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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
11 | #include <linux/smp_lock.h> | |
12 | #include <linux/notifier.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/prctl.h> | |
1da177e4 LT |
15 | #include <linux/highuid.h> |
16 | #include <linux/fs.h> | |
dc009d92 EB |
17 | #include <linux/kernel.h> |
18 | #include <linux/kexec.h> | |
1da177e4 | 19 | #include <linux/workqueue.h> |
c59ede7b | 20 | #include <linux/capability.h> |
1da177e4 LT |
21 | #include <linux/device.h> |
22 | #include <linux/key.h> | |
23 | #include <linux/times.h> | |
24 | #include <linux/posix-timers.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/dcookies.h> | |
27 | #include <linux/suspend.h> | |
28 | #include <linux/tty.h> | |
7ed20e1a | 29 | #include <linux/signal.h> |
9f46080c | 30 | #include <linux/cn_proc.h> |
3cfc348b | 31 | #include <linux/getcpu.h> |
1da177e4 LT |
32 | |
33 | #include <linux/compat.h> | |
34 | #include <linux/syscalls.h> | |
00d7c05a | 35 | #include <linux/kprobes.h> |
1da177e4 LT |
36 | |
37 | #include <asm/uaccess.h> | |
38 | #include <asm/io.h> | |
39 | #include <asm/unistd.h> | |
40 | ||
41 | #ifndef SET_UNALIGN_CTL | |
42 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
43 | #endif | |
44 | #ifndef GET_UNALIGN_CTL | |
45 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
46 | #endif | |
47 | #ifndef SET_FPEMU_CTL | |
48 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
49 | #endif | |
50 | #ifndef GET_FPEMU_CTL | |
51 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
52 | #endif | |
53 | #ifndef SET_FPEXC_CTL | |
54 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
55 | #endif | |
56 | #ifndef GET_FPEXC_CTL | |
57 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
58 | #endif | |
651d765d AB |
59 | #ifndef GET_ENDIAN |
60 | # define GET_ENDIAN(a,b) (-EINVAL) | |
61 | #endif | |
62 | #ifndef SET_ENDIAN | |
63 | # define SET_ENDIAN(a,b) (-EINVAL) | |
64 | #endif | |
1da177e4 LT |
65 | |
66 | /* | |
67 | * this is where the system-wide overflow UID and GID are defined, for | |
68 | * architectures that now have 32-bit UID/GID but didn't in the past | |
69 | */ | |
70 | ||
71 | int overflowuid = DEFAULT_OVERFLOWUID; | |
72 | int overflowgid = DEFAULT_OVERFLOWGID; | |
73 | ||
74 | #ifdef CONFIG_UID16 | |
75 | EXPORT_SYMBOL(overflowuid); | |
76 | EXPORT_SYMBOL(overflowgid); | |
77 | #endif | |
78 | ||
79 | /* | |
80 | * the same as above, but for filesystems which can only store a 16-bit | |
81 | * UID and GID. as such, this is needed on all architectures | |
82 | */ | |
83 | ||
84 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
85 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
86 | ||
87 | EXPORT_SYMBOL(fs_overflowuid); | |
88 | EXPORT_SYMBOL(fs_overflowgid); | |
89 | ||
90 | /* | |
91 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
92 | */ | |
93 | ||
94 | int C_A_D = 1; | |
9ec52099 CLG |
95 | struct pid *cad_pid; |
96 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 LT |
97 | |
98 | /* | |
99 | * Notifier list for kernel code which wants to be called | |
100 | * at shutdown. This is used to stop any idling DMA operations | |
101 | * and the like. | |
102 | */ | |
103 | ||
e041c683 AS |
104 | static BLOCKING_NOTIFIER_HEAD(reboot_notifier_list); |
105 | ||
106 | /* | |
107 | * Notifier chain core routines. The exported routines below | |
108 | * are layered on top of these, with appropriate locking added. | |
109 | */ | |
110 | ||
111 | static int notifier_chain_register(struct notifier_block **nl, | |
112 | struct notifier_block *n) | |
113 | { | |
114 | while ((*nl) != NULL) { | |
115 | if (n->priority > (*nl)->priority) | |
116 | break; | |
117 | nl = &((*nl)->next); | |
118 | } | |
119 | n->next = *nl; | |
120 | rcu_assign_pointer(*nl, n); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static int notifier_chain_unregister(struct notifier_block **nl, | |
125 | struct notifier_block *n) | |
126 | { | |
127 | while ((*nl) != NULL) { | |
128 | if ((*nl) == n) { | |
129 | rcu_assign_pointer(*nl, n->next); | |
130 | return 0; | |
131 | } | |
132 | nl = &((*nl)->next); | |
133 | } | |
134 | return -ENOENT; | |
135 | } | |
136 | ||
137 | static int __kprobes notifier_call_chain(struct notifier_block **nl, | |
138 | unsigned long val, void *v) | |
139 | { | |
140 | int ret = NOTIFY_DONE; | |
bbb1747d | 141 | struct notifier_block *nb, *next_nb; |
e041c683 AS |
142 | |
143 | nb = rcu_dereference(*nl); | |
144 | while (nb) { | |
bbb1747d | 145 | next_nb = rcu_dereference(nb->next); |
e041c683 AS |
146 | ret = nb->notifier_call(nb, val, v); |
147 | if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) | |
148 | break; | |
bbb1747d | 149 | nb = next_nb; |
e041c683 AS |
150 | } |
151 | return ret; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Atomic notifier chain routines. Registration and unregistration | |
156 | * use a mutex, and call_chain is synchronized by RCU (no locks). | |
157 | */ | |
1da177e4 LT |
158 | |
159 | /** | |
