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> | |
1da177e4 LT |
11 | #include <linux/notifier.h> |
12 | #include <linux/reboot.h> | |
13 | #include <linux/prctl.h> | |
1da177e4 LT |
14 | #include <linux/highuid.h> |
15 | #include <linux/fs.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> |
1da177e4 LT |
39 | |
40 | #include <linux/compat.h> | |
41 | #include <linux/syscalls.h> | |
00d7c05a | 42 | #include <linux/kprobes.h> |
acce292c | 43 | #include <linux/user_namespace.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
46 | #include <asm/io.h> | |
47 | #include <asm/unistd.h> | |
48 | ||
49 | #ifndef SET_UNALIGN_CTL | |
50 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
51 | #endif | |
52 | #ifndef GET_UNALIGN_CTL | |
53 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
54 | #endif | |
55 | #ifndef SET_FPEMU_CTL | |
56 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
57 | #endif | |
58 | #ifndef GET_FPEMU_CTL | |
59 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
60 | #endif | |
61 | #ifndef SET_FPEXC_CTL | |
62 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
63 | #endif | |
64 | #ifndef GET_FPEXC_CTL | |
65 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
66 | #endif | |
651d765d AB |
67 | #ifndef GET_ENDIAN |
68 | # define GET_ENDIAN(a,b) (-EINVAL) | |
69 | #endif | |
70 | #ifndef SET_ENDIAN | |
71 | # define SET_ENDIAN(a,b) (-EINVAL) | |
72 | #endif | |
8fb402bc EB |
73 | #ifndef GET_TSC_CTL |
74 | # define GET_TSC_CTL(a) (-EINVAL) | |
75 | #endif | |
76 | #ifndef SET_TSC_CTL | |
77 | # define SET_TSC_CTL(a) (-EINVAL) | |
78 | #endif | |
1da177e4 LT |
79 | |
80 | /* | |
81 | * this is where the system-wide overflow UID and GID are defined, for | |
82 | * architectures that now have 32-bit UID/GID but didn't in the past | |
83 | */ | |
84 | ||
85 | int overflowuid = DEFAULT_OVERFLOWUID; | |
86 | int overflowgid = DEFAULT_OVERFLOWGID; | |
87 | ||
88 | #ifdef CONFIG_UID16 | |
89 | EXPORT_SYMBOL(overflowuid); | |
90 | EXPORT_SYMBOL(overflowgid); | |
91 | #endif | |
92 | ||
93 | /* | |
94 | * the same as above, but for filesystems which can only store a 16-bit | |
95 | * UID and GID. as such, this is needed on all architectures | |
96 | */ | |
97 | ||
98 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
99 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
100 | ||
101 | EXPORT_SYMBOL(fs_overflowuid); | |
102 | EXPORT_SYMBOL(fs_overflowgid); | |
103 | ||
104 | /* | |
105 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
106 | */ | |
107 | ||
108 | int C_A_D = 1; | |
9ec52099 CLG |
109 | struct pid *cad_pid; |
110 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 111 | |
bd804eba RW |
112 | /* |
113 | * If set, this is used for preparing the system to power off. | |
114 | */ | |
115 | ||
116 | void (*pm_power_off_prepare)(void); | |
bd804eba | 117 | |
c69e8d9c DH |
118 | /* |
119 | * set the priority of a task | |
120 | * - the caller must hold the RCU read lock | |
121 | */ | |
1da177e4 LT |
122 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
123 | { | |
c69e8d9c | 124 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
1da177e4 LT |
125 | int no_nice; |
126 | ||
c69e8d9c DH |
127 | if (pcred->uid != cred->euid && |
128 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
129 | error = -EPERM; |
130 | goto out; | |
131 | } | |
e43379f1 | 132 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
133 | error = -EACCES; |
134 | goto out; | |
135 | } | |
136 | no_nice = security_task_setnice(p, niceval); | |
137 | if (no_nice) { | |
138 | error = no_nice; | |
139 | goto out; | |
140 | } | |
141 | if (error == -ESRCH) | |
142 | error = 0; | |
143 | set_user_nice(p, niceval); | |
144 | out: | |
145 | return error; | |
146 | } | |
147 | ||
754fe8d2 | 148 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
149 | { |
150 | struct task_struct *g, *p; | |
151 | struct user_struct *user; | |
86a264ab | 152 | const struct cred *cred = current_cred(); |
1da177e4 | 153 | int error = -EINVAL; |
41487c65 | 154 | struct pid *pgrp; |
1da177e4 | 155 | |
3e88c553 | 156 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
157 | goto out; |
158 | ||
159 | /* normalize: avoid signed division (rounding problems) */ | |
160 | error = -ESRCH; | |
161 | if (niceval < -20) | |
162 | niceval = -20; | |
163 | if (niceval > 19) | |
164 | niceval = 19; | |
165 | ||
d4581a23 | 166 | rcu_read_lock(); |
1da177e4 LT |
167 | read_lock(&tasklist_lock); |
168 | switch (which) { | |
169 | case PRIO_PROCESS: | |
41487c65 | 170 | if (who) |
228ebcbe | 171 | p = find_task_by_vpid(who); |
41487c65 EB |
172 | else |
173 | p = current; | |
1da177e4 LT |
174 | if (p) |
175 | error = set_one_prio(p, niceval, error); | |
176 | break; | |
177 | case PRIO_PGRP: | |
41487c65 | 178 | if (who) |
b488893a | 179 | pgrp = find_vpid(who); |
41487c65 EB |
180 | else |
181 | pgrp = task_pgrp(current); | |
2d70b68d | 182 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 183 | error = set_one_prio(p, niceval, error); |
2d70b68d | 184 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
185 | break; |
186 | case PRIO_USER: | |
d84f4f99 | 187 | user = (struct user_struct *) cred->user; |
1da177e4 | 188 | if (!who) |
86a264ab DH |
189 | who = cred->uid; |
190 | else if ((who != cred->uid) && | |
191 | !(user = find_user(who))) | |
192 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 193 | |
dfc6a736 | 194 | do_each_thread(g, p) { |
86a264ab | 195 | if (__task_cred(p)->uid == who) |
1da177e4 | 196 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 197 | } while_each_thread(g, p); |
86a264ab | 198 | if (who != cred->uid) |
1da177e4 LT |
199 | free_uid(user); /* For find_user() */ |
200 | break; | |
201 | } | |
202 | out_unlock: | |
203 | read_unlock(&tasklist_lock); | |
d4581a23 | 204 | rcu_read_unlock(); |
1da177e4 LT |
205 | out: |
206 | return error; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Ugh. To avoid negative return values, "getpriority()" will | |
211 | * not return the normal nice-value, but a negated value that | |
212 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
213 | * to stay compatible. | |
214 | */ | |
754fe8d2 | 215 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
216 | { |
217 | struct task_struct *g, *p; | |
218 | struct user_struct *user; | |
86a264ab | 219 | const struct cred *cred = current_cred(); |
1da177e4 | 220 | long niceval, retval = -ESRCH; |
41487c65 | 221 | struct pid *pgrp; |
1da177e4 | 222 | |
3e88c553 | 223 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
224 | return -EINVAL; |
225 | ||
70118837 | 226 | rcu_read_lock(); |
1da177e4 LT |
227 | read_lock(&tasklist_lock); |
228 | switch (which) { | |
229 | case PRIO_PROCESS: | |
41487c65 | 230 | if (who) |
228ebcbe | 231 | p = find_task_by_vpid(who); |
41487c65 EB |
232 | else |
233 | p = current; | |
1da177e4 LT |
234 | if (p) { |
235 | niceval = 20 - task_nice(p); | |
236 | if (niceval > retval) | |
237 | retval = niceval; | |
238 | } | |
239 | break; | |
240 | case PRIO_PGRP: | |
41487c65 | 241 | if (who) |
b488893a | 242 | pgrp = find_vpid(who); |
41487c65 EB |
243 | else |
244 | pgrp = task_pgrp(current); | |
2d70b68d | 245 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
246 | niceval = 20 - task_nice(p); |
247 | if (niceval > retval) | |
