Root/
1 | /* |
2 | * linux/fs/compat.c |
3 | * |
4 | * Kernel compatibililty routines for e.g. 32 bit syscall support |
5 | * on 64 bit kernels. |
6 | * |
7 | * Copyright (C) 2002 Stephen Rothwell, IBM Corporation |
8 | * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com) |
9 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) |
10 | * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs |
11 | * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify |
14 | * it under the terms of the GNU General Public License version 2 as |
15 | * published by the Free Software Foundation. |
16 | */ |
17 | |
18 | #include <linux/stddef.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/linkage.h> |
21 | #include <linux/compat.h> |
22 | #include <linux/errno.h> |
23 | #include <linux/time.h> |
24 | #include <linux/fs.h> |
25 | #include <linux/fcntl.h> |
26 | #include <linux/namei.h> |
27 | #include <linux/file.h> |
28 | #include <linux/fdtable.h> |
29 | #include <linux/vfs.h> |
30 | #include <linux/ioctl.h> |
31 | #include <linux/init.h> |
32 | #include <linux/smb.h> |
33 | #include <linux/smb_mount.h> |
34 | #include <linux/ncp_mount.h> |
35 | #include <linux/nfs4_mount.h> |
36 | #include <linux/syscalls.h> |
37 | #include <linux/ctype.h> |
38 | #include <linux/module.h> |
39 | #include <linux/dirent.h> |
40 | #include <linux/fsnotify.h> |
41 | #include <linux/highuid.h> |
42 | #include <linux/nfsd/syscall.h> |
43 | #include <linux/personality.h> |
44 | #include <linux/rwsem.h> |
45 | #include <linux/tsacct_kern.h> |
46 | #include <linux/security.h> |
47 | #include <linux/highmem.h> |
48 | #include <linux/signal.h> |
49 | #include <linux/poll.h> |
50 | #include <linux/mm.h> |
51 | #include <linux/eventpoll.h> |
52 | #include <linux/fs_struct.h> |
53 | #include <linux/slab.h> |
54 | |
55 | #include <asm/uaccess.h> |
56 | #include <asm/mmu_context.h> |
57 | #include <asm/ioctls.h> |
58 | #include "internal.h" |
59 | |
60 | int compat_log = 1; |
61 | |
62 | int compat_printk(const char *fmt, ...) |
63 | { |
64 | va_list ap; |
65 | int ret; |
66 | if (!compat_log) |
67 | return 0; |
68 | va_start(ap, fmt); |
69 | ret = vprintk(fmt, ap); |
70 | va_end(ap); |
71 | return ret; |
72 | } |
73 | |
74 | #include "read_write.h" |
75 | |
76 | /* |
77 | * Not all architectures have sys_utime, so implement this in terms |
78 | * of sys_utimes. |
79 | */ |
80 | asmlinkage long compat_sys_utime(const char __user *filename, |
81 | struct compat_utimbuf __user *t) |
82 | { |
83 | struct timespec tv[2]; |
84 | |
85 | if (t) { |
86 | if (get_user(tv[0].tv_sec, &t->actime) || |
87 | get_user(tv[1].tv_sec, &t->modtime)) |
88 | return -EFAULT; |
89 | tv[0].tv_nsec = 0; |
90 | tv[1].tv_nsec = 0; |
91 | } |
92 | return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); |
93 | } |
94 | |
95 | asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags) |
96 | { |
97 | struct timespec tv[2]; |
98 | |
99 | if (t) { |
100 | if (get_compat_timespec(&tv[0], &t[0]) || |
101 | get_compat_timespec(&tv[1], &t[1])) |
102 | return -EFAULT; |
103 | |
104 | if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) |
105 | return 0; |
106 | } |
107 | return do_utimes(dfd, filename, t ? tv : NULL, flags); |
108 | } |
109 | |
110 | asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t) |
111 | { |
112 | struct timespec tv[2]; |
113 | |
114 | if (t) { |
115 | if (get_user(tv[0].tv_sec, &t[0].tv_sec) || |
116 | get_user(tv[0].tv_nsec, &t[0].tv_usec) || |
117 | get_user(tv[1].tv_sec, &t[1].tv_sec) || |
118 | get_user(tv[1].tv_nsec, &t[1].tv_usec)) |
119 | return -EFAULT; |
120 | if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || |
121 | tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) |
122 | return -EINVAL; |
123 | tv[0].tv_nsec *= 1000; |
124 | tv[1].tv_nsec *= 1000; |
125 | } |
126 | return do_utimes(dfd, filename, t ? tv : NULL, 0); |
127 | } |
128 | |
129 | asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t) |
130 | { |
131 | return compat_sys_futimesat(AT_FDCWD, filename, t); |
132 | } |
133 | |
134 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) |
135 | { |
136 | compat_ino_t ino = stat->ino; |
137 | typeof(ubuf->st_uid) uid = 0; |
138 | typeof(ubuf->st_gid) gid = 0; |
139 | int err; |
140 | |
141 | SET_UID(uid, stat->uid); |
142 | SET_GID(gid, stat->gid); |
143 | |
144 | if ((u64) stat->size > MAX_NON_LFS || |
145 | !old_valid_dev(stat->dev) || |
146 | !old_valid_dev(stat->rdev)) |
147 | return -EOVERFLOW; |
148 | if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino) |
149 | return -EOVERFLOW; |
150 | |
151 | if (clear_user(ubuf, sizeof(*ubuf))) |
152 | return -EFAULT; |
153 | |
154 | err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev); |
155 | err |= __put_user(ino, &ubuf->st_ino); |
156 | err |= __put_user(stat->mode, &ubuf->st_mode); |
157 | err |= __put_user(stat->nlink, &ubuf->st_nlink); |
158 | err |= __put_user(uid, &ubuf->st_uid); |
159 | err |= __put_user(gid, &ubuf->st_gid); |
160 | err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev); |
161 | err |= __put_user(stat->size, &ubuf->st_size); |
162 | err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime); |
163 | err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec); |
164 | err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime); |
165 | err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec); |
166 | err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime); |
167 | err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec); |
168 | err |= __put_user(stat->blksize, &ubuf->st_blksize); |
169 | err |= __put_user(stat->blocks, &ubuf->st_blocks); |
170 | return err; |
171 | } |
172 | |
173 | asmlinkage long compat_sys_newstat(const char __user * filename, |
174 | struct compat_stat __user *statbuf) |
175 | { |
176 | struct kstat stat; |
177 | int error; |
178 | |
179 | error = vfs_stat(filename, &stat); |
180 | if (error) |
181 | return error; |
182 | return cp_compat_stat(&stat, statbuf); |
183 | } |
184 | |
185 | asmlinkage long compat_sys_newlstat(const char __user * filename, |
186 | struct compat_stat __user *statbuf) |
187 | { |
188 | struct kstat stat; |
189 | int error; |
190 | |
191 | error = vfs_lstat(filename, &stat); |
192 | if (error) |
193 | return error; |
194 | return cp_compat_stat(&stat, statbuf); |
195 | } |
196 | |
197 | #ifndef __ARCH_WANT_STAT64 |
198 | asmlinkage long compat_sys_newfstatat(unsigned int dfd, |
199 | const char __user *filename, |
200 | struct compat_stat __user *statbuf, int flag) |
201 | { |
202 | struct kstat stat; |
203 | int error; |
204 | |
205 | error = vfs_fstatat(dfd, filename, &stat, flag); |
206 | if (error) |
207 | return error; |
208 | return cp_compat_stat(&stat, statbuf); |
209 | } |
210 | #endif |
211 | |
212 | asmlinkage long compat_sys_newfstat(unsigned int fd, |
213 | struct compat_stat __user * statbuf) |
214 | { |
215 | struct kstat stat; |
216 | int error = vfs_fstat(fd, &stat); |
217 | |
218 | if (!error) |
219 | error = cp_compat_stat(&stat, statbuf); |
220 | return error; |
221 | } |
222 | |
223 | static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) |
224 | { |
225 | |
226 | if (sizeof ubuf->f_blocks == 4) { |
227 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
228 | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
229 | return -EOVERFLOW; |
230 | /* f_files and f_ffree may be -1; it's okay |
231 | * to stuff that into 32 bits */ |
232 | if (kbuf->f_files != 0xffffffffffffffffULL |
233 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
234 | return -EOVERFLOW; |
235 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
236 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
237 | return -EOVERFLOW; |
238 | } |
239 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
240 | __put_user(kbuf->f_type, &ubuf->f_type) || |
241 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
242 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
243 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
244 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
245 | __put_user(kbuf->f_files, &ubuf->f_files) || |
246 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
247 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
248 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
249 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
250 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
251 | __put_user(0, &ubuf->f_spare[0]) || |
252 | __put_user(0, &ubuf->f_spare[1]) || |
253 | __put_user(0, &ubuf->f_spare[2]) || |
254 | __put_user(0, &ubuf->f_spare[3]) || |
255 | __put_user(0, &ubuf->f_spare[4])) |
256 | return -EFAULT; |
257 | return 0; |
258 | } |
259 | |
260 | /* |
261 | * The following statfs calls are copies of code from fs/open.c and |
262 | * should be checked against those from time to time |
263 | */ |
264 | asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf) |
265 | { |
266 | struct path path; |
267 | int error; |
268 | |
269 | error = user_path(pathname, &path); |
270 | if (!error) { |
271 | struct kstatfs tmp; |
272 | error = vfs_statfs(&path, &tmp); |
273 | if (!error) |
