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[PATCH] Fix some problems with truncate and mtime semantics.
[net-next-2.6.git] / fs / compat.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
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/linkage.h>
19#include <linux/compat.h>
20#include <linux/errno.h>
21#include <linux/time.h>
22#include <linux/fs.h>
23#include <linux/fcntl.h>
24#include <linux/namei.h>
25#include <linux/file.h>
26#include <linux/vfs.h>
27#include <linux/ioctl32.h>
28#include <linux/ioctl.h>
29#include <linux/init.h>
30#include <linux/sockios.h> /* for SIOCDEVPRIVATE */
31#include <linux/smb.h>
32#include <linux/smb_mount.h>
33#include <linux/ncp_mount.h>
9a9947bf 34#include <linux/nfs4_mount.h>
1da177e4
LT		 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>
0eeca283 40#include <linux/fsnotify.h>
1da177e4
LT		 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>
4a805e86
DM		 47#include <linux/acct.h>
48#include <linux/mm.h>
1da177e4
LT		 49
50#include <net/sock.h> /* siocdevprivate_ioctl */
51
52#include <asm/uaccess.h>
53#include <asm/mmu_context.h>
54#include <asm/ioctls.h>
55
56/*
57 * Not all architectures have sys_utime, so implement this in terms
58 * of sys_utimes.
59 */
60asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
61{
62 struct timeval tv[2];
63
64 if (t) {
65 if (get_user(tv[0].tv_sec, &t->actime) ||
66 get_user(tv[1].tv_sec, &t->modtime))
67 return -EFAULT;
68 tv[0].tv_usec = 0;
69 tv[1].tv_usec = 0;
70 }
71 return do_utimes(filename, t ? tv : NULL);
72}
73
74asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
75{
76 struct timeval tv[2];
77
78 if (t) {
79 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
80 get_user(tv[0].tv_usec, &t[0].tv_usec) ||
81 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
82 get_user(tv[1].tv_usec, &t[1].tv_usec))
83 return -EFAULT;
84 }
85 return do_utimes(filename, t ? tv : NULL);
86}
87
88asmlinkage long compat_sys_newstat(char __user * filename,
89 struct compat_stat __user *statbuf)
90{
91 struct kstat stat;
92 int error = vfs_stat(filename, &stat);
93
94 if (!error)
95 error = cp_compat_stat(&stat, statbuf);
96 return error;
97}
98
99asmlinkage long compat_sys_newlstat(char __user * filename,
100 struct compat_stat __user *statbuf)
101{
102 struct kstat stat;
103 int error = vfs_lstat(filename, &stat);
104
105 if (!error)
106 error = cp_compat_stat(&stat, statbuf);
107 return error;
108}
109
110asmlinkage long compat_sys_newfstat(unsigned int fd,
111 struct compat_stat __user * statbuf)
112{
113 struct kstat stat;
114 int error = vfs_fstat(fd, &stat);
115
116 if (!error)
117 error = cp_compat_stat(&stat, statbuf);
118 return error;
119}
120
121static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
122{
123
124 if (sizeof ubuf->f_blocks == 4) {
125 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
126 0xffffffff00000000ULL)
127 return -EOVERFLOW;
128 /* f_files and f_ffree may be -1; it's okay
129 * to stuff that into 32 bits */
130 if (kbuf->f_files != 0xffffffffffffffffULL
131 && (kbuf->f_files & 0xffffffff00000000ULL))
132 return -EOVERFLOW;
133 if (kbuf->f_ffree != 0xffffffffffffffffULL
134 && (kbuf->f_ffree & 0xffffffff00000000ULL))
135 return -EOVERFLOW;
136 }
137 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
138 __put_user(kbuf->f_type, &ubuf->f_type) ||
139 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
140 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
141 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
142 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
143 __put_user(kbuf->f_files, &ubuf->f_files) ||
144 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
145 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
146 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
147 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
148 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
149 __put_user(0, &ubuf->f_spare[0]) ||
150 __put_user(0, &ubuf->f_spare[1]) ||
151 __put_user(0, &ubuf->f_spare[2]) ||
152 __put_user(0, &ubuf->f_spare[3]) ||
153 __put_user(0, &ubuf->f_spare[4]))
154 return -EFAULT;
155 return 0;
156}
157
158/*
159 * The following statfs calls are copies of code from fs/open.c and
160 * should be checked against those from time to time
161 */
162asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
163{
164 struct nameidata nd;
165 int error;
166
167 error = user_path_walk(path, &nd);
168 if (!error) {
169 struct kstatfs tmp;
170 error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
86e07ce7
DG		 171 if (!error)
172 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 173 path_release(&nd);
174 }
175 return error;
176}
177
178asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
179{
180 struct file * file;
181 struct kstatfs tmp;
182 int error;
183
184 error = -EBADF;
185 file = fget(fd);
186 if (!file)
187 goto out;
188 error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
86e07ce7
DG		 189 if (!error)
190 error = put_compat_statfs(buf, &tmp);
1da177e4
LT		 191 fput(file);
192out:
193 return error;
194}
195
196static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
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 return -EFAULT;
224 return 0;
225}
226
227asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
228{
229 struct nameidata nd;
230 int error;
231
232 if (sz != sizeof(*buf))
233 return -EINVAL;
234
235 error = user_path_walk(path, &nd);
236 if (!error) {
237 struct kstatfs tmp;
238 error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
86e07ce7
DG		 239 if (!error)
240 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 241 path_release(&nd);
242 }
243 return error;
244}
245
246asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
247{
248 struct file * file;
249 struct kstatfs tmp;
250 int error;
251
252 if (sz != sizeof(*buf))
253 return -EINVAL;
254
255 error = -EBADF;
256 file = fget(fd);
257 if (!file)
258 goto out;
259 error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
86e07ce7
DG		 260 if (!error)
261 error = put_compat_statfs64(buf, &tmp);
1da177e4
LT		 262 fput(file);
263out:
264 return error;
265}
266
267/* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
268
269#define IOCTL_HASHSIZE 256
270static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
1da177e4
LT		 271
272extern struct ioctl_trans ioctl_start[];
273extern int ioctl_table_size;
274
275static inline unsigned long ioctl32_hash(unsigned long cmd)
276{
277 return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
278}
279
280static void ioctl32_insert_translation(struct ioctl_trans *trans)
281{
282 unsigned long hash;
283 struct ioctl_trans *t;
284
285 hash = ioctl32_hash (trans->cmd);
286 if (!ioctl32_hash_table[hash])
287 ioctl32_hash_table[hash] = trans;
288 else {
289 t = ioctl32_hash_table[hash];
290 while (t->next)
291 t = t->next;
292 trans->next = NULL;
293 t->next = trans;
294 }
295}
296
297static int __init init_sys32_ioctl(void)
298{
299 int i;
300
301 for (i = 0; i < ioctl_table_size; i++) {
302 if (ioctl_start[i].next != 0) {
303 printk("ioctl translation %d bad\n",i);
304 return -1;
305 }
306
307 ioctl32_insert_translation(&ioctl_start[i]);
308 }
309 return 0;
310}
311
312__initcall(init_sys32_ioctl);
313
1da177e4
LT		 314static void compat_ioctl_error(struct file *filp, unsigned int fd,
315 unsigned int cmd, unsigned long arg)
316{
317 char buf[10];
318 char *fn = "?";
319 char *path;
320
321 /* find the name of the device. */
322 path = (char *)__get_free_page(GFP_KERNEL);
323 if (path) {
324 fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE);
325 if (IS_ERR(fn))
326 fn = "?";
327 }
328
329 sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
330 if (!isprint(buf[1]))
331 sprintf(buf, "%02x", buf[1]);
332 printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
333 "cmd(%08x){%s} arg(%08x) on %s\n",
334 current->comm, current->pid,
335 (int)fd, (unsigned int)cmd, buf,
336 (unsigned int)arg, fn);
337
338 if (path)
339 free_page((unsigned long)path);
340}
341
342asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
343 unsigned long arg)
344{
345 struct file *filp;
346 int error = -EBADF;
347 struct ioctl_trans *t;
348 int fput_needed;
349
350 filp = fget_light(fd, &fput_needed);
351 if (!filp)
352 goto out;
353
354 /* RED-PEN how should LSM module know it's handling 32bit? */
355 error = security_file_ioctl(filp, cmd, arg);
356 if (error)
357 goto out_fput;
358
359 /*
360 * To allow the compat_ioctl handlers to be self contained
361 * we need to check the common ioctls here first.
