Commit | Line | Data |
---|---|---|
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> | |
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> |
1da177e4 LT |
36 | |
37 | #include <linux/compat.h> | |
38 | #include <linux/syscalls.h> | |
00d7c05a | 39 | #include <linux/kprobes.h> |
acce292c | 40 | #include <linux/user_namespace.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/io.h> | |
44 | #include <asm/unistd.h> | |
45 | ||
46 | #ifndef SET_UNALIGN_CTL | |
47 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
48 | #endif | |
49 | #ifndef GET_UNALIGN_CTL | |
50 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
51 | #endif | |
52 | #ifndef SET_FPEMU_CTL | |
53 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
54 | #endif | |
55 | #ifndef GET_FPEMU_CTL | |
56 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
57 | #endif | |
58 | #ifndef SET_FPEXC_CTL | |
59 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
60 | #endif | |
61 | #ifndef GET_FPEXC_CTL | |
62 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
63 | #endif | |
651d765d AB |
64 | #ifndef GET_ENDIAN |
65 | # define GET_ENDIAN(a,b) (-EINVAL) | |
66 | #endif | |
67 | #ifndef SET_ENDIAN | |
68 | # define SET_ENDIAN(a,b) (-EINVAL) | |
69 | #endif | |
8fb402bc EB |
70 | #ifndef GET_TSC_CTL |
71 | # define GET_TSC_CTL(a) (-EINVAL) | |
72 | #endif | |
73 | #ifndef SET_TSC_CTL | |
74 | # define SET_TSC_CTL(a) (-EINVAL) | |
75 | #endif | |
1da177e4 LT |
76 | |
77 | /* | |
78 | * this is where the system-wide overflow UID and GID are defined, for | |
79 | * architectures that now have 32-bit UID/GID but didn't in the past | |
80 | */ | |
81 | ||
82 | int overflowuid = DEFAULT_OVERFLOWUID; | |
83 | int overflowgid = DEFAULT_OVERFLOWGID; | |
84 | ||
85 | #ifdef CONFIG_UID16 | |
86 | EXPORT_SYMBOL(overflowuid); | |
87 | EXPORT_SYMBOL(overflowgid); | |
88 | #endif | |
89 | ||
90 | /* | |
91 | * the same as above, but for filesystems which can only store a 16-bit | |
92 | * UID and GID. as such, this is needed on all architectures | |
93 | */ | |
94 | ||
95 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
96 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
97 | ||
98 | EXPORT_SYMBOL(fs_overflowuid); | |
99 | EXPORT_SYMBOL(fs_overflowgid); | |
100 | ||
101 | /* | |
102 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
103 | */ | |
104 | ||
105 | int C_A_D = 1; | |
9ec52099 CLG |
106 | struct pid *cad_pid; |
107 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 108 | |
bd804eba RW |
109 | /* |
110 | * If set, this is used for preparing the system to power off. | |
111 | */ | |
112 | ||
113 | void (*pm_power_off_prepare)(void); | |
bd804eba | 114 | |
1da177e4 LT |
115 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
116 | { | |
117 | int no_nice; | |
118 | ||
119 | if (p->uid != current->euid && | |
120 | p->euid != current->euid && !capable(CAP_SYS_NICE)) { | |
121 | error = -EPERM; | |
122 | goto out; | |
123 | } | |
e43379f1 | 124 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
125 | error = -EACCES; |
126 | goto out; | |
127 | } | |
128 | no_nice = security_task_setnice(p, niceval); | |
129 | if (no_nice) { | |
130 | error = no_nice; | |
131 | goto out; | |
132 | } | |
133 | if (error == -ESRCH) | |
134 | error = 0; | |
135 | set_user_nice(p, niceval); | |
136 | out: | |
137 | return error; | |
138 | } | |
139 | ||
140 | asmlinkage long sys_setpriority(int which, int who, int niceval) | |
141 | { | |
142 | struct task_struct *g, *p; | |
143 | struct user_struct *user; | |
144 | int error = -EINVAL; | |
41487c65 | 145 | struct pid *pgrp; |
1da177e4 | 146 | |
3e88c553 | 147 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
148 | goto out; |
149 | ||
150 | /* normalize: avoid signed division (rounding problems) */ | |
151 | error = -ESRCH; | |
152 | if (niceval < -20) | |
153 | niceval = -20; | |
154 | if (niceval > 19) | |
155 | niceval = 19; | |
156 | ||
157 | read_lock(&tasklist_lock); | |
158 | switch (which) { | |
159 | case PRIO_PROCESS: | |
41487c65 | 160 | if (who) |
228ebcbe | 161 | p = find_task_by_vpid(who); |
41487c65 EB |
162 | else |
163 | p = current; | |
1da177e4 LT |
164 | if (p) |
165 | error = set_one_prio(p, niceval, error); | |
166 | break; | |
167 | case PRIO_PGRP: | |
41487c65 | 168 | if (who) |
b488893a | 169 | pgrp = find_vpid(who); |
41487c65 EB |
170 | else |
171 | pgrp = task_pgrp(current); | |
172 | do_each_pid_task(pgrp, PIDTYPE_PGID, p) { | |
1da177e4 | 173 | error = set_one_prio(p, niceval, error); |
41487c65 | 174 | } while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
175 | break; |
176 | case PRIO_USER: | |
177 | user = current->user; | |
178 | if (!who) | |
179 | who = current->uid; | |
180 | else | |
181 | if ((who != current->uid) && !(user = find_user(who))) | |
182 | goto out_unlock; /* No processes for this user */ | |
183 | ||
184 | do_each_thread(g, p) | |
185 | if (p->uid == who) | |
186 | error = set_one_prio(p, niceval, error); | |
187 | while_each_thread(g, p); | |
188 | if (who != current->uid) | |
189 | free_uid(user); /* For find_user() */ | |
190 | break; | |
191 | } | |
192 | out_unlock: | |
193 | read_unlock(&tasklist_lock); | |
194 | out: | |
195 | return error; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Ugh. To avoid negative return values, "getpriority()" will | |
200 | * not return the normal nice-value, but a negated value that | |
201 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
202 | * to stay compatible. | |
203 | */ | |
204 | asmlinkage long sys_getpriority(int which, int who) | |
205 | { | |
206 | struct task_struct *g, *p; | |
207 | struct user_struct *user; | |
208 | long niceval, retval = -ESRCH; | |
41487c65 | 209 | struct pid *pgrp; |
1da177e4 | 210 | |
3e88c553 | 211 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
212 | return -EINVAL; |
213 | ||
214 | read_lock(&tasklist_lock); | |
215 | switch (which) { | |
216 | case PRIO_PROCESS: | |
41487c65 | 217 | if (who) |
228ebcbe | 218 | p = find_task_by_vpid(who); |
41487c65 EB |
219 | else |
220 | p = current; | |
1da177e4 LT |
221 | if (p) { |
222 | niceval = 20 - task_nice(p); | |
223 | if (niceval > retval) | |
224 | retval = niceval; | |
225 | } | |
226 | break; | |
227 | case PRIO_PGRP: | |
41487c65 | 228 | if (who) |
b488893a | 229 | pgrp = find_vpid(who); |
41487c65 EB |
230 | else |
231 | pgrp = task_pgrp(current); | |
232 | do_each_pid_task(pgrp, PIDTYPE_PGID, p) { | |
1da177e4 LT |
233 | niceval = 20 - task_nice(p); |
234 | if (niceval > retval) | |
235 | retval = niceval; | |
41487c65 | 236 | } while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
237 | break; |
238 | case PRIO_USER: | |
239 | user = current->user; | |
240 | if (!who) | |
241 | who = current->uid; | |
242 | else | |
243 | if ((who != current->uid) && !(user = find_user(who))) | |
244 | goto out_unlock; /* No processes for this user */ | |
245 | ||
246 | do_each_thread(g, p) | |
247 | if (p->uid == who) { | |
248 | niceval = 20 - task_nice(p); | |
249 | if (niceval > retval) | |
250 | retval = niceval; | |
251 | } | |
252 | while_each_thread(g, p); | |
253 | if (who != current->uid) | |
254 | free_uid(user); /* for find_user() */ | |
255 | break; | |
256 | } | |
257 | out_unlock: | |
258 | read_unlock(&tasklist_lock); | |
259 | ||
260 | return retval; | |
261 | } | |
262 | ||
e4c94330 EB |
263 | /** |
264 | * emergency_restart - reboot the system | |
265 | * | |
266 | * Without shutting down any hardware or taking any locks | |
267 | * reboot the system. This is called when we know we are in | |
