Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
9984de1a | 7 | #include <linux/export.h> |
1da177e4 LT |
8 | #include <linux/mm.h> |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
1da177e4 LT |
11 | #include <linux/reboot.h> |
12 | #include <linux/prctl.h> | |
1da177e4 LT |
13 | #include <linux/highuid.h> |
14 | #include <linux/fs.h> | |
74da1ff7 | 15 | #include <linux/kmod.h> |
cdd6c482 | 16 | #include <linux/perf_event.h> |
3e88c553 | 17 | #include <linux/resource.h> |
dc009d92 EB |
18 | #include <linux/kernel.h> |
19 | #include <linux/kexec.h> | |
1da177e4 | 20 | #include <linux/workqueue.h> |
c59ede7b | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/device.h> |
23 | #include <linux/key.h> | |
24 | #include <linux/times.h> | |
25 | #include <linux/posix-timers.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/dcookies.h> | |
28 | #include <linux/suspend.h> | |
29 | #include <linux/tty.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
9f46080c | 31 | #include <linux/cn_proc.h> |
3cfc348b | 32 | #include <linux/getcpu.h> |
6eaeeaba | 33 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 34 | #include <linux/seccomp.h> |
4047727e | 35 | #include <linux/cpu.h> |
e28cbf22 | 36 | #include <linux/personality.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
5ad4e53b | 38 | #include <linux/fs_struct.h> |
5a0e3ad6 | 39 | #include <linux/gfp.h> |
40dc166c | 40 | #include <linux/syscore_ops.h> |
be27425d AK |
41 | #include <linux/version.h> |
42 | #include <linux/ctype.h> | |
1da177e4 LT |
43 | |
44 | #include <linux/compat.h> | |
45 | #include <linux/syscalls.h> | |
00d7c05a | 46 | #include <linux/kprobes.h> |
acce292c | 47 | #include <linux/user_namespace.h> |
1da177e4 | 48 | |
04c6862c | 49 | #include <linux/kmsg_dump.h> |
be27425d AK |
50 | /* Move somewhere else to avoid recompiling? */ |
51 | #include <generated/utsrelease.h> | |
04c6862c | 52 | |
1da177e4 LT |
53 | #include <asm/uaccess.h> |
54 | #include <asm/io.h> | |
55 | #include <asm/unistd.h> | |
56 | ||
57 | #ifndef SET_UNALIGN_CTL | |
58 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
59 | #endif | |
60 | #ifndef GET_UNALIGN_CTL | |
61 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
62 | #endif | |
63 | #ifndef SET_FPEMU_CTL | |
64 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
65 | #endif | |
66 | #ifndef GET_FPEMU_CTL | |
67 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
68 | #endif | |
69 | #ifndef SET_FPEXC_CTL | |
70 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
71 | #endif | |
72 | #ifndef GET_FPEXC_CTL | |
73 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
74 | #endif | |
651d765d AB |
75 | #ifndef GET_ENDIAN |
76 | # define GET_ENDIAN(a,b) (-EINVAL) | |
77 | #endif | |
78 | #ifndef SET_ENDIAN | |
79 | # define SET_ENDIAN(a,b) (-EINVAL) | |
80 | #endif | |
8fb402bc EB |
81 | #ifndef GET_TSC_CTL |
82 | # define GET_TSC_CTL(a) (-EINVAL) | |
83 | #endif | |
84 | #ifndef SET_TSC_CTL | |
85 | # define SET_TSC_CTL(a) (-EINVAL) | |
86 | #endif | |
1da177e4 LT |
87 | |
88 | /* | |
89 | * this is where the system-wide overflow UID and GID are defined, for | |
90 | * architectures that now have 32-bit UID/GID but didn't in the past | |
91 | */ | |
92 | ||
93 | int overflowuid = DEFAULT_OVERFLOWUID; | |
94 | int overflowgid = DEFAULT_OVERFLOWGID; | |
95 | ||
1da177e4 LT |
96 | EXPORT_SYMBOL(overflowuid); |
97 | EXPORT_SYMBOL(overflowgid); | |
1da177e4 LT |
98 | |
99 | /* | |
100 | * the same as above, but for filesystems which can only store a 16-bit | |
101 | * UID and GID. as such, this is needed on all architectures | |
102 | */ | |
103 | ||
104 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
105 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
106 | ||
107 | EXPORT_SYMBOL(fs_overflowuid); | |
108 | EXPORT_SYMBOL(fs_overflowgid); | |
109 | ||
110 | /* | |
111 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
112 | */ | |
113 | ||
114 | int C_A_D = 1; | |
9ec52099 CLG |
115 | struct pid *cad_pid; |
116 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 117 | |
bd804eba RW |
118 | /* |
119 | * If set, this is used for preparing the system to power off. | |
120 | */ | |
121 | ||
122 | void (*pm_power_off_prepare)(void); | |
bd804eba | 123 | |
fc832ad3 SH |
124 | /* |
125 | * Returns true if current's euid is same as p's uid or euid, | |
126 | * or has CAP_SYS_NICE to p's user_ns. | |
127 | * | |
128 | * Called with rcu_read_lock, creds are safe | |
129 | */ | |
130 | static bool set_one_prio_perm(struct task_struct *p) | |
131 | { | |
132 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
133 | ||
c4a4d603 | 134 | if (pcred->user_ns == cred->user_ns && |
fc832ad3 SH |
135 | (pcred->uid == cred->euid || |
136 | pcred->euid == cred->euid)) | |
137 | return true; | |
c4a4d603 | 138 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
fc832ad3 SH |
139 | return true; |
140 | return false; | |
141 | } | |
142 | ||
c69e8d9c DH |
143 | /* |
144 | * set the priority of a task | |
145 | * - the caller must hold the RCU read lock | |
146 | */ | |
1da177e4 LT |
147 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
148 | { | |
149 | int no_nice; | |
150 | ||
fc832ad3 | 151 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
152 | error = -EPERM; |
153 | goto out; | |
154 | } | |
e43379f1 | 155 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
156 | error = -EACCES; |
157 | goto out; | |
158 | } | |
159 | no_nice = security_task_setnice(p, niceval); | |
160 | if (no_nice) { | |
161 | error = no_nice; | |
162 | goto out; | |
163 | } | |
164 | if (error == -ESRCH) | |
165 | error = 0; | |
166 | set_user_nice(p, niceval); | |
167 | out: | |
168 | return error; | |
169 | } | |
170 | ||
754fe8d2 | 171 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
172 | { |
173 | struct task_struct *g, *p; | |
174 | struct user_struct *user; | |
86a264ab | 175 | const struct cred *cred = current_cred(); |
1da177e4 | 176 | int error = -EINVAL; |
41487c65 | 177 | struct pid *pgrp; |
7b44ab97 EB |
178 | kuid_t cred_uid; |
179 | kuid_t uid; | |
1da177e4 | 180 | |
3e88c553 | 181 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
182 | goto out; |
183 | ||
184 | /* normalize: avoid signed division (rounding problems) */ | |
185 | error = -ESRCH; | |
186 | if (niceval < -20) | |
187 | niceval = -20; | |
188 | if (niceval > 19) | |
189 | niceval = 19; | |
190 | ||
d4581a23 | 191 | rcu_read_lock(); |
1da177e4 LT |
192 | read_lock(&tasklist_lock); |
193 | switch (which) { | |
194 | case PRIO_PROCESS: | |
41487c65 | 195 | if (who) |
228ebcbe | 196 | p = find_task_by_vpid(who); |
41487c65 EB |
197 | else |
198 | p = current; | |
1da177e4 LT |
199 | if (p) |
200 | error = set_one_prio(p, niceval, error); | |
201 | break; | |
202 | case PRIO_PGRP: | |
41487c65 | 203 | if (who) |
b488893a | 204 | pgrp = find_vpid(who); |
41487c65 EB |
205 | else |
206 | pgrp = task_pgrp(current); | |
2d70b68d | 207 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 208 | error = set_one_prio(p, niceval, error); |
2d70b68d | 209 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
210 | break; |
211 | case PRIO_USER: | |
7b44ab97 EB |
212 | cred_uid = make_kuid(cred->user_ns, cred->uid); |
213 | uid = make_kuid(cred->user_ns, who); | |
74ba508f | 214 | user = cred->user; |
1da177e4 | 215 | if (!who) |
7b44ab97 EB |
216 | uid = cred_uid; |
217 | else if (!uid_eq(uid, cred_uid) && | |
218 | !(user = find_user(uid))) | |
86a264ab | 219 | goto out_unlock; /* No processes for this user */ |
1da177e4 | 220 | |
dfc6a736 | 221 | do_each_thread(g, p) { |
7b44ab97 EB |
222 | const struct cred *tcred = __task_cred(p); |
223 | kuid_t tcred_uid = make_kuid(tcred->user_ns, tcred->uid); | |
224 | if (uid_eq(tcred_uid, uid)) | |
1da177e4 | 225 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 226 | } while_each_thread(g, p); |
7b44ab97 | 227 | if (!uid_eq(uid, cred_uid)) |
1da177e4 LT |
228 | free_uid(user); /* For find_user() */ |
229 | break; | |
230 | } | |
231 | out_unlock: | |
232 | read_unlock(&tasklist_lock); | |
d4581a23 | 233 | rcu_read_unlock(); |
1da177e4 LT |
234 | out: |
235 | return error; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Ugh. To avoid negative return values, "getpriority()" will | |
240 | * not return the normal nice-value, but a negated value that | |
241 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
242 | * to stay compatible. | |
243 | */ | |
754fe8d2 | 244 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
245 | { |
246 | struct task_struct *g, *p; | |
247 | struct user_struct *user; | |
86a264ab | 248 | const struct cred *cred = current_cred(); |
1da177e4 | 249 | long niceval, retval = -ESRCH; |
41487c65 | 250 | struct pid *pgrp; |
7b44ab97 EB |
251 | kuid_t cred_uid; |
252 | kuid_t uid; | |
1da177e4 | 253 | |
3e88c553 | 254 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
255 | return -EINVAL; |
256 | ||
70118837 | 257 | rcu_read_lock(); |
1da177e4 LT |
258 | read_lock(&tasklist_lock); |
259 | switch (which) { | |
