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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/dirent.h> |
37 | #include <linux/fsnotify.h> |
38 | #include <linux/highuid.h> |
39 | #include <linux/personality.h> |
40 | #include <linux/rwsem.h> |
41 | #include <linux/tsacct_kern.h> |
42 | #include <linux/security.h> |
43 | #include <linux/highmem.h> |
44 | #include <linux/signal.h> |
45 | #include <linux/poll.h> |
46 | #include <linux/mm.h> |
47 | #include <linux/eventpoll.h> |
48 | #include <linux/fs_struct.h> |
49 | #include <linux/slab.h> |
50 | #include <linux/pagemap.h> |
51 | |
52 | #include <asm/uaccess.h> |
53 | #include <asm/mmu_context.h> |
54 | #include <asm/ioctls.h> |
55 | #include "internal.h" |
56 | |
57 | int compat_log = 1; |
58 | |
59 | int compat_printk(const char *fmt, ...) |
60 | { |
61 | va_list ap; |
62 | int ret; |
63 | if (!compat_log) |
64 | return 0; |
65 | va_start(ap, fmt); |
66 | ret = vprintk(fmt, ap); |
67 | va_end(ap); |
68 | return ret; |
69 | } |
70 | |
71 | #include "read_write.h" |
72 | |
73 | /* |
74 | * Not all architectures have sys_utime, so implement this in terms |
75 | * of sys_utimes. |
76 | */ |
77 | asmlinkage long compat_sys_utime(const char __user *filename, |
78 | struct compat_utimbuf __user *t) |
79 | { |
80 | struct timespec tv[2]; |
81 | |
82 | if (t) { |
83 | if (get_user(tv[0].tv_sec, &t->actime) || |
84 | get_user(tv[1].tv_sec, &t->modtime)) |
85 | return -EFAULT; |
86 | tv[0].tv_nsec = 0; |
87 | tv[1].tv_nsec = 0; |
88 | } |
89 | return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); |
90 | } |
91 | |
92 | asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags) |
93 | { |
94 | struct timespec tv[2]; |
95 | |
96 | if (t) { |
97 | if (get_compat_timespec(&tv[0], &t[0]) || |
98 | get_compat_timespec(&tv[1], &t[1])) |
99 | return -EFAULT; |
100 | |
101 | if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) |
102 | return 0; |
103 | } |
104 | return do_utimes(dfd, filename, t ? tv : NULL, flags); |
105 | } |
106 | |
107 | asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t) |
108 | { |
109 | struct timespec tv[2]; |
110 | |
111 | if (t) { |
112 | if (get_user(tv[0].tv_sec, &t[0].tv_sec) || |
113 | get_user(tv[0].tv_nsec, &t[0].tv_usec) || |
114 | get_user(tv[1].tv_sec, &t[1].tv_sec) || |
115 | get_user(tv[1].tv_nsec, &t[1].tv_usec)) |
116 | return -EFAULT; |
117 | if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || |
118 | tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) |
119 | return -EINVAL; |
120 | tv[0].tv_nsec *= 1000; |
121 | tv[1].tv_nsec *= 1000; |
122 | } |
123 | return do_utimes(dfd, filename, t ? tv : NULL, 0); |
124 | } |
125 | |
126 | asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t) |
127 | { |
128 | return compat_sys_futimesat(AT_FDCWD, filename, t); |
129 | } |
130 | |
131 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) |
132 | { |
133 | struct compat_stat tmp; |
134 | |
135 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) |
136 | return -EOVERFLOW; |
137 | |
138 | memset(&tmp, 0, sizeof(tmp)); |
139 | tmp.st_dev = old_encode_dev(stat->dev); |
140 | tmp.st_ino = stat->ino; |
141 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
142 | return -EOVERFLOW; |
143 | tmp.st_mode = stat->mode; |
144 | tmp.st_nlink = stat->nlink; |
145 | if (tmp.st_nlink != stat->nlink) |
146 | return -EOVERFLOW; |
147 | SET_UID(tmp.st_uid, stat->uid); |
148 | SET_GID(tmp.st_gid, stat->gid); |
149 | tmp.st_rdev = old_encode_dev(stat->rdev); |
150 | if ((u64) stat->size > MAX_NON_LFS) |
151 | return -EOVERFLOW; |
152 | tmp.st_size = stat->size; |
153 | tmp.st_atime = stat->atime.tv_sec; |
154 | tmp.st_atime_nsec = stat->atime.tv_nsec; |
155 | tmp.st_mtime = stat->mtime.tv_sec; |
156 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; |
157 | tmp.st_ctime = stat->ctime.tv_sec; |
158 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; |
159 | tmp.st_blocks = stat->blocks; |
160 | tmp.st_blksize = stat->blksize; |
161 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
162 | } |
163 | |
164 | asmlinkage long compat_sys_newstat(const char __user * filename, |
165 | struct compat_stat __user *statbuf) |
166 | { |
167 | struct kstat stat; |
168 | int error; |
169 | |
170 | error = vfs_stat(filename, &stat); |
171 | if (error) |
172 | return error; |
173 | return cp_compat_stat(&stat, statbuf); |
174 | } |
175 | |
176 | asmlinkage long compat_sys_newlstat(const char __user * filename, |
177 | struct compat_stat __user *statbuf) |
178 | { |
179 | struct kstat stat; |
180 | int error; |
181 | |
182 | error = vfs_lstat(filename, &stat); |
183 | if (error) |
184 | return error; |
185 | return cp_compat_stat(&stat, statbuf); |
186 | } |
187 | |
188 | #ifndef __ARCH_WANT_STAT64 |
189 | asmlinkage long compat_sys_newfstatat(unsigned int dfd, |
190 | const char __user *filename, |
191 | struct compat_stat __user *statbuf, int flag) |
192 | { |
193 | struct kstat stat; |
194 | int error; |
195 | |
196 | error = vfs_fstatat(dfd, filename, &stat, flag); |
197 | if (error) |
198 | return error; |
199 | return cp_compat_stat(&stat, statbuf); |
200 | } |
201 | #endif |
202 | |
203 | asmlinkage long compat_sys_newfstat(unsigned int fd, |
204 | struct compat_stat __user * statbuf) |
205 | { |
206 | struct kstat stat; |
207 | int error = vfs_fstat(fd, &stat); |
208 | |
209 | if (!error) |
210 | error = cp_compat_stat(&stat, statbuf); |
211 | return error; |
212 | } |
213 | |
214 | static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) |
215 | { |
216 | |
217 | if (sizeof ubuf->f_blocks == 4) { |
218 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
219 | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
220 | return -EOVERFLOW; |
221 | /* f_files and f_ffree may be -1; it's okay |
222 | * to stuff that into 32 bits */ |
223 | if (kbuf->f_files != 0xffffffffffffffffULL |
224 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
225 | return -EOVERFLOW; |
226 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
227 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
228 | return -EOVERFLOW; |
229 | } |
230 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
231 | __put_user(kbuf->f_type, &ubuf->f_type) || |
232 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
233 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
234 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
235 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
236 | __put_user(kbuf->f_files, &ubuf->f_files) || |
237 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
238 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
239 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
240 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
241 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
242 | __put_user(kbuf->f_flags, &ubuf->f_flags) || |
243 | __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) |
244 | return -EFAULT; |
245 | return 0; |
246 | } |
247 | |
248 | /* |
