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mm: compaction: prevent kswapd compacting memory to reduce CPU usage
[linux/fpc-iii.git] / fs / compat.c
blob72fe6cda9108a162177e91093514a68854323f5a
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@ucw.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
18 #include <linux/stddef.h>
19 #include <linux/kernel.h>
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>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/syscalls.h>
35 #include <linux/ctype.h>
36 #include <linux/module.h>
37 #include <linux/dirent.h>
38 #include <linux/fsnotify.h>
39 #include <linux/highuid.h>
40 #include <linux/nfsd/syscall.h>
41 #include <linux/personality.h>
42 #include <linux/rwsem.h>
43 #include <linux/tsacct_kern.h>
44 #include <linux/security.h>
45 #include <linux/highmem.h>
46 #include <linux/signal.h>
47 #include <linux/poll.h>
48 #include <linux/mm.h>
49 #include <linux/eventpoll.h>
50 #include <linux/fs_struct.h>
51 #include <linux/slab.h>
52 #include <linux/pagemap.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ioctls.h>
57 #include "internal.h"
58
59 int compat_log = 1;
60
61 int 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
73 #include "read_write.h"
74
75 /*
76 * Not all architectures have sys_utime, so implement this in terms
77 * of sys_utimes.
78 */
79 asmlinkage long compat_sys_utime(const char __user *filename,
80 struct compat_utimbuf __user *t)
81 {
82 struct timespec tv[2];
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;
88 tv[0].tv_nsec = 0;
89 tv[1].tv_nsec = 0;
90 }
91 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
92 }
93
94 asmlinkage long compat_sys_utimensat(unsigned int dfd, const 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[1].tv_nsec == UTIME_OMIT)
104 return 0;
105 }
106 return do_utimes(dfd, filename, t ? tv : NULL, flags);
107 }
108
109 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
110 {
111 struct timespec tv[2];
112
113 if (t) {
114 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
115 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
116 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
117 get_user(tv[1].tv_nsec, &t[1].tv_usec))
118 return -EFAULT;
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;
124 }
125 return do_utimes(dfd, filename, t ? tv : NULL, 0);
126 }
127
128 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
129 {
130 return compat_sys_futimesat(AT_FDCWD, filename, t);
131 }
132
133 static 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
172 asmlinkage long compat_sys_newstat(const char __user * filename,
173 struct compat_stat __user *statbuf)
174 {
175 struct kstat stat;
176 int error;
177
178 error = vfs_stat(filename, &stat);
179 if (error)
180 return error;
181 return cp_compat_stat(&stat, statbuf);
182 }
183
184 asmlinkage long compat_sys_newlstat(const char __user * filename,
185 struct compat_stat __user *statbuf)
186 {
187 struct kstat stat;
188 int error;
189
190 error = vfs_lstat(filename, &stat);
191 if (error)
192 return error;
193 return cp_compat_stat(&stat, statbuf);
194 }
195
196 #ifndef __ARCH_WANT_STAT64
197 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
198 const char __user *filename,
199 struct compat_stat __user *statbuf, int flag)
200 {
201 struct kstat stat;
202 int error;
203
204 error = vfs_fstatat(dfd, filename, &stat, flag);
205 if (error)
206 return error;
207 return cp_compat_stat(&stat, statbuf);
208 }
209 #endif
210
211 asmlinkage 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
222 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
223 {
224
225 if (sizeof ubuf->f_blocks == 4) {
226 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
227 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
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 /*
260 * The following statfs calls are copies of code from fs/statfs.c and
261 * should be checked against those from time to time
262 */
263 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
264 {
265 struct kstatfs tmp;
266 int error = user_statfs(pathname, &tmp);
267 if (!error)
268 error = put_compat_statfs(buf, &tmp);
269 return error;
270 }
271
272 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
273 {
274 struct kstatfs tmp;
275 int error = fd_statfs(fd, &tmp);
276 if (!error)
277 error = put_compat_statfs(buf, &tmp);
278 return error;
279 }
280
281 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
282 {
283 if (sizeof ubuf->f_blocks == 4) {
284 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
285 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
286 return -EOVERFLOW;
287 /* f_files and f_ffree may be -1; it's okay
288 * to stuff that into 32 bits */
289 if (kbuf->f_files != 0xffffffffffffffffULL
290 && (kbuf->f_files & 0xffffffff00000000ULL))
291 return -EOVERFLOW;
292 if (kbuf->f_ffree != 0xffffffffffffffffULL
293 && (kbuf->f_ffree & 0xffffffff00000000ULL))
294 return -EOVERFLOW;
295 }
296 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
297 __put_user(kbuf->f_type, &ubuf->f_type) ||
298 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
299 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
300 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
301 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
302 __put_user(kbuf->f_files, &ubuf->f_files) ||
303 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
304 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
305 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
306 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
307 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
308 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
309 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
310 return -EFAULT;
311 return 0;
312 }
313
314 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
315 {
316 struct kstatfs tmp;
317 int error;
318
319 if (sz != sizeof(*buf))
320 return -EINVAL;
321
322 error = user_statfs(pathname, &tmp);
323 if (!error)
324 error = put_compat_statfs64(buf, &tmp);
325 return error;
326 }
327
328 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
329 {
330 struct kstatfs tmp;
331 int error;
332
333 if (sz != sizeof(*buf))
334 return -EINVAL;
335
336 error = fd_statfs(fd, &tmp);
337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
339 return error;
340 }
341
342 /*
343 * This is a copy of sys_ustat, just dealing with a structure layout.
344 * Given how simple this syscall is that apporach is more maintainable
345 * than the various conversion hacks.
346 */
347 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
348 {
349 struct super_block *sb;
350 struct compat_ustat tmp;
351 struct kstatfs sbuf;
352 int err;
353
354 sb = user_get_super(new_decode_dev(dev));
355 if (!sb)
356 return -EINVAL;
357 err = statfs_by_dentry(sb->s_root, &sbuf);
358 drop_super(sb);
359 if (err)
360 return err;
361
362 memset(&tmp, 0, sizeof(struct compat_ustat));
363 tmp.f_tfree = sbuf.f_bfree;
364 tmp.f_tinode = sbuf.f_ffree;
365 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
366 return -EFAULT;
367 return 0;
368 }
369
370 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
371 {
372 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
373 __get_user(kfl->l_type, &ufl->l_type) ||
374 __get_user(kfl->l_whence, &ufl->l_whence) ||
375 __get_user(kfl->l_start, &ufl->l_start) ||
376 __get_user(kfl->l_len, &ufl->l_len) ||
377 __get_user(kfl->l_pid, &ufl->l_pid))
378 return -EFAULT;
379 return 0;
380 }
381
382 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
383 {
384 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
385 __put_user(kfl->l_type, &ufl->l_type) ||
386 __put_user(kfl->l_whence, &ufl->l_whence) ||
387 __put_user(kfl->l_start, &ufl->l_start) ||
388 __put_user(kfl->l_len, &ufl->l_len) ||
389 __put_user(kfl->l_pid, &ufl->l_pid))
390 return -EFAULT;
391 return 0;
392 }
393
394 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
395 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
396 {
397 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
398 __get_user(kfl->l_type, &ufl->l_type) ||
399 __get_user(kfl->l_whence, &ufl->l_whence) ||
400 __get_user(kfl->l_start, &ufl->l_start) ||
401 __get_user(kfl->l_len, &ufl->l_len) ||
402 __get_user(kfl->l_pid, &ufl->l_pid))
403 return -EFAULT;
404 return 0;
405 }
406 #endif
407
408 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
409 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
410 {
411 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
412 __put_user(kfl->l_type, &ufl->l_type) ||
413 __put_user(kfl->l_whence, &ufl->l_whence) ||
414 __put_user(kfl->l_start, &ufl->l_start) ||
415 __put_user(kfl->l_len, &ufl->l_len) ||
416 __put_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419 }
420 #endif
421
422 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
423 unsigned long arg)
424 {
425 mm_segment_t old_fs;
426 struct flock f;
427 long ret;
428
429 switch (cmd) {
430 case F_GETLK:
431 case F_SETLK:
432 case F_SETLKW:
433 ret = get_compat_flock(&f, compat_ptr(arg));
434 if (ret != 0)
435 break;
436 old_fs = get_fs();
437 set_fs(KERNEL_DS);
438 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
439 set_fs(old_fs);
440 if (cmd == F_GETLK && ret == 0) {
441 /* GETLK was successful and we need to return the data...