274 | error = put_compat_statfs(buf, &tmp); |
275 | path_put(&path); |
276 | } |
277 | return error; |
278 | } |
279 | |
280 | asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf) |
281 | { |
282 | struct file * file; |
283 | struct kstatfs tmp; |
284 | int error; |
285 | |
286 | error = -EBADF; |
287 | file = fget(fd); |
288 | if (!file) |
289 | goto out; |
290 | error = vfs_statfs(&file->f_path, &tmp); |
291 | if (!error) |
292 | error = put_compat_statfs(buf, &tmp); |
293 | fput(file); |
294 | out: |
295 | return error; |
296 | } |
297 | |
298 | static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) |
299 | { |
300 | if (sizeof ubuf->f_blocks == 4) { |
301 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
302 | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
303 | return -EOVERFLOW; |
304 | /* f_files and f_ffree may be -1; it's okay |
305 | * to stuff that into 32 bits */ |
306 | if (kbuf->f_files != 0xffffffffffffffffULL |
307 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
308 | return -EOVERFLOW; |
309 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
310 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
311 | return -EOVERFLOW; |
312 | } |
313 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
314 | __put_user(kbuf->f_type, &ubuf->f_type) || |
315 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
316 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
317 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
318 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
319 | __put_user(kbuf->f_files, &ubuf->f_files) || |
320 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
321 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
322 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
323 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
324 | __put_user(kbuf->f_frsize, &ubuf->f_frsize)) |
325 | return -EFAULT; |
326 | return 0; |
327 | } |
328 | |
329 | asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf) |
330 | { |
331 | struct path path; |
332 | int error; |
333 | |
334 | if (sz != sizeof(*buf)) |
335 | return -EINVAL; |
336 | |
337 | error = user_path(pathname, &path); |
338 | if (!error) { |
339 | struct kstatfs tmp; |
340 | error = vfs_statfs(&path, &tmp); |
341 | if (!error) |
342 | error = put_compat_statfs64(buf, &tmp); |
343 | path_put(&path); |
344 | } |
345 | return error; |
346 | } |
347 | |
348 | asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf) |
349 | { |
350 | struct file * file; |
351 | struct kstatfs tmp; |
352 | int error; |
353 | |
354 | if (sz != sizeof(*buf)) |
355 | return -EINVAL; |
356 | |
357 | error = -EBADF; |
358 | file = fget(fd); |
359 | if (!file) |
360 | goto out; |
361 | error = vfs_statfs(&file->f_path, &tmp); |
362 | if (!error) |
363 | error = put_compat_statfs64(buf, &tmp); |
364 | fput(file); |
365 | out: |
366 | return error; |
367 | } |
368 | |
369 | /* |
370 | * This is a copy of sys_ustat, just dealing with a structure layout. |
371 | * Given how simple this syscall is that apporach is more maintainable |
372 | * than the various conversion hacks. |
373 | */ |
374 | asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u) |
375 | { |
376 | struct super_block *sb; |
377 | struct compat_ustat tmp; |
378 | struct kstatfs sbuf; |
379 | int err; |
380 | |
381 | sb = user_get_super(new_decode_dev(dev)); |
382 | if (!sb) |
383 | return -EINVAL; |
384 | err = statfs_by_dentry(sb->s_root, &sbuf); |
385 | drop_super(sb); |
386 | if (err) |
387 | return err; |
388 | |
389 | memset(&tmp, 0, sizeof(struct compat_ustat)); |
390 | tmp.f_tfree = sbuf.f_bfree; |
391 | tmp.f_tinode = sbuf.f_ffree; |
392 | if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) |
393 | return -EFAULT; |
394 | return 0; |
395 | } |
396 | |
397 | static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
398 | { |
399 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
400 | __get_user(kfl->l_type, &ufl->l_type) || |
401 | __get_user(kfl->l_whence, &ufl->l_whence) || |
402 | __get_user(kfl->l_start, &ufl->l_start) || |
403 | __get_user(kfl->l_len, &ufl->l_len) || |
404 | __get_user(kfl->l_pid, &ufl->l_pid)) |
405 | return -EFAULT; |
406 | return 0; |
407 | } |
408 | |
409 | static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
410 | { |
411 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
412 | __put_user(kfl->l_type, &ufl->l_type) || |
413 | __put_user(kfl->l_whence, &ufl->l_whence) || |
414 | __put_user(kfl->l_start, &ufl->l_start) || |
415 | __put_user(kfl->l_len, &ufl->l_len) || |
416 | __put_user(kfl->l_pid, &ufl->l_pid)) |
417 | return -EFAULT; |
418 | return 0; |
419 | } |
420 | |
421 | #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 |
422 | static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
423 | { |
424 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
425 | __get_user(kfl->l_type, &ufl->l_type) || |
426 | __get_user(kfl->l_whence, &ufl->l_whence) || |
427 | __get_user(kfl->l_start, &ufl->l_start) || |
428 | __get_user(kfl->l_len, &ufl->l_len) || |
429 | __get_user(kfl->l_pid, &ufl->l_pid)) |
430 | return -EFAULT; |
431 | return 0; |
432 | } |
433 | #endif |
434 | |
435 | #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 |
436 | static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
437 | { |
438 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
439 | __put_user(kfl->l_type, &ufl->l_type) || |
440 | __put_user(kfl->l_whence, &ufl->l_whence) || |
441 | __put_user(kfl->l_start, &ufl->l_start) || |
442 | __put_user(kfl->l_len, &ufl->l_len) || |
443 | __put_user(kfl->l_pid, &ufl->l_pid)) |
444 | return -EFAULT; |
445 | return 0; |
446 | } |
447 | #endif |
448 | |
449 | asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, |
450 | unsigned long arg) |
451 | { |
452 | mm_segment_t old_fs; |
453 | struct flock f; |
454 | long ret; |
455 | |
456 | switch (cmd) { |
457 | case F_GETLK: |
458 | case F_SETLK: |
459 | case F_SETLKW: |
460 | ret = get_compat_flock(&f, compat_ptr(arg)); |
461 | if (ret != 0) |
462 | break; |
463 | old_fs = get_fs(); |
464 | set_fs(KERNEL_DS); |
465 | ret = sys_fcntl(fd, cmd, (unsigned long)&f); |
466 | set_fs(old_fs); |
467 | if (cmd == F_GETLK && ret == 0) { |
468 | /* GETLK was successful and we need to return the data... |
469 | * but it needs to fit in the compat structure. |
470 | * l_start shouldn't be too big, unless the original |
471 | * start + end is greater than COMPAT_OFF_T_MAX, in which |
472 | * case the app was asking for trouble, so we return |
473 | * -EOVERFLOW in that case. |
474 | * l_len could be too big, in which case we just truncate it, |
475 | * and only allow the app to see that part of the conflicting |
476 | * lock that might make sense to it anyway |
477 | */ |
478 | |
479 | if (f.l_start > COMPAT_OFF_T_MAX) |
480 | ret = -EOVERFLOW; |
481 | if (f.l_len > COMPAT_OFF_T_MAX) |
482 | f.l_len = COMPAT_OFF_T_MAX; |
483 | if (ret == 0) |
484 | ret = put_compat_flock(&f, compat_ptr(arg)); |
485 | } |
486 | break; |
487 | |
488 | case F_GETLK64: |
489 | case F_SETLK64: |
490 | case F_SETLKW64: |
491 | ret = get_compat_flock64(&f, compat_ptr(arg)); |
492 | if (ret != 0) |
493 | break; |
494 | old_fs = get_fs(); |
495 | set_fs(KERNEL_DS); |
496 | ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK : |
497 | ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW), |
498 | (unsigned long)&f); |
499 | set_fs(old_fs); |
500 | if (cmd == F_GETLK64 && ret == 0) { |
501 | /* need to return lock information - see above for commentary */ |
502 | if (f.l_start > COMPAT_LOFF_T_MAX) |
503 | ret = -EOVERFLOW; |
504 | if (f.l_len > COMPAT_LOFF_T_MAX) |
505 | f.l_len = COMPAT_LOFF_T_MAX; |
506 | if (ret == 0) |
507 | ret = put_compat_flock64(&f, compat_ptr(arg)); |
508 | } |
509 | break; |
510 | |
511 | default: |
512 | ret = sys_fcntl(fd, cmd, arg); |
513 | break; |
514 | } |
515 | return ret; |
516 | } |
517 | |
518 | asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, |
519 | unsigned long arg) |
520 | { |
521 | if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64)) |
522 | return -EINVAL; |
523 | return compat_sys_fcntl64(fd, cmd, arg); |
524 | } |
525 | |
526 | asmlinkage long |
527 | compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p) |
528 | { |
529 | long ret; |
530 | aio_context_t ctx64; |
531 | |
532 | mm_segment_t oldfs = get_fs(); |
533 | if (unlikely(get_user(ctx64, ctx32p))) |
534 | return -EFAULT; |
535 | |
536 | set_fs(KERNEL_DS); |
537 | /* The __user pointer cast is valid because of the set_fs() */ |
538 | ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64); |
539 | set_fs(oldfs); |
540 | /* truncating is ok because it's a user address */ |
541 | if (!ret) |
542 | ret = put_user((u32) ctx64, ctx32p); |
543 | return ret; |
544 | } |
545 | |
546 | asmlinkage long |
547 | compat_sys_io_getevents(aio_context_t ctx_id, |
548 | unsigned long min_nr, |
549 | unsigned long nr, |
550 | struct io_event __user *events, |
551 | struct compat_timespec __user *timeout) |
552 | { |
553 | long ret; |
554 | struct timespec t; |
555 | struct timespec __user *ut = NULL; |
