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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/readdir.c | |
4 | * | |
5 | * Copyright (C) 1995 Linus Torvalds | |
6 | */ | |
7 | ||
85c9fe8f | 8 | #include <linux/stddef.h> |
022a1692 | 9 | #include <linux/kernel.h> |
630d9c47 | 10 | #include <linux/export.h> |
1da177e4 LT |
11 | #include <linux/time.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/file.h> | |
1da177e4 | 16 | #include <linux/fs.h> |
d4c7cf6c | 17 | #include <linux/fsnotify.h> |
1da177e4 LT |
18 | #include <linux/dirent.h> |
19 | #include <linux/security.h> | |
20 | #include <linux/syscalls.h> | |
21 | #include <linux/unistd.h> | |
0460b2a2 | 22 | #include <linux/compat.h> |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
1da177e4 | 24 | |
9f79b78e LT |
25 | #include <asm/unaligned.h> |
26 | ||
27 | /* | |
28 | * Note the "unsafe_put_user() semantics: we goto a | |
29 | * label for errors. | |
9f79b78e LT |
30 | */ |
31 | #define unsafe_copy_dirent_name(_dst, _src, _len, label) do { \ | |
32 | char __user *dst = (_dst); \ | |
33 | const char *src = (_src); \ | |
34 | size_t len = (_len); \ | |
c512c691 LT |
35 | unsafe_put_user(0, dst+len, label); \ |
36 | unsafe_copy_to_user(dst, src, len, label); \ | |
9f79b78e LT |
37 | } while (0) |
38 | ||
39 | ||
5c0ba4e0 | 40 | int iterate_dir(struct file *file, struct dir_context *ctx) |
1da177e4 | 41 | { |
496ad9aa | 42 | struct inode *inode = file_inode(file); |
61922694 | 43 | bool shared = false; |
1da177e4 | 44 | int res = -ENOTDIR; |
61922694 AV |
45 | if (file->f_op->iterate_shared) |
46 | shared = true; | |
47 | else if (!file->f_op->iterate) | |
1da177e4 LT |
48 | goto out; |
49 | ||
50 | res = security_file_permission(file, MAY_READ); | |
51 | if (res) | |
52 | goto out; | |
53 | ||
0dc208b5 KT |
54 | if (shared) |
55 | res = down_read_killable(&inode->i_rwsem); | |
56 | else | |
00235411 | 57 | res = down_write_killable(&inode->i_rwsem); |
0dc208b5 KT |
58 | if (res) |
59 | goto out; | |
da784511 | 60 | |
1da177e4 LT |
61 | res = -ENOENT; |
62 | if (!IS_DEADDIR(inode)) { | |
2233f31a | 63 | ctx->pos = file->f_pos; |
61922694 AV |
64 | if (shared) |
65 | res = file->f_op->iterate_shared(file, ctx); | |
66 | else | |
67 | res = file->f_op->iterate(file, ctx); | |
2233f31a | 68 | file->f_pos = ctx->pos; |
d4c7cf6c | 69 | fsnotify_access(file); |
1da177e4 LT |
70 | file_accessed(file); |
71 | } | |
61922694 AV |
72 | if (shared) |
73 | inode_unlock_shared(inode); | |
74 | else | |
75 | inode_unlock(inode); | |
1da177e4 LT |
76 | out: |
77 | return res; | |
78 | } | |
5c0ba4e0 | 79 | EXPORT_SYMBOL(iterate_dir); |
1da177e4 | 80 | |
8a23eb80 LT |
81 | /* |
82 | * POSIX says that a dirent name cannot contain NULL or a '/'. | |
83 | * | |
84 | * It's not 100% clear what we should really do in this case. | |
85 | * The filesystem is clearly corrupted, but returning a hard | |
86 | * error means that you now don't see any of the other names | |
87 | * either, so that isn't a perfect alternative. | |
88 | * | |
89 | * And if you return an error, what error do you use? Several | |
90 | * filesystems seem to have decided on EUCLEAN being the error | |
91 | * code for EFSCORRUPTED, and that may be the error to use. Or | |
92 | * just EIO, which is perhaps more obvious to users. | |
93 | * | |