249 | * The following statfs calls are copies of code from fs/statfs.c and |
250 | * should be checked against those from time to time |
251 | */ |
252 | asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf) |
253 | { |
254 | struct kstatfs tmp; |
255 | int error = user_statfs(pathname, &tmp); |
256 | if (!error) |
257 | error = put_compat_statfs(buf, &tmp); |
258 | return error; |
259 | } |
260 | |
261 | asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf) |
262 | { |
263 | struct kstatfs tmp; |
264 | int error = fd_statfs(fd, &tmp); |
265 | if (!error) |
266 | error = put_compat_statfs(buf, &tmp); |
267 | return error; |
268 | } |
269 | |
270 | static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) |
271 | { |
272 | if (sizeof ubuf->f_blocks == 4) { |
273 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
274 | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
275 | return -EOVERFLOW; |
276 | /* f_files and f_ffree may be -1; it's okay |
277 | * to stuff that into 32 bits */ |
278 | if (kbuf->f_files != 0xffffffffffffffffULL |
279 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
280 | return -EOVERFLOW; |
281 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
282 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
283 | return -EOVERFLOW; |
284 | } |
285 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
286 | __put_user(kbuf->f_type, &ubuf->f_type) || |
287 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
288 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
289 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
290 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
291 | __put_user(kbuf->f_files, &ubuf->f_files) || |
292 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
293 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
294 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
295 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
296 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
297 | __put_user(kbuf->f_flags, &ubuf->f_flags) || |
298 | __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) |
299 | return -EFAULT; |
300 | return 0; |
301 | } |
302 | |
303 | asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf) |
304 | { |
305 | struct kstatfs tmp; |
306 | int error; |
307 | |
308 | if (sz != sizeof(*buf)) |
309 | return -EINVAL; |
310 | |
311 | error = user_statfs(pathname, &tmp); |
312 | if (!error) |
313 | error = put_compat_statfs64(buf, &tmp); |
314 | return error; |
315 | } |
316 | |
317 | asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf) |
318 | { |
319 | struct kstatfs tmp; |
320 | int error; |
321 | |
322 | if (sz != sizeof(*buf)) |
323 | return -EINVAL; |
324 | |
325 | error = fd_statfs(fd, &tmp); |
326 | if (!error) |
327 | error = put_compat_statfs64(buf, &tmp); |
328 | return error; |
329 | } |
330 | |
331 | /* |
332 | * This is a copy of sys_ustat, just dealing with a structure layout. |
333 | * Given how simple this syscall is that apporach is more maintainable |
334 | * than the various conversion hacks. |
335 | */ |
336 | asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u) |
337 | { |
338 | struct compat_ustat tmp; |
339 | struct kstatfs sbuf; |
340 | int err = vfs_ustat(new_decode_dev(dev), &sbuf); |
341 | if (err) |
342 | return err; |
343 | |
344 | memset(&tmp, 0, sizeof(struct compat_ustat)); |
345 | tmp.f_tfree = sbuf.f_bfree; |
346 | tmp.f_tinode = sbuf.f_ffree; |
347 | if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) |
348 | return -EFAULT; |
349 | return 0; |
350 | } |
351 | |
352 | static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
353 | { |
354 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
355 | __get_user(kfl->l_type, &ufl->l_type) || |
356 | __get_user(kfl->l_whence, &ufl->l_whence) || |
357 | __get_user(kfl->l_start, &ufl->l_start) || |
358 | __get_user(kfl->l_len, &ufl->l_len) || |
359 | __get_user(kfl->l_pid, &ufl->l_pid)) |
360 | return -EFAULT; |
361 | return 0; |
362 | } |
363 | |
364 | static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
365 | { |
366 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
367 | __put_user(kfl->l_type, &ufl->l_type) || |
368 | __put_user(kfl->l_whence, &ufl->l_whence) || |
369 | __put_user(kfl->l_start, &ufl->l_start) || |
370 | __put_user(kfl->l_len, &ufl->l_len) || |
371 | __put_user(kfl->l_pid, &ufl->l_pid)) |
372 | return -EFAULT; |
373 | return 0; |
374 | } |
375 | |
376 | #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 |
377 | static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
378 | { |
379 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
380 | __get_user(kfl->l_type, &ufl->l_type) || |
381 | __get_user(kfl->l_whence, &ufl->l_whence) || |
382 | __get_user(kfl->l_start, &ufl->l_start) || |
383 | __get_user(kfl->l_len, &ufl->l_len) || |
384 | __get_user(kfl->l_pid, &ufl->l_pid)) |
385 | return -EFAULT; |
386 | return 0; |
387 | } |
388 | #endif |
389 | |
390 | #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 |
391 | static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
392 | { |
393 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
394 | __put_user(kfl->l_type, &ufl->l_type) || |
395 | __put_user(kfl->l_whence, &ufl->l_whence) || |
396 | __put_user(kfl->l_start, &ufl->l_start) || |
397 | __put_user(kfl->l_len, &ufl->l_len) || |
398 | __put_user(kfl->l_pid, &ufl->l_pid)) |
399 | return -EFAULT; |
400 | return 0; |
401 | } |
402 | #endif |
403 | |
404 | asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, |
405 | unsigned long arg) |
406 | { |
407 | mm_segment_t old_fs; |
408 | struct flock f; |
409 | long ret; |
410 | |
411 | switch (cmd) { |
412 | case F_GETLK: |
413 | case F_SETLK: |
414 | case F_SETLKW: |
415 | ret = get_compat_flock(&f, compat_ptr(arg)); |
416 | if (ret != 0) |
417 | break; |
418 | old_fs = get_fs(); |
419 | set_fs(KERNEL_DS); |
420 | ret = sys_fcntl(fd, cmd, (unsigned long)&f); |
421 | set_fs(old_fs); |
422 | if (cmd == F_GETLK && ret == 0) { |
423 | /* GETLK was successful and we need to return the data... |
424 | * but it needs to fit in the compat structure. |
425 | * l_start shouldn't be too big, unless the original |
426 | * start + end is greater than COMPAT_OFF_T_MAX, in which |
427 | * case the app was asking for trouble, so we return |
428 | * -EOVERFLOW in that case. |
429 | * l_len could be too big, in which case we just truncate it, |
430 | * and only allow the app to see that part of the conflicting |
431 | * lock that might make sense to it anyway |
432 | */ |
433 | |
434 | if (f.l_start > COMPAT_OFF_T_MAX) |
435 | ret = -EOVERFLOW; |
436 | if (f.l_len > COMPAT_OFF_T_MAX) |
437 | f.l_len = COMPAT_OFF_T_MAX; |
438 | if (ret == 0) |
439 | ret = put_compat_flock(&f, compat_ptr(arg)); |
440 | } |
441 | break; |
442 | |
443 | case F_GETLK64: |
444 | case F_SETLK64: |
445 | case F_SETLKW64: |
446 | ret = get_compat_flock64(&f, compat_ptr(arg)); |
447 | if (ret != 0) |
448 | break; |
449 | old_fs = get_fs(); |