442 * but it needs to fit in the compat structure.
443 * l_start shouldn't be too big, unless the original
444 * start + end is greater than COMPAT_OFF_T_MAX, in which
445 * case the app was asking for trouble, so we return
446 * -EOVERFLOW in that case.
447 * l_len could be too big, in which case we just truncate it,
448 * and only allow the app to see that part of the conflicting
449 * lock that might make sense to it anyway
450 */
451
452 if (f.l_start > COMPAT_OFF_T_MAX)
453 ret = -EOVERFLOW;
454 if (f.l_len > COMPAT_OFF_T_MAX)
455 f.l_len = COMPAT_OFF_T_MAX;
456 if (ret == 0)
457 ret = put_compat_flock(&f, compat_ptr(arg));
458 }
459 break;
460
461 case F_GETLK64:
462 case F_SETLK64:
463 case F_SETLKW64:
464 ret = get_compat_flock64(&f, compat_ptr(arg));
465 if (ret != 0)
466 break;
467 old_fs = get_fs();
468 set_fs(KERNEL_DS);
469 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
470 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
471 (unsigned long)&f);
472 set_fs(old_fs);
473 if (cmd == F_GETLK64 && ret == 0) {
474 /* need to return lock information - see above for commentary */
475 if (f.l_start > COMPAT_LOFF_T_MAX)
476 ret = -EOVERFLOW;
477 if (f.l_len > COMPAT_LOFF_T_MAX)
478 f.l_len = COMPAT_LOFF_T_MAX;
479 if (ret == 0)
480 ret = put_compat_flock64(&f, compat_ptr(arg));
481 }
482 break;
483
484 default:
485 ret = sys_fcntl(fd, cmd, arg);
486 break;
487 }
488 return ret;
489 }
490
491 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
492 unsigned long arg)
493 {
494 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
495 return -EINVAL;
496 return compat_sys_fcntl64(fd, cmd, arg);
497 }
498
499 asmlinkage long
500 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
501 {
502 long ret;
503 aio_context_t ctx64;
504
505 mm_segment_t oldfs = get_fs();
506 if (unlikely(get_user(ctx64, ctx32p)))
507 return -EFAULT;
508
509 set_fs(KERNEL_DS);
510 /* The __user pointer cast is valid because of the set_fs() */
511 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
512 set_fs(oldfs);
513 /* truncating is ok because it's a user address */
514 if (!ret)
515 ret = put_user((u32) ctx64, ctx32p);
516 return ret;
517 }
518
519 asmlinkage long
520 compat_sys_io_getevents(aio_context_t ctx_id,
521 unsigned long min_nr,
522 unsigned long nr,
523 struct io_event __user *events,
524 struct compat_timespec __user *timeout)
525 {
526 long ret;
527 struct timespec t;
528 struct timespec __user *ut = NULL;
529
530 ret = -EFAULT;
531 if (unlikely(!access_ok(VERIFY_WRITE, events,
532 nr * sizeof(struct io_event))))
533 goto out;
534 if (timeout) {
535 if (get_compat_timespec(&t, timeout))
536 goto out;
537
538 ut = compat_alloc_user_space(sizeof(*ut));
539 if (copy_to_user(ut, &t, sizeof(t)) )
540 goto out;
541 }
542 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
543 out:
544 return ret;
545 }
546
547 /* A write operation does a read from user space and vice versa */
548 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
549
550 ssize_t compat_rw_copy_check_uvector(int type,
551 const struct compat_iovec __user *uvector, unsigned long nr_segs,
552 unsigned long fast_segs, struct iovec *fast_pointer,
553 struct iovec **ret_pointer)
554 {
555 compat_ssize_t tot_len;
556 struct iovec *iov = *ret_pointer = fast_pointer;
557 ssize_t ret = 0;
558 int seg;
559
560 /*
561 * SuS says "The readv() function *may* fail if the iovcnt argument
562 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
563 * traditionally returned zero for zero segments, so...
564 */
565 if (nr_segs == 0)
566 goto out;
567
568 ret = -EINVAL;
569 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
570 goto out;
571 if (nr_segs > fast_segs) {
572 ret = -ENOMEM;
573 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
574 if (iov == NULL)
575 goto out;
576 }
577 *ret_pointer = iov;
578
579 /*
580 * Single unix specification:
581 * We should -EINVAL if an element length is not >= 0 and fitting an
582 * ssize_t.
583 *
584 * In Linux, the total length is limited to MAX_RW_COUNT, there is
585 * no overflow possibility.
586 */
587 tot_len = 0;
588 ret = -EINVAL;
589 for (seg = 0; seg < nr_segs; seg++) {
590 compat_uptr_t buf;
591 compat_ssize_t len;
592
593 if (__get_user(len, &uvector->iov_len) ||
594 __get_user(buf, &uvector->iov_base)) {
595 ret = -EFAULT;
596 goto out;
597 }
598 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599 goto out;
600 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
601 ret = -EFAULT;
602 goto out;
603 }
604 if (len > MAX_RW_COUNT - tot_len)
605 len = MAX_RW_COUNT - tot_len;
606 tot_len += len;
607 iov->iov_base = compat_ptr(buf);
608 iov->iov_len = (compat_size_t) len;
609 uvector++;
610 iov++;
611 }
612 ret = tot_len;
613
614 out:
615 return ret;
616 }
617
618 static inline long
619 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
620 {
621 compat_uptr_t uptr;
622 int i;
623
624 for (i = 0; i < nr; ++i) {
625 if (get_user(uptr, ptr32 + i))
626 return -EFAULT;
627 if (put_user(compat_ptr(uptr), ptr64 + i))
628 return -EFAULT;
629 }
630 return 0;
631 }
632
633 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
634
635 asmlinkage long
636 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
637 {
638 struct iocb __user * __user *iocb64;
639 long ret;
640
641 if (unlikely(nr < 0))
642 return -EINVAL;
643
644 if (nr > MAX_AIO_SUBMITS)
645 nr = MAX_AIO_SUBMITS;
646
647 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
648 ret = copy_iocb(nr, iocb, iocb64);
649 if (!ret)
650 ret = do_io_submit(ctx_id, nr, iocb64, 1);
651 return ret;
652 }
653
654 struct compat_ncp_mount_data {
655 compat_int_t version;
656 compat_uint_t ncp_fd;
657 __compat_uid_t mounted_uid;
658 compat_pid_t wdog_pid;
659 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
660 compat_uint_t time_out;
661 compat_uint_t retry_count;
662 compat_uint_t flags;
663 __compat_uid_t uid;
664 __compat_gid_t gid;
665 compat_mode_t file_mode;
666 compat_mode_t dir_mode;
667 };
668
669 struct compat_ncp_mount_data_v4 {
670 compat_int_t version;
671 compat_ulong_t flags;
672 compat_ulong_t mounted_uid;
673 compat_long_t wdog_pid;
674 compat_uint_t ncp_fd;
675 compat_uint_t time_out;
676 compat_uint_t retry_count;
677 compat_ulong_t uid;
678 compat_ulong_t gid;
679 compat_ulong_t file_mode;
680 compat_ulong_t dir_mode;