260 | case PRIO_PROCESS: | |
41487c65 | 261 | if (who) |
228ebcbe | 262 | p = find_task_by_vpid(who); |
41487c65 EB |
263 | else |
264 | p = current; | |
1da177e4 LT |
265 | if (p) { |
266 | niceval = 20 - task_nice(p); | |
267 | if (niceval > retval) | |
268 | retval = niceval; | |
269 | } | |
270 | break; | |
271 | case PRIO_PGRP: | |
41487c65 | 272 | if (who) |
b488893a | 273 | pgrp = find_vpid(who); |
41487c65 EB |
274 | else |
275 | pgrp = task_pgrp(current); | |
2d70b68d | 276 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
277 | niceval = 20 - task_nice(p); |
278 | if (niceval > retval) | |
279 | retval = niceval; | |
2d70b68d | 280 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
281 | break; |
282 | case PRIO_USER: | |
7b44ab97 EB |
283 | cred_uid = make_kuid(cred->user_ns, cred->uid); |
284 | uid = make_kuid(cred->user_ns, who); | |
74ba508f | 285 | user = cred->user; |
1da177e4 | 286 | if (!who) |
7b44ab97 EB |
287 | uid = cred_uid; |
288 | else if (!uid_eq(uid, cred_uid) && | |
289 | !(user = find_user(uid))) | |
86a264ab | 290 | goto out_unlock; /* No processes for this user */ |
1da177e4 | 291 | |
dfc6a736 | 292 | do_each_thread(g, p) { |
7b44ab97 EB |
293 | const struct cred *tcred = __task_cred(p); |
294 | kuid_t tcred_uid = make_kuid(tcred->user_ns, tcred->uid); | |
295 | if (uid_eq(tcred_uid, uid)) { | |
1da177e4 LT |
296 | niceval = 20 - task_nice(p); |
297 | if (niceval > retval) | |
298 | retval = niceval; | |
299 | } | |
dfc6a736 | 300 | } while_each_thread(g, p); |
7b44ab97 | 301 | if (!uid_eq(uid, cred_uid)) |
1da177e4 LT |
302 | free_uid(user); /* for find_user() */ |
303 | break; | |
304 | } | |
305 | out_unlock: | |
306 | read_unlock(&tasklist_lock); | |
70118837 | 307 | rcu_read_unlock(); |
1da177e4 LT |
308 | |
309 | return retval; | |
310 | } | |
311 | ||
e4c94330 EB |
312 | /** |
313 | * emergency_restart - reboot the system | |
314 | * | |
315 | * Without shutting down any hardware or taking any locks | |
316 | * reboot the system. This is called when we know we are in | |
317 | * trouble so this is our best effort to reboot. This is | |
318 | * safe to call in interrupt context. | |
319 | */ | |
7c903473 EB |
320 | void emergency_restart(void) |
321 | { | |
04c6862c | 322 | kmsg_dump(KMSG_DUMP_EMERG); |
7c903473 EB |
323 | machine_emergency_restart(); |
324 | } | |
325 | EXPORT_SYMBOL_GPL(emergency_restart); | |
326 | ||
ca195b7f | 327 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 328 | { |
e041c683 | 329 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 330 | system_state = SYSTEM_RESTART; |
b50fa7c8 | 331 | usermodehelper_disable(); |
4a00ea1e | 332 | device_shutdown(); |
40dc166c | 333 | syscore_shutdown(); |
e4c94330 | 334 | } |
1e5d5331 | 335 | |
c5f41752 AW |
336 | /** |
337 | * register_reboot_notifier - Register function to be called at reboot time | |
338 | * @nb: Info about notifier function to be called | |
339 | * | |
340 | * Registers a function with the list of functions | |
341 | * to be called at reboot time. | |
342 | * | |
343 | * Currently always returns zero, as blocking_notifier_chain_register() | |
344 | * always returns zero. | |
345 | */ | |
346 | int register_reboot_notifier(struct notifier_block *nb) | |
347 | { | |
348 | return blocking_notifier_chain_register(&reboot_notifier_list, nb); | |
349 | } | |
350 | EXPORT_SYMBOL(register_reboot_notifier); | |
351 | ||
352 | /** | |
353 | * unregister_reboot_notifier - Unregister previously registered reboot notifier | |
354 | * @nb: Hook to be unregistered | |
355 | * | |
356 | * Unregisters a previously registered reboot | |
357 | * notifier function. | |
358 | * | |
359 | * Returns zero on success, or %-ENOENT on failure. | |
360 | */ | |
361 | int unregister_reboot_notifier(struct notifier_block *nb) | |
362 | { | |
363 | return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); | |
364 | } | |
365 | EXPORT_SYMBOL(unregister_reboot_notifier); | |
366 | ||
1e5d5331 RD |
367 | /** |
368 | * kernel_restart - reboot the system | |
369 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 370 | * or %NULL |
1e5d5331 RD |
371 | * |
372 | * Shutdown everything and perform a clean reboot. | |
373 | * This is not safe to call in interrupt context. | |
374 | */ | |
e4c94330 EB |
375 | void kernel_restart(char *cmd) |
376 | { | |
377 | kernel_restart_prepare(cmd); | |
756184b7 | 378 | if (!cmd) |
4a00ea1e | 379 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 380 | else |
4a00ea1e | 381 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
04c6862c | 382 | kmsg_dump(KMSG_DUMP_RESTART); |
4a00ea1e EB |
383 | machine_restart(cmd); |
384 | } | |
385 | EXPORT_SYMBOL_GPL(kernel_restart); | |
386 | ||
4ef7229f | 387 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 388 | { |
e041c683 | 389 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
390 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
391 | system_state = state; | |
b50fa7c8 | 392 | usermodehelper_disable(); |
729b4d4c AS |
393 | device_shutdown(); |
394 | } | |
e4c94330 EB |
395 | /** |
396 | * kernel_halt - halt the system | |
397 | * | |
398 | * Shutdown everything and perform a clean system halt. | |
399 | */ | |
e4c94330 EB |
400 | void kernel_halt(void) |
401 | { | |
729b4d4c | 402 | kernel_shutdown_prepare(SYSTEM_HALT); |
40dc166c | 403 | syscore_shutdown(); |
4a00ea1e | 404 | printk(KERN_EMERG "System halted.\n"); |
04c6862c | 405 | kmsg_dump(KMSG_DUMP_HALT); |
4a00ea1e EB |
406 | machine_halt(); |
407 | } | |
729b4d4c | 408 | |
4a00ea1e EB |
409 | EXPORT_SYMBOL_GPL(kernel_halt); |
410 | ||
e4c94330 EB |
411 | /** |
412 | * kernel_power_off - power_off the system | |
413 | * | |
414 | * Shutdown everything and perform a clean system power_off. | |
415 | */ | |
e4c94330 EB |
416 | void kernel_power_off(void) |
417 | { | |
729b4d4c | 418 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
419 | if (pm_power_off_prepare) |
420 | pm_power_off_prepare(); | |
4047727e | 421 | disable_nonboot_cpus(); |
40dc166c | 422 | syscore_shutdown(); |
4a00ea1e | 423 | printk(KERN_EMERG "Power down.\n"); |
04c6862c | 424 | kmsg_dump(KMSG_DUMP_POWEROFF); |
4a00ea1e EB |
425 | machine_power_off(); |
426 | } | |
427 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
428 | |
429 | static DEFINE_MUTEX(reboot_mutex); | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Reboot system call: for obvious reasons only root may call it, | |
433 | * and even root needs to set up some magic numbers in the registers | |
434 | * so that some mistake won't make this reboot the whole machine. | |
435 | * You can also set the meaning of the ctrl-alt-del-key here. | |
436 | * | |
437 | * reboot doesn't sync: do that yourself before calling this. | |
438 | */ | |
754fe8d2 HC |
439 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
440 | void __user *, arg) | |
1da177e4 LT |
441 | { |
442 | char buffer[256]; | |
3d26dcf7 | 443 | int ret = 0; |
1da177e4 LT |
444 | |
445 | /* We only trust the superuser with rebooting the system. */ | |
446 | if (!capable(CAP_SYS_BOOT)) | |
447 | return -EPERM; | |
448 | ||
449 | /* For safety, we require "magic" arguments. */ | |
450 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
451 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
452 | magic2 != LINUX_REBOOT_MAGIC2A && | |
453 | magic2 != LINUX_REBOOT_MAGIC2B && | |
454 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
455 | return -EINVAL; | |
456 | ||
cf3f8921 DL |
457 | /* |
458 | * If pid namespaces are enabled and the current task is in a child | |
459 | * pid_namespace, the command is handled by reboot_pid_ns() which will | |
460 | * call do_exit(). | |
461 | */ | |
462 | ret = reboot_pid_ns(task_active_pid_ns(current), cmd); | |
463 | if (ret) | |
464 | return ret; | |
465 | ||
5e38291d EB |
466 | /* Instead of trying to make the power_off code look like |
467 | * halt when pm_power_off is not set do it the easy way. | |
468 | */ | |
469 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
470 | cmd = LINUX_REBOOT_CMD_HALT; | |
471 | ||
6f15fa50 | 472 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
473 | switch (cmd) { |
474 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 475 | kernel_restart(NULL); |
1da177e4 LT |
476 | break; |
477 | ||
478 | case LINUX_REBOOT_CMD_CAD_ON: | |
479 | C_A_D = 1; | |
480 | break; | |
481 | ||
482 | case LINUX_REBOOT_CMD_CAD_OFF: | |
483 | C_A_D = 0; | |
484 | break; | |
485 | ||
486 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 487 | kernel_halt(); |
1da177e4 | 488 | do_exit(0); |
3d26dcf7 | 489 | panic("cannot halt"); |
1da177e4 LT |
490 | |
491 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 492 | kernel_power_off(); |
1da177e4 LT |
493 | do_exit(0); |
494 | break; | |
495 | ||
496 | case LINUX_REBOOT_CMD_RESTART2: | |
497 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
498 | ret = -EFAULT; |
499 | break; | |
1da177e4 LT |
500 | } |
501 | buffer[sizeof(buffer) - 1] = '\0'; | |
502 | ||
4a00ea1e | 503 | kernel_restart(buffer); |
1da177e4 LT |
504 | break; |
