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revert-mm-fix-blkdev-size-calculation-in-generic_write_checks
[linux-2.6/linux-trees-mm.git] / fs / compat.c
blobe176ba1c61f616ae182006a16074db32ffb60edc
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/linkage.h>
20 #include <linux/compat.h>
21 #include <linux/errno.h>
22 #include <linux/time.h>
23 #include <linux/fs.h>
24 #include <linux/fcntl.h>
25 #include <linux/namei.h>
26 #include <linux/file.h>
27 #include <linux/vfs.h>
28 #include <linux/ioctl.h>
29 #include <linux/init.h>
30 #include <linux/smb.h>
31 #include <linux/smb_mount.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/smp_lock.h>
35 #include <linux/syscalls.h>
36 #include <linux/ctype.h>
37 #include <linux/module.h>
38 #include <linux/dirent.h>
39 #include <linux/fsnotify.h>
40 #include <linux/highuid.h>
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/syscall.h>
44 #include <linux/personality.h>
45 #include <linux/rwsem.h>
46 #include <linux/tsacct_kern.h>
47 #include <linux/security.h>
48 #include <linux/highmem.h>
49 #include <linux/signal.h>
50 #include <linux/poll.h>
51 #include <linux/mm.h>
52 #include <linux/eventpoll.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(char __user *filename, struct compat_utimbuf __user *t)
80 {
81 struct timespec tv[2];
82
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
87 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
89 }
90 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91 }
92
93 asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
94 {
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
102 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
103 && tv[0].tv_sec != 0)
104 return -EINVAL;
105 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
106 && tv[1].tv_sec != 0)
107 return -EINVAL;
108
109 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
110 return 0;
111 }
112 return do_utimes(dfd, filename, t ? tv : NULL, flags);
113 }
114
115 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
116 {
117 struct timespec tv[2];
118
119 if (t) {
120 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
121 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
122 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
123 get_user(tv[1].tv_nsec, &t[1].tv_usec))
124 return -EFAULT;
125 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
126 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
127 return -EINVAL;
128 tv[0].tv_nsec *= 1000;
129 tv[1].tv_nsec *= 1000;
130 }
131 return do_utimes(dfd, filename, t ? tv : NULL, 0);
132 }
133
134 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
135 {
136 return compat_sys_futimesat(AT_FDCWD, filename, t);
137 }
138
139 asmlinkage long compat_sys_newstat(char __user * filename,
140 struct compat_stat __user *statbuf)
141 {
142 struct kstat stat;
143 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
144
145 if (!error)
146 error = cp_compat_stat(&stat, statbuf);
147 return error;
148 }
149
150 asmlinkage long compat_sys_newlstat(char __user * filename,
151 struct compat_stat __user *statbuf)
152 {
153 struct kstat stat;
154 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
155
156 if (!error)
157 error = cp_compat_stat(&stat, statbuf);
158 return error;
159 }
160
161 #ifndef __ARCH_WANT_STAT64
162 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
163 struct compat_stat __user *statbuf, int flag)
164 {
165 struct kstat stat;
166 int error = -EINVAL;
167
168 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
169 goto out;
170
171 if (flag & AT_SYMLINK_NOFOLLOW)
172 error = vfs_lstat_fd(dfd, filename, &stat);
173 else
174 error = vfs_stat_fd(dfd, filename, &stat);
175
176 if (!error)
177 error = cp_compat_stat(&stat, statbuf);
178
179 out:
180 return error;
181 }
182 #endif
183
184 asmlinkage long compat_sys_newfstat(unsigned int fd,
185 struct compat_stat __user * statbuf)
186 {
187 struct kstat stat;
188 int error = vfs_fstat(fd, &stat);
189
190 if (!error)
191 error = cp_compat_stat(&stat, statbuf);
192 return error;
193 }
194
195 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
196 {
197
198 if (sizeof ubuf->f_blocks == 4) {
199 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
200 0xffffffff00000000ULL)
201 return -EOVERFLOW;
202 /* f_files and f_ffree may be -1; it's okay
203 * to stuff that into 32 bits */
204 if (kbuf->f_files != 0xffffffffffffffffULL
205 && (kbuf->f_files & 0xffffffff00000000ULL))
206 return -EOVERFLOW;
207 if (kbuf->f_ffree != 0xffffffffffffffffULL
208 && (kbuf->f_ffree & 0xffffffff00000000ULL))
209 return -EOVERFLOW;
210 }
211 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
212 __put_user(kbuf->f_type, &ubuf->f_type) ||
213 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
214 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
215 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
216 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
217 __put_user(kbuf->f_files, &ubuf->f_files) ||
218 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
219 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
220 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
221 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
222 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
223 __put_user(0, &ubuf->f_spare[0]) ||
224 __put_user(0, &ubuf->f_spare[1]) ||
225 __put_user(0, &ubuf->f_spare[2]) ||
226 __put_user(0, &ubuf->f_spare[3]) ||
227 __put_user(0, &ubuf->f_spare[4]))
228 return -EFAULT;
229 return 0;
230 }
231
232 /*
233 * The following statfs calls are copies of code from fs/open.c and
234 * should be checked against those from time to time
235 */
236 asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
237 {
238 struct nameidata nd;
239 int error;
240
241 error = user_path_walk(path, &nd);
242 if (!error) {
243 struct kstatfs tmp;
244 error = vfs_statfs(nd.path.dentry, &tmp);
245 if (!error)
246 error = put_compat_statfs(buf, &tmp);
247 path_put(&nd.path);
248 }
249 return error;
250 }
251
252 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
253 {
254 struct file * file;
255 struct kstatfs tmp;
256 int error;
257
258 error = -EBADF;
259 file = fget(fd);
260 if (!file)
261 goto out;
262 error = vfs_statfs(file->f_path.dentry, &tmp);
263 if (!error)
264 error = put_compat_statfs(buf, &tmp);
265 fput(file);
266 out:
267 return error;
268 }
269
270 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
271 {
272 if (sizeof ubuf->f_blocks == 4) {
273 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
274 0xffffffff00000000ULL)
275 return -EOVERFLOW;
276 /* f_files and f_ffree may be -1; it's okay
277 * to stuff that into 32 bits */
278 if (kbuf->f_files != 0xffffffffffffffffULL
279 && (kbuf->f_files & 0xffffffff00000000ULL))
280 return -EOVERFLOW;
281 if (kbuf->f_ffree != 0xffffffffffffffffULL
282 && (kbuf->f_ffree & 0xffffffff00000000ULL))
283 return -EOVERFLOW;
284 }
285 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
286 __put_user(kbuf->f_type, &ubuf->f_type) ||
287 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
288 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
289 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
290 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
291 __put_user(kbuf->f_files, &ubuf->f_files) ||
292 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
293 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
294 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
295 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
296 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
297 return -EFAULT;
298 return 0;
299 }
300
301 asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
302 {
303 struct nameidata nd;
304 int error;
305
306 if (sz != sizeof(*buf))
307 return -EINVAL;
308
309 error = user_path_walk(path, &nd);
310 if (!error) {
311 struct kstatfs tmp;
312 error = vfs_statfs(nd.path.dentry, &tmp);
313 if (!error)
314 error = put_compat_statfs64(buf, &tmp);
315 path_put(&nd.path);
316 }
317 return error;
318 }
319
320 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
321 {
322 struct file * file;
323 struct kstatfs tmp;
324 int error;
325
326 if (sz != sizeof(*buf))
327 return -EINVAL;
328
329 error = -EBADF;
330 file = fget(fd);
331 if (!file)
332 goto out;
333 error = vfs_statfs(file->f_path.dentry, &tmp);
334 if (!error)
335 error = put_compat_statfs64(buf, &tmp);
336 fput(file);
337 out:
338 return error;
339 }
340
341 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
342 {
343 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
344 __get_user(kfl->l_type, &ufl->l_type) ||
345 __get_user(kfl->l_whence, &ufl->l_whence) ||
346 __get_user(kfl->l_start, &ufl->l_start) ||
347 __get_user(kfl->l_len, &ufl->l_len) ||
348 __get_user(kfl->l_pid, &ufl->l_pid))
349 return -EFAULT;
350 return 0;
351 }
352
353 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
354 {
355 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
356 __put_user(kfl->l_type, &ufl->l_type) ||
357 __put_user(kfl->l_whence, &ufl->l_whence) ||
358 __put_user(kfl->l_start, &ufl->l_start) ||
359 __put_user(kfl->l_len, &ufl->l_len) ||
360 __put_user(kfl->l_pid, &ufl->l_pid))
361 return -EFAULT;
362 return 0;
363 }
364
365 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
366 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
367 {
368 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
369 __get_user(kfl->l_type, &ufl->l_type) ||
370 __get_user(kfl->l_whence, &ufl->l_whence) ||
371 __get_user(kfl->l_start, &ufl->l_start) ||
372 __get_user(kfl->l_len, &ufl->l_len) ||
373 __get_user(kfl->l_pid, &ufl->l_pid))
374 return -EFAULT;
375 return 0;
376 }
377 #endif
378
379 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
380 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
381 {
382 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
383 __put_user(kfl->l_type, &ufl->l_type) ||
384 __put_user(kfl->l_whence, &ufl->l_whence) ||
385 __put_user(kfl->l_start, &ufl->l_start) ||
386 __put_user(kfl->l_len, &ufl->l_len) ||
387 __put_user(kfl->l_pid, &ufl->l_pid))
388 return -EFAULT;
389 return 0;
390 }
391 #endif
392
393 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
394 unsigned long arg)
395 {
396 mm_segment_t old_fs;
397 struct flock f;
398 long ret;
399
400 switch (cmd) {
401 case F_GETLK:
402 case F_SETLK:
403 case F_SETLKW:
404 ret = get_compat_flock(&f, compat_ptr(arg));
405 if (ret != 0)
406 break;
407 old_fs = get_fs();
408 set_fs(KERNEL_DS);
409 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
410 set_fs(old_fs);
411 if (cmd == F_GETLK && ret == 0) {
412 /* GETLK was successfule and we need to return the data...
