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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
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> |
e3d5a27d | 36 | #include <linux/ptrace.h> |
5ad4e53b | 37 | #include <linux/fs_struct.h> |
1da177e4 LT |
38 | |
39 | #include <linux/compat.h> | |
40 | #include <linux/syscalls.h> | |
00d7c05a | 41 | #include <linux/kprobes.h> |
acce292c | 42 | #include <linux/user_namespace.h> |
1da177e4 LT |
43 | |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/io.h> | |
46 | #include <asm/unistd.h> | |
47 | ||
48 | #ifndef SET_UNALIGN_CTL | |
49 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
50 | #endif | |
51 | #ifndef GET_UNALIGN_CTL | |
52 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
53 | #endif | |
54 | #ifndef SET_FPEMU_CTL | |
55 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
56 | #endif | |
57 | #ifndef GET_FPEMU_CTL | |
58 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
59 | #endif | |
60 | #ifndef SET_FPEXC_CTL | |
61 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
62 | #endif | |
63 | #ifndef GET_FPEXC_CTL | |
64 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
65 | #endif | |
651d765d AB |
66 | #ifndef GET_ENDIAN |
67 | # define GET_ENDIAN(a,b) (-EINVAL) | |
68 | #endif | |
69 | #ifndef SET_ENDIAN | |
70 | # define SET_ENDIAN(a,b) (-EINVAL) | |
71 | #endif | |
8fb402bc EB |
72 | #ifndef GET_TSC_CTL |
73 | # define GET_TSC_CTL(a) (-EINVAL) | |
74 | #endif | |
75 | #ifndef SET_TSC_CTL | |
76 | # define SET_TSC_CTL(a) (-EINVAL) | |
77 | #endif | |
1da177e4 LT |
78 | |
79 | /* | |
80 | * this is where the system-wide overflow UID and GID are defined, for | |
81 | * architectures that now have 32-bit UID/GID but didn't in the past | |
82 | */ | |
83 | ||
84 | int overflowuid = DEFAULT_OVERFLOWUID; | |
85 | int overflowgid = DEFAULT_OVERFLOWGID; | |
86 | ||
87 | #ifdef CONFIG_UID16 | |
88 | EXPORT_SYMBOL(overflowuid); | |
89 | EXPORT_SYMBOL(overflowgid); | |
90 | #endif | |
91 | ||
92 | /* | |
93 | * the same as above, but for filesystems which can only store a 16-bit | |
94 | * UID and GID. as such, this is needed on all architectures | |
95 | */ | |
96 | ||
97 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
98 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
99 | ||
100 | EXPORT_SYMBOL(fs_overflowuid); | |
101 | EXPORT_SYMBOL(fs_overflowgid); | |
102 | ||
103 | /* | |
104 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
105 | */ | |
106 | ||
107 | int C_A_D = 1; | |
9ec52099 CLG |
108 | struct pid *cad_pid; |
109 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 110 | |
bd804eba RW |
111 | /* |
112 | * If set, this is used for preparing the system to power off. | |
113 | */ | |
114 | ||
115 | void (*pm_power_off_prepare)(void); | |
bd804eba | 116 | |
c69e8d9c DH |
117 | /* |
118 | * set the priority of a task | |
119 | * - the caller must hold the RCU read lock | |
120 | */ | |
1da177e4 LT |
121 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
122 | { | |
c69e8d9c | 123 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
1da177e4 LT |
124 | int no_nice; |
125 | ||
c69e8d9c DH |
126 | if (pcred->uid != cred->euid && |
127 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
128 | error = -EPERM; |
129 | goto out; | |
130 | } | |
e43379f1 | 131 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
132 | error = -EACCES; |
133 | goto out; | |
134 | } | |
135 | no_nice = security_task_setnice(p, niceval); | |
136 | if (no_nice) { | |
137 | error = no_nice; | |
138 | goto out; | |
139 | } | |
140 | if (error == -ESRCH) | |
141 | error = 0; | |
142 | set_user_nice(p, niceval); | |
143 | out: | |
144 | return error; | |
145 | } | |
146 | ||
754fe8d2 | 147 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
148 | { |
149 | struct task_struct *g, *p; | |
150 | struct user_struct *user; | |
86a264ab | 151 | const struct cred *cred = current_cred(); |
1da177e4 | 152 | int error = -EINVAL; |
41487c65 | 153 | struct pid *pgrp; |
1da177e4 | 154 | |
3e88c553 | 155 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
156 | goto out; |
157 | ||
158 | /* normalize: avoid signed division (rounding problems) */ | |
159 | error = -ESRCH; | |
160 | if (niceval < -20) | |
161 | niceval = -20; | |
162 | if (niceval > 19) | |
163 | niceval = 19; | |
164 | ||
d4581a23 | 165 | rcu_read_lock(); |
1da177e4 LT |
166 | read_lock(&tasklist_lock); |
167 | switch (which) { | |
168 | case PRIO_PROCESS: | |
41487c65 | 169 | if (who) |
228ebcbe | 170 | p = find_task_by_vpid(who); |
41487c65 EB |
171 | else |
172 | p = current; | |
1da177e4 LT |
173 | if (p) |
174 | error = set_one_prio(p, niceval, error); | |
175 | break; | |
176 | case PRIO_PGRP: | |
41487c65 | 177 | if (who) |
b488893a | 178 | pgrp = find_vpid(who); |
41487c65 EB |
179 | else |
180 | pgrp = task_pgrp(current); | |
2d70b68d | 181 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 182 | error = set_one_prio(p, niceval, error); |