681 };
682
683 static void *do_ncp_super_data_conv(void *raw_data)
684 {
685 int version = *(unsigned int *)raw_data;
686
687 if (version == 3) {
688 struct compat_ncp_mount_data *c_n = raw_data;
689 struct ncp_mount_data *n = raw_data;
690
691 n->dir_mode = c_n->dir_mode;
692 n->file_mode = c_n->file_mode;
693 n->gid = c_n->gid;
694 n->uid = c_n->uid;
695 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
696 n->wdog_pid = c_n->wdog_pid;
697 n->mounted_uid = c_n->mounted_uid;
698 } else if (version == 4) {
699 struct compat_ncp_mount_data_v4 *c_n = raw_data;
700 struct ncp_mount_data_v4 *n = raw_data;
701
702 n->dir_mode = c_n->dir_mode;
703 n->file_mode = c_n->file_mode;
704 n->gid = c_n->gid;
705 n->uid = c_n->uid;
706 n->retry_count = c_n->retry_count;
707 n->time_out = c_n->time_out;
708 n->ncp_fd = c_n->ncp_fd;
709 n->wdog_pid = c_n->wdog_pid;
710 n->mounted_uid = c_n->mounted_uid;
711 n->flags = c_n->flags;
712 } else if (version != 5) {
713 return NULL;
714 }
715
716 return raw_data;
717 }
718
719
720 struct compat_nfs_string {
721 compat_uint_t len;
722 compat_uptr_t data;
723 };
724
725 static inline void compat_nfs_string(struct nfs_string *dst,
726 struct compat_nfs_string *src)
727 {
728 dst->data = compat_ptr(src->data);
729 dst->len = src->len;
730 }
731
732 struct compat_nfs4_mount_data_v1 {
733 compat_int_t version;
734 compat_int_t flags;
735 compat_int_t rsize;
736 compat_int_t wsize;
737 compat_int_t timeo;
738 compat_int_t retrans;
739 compat_int_t acregmin;
740 compat_int_t acregmax;
741 compat_int_t acdirmin;
742 compat_int_t acdirmax;
743 struct compat_nfs_string client_addr;
744 struct compat_nfs_string mnt_path;
745 struct compat_nfs_string hostname;
746 compat_uint_t host_addrlen;
747 compat_uptr_t host_addr;
748 compat_int_t proto;
749 compat_int_t auth_flavourlen;
750 compat_uptr_t auth_flavours;
751 };
752
753 static int do_nfs4_super_data_conv(void *raw_data)
754 {
755 int version = *(compat_uint_t *) raw_data;
756
757 if (version == 1) {
758 struct compat_nfs4_mount_data_v1 *raw = raw_data;
759 struct nfs4_mount_data *real = raw_data;
760
761 /* copy the fields backwards */
762 real->auth_flavours = compat_ptr(raw->auth_flavours);
763 real->auth_flavourlen = raw->auth_flavourlen;
764 real->proto = raw->proto;
765 real->host_addr = compat_ptr(raw->host_addr);
766 real->host_addrlen = raw->host_addrlen;
767 compat_nfs_string(&real->hostname, &raw->hostname);
768 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
769 compat_nfs_string(&real->client_addr, &raw->client_addr);
770 real->acdirmax = raw->acdirmax;
771 real->acdirmin = raw->acdirmin;
772 real->acregmax = raw->acregmax;
773 real->acregmin = raw->acregmin;
774 real->retrans = raw->retrans;
775 real->timeo = raw->timeo;
776 real->wsize = raw->wsize;
777 real->rsize = raw->rsize;
778 real->flags = raw->flags;
779 real->version = raw->version;
780 }
781
782 return 0;
783 }
784
785 #define NCPFS_NAME "ncpfs"
786 #define NFS4_NAME "nfs4"
787
788 asmlinkage long compat_sys_mount(const char __user * dev_name,
789 const char __user * dir_name,
790 const char __user * type, unsigned long flags,
791 const void __user * data)
792 {
793 char *kernel_type;
794 unsigned long data_page;
795 char *kernel_dev;
796 char *dir_page;
797 int retval;
798
799 retval = copy_mount_string(type, &kernel_type);
800 if (retval < 0)
801 goto out;
802
803 dir_page = getname(dir_name);
804 retval = PTR_ERR(dir_page);
805 if (IS_ERR(dir_page))
806 goto out1;
807
808 retval = copy_mount_string(dev_name, &kernel_dev);
809 if (retval < 0)
810 goto out2;
811
812 retval = copy_mount_options(data, &data_page);
813 if (retval < 0)
814 goto out3;
815
816 retval = -EINVAL;
817
818 if (kernel_type && data_page) {
819 if (!strcmp(kernel_type, NCPFS_NAME)) {
820 do_ncp_super_data_conv((void *)data_page);
821 } else if (!strcmp(kernel_type, NFS4_NAME)) {
822 if (do_nfs4_super_data_conv((void *) data_page))
823 goto out4;
824 }
825 }
826
827 retval = do_mount(kernel_dev, dir_page, kernel_type,
828 flags, (void*)data_page);
829
830 out4:
831 free_page(data_page);
832 out3:
833 kfree(kernel_dev);
834 out2:
835 putname(dir_page);
836 out1:
837 kfree(kernel_type);
838 out:
839 return retval;
840 }
841
842 struct compat_old_linux_dirent {
843 compat_ulong_t d_ino;
844 compat_ulong_t d_offset;
845 unsigned short d_namlen;
846 char d_name[1];
847 };
848
849 struct compat_readdir_callback {
850 struct compat_old_linux_dirent __user *dirent;
851 int result;
852 };
853
854 static int compat_fillonedir(void *__buf, const char *name, int namlen,
855 loff_t offset, u64 ino, unsigned int d_type)
856 {
857 struct compat_readdir_callback *buf = __buf;
858 struct compat_old_linux_dirent __user *dirent;
859 compat_ulong_t d_ino;
860
861 if (buf->result)
862 return -EINVAL;
863 d_ino = ino;
864 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
865 buf->result = -EOVERFLOW;
866 return -EOVERFLOW;
867 }
868 buf->result++;
869 dirent = buf->dirent;
870 if (!access_ok(VERIFY_WRITE, dirent,
871 (unsigned long)(dirent->d_name + namlen + 1) -
872 (unsigned long)dirent))
873 goto efault;
874 if ( __put_user(d_ino, &dirent->d_ino) ||
875 __put_user(offset, &dirent->d_offset) ||
876 __put_user(namlen, &dirent->d_namlen) ||
877 __copy_to_user(dirent->d_name, name, namlen) ||
878 __put_user(0, dirent->d_name + namlen))
879 goto efault;
880 return 0;
881 efault:
882 buf->result = -EFAULT;
883 return -EFAULT;
884 }
885
886 asmlinkage long compat_sys_old_readdir(unsigned int fd,
887 struct compat_old_linux_dirent __user *dirent, unsigned int count)
888 {
889 int error;
890 struct file *file;
891 struct compat_readdir_callback buf;
892
893 error = -EBADF;
894 file = fget(fd);
895 if (!file)
896 goto out;
897
898 buf.result = 0;
899 buf.dirent = dirent;
900
901 error = vfs_readdir(file, compat_fillonedir, &buf);
902 if (buf.result)
903 error = buf.result;
904
905 fput(file);
906 out:
907 return error;
908 }
909
910 struct compat_linux_dirent {
911 compat_ulong_t d_ino;
912 compat_ulong_t d_off;
913 unsigned short d_reclen;
914 char d_name[1];
915 };
916
917 struct compat_getdents_callback {
918 struct compat_linux_dirent __user *current_dir;
919 struct compat_linux_dirent __user *previous;
920 int count;
921 int error;
922 };
923
