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thinkpad-acpi: be more strict when detecting a ThinkPad
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / compat.c
blob93b8ebf040b739e14e003535cae8c466ef2cae92
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/fdtable.h>
28 #include <linux/vfs.h>
29 #include <linux/ioctl.h>
30 #include <linux/init.h>
31 #include <linux/smb.h>
32 #include <linux/smb_mount.h>
33 #include <linux/ncp_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/smp_lock.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/nfsd/nfsd.h>
44 #include <linux/nfsd/syscall.h>
45 #include <linux/personality.h>
46 #include <linux/rwsem.h>
47 #include <linux/tsacct_kern.h>
48 #include <linux/security.h>
49 #include <linux/highmem.h>
50 #include <linux/signal.h>
51 #include <linux/poll.h>
52 #include <linux/mm.h>
53 #include <linux/eventpoll.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(char __user *filename, 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, char __user *filename, struct compat_timespec __user *t, int flags)
95 {
96 struct timespec tv[2];
97
98 if (t) {
99 if (get_compat_timespec(&tv[0], &t[0]) ||
100 get_compat_timespec(&tv[1], &t[1]))
101 return -EFAULT;
102
103 if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW)
104 && tv[0].tv_sec != 0)
105 return -EINVAL;
106 if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW)
107 && tv[1].tv_sec != 0)
108 return -EINVAL;
109
110 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
111 return 0;
112 }
113 return do_utimes(dfd, filename, t ? tv : NULL, flags);
114 }
115
116 asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
117 {
118 struct timespec tv[2];
119
120 if (t) {
121 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
122 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
123 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
124 get_user(tv[1].tv_nsec, &t[1].tv_usec))
125 return -EFAULT;
126 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
127 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
128 return -EINVAL;
129 tv[0].tv_nsec *= 1000;
130 tv[1].tv_nsec *= 1000;
131 }
132 return do_utimes(dfd, filename, t ? tv : NULL, 0);
133 }
134
135 asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
136 {
137 return compat_sys_futimesat(AT_FDCWD, filename, t);
138 }
139
140 asmlinkage long compat_sys_newstat(char __user * filename,
141 struct compat_stat __user *statbuf)
142 {
143 struct kstat stat;
144 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
145
146 if (!error)
147 error = cp_compat_stat(&stat, statbuf);
148 return error;
149 }
150
151 asmlinkage long compat_sys_newlstat(char __user * filename,
152 struct compat_stat __user *statbuf)
153 {
154 struct kstat stat;
155 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
156
157 if (!error)
158 error = cp_compat_stat(&stat, statbuf);
159 return error;
160 }
161
162 #ifndef __ARCH_WANT_STAT64
163 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
164 struct compat_stat __user *statbuf, int flag)
165 {
166 struct kstat stat;
167 int error = -EINVAL;
168
169 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
170 goto out;
171
172 if (flag & AT_SYMLINK_NOFOLLOW)
173 error = vfs_lstat_fd(dfd, filename, &stat);
174 else
175 error = vfs_stat_fd(dfd, filename, &stat);
176
177 if (!error)
178 error = cp_compat_stat(&stat, statbuf);
179
180 out:
181 return error;
182 }
183 #endif
184
185 asmlinkage long compat_sys_newfstat(unsigned int fd,
186 struct compat_stat __user * statbuf)
187 {
188 struct kstat stat;
189 int error = vfs_fstat(fd, &stat);
190
191 if (!error)
192 error = cp_compat_stat(&stat, statbuf);
193 return error;
194 }
195
196 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
197 {
198
199 if (sizeof ubuf->f_blocks == 4) {
200 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
201 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
202 return -EOVERFLOW;
203 /* f_files and f_ffree may be -1; it's okay
204 * to stuff that into 32 bits */
205 if (kbuf->f_files != 0xffffffffffffffffULL
206 && (kbuf->f_files & 0xffffffff00000000ULL))
207 return -EOVERFLOW;
208 if (kbuf->f_ffree != 0xffffffffffffffffULL
209 && (kbuf->f_ffree & 0xffffffff00000000ULL))
210 return -EOVERFLOW;
211 }
212 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
213 __put_user(kbuf->f_type, &ubuf->f_type) ||
214 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
215 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
216 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
217 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
218 __put_user(kbuf->f_files, &ubuf->f_files) ||
219 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
220 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
221 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
222 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
223 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
224 __put_user(0, &ubuf->f_spare[0]) ||
225 __put_user(0, &ubuf->f_spare[1]) ||
226 __put_user(0, &ubuf->f_spare[2]) ||
227 __put_user(0, &ubuf->f_spare[3]) ||
228 __put_user(0, &ubuf->f_spare[4]))
229 return -EFAULT;
230 return 0;
231 }
232
233 /*
234 * The following statfs calls are copies of code from fs/open.c and
235 * should be checked against those from time to time
236 */
237 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
238 {
239 struct path path;
240 int error;
241
242 error = user_path(pathname, &path);
243 if (!error) {
244 struct kstatfs tmp;
245 error = vfs_statfs(path.dentry, &tmp);
246 if (!error)
247 error = put_compat_statfs(buf, &tmp);
248 path_put(&path);
249 }
250 return error;
251 }
252
253 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
254 {
255 struct file * file;
256 struct kstatfs tmp;
257 int error;
258
259 error = -EBADF;
260 file = fget(fd);
261 if (!file)
262 goto out;
263 error = vfs_statfs(file->f_path.dentry, &tmp);
264 if (!error)
265 error = put_compat_statfs(buf, &tmp);
266 fput(file);
267 out:
268 return error;
269 }
270
271 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
272 {
273 if (sizeof ubuf->f_blocks == 4) {
274 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
275 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
276 return -EOVERFLOW;
277 /* f_files and f_ffree may be -1; it's okay
278 * to stuff that into 32 bits */
279 if (kbuf->f_files != 0xffffffffffffffffULL
280 && (kbuf->f_files & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 if (kbuf->f_ffree != 0xffffffffffffffffULL
283 && (kbuf->f_ffree & 0xffffffff00000000ULL))
284 return -EOVERFLOW;
285 }
286 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
287 __put_user(kbuf->f_type, &ubuf->f_type) ||
288 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
289 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
290 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
291 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
292 __put_user(kbuf->f_files, &ubuf->f_files) ||
293 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
294 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
295 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
296 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
297 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
298 return -EFAULT;
299 return 0;
300 }
301
302 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
303 {
304 struct path path;
305 int error;
306
307 if (sz != sizeof(*buf))
308 return -EINVAL;
309
310 error = user_path(pathname, &path);
311 if (!error) {
312 struct kstatfs tmp;
313 error = vfs_statfs(path.dentry, &tmp);
314 if (!error)
315 error = put_compat_statfs64(buf, &tmp);
316 path_put(&path);
317 }
318 return error;
319 }
320
321 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
322 {
323 struct file * file;
324 struct kstatfs tmp;
325 int error;
326
327 if (sz != sizeof(*buf))
328 return -EINVAL;
329
330 error = -EBADF;
331 file = fget(fd);
332 if (!file)
333 goto out;
334 error = vfs_statfs(file->f_path.dentry, &tmp);
335 if (!error)
336 error = put_compat_statfs64(buf, &tmp);
337 fput(file);
338 out:
339 return error;
340 }
341
342 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
343 {
344 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
345 __get_user(kfl->l_type, &ufl->l_type) ||
346 __get_user(kfl->l_whence, &ufl->l_whence) ||
347 __get_user(kfl->l_start, &ufl->l_start) ||
348 __get_user(kfl->l_len, &ufl->l_len) ||
349 __get_user(kfl->l_pid, &ufl->l_pid))
350 return -EFAULT;
351 return 0;
352 }
353
354 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
355 {
356 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
357 __put_user(kfl->l_type, &ufl->l_type) ||
358 __put_user(kfl->l_whence, &ufl->l_whence) ||
359 __put_user(kfl->l_start, &ufl->l_start) ||
360 __put_user(kfl->l_len, &ufl->l_len) ||
361 __put_user(kfl->l_pid, &ufl->l_pid))
362 return -EFAULT;
363 return 0;
364 }
365
366 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
367 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
368 {
369 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
370 __get_user(kfl->l_type, &ufl->l_type) ||
371 __get_user(kfl->l_whence, &ufl->l_whence) ||
372 __get_user(kfl->l_start, &ufl->l_start) ||
373 __get_user(kfl->l_len, &ufl->l_len) ||
374 __get_user(kfl->l_pid, &ufl->l_pid))
375 return -EFAULT;
376 return 0;
377 }
378 #endif
379
380 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
381 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
382 {
383 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
384 __put_user(kfl->l_type, &ufl->l_type) ||
385 __put_user(kfl->l_whence, &ufl->l_whence) ||
386 __put_user(kfl->l_start, &ufl->l_start) ||
387 __put_user(kfl->l_len, &ufl->l_len) ||
388 __put_user(kfl->l_pid, &ufl->l_pid))
389 return -EFAULT;
390 return 0;
391 }
392 #endif
393
394 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
395 unsigned long arg)
396 {
397 mm_segment_t old_fs;
398 struct flock f;
399 long ret;
400
401 switch (cmd) {
402 case F_GETLK:
403 case F_SETLK:
404 case F_SETLKW:
405 ret = get_compat_flock(&f, compat_ptr(arg));
406 if (ret != 0)
407 break;
408 old_fs = get_fs();
409 set_fs(KERNEL_DS);
410 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
411 set_fs(old_fs);
412 if (cmd == F_GETLK && ret == 0) {
413 /* GETLK was successfule and we need to return the data...
