast_segs, struct iovec *fast_pointer,
581 struct iovec **ret_pointer)
582{
583 compat_ssize_t tot_len;
584 struct iovec *iov = *ret_pointer = fast_pointer;
585 ssize_t ret = 0;
586 int seg;
587
588 /*
589 * SuS says "The readv() function *may* fail if the iovcnt argument
590 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
591 * traditionally returned zero for zero segments, so...
592 */
593 if (nr_segs == 0)
594 goto out;
595
596 ret = -EINVAL;
597 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
598 goto out;
599 if (nr_segs > fast_segs) {
600 ret = -ENOMEM;
601 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
6a5640f1 602 if (iov == NULL)
b8373363 603 goto out;
b8373363
JM		 604 }
605 *ret_pointer = iov;
606
607 /*
608 * Single unix specification:
609 * We should -EINVAL if an element length is not >= 0 and fitting an
435f49a5 610 * ssize_t.
b8373363 611 *
435f49a5
LT		 612 * In Linux, the total length is limited to MAX_RW_COUNT, there is
613 * no overflow possibility.
b8373363
JM		 614 */
615 tot_len = 0;
616 ret = -EINVAL;
617 for (seg = 0; seg < nr_segs; seg++) {
b8373363
JM		 618 compat_uptr_t buf;
619 compat_ssize_t len;
620
621 if (__get_user(len, &uvector->iov_len) ||
622 __get_user(buf, &uvector->iov_base)) {
623 ret = -EFAULT;
624 goto out;
625 }
626 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
627 goto out;
7cbe1770 628 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
b8373363
JM		 629 ret = -EFAULT;
630 goto out;
631 }
435f49a5
LT		 632 if (len > MAX_RW_COUNT - tot_len)
633 len = MAX_RW_COUNT - tot_len;
634 tot_len += len;
b8373363
JM		 635 iov->iov_base = compat_ptr(buf);
636 iov->iov_len = (compat_size_t) len;
637 uvector++;
638 iov++;
639 }
640 ret = tot_len;
641
642out:
643 return ret;
644}
645
1da177e4
LT		 646static inline long
647copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
648{
649 compat_uptr_t uptr;
650 int i;
651
652 for (i = 0; i < nr; ++i) {
653 if (get_user(uptr, ptr32 + i))
654 return -EFAULT;
655 if (put_user(compat_ptr(uptr), ptr64 + i))
656 return -EFAULT;
657 }
658 return 0;
659}
660
661#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
662
663asmlinkage long
664compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
665{
666 struct iocb __user * __user *iocb64;
667 long ret;
668
669 if (unlikely(nr < 0))
670 return -EINVAL;
671
672 if (nr > MAX_AIO_SUBMITS)
673 nr = MAX_AIO_SUBMITS;
674
675 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
676 ret = copy_iocb(nr, iocb, iocb64);
677 if (!ret)
9d85cba7 678 ret = do_io_submit(ctx_id, nr, iocb64, 1);
1da177e4
LT		 679 return ret;
680}
681
682struct compat_ncp_mount_data {
683 compat_int_t version;
684 compat_uint_t ncp_fd;
202e5979 685 __compat_uid_t mounted_uid;
1da177e4
LT		 686 compat_pid_t wdog_pid;
687 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
688 compat_uint_t time_out;
689 compat_uint_t retry_count;
690 compat_uint_t flags;
202e5979
SR		 691 __compat_uid_t uid;
692 __compat_gid_t gid;
1da177e4
LT		 693 compat_mode_t file_mode;
694 compat_mode_t dir_mode;
695};
696
697struct compat_ncp_mount_data_v4 {
698 compat_int_t version;
699 compat_ulong_t flags;
700 compat_ulong_t mounted_uid;
701 compat_long_t wdog_pid;
702 compat_uint_t ncp_fd;
703 compat_uint_t time_out;
704 compat_uint_t retry_count;
705 compat_ulong_t uid;
706 compat_ulong_t gid;
707 compat_ulong_t file_mode;
708 compat_ulong_t dir_mode;
709};
710
711static void *do_ncp_super_data_conv(void *raw_data)
712{
713 int version = *(unsigned int *)raw_data;
714
715 if (version == 3) {
716 struct compat_ncp_mount_data *c_n = raw_data;
717 struct ncp_mount_data *n = raw_data;
718
719 n->dir_mode = c_n->dir_mode;
720 n->file_mode = c_n->file_mode;
721 n->gid = c_n->gid;
722 n->uid = c_n->uid;
723 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
724 n->wdog_pid = c_n->wdog_pid;
725 n->mounted_uid = c_n->mounted_uid;
726 } else if (version == 4) {
727 struct compat_ncp_mount_data_v4 *c_n = raw_data;
728 struct ncp_mount_data_v4 *n = raw_data;
729
730 n->dir_mode = c_n->dir_mode;
731 n->file_mode = c_n->file_mode;
732 n->gid = c_n->gid;
733 n->uid = c_n->uid;
734 n->retry_count = c_n->retry_count;
735 n->time_out = c_n->time_out;
736 n->ncp_fd = c_n->ncp_fd;
737 n->wdog_pid = c_n->wdog_pid;
738 n->mounted_uid = c_n->mounted_uid;
739 n->flags = c_n->flags;
740 } else if (version != 5) {
741 return NULL;
742 }
743
744 return raw_data;
745}
746
1da177e4 747
9a9947bf
DH		 748struct compat_nfs_string {
749 compat_uint_t len;
5fc3e624 750 compat_uptr_t data;
9a9947bf
DH		 751};
752
753static inline void compat_nfs_string(struct nfs_string *dst,
754 struct compat_nfs_string *src)
755{
756 dst->data = compat_ptr(src->data);
757 dst->len = src->len;
758}
759
760struct compat_nfs4_mount_data_v1 {
761 compat_int_t version;
762 compat_int_t flags;
763 compat_int_t rsize;
764 compat_int_t wsize;
765 compat_int_t timeo;
766 compat_int_t retrans;
767 compat_int_t acregmin;
768 compat_int_t acregmax;
769 compat_int_t acdirmin;
770 compat_int_t acdirmax;
771 struct compat_nfs_string client_addr;
772 struct compat_nfs_string mnt_path;
773 struct compat_nfs_string hostname;
774 compat_uint_t host_addrlen;
5fc3e624 775 compat_uptr_t host_addr;
9a9947bf
DH		 776 compat_int_t proto;
777 compat_int_t auth_flavourlen;
5fc3e624 778 compat_uptr_t auth_flavours;
9a9947bf
DH		 779};
780
781static int do_nfs4_super_data_conv(void *raw_data)
782{
783 int version = *(compat_uint_t *) raw_data;
784
785 if (version == 1) {
786 struct compat_nfs4_mount_data_v1 *raw = raw_data;
787 struct nfs4_mount_data *real = raw_data;
788
789 /* copy the fields backwards */
790 real->auth_flavours = compat_ptr(raw->auth_flavours);
791 real->auth_flavourlen = raw->auth_flavourlen;
792 real->proto = raw->proto;
793 real->host_addr = compat_ptr(raw->host_addr);
794 real->host_addrlen = raw->host_addrlen;
795 compat_nfs_string(&real->hostname, &raw->hostname);
796 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
797 compat_nfs_string(&real->client_addr, &raw->client_addr);
798 real->acdirmax = raw->acdirmax;
799 real->acdirmin = raw->acdirmin;
800 real->acregmax = raw->acregmax;
801 real->acregmin = raw->acregmin;
