?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
KVM: SVM: disable CR8 intercept when tpr is not masking interrupts
[linux-2.6/zen-sources.git] / fs / compat.c
blob2ce4456aad309eebc3df3c200178561046d87093
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
706 return 0;
707 }
708
709 #define SMBFS_NAME "smbfs"
710 #define NCPFS_NAME "ncpfs"
711 #define NFS4_NAME "nfs4"
712
713 asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
714 char __user * type, unsigned long flags,
715 void __user * data)
716 {
717 unsigned long type_page;
718 unsigned long data_page;
719 unsigned long dev_page;
720 char *dir_page;
721 int retval;
722
723 retval = copy_mount_options (type, &type_page);
724 if (retval < 0)
725 goto out;
726
727 dir_page = getname(dir_name);
728 retval = PTR_ERR(dir_page);
729 if (IS_ERR(dir_page))
730 goto out1;
731
732 retval = copy_mount_options (dev_name, &dev_page);
733 if (retval < 0)
734 goto out2;
735
736 retval = copy_mount_options (data, &data_page);
737 if (retval < 0)
738 goto out3;
739
740 retval = -EINVAL;
741
742 if (type_page && data_page) {
743 if (!strcmp((char *)type_page, SMBFS_NAME)) {
744 do_smb_super_data_conv((void *)data_page);
745 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
746 do_ncp_super_data_conv((void *)data_page);
747 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
748 if (do_nfs4_super_data_conv((void *) data_page))
749 goto out4;
750 }
751 }
752
753 lock_kernel();
754 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
755 flags, (void*)data_page);
756 unlock_kernel();
757
758 out4:
759 free_page(data_page);
760 out3:
761 free_page(dev_page);
762 out2:
763 putname(dir_page);
764 out1:
765 free_page(type_page);
766 out:
767 return retval;
768 }
769
770 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
771
772 struct compat_old_linux_dirent {
773 compat_ulong_t d_ino;
774 compat_ulong_t d_offset;
775 unsigned short d_namlen;
776 char d_name[1];
777 };
778
779 struct compat_readdir_callback {
780 struct compat_old_linux_dirent __user *dirent;
781 int result;
782 };
783
784 static int compat_fillonedir(void *__buf, const char *name, int namlen,
785 loff_t offset, u64 ino, unsigned int d_type)
786 {
787 struct compat_readdir_callback *buf = __buf;
788 struct compat_old_linux_dirent __user *dirent;
789 compat_ulong_t d_ino;
790
791 if (buf->result)
792 return -EINVAL;
793 d_ino = ino;
794 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
795 return -EOVERFLOW;
796 buf->result++;
797 dirent = buf->dirent;
798 if (!access_ok(VERIFY_WRITE, dirent,
799 (unsigned long)(dirent->d_name + namlen + 1) -
800 (unsigned long)dirent))
801 goto efault;
802 if ( __put_user(d_ino, &dirent->d_ino) ||
803 __put_user(offset, &dirent->d_offset) ||
804 __put_user(namlen, &dirent->d_namlen) ||
805 __copy_to_user(dirent->d_name, name, namlen) ||
806 __put_user(0, dirent->d_name + namlen))
807 goto efault;
808 return 0;
809 efault:
810 buf->result = -EFAULT;
811 return -EFAULT;
812 }
813
814 asmlinkage long compat_sys_old_readdir(unsigned int fd,
815 struct compat_old_linux_dirent __user *dirent, unsigned int count)
816 {
817 int error;
818 struct file *file;
819 struct compat_readdir_callback buf;
820
821 error = -EBADF;
822 file = fget(fd);
823 if (!file)
824 goto out;
825
826 buf.result = 0;
827 buf.dirent = dirent;
828
829 error = vfs_readdir(file, compat_fillonedir, &buf);
830 if (error >= 0)
831 error = buf.result;
832
833 fput(file);
834 out:
835 return error;
836 }
837
838 struct compat_linux_dirent {
839 compat_ulong_t d_ino;
840 compat_ulong_t d_off;
841 unsigned short d_reclen;
842 char d_name[1];
843 };
844
845 struct compat_getdents_callback {
846 struct compat_linux_dirent __user *current_dir;
847 struct compat_linux_dirent __user *previous;
848 int count;
849 int error;
850 };
851
852 static int compat_filldir(void *__buf, const char *name, int namlen,
853 loff_t offset, u64 ino, unsigned int d_type)
854 {
855 struct compat_linux_dirent __user * dirent;
856 struct compat_getdents_callback *buf = __buf;
857 compat_ulong_t d_ino;
858 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
859
860 buf->error = -EINVAL; /* only used if we fail.. */
861 if (reclen > buf->count)
862 return -EINVAL;
863 d_ino = ino;
864 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
865 return -EOVERFLOW;
866 dirent = buf->previous;
867 if (dirent) {
868 if (__put_user(offset, &dirent->d_off))
869 goto efault;
870 }