362 * Just handle them with the standard handlers below.
363 */
364 switch (cmd) {
365 case FIOCLEX:
366 case FIONCLEX:
367 case FIONBIO:
368 case FIOASYNC:
369 case FIOQSIZE:
370 break;
371
372 case FIBMAP:
373 case FIGETBSZ:
374 case FIONREAD:
375 if (S_ISREG(filp->f_dentry->d_inode->i_mode))
376 break;
377 /*FALL THROUGH*/
378
379 default:
380 if (filp->f_op && filp->f_op->compat_ioctl) {
381 error = filp->f_op->compat_ioctl(filp, cmd, arg);
382 if (error != -ENOIOCTLCMD)
383 goto out_fput;
384 }
385
386 if (!filp->f_op ||
387 (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
388 goto do_ioctl;
389 break;
390 }
391
1da177e4
LT		 392 for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
393 if (t->cmd == cmd)
394 goto found_handler;
395 }
1da177e4
LT		 396
397 if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) &&
398 cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
399 error = siocdevprivate_ioctl(fd, cmd, arg);
400 } else {
401 static int count;
402
403 if (++count <= 50)
404 compat_ioctl_error(filp, fd, cmd, arg);
405 error = -EINVAL;
406 }
407
408 goto out_fput;
409
410 found_handler:
411 if (t->handler) {
412 lock_kernel();
413 error = t->handler(fd, cmd, arg, filp);
414 unlock_kernel();
1da177e4
LT		 415 goto out_fput;
416 }
417
1da177e4
LT		 418 do_ioctl:
419 error = vfs_ioctl(filp, fd, cmd, arg);
420 out_fput:
421 fput_light(filp, fput_needed);
422 out:
423 return error;
424}
425
426static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
427{
428 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
429 __get_user(kfl->l_type, &ufl->l_type) ||
430 __get_user(kfl->l_whence, &ufl->l_whence) ||
431 __get_user(kfl->l_start, &ufl->l_start) ||
432 __get_user(kfl->l_len, &ufl->l_len) ||
433 __get_user(kfl->l_pid, &ufl->l_pid))
434 return -EFAULT;
435 return 0;
436}
437
438static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
439{
440 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
441 __put_user(kfl->l_type, &ufl->l_type) ||
442 __put_user(kfl->l_whence, &ufl->l_whence) ||
443 __put_user(kfl->l_start, &ufl->l_start) ||
444 __put_user(kfl->l_len, &ufl->l_len) ||
445 __put_user(kfl->l_pid, &ufl->l_pid))
446 return -EFAULT;
447 return 0;
448}
449
450#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
451static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
452{
453 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
454 __get_user(kfl->l_type, &ufl->l_type) ||
455 __get_user(kfl->l_whence, &ufl->l_whence) ||
456 __get_user(kfl->l_start, &ufl->l_start) ||
457 __get_user(kfl->l_len, &ufl->l_len) ||
458 __get_user(kfl->l_pid, &ufl->l_pid))
459 return -EFAULT;
460 return 0;
461}
462#endif
463
464#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
465static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
466{
467 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
468 __put_user(kfl->l_type, &ufl->l_type) ||
469 __put_user(kfl->l_whence, &ufl->l_whence) ||
470 __put_user(kfl->l_start, &ufl->l_start) ||
471 __put_user(kfl->l_len, &ufl->l_len) ||
472 __put_user(kfl->l_pid, &ufl->l_pid))
473 return -EFAULT;
474 return 0;
475}
476#endif
477
478asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
479 unsigned long arg)
480{
481 mm_segment_t old_fs;
482 struct flock f;
483 long ret;
484
485 switch (cmd) {
486 case F_GETLK:
487 case F_SETLK:
488 case F_SETLKW:
489 ret = get_compat_flock(&f, compat_ptr(arg));
490 if (ret != 0)
491 break;
492 old_fs = get_fs();
493 set_fs(KERNEL_DS);
494 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
495 set_fs(old_fs);
496 if (cmd == F_GETLK && ret == 0) {
497 if ((f.l_start >= COMPAT_OFF_T_MAX) ||
498 ((f.l_start + f.l_len) > COMPAT_OFF_T_MAX))
499 ret = -EOVERFLOW;
500 if (ret == 0)
501 ret = put_compat_flock(&f, compat_ptr(arg));
502 }
503 break;
504
505 case F_GETLK64:
506 case F_SETLK64:
507 case F_SETLKW64:
508 ret = get_compat_flock64(&f, compat_ptr(arg));
509 if (ret != 0)
510 break;
511 old_fs = get_fs();
512 set_fs(KERNEL_DS);
513 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
514 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
515 (unsigned long)&f);
516 set_fs(old_fs);
517 if (cmd == F_GETLK64 && ret == 0) {
518 if ((f.l_start >= COMPAT_LOFF_T_MAX) ||
519 ((f.l_start + f.l_len) > COMPAT_LOFF_T_MAX))
520 ret = -EOVERFLOW;
521 if (ret == 0)
522 ret = put_compat_flock64(&f, compat_ptr(arg));
523 }
524 break;
525
526 default:
527 ret = sys_fcntl(fd, cmd, arg);
528 break;
529 }
530 return ret;
531}
532
533asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
534 unsigned long arg)
535{
536 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
537 return -EINVAL;
538 return compat_sys_fcntl64(fd, cmd, arg);
539}
540
541asmlinkage long
542compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
543{
544 long ret;
545 aio_context_t ctx64;
546
547 mm_segment_t oldfs = get_fs();
548 if (unlikely(get_user(ctx64, ctx32p)))
549 return -EFAULT;
550
551 set_fs(KERNEL_DS);
552 /* The __user pointer cast is valid because of the set_fs() */
553 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
554 set_fs(oldfs);
555 /* truncating is ok because it's a user address */
556 if (!ret)
557 ret = put_user((u32) ctx64, ctx32p);
558 return ret;
559}
560
561asmlinkage long
562compat_sys_io_getevents(aio_context_t ctx_id,
563 unsigned long min_nr,
564 unsigned long nr,
565 struct io_event __user *events,
566 struct compat_timespec __user *timeout)
567{
568 long ret;
569 struct timespec t;
570 struct timespec __user *ut = NULL;
571
572 ret = -EFAULT;
573 if (unlikely(!access_ok(VERIFY_WRITE, events,
574 nr * sizeof(struct io_event))))
575 goto out;
576 if (timeout) {
577 if (get_compat_timespec(&t, timeout))
578 goto out;
579
580 ut = compat_alloc_user_space(sizeof(*ut));
581 if (copy_to_user(ut, &t, sizeof(t)) )
582 goto out;
583 }
584 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
585out:
586 return ret;
587}
588