450 | set_fs(KERNEL_DS); |
451 | ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK : |
452 | ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW), |
453 | (unsigned long)&f); |
454 | set_fs(old_fs); |
455 | if (cmd == F_GETLK64 && ret == 0) { |
456 | /* need to return lock information - see above for commentary */ |
457 | if (f.l_start > COMPAT_LOFF_T_MAX) |
458 | ret = -EOVERFLOW; |
459 | if (f.l_len > COMPAT_LOFF_T_MAX) |
460 | f.l_len = COMPAT_LOFF_T_MAX; |
461 | if (ret == 0) |
462 | ret = put_compat_flock64(&f, compat_ptr(arg)); |
463 | } |
464 | break; |
465 | |
466 | default: |
467 | ret = sys_fcntl(fd, cmd, arg); |
468 | break; |
469 | } |
470 | return ret; |
471 | } |
472 | |
473 | asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, |
474 | unsigned long arg) |
475 | { |
476 | if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64)) |
477 | return -EINVAL; |
478 | return compat_sys_fcntl64(fd, cmd, arg); |
479 | } |
480 | |
481 | asmlinkage long |
482 | compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p) |
483 | { |
484 | long ret; |
485 | aio_context_t ctx64; |
486 | |
487 | mm_segment_t oldfs = get_fs(); |
488 | if (unlikely(get_user(ctx64, ctx32p))) |
489 | return -EFAULT; |
490 | |
491 | set_fs(KERNEL_DS); |
492 | /* The __user pointer cast is valid because of the set_fs() */ |
493 | ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64); |
494 | set_fs(oldfs); |
495 | /* truncating is ok because it's a user address */ |
496 | if (!ret) |
497 | ret = put_user((u32) ctx64, ctx32p); |
498 | return ret; |
499 | } |
500 | |
501 | asmlinkage long |
502 | compat_sys_io_getevents(aio_context_t ctx_id, |
503 | unsigned long min_nr, |
504 | unsigned long nr, |
505 | struct io_event __user *events, |
506 | struct compat_timespec __user *timeout) |
507 | { |
508 | long ret; |
509 | struct timespec t; |
510 | struct timespec __user *ut = NULL; |
511 | |
512 | ret = -EFAULT; |
513 | if (unlikely(!access_ok(VERIFY_WRITE, events, |
514 | nr * sizeof(struct io_event)))) |
515 | goto out; |
516 | if (timeout) { |
517 | if (get_compat_timespec(&t, timeout)) |
518 | goto out; |
519 | |
520 | ut = compat_alloc_user_space(sizeof(*ut)); |
521 | if (copy_to_user(ut, &t, sizeof(t)) ) |
522 | goto out; |
523 | } |
524 | ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut); |
525 | out: |
526 | return ret; |
527 | } |
528 | |
529 | /* A write operation does a read from user space and vice versa */ |
530 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
531 | |
532 | ssize_t compat_rw_copy_check_uvector(int type, |
533 | const struct compat_iovec __user *uvector, unsigned long nr_segs, |
534 | unsigned long fast_segs, struct iovec *fast_pointer, |
535 | struct iovec **ret_pointer, int check_access) |
536 | { |
537 | compat_ssize_t tot_len; |
538 | struct iovec *iov = *ret_pointer = fast_pointer; |
539 | ssize_t ret = 0; |
540 | int seg; |
541 | |
542 | /* |
543 | * SuS says "The readv() function *may* fail if the iovcnt argument |
544 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
545 | * traditionally returned zero for zero segments, so... |
546 | */ |
547 | if (nr_segs == 0) |
548 | goto out; |
549 | |
550 | ret = -EINVAL; |
551 | if (nr_segs > UIO_MAXIOV || nr_segs < 0) |
552 | goto out; |
553 | if (nr_segs > fast_segs) { |
554 | ret = -ENOMEM; |
555 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
556 | if (iov == NULL) |
557 | goto out; |
558 | } |
559 | *ret_pointer = iov; |
560 | |
561 | /* |
562 | * Single unix specification: |
563 | * We should -EINVAL if an element length is not >= 0 and fitting an |
564 | * ssize_t. |
565 | * |
566 | * In Linux, the total length is limited to MAX_RW_COUNT, there is |
567 | * no overflow possibility. |
568 | */ |
569 | tot_len = 0; |
570 | ret = -EINVAL; |
571 | for (seg = 0; seg < nr_segs; seg++) { |
572 | compat_uptr_t buf; |
573 | compat_ssize_t len; |
574 | |
575 | if (__get_user(len, &uvector->iov_len) || |
576 | __get_user(buf, &uvector->iov_base)) { |
577 | ret = -EFAULT; |
578 | goto out; |
579 | } |
580 | if (len < 0) /* size_t not fitting in compat_ssize_t .. */ |
581 | goto out; |
582 | if (check_access && |
583 | !access_ok(vrfy_dir(type), compat_ptr(buf), len)) { |
584 | ret = -EFAULT; |
585 | goto out; |
586 | } |
587 | if (len > MAX_RW_COUNT - tot_len) |
588 | len = MAX_RW_COUNT - tot_len; |
589 | tot_len += len; |
590 | iov->iov_base = compat_ptr(buf); |
591 | iov->iov_len = (compat_size_t) len; |
592 | uvector++; |
593 | iov++; |
594 | } |
595 | ret = tot_len; |
596 | |
597 | out: |
598 | return ret; |
599 | } |
600 | |
601 | static inline long |
602 | copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64) |
603 | { |
604 | compat_uptr_t uptr; |
605 | int i; |
606 | |
607 | for (i = 0; i < nr; ++i) { |
608 | if (get_user(uptr, ptr32 + i)) |
609 | return -EFAULT; |
610 | if (put_user(compat_ptr(uptr), ptr64 + i)) |
611 | return -EFAULT; |
612 | } |
613 | return 0; |
614 | } |
615 | |
616 | #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) |
617 | |
618 | asmlinkage long |
619 | compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb) |
620 | { |
621 | struct iocb __user * __user *iocb64; |
622 | long ret; |
623 | |
624 | if (unlikely(nr < 0)) |
625 | return -EINVAL; |
626 | |
627 | if (nr > MAX_AIO_SUBMITS) |
628 | nr = MAX_AIO_SUBMITS; |
629 | |
630 | iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); |
631 | ret = copy_iocb(nr, iocb, iocb64); |
632 | if (!ret) |
633 | ret = do_io_submit(ctx_id, nr, iocb64, 1); |
634 | return ret; |
635 | } |
636 | |
637 | struct compat_ncp_mount_data { |
638 | compat_int_t version; |
639 | compat_uint_t ncp_fd; |
640 | __compat_uid_t mounted_uid; |
641 | compat_pid_t wdog_pid; |
642 | unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; |
643 | compat_uint_t time_out; |
644 | compat_uint_t retry_count; |
645 | compat_uint_t flags; |
646 | __compat_uid_t uid; |
647 | __compat_gid_t gid; |
648 | compat_mode_t file_mode; |
649 | compat_mode_t dir_mode; |
650 | }; |
651 | |
652 | struct compat_ncp_mount_data_v4 { |
653 | compat_int_t version; |
654 | compat_ulong_t flags; |
655 | compat_ulong_t mounted_uid; |
656 | compat_long_t wdog_pid; |
657 | compat_uint_t ncp_fd; |
658 | compat_uint_t time_out; |
659 | compat_uint_t retry_count; |
660 | compat_ulong_t uid; |
661 | compat_ulong_t gid; |
662 | compat_ulong_t file_mode; |
663 | compat_ulong_t dir_mode; |
664 | }; |
665 | |
666 | static void *do_ncp_super_data_conv(void *raw_data) |
667 | { |
668 | int version = *(unsigned int *)raw_data; |
669 | |
670 | if (version == 3) { |
671 | struct compat_ncp_mount_data *c_n = raw_data; |
672 | struct ncp_mount_data *n = raw_data; |
673 | |
674 | n->dir_mode = c_n->dir_mode; |
675 | n->file_mode = c_n->file_mode; |
676 | n->gid = c_n->gid; |
677 | n->uid = c_n->uid; |
678 | memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); |
679 | n->wdog_pid = c_n->wdog_pid; |
680 | n->mounted_uid = c_n->mounted_uid; |
681 | } else if (version == 4) { |