505 | ||
3ab83521 | 506 | #ifdef CONFIG_KEXEC |
dc009d92 | 507 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
508 | ret = kernel_kexec(); |
509 | break; | |
3ab83521 | 510 | #endif |
4a00ea1e | 511 | |
b0cb1a19 | 512 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 513 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
514 | ret = hibernate(); |
515 | break; | |
1da177e4 LT |
516 | #endif |
517 | ||
518 | default: | |
3d26dcf7 AK |
519 | ret = -EINVAL; |
520 | break; | |
1da177e4 | 521 | } |
6f15fa50 | 522 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 523 | return ret; |
1da177e4 LT |
524 | } |
525 | ||
65f27f38 | 526 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 527 | { |
abcd9e51 | 528 | kernel_restart(NULL); |
1da177e4 LT |
529 | } |
530 | ||
531 | /* | |
532 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
533 | * As it's called within an interrupt, it may NOT sync: the only choice | |
534 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
535 | */ | |
536 | void ctrl_alt_del(void) | |
537 | { | |
65f27f38 | 538 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
539 | |
540 | if (C_A_D) | |
541 | schedule_work(&cad_work); | |
542 | else | |
9ec52099 | 543 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
544 | } |
545 | ||
1da177e4 LT |
546 | /* |
547 | * Unprivileged users may change the real gid to the effective gid | |
548 | * or vice versa. (BSD-style) | |
549 | * | |
550 | * If you set the real gid at all, or set the effective gid to a value not | |
551 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
552 | * | |
553 | * This makes it possible for a setgid program to completely drop its | |
554 | * privileges, which is often a useful assertion to make when you are doing | |
555 | * a security audit over a program. | |
556 | * | |
557 | * The general idea is that a program which uses just setregid() will be | |
558 | * 100% compatible with BSD. A program which uses just setgid() will be | |
559 | * 100% compatible with POSIX with saved IDs. | |
560 | * | |
561 | * SMP: There are not races, the GIDs are checked only by filesystem | |
562 | * operations (as far as semantic preservation is concerned). | |
563 | */ | |
ae1251ab | 564 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 565 | { |
d84f4f99 DH |
566 | const struct cred *old; |
567 | struct cred *new; | |
1da177e4 LT |
568 | int retval; |
569 | ||
d84f4f99 DH |
570 | new = prepare_creds(); |
571 | if (!new) | |
572 | return -ENOMEM; | |
573 | old = current_cred(); | |
574 | ||
d84f4f99 | 575 | retval = -EPERM; |
1da177e4 | 576 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
577 | if (old->gid == rgid || |
578 | old->egid == rgid || | |
fc832ad3 | 579 | nsown_capable(CAP_SETGID)) |
d84f4f99 | 580 | new->gid = rgid; |
1da177e4 | 581 | else |
d84f4f99 | 582 | goto error; |
1da177e4 LT |
583 | } |
584 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
585 | if (old->gid == egid || |
586 | old->egid == egid || | |
587 | old->sgid == egid || | |
fc832ad3 | 588 | nsown_capable(CAP_SETGID)) |
d84f4f99 | 589 | new->egid = egid; |
756184b7 | 590 | else |
d84f4f99 | 591 | goto error; |
1da177e4 | 592 | } |
d84f4f99 | 593 | |
1da177e4 | 594 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
595 | (egid != (gid_t) -1 && egid != old->gid)) |
596 | new->sgid = new->egid; | |
597 | new->fsgid = new->egid; | |
598 | ||
599 | return commit_creds(new); | |
600 | ||
601 | error: | |
602 | abort_creds(new); | |
603 | return retval; | |
1da177e4 LT |
604 | } |
605 | ||
606 | /* | |
607 | * setgid() is implemented like SysV w/ SAVED_IDS | |
608 | * | |
609 | * SMP: Same implicit races as above. | |
610 | */ | |
ae1251ab | 611 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 612 | { |
d84f4f99 DH |
613 | const struct cred *old; |
614 | struct cred *new; | |
1da177e4 LT |
615 | int retval; |
616 | ||
d84f4f99 DH |
617 | new = prepare_creds(); |
618 | if (!new) | |
619 | return -ENOMEM; | |
620 | old = current_cred(); | |
621 | ||
d84f4f99 | 622 | retval = -EPERM; |
fc832ad3 | 623 | if (nsown_capable(CAP_SETGID)) |
d84f4f99 DH |
624 | new->gid = new->egid = new->sgid = new->fsgid = gid; |
625 | else if (gid == old->gid || gid == old->sgid) | |
626 | new->egid = new->fsgid = gid; | |
1da177e4 | 627 | else |
d84f4f99 | 628 | goto error; |
1da177e4 | 629 | |
d84f4f99 DH |
630 | return commit_creds(new); |
631 | ||
632 | error: | |
633 | abort_creds(new); | |
634 | return retval; | |
1da177e4 | 635 | } |
54e99124 | 636 | |
d84f4f99 DH |
637 | /* |
638 | * change the user struct in a credentials set to match the new UID | |
639 | */ | |
640 | static int set_user(struct cred *new) | |
1da177e4 LT |
641 | { |
642 | struct user_struct *new_user; | |
643 | ||
7b44ab97 | 644 | new_user = alloc_uid(make_kuid(new->user_ns, new->uid)); |
1da177e4 LT |
645 | if (!new_user) |
646 | return -EAGAIN; | |
647 | ||
72fa5997 VK |
648 | /* |
649 | * We don't fail in case of NPROC limit excess here because too many | |
650 | * poorly written programs don't check set*uid() return code, assuming | |
651 | * it never fails if called by root. We may still enforce NPROC limit | |
652 | * for programs doing set*uid()+execve() by harmlessly deferring the | |
653 | * failure to the execve() stage. | |
654 | */ | |
78d7d407 | 655 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa5997 VK |
656 | new_user != INIT_USER) |
657 | current->flags |= PF_NPROC_EXCEEDED; | |
658 | else | |
659 | current->flags &= ~PF_NPROC_EXCEEDED; | |
1da177e4 | 660 | |
d84f4f99 DH |
661 | free_uid(new->user); |
662 | new->user = new_user; | |
1da177e4 LT |
663 | return 0; |
664 | } | |
665 | ||
666 | /* | |
667 | * Unprivileged users may change the real uid to the effective uid | |
668 | * or vice versa. (BSD-style) | |
669 | * | |
670 | * If you set the real uid at all, or set the effective uid to a value not | |
671 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
672 | * | |
673 | * This makes it possible for a setuid program to completely drop its | |
674 | * privileges, which is often a useful assertion to make when you are doing | |
675 | * a security audit over a program. | |
676 | * | |
677 | * The general idea is that a program which uses just setreuid() will be | |
678 | * 100% compatible with BSD. A program which uses just setuid() will be | |
679 | * 100% compatible with POSIX with saved IDs. | |
680 | */ | |
ae1251ab | 681 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 682 | { |
d84f4f99 DH |
683 | const struct cred *old; |
684 | struct cred *new; | |
1da177e4 LT |
685 | int retval; |
686 | ||
d84f4f99 DH |
687 | new = prepare_creds(); |
688 | if (!new) | |
689 | return -ENOMEM; | |
690 | old = current_cred(); | |
691 | ||
d84f4f99 | 692 | retval = -EPERM; |
1da177e4 | 693 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
694 | new->uid = ruid; |
695 | if (old->uid != ruid && | |
696 | old->euid != ruid && | |
fc832ad3 | 697 | !nsown_capable(CAP_SETUID)) |
d84f4f99 | 698 | goto error; |
1da177e4 LT |
699 | } |
700 | ||
701 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
702 | new->euid = euid; |
703 | if (old->uid != euid && | |
704 | old->euid != euid && | |
705 | old->suid != euid && | |
fc832ad3 | 706 | !nsown_capable(CAP_SETUID)) |
d84f4f99 | 707 | goto error; |
1da177e4 LT |
708 | } |
709 | ||
54e99124 DG |
710 | if (new->uid != old->uid) { |
711 | retval = set_user(new); | |
712 | if (retval < 0) | |
713 | goto error; | |
714 | } | |
1da177e4 | 715 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
716 | (euid != (uid_t) -1 && euid != old->uid)) |
717 | new->suid = new->euid; | |
718 | new->fsuid = new->euid; | |
1da177e4 | 719 | |
d84f4f99 DH |
720 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
721 | if (retval < 0) | |
722 | goto error; | |
1da177e4 | 723 | |
d84f4f99 | 724 | return commit_creds(new); |
1da177e4 | 725 | |
d84f4f99 DH |
726 | error: |
727 | abort_creds(new); | |
728 | return retval; | |
729 | } | |
1da177e4 LT |
730 | |
731 | /* | |
732 | * setuid() is implemented like SysV with SAVED_IDS | |
733 | * | |
734 | * Note that SAVED_ID's is deficient in that a setuid root program | |
735 | * like sendmail, for example, cannot set its uid to be a normal | |
736 | * user and then switch back, because if you're root, setuid() sets | |
737 | * the saved uid too. If you don't like this, blame the bright people | |
738 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
739 | * will allow a root program to temporarily drop privileges and be able to | |
740 | * regain them by swapping the real and effective uid. | |
741 | */ | |
ae1251ab | 742 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 743 | { |
d84f4f99 DH |
744 | const struct cred *old; |
745 | struct cred *new; | |
1da177e4 LT |
746 | int retval; |
747 | ||
d84f4f99 DH |
748 | new = prepare_creds(); |
749 | if (!new) | |
750 | return -ENOMEM; | |
751 | old = current_cred(); | |
752 | ||
d84f4f99 | 753 | retval = -EPERM; |
fc832ad3 | 754 | if (nsown_capable(CAP_SETUID)) { |