589static inline long
590copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
591{
592 compat_uptr_t uptr;
593 int i;
594
595 for (i = 0; i < nr; ++i) {
596 if (get_user(uptr, ptr32 + i))
597 return -EFAULT;
598 if (put_user(compat_ptr(uptr), ptr64 + i))
599 return -EFAULT;
600 }
601 return 0;
602}
603
604#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
605
606asmlinkage long
607compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
608{
609 struct iocb __user * __user *iocb64;
610 long ret;
611
612 if (unlikely(nr < 0))
613 return -EINVAL;
614
615 if (nr > MAX_AIO_SUBMITS)
616 nr = MAX_AIO_SUBMITS;
617
618 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
619 ret = copy_iocb(nr, iocb, iocb64);
620 if (!ret)
621 ret = sys_io_submit(ctx_id, nr, iocb64);
622 return ret;
623}
624
625struct compat_ncp_mount_data {
626 compat_int_t version;
627 compat_uint_t ncp_fd;
202e5979 628 __compat_uid_t mounted_uid;
1da177e4
LT		 629 compat_pid_t wdog_pid;
630 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
631 compat_uint_t time_out;
632 compat_uint_t retry_count;
633 compat_uint_t flags;
202e5979
SR		 634 __compat_uid_t uid;
635 __compat_gid_t gid;
1da177e4
LT		 636 compat_mode_t file_mode;
637 compat_mode_t dir_mode;
638};
639
640struct compat_ncp_mount_data_v4 {
641 compat_int_t version;
642 compat_ulong_t flags;
643 compat_ulong_t mounted_uid;
644 compat_long_t wdog_pid;
645 compat_uint_t ncp_fd;
646 compat_uint_t time_out;
647 compat_uint_t retry_count;
648 compat_ulong_t uid;
649 compat_ulong_t gid;
650 compat_ulong_t file_mode;
651 compat_ulong_t dir_mode;
652};
653
654static void *do_ncp_super_data_conv(void *raw_data)
655{
656 int version = *(unsigned int *)raw_data;
657
658 if (version == 3) {
659 struct compat_ncp_mount_data *c_n = raw_data;
660 struct ncp_mount_data *n = raw_data;
661
662 n->dir_mode = c_n->dir_mode;
663 n->file_mode = c_n->file_mode;
664 n->gid = c_n->gid;
665 n->uid = c_n->uid;
666 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
667 n->wdog_pid = c_n->wdog_pid;
668 n->mounted_uid = c_n->mounted_uid;
669 } else if (version == 4) {
670 struct compat_ncp_mount_data_v4 *c_n = raw_data;
671 struct ncp_mount_data_v4 *n = raw_data;
672
673 n->dir_mode = c_n->dir_mode;
674 n->file_mode = c_n->file_mode;
675 n->gid = c_n->gid;
676 n->uid = c_n->uid;
677 n->retry_count = c_n->retry_count;
678 n->time_out = c_n->time_out;
679 n->ncp_fd = c_n->ncp_fd;
680 n->wdog_pid = c_n->wdog_pid;
681 n->mounted_uid = c_n->mounted_uid;
682 n->flags = c_n->flags;
683 } else if (version != 5) {
684 return NULL;
685 }
686
687 return raw_data;
688}
689
690struct compat_smb_mount_data {
691 compat_int_t version;
202e5979
SR		 692 __compat_uid_t mounted_uid;
693 __compat_uid_t uid;
694 __compat_gid_t gid;
1da177e4
LT		 695 compat_mode_t file_mode;
696 compat_mode_t dir_mode;
697};
698
699static void *do_smb_super_data_conv(void *raw_data)
700{
701 struct smb_mount_data *s = raw_data;
702 struct compat_smb_mount_data *c_s = raw_data;
703
704 if (c_s->version != SMB_MOUNT_OLDVERSION)
705 goto out;
706 s->dir_mode = c_s->dir_mode;
707 s->file_mode = c_s->file_mode;
708 s->gid = c_s->gid;
709 s->uid = c_s->uid;
710 s->mounted_uid = c_s->mounted_uid;
711 out:
712 return raw_data;
713}
714
9a9947bf
DH		 715struct compat_nfs_string {
716 compat_uint_t len;
5fc3e624 717 compat_uptr_t data;
9a9947bf
DH		 718};
719
720static inline void compat_nfs_string(struct nfs_string *dst,
721 struct compat_nfs_string *src)
722{
723 dst->data = compat_ptr(src->data);
724 dst->len = src->len;
725}
726
727struct compat_nfs4_mount_data_v1 {
728 compat_int_t version;
729 compat_int_t flags;
730 compat_int_t rsize;
731 compat_int_t wsize;
732 compat_int_t timeo;
733 compat_int_t retrans;
734 compat_int_t acregmin;
735 compat_int_t acregmax;
736 compat_int_t acdirmin;
737 compat_int_t acdirmax;
738 struct compat_nfs_string client_addr;
739 struct compat_nfs_string mnt_path;
740 struct compat_nfs_string hostname;
741 compat_uint_t host_addrlen;
5fc3e624 742 compat_uptr_t host_addr;
9a9947bf
DH		 743 compat_int_t proto;
744 compat_int_t auth_flavourlen;
5fc3e624 745 compat_uptr_t auth_flavours;
9a9947bf
DH		 746};
747
748static int do_nfs4_super_data_conv(void *raw_data)
749{
750 int version = *(compat_uint_t *) raw_data;
751
752 if (version == 1) {
753 struct compat_nfs4_mount_data_v1 *raw = raw_data;
754 struct nfs4_mount_data *real = raw_data;
755
756 /* copy the fields backwards */
757 real->auth_flavours = compat_ptr(raw->auth_flavours);
758 real->auth_flavourlen = raw->auth_flavourlen;
759 real->proto = raw->proto;
760 real->host_addr = compat_ptr(raw->host_addr);
761 real->host_addrlen = raw->host_addrlen;
762 compat_nfs_string(&real->hostname, &raw->hostname);
763 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
764 compat_nfs_string(&real->client_addr, &raw->client_addr);
765 real->acdirmax = raw->acdirmax;
766 real->acdirmin = raw->acdirmin;
767 real->acregmax = raw->acregmax;
768 real->acregmin = raw->acregmin;
769 real->retrans = raw->retrans;
770 real->timeo = raw->timeo;
771 real->wsize = raw->wsize;
772 real->rsize = raw->rsize;
773 real->flags = raw->flags;
774 real->version = raw->version;
775 }
776 else {
777 return -EINVAL;
778 }
779
780 return 0;
781}
782
1da177e4
LT		 783extern int copy_mount_options (const void __user *, unsigned long *);
784
785#define SMBFS_NAME "smbfs"
786#define NCPFS_NAME "ncpfs"
9a9947bf 787#define NFS4_NAME "nfs4"
1da177e4
LT		 788
789asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
790 char __user * type, unsigned long flags,
791 void __user * data)
792{
793 unsigned long type_page;
794 unsigned long data_page;
795 unsigned long dev_page;
796 char *dir_page;
797 int retval;
798
799 retval = copy_mount_options (type, &type_page);
800 if (retval < 0)
801 goto out;
802
803 dir_page = getname(dir_name);
804 retval = PTR_ERR(dir_page);
805 if (IS_ERR(dir_page))
806 goto out1;