413 * but it needs to fit in the compat structure.
414 * l_start shouldn't be too big, unless the original
415 * start + end is greater than COMPAT_OFF_T_MAX, in which
416 * case the app was asking for trouble, so we return
417 * -EOVERFLOW in that case.
418 * l_len could be too big, in which case we just truncate it,
419 * and only allow the app to see that part of the conflicting
420 * lock that might make sense to it anyway
421 */
422
423 if (f.l_start > COMPAT_OFF_T_MAX)
424 ret = -EOVERFLOW;
425 if (f.l_len > COMPAT_OFF_T_MAX)
426 f.l_len = COMPAT_OFF_T_MAX;
427 if (ret == 0)
428 ret = put_compat_flock(&f, compat_ptr(arg));
429 }
430 break;
431
432 case F_GETLK64:
433 case F_SETLK64:
434 case F_SETLKW64:
435 ret = get_compat_flock64(&f, compat_ptr(arg));
436 if (ret != 0)
437 break;
438 old_fs = get_fs();
439 set_fs(KERNEL_DS);
440 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
441 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
442 (unsigned long)&f);
443 set_fs(old_fs);
444 if (cmd == F_GETLK64 && ret == 0) {
445 /* need to return lock information - see above for commentary */
446 if (f.l_start > COMPAT_LOFF_T_MAX)
447 ret = -EOVERFLOW;
448 if (f.l_len > COMPAT_LOFF_T_MAX)
449 f.l_len = COMPAT_LOFF_T_MAX;
450 if (ret == 0)
451 ret = put_compat_flock64(&f, compat_ptr(arg));
452 }
453 break;
454
455 default:
456 ret = sys_fcntl(fd, cmd, arg);
457 break;
458 }
459 return ret;
460 }
461
462 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
463 unsigned long arg)
464 {
465 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
466 return -EINVAL;
467 return compat_sys_fcntl64(fd, cmd, arg);
468 }
469
470 asmlinkage long
471 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
472 {
473 long ret;
474 aio_context_t ctx64;
475
476 mm_segment_t oldfs = get_fs();
477 if (unlikely(get_user(ctx64, ctx32p)))
478 return -EFAULT;
479
480 set_fs(KERNEL_DS);
481 /* The __user pointer cast is valid because of the set_fs() */
482 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
483 set_fs(oldfs);
484 /* truncating is ok because it's a user address */
485 if (!ret)
486 ret = put_user((u32) ctx64, ctx32p);
487 return ret;
488 }
489
490 asmlinkage long
491 compat_sys_io_getevents(aio_context_t ctx_id,
492 unsigned long min_nr,
493 unsigned long nr,
494 struct io_event __user *events,
495 struct compat_timespec __user *timeout)
496 {
497 long ret;
498 struct timespec t;
499 struct timespec __user *ut = NULL;
500
501 ret = -EFAULT;
502 if (unlikely(!access_ok(VERIFY_WRITE, events,
503 nr * sizeof(struct io_event))))
504 goto out;
505 if (timeout) {
506 if (get_compat_timespec(&t, timeout))
507 goto out;
508
509 ut = compat_alloc_user_space(sizeof(*ut));
510 if (copy_to_user(ut, &t, sizeof(t)) )
511 goto out;
512 }
513 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
514 out:
515 return ret;
516 }
517
518 static inline long
519 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
520 {
521 compat_uptr_t uptr;
522 int i;
523
524 for (i = 0; i < nr; ++i) {
525 if (get_user(uptr, ptr32 + i))
526 return -EFAULT;
527 if (put_user(compat_ptr(uptr), ptr64 + i))
528 return -EFAULT;
529 }
530 return 0;
531 }
532
533 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
534
535 asmlinkage long
536 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
537 {
538 struct iocb __user * __user *iocb64;
539 long ret;
540
541 if (unlikely(nr < 0))
542 return -EINVAL;
543
544 if (nr > MAX_AIO_SUBMITS)
545 nr = MAX_AIO_SUBMITS;
546
547 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
548 ret = copy_iocb(nr, iocb, iocb64);
549 if (!ret)
550 ret = sys_io_submit(ctx_id, nr, iocb64);
551 return ret;
552 }
553
554 struct compat_ncp_mount_data {
555 compat_int_t version;
556 compat_uint_t ncp_fd;
557 __compat_uid_t mounted_uid;
558 compat_pid_t wdog_pid;
559 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
560 compat_uint_t time_out;
561 compat_uint_t retry_count;
562 compat_uint_t flags;
563 __compat_uid_t uid;
564 __compat_gid_t gid;
565 compat_mode_t file_mode;
566 compat_mode_t dir_mode;
567 };
568
569 struct compat_ncp_mount_data_v4 {
570 compat_int_t version;
571 compat_ulong_t flags;
572 compat_ulong_t mounted_uid;
573 compat_long_t wdog_pid;
574 compat_uint_t ncp_fd;
575 compat_uint_t time_out;
576 compat_uint_t retry_count;
577 compat_ulong_t uid;
578 compat_ulong_t gid;
579 compat_ulong_t file_mode;
580 compat_ulong_t dir_mode;
581 };
582
583 static void *do_ncp_super_data_conv(void *raw_data)
584 {
585 int version = *(unsigned int *)raw_data;
586
587 if (version == 3) {
588 struct compat_ncp_mount_data *c_n = raw_data;
589 struct ncp_mount_data *n = raw_data;
590
591 n->dir_mode = c_n->dir_mode;
592 n->file_mode = c_n->file_mode;
593 n->gid = c_n->gid;
594 n->uid = c_n->uid;
595 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
596 n->wdog_pid = c_n->wdog_pid;
597 n->mounted_uid = c_n->mounted_uid;
598 } else if (version == 4) {
599 struct compat_ncp_mount_data_v4 *c_n = raw_data;
600 struct ncp_mount_data_v4 *n = raw_data;
601
602 n->dir_mode = c_n->dir_mode;
603 n->file_mode = c_n->file_mode;
604 n->gid = c_n->gid;
605 n->uid = c_n->uid;
606 n->retry_count = c_n->retry_count;
607 n->time_out = c_n->time_out;
608 n->ncp_fd = c_n->ncp_fd;
609 n->wdog_pid = c_n->wdog_pid;
610 n->mounted_uid = c_n->mounted_uid;
611 n->flags = c_n->flags;
612 } else if (version != 5) {
613 return NULL;
614 }
615
616 return raw_data;
617 }
618
619 struct compat_smb_mount_data {
620 compat_int_t version;
621 __compat_uid_t mounted_uid;
622 __compat_uid_t uid;
623 __compat_gid_t gid;
624 compat_mode_t file_mode;
625 compat_mode_t dir_mode;
626 };
627
628 static void *do_smb_super_data_conv(void *raw_data)
629 {
630 struct smb_mount_data *s = raw_data;
631 struct compat_smb_mount_data *c_s = raw_data;
632
633 if (c_s->version != SMB_MOUNT_OLDVERSION)
634 goto out;
635 s->dir_mode = c_s->dir_mode;
636 s->file_mode = c_s->file_mode;
637 s->gid = c_s->gid;
638 s->uid = c_s->uid;
639 s->mounted_uid = c_s->mounted_uid;
640 out:
641 return raw_data;
642 }
643
644 struct compat_nfs_string {
645 compat_uint_t len;
646 compat_uptr_t data;
647 };
648
649 static inline void compat_nfs_string(struct nfs_string *dst,
650 struct compat_nfs_string *src)
651 {
652 dst->data = compat_ptr(src->data);
653 dst->len = src->len;
654 }
655
656 struct compat_nfs4_mount_data_v1 {
657 compat_int_t version;
658 compat_int_t flags;
659 compat_int_t rsize;
660 compat_int_t wsize;
661 compat_int_t timeo;
662 compat_int_t retrans;
663 compat_int_t acregmin;
664 compat_int_t acregmax;
665 compat_int_t acdirmin;
666 compat_int_t acdirmax;
667 struct compat_nfs_string client_addr;
668 struct compat_nfs_string mnt_path;
669 struct compat_nfs_string hostname;
670 compat_uint_t host_addrlen;
671 compat_uptr_t host_addr;
672 compat_int_t proto;
673 compat_int_t auth_flavourlen;
