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