556 | |
557 | ret = -EFAULT; |
558 | if (unlikely(!access_ok(VERIFY_WRITE, events, |
559 | nr * sizeof(struct io_event)))) |
560 | goto out; |
561 | if (timeout) { |
562 | if (get_compat_timespec(&t, timeout)) |
563 | goto out; |
564 | |
565 | ut = compat_alloc_user_space(sizeof(*ut)); |
566 | if (copy_to_user(ut, &t, sizeof(t)) ) |
567 | goto out; |
568 | } |
569 | ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut); |
570 | out: |
571 | return ret; |
572 | } |
573 | |
574 | /* A write operation does a read from user space and vice versa */ |
575 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
576 | |
577 | ssize_t compat_rw_copy_check_uvector(int type, |
578 | const struct compat_iovec __user *uvector, unsigned long nr_segs, |
579 | unsigned long fast_segs, struct iovec *fast_pointer, |
580 | struct iovec **ret_pointer) |
581 | { |
582 | compat_ssize_t tot_len; |
583 | struct iovec *iov = *ret_pointer = fast_pointer; |
584 | ssize_t ret = 0; |
585 | int seg; |
586 | |
587 | /* |
588 | * SuS says "The readv() function *may* fail if the iovcnt argument |
589 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
590 | * traditionally returned zero for zero segments, so... |
591 | */ |
592 | if (nr_segs == 0) |
593 | goto out; |
594 | |
595 | ret = -EINVAL; |
596 | if (nr_segs > UIO_MAXIOV || nr_segs < 0) |
597 | goto out; |
598 | if (nr_segs > fast_segs) { |
599 | ret = -ENOMEM; |
600 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
601 | if (iov == NULL) { |
602 | *ret_pointer = fast_pointer; |
603 | goto out; |
604 | } |
605 | } |
606 | *ret_pointer = iov; |
607 | |
608 | /* |
609 | * Single unix specification: |
610 | * We should -EINVAL if an element length is not >= 0 and fitting an |
611 | * ssize_t. The total length is fitting an ssize_t |
612 | * |
613 | * Be careful here because iov_len is a size_t not an ssize_t |
614 | */ |
615 | tot_len = 0; |
616 | ret = -EINVAL; |
617 | for (seg = 0; seg < nr_segs; seg++) { |
618 | compat_ssize_t tmp = tot_len; |
619 | compat_uptr_t buf; |
620 | compat_ssize_t len; |
621 | |
622 | if (__get_user(len, &uvector->iov_len) || |
623 | __get_user(buf, &uvector->iov_base)) { |
624 | ret = -EFAULT; |
625 | goto out; |
626 | } |
627 | if (len < 0) /* size_t not fitting in compat_ssize_t .. */ |
628 | goto out; |
629 | tot_len += len; |
630 | if (tot_len < tmp) /* maths overflow on the compat_ssize_t */ |
631 | goto out; |
632 | if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) { |
633 | ret = -EFAULT; |
634 | goto out; |
635 | } |
636 | iov->iov_base = compat_ptr(buf); |
637 | iov->iov_len = (compat_size_t) len; |
638 | uvector++; |
639 | iov++; |
640 | } |
641 | ret = tot_len; |
642 | |
643 | out: |
644 | return ret; |
645 | } |
646 | |
647 | static inline long |
648 | copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64) |
649 | { |
650 | compat_uptr_t uptr; |
651 | int i; |
652 | |
653 | for (i = 0; i < nr; ++i) { |
654 | if (get_user(uptr, ptr32 + i)) |
655 | return -EFAULT; |
656 | if (put_user(compat_ptr(uptr), ptr64 + i)) |
657 | return -EFAULT; |
658 | } |
659 | return 0; |
660 | } |
661 | |
662 | #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) |
663 | |
664 | asmlinkage long |
665 | compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb) |
666 | { |
667 | struct iocb __user * __user *iocb64; |
668 | long ret; |
669 | |
670 | if (unlikely(nr < 0)) |
671 | return -EINVAL; |
672 | |
673 | if (nr > MAX_AIO_SUBMITS) |
674 | nr = MAX_AIO_SUBMITS; |
675 | |
676 | iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); |
677 | ret = copy_iocb(nr, iocb, iocb64); |
678 | if (!ret) |
679 | ret = do_io_submit(ctx_id, nr, iocb64, 1); |
680 | return ret; |
681 | } |
682 | |
683 | struct compat_ncp_mount_data { |
684 | compat_int_t version; |
685 | compat_uint_t ncp_fd; |
686 | __compat_uid_t mounted_uid; |
687 | compat_pid_t wdog_pid; |
688 | unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; |
689 | compat_uint_t time_out; |
690 | compat_uint_t retry_count; |
691 | compat_uint_t flags; |
692 | __compat_uid_t uid; |
693 | __compat_gid_t gid; |
694 | compat_mode_t file_mode; |
695 | compat_mode_t dir_mode; |
696 | }; |
697 | |
698 | struct compat_ncp_mount_data_v4 { |
699 | compat_int_t version; |
700 | compat_ulong_t flags; |
701 | compat_ulong_t mounted_uid; |
702 | compat_long_t wdog_pid; |
703 | compat_uint_t ncp_fd; |
704 | compat_uint_t time_out; |
705 | compat_uint_t retry_count; |
706 | compat_ulong_t uid; |
707 | compat_ulong_t gid; |
708 | compat_ulong_t file_mode; |
709 | compat_ulong_t dir_mode; |
710 | }; |
711 | |
712 | static void *do_ncp_super_data_conv(void *raw_data) |
713 | { |
714 | int version = *(unsigned int *)raw_data; |
715 | |
716 | if (version == 3) { |
717 | struct compat_ncp_mount_data *c_n = raw_data; |
718 | struct ncp_mount_data *n = raw_data; |
719 | |
720 | n->dir_mode = c_n->dir_mode; |
721 | n->file_mode = c_n->file_mode; |
722 | n->gid = c_n->gid; |
723 | n->uid = c_n->uid; |
724 | memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); |
725 | n->wdog_pid = c_n->wdog_pid; |
726 | n->mounted_uid = c_n->mounted_uid; |
727 | } else if (version == 4) { |
728 | struct compat_ncp_mount_data_v4 *c_n = raw_data; |
729 | struct ncp_mount_data_v4 *n = raw_data; |
730 | |
731 | n->dir_mode = c_n->dir_mode; |
732 | n->file_mode = c_n->file_mode; |
733 | n->gid = c_n->gid; |
734 | n->uid = c_n->uid; |
735 | n->retry_count = c_n->retry_count; |
736 | n->time_out = c_n->time_out; |
737 | n->ncp_fd = c_n->ncp_fd; |
738 | n->wdog_pid = c_n->wdog_pid; |
739 | n->mounted_uid = c_n->mounted_uid; |
740 | n->flags = c_n->flags; |
741 | } else if (version != 5) { |
742 | return NULL; |
743 | } |
744 | |
745 | return raw_data; |
746 | } |
747 | |
748 | struct compat_smb_mount_data { |
749 | compat_int_t version; |
750 | __compat_uid_t mounted_uid; |
751 | __compat_uid_t uid; |
752 | __compat_gid_t gid; |
753 | compat_mode_t file_mode; |
754 | compat_mode_t dir_mode; |
755 | }; |
756 | |
757 | static void *do_smb_super_data_conv(void *raw_data) |
758 | { |
759 | struct smb_mount_data *s = raw_data; |
760 | struct compat_smb_mount_data *c_s = raw_data; |
761 | |
762 | if (c_s->version != SMB_MOUNT_OLDVERSION) |
763 | goto out; |
764 | s->dir_mode = c_s->dir_mode; |
765 | s->file_mode = c_s->file_mode; |
766 | s->gid = c_s->gid; |
767 | s->uid = c_s->uid; |
768 | s->mounted_uid = c_s->mounted_uid; |
769 | out: |
770 | return raw_data; |
771 | } |
772 | |
773 | struct compat_nfs_string { |
774 | compat_uint_t len; |
775 | compat_uptr_t data; |
776 | }; |
777 | |
778 | static inline void compat_nfs_string(struct nfs_string *dst, |
779 | struct compat_nfs_string *src) |
780 | { |
781 | dst->data = compat_ptr(src->data); |
782 | dst->len = src->len; |
783 | } |
784 | |
785 | struct compat_nfs4_mount_data_v1 { |
786 | compat_int_t version; |
787 | compat_int_t flags; |
788 | compat_int_t rsize; |
789 | compat_int_t wsize; |
790 | compat_int_t timeo; |
791 | compat_int_t retrans; |
792 | compat_int_t acregmin; |
793 | compat_int_t acregmax; |
794 | compat_int_t acdirmin; |
795 | compat_int_t acdirmax; |
796 | struct compat_nfs_string client_addr; |
797 | struct compat_nfs_string mnt_path; |
798 | struct compat_nfs_string hostname; |
799 | compat_uint_t host_addrlen; |
800 | compat_uptr_t host_addr; |
801 | compat_int_t proto; |
802 | compat_int_t auth_flavourlen; |
803 | compat_uptr_t auth_flavours; |
804 | }; |
805 | |
806 | static int do_nfs4_super_data_conv(void *raw_data) |
807 | { |
808 | int version = *(compat_uint_t *) raw_data; |
809 | |
810 | if (version == 1) { |
811 | struct compat_nfs4_mount_data_v1 *raw = raw_data; |
812 | struct nfs4_mount_data *real = raw_data; |
813 | |
814 | /* copy the fields backwards */ |
815 | real->auth_flavours = compat_ptr(raw->auth_flavours); |
816 | real->auth_flavourlen = raw->auth_flavourlen; |
817 | real->proto = raw->proto; |
818 | real->host_addr = compat_ptr(raw->host_addr); |
819 | real->host_addrlen = raw->host_addrlen; |
820 | compat_nfs_string(&real->hostname, &raw->hostname); |
821 | compat_nfs_string(&real->mnt_path, &raw->mnt_path); |
822 | compat_nfs_string(&real->client_addr, &raw->client_addr); |
823 | real->acdirmax = raw->acdirmax; |
824 | real->acdirmin = raw->acdirmin; |
825 | real->acregmax = raw->acregmax; |
826 | real->acregmin = raw->acregmin; |
827 | real->retrans = raw->retrans; |
828 | real->timeo = raw->timeo; |
829 | real->wsize = raw->wsize; |
830 | real->rsize = raw->rsize; |
831 | real->flags = raw->flags; |
832 | real->version = raw->version; |
833 | } |
834 | |
835 | return 0; |
836 | } |
837 | |
838 | #define SMBFS_NAME "smbfs" |
839 | #define NCPFS_NAME "ncpfs" |
840 | #define NFS4_NAME "nfs4" |
841 | |
842 | asmlinkage long compat_sys_mount(const char __user * dev_name, |
843 | const char __user * dir_name, |
844 | const char __user * type, unsigned long flags, |
845 | const void __user * data) |
846 | { |
847 | char *kernel_type; |
848 | unsigned long data_page; |
849 | char *kernel_dev; |
850 | char *dir_page; |
851 | int retval; |
852 | |
853 | retval = copy_mount_string(type, &kernel_type); |