248 | retval = niceval; | |
2d70b68d | 249 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
250 | break; |
251 | case PRIO_USER: | |
86a264ab | 252 | user = (struct user_struct *) cred->user; |
1da177e4 | 253 | if (!who) |
86a264ab DH |
254 | who = cred->uid; |
255 | else if ((who != cred->uid) && | |
256 | !(user = find_user(who))) | |
257 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 258 | |
dfc6a736 | 259 | do_each_thread(g, p) { |
86a264ab | 260 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
261 | niceval = 20 - task_nice(p); |
262 | if (niceval > retval) | |
263 | retval = niceval; | |
264 | } | |
dfc6a736 | 265 | } while_each_thread(g, p); |
86a264ab | 266 | if (who != cred->uid) |
1da177e4 LT |
267 | free_uid(user); /* for find_user() */ |
268 | break; | |
269 | } | |
270 | out_unlock: | |
271 | read_unlock(&tasklist_lock); | |
70118837 | 272 | rcu_read_unlock(); |
1da177e4 LT |
273 | |
274 | return retval; | |
275 | } | |
276 | ||
e4c94330 EB |
277 | /** |
278 | * emergency_restart - reboot the system | |
279 | * | |
280 | * Without shutting down any hardware or taking any locks | |
281 | * reboot the system. This is called when we know we are in | |
282 | * trouble so this is our best effort to reboot. This is | |
283 | * safe to call in interrupt context. | |
284 | */ | |
7c903473 EB |
285 | void emergency_restart(void) |
286 | { | |
287 | machine_emergency_restart(); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(emergency_restart); | |
290 | ||
ca195b7f | 291 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 292 | { |
e041c683 | 293 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 294 | system_state = SYSTEM_RESTART; |
4a00ea1e | 295 | device_shutdown(); |
58b3b71d | 296 | sysdev_shutdown(); |
e4c94330 | 297 | } |
1e5d5331 RD |
298 | |
299 | /** | |
300 | * kernel_restart - reboot the system | |
301 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 302 | * or %NULL |
1e5d5331 RD |
303 | * |
304 | * Shutdown everything and perform a clean reboot. | |
305 | * This is not safe to call in interrupt context. | |
306 | */ | |
e4c94330 EB |
307 | void kernel_restart(char *cmd) |
308 | { | |
309 | kernel_restart_prepare(cmd); | |
756184b7 | 310 | if (!cmd) |
4a00ea1e | 311 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 312 | else |
4a00ea1e | 313 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
314 | machine_restart(cmd); |
315 | } | |
316 | EXPORT_SYMBOL_GPL(kernel_restart); | |
317 | ||
4ef7229f | 318 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 319 | { |
e041c683 | 320 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
321 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
322 | system_state = state; | |
323 | device_shutdown(); | |
324 | } | |
e4c94330 EB |
325 | /** |
326 | * kernel_halt - halt the system | |
327 | * | |
328 | * Shutdown everything and perform a clean system halt. | |
329 | */ | |
e4c94330 EB |
330 | void kernel_halt(void) |
331 | { | |
729b4d4c | 332 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 333 | sysdev_shutdown(); |
4a00ea1e EB |
334 | printk(KERN_EMERG "System halted.\n"); |
335 | machine_halt(); | |
336 | } | |
729b4d4c | 337 | |
4a00ea1e EB |
338 | EXPORT_SYMBOL_GPL(kernel_halt); |
339 | ||
e4c94330 EB |
340 | /** |
341 | * kernel_power_off - power_off the system | |
342 | * | |
343 | * Shutdown everything and perform a clean system power_off. | |
344 | */ | |
e4c94330 EB |
345 | void kernel_power_off(void) |
346 | { | |
729b4d4c | 347 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
348 | if (pm_power_off_prepare) |
349 | pm_power_off_prepare(); | |
4047727e | 350 | disable_nonboot_cpus(); |
58b3b71d | 351 | sysdev_shutdown(); |
4a00ea1e EB |
352 | printk(KERN_EMERG "Power down.\n"); |
353 | machine_power_off(); | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
356 | |
357 | static DEFINE_MUTEX(reboot_mutex); | |
358 | ||
1da177e4 LT |
359 | /* |
360 | * Reboot system call: for obvious reasons only root may call it, | |
361 | * and even root needs to set up some magic numbers in the registers | |
362 | * so that some mistake won't make this reboot the whole machine. | |
363 | * You can also set the meaning of the ctrl-alt-del-key here. | |
364 | * | |
365 | * reboot doesn't sync: do that yourself before calling this. | |
366 | */ | |
754fe8d2 HC |
367 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
368 | void __user *, arg) | |
1da177e4 LT |
369 | { |
370 | char buffer[256]; | |
3d26dcf7 | 371 | int ret = 0; |
1da177e4 LT |
372 | |
373 | /* We only trust the superuser with rebooting the system. */ | |
374 | if (!capable(CAP_SYS_BOOT)) | |
375 | return -EPERM; | |
376 | ||
377 | /* For safety, we require "magic" arguments. */ | |
378 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
379 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
380 | magic2 != LINUX_REBOOT_MAGIC2A && | |
381 | magic2 != LINUX_REBOOT_MAGIC2B && | |
382 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
383 | return -EINVAL; | |
384 | ||
5e38291d EB |
385 | /* Instead of trying to make the power_off code look like |
386 | * halt when pm_power_off is not set do it the easy way. | |
387 | */ | |
388 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
389 | cmd = LINUX_REBOOT_CMD_HALT; | |
390 | ||
6f15fa50 | 391 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
392 | switch (cmd) { |
393 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 394 | kernel_restart(NULL); |
1da177e4 LT |
395 | break; |
396 | ||
397 | case LINUX_REBOOT_CMD_CAD_ON: | |
398 | C_A_D = 1; | |
399 | break; | |
400 | ||
401 | case LINUX_REBOOT_CMD_CAD_OFF: | |
402 | C_A_D = 0; | |
403 | break; | |
404 | ||
405 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 406 | kernel_halt(); |
1da177e4 | 407 | do_exit(0); |
3d26dcf7 | 408 | panic("cannot halt"); |
1da177e4 LT |
409 | |
410 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 411 | kernel_power_off(); |
1da177e4 LT |
412 | do_exit(0); |
413 | break; | |
414 | ||
415 | case LINUX_REBOOT_CMD_RESTART2: | |
416 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
417 | ret = -EFAULT; |
418 | break; | |
1da177e4 LT |
419 | } |
420 | buffer[sizeof(buffer) - 1] = '\0'; | |
421 | ||
4a00ea1e | 422 | kernel_restart(buffer); |
1da177e4 LT |
423 | break; |
424 | ||
3ab83521 | 425 | #ifdef CONFIG_KEXEC |
dc009d92 | 426 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
427 | ret = kernel_kexec(); |
428 | break; | |
3ab83521 | 429 | #endif |
4a00ea1e | 430 | |
b0cb1a19 | 431 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 432 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
433 | ret = hibernate(); |
434 | break; | |
1da177e4 LT |
435 | #endif |
436 | ||
437 | default: | |
3d26dcf7 AK |
438 | ret = -EINVAL; |
439 | break; | |
1da177e4 | 440 | } |
6f15fa50 | 441 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 442 | return ret; |
1da177e4 LT |
443 | } |
444 | ||
65f27f38 | 445 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 446 | { |
abcd9e51 | 447 | kernel_restart(NULL); |
1da177e4 LT |
448 | } |
449 | ||
450 | /* | |
451 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
452 | * As it's called within an interrupt, it may NOT sync: the only choice | |
453 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
454 | */ | |