e041c683 AS |
160 | * atomic_notifier_chain_register - Add notifier to an atomic notifier chain |
161 | * @nh: Pointer to head of the atomic notifier chain | |
1da177e4 LT |
162 | * @n: New entry in notifier chain |
163 | * | |
e041c683 | 164 | * Adds a notifier to an atomic notifier chain. |
1da177e4 LT |
165 | * |
166 | * Currently always returns zero. | |
167 | */ | |
e041c683 AS |
168 | |
169 | int atomic_notifier_chain_register(struct atomic_notifier_head *nh, | |
170 | struct notifier_block *n) | |
171 | { | |
172 | unsigned long flags; | |
173 | int ret; | |
174 | ||
175 | spin_lock_irqsave(&nh->lock, flags); | |
176 | ret = notifier_chain_register(&nh->head, n); | |
177 | spin_unlock_irqrestore(&nh->lock, flags); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | EXPORT_SYMBOL_GPL(atomic_notifier_chain_register); | |
182 | ||
183 | /** | |
184 | * atomic_notifier_chain_unregister - Remove notifier from an atomic notifier chain | |
185 | * @nh: Pointer to head of the atomic notifier chain | |
186 | * @n: Entry to remove from notifier chain | |
187 | * | |
188 | * Removes a notifier from an atomic notifier chain. | |
189 | * | |
190 | * Returns zero on success or %-ENOENT on failure. | |
191 | */ | |
192 | int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh, | |
193 | struct notifier_block *n) | |
194 | { | |
195 | unsigned long flags; | |
196 | int ret; | |
197 | ||
198 | spin_lock_irqsave(&nh->lock, flags); | |
199 | ret = notifier_chain_unregister(&nh->head, n); | |
200 | spin_unlock_irqrestore(&nh->lock, flags); | |
201 | synchronize_rcu(); | |
202 | return ret; | |
203 | } | |
204 | ||
205 | EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister); | |
206 | ||
207 | /** | |
208 | * atomic_notifier_call_chain - Call functions in an atomic notifier chain | |
209 | * @nh: Pointer to head of the atomic notifier chain | |
210 | * @val: Value passed unmodified to notifier function | |
211 | * @v: Pointer passed unmodified to notifier function | |
212 | * | |
213 | * Calls each function in a notifier chain in turn. The functions | |
214 | * run in an atomic context, so they must not block. | |
215 | * This routine uses RCU to synchronize with changes to the chain. | |
216 | * | |
217 | * If the return value of the notifier can be and'ed | |
218 | * with %NOTIFY_STOP_MASK then atomic_notifier_call_chain | |
219 | * will return immediately, with the return value of | |
220 | * the notifier function which halted execution. | |
221 | * Otherwise the return value is the return value | |
222 | * of the last notifier function called. | |
223 | */ | |
1da177e4 | 224 | |
f2aa85a0 | 225 | int __kprobes atomic_notifier_call_chain(struct atomic_notifier_head *nh, |
e041c683 | 226 | unsigned long val, void *v) |
1da177e4 | 227 | { |
e041c683 AS |
228 | int ret; |
229 | ||
230 | rcu_read_lock(); | |
231 | ret = notifier_call_chain(&nh->head, val, v); | |
232 | rcu_read_unlock(); | |
233 | return ret; | |
1da177e4 LT |
234 | } |
235 | ||
e041c683 AS |
236 | EXPORT_SYMBOL_GPL(atomic_notifier_call_chain); |
237 | ||
238 | /* | |
239 | * Blocking notifier chain routines. All access to the chain is | |
240 | * synchronized by an rwsem. | |
241 | */ | |
1da177e4 LT |
242 | |
243 | /** | |
e041c683 AS |
244 | * blocking_notifier_chain_register - Add notifier to a blocking notifier chain |
245 | * @nh: Pointer to head of the blocking notifier chain | |
1da177e4 LT |
246 | * @n: New entry in notifier chain |
247 | * | |
e041c683 AS |
248 | * Adds a notifier to a blocking notifier chain. |
249 | * Must be called in process context. | |
1da177e4 | 250 | * |
e041c683 | 251 | * Currently always returns zero. |
1da177e4 LT |
252 | */ |
253 | ||
e041c683 AS |
254 | int blocking_notifier_chain_register(struct blocking_notifier_head *nh, |
255 | struct notifier_block *n) | |
1da177e4 | 256 | { |
e041c683 AS |
257 | int ret; |
258 | ||
259 | /* | |
260 | * This code gets used during boot-up, when task switching is | |
261 | * not yet working and interrupts must remain disabled. At | |
262 | * such times we must not call down_write(). | |
263 | */ | |
264 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
265 | return notifier_chain_register(&nh->head, n); | |
266 | ||
267 | down_write(&nh->rwsem); | |
268 | ret = notifier_chain_register(&nh->head, n); | |
269 | up_write(&nh->rwsem); | |
270 | return ret; | |
1da177e4 LT |
271 | } |
272 | ||
e041c683 | 273 | EXPORT_SYMBOL_GPL(blocking_notifier_chain_register); |
1da177e4 LT |
274 | |
275 | /** | |
e041c683 AS |
276 | * blocking_notifier_chain_unregister - Remove notifier from a blocking notifier chain |
277 | * @nh: Pointer to head of the blocking notifier chain | |
278 | * @n: Entry to remove from notifier chain | |
279 | * | |
280 | * Removes a notifier from a blocking notifier chain. | |
281 | * Must be called from process context. | |
282 | * | |
283 | * Returns zero on success or %-ENOENT on failure. | |
284 | */ | |
285 | int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh, | |