94 | * In order to see the other file names in the directory, the | |
95 | * caller might want to make this a "soft" error: skip the | |
96 | * entry, and return the error at the end instead. | |
97 | * | |
98 | * Note that this should likely do a "memchr(name, 0, len)" | |
99 | * check too, since that would be filesystem corruption as | |
100 | * well. However, that case can't actually confuse user space, | |
101 | * which has to do a strlen() on the name anyway to find the | |
102 | * filename length, and the above "soft error" worry means | |
103 | * that it's probably better left alone until we have that | |
104 | * issue clarified. | |
105 | */ | |
106 | static int verify_dirent_name(const char *name, int len) | |
107 | { | |
b9959c7a | 108 | if (!len) |
8a23eb80 | 109 | return -EIO; |
b9959c7a | 110 | if (memchr(name, '/', len)) |
8a23eb80 LT |
111 | return -EIO; |
112 | return 0; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Traditional linux readdir() handling.. | |
117 | * | |
118 | * "count=1" is a special case, meaning that the buffer is one | |
119 | * dirent-structure in size and that the code can't handle more | |
120 | * anyway. Thus the special "fillonedir()" function for that | |
121 | * case (the low-level handlers don't need to care about this). | |
122 | */ | |
1da177e4 LT |
123 | |
124 | #ifdef __ARCH_WANT_OLD_READDIR | |
125 | ||
126 | struct old_linux_dirent { | |
127 | unsigned long d_ino; | |
128 | unsigned long d_offset; | |
129 | unsigned short d_namlen; | |
130 | char d_name[1]; | |
131 | }; | |
132 | ||
133 | struct readdir_callback { | |
5c0ba4e0 | 134 | struct dir_context ctx; |
1da177e4 LT |
135 | struct old_linux_dirent __user * dirent; |
136 | int result; | |
137 | }; | |
138 | ||
ac7576f4 MS |
139 | static int fillonedir(struct dir_context *ctx, const char *name, int namlen, |
140 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 141 | { |
ac7576f4 MS |
142 | struct readdir_callback *buf = |
143 | container_of(ctx, struct readdir_callback, ctx); | |
1da177e4 | 144 | struct old_linux_dirent __user * dirent; |
afefdbb2 | 145 | unsigned long d_ino; |
1da177e4 LT |
146 | |
147 | if (buf->result) | |
148 | return -EINVAL; | |
afefdbb2 | 149 | d_ino = ino; |
8f3f655d AV |
150 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
151 | buf->result = -EOVERFLOW; | |
afefdbb2 | 152 | return -EOVERFLOW; |
8f3f655d | 153 | } |
1da177e4 LT |
154 | buf->result++; |
155 | dirent = buf->dirent; | |
96d4f267 | 156 | if (!access_ok(dirent, |
1da177e4 LT |
157 | (unsigned long)(dirent->d_name + namlen + 1) - |
158 | (unsigned long)dirent)) | |
159 | goto efault; | |
afefdbb2 | 160 | if ( __put_user(d_ino, &dirent->d_ino) || |
1da177e4 LT |
161 | __put_user(offset, &dirent->d_offset) || |
162 | __put_user(namlen, &dirent->d_namlen) || | |
163 | __copy_to_user(dirent->d_name, name, namlen) || | |
164 | __put_user(0, dirent->d_name + namlen)) | |
165 | goto efault; | |
166 | return 0; | |
167 | efault: | |
168 | buf->result = -EFAULT; | |
169 | return -EFAULT; | |
170 | } | |
171 | ||
d4e82042 HC |
172 | SYSCALL_DEFINE3(old_readdir, unsigned int, fd, |
173 | struct old_linux_dirent __user *, dirent, unsigned int, count) | |
1da177e4 LT |
174 | { |
175 | int error; | |
63b6df14 | 176 | struct fd f = fdget_pos(fd); |
ac6614b7 AV |