455 | void ctrl_alt_del(void) | |
456 | { | |
65f27f38 | 457 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
458 | |
459 | if (C_A_D) | |
460 | schedule_work(&cad_work); | |
461 | else | |
9ec52099 | 462 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
463 | } |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Unprivileged users may change the real gid to the effective gid | |
467 | * or vice versa. (BSD-style) | |
468 | * | |
469 | * If you set the real gid at all, or set the effective gid to a value not | |
470 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
471 | * | |
472 | * This makes it possible for a setgid program to completely drop its | |
473 | * privileges, which is often a useful assertion to make when you are doing | |
474 | * a security audit over a program. | |
475 | * | |
476 | * The general idea is that a program which uses just setregid() will be | |
477 | * 100% compatible with BSD. A program which uses just setgid() will be | |
478 | * 100% compatible with POSIX with saved IDs. | |
479 | * | |
480 | * SMP: There are not races, the GIDs are checked only by filesystem | |
481 | * operations (as far as semantic preservation is concerned). | |
482 | */ | |
ae1251ab | 483 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 484 | { |
d84f4f99 DH |
485 | const struct cred *old; |
486 | struct cred *new; | |
1da177e4 LT |
487 | int retval; |
488 | ||
d84f4f99 DH |
489 | new = prepare_creds(); |
490 | if (!new) | |
491 | return -ENOMEM; | |
492 | old = current_cred(); | |
493 | ||
1da177e4 LT |
494 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); |
495 | if (retval) | |
d84f4f99 | 496 | goto error; |
1da177e4 | 497 | |
d84f4f99 | 498 | retval = -EPERM; |
1da177e4 | 499 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
500 | if (old->gid == rgid || |
501 | old->egid == rgid || | |
1da177e4 | 502 | capable(CAP_SETGID)) |
d84f4f99 | 503 | new->gid = rgid; |
1da177e4 | 504 | else |
d84f4f99 | 505 | goto error; |
1da177e4 LT |
506 | } |
507 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
508 | if (old->gid == egid || |
509 | old->egid == egid || | |
510 | old->sgid == egid || | |
1da177e4 | 511 | capable(CAP_SETGID)) |
d84f4f99 | 512 | new->egid = egid; |
756184b7 | 513 | else |
d84f4f99 | 514 | goto error; |
1da177e4 | 515 | } |
d84f4f99 | 516 | |
1da177e4 | 517 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
518 | (egid != (gid_t) -1 && egid != old->gid)) |
519 | new->sgid = new->egid; | |
520 | new->fsgid = new->egid; | |
521 | ||
522 | return commit_creds(new); | |
523 | ||
524 | error: | |
525 | abort_creds(new); | |
526 | return retval; | |
1da177e4 LT |
527 | } |
528 | ||
529 | /* | |
530 | * setgid() is implemented like SysV w/ SAVED_IDS | |
531 | * | |
532 | * SMP: Same implicit races as above. | |
533 | */ | |
ae1251ab | 534 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 535 | { |
d84f4f99 DH |
536 | const struct cred *old; |
537 | struct cred *new; | |
1da177e4 LT |
538 | int retval; |
539 | ||
d84f4f99 DH |
540 | new = prepare_creds(); |
541 | if (!new) | |
542 | return -ENOMEM; | |
543 | old = current_cred(); | |
544 | ||
1da177e4 LT |
545 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); |
546 | if (retval) | |
d84f4f99 | 547 | goto error; |
1da177e4 | 548 | |
d84f4f99 DH |
549 | retval = -EPERM; |
550 | if (capable(CAP_SETGID)) | |
551 | new->gid = new->egid = new->sgid = new->fsgid = gid; | |
552 | else if (gid == old->gid || gid == old->sgid) | |
553 | new->egid = new->fsgid = gid; | |
1da177e4 | 554 | else |
d84f4f99 | 555 | goto error; |
1da177e4 | 556 | |
d84f4f99 DH |
557 | return commit_creds(new); |
558 | ||
559 | error: | |
560 | abort_creds(new); | |
561 | return retval; | |
1da177e4 | 562 | } |
54e99124 | 563 | |
d84f4f99 DH |
564 | /* |
565 | * change the user struct in a credentials set to match the new UID | |
566 | */ | |
567 | static int set_user(struct cred *new) | |
1da177e4 LT |
568 | { |
569 | struct user_struct *new_user; | |
570 | ||
18b6e041 | 571 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
572 | if (!new_user) |
573 | return -EAGAIN; | |
574 | ||
78d7d407 | 575 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
18b6e041 | 576 | new_user != INIT_USER) { |
1da177e4 LT |
577 | free_uid(new_user); |
578 | return -EAGAIN; | |
579 | } | |
580 | ||
d84f4f99 DH |
581 | free_uid(new->user); |
582 | new->user = new_user; | |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
586 | /* | |
587 | * Unprivileged users may change the real uid to the effective uid | |
588 | * or vice versa. (BSD-style) | |
589 | * | |
590 | * If you set the real uid at all, or set the effective uid to a value not | |
591 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
592 | * | |
593 | * This makes it possible for a setuid program to completely drop its | |
594 | * privileges, which is often a useful assertion to make when you are doing | |
595 | * a security audit over a program. | |
596 | * | |
597 | * The general idea is that a program which uses just setreuid() will be | |
598 | * 100% compatible with BSD. A program which uses just setuid() will be | |
599 | * 100% compatible with POSIX with saved IDs. | |
600 | */ | |
ae1251ab | 601 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 602 | { |
d84f4f99 DH |
603 | const struct cred *old; |
604 | struct cred *new; | |
1da177e4 LT |
605 | int retval; |
606 | ||
d84f4f99 DH |
607 | new = prepare_creds(); |
608 | if (!new) | |
609 | return -ENOMEM; | |
610 | old = current_cred(); | |
611 | ||
1da177e4 LT |
612 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); |
613 | if (retval) | |
d84f4f99 | 614 | goto error; |
1da177e4 | 615 | |
d84f4f99 | 616 | retval = -EPERM; |
1da177e4 | 617 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
618 | new->uid = ruid; |
619 | if (old->uid != ruid && | |
620 | old->euid != ruid && | |
1da177e4 | 621 | !capable(CAP_SETUID)) |
d84f4f99 | 622 | goto error; |
1da177e4 LT |
623 | } |
624 | ||
625 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
626 | new->euid = euid; |
627 | if (old->uid != euid && | |
628 | old->euid != euid && | |
629 | old->suid != euid && | |
1da177e4 | 630 | !capable(CAP_SETUID)) |
d84f4f99 | 631 | goto error; |
1da177e4 LT |
632 | } |
633 | ||
54e99124 DG |
634 | if (new->uid != old->uid) { |
635 | retval = set_user(new); | |
636 | if (retval < 0) | |
637 | goto error; | |
638 | } | |
1da177e4 | 639 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
640 | (euid != (uid_t) -1 && euid != old->uid)) |
641 | new->suid = new->euid; | |
642 | new->fsuid = new->euid; | |
1da177e4 | 643 | |
d84f4f99 DH |
644 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
645 | if (retval < 0) | |
646 | goto error; | |
1da177e4 | 647 | |
d84f4f99 | 648 | return commit_creds(new); |
1da177e4 | 649 | |
d84f4f99 DH |
650 | error: |
651 | abort_creds(new); | |
652 | return retval; | |
653 | } | |
1da177e4 LT |
654 | |
655 | /* | |
656 | * setuid() is implemented like SysV with SAVED_IDS | |
657 | * | |
658 | * Note that SAVED_ID's is deficient in that a setuid root program | |
659 | * like sendmail, for example, cannot set its uid to be a normal | |
660 | * user and then switch back, because if you're root, setuid() sets | |
661 | * the saved uid too. If you don't like this, blame the bright people | |