d84f4f99 | 755 | new->suid = new->uid = uid; |
54e99124 DG |
756 | if (uid != old->uid) { |
757 | retval = set_user(new); | |
758 | if (retval < 0) | |
759 | goto error; | |
d84f4f99 DH |
760 | } |
761 | } else if (uid != old->uid && uid != new->suid) { | |
762 | goto error; | |
1da177e4 | 763 | } |
1da177e4 | 764 | |
d84f4f99 DH |
765 | new->fsuid = new->euid = uid; |
766 | ||
767 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
768 | if (retval < 0) | |
769 | goto error; | |
1da177e4 | 770 | |
d84f4f99 | 771 | return commit_creds(new); |
1da177e4 | 772 | |
d84f4f99 DH |
773 | error: |
774 | abort_creds(new); | |
775 | return retval; | |
1da177e4 LT |
776 | } |
777 | ||
778 | ||
779 | /* | |
780 | * This function implements a generic ability to update ruid, euid, | |
781 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
782 | */ | |
ae1251ab | 783 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 784 | { |
d84f4f99 DH |
785 | const struct cred *old; |
786 | struct cred *new; | |
1da177e4 LT |
787 | int retval; |
788 | ||
d84f4f99 DH |
789 | new = prepare_creds(); |
790 | if (!new) | |
791 | return -ENOMEM; | |
792 | ||
d84f4f99 | 793 | old = current_cred(); |
1da177e4 | 794 | |
d84f4f99 | 795 | retval = -EPERM; |
fc832ad3 | 796 | if (!nsown_capable(CAP_SETUID)) { |
d84f4f99 DH |
797 | if (ruid != (uid_t) -1 && ruid != old->uid && |
798 | ruid != old->euid && ruid != old->suid) | |
799 | goto error; | |
800 | if (euid != (uid_t) -1 && euid != old->uid && | |
801 | euid != old->euid && euid != old->suid) | |
802 | goto error; | |
803 | if (suid != (uid_t) -1 && suid != old->uid && | |
804 | suid != old->euid && suid != old->suid) | |
805 | goto error; | |
1da177e4 | 806 | } |
d84f4f99 | 807 | |
1da177e4 | 808 | if (ruid != (uid_t) -1) { |
d84f4f99 | 809 | new->uid = ruid; |
54e99124 DG |
810 | if (ruid != old->uid) { |
811 | retval = set_user(new); | |
812 | if (retval < 0) | |
813 | goto error; | |
814 | } | |
1da177e4 | 815 | } |
d84f4f99 DH |
816 | if (euid != (uid_t) -1) |
817 | new->euid = euid; | |
1da177e4 | 818 | if (suid != (uid_t) -1) |
d84f4f99 DH |
819 | new->suid = suid; |
820 | new->fsuid = new->euid; | |
1da177e4 | 821 | |
d84f4f99 DH |
822 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
823 | if (retval < 0) | |
824 | goto error; | |
1da177e4 | 825 | |
d84f4f99 | 826 | return commit_creds(new); |
1da177e4 | 827 | |
d84f4f99 DH |
828 | error: |
829 | abort_creds(new); | |
830 | return retval; | |
1da177e4 LT |
831 | } |
832 | ||
dbf040d9 | 833 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 834 | { |
86a264ab | 835 | const struct cred *cred = current_cred(); |
1da177e4 LT |
836 | int retval; |
837 | ||
86a264ab DH |
838 | if (!(retval = put_user(cred->uid, ruid)) && |
839 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 840 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
841 | |
842 | return retval; | |
843 | } | |
844 | ||
845 | /* | |
846 | * Same as above, but for rgid, egid, sgid. | |
847 | */ | |
ae1251ab | 848 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 849 | { |
d84f4f99 DH |
850 | const struct cred *old; |
851 | struct cred *new; | |
1da177e4 LT |
852 | int retval; |
853 | ||
d84f4f99 DH |
854 | new = prepare_creds(); |
855 | if (!new) | |
856 | return -ENOMEM; | |
857 | old = current_cred(); | |
858 | ||
d84f4f99 | 859 | retval = -EPERM; |
fc832ad3 | 860 | if (!nsown_capable(CAP_SETGID)) { |
d84f4f99 DH |
861 | if (rgid != (gid_t) -1 && rgid != old->gid && |
862 | rgid != old->egid && rgid != old->sgid) | |
863 | goto error; | |
864 | if (egid != (gid_t) -1 && egid != old->gid && | |
865 | egid != old->egid && egid != old->sgid) | |
866 | goto error; | |
867 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
868 | sgid != old->egid && sgid != old->sgid) | |
869 | goto error; | |
1da177e4 | 870 | } |
d84f4f99 | 871 | |
1da177e4 | 872 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
873 | new->gid = rgid; |
874 | if (egid != (gid_t) -1) | |
875 | new->egid = egid; | |
1da177e4 | 876 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
877 | new->sgid = sgid; |
878 | new->fsgid = new->egid; | |
1da177e4 | 879 | |
d84f4f99 DH |
880 | return commit_creds(new); |
881 | ||
882 | error: | |
883 | abort_creds(new); | |
884 | return retval; | |
1da177e4 LT |
885 | } |
886 | ||
dbf040d9 | 887 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 888 | { |
86a264ab | 889 | const struct cred *cred = current_cred(); |
1da177e4 LT |
890 | int retval; |
891 | ||
86a264ab DH |
892 | if (!(retval = put_user(cred->gid, rgid)) && |
893 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 894 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
895 | |
896 | return retval; | |
897 | } | |
898 | ||
899 | ||
900 | /* | |
901 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
902 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
903 | * whatever uid it wants to). It normally shadows "euid", except when | |
904 | * explicitly set by setfsuid() or for access.. | |
905 | */ | |
ae1251ab | 906 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 907 | { |
d84f4f99 DH |
908 | const struct cred *old; |
909 | struct cred *new; | |
910 | uid_t old_fsuid; | |
1da177e4 | 911 | |
d84f4f99 DH |
912 | new = prepare_creds(); |
913 | if (!new) | |
914 | return current_fsuid(); | |
915 | old = current_cred(); | |
916 | old_fsuid = old->fsuid; | |
1da177e4 | 917 | |
d84f4f99 DH |
918 | if (uid == old->uid || uid == old->euid || |
919 | uid == old->suid || uid == old->fsuid || | |
fc832ad3 | 920 | nsown_capable(CAP_SETUID)) { |
756184b7 | 921 | if (uid != old_fsuid) { |
d84f4f99 DH |
922 | new->fsuid = uid; |
923 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
924 | goto change_okay; | |
1da177e4 | 925 | } |
1da177e4 LT |
926 | } |
927 | ||
d84f4f99 DH |
928 | abort_creds(new); |
929 | return old_fsuid; | |
1da177e4 | 930 | |
d84f4f99 DH |
931 | change_okay: |
932 | commit_creds(new); | |
1da177e4 LT |
933 | return old_fsuid; |
934 | } | |
935 | ||
936 | /* | |
f42df9e6 | 937 | * Samma på svenska.. |
1da177e4 | 938 | */ |
ae1251ab | 939 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 940 | { |
d84f4f99 DH |
941 | const struct cred *old; |
942 | struct cred *new; | |
943 | gid_t old_fsgid; | |
944 | ||
945 | new = prepare_creds(); | |
946 | if (!new) | |
947 | return current_fsgid(); | |
948 | old = current_cred(); | |
949 | old_fsgid = old->fsgid; | |
1da177e4 | 950 | |
d84f4f99 DH |
951 | if (gid == old->gid || gid == old->egid || |
952 | gid == old->sgid || gid == old->fsgid || | |
fc832ad3 | 953 | nsown_capable(CAP_SETGID)) { |
756184b7 | 954 | if (gid != old_fsgid) { |
d84f4f99 DH |
955 | new->fsgid = gid; |
956 | goto change_okay; | |
1da177e4 | 957 | } |
1da177e4 | 958 | } |
d84f4f99 | 959 | |
d84f4f99 DH |
960 | abort_creds(new); |
961 | return old_fsgid; | |
962 | ||
963 | change_okay: | |
964 | commit_creds(new); | |
1da177e4 LT |
965 | return old_fsgid; |
966 | } | |
967 | ||
f06febc9 FM |
968 | void do_sys_times(struct tms *tms) |
969 | { | |
0cf55e1e | 970 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 971 | |
2b5fe6de | 972 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 973 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
974 | cutime = current->signal->cutime; |
975 | cstime = current->signal->cstime; | |
976 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
977 | tms->tms_utime = cputime_to_clock_t(tgutime); |
978 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
979 | tms->tms_cutime = cputime_to_clock_t(cutime); |
980 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
981 | } | |
982 | ||
58fd3aa2 | 983 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 984 | { |
1da177e4 LT |
985 | if (tbuf) { |
986 | struct tms tmp; | |
f06febc9 FM |
987 | |
988 | do_sys_times(&tmp); | |
1da177e4 LT |
989 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
990 | return -EFAULT; | |
991 | } | |
e3d5a27d | 992 | force_successful_syscall_return(); |
1da177e4 LT |
993 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
994 | } | |
995 | ||
996 | /* | |
997 | * This needs some heavy checking ... | |
998 | * I just haven't the stomach for it. I also don't fully | |
999 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
1000 | * | |
1001 | * OK, I think I have the protection semantics right.... this is really | |
1002 | * only important on a multi-user system anyway, to make sure one user | |
1003 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
1004 | * | |
1005 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
1006 | * LBT 04.03.94 | |
1007 | */ | |
b290ebe2 | 1008 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
1009 | { |
1010 | struct task_struct *p; | |
ee0acf90 | 1011 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
1012 | struct pid *pgrp; |
1013 | int err; | |
1da177e4 LT |
1014 | |
1015 | if (!pid) | |
b488893a | 1016 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
1017 | if (!pgid) |
1018 | pgid = pid; | |
1019 | if (pgid < 0) | |
1020 | return -EINVAL; | |