682 | struct compat_ncp_mount_data_v4 *c_n = raw_data; |
683 | struct ncp_mount_data_v4 *n = raw_data; |
684 | |
685 | n->dir_mode = c_n->dir_mode; |
686 | n->file_mode = c_n->file_mode; |
687 | n->gid = c_n->gid; |
688 | n->uid = c_n->uid; |
689 | n->retry_count = c_n->retry_count; |
690 | n->time_out = c_n->time_out; |
691 | n->ncp_fd = c_n->ncp_fd; |
692 | n->wdog_pid = c_n->wdog_pid; |
693 | n->mounted_uid = c_n->mounted_uid; |
694 | n->flags = c_n->flags; |
695 | } else if (version != 5) { |
696 | return NULL; |
697 | } |
698 | |
699 | return raw_data; |
700 | } |
701 | |
702 | |
703 | struct compat_nfs_string { |
704 | compat_uint_t len; |
705 | compat_uptr_t data; |
706 | }; |
707 | |
708 | static inline void compat_nfs_string(struct nfs_string *dst, |
709 | struct compat_nfs_string *src) |
710 | { |
711 | dst->data = compat_ptr(src->data); |
712 | dst->len = src->len; |
713 | } |
714 | |
715 | struct compat_nfs4_mount_data_v1 { |
716 | compat_int_t version; |
717 | compat_int_t flags; |
718 | compat_int_t rsize; |
719 | compat_int_t wsize; |
720 | compat_int_t timeo; |
721 | compat_int_t retrans; |
722 | compat_int_t acregmin; |
723 | compat_int_t acregmax; |
724 | compat_int_t acdirmin; |
725 | compat_int_t acdirmax; |
726 | struct compat_nfs_string client_addr; |
727 | struct compat_nfs_string mnt_path; |
728 | struct compat_nfs_string hostname; |
729 | compat_uint_t host_addrlen; |
730 | compat_uptr_t host_addr; |
731 | compat_int_t proto; |
732 | compat_int_t auth_flavourlen; |
733 | compat_uptr_t auth_flavours; |
734 | }; |
735 | |
736 | static int do_nfs4_super_data_conv(void *raw_data) |
737 | { |
738 | int version = *(compat_uint_t *) raw_data; |
739 | |
740 | if (version == 1) { |
741 | struct compat_nfs4_mount_data_v1 *raw = raw_data; |
742 | struct nfs4_mount_data *real = raw_data; |
743 | |
744 | /* copy the fields backwards */ |
745 | real->auth_flavours = compat_ptr(raw->auth_flavours); |
746 | real->auth_flavourlen = raw->auth_flavourlen; |
747 | real->proto = raw->proto; |
748 | real->host_addr = compat_ptr(raw->host_addr); |
749 | real->host_addrlen = raw->host_addrlen; |
750 | compat_nfs_string(&real->hostname, &raw->hostname); |
751 | compat_nfs_string(&real->mnt_path, &raw->mnt_path); |
752 | compat_nfs_string(&real->client_addr, &raw->client_addr); |
753 | real->acdirmax = raw->acdirmax; |
754 | real->acdirmin = raw->acdirmin; |
755 | real->acregmax = raw->acregmax; |
756 | real->acregmin = raw->acregmin; |
757 | real->retrans = raw->retrans; |
758 | real->timeo = raw->timeo; |
759 | real->wsize = raw->wsize; |
760 | real->rsize = raw->rsize; |
761 | real->flags = raw->flags; |
762 | real->version = raw->version; |
763 | } |
764 | |
765 | return 0; |
766 | } |
767 | |
768 | #define NCPFS_NAME "ncpfs" |
769 | #define NFS4_NAME "nfs4" |
770 | |
771 | asmlinkage long compat_sys_mount(const char __user * dev_name, |
772 | const char __user * dir_name, |
773 | const char __user * type, unsigned long flags, |
774 | const void __user * data) |
775 | { |
776 | char *kernel_type; |
777 | unsigned long data_page; |
778 | char *kernel_dev; |
779 | char *dir_page; |
780 | int retval; |
781 | |
782 | retval = copy_mount_string(type, &kernel_type); |
783 | if (retval < 0) |
784 | goto out; |
785 | |
786 | dir_page = getname(dir_name); |
787 | retval = PTR_ERR(dir_page); |
788 | if (IS_ERR(dir_page)) |
789 | goto out1; |
790 | |
791 | retval = copy_mount_string(dev_name, &kernel_dev); |
792 | if (retval < 0) |
793 | goto out2; |
794 | |
795 | retval = copy_mount_options(data, &data_page); |
796 | if (retval < 0) |
797 | goto out3; |
798 | |
799 | retval = -EINVAL; |
800 | |
801 | if (kernel_type && data_page) { |
802 | if (!strcmp(kernel_type, NCPFS_NAME)) { |
803 | do_ncp_super_data_conv((void *)data_page); |
804 | } else if (!strcmp(kernel_type, NFS4_NAME)) { |
805 | if (do_nfs4_super_data_conv((void *) data_page)) |
806 | goto out4; |
807 | } |
808 | } |
809 | |
810 | retval = do_mount(kernel_dev, dir_page, kernel_type, |
811 | flags, (void*)data_page); |
812 | |
813 | out4: |
814 | free_page(data_page); |
815 | out3: |
816 | kfree(kernel_dev); |
817 | out2: |
818 | putname(dir_page); |
819 | out1: |
820 | kfree(kernel_type); |
821 | out: |
822 | return retval; |
823 | } |
824 | |
825 | struct compat_old_linux_dirent { |
826 | compat_ulong_t d_ino; |
827 | compat_ulong_t d_offset; |
828 | unsigned short d_namlen; |
829 | char d_name[1]; |
830 | }; |
831 | |
832 | struct compat_readdir_callback { |
833 | struct compat_old_linux_dirent __user *dirent; |
834 | int result; |
835 | }; |
836 | |
837 | static int compat_fillonedir(void *__buf, const char *name, int namlen, |
838 | loff_t offset, u64 ino, unsigned int d_type) |
839 | { |
840 | struct compat_readdir_callback *buf = __buf; |
841 | struct compat_old_linux_dirent __user *dirent; |
842 | compat_ulong_t d_ino; |
843 | |
844 | if (buf->result) |
845 | return -EINVAL; |
846 | d_ino = ino; |
847 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
848 | buf->result = -EOVERFLOW; |
849 | return -EOVERFLOW; |
850 | } |
851 | buf->result++; |
852 | dirent = buf->dirent; |
853 | if (!access_ok(VERIFY_WRITE, dirent, |
854 | (unsigned long)(dirent->d_name + namlen + 1) - |
855 | (unsigned long)dirent)) |
856 | goto efault; |
857 | if ( __put_user(d_ino, &dirent->d_ino) || |
858 | __put_user(offset, &dirent->d_offset) || |
859 | __put_user(namlen, &dirent->d_namlen) || |
860 | __copy_to_user(dirent->d_name, name, namlen) || |
861 | __put_user(0, dirent->d_name + namlen)) |
862 | goto efault; |
863 | return 0; |
864 | efault: |
865 | buf->result = -EFAULT; |
866 | return -EFAULT; |
867 | } |
868 | |
869 | asmlinkage long compat_sys_old_readdir(unsigned int fd, |
870 | struct compat_old_linux_dirent __user *dirent, unsigned int count) |
871 | { |
872 | int error; |
873 | struct file *file; |
874 | struct compat_readdir_callback buf; |
875 | |
876 | error = -EBADF; |
877 | file = fget(fd); |
878 | if (!file) |
879 | goto out; |
880 | |
881 | buf.result = 0; |
882 | buf.dirent = dirent; |
883 | |
884 | error = vfs_readdir(file, compat_fillonedir, &buf); |
885 | if (buf.result) |
886 | error = buf.result; |
887 | |
888 | fput(file); |
889 | out: |
890 | return error; |
891 | } |
892 | |
893 | struct compat_linux_dirent { |
894 | compat_ulong_t d_ino; |
895 | compat_ulong_t d_off; |
896 | unsigned short d_reclen; |
897 | char d_name[1]; |
898 | }; |
899 | |
900 | struct compat_getdents_callback { |
901 | struct compat_linux_dirent __user *current_dir; |
902 | struct compat_linux_dirent __user *previous; |
903 | int count; |
904 | int error; |
905 | }; |
906 | |
907 | static int compat_filldir(void *__buf, const char *name, int namlen, |
908 | loff_t offset, u64 ino, unsigned int d_type) |
909 | { |
910 | struct compat_linux_dirent __user * dirent; |
911 | struct compat_getdents_callback *buf = __buf; |
912 | compat_ulong_t d_ino; |
913 | int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + |
914 | namlen + 2, sizeof(compat_long_t)); |
915 | |
916 | buf->error = -EINVAL; /* only used if we fail.. */ |
917 | if (reclen > buf->count) |
918 | return -EINVAL; |
919 | d_ino = ino; |
920 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
921 | buf->error = -EOVERFLOW; |
922 | return -EOVERFLOW; |
923 | } |
924 | dirent = buf->previous; |
925 | if (dirent) { |
926 | if (__put_user(offset, &dirent->d_off)) |
927 | goto efault; |
928 | } |
929 | dirent = buf->current_dir; |
930 | if (__put_user(d_ino, &dirent->d_ino)) |
931 | goto efault; |
932 | if (__put_user(reclen, &dirent->d_reclen)) |
933 | goto efault; |
934 | if (copy_to_user(dirent->d_name, name, namlen)) |
935 | goto efault; |
936 | if (__put_user(0, dirent->d_name + namlen)) |
937 | goto efault; |
938 | if (__put_user(d_type, (char __user *) dirent + reclen - 1)) |
939 | goto efault; |
940 | buf->previous = dirent; |
941 | dirent = (void __user *)dirent + reclen; |
942 | buf->current_dir = dirent; |
943 | buf->count -= reclen; |
944 | return 0; |
945 | efault: |
946 | buf->error = -EFAULT; |
947 | return -EFAULT; |
948 | } |
949 | |
950 | asmlinkage long compat_sys_getdents(unsigned int fd, |
951 | struct compat_linux_dirent __user *dirent, unsigned int count) |
952 | { |
953 | struct file * file; |
954 | struct compat_linux_dirent __user * lastdirent; |
955 | struct compat_getdents_callback buf; |
956 | int error; |
957 | |
958 | error = -EFAULT; |
959 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
960 | goto out; |
961 | |
962 | error = -EBADF; |
963 | file = fget(fd); |
964 | if (!file) |
965 | goto out; |
966 | |
967 | buf.current_dir = dirent; |
968 | buf.previous = NULL; |
969 | buf.count = count; |
970 | buf.error = 0; |
971 | |
972 | error = vfs_readdir(file, compat_filldir, &buf); |
973 | if (error >= 0) |
974 | error = buf.error; |
975 | lastdirent = buf.previous; |
976 | if (lastdirent) { |
977 | if (put_user(file->f_pos, &lastdirent->d_off)) |
978 | error = -EFAULT; |
979 | else |
980 | error = count - buf.count; |
981 | } |
982 | fput(file); |
983 | out: |
984 | return error; |
985 | } |
986 | |
987 | #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64 |
988 | |
989 | struct compat_getdents_callback64 { |
990 | struct linux_dirent64 __user *current_dir; |
991 | struct linux_dirent64 __user *previous; |
992 | int count; |
993 | int error; |
994 | }; |
995 | |
996 | static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset, |
997 | u64 ino, unsigned int d_type) |
998 | { |
999 | struct linux_dirent64 __user *dirent; |
1000 | struct compat_getdents_callback64 *buf = __buf; |
1001 | int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, |
1002 | sizeof(u64)); |
1003 | u64 off; |
1004 | |
1005 | buf->error = -EINVAL; /* only used if we fail.. */ |
1006 | if (reclen > buf->count) |
1007 | return -EINVAL; |
1008 | dirent = buf->previous; |
1009 | |
1010 | if (dirent) { |
1011 | if (__put_user_unaligned(offset, &dirent->d_off)) |
1012 | goto efault; |
1013 | } |
1014 | dirent = buf->current_dir; |
1015 | if (__put_user_unaligned(ino, &dirent->d_ino)) |
1016 | goto efault; |
1017 | off = 0; |
1018 | if (__put_user_unaligned(off, &dirent->d_off)) |
1019 | goto efault; |
1020 | if (__put_user(reclen, &dirent->d_reclen)) |
1021 | goto efault; |
1022 | if (__put_user(d_type, &dirent->d_type)) |
1023 | goto efault; |
1024 | if (copy_to_user(dirent->d_name, name, namlen)) |
1025 | goto efault; |
1026 | if (__put_user(0, dirent->d_name + namlen)) |
1027 | goto efault; |
1028 | buf->previous = dirent; |
1029 | dirent = (void __user *)dirent + reclen; |
1030 | buf->current_dir = dirent; |
1031 | buf->count -= reclen; |
1032 | return 0; |
1033 | efault: |
1034 | buf->error = -EFAULT; |
1035 | return -EFAULT; |
1036 | } |
1037 | |
1038 | asmlinkage long compat_sys_getdents64(unsigned int fd, |
1039 | struct linux_dirent64 __user * dirent, unsigned int count) |
1040 | { |
1041 | struct file * file; |
1042 | struct linux_dirent64 __user * lastdirent; |
1043 | struct compat_getdents_callback64 buf; |
1044 | int error; |
1045 | |
1046 | error = -EFAULT; |
1047 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
1048 | goto out; |
1049 | |
1050 | error = -EBADF; |
1051 | file = fget(fd); |
1052 | if (!file) |
1053 | goto out; |
1054 | |
1055 | buf.current_dir = dirent; |
1056 | buf.previous = NULL; |
1057 | buf.count = count; |
1058 | buf.error = 0; |
1059 | |
1060 | error = vfs_readdir(file, compat_filldir64, &buf); |
1061 | if (error >= 0) |
1062 | error = buf.error; |
1063 | lastdirent = buf.previous; |
1064 | if (lastdirent) { |
1065 | typeof(lastdirent->d_off) d_off = file->f_pos; |
1066 | if (__put_user_unaligned(d_off, &lastdirent->d_off)) |
1067 | error = -EFAULT; |
1068 | else |
1069 | error = count - buf.count; |
1070 | } |
1071 | fput(file); |
1072 | out: |
1073 | return error; |
1074 | } |
1075 | #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */ |
1076 | |
1077 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
1078 | const struct compat_iovec __user *uvector, |
1079 | unsigned long nr_segs, loff_t *pos) |
1080 | { |
1081 | compat_ssize_t tot_len; |
1082 | struct iovec iovstack[UIO_FASTIOV]; |
1083 | struct iovec *iov = iovstack; |
1084 | ssize_t ret; |
1085 | io_fn_t fn; |
1086 | iov_fn_t fnv; |
1087 | |
1088 | ret = -EINVAL; |
1089 | if (!file->f_op) |
1090 | goto out; |
1091 | |
1092 | ret = -EFAULT; |
1093 | if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) |
1094 | goto out; |
1095 | |
1096 | tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
1097 | UIO_FASTIOV, iovstack, &iov, 1); |
1098 | if (tot_len == 0) { |
1099 | ret = 0; |
1100 | goto out; |
1101 | } |
1102 | |
1103 | ret = rw_verify_area(type, file, pos, tot_len); |
1104 | if (ret < 0) |
1105 | goto out; |
1106 | |
1107 | fnv = NULL; |
1108 | if (type == READ) { |
1109 | fn = file->f_op->read; |
1110 | fnv = file->f_op->aio_read; |
1111 | } else { |
1112 | fn = (io_fn_t)file->f_op->write; |
1113 | fnv = file->f_op->aio_write; |
1114 | } |
1115 | |
1116 | if (fnv) |
1117 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
1118 | pos, fnv); |
1119 | else |
1120 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
1121 | |
1122 | out: |
1123 | if (iov != iovstack) |
1124 | kfree(iov); |
1125 | if ((ret + (type == READ)) > 0) { |
1126 | if (type == READ) |
1127 | fsnotify_access(file); |
1128 | else |
1129 | fsnotify_modify(file); |
1130 | } |
1131 | return ret; |
1132 | } |
1133 | |
1134 | static size_t compat_readv(struct file *file, |
1135 | const struct compat_iovec __user *vec, |
1136 | unsigned long vlen, loff_t *pos) |
1137 | { |
1138 | ssize_t ret = -EBADF; |
1139 | |
1140 | if (!(file->f_mode & FMODE_READ)) |
1141 | goto out; |
1142 | |
1143 | ret = -EINVAL; |
1144 | if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
1145 | goto out; |
1146 | |
1147 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
1148 | |
1149 | out: |
1150 | if (ret > 0) |
1151 | add_rchar(current, ret); |
1152 | inc_syscr(current); |