871 dirent = buf->current_dir;
872 if (__put_user(d_ino, &dirent->d_ino))
873 goto efault;
874 if (__put_user(reclen, &dirent->d_reclen))
875 goto efault;
876 if (copy_to_user(dirent->d_name, name, namlen))
877 goto efault;
878 if (__put_user(0, dirent->d_name + namlen))
879 goto efault;
880 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
881 goto efault;
882 buf->previous = dirent;
883 dirent = (void __user *)dirent + reclen;
884 buf->current_dir = dirent;
885 buf->count -= reclen;
886 return 0;
887 efault:
888 buf->error = -EFAULT;
889 return -EFAULT;
890 }
891
892 asmlinkage long compat_sys_getdents(unsigned int fd,
893 struct compat_linux_dirent __user *dirent, unsigned int count)
894 {
895 struct file * file;
896 struct compat_linux_dirent __user * lastdirent;
897 struct compat_getdents_callback buf;
898 int error;
899
900 error = -EFAULT;
901 if (!access_ok(VERIFY_WRITE, dirent, count))
902 goto out;
903
904 error = -EBADF;
905 file = fget(fd);
906 if (!file)
907 goto out;
908
909 buf.current_dir = dirent;
910 buf.previous = NULL;
911 buf.count = count;
912 buf.error = 0;
913
914 error = vfs_readdir(file, compat_filldir, &buf);
915 if (error < 0)
916 goto out_putf;
917 error = buf.error;
918 lastdirent = buf.previous;
919 if (lastdirent) {
920 if (put_user(file->f_pos, &lastdirent->d_off))
921 error = -EFAULT;
922 else
923 error = count - buf.count;
924 }
925
926 out_putf:
927 fput(file);
928 out:
929 return error;
930 }
931
932 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
933
934 struct compat_getdents_callback64 {
935 struct linux_dirent64 __user *current_dir;
936 struct linux_dirent64 __user *previous;
937 int count;
938 int error;
939 };
940
941 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
942 u64 ino, unsigned int d_type)
943 {
944 struct linux_dirent64 __user *dirent;
945 struct compat_getdents_callback64 *buf = __buf;
946 int jj = NAME_OFFSET(dirent);
947 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
948 u64 off;
949
950 buf->error = -EINVAL; /* only used if we fail.. */
951 if (reclen > buf->count)
952 return -EINVAL;
953 dirent = buf->previous;
954
955 if (dirent) {
956 if (__put_user_unaligned(offset, &dirent->d_off))
957 goto efault;
958 }
959 dirent = buf->current_dir;
960 if (__put_user_unaligned(ino, &dirent->d_ino))
961 goto efault;
962 off = 0;
963 if (__put_user_unaligned(off, &dirent->d_off))
964 goto efault;
965 if (__put_user(reclen, &dirent->d_reclen))
966 goto efault;
967 if (__put_user(d_type, &dirent->d_type))
968 goto efault;
969 if (copy_to_user(dirent->d_name, name, namlen))
970 goto efault;
971 if (__put_user(0, dirent->d_name + namlen))
972 goto efault;
973 buf->previous = dirent;
974 dirent = (void __user *)dirent + reclen;
975 buf->current_dir = dirent;
976 buf->count -= reclen;
977 return 0;
978 efault:
979 buf->error = -EFAULT;
980 return -EFAULT;
981 }
982
983 asmlinkage long compat_sys_getdents64(unsigned int fd,
984 struct linux_dirent64 __user * dirent, unsigned int count)
985 {
986 struct file * file;
987 struct linux_dirent64 __user * lastdirent;
988 struct compat_getdents_callback64 buf;
989 int error;
990
991 error = -EFAULT;
992 if (!access_ok(VERIFY_WRITE, dirent, count))
993 goto out;
994
995 error = -EBADF;
996 file = fget(fd);
997 if (!file)
998 goto out;
999
1000 buf.current_dir = dirent;
1001 buf.previous = NULL;
1002 buf.count = count;
1003 buf.error = 0;
1004
1005 error = vfs_readdir(file, compat_filldir64, &buf);
1006 if (error < 0)
1007 goto out_putf;
1008 error = buf.error;
1009 lastdirent = buf.previous;
1010 if (lastdirent) {
1011 typeof(lastdirent->d_off) d_off = file->f_pos;
1012 error = -EFAULT;
1013 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1014 goto out_putf;
1015 error = count - buf.count;
1016 }
1017
1018 out_putf:
1019 fput(file);
1020 out:
1021 return error;
1022 }
1023 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1024
1025 static ssize_t compat_do_readv_writev(int type, struct file *file,
1026 const struct compat_iovec __user *uvector,
1027 unsigned long nr_segs, loff_t *pos)
1028 {
1029 compat_ssize_t tot_len;
1030 struct iovec iovstack[UIO_FASTIOV];
1031 struct iovec *iov=iovstack, *vector;
1032 ssize_t ret;
1033 int seg;
1034 io_fn_t fn;
1035 iov_fn_t fnv;
1036
1037 /*
1038 * SuS says "The readv() function *may* fail if the iovcnt argument
1039 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1040 * traditionally returned zero for zero segments, so...