807
808 retval = copy_mount_options (dev_name, &dev_page);
809 if (retval < 0)
810 goto out2;
811
812 retval = copy_mount_options (data, &data_page);
813 if (retval < 0)
814 goto out3;
815
816 retval = -EINVAL;
817
818 if (type_page) {
819 if (!strcmp((char *)type_page, SMBFS_NAME)) {
820 do_smb_super_data_conv((void *)data_page);
821 } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
822 do_ncp_super_data_conv((void *)data_page);
9a9947bf
DH		 823 } else if (!strcmp((char *)type_page, NFS4_NAME)) {
824 if (do_nfs4_super_data_conv((void *) data_page))
825 goto out4;
1da177e4
LT		 826 }
827 }
828
829 lock_kernel();
830 retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
831 flags, (void*)data_page);
832 unlock_kernel();
833
9a9947bf 834 out4:
1da177e4
LT		 835 free_page(data_page);
836 out3:
837 free_page(dev_page);
838 out2:
839 putname(dir_page);
840 out1:
841 free_page(type_page);
842 out:
843 return retval;
844}
845
846#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
847#define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
848 ~(sizeof(compat_long_t)-1))
849
850struct compat_old_linux_dirent {
851 compat_ulong_t d_ino;
852 compat_ulong_t d_offset;
853 unsigned short d_namlen;
854 char d_name[1];
855};
856
857struct compat_readdir_callback {
858 struct compat_old_linux_dirent __user *dirent;
859 int result;
860};
861
862static int compat_fillonedir(void *__buf, const char *name, int namlen,
863 loff_t offset, ino_t ino, unsigned int d_type)
864{
865 struct compat_readdir_callback *buf = __buf;
866 struct compat_old_linux_dirent __user *dirent;
867
868 if (buf->result)
869 return -EINVAL;
870 buf->result++;
871 dirent = buf->dirent;
872 if (!access_ok(VERIFY_WRITE, dirent,
873 (unsigned long)(dirent->d_name + namlen + 1) -
874 (unsigned long)dirent))
875 goto efault;
876 if ( __put_user(ino, &dirent->d_ino) ||
877 __put_user(offset, &dirent->d_offset) ||
878 __put_user(namlen, &dirent->d_namlen) ||
879 __copy_to_user(dirent->d_name, name, namlen) ||
880 __put_user(0, dirent->d_name + namlen))
881 goto efault;
882 return 0;
883efault:
884 buf->result = -EFAULT;
885 return -EFAULT;
886}
887
888asmlinkage long compat_sys_old_readdir(unsigned int fd,
889 struct compat_old_linux_dirent __user *dirent, unsigned int count)
890{
891 int error;
892 struct file *file;
893 struct compat_readdir_callback buf;
894
895 error = -EBADF;
896 file = fget(fd);
897 if (!file)
898 goto out;
899
900 buf.result = 0;
901 buf.dirent = dirent;
902
903 error = vfs_readdir(file, compat_fillonedir, &buf);
904 if (error >= 0)
905 error = buf.result;
906
907 fput(file);
908out:
909 return error;
910}
911
912struct compat_linux_dirent {
913 compat_ulong_t d_ino;
914 compat_ulong_t d_off;
915 unsigned short d_reclen;
916 char d_name[1];
917};
918
919struct compat_getdents_callback {
920 struct compat_linux_dirent __user *current_dir;
921 struct compat_linux_dirent __user *previous;
922 int count;
923 int error;
924};
925
926static int compat_filldir(void *__buf, const char *name, int namlen,
927 loff_t offset, ino_t ino, unsigned int d_type)
928{
929 struct compat_linux_dirent __user * dirent;
930 struct compat_getdents_callback *buf = __buf;
931 int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
932
933 buf->error = -EINVAL; /* only used if we fail.. */
934 if (reclen > buf->count)
935 return -EINVAL;
936 dirent = buf->previous;
937 if (dirent) {
938 if (__put_user(offset, &dirent->d_off))
939 goto efault;
940 }
941 dirent = buf->current_dir;
942 if (__put_user(ino, &dirent->d_ino))
943 goto efault;
944 if (__put_user(reclen, &dirent->d_reclen))
945 goto efault;
946 if (copy_to_user(dirent->d_name, name, namlen))
947 goto efault;
948 if (__put_user(0, dirent->d_name + namlen))
949 goto efault;
950 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
951 goto efault;
952 buf->previous = dirent;
953 dirent = (void __user *)dirent + reclen;
954 buf->current_dir = dirent;
955 buf->count -= reclen;
956 return 0;
957efault:
958 buf->error = -EFAULT;
959 return -EFAULT;
960}
961
962asmlinkage long compat_sys_getdents(unsigned int fd,
963 struct compat_linux_dirent __user *dirent, unsigned int count)
964{
965 struct file * file;
966 struct compat_linux_dirent __user * lastdirent;
967 struct compat_getdents_callback buf;
968 int error;
969
970 error = -EFAULT;
971 if (!access_ok(VERIFY_WRITE, dirent, count))
972 goto out;
973
974 error = -EBADF;
975 file = fget(fd);
976 if (!file)
977 goto out;
978
979 buf.current_dir = dirent;
980 buf.previous = NULL;
981 buf.count = count;
982 buf.error = 0;
983
984 error = vfs_readdir(file, compat_filldir, &buf);
985 if (error < 0)
986 goto out_putf;
987 error = buf.error;
988 lastdirent = buf.previous;
989 if (lastdirent) {
990 if (put_user(file->f_pos, &lastdirent->d_off))
991 error = -EFAULT;
992 else
993 error = count - buf.count;
994 }
995
996out_putf:
997 fput(file);
998out:
999 return error;
1000}
1001
1002#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1003#define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
1004
1005struct compat_getdents_callback64 {
1006 struct linux_dirent64 __user *current_dir;
1007 struct linux_dirent64 __user *previous;
1008 int count;
1009 int error;
1010};
1011
1012static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1013 ino_t ino, unsigned int d_type)
1014{
1015 struct linux_dirent64 __user *dirent;
1016 struct compat_getdents_callback64 *buf = __buf;
1017 int jj = NAME_OFFSET(dirent);
1018 int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
1019 u64 off;
1020
1021 buf->error = -EINVAL; /* only used if we fail.. */
1022 if (reclen > buf->count)
1023 return -EINVAL;
1024 dirent = buf->previous;
1025
1026 if (dirent) {
1027 if (__put_user_unaligned(offset, &dirent->d_off))
1028 goto efault;
1029 }
1030 dirent = buf->current_dir;
1031 if (__put_user_unaligned(ino, &dirent->d_ino))
1032 goto efault;
1033 off = 0;