286 | struct notifier_block *n) | |
287 | { | |
288 | int ret; | |
289 | ||
290 | /* | |
291 | * This code gets used during boot-up, when task switching is | |
292 | * not yet working and interrupts must remain disabled. At | |
293 | * such times we must not call down_write(). | |
294 | */ | |
295 | if (unlikely(system_state == SYSTEM_BOOTING)) | |
296 | return notifier_chain_unregister(&nh->head, n); | |
297 | ||
298 | down_write(&nh->rwsem); | |
299 | ret = notifier_chain_unregister(&nh->head, n); | |
300 | up_write(&nh->rwsem); | |
301 | return ret; | |
302 | } | |
303 | ||
304 | EXPORT_SYMBOL_GPL(blocking_notifier_chain_unregister); | |
305 | ||
306 | /** | |
307 | * blocking_notifier_call_chain - Call functions in a blocking notifier chain | |
308 | * @nh: Pointer to head of the blocking notifier chain | |
1da177e4 LT |
309 | * @val: Value passed unmodified to notifier function |
310 | * @v: Pointer passed unmodified to notifier function | |
311 | * | |
e041c683 AS |
312 | * Calls each function in a notifier chain in turn. The functions |
313 | * run in a process context, so they are allowed to block. | |
1da177e4 | 314 | * |
e041c683 AS |
315 | * If the return value of the notifier can be and'ed |
316 | * with %NOTIFY_STOP_MASK then blocking_notifier_call_chain | |
1da177e4 LT |
317 | * will return immediately, with the return value of |
318 | * the notifier function which halted execution. | |
e041c683 | 319 | * Otherwise the return value is the return value |
1da177e4 LT |
320 | * of the last notifier function called. |
321 | */ | |
322 | ||
e041c683 AS |
323 | int blocking_notifier_call_chain(struct blocking_notifier_head *nh, |
324 | unsigned long val, void *v) | |
1da177e4 | 325 | { |
e041c683 AS |
326 | int ret; |
327 | ||
328 | down_read(&nh->rwsem); | |
329 | ret = notifier_call_chain(&nh->head, val, v); | |
330 | up_read(&nh->rwsem); | |
1da177e4 LT |
331 | return ret; |
332 | } | |
333 | ||
e041c683 AS |
334 | EXPORT_SYMBOL_GPL(blocking_notifier_call_chain); |
335 | ||
336 | /* | |
337 | * Raw notifier chain routines. There is no protection; | |
338 | * the caller must provide it. Use at your own risk! | |
339 | */ | |
340 | ||
341 | /** | |
342 | * raw_notifier_chain_register - Add notifier to a raw notifier chain | |
343 | * @nh: Pointer to head of the raw notifier chain | |
344 | * @n: New entry in notifier chain | |
345 | * | |
346 | * Adds a notifier to a raw notifier chain. | |
347 | * All locking must be provided by the caller. | |
348 | * | |
349 | * Currently always returns zero. | |
350 | */ | |
351 | ||
352 | int raw_notifier_chain_register(struct raw_notifier_head *nh, | |
353 | struct notifier_block *n) | |
354 | { | |
355 | return notifier_chain_register(&nh->head, n); | |
356 | } | |
357 | ||
358 | EXPORT_SYMBOL_GPL(raw_notifier_chain_register); | |
359 | ||
360 | /** | |
361 | * raw_notifier_chain_unregister - Remove notifier from a raw notifier chain | |
362 | * @nh: Pointer to head of the raw notifier chain | |
363 | * @n: Entry to remove from notifier chain | |
364 | * | |
365 | * Removes a notifier from a raw notifier chain. | |
366 | * All locking must be provided by the caller. | |
367 | * | |
368 | * Returns zero on success or %-ENOENT on failure. | |
369 | */ | |
370 | int raw_notifier_chain_unregister(struct raw_notifier_head *nh, | |
371 | struct notifier_block *n) | |
372 | { | |
373 | return notifier_chain_unregister(&nh->head, n); | |
374 | } | |
375 | ||
376 | EXPORT_SYMBOL_GPL(raw_notifier_chain_unregister); | |
377 | ||
378 | /** | |
379 | * raw_notifier_call_chain - Call functions in a raw notifier chain | |
380 | * @nh: Pointer to head of the raw notifier chain | |
381 | * @val: Value passed unmodified to notifier function | |
382 | * @v: Pointer passed unmodified to notifier function | |
383 | * | |
384 | * Calls each function in a notifier chain in turn. The functions | |
385 | * run in an undefined context. | |
386 | * All locking must be provided by the caller. | |
387 | * | |
388 | * If the return value of the notifier can be and'ed | |
389 | * with %NOTIFY_STOP_MASK then raw_notifier_call_chain | |
390 | * will return immediately, with the return value of | |
391 | * the notifier function which halted execution. | |
392 | * Otherwise the return value is the return value | |
393 | * of the last notifier function called. | |
394 | */ | |
395 | ||
396 | int raw_notifier_call_chain(struct raw_notifier_head *nh, | |
397 | unsigned long val, void *v) | |
398 | { | |
399 | return notifier_call_chain(&nh->head, val, v); | |
400 | } | |
401 | ||
402 | EXPORT_SYMBOL_GPL(raw_notifier_call_chain); | |
1da177e4 LT |
403 | |
404 | /** | |
405 | * register_reboot_notifier - Register function to be called at reboot time | |
406 | * @nb: Info about notifier function to be called | |
407 | * | |
408 | * Registers a function with the list of functions | |
409 | * to be called at reboot time. | |
410 | * | |
e041c683 | 411 | * Currently always returns zero, as blocking_notifier_chain_register |
1da177e4 LT |
412 | * always returns zero. |