1041 */
1042 ret = 0;
1043 if (nr_segs == 0)
1044 goto out;
1045
1046 /*
1047 * First get the "struct iovec" from user memory and
1048 * verify all the pointers
1049 */
1050 ret = -EINVAL;
1051 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1052 goto out;
1053 if (!file->f_op)
1054 goto out;
1055 if (nr_segs > UIO_FASTIOV) {
1056 ret = -ENOMEM;
1057 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1058 if (!iov)
1059 goto out;
1060 }
1061 ret = -EFAULT;
1062 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1063 goto out;
1064
1065 /*
1066 * Single unix specification:
1067 * We should -EINVAL if an element length is not >= 0 and fitting an
1068 * ssize_t. The total length is fitting an ssize_t
1069 *
1070 * Be careful here because iov_len is a size_t not an ssize_t
1071 */
1072 tot_len = 0;
1073 vector = iov;
1074 ret = -EINVAL;
1075 for (seg = 0 ; seg < nr_segs; seg++) {
1076 compat_ssize_t tmp = tot_len;
1077 compat_ssize_t len;
1078 compat_uptr_t buf;
1079
1080 if (__get_user(len, &uvector->iov_len) ||
1081 __get_user(buf, &uvector->iov_base)) {
1082 ret = -EFAULT;
1083 goto out;
1084 }
1085 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1086 goto out;
1087 tot_len += len;
1088 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1089 goto out;
1090 vector->iov_base = compat_ptr(buf);
1091 vector->iov_len = (compat_size_t) len;
1092 uvector++;
1093 vector++;
1094 }
1095 if (tot_len == 0) {
1096 ret = 0;
1097 goto out;
1098 }
1099
1100 ret = rw_verify_area(type, file, pos, tot_len);
1101 if (ret < 0)
1102 goto out;
1103
1104 fnv = NULL;
1105 if (type == READ) {
1106 fn = file->f_op->read;
1107 fnv = file->f_op->aio_read;
1108 } else {
1109 fn = (io_fn_t)file->f_op->write;
1110 fnv = file->f_op->aio_write;
1111 }
1112
1113 if (fnv)
1114 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1115 pos, fnv);
1116 else
1117 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1118
1119 out:
1120 if (iov != iovstack)
1121 kfree(iov);
1122 if ((ret + (type == READ)) > 0) {
1123 struct dentry *dentry = file->f_path.dentry;
1124 if (type == READ)
1125 fsnotify_access(dentry);
1126 else
1127 fsnotify_modify(dentry);
1128 }
1129 return ret;
1130 }
1131
1132 asmlinkage ssize_t
1133 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1134 {
1135 struct file *file;
1136 ssize_t ret = -EBADF;
1137
1138 file = fget(fd);
1139 if (!file)
1140 return -EBADF;
1141
1142 if (!(file->f_mode & FMODE_READ))
1143 goto out;
1144
1145 ret = -EINVAL;
1146 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1147 goto out;
1148
1149 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1150
1151 out:
1152 fput(file);
1153 return ret;
1154 }
1155
1156 asmlinkage ssize_t
1157 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1158 {
1159 struct file *file;
1160 ssize_t ret = -EBADF;
1161
1162 file = fget(fd);
1163 if (!file)
1164 return -EBADF;
1165 if (!(file->f_mode & FMODE_WRITE))
1166 goto out;
1167
1168 ret = -EINVAL;
1169 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1170 goto out;
1171
1172 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1173
1174 out:
1175 fput(file);
1176 return ret;
1177 }
1178
1179 asmlinkage long
1180 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1181 unsigned int nr_segs, unsigned int flags)
1182 {
1183 unsigned i;
1184 struct iovec __user *iov;
1185 if (nr_segs > UIO_MAXIOV)
1186 return -EINVAL;
1187 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1188 for (i = 0; i < nr_segs; i++) {
1189 struct compat_iovec v;
1190 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1191 get_user(v.iov_len, &iov32[i].iov_len) ||
1192 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1193 put_user(v.iov_len, &iov[i].iov_len))
1194 return -EFAULT;
1195 }
1196 return sys_vmsplice(fd, iov, nr_segs, flags);
1197 }
1198
1199 /*
1200 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1201 * O_LARGEFILE flag.
1202 */
1203 asmlinkage long
1204 compat_sys_open(const char __user *filename, int flags, int mode)
1205 {
1206 return do_sys_open(AT_FDCWD, filename, flags, mode);
1207 }
1208
1209 /*
1210 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1211 * O_LARGEFILE flag.
1212 */
1213 asmlinkage long
1214 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1215 {
1216 return do_sys_open(dfd, filename, flags, mode);
1217 }
1218
1219 /*
1220 * compat_count() counts the number of arguments/envelopes. It is basically
1221 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1222 * and envp pointers.
1223 */
1224 static int compat_count(compat_uptr_t __user *argv, int max)
1225 {
1226 int i = 0;
1227
1228 if (argv != NULL) {
1229 for (;;) {
1230 compat_uptr_t p;
1231
1232 if (get_user(p, argv))
1233 return -EFAULT;
1234 if (!p)
1235 break;
1236 argv++;
1237 if(++i > max)
1238 return -E2BIG;
1239 }
1240 }
1241 return i;
1242 }
1243
1244 /*
1245 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1246 * except that it works with 32 bit argv and envp pointers.
1247 */
1248 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1249 struct linux_binprm *bprm)
1250 {
1251 struct page *kmapped_page = NULL;
1252 char *kaddr = NULL;
1253 unsigned long kpos = 0;
1254 int ret;
1255
1256 while (argc-- > 0) {
1257 compat_uptr_t str;
1258 int len;
1259 unsigned long pos;
1260
1261 if (get_user(str, argv+argc) ||
1262 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1263 ret = -EFAULT;
1264 goto out;
1265 }
1266
1267 if (len > MAX_ARG_STRLEN) {
1268 ret = -E2BIG;
1269 goto out;
1270 }
1271
1272 /* We're going to work our way backwords. */
1273 pos = bprm->p;
1274 str += len;
1275 bprm->p -= len;
1276
1277 while (len > 0) {
1278 int offset, bytes_to_copy;
1279
1280 offset = pos % PAGE_SIZE;
1281 if (offset == 0)
1282 offset = PAGE_SIZE;
1283
1284 bytes_to_copy = offset;
1285 if (bytes_to_copy > len)
1286 bytes_to_copy = len;
1287
1288 offset -= bytes_to_copy;
1289 pos -= bytes_to_copy;
1290 str -= bytes_to_copy;
1291 len -= bytes_to_copy;
1292
1293 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1294 struct page *page;
1295
1296 #ifdef CONFIG_STACK_GROWSUP
1297 ret = expand_stack_downwards(bprm->vma, pos);
1298 if (ret < 0) {
1299 /* We've exceed the stack rlimit. */
1300 ret = -E2BIG;
1301 goto out;
1302 }
1303 #endif
1304 ret = get_user_pages(current, bprm->mm, pos,
1305 1, 1, 1, &page, NULL);
1306 if (ret <= 0) {
1307 /* We've exceed the stack rlimit. */
1308 ret = -E2BIG;
1309 goto out;
1310 }
1311
1312 if (kmapped_page) {
1313 flush_kernel_dcache_page(kmapped_page);
1314 kunmap(kmapped_page);
1315 put_page(kmapped_page);
1316 }
1317 kmapped_page = page;
1318 kaddr = kmap(kmapped_page);
1319 kpos = pos & PAGE_MASK;
1320 flush_cache_page(bprm->vma, kpos,
1321 page_to_pfn(kmapped_page));
1322 }
1323 if (copy_from_user(kaddr+offset, compat_ptr(str),
1324 bytes_to_copy)) {
1325 ret = -EFAULT;
1326 goto out;
1327 }
1328 }
1329 }
1330 ret = 0;
1331 out:
1332 if (kmapped_page) {
1333 flush_kernel_dcache_page(kmapped_page);
1334 kunmap(kmapped_page);
1335 put_page(kmapped_page);
1336 }
1337 return ret;
1338 }
1339
1340 /*
1341 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1342 * that it processes 32 bit argv and envp pointers.
