Commit | Line | Data |
---|---|---|
08ce5f16 | 1 | /* |
47c59803 | 2 | * device_cgroup.c - device cgroup subsystem |
08ce5f16 SH |
3 | * |
4 | * Copyright 2007 IBM Corp | |
5 | */ | |
6 | ||
7 | #include <linux/device_cgroup.h> | |
8 | #include <linux/cgroup.h> | |
9 | #include <linux/ctype.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/uaccess.h> | |
29486df3 | 12 | #include <linux/seq_file.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
47c59803 | 14 | #include <linux/rcupdate.h> |
b4046f00 | 15 | #include <linux/mutex.h> |
08ce5f16 SH |
16 | |
17 | #define ACC_MKNOD 1 | |
18 | #define ACC_READ 2 | |
19 | #define ACC_WRITE 4 | |
20 | #define ACC_MASK (ACC_MKNOD | ACC_READ | ACC_WRITE) | |
21 | ||
22 | #define DEV_BLOCK 1 | |
23 | #define DEV_CHAR 2 | |
24 | #define DEV_ALL 4 /* this represents all devices */ | |
25 | ||
b4046f00 LZ |
26 | static DEFINE_MUTEX(devcgroup_mutex); |
27 | ||
08ce5f16 SH |
28 | /* |
29 | * whitelist locking rules: | |
b4046f00 | 30 | * hold devcgroup_mutex for update/read. |
47c59803 | 31 | * hold rcu_read_lock() for read. |
08ce5f16 SH |
32 | */ |
33 | ||
34 | struct dev_whitelist_item { | |
35 | u32 major, minor; | |
36 | short type; | |
37 | short access; | |
38 | struct list_head list; | |
4efd1a1b | 39 | struct rcu_head rcu; |
08ce5f16 SH |
40 | }; |
41 | ||
42 | struct dev_cgroup { | |
43 | struct cgroup_subsys_state css; | |
44 | struct list_head whitelist; | |
08ce5f16 SH |
45 | }; |
46 | ||
b66862f7 PE |
47 | static inline struct dev_cgroup *css_to_devcgroup(struct cgroup_subsys_state *s) |
48 | { | |
49 | return container_of(s, struct dev_cgroup, css); | |
50 | } | |
51 | ||
08ce5f16 SH |
52 | static inline struct dev_cgroup *cgroup_to_devcgroup(struct cgroup *cgroup) |
53 | { | |
b66862f7 | 54 | return css_to_devcgroup(cgroup_subsys_state(cgroup, devices_subsys_id)); |
08ce5f16 SH |
55 | } |
56 | ||
f92523e3 PM |
57 | static inline struct dev_cgroup *task_devcgroup(struct task_struct *task) |
58 | { | |
59 | return css_to_devcgroup(task_subsys_state(task, devices_subsys_id)); | |
60 | } | |
61 | ||
08ce5f16 SH |
62 | struct cgroup_subsys devices_subsys; |
63 | ||
64 | static int devcgroup_can_attach(struct cgroup_subsys *ss, | |
2f7ee569 | 65 | struct cgroup *new_cgrp, struct cgroup_taskset *set) |
08ce5f16 | 66 | { |
2f7ee569 | 67 | struct task_struct *task = cgroup_taskset_first(set); |
08ce5f16 | 68 | |
2f7ee569 TH |
69 | if (current != task && !capable(CAP_SYS_ADMIN)) |
70 | return -EPERM; | |
08ce5f16 SH |
71 | return 0; |
72 | } | |
73 | ||
74 | /* | |
b4046f00 | 75 | * called under devcgroup_mutex |
08ce5f16 SH |
76 | */ |
77 | static int dev_whitelist_copy(struct list_head *dest, struct list_head *orig) | |
78 | { | |
79 | struct dev_whitelist_item *wh, *tmp, *new; | |
80 | ||
81 | list_for_each_entry(wh, orig, list) { | |
2cdc7241 | 82 | new = kmemdup(wh, sizeof(*wh), GFP_KERNEL); |
08ce5f16 SH |
83 | if (!new) |
84 | goto free_and_exit; | |
08ce5f16 SH |
85 | list_add_tail(&new->list, dest); |
86 | } | |
