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