1343 */
1344 int compat_do_execve(char * filename,
1345 compat_uptr_t __user *argv,
1346 compat_uptr_t __user *envp,
1347 struct pt_regs * regs)
1348 {
1349 struct linux_binprm *bprm;
1350 struct file *file;
1351 int retval;
1352
1353 retval = -ENOMEM;
1354 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1355 if (!bprm)
1356 goto out_ret;
1357
1358 file = open_exec(filename);
1359 retval = PTR_ERR(file);
1360 if (IS_ERR(file))
1361 goto out_kfree;
1362
1363 sched_exec();
1364
1365 bprm->file = file;
1366 bprm->filename = filename;
1367 bprm->interp = filename;
1368
1369 retval = bprm_mm_init(bprm);
1370 if (retval)
1371 goto out_file;
1372
1373 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1374 if ((retval = bprm->argc) < 0)
1375 goto out_mm;
1376
1377 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1378 if ((retval = bprm->envc) < 0)
1379 goto out_mm;
1380
1381 retval = security_bprm_alloc(bprm);
1382 if (retval)
1383 goto out;
1384
1385 retval = prepare_binprm(bprm);
1386 if (retval < 0)
1387 goto out;
1388
1389 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1390 if (retval < 0)
1391 goto out;
1392
1393 bprm->exec = bprm->p;
1394 retval = compat_copy_strings(bprm->envc, envp, bprm);
1395 if (retval < 0)
1396 goto out;
1397
1398 retval = compat_copy_strings(bprm->argc, argv, bprm);
1399 if (retval < 0)
1400 goto out;
1401
1402 retval = search_binary_handler(bprm, regs);
1403 if (retval >= 0) {
1404 /* execve success */
1405 security_bprm_free(bprm);
1406 acct_update_integrals(current);
1407 kfree(bprm);
1408 return retval;
1409 }
1410
1411 out:
1412 if (bprm->security)
1413 security_bprm_free(bprm);
1414
1415 out_mm:
1416 if (bprm->mm)
1417 mmput(bprm->mm);
1418
1419 out_file:
1420 if (bprm->file) {
1421 allow_write_access(bprm->file);
1422 fput(bprm->file);
1423 }
1424
1425 out_kfree:
1426 kfree(bprm);
1427
1428 out_ret:
1429 return retval;
1430 }
1431
1432 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1433
1434 /*
1435 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1436 * 64-bit unsigned longs.
1437 */
1438 static
1439 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1440 unsigned long *fdset)
1441 {
1442 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1443 if (ufdset) {
1444 unsigned long odd;
1445
1446 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1447 return -EFAULT;
1448
1449 odd = nr & 1UL;
1450 nr &= ~1UL;
1451 while (nr) {
1452 unsigned long h, l;
1453 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1454 return -EFAULT;
1455 ufdset += 2;
1456 *fdset++ = h << 32 | l;
1457 nr -= 2;
1458 }
1459 if (odd && __get_user(*fdset, ufdset))
1460 return -EFAULT;
1461 } else {
1462 /* Tricky, must clear full unsigned long in the
1463 * kernel fdset at the end, this makes sure that
1464 * actually happens.
1465 */
1466 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1467 }
1468 return 0;
1469 }
1470
1471 static
1472 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1473 unsigned long *fdset)
1474 {
1475 unsigned long odd;
1476 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1477
1478 if (!ufdset)
1479 return 0;
1480
1481 odd = nr & 1UL;
1482 nr &= ~1UL;
1483 while (nr) {
1484 unsigned long h, l;
1485 l = *fdset++;
1486 h = l >> 32;
1487 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1488 return -EFAULT;
1489 ufdset += 2;
1490 nr -= 2;
1491 }
1492 if (odd && __put_user(*fdset, ufdset))
1493 return -EFAULT;
1494 return 0;
1495 }
1496
1497
1498 /*
1499 * This is a virtual copy of sys_select from fs/select.c and probably
1500 * should be compared to it from time to time
1501 */
1502
1503 /*
1504 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1505 * like to be certain this leads to no problems. So I return
1506 * EINTR just for safety.
1507 *
1508 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1509 * I'm trying ERESTARTNOHAND which restart only when you want to.