87 | ||
88 | return 0; | |
89 | ||
90 | free_and_exit: | |
91 | list_for_each_entry_safe(wh, tmp, dest, list) { | |
92 | list_del(&wh->list); | |
93 | kfree(wh); | |
94 | } | |
95 | return -ENOMEM; | |
96 | } | |
97 | ||
98 | /* Stupid prototype - don't bother combining existing entries */ | |
99 | /* | |
b4046f00 | 100 | * called under devcgroup_mutex |
08ce5f16 SH |
101 | */ |
102 | static int dev_whitelist_add(struct dev_cgroup *dev_cgroup, | |
103 | struct dev_whitelist_item *wh) | |
104 | { | |
d1ee2971 | 105 | struct dev_whitelist_item *whcopy, *walk; |
08ce5f16 | 106 | |
2cdc7241 | 107 | whcopy = kmemdup(wh, sizeof(*wh), GFP_KERNEL); |
08ce5f16 SH |
108 | if (!whcopy) |
109 | return -ENOMEM; | |
110 | ||
d1ee2971 PE |
111 | list_for_each_entry(walk, &dev_cgroup->whitelist, list) { |
112 | if (walk->type != wh->type) | |
113 | continue; | |
114 | if (walk->major != wh->major) | |
115 | continue; | |
116 | if (walk->minor != wh->minor) | |
117 | continue; | |
118 | ||
119 | walk->access |= wh->access; | |
120 | kfree(whcopy); | |
121 | whcopy = NULL; | |
122 | } | |
123 | ||
124 | if (whcopy != NULL) | |
4efd1a1b | 125 | list_add_tail_rcu(&whcopy->list, &dev_cgroup->whitelist); |
08ce5f16 SH |
126 | return 0; |
127 | } | |
128 | ||
129 | /* | |
b4046f00 | 130 | * called under devcgroup_mutex |
08ce5f16 SH |
131 | */ |
132 | static void dev_whitelist_rm(struct dev_cgroup *dev_cgroup, | |
133 | struct dev_whitelist_item *wh) | |
134 | { | |
135 | struct dev_whitelist_item *walk, *tmp; | |
136 | ||
08ce5f16 SH |
137 | list_for_each_entry_safe(walk, tmp, &dev_cgroup->whitelist, list) { |
138 | if (walk->type == DEV_ALL) | |
139 | goto remove; | |
140 | if (walk->type != wh->type) | |
141 | continue; | |
142 | if (walk->major != ~0 && walk->major != wh->major) | |
143 | continue; | |
144 | if (walk->minor != ~0 && walk->minor != wh->minor) | |
145 | continue; | |
146 | ||
147 | remove: | |
148 | walk->access &= ~wh->access; | |
149 | if (!walk->access) { | |
4efd1a1b | 150 | list_del_rcu(&walk->list); |
6034f7e6 | 151 | kfree_rcu(walk, rcu); |
08ce5f16 SH |
152 | } |
153 | } | |
08ce5f16 SH |
154 | } |
155 | ||
156 | /* | |
157 | * called from kernel/cgroup.c with cgroup_lock() held. | |
158 | */ | |
159 | static struct cgroup_subsys_state *devcgroup_create(struct cgroup_subsys *ss, | |
160 | struct cgroup *cgroup) | |
161 | { | |
162 | struct dev_cgroup *dev_cgroup, *parent_dev_cgroup; | |
163 | struct cgroup *parent_cgroup; | |
164 | int ret; | |
165 | ||
166 | dev_cgroup = kzalloc(sizeof(*dev_cgroup), GFP_KERNEL); | |
167 | if (!dev_cgroup) | |
168 | return ERR_PTR(-ENOMEM); | |
169 | INIT_LIST_HEAD(&dev_cgroup->whitelist); | |
170 | parent_cgroup = cgroup->parent; | |
171 | ||
172 | if (parent_cgroup == NULL) { | |
173 | struct dev_whitelist_item *wh; | |
174 | wh = kmalloc(sizeof(*wh), GFP_KERNEL); | |
175 | if (!wh) { | |
176 | kfree(dev_cgroup); | |
177 | return ERR_PTR(-ENOMEM); | |
178 | } | |
179 | wh->minor = wh->major = ~0; | |
180 | wh->type = DEV_ALL; | |