414 * but it needs to fit in the compat structure.
415 * l_start shouldn't be too big, unless the original
416 * start + end is greater than COMPAT_OFF_T_MAX, in which
417 * case the app was asking for trouble, so we return
418 * -EOVERFLOW in that case.
419 * l_len could be too big, in which case we just truncate it,
420 * and only allow the app to see that part of the conflicting
421 * lock that might make sense to it anyway
422 */
423
424 if (f.l_start > COMPAT_OFF_T_MAX)
425 ret = -EOVERFLOW;
426 if (f.l_len > COMPAT_OFF_T_MAX)
427 f.l_len = COMPAT_OFF_T_MAX;
428 if (ret == 0)
429 ret = put_compat_flock(&f, compat_ptr(arg));
430 }
431 break;
432
433 case F_GETLK64:
434 case F_SETLK64:
435 case F_SETLKW64:
436 ret = get_compat_flock64(&f, compat_ptr(arg));
437 if (ret != 0)
438 break;
439 old_fs = get_fs();
440 set_fs(KERNEL_DS);
441 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
442 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
443 (unsigned long)&f);
444 set_fs(old_fs);
445 if (cmd == F_GETLK64 && ret == 0) {
446 /* need to return lock information - see above for commentary */
447 if (f.l_start > COMPAT_LOFF_T_MAX)
448 ret = -EOVERFLOW;
449 if (f.l_len > COMPAT_LOFF_T_MAX)
450 f.l_len = COMPAT_LOFF_T_MAX;
451 if (ret == 0)
452 ret = put_compat_flock64(&f, compat_ptr(arg));
453 }
454 break;
455
456 default:
457 ret = sys_fcntl(fd, cmd, arg);
458 break;
459 }
460 return ret;
461 }
462
463 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
464 unsigned long arg)
465 {
466 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
467 return -EINVAL;
468 return compat_sys_fcntl64(fd, cmd, arg);
469 }
470
471 asmlinkage long
472 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
473 {
474 long ret;
475 aio_context_t ctx64;
476
477 mm_segment_t oldfs = get_fs();
478 if (unlikely(get_user(ctx64, ctx32p)))
479 return -EFAULT;
480
481 set_fs(KERNEL_DS);
482 /* The __user pointer cast is valid because of the set_fs() */
483 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
484 set_fs(oldfs);
485 /* truncating is ok because it's a user address */
486 if (!ret)
487 ret = put_user((u32) ctx64, ctx32p);
488 return ret;
489 }
490
491 asmlinkage long
492 compat_sys_io_getevents(aio_context_t ctx_id,
493 unsigned long min_nr,
494 unsigned long nr,
495 struct io_event __user *events,
496 struct compat_timespec __user *timeout)
497 {
498 long ret;
499 struct timespec t;
500 struct timespec __user *ut = NULL;
501
502 ret = -EFAULT;
503 if (unlikely(!access_ok(VERIFY_WRITE, events,
504 nr * sizeof(struct io_event))))
505 goto out;
506 if (timeout) {
507 if (get_compat_timespec(&t, timeout))
508 goto out;
509
510 ut = compat_alloc_user_space(sizeof(*ut));
511 if (copy_to_user(ut, &t, sizeof(t)) )
512 goto out;
513 }
514 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
515 out:
516 return ret;
517 }
518
519 static inline long
520 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
521 {
522 compat_uptr_t uptr;
523 int i;
524
525 for (i = 0; i < nr; ++i) {
526 if (get_user(uptr, ptr32 + i))
527 return -EFAULT;
528 if (put_user(compat_ptr(uptr), ptr64 + i))
529 return -EFAULT;
530 }
531 return 0;
532 }
533
534 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
535
536 asmlinkage long
537 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
538 {
539 struct iocb __user * __user *iocb64;
540 long ret;
541
542 if (unlikely(nr < 0))
543 return -EINVAL;
544
545 if (nr > MAX_AIO_SUBMITS)
546 nr = MAX_AIO_SUBMITS;
547
548 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
549 ret = copy_iocb(nr, iocb, iocb64);
550 if (!ret)
551 ret = sys_io_submit(ctx_id, nr, iocb64);
552 return ret;
553 }
554
555 struct compat_ncp_mount_data {
556 compat_int_t version;
557 compat_uint_t ncp_fd;
558 __compat_uid_t mounted_uid;
559 compat_pid_t wdog_pid;
560 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
561 compat_uint_t time_out;
562 compat_uint_t retry_count;
563 compat_uint_t flags;
564 __compat_uid_t uid;
565 __compat_gid_t gid;
566 compat_mode_t file_mode;
567 compat_mode_t dir_mode;
568 };
569
570 struct compat_ncp_mount_data_v4 {
571 compat_int_t version;
572 compat_ulong_t flags;
573 compat_ulong_t mounted_uid;
574 compat_long_t wdog_pid;
575 compat_uint_t ncp_fd;
576 compat_uint_t time_out;
577 compat_uint_t retry_count;
578 compat_ulong_t uid;
579 compat_ulong_t gid;
580 compat_ulong_t file_mode;
581 compat_ulong_t dir_mode;
582 };
583
584 static void *do_ncp_super_data_conv(void *raw_data)
585 {
586 int version = *(unsigned int *)raw_data;
587
588 if (version == 3) {
589 struct compat_ncp_mount_data *c_n = raw_data;
590 struct ncp_mount_data *n = raw_data;
591
592 n->dir_mode = c_n->dir_mode;
593 n->file_mode = c_n->file_mode;
594 n->gid = c_n->gid;
595 n->uid = c_n->uid;
596 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
597 n->wdog_pid = c_n->wdog_pid;
598 n->mounted_uid = c_n->mounted_uid;
599 } else if (version == 4) {
600 struct compat_ncp_mount_data_v4 *c_n = raw_data;
601 struct ncp_mount_data_v4 *n = raw_data;
602
603 n->dir_mode = c_n->dir_mode;
604 n->file_mode = c_n->file_mode;
605 n->gid = c_n->gid;
606 n->uid = c_n->uid;
607 n->retry_count = c_n->retry_count;
608 n->time_out = c_n->time_out;
609 n->ncp_fd = c_n->ncp_fd;
610 n->wdog_pid = c_n->wdog_pid;
611 n->mounted_uid = c_n->mounted_uid;
612 n->flags = c_n->flags;
613 } else if (version != 5) {
614 return NULL;
615 }
616
617 return raw_data;
618 }
619
620 struct compat_smb_mount_data {
621 compat_int_t version;
622 __compat_uid_t mounted_uid;
623 __compat_uid_t uid;
624 __compat_gid_t gid;
625 compat_mode_t file_mode;
626 compat_mode_t dir_mode;
627 };
628
629 static void *do_smb_super_data_conv(void *raw_data)
630 {
631 struct smb_mount_data *s = raw_data;
632 struct compat_smb_mount_data *c_s = raw_data;
633
634 if (c_s->version != SMB_MOUNT_OLDVERSION)
635 goto out;
636 s->dir_mode = c_s->dir_mode;
637 s->file_mode = c_s->file_mode;
638 s->gid = c_s->gid;
639 s->uid = c_s->uid;
640 s->mounted_uid = c_s->mounted_uid;
641 out:
642 return raw_data;
643 }
644
645 struct compat_nfs_string {
646 compat_uint_t len;
647 compat_uptr_t data;
648 };
649
650 static inline void compat_nfs_string(struct nfs_string *dst,
651 struct compat_nfs_string *src)
652 {