924 static int compat_filldir(void *__buf, const char *name, int namlen,
925 loff_t offset, u64 ino, unsigned int d_type)
926 {
927 struct compat_linux_dirent __user * dirent;
928 struct compat_getdents_callback *buf = __buf;
929 compat_ulong_t d_ino;
930 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
931 namlen + 2, sizeof(compat_long_t));
932
933 buf->error = -EINVAL; /* only used if we fail.. */
934 if (reclen > buf->count)
935 return -EINVAL;
936 d_ino = ino;
937 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
938 buf->error = -EOVERFLOW;
939 return -EOVERFLOW;
940 }
941 dirent = buf->previous;
942 if (dirent) {
943 if (__put_user(offset, &dirent->d_off))
944 goto efault;
945 }
946 dirent = buf->current_dir;
947 if (__put_user(d_ino, &dirent->d_ino))
948 goto efault;
949 if (__put_user(reclen, &dirent->d_reclen))
950 goto efault;
951 if (copy_to_user(dirent->d_name, name, namlen))
952 goto efault;
953 if (__put_user(0, dirent->d_name + namlen))
954 goto efault;
955 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
956 goto efault;
957 buf->previous = dirent;
958 dirent = (void __user *)dirent + reclen;
959 buf->current_dir = dirent;
960 buf->count -= reclen;
961 return 0;
962 efault:
963 buf->error = -EFAULT;
964 return -EFAULT;
965 }
966
967 asmlinkage long compat_sys_getdents(unsigned int fd,
968 struct compat_linux_dirent __user *dirent, unsigned int count)
969 {
970 struct file * file;
971 struct compat_linux_dirent __user * lastdirent;
972 struct compat_getdents_callback buf;
973 int error;
974
975 error = -EFAULT;
976 if (!access_ok(VERIFY_WRITE, dirent, count))
977 goto out;
978
979 error = -EBADF;
980 file = fget(fd);
981 if (!file)
982 goto out;
983
984 buf.current_dir = dirent;
985 buf.previous = NULL;
986 buf.count = count;
987 buf.error = 0;
988
989 error = vfs_readdir(file, compat_filldir, &buf);
990 if (error >= 0)
991 error = buf.error;
992 lastdirent = buf.previous;
993 if (lastdirent) {
994 if (put_user(file->f_pos, &lastdirent->d_off))
995 error = -EFAULT;
996 else
997 error = count - buf.count;
998 }
999 fput(file);
1000 out:
1001 return error;
1002 }
1003
1004 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1005
1006 struct compat_getdents_callback64 {
1007 struct linux_dirent64 __user *current_dir;
1008 struct linux_dirent64 __user *previous;
1009 int count;
1010 int error;
1011 };
1012
1013 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1014 u64 ino, unsigned int d_type)
1015 {
1016 struct linux_dirent64 __user *dirent;
1017 struct compat_getdents_callback64 *buf = __buf;
1018 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1019 sizeof(u64));
1020 u64 off;
1021
1022 buf->error = -EINVAL; /* only used if we fail.. */
1023 if (reclen > buf->count)
1024 return -EINVAL;
1025 dirent = buf->previous;
1026
1027 if (dirent) {
1028 if (__put_user_unaligned(offset, &dirent->d_off))
1029 goto efault;
1030 }
1031 dirent = buf->current_dir;
1032 if (__put_user_unaligned(ino, &dirent->d_ino))
1033 goto efault;
1034 off = 0;
1035 if (__put_user_unaligned(off, &dirent->d_off))
1036 goto efault;
1037 if (__put_user(reclen, &dirent->d_reclen))
1038 goto efault;
1039 if (__put_user(d_type, &dirent->d_type))
1040 goto efault;
1041 if (copy_to_user(dirent->d_name, name, namlen))
1042 goto efault;
1043 if (__put_user(0, dirent->d_name + namlen))
1044 goto efault;
1045 buf->previous = dirent;
1046 dirent = (void __user *)dirent + reclen;
1047 buf->current_dir = dirent;
1048 buf->count -= reclen;
1049 return 0;
1050 efault:
1051 buf->error = -EFAULT;
1052 return -EFAULT;
1053 }
1054
1055 asmlinkage long compat_sys_getdents64(unsigned int fd,
1056 struct linux_dirent64 __user * dirent, unsigned int count)
1057 {
1058 struct file * file;
1059 struct linux_dirent64 __user * lastdirent;
1060 struct compat_getdents_callback64 buf;
1061 int error;
1062
1063 error = -EFAULT;
1064 if (!access_ok(VERIFY_WRITE, dirent, count))
1065 goto out;
1066
1067 error = -EBADF;
1068 file = fget(fd);
1069 if (!file)
1070 goto out;
1071
1072 buf.current_dir = dirent;
1073 buf.previous = NULL;
1074 buf.count = count;
1075 buf.error = 0;
1076
1077 error = vfs_readdir(file, compat_filldir64, &buf);
1078 if (error >= 0)
1079 error = buf.error;
1080 lastdirent = buf.previous;
1081 if (lastdirent) {
1082 typeof(lastdirent->d_off) d_off = file->f_pos;
1083 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1084 error = -EFAULT;
1085 else
1086 error = count - buf.count;
1087 }
1088 fput(file);
1089 out:
1090 return error;
1091 }
1092 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1093
1094 static ssize_t compat_do_readv_writev(int type, struct file *file,
1095 const struct compat_iovec __user *uvector,
1096 unsigned long nr_segs, loff_t *pos)
1097 {
1098 compat_ssize_t tot_len;
1099 struct iovec iovstack[UIO_FASTIOV];
1100 struct iovec *iov = iovstack;
1101 ssize_t ret;
1102 io_fn_t fn;
1103 iov_fn_t fnv;
1104
1105 ret = -EINVAL;
1106 if (!file->f_op)
1107 goto out;
1108
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1114 UIO_FASTIOV, iovstack, &iov);
1115 if (tot_len == 0) {
1116 ret = 0;
1117 goto out;
1118 }
1119
1120 ret = rw_verify_area(type, file, pos, tot_len);
1121 if (ret < 0)
1122 goto out;
1123
1124 fnv = NULL;
1125 if (type == READ) {
1126 fn = file->f_op->read;
1127 fnv = file->f_op->aio_read;
1128 } else {
1129 fn = (io_fn_t)file->f_op->write;
1130 fnv = file->f_op->aio_write;
1131 }
1132
1133 if (fnv)
1134 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1135 pos, fnv);
1136 else
1137 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1138
1139 out:
1140 if (iov != iovstack)
1141 kfree(iov);
1142 if ((ret + (type == READ)) > 0) {
1143 if (type == READ)
1144 fsnotify_access(file);
1145 else
1146 fsnotify_modify(file);
1147 }
1148 return ret;
1149 }
1150
1151 static size_t compat_readv(struct file *file,
1152 const struct compat_iovec __user *vec,
1153 unsigned long vlen, loff_t *pos)
1154 {
1155 ssize_t ret = -EBADF;
1156
1157 if (!(file->f_mode & FMODE_READ))
1158 goto out;
1159
1160 ret = -EINVAL;
1161 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1162 goto out;
1163
1164 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1165
1166 out:
1167 if (ret > 0)
1168 add_rchar(current, ret);
1169 inc_syscr(current);
1170 return ret;
1171 }
1172
1173 asmlinkage ssize_t