950eaaca | 1021 | rcu_read_lock(); |
1da177e4 LT |
1022 | |
1023 | /* From this point forward we keep holding onto the tasklist lock | |
1024 | * so that our parent does not change from under us. -DaveM | |
1025 | */ | |
1026 | write_lock_irq(&tasklist_lock); | |
1027 | ||
1028 | err = -ESRCH; | |
4e021306 | 1029 | p = find_task_by_vpid(pid); |
1da177e4 LT |
1030 | if (!p) |
1031 | goto out; | |
1032 | ||
1033 | err = -EINVAL; | |
1034 | if (!thread_group_leader(p)) | |
1035 | goto out; | |
1036 | ||
4e021306 | 1037 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 1038 | err = -EPERM; |
41487c65 | 1039 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
1040 | goto out; |
1041 | err = -EACCES; | |
1042 | if (p->did_exec) | |
1043 | goto out; | |
1044 | } else { | |
1045 | err = -ESRCH; | |
ee0acf90 | 1046 | if (p != group_leader) |
1da177e4 LT |
1047 | goto out; |
1048 | } | |
1049 | ||
1050 | err = -EPERM; | |
1051 | if (p->signal->leader) | |
1052 | goto out; | |
1053 | ||
4e021306 | 1054 | pgrp = task_pid(p); |
1da177e4 | 1055 | if (pgid != pid) { |
b488893a | 1056 | struct task_struct *g; |
1da177e4 | 1057 | |
4e021306 ON |
1058 | pgrp = find_vpid(pgid); |
1059 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1060 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1061 | goto out; |
1da177e4 LT |
1062 | } |
1063 | ||
1da177e4 LT |
1064 | err = security_task_setpgid(p, pgid); |
1065 | if (err) | |
1066 | goto out; | |
1067 | ||
1b0f7ffd | 1068 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1069 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1070 | |
1071 | err = 0; | |
1072 | out: | |
1073 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1074 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 1075 | rcu_read_unlock(); |
1da177e4 LT |
1076 | return err; |
1077 | } | |
1078 | ||
dbf040d9 | 1079 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1080 | { |
12a3de0a ON |
1081 | struct task_struct *p; |
1082 | struct pid *grp; | |
1083 | int retval; | |
1084 | ||
1085 | rcu_read_lock(); | |
756184b7 | 1086 | if (!pid) |
12a3de0a | 1087 | grp = task_pgrp(current); |
756184b7 | 1088 | else { |
1da177e4 | 1089 | retval = -ESRCH; |
12a3de0a ON |
1090 | p = find_task_by_vpid(pid); |
1091 | if (!p) | |
1092 | goto out; | |
1093 | grp = task_pgrp(p); | |
1094 | if (!grp) | |
1095 | goto out; | |
1096 | ||
1097 | retval = security_task_getpgid(p); | |
1098 | if (retval) | |
1099 | goto out; | |
1da177e4 | 1100 | } |
12a3de0a ON |
1101 | retval = pid_vnr(grp); |
1102 | out: | |
1103 | rcu_read_unlock(); | |
1104 | return retval; | |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1108 | ||
dbf040d9 | 1109 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1110 | { |
12a3de0a | 1111 | return sys_getpgid(0); |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | #endif | |
1115 | ||
dbf040d9 | 1116 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1117 | { |
1dd768c0 ON |
1118 | struct task_struct *p; |
1119 | struct pid *sid; | |
1120 | int retval; | |
1121 | ||
1122 | rcu_read_lock(); | |
756184b7 | 1123 | if (!pid) |
1dd768c0 | 1124 | sid = task_session(current); |
756184b7 | 1125 | else { |
1da177e4 | 1126 | retval = -ESRCH; |
1dd768c0 ON |
1127 | p = find_task_by_vpid(pid); |
1128 | if (!p) | |
1129 | goto out; | |
1130 | sid = task_session(p); | |
1131 | if (!sid) | |
1132 | goto out; | |
1133 | ||
1134 | retval = security_task_getsid(p); | |
1135 | if (retval) | |
1136 | goto out; | |
1da177e4 | 1137 | } |
1dd768c0 ON |
1138 | retval = pid_vnr(sid); |
1139 | out: | |
1140 | rcu_read_unlock(); | |
1141 | return retval; | |
1da177e4 LT |
1142 | } |
1143 | ||
b290ebe2 | 1144 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1145 | { |
e19f247a | 1146 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1147 | struct pid *sid = task_pid(group_leader); |
1148 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1149 | int err = -EPERM; |
1150 | ||
1da177e4 | 1151 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1152 | /* Fail if I am already a session leader */ |
1153 | if (group_leader->signal->leader) | |
1154 | goto out; | |
1155 | ||
430c6231 ON |
1156 | /* Fail if a process group id already exists that equals the |
1157 | * proposed session id. | |
390e2ff0 | 1158 | */ |
6806aac6 | 1159 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1160 | goto out; |
1161 | ||
e19f247a | 1162 | group_leader->signal->leader = 1; |
8520d7c7 | 1163 | __set_special_pids(sid); |
24ec839c | 1164 | |
9c9f4ded | 1165 | proc_clear_tty(group_leader); |
24ec839c | 1166 | |
e4cc0a9c | 1167 | err = session; |
1da177e4 LT |
1168 | out: |
1169 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1170 | if (err > 0) { |
0d0df599 | 1171 | proc_sid_connector(group_leader); |
5091faa4 MG |
1172 | sched_autogroup_create_attach(group_leader); |
1173 | } | |
1da177e4 LT |
1174 | return err; |
1175 | } | |
1176 | ||
1da177e4 LT |
1177 | DECLARE_RWSEM(uts_sem); |
1178 | ||
e28cbf22 CH |
1179 | #ifdef COMPAT_UTS_MACHINE |
1180 | #define override_architecture(name) \ | |
46da2766 | 1181 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1182 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1183 | sizeof(COMPAT_UTS_MACHINE))) | |
1184 | #else | |
1185 | #define override_architecture(name) 0 | |
1186 | #endif | |
1187 | ||
be27425d AK |
1188 | /* |
1189 | * Work around broken programs that cannot handle "Linux 3.0". | |
1190 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 | |
1191 | */ | |
1192 | static int override_release(char __user *release, int len) | |
1193 | { | |
1194 | int ret = 0; | |
a84a79e4 | 1195 | char buf[65]; |
be27425d AK |
1196 | |
1197 | if (current->personality & UNAME26) { | |
1198 | char *rest = UTS_RELEASE; | |
1199 | int ndots = 0; | |
1200 | unsigned v; | |
1201 | ||
1202 | while (*rest) { | |
1203 | if (*rest == '.' && ++ndots >= 3) | |
1204 | break; | |
1205 | if (!isdigit(*rest) && *rest != '.') | |
1206 | break; | |
1207 | rest++; | |
1208 | } | |
1209 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40; | |
1210 | snprintf(buf, len, "2.6.%u%s", v, rest); | |
1211 | ret = copy_to_user(release, buf, len); | |
1212 | } | |
1213 | return ret; | |
1214 | } | |
1215 | ||
e48fbb69 | 1216 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1217 | { |
1218 | int errno = 0; | |
1219 | ||
1220 | down_read(&uts_sem); | |
e9ff3990 | 1221 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1222 | errno = -EFAULT; |
1223 | up_read(&uts_sem); | |
e28cbf22 | 1224 | |
be27425d AK |
1225 | if (!errno && override_release(name->release, sizeof(name->release))) |
1226 | errno = -EFAULT; | |
e28cbf22 CH |
1227 | if (!errno && override_architecture(name)) |
1228 | errno = -EFAULT; | |
1da177e4 LT |
1229 | return errno; |
1230 | } | |
1231 | ||
5cacdb4a CH |
1232 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1233 | /* | |
1234 | * Old cruft | |
1235 | */ | |
1236 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1237 | { | |
1238 | int error = 0; | |
1239 | ||
1240 | if (!name) | |
1241 | return -EFAULT; | |
1242 | ||
1243 | down_read(&uts_sem); | |
1244 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1245 | error = -EFAULT; | |
1246 | up_read(&uts_sem); | |
1247 | ||
be27425d AK |
1248 | if (!error && override_release(name->release, sizeof(name->release))) |
1249 | error = -EFAULT; | |
5cacdb4a CH |
1250 | if (!error && override_architecture(name)) |
1251 | error = -EFAULT; | |
1252 | return error; | |
1253 | } | |
1254 | ||
1255 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1256 | { | |
1257 | int error; | |
1258 | ||
1259 | if (!name) | |
1260 | return -EFAULT; | |
1261 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1262 | return -EFAULT; | |
1263 | ||
1264 | down_read(&uts_sem); | |
1265 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1266 | __OLD_UTS_LEN); | |
1267 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1268 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1269 | __OLD_UTS_LEN); | |
1270 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1271 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1272 | __OLD_UTS_LEN); | |
1273 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1274 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1275 | __OLD_UTS_LEN); | |
1276 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1277 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1278 | __OLD_UTS_LEN); | |
1279 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1280 | up_read(&uts_sem); | |
1281 | ||
1282 | if (!error && override_architecture(name)) | |
1283 | error = -EFAULT; | |
be27425d AK |
1284 | if (!error && override_release(name->release, sizeof(name->release))) |
1285 | error = -EFAULT; | |
5cacdb4a CH |
1286 | return error ? -EFAULT : 0; |
1287 | } | |
1288 | #endif | |
1289 | ||
5a8a82b1 | 1290 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1291 | { |
1292 | int errno; | |
1293 | char tmp[__NEW_UTS_LEN]; | |
1294 | ||
bb96a6f5 | 1295 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1296 | return -EPERM; |