413 | */ | |
414 | ||
415 | int register_reboot_notifier(struct notifier_block * nb) | |
416 | { | |
e041c683 | 417 | return blocking_notifier_chain_register(&reboot_notifier_list, nb); |
1da177e4 LT |
418 | } |
419 | ||
420 | EXPORT_SYMBOL(register_reboot_notifier); | |
421 | ||
422 | /** | |
423 | * unregister_reboot_notifier - Unregister previously registered reboot notifier | |
424 | * @nb: Hook to be unregistered | |
425 | * | |
426 | * Unregisters a previously registered reboot | |
427 | * notifier function. | |
428 | * | |
429 | * Returns zero on success, or %-ENOENT on failure. | |
430 | */ | |
431 | ||
432 | int unregister_reboot_notifier(struct notifier_block * nb) | |
433 | { | |
e041c683 | 434 | return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); |
1da177e4 LT |
435 | } |
436 | ||
437 | EXPORT_SYMBOL(unregister_reboot_notifier); | |
438 | ||
439 | static int set_one_prio(struct task_struct *p, int niceval, int error) | |
440 | { | |
441 | int no_nice; | |
442 | ||
443 | if (p->uid != current->euid && | |
444 | p->euid != current->euid && !capable(CAP_SYS_NICE)) { | |
445 | error = -EPERM; | |
446 | goto out; | |
447 | } | |
e43379f1 | 448 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
449 | error = -EACCES; |
450 | goto out; | |
451 | } | |
452 | no_nice = security_task_setnice(p, niceval); | |
453 | if (no_nice) { | |
454 | error = no_nice; | |
455 | goto out; | |
456 | } | |
457 | if (error == -ESRCH) | |
458 | error = 0; | |
459 | set_user_nice(p, niceval); | |
460 | out: | |
461 | return error; | |
462 | } | |
463 | ||
464 | asmlinkage long sys_setpriority(int which, int who, int niceval) | |
465 | { | |
466 | struct task_struct *g, *p; | |
467 | struct user_struct *user; | |
468 | int error = -EINVAL; | |
469 | ||
470 | if (which > 2 || which < 0) | |
471 | goto out; | |
472 | ||
473 | /* normalize: avoid signed division (rounding problems) */ | |
474 | error = -ESRCH; | |
475 | if (niceval < -20) | |
476 | niceval = -20; | |
477 | if (niceval > 19) | |
478 | niceval = 19; | |
479 | ||
480 | read_lock(&tasklist_lock); | |
481 | switch (which) { | |
482 | case PRIO_PROCESS: | |
483 | if (!who) | |
484 | who = current->pid; | |
485 | p = find_task_by_pid(who); | |
486 | if (p) | |
487 | error = set_one_prio(p, niceval, error); | |
488 | break; | |
489 | case PRIO_PGRP: | |
490 | if (!who) | |
491 | who = process_group(current); | |
492 | do_each_task_pid(who, PIDTYPE_PGID, p) { | |
493 | error = set_one_prio(p, niceval, error); | |
494 | } while_each_task_pid(who, PIDTYPE_PGID, p); | |
495 | break; | |
496 | case PRIO_USER: | |
497 | user = current->user; | |
498 | if (!who) | |
499 | who = current->uid; | |
500 | else | |
501 | if ((who != current->uid) && !(user = find_user(who))) | |
502 | goto out_unlock; /* No processes for this user */ | |
503 | ||
504 | do_each_thread(g, p) | |
505 | if (p->uid == who) | |
506 | error = set_one_prio(p, niceval, error); | |
507 | while_each_thread(g, p); | |
508 | if (who != current->uid) | |
509 | free_uid(user); /* For find_user() */ | |
510 | break; | |
511 | } | |
512 | out_unlock: | |
513 | read_unlock(&tasklist_lock); | |
514 | out: | |
515 | return error; | |
516 | } | |
517 | ||
518 | /* | |
519 | * Ugh. To avoid negative return values, "getpriority()" will | |
520 | * not return the normal nice-value, but a negated value that | |
521 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
522 | * to stay compatible. | |
523 | */ | |
524 | asmlinkage long sys_getpriority(int which, int who) | |
525 | { | |
526 | struct task_struct *g, *p; | |
527 | struct user_struct *user; | |
528 | long niceval, retval = -ESRCH; | |
529 | ||
530 | if (which > 2 || which < 0) | |
531 | return -EINVAL; | |
532 | ||
533 | read_lock(&tasklist_lock); | |
534 | switch (which) { | |
535 | case PRIO_PROCESS: | |
536 | if (!who) | |
537 | who = current->pid; | |
538 | p = find_task_by_pid(who); | |
539 | if (p) { | |
540 | niceval = 20 - task_nice(p); | |
541 | if (niceval > retval) | |
542 | retval = niceval; | |
543 | } | |
544 | break; | |
545 | case PRIO_PGRP: | |
546 | if (!who) | |
547 | who = process_group(current); | |
548 | do_each_task_pid(who, PIDTYPE_PGID, p) { | |
549 | niceval = 20 - task_nice(p); | |
550 | if (niceval > retval) | |
551 | retval = niceval; | |
552 | } while_each_task_pid(who, PIDTYPE_PGID, p); | |
553 | break; | |
554 | case PRIO_USER: | |
555 | user = current->user; | |
556 | if (!who) | |
557 | who = current->uid; | |
558 | else | |
559 | if ((who != current->uid) && !(user = find_user(who))) | |
560 | goto out_unlock; /* No processes for this user */ | |
561 | ||
562 | do_each_thread(g, p) | |
563 | if (p->uid == who) { | |
564 | niceval = 20 - task_nice(p); | |
565 | if (niceval > retval) | |
566 | retval = niceval; | |
567 | } | |
568 | while_each_thread(g, p); | |
569 | if (who != current->uid) | |
570 | free_uid(user); /* for find_user() */ | |
571 | break; | |
572 | } | |
573 | out_unlock: | |
574 | read_unlock(&tasklist_lock); | |
575 | ||