802 real->retrans = raw->retrans;
803 real->timeo = raw->timeo;
804 real->wsize = raw->wsize;
805 real->rsize = raw->rsize;
806 real->flags = raw->flags;
807 real->version = raw->version;
808 }
9a9947bf
DH		 809
810 return 0;
811}
812
1da177e4 813#define NCPFS_NAME "ncpfs"
9a9947bf 814#define NFS4_NAME "nfs4"
1da177e4 815
c7887325
DH		 816asmlinkage long compat_sys_mount(const char __user * dev_name,
817 const char __user * dir_name,
818 const char __user * type, unsigned long flags,
819 const void __user * data)
1da177e4 820{
eca6f534 821 char *kernel_type;
1da177e4 822 unsigned long data_page;
eca6f534 823 char *kernel_dev;
1da177e4
LT		 824 char *dir_page;
825 int retval;
826
eca6f534 827 retval = copy_mount_string(type, &kernel_type);
1da177e4
LT		 828 if (retval < 0)
829 goto out;
830
831 dir_page = getname(dir_name);
832 retval = PTR_ERR(dir_page);
833 if (IS_ERR(dir_page))
834 goto out1;
835
eca6f534 836 retval = copy_mount_string(dev_name, &kernel_dev);
1da177e4
LT		 837 if (retval < 0)
838 goto out2;
839
eca6f534 840 retval = copy_mount_options(data, &data_page);
1da177e4
LT		 841 if (retval < 0)
842 goto out3;
843
844 retval = -EINVAL;
845
eca6f534 846 if (kernel_type && data_page) {
2116b7a4 847 if (!strcmp(kernel_type, NCPFS_NAME)) {
1da177e4 848 do_ncp_super_data_conv((void *)data_page);
eca6f534 849 } else if (!strcmp(kernel_type, NFS4_NAME)) {
9a9947bf
DH		 850 if (do_nfs4_super_data_conv((void *) data_page))
851 goto out4;
1da177e4
LT		 852 }
853 }
854
eca6f534 855 retval = do_mount(kernel_dev, dir_page, kernel_type,
1da177e4 856 flags, (void*)data_page);
1da177e4 857
9a9947bf 858 out4:
1da177e4
LT		 859 free_page(data_page);
860 out3:
eca6f534 861 kfree(kernel_dev);
1da177e4
LT		 862 out2:
863 putname(dir_page);
864 out1:
eca6f534 865 kfree(kernel_type);
1da177e4
LT		 866 out:
867 return retval;
868}
869
1da177e4
LT		 870struct compat_old_linux_dirent {
871 compat_ulong_t d_ino;
872 compat_ulong_t d_offset;
873 unsigned short d_namlen;
874 char d_name[1];
875};
876
877struct compat_readdir_callback {
878 struct compat_old_linux_dirent __user *dirent;
879 int result;
880};
881
882static int compat_fillonedir(void *__buf, const char *name, int namlen,
afefdbb2 883 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 884{
885 struct compat_readdir_callback *buf = __buf;
886 struct compat_old_linux_dirent __user *dirent;
afefdbb2 887 compat_ulong_t d_ino;
1da177e4
LT		 888
889 if (buf->result)
890 return -EINVAL;
afefdbb2 891 d_ino = ino;
8f3f655d
AV		 892 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
893 buf->result = -EOVERFLOW;
afefdbb2 894 return -EOVERFLOW;
8f3f655d 895 }
1da177e4
LT		 896 buf->result++;
897 dirent = buf->dirent;
898 if (!access_ok(VERIFY_WRITE, dirent,
899 (unsigned long)(dirent->d_name + namlen + 1) -
900 (unsigned long)dirent))
901 goto efault;
afefdbb2 902 if ( __put_user(d_ino, &dirent->d_ino) ||
1da177e4
LT		 903 __put_user(offset, &dirent->d_offset) ||
904 __put_user(namlen, &dirent->d_namlen) ||
905 __copy_to_user(dirent->d_name, name, namlen) ||
906 __put_user(0, dirent->d_name + namlen))
907 goto efault;
908 return 0;
909efault:
910 buf->result = -EFAULT;
911 return -EFAULT;
912}
913
914asmlinkage long compat_sys_old_readdir(unsigned int fd,
915 struct compat_old_linux_dirent __user *dirent, unsigned int count)
916{
917 int error;
918 struct file *file;
919 struct compat_readdir_callback buf;
920
921 error = -EBADF;
922 file = fget(fd);
923 if (!file)
924 goto out;
925
926 buf.result = 0;
927 buf.dirent = dirent;
928
929 error = vfs_readdir(file, compat_fillonedir, &buf);
53c9c5c0 930 if (buf.result)
1da177e4
LT		 931 error = buf.result;
932
933 fput(file);
934out:
935 return error;
936}
937
938struct compat_linux_dirent {
939 compat_ulong_t d_ino;
940 compat_ulong_t d_off;
941 unsigned short d_reclen;
942 char d_name[1];
943};
944
945struct compat_getdents_callback {
946 struct compat_linux_dirent __user *current_dir;
947 struct compat_linux_dirent __user *previous;
948 int count;
949 int error;
950};
951
952static int compat_filldir(void *__buf, const char *name, int namlen,
afefdbb2 953 loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT		 954{
955 struct compat_linux_dirent __user * dirent;
956 struct compat_getdents_callback *buf = __buf;
afefdbb2 957 compat_ulong_t d_ino;
85c9fe8f
KW		 958 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
959 namlen + 2, sizeof(compat_long_t));
1da177e4
LT		 960
961 buf->error = -EINVAL; /* only used if we fail.. */
962 if (reclen > buf->count)
963 return -EINVAL;
afefdbb2 964 d_ino = ino;
8f3f655d
AV		 965 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
966 buf->error = -EOVERFLOW;
afefdbb2 967 return -EOVERFLOW;
8f3f655d 968 }
1da177e4
LT		 969 dirent = buf->previous;
970 if (dirent) {
971 if (__put_user(offset, &dirent->d_off))
972 goto efault;
973 }
974 dirent = buf->current_dir;
afefdbb2 975 if (__put_user(d_ino, &dirent->d_ino))
1da177e4
LT		 976 goto efault;
977 if (__put_user(reclen, &dirent->d_reclen))
978 goto efault;
979 if (copy_to_user(dirent->d_name, name, namlen))
980 goto efault;
981 if (__put_user(0, dirent->d_name + namlen))
982 goto efault;
983 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
984 goto efault;
985 buf->previous = dirent;
986 dirent = (void __user *)dirent + reclen;
987 buf->current_dir = dirent;
988 buf->count -= reclen;
989 return 0;
990efault:
991 buf->error = -EFAULT;
992 return -EFAULT;
993}
994
995asmlinkage long compat_sys_getdents(unsigned int fd,
996 struct compat_linux_dirent __user *dirent, unsigned int count)
997{
998 struct file * file;
999 struct compat_linux_dirent __user * lastdirent;
1000 struct compat_getdents_callback buf;
1001 int error;
1002
1003 error = -EFAULT;
1004 if (!access_ok(VERIFY_WRITE, dirent, count))
1005 goto out;
1006
1007 error = -EBADF;
1008 file = fget(fd);
1009 if (!file)
1010 goto out;
1011
1012 buf.current_dir = dirent;
1013 buf.previous = NULL;
1014 buf.count = count;
1015 buf.error = 0;
1016
1017 error = vfs_readdir(file, compat_filldir, &buf);
53c9c5c0
AV		 1018 if (error >= 0)
1019 error = buf.error;
1da177e4
LT		 1020 lastdirent = buf.previous;
1021 if (lastdirent) {