7759fc9d | 181 | wh->access = ACC_MASK; |
08ce5f16 SH |
182 | list_add(&wh->list, &dev_cgroup->whitelist); |
183 | } else { | |
184 | parent_dev_cgroup = cgroup_to_devcgroup(parent_cgroup); | |
b4046f00 | 185 | mutex_lock(&devcgroup_mutex); |
08ce5f16 SH |
186 | ret = dev_whitelist_copy(&dev_cgroup->whitelist, |
187 | &parent_dev_cgroup->whitelist); | |
b4046f00 | 188 | mutex_unlock(&devcgroup_mutex); |
08ce5f16 SH |
189 | if (ret) { |
190 | kfree(dev_cgroup); | |
191 | return ERR_PTR(ret); | |
192 | } | |
193 | } | |
194 | ||
08ce5f16 SH |
195 | return &dev_cgroup->css; |
196 | } | |
197 | ||
198 | static void devcgroup_destroy(struct cgroup_subsys *ss, | |
199 | struct cgroup *cgroup) | |
200 | { | |
201 | struct dev_cgroup *dev_cgroup; | |
202 | struct dev_whitelist_item *wh, *tmp; | |
203 | ||
204 | dev_cgroup = cgroup_to_devcgroup(cgroup); | |
205 | list_for_each_entry_safe(wh, tmp, &dev_cgroup->whitelist, list) { | |
206 | list_del(&wh->list); | |
207 | kfree(wh); | |
208 | } | |
209 | kfree(dev_cgroup); | |
210 | } | |
211 | ||
212 | #define DEVCG_ALLOW 1 | |
213 | #define DEVCG_DENY 2 | |
29486df3 SH |
214 | #define DEVCG_LIST 3 |
215 | ||
17d213f8 | 216 | #define MAJMINLEN 13 |
29486df3 | 217 | #define ACCLEN 4 |
08ce5f16 SH |
218 | |
219 | static void set_access(char *acc, short access) | |
220 | { | |
221 | int idx = 0; | |
29486df3 | 222 | memset(acc, 0, ACCLEN); |
08ce5f16 SH |
223 | if (access & ACC_READ) |
224 | acc[idx++] = 'r'; | |
225 | if (access & ACC_WRITE) | |
226 | acc[idx++] = 'w'; | |
227 | if (access & ACC_MKNOD) | |
228 | acc[idx++] = 'm'; | |
229 | } | |
230 | ||
231 | static char type_to_char(short type) | |
232 | { | |
233 | if (type == DEV_ALL) | |
234 | return 'a'; | |
235 | if (type == DEV_CHAR) | |
236 | return 'c'; | |
237 | if (type == DEV_BLOCK) | |
238 | return 'b'; | |
239 | return 'X'; | |
240 | } | |
241 | ||
29486df3 | 242 | static void set_majmin(char *str, unsigned m) |
08ce5f16 | 243 | { |
08ce5f16 | 244 | if (m == ~0) |
7759fc9d | 245 | strcpy(str, "*"); |
08ce5f16 | 246 | else |
7759fc9d | 247 | sprintf(str, "%u", m); |
08ce5f16 SH |
248 | } |
249 | ||
29486df3 SH |
250 | static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft, |
251 | struct seq_file *m) | |
08ce5f16 | 252 | { |
29486df3 | 253 | struct dev_cgroup *devcgroup = cgroup_to_devcgroup(cgroup); |
08ce5f16 | 254 | struct dev_whitelist_item *wh; |
29486df3 | 255 | char maj[MAJMINLEN], min[MAJMINLEN], acc[ACCLEN]; |
08ce5f16 | 256 | |
4efd1a1b PE |
257 | rcu_read_lock(); |
258 | list_for_each_entry_rcu(wh, &devcgroup->whitelist, list) { | |
08ce5f16 | 259 | set_access(acc, wh->access); |
29486df3 SH |
260 | set_majmin(maj, wh->major); |
261 | set_majmin(min, wh->minor); | |
262 | seq_printf(m, "%c %s:%s %s\n", type_to_char(wh->type), | |
263 | maj, min, acc); | |
08ce5f16 | 264 | } |
4efd1a1b | 265 | rcu_read_unlock(); |
08ce5f16 | 266 | |
29486df3 | 267 | return 0; |
08ce5f16 SH |
268 | } |
269 | ||
270 | /* | |
271 | * may_access_whitelist: | |