fc832ad3 | 1297 | |
1da177e4 LT |
1298 | if (len < 0 || len > __NEW_UTS_LEN) |
1299 | return -EINVAL; | |
1300 | down_write(&uts_sem); | |
1301 | errno = -EFAULT; | |
1302 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1303 | struct new_utsname *u = utsname(); |
1304 | ||
1305 | memcpy(u->nodename, tmp, len); | |
1306 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1307 | errno = 0; |
1308 | } | |
f1ecf068 | 1309 | uts_proc_notify(UTS_PROC_HOSTNAME); |
1da177e4 LT |
1310 | up_write(&uts_sem); |
1311 | return errno; | |
1312 | } | |
1313 | ||
1314 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1315 | ||
5a8a82b1 | 1316 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1317 | { |
1318 | int i, errno; | |
9679e4dd | 1319 | struct new_utsname *u; |
1da177e4 LT |
1320 | |
1321 | if (len < 0) | |
1322 | return -EINVAL; | |
1323 | down_read(&uts_sem); | |
9679e4dd AM |
1324 | u = utsname(); |
1325 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1326 | if (i > len) |
1327 | i = len; | |
1328 | errno = 0; | |
9679e4dd | 1329 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1330 | errno = -EFAULT; |
1331 | up_read(&uts_sem); | |
1332 | return errno; | |
1333 | } | |
1334 | ||
1335 | #endif | |
1336 | ||
1337 | /* | |
1338 | * Only setdomainname; getdomainname can be implemented by calling | |
1339 | * uname() | |
1340 | */ | |
5a8a82b1 | 1341 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1342 | { |
1343 | int errno; | |
1344 | char tmp[__NEW_UTS_LEN]; | |
1345 | ||
fc832ad3 | 1346 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1347 | return -EPERM; |
1348 | if (len < 0 || len > __NEW_UTS_LEN) | |
1349 | return -EINVAL; | |
1350 | ||
1351 | down_write(&uts_sem); | |
1352 | errno = -EFAULT; | |
1353 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1354 | struct new_utsname *u = utsname(); |
1355 | ||
1356 | memcpy(u->domainname, tmp, len); | |
1357 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1358 | errno = 0; |
1359 | } | |
f1ecf068 | 1360 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
1da177e4 LT |
1361 | up_write(&uts_sem); |
1362 | return errno; | |
1363 | } | |
1364 | ||
e48fbb69 | 1365 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1366 | { |
b9518345 JS |
1367 | struct rlimit value; |
1368 | int ret; | |
1369 | ||
1370 | ret = do_prlimit(current, resource, NULL, &value); | |
1371 | if (!ret) | |
1372 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1373 | ||
1374 | return ret; | |
1da177e4 LT |
1375 | } |
1376 | ||
1377 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1378 | ||
1379 | /* | |
1380 | * Back compatibility for getrlimit. Needed for some apps. | |
1381 | */ | |
1382 | ||
e48fbb69 HC |
1383 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1384 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1385 | { |
1386 | struct rlimit x; | |
1387 | if (resource >= RLIM_NLIMITS) | |
1388 | return -EINVAL; | |
1389 | ||
1390 | task_lock(current->group_leader); | |
1391 | x = current->signal->rlim[resource]; | |
1392 | task_unlock(current->group_leader); | |
756184b7 | 1393 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1394 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1395 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1396 | x.rlim_max = 0x7FFFFFFF; |
1397 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1398 | } | |
1399 | ||
1400 | #endif | |
1401 | ||
c022a0ac JS |
1402 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1403 | { | |
1404 | #if BITS_PER_LONG < 64 | |
1405 | return rlim64 >= ULONG_MAX; | |
1406 | #else | |
1407 | return rlim64 == RLIM64_INFINITY; | |
1408 | #endif | |
1409 | } | |
1410 | ||
1411 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1412 | { | |
1413 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1414 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1415 | else | |
1416 | rlim64->rlim_cur = rlim->rlim_cur; | |
1417 | if (rlim->rlim_max == RLIM_INFINITY) | |
1418 | rlim64->rlim_max = RLIM64_INFINITY; | |
1419 | else | |
1420 | rlim64->rlim_max = rlim->rlim_max; | |
1421 | } | |
1422 | ||
1423 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1424 | { | |
1425 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1426 | rlim->rlim_cur = RLIM_INFINITY; | |
1427 | else | |
1428 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1429 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1430 | rlim->rlim_max = RLIM_INFINITY; | |
1431 | else | |
1432 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1433 | } | |
1434 | ||
1c1e618d | 1435 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1436 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1437 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1438 | { |
5b41535a | 1439 | struct rlimit *rlim; |
86f162f4 | 1440 | int retval = 0; |
1da177e4 LT |
1441 | |
1442 | if (resource >= RLIM_NLIMITS) | |
1443 | return -EINVAL; | |
5b41535a JS |
1444 | if (new_rlim) { |
1445 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1446 | return -EINVAL; | |
1447 | if (resource == RLIMIT_NOFILE && | |
1448 | new_rlim->rlim_max > sysctl_nr_open) | |
1449 | return -EPERM; | |
1450 | } | |
1da177e4 | 1451 | |
1c1e618d JS |
1452 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1453 | read_lock(&tasklist_lock); | |
1454 | if (!tsk->sighand) { | |
1455 | retval = -ESRCH; | |
1456 | goto out; | |
1457 | } | |
1458 | ||
5b41535a | 1459 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1460 | task_lock(tsk->group_leader); |
5b41535a | 1461 | if (new_rlim) { |
fc832ad3 SH |
1462 | /* Keep the capable check against init_user_ns until |
1463 | cgroups can contain all limits */ | |
5b41535a JS |
1464 | if (new_rlim->rlim_max > rlim->rlim_max && |
1465 | !capable(CAP_SYS_RESOURCE)) | |
1466 | retval = -EPERM; | |
1467 | if (!retval) | |
1468 | retval = security_task_setrlimit(tsk->group_leader, | |
1469 | resource, new_rlim); | |
1470 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1471 | /* | |
1472 | * The caller is asking for an immediate RLIMIT_CPU | |
1473 | * expiry. But we use the zero value to mean "it was | |
1474 | * never set". So let's cheat and make it one second | |
1475 | * instead | |
1476 | */ | |
1477 | new_rlim->rlim_cur = 1; | |
1478 | } | |
1479 | } | |
1480 | if (!retval) { | |
1481 | if (old_rlim) | |
1482 | *old_rlim = *rlim; | |
1483 | if (new_rlim) | |
1484 | *rlim = *new_rlim; | |
9926e4c7 | 1485 | } |
7855c35d | 1486 | task_unlock(tsk->group_leader); |
1da177e4 | 1487 | |
d3561f78 AM |
1488 | /* |
1489 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1490 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1491 | * very long-standing error, and fixing it now risks breakage of | |
1492 | * applications, so we live with it | |
1493 | */ | |
5b41535a JS |
1494 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
1495 | new_rlim->rlim_cur != RLIM_INFINITY) | |
1496 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); | |
ec9e16ba | 1497 | out: |
1c1e618d | 1498 | read_unlock(&tasklist_lock); |
2fb9d268 | 1499 | return retval; |
1da177e4 LT |
1500 | } |
1501 | ||
c022a0ac JS |
1502 | /* rcu lock must be held */ |
1503 | static int check_prlimit_permission(struct task_struct *task) | |
1504 | { | |
1505 | const struct cred *cred = current_cred(), *tcred; | |
1506 | ||
fc832ad3 SH |
1507 | if (current == task) |
1508 | return 0; | |
c022a0ac | 1509 | |
fc832ad3 | 1510 | tcred = __task_cred(task); |
c4a4d603 | 1511 | if (cred->user_ns == tcred->user_ns && |
fc832ad3 SH |
1512 | (cred->uid == tcred->euid && |
1513 | cred->uid == tcred->suid && | |
1514 | cred->uid == tcred->uid && | |
1515 | cred->gid == tcred->egid && | |
1516 | cred->gid == tcred->sgid && | |
1517 | cred->gid == tcred->gid)) | |
1518 | return 0; | |
c4a4d603 | 1519 | if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) |
fc832ad3 SH |
1520 | return 0; |
1521 | ||
1522 | return -EPERM; | |
c022a0ac JS |
1523 | } |
1524 | ||
1525 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1526 | const struct rlimit64 __user *, new_rlim, | |
1527 | struct rlimit64 __user *, old_rlim) | |
1528 | { | |
1529 | struct rlimit64 old64, new64; | |
1530 | struct rlimit old, new; | |
1531 | struct task_struct *tsk; | |
1532 | int ret; | |
1533 | ||
1534 | if (new_rlim) { | |
1535 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1536 | return -EFAULT; | |
1537 | rlim64_to_rlim(&new64, &new); | |
1538 | } | |
1539 | ||
1540 | rcu_read_lock(); | |
1541 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1542 | if (!tsk) { | |
1543 | rcu_read_unlock(); | |
1544 | return -ESRCH; | |
1545 | } | |
1546 | ret = check_prlimit_permission(tsk); | |
1547 | if (ret) { | |
1548 | rcu_read_unlock(); | |
1549 | return ret; | |
1550 | } | |
1551 | get_task_struct(tsk); | |
1552 | rcu_read_unlock(); | |
1553 | ||
1554 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1555 | old_rlim ? &old : NULL); | |
1556 | ||
1557 | if (!ret && old_rlim) { | |
1558 | rlim_to_rlim64(&old, &old64); | |