177 | struct readdir_callback buf = { |
178 | .ctx.actor = fillonedir, | |
179 | .dirent = dirent | |
180 | }; | |
1da177e4 | 181 | |
2903ff01 | 182 | if (!f.file) |
863ced7f | 183 | return -EBADF; |
1da177e4 | 184 | |
5c0ba4e0 | 185 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 | 186 | if (buf.result) |
1da177e4 LT |
187 | error = buf.result; |
188 | ||
63b6df14 | 189 | fdput_pos(f); |
1da177e4 LT |
190 | return error; |
191 | } | |
192 | ||
193 | #endif /* __ARCH_WANT_OLD_READDIR */ | |
194 | ||
195 | /* | |
196 | * New, all-improved, singing, dancing, iBCS2-compliant getdents() | |
197 | * interface. | |
198 | */ | |
199 | struct linux_dirent { | |
200 | unsigned long d_ino; | |
201 | unsigned long d_off; | |
202 | unsigned short d_reclen; | |
203 | char d_name[1]; | |
204 | }; | |
205 | ||
206 | struct getdents_callback { | |
5c0ba4e0 | 207 | struct dir_context ctx; |
1da177e4 LT |
208 | struct linux_dirent __user * current_dir; |
209 | struct linux_dirent __user * previous; | |
210 | int count; | |
211 | int error; | |
212 | }; | |
213 | ||
ac7576f4 MS |
214 | static int filldir(struct dir_context *ctx, const char *name, int namlen, |
215 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 LT |
216 | { |
217 | struct linux_dirent __user * dirent; | |
ac7576f4 MS |
218 | struct getdents_callback *buf = |
219 | container_of(ctx, struct getdents_callback, ctx); | |
afefdbb2 | 220 | unsigned long d_ino; |
85c9fe8f KW |
221 | int reclen = ALIGN(offsetof(struct linux_dirent, d_name) + namlen + 2, |
222 | sizeof(long)); | |
1da177e4 | 223 | |
8a23eb80 LT |
224 | buf->error = verify_dirent_name(name, namlen); |
225 | if (unlikely(buf->error)) | |
226 | return buf->error; | |
1da177e4 LT |
227 | buf->error = -EINVAL; /* only used if we fail.. */ |
228 | if (reclen > buf->count) | |
229 | return -EINVAL; | |
afefdbb2 | 230 | d_ino = ino; |
8f3f655d AV |
231 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
232 | buf->error = -EOVERFLOW; | |
afefdbb2 | 233 | return -EOVERFLOW; |
8f3f655d | 234 | } |
1da177e4 | 235 | dirent = buf->previous; |
9f79b78e LT |
236 | if (dirent && signal_pending(current)) |
237 | return -EINTR; | |
238 | ||
239 | /* | |
240 | * Note! This range-checks 'previous' (which may be NULL). | |
241 | * The real range was checked in getdents | |
242 | */ | |
243 | if (!user_access_begin(dirent, sizeof(*dirent))) | |
1da177e4 | 244 | goto efault; |
9f79b78e LT |
245 | if (dirent) |
246 | unsafe_put_user(offset, &dirent->d_off, efault_end); | |
247 | dirent = buf->current_dir; | |
248 | unsafe_put_user(d_ino, &dirent->d_ino, efault_end); | |
249 | unsafe_put_user(reclen, &dirent->d_reclen, efault_end); | |
250 | unsafe_put_user(d_type, (char __user *) dirent + reclen - 1, efault_end); | |
251 | unsafe_copy_dirent_name(dirent->d_name, name, namlen, efault_end); | |
252 | user_access_end(); | |
253 | ||
1da177e4 LT |
254 | buf->previous = dirent; |
255 | dirent = (void __user *)dirent + reclen; | |
256 | buf->current_dir = dirent; | |
257 | buf->count -= reclen; | |
258 | return 0; | |
9f79b78e LT |
259 | efault_end: |
260 | user_access_end(); | |
1da177e4 LT |
261 | efault: |
262 | buf->error = -EFAULT; | |
263 | return -EFAULT; | |
264 | } | |
265 | ||
20f37034 HC |
266 | SYSCALL_DEFINE3(getdents, unsigned int, fd, |
267 | struct linux_dirent __user *, dirent, unsigned int, count) | |