1022 if (put_user(file->f_pos, &lastdirent->d_off))
1023 error = -EFAULT;
1024 else
1025 error = count - buf.count;
1026 }
1da177e4
LT		 1027 fput(file);
1028out:
1029 return error;
1030}
1031
1032#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1da177e4
LT		 1033
1034struct compat_getdents_callback64 {
1035 struct linux_dirent64 __user *current_dir;
1036 struct linux_dirent64 __user *previous;
1037 int count;
1038 int error;
1039};
1040
1041static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
afefdbb2 1042 u64 ino, unsigned int d_type)
1da177e4
LT		 1043{
1044 struct linux_dirent64 __user *dirent;
1045 struct compat_getdents_callback64 *buf = __buf;
85c9fe8f
KW		 1046 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1047 sizeof(u64));
1da177e4
LT		 1048 u64 off;
1049
1050 buf->error = -EINVAL; /* only used if we fail.. */
1051 if (reclen > buf->count)
1052 return -EINVAL;
1053 dirent = buf->previous;
1054
1055 if (dirent) {
1056 if (__put_user_unaligned(offset, &dirent->d_off))
1057 goto efault;
1058 }
1059 dirent = buf->current_dir;
1060 if (__put_user_unaligned(ino, &dirent->d_ino))
1061 goto efault;
1062 off = 0;
1063 if (__put_user_unaligned(off, &dirent->d_off))
1064 goto efault;
1065 if (__put_user(reclen, &dirent->d_reclen))
1066 goto efault;
1067 if (__put_user(d_type, &dirent->d_type))
1068 goto efault;
1069 if (copy_to_user(dirent->d_name, name, namlen))
1070 goto efault;
1071 if (__put_user(0, dirent->d_name + namlen))
1072 goto efault;
1073 buf->previous = dirent;
1074 dirent = (void __user *)dirent + reclen;
1075 buf->current_dir = dirent;
1076 buf->count -= reclen;
1077 return 0;
1078efault:
1079 buf->error = -EFAULT;
1080 return -EFAULT;
1081}
1082
1083asmlinkage long compat_sys_getdents64(unsigned int fd,
1084 struct linux_dirent64 __user * dirent, unsigned int count)
1085{
1086 struct file * file;
1087 struct linux_dirent64 __user * lastdirent;
1088 struct compat_getdents_callback64 buf;
1089 int error;
1090
1091 error = -EFAULT;
1092 if (!access_ok(VERIFY_WRITE, dirent, count))
1093 goto out;
1094
1095 error = -EBADF;
1096 file = fget(fd);
1097 if (!file)
1098 goto out;
1099
1100 buf.current_dir = dirent;
1101 buf.previous = NULL;
1102 buf.count = count;
1103 buf.error = 0;
1104
1105 error = vfs_readdir(file, compat_filldir64, &buf);
53c9c5c0
AV		 1106 if (error >= 0)
1107 error = buf.error;
1da177e4
LT		 1108 lastdirent = buf.previous;
1109 if (lastdirent) {
1110 typeof(lastdirent->d_off) d_off = file->f_pos;
7116e994 1111 if (__put_user_unaligned(d_off, &lastdirent->d_off))
53c9c5c0
AV		 1112 error = -EFAULT;
1113 else
1114 error = count - buf.count;
1da177e4 1115 }
1da177e4
LT		 1116 fput(file);
1117out:
1118 return error;
1119}
1120#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1121
1122static ssize_t compat_do_readv_writev(int type, struct file *file,
1123 const struct compat_iovec __user *uvector,
1124 unsigned long nr_segs, loff_t *pos)
1125{
1da177e4
LT		 1126 compat_ssize_t tot_len;
1127 struct iovec iovstack[UIO_FASTIOV];
767b68e9 1128 struct iovec *iov = iovstack;
1da177e4 1129 ssize_t ret;
1da177e4
LT		 1130 io_fn_t fn;
1131 iov_fn_t fnv;
1132
1da177e4 1133 ret = -EINVAL;
1da177e4
LT		 1134 if (!file->f_op)
1135 goto out;
b8373363 1136
1da177e4
LT		 1137 ret = -EFAULT;
1138 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1139 goto out;
1140
b8373363
JM		 1141 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1142 UIO_FASTIOV, iovstack, &iov);
1da177e4
LT		 1143 if (tot_len == 0) {
1144 ret = 0;
1145 goto out;
1146 }
1147
1148 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1149 if (ret < 0)
1da177e4
LT		 1150 goto out;
1151
1152 fnv = NULL;
1153 if (type == READ) {
1154 fn = file->f_op->read;
ee0b3e67 1155 fnv = file->f_op->aio_read;
1da177e4
LT		 1156 } else {
1157 fn = (io_fn_t)file->f_op->write;
ee0b3e67 1158 fnv = file->f_op->aio_write;
1da177e4
LT		 1159 }
1160
ee0b3e67
BP		 1161 if (fnv)
1162 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1163 pos, fnv);
1164 else
1165 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1da177e4 1166
1da177e4
LT		 1167out:
1168 if (iov != iovstack)
1169 kfree(iov);
0eeca283 1170 if ((ret + (type == READ)) > 0) {
0eeca283 1171 if (type == READ)
2a12a9d7 1172 fsnotify_access(file);
0eeca283 1173 else
2a12a9d7 1174 fsnotify_modify(file);
0eeca283 1175 }
1da177e4
LT		 1176 return ret;
1177}
1178
dac12138
GH		 1179static size_t compat_readv(struct file *file,
1180 const struct compat_iovec __user *vec,
1181 unsigned long vlen, loff_t *pos)
1da177e4 1182{
1da177e4
LT		 1183 ssize_t ret = -EBADF;
1184
1da177e4
LT		 1185 if (!(file->f_mode & FMODE_READ))
1186 goto out;
1187
1188 ret = -EINVAL;
ee0b3e67 1189 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1da177e4
LT		 1190 goto out;
1191
dac12138 1192 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1da177e4
LT		 1193
1194out:
ca8a5bd2
GH		 1195 if (ret > 0)
1196 add_rchar(current, ret);
1197 inc_syscr(current);
dac12138
GH		 1198 return ret;
1199}
1200
1201asmlinkage ssize_t
1202compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1203 unsigned long vlen)
1204{
1205 struct file *file;
10c7db27 1206 int fput_needed;
dac12138
GH		 1207 ssize_t ret;
1208
10c7db27 1209 file = fget_light(fd, &fput_needed);
dac12138
GH		 1210 if (!file)
1211 return -EBADF;
1212 ret = compat_readv(file, vec, vlen, &file->f_pos);
10c7db27 1213 fput_light(file, fput_needed);
1da177e4
LT		 1214 return ret;
1215}
1216
f3554f4b
GH		 1217asmlinkage ssize_t
1218compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1219 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1220{
1221 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1222 struct file *file;
10c7db27 1223 int fput_needed;
f3554f4b
GH		 1224 ssize_t ret;
1225
1226 if (pos < 0)
1227 return -EINVAL;
10c7db27 1228 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1229 if (!file)
1230 return -EBADF;
586ce098
AV		 1231 ret = -ESPIPE;
1232 if (file->f_mode & FMODE_PREAD)
1233 ret = compat_readv(file, vec, vlen, &pos);
10c7db27 1234 fput_light(file, fput_needed);
f3554f4b
GH		 1235 return ret;
1236}
1237
6949a631
GH		 1238static size_t compat_writev(struct file *file,
1239 const struct compat_iovec __user *vec,