653 dst->data = compat_ptr(src->data);
654 dst->len = src->len;
655 }
656
657 struct compat_nfs4_mount_data_v1 {
658 compat_int_t version;
659 compat_int_t flags;
660 compat_int_t rsize;
661 compat_int_t wsize;
662 compat_int_t timeo;
663 compat_int_t retrans;
664 compat_int_t acregmin;
665 compat_int_t acregmax;
666 compat_int_t acdirmin;
667 compat_int_t acdirmax;
668 struct compat_nfs_string client_addr;
669 struct compat_nfs_string mnt_path;
670 struct compat_nfs_string hostname;
671 compat_uint_t host_addrlen;
672 compat_uptr_t host_addr;
673 compat_int_t proto;
674 compat_int_t auth_flavourlen;
675 compat_uptr_t auth_flavours;
676 };
677
678 static int do_nfs4_super_data_conv(void *raw_data)
679 {
680 int version = *(compat_uint_t *) raw_data;
681
682 if (version == 1) {
683 struct compat_nfs4_mount_data_v1 *raw = raw_data;
684 struct nfs4_mount_data *real = raw_data;
685
686 /* copy the fields backwards */
687 real->auth_flavours = compat_ptr(raw->auth_flavours);
688 real->auth_flavourlen = raw->auth_flavourlen;
689 real->proto = raw->proto;
690 real->host_addr = compat_ptr(raw->host_addr);
691 real->host_addrlen = raw->host_addrlen;
692 compat_nfs_string(&real->hostname, &raw->hostname);
693 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
694 compat_nfs_string(&real->client_addr, &raw->client_addr);
695 real->acdirmax = raw->acdirmax;
696 real->acdirmin = raw->acdirmin;
697 real->acregmax = raw->acregmax;
698 real->acregmin = raw->acregmin;
699 real->retrans = raw->retrans;
700 real->timeo = raw->timeo;
701 real->wsize = raw->wsize;
702 real->rsize = raw->rsize;
703 real->flags = raw->flags;
704 real->version = raw->version;
705 }
706
707 return 0;
708 }
709
710 #define SMBFS_NAME "smbfs"
711 #define NCPFS_NAME "ncpfs"
712 #define NFS4_NAME "nfs4"
713
714 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
715 char __user * type, unsigned long flags,
716 void __user * data)
717 {
718 unsigned long type_page;
719 unsigned long data_page;
720 unsigned long dev_page;
721 char *dir_page;
722 int retval;
723
724 retval = copy_mount_options (type, &type_page);
725 if (retval < 0)
726 goto out;
727
728 dir_page = getname(dir_name);
729 retval = PTR_ERR(dir_page);
730 if (IS_ERR(dir_page))
731 goto out1;
732
733 retval = copy_mount_options (dev_name, &dev_page);
734 if (retval < 0)
735 goto out2;
736
737 retval = copy_mount_options (data, &data_page);
738 if (retval < 0)
739 goto out3;
740
741 retval = -EINVAL;
742
743 if (type_page && data_page) {
744 if (!strcmp((char *)type_page, SMBFS_NAME)) {
745 do_smb_super_data_conv((void *)data_page);
746 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
747 do_ncp_super_data_conv((void *)data_page);
748 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
749 if (do_nfs4_super_data_conv((void *) data_page))
750 goto out4;
751 }
752 }
753
754 lock_kernel();
755 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
756 flags, (void*)data_page);
757 unlock_kernel();
758
759 out4:
760 free_page(data_page);
761 out3:
762 free_page(dev_page);
763 out2:
764 putname(dir_page);
765 out1:
766 free_page(type_page);
767 out:
768 return retval;
769 }
770
771 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
772
773 struct compat_old_linux_dirent {
774 compat_ulong_t d_ino;
775 compat_ulong_t d_offset;
776 unsigned short d_namlen;
777 char d_name[1];
778 };
779
780 struct compat_readdir_callback {
781 struct compat_old_linux_dirent __user *dirent;
782 int result;
783 };
784
785 static int compat_fillonedir(void *__buf, const char *name, int namlen,
786 loff_t offset, u64 ino, unsigned int d_type)
787 {
788 struct compat_readdir_callback *buf = __buf;
789 struct compat_old_linux_dirent __user *dirent;
790 compat_ulong_t d_ino;
791
792 if (buf->result)
793 return -EINVAL;
794 d_ino = ino;
795 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
796 buf->result = -EOVERFLOW;
797 return -EOVERFLOW;
798 }
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 buf->error = -EOVERFLOW;
869 return -EOVERFLOW;
870 }
871 dirent = buf->previous;
872 if (dirent) {
873 if (__put_user(offset, &dirent->d_off))
874 goto efault;
875 }
876 dirent = buf->current_dir;
877 if (__put_user(d_ino, &dirent->d_ino))
878 goto efault;
879 if (__put_user(reclen, &dirent->d_reclen))
880 goto efault;
881 if (copy_to_user(dirent->d_name, name, namlen))
882 goto efault;
883 if (__put_user(0, dirent->d_name + namlen))
884 goto efault;
885 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
886 goto efault;
887 buf->previous = dirent;
888 dirent = (void __user *)dirent + reclen;
889 buf->current_dir = dirent;
890 buf->count -= reclen;
891 return 0;
892 efault:
893 buf->error = -EFAULT;
894 return -EFAULT;
895 }
896
897 asmlinkage long compat_sys_getdents(unsigned int fd,
898 struct compat_linux_dirent __user *dirent, unsigned int count)
899 {
900 struct file * file;
901 struct compat_linux_dirent __user * lastdirent;
902 struct compat_getdents_callback buf;
903 int error;
904
905 error = -EFAULT;
906 if (!access_ok(VERIFY_WRITE, dirent, count))
907 goto out;
908
909 error = -EBADF;
910 file = fget(fd);
911 if (!file)
912 goto out;
913
914 buf.current_dir = dirent;
915 buf.previous = NULL;
916 buf.count = count;
917 buf.error = 0;
918
919 error = vfs_readdir(file, compat_filldir, &buf);
920 if (error < 0)
921 goto out_putf;
922 error = buf.error;
923 lastdirent = buf.previous;
924 if (lastdirent) {
925 if (put_user(file->f_pos, &lastdirent->d_off))
926 error = -EFAULT;
927 else
928 error = count - buf.count;
929 }
930
931 out_putf:
932 fput(file);
933 out:
934 return error;
935 }
936
937 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
938
939 struct compat_getdents_callback64 {
940 struct linux_dirent64 __user *current_dir;
941 struct linux_dirent64 __user *previous;
942 int count;
943 int error;
944 };
945
946 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
947 u64 ino, unsigned int d_type)
948 {
949 struct linux_dirent64 __user *dirent;
950 struct compat_getdents_callback64 *buf = __buf;
951 int jj = NAME_OFFSET(dirent);
952 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
953 u64 off;
954
955 buf->error = -EINVAL; /* only used if we fail.. */
956 if (reclen > buf->count)
957 return -EINVAL;
958 dirent = buf->previous;