1510 */
1511 #define MAX_SELECT_SECONDS \
1512 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1513
1514 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1515 compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
1516 {
1517 fd_set_bits fds;
1518 void *bits;
1519 int size, max_fds, ret = -EINVAL;
1520 struct fdtable *fdt;
1521 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1522
1523 if (n < 0)
1524 goto out_nofds;
1525
1526 /* max_fds can increase, so grab it once to avoid race */
1527 rcu_read_lock();
1528 fdt = files_fdtable(current->files);
1529 max_fds = fdt->max_fds;
1530 rcu_read_unlock();
1531 if (n > max_fds)
1532 n = max_fds;
1533
1534 /*
1535 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1536 * since we used fdset we need to allocate memory in units of
1537 * long-words.
1538 */
1539 size = FDS_BYTES(n);
1540 bits = stack_fds;
1541 if (size > sizeof(stack_fds) / 6) {
1542 bits = kmalloc(6 * size, GFP_KERNEL);
1543 ret = -ENOMEM;
1544 if (!bits)
1545 goto out_nofds;
1546 }
1547 fds.in = (unsigned long *) bits;
1548 fds.out = (unsigned long *) (bits + size);
1549 fds.ex = (unsigned long *) (bits + 2*size);
1550 fds.res_in = (unsigned long *) (bits + 3*size);
1551 fds.res_out = (unsigned long *) (bits + 4*size);
1552 fds.res_ex = (unsigned long *) (bits + 5*size);
1553
1554 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1555 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1556 (ret = compat_get_fd_set(n, exp, fds.ex)))
1557 goto out;
1558 zero_fd_set(n, fds.res_in);
1559 zero_fd_set(n, fds.res_out);
1560 zero_fd_set(n, fds.res_ex);
1561
1562 ret = do_select(n, &fds, timeout);
1563
1564 if (ret < 0)
1565 goto out;
1566 if (!ret) {
1567 ret = -ERESTARTNOHAND;
1568 if (signal_pending(current))
1569 goto out;
1570 ret = 0;
1571 }
1572
1573 if (compat_set_fd_set(n, inp, fds.res_in) ||
1574 compat_set_fd_set(n, outp, fds.res_out) ||
1575 compat_set_fd_set(n, exp, fds.res_ex))
1576 ret = -EFAULT;
1577 out:
1578 if (bits != stack_fds)
1579 kfree(bits);
1580 out_nofds:
1581 return ret;
1582 }
1583
1584 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1585 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1586 struct compat_timeval __user *tvp)
1587 {
1588 s64 timeout = -1;
1589 struct compat_timeval tv;
1590 int ret;
1591
1592 if (tvp) {
1593 if (copy_from_user(&tv, tvp, sizeof(tv)))
1594 return -EFAULT;
1595
1596 if (tv.tv_sec < 0 || tv.tv_usec < 0)
1597 return -EINVAL;
1598
1599 /* Cast to u64 to make GCC stop complaining */
1600 if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
1601 timeout = -1; /* infinite */
1602 else {
1603 timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
1604 timeout += tv.tv_sec * HZ;
1605 }
1606 }
1607
1608 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1609
1610 if (tvp) {
1611 struct compat_timeval rtv;
1612
1613 if (current->personality & STICKY_TIMEOUTS)
1614 goto sticky;
1615 rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
1616 rtv.tv_sec = timeout;
1617 if (compat_timeval_compare(&rtv, &tv) >= 0)
1618 rtv = tv;
1619 if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
1620 sticky:
1621 /*
1622 * If an application puts its timeval in read-only
1623 * memory, we don't want the Linux-specific update to
1624 * the timeval to cause a fault after the select has
1625 * completed successfully. However, because we're not
1626 * updating the timeval, we can't restart the system
1627 * call.
1628 */
1629 if (ret == -ERESTARTNOHAND)
1630 ret = -EINTR;
1631 }
1632 }
1633
1634 return ret;
1635 }
1636
1637 #ifdef TIF_RESTORE_SIGMASK
1638 asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
1639 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1640 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1641 compat_size_t sigsetsize)
1642 {
1643 compat_sigset_t ss32;
1644 sigset_t ksigmask, sigsaved;
1645 s64 timeout = MAX_SCHEDULE_TIMEOUT;
1646 struct compat_timespec ts;
1647 int ret;
1648
1649 if (tsp) {
1650 if (copy_from_user(&ts, tsp, sizeof(ts)))
1651 return -EFAULT;
1652
1653 if (ts.tv_sec < 0 || ts.tv_nsec < 0)
1654 return -EINVAL;
1655 }
1656
1657 if (sigmask) {
1658 if (sigsetsize != sizeof(compat_sigset_t))
1659 return -EINVAL;
1660 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1661 return -EFAULT;
1662 sigset_from_compat(&ksigmask, &ss32);
1663
1664 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1665 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1666 }
1667
1668 do {
1669 if (tsp) {
1670 if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
1671 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1672 timeout += ts.tv_sec * (unsigned long)HZ;
1673 ts.tv_sec = 0;
1674 ts.tv_nsec = 0;
1675 } else {
1676 ts.tv_sec -= MAX_SELECT_SECONDS;
1677 timeout = MAX_SELECT_SECONDS * HZ;
1678 }
1679 }
1680
1681 ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
1682
1683 } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
1684
1685 if (tsp) {
1686 struct compat_timespec rts;
1687
1688 if (current->personality & STICKY_TIMEOUTS)
1689 goto sticky;
1690
1691 rts.tv_sec = timeout / HZ;
1692 rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
1693 if (rts.tv_nsec >= NSEC_PER_SEC) {
1694 rts.tv_sec++;
1695 rts.tv_nsec -= NSEC_PER_SEC;
1696 }
1697 if (compat_timespec_compare(&rts, &ts) >= 0)
1698 rts = ts;
1699 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1700 sticky:
1701 /*
1702 * If an application puts its timeval in read-only
1703 * memory, we don't want the Linux-specific update to
1704 * the timeval to cause a fault after the select has
1705 * completed successfully. However, because we're not
1706 * updating the timeval, we can't restart the system
1707 * call.