576 | return retval; | |
577 | } | |
578 | ||
e4c94330 EB |
579 | /** |
580 | * emergency_restart - reboot the system | |
581 | * | |
582 | * Without shutting down any hardware or taking any locks | |
583 | * reboot the system. This is called when we know we are in | |
584 | * trouble so this is our best effort to reboot. This is | |
585 | * safe to call in interrupt context. | |
586 | */ | |
7c903473 EB |
587 | void emergency_restart(void) |
588 | { | |
589 | machine_emergency_restart(); | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(emergency_restart); | |
592 | ||
83cc5ed3 | 593 | static void kernel_restart_prepare(char *cmd) |
4a00ea1e | 594 | { |
e041c683 | 595 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 596 | system_state = SYSTEM_RESTART; |
4a00ea1e | 597 | device_shutdown(); |
e4c94330 | 598 | } |
1e5d5331 RD |
599 | |
600 | /** | |
601 | * kernel_restart - reboot the system | |
602 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 603 | * or %NULL |
1e5d5331 RD |
604 | * |
605 | * Shutdown everything and perform a clean reboot. | |
606 | * This is not safe to call in interrupt context. | |
607 | */ | |
e4c94330 EB |
608 | void kernel_restart(char *cmd) |
609 | { | |
610 | kernel_restart_prepare(cmd); | |
756184b7 | 611 | if (!cmd) |
4a00ea1e | 612 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 613 | else |
4a00ea1e | 614 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
615 | machine_restart(cmd); |
616 | } | |
617 | EXPORT_SYMBOL_GPL(kernel_restart); | |
618 | ||
e4c94330 EB |
619 | /** |
620 | * kernel_kexec - reboot the system | |
621 | * | |
622 | * Move into place and start executing a preloaded standalone | |
623 | * executable. If nothing was preloaded return an error. | |
624 | */ | |
83cc5ed3 | 625 | static void kernel_kexec(void) |
4a00ea1e EB |
626 | { |
627 | #ifdef CONFIG_KEXEC | |
628 | struct kimage *image; | |
4bb8089c | 629 | image = xchg(&kexec_image, NULL); |
756184b7 | 630 | if (!image) |
4a00ea1e | 631 | return; |
e4c94330 | 632 | kernel_restart_prepare(NULL); |
4a00ea1e EB |
633 | printk(KERN_EMERG "Starting new kernel\n"); |
634 | machine_shutdown(); | |
635 | machine_kexec(image); | |
636 | #endif | |
637 | } | |
4a00ea1e | 638 | |
729b4d4c AS |
639 | void kernel_shutdown_prepare(enum system_states state) |
640 | { | |
e041c683 | 641 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
642 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
643 | system_state = state; | |
644 | device_shutdown(); | |
645 | } | |
e4c94330 EB |
646 | /** |
647 | * kernel_halt - halt the system | |
648 | * | |
649 | * Shutdown everything and perform a clean system halt. | |
650 | */ | |
e4c94330 EB |
651 | void kernel_halt(void) |
652 | { | |
729b4d4c | 653 | kernel_shutdown_prepare(SYSTEM_HALT); |
4a00ea1e EB |
654 | printk(KERN_EMERG "System halted.\n"); |
655 | machine_halt(); | |
656 | } | |
729b4d4c | 657 | |
4a00ea1e EB |
658 | EXPORT_SYMBOL_GPL(kernel_halt); |
659 | ||
e4c94330 EB |
660 | /** |
661 | * kernel_power_off - power_off the system | |
662 | * | |
663 | * Shutdown everything and perform a clean system power_off. | |
664 | */ | |
e4c94330 EB |
665 | void kernel_power_off(void) |
666 | { | |
729b4d4c | 667 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
4a00ea1e EB |
668 | printk(KERN_EMERG "Power down.\n"); |
669 | machine_power_off(); | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
1da177e4 LT |
672 | /* |
673 | * Reboot system call: for obvious reasons only root may call it, | |
674 | * and even root needs to set up some magic numbers in the registers | |
675 | * so that some mistake won't make this reboot the whole machine. | |
676 | * You can also set the meaning of the ctrl-alt-del-key here. | |
677 | * | |
678 | * reboot doesn't sync: do that yourself before calling this. | |
679 | */ | |
680 | asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) | |
681 | { | |
682 | char buffer[256]; | |
683 | ||
684 | /* We only trust the superuser with rebooting the system. */ | |
685 | if (!capable(CAP_SYS_BOOT)) | |
686 | return -EPERM; | |
687 | ||
688 | /* For safety, we require "magic" arguments. */ | |
689 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
690 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
691 | magic2 != LINUX_REBOOT_MAGIC2A && | |
692 | magic2 != LINUX_REBOOT_MAGIC2B && | |
693 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
694 | return -EINVAL; | |
695 | ||
5e38291d EB |
696 | /* Instead of trying to make the power_off code look like |
697 | * halt when pm_power_off is not set do it the easy way. | |
698 | */ | |
699 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
700 | cmd = LINUX_REBOOT_CMD_HALT; | |
701 | ||
1da177e4 LT |
702 | lock_kernel(); |
703 | switch (cmd) { | |
704 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 705 | kernel_restart(NULL); |
1da177e4 LT |
706 | break; |
707 | ||
708 | case LINUX_REBOOT_CMD_CAD_ON: | |
709 | C_A_D = 1; | |
710 | break; | |
711 | ||
712 | case LINUX_REBOOT_CMD_CAD_OFF: | |