272 | * does the access granted to dev_cgroup c contain the access | |
273 | * requested in whitelist item refwh. | |
274 | * return 1 if yes, 0 if no. | |
b4046f00 | 275 | * call with devcgroup_mutex held |
08ce5f16 SH |
276 | */ |
277 | static int may_access_whitelist(struct dev_cgroup *c, | |
278 | struct dev_whitelist_item *refwh) | |
279 | { | |
280 | struct dev_whitelist_item *whitem; | |
281 | ||
282 | list_for_each_entry(whitem, &c->whitelist, list) { | |
283 | if (whitem->type & DEV_ALL) | |
284 | return 1; | |
285 | if ((refwh->type & DEV_BLOCK) && !(whitem->type & DEV_BLOCK)) | |
286 | continue; | |
287 | if ((refwh->type & DEV_CHAR) && !(whitem->type & DEV_CHAR)) | |
288 | continue; | |
289 | if (whitem->major != ~0 && whitem->major != refwh->major) | |
290 | continue; | |
291 | if (whitem->minor != ~0 && whitem->minor != refwh->minor) | |
292 | continue; | |
ec229e83 | 293 | if (refwh->access & (~whitem->access)) |
08ce5f16 SH |
294 | continue; |
295 | return 1; | |
296 | } | |
297 | return 0; | |
298 | } | |
299 | ||
300 | /* | |
301 | * parent_has_perm: | |
302 | * when adding a new allow rule to a device whitelist, the rule | |
303 | * must be allowed in the parent device | |
304 | */ | |
f92523e3 | 305 | static int parent_has_perm(struct dev_cgroup *childcg, |
08ce5f16 SH |
306 | struct dev_whitelist_item *wh) |
307 | { | |
f92523e3 | 308 | struct cgroup *pcg = childcg->css.cgroup->parent; |
08ce5f16 | 309 | struct dev_cgroup *parent; |
08ce5f16 SH |
310 | |
311 | if (!pcg) | |
312 | return 1; | |
313 | parent = cgroup_to_devcgroup(pcg); | |
47c59803 | 314 | return may_access_whitelist(parent, wh); |
08ce5f16 SH |
315 | } |
316 | ||
317 | /* | |
318 | * Modify the whitelist using allow/deny rules. | |
319 | * CAP_SYS_ADMIN is needed for this. It's at least separate from CAP_MKNOD | |
320 | * so we can give a container CAP_MKNOD to let it create devices but not | |
321 | * modify the whitelist. | |
322 | * It seems likely we'll want to add a CAP_CONTAINER capability to allow | |
323 | * us to also grant CAP_SYS_ADMIN to containers without giving away the | |
324 | * device whitelist controls, but for now we'll stick with CAP_SYS_ADMIN | |
325 | * | |
326 | * Taking rules away is always allowed (given CAP_SYS_ADMIN). Granting | |
327 | * new access is only allowed if you're in the top-level cgroup, or your | |
328 | * parent cgroup has the access you're asking for. | |
329 | */ | |
f92523e3 PM |
330 | static int devcgroup_update_access(struct dev_cgroup *devcgroup, |
331 | int filetype, const char *buffer) | |
08ce5f16 | 332 | { |
f92523e3 | 333 | const char *b; |
7759fc9d | 334 | char *endp; |
c012a54a | 335 | int count; |
08ce5f16 SH |
336 | struct dev_whitelist_item wh; |
337 | ||
338 | if (!capable(CAP_SYS_ADMIN)) | |
339 | return -EPERM; | |
340 | ||
08ce5f16 SH |
341 | memset(&wh, 0, sizeof(wh)); |
342 | b = buffer; | |
343 | ||
344 | switch (*b) { | |
345 | case 'a': | |
346 | wh.type = DEV_ALL; | |
347 | wh.access = ACC_MASK; | |
d823f6bf LZ |
348 | wh.major = ~0; |