1034 if (__put_user_unaligned(off, &dirent->d_off))
1035 goto efault;
1036 if (__put_user(reclen, &dirent->d_reclen))
1037 goto efault;
1038 if (__put_user(d_type, &dirent->d_type))
1039 goto efault;
1040 if (copy_to_user(dirent->d_name, name, namlen))
1041 goto efault;
1042 if (__put_user(0, dirent->d_name + namlen))
1043 goto efault;
1044 buf->previous = dirent;
1045 dirent = (void __user *)dirent + reclen;
1046 buf->current_dir = dirent;
1047 buf->count -= reclen;
1048 return 0;
1049efault:
1050 buf->error = -EFAULT;
1051 return -EFAULT;
1052}
1053
1054asmlinkage long compat_sys_getdents64(unsigned int fd,
1055 struct linux_dirent64 __user * dirent, unsigned int count)
1056{
1057 struct file * file;
1058 struct linux_dirent64 __user * lastdirent;
1059 struct compat_getdents_callback64 buf;
1060 int error;
1061
1062 error = -EFAULT;
1063 if (!access_ok(VERIFY_WRITE, dirent, count))
1064 goto out;
1065
1066 error = -EBADF;
1067 file = fget(fd);
1068 if (!file)
1069 goto out;
1070
1071 buf.current_dir = dirent;
1072 buf.previous = NULL;
1073 buf.count = count;
1074 buf.error = 0;
1075
1076 error = vfs_readdir(file, compat_filldir64, &buf);
1077 if (error < 0)
1078 goto out_putf;
1079 error = buf.error;
1080 lastdirent = buf.previous;
1081 if (lastdirent) {
1082 typeof(lastdirent->d_off) d_off = file->f_pos;
1083 __put_user_unaligned(d_off, &lastdirent->d_off);
1084 error = count - buf.count;
1085 }
1086
1087out_putf:
1088 fput(file);
1089out:
1090 return error;
1091}
1092#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1093
1094static ssize_t compat_do_readv_writev(int type, struct file *file,
1095 const struct compat_iovec __user *uvector,
1096 unsigned long nr_segs, loff_t *pos)
1097{
1098 typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
1099 typedef ssize_t (*iov_fn_t)(struct file *, const struct iovec *, unsigned long, loff_t *);
1100
1101 compat_ssize_t tot_len;
1102 struct iovec iovstack[UIO_FASTIOV];
1103 struct iovec *iov=iovstack, *vector;
1104 ssize_t ret;
1105 int seg;
1106 io_fn_t fn;
1107 iov_fn_t fnv;
1108
1109 /*
1110 * SuS says "The readv() function *may* fail if the iovcnt argument
1111 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1112 * traditionally returned zero for zero segments, so...
1113 */
1114 ret = 0;
1115 if (nr_segs == 0)
1116 goto out;
1117
1118 /*
1119 * First get the "struct iovec" from user memory and
1120 * verify all the pointers
1121 */
1122 ret = -EINVAL;
1123 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1124 goto out;
1125 if (!file->f_op)
1126 goto out;
1127 if (nr_segs > UIO_FASTIOV) {
1128 ret = -ENOMEM;
1129 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1130 if (!iov)
1131 goto out;
1132 }
1133 ret = -EFAULT;
1134 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1135 goto out;
1136
1137 /*
1138 * Single unix specification:
1139 * We should -EINVAL if an element length is not >= 0 and fitting an
1140 * ssize_t. The total length is fitting an ssize_t
1141 *
1142 * Be careful here because iov_len is a size_t not an ssize_t
1143 */
1144 tot_len = 0;
1145 vector = iov;
1146 ret = -EINVAL;
1147 for (seg = 0 ; seg < nr_segs; seg++) {
1148 compat_ssize_t tmp = tot_len;
1149 compat_ssize_t len;
1150 compat_uptr_t buf;
1151
1152 if (__get_user(len, &uvector->iov_len) ||
1153 __get_user(buf, &uvector->iov_base)) {
1154 ret = -EFAULT;
1155 goto out;
1156 }
1157 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1158 goto out;
1159 tot_len += len;
1160 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1161 goto out;
1162 vector->iov_base = compat_ptr(buf);
1163 vector->iov_len = (compat_size_t) len;
1164 uvector++;
1165 vector++;
1166 }
1167 if (tot_len == 0) {
1168 ret = 0;
1169 goto out;
1170 }
1171
1172 ret = rw_verify_area(type, file, pos, tot_len);
e28cc715 1173 if (ret < 0)
1da177e4
LT		 1174 goto out;
1175
1176 fnv = NULL;
1177 if (type == READ) {
1178 fn = file->f_op->read;
1179 fnv = file->f_op->readv;
1180 } else {
1181 fn = (io_fn_t)file->f_op->write;
1182 fnv = file->f_op->writev;
1183 }
1184 if (fnv) {
1185 ret = fnv(file, iov, nr_segs, pos);
1186 goto out;
1187 }
1188
1189 /* Do it by hand, with file-ops */
1190 ret = 0;
1191 vector = iov;
1192 while (nr_segs > 0) {
1193 void __user * base;
1194 size_t len;
1195 ssize_t nr;
1196
1197 base = vector->iov_base;
1198 len = vector->iov_len;
1199 vector++;
1200 nr_segs--;
1201
1202 nr = fn(file, base, len, pos);
1203
1204 if (nr < 0) {
1205 if (!ret) ret = nr;
1206 break;
1207 }
1208 ret += nr;
1209 if (nr != len)
1210 break;
1211 }
1212out:
1213 if (iov != iovstack)
1214 kfree(iov);
0eeca283
RL		 1215 if ((ret + (type == READ)) > 0) {
1216 struct dentry *dentry = file->f_dentry;
1217 if (type == READ)
1218 fsnotify_access(dentry);
1219 else
1220 fsnotify_modify(dentry);
1221 }
1da177e4
LT		 1222 return ret;
1223}
1224
1225asmlinkage ssize_t
1226compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1227{
1228 struct file *file;
1229 ssize_t ret = -EBADF;
1230
1231 file = fget(fd);
1232 if (!file)
1233 return -EBADF;
1234
1235 if (!(file->f_mode & FMODE_READ))
1236 goto out;
1237
1238 ret = -EINVAL;
1239 if (!file->f_op || (!file->f_op->readv && !file->f_op->read))
1240 goto out;
1241
1242 ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
1243
1244out:
1245 fput(file);
1246 return ret;
1247}
1248
1249asmlinkage ssize_t
1250compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
1251{
1252 struct file *file;
1253 ssize_t ret = -EBADF;
1254
1255 file = fget(fd);
1256 if (!file)
1257 return -EBADF;
1258 if (!(file->f_mode & FMODE_WRITE))
1259 goto out;
1260
1261 ret = -EINVAL;
1262 if (!file->f_op || (!file->f_op->writev && !file->f_op->write))
1263 goto out;
1264
1265 ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
1266
1267out:
1268 fput(file);
1269 return ret;
1270}
1271
e922efc3
MS		 1272/*
1273 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1274 * O_LARGEFILE flag.