674 compat_uptr_t auth_flavours;
675 };
676
677 static int do_nfs4_super_data_conv(void *raw_data)
678 {
679 int version = *(compat_uint_t *) raw_data;
680
681 if (version == 1) {
682 struct compat_nfs4_mount_data_v1 *raw = raw_data;
683 struct nfs4_mount_data *real = raw_data;
684
685 /* copy the fields backwards */
686 real->auth_flavours = compat_ptr(raw->auth_flavours);
687 real->auth_flavourlen = raw->auth_flavourlen;
688 real->proto = raw->proto;
689 real->host_addr = compat_ptr(raw->host_addr);
690 real->host_addrlen = raw->host_addrlen;
691 compat_nfs_string(&real->hostname, &raw->hostname);
692 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
693 compat_nfs_string(&real->client_addr, &raw->client_addr);
694 real->acdirmax = raw->acdirmax;
695 real->acdirmin = raw->acdirmin;
696 real->acregmax = raw->acregmax;
697 real->acregmin = raw->acregmin;
698 real->retrans = raw->retrans;
699 real->timeo = raw->timeo;
700 real->wsize = raw->wsize;
701 real->rsize = raw->rsize;
702 real->flags = raw->flags;
703 real->version = raw->version;
704 }
705 else {
706 return -EINVAL;
707 }
708
709 return 0;
710 }
711
712 #define SMBFS_NAME "smbfs"
713 #define NCPFS_NAME "ncpfs"
714 #define NFS4_NAME "nfs4"
715
716 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
717 char __user * type, unsigned long flags,
718 void __user * data)
719 {
720 unsigned long type_page;
721 unsigned long data_page;
722 unsigned long dev_page;
723 char *dir_page;
724 int retval;
725
726 retval = copy_mount_options (type, &type_page);
727 if (retval < 0)
728 goto out;
729
730 dir_page = getname(dir_name);
731 retval = PTR_ERR(dir_page);
732 if (IS_ERR(dir_page))
733 goto out1;
734
735 retval = copy_mount_options (dev_name, &dev_page);
736 if (retval < 0)
737 goto out2;
738
739 retval = copy_mount_options (data, &data_page);
740 if (retval < 0)
741 goto out3;
742
743 retval = -EINVAL;
744
745 if (type_page && data_page) {
746 if (!strcmp((char *)type_page, SMBFS_NAME)) {
747 do_smb_super_data_conv((void *)data_page);
748 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
749 do_ncp_super_data_conv((void *)data_page);
750 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
751 if (do_nfs4_super_data_conv((void *) data_page))
752 goto out4;
753 }
754 }
755
756 lock_kernel();
757 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
758 flags, (void*)data_page);
759 unlock_kernel();
760
761 out4:
762 free_page(data_page);
763 out3:
764 free_page(dev_page);
765 out2:
766 putname(dir_page);
767 out1:
768 free_page(type_page);
769 out:
770 return retval;
771 }
772
773 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
774
775 struct compat_old_linux_dirent {
776 compat_ulong_t d_ino;
777 compat_ulong_t d_offset;
778 unsigned short d_namlen;
779 char d_name[1];
780 };
781
782 struct compat_readdir_callback {
783 struct compat_old_linux_dirent __user *dirent;
784 int result;
785 };
786
787 static int compat_fillonedir(void *__buf, const char *name, int namlen,
788 loff_t offset, u64 ino, unsigned int d_type)
789 {
790 struct compat_readdir_callback *buf = __buf;
791 struct compat_old_linux_dirent __user *dirent;
792 compat_ulong_t d_ino;
793
794 if (buf->result)
795 return -EINVAL;
796 d_ino = ino;
797 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
798 return -EOVERFLOW;
799 buf->result++;
800 dirent = buf->dirent;
801 if (!access_ok(VERIFY_WRITE, dirent,
802 (unsigned long)(dirent->d_name + namlen + 1) -
803 (unsigned long)dirent))
804 goto efault;
805 if ( __put_user(d_ino, &dirent->d_ino) ||
806 __put_user(offset, &dirent->d_offset) ||
807 __put_user(namlen, &dirent->d_namlen) ||
808 __copy_to_user(dirent->d_name, name, namlen) ||
809 __put_user(0, dirent->d_name + namlen))
810 goto efault;
811 return 0;
812 efault:
813 buf->result = -EFAULT;
814 return -EFAULT;
815 }
816
817 asmlinkage long compat_sys_old_readdir(unsigned int fd,
818 struct compat_old_linux_dirent __user *dirent, unsigned int count)
819 {
820 int error;
821 struct file *file;
822 struct compat_readdir_callback buf;
823
824 error = -EBADF;
825 file = fget(fd);
826 if (!file)
827 goto out;
828
829 buf.result = 0;
830 buf.dirent = dirent;
831
832 error = vfs_readdir(file, compat_fillonedir, &buf);
833 if (error >= 0)
834 error = buf.result;
835
836 fput(file);
837 out:
838 return error;
839 }
840
841 struct compat_linux_dirent {
842 compat_ulong_t d_ino;
843 compat_ulong_t d_off;
844 unsigned short d_reclen;
845 char d_name[1];
846 };
847
848 struct compat_getdents_callback {
849 struct compat_linux_dirent __user *current_dir;
850 struct compat_linux_dirent __user *previous;
851 int count;
852 int error;
853 };
854
855 static int compat_filldir(void *__buf, const char *name, int namlen,
856 loff_t offset, u64 ino, unsigned int d_type)
857 {
858 struct compat_linux_dirent __user * dirent;
859 struct compat_getdents_callback *buf = __buf;
860 compat_ulong_t d_ino;
861 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
862
863 buf->error = -EINVAL; /* only used if we fail.. */
864 if (reclen > buf->count)
865 return -EINVAL;
866 d_ino = ino;
867 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
868 return -EOVERFLOW;
869 dirent = buf->previous;
870 if (dirent) {
871 if (__put_user(offset, &dirent->d_off))
872 goto efault;
873 }
874 dirent = buf->current_dir;
875 if (__put_user(d_ino, &dirent->d_ino))
876 goto efault;
877 if (__put_user(reclen, &dirent->d_reclen))
878 goto efault;
879 if (copy_to_user(dirent->d_name, name, namlen))
880 goto efault;
881 if (__put_user(0, dirent->d_name + namlen))
882 goto efault;
883 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
884 goto efault;
885 buf->previous = dirent;
886 dirent = (void __user *)dirent + reclen;
887 buf->current_dir = dirent;
888 buf->count -= reclen;
889 return 0;
890 efault:
891 buf->error = -EFAULT;
892 return -EFAULT;
893 }
894
895 asmlinkage long compat_sys_getdents(unsigned int fd,
896 struct compat_linux_dirent __user *dirent, unsigned int count)
897 {
898 struct file * file;
899 struct compat_linux_dirent __user * lastdirent;
900 struct compat_getdents_callback buf;
901 int error;
902
903 error = -EFAULT;
904 if (!access_ok(VERIFY_WRITE, dirent, count))
905 goto out;
906
907 error = -EBADF;
908 file = fget(fd);
909 if (!file)
910 goto out;
911
912 buf.current_dir = dirent;
913 buf.previous = NULL;
914 buf.count = count;
915 buf.error = 0;
916
917 error = vfs_readdir(file, compat_filldir, &buf);
918 if (error < 0)
919 goto out_putf;
920 error = buf.error;
921 lastdirent = buf.previous;
922 if (lastdirent) {
923 if (put_user(file->f_pos, &lastdirent->d_off))
924 error = -EFAULT;
925 else
926 error = count - buf.count;
927 }
928
929 out_putf:
930 fput(file);
931 out:
932 return error;
933 }
934
935 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
936
937 struct compat_getdents_callback64 {
938 struct linux_dirent64 __user *current_dir;