1153 | return ret; |
1154 | } |
1155 | |
1156 | asmlinkage ssize_t |
1157 | compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, |
1158 | unsigned long vlen) |
1159 | { |
1160 | struct file *file; |
1161 | int fput_needed; |
1162 | ssize_t ret; |
1163 | |
1164 | file = fget_light(fd, &fput_needed); |
1165 | if (!file) |
1166 | return -EBADF; |
1167 | ret = compat_readv(file, vec, vlen, &file->f_pos); |
1168 | fput_light(file, fput_needed); |
1169 | return ret; |
1170 | } |
1171 | |
1172 | asmlinkage ssize_t |
1173 | compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec, |
1174 | unsigned long vlen, loff_t pos) |
1175 | { |
1176 | struct file *file; |
1177 | int fput_needed; |
1178 | ssize_t ret; |
1179 | |
1180 | if (pos < 0) |
1181 | return -EINVAL; |
1182 | file = fget_light(fd, &fput_needed); |
1183 | if (!file) |
1184 | return -EBADF; |
1185 | ret = -ESPIPE; |
1186 | if (file->f_mode & FMODE_PREAD) |
1187 | ret = compat_readv(file, vec, vlen, &pos); |
1188 | fput_light(file, fput_needed); |
1189 | return ret; |
1190 | } |
1191 | |
1192 | asmlinkage ssize_t |
1193 | compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec, |
1194 | unsigned long vlen, u32 pos_low, u32 pos_high) |
1195 | { |
1196 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1197 | return compat_sys_preadv64(fd, vec, vlen, pos); |
1198 | } |
1199 | |
1200 | static size_t compat_writev(struct file *file, |
1201 | const struct compat_iovec __user *vec, |
1202 | unsigned long vlen, loff_t *pos) |
1203 | { |
1204 | ssize_t ret = -EBADF; |
1205 | |
1206 | if (!(file->f_mode & FMODE_WRITE)) |
1207 | goto out; |
1208 | |
1209 | ret = -EINVAL; |
1210 | if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
1211 | goto out; |
1212 | |
1213 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
1214 | |
1215 | out: |
1216 | if (ret > 0) |
1217 | add_wchar(current, ret); |
1218 | inc_syscw(current); |
1219 | return ret; |
1220 | } |
1221 | |
1222 | asmlinkage ssize_t |
1223 | compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, |
1224 | unsigned long vlen) |
1225 | { |
1226 | struct file *file; |
1227 | int fput_needed; |
1228 | ssize_t ret; |
1229 | |
1230 | file = fget_light(fd, &fput_needed); |
1231 | if (!file) |
1232 | return -EBADF; |
1233 | ret = compat_writev(file, vec, vlen, &file->f_pos); |
1234 | fput_light(file, fput_needed); |
1235 | return ret; |
1236 | } |
1237 | |
1238 | asmlinkage ssize_t |
1239 | compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec, |
1240 | unsigned long vlen, loff_t pos) |
1241 | { |
1242 | struct file *file; |
1243 | int fput_needed; |
1244 | ssize_t ret; |
1245 | |
1246 | if (pos < 0) |
1247 | return -EINVAL; |
1248 | file = fget_light(fd, &fput_needed); |
1249 | if (!file) |
1250 | return -EBADF; |
1251 | ret = -ESPIPE; |
1252 | if (file->f_mode & FMODE_PWRITE) |
1253 | ret = compat_writev(file, vec, vlen, &pos); |
1254 | fput_light(file, fput_needed); |
1255 | return ret; |
1256 | } |
1257 | |
1258 | asmlinkage ssize_t |
1259 | compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec, |
1260 | unsigned long vlen, u32 pos_low, u32 pos_high) |
1261 | { |
1262 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1263 | return compat_sys_pwritev64(fd, vec, vlen, pos); |
1264 | } |
1265 | |
1266 | asmlinkage long |
1267 | compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, |
1268 | unsigned int nr_segs, unsigned int flags) |
1269 | { |
1270 | unsigned i; |
1271 | struct iovec __user *iov; |
1272 | if (nr_segs > UIO_MAXIOV) |
1273 | return -EINVAL; |
1274 | iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); |
1275 | for (i = 0; i < nr_segs; i++) { |
1276 | struct compat_iovec v; |
1277 | if (get_user(v.iov_base, &iov32[i].iov_base) || |
1278 | get_user(v.iov_len, &iov32[i].iov_len) || |
1279 | put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || |
1280 | put_user(v.iov_len, &iov[i].iov_len)) |
1281 | return -EFAULT; |
1282 | } |
1283 | return sys_vmsplice(fd, iov, nr_segs, flags); |
1284 | } |
1285 | |
1286 | /* |
1287 | * Exactly like fs/open.c:sys_open(), except that it doesn't set the |
1288 | * O_LARGEFILE flag. |
1289 | */ |
1290 | asmlinkage long |
1291 | compat_sys_open(const char __user *filename, int flags, umode_t mode) |
1292 | { |
1293 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
1294 | } |
1295 | |
1296 | /* |
1297 | * Exactly like fs/open.c:sys_openat(), except that it doesn't set the |
1298 | * O_LARGEFILE flag. |
1299 | */ |
1300 | asmlinkage long |
1301 | compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode) |
1302 | { |
1303 | return do_sys_open(dfd, filename, flags, mode); |
1304 | } |
1305 | |
1306 | #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
1307 | |
1308 | static int poll_select_copy_remaining(struct timespec *end_time, void __user *p, |
1309 | int timeval, int ret) |
1310 | { |
1311 | struct timespec ts; |
1312 | |
1313 | if (!p) |
1314 | return ret; |
1315 | |
1316 | if (current->personality & STICKY_TIMEOUTS) |
1317 | goto sticky; |
1318 | |
1319 | /* No update for zero timeout */ |
1320 | if (!end_time->tv_sec && !end_time->tv_nsec) |
1321 | return ret; |
1322 | |
1323 | ktime_get_ts(&ts); |
1324 | ts = timespec_sub(*end_time, ts); |
1325 | if (ts.tv_sec < 0) |
1326 | ts.tv_sec = ts.tv_nsec = 0; |
1327 | |
1328 | if (timeval) { |
1329 | struct compat_timeval rtv; |
1330 | |
1331 | rtv.tv_sec = ts.tv_sec; |
1332 | rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; |
1333 | |
1334 | if (!copy_to_user(p, &rtv, sizeof(rtv))) |
1335 | return ret; |
1336 | } else { |
1337 | struct compat_timespec rts; |
1338 | |
1339 | rts.tv_sec = ts.tv_sec; |
1340 | rts.tv_nsec = ts.tv_nsec; |
1341 | |
1342 | if (!copy_to_user(p, &rts, sizeof(rts))) |
1343 | return ret; |
1344 | } |
1345 | /* |
1346 | * If an application puts its timeval in read-only memory, we |
1347 | * don't want the Linux-specific update to the timeval to |
1348 | * cause a fault after the select has completed |
1349 | * successfully. However, because we're not updating the |
1350 | * timeval, we can't restart the system call. |
1351 | */ |
1352 | |
1353 | sticky: |
1354 | if (ret == -ERESTARTNOHAND) |
1355 | ret = -EINTR; |
1356 | return ret; |
1357 | } |
1358 | |
1359 | /* |
1360 | * Ooo, nasty. We need here to frob 32-bit unsigned longs to |
1361 | * 64-bit unsigned longs. |
1362 | */ |
1363 | static |
1364 | int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1365 | unsigned long *fdset) |
1366 | { |
1367 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1368 | if (ufdset) { |
1369 | unsigned long odd; |
1370 | |
1371 | if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) |
1372 | return -EFAULT; |
1373 | |
1374 | odd = nr & 1UL; |
1375 | nr &= ~1UL; |
1376 | while (nr) { |
1377 | unsigned long h, l; |
1378 | if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) |
1379 | return -EFAULT; |
1380 | ufdset += 2; |
1381 | *fdset++ = h << 32 | l; |
1382 | nr -= 2; |
1383 | } |