1174 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1175 unsigned long vlen)
1176 {
1177 struct file *file;
1178 int fput_needed;
1179 ssize_t ret;
1180
1181 file = fget_light(fd, &fput_needed);
1182 if (!file)
1183 return -EBADF;
1184 ret = compat_readv(file, vec, vlen, &file->f_pos);
1185 fput_light(file, fput_needed);
1186 return ret;
1187 }
1188
1189 asmlinkage ssize_t
1190 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1191 unsigned long vlen, u32 pos_low, u32 pos_high)
1192 {
1193 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1194 struct file *file;
1195 int fput_needed;
1196 ssize_t ret;
1197
1198 if (pos < 0)
1199 return -EINVAL;
1200 file = fget_light(fd, &fput_needed);
1201 if (!file)
1202 return -EBADF;
1203 ret = -ESPIPE;
1204 if (file->f_mode & FMODE_PREAD)
1205 ret = compat_readv(file, vec, vlen, &pos);
1206 fput_light(file, fput_needed);
1207 return ret;
1208 }
1209
1210 static size_t compat_writev(struct file *file,
1211 const struct compat_iovec __user *vec,
1212 unsigned long vlen, loff_t *pos)
1213 {
1214 ssize_t ret = -EBADF;
1215
1216 if (!(file->f_mode & FMODE_WRITE))
1217 goto out;
1218
1219 ret = -EINVAL;
1220 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1221 goto out;
1222
1223 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1224
1225 out:
1226 if (ret > 0)
1227 add_wchar(current, ret);
1228 inc_syscw(current);
1229 return ret;
1230 }
1231
1232 asmlinkage ssize_t
1233 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1234 unsigned long vlen)
1235 {
1236 struct file *file;
1237 int fput_needed;
1238 ssize_t ret;
1239
1240 file = fget_light(fd, &fput_needed);
1241 if (!file)
1242 return -EBADF;
1243 ret = compat_writev(file, vec, vlen, &file->f_pos);
1244 fput_light(file, fput_needed);
1245 return ret;
1246 }
1247
1248 asmlinkage ssize_t
1249 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1250 unsigned long vlen, u32 pos_low, u32 pos_high)
1251 {
1252 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1253 struct file *file;
1254 int fput_needed;
1255 ssize_t ret;
1256
1257 if (pos < 0)
1258 return -EINVAL;
1259 file = fget_light(fd, &fput_needed);
1260 if (!file)
1261 return -EBADF;
1262 ret = -ESPIPE;
1263 if (file->f_mode & FMODE_PWRITE)
1264 ret = compat_writev(file, vec, vlen, &pos);
1265 fput_light(file, fput_needed);
1266 return ret;
1267 }
1268
1269 asmlinkage long
1270 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1271 unsigned int nr_segs, unsigned int flags)
1272 {
1273 unsigned i;
1274 struct iovec __user *iov;
1275 if (nr_segs > UIO_MAXIOV)
1276 return -EINVAL;
1277 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1278 for (i = 0; i < nr_segs; i++) {
1279 struct compat_iovec v;
1280 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1281 get_user(v.iov_len, &iov32[i].iov_len) ||
1282 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1283 put_user(v.iov_len, &iov[i].iov_len))
1284 return -EFAULT;
1285 }
1286 return sys_vmsplice(fd, iov, nr_segs, flags);
1287 }
1288
1289 /*
1290 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1291 * O_LARGEFILE flag.
1292 */
1293 asmlinkage long
1294 compat_sys_open(const char __user *filename, int flags, int mode)
1295 {
1296 return do_sys_open(AT_FDCWD, filename, flags, mode);
1297 }
1298
1299 /*
1300 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1301 * O_LARGEFILE flag.
1302 */
1303 asmlinkage long
1304 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1305 {
1306 return do_sys_open(dfd, filename, flags, mode);
1307 }
1308
1309 /*
1310 * compat_count() counts the number of arguments/envelopes. It is basically
1311 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1312 * and envp pointers.
1313 */
1314 static int compat_count(compat_uptr_t __user *argv, int max)
1315 {
1316 int i = 0;
1317
1318 if (argv != NULL) {
1319 for (;;) {
1320 compat_uptr_t p;
1321
1322 if (get_user(p, argv))
1323 return -EFAULT;
1324 if (!p)
1325 break;
1326 argv++;
1327 if (i++ >= max)
1328 return -E2BIG;
1329
1330 if (fatal_signal_pending(current))
1331 return -ERESTARTNOHAND;
1332 cond_resched();
1333 }
1334 }
1335 return i;
1336 }
1337
1338 /*
1339 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1340 * except that it works with 32 bit argv and envp pointers.
1341 */
1342 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1343 struct linux_binprm *bprm)
1344 {
1345 struct page *kmapped_page = NULL;
1346 char *kaddr = NULL;
1347 unsigned long kpos = 0;
1348 int ret;
1349
1350 while (argc-- > 0) {
1351 compat_uptr_t str;
1352 int len;
1353 unsigned long pos;
1354
1355 if (get_user(str, argv+argc) ||
1356 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1357 ret = -EFAULT;
1358 goto out;
1359 }
1360
1361 if (len > MAX_ARG_STRLEN) {
1362 ret = -E2BIG;
1363 goto out;
1364 }
1365
1366 /* We're going to work our way backwords. */
1367 pos = bprm->p;
1368 str += len;
1369 bprm->p -= len;
1370
1371 while (len > 0) {
1372 int offset, bytes_to_copy;
1373
1374 if (fatal_signal_pending(current)) {
1375 ret = -ERESTARTNOHAND;
1376 goto out;
1377 }
1378 cond_resched();
1379
1380 offset = pos % PAGE_SIZE;
1381 if (offset == 0)
1382 offset = PAGE_SIZE;
1383
1384 bytes_to_copy = offset;
1385 if (bytes_to_copy > len)
1386 bytes_to_copy = len;
1387
1388 offset -= bytes_to_copy;
1389 pos -= bytes_to_copy;
1390 str -= bytes_to_copy;
1391 len -= bytes_to_copy;
1392
1393 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1394 struct page *page;
1395
1396 page = get_arg_page(bprm, pos, 1);
1397 if (!page) {
1398 ret = -E2BIG;
1399 goto out;
1400 }
1401
1402 if (kmapped_page) {
1403 flush_kernel_dcache_page(kmapped_page);
1404 kunmap(kmapped_page);
1405 put_page(kmapped_page);
1406 }
1407 kmapped_page = page;
1408 kaddr = kmap(kmapped_page);
1409 kpos = pos & PAGE_MASK;
1410 flush_cache_page(bprm->vma, kpos,
1411 page_to_pfn(kmapped_page));
1412 }
1413 if (copy_from_user(kaddr+offset, compat_ptr(str),
1414 bytes_to_copy)) {
1415 ret = -EFAULT;
1416 goto out;
1417 }
1418 }
1419 }
1420 ret = 0;
1421 out:
1422 if (kmapped_page) {
1423 flush_kernel_dcache_page(kmapped_page);
1424 kunmap(kmapped_page);
1425 put_page(kmapped_page);
1426 }
1427 return ret;
1428 }
1429
1430 /*
1431 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1432 * that it processes 32 bit argv and envp pointers.