1708 */
1709 if (ret == -ERESTARTNOHAND)
1710 ret = -EINTR;
1711 }
1712 }
1713
1714 if (ret == -ERESTARTNOHAND) {
1715 /*
1716 * Don't restore the signal mask yet. Let do_signal() deliver
1717 * the signal on the way back to userspace, before the signal
1718 * mask is restored.
1719 */
1720 if (sigmask) {
1721 memcpy(&current->saved_sigmask, &sigsaved,
1722 sizeof(sigsaved));
1723 set_thread_flag(TIF_RESTORE_SIGMASK);
1724 }
1725 } else if (sigmask)
1726 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1727
1728 return ret;
1729 }
1730
1731 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1732 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1733 struct compat_timespec __user *tsp, void __user *sig)
1734 {
1735 compat_size_t sigsetsize = 0;
1736 compat_uptr_t up = 0;
1737
1738 if (sig) {
1739 if (!access_ok(VERIFY_READ, sig,
1740 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1741 __get_user(up, (compat_uptr_t __user *)sig) ||
1742 __get_user(sigsetsize,
1743 (compat_size_t __user *)(sig+sizeof(up))))
1744 return -EFAULT;
1745 }
1746 return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
1747 sigsetsize);
1748 }
1749
1750 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1751 unsigned int nfds, struct compat_timespec __user *tsp,
1752 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1753 {
1754 compat_sigset_t ss32;
1755 sigset_t ksigmask, sigsaved;
1756 struct compat_timespec ts;
1757 s64 timeout = -1;
1758 int ret;
1759
1760 if (tsp) {
1761 if (copy_from_user(&ts, tsp, sizeof(ts)))
1762 return -EFAULT;
1763
1764 /* We assume that ts.tv_sec is always lower than
1765 the number of seconds that can be expressed in
1766 an s64. Otherwise the compiler bitches at us */
1767 timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
1768 timeout += ts.tv_sec * HZ;
1769 }
1770
1771 if (sigmask) {
1772 if (sigsetsize != sizeof(compat_sigset_t))
1773 return -EINVAL;
1774 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1775 return -EFAULT;
1776 sigset_from_compat(&ksigmask, &ss32);
1777
1778 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1779 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1780 }
1781
1782 ret = do_sys_poll(ufds, nfds, &timeout);
1783
1784 /* We can restart this syscall, usually */
1785 if (ret == -EINTR) {
1786 /*
1787 * Don't restore the signal mask yet. Let do_signal() deliver
1788 * the signal on the way back to userspace, before the signal
1789 * mask is restored.
1790 */
1791 if (sigmask) {
1792 memcpy(&current->saved_sigmask, &sigsaved,
1793 sizeof(sigsaved));
1794 set_thread_flag(TIF_RESTORE_SIGMASK);
1795 }
1796 ret = -ERESTARTNOHAND;
1797 } else if (sigmask)
1798 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1799
1800 if (tsp && timeout >= 0) {
1801 struct compat_timespec rts;
1802
1803 if (current->personality & STICKY_TIMEOUTS)
1804 goto sticky;
1805 /* Yes, we know it's actually an s64, but it's also positive. */
1806 rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1807 1000;
1808 rts.tv_sec = timeout;
1809 if (compat_timespec_compare(&rts, &ts) >= 0)
1810 rts = ts;
1811 if (copy_to_user(tsp, &rts, sizeof(rts))) {
1812 sticky:
1813 /*
1814 * If an application puts its timeval in read-only
1815 * memory, we don't want the Linux-specific update to
1816 * the timeval to cause a fault after the select has
1817 * completed successfully. However, because we're not
1818 * updating the timeval, we can't restart the system
1819 * call.
1820 */
1821 if (ret == -ERESTARTNOHAND && timeout >= 0)
1822 ret = -EINTR;
1823 }
1824 }
1825
1826 return ret;
1827 }
1828 #endif /* TIF_RESTORE_SIGMASK */
1829
1830 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1831 /* Stuff for NFS server syscalls... */
1832 struct compat_nfsctl_svc {
1833 u16 svc32_port;
1834 s32 svc32_nthreads;
1835 };
1836
1837 struct compat_nfsctl_client {
1838 s8 cl32_ident[NFSCLNT_IDMAX+1];
1839 s32 cl32_naddr;
1840 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1841 s32 cl32_fhkeytype;
1842 s32 cl32_fhkeylen;
1843 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1844 };
1845
1846 struct compat_nfsctl_export {
1847 char ex32_client[NFSCLNT_IDMAX+1];
1848 char ex32_path[NFS_MAXPATHLEN+1];
1849 compat_dev_t ex32_dev;
1850 compat_ino_t ex32_ino;
1851 compat_int_t ex32_flags;
1852 __compat_uid_t ex32_anon_uid;
1853 __compat_gid_t ex32_anon_gid;
1854 };
1855
1856 struct compat_nfsctl_fdparm {
1857 struct sockaddr gd32_addr;
1858 s8 gd32_path[NFS_MAXPATHLEN+1];
1859 compat_int_t gd32_version;