1da177e4 | 268 | { |
2903ff01 | 269 | struct fd f; |
1da177e4 | 270 | struct linux_dirent __user * lastdirent; |
ac6614b7 AV |
271 | struct getdents_callback buf = { |
272 | .ctx.actor = filldir, | |
273 | .count = count, | |
274 | .current_dir = dirent | |
275 | }; | |
1da177e4 LT |
276 | int error; |
277 | ||
96d4f267 | 278 | if (!access_ok(dirent, count)) |
863ced7f | 279 | return -EFAULT; |
1da177e4 | 280 | |
63b6df14 | 281 | f = fdget_pos(fd); |
2903ff01 | 282 | if (!f.file) |
863ced7f | 283 | return -EBADF; |
1da177e4 | 284 | |
5c0ba4e0 | 285 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 AV |
286 | if (error >= 0) |
287 | error = buf.error; | |
1da177e4 LT |
288 | lastdirent = buf.previous; |
289 | if (lastdirent) { | |
bb6f619b | 290 | if (put_user(buf.ctx.pos, &lastdirent->d_off)) |
1da177e4 LT |
291 | error = -EFAULT; |
292 | else | |
293 | error = count - buf.count; | |
294 | } | |
63b6df14 | 295 | fdput_pos(f); |
1da177e4 LT |
296 | return error; |
297 | } | |
298 | ||
1da177e4 | 299 | struct getdents_callback64 { |
5c0ba4e0 | 300 | struct dir_context ctx; |
1da177e4 LT |
301 | struct linux_dirent64 __user * current_dir; |
302 | struct linux_dirent64 __user * previous; | |
303 | int count; | |
304 | int error; | |
305 | }; | |
306 | ||
ac7576f4 MS |
307 | static int filldir64(struct dir_context *ctx, const char *name, int namlen, |
308 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 LT |
309 | { |
310 | struct linux_dirent64 __user *dirent; | |
ac7576f4 MS |
311 | struct getdents_callback64 *buf = |
312 | container_of(ctx, struct getdents_callback64, ctx); | |
85c9fe8f KW |
313 | int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, |
314 | sizeof(u64)); | |
1da177e4 | 315 | |
8a23eb80 LT |
316 | buf->error = verify_dirent_name(name, namlen); |
317 | if (unlikely(buf->error)) | |
318 | return buf->error; | |
1da177e4 LT |
319 | buf->error = -EINVAL; /* only used if we fail.. */ |
320 | if (reclen > buf->count) | |
321 | return -EINVAL; | |
322 | dirent = buf->previous; | |
9f79b78e LT |
323 | if (dirent && signal_pending(current)) |
324 | return -EINTR; | |
325 | ||
326 | /* | |
327 | * Note! This range-checks 'previous' (which may be NULL). | |
328 | * The real range was checked in getdents | |
329 | */ | |
330 | if (!user_access_begin(dirent, sizeof(*dirent))) | |
1da177e4 | 331 | goto efault; |
9f79b78e LT |
332 | if (dirent) |
333 | unsafe_put_user(offset, &dirent->d_off, efault_end); | |
334 | dirent = buf->current_dir; | |
335 | unsafe_put_user(ino, &dirent->d_ino, efault_end); | |
336 | unsafe_put_user(reclen, &dirent->d_reclen, efault_end); | |
337 | unsafe_put_user(d_type, &dirent->d_type, efault_end); | |
338 | unsafe_copy_dirent_name(dirent->d_name, name, namlen, efault_end); | |
339 | user_access_end(); | |
340 | ||
1da177e4 LT |
341 | buf->previous = dirent; |
342 | dirent = (void __user *)dirent + reclen; | |
343 | buf->current_dir = dirent; | |
344 | buf->count -= reclen; | |
345 | return 0; | |
9f79b78e LT |
346 | efault_end: |
347 | user_access_end(); | |
1da177e4 LT |
348 | efault: |
349 | buf->error = -EFAULT; | |
350 | return -EFAULT; | |
351 | } | |
352 | ||
454dab3f DB |
353 | int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent, |
354 | unsigned int count) | |
1da177e4 | 355 | { |