939 struct linux_dirent64 __user *previous;
940 int count;
941 int error;
942 };
943
944 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
945 u64 ino, unsigned int d_type)
946 {
947 struct linux_dirent64 __user *dirent;
948 struct compat_getdents_callback64 *buf = __buf;
949 int jj = NAME_OFFSET(dirent);
950 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
951 u64 off;
952
953 buf->error = -EINVAL; /* only used if we fail.. */
954 if (reclen > buf->count)
955 return -EINVAL;
956 dirent = buf->previous;
957
958 if (dirent) {
959 if (__put_user_unaligned(offset, &dirent->d_off))
960 goto efault;
961 }
962 dirent = buf->current_dir;
963 if (__put_user_unaligned(ino, &dirent->d_ino))
964 goto efault;
965 off = 0;
966 if (__put_user_unaligned(off, &dirent->d_off))
967 goto efault;
968 if (__put_user(reclen, &dirent->d_reclen))
969 goto efault;
970 if (__put_user(d_type, &dirent->d_type))
971 goto efault;
972 if (copy_to_user(dirent->d_name, name, namlen))
973 goto efault;
974 if (__put_user(0, dirent->d_name + namlen))
975 goto efault;
976 buf->previous = dirent;
977 dirent = (void __user *)dirent + reclen;
978 buf->current_dir = dirent;
979 buf->count -= reclen;
980 return 0;
981 efault:
982 buf->error = -EFAULT;
983 return -EFAULT;
984 }
985
986 asmlinkage long compat_sys_getdents64(unsigned int fd,
987 struct linux_dirent64 __user * dirent, unsigned int count)
988 {
989 struct file * file;
990 struct linux_dirent64 __user * lastdirent;
991 struct compat_getdents_callback64 buf;
992 int error;
993
994 error = -EFAULT;
995 if (!access_ok(VERIFY_WRITE, dirent, count))
996 goto out;
997
998 error = -EBADF;
999 file = fget(fd);
1000 if (!file)
1001 goto out;
1002
1003 buf.current_dir = dirent;
1004 buf.previous = NULL;
1005 buf.count = count;
1006 buf.error = 0;
1007
1008 error = vfs_readdir(file, compat_filldir64, &buf);
1009 if (error < 0)
1010 goto out_putf;
1011 error = buf.error;
1012 lastdirent = buf.previous;
1013 if (lastdirent) {
1014 typeof(lastdirent->d_off) d_off = file->f_pos;
1015 error = -EFAULT;
1016 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1017 goto out_putf;
1018 error = count - buf.count;
1019 }
1020
1021 out_putf:
1022 fput(file);
1023 out:
1024 return error;
1025 }
1026 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1027
1028 static ssize_t compat_do_readv_writev(int type, struct file *file,
1029 const struct compat_iovec __user *uvector,
1030 unsigned long nr_segs, loff_t *pos)
1031 {
1032 compat_ssize_t tot_len;
1033 struct iovec iovstack[UIO_FASTIOV];
1034 struct iovec *iov=iovstack, *vector;
1035 ssize_t ret;
1036 int seg;
1037 io_fn_t fn;
1038 iov_fn_t fnv;
1039
1040 /*
1041 * SuS says "The readv() function *may* fail if the iovcnt argument
1042 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1043 * traditionally returned zero for zero segments, so...
1044 */
1045 ret = 0;
1046 if (nr_segs == 0)
1047 goto out;
1048
1049 /*
1050 * First get the "struct iovec" from user memory and
1051 * verify all the pointers
1052 */
1053 ret = -EINVAL;
1054 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1055 goto out;
1056 if (!file->f_op)
1057 goto out;
1058 if (nr_segs > UIO_FASTIOV) {
1059 ret = -ENOMEM;
1060 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1061 if (!iov)
1062 goto out;
1063 }
1064 ret = -EFAULT;
1065 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1066 goto out;
1067
1068 /*
1069 * Single unix specification:
1070 * We should -EINVAL if an element length is not >= 0 and fitting an
1071 * ssize_t. The total length is fitting an ssize_t
1072 *
1073 * Be careful here because iov_len is a size_t not an ssize_t
1074 */
1075 tot_len = 0;
1076 vector = iov;
1077 ret = -EINVAL;
1078 for (seg = 0 ; seg < nr_segs; seg++) {
1079 compat_ssize_t tmp = tot_len;
1080 compat_ssize_t len;
1081 compat_uptr_t buf;
1082
1083 if (__get_user(len, &uvector->iov_len) ||
1084 __get_user(buf, &uvector->iov_base)) {
1085 ret = -EFAULT;
1086 goto out;
1087 }
1088 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1089 goto out;
1090 tot_len += len;
1091 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1092 goto out;
1093 vector->iov_base = compat_ptr(buf);
1094 vector->iov_len = (compat_size_t) len;
1095 uvector++;
1096 vector++;
1097 }
1098 if (tot_len == 0) {
1099 ret = 0;
1100 goto out;
1101 }
1102
1103 ret = rw_verify_area(type, file, pos, tot_len);
1104 if (ret < 0)
1105 goto out;
1106
1107 ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
1108 if (ret)
1109 goto out;
1110
1111 fnv = NULL;
1112 if (type == READ) {
1113 fn = file->f_op->read;
1114 fnv = file->f_op->aio_read;
1115 } else {
1116 fn = (io_fn_t)file->f_op->write;
1117 fnv = file->f_op->aio_write;
1118 }
1119
1120 if (fnv)
1121 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1122 pos, fnv);
1123 else
1124 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1125
1126 out:
1127 if (iov != iovstack)
1128 kfree(iov);
1129 if ((ret + (type == READ)) > 0) {
1130 struct dentry *dentry = file->f_path.dentry;
1131 if (type == READ)
1132 fsnotify_access(dentry);
1133 else
1134 fsnotify_modify(dentry);
1135 }
1136 return ret;
1137 }
1138
1139 asmlinkage ssize_t
1140 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1141 {
1142 struct file *file;
1143 ssize_t ret = -EBADF;
1144
1145 file = fget(fd);
1146 if (!file)
1147 return -EBADF;
1148
1149 if (!(file->f_mode & FMODE_READ))
1150 goto out;
1151
1152 ret = -EINVAL;
1153 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1154 goto out;
1155
1156 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1157
1158 out:
1159 fput(file);
1160 return ret;
1161 }
1162
1163 asmlinkage ssize_t
1164 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1165 {
1166 struct file *file;
1167 ssize_t ret = -EBADF;
1168
1169 file = fget(fd);
1170 if (!file)
1171 return -EBADF;
1172 if (!(file->f_mode & FMODE_WRITE))
1173 goto out;
1174
1175 ret = -EINVAL;
1176 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1177 goto out;
1178
1179 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1180
1181 out:
1182 fput(file);
1183 return ret;
1184 }
1185
1186 asmlinkage long
1187 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1188 unsigned int nr_segs, unsigned int flags)
1189 {
1190 unsigned i;
1191 struct iovec __user *iov;
1192 if (nr_segs > UIO_MAXIOV)
1193 return -EINVAL;
1194 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1195 for (i = 0; i < nr_segs; i++) {
1196 struct compat_iovec v;
1197 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1198 get_user(v.iov_len, &iov32[i].iov_len) ||
1199 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1200 put_user(v.iov_len, &iov[i].iov_len))
1201 return -EFAULT;
1202 }
1203 return sys_vmsplice(fd, iov, nr_segs, flags);
1204 }
1205
1206 /*
1207 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1208 * O_LARGEFILE flag.