1433 */
1434 int compat_do_execve(char * filename,
1435 compat_uptr_t __user *argv,
1436 compat_uptr_t __user *envp,
1437 struct pt_regs * regs)
1438 {
1439 struct linux_binprm *bprm;
1440 struct file *file;
1441 struct files_struct *displaced;
1442 bool clear_in_exec;
1443 int retval;
1444
1445 retval = unshare_files(&displaced);
1446 if (retval)
1447 goto out_ret;
1448
1449 retval = -ENOMEM;
1450 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1451 if (!bprm)
1452 goto out_files;
1453
1454 retval = prepare_bprm_creds(bprm);
1455 if (retval)
1456 goto out_free;
1457
1458 retval = check_unsafe_exec(bprm);
1459 if (retval < 0)
1460 goto out_free;
1461 clear_in_exec = retval;
1462 current->in_execve = 1;
1463
1464 file = open_exec(filename);
1465 retval = PTR_ERR(file);
1466 if (IS_ERR(file))
1467 goto out_unmark;
1468
1469 sched_exec();
1470
1471 bprm->file = file;
1472 bprm->filename = filename;
1473 bprm->interp = filename;
1474
1475 retval = bprm_mm_init(bprm);
1476 if (retval)
1477 goto out_file;
1478
1479 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1480 if ((retval = bprm->argc) < 0)
1481 goto out;
1482
1483 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1484 if ((retval = bprm->envc) < 0)
1485 goto out;
1486
1487 retval = prepare_binprm(bprm);
1488 if (retval < 0)
1489 goto out;
1490
1491 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1492 if (retval < 0)
1493 goto out;
1494
1495 bprm->exec = bprm->p;
1496 retval = compat_copy_strings(bprm->envc, envp, bprm);
1497 if (retval < 0)
1498 goto out;
1499
1500 retval = compat_copy_strings(bprm->argc, argv, bprm);
1501 if (retval < 0)
1502 goto out;
1503
1504 retval = search_binary_handler(bprm, regs);
1505 if (retval < 0)
1506 goto out;
1507
1508 /* execve succeeded */
1509 current->fs->in_exec = 0;
1510 current->in_execve = 0;
1511 acct_update_integrals(current);
1512 free_bprm(bprm);
1513 if (displaced)
1514 put_files_struct(displaced);
1515 return retval;
1516
1517 out:
1518 if (bprm->mm) {
1519 acct_arg_size(bprm, 0);
1520 mmput(bprm->mm);
1521 }
1522
1523 out_file:
1524 if (bprm->file) {
1525 allow_write_access(bprm->file);
1526 fput(bprm->file);
1527 }
1528
1529 out_unmark:
1530 if (clear_in_exec)
1531 current->fs->in_exec = 0;
1532 current->in_execve = 0;
1533
1534 out_free:
1535 free_bprm(bprm);
1536
1537 out_files:
1538 if (displaced)
1539 reset_files_struct(displaced);
1540 out_ret:
1541 return retval;
1542 }
1543
1544 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1545
1546 static 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
1591 sticky:
1592 if (ret == -ERESTARTNOHAND)
1593 ret = -EINTR;
1594 return ret;
1595 }
1596
1597 /*
1598 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1599 * 64-bit unsigned longs.
1600 */
1601 static
1602 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1603 unsigned long *fdset)
1604 {
1605 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
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;
1616 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1617 return -EFAULT;
1618 ufdset += 2;
1619 *fdset++ = h << 32 | l;
1620 nr -= 2;
1621 }
1622 if (odd && __get_user(*fdset, ufdset))
1623 return -EFAULT;
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
1634 static
1635 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1636 unsigned long *fdset)
1637 {
1638 unsigned long odd;
1639 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1640
1641 if (!ufdset)
1642 return 0;
1643
1644 odd = nr & 1UL;
1645 nr &= ~1UL;
1646 while (nr) {
1647 unsigned long h, l;
1648 l = *fdset++;
1649 h = l >> 32;
1650 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1651 return -EFAULT;
1652 ufdset += 2;
1653 nr -= 2;
1654 }
1655 if (odd && __put_user(*fdset, ufdset))
1656 return -EFAULT;
1657 return 0;
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 */
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 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1675 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1676 struct timespec *end_time)
1677 {
1678 fd_set_bits fds;
1679 void *bits;
1680 int size, max_fds, ret = -EINVAL;
1681 struct fdtable *fdt;
1682 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1683
1684 if (n < 0)
1685 goto out_nofds;
1686
1687 /* max_fds can increase, so grab it once to avoid race */
1688 rcu_read_lock();
1689 fdt = files_fdtable(current->files);
1690 max_fds = fdt->max_fds;
1691 rcu_read_unlock();
1692 if (n > max_fds)
1693 n = max_fds;
1694
1695 /*
1696 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1697 * since we used fdset we need to allocate memory in units of
1698 * long-words.
1699 */
1700 size = FDS_BYTES(n);
1701 bits = stack_fds;
1702 if (size > sizeof(stack_fds) / 6) {
1703 bits = kmalloc(6 * size, GFP_KERNEL);
1704 ret = -ENOMEM;
1705 if (!bits)
1706 goto out_nofds;
1707 }
1708 fds.in = (unsigned long *) bits;
1709 fds.out = (unsigned long *) (bits + size);
1710 fds.ex = (unsigned long *) (bits + 2*size);
1711 fds.res_in = (unsigned long *) (bits + 3*size);
1712 fds.res_out = (unsigned long *) (bits + 4*size);
1713 fds.res_ex = (unsigned long *) (bits + 5*size);
1714
1715 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1716 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1717 (ret = compat_get_fd_set(n, exp, fds.ex)))
1718 goto out;
1719 zero_fd_set(n, fds.res_in);
1720 zero_fd_set(n, fds.res_out);
1721 zero_fd_set(n, fds.res_ex);
1722
1723 ret = do_select(n, &fds, end_time);
1724
1725 if (ret < 0)
1726 goto out;
1727 if (!ret) {
1728 ret = -ERESTARTNOHAND;
1729 if (signal_pending(current))
1730 goto out;
1731 ret = 0;
1732 }
1733
1734 if (compat_set_fd_set(n, inp, fds.res_in) ||
1735 compat_set_fd_set(n, outp, fds.res_out) ||
1736 compat_set_fd_set(n, exp, fds.res_ex))
1737 ret = -EFAULT;
1738 out:
1739 if (bits != stack_fds)
1740 kfree(bits);
1741 out_nofds:
1742 return ret;
1743 }
1744
1745 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1746 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1747 struct compat_timeval __user *tvp)
1748 {
1749 struct timespec end_time, *to = NULL;
1750 struct compat_timeval tv;
1751 int ret;
1752
1753 if (tvp) {
1754 if (copy_from_user(&tv, tvp, sizeof(tv)))
1755 return -EFAULT;
1756
1757 to = &end_time;
1758 if (poll_select_set_timeout(to,
1759 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1760 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1761 return -EINVAL;
1762 }
1763
1764 ret = compat_core_sys_select(n, inp, outp, exp, to);
1765 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1766
1767 return ret;
1768 }
1769
1770 struct compat_sel_arg_struct {
1771 compat_ulong_t n;
1772 compat_uptr_t inp;
1773 compat_uptr_t outp;
1774 compat_uptr_t exp;
1775 compat_uptr_t tvp;
1776 };
1777
1778 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1779 {
1780 struct compat_sel_arg_struct a;
1781
1782 if (copy_from_user(&a, arg, sizeof(a)))
1783 return -EFAULT;
1784 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1785 compat_ptr(a.exp), compat_ptr(a.tvp));
1786 }
1787
1788 #ifdef HAVE_SET_RESTORE_SIGMASK
1789 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1790 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1791 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1792 compat_size_t sigsetsize)
1793 {
1794 compat_sigset_t ss32;
1795 sigset_t ksigmask, sigsaved;
1796 struct compat_timespec ts;
1797 struct timespec end_time, *to = NULL;
1798 int ret;
1799
1800 if (tsp) {
1801 if (copy_from_user(&ts, tsp, sizeof(ts)))
1802 return -EFAULT;
1803
1804 to = &end_time;
1805 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1806 return -EINVAL;
1807 }
1808
1809 if (sigmask) {
1810 if (sigsetsize != sizeof(compat_sigset_t))
1811 return -EINVAL;
1812 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1813 return -EFAULT;
1814 sigset_from_compat(&ksigmask, &ss32);
1815
1816 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1817 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1818 }
1819
1820 ret = compat_core_sys_select(n, inp, outp, exp, to);
1821 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1822
1823 if (ret == -ERESTARTNOHAND) {
1824 /*
1825 * Don't restore the signal mask yet. Let do_signal() deliver
1826 * the signal on the way back to userspace, before the signal
1827 * mask is restored.