1275 */
1276asmlinkage long
1277compat_sys_open(const char __user *filename, int flags, int mode)
1278{
1279 return do_sys_open(filename, flags, mode);
1280}
1281
1da177e4
LT		 1282/*
1283 * compat_count() counts the number of arguments/envelopes. It is basically
1284 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1285 * and envp pointers.
1286 */
1287static int compat_count(compat_uptr_t __user *argv, int max)
1288{
1289 int i = 0;
1290
1291 if (argv != NULL) {
1292 for (;;) {
1293 compat_uptr_t p;
1294
1295 if (get_user(p, argv))
1296 return -EFAULT;
1297 if (!p)
1298 break;
1299 argv++;
1300 if(++i > max)
1301 return -E2BIG;
1302 }
1303 }
1304 return i;
1305}
1306
1307/*
1308 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1309 * except that it works with 32 bit argv and envp pointers.
1310 */
1311static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1312 struct linux_binprm *bprm)
1313{
1314 struct page *kmapped_page = NULL;
1315 char *kaddr = NULL;
1316 int ret;
1317
1318 while (argc-- > 0) {
1319 compat_uptr_t str;
1320 int len;
1321 unsigned long pos;
1322
1323 if (get_user(str, argv+argc) ||
1324 !(len = strnlen_user(compat_ptr(str), bprm->p))) {
1325 ret = -EFAULT;
1326 goto out;
1327 }
1328
1329 if (bprm->p < len) {
1330 ret = -E2BIG;
1331 goto out;
1332 }
1333
1334 bprm->p -= len;
1335 /* XXX: add architecture specific overflow check here. */
1336 pos = bprm->p;
1337
1338 while (len > 0) {
1339 int i, new, err;
1340 int offset, bytes_to_copy;
1341 struct page *page;
1342
1343 offset = pos % PAGE_SIZE;
1344 i = pos/PAGE_SIZE;
1345 page = bprm->page[i];
1346 new = 0;
1347 if (!page) {
1348 page = alloc_page(GFP_HIGHUSER);
1349 bprm->page[i] = page;
1350 if (!page) {
1351 ret = -ENOMEM;
1352 goto out;
1353 }
1354 new = 1;
1355 }
1356
1357 if (page != kmapped_page) {
1358 if (kmapped_page)
1359 kunmap(kmapped_page);
1360 kmapped_page = page;
1361 kaddr = kmap(kmapped_page);
1362 }
1363 if (new && offset)
1364 memset(kaddr, 0, offset);
1365 bytes_to_copy = PAGE_SIZE - offset;
1366 if (bytes_to_copy > len) {
1367 bytes_to_copy = len;
1368 if (new)
1369 memset(kaddr+offset+len, 0,
1370 PAGE_SIZE-offset-len);
1371 }
1372 err = copy_from_user(kaddr+offset, compat_ptr(str),
1373 bytes_to_copy);
1374 if (err) {
1375 ret = -EFAULT;
1376 goto out;
1377 }
1378
1379 pos += bytes_to_copy;
1380 str += bytes_to_copy;
1381 len -= bytes_to_copy;
1382 }
1383 }
1384 ret = 0;
1385out:
1386 if (kmapped_page)
1387 kunmap(kmapped_page);
1388 return ret;
1389}
1390
1391#ifdef CONFIG_MMU
1392
1393#define free_arg_pages(bprm) do { } while (0)
1394
1395#else
1396
1397static inline void free_arg_pages(struct linux_binprm *bprm)
1398{
1399 int i;
1400
1401 for (i = 0; i < MAX_ARG_PAGES; i++) {
1402 if (bprm->page[i])
1403 __free_page(bprm->page[i]);
1404 bprm->page[i] = NULL;
1405 }
1406}
1407
1408#endif /* CONFIG_MMU */
1409
1410/*
1411 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1412 * that it processes 32 bit argv and envp pointers.
1413 */
1414int compat_do_execve(char * filename,
1415 compat_uptr_t __user *argv,
1416 compat_uptr_t __user *envp,
1417 struct pt_regs * regs)
1418{
1419 struct linux_binprm *bprm;
1420 struct file *file;
1421 int retval;
1422 int i;
1423
1424 retval = -ENOMEM;
1425 bprm = kmalloc(sizeof(*bprm), GFP_KERNEL);
1426 if (!bprm)
1427 goto out_ret;
1428 memset(bprm, 0, sizeof(*bprm));
1429
1430 file = open_exec(filename);
1431 retval = PTR_ERR(file);
1432 if (IS_ERR(file))
1433 goto out_kfree;
1434
1435 sched_exec();
1436
1437 bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1438 bprm->file = file;
1439 bprm->filename = filename;
1440 bprm->interp = filename;
1441 bprm->mm = mm_alloc();
1442 retval = -ENOMEM;
1443 if (!bprm->mm)
1444 goto out_file;
1445
1446 retval = init_new_context(current, bprm->mm);
1447 if (retval < 0)
1448 goto out_mm;
1449
1450 bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
1451 if ((retval = bprm->argc) < 0)
1452 goto out_mm;
1453
1454 bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
1455 if ((retval = bprm->envc) < 0)
1456 goto out_mm;
1457
1458 retval = security_bprm_alloc(bprm);
1459 if (retval)
1460 goto out;
1461
1462 retval = prepare_binprm(bprm);
1463 if (retval < 0)
1464 goto out;
1465
1466 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1467 if (retval < 0)
1468 goto out;
1469
1470 bprm->exec = bprm->p;
1471 retval = compat_copy_strings(bprm->envc, envp, bprm);
1472 if (retval < 0)
1473 goto out;
1474
1475 retval = compat_copy_strings(bprm->argc, argv, bprm);
1476 if (retval < 0)
1477 goto out;
1478
1479 retval = search_binary_handler(bprm, regs);
1480 if (retval >= 0) {
1481 free_arg_pages(bprm);
1482
1483 /* execve success */
1484 security_bprm_free(bprm);
4a805e86 1485 acct_update_integrals(current);
1da177e4
LT		 1486 kfree(bprm);
1487 return retval;
1488 }
1489
1490out:
1491 /* Something went wrong, return the inode and free the argument pages*/
1492 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1493 struct page * page = bprm->page[i];
1494 if (page)
1495 __free_page(page);
1496 }
1497
1498 if (bprm->security)
1499 security_bprm_free(bprm);
1500
1501out_mm:
1502 if (bprm->mm)
1503 mmdrop(bprm->mm);
1504
1505out_file:
1506 if (bprm->file) {
1507 allow_write_access(bprm->file);
1508 fput(bprm->file);
1509 }
1510
1511out_kfree:
1512 kfree(bprm);
1513
1514out_ret:
1515 return retval;
1516}
1517
1518#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1519
1520#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
1521
1522/*
1523 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1524 * 64-bit unsigned longs.
1525 */
1526static inline
1527int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1528 unsigned long *fdset)
1529{
1530 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1531 if (ufdset) {
1532 unsigned long odd;
1533
1534 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1535 return -EFAULT;
1536
1537 odd = nr & 1UL;
1538 nr &= ~1UL;
1539 while (nr) {
1540 unsigned long h, l;
1541 __get_user(l, ufdset);
1542 __get_user(h, ufdset+1);
1543 ufdset += 2;
1544 *fdset++ = h << 32 | l;
1545 nr -= 2;
1546 }
1547 if (odd)
1548 __get_user(*fdset, ufdset);
1549 } else {
1550 /* Tricky, must clear full unsigned long in the
1551 * kernel fdset at the end, this makes sure that
1552 * actually happens.