1384 | if (odd && __get_user(*fdset, ufdset)) |
1385 | return -EFAULT; |
1386 | } else { |
1387 | /* Tricky, must clear full unsigned long in the |
1388 | * kernel fdset at the end, this makes sure that |
1389 | * actually happens. |
1390 | */ |
1391 | memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); |
1392 | } |
1393 | return 0; |
1394 | } |
1395 | |
1396 | static |
1397 | int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1398 | unsigned long *fdset) |
1399 | { |
1400 | unsigned long odd; |
1401 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1402 | |
1403 | if (!ufdset) |
1404 | return 0; |
1405 | |
1406 | odd = nr & 1UL; |
1407 | nr &= ~1UL; |
1408 | while (nr) { |
1409 | unsigned long h, l; |
1410 | l = *fdset++; |
1411 | h = l >> 32; |
1412 | if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) |
1413 | return -EFAULT; |
1414 | ufdset += 2; |
1415 | nr -= 2; |
1416 | } |
1417 | if (odd && __put_user(*fdset, ufdset)) |
1418 | return -EFAULT; |
1419 | return 0; |
1420 | } |
1421 | |
1422 | |
1423 | /* |
1424 | * This is a virtual copy of sys_select from fs/select.c and probably |
1425 | * should be compared to it from time to time |
1426 | */ |
1427 | |
1428 | /* |
1429 | * We can actually return ERESTARTSYS instead of EINTR, but I'd |
1430 | * like to be certain this leads to no problems. So I return |
1431 | * EINTR just for safety. |
1432 | * |
1433 | * Update: ERESTARTSYS breaks at least the xview clock binary, so |
1434 | * I'm trying ERESTARTNOHAND which restart only when you want to. |
1435 | */ |
1436 | int compat_core_sys_select(int n, compat_ulong_t __user *inp, |
1437 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1438 | struct timespec *end_time) |
1439 | { |
1440 | fd_set_bits fds; |
1441 | void *bits; |
1442 | int size, max_fds, ret = -EINVAL; |
1443 | struct fdtable *fdt; |
1444 | long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; |
1445 | |
1446 | if (n < 0) |
1447 | goto out_nofds; |
1448 | |
1449 | /* max_fds can increase, so grab it once to avoid race */ |
1450 | rcu_read_lock(); |
1451 | fdt = files_fdtable(current->files); |
1452 | max_fds = fdt->max_fds; |
1453 | rcu_read_unlock(); |
1454 | if (n > max_fds) |
1455 | n = max_fds; |
1456 | |
1457 | /* |
1458 | * We need 6 bitmaps (in/out/ex for both incoming and outgoing), |
1459 | * since we used fdset we need to allocate memory in units of |
1460 | * long-words. |
1461 | */ |
1462 | size = FDS_BYTES(n); |
1463 | bits = stack_fds; |
1464 | if (size > sizeof(stack_fds) / 6) { |
1465 | bits = kmalloc(6 * size, GFP_KERNEL); |
1466 | ret = -ENOMEM; |
1467 | if (!bits) |
1468 | goto out_nofds; |
1469 | } |
1470 | fds.in = (unsigned long *) bits; |
1471 | fds.out = (unsigned long *) (bits + size); |
1472 | fds.ex = (unsigned long *) (bits + 2*size); |
1473 | fds.res_in = (unsigned long *) (bits + 3*size); |
1474 | fds.res_out = (unsigned long *) (bits + 4*size); |
1475 | fds.res_ex = (unsigned long *) (bits + 5*size); |
1476 | |
1477 | if ((ret = compat_get_fd_set(n, inp, fds.in)) || |
1478 | (ret = compat_get_fd_set(n, outp, fds.out)) || |
1479 | (ret = compat_get_fd_set(n, exp, fds.ex))) |
1480 | goto out; |
1481 | zero_fd_set(n, fds.res_in); |
1482 | zero_fd_set(n, fds.res_out); |
1483 | zero_fd_set(n, fds.res_ex); |
1484 | |
1485 | ret = do_select(n, &fds, end_time); |
1486 | |
1487 | if (ret < 0) |
1488 | goto out; |
1489 | if (!ret) { |
1490 | ret = -ERESTARTNOHAND; |
1491 | if (signal_pending(current)) |
1492 | goto out; |
1493 | ret = 0; |
1494 | } |
1495 | |
1496 | if (compat_set_fd_set(n, inp, fds.res_in) || |
1497 | compat_set_fd_set(n, outp, fds.res_out) || |
1498 | compat_set_fd_set(n, exp, fds.res_ex)) |
1499 | ret = -EFAULT; |
1500 | out: |
1501 | if (bits != stack_fds) |
1502 | kfree(bits); |
1503 | out_nofds: |
1504 | return ret; |
1505 | } |
1506 | |
1507 | asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, |
1508 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1509 | struct compat_timeval __user *tvp) |
1510 | { |
1511 | struct timespec end_time, *to = NULL; |
1512 | struct compat_timeval tv; |
1513 | int ret; |
1514 | |
1515 | if (tvp) { |
1516 | if (copy_from_user(&tv, tvp, sizeof(tv))) |
1517 | return -EFAULT; |
1518 | |
1519 | to = &end_time; |
1520 | if (poll_select_set_timeout(to, |
1521 | tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), |
1522 | (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) |
1523 | return -EINVAL; |
1524 | } |
1525 | |
1526 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1527 | ret = poll_select_copy_remaining(&end_time, tvp, 1, ret); |
1528 | |
1529 | return ret; |
1530 | } |
1531 | |
1532 | struct compat_sel_arg_struct { |
1533 | compat_ulong_t n; |
1534 | compat_uptr_t inp; |
1535 | compat_uptr_t outp; |
1536 | compat_uptr_t exp; |
1537 | compat_uptr_t tvp; |
1538 | }; |
1539 | |
1540 | asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg) |
1541 | { |
1542 | struct compat_sel_arg_struct a; |
1543 | |
1544 | if (copy_from_user(&a, arg, sizeof(a))) |
1545 | return -EFAULT; |
1546 | return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), |
1547 | compat_ptr(a.exp), compat_ptr(a.tvp)); |
1548 | } |
1549 | |
1550 | #ifdef HAVE_SET_RESTORE_SIGMASK |
1551 | static long do_compat_pselect(int n, compat_ulong_t __user *inp, |
1552 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1553 | struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, |
1554 | compat_size_t sigsetsize) |
1555 | { |
1556 | compat_sigset_t ss32; |
1557 | sigset_t ksigmask, sigsaved; |
1558 | struct compat_timespec ts; |
1559 | struct timespec end_time, *to = NULL; |
1560 | int ret; |
1561 | |
1562 | if (tsp) { |
1563 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
1564 | return -EFAULT; |
1565 | |
1566 | to = &end_time; |
1567 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
1568 | return -EINVAL; |
1569 | } |
1570 | |
1571 | if (sigmask) { |
1572 | if (sigsetsize != sizeof(compat_sigset_t)) |
1573 | return -EINVAL; |
1574 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
1575 | return -EFAULT; |
1576 | sigset_from_compat(&ksigmask, &ss32); |
1577 | |
1578 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1579 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
1580 | } |
1581 | |
1582 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1583 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
1584 | |
1585 | if (ret == -ERESTARTNOHAND) { |
1586 | /* |
1587 | * Don't restore the signal mask yet. Let do_signal() deliver |
1588 | * the signal on the way back to userspace, before the signal |
1589 | * mask is restored. |
1590 | */ |
1591 | if (sigmask) { |
1592 | memcpy(¤t->saved_sigmask, &sigsaved, |
1593 | sizeof(sigsaved)); |
1594 | set_restore_sigmask(); |
1595 | } |
1596 | } else if (sigmask) |
1597 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
1598 | |
1599 | return ret; |
1600 | } |
1601 | |
1602 | asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp, |