1860 };
1861
1862 struct compat_nfsctl_fsparm {
1863 struct sockaddr gd32_addr;
1864 s8 gd32_path[NFS_MAXPATHLEN+1];
1865 compat_int_t gd32_maxlen;
1866 };
1867
1868 struct compat_nfsctl_arg {
1869 compat_int_t ca32_version; /* safeguard */
1870 union {
1871 struct compat_nfsctl_svc u32_svc;
1872 struct compat_nfsctl_client u32_client;
1873 struct compat_nfsctl_export u32_export;
1874 struct compat_nfsctl_fdparm u32_getfd;
1875 struct compat_nfsctl_fsparm u32_getfs;
1876 } u;
1877 #define ca32_svc u.u32_svc
1878 #define ca32_client u.u32_client
1879 #define ca32_export u.u32_export
1880 #define ca32_getfd u.u32_getfd
1881 #define ca32_getfs u.u32_getfs
1882 };
1883
1884 union compat_nfsctl_res {
1885 __u8 cr32_getfh[NFS_FHSIZE];
1886 struct knfsd_fh cr32_getfs;
1887 };
1888
1889 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
1890 struct compat_nfsctl_arg __user *arg)
1891 {
1892 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
1893 get_user(karg->ca_version, &arg->ca32_version) ||
1894 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
1895 __get_user(karg->ca_svc.svc_nthreads,
1896 &arg->ca32_svc.svc32_nthreads))
1897 return -EFAULT;
1898 return 0;
1899 }
1900
1901 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
1902 struct compat_nfsctl_arg __user *arg)
1903 {
1904 if (!access_ok(VERIFY_READ, &arg->ca32_client,
1905 sizeof(arg->ca32_client)) ||
1906 get_user(karg->ca_version, &arg->ca32_version) ||
1907 __copy_from_user(&karg->ca_client.cl_ident[0],
1908 &arg->ca32_client.cl32_ident[0],
1909 NFSCLNT_IDMAX) ||
1910 __get_user(karg->ca_client.cl_naddr,
1911 &arg->ca32_client.cl32_naddr) ||
1912 __copy_from_user(&karg->ca_client.cl_addrlist[0],
1913 &arg->ca32_client.cl32_addrlist[0],
1914 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
1915 __get_user(karg->ca_client.cl_fhkeytype,
1916 &arg->ca32_client.cl32_fhkeytype) ||
1917 __get_user(karg->ca_client.cl_fhkeylen,
1918 &arg->ca32_client.cl32_fhkeylen) ||
1919 __copy_from_user(&karg->ca_client.cl_fhkey[0],
1920 &arg->ca32_client.cl32_fhkey[0],
1921 NFSCLNT_KEYMAX))
1922 return -EFAULT;
1923
1924 return 0;
1925 }
1926
1927 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
1928 struct compat_nfsctl_arg __user *arg)
1929 {
1930 if (!access_ok(VERIFY_READ, &arg->ca32_export,
1931 sizeof(arg->ca32_export)) ||
1932 get_user(karg->ca_version, &arg->ca32_version) ||
1933 __copy_from_user(&karg->ca_export.ex_client[0],
1934 &arg->ca32_export.ex32_client[0],
1935 NFSCLNT_IDMAX) ||
1936 __copy_from_user(&karg->ca_export.ex_path[0],
1937 &arg->ca32_export.ex32_path[0],
1938 NFS_MAXPATHLEN) ||
1939 __get_user(karg->ca_export.ex_dev,
1940 &arg->ca32_export.ex32_dev) ||
1941 __get_user(karg->ca_export.ex_ino,
1942 &arg->ca32_export.ex32_ino) ||
1943 __get_user(karg->ca_export.ex_flags,
1944 &arg->ca32_export.ex32_flags) ||
1945 __get_user(karg->ca_export.ex_anon_uid,
1946 &arg->ca32_export.ex32_anon_uid) ||
1947 __get_user(karg->ca_export.ex_anon_gid,
1948 &arg->ca32_export.ex32_anon_gid))
1949 return -EFAULT;
1950 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1951 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1952
1953 return 0;
1954 }
1955
1956 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
1957 struct compat_nfsctl_arg __user *arg)
1958 {
1959 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
1960 sizeof(arg->ca32_getfd)) ||
1961 get_user(karg->ca_version, &arg->ca32_version) ||
1962 __copy_from_user(&karg->ca_getfd.gd_addr,
1963 &arg->ca32_getfd.gd32_addr,
1964 (sizeof(struct sockaddr))) ||
1965 __copy_from_user(&karg->ca_getfd.gd_path,
1966 &arg->ca32_getfd.gd32_path,
1967 (NFS_MAXPATHLEN+1)) ||
1968 __get_user(karg->ca_getfd.gd_version,
1969 &arg->ca32_getfd.gd32_version))
1970 return -EFAULT;
1971
1972 return 0;
1973 }
1974
1975 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
1976 struct compat_nfsctl_arg __user *arg)
1977 {
1978 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
1979 get_user(karg->ca_version, &arg->ca32_version) ||
1980 __copy_from_user(&karg->ca_getfs.gd_addr,
1981 &arg->ca32_getfs.gd32_addr,
1982 (sizeof(struct sockaddr))) ||
1983 __copy_from_user(&karg->ca_getfs.gd_path,
1984 &arg->ca32_getfs.gd32_path,
1985 (NFS_MAXPATHLEN+1)) ||
1986 __get_user(karg->ca_getfs.gd_maxlen,
1987 &arg->ca32_getfs.gd32_maxlen))
1988 return -EFAULT;
1989
1990 return 0;
1991 }
1992
1993 /* This really doesn't need translations, we are only passing
1994 * back a union which contains opaque nfs file handle data.