2903ff01 | 356 | struct fd f; |
1da177e4 | 357 | struct linux_dirent64 __user * lastdirent; |
ac6614b7 AV |
358 | struct getdents_callback64 buf = { |
359 | .ctx.actor = filldir64, | |
360 | .count = count, | |
361 | .current_dir = dirent | |
362 | }; | |
1da177e4 LT |
363 | int error; |
364 | ||
96d4f267 | 365 | if (!access_ok(dirent, count)) |
863ced7f | 366 | return -EFAULT; |
1da177e4 | 367 | |
63b6df14 | 368 | f = fdget_pos(fd); |
2903ff01 | 369 | if (!f.file) |
863ced7f | 370 | return -EBADF; |
1da177e4 | 371 | |
5c0ba4e0 | 372 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 AV |
373 | if (error >= 0) |
374 | error = buf.error; | |
1da177e4 LT |
375 | lastdirent = buf.previous; |
376 | if (lastdirent) { | |
bb6f619b | 377 | typeof(lastdirent->d_off) d_off = buf.ctx.pos; |
1da177e4 | 378 | if (__put_user(d_off, &lastdirent->d_off)) |
53c9c5c0 AV |
379 | error = -EFAULT; |
380 | else | |
381 | error = count - buf.count; | |
1da177e4 | 382 | } |
63b6df14 | 383 | fdput_pos(f); |
1da177e4 LT |
384 | return error; |
385 | } | |
0460b2a2 | 386 | |
454dab3f DB |
387 | |
388 | SYSCALL_DEFINE3(getdents64, unsigned int, fd, | |
389 | struct linux_dirent64 __user *, dirent, unsigned int, count) | |
390 | { | |
391 | return ksys_getdents64(fd, dirent, count); | |
392 | } | |
393 | ||
0460b2a2 AV |
394 | #ifdef CONFIG_COMPAT |
395 | struct compat_old_linux_dirent { | |
396 | compat_ulong_t d_ino; | |
397 | compat_ulong_t d_offset; | |
398 | unsigned short d_namlen; | |
399 | char d_name[1]; | |
400 | }; | |
401 | ||
402 | struct compat_readdir_callback { | |
403 | struct dir_context ctx; | |
404 | struct compat_old_linux_dirent __user *dirent; | |
405 | int result; | |
406 | }; | |
407 | ||
408 | static int compat_fillonedir(struct dir_context *ctx, const char *name, | |
409 | int namlen, loff_t offset, u64 ino, | |
410 | unsigned int d_type) | |
411 | { | |
412 | struct compat_readdir_callback *buf = | |
413 | container_of(ctx, struct compat_readdir_callback, ctx); | |
414 | struct compat_old_linux_dirent __user *dirent; | |
415 | compat_ulong_t d_ino; | |
416 | ||
417 | if (buf->result) | |
418 | return -EINVAL; | |
419 | d_ino = ino; | |
420 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { | |
421 | buf->result = -EOVERFLOW; | |
422 | return -EOVERFLOW; | |
423 | } | |
424 | buf->result++; | |
425 | dirent = buf->dirent; | |
96d4f267 | 426 | if (!access_ok(dirent, |
0460b2a2 AV |
427 | (unsigned long)(dirent->d_name + namlen + 1) - |
428 | (unsigned long)dirent)) | |
429 | goto efault; | |
430 | if ( __put_user(d_ino, &dirent->d_ino) || | |
431 | __put_user(offset, &dirent->d_offset) || | |
432 | __put_user(namlen, &dirent->d_namlen) || | |
433 | __copy_to_user(dirent->d_name, name, namlen) || | |
434 | __put_user(0, dirent->d_name + namlen)) | |
435 | goto efault; | |
436 | return 0; | |
437 | efault: | |
438 | buf->result = -EFAULT; | |
439 | return -EFAULT; | |
440 | } | |
441 | ||
442 | COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, | |
443 | struct compat_old_linux_dirent __user *, dirent, unsigned int, count) | |
444 | { | |
445 | int error; | |
446 | struct fd f = fdget_pos(fd); | |
447 | struct compat_readdir_callback buf = { | |
448 | .ctx.actor = compat_fillonedir, | |
449 | .dirent = dirent | |
450 | }; | |
451 | ||
452 | if (!f.file) | |