1553 */
1554 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1555 }
1556 return 0;
1557}
1558
1559static inline
1560void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1561 unsigned long *fdset)
1562{
1563 unsigned long odd;
1564 nr = ROUND_UP(nr, __COMPAT_NFDBITS);
1565
1566 if (!ufdset)
1567 return;
1568
1569 odd = nr & 1UL;
1570 nr &= ~1UL;
1571 while (nr) {
1572 unsigned long h, l;
1573 l = *fdset++;
1574 h = l >> 32;
1575 __put_user(l, ufdset);
1576 __put_user(h, ufdset+1);
1577 ufdset += 2;
1578 nr -= 2;
1579 }
1580 if (odd)
1581 __put_user(*fdset, ufdset);
1582}
1583
1584
1585/*
1586 * This is a virtual copy of sys_select from fs/select.c and probably
1587 * should be compared to it from time to time
1588 */
1589static void *select_bits_alloc(int size)
1590{
1591 return kmalloc(6 * size, GFP_KERNEL);
1592}
1593
1594static void select_bits_free(void *bits, int size)
1595{
1596 kfree(bits);
1597}
1598
1599/*
1600 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1601 * like to be certain this leads to no problems. So I return
1602 * EINTR just for safety.
1603 *
1604 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1605 * I'm trying ERESTARTNOHAND which restart only when you want to.
1606 */
1607#define MAX_SELECT_SECONDS \
1608 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1609
1610asmlinkage long
1611compat_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp,
1612 compat_ulong_t __user *exp, struct compat_timeval __user *tvp)
1613{
1614 fd_set_bits fds;
1615 char *bits;
1616 long timeout;
1617 int size, max_fdset, ret = -EINVAL;
a4531edd 1618 struct fdtable *fdt;
1da177e4
LT		 1619
1620 timeout = MAX_SCHEDULE_TIMEOUT;
1621 if (tvp) {
1622 time_t sec, usec;
1623
1624 if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
1625 || __get_user(sec, &tvp->tv_sec)
1626 || __get_user(usec, &tvp->tv_usec)) {
1627 ret = -EFAULT;
1628 goto out_nofds;
1629 }
1630
1631 if (sec < 0 || usec < 0)
1632 goto out_nofds;
1633
1634 if ((unsigned long) sec < MAX_SELECT_SECONDS) {
1635 timeout = ROUND_UP(usec, 1000000/HZ);
1636 timeout += sec * (unsigned long) HZ;
1637 }
1638 }
1639
1640 if (n < 0)
1641 goto out_nofds;
1642
1643 /* max_fdset can increase, so grab it once to avoid race */
ac5b8b6f 1644 rcu_read_lock();
a4531edd
LT		 1645 fdt = files_fdtable(current->files);
1646 max_fdset = fdt->max_fdset;
ac5b8b6f 1647 rcu_read_unlock();
1da177e4
LT		 1648 if (n > max_fdset)
1649 n = max_fdset;
1650
1651 /*
1652 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1653 * since we used fdset we need to allocate memory in units of
1654 * long-words.
1655 */
1656 ret = -ENOMEM;
1657 size = FDS_BYTES(n);
1658 bits = select_bits_alloc(size);
1659 if (!bits)
1660 goto out_nofds;
1661 fds.in = (unsigned long *) bits;
1662 fds.out = (unsigned long *) (bits + size);
1663 fds.ex = (unsigned long *) (bits + 2*size);
1664 fds.res_in = (unsigned long *) (bits + 3*size);
1665 fds.res_out = (unsigned long *) (bits + 4*size);
1666 fds.res_ex = (unsigned long *) (bits + 5*size);
1667
1668 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1669 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1670 (ret = compat_get_fd_set(n, exp, fds.ex)))
1671 goto out;
1672 zero_fd_set(n, fds.res_in);
1673 zero_fd_set(n, fds.res_out);
1674 zero_fd_set(n, fds.res_ex);
1675
1676 ret = do_select(n, &fds, &timeout);
1677
1678 if (tvp && !(current->personality & STICKY_TIMEOUTS)) {
1679 time_t sec = 0, usec = 0;
1680 if (timeout) {
1681 sec = timeout / HZ;
1682 usec = timeout % HZ;
1683 usec *= (1000000/HZ);
1684 }
1685 if (put_user(sec, &tvp->tv_sec) ||
1686 put_user(usec, &tvp->tv_usec))
1687 ret = -EFAULT;
1688 }
1689
1690 if (ret < 0)
1691 goto out;
1692 if (!ret) {
1693 ret = -ERESTARTNOHAND;
1694 if (signal_pending(current))
1695 goto out;
1696 ret = 0;
1697 }
1698
1699 compat_set_fd_set(n, inp, fds.res_in);
1700 compat_set_fd_set(n, outp, fds.res_out);
1701 compat_set_fd_set(n, exp, fds.res_ex);
1702
1703out:
1704 select_bits_free(bits, size);
1705out_nofds:
1706 return ret;
1707}
1708
1709#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1710/* Stuff for NFS server syscalls... */
1711struct compat_nfsctl_svc {
1712 u16 svc32_port;
1713 s32 svc32_nthreads;
1714};
1715
1716struct compat_nfsctl_client {
1717 s8 cl32_ident[NFSCLNT_IDMAX+1];
1718 s32 cl32_naddr;
1719 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1720 s32 cl32_fhkeytype;
1721 s32 cl32_fhkeylen;
1722 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1723};
1724
1725struct compat_nfsctl_export {
1726 char ex32_client[NFSCLNT_IDMAX+1];
1727 char ex32_path[NFS_MAXPATHLEN+1];
1728 compat_dev_t ex32_dev;
1729 compat_ino_t ex32_ino;
1730 compat_int_t ex32_flags;
202e5979
SR		 1731 __compat_uid_t ex32_anon_uid;
1732 __compat_gid_t ex32_anon_gid;
1da177e4
LT		 1733};
1734
1735struct compat_nfsctl_fdparm {
1736 struct sockaddr gd32_addr;
1737 s8 gd32_path[NFS_MAXPATHLEN+1];
1738 compat_int_t gd32_version;
1739};
1740
1741struct compat_nfsctl_fsparm {
1742 struct sockaddr gd32_addr;
1743 s8 gd32_path[NFS_MAXPATHLEN+1];
1744 compat_int_t gd32_maxlen;
1745};
1746
1747struct compat_nfsctl_arg {
1748 compat_int_t ca32_version; /* safeguard */
1749 union {
1750 struct compat_nfsctl_svc u32_svc;
1751 struct compat_nfsctl_client u32_client;
1752 struct compat_nfsctl_export u32_export;
1753 struct compat_nfsctl_fdparm u32_getfd;
1754 struct compat_nfsctl_fsparm u32_getfs;
1755 } u;
1756#define ca32_svc u.u32_svc
1757#define ca32_client u.u32_client
1758#define ca32_export u.u32_export
1759#define ca32_getfd u.u32_getfd
1760#define ca32_getfs u.u32_getfs
1761};
1762
1763union compat_nfsctl_res {
1764 __u8 cr32_getfh[NFS_FHSIZE];
1765 struct knfsd_fh cr32_getfs;