1209 */
1210 asmlinkage long
1211 compat_sys_open(const char __user *filename, int flags, int mode)
1212 {
1213 return do_sys_open(AT_FDCWD, filename, flags, mode);
1214 }
1215
1216 /*
1217 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1218 * O_LARGEFILE flag.
1219 */
1220 asmlinkage long
1221 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1222 {
1223 return do_sys_open(dfd, filename, flags, mode);
1224 }
1225
1226 /*
1227 * compat_count() counts the number of arguments/envelopes. It is basically
1228 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1229 * and envp pointers.
1230 */
1231 static int compat_count(compat_uptr_t __user *argv, int max)
1232 {
1233 int i = 0;
1234
1235 if (argv != NULL) {
1236 for (;;) {
1237 compat_uptr_t p;
1238
1239 if (get_user(p, argv))
1240 return -EFAULT;
1241 if (!p)
1242 break;
1243 argv++;
1244 if(++i > max)
1245 return -E2BIG;
1246 }
1247 }
1248 return i;
1249 }
1250
1251 /*
1252 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1253 * except that it works with 32 bit argv and envp pointers.
1254 */
1255 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1256 struct linux_binprm *bprm)
1257 {
1258 struct page *kmapped_page = NULL;
1259 char *kaddr = NULL;
1260 unsigned long kpos = 0;
1261 int ret;
1262
1263 while (argc-- > 0) {
1264 compat_uptr_t str;
1265 int len;
1266 unsigned long pos;
1267
1268 if (get_user(str, argv+argc) ||
1269 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1270 ret = -EFAULT;
1271 goto out;
1272 }
1273
1274 if (len > MAX_ARG_STRLEN) {
1275 ret = -E2BIG;
1276 goto out;
1277 }
1278
1279 /* We're going to work our way backwords. */
1280 pos = bprm->p;
1281 str += len;
1282 bprm->p -= len;
1283
1284 while (len > 0) {
1285 int offset, bytes_to_copy;
1286
1287 offset = pos % PAGE_SIZE;
1288 if (offset == 0)
1289 offset = PAGE_SIZE;
1290
1291 bytes_to_copy = offset;
1292 if (bytes_to_copy > len)
1293 bytes_to_copy = len;
1294
1295 offset -= bytes_to_copy;
1296 pos -= bytes_to_copy;
1297 str -= bytes_to_copy;
1298 len -= bytes_to_copy;
1299
1300 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1301 struct page *page;
1302
1303 #ifdef CONFIG_STACK_GROWSUP
1304 ret = expand_stack_downwards(bprm->vma, pos);
1305 if (ret < 0) {
1306 /* We've exceed the stack rlimit. */
1307 ret = -E2BIG;
1308 goto out;
1309 }
1310 #endif
1311 ret = get_user_pages(current, bprm->mm, pos,
1312 1, 1, 1, &page, NULL);
1313 if (ret <= 0) {
1314 /* We've exceed the stack rlimit. */
1315 ret = -E2BIG;
1316 goto out;
1317 }
1318
1319 if (kmapped_page) {
1320 flush_kernel_dcache_page(kmapped_page);
1321 kunmap(kmapped_page);
1322 put_page(kmapped_page);
1323 }
1324 kmapped_page = page;
1325 kaddr = kmap(kmapped_page);
1326 kpos = pos & PAGE_MASK;
1327 flush_cache_page(bprm->vma, kpos,
1328 page_to_pfn(kmapped_page));
1329 }
1330 if (copy_from_user(kaddr+offset, compat_ptr(str),
1331 bytes_to_copy)) {
1332 ret = -EFAULT;
1333 goto out;
1334 }
1335 }
1336 }
1337 ret = 0;
1338 out:
1339 if (kmapped_page) {
1340 flush_kernel_dcache_page(kmapped_page);
1341 kunmap(kmapped_page);
1342 put_page(kmapped_page);
1343 }
1344 return ret;
1345 }
1346
1347 /*
1348 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1349 * that it processes 32 bit argv and envp pointers.
1350 */
1351 int compat_do_execve(char * filename,
1352 compat_uptr_t __user *argv,
1353 compat_uptr_t __user *envp,
1354 struct pt_regs * regs)
1355 {
1356 struct linux_binprm *bprm;
1357 struct file *file;
1358 int retval;
1359
1360 retval = -ENOMEM;
1361 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1362 if (!bprm)
1363 goto out_ret;
1364
1365 file = open_exec(filename);
1366 retval = PTR_ERR(file);
1367 if (IS_ERR(file))
1368 goto out_kfree;
1369
1370 sched_exec();
1371
1372 bprm->file = file;
1373 bprm->filename = filename;
1374 bprm->interp = filename;
1375
1376 retval = bprm_mm_init(bprm);
1377 if (retval)
1378 goto out_file;
1379
1380 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1381 if ((retval = bprm->argc) < 0)
1382 goto out_mm;
1383
1384 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1385 if ((retval = bprm->envc) < 0)
1386 goto out_mm;
1387
1388 retval = security_bprm_alloc(bprm);
1389 if (retval)
1390 goto out;
1391
1392 retval = prepare_binprm(bprm);
1393 if (retval < 0)
1394 goto out;
1395
1396 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1397 if (retval < 0)
1398 goto out;
1399
1400 bprm->exec = bprm->p;
1401 retval = compat_copy_strings(bprm->envc, envp, bprm);
1402 if (retval < 0)
1403 goto out;
1404
1405 retval = compat_copy_strings(bprm->argc, argv, bprm);
1406 if (retval < 0)
1407 goto out;
1408
1409 retval = search_binary_handler(bprm, regs);
1410 if (retval >= 0) {
1411 /* execve success */
1412 security_bprm_free(bprm);
1413 acct_update_integrals(current);
1414 kfree(bprm);
1415 return retval;
1416 }
1417
1418 out:
1419 if (bprm->security)
1420 security_bprm_free(bprm);
1421
1422 out_mm:
1423 if (bprm->mm)
1424 mmput(bprm->mm);
1425
1426 out_file:
1427 if (bprm->file) {
1428 allow_write_access(bprm->file);
1429 fput(bprm->file);
1430 }
1431
1432 out_kfree:
1433 kfree(bprm);
1434
1435 out_ret:
1436 return retval;
1437 }
1438
1439 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1440
1441 /*
1442 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1443 * 64-bit unsigned longs.
1444 */
1445 static
1446 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1447 unsigned long *fdset)
1448 {
1449 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1450 if (ufdset) {
1451 unsigned long odd;
1452
1453 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1454 return -EFAULT;
1455
1456 odd = nr & 1UL;
1457 nr &= ~1UL;
1458 while (nr) {
1459 unsigned long h, l;
1460 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1461 return -EFAULT;
1462 ufdset += 2;
1463 *fdset++ = h << 32 | l;
1464 nr -= 2;
1465 }
1466 if (odd && __get_user(*fdset, ufdset))
1467 return -EFAULT;
1468 } else {
1469 /* Tricky, must clear full unsigned long in the
1470 * kernel fdset at the end, this makes sure that
1471 * actually happens.