959
960 if (dirent) {
961 if (__put_user_unaligned(offset, &dirent->d_off))
962 goto efault;
963 }
964 dirent = buf->current_dir;
965 if (__put_user_unaligned(ino, &dirent->d_ino))
966 goto efault;
967 off = 0;
968 if (__put_user_unaligned(off, &dirent->d_off))
969 goto efault;
970 if (__put_user(reclen, &dirent->d_reclen))
971 goto efault;
972 if (__put_user(d_type, &dirent->d_type))
973 goto efault;
974 if (copy_to_user(dirent->d_name, name, namlen))
975 goto efault;
976 if (__put_user(0, dirent->d_name + namlen))
977 goto efault;
978 buf->previous = dirent;
979 dirent = (void __user *)dirent + reclen;
980 buf->current_dir = dirent;
981 buf->count -= reclen;
982 return 0;
983 efault:
984 buf->error = -EFAULT;
985 return -EFAULT;
986 }
987
988 asmlinkage long compat_sys_getdents64(unsigned int fd,
989 struct linux_dirent64 __user * dirent, unsigned int count)
990 {
991 struct file * file;
992 struct linux_dirent64 __user * lastdirent;
993 struct compat_getdents_callback64 buf;
994 int error;
995
996 error = -EFAULT;
997 if (!access_ok(VERIFY_WRITE, dirent, count))
998 goto out;
999
1000 error = -EBADF;
1001 file = fget(fd);
1002 if (!file)
1003 goto out;
1004
1005 buf.current_dir = dirent;
1006 buf.previous = NULL;
1007 buf.count = count;
1008 buf.error = 0;
1009
1010 error = vfs_readdir(file, compat_filldir64, &buf);
1011 if (error < 0)
1012 goto out_putf;
1013 error = buf.error;
1014 lastdirent = buf.previous;
1015 if (lastdirent) {
1016 typeof(lastdirent->d_off) d_off = file->f_pos;
1017 error = -EFAULT;
1018 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1019 goto out_putf;
1020 error = count - buf.count;
1021 }
1022
1023 out_putf:
1024 fput(file);
1025 out:
1026 return error;
1027 }
1028 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1029
1030 static ssize_t compat_do_readv_writev(int type, struct file *file,
1031 const struct compat_iovec __user *uvector,
1032 unsigned long nr_segs, loff_t *pos)
1033 {
1034 compat_ssize_t tot_len;
1035 struct iovec iovstack[UIO_FASTIOV];
1036 struct iovec *iov=iovstack, *vector;
1037 ssize_t ret;
1038 int seg;
1039 io_fn_t fn;
1040 iov_fn_t fnv;
1041
1042 /*
1043 * SuS says "The readv() function *may* fail if the iovcnt argument
1044 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1045 * traditionally returned zero for zero segments, so...
1046 */
1047 ret = 0;
1048 if (nr_segs == 0)
1049 goto out;
1050
1051 /*
1052 * First get the "struct iovec" from user memory and
1053 * verify all the pointers
1054 */
1055 ret = -EINVAL;
1056 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1057 goto out;
1058 if (!file->f_op)
1059 goto out;
1060 if (nr_segs > UIO_FASTIOV) {
1061 ret = -ENOMEM;
1062 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1063 if (!iov)
1064 goto out;
1065 }
1066 ret = -EFAULT;
1067 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1068 goto out;
1069
1070 /*
1071 * Single unix specification:
1072 * We should -EINVAL if an element length is not >= 0 and fitting an
1073 * ssize_t. The total length is fitting an ssize_t
1074 *
1075 * Be careful here because iov_len is a size_t not an ssize_t
1076 */
1077 tot_len = 0;
1078 vector = iov;
1079 ret = -EINVAL;
1080 for (seg = 0 ; seg < nr_segs; seg++) {
1081 compat_ssize_t tmp = tot_len;
1082 compat_ssize_t len;
1083 compat_uptr_t buf;
1084
1085 if (__get_user(len, &uvector->iov_len) ||
1086 __get_user(buf, &uvector->iov_base)) {
1087 ret = -EFAULT;
1088 goto out;
1089 }
1090 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1091 goto out;
1092 tot_len += len;
1093 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1094 goto out;
1095 vector->iov_base = compat_ptr(buf);
1096 vector->iov_len = (compat_size_t) len;
1097 uvector++;
1098 vector++;
1099 }
1100 if (tot_len == 0) {
1101 ret = 0;
1102 goto out;
1103 }
1104
1105 ret = rw_verify_area(type, file, pos, tot_len);
1106 if (ret < 0)
1107 goto out;
1108
1109 fnv = NULL;
1110 if (type == READ) {
1111 fn = file->f_op->read;
1112 fnv = file->f_op->aio_read;
1113 } else {
1114 fn = (io_fn_t)file->f_op->write;
1115 fnv = file->f_op->aio_write;
1116 }
1117
1118 if (fnv)
1119 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1120 pos, fnv);
1121 else
1122 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1123
1124 out:
1125 if (iov != iovstack)
1126 kfree(iov);
1127 if ((ret + (type == READ)) > 0) {
1128 struct dentry *dentry = file->f_path.dentry;
1129 if (type == READ)
1130 fsnotify_access(dentry);
1131 else
1132 fsnotify_modify(dentry);
1133 }
1134 return ret;
1135 }
1136
1137 asmlinkage ssize_t
1138 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1139 {
1140 struct file *file;
1141 ssize_t ret = -EBADF;
1142
1143 file = fget(fd);
1144 if (!file)
1145 return -EBADF;
1146
1147 if (!(file->f_mode & FMODE_READ))
1148 goto out;
1149
1150 ret = -EINVAL;
1151 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1152 goto out;
1153
1154 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1155
1156 out:
1157 fput(file);
1158 return ret;
1159 }
1160
1161 asmlinkage ssize_t
1162 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1163 {
1164 struct file *file;
1165 ssize_t ret = -EBADF;
1166
1167 file = fget(fd);
1168 if (!file)
1169 return -EBADF;
1170 if (!(file->f_mode & FMODE_WRITE))
1171 goto out;
1172
1173 ret = -EINVAL;
1174 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1175 goto out;
1176
1177 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1178
1179 out:
1180 fput(file);
1181 return ret;
1182 }
1183
1184 asmlinkage long
1185 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1186 unsigned int nr_segs, unsigned int flags)
1187 {
1188 unsigned i;
1189 struct iovec __user *iov;
1190 if (nr_segs > UIO_MAXIOV)
1191 return -EINVAL;
1192 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1193 for (i = 0; i < nr_segs; i++) {
1194 struct compat_iovec v;
1195 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1196 get_user(v.iov_len, &iov32[i].iov_len) ||
1197 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1198 put_user(v.iov_len, &iov[i].iov_len))
1199 return -EFAULT;
1200 }
1201 return sys_vmsplice(fd, iov, nr_segs, flags);
1202 }
1203
1204 /*
1205 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1206 * O_LARGEFILE flag.