662 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
663 | * will allow a root program to temporarily drop privileges and be able to | |
664 | * regain them by swapping the real and effective uid. | |
665 | */ | |
ae1251ab | 666 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 667 | { |
d84f4f99 DH |
668 | const struct cred *old; |
669 | struct cred *new; | |
1da177e4 LT |
670 | int retval; |
671 | ||
d84f4f99 DH |
672 | new = prepare_creds(); |
673 | if (!new) | |
674 | return -ENOMEM; | |
675 | old = current_cred(); | |
676 | ||
1da177e4 LT |
677 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); |
678 | if (retval) | |
d84f4f99 | 679 | goto error; |
1da177e4 | 680 | |
d84f4f99 | 681 | retval = -EPERM; |
1da177e4 | 682 | if (capable(CAP_SETUID)) { |
d84f4f99 | 683 | new->suid = new->uid = uid; |
54e99124 DG |
684 | if (uid != old->uid) { |
685 | retval = set_user(new); | |
686 | if (retval < 0) | |
687 | goto error; | |
d84f4f99 DH |
688 | } |
689 | } else if (uid != old->uid && uid != new->suid) { | |
690 | goto error; | |
1da177e4 | 691 | } |
1da177e4 | 692 | |
d84f4f99 DH |
693 | new->fsuid = new->euid = uid; |
694 | ||
695 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
696 | if (retval < 0) | |
697 | goto error; | |
1da177e4 | 698 | |
d84f4f99 | 699 | return commit_creds(new); |
1da177e4 | 700 | |
d84f4f99 DH |
701 | error: |
702 | abort_creds(new); | |
703 | return retval; | |
1da177e4 LT |
704 | } |
705 | ||
706 | ||
707 | /* | |
708 | * This function implements a generic ability to update ruid, euid, | |
709 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
710 | */ | |
ae1251ab | 711 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 712 | { |
d84f4f99 DH |
713 | const struct cred *old; |
714 | struct cred *new; | |
1da177e4 LT |
715 | int retval; |
716 | ||
d84f4f99 DH |
717 | new = prepare_creds(); |
718 | if (!new) | |
719 | return -ENOMEM; | |
720 | ||
1da177e4 LT |
721 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); |
722 | if (retval) | |
d84f4f99 DH |
723 | goto error; |
724 | old = current_cred(); | |
1da177e4 | 725 | |
d84f4f99 | 726 | retval = -EPERM; |
1da177e4 | 727 | if (!capable(CAP_SETUID)) { |
d84f4f99 DH |
728 | if (ruid != (uid_t) -1 && ruid != old->uid && |
729 | ruid != old->euid && ruid != old->suid) | |
730 | goto error; | |
731 | if (euid != (uid_t) -1 && euid != old->uid && | |
732 | euid != old->euid && euid != old->suid) | |
733 | goto error; | |
734 | if (suid != (uid_t) -1 && suid != old->uid && | |
735 | suid != old->euid && suid != old->suid) | |
736 | goto error; | |
1da177e4 | 737 | } |
d84f4f99 | 738 | |
1da177e4 | 739 | if (ruid != (uid_t) -1) { |
d84f4f99 | 740 | new->uid = ruid; |
54e99124 DG |
741 | if (ruid != old->uid) { |
742 | retval = set_user(new); | |
743 | if (retval < 0) | |
744 | goto error; | |
745 | } | |
1da177e4 | 746 | } |
d84f4f99 DH |
747 | if (euid != (uid_t) -1) |
748 | new->euid = euid; | |
1da177e4 | 749 | if (suid != (uid_t) -1) |
d84f4f99 DH |
750 | new->suid = suid; |
751 | new->fsuid = new->euid; | |
1da177e4 | 752 | |
d84f4f99 DH |
753 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
754 | if (retval < 0) | |
755 | goto error; | |
1da177e4 | 756 | |
d84f4f99 | 757 | return commit_creds(new); |
1da177e4 | 758 | |
d84f4f99 DH |
759 | error: |
760 | abort_creds(new); | |
761 | return retval; | |
1da177e4 LT |
762 | } |
763 | ||
dbf040d9 | 764 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 765 | { |
86a264ab | 766 | const struct cred *cred = current_cred(); |
1da177e4 LT |
767 | int retval; |
768 | ||
86a264ab DH |
769 | if (!(retval = put_user(cred->uid, ruid)) && |
770 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 771 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
772 | |
773 | return retval; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Same as above, but for rgid, egid, sgid. | |
778 | */ | |
ae1251ab | 779 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 780 | { |
d84f4f99 DH |
781 | const struct cred *old; |
782 | struct cred *new; | |
1da177e4 LT |
783 | int retval; |
784 | ||
d84f4f99 DH |
785 | new = prepare_creds(); |
786 | if (!new) | |
787 | return -ENOMEM; | |
788 | old = current_cred(); | |
789 | ||
1da177e4 LT |
790 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); |
791 | if (retval) | |
d84f4f99 | 792 | goto error; |
1da177e4 | 793 | |
d84f4f99 | 794 | retval = -EPERM; |
1da177e4 | 795 | if (!capable(CAP_SETGID)) { |
d84f4f99 DH |
796 | if (rgid != (gid_t) -1 && rgid != old->gid && |
797 | rgid != old->egid && rgid != old->sgid) | |
798 | goto error; | |
799 | if (egid != (gid_t) -1 && egid != old->gid && | |
800 | egid != old->egid && egid != old->sgid) | |
801 | goto error; | |
802 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
803 | sgid != old->egid && sgid != old->sgid) | |
804 | goto error; | |
1da177e4 | 805 | } |
d84f4f99 | 806 | |
1da177e4 | 807 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
808 | new->gid = rgid; |
809 | if (egid != (gid_t) -1) | |
810 | new->egid = egid; | |
1da177e4 | 811 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
812 | new->sgid = sgid; |
813 | new->fsgid = new->egid; | |
1da177e4 | 814 | |
d84f4f99 DH |
815 | return commit_creds(new); |
816 | ||
817 | error: | |
818 | abort_creds(new); | |
819 | return retval; | |
1da177e4 LT |
820 | } |
821 | ||
dbf040d9 | 822 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 823 | { |
86a264ab | 824 | const struct cred *cred = current_cred(); |
1da177e4 LT |
825 | int retval; |
826 | ||
86a264ab DH |
827 | if (!(retval = put_user(cred->gid, rgid)) && |
828 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 829 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
830 | |
831 | return retval; | |
832 | } | |
833 | ||
834 | ||
835 | /* | |
836 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
837 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
838 | * whatever uid it wants to). It normally shadows "euid", except when | |
839 | * explicitly set by setfsuid() or for access.. | |
840 | */ | |
ae1251ab | 841 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 842 | { |
d84f4f99 DH |
843 | const struct cred *old; |
844 | struct cred *new; | |
845 | uid_t old_fsuid; | |
1da177e4 | 846 | |
d84f4f99 DH |
847 | new = prepare_creds(); |
848 | if (!new) | |
849 | return current_fsuid(); | |
850 | old = current_cred(); | |
851 | old_fsuid = old->fsuid; | |
1da177e4 | 852 | |
d84f4f99 DH |
853 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0) |
854 | goto error; | |
1da177e4 | 855 | |
d84f4f99 DH |
856 | if (uid == old->uid || uid == old->euid || |
857 | uid == old->suid || uid == old->fsuid || | |
756184b7 CP |
858 | capable(CAP_SETUID)) { |
859 | if (uid != old_fsuid) { | |
d84f4f99 DH |
860 | new->fsuid = uid; |
861 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
862 | goto change_okay; | |
1da177e4 | 863 | } |
1da177e4 LT |
864 | } |
865 | ||
d84f4f99 DH |
866 | error: |
867 | abort_creds(new); | |
868 | return old_fsuid; | |
1da177e4 | 869 | |
d84f4f99 DH |
870 | change_okay: |
871 | commit_creds(new); | |
1da177e4 LT |
872 | return old_fsuid; |
873 | } | |
874 | ||
875 | /* | |
f42df9e6 | 876 | * Samma på svenska.. |
1da177e4 | 877 | */ |
ae1251ab | 878 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 879 | { |
d84f4f99 DH |