268 | * trouble so this is our best effort to reboot. This is | |
269 | * safe to call in interrupt context. | |
270 | */ | |
7c903473 EB |
271 | void emergency_restart(void) |
272 | { | |
273 | machine_emergency_restart(); | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(emergency_restart); | |
276 | ||
83cc5ed3 | 277 | static void kernel_restart_prepare(char *cmd) |
4a00ea1e | 278 | { |
e041c683 | 279 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 280 | system_state = SYSTEM_RESTART; |
4a00ea1e | 281 | device_shutdown(); |
58b3b71d | 282 | sysdev_shutdown(); |
e4c94330 | 283 | } |
1e5d5331 RD |
284 | |
285 | /** | |
286 | * kernel_restart - reboot the system | |
287 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 288 | * or %NULL |
1e5d5331 RD |
289 | * |
290 | * Shutdown everything and perform a clean reboot. | |
291 | * This is not safe to call in interrupt context. | |
292 | */ | |
e4c94330 EB |
293 | void kernel_restart(char *cmd) |
294 | { | |
295 | kernel_restart_prepare(cmd); | |
756184b7 | 296 | if (!cmd) |
4a00ea1e | 297 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 298 | else |
4a00ea1e | 299 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
300 | machine_restart(cmd); |
301 | } | |
302 | EXPORT_SYMBOL_GPL(kernel_restart); | |
303 | ||
4ef7229f | 304 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 305 | { |
e041c683 | 306 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
307 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
308 | system_state = state; | |
309 | device_shutdown(); | |
310 | } | |
e4c94330 EB |
311 | /** |
312 | * kernel_halt - halt the system | |
313 | * | |
314 | * Shutdown everything and perform a clean system halt. | |
315 | */ | |
e4c94330 EB |
316 | void kernel_halt(void) |
317 | { | |
729b4d4c | 318 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 319 | sysdev_shutdown(); |
4a00ea1e EB |
320 | printk(KERN_EMERG "System halted.\n"); |
321 | machine_halt(); | |
322 | } | |
729b4d4c | 323 | |
4a00ea1e EB |
324 | EXPORT_SYMBOL_GPL(kernel_halt); |
325 | ||
e4c94330 EB |
326 | /** |
327 | * kernel_power_off - power_off the system | |
328 | * | |
329 | * Shutdown everything and perform a clean system power_off. | |
330 | */ | |
e4c94330 EB |
331 | void kernel_power_off(void) |
332 | { | |
729b4d4c | 333 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
334 | if (pm_power_off_prepare) |
335 | pm_power_off_prepare(); | |
4047727e | 336 | disable_nonboot_cpus(); |
58b3b71d | 337 | sysdev_shutdown(); |
4a00ea1e EB |
338 | printk(KERN_EMERG "Power down.\n"); |
339 | machine_power_off(); | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
1da177e4 LT |
342 | /* |
343 | * Reboot system call: for obvious reasons only root may call it, | |
344 | * and even root needs to set up some magic numbers in the registers | |
345 | * so that some mistake won't make this reboot the whole machine. | |
346 | * You can also set the meaning of the ctrl-alt-del-key here. | |
347 | * | |
348 | * reboot doesn't sync: do that yourself before calling this. | |
349 | */ | |
350 | asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) | |
351 | { | |
352 | char buffer[256]; | |
353 | ||
354 | /* We only trust the superuser with rebooting the system. */ | |
355 | if (!capable(CAP_SYS_BOOT)) | |
356 | return -EPERM; | |
357 | ||
358 | /* For safety, we require "magic" arguments. */ | |
359 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
360 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
361 | magic2 != LINUX_REBOOT_MAGIC2A && | |
362 | magic2 != LINUX_REBOOT_MAGIC2B && | |
363 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
364 | return -EINVAL; | |
365 | ||
5e38291d EB |
366 | /* Instead of trying to make the power_off code look like |
367 | * halt when pm_power_off is not set do it the easy way. | |
368 | */ | |
369 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
370 | cmd = LINUX_REBOOT_CMD_HALT; | |
371 | ||
1da177e4 LT |
372 | lock_kernel(); |
373 | switch (cmd) { | |
374 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 375 | kernel_restart(NULL); |
1da177e4 LT |
376 | break; |
377 | ||
378 | case LINUX_REBOOT_CMD_CAD_ON: | |
379 | C_A_D = 1; | |
380 | break; | |
381 | ||
382 | case LINUX_REBOOT_CMD_CAD_OFF: | |
383 | C_A_D = 0; | |
384 | break; | |
385 | ||
386 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 387 | kernel_halt(); |
1da177e4 LT |
388 | unlock_kernel(); |
389 | do_exit(0); | |
390 | break; | |
391 | ||
392 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 393 | kernel_power_off(); |
1da177e4 LT |
394 | unlock_kernel(); |
395 | do_exit(0); | |
396 | break; | |
397 | ||
398 | case LINUX_REBOOT_CMD_RESTART2: | |
399 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
400 | unlock_kernel(); | |
401 | return -EFAULT; | |
402 | } | |
403 | buffer[sizeof(buffer) - 1] = '\0'; | |
404 | ||
4a00ea1e | 405 | kernel_restart(buffer); |
1da177e4 LT |
406 | break; |
407 | ||
3ab83521 | 408 | #ifdef CONFIG_KEXEC |
dc009d92 | 409 | case LINUX_REBOOT_CMD_KEXEC: |
3ab83521 HY |
410 | { |
411 | int ret; | |
412 | ret = kernel_kexec(); | |
413 | unlock_kernel(); | |
414 | return ret; | |
415 | } | |
416 | #endif | |
4a00ea1e | 417 | |
b0cb1a19 | 418 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
419 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
420 | { | |
a3d25c27 | 421 | int ret = hibernate(); |
1da177e4 LT |
422 | unlock_kernel(); |
423 | return ret; | |
424 | } | |
425 | #endif | |
426 | ||
427 | default: | |
428 | unlock_kernel(); | |
429 | return -EINVAL; | |
430 | } | |
431 | unlock_kernel(); | |
432 | return 0; | |
433 | } | |
434 | ||
65f27f38 | 435 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 436 | { |
abcd9e51 | 437 | kernel_restart(NULL); |
1da177e4 LT |
438 | } |
439 | ||
440 | /* | |
441 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
442 | * As it's called within an interrupt, it may NOT sync: the only choice | |
443 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
444 | */ | |
445 | void ctrl_alt_del(void) | |
446 | { | |
65f27f38 | 447 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
448 | |
449 | if (C_A_D) | |
450 | schedule_work(&cad_work); | |
451 | else | |
9ec52099 | 452 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
453 | } |
454 | ||
1da177e4 LT |
455 | /* |
456 | * Unprivileged users may change the real gid to the effective gid | |
457 | * or vice versa. (BSD-style) | |
458 | * | |
459 | * If you set the real gid at all, or set the effective gid to a value not | |
460 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
461 | * | |
462 | * This makes it possible for a setgid program to completely drop its | |
463 | * privileges, which is often a useful assertion to make when you are doing | |
464 | * a security audit over a program. | |
465 | * | |
466 | * The general idea is that a program which uses just setregid() will be | |
467 | * 100% compatible with BSD. A program which uses just setgid() will be | |
468 | * 100% compatible with POSIX with saved IDs. | |
469 | * | |
470 | * SMP: There are not races, the GIDs are checked only by filesystem | |
471 | * operations (as far as semantic preservation is concerned). | |
472 | */ | |
473 | asmlinkage long sys_setregid(gid_t rgid, gid_t egid) | |
474 | { | |
475 | int old_rgid = current->gid; | |
476 | int old_egid = current->egid; | |
477 | int new_rgid = old_rgid; | |
478 | int new_egid = old_egid; | |
479 | int retval; | |
480 | ||
481 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); | |