1240 unsigned long vlen, loff_t *pos)
1da177e4 1241{
1da177e4
LT		 1242 ssize_t ret = -EBADF;
1243
1da177e4
LT		 1244 if (!(file->f_mode & FMODE_WRITE))
1245 goto out;
1246
1247 ret = -EINVAL;
ee0b3e67 1248 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1da177e4
LT		 1249 goto out;
1250
6949a631 1251 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1da177e4
LT		 1252
1253out:
ca8a5bd2
GH		 1254 if (ret > 0)
1255 add_wchar(current, ret);
1256 inc_syscw(current);
6949a631
GH		 1257 return ret;
1258}
1259
1260asmlinkage ssize_t
1261compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1262 unsigned long vlen)
1263{
1264 struct file *file;
10c7db27 1265 int fput_needed;
6949a631
GH		 1266 ssize_t ret;
1267
10c7db27 1268 file = fget_light(fd, &fput_needed);
6949a631
GH		 1269 if (!file)
1270 return -EBADF;
1271 ret = compat_writev(file, vec, vlen, &file->f_pos);
10c7db27 1272 fput_light(file, fput_needed);
1da177e4
LT		 1273 return ret;
1274}
1275
f3554f4b
GH		 1276asmlinkage ssize_t
1277compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
601cc11d 1278 unsigned long vlen, u32 pos_low, u32 pos_high)
f3554f4b
GH		 1279{
1280 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1281 struct file *file;
10c7db27 1282 int fput_needed;
f3554f4b
GH		 1283 ssize_t ret;
1284
1285 if (pos < 0)
1286 return -EINVAL;
10c7db27 1287 file = fget_light(fd, &fput_needed);
f3554f4b
GH		 1288 if (!file)
1289 return -EBADF;
586ce098
AV		 1290 ret = -ESPIPE;
1291 if (file->f_mode & FMODE_PWRITE)
1292 ret = compat_writev(file, vec, vlen, &pos);
10c7db27 1293 fput_light(file, fput_needed);
f3554f4b
GH		 1294 return ret;
1295}
1296
d2610202
AK		 1297asmlinkage long
1298compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1299 unsigned int nr_segs, unsigned int flags)
1300{
1301 unsigned i;
90cbad65 1302 struct iovec __user *iov;
98232d50 1303 if (nr_segs > UIO_MAXIOV)
d2610202
AK		 1304 return -EINVAL;
1305 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1306 for (i = 0; i < nr_segs; i++) {
1307 struct compat_iovec v;
1308 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1309 get_user(v.iov_len, &iov32[i].iov_len) ||
1310 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1311 put_user(v.iov_len, &iov[i].iov_len))
1312 return -EFAULT;
1313 }
1314 return sys_vmsplice(fd, iov, nr_segs, flags);
1315}
1316
e922efc3
MS		 1317/*
1318 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1319 * O_LARGEFILE flag.
1320 */
1321asmlinkage long
1322compat_sys_open(const char __user *filename, int flags, int mode)
1323{
5590ff0d
UD		 1324 return do_sys_open(AT_FDCWD, filename, flags, mode);
1325}
1326
1327/*
1328 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1329 * O_LARGEFILE flag.
1330 */
1331asmlinkage long
9ad11ab4 1332compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
5590ff0d
UD		 1333{
1334 return do_sys_open(dfd, filename, flags, mode);
e922efc3
MS		 1335}
1336
1da177e4
LT		 1337/*
1338 * compat_count() counts the number of arguments/envelopes. It is basically
1339 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1340 * and envp pointers.
1341 */
1342static int compat_count(compat_uptr_t __user *argv, int max)
1343{
1344 int i = 0;
1345
1346 if (argv != NULL) {
1347 for (;;) {
1348 compat_uptr_t p;
1349
1350 if (get_user(p, argv))
1351 return -EFAULT;
1352 if (!p)
1353 break;
1354 argv++;
362e6663 1355 if (i++ >= max)
1da177e4 1356 return -E2BIG;
114279be
ON		 1357
1358 if (fatal_signal_pending(current))
1359 return -ERESTARTNOHAND;
1360 cond_resched();
1da177e4
LT		 1361 }
1362 }
1363 return i;
1364}
1365
1366/*
1367 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1368 * except that it works with 32 bit argv and envp pointers.
1369 */
1370static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1371 struct linux_binprm *bprm)
1372{
1373 struct page *kmapped_page = NULL;
1374 char *kaddr = NULL;
b6a2fea3 1375 unsigned long kpos = 0;
1da177e4
LT		 1376 int ret;
1377
1378 while (argc-- > 0) {
1379 compat_uptr_t str;
1380 int len;
1381 unsigned long pos;
1382
1383 if (get_user(str, argv+argc) ||
b6a2fea3 1384 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1da177e4
LT		 1385 ret = -EFAULT;
1386 goto out;
1387 }
1388
b6a2fea3 1389 if (len > MAX_ARG_STRLEN) {
1da177e4
LT		 1390 ret = -E2BIG;
1391 goto out;
1392 }
1393
b6a2fea3 1394 /* We're going to work our way backwords. */
1da177e4 1395 pos = bprm->p;
b6a2fea3
OW		 1396 str += len;
1397 bprm->p -= len;
1da177e4
LT		 1398
1399 while (len > 0) {
1da177e4 1400 int offset, bytes_to_copy;
1da177e4 1401
114279be
ON		 1402 if (fatal_signal_pending(current)) {
1403 ret = -ERESTARTNOHAND;
1404 goto out;
1405 }
1406 cond_resched();
1407
1da177e4 1408 offset = pos % PAGE_SIZE;
b6a2fea3
OW		 1409 if (offset == 0)
1410 offset = PAGE_SIZE;
1411
1412 bytes_to_copy = offset;
1413 if (bytes_to_copy > len)
1414 bytes_to_copy = len;
1415
1416 offset -= bytes_to_copy;
1417 pos -= bytes_to_copy;
1418 str -= bytes_to_copy;
1419 len -= bytes_to_copy;
1420
1421 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1422 struct page *page;
1423
114279be
ON		 1424 page = get_arg_page(bprm, pos, 1);
1425 if (!page) {
b6a2fea3 1426 ret = -E2BIG;
1da177e4
LT		 1427 goto out;
1428 }
1da177e4 1429
b6a2fea3
OW		 1430 if (kmapped_page) {
1431 flush_kernel_dcache_page(kmapped_page);
1da177e4 1432 kunmap(kmapped_page);
b6a2fea3
OW		 1433 put_page(kmapped_page);
1434 }
1da177e4
LT		 1435 kmapped_page = page;
1436 kaddr = kmap(kmapped_page);
b6a2fea3
OW		 1437 kpos = pos & PAGE_MASK;
1438 flush_cache_page(bprm->vma, kpos,
1439 page_to_pfn(kmapped_page));
1da177e4 1440 }
b6a2fea3
OW		 1441 if (copy_from_user(kaddr+offset, compat_ptr(str),
1442 bytes_to_copy)) {
1da177e4
LT		 1443 ret = -EFAULT;
1444 goto out;
1445 }
1da177e4
LT		 1446 }
1447 }
1448 ret = 0;
1449out:
b6a2fea3
OW		 1450 if (kmapped_page) {
1451 flush_kernel_dcache_page(kmapped_page);
1da177e4 1452 kunmap(kmapped_page);
b6a2fea3 1453 put_page(kmapped_page);
1da177e4 1454 }
b6a2fea3 1455 return ret;
1da177e4
LT		 1456}
1457
1da177e4
LT		 1458/*
1459 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1460 * that it processes 32 bit argv and envp pointers.