1472 */
1473 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1474 }
1475 return 0;
1476 }
1477
1478 static
1479 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1480 unsigned long *fdset)
1481 {
1482 unsigned long odd;
1483 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1484
1485 if (!ufdset)
1486 return 0;
1487
1488 odd = nr & 1UL;
1489 nr &= ~1UL;
1490 while (nr) {
1491 unsigned long h, l;
1492 l = *fdset++;
1493 h = l >> 32;
1494 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1495 return -EFAULT;
1496 ufdset += 2;
1497 nr -= 2;
1498 }
1499 if (odd && __put_user(*fdset, ufdset))
1500 return -EFAULT;
1501 return 0;
1502 }
1503
1504
1505 /*
1506 * This is a virtual copy of sys_select from fs/select.c and probably
1507 * should be compared to it from time to time
1508 */
1509
1510 /*
1511 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1512 * like to be certain this leads to no problems. So I return
1513 * EINTR just for safety.
1514 *
1515 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1516 * I'm trying ERESTARTNOHAND which restart only when you want to.
1517 */
1518 #define MAX_SELECT_SECONDS \
1519 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1520
1521 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1522 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1523 {
1524 fd_set_bits fds;
1525 void *bits;
1526 int size, max_fds, ret = -EINVAL;
1527 struct fdtable *fdt;
1528 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1529
1530 if (n < 0)
1531 goto out_nofds;
1532
1533 /* max_fds can increase, so grab it once to avoid race */
1534 rcu_read_lock();
1535 fdt = files_fdtable(current->files);
1536 max_fds = fdt->max_fds;
1537 rcu_read_unlock();
1538 if (n > max_fds)
1539 n = max_fds;
1540
1541 /*
1542 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1543 * since we used fdset we need to allocate memory in units of
1544 * long-words.
1545 */
1546 size = FDS_BYTES(n);
1547 bits = stack_fds;
1548 if (size > sizeof(stack_fds) / 6) {
1549 bits = kmalloc(6 * size, GFP_KERNEL);
1550 ret = -ENOMEM;
1551 if (!bits)
1552 goto out_nofds;
1553 }
1554 fds.in = (unsigned long *) bits;
1555 fds.out = (unsigned long *) (bits + size);
1556 fds.ex = (unsigned long *) (bits + 2*size);
1557 fds.res_in = (unsigned long *) (bits + 3*size);
1558 fds.res_out = (unsigned long *) (bits + 4*size);
1559 fds.res_ex = (unsigned long *) (bits + 5*size);
1560
1561 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1562 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1563 (ret = compat_get_fd_set(n, exp, fds.ex)))
1564 goto out;
1565 zero_fd_set(n, fds.res_in);
1566 zero_fd_set(n, fds.res_out);
1567 zero_fd_set(n, fds.res_ex);
1568
1569 ret = do_select(n, &fds, timeout);
1570
1571 if (ret < 0)
1572 goto out;
1573 if (!ret) {
1574 ret = -ERESTARTNOHAND;
1575 if (signal_pending(current))
1576 goto out;
1577 ret = 0;
1578 }
1579
1580 if (compat_set_fd_set(n, inp, fds.res_in) ||
1581 compat_set_fd_set(n, outp, fds.res_out) ||
1582 compat_set_fd_set(n, exp, fds.res_ex))
1583 ret = -EFAULT;
1584 out:
1585 if (bits != stack_fds)
1586 kfree(bits);
1587 out_nofds:
1588 return ret;
1589 }
1590
1591 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1592 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1593 struct compat_timeval __user *tvp)
1594 {
1595 s64 timeout = -1;
1596 struct compat_timeval tv;
1597 int ret;
1598
1599 if (tvp) {
1600 if (copy_from_user(&tv, tvp, sizeof(tv)))
1601 return -EFAULT;
1602
1603 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1604 return -EINVAL;
1605
1606 /* Cast to u64 to make GCC stop complaining */
1607 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1608 timeout = -1; /* infinite */
1609 else {
1610 timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
1611 timeout += tv.tv_sec * HZ;
1612 }
1613 }
1614
1615 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1616
1617 if (tvp) {
1618 struct compat_timeval rtv;
1619
1620 if (current->personality & STICKY_TIMEOUTS)
1621 goto sticky;
1622 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1623 rtv.tv_sec = timeout;
1624 if (compat_timeval_compare(&rtv, &tv) >= 0)
1625 rtv = tv;
1626 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1627 sticky:
1628 /*
1629 * If an application puts its timeval in read-only
1630 * memory, we don't want the Linux-specific update to
1631 * the timeval to cause a fault after the select has
1632 * completed successfully. However, because we're not
1633 * updating the timeval, we can't restart the system
1634 * call.
1635 */
1636 if (ret == -ERESTARTNOHAND)
1637 ret = -EINTR;
1638 }
1639 }
1640
1641 return ret;
1642 }
1643
1644 #ifdef TIF_RESTORE_SIGMASK
1645 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1646 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1647 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1648 compat_size_t sigsetsize)
1649 {
1650 compat_sigset_t ss32;
1651 sigset_t ksigmask, sigsaved;
1652 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1653 struct compat_timespec ts;
1654 int ret;
1655
1656 if (tsp) {
1657 if (copy_from_user(&ts, tsp, sizeof(ts)))
1658 return -EFAULT;
1659
1660 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1661 return -EINVAL;
1662 }
1663
1664 if (sigmask) {
1665 if (sigsetsize != sizeof(compat_sigset_t))
1666 return -EINVAL;
1667 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1668 return -EFAULT;
1669 sigset_from_compat(&ksigmask, &ss32);
1670
1671 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1672 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1673 }
1674
1675 do {
1676 if (tsp) {
1677 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1678 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1679 timeout += ts.tv_sec * (unsigned long)HZ;
1680 ts.tv_sec = 0;
1681 ts.tv_nsec = 0;
1682 } else {
1683 ts.tv_sec -= MAX_SELECT_SECONDS;
1684 timeout = MAX_SELECT_SECONDS * HZ;
1685 }
1686 }
1687
1688 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1689
1690 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1691
1692 if (tsp) {
1693 struct compat_timespec rts;
1694
1695 if (current->personality & STICKY_TIMEOUTS)
1696 goto sticky;
1697
1698 rts.tv_sec = timeout / HZ;
1699 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1700 if (rts.tv_nsec >= NSEC_PER_SEC) {
1701 rts.tv_sec++;
1702 rts.tv_nsec -= NSEC_PER_SEC;
1703 }
1704 if (compat_timespec_compare(&rts, &ts) >= 0)
1705 rts = ts;
1706 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1707 sticky:
1708 /*
1709 * If an application puts its timeval in read-only
1710 * memory, we don't want the Linux-specific update to
1711 * the timeval to cause a fault after the select has
1712 * completed successfully. However, because we're not
1713 * updating the timeval, we can't restart the system
1714 * call.
1715 */
1716 if (ret == -ERESTARTNOHAND)
1717 ret = -EINTR;
1718 }
1719 }
1720
1721 if (ret == -ERESTARTNOHAND) {
1722 /*
1723 * Don't restore the signal mask yet. Let do_signal() deliver
1724 * the signal on the way back to userspace, before the signal
1725 * mask is restored.