1207 */
1208 asmlinkage long
1209 compat_sys_open(const char __user *filename, int flags, int mode)
1210 {
1211 return do_sys_open(AT_FDCWD, filename, flags, mode);
1212 }
1213
1214 /*
1215 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1216 * O_LARGEFILE flag.
1217 */
1218 asmlinkage long
1219 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1220 {
1221 return do_sys_open(dfd, filename, flags, mode);
1222 }
1223
1224 /*
1225 * compat_count() counts the number of arguments/envelopes. It is basically
1226 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1227 * and envp pointers.
1228 */
1229 static int compat_count(compat_uptr_t __user *argv, int max)
1230 {
1231 int i = 0;
1232
1233 if (argv != NULL) {
1234 for (;;) {
1235 compat_uptr_t p;
1236
1237 if (get_user(p, argv))
1238 return -EFAULT;
1239 if (!p)
1240 break;
1241 argv++;
1242 if(++i > max)
1243 return -E2BIG;
1244
1245 if (fatal_signal_pending(current))
1246 return -ERESTARTNOHAND;
1247 cond_resched();
1248 }
1249 }
1250 return i;
1251 }
1252
1253 /*
1254 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1255 * except that it works with 32 bit argv and envp pointers.
1256 */
1257 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1258 struct linux_binprm *bprm)
1259 {
1260 struct page *kmapped_page = NULL;
1261 char *kaddr = NULL;
1262 unsigned long kpos = 0;
1263 int ret;
1264
1265 while (argc-- > 0) {
1266 compat_uptr_t str;
1267 int len;
1268 unsigned long pos;
1269
1270 if (get_user(str, argv+argc) ||
1271 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1272 ret = -EFAULT;
1273 goto out;
1274 }
1275
1276 if (len > MAX_ARG_STRLEN) {
1277 ret = -E2BIG;
1278 goto out;
1279 }
1280
1281 /* We're going to work our way backwords. */
1282 pos = bprm->p;
1283 str += len;
1284 bprm->p -= len;
1285
1286 while (len > 0) {
1287 int offset, bytes_to_copy;
1288
1289 if (fatal_signal_pending(current)) {
1290 ret = -ERESTARTNOHAND;
1291 goto out;
1292 }
1293 cond_resched();
1294
1295 offset = pos % PAGE_SIZE;
1296 if (offset == 0)
1297 offset = PAGE_SIZE;
1298
1299 bytes_to_copy = offset;
1300 if (bytes_to_copy > len)
1301 bytes_to_copy = len;
1302
1303 offset -= bytes_to_copy;
1304 pos -= bytes_to_copy;
1305 str -= bytes_to_copy;
1306 len -= bytes_to_copy;
1307
1308 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1309 struct page *page;
1310
1311 page = get_arg_page(bprm, pos, 1);
1312 if (!page) {
1313 ret = -E2BIG;
1314 goto out;
1315 }
1316
1317 if (kmapped_page) {
1318 flush_kernel_dcache_page(kmapped_page);
1319 kunmap(kmapped_page);
1320 put_page(kmapped_page);
1321 }
1322 kmapped_page = page;
1323 kaddr = kmap(kmapped_page);
1324 kpos = pos & PAGE_MASK;
1325 flush_cache_page(bprm->vma, kpos,
1326 page_to_pfn(kmapped_page));
1327 }
1328 if (copy_from_user(kaddr+offset, compat_ptr(str),
1329 bytes_to_copy)) {
1330 ret = -EFAULT;
1331 goto out;
1332 }
1333 }
1334 }
1335 ret = 0;
1336 out:
1337 if (kmapped_page) {
1338 flush_kernel_dcache_page(kmapped_page);
1339 kunmap(kmapped_page);
1340 put_page(kmapped_page);
1341 }
1342 return ret;
1343 }
1344
1345 /*
1346 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1347 * that it processes 32 bit argv and envp pointers.
1348 */
1349 int compat_do_execve(char * filename,
1350 compat_uptr_t __user *argv,
1351 compat_uptr_t __user *envp,
1352 struct pt_regs * regs)
1353 {
1354 struct linux_binprm *bprm;
1355 struct file *file;
1356 struct files_struct *displaced;
1357 int retval;
1358
1359 retval = unshare_files(&displaced);
1360 if (retval)
1361 goto out_ret;
1362
1363 retval = -ENOMEM;
1364 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1365 if (!bprm)
1366 goto out_files;
1367
1368 file = open_exec(filename);
1369 retval = PTR_ERR(file);
1370 if (IS_ERR(file))
1371 goto out_kfree;
1372
1373 sched_exec();
1374
1375 bprm->file = file;
1376 bprm->filename = filename;
1377 bprm->interp = filename;
1378
1379 retval = bprm_mm_init(bprm);
1380 if (retval)
1381 goto out_file;
1382
1383 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1384 if ((retval = bprm->argc) < 0)
1385 goto out_mm;
1386
1387 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1388 if ((retval = bprm->envc) < 0)
1389 goto out_mm;
1390
1391 retval = security_bprm_alloc(bprm);
1392 if (retval)
1393 goto out;
1394
1395 retval = prepare_binprm(bprm);
1396 if (retval < 0)
1397 goto out;
1398
1399 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1400 if (retval < 0)
1401 goto out;
1402
1403 bprm->exec = bprm->p;
1404 retval = compat_copy_strings(bprm->envc, envp, bprm);
1405 if (retval < 0)
1406 goto out;
1407
1408 retval = compat_copy_strings(bprm->argc, argv, bprm);
1409 if (retval < 0)
1410 goto out;
1411
1412 retval = search_binary_handler(bprm, regs);
1413 if (retval >= 0) {
1414 /* execve success */
1415 security_bprm_free(bprm);
1416 acct_update_integrals(current);
1417 free_bprm(bprm);
1418 if (displaced)
1419 put_files_struct(displaced);
1420 return retval;
1421 }
1422
1423 out:
1424 if (bprm->security)
1425 security_bprm_free(bprm);
1426
1427 out_mm:
1428 if (bprm->mm) {
1429 acct_arg_size(bprm, 0);
1430 mmput(bprm->mm);
1431 }
1432
1433 out_file:
1434 if (bprm->file) {
1435 allow_write_access(bprm->file);
1436 fput(bprm->file);
1437 }
1438
1439 out_kfree:
1440 free_bprm(bprm);
1441
1442 out_files:
1443 if (displaced)
1444 reset_files_struct(displaced);
1445 out_ret:
1446 return retval;
1447 }
1448
1449 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1450
1451 /*
1452 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1453 * 64-bit unsigned longs.
1454 */
1455 static
1456 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1457 unsigned long *fdset)
1458 {
1459 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1460 if (ufdset) {
1461 unsigned long odd;
1462
1463 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1464 return -EFAULT;
1465
1466 odd = nr & 1UL;
1467 nr &= ~1UL;
1468 while (nr) {
1469 unsigned long h, l;
1470 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1471 return -EFAULT;
1472 ufdset += 2;
1473 *fdset++ = h << 32 | l;
1474 nr -= 2;
1475 }
1476 if (odd && __get_user(*fdset, ufdset))
1477 return -EFAULT;
1478 } else {
1479 /* Tricky, must clear full unsigned long in the
1480 * kernel fdset at the end, this makes sure that
1481 * actually happens.