1461 */
1462int compat_do_execve(char * filename,
1463 compat_uptr_t __user *argv,
1464 compat_uptr_t __user *envp,
1465 struct pt_regs * regs)
1466{
1467 struct linux_binprm *bprm;
1468 struct file *file;
53e9309e 1469 struct files_struct *displaced;
8c652f96 1470 bool clear_in_exec;
1da177e4 1471 int retval;
1da177e4 1472
53e9309e
HD		 1473 retval = unshare_files(&displaced);
1474 if (retval)
1475 goto out_ret;
1476
1da177e4 1477 retval = -ENOMEM;
11b0b5ab 1478 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1da177e4 1479 if (!bprm)
53e9309e 1480 goto out_files;
1da177e4 1481
a2a8474c
ON		 1482 retval = prepare_bprm_creds(bprm);
1483 if (retval)
a6f76f23 1484 goto out_free;
498052bb
AV		 1485
1486 retval = check_unsafe_exec(bprm);
8c652f96 1487 if (retval < 0)
a2a8474c 1488 goto out_free;
8c652f96 1489 clear_in_exec = retval;
a2a8474c 1490 current->in_execve = 1;
a6f76f23 1491
1da177e4
LT		 1492 file = open_exec(filename);
1493 retval = PTR_ERR(file);
1494 if (IS_ERR(file))
498052bb 1495 goto out_unmark;
1da177e4
LT		 1496
1497 sched_exec();
1498
1da177e4
LT		 1499 bprm->file = file;
1500 bprm->filename = filename;
1501 bprm->interp = filename;
1da177e4 1502
b6a2fea3
OW		 1503 retval = bprm_mm_init(bprm);
1504 if (retval)
1505 goto out_file;
1da177e4 1506
b6a2fea3 1507 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1da177e4 1508 if ((retval = bprm->argc) < 0)
a6f76f23 1509 goto out;
1da177e4 1510
b6a2fea3 1511 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1da177e4 1512 if ((retval = bprm->envc) < 0)
1da177e4
LT		 1513 goto out;
1514
1515 retval = prepare_binprm(bprm);
1516 if (retval < 0)
1517 goto out;
1518
1519 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1520 if (retval < 0)
1521 goto out;
1522
1523 bprm->exec = bprm->p;
1524 retval = compat_copy_strings(bprm->envc, envp, bprm);
1525 if (retval < 0)
1526 goto out;
1527
1528 retval = compat_copy_strings(bprm->argc, argv, bprm);
1529 if (retval < 0)
1530 goto out;
1531
1532 retval = search_binary_handler(bprm, regs);
a6f76f23
DH		 1533 if (retval < 0)
1534 goto out;
1da177e4 1535
a6f76f23 1536 /* execve succeeded */
498052bb 1537 current->fs->in_exec = 0;
f9ce1f1c 1538 current->in_execve = 0;
a6f76f23
DH		 1539 acct_update_integrals(current);
1540 free_bprm(bprm);
53e9309e
HD		 1541 if (displaced)
1542 put_files_struct(displaced);
a6f76f23 1543 return retval;
1da177e4 1544
a6f76f23 1545out:
114279be
ON		 1546 if (bprm->mm) {
1547 acct_arg_size(bprm, 0);
b6a2fea3 1548 mmput(bprm->mm);
114279be 1549 }
1da177e4
LT		 1550
1551out_file:
1552 if (bprm->file) {
1553 allow_write_access(bprm->file);
1554 fput(bprm->file);
1555 }
1556
498052bb 1557out_unmark:
8c652f96
ON		 1558 if (clear_in_exec)
1559 current->fs->in_exec = 0;
f9ce1f1c 1560 current->in_execve = 0;
a6f76f23
DH		 1561
1562out_free:
08a6fac1 1563 free_bprm(bprm);
1da177e4 1564
53e9309e
HD		 1565out_files:
1566 if (displaced)
1567 reset_files_struct(displaced);
1da177e4
LT		 1568out_ret:
1569 return retval;
1570}
1571
1572#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1573
b773ad40
TG		 1574static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1575 int timeval, int ret)
1576{
1577 struct timespec ts;
1578
1579 if (!p)
1580 return ret;
1581
1582 if (current->personality & STICKY_TIMEOUTS)
1583 goto sticky;
1584
1585 /* No update for zero timeout */
1586 if (!end_time->tv_sec && !end_time->tv_nsec)
1587 return ret;
1588
1589 ktime_get_ts(&ts);
1590 ts = timespec_sub(*end_time, ts);
1591 if (ts.tv_sec < 0)
1592 ts.tv_sec = ts.tv_nsec = 0;
1593
1594 if (timeval) {
1595 struct compat_timeval rtv;
1596
1597 rtv.tv_sec = ts.tv_sec;
1598 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1599
1600 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1601 return ret;
1602 } else {
1603 struct compat_timespec rts;
1604
1605 rts.tv_sec = ts.tv_sec;
1606 rts.tv_nsec = ts.tv_nsec;
1607
1608 if (!copy_to_user(p, &rts, sizeof(rts)))
1609 return ret;
1610 }
1611 /*
1612 * If an application puts its timeval in read-only memory, we
1613 * don't want the Linux-specific update to the timeval to
1614 * cause a fault after the select has completed
1615 * successfully. However, because we're not updating the
1616 * timeval, we can't restart the system call.
1617 */
1618
1619sticky:
1620 if (ret == -ERESTARTNOHAND)
1621 ret = -EINTR;
1622 return ret;
1623}
1624
1da177e4
LT		 1625/*
1626 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1627 * 64-bit unsigned longs.
1628 */
858119e1 1629static
1da177e4
LT		 1630int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1631 unsigned long *fdset)
1632{
022a1692 1633 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1634 if (ufdset) {
1635 unsigned long odd;
1636
1637 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1638 return -EFAULT;
1639
1640 odd = nr & 1UL;
1641 nr &= ~1UL;
1642 while (nr) {
1643 unsigned long h, l;
7116e994
HC		 1644 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1645 return -EFAULT;
1da177e4
LT		 1646 ufdset += 2;
1647 *fdset++ = h << 32 | l;
1648 nr -= 2;
1649 }
7116e994
HC		 1650 if (odd && __get_user(*fdset, ufdset))
1651 return -EFAULT;
1da177e4
LT		 1652 } else {
1653 /* Tricky, must clear full unsigned long in the
1654 * kernel fdset at the end, this makes sure that
1655 * actually happens.
1656 */
1657 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1658 }
1659 return 0;
1660}
1661
858119e1 1662static
7116e994
HC		 1663int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1664 unsigned long *fdset)
1da177e4
LT		 1665{
1666 unsigned long odd;
022a1692 1667 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1da177e4
LT		 1668
1669 if (!ufdset)
7116e994 1670 return 0;
1da177e4
LT		 1671
1672 odd = nr & 1UL;
1673 nr &= ~1UL;
1674 while (nr) {
1675 unsigned long h, l;
1676 l = *fdset++;
1677 h = l >> 32;
7116e994
HC		 1678 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1679 return -EFAULT;
1da177e4
LT		 1680 ufdset += 2;
1681 nr -= 2;
1682 }
7116e994
HC		 1683 if (odd && __put_user(*fdset, ufdset))
1684 return -EFAULT;
1685 return 0;
1da177e4
LT		 1686}
1687
1688
1689/*
1690 * This is a virtual copy of sys_select from fs/select.c and probably
1691 * should be compared to it from time to time
1692 */
1da177e4
LT		 1693
1694/*
1695 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1696 * like to be certain this leads to no problems. So I return
1697 * EINTR just for safety.
1698 *
1699 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1700 * I'm trying ERESTARTNOHAND which restart only when you want to.