1603 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1604 | struct compat_timespec __user *tsp, void __user *sig) |
1605 | { |
1606 | compat_size_t sigsetsize = 0; |
1607 | compat_uptr_t up = 0; |
1608 | |
1609 | if (sig) { |
1610 | if (!access_ok(VERIFY_READ, sig, |
1611 | sizeof(compat_uptr_t)+sizeof(compat_size_t)) || |
1612 | __get_user(up, (compat_uptr_t __user *)sig) || |
1613 | __get_user(sigsetsize, |
1614 | (compat_size_t __user *)(sig+sizeof(up)))) |
1615 | return -EFAULT; |
1616 | } |
1617 | return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), |
1618 | sigsetsize); |
1619 | } |
1620 | |
1621 | asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, |
1622 | unsigned int nfds, struct compat_timespec __user *tsp, |
1623 | const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) |
1624 | { |
1625 | compat_sigset_t ss32; |
1626 | sigset_t ksigmask, sigsaved; |
1627 | struct compat_timespec ts; |
1628 | struct timespec end_time, *to = NULL; |
1629 | int ret; |
1630 | |
1631 | if (tsp) { |
1632 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
1633 | return -EFAULT; |
1634 | |
1635 | to = &end_time; |
1636 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
1637 | return -EINVAL; |
1638 | } |
1639 | |
1640 | if (sigmask) { |
1641 | if (sigsetsize != sizeof(compat_sigset_t)) |
1642 | return -EINVAL; |
1643 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
1644 | return -EFAULT; |
1645 | sigset_from_compat(&ksigmask, &ss32); |
1646 | |
1647 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1648 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
1649 | } |
1650 | |
1651 | ret = do_sys_poll(ufds, nfds, to); |
1652 | |
1653 | /* We can restart this syscall, usually */ |
1654 | if (ret == -EINTR) { |
1655 | /* |
1656 | * Don't restore the signal mask yet. Let do_signal() deliver |
1657 | * the signal on the way back to userspace, before the signal |
1658 | * mask is restored. |
1659 | */ |
1660 | if (sigmask) { |
1661 | memcpy(¤t->saved_sigmask, &sigsaved, |
1662 | sizeof(sigsaved)); |
1663 | set_restore_sigmask(); |
1664 | } |
1665 | ret = -ERESTARTNOHAND; |
1666 | } else if (sigmask) |
1667 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
1668 | |
1669 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
1670 | |
1671 | return ret; |
1672 | } |
1673 | #endif /* HAVE_SET_RESTORE_SIGMASK */ |
1674 | |
1675 | #ifdef CONFIG_EPOLL |
1676 | |
1677 | #ifdef HAVE_SET_RESTORE_SIGMASK |
1678 | asmlinkage long compat_sys_epoll_pwait(int epfd, |
1679 | struct compat_epoll_event __user *events, |
1680 | int maxevents, int timeout, |
1681 | const compat_sigset_t __user *sigmask, |
1682 | compat_size_t sigsetsize) |
1683 | { |
1684 | long err; |
1685 | compat_sigset_t csigmask; |
1686 | sigset_t ksigmask, sigsaved; |
1687 | |
1688 | /* |
1689 | * If the caller wants a certain signal mask to be set during the wait, |
1690 | * we apply it here. |
1691 | */ |
1692 | if (sigmask) { |
1693 | if (sigsetsize != sizeof(compat_sigset_t)) |
1694 | return -EINVAL; |
1695 | if (copy_from_user(&csigmask, sigmask, sizeof(csigmask))) |
1696 | return -EFAULT; |
1697 | sigset_from_compat(&ksigmask, &csigmask); |
1698 | sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP)); |
1699 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
1700 | } |
1701 | |
1702 | err = sys_epoll_wait(epfd, events, maxevents, timeout); |
1703 | |
1704 | /* |
1705 | * If we changed the signal mask, we need to restore the original one. |
1706 | * In case we've got a signal while waiting, we do not restore the |
1707 | * signal mask yet, and we allow do_signal() to deliver the signal on |
1708 | * the way back to userspace, before the signal mask is restored. |
1709 | */ |
1710 | if (sigmask) { |
1711 | if (err == -EINTR) { |
1712 | memcpy(¤t->saved_sigmask, &sigsaved, |
1713 | sizeof(sigsaved)); |
1714 | set_restore_sigmask(); |
1715 | } else |
1716 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
1717 | } |
1718 | |
1719 | return err; |
1720 | } |
1721 | #endif /* HAVE_SET_RESTORE_SIGMASK */ |
1722 | |
1723 | #endif /* CONFIG_EPOLL */ |
1724 | |
1725 | #ifdef CONFIG_SIGNALFD |
1726 | |
1727 | asmlinkage long compat_sys_signalfd4(int ufd, |
1728 | const compat_sigset_t __user *sigmask, |
1729 | compat_size_t sigsetsize, int flags) |
1730 | { |
1731 | compat_sigset_t ss32; |
1732 | sigset_t tmp; |
1733 | sigset_t __user *ksigmask; |
1734 | |
1735 | if (sigsetsize != sizeof(compat_sigset_t)) |
1736 | return -EINVAL; |
1737 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
1738 | return -EFAULT; |
1739 | sigset_from_compat(&tmp, &ss32); |
1740 | ksigmask = compat_alloc_user_space(sizeof(sigset_t)); |
1741 | if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t))) |
1742 | return -EFAULT; |
1743 | |
1744 | return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags); |
1745 | } |
1746 | |
1747 | asmlinkage long compat_sys_signalfd(int ufd, |
1748 | const compat_sigset_t __user *sigmask, |
1749 | compat_size_t sigsetsize) |
1750 | { |
1751 | return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0); |
1752 | } |
1753 | #endif /* CONFIG_SIGNALFD */ |
1754 | |
1755 | #ifdef CONFIG_TIMERFD |
1756 | |
1757 | asmlinkage long compat_sys_timerfd_settime(int ufd, int flags, |
1758 | const struct compat_itimerspec __user *utmr, |
1759 | struct compat_itimerspec __user *otmr) |
1760 | { |
1761 | int error; |
1762 | struct itimerspec t; |
1763 | struct itimerspec __user *ut; |
1764 | |
1765 | if (get_compat_itimerspec(&t, utmr)) |
1766 | return -EFAULT; |
1767 | ut = compat_alloc_user_space(2 * sizeof(struct itimerspec)); |
1768 | if (copy_to_user(&ut[0], &t, sizeof(t))) |
1769 | return -EFAULT; |
1770 | error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]); |
1771 | if (!error && otmr) |
1772 | error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) || |
1773 | put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
1774 | |
1775 | return error; |
1776 | } |
1777 | |
1778 | asmlinkage long compat_sys_timerfd_gettime(int ufd, |
1779 | struct compat_itimerspec __user *otmr) |
1780 | { |
1781 | int error; |
1782 | struct itimerspec t; |
1783 | struct itimerspec __user *ut; |
1784 | |
1785 | ut = compat_alloc_user_space(sizeof(struct itimerspec)); |
1786 | error = sys_timerfd_gettime(ufd, ut); |
1787 | if (!error) |
1788 | error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) || |
1789 | put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
1790 | |
1791 | return error; |
1792 | } |
1793 | |
1794 | #endif /* CONFIG_TIMERFD */ |
1795 | |
1796 | #ifdef CONFIG_FHANDLE |
1797 | /* |
1798 | * Exactly like fs/open.c:sys_open_by_handle_at(), except that it |
1799 | * doesn't set the O_LARGEFILE flag. |
1800 | */ |
1801 | asmlinkage long |
1802 | compat_sys_open_by_handle_at(int mountdirfd, |
1803 | struct file_handle __user *handle, int flags) |
1804 | { |
1805 | return do_handle_open(mountdirfd, handle, flags); |
1806 | } |
1807 | #endif |
1808 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9