1559 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1560 | ret = -EFAULT; | |
1561 | } | |
1562 | ||
1563 | put_task_struct(tsk); | |
1564 | return ret; | |
1565 | } | |
1566 | ||
7855c35d JS |
1567 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1568 | { | |
1569 | struct rlimit new_rlim; | |
1570 | ||
1571 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1572 | return -EFAULT; | |
5b41535a | 1573 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1574 | } |
1575 | ||
1da177e4 LT |
1576 | /* |
1577 | * It would make sense to put struct rusage in the task_struct, | |
1578 | * except that would make the task_struct be *really big*. After | |
1579 | * task_struct gets moved into malloc'ed memory, it would | |
1580 | * make sense to do this. It will make moving the rest of the information | |
1581 | * a lot simpler! (Which we're not doing right now because we're not | |
1582 | * measuring them yet). | |
1583 | * | |
1da177e4 LT |
1584 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1585 | * races with threads incrementing their own counters. But since word | |
1586 | * reads are atomic, we either get new values or old values and we don't | |
1587 | * care which for the sums. We always take the siglock to protect reading | |
1588 | * the c* fields from p->signal from races with exit.c updating those | |
1589 | * fields when reaping, so a sample either gets all the additions of a | |
1590 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1591 | * |
de047c1b RT |
1592 | * Locking: |
1593 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1594 | * for the cases current multithreaded, non-current single threaded | |
1595 | * non-current multithreaded. Thread traversal is now safe with | |
1596 | * the siglock held. | |
1597 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1598 | * single threaded, as no one else can take our signal_struct away, no one | |
1599 | * else can reap the children to update signal->c* counters, and no one else | |
1600 | * can race with the signal-> fields. If we do not take any lock, the | |
1601 | * signal-> fields could be read out of order while another thread was just | |
1602 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1603 | * On the writer side, write memory barrier is implied in __exit_signal | |
1604 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1605 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1606 | * |
1da177e4 LT |
1607 | */ |
1608 | ||
f06febc9 | 1609 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1610 | { |
679c9cd4 SK |
1611 | r->ru_nvcsw += t->nvcsw; |
1612 | r->ru_nivcsw += t->nivcsw; | |
1613 | r->ru_minflt += t->min_flt; | |
1614 | r->ru_majflt += t->maj_flt; | |
1615 | r->ru_inblock += task_io_get_inblock(t); | |
1616 | r->ru_oublock += task_io_get_oublock(t); | |
1617 | } | |
1618 | ||
1da177e4 LT |
1619 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1620 | { | |
1621 | struct task_struct *t; | |
1622 | unsigned long flags; | |
0cf55e1e | 1623 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1624 | unsigned long maxrss = 0; |
1da177e4 LT |
1625 | |
1626 | memset((char *) r, 0, sizeof *r); | |
64861634 | 1627 | utime = stime = 0; |
1da177e4 | 1628 | |
679c9cd4 | 1629 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1630 | task_times(current, &utime, &stime); |
f06febc9 | 1631 | accumulate_thread_rusage(p, r); |
1f10206c | 1632 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1633 | goto out; |
1634 | } | |
1635 | ||
d6cf723a | 1636 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1637 | return; |
0f59cc4a | 1638 | |
1da177e4 | 1639 | switch (who) { |
0f59cc4a | 1640 | case RUSAGE_BOTH: |
1da177e4 | 1641 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1642 | utime = p->signal->cutime; |
1643 | stime = p->signal->cstime; | |
1644 | r->ru_nvcsw = p->signal->cnvcsw; | |
1645 | r->ru_nivcsw = p->signal->cnivcsw; | |
1646 | r->ru_minflt = p->signal->cmin_flt; | |
1647 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1648 | r->ru_inblock = p->signal->cinblock; |
1649 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1650 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1651 | |
1652 | if (who == RUSAGE_CHILDREN) | |
1653 | break; | |
1654 | ||
1da177e4 | 1655 | case RUSAGE_SELF: |
0cf55e1e | 1656 | thread_group_times(p, &tgutime, &tgstime); |
64861634 MS |
1657 | utime += tgutime; |
1658 | stime += tgstime; | |
1da177e4 LT |
1659 | r->ru_nvcsw += p->signal->nvcsw; |
1660 | r->ru_nivcsw += p->signal->nivcsw; | |
1661 | r->ru_minflt += p->signal->min_flt; | |
1662 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1663 | r->ru_inblock += p->signal->inblock; |
1664 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1665 | if (maxrss < p->signal->maxrss) |
1666 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1667 | t = p; |
1668 | do { | |
f06febc9 | 1669 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1670 | t = next_thread(t); |
1671 | } while (t != p); | |
1da177e4 | 1672 | break; |
0f59cc4a | 1673 | |
1da177e4 LT |
1674 | default: |
1675 | BUG(); | |
1676 | } | |
de047c1b | 1677 | unlock_task_sighand(p, &flags); |
de047c1b | 1678 | |
679c9cd4 | 1679 | out: |
0f59cc4a ON |
1680 | cputime_to_timeval(utime, &r->ru_utime); |
1681 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1682 | |
1683 | if (who != RUSAGE_CHILDREN) { | |
1684 | struct mm_struct *mm = get_task_mm(p); | |
1685 | if (mm) { | |
1686 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1687 | mmput(mm); | |
1688 | } | |
1689 | } | |
1690 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1694 | { | |
1695 | struct rusage r; | |
1da177e4 | 1696 | k_getrusage(p, who, &r); |
1da177e4 LT |
1697 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1698 | } | |
1699 | ||
e48fbb69 | 1700 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1701 | { |
679c9cd4 SK |
1702 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1703 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1704 | return -EINVAL; |
1705 | return getrusage(current, who, ru); | |
1706 | } | |
1707 | ||
e48fbb69 | 1708 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1709 | { |
1710 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1711 | return mask; | |
1712 | } | |
3b7391de | 1713 | |
028ee4be CG |
1714 | #ifdef CONFIG_CHECKPOINT_RESTORE |
1715 | static int prctl_set_mm(int opt, unsigned long addr, | |
1716 | unsigned long arg4, unsigned long arg5) | |
1717 | { | |
1718 | unsigned long rlim = rlimit(RLIMIT_DATA); | |
1719 | unsigned long vm_req_flags; | |
1720 | unsigned long vm_bad_flags; | |
1721 | struct vm_area_struct *vma; | |
1722 | int error = 0; | |
1723 | struct mm_struct *mm = current->mm; | |
1724 | ||
1725 | if (arg4 | arg5) | |
1726 | return -EINVAL; | |
1727 | ||
79f0713d | 1728 | if (!capable(CAP_SYS_RESOURCE)) |
028ee4be CG |
1729 | return -EPERM; |
1730 | ||
1731 | if (addr >= TASK_SIZE) | |
1732 | return -EINVAL; | |
1733 | ||
1734 | down_read(&mm->mmap_sem); | |
1735 | vma = find_vma(mm, addr); | |
1736 | ||
1737 | if (opt != PR_SET_MM_START_BRK && opt != PR_SET_MM_BRK) { | |
1738 | /* It must be existing VMA */ | |
1739 | if (!vma || vma->vm_start > addr) | |
1740 | goto out; | |
1741 | } | |
1742 | ||
1743 | error = -EINVAL; | |
1744 | switch (opt) { | |
1745 | case PR_SET_MM_START_CODE: | |
1746 | case PR_SET_MM_END_CODE: | |
1747 | vm_req_flags = VM_READ | VM_EXEC; | |
1748 | vm_bad_flags = VM_WRITE | VM_MAYSHARE; | |
1749 | ||
1750 | if ((vma->vm_flags & vm_req_flags) != vm_req_flags || | |
1751 | (vma->vm_flags & vm_bad_flags)) | |
1752 | goto out; | |
1753 | ||
1754 | if (opt == PR_SET_MM_START_CODE) | |
1755 | mm->start_code = addr; | |
1756 | else | |
1757 | mm->end_code = addr; | |
1758 | break; | |
1759 | ||
1760 | case PR_SET_MM_START_DATA: | |
1761 | case PR_SET_MM_END_DATA: | |
1762 | vm_req_flags = VM_READ | VM_WRITE; | |
1763 | vm_bad_flags = VM_EXEC | VM_MAYSHARE; | |
1764 | ||
1765 | if ((vma->vm_flags & vm_req_flags) != vm_req_flags || | |
1766 | (vma->vm_flags & vm_bad_flags)) | |
1767 | goto out; | |
1768 | ||
1769 | if (opt == PR_SET_MM_START_DATA) | |
1770 | mm->start_data = addr; | |
1771 | else | |
1772 | mm->end_data = addr; | |
1773 | break; | |
1774 | ||
1775 | case PR_SET_MM_START_STACK: | |
1776 | ||
1777 | #ifdef CONFIG_STACK_GROWSUP | |
1778 | vm_req_flags = VM_READ | VM_WRITE | VM_GROWSUP; | |
1779 | #else | |
1780 | vm_req_flags = VM_READ | VM_WRITE | VM_GROWSDOWN; | |
1781 | #endif | |
1782 | if ((vma->vm_flags & vm_req_flags) != vm_req_flags) | |
1783 | goto out; | |
1784 | ||
1785 | mm->start_stack = addr; | |
1786 | break; | |
1787 | ||
1788 | case PR_SET_MM_START_BRK: | |
1789 | if (addr <= mm->end_data) | |
1790 | goto out; | |
1791 | ||
1792 | if (rlim < RLIM_INFINITY && | |
1793 | (mm->brk - addr) + | |
1794 | (mm->end_data - mm->start_data) > rlim) | |
1795 | goto out; | |
1796 | ||
1797 | mm->start_brk = addr; | |
1798 | break; | |
1799 | ||
1800 | case PR_SET_MM_BRK: | |
1801 | if (addr <= mm->end_data) | |
1802 | goto out; | |