1995 */
1996 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
1997 union compat_nfsctl_res __user *res)
1998 {
1999 int err;
2000
2001 err = copy_to_user(res, kres, sizeof(*res));
2002
2003 return (err) ? -EFAULT : 0;
2004 }
2005
2006 asmlinkage long compat_sys_nfsservctl(int cmd,
2007 struct compat_nfsctl_arg __user *arg,
2008 union compat_nfsctl_res __user *res)
2009 {
2010 struct nfsctl_arg *karg;
2011 union nfsctl_res *kres;
2012 mm_segment_t oldfs;
2013 int err;
2014
2015 karg = kmalloc(sizeof(*karg), GFP_USER);
2016 kres = kmalloc(sizeof(*kres), GFP_USER);
2017 if(!karg || !kres) {
2018 err = -ENOMEM;
2019 goto done;
2020 }
2021
2022 switch(cmd) {
2023 case NFSCTL_SVC:
2024 err = compat_nfs_svc_trans(karg, arg);
2025 break;
2026
2027 case NFSCTL_ADDCLIENT:
2028 err = compat_nfs_clnt_trans(karg, arg);
2029 break;
2030
2031 case NFSCTL_DELCLIENT:
2032 err = compat_nfs_clnt_trans(karg, arg);
2033 break;
2034
2035 case NFSCTL_EXPORT:
2036 case NFSCTL_UNEXPORT:
2037 err = compat_nfs_exp_trans(karg, arg);
2038 break;
2039
2040 case NFSCTL_GETFD:
2041 err = compat_nfs_getfd_trans(karg, arg);
2042 break;
2043
2044 case NFSCTL_GETFS:
2045 err = compat_nfs_getfs_trans(karg, arg);
2046 break;
2047
2048 default:
2049 err = -EINVAL;
2050 break;
2051 }
2052
2053 if (err)
2054 goto done;
2055
2056 oldfs = get_fs();
2057 set_fs(KERNEL_DS);
2058 /* The __user pointer casts are valid because of the set_fs() */
2059 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2060 set_fs(oldfs);
2061
2062 if (err)
2063 goto done;
2064
2065 if((cmd == NFSCTL_GETFD) ||
2066 (cmd == NFSCTL_GETFS))
2067 err = compat_nfs_getfh_res_trans(kres, res);
2068
2069 done:
2070 kfree(karg);
2071 kfree(kres);
2072 return err;
2073 }
2074 #else /* !NFSD */
2075 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2076 {
2077 return sys_ni_syscall();
2078 }
2079 #endif
2080
2081 #ifdef CONFIG_EPOLL
2082
2083 #ifdef TIF_RESTORE_SIGMASK
2084 asmlinkage long compat_sys_epoll_pwait(int epfd,
2085 struct compat_epoll_event __user *events,
2086 int maxevents, int timeout,
2087 const compat_sigset_t __user *sigmask,
2088 compat_size_t sigsetsize)
2089 {
2090 long err;
2091 compat_sigset_t csigmask;
2092 sigset_t ksigmask, sigsaved;
2093
2094 /*
2095 * If the caller wants a certain signal mask to be set during the wait,
2096 * we apply it here.
2097 */
2098 if (sigmask) {
2099 if (sigsetsize != sizeof(compat_sigset_t))
2100 return -EINVAL;
2101 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2102 return -EFAULT;
2103 sigset_from_compat(&ksigmask, &csigmask);
2104 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2105 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2106 }
2107
2108 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2109
2110 /*
2111 * If we changed the signal mask, we need to restore the original one.
2112 * In case we've got a signal while waiting, we do not restore the
2113 * signal mask yet, and we allow do_signal() to deliver the signal on
2114 * the way back to userspace, before the signal mask is restored.
2115 */
2116 if (sigmask) {
2117 if (err == -EINTR) {
2118 memcpy(&current->saved_sigmask, &sigsaved,
2119 sizeof(sigsaved));
2120 set_thread_flag(TIF_RESTORE_SIGMASK);
2121 } else
2122 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2123 }
2124
2125 return err;
2126 }
2127 #endif /* TIF_RESTORE_SIGMASK */
2128
2129 #endif /* CONFIG_EPOLL */
2130
2131 #ifdef CONFIG_SIGNALFD
2132
2133 asmlinkage long compat_sys_signalfd(int ufd,
2134 const compat_sigset_t __user *sigmask,
2135 compat_size_t sigsetsize)
2136 {
2137 compat_sigset_t ss32;
2138 sigset_t tmp;
2139 sigset_t __user *ksigmask;
2140
2141 if (sigsetsize != sizeof(compat_sigset_t))
2142 return -EINVAL;
2143 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2144 return -EFAULT;
2145 sigset_from_compat(&tmp, &ss32);
2146 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2147 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2148 return -EFAULT;
2149
2150 return sys_signalfd(ufd, ksigmask, sizeof(sigset_t));
2151 }
2152
2153 #endif /* CONFIG_SIGNALFD */
2154
2155 #ifdef CONFIG_TIMERFD
2156
2157 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2158 const struct compat_itimerspec __user *utmr,
2159 struct compat_itimerspec __user *otmr)
2160 {
2161 int error;
2162 struct itimerspec t;
2163 struct itimerspec __user *ut;
2164
2165 if (get_compat_itimerspec(&t, utmr))
2166 return -EFAULT;
2167 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2168 if (copy_to_user(&ut[0], &t, sizeof(t)))
2169 return -EFAULT;
2170 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2171 if (!error && otmr)
2172 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2173 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2174
2175 return error;
2176 }
2177
2178 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2179 struct compat_itimerspec __user *otmr)
2180 {
2181 int error;
2182 struct itimerspec t;
2183 struct itimerspec __user *ut;
2184
2185 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2186 error = sys_timerfd_gettime(ufd, ut);
2187 if (!error)
2188 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2189 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2190
2191 return error;
2192 }
2193
2194 #endif /* CONFIG_TIMERFD */
Stable & featurefull patchset based on Linus's git branch