1482 */
1483 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1484 }
1485 return 0;
1486 }
1487
1488 static
1489 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1490 unsigned long *fdset)
1491 {
1492 unsigned long odd;
1493 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1494
1495 if (!ufdset)
1496 return 0;
1497
1498 odd = nr & 1UL;
1499 nr &= ~1UL;
1500 while (nr) {
1501 unsigned long h, l;
1502 l = *fdset++;
1503 h = l >> 32;
1504 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1505 return -EFAULT;
1506 ufdset += 2;
1507 nr -= 2;
1508 }
1509 if (odd && __put_user(*fdset, ufdset))
1510 return -EFAULT;
1511 return 0;
1512 }
1513
1514
1515 /*
1516 * This is a virtual copy of sys_select from fs/select.c and probably
1517 * should be compared to it from time to time
1518 */
1519
1520 /*
1521 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1522 * like to be certain this leads to no problems. So I return
1523 * EINTR just for safety.
1524 *
1525 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1526 * I'm trying ERESTARTNOHAND which restart only when you want to.
1527 */
1528 #define MAX_SELECT_SECONDS \
1529 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1530
1531 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1532 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1533 {
1534 fd_set_bits fds;
1535 void *bits;
1536 int size, max_fds, ret = -EINVAL;
1537 struct fdtable *fdt;
1538 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1539
1540 if (n < 0)
1541 goto out_nofds;
1542
1543 /* max_fds can increase, so grab it once to avoid race */
1544 rcu_read_lock();
1545 fdt = files_fdtable(current->files);
1546 max_fds = fdt->max_fds;
1547 rcu_read_unlock();
1548 if (n > max_fds)
1549 n = max_fds;
1550
1551 /*
1552 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1553 * since we used fdset we need to allocate memory in units of
1554 * long-words.
1555 */
1556 size = FDS_BYTES(n);
1557 bits = stack_fds;
1558 if (size > sizeof(stack_fds) / 6) {
1559 bits = kmalloc(6 * size, GFP_KERNEL);
1560 ret = -ENOMEM;
1561 if (!bits)
1562 goto out_nofds;
1563 }
1564 fds.in = (unsigned long *) bits;
1565 fds.out = (unsigned long *) (bits + size);
1566 fds.ex = (unsigned long *) (bits + 2*size);
1567 fds.res_in = (unsigned long *) (bits + 3*size);
1568 fds.res_out = (unsigned long *) (bits + 4*size);
1569 fds.res_ex = (unsigned long *) (bits + 5*size);
1570
1571 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1572 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1573 (ret = compat_get_fd_set(n, exp, fds.ex)))
1574 goto out;
1575 zero_fd_set(n, fds.res_in);
1576 zero_fd_set(n, fds.res_out);
1577 zero_fd_set(n, fds.res_ex);
1578
1579 ret = do_select(n, &fds, timeout);
1580
1581 if (ret < 0)
1582 goto out;
1583 if (!ret) {
1584 ret = -ERESTARTNOHAND;
1585 if (signal_pending(current))
1586 goto out;
1587 ret = 0;
1588 }
1589
1590 if (compat_set_fd_set(n, inp, fds.res_in) ||
1591 compat_set_fd_set(n, outp, fds.res_out) ||
1592 compat_set_fd_set(n, exp, fds.res_ex))
1593 ret = -EFAULT;
1594 out:
1595 if (bits != stack_fds)
1596 kfree(bits);
1597 out_nofds:
1598 return ret;
1599 }
1600
1601 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1602 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1603 struct compat_timeval __user *tvp)
1604 {
1605 s64 timeout = -1;
1606 struct compat_timeval tv;
1607 int ret;
1608
1609 if (tvp) {
1610 if (copy_from_user(&tv, tvp, sizeof(tv)))
1611 return -EFAULT;
1612
1613 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1614 return -EINVAL;
1615
1616 /* Cast to u64 to make GCC stop complaining */
1617 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1618 timeout = -1; /* infinite */
1619 else {
1620 timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
1621 timeout += tv.tv_sec * HZ;
1622 }
1623 }
1624
1625 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1626
1627 if (tvp) {
1628 struct compat_timeval rtv;
1629
1630 if (current->personality & STICKY_TIMEOUTS)
1631 goto sticky;
1632 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1633 rtv.tv_sec = timeout;
1634 if (compat_timeval_compare(&rtv, &tv) >= 0)
1635 rtv = tv;
1636 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1637 sticky:
1638 /*
1639 * If an application puts its timeval in read-only
1640 * memory, we don't want the Linux-specific update to
1641 * the timeval to cause a fault after the select has
1642 * completed successfully. However, because we're not
1643 * updating the timeval, we can't restart the system
1644 * call.
1645 */
1646 if (ret == -ERESTARTNOHAND)
1647 ret = -EINTR;
1648 }
1649 }
1650
1651 return ret;
1652 }
1653
1654 #ifdef HAVE_SET_RESTORE_SIGMASK
1655 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1656 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1657 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1658 compat_size_t sigsetsize)
1659 {
1660 compat_sigset_t ss32;
1661 sigset_t ksigmask, sigsaved;
1662 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1663 struct compat_timespec ts;
1664 int ret;
1665
1666 if (tsp) {
1667 if (copy_from_user(&ts, tsp, sizeof(ts)))
1668 return -EFAULT;
1669
1670 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1671 return -EINVAL;
1672 }
1673
1674 if (sigmask) {
1675 if (sigsetsize != sizeof(compat_sigset_t))
1676 return -EINVAL;
1677 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1678 return -EFAULT;
1679 sigset_from_compat(&ksigmask, &ss32);
1680
1681 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1682 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1683 }
1684
1685 do {
1686 if (tsp) {
1687 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1688 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1689 timeout += ts.tv_sec * (unsigned long)HZ;
1690 ts.tv_sec = 0;
1691 ts.tv_nsec = 0;
1692 } else {
1693 ts.tv_sec -= MAX_SELECT_SECONDS;
1694 timeout = MAX_SELECT_SECONDS * HZ;
1695 }
1696 }
1697
1698 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1699
1700 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1701
1702 if (tsp) {
1703 struct compat_timespec rts;
1704
1705 if (current->personality & STICKY_TIMEOUTS)
1706 goto sticky;
1707
1708 rts.tv_sec = timeout / HZ;
1709 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1710 if (rts.tv_nsec >= NSEC_PER_SEC) {
1711 rts.tv_sec++;
1712 rts.tv_nsec -= NSEC_PER_SEC;
1713 }
1714 if (compat_timespec_compare(&rts, &ts) >= 0)
1715 rts = ts;
1716 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1717 sticky:
1718 /*
1719 * If an application puts its timeval in read-only
1720 * memory, we don't want the Linux-specific update to
1721 * the timeval to cause a fault after the select has
1722 * completed successfully. However, because we're not
1723 * updating the timeval, we can't restart the system
1724 * call.
1725 */
1726 if (ret == -ERESTARTNOHAND)
1727 ret = -EINTR;
1728 }
1729 }
1730
1731 if (ret == -ERESTARTNOHAND) {
1732 /*
1733 * Don't restore the signal mask yet. Let do_signal() deliver
1734 * the signal on the way back to userspace, before the signal
1735 * mask is restored.