880 | const struct cred *old; |
881 | struct cred *new; | |
882 | gid_t old_fsgid; | |
883 | ||
884 | new = prepare_creds(); | |
885 | if (!new) | |
886 | return current_fsgid(); | |
887 | old = current_cred(); | |
888 | old_fsgid = old->fsgid; | |
1da177e4 | 889 | |
1da177e4 | 890 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
d84f4f99 | 891 | goto error; |
1da177e4 | 892 | |
d84f4f99 DH |
893 | if (gid == old->gid || gid == old->egid || |
894 | gid == old->sgid || gid == old->fsgid || | |
756184b7 CP |
895 | capable(CAP_SETGID)) { |
896 | if (gid != old_fsgid) { | |
d84f4f99 DH |
897 | new->fsgid = gid; |
898 | goto change_okay; | |
1da177e4 | 899 | } |
1da177e4 | 900 | } |
d84f4f99 DH |
901 | |
902 | error: | |
903 | abort_creds(new); | |
904 | return old_fsgid; | |
905 | ||
906 | change_okay: | |
907 | commit_creds(new); | |
1da177e4 LT |
908 | return old_fsgid; |
909 | } | |
910 | ||
f06febc9 FM |
911 | void do_sys_times(struct tms *tms) |
912 | { | |
0cf55e1e | 913 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 914 | |
2b5fe6de | 915 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 916 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
917 | cutime = current->signal->cutime; |
918 | cstime = current->signal->cstime; | |
919 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
920 | tms->tms_utime = cputime_to_clock_t(tgutime); |
921 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
922 | tms->tms_cutime = cputime_to_clock_t(cutime); |
923 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
924 | } | |
925 | ||
58fd3aa2 | 926 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 927 | { |
1da177e4 LT |
928 | if (tbuf) { |
929 | struct tms tmp; | |
f06febc9 FM |
930 | |
931 | do_sys_times(&tmp); | |
1da177e4 LT |
932 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
933 | return -EFAULT; | |
934 | } | |
e3d5a27d | 935 | force_successful_syscall_return(); |
1da177e4 LT |
936 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
937 | } | |
938 | ||
939 | /* | |
940 | * This needs some heavy checking ... | |
941 | * I just haven't the stomach for it. I also don't fully | |
942 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
943 | * | |
944 | * OK, I think I have the protection semantics right.... this is really | |
945 | * only important on a multi-user system anyway, to make sure one user | |
946 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
947 | * | |
948 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
949 | * LBT 04.03.94 | |
950 | */ | |
b290ebe2 | 951 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
952 | { |
953 | struct task_struct *p; | |
ee0acf90 | 954 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
955 | struct pid *pgrp; |
956 | int err; | |
1da177e4 LT |
957 | |
958 | if (!pid) | |
b488893a | 959 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
960 | if (!pgid) |
961 | pgid = pid; | |
962 | if (pgid < 0) | |
963 | return -EINVAL; | |
964 | ||
965 | /* From this point forward we keep holding onto the tasklist lock | |
966 | * so that our parent does not change from under us. -DaveM | |
967 | */ | |
968 | write_lock_irq(&tasklist_lock); | |
969 | ||
970 | err = -ESRCH; | |
4e021306 | 971 | p = find_task_by_vpid(pid); |
1da177e4 LT |
972 | if (!p) |
973 | goto out; | |
974 | ||
975 | err = -EINVAL; | |
976 | if (!thread_group_leader(p)) | |
977 | goto out; | |
978 | ||
4e021306 | 979 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 980 | err = -EPERM; |
41487c65 | 981 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
982 | goto out; |
983 | err = -EACCES; | |
984 | if (p->did_exec) | |
985 | goto out; | |
986 | } else { | |
987 | err = -ESRCH; | |
ee0acf90 | 988 | if (p != group_leader) |
1da177e4 LT |
989 | goto out; |
990 | } | |
991 | ||
992 | err = -EPERM; | |
993 | if (p->signal->leader) | |
994 | goto out; | |
995 | ||
4e021306 | 996 | pgrp = task_pid(p); |
1da177e4 | 997 | if (pgid != pid) { |
b488893a | 998 | struct task_struct *g; |
1da177e4 | 999 | |
4e021306 ON |
1000 | pgrp = find_vpid(pgid); |
1001 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1002 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1003 | goto out; |
1da177e4 LT |
1004 | } |
1005 | ||
1da177e4 LT |
1006 | err = security_task_setpgid(p, pgid); |
1007 | if (err) | |
1008 | goto out; | |
1009 | ||
1b0f7ffd | 1010 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1011 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1012 | |
1013 | err = 0; | |
1014 | out: | |
1015 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1016 | write_unlock_irq(&tasklist_lock); | |
1017 | return err; | |
1018 | } | |
1019 | ||
dbf040d9 | 1020 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1021 | { |
12a3de0a ON |
1022 | struct task_struct *p; |
1023 | struct pid *grp; | |
1024 | int retval; | |
1025 | ||
1026 | rcu_read_lock(); | |
756184b7 | 1027 | if (!pid) |
12a3de0a | 1028 | grp = task_pgrp(current); |
756184b7 | 1029 | else { |
1da177e4 | 1030 | retval = -ESRCH; |
12a3de0a ON |
1031 | p = find_task_by_vpid(pid); |
1032 | if (!p) | |
1033 | goto out; | |
1034 | grp = task_pgrp(p); | |
1035 | if (!grp) | |
1036 | goto out; | |
1037 | ||
1038 | retval = security_task_getpgid(p); | |
1039 | if (retval) | |
1040 | goto out; | |
1da177e4 | 1041 | } |
12a3de0a ON |
1042 | retval = pid_vnr(grp); |
1043 | out: | |
1044 | rcu_read_unlock(); | |
1045 | return retval; | |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1049 | ||
dbf040d9 | 1050 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1051 | { |
12a3de0a | 1052 | return sys_getpgid(0); |
1da177e4 LT |
1053 | } |
1054 | ||
1055 | #endif | |
1056 | ||
dbf040d9 | 1057 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1058 | { |
1dd768c0 ON |
1059 | struct task_struct *p; |
1060 | struct pid *sid; | |
1061 | int retval; | |
1062 | ||
1063 | rcu_read_lock(); | |
756184b7 | 1064 | if (!pid) |
1dd768c0 | 1065 | sid = task_session(current); |
756184b7 | 1066 | else { |
1da177e4 | 1067 | retval = -ESRCH; |
1dd768c0 ON |
1068 | p = find_task_by_vpid(pid); |
1069 | if (!p) | |
1070 | goto out; | |
1071 | sid = task_session(p); | |
1072 | if (!sid) | |
1073 | goto out; | |
1074 | ||
1075 | retval = security_task_getsid(p); | |
1076 | if (retval) | |
1077 | goto out; | |
1da177e4 | 1078 | } |
1dd768c0 ON |
1079 | retval = pid_vnr(sid); |
1080 | out: | |
1081 | rcu_read_unlock(); | |
1082 | return retval; | |
1da177e4 LT |
1083 | } |
1084 | ||
b290ebe2 | 1085 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1086 | { |
e19f247a | 1087 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1088 | struct pid *sid = task_pid(group_leader); |
1089 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1090 | int err = -EPERM; |
1091 | ||
1da177e4 | 1092 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1093 | /* Fail if I am already a session leader */ |
1094 | if (group_leader->signal->leader) | |
1095 | goto out; | |
1096 | ||
430c6231 ON |
1097 | /* Fail if a process group id already exists that equals the |
1098 | * proposed session id. | |
390e2ff0 | 1099 | */ |
6806aac6 | 1100 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1101 | goto out; |
1102 | ||
e19f247a | 1103 | group_leader->signal->leader = 1; |
8520d7c7 | 1104 | __set_special_pids(sid); |
24ec839c | 1105 | |
9c9f4ded | 1106 | proc_clear_tty(group_leader); |
24ec839c | 1107 | |
e4cc0a9c | 1108 | err = session; |
1da177e4 LT |
1109 | out: |
1110 | write_unlock_irq(&tasklist_lock); | |
0d0df599 CB |
1111 | if (err > 0) |
1112 | proc_sid_connector(group_leader); | |
1da177e4 LT |
1113 | return err; |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | DECLARE_RWSEM(uts_sem); |
1117 | ||
e28cbf22 CH |
1118 | #ifdef COMPAT_UTS_MACHINE |
1119 | #define override_architecture(name) \ | |
1120 | (current->personality == PER_LINUX32 && \ | |
1121 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ | |
1122 | sizeof(COMPAT_UTS_MACHINE))) | |
1123 | #else | |
1124 | #define override_architecture(name) 0 | |
1125 | #endif | |
1126 | ||
e48fbb69 | 1127 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1128 | { |
1129 | int errno = 0; | |
1130 | ||
1131 | down_read(&uts_sem); | |
e9ff3990 | 1132 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1133 | errno = -EFAULT; |
1134 | up_read(&uts_sem); | |
e28cbf22 CH |
1135 | |
1136 | if (!errno && override_architecture(name)) | |
1137 | errno = -EFAULT; | |
1da177e4 LT |
1138 | return errno; |
1139 | } | |
1140 | ||
5cacdb4a CH |
1141 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1142 | /* | |
1143 | * Old cruft | |
1144 | */ | |
1145 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1146 | { | |
1147 | int error = 0; | |
1148 | ||
1149 | if (!name) | |
1150 | return -EFAULT; | |
1151 | ||
1152 | down_read(&uts_sem); | |
1153 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1154 | error = -EFAULT; | |
1155 | up_read(&uts_sem); | |
1156 | ||
1157 | if (!error && override_architecture(name)) | |
1158 | error = -EFAULT; | |
1159 | return error; | |
1160 | } | |
1161 | ||
1162 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1163 | { | |
1164 | int error; | |
1165 | ||
1166 | if (!name) | |
1167 | return -EFAULT; | |
1168 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1169 | return -EFAULT; | |
1170 | ||
1171 | down_read(&uts_sem); | |
1172 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1173 | __OLD_UTS_LEN); | |
1174 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1175 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1176 | __OLD_UTS_LEN); | |
1177 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1178 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1179 | __OLD_UTS_LEN); | |
1180 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1181 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1182 | __OLD_UTS_LEN); | |
1183 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1184 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1185 | __OLD_UTS_LEN); | |
1186 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1187 | up_read(&uts_sem); | |
1188 | ||
1189 | if (!error && override_architecture(name)) | |
1190 | error = -EFAULT; | |
1191 | return error ? -EFAULT : 0; | |
1192 | } | |
1193 | #endif | |
1194 | ||
5a8a82b1 | 1195 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1196 | { |
1197 | int errno; | |
1198 | char tmp[__NEW_UTS_LEN]; | |
1199 | ||
1200 | if (!capable(CAP_SYS_ADMIN)) | |
1201 | return -EPERM; | |
1202 | if (len < 0 || len > __NEW_UTS_LEN) | |
1203 | return -EINVAL; | |
1204 | down_write(&uts_sem); | |
1205 | errno = -EFAULT; | |
1206 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1207 | struct new_utsname *u = utsname(); |
1208 | ||
1209 | memcpy(u->nodename, tmp, len); | |
1210 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1211 | errno = 0; |
1212 | } | |
1213 | up_write(&uts_sem); | |
1214 | return errno; | |
1215 | } | |
1216 | ||
1217 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1218 | ||
5a8a82b1 | 1219 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1220 | { |
1221 | int i, errno; | |
9679e4dd | 1222 | struct new_utsname *u; |
1da177e4 LT |
1223 | |
1224 | if (len < 0) | |
1225 | return -EINVAL; | |
1226 | down_read(&uts_sem); | |
9679e4dd AM |
1227 | u = utsname(); |
1228 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1229 | if (i > len) |
1230 | i = len; | |
1231 | errno = 0; | |
9679e4dd | 1232 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1233 | errno = -EFAULT; |
1234 | up_read(&uts_sem); | |
1235 | return errno; | |
1236 | } | |
1237 | ||
1238 | #endif | |
1239 | ||
1240 | /* | |
1241 | * Only setdomainname; getdomainname can be implemented by calling | |
1242 | * uname() | |
1243 | */ | |
5a8a82b1 | 1244 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1245 | { |
1246 | int errno; | |
1247 | char tmp[__NEW_UTS_LEN]; | |
1248 | ||
1249 | if (!capable(CAP_SYS_ADMIN)) | |
1250 | return -EPERM; | |
1251 | if (len < 0 || len > __NEW_UTS_LEN) | |
1252 | return -EINVAL; | |
1253 | ||
1254 | down_write(&uts_sem); | |
1255 | errno = -EFAULT; | |
1256 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1257 | struct new_utsname *u = utsname(); |
1258 | ||
1259 | memcpy(u->domainname, tmp, len); | |
1260 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1261 | errno = 0; |
1262 | } | |
1263 | up_write(&uts_sem); | |
1264 | return errno; | |
1265 | } | |
1266 | ||
e48fbb69 | 1267 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1268 | { |
1269 | if (resource >= RLIM_NLIMITS) | |
1270 | return -EINVAL; | |
1271 | else { | |
1272 | struct rlimit value; | |
1273 | task_lock(current->group_leader); | |
1274 | value = current->signal->rlim[resource]; | |
1275 | task_unlock(current->group_leader); | |
1276 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1281 | ||
1282 | /* | |
1283 | * Back compatibility for getrlimit. Needed for some apps. | |
1284 | */ | |
1285 | ||
e48fbb69 HC |
1286 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1287 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1288 | { |
1289 | struct rlimit x; | |
1290 | if (resource >= RLIM_NLIMITS) | |
1291 | return -EINVAL; | |
1292 | ||
1293 | task_lock(current->group_leader); | |
1294 | x = current->signal->rlim[resource]; | |
1295 | task_unlock(current->group_leader); | |
756184b7 | 1296 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1297 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1298 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1299 | x.rlim_max = 0x7FFFFFFF; |
1300 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1301 | } | |
1302 | ||
1303 | #endif | |
1304 | ||
e48fbb69 | 1305 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1306 | { |
1307 | struct rlimit new_rlim, *old_rlim; | |
1308 | int retval; | |
1309 | ||
1310 | if (resource >= RLIM_NLIMITS) | |
1311 | return -EINVAL; | |
ec9e16ba | 1312 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1313 | return -EFAULT; |
60fd760f AM |
1314 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
1315 | return -EINVAL; | |
1da177e4 LT |
1316 | old_rlim = current->signal->rlim + resource; |
1317 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1318 | !capable(CAP_SYS_RESOURCE)) | |
1319 | return -EPERM; | |
60fd760f AM |
1320 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
1321 | return -EPERM; | |
1da177e4 LT |
1322 | |
1323 | retval = security_task_setrlimit(resource, &new_rlim); | |
1324 | if (retval) | |
1325 | return retval; | |
1326 | ||
9926e4c7 TA |
1327 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1328 | /* | |