854 | if (retval < 0) |
855 | goto out; |
856 | |
857 | dir_page = getname(dir_name); |
858 | retval = PTR_ERR(dir_page); |
859 | if (IS_ERR(dir_page)) |
860 | goto out1; |
861 | |
862 | retval = copy_mount_string(dev_name, &kernel_dev); |
863 | if (retval < 0) |
864 | goto out2; |
865 | |
866 | retval = copy_mount_options(data, &data_page); |
867 | if (retval < 0) |
868 | goto out3; |
869 | |
870 | retval = -EINVAL; |
871 | |
872 | if (kernel_type && data_page) { |
873 | if (!strcmp(kernel_type, SMBFS_NAME)) { |
874 | do_smb_super_data_conv((void *)data_page); |
875 | } else if (!strcmp(kernel_type, NCPFS_NAME)) { |
876 | do_ncp_super_data_conv((void *)data_page); |
877 | } else if (!strcmp(kernel_type, NFS4_NAME)) { |
878 | if (do_nfs4_super_data_conv((void *) data_page)) |
879 | goto out4; |
880 | } |
881 | } |
882 | |
883 | retval = do_mount(kernel_dev, dir_page, kernel_type, |
884 | flags, (void*)data_page); |
885 | |
886 | out4: |
887 | free_page(data_page); |
888 | out3: |
889 | kfree(kernel_dev); |
890 | out2: |
891 | putname(dir_page); |
892 | out1: |
893 | kfree(kernel_type); |
894 | out: |
895 | return retval; |
896 | } |
897 | |
898 | struct compat_old_linux_dirent { |
899 | compat_ulong_t d_ino; |
900 | compat_ulong_t d_offset; |
901 | unsigned short d_namlen; |
902 | char d_name[1]; |
903 | }; |
904 | |
905 | struct compat_readdir_callback { |
906 | struct compat_old_linux_dirent __user *dirent; |
907 | int result; |
908 | }; |
909 | |
910 | static int compat_fillonedir(void *__buf, const char *name, int namlen, |
911 | loff_t offset, u64 ino, unsigned int d_type) |
912 | { |
913 | struct compat_readdir_callback *buf = __buf; |
914 | struct compat_old_linux_dirent __user *dirent; |
915 | compat_ulong_t d_ino; |
916 | |
917 | if (buf->result) |
918 | return -EINVAL; |
919 | d_ino = ino; |
920 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
921 | buf->result = -EOVERFLOW; |
922 | return -EOVERFLOW; |
923 | } |
924 | buf->result++; |
925 | dirent = buf->dirent; |
926 | if (!access_ok(VERIFY_WRITE, dirent, |
927 | (unsigned long)(dirent->d_name + namlen + 1) - |
928 | (unsigned long)dirent)) |
929 | goto efault; |
930 | if ( __put_user(d_ino, &dirent->d_ino) || |
931 | __put_user(offset, &dirent->d_offset) || |
932 | __put_user(namlen, &dirent->d_namlen) || |
933 | __copy_to_user(dirent->d_name, name, namlen) || |
934 | __put_user(0, dirent->d_name + namlen)) |
935 | goto efault; |
936 | return 0; |
937 | efault: |
938 | buf->result = -EFAULT; |
939 | return -EFAULT; |
940 | } |
941 | |
942 | asmlinkage long compat_sys_old_readdir(unsigned int fd, |
943 | struct compat_old_linux_dirent __user *dirent, unsigned int count) |
944 | { |
945 | int error; |
946 | struct file *file; |
947 | struct compat_readdir_callback buf; |
948 | |
949 | error = -EBADF; |
950 | file = fget(fd); |
951 | if (!file) |
952 | goto out; |
953 | |
954 | buf.result = 0; |
955 | buf.dirent = dirent; |
956 | |
957 | error = vfs_readdir(file, compat_fillonedir, &buf); |
958 | if (buf.result) |
959 | error = buf.result; |
960 | |
961 | fput(file); |
962 | out: |
963 | return error; |
964 | } |
965 | |
966 | struct compat_linux_dirent { |
967 | compat_ulong_t d_ino; |
968 | compat_ulong_t d_off; |
969 | unsigned short d_reclen; |
970 | char d_name[1]; |
971 | }; |
972 | |
973 | struct compat_getdents_callback { |
974 | struct compat_linux_dirent __user *current_dir; |
975 | struct compat_linux_dirent __user *previous; |
976 | int count; |
977 | int error; |
978 | }; |
979 | |
980 | static int compat_filldir(void *__buf, const char *name, int namlen, |
981 | loff_t offset, u64 ino, unsigned int d_type) |
982 | { |
983 | struct compat_linux_dirent __user * dirent; |
984 | struct compat_getdents_callback *buf = __buf; |
985 | compat_ulong_t d_ino; |
986 | int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + |
987 | namlen + 2, sizeof(compat_long_t)); |
988 | |
989 | buf->error = -EINVAL; /* only used if we fail.. */ |
990 | if (reclen > buf->count) |
991 | return -EINVAL; |
992 | d_ino = ino; |
993 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
994 | buf->error = -EOVERFLOW; |
995 | return -EOVERFLOW; |
996 | } |
997 | dirent = buf->previous; |
998 | if (dirent) { |
999 | if (__put_user(offset, &dirent->d_off)) |
1000 | goto efault; |
1001 | } |
1002 | dirent = buf->current_dir; |
1003 | if (__put_user(d_ino, &dirent->d_ino)) |
1004 | goto efault; |
1005 | if (__put_user(reclen, &dirent->d_reclen)) |
1006 | goto efault; |
1007 | if (copy_to_user(dirent->d_name, name, namlen)) |
1008 | goto efault; |
1009 | if (__put_user(0, dirent->d_name + namlen)) |
1010 | goto efault; |
1011 | if (__put_user(d_type, (char __user *) dirent + reclen - 1)) |
1012 | goto efault; |
1013 | buf->previous = dirent; |
1014 | dirent = (void __user *)dirent + reclen; |
1015 | buf->current_dir = dirent; |
1016 | buf->count -= reclen; |
1017 | return 0; |
1018 | efault: |
1019 | buf->error = -EFAULT; |
1020 | return -EFAULT; |
1021 | } |
1022 | |
1023 | asmlinkage long compat_sys_getdents(unsigned int fd, |
1024 | struct compat_linux_dirent __user *dirent, unsigned int count) |
1025 | { |
1026 | struct file * file; |
1027 | struct compat_linux_dirent __user * lastdirent; |
1028 | struct compat_getdents_callback buf; |
1029 | int error; |
1030 | |
1031 | error = -EFAULT; |
1032 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
1033 | goto out; |
1034 | |
1035 | error = -EBADF; |
1036 | file = fget(fd); |
1037 | if (!file) |
1038 | goto out; |
1039 | |
1040 | buf.current_dir = dirent; |
1041 | buf.previous = NULL; |
1042 | buf.count = count; |
1043 | buf.error = 0; |
1044 | |
1045 | error = vfs_readdir(file, compat_filldir, &buf); |
1046 | if (error >= 0) |
1047 | error = buf.error; |
1048 | lastdirent = buf.previous; |
1049 | if (lastdirent) { |
1050 | if (put_user(file->f_pos, &lastdirent->d_off)) |
1051 | error = -EFAULT; |
1052 | else |
1053 | error = count - buf.count; |
1054 | } |
1055 | fput(file); |
1056 | out: |
1057 | return error; |
1058 | } |
1059 | |
1060 | #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64 |
1061 | |
1062 | struct compat_getdents_callback64 { |
1063 | struct linux_dirent64 __user *current_dir; |
1064 | struct linux_dirent64 __user *previous; |
1065 | int count; |
1066 | int error; |
1067 | }; |
1068 | |
1069 | static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset, |
1070 | u64 ino, unsigned int d_type) |
1071 | { |
1072 | struct linux_dirent64 __user *dirent; |
1073 | struct compat_getdents_callback64 *buf = __buf; |
1074 | int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, |
1075 | sizeof(u64)); |
1076 | u64 off; |
1077 | |
1078 | buf->error = -EINVAL; /* only used if we fail.. */ |
1079 | if (reclen > buf->count) |
1080 | return -EINVAL; |
1081 | dirent = buf->previous; |
1082 | |
1083 | if (dirent) { |
1084 | if (__put_user_unaligned(offset, &dirent->d_off)) |
1085 | goto efault; |
1086 | } |
1087 | dirent = buf->current_dir; |
1088 | if (__put_user_unaligned(ino, &dirent->d_ino)) |
1089 | goto efault; |
1090 | off = 0; |
1091 | if (__put_user_unaligned(off, &dirent->d_off)) |
1092 | goto efault; |
1093 | if (__put_user(reclen, &dirent->d_reclen)) |
1094 | goto efault; |
1095 | if (__put_user(d_type, &dirent->d_type)) |
1096 | goto efault; |
1097 | if (copy_to_user(dirent->d_name, name, namlen)) |
1098 | goto efault; |
1099 | if (__put_user(0, dirent->d_name + namlen)) |
1100 | goto efault; |
1101 | buf->previous = dirent; |
1102 | dirent = (void __user *)dirent + reclen; |
1103 | buf->current_dir = dirent; |
1104 | buf->count -= reclen; |
1105 | return 0; |
1106 | efault: |
1107 | buf->error = -EFAULT; |
1108 | return -EFAULT; |
1109 | } |
1110 | |
1111 | asmlinkage long compat_sys_getdents64(unsigned int fd, |
1112 | struct linux_dirent64 __user * dirent, unsigned int count) |
1113 | { |
1114 | struct file * file; |
1115 | struct linux_dirent64 __user * lastdirent; |
1116 | struct compat_getdents_callback64 buf; |
1117 | int error; |
1118 | |
1119 | error = -EFAULT; |
1120 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
1121 | goto out; |
1122 | |
1123 | error = -EBADF; |
1124 | file = fget(fd); |
1125 | if (!file) |
1126 | goto out; |
1127 | |
1128 | buf.current_dir = dirent; |
1129 | buf.previous = NULL; |
1130 | buf.count = count; |
1131 | buf.error = 0; |
1132 | |
1133 | error = vfs_readdir(file, compat_filldir64, &buf); |
1134 | if (error >= 0) |
1135 | error = buf.error; |
1136 | lastdirent = buf.previous; |
1137 | if (lastdirent) { |
1138 | typeof(lastdirent->d_off) d_off = file->f_pos; |
1139 | if (__put_user_unaligned(d_off, &lastdirent->d_off)) |
1140 | error = -EFAULT; |
1141 | else |
1142 | error = count - buf.count; |
1143 | } |
1144 | fput(file); |
1145 | out: |
1146 | return error; |
1147 | } |
1148 | #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */ |
1149 | |
1150 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
1151 | const struct compat_iovec __user *uvector, |
1152 | unsigned long nr_segs, loff_t *pos) |
1153 | { |
1154 | compat_ssize_t tot_len; |
1155 | struct iovec iovstack[UIO_FASTIOV]; |
1156 | struct iovec *iov = iovstack; |
1157 | ssize_t ret; |
1158 | io_fn_t fn; |
1159 | iov_fn_t fnv; |
1160 | |
1161 | ret = -EINVAL; |
1162 | if (!file->f_op) |
1163 | goto out; |
1164 | |
1165 | ret = -EFAULT; |
1166 | if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) |
1167 | goto out; |
1168 | |
1169 | tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
1170 | UIO_FASTIOV, iovstack, &iov); |
1171 | if (tot_len == 0) { |
1172 | ret = 0; |
1173 | goto out; |
1174 | } |
1175 | |
1176 | ret = rw_verify_area(type, file, pos, tot_len); |
1177 | if (ret < 0) |
1178 | goto out; |
1179 | |
1180 | fnv = NULL; |
1181 | if (type == READ) { |
1182 | fn = file->f_op->read; |
1183 | fnv = file->f_op->aio_read; |
1184 | } else { |
1185 | fn = (io_fn_t)file->f_op->write; |
1186 | fnv = file->f_op->aio_write; |
1187 | } |
1188 | |
1189 | if (fnv) |
1190 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
1191 | pos, fnv); |
1192 | else |
1193 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
1194 | |
1195 | out: |
1196 | if (iov != iovstack) |
1197 | kfree(iov); |
1198 | if ((ret + (type == READ)) > 0) { |
1199 | if (type == READ) |
1200 | fsnotify_access(file); |
1201 | else |
1202 | fsnotify_modify(file); |
1203 | } |
1204 | return ret; |
1205 | } |
1206 | |
1207 | static size_t compat_readv(struct file *file, |
1208 | const struct compat_iovec __user *vec, |
1209 | unsigned long vlen, loff_t *pos) |
1210 | { |
1211 | ssize_t ret = -EBADF; |
1212 | |
1213 | if (!(file->f_mode & FMODE_READ)) |
1214 | goto out; |
1215 | |
1216 | ret = -EINVAL; |
1217 | if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
1218 | goto out; |
1219 | |
1220 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
1221 | |
1222 | out: |
1223 | if (ret > 0) |
1224 | add_rchar(current, ret); |
1225 | inc_syscr(current); |
1226 | return ret; |
1227 | } |
1228 | |
1229 | asmlinkage ssize_t |
1230 | compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, |
1231 | unsigned long vlen) |
1232 | { |
1233 | struct file *file; |
1234 | int fput_needed; |
1235 | ssize_t ret; |
1236 | |
1237 | file = fget_light(fd, &fput_needed); |
1238 | if (!file) |
1239 | return -EBADF; |
1240 | ret = compat_readv(file, vec, vlen, &file->f_pos); |
1241 | fput_light(file, fput_needed); |
1242 | return ret; |
1243 | } |
1244 | |
1245 | asmlinkage ssize_t |
1246 | compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec, |
1247 | unsigned long vlen, u32 pos_low, u32 pos_high) |
1248 | { |
1249 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1250 | struct file *file; |
1251 | int fput_needed; |
1252 | ssize_t ret; |
1253 | |
1254 | if (pos < 0) |
1255 | return -EINVAL; |
1256 | file = fget_light(fd, &fput_needed); |
1257 | if (!file) |
1258 | return -EBADF; |
1259 | ret = compat_readv(file, vec, vlen, &pos); |
1260 | fput_light(file, fput_needed); |
1261 | return ret; |
1262 | } |
1263 | |
1264 | static size_t compat_writev(struct file *file, |
1265 | const struct compat_iovec __user *vec, |
1266 | unsigned long vlen, loff_t *pos) |
1267 | { |
1268 | ssize_t ret = -EBADF; |
1269 | |
1270 | if (!(file->f_mode & FMODE_WRITE)) |
1271 | goto out; |
1272 | |
1273 | ret = -EINVAL; |
1274 | if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
1275 | goto out; |
1276 | |
1277 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
1278 | |
1279 | out: |
1280 | if (ret > 0) |
1281 | add_wchar(current, ret); |
1282 | inc_syscw(current); |
1283 | return ret; |
1284 | } |
1285 | |
1286 | asmlinkage ssize_t |
1287 | compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, |
1288 | unsigned long vlen) |
1289 | { |
1290 | struct file *file; |
1291 | int fput_needed; |
1292 | ssize_t ret; |
1293 | |
1294 | file = fget_light(fd, &fput_needed); |
1295 | if (!file) |
1296 | return -EBADF; |
1297 | ret = compat_writev(file, vec, vlen, &file->f_pos); |
1298 | fput_light(file, fput_needed); |
1299 | return ret; |
1300 | } |
1301 | |
1302 | asmlinkage ssize_t |
1303 | compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec, |
1304 | unsigned long vlen, u32 pos_low, u32 pos_high) |
1305 | { |
1306 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1307 | struct file *file; |
1308 | int fput_needed; |
1309 | ssize_t ret; |
1310 | |
1311 | if (pos < 0) |
1312 | return -EINVAL; |
1313 | file = fget_light(fd, &fput_needed); |
1314 | if (!file) |
1315 | return -EBADF; |
1316 | ret = compat_writev(file, vec, vlen, &pos); |
1317 | fput_light(file, fput_needed); |
1318 | return ret; |
1319 | } |
1320 | |
1321 | asmlinkage long |
1322 | compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, |
1323 | unsigned int nr_segs, unsigned int flags) |
1324 | { |
1325 | unsigned i; |
1326 | struct iovec __user *iov; |
1327 | if (nr_segs > UIO_MAXIOV) |
1328 | return -EINVAL; |
1329 | iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); |
1330 | for (i = 0; i < nr_segs; i++) { |
1331 | struct compat_iovec v; |
1332 | if (get_user(v.iov_base, &iov32[i].iov_base) || |
1333 | get_user(v.iov_len, &iov32[i].iov_len) || |
1334 | put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || |
1335 | put_user(v.iov_len, &iov[i].iov_len)) |
1336 | return -EFAULT; |
1337 | } |
1338 | return sys_vmsplice(fd, iov, nr_segs, flags); |
1339 | } |
1340 | |
1341 | /* |
1342 | * Exactly like fs/open.c:sys_open(), except that it doesn't set the |
1343 | * O_LARGEFILE flag. |
1344 | */ |
1345 | asmlinkage long |
1346 | compat_sys_open(const char __user *filename, int flags, int mode) |
1347 | { |
1348 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
1349 | } |
1350 | |
1351 | /* |
1352 | * Exactly like fs/open.c:sys_openat(), except that it doesn't set the |
1353 | * O_LARGEFILE flag. |
1354 | */ |
1355 | asmlinkage long |
1356 | compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode) |
1357 | { |
1358 | return do_sys_open(dfd, filename, flags, mode); |
1359 | } |
1360 | |
1361 | /* |
1362 | * compat_count() counts the number of arguments/envelopes. It is basically |
1363 | * a copy of count() from fs/exec.c, except that it works with 32 bit argv |
1364 | * and envp pointers. |
1365 | */ |
1366 | static int compat_count(compat_uptr_t __user *argv, int max) |
1367 | { |
1368 | int i = 0; |
1369 | |
1370 | if (argv != NULL) { |
1371 | for (;;) { |
1372 | compat_uptr_t p; |
1373 | |
1374 | if (get_user(p, argv)) |
1375 | return -EFAULT; |
1376 | if (!p) |
1377 | break; |
1378 | argv++; |
1379 | if (i++ >= max) |
1380 | return -E2BIG; |
1381 | } |
1382 | } |
1383 | return i; |
1384 | } |
1385 | |
1386 | /* |
1387 | * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c |
1388 | * except that it works with 32 bit argv and envp pointers. |
1389 | */ |
1390 | static int compat_copy_strings(int argc, compat_uptr_t __user *argv, |
1391 | struct linux_binprm *bprm) |
1392 | { |
1393 | struct page *kmapped_page = NULL; |
1394 | char *kaddr = NULL; |
1395 | unsigned long kpos = 0; |
1396 | int ret; |
1397 | |
1398 | while (argc-- > 0) { |
1399 | compat_uptr_t str; |
1400 | int len; |
1401 | unsigned long pos; |
1402 | |
1403 | if (get_user(str, argv+argc) || |
1404 | !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) { |
1405 | ret = -EFAULT; |
1406 | goto out; |
1407 | } |
1408 | |
1409 | if (len > MAX_ARG_STRLEN) { |
1410 | ret = -E2BIG; |
1411 | goto out; |
1412 | } |
1413 | |
1414 | /* We're going to work our way backwords. */ |
1415 | pos = bprm->p; |
1416 | str += len; |
1417 | bprm->p -= len; |
1418 | |
1419 | while (len > 0) { |
1420 | int offset, bytes_to_copy; |
1421 | |
1422 | offset = pos % PAGE_SIZE; |
1423 | if (offset == 0) |
1424 | offset = PAGE_SIZE; |
1425 | |
1426 | bytes_to_copy = offset; |
1427 | if (bytes_to_copy > len) |
1428 | bytes_to_copy = len; |
1429 | |
1430 | offset -= bytes_to_copy; |
1431 | pos -= bytes_to_copy; |
1432 | str -= bytes_to_copy; |
1433 | len -= bytes_to_copy; |
1434 | |
1435 | if (!kmapped_page || kpos != (pos & PAGE_MASK)) { |
1436 | struct page *page; |
1437 | |
1438 | #ifdef CONFIG_STACK_GROWSUP |
1439 | ret = expand_stack_downwards(bprm->vma, pos); |
1440 | if (ret < 0) { |
1441 | /* We've exceed the stack rlimit. */ |
1442 | ret = -E2BIG; |
1443 | goto out; |
1444 | } |
1445 | #endif |
1446 | ret = get_user_pages(current, bprm->mm, pos, |
1447 | 1, 1, 1, &page, NULL); |
1448 | if (ret <= 0) { |
1449 | /* We've exceed the stack rlimit. */ |
1450 | ret = -E2BIG; |
1451 | goto out; |
1452 | } |
1453 | |
1454 | if (kmapped_page) { |
1455 | flush_kernel_dcache_page(kmapped_page); |
1456 | kunmap(kmapped_page); |
1457 | put_page(kmapped_page); |
1458 | } |
1459 | kmapped_page = page; |
1460 | kaddr = kmap(kmapped_page); |
1461 | kpos = pos & PAGE_MASK; |
1462 | flush_cache_page(bprm->vma, kpos, |
1463 | page_to_pfn(kmapped_page)); |
1464 | } |
1465 | if (copy_from_user(kaddr+offset, compat_ptr(str), |
1466 | bytes_to_copy)) { |
1467 | ret = -EFAULT; |
1468 | goto out; |
1469 | } |
1470 | } |
1471 | } |
1472 | ret = 0; |
1473 | out: |
1474 | if (kmapped_page) { |
1475 | flush_kernel_dcache_page(kmapped_page); |
1476 | kunmap(kmapped_page); |
1477 | put_page(kmapped_page); |
1478 | } |
1479 | return ret; |
1480 | } |
1481 | |
1482 | /* |
1483 | * compat_do_execve() is mostly a copy of do_execve(), with the exception |
1484 | * that it processes 32 bit argv and envp pointers. |
1485 | */ |
1486 | int compat_do_execve(char * filename, |
1487 | compat_uptr_t __user *argv, |
1488 | compat_uptr_t __user *envp, |
1489 | struct pt_regs * regs) |
1490 | { |
1491 | struct linux_binprm *bprm; |
1492 | struct file *file; |
1493 | struct files_struct *displaced; |
1494 | bool clear_in_exec; |
1495 | int retval; |
1496 | |
1497 | retval = unshare_files(&displaced); |
1498 | if (retval) |
1499 | goto out_ret; |
1500 | |
1501 | retval = -ENOMEM; |
1502 | bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); |
1503 | if (!bprm) |
1504 | goto out_files; |
1505 | |
1506 | retval = prepare_bprm_creds(bprm); |
1507 | if (retval) |
1508 | goto out_free; |
1509 | |
1510 | retval = check_unsafe_exec(bprm); |
1511 | if (retval < 0) |
1512 | goto out_free; |
1513 | clear_in_exec = retval; |
1514 | current->in_execve = 1; |
1515 | |
1516 | file = open_exec(filename); |
1517 | retval = PTR_ERR(file); |
1518 | if (IS_ERR(file)) |
1519 | goto out_unmark; |
1520 | |
1521 | sched_exec(); |
1522 | |
1523 | bprm->file = file; |
1524 | bprm->filename = filename; |
1525 | bprm->interp = filename; |
1526 | |
1527 | retval = bprm_mm_init(bprm); |
1528 | if (retval) |
1529 | goto out_file; |
1530 | |
1531 | bprm->argc = compat_count(argv, MAX_ARG_STRINGS); |
1532 | if ((retval = bprm->argc) < 0) |
1533 | goto out; |
1534 | |
1535 | bprm->envc = compat_count(envp, MAX_ARG_STRINGS); |
1536 | if ((retval = bprm->envc) < 0) |
1537 | goto out; |
1538 | |
1539 | retval = prepare_binprm(bprm); |
1540 | if (retval < 0) |
1541 | goto out; |
1542 | |
1543 | retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1544 | if (retval < 0) |
1545 | goto out; |
1546 | |
1547 | bprm->exec = bprm->p; |
1548 | retval = compat_copy_strings(bprm->envc, envp, bprm); |
1549 | if (retval < 0) |
1550 | goto out; |
1551 | |
1552 | retval = compat_copy_strings(bprm->argc, argv, bprm); |
1553 | if (retval < 0) |
1554 | goto out; |
1555 | |
1556 | retval = search_binary_handler(bprm, regs); |
1557 | if (retval < 0) |
1558 | goto out; |
1559 | |
1560 | /* execve succeeded */ |
1561 | current->fs->in_exec = 0; |
1562 | current->in_execve = 0; |
1563 | acct_update_integrals(current); |
1564 | free_bprm(bprm); |
1565 | if (displaced) |
1566 | put_files_struct(displaced); |
1567 | return retval; |
1568 | |
1569 | out: |
1570 | if (bprm->mm) |
1571 | mmput(bprm->mm); |
1572 | |
1573 | out_file: |
1574 | if (bprm->file) { |
1575 | allow_write_access(bprm->file); |
1576 | fput(bprm->file); |
1577 | } |
1578 | |
1579 | out_unmark: |
1580 | if (clear_in_exec) |
1581 | current->fs->in_exec = 0; |
1582 | current->in_execve = 0; |
1583 | |
1584 | out_free: |
1585 | free_bprm(bprm); |
1586 | |
1587 | out_files: |
1588 | if (displaced) |
1589 | reset_files_struct(displaced); |
1590 | out_ret: |
1591 | return retval; |
1592 | } |
1593 | |
1594 | #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
1595 | |
1596 | static int poll_select_copy_remaining(struct timespec *end_time, void __user *p, |
1597 | int timeval, int ret) |
1598 | { |
1599 | struct timespec ts; |
1600 | |
1601 | if (!p) |
1602 | return ret; |
1603 | |
1604 | if (current->personality & STICKY_TIMEOUTS) |
1605 | goto sticky; |
1606 | |
1607 | /* No update for zero timeout */ |
1608 | if (!end_time->tv_sec && !end_time->tv_nsec) |
1609 | return ret; |
1610 | |
1611 | ktime_get_ts(&ts); |
1612 | ts = timespec_sub(*end_time, ts); |
1613 | if (ts.tv_sec < 0) |
1614 | ts.tv_sec = ts.tv_nsec = 0; |
1615 | |
1616 | if (timeval) { |
1617 | struct compat_timeval rtv; |
1618 | |
1619 | rtv.tv_sec = ts.tv_sec; |
1620 | rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; |
1621 | |
1622 | if (!copy_to_user(p, &rtv, sizeof(rtv))) |
1623 | return ret; |
1624 | } else { |
1625 | struct compat_timespec rts; |
1626 | |
1627 | rts.tv_sec = ts.tv_sec; |
1628 | rts.tv_nsec = ts.tv_nsec; |
1629 | |
1630 | if (!copy_to_user(p, &rts, sizeof(rts))) |
1631 | return ret; |
1632 | } |
1633 | /* |
1634 | * If an application puts its timeval in read-only memory, we |
1635 | * don't want the Linux-specific update to the timeval to |
1636 | * cause a fault after the select has completed |
1637 | * successfully. However, because we're not updating the |
1638 | * timeval, we can't restart the system call. |
1639 | */ |
1640 | |
1641 | sticky: |
1642 | if (ret == -ERESTARTNOHAND) |
1643 | ret = -EINTR; |
1644 | return ret; |
1645 | } |
1646 | |
1647 | /* |
1648 | * Ooo, nasty. We need here to frob 32-bit unsigned longs to |
1649 | * 64-bit unsigned longs. |
1650 | */ |
1651 | static |
1652 | int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1653 | unsigned long *fdset) |
1654 | { |
1655 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1656 | if (ufdset) { |
1657 | unsigned long odd; |
1658 | |
1659 | if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) |
1660 | return -EFAULT; |
1661 | |
1662 | odd = nr & 1UL; |
1663 | nr &= ~1UL; |
1664 | while (nr) { |
1665 | unsigned long h, l; |
1666 | if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) |
1667 | return -EFAULT; |
1668 | ufdset += 2; |
1669 | *fdset++ = h << 32 | l; |
1670 | nr -= 2; |
1671 | } |
1672 | if (odd && __get_user(*fdset, ufdset)) |
1673 | return -EFAULT; |
1674 | } else { |
1675 | /* Tricky, must clear full unsigned long in the |
1676 | * kernel fdset at the end, this makes sure that |
1677 | * actually happens. |
1678 | */ |
1679 | memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); |
1680 | } |
1681 | return 0; |
1682 | } |
1683 | |
1684 | static |
1685 | int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1686 | unsigned long *fdset) |
1687 | { |
1688 | unsigned long odd; |
1689 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1690 | |
1691 | if (!ufdset) |
1692 | return 0; |
1693 | |
1694 | odd = nr & 1UL; |
1695 | nr &= ~1UL; |
1696 | while (nr) { |
1697 | unsigned long h, l; |
1698 | l = *fdset++; |
1699 | h = l >> 32; |
1700 | if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) |
1701 | return -EFAULT; |
1702 | ufdset += 2; |
1703 | nr -= 2; |
1704 | } |
1705 | if (odd && __put_user(*fdset, ufdset)) |
1706 | return -EFAULT; |
1707 | return 0; |
1708 | } |
1709 | |
1710 | |
1711 | /* |
1712 | * This is a virtual copy of sys_select from fs/select.c and probably |
1713 | * should be compared to it from time to time |
1714 | */ |
1715 | |
1716 | /* |
1717 | * We can actually return ERESTARTSYS instead of EINTR, but I'd |
1718 | * like to be certain this leads to no problems. So I return |
1719 | * EINTR just for safety. |
1720 | * |
1721 | * Update: ERESTARTSYS breaks at least the xview clock binary, so |
1722 | * I'm trying ERESTARTNOHAND which restart only when you want to. |
1723 | */ |
1724 | #define MAX_SELECT_SECONDS \ |
1725 | ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1) |
1726 | |
1727 | int compat_core_sys_select(int n, compat_ulong_t __user *inp, |
1728 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1729 | struct timespec *end_time) |
1730 | { |
1731 | fd_set_bits fds; |
1732 | void *bits; |
1733 | int size, max_fds, ret = -EINVAL; |
1734 | struct fdtable *fdt; |
1735 | long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; |
1736 | |
1737 | if (n < 0) |
1738 | goto out_nofds; |
1739 | |
1740 | /* max_fds can increase, so grab it once to avoid race */ |
1741 | rcu_read_lock(); |
1742 | fdt = files_fdtable(current->files); |
1743 | max_fds = fdt->max_fds; |
1744 | rcu_read_unlock(); |
1745 | if (n > max_fds) |
1746 | n = max_fds; |
1747 | |
1748 | /* |
1749 | * We need 6 bitmaps (in/out/ex for both incoming and outgoing), |
1750 | * since we used fdset we need to allocate memory in units of |
1751 | * long-words. |
1752 | */ |
1753 | size = FDS_BYTES(n); |
1754 | bits = stack_fds; |
1755 | if (size > sizeof(stack_fds) / 6) { |
1756 | bits = kmalloc(6 * size, GFP_KERNEL); |
1757 | ret = -ENOMEM; |
1758 | if (!bits) |
1759 | goto out_nofds; |
1760 | } |
1761 | fds.in = (unsigned long *) bits; |
1762 | fds.out = (unsigned long *) (bits + size); |
1763 | fds.ex = (unsigned long *) (bits + 2*size); |
1764 | fds.res_in = (unsigned long *) (bits + 3*size); |
1765 | fds.res_out = (unsigned long *) (bits + 4*size); |
1766 | fds.res_ex = (unsigned long *) (bits + 5*size); |
1767 | |
1768 | if ((ret = compat_get_fd_set(n, inp, fds.in)) || |
1769 | (ret = compat_get_fd_set(n, outp, fds.out)) || |
1770 | (ret = compat_get_fd_set(n, exp, fds.ex))) |
1771 | goto out; |
1772 | zero_fd_set(n, fds.res_in); |
1773 | zero_fd_set(n, fds.res_out); |
1774 | zero_fd_set(n, fds.res_ex); |
1775 | |
1776 | ret = do_select(n, &fds, end_time); |
1777 | |
1778 | if (ret < 0) |
1779 | goto out; |
1780 | if (!ret) { |
1781 | ret = -ERESTARTNOHAND; |
1782 | if (signal_pending(current)) |
1783 | goto out; |
1784 | ret = 0; |
1785 | } |
1786 | |
1787 | if (compat_set_fd_set(n, inp, fds.res_in) || |
1788 | compat_set_fd_set(n, outp, fds.res_out) || |
1789 | compat_set_fd_set(n, exp, fds.res_ex)) |
1790 | ret = -EFAULT; |
1791 | out: |
1792 | if (bits != stack_fds) |
1793 | kfree(bits); |
1794 | out_nofds: |
1795 | return ret; |
1796 | } |
1797 | |
1798 | asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, |
1799 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1800 | struct compat_timeval __user *tvp) |
1801 | { |
1802 | struct timespec end_time, *to = NULL; |
1803 | struct compat_timeval tv; |
1804 | int ret; |
1805 | |
1806 | if (tvp) { |
1807 | if (copy_from_user(&tv, tvp, sizeof(tv))) |
1808 | return -EFAULT; |
1809 | |
1810 | to = &end_time; |
1811 | if (poll_select_set_timeout(to, |
1812 | tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), |
1813 | (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) |
1814 | return -EINVAL; |
1815 | } |
1816 | |
1817 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1818 | ret = poll_select_copy_remaining(&end_time, tvp, 1, ret); |
1819 | |
1820 | return ret; |
1821 | } |
1822 | |
1823 | struct compat_sel_arg_struct { |
1824 | compat_ulong_t n; |
1825 | compat_uptr_t inp; |
1826 | compat_uptr_t outp; |
1827 | compat_uptr_t exp; |
1828 | compat_uptr_t tvp; |
1829 | }; |
1830 | |
1831 | asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg) |
1832 | { |
1833 | struct compat_sel_arg_struct a; |
1834 | |
1835 | if (copy_from_user(&a, arg, sizeof(a))) |
1836 | return -EFAULT; |
1837 | return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), |
1838 | compat_ptr(a.exp), compat_ptr(a.tvp)); |
1839 | } |
1840 | |
1841 | #ifdef HAVE_SET_RESTORE_SIGMASK |
1842 | static long do_compat_pselect(int n, compat_ulong_t __user *inp, |
1843 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1844 | struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, |
1845 | compat_size_t sigsetsize) |
1846 | { |
1847 | compat_sigset_t ss32; |
1848 | sigset_t ksigmask, sigsaved; |
1849 | struct compat_timespec ts; |
1850 | struct timespec end_time, *to = NULL; |
1851 | int ret; |
1852 | |
1853 | if (tsp) { |
1854 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
1855 | return -EFAULT; |
1856 | |
1857 | to = &end_time; |
1858 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
1859 | return -EINVAL; |
1860 | } |
1861 | |
1862 | if (sigmask) { |
1863 | if (sigsetsize != sizeof(compat_sigset_t)) |
1864 | return -EINVAL; |
1865 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
1866 | return -EFAULT; |
1867 | sigset_from_compat(&ksigmask, &ss32); |
1868 | |
1869 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1870 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
1871 | } |
1872 | |
1873 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1874 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
1875 | |
1876 | if (ret == -ERESTARTNOHAND) { |
1877 | /* |
1878 | * Don't restore the signal mask yet. Let do_signal() deliver |
1879 | * the signal on the way back to userspace, before the signal |
1880 | * mask is restored. |
1881 | */ |
1882 | if (sigmask) { |
1883 | memcpy(¤t->saved_sigmask, &sigsaved, |
1884 | sizeof(sigsaved)); |
1885 | set_restore_sigmask(); |
1886 | } |
1887 | } else if (sigmask) |
1888 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
1889 | |
1890 | return ret; |
1891 | } |
1892 | |
1893 | asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp, |
1894 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1895 | struct compat_timespec __user *tsp, void __user *sig) |
1896 | { |
1897 | compat_size_t sigsetsize = 0; |
1898 | compat_uptr_t up = 0; |
1899 | |
1900 | if (sig) { |
1901 | if (!access_ok(VERIFY_READ, sig, |
1902 | sizeof(compat_uptr_t)+sizeof(compat_size_t)) || |
1903 | __get_user(up, (compat_uptr_t __user *)sig) || |
1904 | __get_user(sigsetsize, |
1905 | (compat_size_t __user *)(sig+sizeof(up)))) |
1906 | return -EFAULT; |
1907 | } |
1908 | return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), |
1909 | sigsetsize); |
1910 | } |
1911 | |
1912 | asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, |
1913 | unsigned int nfds, struct compat_timespec __user *tsp, |
1914 | const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) |
1915 | { |
1916 | compat_sigset_t ss32; |
1917 | sigset_t ksigmask, sigsaved; |
1918 | struct compat_timespec ts; |
1919 | struct timespec end_time, *to = NULL; |
1920 | int ret; |
1921 | |
1922 | if (tsp) { |
1923 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
1924 | return -EFAULT; |
1925 | |
1926 | to = &end_time; |
1927 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
1928 | return -EINVAL; |
1929 | } |
1930 | |
1931 | if (sigmask) { |
1932 | if (sigsetsize != sizeof(compat_sigset_t)) |
1933 | return -EINVAL; |
1934 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
1935 | return -EFAULT; |
1936 | sigset_from_compat(&ksigmask, &ss32); |
1937 | |
1938 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1939 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
1940 | } |
1941 | |
1942 | ret = do_sys_poll(ufds, nfds, to); |
1943 | |
1944 | /* We can restart this syscall, usually */ |
1945 | if (ret == -EINTR) { |
1946 | /* |
1947 | * Don't restore the signal mask yet. Let do_signal() deliver |
1948 | * the signal on the way back to userspace, before the signal |
1949 | * mask is restored. |
1950 | */ |
1951 | if (sigmask) { |
1952 | memcpy(¤t->saved_sigmask, &sigsaved, |
1953 | sizeof(sigsaved)); |
1954 | set_restore_sigmask(); |
1955 | } |
1956 | ret = -ERESTARTNOHAND; |
1957 | } else if (sigmask) |
1958 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
1959 | |
1960 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
1961 | |
1962 | return ret; |
1963 | } |
1964 | #endif /* HAVE_SET_RESTORE_SIGMASK */ |
1965 | |
1966 | #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE) |
1967 | /* Stuff for NFS server syscalls... */ |
1968 | struct compat_nfsctl_svc { |
1969 | u16 svc32_port; |
1970 | s32 svc32_nthreads; |
1971 | }; |
1972 | |
1973 | struct compat_nfsctl_client { |
1974 | s8 cl32_ident[NFSCLNT_IDMAX+1]; |
1975 | s32 cl32_naddr; |
1976 | struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX]; |
1977 | s32 cl32_fhkeytype; |
1978 | s32 cl32_fhkeylen; |
1979 | u8 cl32_fhkey[NFSCLNT_KEYMAX]; |
1980 | }; |
1981 | |
1982 | struct compat_nfsctl_export { |
1983 | char ex32_client[NFSCLNT_IDMAX+1]; |
1984 | char ex32_path[NFS_MAXPATHLEN+1]; |
1985 | compat_dev_t ex32_dev; |
1986 | compat_ino_t ex32_ino; |
1987 | compat_int_t ex32_flags; |
1988 | __compat_uid_t ex32_anon_uid; |
1989 | __compat_gid_t ex32_anon_gid; |
1990 | }; |
1991 | |
1992 | struct compat_nfsctl_fdparm { |
1993 | struct sockaddr gd32_addr; |
1994 | s8 gd32_path[NFS_MAXPATHLEN+1]; |
1995 | compat_int_t gd32_version; |
1996 | }; |
1997 | |
1998 | struct compat_nfsctl_fsparm { |
1999 | struct sockaddr gd32_addr; |
2000 | s8 gd32_path[NFS_MAXPATHLEN+1]; |
2001 | compat_int_t gd32_maxlen; |
2002 | }; |
2003 | |
2004 | struct compat_nfsctl_arg { |
2005 | compat_int_t ca32_version; /* safeguard */ |
2006 | union { |
2007 | struct compat_nfsctl_svc u32_svc; |
2008 | struct compat_nfsctl_client u32_client; |
2009 | struct compat_nfsctl_export u32_export; |
2010 | struct compat_nfsctl_fdparm u32_getfd; |
2011 | struct compat_nfsctl_fsparm u32_getfs; |
2012 | } u; |
2013 | #define ca32_svc u.u32_svc |
2014 | #define ca32_client u.u32_client |
2015 | #define ca32_export u.u32_export |
2016 | #define ca32_getfd u.u32_getfd |
2017 | #define ca32_getfs u.u32_getfs |
2018 | }; |
2019 | |
2020 | union compat_nfsctl_res { |
2021 | __u8 cr32_getfh[NFS_FHSIZE]; |
2022 | struct knfsd_fh cr32_getfs; |
2023 | }; |
2024 | |
2025 | static int compat_nfs_svc_trans(struct nfsctl_arg *karg, |
2026 | struct compat_nfsctl_arg __user *arg) |
2027 | { |
2028 | if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) || |
2029 | get_user(karg->ca_version, &arg->ca32_version) || |
2030 | __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) || |
2031 | __get_user(karg->ca_svc.svc_nthreads, |
2032 | &arg->ca32_svc.svc32_nthreads)) |
2033 | return -EFAULT; |
2034 | return 0; |
2035 | } |
2036 | |
2037 | static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, |
2038 | struct compat_nfsctl_arg __user *arg) |
2039 | { |
2040 | if (!access_ok(VERIFY_READ, &arg->ca32_client, |
2041 | sizeof(arg->ca32_client)) || |
2042 | get_user(karg->ca_version, &arg->ca32_version) || |
2043 | __copy_from_user(&karg->ca_client.cl_ident[0], |
2044 | &arg->ca32_client.cl32_ident[0], |
2045 | NFSCLNT_IDMAX) || |
2046 | __get_user(karg->ca_client.cl_naddr, |
2047 | &arg->ca32_client.cl32_naddr) || |
2048 | __copy_from_user(&karg->ca_client.cl_addrlist[0], |
2049 | &arg->ca32_client.cl32_addrlist[0], |
2050 | (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) || |
2051 | __get_user(karg->ca_client.cl_fhkeytype, |
2052 | &arg->ca32_client.cl32_fhkeytype) || |
2053 | __get_user(karg->ca_client.cl_fhkeylen, |
2054 | &arg->ca32_client.cl32_fhkeylen) || |
2055 | __copy_from_user(&karg->ca_client.cl_fhkey[0], |
2056 | &arg->ca32_client.cl32_fhkey[0], |
2057 | NFSCLNT_KEYMAX)) |
2058 | return -EFAULT; |
2059 | |
2060 | return 0; |
2061 | } |
2062 | |
2063 | static int compat_nfs_exp_trans(struct nfsctl_arg *karg, |
2064 | struct compat_nfsctl_arg __user *arg) |
2065 | { |
2066 | if (!access_ok(VERIFY_READ, &arg->ca32_export, |
2067 | sizeof(arg->ca32_export)) || |
2068 | get_user(karg->ca_version, &arg->ca32_version) || |
2069 | __copy_from_user(&karg->ca_export.ex_client[0], |
2070 | &arg->ca32_export.ex32_client[0], |
2071 | NFSCLNT_IDMAX) || |
2072 | __copy_from_user(&karg->ca_export.ex_path[0], |
2073 | &arg->ca32_export.ex32_path[0], |
2074 | NFS_MAXPATHLEN) || |
2075 | __get_user(karg->ca_export.ex_dev, |
2076 | &arg->ca32_export.ex32_dev) || |
2077 | __get_user(karg->ca_export.ex_ino, |
2078 | &arg->ca32_export.ex32_ino) || |
2079 | __get_user(karg->ca_export.ex_flags, |
2080 | &arg->ca32_export.ex32_flags) || |
2081 | __get_user(karg->ca_export.ex_anon_uid, |
2082 | &arg->ca32_export.ex32_anon_uid) || |
2083 | __get_user(karg->ca_export.ex_anon_gid, |
2084 | &arg->ca32_export.ex32_anon_gid)) |
2085 | return -EFAULT; |
2086 | SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid); |
2087 | SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid); |
2088 | |
2089 | return 0; |
2090 | } |
2091 | |
2092 | static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, |
2093 | struct compat_nfsctl_arg __user *arg) |
2094 | { |
2095 | if (!access_ok(VERIFY_READ, &arg->ca32_getfd, |
2096 | sizeof(arg->ca32_getfd)) || |
2097 | get_user(karg->ca_version, &arg->ca32_version) || |
2098 | __copy_from_user(&karg->ca_getfd.gd_addr, |
2099 | &arg->ca32_getfd.gd32_addr, |
2100 | (sizeof(struct sockaddr))) || |
2101 | __copy_from_user(&karg->ca_getfd.gd_path, |
2102 | &arg->ca32_getfd.gd32_path, |
2103 | (NFS_MAXPATHLEN+1)) || |
2104 | __get_user(karg->ca_getfd.gd_version, |
2105 | &arg->ca32_getfd.gd32_version)) |
2106 | return -EFAULT; |
2107 | |
2108 | return 0; |
2109 | } |
2110 | |
2111 | static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, |
2112 | struct compat_nfsctl_arg __user *arg) |
2113 | { |
2114 | if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) || |
2115 | get_user(karg->ca_version, &arg->ca32_version) || |
2116 | __copy_from_user(&karg->ca_getfs.gd_addr, |
2117 | &arg->ca32_getfs.gd32_addr, |
2118 | (sizeof(struct sockaddr))) || |
2119 | __copy_from_user(&karg->ca_getfs.gd_path, |
2120 | &arg->ca32_getfs.gd32_path, |
2121 | (NFS_MAXPATHLEN+1)) || |
2122 | __get_user(karg->ca_getfs.gd_maxlen, |
2123 | &arg->ca32_getfs.gd32_maxlen)) |
2124 | return -EFAULT; |
2125 | |
2126 | return 0; |
2127 | } |
2128 | |
2129 | /* This really doesn't need translations, we are only passing |
2130 | * back a union which contains opaque nfs file handle data. |
2131 | */ |
2132 | static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, |
2133 | union compat_nfsctl_res __user *res) |
2134 | { |
2135 | int err; |
2136 | |
2137 | err = copy_to_user(res, kres, sizeof(*res)); |
2138 | |
2139 | return (err) ? -EFAULT : 0; |
2140 | } |
2141 | |
2142 | asmlinkage long compat_sys_nfsservctl(int cmd, |
2143 | struct compat_nfsctl_arg __user *arg, |
2144 | union compat_nfsctl_res __user *res) |
2145 | { |
2146 | struct nfsctl_arg *karg; |
2147 | union nfsctl_res *kres; |
2148 | mm_segment_t oldfs; |
2149 | int err; |
2150 | |
2151 | karg = kmalloc(sizeof(*karg), GFP_USER); |
2152 | kres = kmalloc(sizeof(*kres), GFP_USER); |
2153 | if(!karg || !kres) { |
2154 | err = -ENOMEM; |
2155 | goto done; |
2156 | } |
2157 | |
2158 | switch(cmd) { |
2159 | case NFSCTL_SVC: |
2160 | err = compat_nfs_svc_trans(karg, arg); |
2161 | break; |
2162 | |
2163 | case NFSCTL_ADDCLIENT: |
2164 | err = compat_nfs_clnt_trans(karg, arg); |
2165 | break; |
2166 | |
2167 | case NFSCTL_DELCLIENT: |
2168 | err = compat_nfs_clnt_trans(karg, arg); |
2169 | break; |
2170 | |
2171 | case NFSCTL_EXPORT: |
2172 | case NFSCTL_UNEXPORT: |
2173 | err = compat_nfs_exp_trans(karg, arg); |
2174 | break; |
2175 | |
2176 | case NFSCTL_GETFD: |
2177 | err = compat_nfs_getfd_trans(karg, arg); |
2178 | break; |
2179 | |
2180 | case NFSCTL_GETFS: |
2181 | err = compat_nfs_getfs_trans(karg, arg); |
2182 | break; |
2183 | |
2184 | default: |
2185 | err = -EINVAL; |
2186 | break; |
2187 | } |
2188 | |
2189 | if (err) |
2190 | goto done; |
2191 | |
2192 | oldfs = get_fs(); |
2193 | set_fs(KERNEL_DS); |
2194 | /* The __user pointer casts are valid because of the set_fs() */ |
2195 | err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres); |
2196 | set_fs(oldfs); |
2197 | |
2198 | if (err) |
2199 | goto done; |
2200 | |
2201 | if((cmd == NFSCTL_GETFD) || |
2202 | (cmd == NFSCTL_GETFS)) |
2203 | err = compat_nfs_getfh_res_trans(kres, res); |
2204 | |
2205 | done: |
2206 | kfree(karg); |
2207 | kfree(kres); |
2208 | return err; |
2209 | } |
2210 | #else /* !NFSD */ |
2211 | long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2) |
2212 | { |
2213 | return sys_ni_syscall(); |
2214 | } |
2215 | #endif |
2216 | |
2217 | #ifdef CONFIG_EPOLL |
2218 | |
2219 | #ifdef HAVE_SET_RESTORE_SIGMASK |
2220 | asmlinkage long compat_sys_epoll_pwait(int epfd, |
2221 | struct compat_epoll_event __user *events, |
2222 | int maxevents, int timeout, |
2223 | const compat_sigset_t __user *sigmask, |
2224 | compat_size_t sigsetsize) |
2225 | { |
2226 | long err; |
2227 | compat_sigset_t csigmask; |
2228 | sigset_t ksigmask, sigsaved; |
2229 | |
2230 | /* |
2231 | * If the caller wants a certain signal mask to be set during the wait, |
2232 | * we apply it here. |
2233 | */ |
2234 | if (sigmask) { |
2235 | if (sigsetsize != sizeof(compat_sigset_t)) |
2236 | return -EINVAL; |
2237 | if (copy_from_user(&csigmask, sigmask, sizeof(csigmask))) |
2238 | return -EFAULT; |
2239 | sigset_from_compat(&ksigmask, &csigmask); |
2240 | sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP)); |
2241 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
2242 | } |
2243 | |
2244 | err = sys_epoll_wait(epfd, events, maxevents, timeout); |
2245 | |
2246 | /* |
2247 | * If we changed the signal mask, we need to restore the original one. |
2248 | * In case we've got a signal while waiting, we do not restore the |
2249 | * signal mask yet, and we allow do_signal() to deliver the signal on |
2250 | * the way back to userspace, before the signal mask is restored. |
2251 | */ |
2252 | if (sigmask) { |
2253 | if (err == -EINTR) { |
2254 | memcpy(¤t->saved_sigmask, &sigsaved, |
2255 | sizeof(sigsaved)); |
2256 | set_restore_sigmask(); |
2257 | } else |
2258 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
2259 | } |
2260 | |
2261 | return err; |
2262 | } |
2263 | #endif /* HAVE_SET_RESTORE_SIGMASK */ |
2264 | |
2265 | #endif /* CONFIG_EPOLL */ |
2266 | |
2267 | #ifdef CONFIG_SIGNALFD |
2268 | |
2269 | asmlinkage long compat_sys_signalfd4(int ufd, |
2270 | const compat_sigset_t __user *sigmask, |
2271 | compat_size_t sigsetsize, int flags) |
2272 | { |
2273 | compat_sigset_t ss32; |
2274 | sigset_t tmp; |
2275 | sigset_t __user *ksigmask; |
2276 | |
2277 | if (sigsetsize != sizeof(compat_sigset_t)) |
2278 | return -EINVAL; |
2279 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
2280 | return -EFAULT; |
2281 | sigset_from_compat(&tmp, &ss32); |
2282 | ksigmask = compat_alloc_user_space(sizeof(sigset_t)); |
2283 | if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t))) |
2284 | return -EFAULT; |
2285 | |
2286 | return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags); |
2287 | } |
2288 | |
2289 | asmlinkage long compat_sys_signalfd(int ufd, |
2290 | const compat_sigset_t __user *sigmask, |
2291 | compat_size_t sigsetsize) |
2292 | { |
2293 | return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0); |
2294 | } |
2295 | #endif /* CONFIG_SIGNALFD */ |
2296 | |
2297 | #ifdef CONFIG_TIMERFD |
2298 | |
2299 | asmlinkage long compat_sys_timerfd_settime(int ufd, int flags, |
2300 | const struct compat_itimerspec __user *utmr, |
2301 | struct compat_itimerspec __user *otmr) |
2302 | { |
2303 | int error; |
2304 | struct itimerspec t; |
2305 | struct itimerspec __user *ut; |
2306 | |
2307 | if (get_compat_itimerspec(&t, utmr)) |
2308 | return -EFAULT; |
2309 | ut = compat_alloc_user_space(2 * sizeof(struct itimerspec)); |
2310 | if (copy_to_user(&ut[0], &t, sizeof(t))) |
2311 | return -EFAULT; |
2312 | error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]); |
2313 | if (!error && otmr) |
2314 | error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) || |
2315 | put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
2316 | |
2317 | return error; |
2318 | } |
2319 | |
2320 | asmlinkage long compat_sys_timerfd_gettime(int ufd, |
2321 | struct compat_itimerspec __user *otmr) |
2322 | { |
2323 | int error; |
2324 | struct itimerspec t; |
2325 | struct itimerspec __user *ut; |
2326 | |
2327 | ut = compat_alloc_user_space(sizeof(struct itimerspec)); |
2328 | error = sys_timerfd_gettime(ufd, ut); |
2329 | if (!error) |
2330 | error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) || |
2331 | put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
2332 | |
2333 | return error; |
2334 | } |
2335 | |
2336 | #endif /* CONFIG_TIMERFD */ |
2337 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9