1726 */
1727 if (sigmask) {
1728 memcpy(&current->saved_sigmask, &sigsaved,
1729 sizeof(sigsaved));
1730 set_thread_flag(TIF_RESTORE_SIGMASK);
1731 }
1732 } else if (sigmask)
1733 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1734
1735 return ret;
1736 }
1737
1738 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1739 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1740 struct compat_timespec __user *tsp, void __user *sig)
1741 {
1742 compat_size_t sigsetsize = 0;
1743 compat_uptr_t up = 0;
1744
1745 if (sig) {
1746 if (!access_ok(VERIFY_READ, sig,
1747 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1748 __get_user(up, (compat_uptr_t __user *)sig) ||
1749 __get_user(sigsetsize,
1750 (compat_size_t __user *)(sig+sizeof(up))))
1751 return -EFAULT;
1752 }
1753 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1754 sigsetsize);
1755 }
1756
1757 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1758 unsigned int nfds, struct compat_timespec __user *tsp,
1759 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1760 {
1761 compat_sigset_t ss32;
1762 sigset_t ksigmask, sigsaved;
1763 struct compat_timespec ts;
1764 s64 timeout = -1;
1765 int ret;
1766
1767 if (tsp) {
1768 if (copy_from_user(&ts, tsp, sizeof(ts)))
1769 return -EFAULT;
1770
1771 /* We assume that ts.tv_sec is always lower than
1772 the number of seconds that can be expressed in
1773 an s64. Otherwise the compiler bitches at us */
1774 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1775 timeout += ts.tv_sec * HZ;
1776 }
1777
1778 if (sigmask) {
1779 if (sigsetsize != sizeof(compat_sigset_t))
1780 return -EINVAL;
1781 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1782 return -EFAULT;
1783 sigset_from_compat(&ksigmask, &ss32);
1784
1785 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1786 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1787 }
1788
1789 ret = do_sys_poll(ufds, nfds, &timeout);
1790
1791 /* We can restart this syscall, usually */
1792 if (ret == -EINTR) {
1793 /*
1794 * Don't restore the signal mask yet. Let do_signal() deliver
1795 * the signal on the way back to userspace, before the signal
1796 * mask is restored.
1797 */
1798 if (sigmask) {
1799 memcpy(&current->saved_sigmask, &sigsaved,
1800 sizeof(sigsaved));
1801 set_thread_flag(TIF_RESTORE_SIGMASK);
1802 }
1803 ret = -ERESTARTNOHAND;
1804 } else if (sigmask)
1805 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1806
1807 if (tsp && timeout >= 0) {
1808 struct compat_timespec rts;
1809
1810 if (current->personality & STICKY_TIMEOUTS)
1811 goto sticky;
1812 /* Yes, we know it's actually an s64, but it's also positive. */
1813 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1814 1000;
1815 rts.tv_sec = timeout;
1816 if (compat_timespec_compare(&rts, &ts) >= 0)
1817 rts = ts;
1818 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1819 sticky:
1820 /*
1821 * If an application puts its timeval in read-only
1822 * memory, we don't want the Linux-specific update to
1823 * the timeval to cause a fault after the select has
1824 * completed successfully. However, because we're not
1825 * updating the timeval, we can't restart the system
1826 * call.
1827 */
1828 if (ret == -ERESTARTNOHAND && timeout >= 0)
1829 ret = -EINTR;
1830 }
1831 }
1832
1833 return ret;
1834 }
1835 #endif /* TIF_RESTORE_SIGMASK */
1836
1837 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1838 /* Stuff for NFS server syscalls... */
1839 struct compat_nfsctl_svc {
1840 u16 svc32_port;
1841 s32 svc32_nthreads;
1842 };
1843
1844 struct compat_nfsctl_client {
1845 s8 cl32_ident[NFSCLNT_IDMAX+1];
1846 s32 cl32_naddr;
1847 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1848 s32 cl32_fhkeytype;
1849 s32 cl32_fhkeylen;
1850 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1851 };
1852
1853 struct compat_nfsctl_export {
1854 char ex32_client[NFSCLNT_IDMAX+1];
1855 char ex32_path[NFS_MAXPATHLEN+1];
1856 compat_dev_t ex32_dev;
1857 compat_ino_t ex32_ino;
1858 compat_int_t ex32_flags;
1859 __compat_uid_t ex32_anon_uid;
1860 __compat_gid_t ex32_anon_gid;
1861 };
1862
1863 struct compat_nfsctl_fdparm {
1864 struct sockaddr gd32_addr;
1865 s8 gd32_path[NFS_MAXPATHLEN+1];
1866 compat_int_t gd32_version;
1867 };
1868
1869 struct compat_nfsctl_fsparm {
1870 struct sockaddr gd32_addr;
1871 s8 gd32_path[NFS_MAXPATHLEN+1];
1872 compat_int_t gd32_maxlen;
1873 };
1874
1875 struct compat_nfsctl_arg {
1876 compat_int_t ca32_version; /* safeguard */
1877 union {
1878 struct compat_nfsctl_svc u32_svc;
1879 struct compat_nfsctl_client u32_client;
1880 struct compat_nfsctl_export u32_export;
1881 struct compat_nfsctl_fdparm u32_getfd;
1882 struct compat_nfsctl_fsparm u32_getfs;
1883 } u;
1884 #define ca32_svc u.u32_svc
1885 #define ca32_client u.u32_client
1886 #define ca32_export u.u32_export
1887 #define ca32_getfd u.u32_getfd
1888 #define ca32_getfs u.u32_getfs
1889 };
1890
1891 union compat_nfsctl_res {
1892 __u8 cr32_getfh[NFS_FHSIZE];
1893 struct knfsd_fh cr32_getfs;
1894 };
1895
1896 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1897 struct compat_nfsctl_arg __user *arg)
1898 {
1899 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1900 get_user(karg->ca_version, &arg->ca32_version) ||
1901 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1902 __get_user(karg->ca_svc.svc_nthreads,
1903 &arg->ca32_svc.svc32_nthreads))
1904 return -EFAULT;
1905 return 0;
1906 }
1907
1908 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1909 struct compat_nfsctl_arg __user *arg)
1910 {
1911 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1912 sizeof(arg->ca32_client)) ||
1913 get_user(karg->ca_version, &arg->ca32_version) ||
1914 __copy_from_user(&karg->ca_client.cl_ident[0],
1915 &arg->ca32_client.cl32_ident[0],
1916 NFSCLNT_IDMAX) ||
1917 __get_user(karg->ca_client.cl_naddr,
1918 &arg->ca32_client.cl32_naddr) ||
1919 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1920 &arg->ca32_client.cl32_addrlist[0],
1921 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1922 __get_user(karg->ca_client.cl_fhkeytype,
1923 &arg->ca32_client.cl32_fhkeytype) ||
1924 __get_user(karg->ca_client.cl_fhkeylen,
1925 &arg->ca32_client.cl32_fhkeylen) ||
1926 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1927 &arg->ca32_client.cl32_fhkey[0],
1928 NFSCLNT_KEYMAX))
1929 return -EFAULT;
1930
1931 return 0;
1932 }
1933
1934 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1935 struct compat_nfsctl_arg __user *arg)
1936 {
1937 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1938 sizeof(arg->ca32_export)) ||
1939 get_user(karg->ca_version, &arg->ca32_version) ||
1940 __copy_from_user(&karg->ca_export.ex_client[0],
1941 &arg->ca32_export.ex32_client[0],
1942 NFSCLNT_IDMAX) ||
1943 __copy_from_user(&karg->ca_export.ex_path[0],
1944 &arg->ca32_export.ex32_path[0],
1945 NFS_MAXPATHLEN) ||
1946 __get_user(karg->ca_export.ex_dev,
1947 &arg->ca32_export.ex32_dev) ||
1948 __get_user(karg->ca_export.ex_ino,
1949 &arg->ca32_export.ex32_ino) ||
1950 __get_user(karg->ca_export.ex_flags,
1951 &arg->ca32_export.ex32_flags) ||
1952 __get_user(karg->ca_export.ex_anon_uid,
1953 &arg->ca32_export.ex32_anon_uid) ||
1954 __get_user(karg->ca_export.ex_anon_gid,
1955 &arg->ca32_export.ex32_anon_gid))
1956 return -EFAULT;
1957 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1958 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1959
1960 return 0;
1961 }
1962
1963 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1964 struct compat_nfsctl_arg __user *arg)
1965 {
1966 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1967 sizeof(arg->ca32_getfd)) ||
1968 get_user(karg->ca_version, &arg->ca32_version) ||
1969 __copy_from_user(&karg->ca_getfd.gd_addr,
1970 &arg->ca32_getfd.gd32_addr,
1971 (sizeof(struct sockaddr))) ||
1972 __copy_from_user(&karg->ca_getfd.gd_path,
1973 &arg->ca32_getfd.gd32_path,
1974 (NFS_MAXPATHLEN+1)) ||
1975 __get_user(karg->ca_getfd.gd_version,
1976 &arg->ca32_getfd.gd32_version))
1977 return -EFAULT;
1978
1979 return 0;
1980 }
1981
1982 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1983 struct compat_nfsctl_arg __user *arg)
1984 {
1985 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1986 get_user(karg->ca_version, &arg->ca32_version) ||
1987 __copy_from_user(&karg->ca_getfs.gd_addr,
1988 &arg->ca32_getfs.gd32_addr,
1989 (sizeof(struct sockaddr))) ||
1990 __copy_from_user(&karg->ca_getfs.gd_path,
1991 &arg->ca32_getfs.gd32_path,
1992 (NFS_MAXPATHLEN+1)) ||
1993 __get_user(karg->ca_getfs.gd_maxlen,
1994 &arg->ca32_getfs.gd32_maxlen))
1995 return -EFAULT;
1996
1997 return 0;
1998 }
1999
2000 /* This really doesn't need translations, we are only passing
2001 * back a union which contains opaque nfs file handle data.