713 | C_A_D = 0; | |
714 | break; | |
715 | ||
716 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 717 | kernel_halt(); |
1da177e4 LT |
718 | unlock_kernel(); |
719 | do_exit(0); | |
720 | break; | |
721 | ||
722 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 723 | kernel_power_off(); |
1da177e4 LT |
724 | unlock_kernel(); |
725 | do_exit(0); | |
726 | break; | |
727 | ||
728 | case LINUX_REBOOT_CMD_RESTART2: | |
729 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
730 | unlock_kernel(); | |
731 | return -EFAULT; | |
732 | } | |
733 | buffer[sizeof(buffer) - 1] = '\0'; | |
734 | ||
4a00ea1e | 735 | kernel_restart(buffer); |
1da177e4 LT |
736 | break; |
737 | ||
dc009d92 | 738 | case LINUX_REBOOT_CMD_KEXEC: |
4a00ea1e EB |
739 | kernel_kexec(); |
740 | unlock_kernel(); | |
741 | return -EINVAL; | |
742 | ||
1da177e4 LT |
743 | #ifdef CONFIG_SOFTWARE_SUSPEND |
744 | case LINUX_REBOOT_CMD_SW_SUSPEND: | |
745 | { | |
746 | int ret = software_suspend(); | |
747 | unlock_kernel(); | |
748 | return ret; | |
749 | } | |
750 | #endif | |
751 | ||
752 | default: | |
753 | unlock_kernel(); | |
754 | return -EINVAL; | |
755 | } | |
756 | unlock_kernel(); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static void deferred_cad(void *dummy) | |
761 | { | |
abcd9e51 | 762 | kernel_restart(NULL); |
1da177e4 LT |
763 | } |
764 | ||
765 | /* | |
766 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
767 | * As it's called within an interrupt, it may NOT sync: the only choice | |
768 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
769 | */ | |
770 | void ctrl_alt_del(void) | |
771 | { | |
772 | static DECLARE_WORK(cad_work, deferred_cad, NULL); | |
773 | ||
774 | if (C_A_D) | |
775 | schedule_work(&cad_work); | |
776 | else | |
9ec52099 | 777 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
778 | } |
779 | ||
1da177e4 LT |
780 | /* |
781 | * Unprivileged users may change the real gid to the effective gid | |
782 | * or vice versa. (BSD-style) | |
783 | * | |
784 | * If you set the real gid at all, or set the effective gid to a value not | |
785 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
786 | * | |
787 | * This makes it possible for a setgid program to completely drop its | |
788 | * privileges, which is often a useful assertion to make when you are doing | |
789 | * a security audit over a program. | |
790 | * | |
791 | * The general idea is that a program which uses just setregid() will be | |
792 | * 100% compatible with BSD. A program which uses just setgid() will be | |
793 | * 100% compatible with POSIX with saved IDs. | |
794 | * | |
795 | * SMP: There are not races, the GIDs are checked only by filesystem | |
796 | * operations (as far as semantic preservation is concerned). | |
797 | */ | |
798 | asmlinkage long sys_setregid(gid_t rgid, gid_t egid) | |
799 | { | |
800 | int old_rgid = current->gid; | |
801 | int old_egid = current->egid; | |
802 | int new_rgid = old_rgid; | |
803 | int new_egid = old_egid; | |
804 | int retval; | |
805 | ||
806 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); | |
807 | if (retval) | |
808 | return retval; | |
809 | ||
810 | if (rgid != (gid_t) -1) { | |
811 | if ((old_rgid == rgid) || | |
812 | (current->egid==rgid) || | |
813 | capable(CAP_SETGID)) | |
814 | new_rgid = rgid; | |
815 | else | |
816 | return -EPERM; | |
817 | } | |
818 | if (egid != (gid_t) -1) { | |
819 | if ((old_rgid == egid) || | |
820 | (current->egid == egid) || | |
821 | (current->sgid == egid) || | |
822 | capable(CAP_SETGID)) | |
823 | new_egid = egid; | |
756184b7 | 824 | else |
1da177e4 | 825 | return -EPERM; |
1da177e4 | 826 | } |
756184b7 | 827 | if (new_egid != old_egid) { |
d6e71144 | 828 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 829 | smp_wmb(); |
1da177e4 LT |
830 | } |
831 | if (rgid != (gid_t) -1 || | |
832 | (egid != (gid_t) -1 && egid != old_rgid)) | |
833 | current->sgid = new_egid; | |
834 | current->fsgid = new_egid; | |
835 | current->egid = new_egid; | |
836 | current->gid = new_rgid; | |
837 | key_fsgid_changed(current); | |
9f46080c | 838 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
839 | return 0; |
840 | } | |
841 | ||
842 | /* | |
843 | * setgid() is implemented like SysV w/ SAVED_IDS | |
844 | * | |
845 | * SMP: Same implicit races as above. | |
846 | */ | |
847 | asmlinkage long sys_setgid(gid_t gid) | |
848 | { | |
849 | int old_egid = current->egid; | |
850 | int retval; | |
851 | ||
852 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); | |
853 | if (retval) | |
854 | return retval; | |
855 | ||
756184b7 CP |
856 | if (capable(CAP_SETGID)) { |
857 | if (old_egid != gid) { | |
d6e71144 | 858 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 859 | smp_wmb(); |
1da177e4 LT |
860 | } |
861 | current->gid = current->egid = current->sgid = current->fsgid = gid; | |
756184b7 CP |
862 | } else if ((gid == current->gid) || (gid == current->sgid)) { |
863 | if (old_egid != gid) { | |
d6e71144 | 864 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 865 | smp_wmb(); |