1736 */
1737 if (sigmask) {
1738 memcpy(&current->saved_sigmask, &sigsaved,
1739 sizeof(sigsaved));
1740 set_restore_sigmask();
1741 }
1742 } else if (sigmask)
1743 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1744
1745 return ret;
1746 }
1747
1748 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1749 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1750 struct compat_timespec __user *tsp, void __user *sig)
1751 {
1752 compat_size_t sigsetsize = 0;
1753 compat_uptr_t up = 0;
1754
1755 if (sig) {
1756 if (!access_ok(VERIFY_READ, sig,
1757 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1758 __get_user(up, (compat_uptr_t __user *)sig) ||
1759 __get_user(sigsetsize,
1760 (compat_size_t __user *)(sig+sizeof(up))))
1761 return -EFAULT;
1762 }
1763 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1764 sigsetsize);
1765 }
1766
1767 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1768 unsigned int nfds, struct compat_timespec __user *tsp,
1769 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1770 {
1771 compat_sigset_t ss32;
1772 sigset_t ksigmask, sigsaved;
1773 struct compat_timespec ts;
1774 s64 timeout = -1;
1775 int ret;
1776
1777 if (tsp) {
1778 if (copy_from_user(&ts, tsp, sizeof(ts)))
1779 return -EFAULT;
1780
1781 /* We assume that ts.tv_sec is always lower than
1782 the number of seconds that can be expressed in
1783 an s64. Otherwise the compiler bitches at us */
1784 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1785 timeout += ts.tv_sec * HZ;
1786 }
1787
1788 if (sigmask) {
1789 if (sigsetsize != sizeof(compat_sigset_t))
1790 return -EINVAL;
1791 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1792 return -EFAULT;
1793 sigset_from_compat(&ksigmask, &ss32);
1794
1795 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1796 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1797 }
1798
1799 ret = do_sys_poll(ufds, nfds, &timeout);
1800
1801 /* We can restart this syscall, usually */
1802 if (ret == -EINTR) {
1803 /*
1804 * Don't restore the signal mask yet. Let do_signal() deliver
1805 * the signal on the way back to userspace, before the signal
1806 * mask is restored.
1807 */
1808 if (sigmask) {
1809 memcpy(&current->saved_sigmask, &sigsaved,
1810 sizeof(sigsaved));
1811 set_restore_sigmask();
1812 }
1813 ret = -ERESTARTNOHAND;
1814 } else if (sigmask)
1815 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1816
1817 if (tsp && timeout >= 0) {
1818 struct compat_timespec rts;
1819
1820 if (current->personality & STICKY_TIMEOUTS)
1821 goto sticky;
1822 /* Yes, we know it's actually an s64, but it's also positive. */
1823 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1824 1000;
1825 rts.tv_sec = timeout;
1826 if (compat_timespec_compare(&rts, &ts) >= 0)
1827 rts = ts;
1828 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1829 sticky:
1830 /*
1831 * If an application puts its timeval in read-only
1832 * memory, we don't want the Linux-specific update to
1833 * the timeval to cause a fault after the select has
1834 * completed successfully. However, because we're not
1835 * updating the timeval, we can't restart the system
1836 * call.
1837 */
1838 if (ret == -ERESTARTNOHAND && timeout >= 0)
1839 ret = -EINTR;
1840 }
1841 }
1842
1843 return ret;
1844 }
1845 #endif /* HAVE_SET_RESTORE_SIGMASK */
1846
1847 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1848 /* Stuff for NFS server syscalls... */
1849 struct compat_nfsctl_svc {
1850 u16 svc32_port;
1851 s32 svc32_nthreads;
1852 };
1853
1854 struct compat_nfsctl_client {
1855 s8 cl32_ident[NFSCLNT_IDMAX+1];
1856 s32 cl32_naddr;
1857 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1858 s32 cl32_fhkeytype;
1859 s32 cl32_fhkeylen;
1860 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1861 };
1862
1863 struct compat_nfsctl_export {
1864 char ex32_client[NFSCLNT_IDMAX+1];
1865 char ex32_path[NFS_MAXPATHLEN+1];
1866 compat_dev_t ex32_dev;
1867 compat_ino_t ex32_ino;
1868 compat_int_t ex32_flags;
1869 __compat_uid_t ex32_anon_uid;
1870 __compat_gid_t ex32_anon_gid;
1871 };
1872
1873 struct compat_nfsctl_fdparm {
1874 struct sockaddr gd32_addr;
1875 s8 gd32_path[NFS_MAXPATHLEN+1];
1876 compat_int_t gd32_version;
1877 };
1878
1879 struct compat_nfsctl_fsparm {
1880 struct sockaddr gd32_addr;
1881 s8 gd32_path[NFS_MAXPATHLEN+1];
1882 compat_int_t gd32_maxlen;
1883 };
1884
1885 struct compat_nfsctl_arg {
1886 compat_int_t ca32_version; /* safeguard */
1887 union {
1888 struct compat_nfsctl_svc u32_svc;
1889 struct compat_nfsctl_client u32_client;
1890 struct compat_nfsctl_export u32_export;
1891 struct compat_nfsctl_fdparm u32_getfd;
1892 struct compat_nfsctl_fsparm u32_getfs;
1893 } u;
1894 #define ca32_svc u.u32_svc
1895 #define ca32_client u.u32_client
1896 #define ca32_export u.u32_export
1897 #define ca32_getfd u.u32_getfd
1898 #define ca32_getfs u.u32_getfs
1899 };
1900
1901 union compat_nfsctl_res {
1902 __u8 cr32_getfh[NFS_FHSIZE];
1903 struct knfsd_fh cr32_getfs;
1904 };
1905
1906 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1907 struct compat_nfsctl_arg __user *arg)
1908 {
1909 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1910 get_user(karg->ca_version, &arg->ca32_version) ||
1911 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1912 __get_user(karg->ca_svc.svc_nthreads,
1913 &arg->ca32_svc.svc32_nthreads))
1914 return -EFAULT;
1915 return 0;
1916 }
1917
1918 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1919 struct compat_nfsctl_arg __user *arg)
1920 {
1921 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1922 sizeof(arg->ca32_client)) ||
1923 get_user(karg->ca_version, &arg->ca32_version) ||
1924 __copy_from_user(&karg->ca_client.cl_ident[0],
1925 &arg->ca32_client.cl32_ident[0],
1926 NFSCLNT_IDMAX) ||
1927 __get_user(karg->ca_client.cl_naddr,
1928 &arg->ca32_client.cl32_naddr) ||
1929 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1930 &arg->ca32_client.cl32_addrlist[0],
1931 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1932 __get_user(karg->ca_client.cl_fhkeytype,
1933 &arg->ca32_client.cl32_fhkeytype) ||
1934 __get_user(karg->ca_client.cl_fhkeylen,
1935 &arg->ca32_client.cl32_fhkeylen) ||
1936 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1937 &arg->ca32_client.cl32_fhkey[0],
1938 NFSCLNT_KEYMAX))
1939 return -EFAULT;
1940
1941 return 0;
1942 }
1943
1944 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1945 struct compat_nfsctl_arg __user *arg)
1946 {
1947 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1948 sizeof(arg->ca32_export)) ||
1949 get_user(karg->ca_version, &arg->ca32_version) ||
1950 __copy_from_user(&karg->ca_export.ex_client[0],
1951 &arg->ca32_export.ex32_client[0],
1952 NFSCLNT_IDMAX) ||
1953 __copy_from_user(&karg->ca_export.ex_path[0],
1954 &arg->ca32_export.ex32_path[0],
1955 NFS_MAXPATHLEN) ||
1956 __get_user(karg->ca_export.ex_dev,
1957 &arg->ca32_export.ex32_dev) ||
1958 __get_user(karg->ca_export.ex_ino,
1959 &arg->ca32_export.ex32_ino) ||
1960 __get_user(karg->ca_export.ex_flags,
1961 &arg->ca32_export.ex32_flags) ||
1962 __get_user(karg->ca_export.ex_anon_uid,
1963 &arg->ca32_export.ex32_anon_uid) ||
1964 __get_user(karg->ca_export.ex_anon_gid,
1965 &arg->ca32_export.ex32_anon_gid))
1966 return -EFAULT;
1967 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1968 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1969
1970 return 0;
1971 }
1972
1973 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1974 struct compat_nfsctl_arg __user *arg)
1975 {
1976 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1977 sizeof(arg->ca32_getfd)) ||
1978 get_user(karg->ca_version, &arg->ca32_version) ||
1979 __copy_from_user(&karg->ca_getfd.gd_addr,
1980 &arg->ca32_getfd.gd32_addr,
1981 (sizeof(struct sockaddr))) ||
1982 __copy_from_user(&karg->ca_getfd.gd_path,
1983 &arg->ca32_getfd.gd32_path,
1984 (NFS_MAXPATHLEN+1)) ||
1985 __get_user(karg->ca_getfd.gd_version,
1986 &arg->ca32_getfd.gd32_version))
1987 return -EFAULT;
1988
1989 return 0;
1990 }
1991
1992 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1993 struct compat_nfsctl_arg __user *arg)
1994 {
1995 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1996 get_user(karg->ca_version, &arg->ca32_version) ||
1997 __copy_from_user(&karg->ca_getfs.gd_addr,
1998 &arg->ca32_getfs.gd32_addr,
1999 (sizeof(struct sockaddr))) ||
2000 __copy_from_user(&karg->ca_getfs.gd_path,
2001 &arg->ca32_getfs.gd32_path,
2002 (NFS_MAXPATHLEN+1)) ||
2003 __get_user(karg->ca_getfs.gd_maxlen,
2004 &arg->ca32_getfs.gd32_maxlen))
2005 return -EFAULT;
2006
2007 return 0;
2008 }
2009
2010 /* This really doesn't need translations, we are only passing
2011 * back a union which contains opaque nfs file handle data.