1701 */
1702#define MAX_SELECT_SECONDS \
1703 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1704
9f72949f 1705int compat_core_sys_select(int n, compat_ulong_t __user *inp,
8ff3e8e8
AV		 1706 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1707 struct timespec *end_time)
1da177e4
LT		 1708{
1709 fd_set_bits fds;
6087b2da 1710 void *bits;
bbea9f69 1711 int size, max_fds, ret = -EINVAL;
a4531edd 1712 struct fdtable *fdt;
6087b2da 1713 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1da177e4 1714
1da177e4
LT		 1715 if (n < 0)
1716 goto out_nofds;
1717
bbea9f69 1718 /* max_fds can increase, so grab it once to avoid race */
ac5b8b6f 1719 rcu_read_lock();
a4531edd 1720 fdt = files_fdtable(current->files);
bbea9f69 1721 max_fds = fdt->max_fds;
ac5b8b6f 1722 rcu_read_unlock();
bbea9f69
VL		 1723 if (n > max_fds)
1724 n = max_fds;
1da177e4
LT		 1725
1726 /*
1727 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1728 * since we used fdset we need to allocate memory in units of
1729 * long-words.
1730 */
1da177e4 1731 size = FDS_BYTES(n);
6087b2da
BP		 1732 bits = stack_fds;
1733 if (size > sizeof(stack_fds) / 6) {
1734 bits = kmalloc(6 * size, GFP_KERNEL);
1735 ret = -ENOMEM;
1736 if (!bits)
1737 goto out_nofds;
1738 }
1da177e4
LT		 1739 fds.in = (unsigned long *) bits;
1740 fds.out = (unsigned long *) (bits + size);
1741 fds.ex = (unsigned long *) (bits + 2*size);
1742 fds.res_in = (unsigned long *) (bits + 3*size);
1743 fds.res_out = (unsigned long *) (bits + 4*size);
1744 fds.res_ex = (unsigned long *) (bits + 5*size);
1745
1746 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1747 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1748 (ret = compat_get_fd_set(n, exp, fds.ex)))
1749 goto out;
1750 zero_fd_set(n, fds.res_in);
1751 zero_fd_set(n, fds.res_out);
1752 zero_fd_set(n, fds.res_ex);
1753
8ff3e8e8 1754 ret = do_select(n, &fds, end_time);
1da177e4
LT		 1755
1756 if (ret < 0)
1757 goto out;
1758 if (!ret) {
1759 ret = -ERESTARTNOHAND;
1760 if (signal_pending(current))
1761 goto out;
1762 ret = 0;
1763 }
1764
7116e994
HC		 1765 if (compat_set_fd_set(n, inp, fds.res_in) ||
1766 compat_set_fd_set(n, outp, fds.res_out) ||
1767 compat_set_fd_set(n, exp, fds.res_ex))
1768 ret = -EFAULT;
1da177e4 1769out:
6087b2da
BP		 1770 if (bits != stack_fds)
1771 kfree(bits);
1da177e4
LT		 1772out_nofds:
1773 return ret;
1774}
1775
9f72949f
DW		 1776asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1777 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1778 struct compat_timeval __user *tvp)
1779{
8ff3e8e8 1780 struct timespec end_time, *to = NULL;
9f72949f
DW		 1781 struct compat_timeval tv;
1782 int ret;
1783
1784 if (tvp) {
1785 if (copy_from_user(&tv, tvp, sizeof(tv)))
1786 return -EFAULT;
1787
8ff3e8e8 1788 to = &end_time;
4d36a9e6
AV		 1789 if (poll_select_set_timeout(to,
1790 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1791 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
9f72949f 1792 return -EINVAL;
9f72949f
DW		 1793 }
1794
8ff3e8e8
AV		 1795 ret = compat_core_sys_select(n, inp, outp, exp, to);
1796 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
9f72949f
DW		 1797
1798 return ret;
1799}
1800
5d0e5283
CH		 1801struct compat_sel_arg_struct {
1802 compat_ulong_t n;
1803 compat_uptr_t inp;
1804 compat_uptr_t outp;
1805 compat_uptr_t exp;
1806 compat_uptr_t tvp;
1807};
1808
1809asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1810{
1811 struct compat_sel_arg_struct a;
1812
1813 if (copy_from_user(&a, arg, sizeof(a)))
1814 return -EFAULT;
1815 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1816 compat_ptr(a.exp), compat_ptr(a.tvp));
1817}
1818
f3de272b 1819#ifdef HAVE_SET_RESTORE_SIGMASK
c9da9f21 1820static long do_compat_pselect(int n, compat_ulong_t __user *inp,
9f72949f
DW		 1821 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1822 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1823 compat_size_t sigsetsize)
1824{
1825 compat_sigset_t ss32;
1826 sigset_t ksigmask, sigsaved;
9f72949f 1827 struct compat_timespec ts;
8ff3e8e8 1828 struct timespec end_time, *to = NULL;
9f72949f
DW		 1829 int ret;
1830
1831 if (tsp) {
1832 if (copy_from_user(&ts, tsp, sizeof(ts)))
1833 return -EFAULT;
1834
8ff3e8e8
AV		 1835 to = &end_time;
1836 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
9f72949f
DW		 1837 return -EINVAL;
1838 }
1839
1840 if (sigmask) {
1841 if (sigsetsize != sizeof(compat_sigset_t))
1842 return -EINVAL;
1843 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1844 return -EFAULT;
1845 sigset_from_compat(&ksigmask, &ss32);
1846
1847 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1848 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1849 }
1850
8ff3e8e8
AV		 1851 ret = compat_core_sys_select(n, inp, outp, exp, to);
1852 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1853
1854 if (ret == -ERESTARTNOHAND) {
1855 /*
1856 * Don't restore the signal mask yet. Let do_signal() deliver
1857 * the signal on the way back to userspace, before the signal
1858 * mask is restored.
1859 */
1860 if (sigmask) {
1861 memcpy(&current->saved_sigmask, &sigsaved,
1862 sizeof(sigsaved));
4e4c22c7 1863 set_restore_sigmask();
9f72949f
DW		 1864 }
1865 } else if (sigmask)
1866 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1867
1868 return ret;
1869}
1870
1871asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1872 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1873 struct compat_timespec __user *tsp, void __user *sig)
1874{
1875 compat_size_t sigsetsize = 0;
1876 compat_uptr_t up = 0;
1877
1878 if (sig) {
1879 if (!access_ok(VERIFY_READ, sig,
1880 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1881 __get_user(up, (compat_uptr_t __user *)sig) ||
1882 __get_user(sigsetsize,
1883 (compat_size_t __user *)(sig+sizeof(up))))
1884 return -EFAULT;
1885 }
c9da9f21
HC		 1886 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1887 sigsetsize);
9f72949f
DW		 1888}
1889
1890asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1891 unsigned int nfds, struct compat_timespec __user *tsp,
1892 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1893{
1894 compat_sigset_t ss32;
1895 sigset_t ksigmask, sigsaved;
1896 struct compat_timespec ts;
8ff3e8e8 1897 struct timespec end_time, *to = NULL;
9f72949f
DW		 1898 int ret;
1899
1900 if (tsp) {
1901 if (copy_from_user(&ts, tsp, sizeof(ts)))
1902 return -EFAULT;
1903
8ff3e8e8
AV		 1904 to = &end_time;
1905 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1906 return -EINVAL;
9f72949f
DW		 1907 }
1908
1909 if (sigmask) {
3835a9bd 1910 if (sigsetsize != sizeof(compat_sigset_t))
9f72949f
DW		 1911 return -EINVAL;
1912 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1913 return -EFAULT;
1914 sigset_from_compat(&ksigmask, &ss32);
1915
1916 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1917 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1918 }
1919
8ff3e8e8 1920 ret = do_sys_poll(ufds, nfds, to);
9f72949f
DW		 1921
1922 /* We can restart this syscall, usually */
1923 if (ret == -EINTR) {
1924 /*
1925 * Don't restore the signal mask yet. Let do_signal() deliver
1926 * the signal on the way back to userspace, before the signal
1927 * mask is restored.