1329 | * The caller is asking for an immediate RLIMIT_CPU | |
1330 | * expiry. But we use the zero value to mean "it was | |
1331 | * never set". So let's cheat and make it one second | |
1332 | * instead | |
1333 | */ | |
1334 | new_rlim.rlim_cur = 1; | |
1335 | } | |
1336 | ||
1da177e4 LT |
1337 | task_lock(current->group_leader); |
1338 | *old_rlim = new_rlim; | |
1339 | task_unlock(current->group_leader); | |
1340 | ||
ec9e16ba AM |
1341 | if (resource != RLIMIT_CPU) |
1342 | goto out; | |
d3561f78 AM |
1343 | |
1344 | /* | |
1345 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1346 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1347 | * very long-standing error, and fixing it now risks breakage of | |
1348 | * applications, so we live with it | |
1349 | */ | |
ec9e16ba AM |
1350 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1351 | goto out; | |
1352 | ||
f06febc9 | 1353 | update_rlimit_cpu(new_rlim.rlim_cur); |
ec9e16ba | 1354 | out: |
1da177e4 LT |
1355 | return 0; |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * It would make sense to put struct rusage in the task_struct, | |
1360 | * except that would make the task_struct be *really big*. After | |
1361 | * task_struct gets moved into malloc'ed memory, it would | |
1362 | * make sense to do this. It will make moving the rest of the information | |
1363 | * a lot simpler! (Which we're not doing right now because we're not | |
1364 | * measuring them yet). | |
1365 | * | |
1da177e4 LT |
1366 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1367 | * races with threads incrementing their own counters. But since word | |
1368 | * reads are atomic, we either get new values or old values and we don't | |
1369 | * care which for the sums. We always take the siglock to protect reading | |
1370 | * the c* fields from p->signal from races with exit.c updating those | |
1371 | * fields when reaping, so a sample either gets all the additions of a | |
1372 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1373 | * |
de047c1b RT |
1374 | * Locking: |
1375 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1376 | * for the cases current multithreaded, non-current single threaded | |
1377 | * non-current multithreaded. Thread traversal is now safe with | |
1378 | * the siglock held. | |
1379 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1380 | * single threaded, as no one else can take our signal_struct away, no one | |
1381 | * else can reap the children to update signal->c* counters, and no one else | |
1382 | * can race with the signal-> fields. If we do not take any lock, the | |
1383 | * signal-> fields could be read out of order while another thread was just | |
1384 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1385 | * On the writer side, write memory barrier is implied in __exit_signal | |
1386 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1387 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1388 | * |
1da177e4 LT |
1389 | */ |
1390 | ||
f06febc9 | 1391 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1392 | { |
679c9cd4 SK |
1393 | r->ru_nvcsw += t->nvcsw; |
1394 | r->ru_nivcsw += t->nivcsw; | |
1395 | r->ru_minflt += t->min_flt; | |
1396 | r->ru_majflt += t->maj_flt; | |
1397 | r->ru_inblock += task_io_get_inblock(t); | |
1398 | r->ru_oublock += task_io_get_oublock(t); | |
1399 | } | |
1400 | ||
1da177e4 LT |
1401 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1402 | { | |
1403 | struct task_struct *t; | |
1404 | unsigned long flags; | |
0cf55e1e | 1405 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1406 | unsigned long maxrss = 0; |
1da177e4 LT |
1407 | |
1408 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1409 | utime = stime = cputime_zero; |
1da177e4 | 1410 | |
679c9cd4 | 1411 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1412 | task_times(current, &utime, &stime); |
f06febc9 | 1413 | accumulate_thread_rusage(p, r); |
1f10206c | 1414 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1415 | goto out; |
1416 | } | |
1417 | ||
d6cf723a | 1418 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1419 | return; |
0f59cc4a | 1420 | |
1da177e4 | 1421 | switch (who) { |
0f59cc4a | 1422 | case RUSAGE_BOTH: |
1da177e4 | 1423 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1424 | utime = p->signal->cutime; |
1425 | stime = p->signal->cstime; | |
1426 | r->ru_nvcsw = p->signal->cnvcsw; | |
1427 | r->ru_nivcsw = p->signal->cnivcsw; | |
1428 | r->ru_minflt = p->signal->cmin_flt; | |
1429 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1430 | r->ru_inblock = p->signal->cinblock; |
1431 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1432 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1433 | |
1434 | if (who == RUSAGE_CHILDREN) | |
1435 | break; | |
1436 | ||
1da177e4 | 1437 | case RUSAGE_SELF: |
0cf55e1e HS |
1438 | thread_group_times(p, &tgutime, &tgstime); |
1439 | utime = cputime_add(utime, tgutime); | |
1440 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1441 | r->ru_nvcsw += p->signal->nvcsw; |
1442 | r->ru_nivcsw += p->signal->nivcsw; | |
1443 | r->ru_minflt += p->signal->min_flt; | |
1444 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1445 | r->ru_inblock += p->signal->inblock; |
1446 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1447 | if (maxrss < p->signal->maxrss) |
1448 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1449 | t = p; |
1450 | do { | |
f06febc9 | 1451 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1452 | t = next_thread(t); |
1453 | } while (t != p); | |
1da177e4 | 1454 | break; |
0f59cc4a | 1455 | |
1da177e4 LT |
1456 | default: |
1457 | BUG(); | |
1458 | } | |
de047c1b | 1459 | unlock_task_sighand(p, &flags); |
de047c1b | 1460 | |
679c9cd4 | 1461 | out: |
0f59cc4a ON |
1462 | cputime_to_timeval(utime, &r->ru_utime); |
1463 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1464 | |
1465 | if (who != RUSAGE_CHILDREN) { | |
1466 | struct mm_struct *mm = get_task_mm(p); | |
1467 | if (mm) { | |
1468 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1469 | mmput(mm); | |
1470 | } | |
1471 | } | |
1472 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1476 | { | |
1477 | struct rusage r; | |
1da177e4 | 1478 | k_getrusage(p, who, &r); |
1da177e4 LT |
1479 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1480 | } | |
1481 | ||
e48fbb69 | 1482 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1483 | { |
679c9cd4 SK |
1484 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1485 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1486 | return -EINVAL; |
1487 | return getrusage(current, who, ru); | |
1488 | } | |
1489 | ||
e48fbb69 | 1490 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1491 | { |
1492 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1493 | return mask; | |
1494 | } | |
3b7391de | 1495 | |
c4ea37c2 HC |
1496 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1497 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1498 | { |
b6dff3ec DH |
1499 | struct task_struct *me = current; |
1500 | unsigned char comm[sizeof(me->comm)]; | |
1501 | long error; | |
1da177e4 | 1502 | |
d84f4f99 DH |
1503 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1504 | if (error != -ENOSYS) | |
1da177e4 LT |
1505 | return error; |
1506 | ||
d84f4f99 | 1507 | error = 0; |
1da177e4 LT |