453 | return -EBADF; | |
454 | ||
455 | error = iterate_dir(f.file, &buf.ctx); | |
456 | if (buf.result) | |
457 | error = buf.result; | |
458 | ||
459 | fdput_pos(f); | |
460 | return error; | |
461 | } | |
462 | ||
463 | struct compat_linux_dirent { | |
464 | compat_ulong_t d_ino; | |
465 | compat_ulong_t d_off; | |
466 | unsigned short d_reclen; | |
467 | char d_name[1]; | |
468 | }; | |
469 | ||
470 | struct compat_getdents_callback { | |
471 | struct dir_context ctx; | |
472 | struct compat_linux_dirent __user *current_dir; | |
473 | struct compat_linux_dirent __user *previous; | |
474 | int count; | |
475 | int error; | |
476 | }; | |
477 | ||
478 | static int compat_filldir(struct dir_context *ctx, const char *name, int namlen, | |
479 | loff_t offset, u64 ino, unsigned int d_type) | |
480 | { | |
481 | struct compat_linux_dirent __user * dirent; | |
482 | struct compat_getdents_callback *buf = | |
483 | container_of(ctx, struct compat_getdents_callback, ctx); | |
484 | compat_ulong_t d_ino; | |
485 | int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + | |
486 | namlen + 2, sizeof(compat_long_t)); | |
487 | ||
488 | buf->error = -EINVAL; /* only used if we fail.. */ | |
489 | if (reclen > buf->count) | |
490 | return -EINVAL; | |
491 | d_ino = ino; | |
492 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { | |
493 | buf->error = -EOVERFLOW; | |
494 | return -EOVERFLOW; | |
495 | } | |
496 | dirent = buf->previous; | |
497 | if (dirent) { | |
498 | if (signal_pending(current)) | |
499 | return -EINTR; | |
500 | if (__put_user(offset, &dirent->d_off)) | |
501 | goto efault; | |
502 | } | |
503 | dirent = buf->current_dir; | |
504 | if (__put_user(d_ino, &dirent->d_ino)) | |
505 | goto efault; | |
506 | if (__put_user(reclen, &dirent->d_reclen)) | |
507 | goto efault; | |
508 | if (copy_to_user(dirent->d_name, name, namlen)) | |
509 | goto efault; | |
510 | if (__put_user(0, dirent->d_name + namlen)) | |
511 | goto efault; | |
512 | if (__put_user(d_type, (char __user *) dirent + reclen - 1)) | |
513 | goto efault; | |
514 | buf->previous = dirent; | |
515 | dirent = (void __user *)dirent + reclen; | |
516 | buf->current_dir = dirent; | |
517 | buf->count -= reclen; | |
518 | return 0; | |
519 | efault: | |
520 | buf->error = -EFAULT; | |
521 | return -EFAULT; | |
522 | } | |
523 | ||
524 | COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, | |
525 | struct compat_linux_dirent __user *, dirent, unsigned int, count) | |
526 | { | |
527 | struct fd f; | |
528 | struct compat_linux_dirent __user * lastdirent; | |
529 | struct compat_getdents_callback buf = { | |
530 | .ctx.actor = compat_filldir, | |
531 | .current_dir = dirent, | |
532 | .count = count | |
533 | }; | |
534 | int error; | |
535 | ||
96d4f267 | 536 | if (!access_ok(dirent, count)) |
0460b2a2 AV |
537 | return -EFAULT; |
538 | ||
539 | f = fdget_pos(fd); | |
540 | if (!f.file) | |
541 | return -EBADF; | |
542 | ||
543 | error = iterate_dir(f.file, &buf.ctx); | |
544 | if (error >= 0) | |
545 | error = buf.error; | |
546 | lastdirent = buf.previous; | |
547 | if (lastdirent) { | |
548 | if (put_user(buf.ctx.pos, &lastdirent->d_off)) | |
549 | error = -EFAULT; | |
550 | else | |
551 | error = count - buf.count; | |
552 | } | |
553 | fdput_pos(f); | |
554 | return error; | |
555 | } | |
556 | #endif |