482 | if (retval) | |
483 | return retval; | |
484 | ||
485 | if (rgid != (gid_t) -1) { | |
486 | if ((old_rgid == rgid) || | |
487 | (current->egid==rgid) || | |
488 | capable(CAP_SETGID)) | |
489 | new_rgid = rgid; | |
490 | else | |
491 | return -EPERM; | |
492 | } | |
493 | if (egid != (gid_t) -1) { | |
494 | if ((old_rgid == egid) || | |
495 | (current->egid == egid) || | |
496 | (current->sgid == egid) || | |
497 | capable(CAP_SETGID)) | |
498 | new_egid = egid; | |
756184b7 | 499 | else |
1da177e4 | 500 | return -EPERM; |
1da177e4 | 501 | } |
756184b7 | 502 | if (new_egid != old_egid) { |
6c5d5238 | 503 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 504 | smp_wmb(); |
1da177e4 LT |
505 | } |
506 | if (rgid != (gid_t) -1 || | |
507 | (egid != (gid_t) -1 && egid != old_rgid)) | |
508 | current->sgid = new_egid; | |
509 | current->fsgid = new_egid; | |
510 | current->egid = new_egid; | |
511 | current->gid = new_rgid; | |
512 | key_fsgid_changed(current); | |
9f46080c | 513 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
514 | return 0; |
515 | } | |
516 | ||
517 | /* | |
518 | * setgid() is implemented like SysV w/ SAVED_IDS | |
519 | * | |
520 | * SMP: Same implicit races as above. | |
521 | */ | |
522 | asmlinkage long sys_setgid(gid_t gid) | |
523 | { | |
524 | int old_egid = current->egid; | |
525 | int retval; | |
526 | ||
527 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); | |
528 | if (retval) | |
529 | return retval; | |
530 | ||
756184b7 CP |
531 | if (capable(CAP_SETGID)) { |
532 | if (old_egid != gid) { | |
6c5d5238 | 533 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 534 | smp_wmb(); |
1da177e4 LT |
535 | } |
536 | current->gid = current->egid = current->sgid = current->fsgid = gid; | |
756184b7 CP |
537 | } else if ((gid == current->gid) || (gid == current->sgid)) { |
538 | if (old_egid != gid) { | |
6c5d5238 | 539 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 540 | smp_wmb(); |
1da177e4 LT |
541 | } |
542 | current->egid = current->fsgid = gid; | |
543 | } | |
544 | else | |
545 | return -EPERM; | |
546 | ||
547 | key_fsgid_changed(current); | |
9f46080c | 548 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
549 | return 0; |
550 | } | |
551 | ||
552 | static int set_user(uid_t new_ruid, int dumpclear) | |
553 | { | |
554 | struct user_struct *new_user; | |
555 | ||
acce292c | 556 | new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); |
1da177e4 LT |
557 | if (!new_user) |
558 | return -EAGAIN; | |
559 | ||
560 | if (atomic_read(&new_user->processes) >= | |
561 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
acce292c | 562 | new_user != current->nsproxy->user_ns->root_user) { |
1da177e4 LT |
563 | free_uid(new_user); |
564 | return -EAGAIN; | |
565 | } | |
566 | ||
567 | switch_uid(new_user); | |
568 | ||
756184b7 | 569 | if (dumpclear) { |
6c5d5238 | 570 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 571 | smp_wmb(); |
1da177e4 LT |
572 | } |
573 | current->uid = new_ruid; | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Unprivileged users may change the real uid to the effective uid | |
579 | * or vice versa. (BSD-style) | |
580 | * | |
581 | * If you set the real uid at all, or set the effective uid to a value not | |
582 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
583 | * | |
584 | * This makes it possible for a setuid program to completely drop its | |
585 | * privileges, which is often a useful assertion to make when you are doing | |
586 | * a security audit over a program. | |
587 | * | |
588 | * The general idea is that a program which uses just setreuid() will be | |
589 | * 100% compatible with BSD. A program which uses just setuid() will be | |
590 | * 100% compatible with POSIX with saved IDs. | |
591 | */ | |
592 | asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) | |
593 | { | |
594 | int old_ruid, old_euid, old_suid, new_ruid, new_euid; | |
595 | int retval; | |
596 | ||
597 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); | |
598 | if (retval) | |
599 | return retval; | |
600 | ||
601 | new_ruid = old_ruid = current->uid; | |
602 | new_euid = old_euid = current->euid; | |
603 | old_suid = current->suid; | |
604 | ||
605 | if (ruid != (uid_t) -1) { | |
606 | new_ruid = ruid; | |
607 | if ((old_ruid != ruid) && | |
608 | (current->euid != ruid) && | |
609 | !capable(CAP_SETUID)) | |
610 | return -EPERM; | |
611 | } | |
612 | ||
613 | if (euid != (uid_t) -1) { | |
614 | new_euid = euid; | |
615 | if ((old_ruid != euid) && | |
616 | (current->euid != euid) && | |
617 | (current->suid != euid) && | |
618 | !capable(CAP_SETUID)) | |
619 | return -EPERM; | |
620 | } | |
621 | ||
622 | if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) | |
623 | return -EAGAIN; | |
624 | ||
756184b7 | 625 | if (new_euid != old_euid) { |
6c5d5238 | 626 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 627 | smp_wmb(); |
1da177e4 LT |
628 | } |
629 | current->fsuid = current->euid = new_euid; | |
630 | if (ruid != (uid_t) -1 || | |
631 | (euid != (uid_t) -1 && euid != old_ruid)) | |
632 | current->suid = current->euid; | |
633 | current->fsuid = current->euid; | |
634 | ||
635 | key_fsuid_changed(current); | |
9f46080c | 636 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
637 | |
638 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); | |
639 | } | |
640 | ||
641 | ||
642 | ||
643 | /* | |
644 | * setuid() is implemented like SysV with SAVED_IDS | |
645 | * | |
646 | * Note that SAVED_ID's is deficient in that a setuid root program | |
647 | * like sendmail, for example, cannot set its uid to be a normal | |
648 | * user and then switch back, because if you're root, setuid() sets | |
649 | * the saved uid too. If you don't like this, blame the bright people | |
650 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
651 | * will allow a root program to temporarily drop privileges and be able to | |
652 | * regain them by swapping the real and effective uid. | |
653 | */ | |
654 | asmlinkage long sys_setuid(uid_t uid) | |
655 | { | |
656 | int old_euid = current->euid; | |
a09c17a6 | 657 | int old_ruid, old_suid, new_suid; |
1da177e4 LT |
658 | int retval; |
659 | ||
660 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); | |
661 | if (retval) | |
662 | return retval; | |
663 | ||
a09c17a6 | 664 | old_ruid = current->uid; |
1da177e4 LT |
665 | old_suid = current->suid; |
666 | new_suid = old_suid; | |
667 | ||
668 | if (capable(CAP_SETUID)) { | |
669 | if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) | |
670 | return -EAGAIN; | |
671 | new_suid = uid; | |
672 | } else if ((uid != current->uid) && (uid != new_suid)) | |
673 | return -EPERM; | |
674 | ||
756184b7 | 675 | if (old_euid != uid) { |
6c5d5238 | 676 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 677 | smp_wmb(); |
1da177e4 LT |
678 | } |
679 | current->fsuid = current->euid = uid; | |
680 | current->suid = new_suid; | |
681 | ||
682 | key_fsuid_changed(current); | |
9f46080c | 683 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
684 | |
685 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); | |
686 | } | |
687 | ||
688 | ||
689 | /* | |
690 | * This function implements a generic ability to update ruid, euid, | |
691 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
692 | */ | |
693 | asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) | |
694 | { | |
695 | int old_ruid = current->uid; | |
696 | int old_euid = current->euid; | |
697 | int old_suid = current->suid; | |
698 | int retval; | |
699 | ||
700 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); | |
701 | if (retval) | |
702 | return retval; | |
703 | ||
704 | if (!capable(CAP_SETUID)) { | |
705 | if ((ruid != (uid_t) -1) && (ruid != current->uid) && | |
706 | (ruid != current->euid) && (ruid != current->suid)) | |
707 | return -EPERM; | |
708 | if ((euid != (uid_t) -1) && (euid != current->uid) && | |
709 | (euid != current->euid) && (euid != current->suid)) | |
710 | return -EPERM; | |
711 | if ((suid != (uid_t) -1) && (suid != current->uid) && | |
712 | (suid != current->euid) && (suid != current->suid)) | |
713 | return -EPERM; | |
714 | } | |
715 | if (ruid != (uid_t) -1) { | |
716 | if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0) | |
717 | return -EAGAIN; | |
718 | } | |
719 | if (euid != (uid_t) -1) { | |
756184b7 | 720 | if (euid != current->euid) { |
6c5d5238 | 721 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 722 | smp_wmb(); |
1da177e4 LT |
723 | } |
724 | current->euid = euid; | |
725 | } | |
726 | current->fsuid = current->euid; | |
727 | if (suid != (uid_t) -1) | |
728 | current->suid = suid; | |
729 | ||
730 | key_fsuid_changed(current); | |
9f46080c | 731 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
732 | |
733 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); | |
734 | } | |
735 | ||
736 | asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) | |
737 | { | |
738 | int retval; | |
739 | ||
740 | if (!(retval = put_user(current->uid, ruid)) && | |
741 | !(retval = put_user(current->euid, euid))) | |
742 | retval = put_user(current->suid, suid); | |
743 | ||
744 | return retval; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Same as above, but for rgid, egid, sgid. | |
749 | */ | |
750 | asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) | |
751 | { | |
752 | int retval; | |
753 | ||
754 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); | |
755 | if (retval) | |
756 | return retval; | |
757 | ||
758 | if (!capable(CAP_SETGID)) { | |
759 | if ((rgid != (gid_t) -1) && (rgid != current->gid) && | |
760 | (rgid != current->egid) && (rgid != current->sgid)) | |
761 | return -EPERM; | |
762 | if ((egid != (gid_t) -1) && (egid != current->gid) && | |
763 | (egid != current->egid) && (egid != current->sgid)) | |
764 | return -EPERM; | |
765 | if ((sgid != (gid_t) -1) && (sgid != current->gid) && | |
766 | (sgid != current->egid) && (sgid != current->sgid)) | |
767 | return -EPERM; | |
768 | } | |
769 | if (egid != (gid_t) -1) { | |
756184b7 | 770 | if (egid != current->egid) { |
6c5d5238 | 771 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 772 | smp_wmb(); |
1da177e4 LT |
773 | } |
774 | current->egid = egid; | |
775 | } | |
776 | current->fsgid = current->egid; | |
777 | if (rgid != (gid_t) -1) | |
778 | current->gid = rgid; | |
779 | if (sgid != (gid_t) -1) | |
780 | current->sgid = sgid; | |
781 | ||
782 | key_fsgid_changed(current); | |
9f46080c | 783 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
784 | return 0; |
785 | } | |
786 | ||
787 | asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) | |
788 | { | |
789 | int retval; | |
790 | ||
791 | if (!(retval = put_user(current->gid, rgid)) && | |
792 | !(retval = put_user(current->egid, egid))) | |
793 | retval = put_user(current->sgid, sgid); | |
794 | ||
795 | return retval; | |
796 | } | |
797 | ||
798 | ||
799 | /* | |
800 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
801 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
802 | * whatever uid it wants to). It normally shadows "euid", except when | |
803 | * explicitly set by setfsuid() or for access.. | |
804 | */ | |
805 | asmlinkage long sys_setfsuid(uid_t uid) | |
806 | { | |
807 | int old_fsuid; | |
808 | ||
809 | old_fsuid = current->fsuid; | |
810 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) | |
811 | return old_fsuid; | |
812 | ||
813 | if (uid == current->uid || uid == current->euid || | |
814 | uid == current->suid || uid == current->fsuid || | |
756184b7 CP |
815 | capable(CAP_SETUID)) { |
816 | if (uid != old_fsuid) { | |
6c5d5238 | 817 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 818 | smp_wmb(); |
1da177e4 LT |
819 | } |
820 | current->fsuid = uid; | |
821 | } | |
822 | ||
823 | key_fsuid_changed(current); | |
9f46080c | 824 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
825 | |
826 | security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); | |
827 | ||
828 | return old_fsuid; | |
829 | } | |
830 | ||
831 | /* | |
f42df9e6 | 832 | * Samma på svenska.. |
1da177e4 LT |
833 | */ |
834 | asmlinkage long sys_setfsgid(gid_t gid) | |
835 | { | |
836 | int old_fsgid; | |
837 | ||
838 | old_fsgid = current->fsgid; | |
839 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) | |
840 | return old_fsgid; | |
841 | ||
842 | if (gid == current->gid || gid == current->egid || | |
843 | gid == current->sgid || gid == current->fsgid || | |
756184b7 CP |
844 | capable(CAP_SETGID)) { |
845 | if (gid != old_fsgid) { | |
6c5d5238 | 846 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 847 | smp_wmb(); |
1da177e4 LT |
848 | } |
849 | current->fsgid = gid; | |
850 | key_fsgid_changed(current); | |
9f46080c | 851 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
852 | } |
853 | return old_fsgid; | |
854 | } | |
855 | ||
856 | asmlinkage long sys_times(struct tms __user * tbuf) | |
857 | { | |
858 | /* | |
859 | * In the SMP world we might just be unlucky and have one of | |
860 | * the times increment as we use it. Since the value is an | |
861 | * atomically safe type this is just fine. Conceptually its | |
862 | * as if the syscall took an instant longer to occur. | |
863 | */ | |
864 | if (tbuf) { | |
865 | struct tms tmp; | |
35f5cad8 ON |
866 | struct task_struct *tsk = current; |
867 | struct task_struct *t; | |
1da177e4 LT |
868 | cputime_t utime, stime, cutime, cstime; |
869 | ||
7d7185c8 | 870 | spin_lock_irq(&tsk->sighand->siglock); |
35f5cad8 ON |
871 | utime = tsk->signal->utime; |
872 | stime = tsk->signal->stime; | |
873 | t = tsk; | |
874 | do { | |
875 | utime = cputime_add(utime, t->utime); | |
876 | stime = cputime_add(stime, t->stime); | |
877 | t = next_thread(t); | |
878 | } while (t != tsk); | |
879 | ||
35f5cad8 ON |
880 | cutime = tsk->signal->cutime; |
881 | cstime = tsk->signal->cstime; | |
882 | spin_unlock_irq(&tsk->sighand->siglock); | |
1da177e4 LT |
883 | |
884 | tmp.tms_utime = cputime_to_clock_t(utime); | |
885 | tmp.tms_stime = cputime_to_clock_t(stime); | |
886 | tmp.tms_cutime = cputime_to_clock_t(cutime); | |
887 | tmp.tms_cstime = cputime_to_clock_t(cstime); | |
888 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) | |
889 | return -EFAULT; | |
890 | } | |
891 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); | |
892 | } | |
893 | ||
894 | /* | |
895 | * This needs some heavy checking ... | |
896 | * I just haven't the stomach for it. I also don't fully | |
897 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
898 | * | |
899 | * OK, I think I have the protection semantics right.... this is really | |
900 | * only important on a multi-user system anyway, to make sure one user | |
901 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
902 | * | |
903 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
904 | * LBT 04.03.94 | |
905 | */ | |
1da177e4 LT |
906 | asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) |
907 | { | |
908 | struct task_struct *p; | |
ee0acf90 | 909 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
910 | struct pid *pgrp; |
911 | int err; | |
1da177e4 LT |
912 | |
913 | if (!pid) | |
b488893a | 914 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
915 | if (!pgid) |
916 | pgid = pid; | |
917 | if (pgid < 0) | |
918 | return -EINVAL; | |
919 | ||
920 | /* From this point forward we keep holding onto the tasklist lock | |
921 | * so that our parent does not change from under us. -DaveM | |
922 | */ | |
923 | write_lock_irq(&tasklist_lock); | |
924 | ||
925 | err = -ESRCH; | |
4e021306 | 926 | p = find_task_by_vpid(pid); |
1da177e4 LT |
927 | if (!p) |
928 | goto out; | |
929 | ||
930 | err = -EINVAL; | |
931 | if (!thread_group_leader(p)) | |
932 | goto out; | |
933 | ||
4e021306 | 934 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 935 | err = -EPERM; |
41487c65 | 936 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
937 | goto out; |
938 | err = -EACCES; | |
939 | if (p->did_exec) | |
940 | goto out; | |
941 | } else { | |
942 | err = -ESRCH; | |
ee0acf90 | 943 | if (p != group_leader) |
1da177e4 LT |
944 | goto out; |
945 | } | |
946 | ||
947 | err = -EPERM; | |
948 | if (p->signal->leader) | |
949 | goto out; | |
950 | ||
4e021306 | 951 | pgrp = task_pid(p); |
1da177e4 | 952 | if (pgid != pid) { |
b488893a | 953 | struct task_struct *g; |
1da177e4 | 954 | |
4e021306 ON |
955 | pgrp = find_vpid(pgid); |
956 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 957 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 958 | goto out; |
1da177e4 LT |
959 | } |
960 | ||
1da177e4 LT |
961 | err = security_task_setpgid(p, pgid); |
962 | if (err) | |
963 | goto out; | |
964 | ||
4e021306 | 965 | if (task_pgrp(p) != pgrp) { |
83beaf3c | 966 | change_pid(p, PIDTYPE_PGID, pgrp); |
4e021306 | 967 | set_task_pgrp(p, pid_nr(pgrp)); |
1da177e4 LT |
968 | } |
969 | ||
970 | err = 0; | |
971 | out: | |
972 | /* All paths lead to here, thus we are safe. -DaveM */ | |
973 | write_unlock_irq(&tasklist_lock); | |
974 | return err; | |
975 | } | |
976 | ||
977 | asmlinkage long sys_getpgid(pid_t pid) | |
978 | { | |
12a3de0a ON |
979 | struct task_struct *p; |
980 | struct pid *grp; | |
981 | int retval; | |
982 | ||
983 | rcu_read_lock(); | |
756184b7 | 984 | if (!pid) |
12a3de0a | 985 | grp = task_pgrp(current); |
756184b7 | 986 | else { |
1da177e4 | 987 | retval = -ESRCH; |
12a3de0a ON |
988 | p = find_task_by_vpid(pid); |
989 | if (!p) | |
990 | goto out; | |
991 | grp = task_pgrp(p); | |
992 | if (!grp) | |
993 | goto out; | |
994 | ||
995 | retval = security_task_getpgid(p); | |
996 | if (retval) | |
997 | goto out; | |
1da177e4 | 998 | } |
12a3de0a ON |
999 | retval = pid_vnr(grp); |
1000 | out: | |
1001 | rcu_read_unlock(); | |
1002 | return retval; | |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1006 | ||
1007 | asmlinkage long sys_getpgrp(void) | |
1008 | { | |
12a3de0a | 1009 | return sys_getpgid(0); |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | #endif | |
1013 | ||
1014 | asmlinkage long sys_getsid(pid_t pid) | |
1015 | { | |
1dd768c0 ON |
1016 | struct task_struct *p; |
1017 | struct pid *sid; | |
1018 | int retval; | |
1019 | ||
1020 | rcu_read_lock(); | |
756184b7 | 1021 | if (!pid) |
1dd768c0 | 1022 | sid = task_session(current); |
756184b7 | 1023 | else { |
1da177e4 | 1024 | retval = -ESRCH; |
1dd768c0 ON |
1025 | p = find_task_by_vpid(pid); |
1026 | if (!p) | |
1027 | goto out; | |
1028 | sid = task_session(p); | |
1029 | if (!sid) | |
1030 | goto out; | |
1031 | ||
1032 | retval = security_task_getsid(p); | |
1033 | if (retval) | |
1034 | goto out; | |
1da177e4 | 1035 | } |
1dd768c0 ON |
1036 | retval = pid_vnr(sid); |
1037 | out: | |
1038 | rcu_read_unlock(); | |
1039 | return retval; | |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | asmlinkage long sys_setsid(void) | |
1043 | { | |
e19f247a | 1044 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1045 | struct pid *sid = task_pid(group_leader); |
1046 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1047 | int err = -EPERM; |
1048 | ||
1da177e4 | 1049 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1050 | /* Fail if I am already a session leader */ |
1051 | if (group_leader->signal->leader) | |
1052 | goto out; | |
1053 | ||
430c6231 ON |
1054 | /* Fail if a process group id already exists that equals the |
1055 | * proposed session id. | |
390e2ff0 | 1056 | */ |
6806aac6 | 1057 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1058 | goto out; |
1059 | ||
e19f247a | 1060 | group_leader->signal->leader = 1; |
8520d7c7 | 1061 | __set_special_pids(sid); |
24ec839c PZ |
1062 | |
1063 | spin_lock(&group_leader->sighand->siglock); | |
e19f247a | 1064 | group_leader->signal->tty = NULL; |
24ec839c PZ |
1065 | spin_unlock(&group_leader->sighand->siglock); |
1066 | ||
e4cc0a9c | 1067 | err = session; |
1da177e4 LT |
1068 | out: |
1069 | write_unlock_irq(&tasklist_lock); | |
1da177e4 LT |
1070 | return err; |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Supplementary group IDs | |
1075 | */ | |
1076 | ||
1077 | /* init to 2 - one for init_task, one to ensure it is never freed */ | |
1078 | struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; | |
1079 | ||
1080 | struct group_info *groups_alloc(int gidsetsize) | |
1081 | { | |
1082 | struct group_info *group_info; | |
1083 | int nblocks; | |
1084 | int i; | |
1085 | ||
1086 | nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; | |
1087 | /* Make sure we always allocate at least one indirect block pointer */ | |
1088 | nblocks = nblocks ? : 1; | |
1089 | group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER); | |
1090 | if (!group_info) | |
1091 | return NULL; | |
1092 | group_info->ngroups = gidsetsize; | |
1093 | group_info->nblocks = nblocks; | |
1094 | atomic_set(&group_info->usage, 1); | |
1095 | ||
756184b7 | 1096 | if (gidsetsize <= NGROUPS_SMALL) |
1da177e4 | 1097 | group_info->blocks[0] = group_info->small_block; |
756184b7 | 1098 | else { |
1da177e4 LT |
1099 | for (i = 0; i < nblocks; i++) { |
1100 | gid_t *b; | |
1101 | b = (void *)__get_free_page(GFP_USER); | |
1102 | if (!b) | |
1103 | goto out_undo_partial_alloc; | |
1104 | group_info->blocks[i] = b; | |
1105 | } | |
1106 | } | |
1107 | return group_info; | |
1108 | ||
1109 | out_undo_partial_alloc: | |
1110 | while (--i >= 0) { | |
1111 | free_page((unsigned long)group_info->blocks[i]); | |
1112 | } | |
1113 | kfree(group_info); | |
1114 | return NULL; | |
1115 | } | |
1116 | ||
1117 | EXPORT_SYMBOL(groups_alloc); | |
1118 | ||
1119 | void groups_free(struct group_info *group_info) | |
1120 | { | |
1121 | if (group_info->blocks[0] != group_info->small_block) { | |
1122 | int i; | |
1123 | for (i = 0; i < group_info->nblocks; i++) | |
1124 | free_page((unsigned long)group_info->blocks[i]); | |
1125 | } | |
1126 | kfree(group_info); | |
1127 | } | |
1128 | ||
1129 | EXPORT_SYMBOL(groups_free); | |
1130 | ||
1131 | /* export the group_info to a user-space array */ | |
1132 | static int groups_to_user(gid_t __user *grouplist, | |
1133 | struct group_info *group_info) | |
1134 | { | |
1135 | int i; | |
1bf47346 | 1136 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1137 | |
1138 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1139 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1140 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1141 | |
1bf47346 | 1142 | if (copy_to_user(grouplist, group_info->blocks[i], len)) |
1da177e4 LT |
1143 | return -EFAULT; |
1144 | ||
1bf47346 | 1145 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1146 | count -= cp_count; |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | /* fill a group_info from a user-space array - it must be allocated already */ | |
1152 | static int groups_from_user(struct group_info *group_info, | |
1153 | gid_t __user *grouplist) | |
756184b7 | 1154 | { |
1da177e4 | 1155 | int i; |
1bf47346 | 1156 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1157 | |
1158 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1159 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1160 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1161 | |
1bf47346 | 1162 | if (copy_from_user(group_info->blocks[i], grouplist, len)) |
1da177e4 LT |
1163 | return -EFAULT; |
1164 | ||
1bf47346 | 1165 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1166 | count -= cp_count; |
1167 | } | |
1168 | return 0; | |
1169 | } | |
1170 | ||
ebe8b541 | 1171 | /* a simple Shell sort */ |
1da177e4 LT |
1172 | static void groups_sort(struct group_info *group_info) |
1173 | { | |
1174 | int base, max, stride; | |
1175 | int gidsetsize = group_info->ngroups; | |
1176 | ||
1177 | for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1) | |
1178 | ; /* nothing */ | |
1179 | stride /= 3; | |
1180 | ||
1181 | while (stride) { | |
1182 | max = gidsetsize - stride; | |
1183 | for (base = 0; base < max; base++) { | |
1184 | int left = base; | |
1185 | int right = left + stride; | |
1186 | gid_t tmp = GROUP_AT(group_info, right); | |
1187 | ||
1188 | while (left >= 0 && GROUP_AT(group_info, left) > tmp) { | |
1189 | GROUP_AT(group_info, right) = | |
1190 | GROUP_AT(group_info, left); | |
1191 | right = left; | |
1192 | left -= stride; | |
1193 | } | |
1194 | GROUP_AT(group_info, right) = tmp; | |
1195 | } | |
1196 | stride /= 3; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | /* a simple bsearch */ | |
3e30148c | 1201 | int groups_search(struct group_info *group_info, gid_t grp) |
1da177e4 | 1202 | { |
d74beb9f | 1203 | unsigned int left, right; |
1da177e4 LT |
1204 | |
1205 | if (!group_info) | |
1206 | return 0; | |
1207 | ||
1208 | left = 0; | |
1209 | right = group_info->ngroups; | |
1210 | while (left < right) { | |
d74beb9f | 1211 | unsigned int mid = (left+right)/2; |
1da177e4 LT |
1212 | int cmp = grp - GROUP_AT(group_info, mid); |
1213 | if (cmp > 0) | |
1214 | left = mid + 1; | |
1215 | else if (cmp < 0) | |
1216 | right = mid; | |
1217 | else | |
1218 | return 1; | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | /* validate and set current->group_info */ | |
1224 | int set_current_groups(struct group_info *group_info) | |
1225 | { | |
1226 | int retval; | |
1227 | struct group_info *old_info; | |
1228 | ||
1229 | retval = security_task_setgroups(group_info); | |
1230 | if (retval) | |
1231 | return retval; | |
1232 | ||
1233 | groups_sort(group_info); | |
1234 | get_group_info(group_info); | |
1235 | ||
1236 | task_lock(current); | |
1237 | old_info = current->group_info; | |
1238 | current->group_info = group_info; | |
1239 | task_unlock(current); | |
1240 | ||
1241 | put_group_info(old_info); | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | EXPORT_SYMBOL(set_current_groups); | |
1247 | ||
1248 | asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) | |
1249 | { | |
1250 | int i = 0; | |
1251 | ||
1252 | /* | |
1253 | * SMP: Nobody else can change our grouplist. Thus we are | |
1254 | * safe. | |
1255 | */ | |
1256 | ||
1257 | if (gidsetsize < 0) | |
1258 | return -EINVAL; | |
1259 | ||
1260 | /* no need to grab task_lock here; it cannot change */ | |
1da177e4 LT |
1261 | i = current->group_info->ngroups; |
1262 | if (gidsetsize) { | |
1263 | if (i > gidsetsize) { | |
1264 | i = -EINVAL; | |
1265 | goto out; | |
1266 | } | |
1267 | if (groups_to_user(grouplist, current->group_info)) { | |
1268 | i = -EFAULT; | |
1269 | goto out; | |
1270 | } | |
1271 | } | |
1272 | out: | |
1da177e4 LT |
1273 | return i; |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * SMP: Our groups are copy-on-write. We can set them safely | |
1278 | * without another task interfering. | |
1279 | */ | |
1280 | ||
1281 | asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist) | |
1282 | { | |
1283 | struct group_info *group_info; | |
1284 | int retval; | |
1285 | ||
1286 | if (!capable(CAP_SETGID)) | |
1287 | return -EPERM; | |
1288 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
1289 | return -EINVAL; | |
1290 | ||
1291 | group_info = groups_alloc(gidsetsize); | |
1292 | if (!group_info) | |
1293 | return -ENOMEM; | |
1294 | retval = groups_from_user(group_info, grouplist); | |
1295 | if (retval) { | |
1296 | put_group_info(group_info); | |
1297 | return retval; | |
1298 | } | |
1299 | ||
1300 | retval = set_current_groups(group_info); | |
1301 | put_group_info(group_info); | |
1302 | ||
1303 | return retval; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Check whether we're fsgid/egid or in the supplemental group.. | |
1308 | */ | |
1309 | int in_group_p(gid_t grp) | |
1310 | { | |
1311 | int retval = 1; | |
756184b7 | 1312 | if (grp != current->fsgid) |
1da177e4 | 1313 | retval = groups_search(current->group_info, grp); |
1da177e4 LT |
1314 | return retval; |
1315 | } | |
1316 | ||
1317 | EXPORT_SYMBOL(in_group_p); | |
1318 | ||
1319 | int in_egroup_p(gid_t grp) | |
1320 | { | |
1321 | int retval = 1; | |
756184b7 | 1322 | if (grp != current->egid) |
1da177e4 | 1323 | retval = groups_search(current->group_info, grp); |
1da177e4 LT |
1324 | return retval; |
1325 | } | |
1326 | ||
1327 | EXPORT_SYMBOL(in_egroup_p); | |
1328 | ||
1329 | DECLARE_RWSEM(uts_sem); | |
1330 | ||
1da177e4 LT |
1331 | asmlinkage long sys_newuname(struct new_utsname __user * name) |
1332 | { | |
1333 | int errno = 0; | |
1334 | ||
1335 | down_read(&uts_sem); | |
e9ff3990 | 1336 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1337 | errno = -EFAULT; |
1338 | up_read(&uts_sem); | |
1339 | return errno; | |
1340 | } | |
1341 | ||
1342 | asmlinkage long sys_sethostname(char __user *name, int len) | |
1343 | { | |
1344 | int errno; | |
1345 | char tmp[__NEW_UTS_LEN]; | |
1346 | ||
1347 | if (!capable(CAP_SYS_ADMIN)) | |
1348 | return -EPERM; | |
1349 | if (len < 0 || len > __NEW_UTS_LEN) | |
1350 | return -EINVAL; | |
1351 | down_write(&uts_sem); | |
1352 | errno = -EFAULT; | |
1353 | if (!copy_from_user(tmp, name, len)) { | |
e9ff3990 SH |
1354 | memcpy(utsname()->nodename, tmp, len); |
1355 | utsname()->nodename[len] = 0; | |
1da177e4 LT |
1356 | errno = 0; |
1357 | } | |
1358 | up_write(&uts_sem); | |
1359 | return errno; | |
1360 | } | |
1361 | ||
1362 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1363 | ||
1364 | asmlinkage long sys_gethostname(char __user *name, int len) | |
1365 | { | |
1366 | int i, errno; | |
1367 | ||
1368 | if (len < 0) | |
1369 | return -EINVAL; | |
1370 | down_read(&uts_sem); | |
e9ff3990 | 1371 | i = 1 + strlen(utsname()->nodename); |
1da177e4 LT |
1372 | if (i > len) |
1373 | i = len; | |
1374 | errno = 0; | |
e9ff3990 | 1375 | if (copy_to_user(name, utsname()->nodename, i)) |
1da177e4 LT |
1376 | errno = -EFAULT; |
1377 | up_read(&uts_sem); | |
1378 | return errno; | |
1379 | } | |
1380 | ||
1381 | #endif | |
1382 | ||
1383 | /* | |
1384 | * Only setdomainname; getdomainname can be implemented by calling | |
1385 | * uname() | |
1386 | */ | |
1387 | asmlinkage long sys_setdomainname(char __user *name, int len) | |
1388 | { | |
1389 | int errno; | |
1390 | char tmp[__NEW_UTS_LEN]; | |
1391 | ||
1392 | if (!capable(CAP_SYS_ADMIN)) | |
1393 | return -EPERM; | |
1394 | if (len < 0 || len > __NEW_UTS_LEN) | |
1395 | return -EINVAL; | |