2012 */
2013 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2014 union compat_nfsctl_res __user *res)
2015 {
2016 int err;
2017
2018 err = copy_to_user(res, kres, sizeof(*res));
2019
2020 return (err) ? -EFAULT : 0;
2021 }
2022
2023 asmlinkage long compat_sys_nfsservctl(int cmd,
2024 struct compat_nfsctl_arg __user *arg,
2025 union compat_nfsctl_res __user *res)
2026 {
2027 struct nfsctl_arg *karg;
2028 union nfsctl_res *kres;
2029 mm_segment_t oldfs;
2030 int err;
2031
2032 karg = kmalloc(sizeof(*karg), GFP_USER);
2033 kres = kmalloc(sizeof(*kres), GFP_USER);
2034 if(!karg || !kres) {
2035 err = -ENOMEM;
2036 goto done;
2037 }
2038
2039 switch(cmd) {
2040 case NFSCTL_SVC:
2041 err = compat_nfs_svc_trans(karg, arg);
2042 break;
2043
2044 case NFSCTL_ADDCLIENT:
2045 err = compat_nfs_clnt_trans(karg, arg);
2046 break;
2047
2048 case NFSCTL_DELCLIENT:
2049 err = compat_nfs_clnt_trans(karg, arg);
2050 break;
2051
2052 case NFSCTL_EXPORT:
2053 case NFSCTL_UNEXPORT:
2054 err = compat_nfs_exp_trans(karg, arg);
2055 break;
2056
2057 case NFSCTL_GETFD:
2058 err = compat_nfs_getfd_trans(karg, arg);
2059 break;
2060
2061 case NFSCTL_GETFS:
2062 err = compat_nfs_getfs_trans(karg, arg);
2063 break;
2064
2065 default:
2066 err = -EINVAL;
2067 break;
2068 }
2069
2070 if (err)
2071 goto done;
2072
2073 oldfs = get_fs();
2074 set_fs(KERNEL_DS);
2075 /* The __user pointer casts are valid because of the set_fs() */
2076 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2077 set_fs(oldfs);
2078
2079 if (err)
2080 goto done;
2081
2082 if((cmd == NFSCTL_GETFD) ||
2083 (cmd == NFSCTL_GETFS))
2084 err = compat_nfs_getfh_res_trans(kres, res);
2085
2086 done:
2087 kfree(karg);
2088 kfree(kres);
2089 return err;
2090 }
2091 #else /* !NFSD */
2092 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2093 {
2094 return sys_ni_syscall();
2095 }
2096 #endif
2097
2098 #ifdef CONFIG_EPOLL
2099
2100 #ifdef HAVE_SET_RESTORE_SIGMASK
2101 asmlinkage long compat_sys_epoll_pwait(int epfd,
2102 struct compat_epoll_event __user *events,
2103 int maxevents, int timeout,
2104 const compat_sigset_t __user *sigmask,
2105 compat_size_t sigsetsize)
2106 {
2107 long err;
2108 compat_sigset_t csigmask;
2109 sigset_t ksigmask, sigsaved;
2110
2111 /*
2112 * If the caller wants a certain signal mask to be set during the wait,
2113 * we apply it here.
2114 */
2115 if (sigmask) {
2116 if (sigsetsize != sizeof(compat_sigset_t))
2117 return -EINVAL;
2118 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2119 return -EFAULT;
2120 sigset_from_compat(&ksigmask, &csigmask);
2121 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2122 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2123 }
2124
2125 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2126
2127 /*
2128 * If we changed the signal mask, we need to restore the original one.
2129 * In case we've got a signal while waiting, we do not restore the
2130 * signal mask yet, and we allow do_signal() to deliver the signal on
2131 * the way back to userspace, before the signal mask is restored.
2132 */
2133 if (sigmask) {
2134 if (err == -EINTR) {
2135 memcpy(&current->saved_sigmask, &sigsaved,
2136 sizeof(sigsaved));
2137 set_restore_sigmask();
2138 } else
2139 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2140 }
2141
2142 return err;
2143 }
2144 #endif /* HAVE_SET_RESTORE_SIGMASK */
2145
2146 #endif /* CONFIG_EPOLL */
2147
2148 #ifdef CONFIG_SIGNALFD
2149
2150 asmlinkage long compat_sys_signalfd4(int ufd,
2151 const compat_sigset_t __user *sigmask,
2152 compat_size_t sigsetsize, int flags)
2153 {
2154 compat_sigset_t ss32;
2155 sigset_t tmp;
2156 sigset_t __user *ksigmask;
2157
2158 if (sigsetsize != sizeof(compat_sigset_t))
2159 return -EINVAL;
2160 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2161 return -EFAULT;
2162 sigset_from_compat(&tmp, &ss32);
2163 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2164 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2165 return -EFAULT;
2166
2167 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2168 }
2169
2170 asmlinkage long compat_sys_signalfd(int ufd,
2171 const compat_sigset_t __user *sigmask,
2172 compat_size_t sigsetsize)
2173 {
2174 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2175 }
2176 #endif /* CONFIG_SIGNALFD */
2177
2178 #ifdef CONFIG_TIMERFD
2179
2180 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2181 const struct compat_itimerspec __user *utmr,
2182 struct compat_itimerspec __user *otmr)
2183 {
2184 int error;
2185 struct itimerspec t;
2186 struct itimerspec __user *ut;
2187
2188 if (get_compat_itimerspec(&t, utmr))
2189 return -EFAULT;
2190 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2191 if (copy_to_user(&ut[0], &t, sizeof(t)))
2192 return -EFAULT;
2193 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2194 if (!error && otmr)
2195 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2196 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2197
2198 return error;
2199 }
2200
2201 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2202 struct compat_itimerspec __user *otmr)
2203 {
2204 int error;
2205 struct itimerspec t;
2206 struct itimerspec __user *ut;
2207
2208 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2209 error = sys_timerfd_gettime(ufd, ut);
2210 if (!error)
2211 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2212 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2213
2214 return error;
2215 }
2216
2217 #endif /* CONFIG_TIMERFD */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree