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