1928 */
1929 if (sigmask) {
1930 memcpy(&current->saved_sigmask, &sigsaved,
1931 sizeof(sigsaved));
4e4c22c7 1932 set_restore_sigmask();
9f72949f
DW		 1933 }
1934 ret = -ERESTARTNOHAND;
1935 } else if (sigmask)
1936 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1937
8ff3e8e8 1938 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
9f72949f
DW		 1939
1940 return ret;
1941}
f3de272b 1942#endif /* HAVE_SET_RESTORE_SIGMASK */
9f72949f 1943
1e140567 1944#if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
1da177e4
LT		 1945/* Stuff for NFS server syscalls... */
1946struct compat_nfsctl_svc {
1947 u16 svc32_port;
1948 s32 svc32_nthreads;
1949};
1950
1951struct compat_nfsctl_client {
1952 s8 cl32_ident[NFSCLNT_IDMAX+1];
1953 s32 cl32_naddr;
1954 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1955 s32 cl32_fhkeytype;
1956 s32 cl32_fhkeylen;
1957 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1958};
1959
1960struct compat_nfsctl_export {
1961 char ex32_client[NFSCLNT_IDMAX+1];
1962 char ex32_path[NFS_MAXPATHLEN+1];
1963 compat_dev_t ex32_dev;
1964 compat_ino_t ex32_ino;
1965 compat_int_t ex32_flags;
202e5979
SR		 1966 __compat_uid_t ex32_anon_uid;
1967 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1968};
1969
1970struct compat_nfsctl_fdparm {
1971 struct sockaddr gd32_addr;
1972 s8 gd32_path[NFS_MAXPATHLEN+1];
1973 compat_int_t gd32_version;
1974};
1975
1976struct compat_nfsctl_fsparm {
1977 struct sockaddr gd32_addr;
1978 s8 gd32_path[NFS_MAXPATHLEN+1];
1979 compat_int_t gd32_maxlen;
1980};
1981
1982struct compat_nfsctl_arg {
1983 compat_int_t ca32_version; /* safeguard */
1984 union {
1985 struct compat_nfsctl_svc u32_svc;
1986 struct compat_nfsctl_client u32_client;
1987 struct compat_nfsctl_export u32_export;
1988 struct compat_nfsctl_fdparm u32_getfd;
1989 struct compat_nfsctl_fsparm u32_getfs;
1990 } u;
1991#define ca32_svc u.u32_svc
1992#define ca32_client u.u32_client
1993#define ca32_export u.u32_export
1994#define ca32_getfd u.u32_getfd
1995#define ca32_getfs u.u32_getfs
1996};
1997
1998union compat_nfsctl_res {
1999 __u8 cr32_getfh[NFS_FHSIZE];
2000 struct knfsd_fh cr32_getfs;
2001};
2002
d64b1c87
LFS		 2003static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2004 struct compat_nfsctl_arg __user *arg)
1da177e4 2005{
d64b1c87
LFS		 2006 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2007 get_user(karg->ca_version, &arg->ca32_version) ||
2008 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2009 __get_user(karg->ca_svc.svc_nthreads,
2010 &arg->ca32_svc.svc32_nthreads))
2011 return -EFAULT;
2012 return 0;
1da177e4
LT		 2013}
2014
d64b1c87
LFS		 2015static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2016 struct compat_nfsctl_arg __user *arg)
1da177e4 2017{
d64b1c87
LFS		 2018 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2019 sizeof(arg->ca32_client)) ||
2020 get_user(karg->ca_version, &arg->ca32_version) ||
2021 __copy_from_user(&karg->ca_client.cl_ident[0],
2022 &arg->ca32_client.cl32_ident[0],
2023 NFSCLNT_IDMAX) ||
2024 __get_user(karg->ca_client.cl_naddr,
2025 &arg->ca32_client.cl32_naddr) ||
2026 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2027 &arg->ca32_client.cl32_addrlist[0],
2028 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2029 __get_user(karg->ca_client.cl_fhkeytype,
2030 &arg->ca32_client.cl32_fhkeytype) ||
2031 __get_user(karg->ca_client.cl_fhkeylen,
2032 &arg->ca32_client.cl32_fhkeylen) ||
2033 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2034 &arg->ca32_client.cl32_fhkey[0],
2035 NFSCLNT_KEYMAX))
2036 return -EFAULT;
1da177e4 2037
d64b1c87 2038 return 0;
1da177e4
LT		 2039}
2040
d64b1c87
LFS		 2041static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2042 struct compat_nfsctl_arg __user *arg)
1da177e4 2043{
d64b1c87
LFS		 2044 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2045 sizeof(arg->ca32_export)) ||
2046 get_user(karg->ca_version, &arg->ca32_version) ||
2047 __copy_from_user(&karg->ca_export.ex_client[0],
2048 &arg->ca32_export.ex32_client[0],
2049 NFSCLNT_IDMAX) ||
2050 __copy_from_user(&karg->ca_export.ex_path[0],
2051 &arg->ca32_export.ex32_path[0],
2052 NFS_MAXPATHLEN) ||
2053 __get_user(karg->ca_export.ex_dev,
2054 &arg->ca32_export.ex32_dev) ||
2055 __get_user(karg->ca_export.ex_ino,
2056 &arg->ca32_export.ex32_ino) ||
2057 __get_user(karg->ca_export.ex_flags,
2058 &arg->ca32_export.ex32_flags) ||
2059 __get_user(karg->ca_export.ex_anon_uid,
2060 &arg->ca32_export.ex32_anon_uid) ||
2061 __get_user(karg->ca_export.ex_anon_gid,
2062 &arg->ca32_export.ex32_anon_gid))
2063 return -EFAULT;
1da177e4
LT		 2064 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2065 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2066
d64b1c87 2067 return 0;
1da177e4
LT		 2068}
2069
d64b1c87
LFS		 2070static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2071 struct compat_nfsctl_arg __user *arg)
1da177e4 2072{
d64b1c87
LFS		 2073 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2074 sizeof(arg->ca32_getfd)) ||
2075 get_user(karg->ca_version, &arg->ca32_version) ||
2076 __copy_from_user(&karg->ca_getfd.gd_addr,
2077 &arg->ca32_getfd.gd32_addr,
2078 (sizeof(struct sockaddr))) ||
2079 __copy_from_user(&karg->ca_getfd.gd_path,
2080 &arg->ca32_getfd.gd32_path,
2081 (NFS_MAXPATHLEN+1)) ||
2082 __get_user(karg->ca_getfd.gd_version,
2083 &arg->ca32_getfd.gd32_version))
2084 return -EFAULT;
1da177e4 2085
d64b1c87 2086 return 0;
1da177e4
LT		 2087}
2088
d64b1c87
LFS		 2089static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2090 struct compat_nfsctl_arg __user *arg)
1da177e4 2091{
d64b1c87
LFS		 2092 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2093 get_user(karg->ca_version, &arg->ca32_version) ||
2094 __copy_from_user(&karg->ca_getfs.gd_addr,
2095 &arg->ca32_getfs.gd32_addr,
2096 (sizeof(struct sockaddr))) ||
2097 __copy_from_user(&karg->ca_getfs.gd_path,
2098 &arg->ca32_getfs.gd32_path,
2099 (NFS_MAXPATHLEN+1)) ||
2100 __get_user(karg->ca_getfs.gd_maxlen,
2101 &arg->ca32_getfs.gd32_maxlen))
2102 return -EFAULT;
1da177e4 2103
d64b1c87 2104 return 0;
1da177e4
LT		 2105}
2106
2107/* This really doesn't need translations, we are only passing
2108 * back a union which contains opaque nfs file handle data.