349 | wh.minor = ~0; | |
08ce5f16 SH |
350 | goto handle; |
351 | case 'b': | |
352 | wh.type = DEV_BLOCK; | |
353 | break; | |
354 | case 'c': | |
355 | wh.type = DEV_CHAR; | |
356 | break; | |
357 | default: | |
f92523e3 | 358 | return -EINVAL; |
08ce5f16 SH |
359 | } |
360 | b++; | |
f92523e3 PM |
361 | if (!isspace(*b)) |
362 | return -EINVAL; | |
08ce5f16 SH |
363 | b++; |
364 | if (*b == '*') { | |
365 | wh.major = ~0; | |
366 | b++; | |
367 | } else if (isdigit(*b)) { | |
7759fc9d LZ |
368 | wh.major = simple_strtoul(b, &endp, 10); |
369 | b = endp; | |
08ce5f16 | 370 | } else { |
f92523e3 | 371 | return -EINVAL; |
08ce5f16 | 372 | } |
f92523e3 PM |
373 | if (*b != ':') |
374 | return -EINVAL; | |
08ce5f16 SH |
375 | b++; |
376 | ||
377 | /* read minor */ | |
378 | if (*b == '*') { | |
379 | wh.minor = ~0; | |
380 | b++; | |
381 | } else if (isdigit(*b)) { | |
7759fc9d LZ |
382 | wh.minor = simple_strtoul(b, &endp, 10); |
383 | b = endp; | |
08ce5f16 | 384 | } else { |
f92523e3 | 385 | return -EINVAL; |
08ce5f16 | 386 | } |
f92523e3 PM |
387 | if (!isspace(*b)) |
388 | return -EINVAL; | |
08ce5f16 SH |
389 | for (b++, count = 0; count < 3; count++, b++) { |
390 | switch (*b) { | |
391 | case 'r': | |
392 | wh.access |= ACC_READ; | |
393 | break; | |
394 | case 'w': | |
395 | wh.access |= ACC_WRITE; | |
396 | break; | |
397 | case 'm': | |
398 | wh.access |= ACC_MKNOD; | |
399 | break; | |
400 | case '\n': | |
401 | case '\0': | |
402 | count = 3; | |
403 | break; | |
404 | default: | |
f92523e3 | 405 | return -EINVAL; |
08ce5f16 SH |
406 | } |
407 | } | |
408 | ||
409 | handle: | |
08ce5f16 SH |
410 | switch (filetype) { |
411 | case DEVCG_ALLOW: | |
f92523e3 PM |
412 | if (!parent_has_perm(devcgroup, &wh)) |
413 | return -EPERM; | |
414 | return dev_whitelist_add(devcgroup, &wh); | |
08ce5f16 SH |
415 | case DEVCG_DENY: |
416 | dev_whitelist_rm(devcgroup, &wh); | |
417 | break; | |
418 | default: | |
f92523e3 | 419 | return -EINVAL; |
08ce5f16 | 420 | } |
f92523e3 PM |
421 | return 0; |
422 | } | |
08ce5f16 | 423 | |
f92523e3 PM |
424 | static int devcgroup_access_write(struct cgroup *cgrp, struct cftype *cft, |
425 | const char *buffer) | |
426 | { | |
427 | int retval; | |
b4046f00 LZ |
428 | |
429 | mutex_lock(&devcgroup_mutex); | |
f92523e3 PM |
430 | retval = devcgroup_update_access(cgroup_to_devcgroup(cgrp), |
431 | cft->private, buffer); | |
b4046f00 | 432 | mutex_unlock(&devcgroup_mutex); |
08ce5f16 SH |
433 | return retval; |
434 | } | |
435 | ||
436 | static struct cftype dev_cgroup_files[] = { | |
437 | { | |
438 | .name = "allow", | |
f92523e3 | 439 | .write_string = devcgroup_access_write, |
08ce5f16 SH |
440 | .private = DEVCG_ALLOW, |
441 | }, | |
442 | { | |
443 | .name = "deny", | |
f92523e3 | 444 | .write_string = devcgroup_access_write, |
08ce5f16 SH |
445 | .private = DEVCG_DENY, |
446 | }, | |
29486df3 SH |
447 | { |
448 | .name = "list", | |
449 | .read_seq_string = devcgroup_seq_read, | |
450 | .private = DEVCG_LIST, | |
451 | }, | |