1828 */
1829 if (sigmask) {
1830 memcpy(&current->saved_sigmask, &sigsaved,
1831 sizeof(sigsaved));
1832 set_restore_sigmask();
1833 }
1834 } else if (sigmask)
1835 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1836
1837 return ret;
1838 }
1839
1840 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1841 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1842 struct compat_timespec __user *tsp, void __user *sig)
1843 {
1844 compat_size_t sigsetsize = 0;
1845 compat_uptr_t up = 0;
1846
1847 if (sig) {
1848 if (!access_ok(VERIFY_READ, sig,
1849 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1850 __get_user(up, (compat_uptr_t __user *)sig) ||
1851 __get_user(sigsetsize,
1852 (compat_size_t __user *)(sig+sizeof(up))))
1853 return -EFAULT;
1854 }
1855 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1856 sigsetsize);
1857 }
1858
1859 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1860 unsigned int nfds, struct compat_timespec __user *tsp,
1861 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1862 {
1863 compat_sigset_t ss32;
1864 sigset_t ksigmask, sigsaved;
1865 struct compat_timespec ts;
1866 struct timespec end_time, *to = NULL;
1867 int ret;
1868
1869 if (tsp) {
1870 if (copy_from_user(&ts, tsp, sizeof(ts)))
1871 return -EFAULT;
1872
1873 to = &end_time;
1874 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1875 return -EINVAL;
1876 }
1877
1878 if (sigmask) {
1879 if (sigsetsize != sizeof(compat_sigset_t))
1880 return -EINVAL;
1881 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1882 return -EFAULT;
1883 sigset_from_compat(&ksigmask, &ss32);
1884
1885 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1886 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1887 }
1888
1889 ret = do_sys_poll(ufds, nfds, to);
1890
1891 /* We can restart this syscall, usually */
1892 if (ret == -EINTR) {
1893 /*
1894 * Don't restore the signal mask yet. Let do_signal() deliver
1895 * the signal on the way back to userspace, before the signal
1896 * mask is restored.
1897 */
1898 if (sigmask) {
1899 memcpy(&current->saved_sigmask, &sigsaved,
1900 sizeof(sigsaved));
1901 set_restore_sigmask();
1902 }
1903 ret = -ERESTARTNOHAND;
1904 } else if (sigmask)
1905 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1906
1907 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1908
1909 return ret;
1910 }
1911 #endif /* HAVE_SET_RESTORE_SIGMASK */
1912
1913 #if (defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)) && !defined(CONFIG_NFSD_DEPRECATED)
1914 /* Stuff for NFS server syscalls... */
1915 struct compat_nfsctl_svc {
1916 u16 svc32_port;
1917 s32 svc32_nthreads;
1918 };
1919
1920 struct compat_nfsctl_client {
1921 s8 cl32_ident[NFSCLNT_IDMAX+1];
1922 s32 cl32_naddr;
1923 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1924 s32 cl32_fhkeytype;
1925 s32 cl32_fhkeylen;
1926 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1927 };
1928
1929 struct compat_nfsctl_export {
1930 char ex32_client[NFSCLNT_IDMAX+1];
1931 char ex32_path[NFS_MAXPATHLEN+1];
1932 compat_dev_t ex32_dev;
1933 compat_ino_t ex32_ino;
1934 compat_int_t ex32_flags;
1935 __compat_uid_t ex32_anon_uid;
1936 __compat_gid_t ex32_anon_gid;
1937 };
1938
1939 struct compat_nfsctl_fdparm {
1940 struct sockaddr gd32_addr;
1941 s8 gd32_path[NFS_MAXPATHLEN+1];
1942 compat_int_t gd32_version;
1943 };
1944
1945 struct compat_nfsctl_fsparm {
1946 struct sockaddr gd32_addr;
1947 s8 gd32_path[NFS_MAXPATHLEN+1];
1948 compat_int_t gd32_maxlen;
1949 };
1950
1951 struct compat_nfsctl_arg {
1952 compat_int_t ca32_version; /* safeguard */
1953 union {
1954 struct compat_nfsctl_svc u32_svc;
1955 struct compat_nfsctl_client u32_client;
1956 struct compat_nfsctl_export u32_export;
1957 struct compat_nfsctl_fdparm u32_getfd;
1958 struct compat_nfsctl_fsparm u32_getfs;
1959 } u;
1960 #define ca32_svc u.u32_svc
1961 #define ca32_client u.u32_client
1962 #define ca32_export u.u32_export
1963 #define ca32_getfd u.u32_getfd
1964 #define ca32_getfs u.u32_getfs
1965 };
1966
1967 union compat_nfsctl_res {
1968 __u8 cr32_getfh[NFS_FHSIZE];
1969 struct knfsd_fh cr32_getfs;
1970 };
1971
1972 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1973 struct compat_nfsctl_arg __user *arg)
1974 {
1975 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1976 get_user(karg->ca_version, &arg->ca32_version) ||
1977 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1978 __get_user(karg->ca_svc.svc_nthreads,
1979 &arg->ca32_svc.svc32_nthreads))
1980 return -EFAULT;
1981 return 0;
1982 }
1983
1984 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1985 struct compat_nfsctl_arg __user *arg)
1986 {
1987 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1988 sizeof(arg->ca32_client)) ||
1989 get_user(karg->ca_version, &arg->ca32_version) ||
1990 __copy_from_user(&karg->ca_client.cl_ident[0],
1991 &arg->ca32_client.cl32_ident[0],
1992 NFSCLNT_IDMAX) ||
1993 __get_user(karg->ca_client.cl_naddr,
1994 &arg->ca32_client.cl32_naddr) ||
1995 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1996 &arg->ca32_client.cl32_addrlist[0],
1997 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1998 __get_user(karg->ca_client.cl_fhkeytype,
1999 &arg->ca32_client.cl32_fhkeytype) ||
2000 __get_user(karg->ca_client.cl_fhkeylen,
2001 &arg->ca32_client.cl32_fhkeylen) ||
2002 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2003 &arg->ca32_client.cl32_fhkey[0],
2004 NFSCLNT_KEYMAX))
2005 return -EFAULT;
2006
2007 return 0;
2008 }
2009
2010 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2011 struct compat_nfsctl_arg __user *arg)
2012 {
2013 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2014 sizeof(arg->ca32_export)) ||
2015 get_user(karg->ca_version, &arg->ca32_version) ||
2016 __copy_from_user(&karg->ca_export.ex_client[0],
2017 &arg->ca32_export.ex32_client[0],
2018 NFSCLNT_IDMAX) ||
2019 __copy_from_user(&karg->ca_export.ex_path[0],
2020 &arg->ca32_export.ex32_path[0],
2021 NFS_MAXPATHLEN) ||
2022 __get_user(karg->ca_export.ex_dev,
2023 &arg->ca32_export.ex32_dev) ||
2024 __get_user(karg->ca_export.ex_ino,
2025 &arg->ca32_export.ex32_ino) ||
2026 __get_user(karg->ca_export.ex_flags,
2027 &arg->ca32_export.ex32_flags) ||
2028 __get_user(karg->ca_export.ex_anon_uid,
2029 &arg->ca32_export.ex32_anon_uid) ||
2030 __get_user(karg->ca_export.ex_anon_gid,
2031 &arg->ca32_export.ex32_anon_gid))
2032 return -EFAULT;
2033 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2034 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2035
2036 return 0;
2037 }
2038
2039 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2040 struct compat_nfsctl_arg __user *arg)
2041 {
2042 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2043 sizeof(arg->ca32_getfd)) ||
2044 get_user(karg->ca_version, &arg->ca32_version) ||
2045 __copy_from_user(&karg->ca_getfd.gd_addr,
2046 &arg->ca32_getfd.gd32_addr,
2047 (sizeof(struct sockaddr))) ||
2048 __copy_from_user(&karg->ca_getfd.gd_path,
2049 &arg->ca32_getfd.gd32_path,
2050 (NFS_MAXPATHLEN+1)) ||
2051 __get_user(karg->ca_getfd.gd_version,
2052 &arg->ca32_getfd.gd32_version))
2053 return -EFAULT;
2054
2055 return 0;
2056 }
2057
2058 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2059 struct compat_nfsctl_arg __user *arg)
2060 {
2061 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2062 get_user(karg->ca_version, &arg->ca32_version) ||
2063 __copy_from_user(&karg->ca_getfs.gd_addr,
2064 &arg->ca32_getfs.gd32_addr,
2065 (sizeof(struct sockaddr))) ||
2066 __copy_from_user(&karg->ca_getfs.gd_path,
2067 &arg->ca32_getfs.gd32_path,
2068 (NFS_MAXPATHLEN+1)) ||
2069 __get_user(karg->ca_getfs.gd_maxlen,
2070 &arg->ca32_getfs.gd32_maxlen))
2071 return -EFAULT;
2072
2073 return 0;
2074 }
2075
2076 /* This really doesn't need translations, we are only passing
2077 * back a union which contains opaque nfs file handle data.