1803 | ||
1804 | if (rlim < RLIM_INFINITY && | |
1805 | (addr - mm->start_brk) + | |
1806 | (mm->end_data - mm->start_data) > rlim) | |
1807 | goto out; | |
1808 | ||
1809 | mm->brk = addr; | |
1810 | break; | |
1811 | ||
1812 | default: | |
1813 | error = -EINVAL; | |
1814 | goto out; | |
1815 | } | |
1816 | ||
1817 | error = 0; | |
1818 | ||
1819 | out: | |
1820 | up_read(&mm->mmap_sem); | |
1821 | ||
1822 | return error; | |
1823 | } | |
1824 | #else /* CONFIG_CHECKPOINT_RESTORE */ | |
1825 | static int prctl_set_mm(int opt, unsigned long addr, | |
1826 | unsigned long arg4, unsigned long arg5) | |
1827 | { | |
1828 | return -EINVAL; | |
1829 | } | |
1830 | #endif | |
1831 | ||
c4ea37c2 HC |
1832 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1833 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1834 | { |
b6dff3ec DH |
1835 | struct task_struct *me = current; |
1836 | unsigned char comm[sizeof(me->comm)]; | |
1837 | long error; | |
1da177e4 | 1838 | |
d84f4f99 DH |
1839 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1840 | if (error != -ENOSYS) | |
1da177e4 LT |
1841 | return error; |
1842 | ||
d84f4f99 | 1843 | error = 0; |
1da177e4 LT |
1844 | switch (option) { |
1845 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1846 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1847 | error = -EINVAL; |
1848 | break; | |
1849 | } | |
b6dff3ec DH |
1850 | me->pdeath_signal = arg2; |
1851 | error = 0; | |
1da177e4 LT |
1852 | break; |
1853 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1854 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1855 | break; |
1856 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1857 | error = get_dumpable(me->mm); |
1da177e4 LT |
1858 | break; |
1859 | case PR_SET_DUMPABLE: | |
abf75a50 | 1860 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1861 | error = -EINVAL; |
1862 | break; | |
1863 | } | |
b6dff3ec DH |
1864 | set_dumpable(me->mm, arg2); |
1865 | error = 0; | |
1da177e4 LT |
1866 | break; |
1867 | ||
1868 | case PR_SET_UNALIGN: | |
b6dff3ec | 1869 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1870 | break; |
1871 | case PR_GET_UNALIGN: | |
b6dff3ec | 1872 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1873 | break; |
1874 | case PR_SET_FPEMU: | |
b6dff3ec | 1875 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1876 | break; |
1877 | case PR_GET_FPEMU: | |
b6dff3ec | 1878 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1879 | break; |
1880 | case PR_SET_FPEXC: | |
b6dff3ec | 1881 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1882 | break; |
1883 | case PR_GET_FPEXC: | |
b6dff3ec | 1884 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1885 | break; |
1886 | case PR_GET_TIMING: | |
1887 | error = PR_TIMING_STATISTICAL; | |
1888 | break; | |
1889 | case PR_SET_TIMING: | |
7b26655f | 1890 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1891 | error = -EINVAL; |
b6dff3ec DH |
1892 | else |
1893 | error = 0; | |
1da177e4 LT |
1894 | break; |
1895 | ||
b6dff3ec DH |
1896 | case PR_SET_NAME: |
1897 | comm[sizeof(me->comm)-1] = 0; | |
1898 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1899 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1900 | return -EFAULT; |
b6dff3ec | 1901 | set_task_comm(me, comm); |
f786ecba | 1902 | proc_comm_connector(me); |
1da177e4 | 1903 | return 0; |
b6dff3ec DH |
1904 | case PR_GET_NAME: |
1905 | get_task_comm(comm, me); | |
1906 | if (copy_to_user((char __user *)arg2, comm, | |
1907 | sizeof(comm))) | |
1da177e4 LT |
1908 | return -EFAULT; |
1909 | return 0; | |
651d765d | 1910 | case PR_GET_ENDIAN: |
b6dff3ec | 1911 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1912 | break; |
1913 | case PR_SET_ENDIAN: | |
b6dff3ec | 1914 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1915 | break; |
1916 | ||
1d9d02fe AA |
1917 | case PR_GET_SECCOMP: |
1918 | error = prctl_get_seccomp(); | |
1919 | break; | |
1920 | case PR_SET_SECCOMP: | |
1921 | error = prctl_set_seccomp(arg2); | |
1922 | break; | |
8fb402bc EB |
1923 | case PR_GET_TSC: |
1924 | error = GET_TSC_CTL(arg2); | |
1925 | break; | |
1926 | case PR_SET_TSC: | |
1927 | error = SET_TSC_CTL(arg2); | |
1928 | break; | |
cdd6c482 IM |
1929 | case PR_TASK_PERF_EVENTS_DISABLE: |
1930 | error = perf_event_task_disable(); | |
1d1c7ddb | 1931 | break; |
cdd6c482 IM |
1932 | case PR_TASK_PERF_EVENTS_ENABLE: |
1933 | error = perf_event_task_enable(); | |
1d1c7ddb | 1934 | break; |
6976675d AV |
1935 | case PR_GET_TIMERSLACK: |
1936 | error = current->timer_slack_ns; | |
1937 | break; | |
1938 | case PR_SET_TIMERSLACK: | |
1939 | if (arg2 <= 0) | |
1940 | current->timer_slack_ns = | |
1941 | current->default_timer_slack_ns; | |
1942 | else | |
1943 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1944 | error = 0; |
6976675d | 1945 | break; |
4db96cf0 AK |
1946 | case PR_MCE_KILL: |
1947 | if (arg4 | arg5) | |
1948 | return -EINVAL; | |
1949 | switch (arg2) { | |
1087e9b4 | 1950 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1951 | if (arg3 != 0) |
1952 | return -EINVAL; | |
1953 | current->flags &= ~PF_MCE_PROCESS; | |
1954 | break; | |
1087e9b4 | 1955 | case PR_MCE_KILL_SET: |
4db96cf0 | 1956 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1957 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1958 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1959 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1960 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1961 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1962 | current->flags &= | |
1963 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1964 | else | |
1965 | return -EINVAL; | |
4db96cf0 AK |
1966 | break; |
1967 | default: | |
1968 | return -EINVAL; | |
1969 | } | |
1970 | error = 0; | |
1971 | break; | |
1087e9b4 AK |
1972 | case PR_MCE_KILL_GET: |
1973 | if (arg2 | arg3 | arg4 | arg5) | |
1974 | return -EINVAL; | |
1975 | if (current->flags & PF_MCE_PROCESS) | |
1976 | error = (current->flags & PF_MCE_EARLY) ? | |
1977 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1978 | else | |
1979 | error = PR_MCE_KILL_DEFAULT; | |
1980 | break; | |
028ee4be CG |
1981 | case PR_SET_MM: |
1982 | error = prctl_set_mm(arg2, arg3, arg4, arg5); | |
1983 | break; | |
ebec18a6 LP |
1984 | case PR_SET_CHILD_SUBREAPER: |
1985 | me->signal->is_child_subreaper = !!arg2; | |
1986 | error = 0; | |
1987 | break; | |
1988 | case PR_GET_CHILD_SUBREAPER: | |
1989 | error = put_user(me->signal->is_child_subreaper, | |
1990 | (int __user *) arg2); | |
1991 | break; | |
1da177e4 LT |
1992 | default: |
1993 | error = -EINVAL; | |
1994 | break; | |
1995 | } | |
1996 | return error; | |
1997 | } | |
3cfc348b | 1998 | |
836f92ad HC |
1999 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
2000 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
2001 | { |
2002 | int err = 0; | |
2003 | int cpu = raw_smp_processor_id(); | |
2004 | if (cpup) | |
2005 | err |= put_user(cpu, cpup); | |
2006 | if (nodep) | |
2007 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
2008 | return err ? -EFAULT : 0; |
2009 | } | |
10a0a8d4 JF |
2010 | |
2011 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
2012 | ||
a06a4dc3 | 2013 | static void argv_cleanup(struct subprocess_info *info) |
10a0a8d4 | 2014 | { |
a06a4dc3 | 2015 | argv_free(info->argv); |
10a0a8d4 JF |
2016 | } |
2017 | ||
2018 | /** | |
2019 | * orderly_poweroff - Trigger an orderly system poweroff | |
2020 | * @force: force poweroff if command execution fails | |
2021 | * | |
2022 | * This may be called from any context to trigger a system shutdown. | |
2023 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
2024 | */ | |
2025 | int orderly_poweroff(bool force) | |
2026 | { | |
2027 | int argc; | |
2028 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
2029 | static char *envp[] = { | |
2030 | "HOME=/", | |
2031 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
2032 | NULL | |
2033 | }; | |
2034 | int ret = -ENOMEM; | |
2035 | struct subprocess_info *info; | |
2036 | ||
2037 | if (argv == NULL) { | |
2038 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
2039 | __func__, poweroff_cmd); | |
2040 | goto out; | |
2041 | } | |
2042 | ||
ac331d15 | 2043 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
2044 | if (info == NULL) { |
2045 | argv_free(argv); | |
2046 | goto out; | |
2047 | } | |
2048 | ||
a06a4dc3 | 2049 | call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
10a0a8d4 | 2050 | |
86313c48 | 2051 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
2052 | |
2053 | out: | |
2054 | if (ret && force) { | |
2055 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
2056 | "forcing the issue\n"); | |
2057 | ||
2058 | /* I guess this should try to kick off some daemon to | |
2059 | sync and poweroff asap. Or not even bother syncing | |
2060 | if we're doing an emergency shutdown? */ | |
2061 | emergency_sync(); | |
2062 | kernel_power_off(); | |
2063 | } | |
2064 | ||
2065 | return ret; | |
2066 | } | |
2067 | EXPORT_SYMBOL_GPL(orderly_poweroff); |