1766};
1767
1768static int compat_nfs_svc_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
1769{
1770 int err;
1771
1772 err = access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc));
1773 err |= get_user(karg->ca_version, &arg->ca32_version);
1774 err |= __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port);
1775 err |= __get_user(karg->ca_svc.svc_nthreads, &arg->ca32_svc.svc32_nthreads);
1776 return (err) ? -EFAULT : 0;
1777}
1778
1779static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
1780{
1781 int err;
1782
1783 err = access_ok(VERIFY_READ, &arg->ca32_client, sizeof(arg->ca32_client));
1784 err |= get_user(karg->ca_version, &arg->ca32_version);
1785 err |= __copy_from_user(&karg->ca_client.cl_ident[0],
1786 &arg->ca32_client.cl32_ident[0],
1787 NFSCLNT_IDMAX);
1788 err |= __get_user(karg->ca_client.cl_naddr, &arg->ca32_client.cl32_naddr);
1789 err |= __copy_from_user(&karg->ca_client.cl_addrlist[0],
1790 &arg->ca32_client.cl32_addrlist[0],
1791 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX));
1792 err |= __get_user(karg->ca_client.cl_fhkeytype,
1793 &arg->ca32_client.cl32_fhkeytype);
1794 err |= __get_user(karg->ca_client.cl_fhkeylen,
1795 &arg->ca32_client.cl32_fhkeylen);
1796 err |= __copy_from_user(&karg->ca_client.cl_fhkey[0],
1797 &arg->ca32_client.cl32_fhkey[0],
1798 NFSCLNT_KEYMAX);
1799
1800 return (err) ? -EFAULT : 0;
1801}
1802
1803static int compat_nfs_exp_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
1804{
1805 int err;
1806
1807 err = access_ok(VERIFY_READ, &arg->ca32_export, sizeof(arg->ca32_export));
1808 err |= get_user(karg->ca_version, &arg->ca32_version);
1809 err |= __copy_from_user(&karg->ca_export.ex_client[0],
1810 &arg->ca32_export.ex32_client[0],
1811 NFSCLNT_IDMAX);
1812 err |= __copy_from_user(&karg->ca_export.ex_path[0],
1813 &arg->ca32_export.ex32_path[0],
1814 NFS_MAXPATHLEN);
1815 err |= __get_user(karg->ca_export.ex_dev,
1816 &arg->ca32_export.ex32_dev);
1817 err |= __get_user(karg->ca_export.ex_ino,
1818 &arg->ca32_export.ex32_ino);
1819 err |= __get_user(karg->ca_export.ex_flags,
1820 &arg->ca32_export.ex32_flags);
1821 err |= __get_user(karg->ca_export.ex_anon_uid,
1822 &arg->ca32_export.ex32_anon_uid);
1823 err |= __get_user(karg->ca_export.ex_anon_gid,
1824 &arg->ca32_export.ex32_anon_gid);
1825 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
1826 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
1827
1828 return (err) ? -EFAULT : 0;
1829}
1830
1831static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
1832{
1833 int err;
1834
1835 err = access_ok(VERIFY_READ, &arg->ca32_getfd, sizeof(arg->ca32_getfd));
1836 err |= get_user(karg->ca_version, &arg->ca32_version);
1837 err |= __copy_from_user(&karg->ca_getfd.gd_addr,
1838 &arg->ca32_getfd.gd32_addr,
1839 (sizeof(struct sockaddr)));
1840 err |= __copy_from_user(&karg->ca_getfd.gd_path,
1841 &arg->ca32_getfd.gd32_path,
1842 (NFS_MAXPATHLEN+1));
1843 err |= __get_user(karg->ca_getfd.gd_version,
1844 &arg->ca32_getfd.gd32_version);
1845
1846 return (err) ? -EFAULT : 0;
1847}
1848
1849static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg)
1850{
1851 int err;
1852
1853 err = access_ok(VERIFY_READ, &arg->ca32_getfs, sizeof(arg->ca32_getfs));
1854 err |= get_user(karg->ca_version, &arg->ca32_version);
1855 err |= __copy_from_user(&karg->ca_getfs.gd_addr,
1856 &arg->ca32_getfs.gd32_addr,
1857 (sizeof(struct sockaddr)));
1858 err |= __copy_from_user(&karg->ca_getfs.gd_path,
1859 &arg->ca32_getfs.gd32_path,
1860 (NFS_MAXPATHLEN+1));
1861 err |= __get_user(karg->ca_getfs.gd_maxlen,
1862 &arg->ca32_getfs.gd32_maxlen);
1863
1864 return (err) ? -EFAULT : 0;
1865}
1866
1867/* This really doesn't need translations, we are only passing
1868 * back a union which contains opaque nfs file handle data.
1869 */
1870static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, union compat_nfsctl_res __user *res)
1871{
1872 int err;
1873
1874 err = copy_to_user(res, kres, sizeof(*res));
1875
1876 return (err) ? -EFAULT : 0;
1877}
1878
1879asmlinkage long compat_sys_nfsservctl(int cmd, struct compat_nfsctl_arg __user *arg,
1880 union compat_nfsctl_res __user *res)
1881{
1882 struct nfsctl_arg *karg;
1883 union nfsctl_res *kres;
1884 mm_segment_t oldfs;
1885 int err;
1886
1887 karg = kmalloc(sizeof(*karg), GFP_USER);
1888 kres = kmalloc(sizeof(*kres), GFP_USER);
1889 if(!karg || !kres) {
1890 err = -ENOMEM;
1891 goto done;
1892 }
1893
1894 switch(cmd) {
1895 case NFSCTL_SVC:
1896 err = compat_nfs_svc_trans(karg, arg);
1897 break;
1898
1899 case NFSCTL_ADDCLIENT:
1900 err = compat_nfs_clnt_trans(karg, arg);
1901 break;
1902
1903 case NFSCTL_DELCLIENT:
1904 err = compat_nfs_clnt_trans(karg, arg);
1905 break;
1906
1907 case NFSCTL_EXPORT:
1908 case NFSCTL_UNEXPORT:
1909 err = compat_nfs_exp_trans(karg, arg);
1910 break;
1911
1912 case NFSCTL_GETFD:
1913 err = compat_nfs_getfd_trans(karg, arg);
1914 break;
1915
1916 case NFSCTL_GETFS:
1917 err = compat_nfs_getfs_trans(karg, arg);
1918 break;
1919
1920 default:
1921 err = -EINVAL;
1922 goto done;
1923 }
1924
1925 oldfs = get_fs();
1926 set_fs(KERNEL_DS);
1927 /* The __user pointer casts are valid because of the set_fs() */
1928 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
1929 set_fs(oldfs);
1930
1931 if (err)
1932 goto done;
1933
1934 if((cmd == NFSCTL_GETFD) ||
1935 (cmd == NFSCTL_GETFS))
1936 err = compat_nfs_getfh_res_trans(kres, res);
1937
1938done:
1939 kfree(karg);
1940 kfree(kres);
1941 return err;
1942}
1943#else /* !NFSD */
1944long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
1945{
1946 return sys_ni_syscall();
1947}
1948#endif
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