2078 */
2079 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2080 union compat_nfsctl_res __user *res)
2081 {
2082 int err;
2083
2084 err = copy_to_user(res, kres, sizeof(*res));
2085
2086 return (err) ? -EFAULT : 0;
2087 }
2088
2089 asmlinkage long compat_sys_nfsservctl(int cmd,
2090 struct compat_nfsctl_arg __user *arg,
2091 union compat_nfsctl_res __user *res)
2092 {
2093 struct nfsctl_arg *karg;
2094 union nfsctl_res *kres;
2095 mm_segment_t oldfs;
2096 int err;
2097
2098 karg = kmalloc(sizeof(*karg), GFP_USER);
2099 kres = kmalloc(sizeof(*kres), GFP_USER);
2100 if(!karg || !kres) {
2101 err = -ENOMEM;
2102 goto done;
2103 }
2104
2105 switch(cmd) {
2106 case NFSCTL_SVC:
2107 err = compat_nfs_svc_trans(karg, arg);
2108 break;
2109
2110 case NFSCTL_ADDCLIENT:
2111 err = compat_nfs_clnt_trans(karg, arg);
2112 break;
2113
2114 case NFSCTL_DELCLIENT:
2115 err = compat_nfs_clnt_trans(karg, arg);
2116 break;
2117
2118 case NFSCTL_EXPORT:
2119 case NFSCTL_UNEXPORT:
2120 err = compat_nfs_exp_trans(karg, arg);
2121 break;
2122
2123 case NFSCTL_GETFD:
2124 err = compat_nfs_getfd_trans(karg, arg);
2125 break;
2126
2127 case NFSCTL_GETFS:
2128 err = compat_nfs_getfs_trans(karg, arg);
2129 break;
2130
2131 default:
2132 err = -EINVAL;
2133 break;
2134 }
2135
2136 if (err)
2137 goto done;
2138
2139 oldfs = get_fs();
2140 set_fs(KERNEL_DS);
2141 /* The __user pointer casts are valid because of the set_fs() */
2142 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2143 set_fs(oldfs);
2144
2145 if (err)
2146 goto done;
2147
2148 if((cmd == NFSCTL_GETFD) ||
2149 (cmd == NFSCTL_GETFS))
2150 err = compat_nfs_getfh_res_trans(kres, res);
2151
2152 done:
2153 kfree(karg);
2154 kfree(kres);
2155 return err;
2156 }
2157 #else /* !NFSD */
2158 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2159 {
2160 return sys_ni_syscall();
2161 }
2162 #endif
2163
2164 #ifdef CONFIG_EPOLL
2165
2166 #ifdef HAVE_SET_RESTORE_SIGMASK
2167 asmlinkage long compat_sys_epoll_pwait(int epfd,
2168 struct compat_epoll_event __user *events,
2169 int maxevents, int timeout,
2170 const compat_sigset_t __user *sigmask,
2171 compat_size_t sigsetsize)
2172 {
2173 long err;
2174 compat_sigset_t csigmask;
2175 sigset_t ksigmask, sigsaved;
2176
2177 /*
2178 * If the caller wants a certain signal mask to be set during the wait,
2179 * we apply it here.
2180 */
2181 if (sigmask) {
2182 if (sigsetsize != sizeof(compat_sigset_t))
2183 return -EINVAL;
2184 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2185 return -EFAULT;
2186 sigset_from_compat(&ksigmask, &csigmask);
2187 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2188 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2189 }
2190
2191 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2192
2193 /*
2194 * If we changed the signal mask, we need to restore the original one.
2195 * In case we've got a signal while waiting, we do not restore the
2196 * signal mask yet, and we allow do_signal() to deliver the signal on
2197 * the way back to userspace, before the signal mask is restored.
2198 */
2199 if (sigmask) {
2200 if (err == -EINTR) {
2201 memcpy(&current->saved_sigmask, &sigsaved,
2202 sizeof(sigsaved));
2203 set_restore_sigmask();
2204 } else
2205 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2206 }
2207
2208 return err;
2209 }
2210 #endif /* HAVE_SET_RESTORE_SIGMASK */
2211
2212 #endif /* CONFIG_EPOLL */
2213
2214 #ifdef CONFIG_SIGNALFD
2215
2216 asmlinkage long compat_sys_signalfd4(int ufd,
2217 const compat_sigset_t __user *sigmask,
2218 compat_size_t sigsetsize, int flags)
2219 {
2220 compat_sigset_t ss32;
2221 sigset_t tmp;
2222 sigset_t __user *ksigmask;
2223
2224 if (sigsetsize != sizeof(compat_sigset_t))
2225 return -EINVAL;
2226 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2227 return -EFAULT;
2228 sigset_from_compat(&tmp, &ss32);
2229 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2230 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2231 return -EFAULT;
2232
2233 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2234 }
2235
2236 asmlinkage long compat_sys_signalfd(int ufd,
2237 const compat_sigset_t __user *sigmask,
2238 compat_size_t sigsetsize)
2239 {
2240 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2241 }
2242 #endif /* CONFIG_SIGNALFD */
2243
2244 #ifdef CONFIG_TIMERFD
2245
2246 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2247 const struct compat_itimerspec __user *utmr,
2248 struct compat_itimerspec __user *otmr)
2249 {
2250 int error;
2251 struct itimerspec t;
2252 struct itimerspec __user *ut;
2253
2254 if (get_compat_itimerspec(&t, utmr))
2255 return -EFAULT;
2256 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2257 if (copy_to_user(&ut[0], &t, sizeof(t)))
2258 return -EFAULT;
2259 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2260 if (!error && otmr)
2261 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2262 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2263
2264 return error;
2265 }
2266
2267 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2268 struct compat_itimerspec __user *otmr)
2269 {
2270 int error;
2271 struct itimerspec t;
2272 struct itimerspec __user *ut;
2273
2274 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2275 error = sys_timerfd_gettime(ufd, ut);
2276 if (!error)
2277 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2278 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2279
2280 return error;
2281 }
2282
2283 #endif /* CONFIG_TIMERFD */
2284
2285 #ifdef CONFIG_FHANDLE
2286 /*
2287 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
2288 * doesn't set the O_LARGEFILE flag.
2289 */
2290 asmlinkage long
2291 compat_sys_open_by_handle_at(int mountdirfd,
2292 struct file_handle __user *handle, int flags)
2293 {
2294 return do_handle_open(mountdirfd, handle, flags);
2295 }
2296 #endif
Linux with added FPC-III support