2109 */
d64b1c87
LFS		 2110static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2111 union compat_nfsctl_res __user *res)
1da177e4
LT		 2112{
2113 int err;
2114
2115 err = copy_to_user(res, kres, sizeof(*res));
2116
2117 return (err) ? -EFAULT : 0;
2118}
2119
d64b1c87
LFS		 2120asmlinkage long compat_sys_nfsservctl(int cmd,
2121 struct compat_nfsctl_arg __user *arg,
2122 union compat_nfsctl_res __user *res)
1da177e4
LT		 2123{
2124 struct nfsctl_arg *karg;
2125 union nfsctl_res *kres;
2126 mm_segment_t oldfs;
2127 int err;
2128
2129 karg = kmalloc(sizeof(*karg), GFP_USER);
2130 kres = kmalloc(sizeof(*kres), GFP_USER);
2131 if(!karg || !kres) {
2132 err = -ENOMEM;
2133 goto done;
2134 }
2135
2136 switch(cmd) {
2137 case NFSCTL_SVC:
2138 err = compat_nfs_svc_trans(karg, arg);
2139 break;
2140
2141 case NFSCTL_ADDCLIENT:
2142 err = compat_nfs_clnt_trans(karg, arg);
2143 break;
2144
2145 case NFSCTL_DELCLIENT:
2146 err = compat_nfs_clnt_trans(karg, arg);
2147 break;
2148
2149 case NFSCTL_EXPORT:
2150 case NFSCTL_UNEXPORT:
2151 err = compat_nfs_exp_trans(karg, arg);
2152 break;
2153
2154 case NFSCTL_GETFD:
2155 err = compat_nfs_getfd_trans(karg, arg);
2156 break;
2157
2158 case NFSCTL_GETFS:
2159 err = compat_nfs_getfs_trans(karg, arg);
2160 break;
2161
2162 default:
2163 err = -EINVAL;
57070d01 2164 break;
1da177e4
LT		 2165 }
2166
57070d01
PS		 2167 if (err)
2168 goto done;
2169
1da177e4
LT		 2170 oldfs = get_fs();
2171 set_fs(KERNEL_DS);
2172 /* The __user pointer casts are valid because of the set_fs() */
2173 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2174 set_fs(oldfs);
2175
2176 if (err)
2177 goto done;
2178
2179 if((cmd == NFSCTL_GETFD) ||
2180 (cmd == NFSCTL_GETFS))
2181 err = compat_nfs_getfh_res_trans(kres, res);
2182
2183done:
2184 kfree(karg);
2185 kfree(kres);
2186 return err;
2187}
2188#else /* !NFSD */
2189long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2190{
2191 return sys_ni_syscall();
2192}
2193#endif
f6dfb4fd
DL		 2194
2195#ifdef CONFIG_EPOLL
2196
f3de272b 2197#ifdef HAVE_SET_RESTORE_SIGMASK
f6dfb4fd
DL		 2198asmlinkage long compat_sys_epoll_pwait(int epfd,
2199 struct compat_epoll_event __user *events,
2200 int maxevents, int timeout,
2201 const compat_sigset_t __user *sigmask,
2202 compat_size_t sigsetsize)
2203{
2204 long err;
2205 compat_sigset_t csigmask;
2206 sigset_t ksigmask, sigsaved;
2207
2208 /*
2209 * If the caller wants a certain signal mask to be set during the wait,
2210 * we apply it here.
2211 */
2212 if (sigmask) {
2213 if (sigsetsize != sizeof(compat_sigset_t))
2214 return -EINVAL;
2215 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2216 return -EFAULT;
2217 sigset_from_compat(&ksigmask, &csigmask);
2218 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2219 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2220 }
2221
f6dfb4fd 2222 err = sys_epoll_wait(epfd, events, maxevents, timeout);
f6dfb4fd
DL		 2223
2224 /*
2225 * If we changed the signal mask, we need to restore the original one.
2226 * In case we've got a signal while waiting, we do not restore the
2227 * signal mask yet, and we allow do_signal() to deliver the signal on
2228 * the way back to userspace, before the signal mask is restored.
2229 */
2230 if (sigmask) {
2231 if (err == -EINTR) {
2232 memcpy(&current->saved_sigmask, &sigsaved,
2233 sizeof(sigsaved));
4e4c22c7 2234 set_restore_sigmask();
f6dfb4fd
DL		 2235 } else
2236 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2237 }
2238
2239 return err;
2240}
f3de272b 2241#endif /* HAVE_SET_RESTORE_SIGMASK */
f6dfb4fd
DL		 2242
2243#endif /* CONFIG_EPOLL */
6d18c922
DL		 2244
2245#ifdef CONFIG_SIGNALFD
2246
9deb27ba
UD		 2247asmlinkage long compat_sys_signalfd4(int ufd,
2248 const compat_sigset_t __user *sigmask,
2249 compat_size_t sigsetsize, int flags)
6d18c922
DL		 2250{
2251 compat_sigset_t ss32;
2252 sigset_t tmp;
2253 sigset_t __user *ksigmask;
2254
2255 if (sigsetsize != sizeof(compat_sigset_t))
2256 return -EINVAL;
2257 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2258 return -EFAULT;
2259 sigset_from_compat(&tmp, &ss32);
2260 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2261 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2262 return -EFAULT;
2263
9deb27ba 2264 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
6d18c922
DL		 2265}
2266
9deb27ba
UD		 2267asmlinkage long compat_sys_signalfd(int ufd,
2268 const compat_sigset_t __user *sigmask,
2269 compat_size_t sigsetsize)
2270{
2271 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2272}
6d18c922
DL		 2273#endif /* CONFIG_SIGNALFD */
2274
83f5d126
DL		 2275#ifdef CONFIG_TIMERFD
2276
4d672e7a
DL		 2277asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2278 const struct compat_itimerspec __user *utmr,
2279 struct compat_itimerspec __user *otmr)
83f5d126 2280{
4d672e7a 2281 int error;
83f5d126
DL		 2282 struct itimerspec t;
2283 struct itimerspec __user *ut;
2284
83f5d126 2285 if (get_compat_itimerspec(&t, utmr))
8317f14b 2286 return -EFAULT;
4d672e7a
DL		 2287 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2288 if (copy_to_user(&ut[0], &t, sizeof(t)))
8317f14b 2289 return -EFAULT;
4d672e7a
DL		 2290 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2291 if (!error && otmr)
2292 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2293 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2294
2295 return error;
2296}
2297
2298asmlinkage long compat_sys_timerfd_gettime(int ufd,
2299 struct compat_itimerspec __user *otmr)
2300{
2301 int error;
2302 struct itimerspec t;
2303 struct itimerspec __user *ut;
83f5d126 2304
4d672e7a
DL		 2305 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2306 error = sys_timerfd_gettime(ufd, ut);
2307 if (!error)
2308 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2309 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2310
2311 return error;
83f5d126
DL		 2312}
2313
2314#endif /* CONFIG_TIMERFD */
Linux 6.x block layer and io_uring tree(s)