1da177e4 LT |
866 | } |
867 | current->egid = current->fsgid = gid; | |
868 | } | |
869 | else | |
870 | return -EPERM; | |
871 | ||
872 | key_fsgid_changed(current); | |
9f46080c | 873 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
874 | return 0; |
875 | } | |
876 | ||
877 | static int set_user(uid_t new_ruid, int dumpclear) | |
878 | { | |
879 | struct user_struct *new_user; | |
880 | ||
881 | new_user = alloc_uid(new_ruid); | |
882 | if (!new_user) | |
883 | return -EAGAIN; | |
884 | ||
885 | if (atomic_read(&new_user->processes) >= | |
886 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
887 | new_user != &root_user) { | |
888 | free_uid(new_user); | |
889 | return -EAGAIN; | |
890 | } | |
891 | ||
892 | switch_uid(new_user); | |
893 | ||
756184b7 | 894 | if (dumpclear) { |
d6e71144 | 895 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 896 | smp_wmb(); |
1da177e4 LT |
897 | } |
898 | current->uid = new_ruid; | |
899 | return 0; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Unprivileged users may change the real uid to the effective uid | |
904 | * or vice versa. (BSD-style) | |
905 | * | |
906 | * If you set the real uid at all, or set the effective uid to a value not | |
907 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
908 | * | |
909 | * This makes it possible for a setuid program to completely drop its | |
910 | * privileges, which is often a useful assertion to make when you are doing | |
911 | * a security audit over a program. | |
912 | * | |
913 | * The general idea is that a program which uses just setreuid() will be | |
914 | * 100% compatible with BSD. A program which uses just setuid() will be | |
915 | * 100% compatible with POSIX with saved IDs. | |
916 | */ | |
917 | asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) | |
918 | { | |
919 | int old_ruid, old_euid, old_suid, new_ruid, new_euid; | |
920 | int retval; | |
921 | ||
922 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); | |
923 | if (retval) | |
924 | return retval; | |
925 | ||
926 | new_ruid = old_ruid = current->uid; | |
927 | new_euid = old_euid = current->euid; | |
928 | old_suid = current->suid; | |
929 | ||
930 | if (ruid != (uid_t) -1) { | |
931 | new_ruid = ruid; | |
932 | if ((old_ruid != ruid) && | |
933 | (current->euid != ruid) && | |
934 | !capable(CAP_SETUID)) | |
935 | return -EPERM; | |
936 | } | |
937 | ||
938 | if (euid != (uid_t) -1) { | |
939 | new_euid = euid; | |
940 | if ((old_ruid != euid) && | |
941 | (current->euid != euid) && | |
942 | (current->suid != euid) && | |
943 | !capable(CAP_SETUID)) | |
944 | return -EPERM; | |
945 | } | |
946 | ||
947 | if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) | |
948 | return -EAGAIN; | |
949 | ||
756184b7 | 950 | if (new_euid != old_euid) { |
d6e71144 | 951 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 952 | smp_wmb(); |
1da177e4 LT |
953 | } |
954 | current->fsuid = current->euid = new_euid; | |
955 | if (ruid != (uid_t) -1 || | |
956 | (euid != (uid_t) -1 && euid != old_ruid)) | |
957 | current->suid = current->euid; | |
958 | current->fsuid = current->euid; | |
959 | ||
960 | key_fsuid_changed(current); | |
9f46080c | 961 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
962 | |
963 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); | |
964 | } | |
965 | ||
966 | ||
967 | ||
968 | /* | |
969 | * setuid() is implemented like SysV with SAVED_IDS | |
970 | * | |
971 | * Note that SAVED_ID's is deficient in that a setuid root program | |
972 | * like sendmail, for example, cannot set its uid to be a normal | |
973 | * user and then switch back, because if you're root, setuid() sets | |
974 | * the saved uid too. If you don't like this, blame the bright people | |
975 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
976 | * will allow a root program to temporarily drop privileges and be able to | |
977 | * regain them by swapping the real and effective uid. | |
978 | */ | |
979 | asmlinkage long sys_setuid(uid_t uid) | |
980 | { | |
981 | int old_euid = current->euid; | |
982 | int old_ruid, old_suid, new_ruid, new_suid; | |
983 | int retval; | |
984 | ||
985 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); | |
986 | if (retval) | |
987 | return retval; | |
988 | ||
989 | old_ruid = new_ruid = current->uid; | |
990 | old_suid = current->suid; | |
991 | new_suid = old_suid; | |
992 | ||
993 | if (capable(CAP_SETUID)) { | |
994 | if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) | |
995 | return -EAGAIN; | |
996 | new_suid = uid; | |
997 | } else if ((uid != current->uid) && (uid != new_suid)) | |
998 | return -EPERM; | |
999 | ||
756184b7 | 1000 | if (old_euid != uid) { |
d6e71144 | 1001 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 1002 | smp_wmb(); |
1da177e4 LT |
1003 | } |
1004 | current->fsuid = current->euid = uid; | |
1005 | current->suid = new_suid; | |
1006 | ||
1007 | key_fsuid_changed(current); | |
9f46080c | 1008 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
1009 | |