1396 | ||
1397 | down_write(&uts_sem); | |
1398 | errno = -EFAULT; | |
1399 | if (!copy_from_user(tmp, name, len)) { | |
e9ff3990 SH |
1400 | memcpy(utsname()->domainname, tmp, len); |
1401 | utsname()->domainname[len] = 0; | |
1da177e4 LT |
1402 | errno = 0; |
1403 | } | |
1404 | up_write(&uts_sem); | |
1405 | return errno; | |
1406 | } | |
1407 | ||
1408 | asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1409 | { | |
1410 | if (resource >= RLIM_NLIMITS) | |
1411 | return -EINVAL; | |
1412 | else { | |
1413 | struct rlimit value; | |
1414 | task_lock(current->group_leader); | |
1415 | value = current->signal->rlim[resource]; | |
1416 | task_unlock(current->group_leader); | |
1417 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1422 | ||
1423 | /* | |
1424 | * Back compatibility for getrlimit. Needed for some apps. | |
1425 | */ | |
1426 | ||
1427 | asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1428 | { | |
1429 | struct rlimit x; | |
1430 | if (resource >= RLIM_NLIMITS) | |
1431 | return -EINVAL; | |
1432 | ||
1433 | task_lock(current->group_leader); | |
1434 | x = current->signal->rlim[resource]; | |
1435 | task_unlock(current->group_leader); | |
756184b7 | 1436 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1437 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1438 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1439 | x.rlim_max = 0x7FFFFFFF; |
1440 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1441 | } | |
1442 | ||
1443 | #endif | |
1444 | ||
1445 | asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1446 | { | |
1447 | struct rlimit new_rlim, *old_rlim; | |
ec9e16ba | 1448 | unsigned long it_prof_secs; |
1da177e4 LT |
1449 | int retval; |
1450 | ||
1451 | if (resource >= RLIM_NLIMITS) | |
1452 | return -EINVAL; | |
ec9e16ba | 1453 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1454 | return -EFAULT; |
ec9e16ba AM |
1455 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
1456 | return -EINVAL; | |
1da177e4 LT |
1457 | old_rlim = current->signal->rlim + resource; |
1458 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1459 | !capable(CAP_SYS_RESOURCE)) | |
1460 | return -EPERM; | |
9cfe015a | 1461 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
ec9e16ba | 1462 | return -EPERM; |
1da177e4 LT |
1463 | |
1464 | retval = security_task_setrlimit(resource, &new_rlim); | |
1465 | if (retval) | |
1466 | return retval; | |
1467 | ||
9926e4c7 TA |
1468 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1469 | /* | |
1470 | * The caller is asking for an immediate RLIMIT_CPU | |
1471 | * expiry. But we use the zero value to mean "it was | |
1472 | * never set". So let's cheat and make it one second | |
1473 | * instead | |
1474 | */ | |
1475 | new_rlim.rlim_cur = 1; | |
1476 | } | |
1477 | ||
1da177e4 LT |
1478 | task_lock(current->group_leader); |
1479 | *old_rlim = new_rlim; | |
1480 | task_unlock(current->group_leader); | |
1481 | ||
ec9e16ba AM |
1482 | if (resource != RLIMIT_CPU) |
1483 | goto out; | |
d3561f78 AM |
1484 | |
1485 | /* | |
1486 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1487 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1488 | * very long-standing error, and fixing it now risks breakage of | |
1489 | * applications, so we live with it | |
1490 | */ | |
ec9e16ba AM |
1491 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1492 | goto out; | |
1493 | ||
1494 | it_prof_secs = cputime_to_secs(current->signal->it_prof_expires); | |
1495 | if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) { | |
e0661111 AM |
1496 | unsigned long rlim_cur = new_rlim.rlim_cur; |
1497 | cputime_t cputime; | |
ec9e16ba | 1498 | |
e0661111 | 1499 | cputime = secs_to_cputime(rlim_cur); |
1da177e4 LT |
1500 | read_lock(&tasklist_lock); |
1501 | spin_lock_irq(¤t->sighand->siglock); | |
ec9e16ba | 1502 | set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL); |
1da177e4 LT |
1503 | spin_unlock_irq(¤t->sighand->siglock); |
1504 | read_unlock(&tasklist_lock); | |
1505 | } | |
ec9e16ba | 1506 | out: |
1da177e4 LT |
1507 | return 0; |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * It would make sense to put struct rusage in the task_struct, | |
1512 | * except that would make the task_struct be *really big*. After | |
1513 | * task_struct gets moved into malloc'ed memory, it would | |
1514 | * make sense to do this. It will make moving the rest of the information | |
1515 | * a lot simpler! (Which we're not doing right now because we're not | |
1516 | * measuring them yet). | |
1517 | * | |
1da177e4 LT |
1518 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1519 | * races with threads incrementing their own counters. But since word | |
1520 | * reads are atomic, we either get new values or old values and we don't | |
1521 | * care which for the sums. We always take the siglock to protect reading | |
1522 | * the c* fields from p->signal from races with exit.c updating those | |
1523 | * fields when reaping, so a sample either gets all the additions of a | |
1524 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1525 | * |
de047c1b RT |
1526 | * Locking: |
1527 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1528 | * for the cases current multithreaded, non-current single threaded | |
1529 | * non-current multithreaded. Thread traversal is now safe with | |
1530 | * the siglock held. | |
1531 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1532 | * single threaded, as no one else can take our signal_struct away, no one | |
1533 | * else can reap the children to update signal->c* counters, and no one else | |
1534 | * can race with the signal-> fields. If we do not take any lock, the | |
1535 | * signal-> fields could be read out of order while another thread was just | |
1536 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1537 | * On the writer side, write memory barrier is implied in __exit_signal | |
1538 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1539 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1540 | * |
1da177e4 LT |
1541 | */ |
1542 | ||
679c9cd4 SK |
1543 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r, |
1544 | cputime_t *utimep, cputime_t *stimep) | |
1545 | { | |
1546 | *utimep = cputime_add(*utimep, t->utime); | |
1547 | *stimep = cputime_add(*stimep, t->stime); | |
1548 | r->ru_nvcsw += t->nvcsw; | |
1549 | r->ru_nivcsw += t->nivcsw; | |
1550 | r->ru_minflt += t->min_flt; | |
1551 | r->ru_majflt += t->maj_flt; | |
1552 | r->ru_inblock += task_io_get_inblock(t); | |
1553 | r->ru_oublock += task_io_get_oublock(t); | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1557 | { | |
1558 | struct task_struct *t; | |
1559 | unsigned long flags; | |
1560 | cputime_t utime, stime; | |
1561 | ||
1562 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1563 | utime = stime = cputime_zero; |
1da177e4 | 1564 | |
679c9cd4 SK |
1565 | if (who == RUSAGE_THREAD) { |
1566 | accumulate_thread_rusage(p, r, &utime, &stime); | |
1567 | goto out; | |
1568 | } | |
1569 | ||
d6cf723a | 1570 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1571 | return; |
0f59cc4a | 1572 | |
1da177e4 | 1573 | switch (who) { |
0f59cc4a | 1574 | case RUSAGE_BOTH: |
1da177e4 | 1575 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1576 | utime = p->signal->cutime; |
1577 | stime = p->signal->cstime; | |
1578 | r->ru_nvcsw = p->signal->cnvcsw; | |
1579 | r->ru_nivcsw = p->signal->cnivcsw; | |
1580 | r->ru_minflt = p->signal->cmin_flt; | |
1581 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1582 | r->ru_inblock = p->signal->cinblock; |
