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