1508 | switch (option) { |
1509 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1510 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1511 | error = -EINVAL; |
1512 | break; | |
1513 | } | |
b6dff3ec DH |
1514 | me->pdeath_signal = arg2; |
1515 | error = 0; | |
1da177e4 LT |
1516 | break; |
1517 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1518 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1519 | break; |
1520 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1521 | error = get_dumpable(me->mm); |
1da177e4 LT |
1522 | break; |
1523 | case PR_SET_DUMPABLE: | |
abf75a50 | 1524 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1525 | error = -EINVAL; |
1526 | break; | |
1527 | } | |
b6dff3ec DH |
1528 | set_dumpable(me->mm, arg2); |
1529 | error = 0; | |
1da177e4 LT |
1530 | break; |
1531 | ||
1532 | case PR_SET_UNALIGN: | |
b6dff3ec | 1533 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1534 | break; |
1535 | case PR_GET_UNALIGN: | |
b6dff3ec | 1536 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1537 | break; |
1538 | case PR_SET_FPEMU: | |
b6dff3ec | 1539 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1540 | break; |
1541 | case PR_GET_FPEMU: | |
b6dff3ec | 1542 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1543 | break; |
1544 | case PR_SET_FPEXC: | |
b6dff3ec | 1545 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1546 | break; |
1547 | case PR_GET_FPEXC: | |
b6dff3ec | 1548 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1549 | break; |
1550 | case PR_GET_TIMING: | |
1551 | error = PR_TIMING_STATISTICAL; | |
1552 | break; | |
1553 | case PR_SET_TIMING: | |
7b26655f | 1554 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1555 | error = -EINVAL; |
b6dff3ec DH |
1556 | else |
1557 | error = 0; | |
1da177e4 LT |
1558 | break; |
1559 | ||
b6dff3ec DH |
1560 | case PR_SET_NAME: |
1561 | comm[sizeof(me->comm)-1] = 0; | |
1562 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1563 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1564 | return -EFAULT; |
b6dff3ec | 1565 | set_task_comm(me, comm); |
1da177e4 | 1566 | return 0; |
b6dff3ec DH |
1567 | case PR_GET_NAME: |
1568 | get_task_comm(comm, me); | |
1569 | if (copy_to_user((char __user *)arg2, comm, | |
1570 | sizeof(comm))) | |
1da177e4 LT |
1571 | return -EFAULT; |
1572 | return 0; | |
651d765d | 1573 | case PR_GET_ENDIAN: |
b6dff3ec | 1574 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1575 | break; |
1576 | case PR_SET_ENDIAN: | |
b6dff3ec | 1577 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1578 | break; |
1579 | ||
1d9d02fe AA |
1580 | case PR_GET_SECCOMP: |
1581 | error = prctl_get_seccomp(); | |
1582 | break; | |
1583 | case PR_SET_SECCOMP: | |
1584 | error = prctl_set_seccomp(arg2); | |
1585 | break; | |
8fb402bc EB |
1586 | case PR_GET_TSC: |
1587 | error = GET_TSC_CTL(arg2); | |
1588 | break; | |
1589 | case PR_SET_TSC: | |
1590 | error = SET_TSC_CTL(arg2); | |
1591 | break; | |
cdd6c482 IM |
1592 | case PR_TASK_PERF_EVENTS_DISABLE: |
1593 | error = perf_event_task_disable(); | |
1d1c7ddb | 1594 | break; |
cdd6c482 IM |
1595 | case PR_TASK_PERF_EVENTS_ENABLE: |
1596 | error = perf_event_task_enable(); | |
1d1c7ddb | 1597 | break; |
6976675d AV |
1598 | case PR_GET_TIMERSLACK: |
1599 | error = current->timer_slack_ns; | |
1600 | break; | |
1601 | case PR_SET_TIMERSLACK: | |
1602 | if (arg2 <= 0) | |
1603 | current->timer_slack_ns = | |
1604 | current->default_timer_slack_ns; | |
1605 | else | |
1606 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1607 | error = 0; |
6976675d | 1608 | break; |
4db96cf0 AK |
1609 | case PR_MCE_KILL: |
1610 | if (arg4 | arg5) | |
1611 | return -EINVAL; | |
1612 | switch (arg2) { | |
1087e9b4 | 1613 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1614 | if (arg3 != 0) |
1615 | return -EINVAL; | |
1616 | current->flags &= ~PF_MCE_PROCESS; | |
1617 | break; | |
1087e9b4 | 1618 | case PR_MCE_KILL_SET: |
4db96cf0 | 1619 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1620 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1621 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1622 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1623 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1624 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1625 | current->flags &= | |
1626 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1627 | else | |
1628 | return -EINVAL; | |
4db96cf0 AK |
1629 | break; |
1630 | default: | |
1631 | return -EINVAL; | |
1632 | } | |
1633 | error = 0; | |
1634 | break; | |
1087e9b4 AK |
1635 | case PR_MCE_KILL_GET: |
1636 | if (arg2 | arg3 | arg4 | arg5) | |
1637 | return -EINVAL; | |
1638 | if (current->flags & PF_MCE_PROCESS) | |
1639 | error = (current->flags & PF_MCE_EARLY) ? | |
1640 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1641 | else | |
1642 | error = PR_MCE_KILL_DEFAULT; | |
1643 | break; | |
1da177e4 LT |
1644 | default: |
1645 | error = -EINVAL; | |
1646 | break; | |
1647 | } | |
1648 | return error; | |
1649 | } | |
3cfc348b | 1650 | |
836f92ad HC |
1651 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1652 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1653 | { |
1654 | int err = 0; | |
1655 | int cpu = raw_smp_processor_id(); | |
1656 | if (cpup) | |
1657 | err |= put_user(cpu, cpup); | |
1658 | if (nodep) | |
1659 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1660 | return err ? -EFAULT : 0; |
1661 | } | |
10a0a8d4 JF |
1662 | |
1663 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1664 | ||
1665 | static void argv_cleanup(char **argv, char **envp) | |
1666 | { | |
1667 | argv_free(argv); | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * orderly_poweroff - Trigger an orderly system poweroff | |
1672 | * @force: force poweroff if command execution fails | |
1673 | * | |
1674 | * This may be called from any context to trigger a system shutdown. | |
1675 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1676 | */ | |
1677 | int orderly_poweroff(bool force) | |
1678 | { | |
1679 | int argc; | |
1680 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1681 | static char *envp[] = { | |
1682 | "HOME=/", | |
1683 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1684 | NULL | |
1685 | }; | |
1686 | int ret = -ENOMEM; | |
1687 | struct subprocess_info *info; | |
1688 | ||
1689 | if (argv == NULL) { | |
1690 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1691 | __func__, poweroff_cmd); | |
1692 | goto out; | |
1693 | } | |
1694 | ||
ac331d15 | 1695 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1696 | if (info == NULL) { |
1697 | argv_free(argv); | |
1698 | goto out; | |
1699 | } | |
1700 | ||
1701 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1702 | ||
86313c48 | 1703 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1704 | |
1705 | out: | |
1706 | if (ret && force) { | |
1707 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1708 | "forcing the issue\n"); | |
1709 | ||
1710 | /* I guess this should try to kick off some daemon to | |
1711 | sync and poweroff asap. Or not even bother syncing | |
1712 | if we're doing an emergency shutdown? */ | |
1713 | emergency_sync(); | |
1714 | kernel_power_off(); | |
1715 | } | |
1716 | ||
1717 | return ret; | |
1718 | } | |
1719 | EXPORT_SYMBOL_GPL(orderly_poweroff); |