2002 */
2003 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2004 union compat_nfsctl_res __user *res)
2005 {
2006 int err;
2007
2008 err = copy_to_user(res, kres, sizeof(*res));
2009
2010 return (err) ? -EFAULT : 0;
2011 }
2012
2013 asmlinkage long compat_sys_nfsservctl(int cmd,
2014 struct compat_nfsctl_arg __user *arg,
2015 union compat_nfsctl_res __user *res)
2016 {
2017 struct nfsctl_arg *karg;
2018 union nfsctl_res *kres;
2019 mm_segment_t oldfs;
2020 int err;
2021
2022 karg = kmalloc(sizeof(*karg), GFP_USER);
2023 kres = kmalloc(sizeof(*kres), GFP_USER);
2024 if(!karg || !kres) {
2025 err = -ENOMEM;
2026 goto done;
2027 }
2028
2029 switch(cmd) {
2030 case NFSCTL_SVC:
2031 err = compat_nfs_svc_trans(karg, arg);
2032 break;
2033
2034 case NFSCTL_ADDCLIENT:
2035 err = compat_nfs_clnt_trans(karg, arg);
2036 break;
2037
2038 case NFSCTL_DELCLIENT:
2039 err = compat_nfs_clnt_trans(karg, arg);
2040 break;
2041
2042 case NFSCTL_EXPORT:
2043 case NFSCTL_UNEXPORT:
2044 err = compat_nfs_exp_trans(karg, arg);
2045 break;
2046
2047 case NFSCTL_GETFD:
2048 err = compat_nfs_getfd_trans(karg, arg);
2049 break;
2050
2051 case NFSCTL_GETFS:
2052 err = compat_nfs_getfs_trans(karg, arg);
2053 break;
2054
2055 default:
2056 err = -EINVAL;
2057 break;
2058 }
2059
2060 if (err)
2061 goto done;
2062
2063 oldfs = get_fs();
2064 set_fs(KERNEL_DS);
2065 /* The __user pointer casts are valid because of the set_fs() */
2066 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2067 set_fs(oldfs);
2068
2069 if (err)
2070 goto done;
2071
2072 if((cmd == NFSCTL_GETFD) ||
2073 (cmd == NFSCTL_GETFS))
2074 err = compat_nfs_getfh_res_trans(kres, res);
2075
2076 done:
2077 kfree(karg);
2078 kfree(kres);
2079 return err;
2080 }
2081 #else /* !NFSD */
2082 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2083 {
2084 return sys_ni_syscall();
2085 }
2086 #endif
2087
2088 #ifdef CONFIG_EPOLL
2089
2090 #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
2091 asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd,
2092 struct compat_epoll_event __user *event)
2093 {
2094 long err = 0;
2095 struct compat_epoll_event user;
2096 struct epoll_event __user *kernel = NULL;
2097
2098 if (event) {
2099 if (copy_from_user(&user, event, sizeof(user)))
2100 return -EFAULT;
2101 kernel = compat_alloc_user_space(sizeof(struct epoll_event));
2102 err |= __put_user(user.events, &kernel->events);
2103 err |= __put_user(user.data, &kernel->data);
2104 }
2105
2106 return err ? err : sys_epoll_ctl(epfd, op, fd, kernel);
2107 }
2108
2109
2110 asmlinkage long compat_sys_epoll_wait(int epfd,
2111 struct compat_epoll_event __user *events,
2112 int maxevents, int timeout)
2113 {
2114 long i, ret, err = 0;
2115 struct epoll_event __user *kbuf;
2116 struct epoll_event ev;
2117
2118 if ((maxevents <= 0) ||
2119 (maxevents > (INT_MAX / sizeof(struct epoll_event))))
2120 return -EINVAL;
2121 kbuf = compat_alloc_user_space(sizeof(struct epoll_event) * maxevents);
2122 ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
2123 for (i = 0; i < ret; i++) {
2124 err |= __get_user(ev.events, &kbuf[i].events);
2125 err |= __get_user(ev.data, &kbuf[i].data);
2126 err |= __put_user(ev.events, &events->events);
2127 err |= __put_user_unaligned(ev.data, &events->data);
2128 events++;
2129 }
2130
2131 return err ? -EFAULT: ret;
2132 }
2133 #endif /* CONFIG_HAS_COMPAT_EPOLL_EVENT */
2134
2135 #ifdef TIF_RESTORE_SIGMASK
2136 asmlinkage long compat_sys_epoll_pwait(int epfd,
2137 struct compat_epoll_event __user *events,
2138 int maxevents, int timeout,
2139 const compat_sigset_t __user *sigmask,
2140 compat_size_t sigsetsize)
2141 {
2142 long err;
2143 compat_sigset_t csigmask;
2144 sigset_t ksigmask, sigsaved;
2145
2146 /*
2147 * If the caller wants a certain signal mask to be set during the wait,
2148 * we apply it here.
2149 */
2150 if (sigmask) {
2151 if (sigsetsize != sizeof(compat_sigset_t))
2152 return -EINVAL;
2153 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2154 return -EFAULT;
2155 sigset_from_compat(&ksigmask, &csigmask);
2156 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2157 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2158 }
2159
2160 #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
2161 err = compat_sys_epoll_wait(epfd, events, maxevents, timeout);
2162 #else
2163 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2164 #endif
2165
2166 /*
2167 * If we changed the signal mask, we need to restore the original one.
2168 * In case we've got a signal while waiting, we do not restore the
2169 * signal mask yet, and we allow do_signal() to deliver the signal on
2170 * the way back to userspace, before the signal mask is restored.
2171 */
2172 if (sigmask) {
2173 if (err == -EINTR) {
2174 memcpy(&current->saved_sigmask, &sigsaved,
2175 sizeof(sigsaved));
2176 set_thread_flag(TIF_RESTORE_SIGMASK);
2177 } else
2178 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2179 }
2180
2181 return err;
2182 }
2183 #endif /* TIF_RESTORE_SIGMASK */
2184
2185 #endif /* CONFIG_EPOLL */
2186
2187 #ifdef CONFIG_SIGNALFD
2188
2189 asmlinkage long compat_sys_signalfd(int ufd,
2190 const compat_sigset_t __user *sigmask,
2191 compat_size_t sigsetsize)
2192 {
2193 compat_sigset_t ss32;
2194 sigset_t tmp;
2195 sigset_t __user *ksigmask;
2196
2197 if (sigsetsize != sizeof(compat_sigset_t))
2198 return -EINVAL;
2199 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2200 return -EFAULT;
2201 sigset_from_compat(&tmp, &ss32);
2202 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2203 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2204 return -EFAULT;
2205
2206 return sys_signalfd(ufd, ksigmask, sizeof(sigset_t));
2207 }
2208
2209 #endif /* CONFIG_SIGNALFD */
2210
2211 #ifdef CONFIG_TIMERFD
2212
2213 asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
2214 const struct compat_itimerspec __user *utmr)
2215 {
2216 struct itimerspec t;
2217 struct itimerspec __user *ut;
2218
2219 if (get_compat_itimerspec(&t, utmr))
2220 return -EFAULT;
2221 ut = compat_alloc_user_space(sizeof(*ut));
2222 if (copy_to_user(ut, &t, sizeof(t)))
2223 return -EFAULT;
2224
2225 return sys_timerfd(ufd, clockid, flags, ut);
2226 }
2227
2228 #endif /* CONFIG_TIMERFD */
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