08ce5f16 SH |
452 | }; |
453 | ||
454 | static int devcgroup_populate(struct cgroup_subsys *ss, | |
455 | struct cgroup *cgroup) | |
456 | { | |
457 | return cgroup_add_files(cgroup, ss, dev_cgroup_files, | |
458 | ARRAY_SIZE(dev_cgroup_files)); | |
459 | } | |
460 | ||
461 | struct cgroup_subsys devices_subsys = { | |
462 | .name = "devices", | |
463 | .can_attach = devcgroup_can_attach, | |
464 | .create = devcgroup_create, | |
c5b60b5e | 465 | .destroy = devcgroup_destroy, |
08ce5f16 SH |
466 | .populate = devcgroup_populate, |
467 | .subsys_id = devices_subsys_id, | |
468 | }; | |
469 | ||
482e0cd3 | 470 | int __devcgroup_inode_permission(struct inode *inode, int mask) |
08ce5f16 | 471 | { |
08ce5f16 SH |
472 | struct dev_cgroup *dev_cgroup; |
473 | struct dev_whitelist_item *wh; | |
474 | ||
4efd1a1b | 475 | rcu_read_lock(); |
36fd71d2 LZ |
476 | |
477 | dev_cgroup = task_devcgroup(current); | |
478 | ||
4efd1a1b | 479 | list_for_each_entry_rcu(wh, &dev_cgroup->whitelist, list) { |
08ce5f16 | 480 | if (wh->type & DEV_ALL) |
cd500819 | 481 | goto found; |
08ce5f16 SH |
482 | if ((wh->type & DEV_BLOCK) && !S_ISBLK(inode->i_mode)) |
483 | continue; | |
484 | if ((wh->type & DEV_CHAR) && !S_ISCHR(inode->i_mode)) | |
485 | continue; | |
486 | if (wh->major != ~0 && wh->major != imajor(inode)) | |
487 | continue; | |
488 | if (wh->minor != ~0 && wh->minor != iminor(inode)) | |
489 | continue; | |
cd500819 | 490 | |
08ce5f16 SH |
491 | if ((mask & MAY_WRITE) && !(wh->access & ACC_WRITE)) |
492 | continue; | |
493 | if ((mask & MAY_READ) && !(wh->access & ACC_READ)) | |
494 | continue; | |
cd500819 | 495 | found: |
4efd1a1b | 496 | rcu_read_unlock(); |
08ce5f16 SH |
497 | return 0; |
498 | } | |
36fd71d2 | 499 | |
4efd1a1b | 500 | rcu_read_unlock(); |
08ce5f16 SH |
501 | |
502 | return -EPERM; | |
503 | } | |
504 | ||
505 | int devcgroup_inode_mknod(int mode, dev_t dev) | |
506 | { | |
08ce5f16 SH |
507 | struct dev_cgroup *dev_cgroup; |
508 | struct dev_whitelist_item *wh; | |
509 | ||
0b82ac37 SH |
510 | if (!S_ISBLK(mode) && !S_ISCHR(mode)) |
511 | return 0; | |
512 | ||
4efd1a1b | 513 | rcu_read_lock(); |
36fd71d2 LZ |
514 | |
515 | dev_cgroup = task_devcgroup(current); | |
516 | ||
116e0575 | 517 | list_for_each_entry_rcu(wh, &dev_cgroup->whitelist, list) { |
08ce5f16 | 518 | if (wh->type & DEV_ALL) |
cd500819 | 519 | goto found; |
08ce5f16 SH |
520 | if ((wh->type & DEV_BLOCK) && !S_ISBLK(mode)) |
521 | continue; | |
522 | if ((wh->type & DEV_CHAR) && !S_ISCHR(mode)) | |
523 | continue; | |
524 | if (wh->major != ~0 && wh->major != MAJOR(dev)) | |
525 | continue; | |
526 | if (wh->minor != ~0 && wh->minor != MINOR(dev)) | |
527 | continue; | |
cd500819 | 528 | |
08ce5f16 SH |
529 | if (!(wh->access & ACC_MKNOD)) |
530 | continue; | |
cd500819 | 531 | found: |
4efd1a1b | 532 | rcu_read_unlock(); |
08ce5f16 SH |
533 | return 0; |
534 | } | |
36fd71d2 | 535 | |
4efd1a1b | 536 | rcu_read_unlock(); |
36fd71d2 | 537 | |
08ce5f16 SH |
538 | return -EPERM; |
539 | } |