1583 | r->ru_oublock = p->signal->coublock; | |
0f59cc4a ON |
1584 | |
1585 | if (who == RUSAGE_CHILDREN) | |
1586 | break; | |
1587 | ||
1da177e4 | 1588 | case RUSAGE_SELF: |
1da177e4 LT |
1589 | utime = cputime_add(utime, p->signal->utime); |
1590 | stime = cputime_add(stime, p->signal->stime); | |
1591 | r->ru_nvcsw += p->signal->nvcsw; | |
1592 | r->ru_nivcsw += p->signal->nivcsw; | |
1593 | r->ru_minflt += p->signal->min_flt; | |
1594 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1595 | r->ru_inblock += p->signal->inblock; |
1596 | r->ru_oublock += p->signal->oublock; | |
1da177e4 LT |
1597 | t = p; |
1598 | do { | |
679c9cd4 | 1599 | accumulate_thread_rusage(t, r, &utime, &stime); |
1da177e4 LT |
1600 | t = next_thread(t); |
1601 | } while (t != p); | |
1da177e4 | 1602 | break; |
0f59cc4a | 1603 | |
1da177e4 LT |
1604 | default: |
1605 | BUG(); | |
1606 | } | |
de047c1b | 1607 | unlock_task_sighand(p, &flags); |
de047c1b | 1608 | |
679c9cd4 | 1609 | out: |
0f59cc4a ON |
1610 | cputime_to_timeval(utime, &r->ru_utime); |
1611 | cputime_to_timeval(stime, &r->ru_stime); | |
1da177e4 LT |
1612 | } |
1613 | ||
1614 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1615 | { | |
1616 | struct rusage r; | |
1da177e4 | 1617 | k_getrusage(p, who, &r); |
1da177e4 LT |
1618 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1619 | } | |
1620 | ||
1621 | asmlinkage long sys_getrusage(int who, struct rusage __user *ru) | |
1622 | { | |
679c9cd4 SK |
1623 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1624 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1625 | return -EINVAL; |
1626 | return getrusage(current, who, ru); | |
1627 | } | |
1628 | ||
1629 | asmlinkage long sys_umask(int mask) | |
1630 | { | |
1631 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1632 | return mask; | |
1633 | } | |
3b7391de | 1634 | |
1da177e4 LT |
1635 | asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, |
1636 | unsigned long arg4, unsigned long arg5) | |
1637 | { | |
7b26655f | 1638 | long error = 0; |
1da177e4 | 1639 | |
3898b1b4 | 1640 | if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error)) |
1da177e4 LT |
1641 | return error; |
1642 | ||
1643 | switch (option) { | |
1644 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1645 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1646 | error = -EINVAL; |
1647 | break; | |
1648 | } | |
0730ded5 | 1649 | current->pdeath_signal = arg2; |
1da177e4 LT |
1650 | break; |
1651 | case PR_GET_PDEATHSIG: | |
1652 | error = put_user(current->pdeath_signal, (int __user *)arg2); | |
1653 | break; | |
1654 | case PR_GET_DUMPABLE: | |
6c5d5238 | 1655 | error = get_dumpable(current->mm); |
1da177e4 LT |
1656 | break; |
1657 | case PR_SET_DUMPABLE: | |
abf75a50 | 1658 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1659 | error = -EINVAL; |
1660 | break; | |
1661 | } | |
6c5d5238 | 1662 | set_dumpable(current->mm, arg2); |
1da177e4 LT |
1663 | break; |
1664 | ||
1665 | case PR_SET_UNALIGN: | |
1666 | error = SET_UNALIGN_CTL(current, arg2); | |
1667 | break; | |
1668 | case PR_GET_UNALIGN: | |
1669 | error = GET_UNALIGN_CTL(current, arg2); | |
1670 | break; | |
1671 | case PR_SET_FPEMU: | |
1672 | error = SET_FPEMU_CTL(current, arg2); | |
1673 | break; | |
1674 | case PR_GET_FPEMU: | |
1675 | error = GET_FPEMU_CTL(current, arg2); | |
1676 | break; | |
1677 | case PR_SET_FPEXC: | |
1678 | error = SET_FPEXC_CTL(current, arg2); | |
1679 | break; | |
1680 | case PR_GET_FPEXC: | |
1681 | error = GET_FPEXC_CTL(current, arg2); | |
1682 | break; | |
1683 | case PR_GET_TIMING: | |
1684 | error = PR_TIMING_STATISTICAL; | |
1685 | break; | |
1686 | case PR_SET_TIMING: | |
7b26655f | 1687 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 LT |
1688 | error = -EINVAL; |
1689 | break; | |
1690 | ||
1da177e4 LT |
1691 | case PR_SET_NAME: { |
1692 | struct task_struct *me = current; | |
1693 | unsigned char ncomm[sizeof(me->comm)]; | |
1694 | ||
1695 | ncomm[sizeof(me->comm)-1] = 0; | |
1696 | if (strncpy_from_user(ncomm, (char __user *)arg2, | |
1697 | sizeof(me->comm)-1) < 0) | |
1698 | return -EFAULT; | |
1699 | set_task_comm(me, ncomm); | |
1700 | return 0; | |
1701 | } | |
1702 | case PR_GET_NAME: { | |
1703 | struct task_struct *me = current; | |
1704 | unsigned char tcomm[sizeof(me->comm)]; | |
1705 | ||
1706 | get_task_comm(tcomm, me); | |
1707 | if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm))) | |
1708 | return -EFAULT; | |
1709 | return 0; | |
1710 | } | |
651d765d AB |
1711 | case PR_GET_ENDIAN: |
1712 | error = GET_ENDIAN(current, arg2); | |
1713 | break; | |
1714 | case PR_SET_ENDIAN: | |
1715 | error = SET_ENDIAN(current, arg2); | |
1716 | break; | |
1717 | ||
1d9d02fe AA |
1718 | case PR_GET_SECCOMP: |
1719 | error = prctl_get_seccomp(); | |
1720 | break; | |
1721 | case PR_SET_SECCOMP: | |
1722 | error = prctl_set_seccomp(arg2); | |
1723 | break; | |
8fb402bc EB |
1724 | case PR_GET_TSC: |
1725 | error = GET_TSC_CTL(arg2); | |
1726 | break; | |
1727 | case PR_SET_TSC: | |
1728 | error = SET_TSC_CTL(arg2); | |
1729 | break; | |
1da177e4 LT |
1730 | default: |
1731 | error = -EINVAL; | |
1732 | break; | |
1733 | } | |
1734 | return error; | |
1735 | } | |
3cfc348b AK |
1736 | |
1737 | asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, | |
4307d1e5 | 1738 | struct getcpu_cache __user *unused) |
3cfc348b AK |
1739 | { |
1740 | int err = 0; | |
1741 | int cpu = raw_smp_processor_id(); | |
1742 | if (cpup) | |
1743 | err |= put_user(cpu, cpup); | |
1744 | if (nodep) | |
1745 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1746 | return err ? -EFAULT : 0; |
1747 | } | |
10a0a8d4 JF |
1748 | |
1749 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1750 | ||
1751 | static void argv_cleanup(char **argv, char **envp) | |
1752 | { | |
1753 | argv_free(argv); | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * orderly_poweroff - Trigger an orderly system poweroff | |
1758 | * @force: force poweroff if command execution fails | |
1759 | * | |
1760 | * This may be called from any context to trigger a system shutdown. | |
1761 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1762 | */ | |
1763 | int orderly_poweroff(bool force) | |
1764 | { | |
1765 | int argc; | |
1766 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1767 | static char *envp[] = { | |
1768 | "HOME=/", | |
1769 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1770 | NULL | |
1771 | }; | |
1772 | int ret = -ENOMEM; | |
1773 | struct subprocess_info *info; | |
1774 | ||
1775 | if (argv == NULL) { | |
1776 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1777 | __func__, poweroff_cmd); | |
1778 | goto out; | |
1779 | } | |
1780 | ||
ac331d15 | 1781 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1782 | if (info == NULL) { |
1783 | argv_free(argv); | |
1784 | goto out; | |
1785 | } | |
1786 | ||
1787 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1788 | ||
86313c48 | 1789 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1790 | |
1791 | out: | |
1792 | if (ret && force) { | |
1793 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1794 | "forcing the issue\n"); | |
1795 | ||
1796 | /* I guess this should try to kick off some daemon to | |
1797 | sync and poweroff asap. Or not even bother syncing | |
1798 | if we're doing an emergency shutdown? */ | |
1799 | emergency_sync(); | |
1800 | kernel_power_off(); | |
1801 | } | |
1802 | ||
1803 | return ret; | |
1804 | } | |
1805 | EXPORT_SYMBOL_GPL(orderly_poweroff); |