1010 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); | |
1011 | } | |
1012 | ||
1013 | ||
1014 | /* | |
1015 | * This function implements a generic ability to update ruid, euid, | |
1016 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
1017 | */ | |
1018 | asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) | |
1019 | { | |
1020 | int old_ruid = current->uid; | |
1021 | int old_euid = current->euid; | |
1022 | int old_suid = current->suid; | |
1023 | int retval; | |
1024 | ||
1025 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); | |
1026 | if (retval) | |
1027 | return retval; | |
1028 | ||
1029 | if (!capable(CAP_SETUID)) { | |
1030 | if ((ruid != (uid_t) -1) && (ruid != current->uid) && | |
1031 | (ruid != current->euid) && (ruid != current->suid)) | |
1032 | return -EPERM; | |
1033 | if ((euid != (uid_t) -1) && (euid != current->uid) && | |
1034 | (euid != current->euid) && (euid != current->suid)) | |
1035 | return -EPERM; | |
1036 | if ((suid != (uid_t) -1) && (suid != current->uid) && | |
1037 | (suid != current->euid) && (suid != current->suid)) | |
1038 | return -EPERM; | |
1039 | } | |
1040 | if (ruid != (uid_t) -1) { | |
1041 | if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0) | |
1042 | return -EAGAIN; | |
1043 | } | |
1044 | if (euid != (uid_t) -1) { | |
756184b7 | 1045 | if (euid != current->euid) { |
d6e71144 | 1046 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 1047 | smp_wmb(); |
1da177e4 LT |
1048 | } |
1049 | current->euid = euid; | |
1050 | } | |
1051 | current->fsuid = current->euid; | |
1052 | if (suid != (uid_t) -1) | |
1053 | current->suid = suid; | |
1054 | ||
1055 | key_fsuid_changed(current); | |
9f46080c | 1056 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
1057 | |
1058 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); | |
1059 | } | |
1060 | ||
1061 | asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) | |
1062 | { | |
1063 | int retval; | |
1064 | ||
1065 | if (!(retval = put_user(current->uid, ruid)) && | |
1066 | !(retval = put_user(current->euid, euid))) | |
1067 | retval = put_user(current->suid, suid); | |
1068 | ||
1069 | return retval; | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Same as above, but for rgid, egid, sgid. | |
1074 | */ | |
1075 | asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) | |
1076 | { | |
1077 | int retval; | |
1078 | ||
1079 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); | |
1080 | if (retval) | |
1081 | return retval; | |
1082 | ||
1083 | if (!capable(CAP_SETGID)) { | |
1084 | if ((rgid != (gid_t) -1) && (rgid != current->gid) && | |
1085 | (rgid != current->egid) && (rgid != current->sgid)) | |
1086 | return -EPERM; | |
1087 | if ((egid != (gid_t) -1) && (egid != current->gid) && | |
1088 | (egid != current->egid) && (egid != current->sgid)) | |
1089 | return -EPERM; | |
1090 | if ((sgid != (gid_t) -1) && (sgid != current->gid) && | |
1091 | (sgid != current->egid) && (sgid != current->sgid)) | |
1092 | return -EPERM; | |
1093 | } | |
1094 | if (egid != (gid_t) -1) { | |
756184b7 | 1095 | if (egid != current->egid) { |
d6e71144 | 1096 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 1097 | smp_wmb(); |
1da177e4 LT |
1098 | } |
1099 | current->egid = egid; | |
1100 | } | |
1101 | current->fsgid = current->egid; | |
1102 | if (rgid != (gid_t) -1) | |
1103 | current->gid = rgid; | |
1104 | if (sgid != (gid_t) -1) | |
1105 | current->sgid = sgid; | |
1106 | ||
1107 | key_fsgid_changed(current); | |
9f46080c | 1108 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) | |
1113 | { | |
1114 | int retval; | |
1115 | ||
1116 | if (!(retval = put_user(current->gid, rgid)) && | |
1117 | !(retval = put_user(current->egid, egid))) | |
1118 | retval = put_user(current->sgid, sgid); | |
1119 | ||
1120 | return retval; | |
1121 | } | |
1122 | ||
1123 | ||
1124 | /* | |
1125 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
1126 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
1127 | * whatever uid it wants to). It normally shadows "euid", except when | |
1128 | * explicitly set by setfsuid() or for access.. | |
1129 | */ | |
1130 | asmlinkage long sys_setfsuid(uid_t uid) | |
1131 | { | |
1132 | int old_fsuid; | |
1133 | ||
1134 | old_fsuid = current->fsuid; | |
1135 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) | |
1136 | return old_fsuid; | |
1137 | ||
1138 | if (uid == current->uid || uid == current->euid || | |
1139 | uid == current->suid || uid == current->fsuid || | |
756184b7 CP |
1140 | capable(CAP_SETUID)) { |
1141 | if (uid != old_fsuid) { | |
d6e71144 | 1142 | current->mm->dumpable = suid_dumpable; |
d59dd462 | 1143 | smp_wmb(); |
1da177e4 LT |
1144 | } |
1145 | current->fsuid = uid; | |
1146 | } | |
1147 | ||
1148 | key_fsuid_changed(current); | |
9f46080c | 1149 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
1150 | |
1151 | security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); | |
1152 | ||
1153 | return old_fsuid; | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 |