2d70b68d | 183 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
184 | break; |
185 | case PRIO_USER: | |
d84f4f99 | 186 | user = (struct user_struct *) cred->user; |
1da177e4 | 187 | if (!who) |
86a264ab DH |
188 | who = cred->uid; |
189 | else if ((who != cred->uid) && | |
190 | !(user = find_user(who))) | |
191 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 192 | |
dfc6a736 | 193 | do_each_thread(g, p) { |
86a264ab | 194 | if (__task_cred(p)->uid == who) |
1da177e4 | 195 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 196 | } while_each_thread(g, p); |
86a264ab | 197 | if (who != cred->uid) |
1da177e4 LT |
198 | free_uid(user); /* For find_user() */ |
199 | break; | |
200 | } | |
201 | out_unlock: | |
202 | read_unlock(&tasklist_lock); | |
d4581a23 | 203 | rcu_read_unlock(); |
1da177e4 LT |
204 | out: |
205 | return error; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Ugh. To avoid negative return values, "getpriority()" will | |
210 | * not return the normal nice-value, but a negated value that | |
211 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
212 | * to stay compatible. | |
213 | */ | |
754fe8d2 | 214 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
215 | { |
216 | struct task_struct *g, *p; | |
217 | struct user_struct *user; | |
86a264ab | 218 | const struct cred *cred = current_cred(); |
1da177e4 | 219 | long niceval, retval = -ESRCH; |
41487c65 | 220 | struct pid *pgrp; |
1da177e4 | 221 | |
3e88c553 | 222 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
223 | return -EINVAL; |
224 | ||
225 | read_lock(&tasklist_lock); | |
226 | switch (which) { | |
227 | case PRIO_PROCESS: | |
41487c65 | 228 | if (who) |
228ebcbe | 229 | p = find_task_by_vpid(who); |
41487c65 EB |
230 | else |
231 | p = current; | |
1da177e4 LT |
232 | if (p) { |
233 | niceval = 20 - task_nice(p); | |
234 | if (niceval > retval) | |
235 | retval = niceval; | |
236 | } | |
237 | break; | |
238 | case PRIO_PGRP: | |
41487c65 | 239 | if (who) |
b488893a | 240 | pgrp = find_vpid(who); |
41487c65 EB |
241 | else |
242 | pgrp = task_pgrp(current); | |
2d70b68d | 243 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
244 | niceval = 20 - task_nice(p); |
245 | if (niceval > retval) | |
246 | retval = niceval; | |
2d70b68d | 247 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
248 | break; |
249 | case PRIO_USER: | |
86a264ab | 250 | user = (struct user_struct *) cred->user; |
1da177e4 | 251 | if (!who) |
86a264ab DH |
252 | who = cred->uid; |
253 | else if ((who != cred->uid) && | |
254 | !(user = find_user(who))) | |
255 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 256 | |
dfc6a736 | 257 | do_each_thread(g, p) { |
86a264ab | 258 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
259 | niceval = 20 - task_nice(p); |
260 | if (niceval > retval) | |
261 | retval = niceval; | |
262 | } | |
dfc6a736 | 263 | } while_each_thread(g, p); |
86a264ab | 264 | if (who != cred->uid) |
1da177e4 LT |
265 | free_uid(user); /* for find_user() */ |
266 | break; | |
267 | } | |
268 | out_unlock: | |
269 | read_unlock(&tasklist_lock); | |
270 | ||
271 | return retval; | |
272 | } | |
273 | ||
e4c94330 EB |
274 | /** |
275 | * emergency_restart - reboot the system | |
276 | * | |
277 | * Without shutting down any hardware or taking any locks | |
278 | * reboot the system. This is called when we know we are in | |
279 | * trouble so this is our best effort to reboot. This is | |
280 | * safe to call in interrupt context. | |
281 | */ | |
7c903473 EB |
282 | void emergency_restart(void) |
283 | { | |
284 | machine_emergency_restart(); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(emergency_restart); | |
287 | ||
ca195b7f | 288 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 289 | { |
e041c683 | 290 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 291 | system_state = SYSTEM_RESTART; |
4a00ea1e | 292 | device_shutdown(); |
58b3b71d | 293 | sysdev_shutdown(); |
e4c94330 | 294 | } |
1e5d5331 RD |
295 | |
296 | /** | |
297 | * kernel_restart - reboot the system | |
298 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 299 | * or %NULL |
1e5d5331 RD |
300 | * |
301 | * Shutdown everything and perform a clean reboot. | |
302 | * This is not safe to call in interrupt context. | |
303 | */ | |
e4c94330 EB |
304 | void kernel_restart(char *cmd) |
305 | { | |
306 | kernel_restart_prepare(cmd); | |
756184b7 | 307 | if (!cmd) |
4a00ea1e | 308 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 309 | else |
4a00ea1e | 310 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
311 | machine_restart(cmd); |
312 | } | |
313 | EXPORT_SYMBOL_GPL(kernel_restart); | |
314 | ||
4ef7229f | 315 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 316 | { |
e041c683 | 317 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
318 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
319 | system_state = state; | |
320 | device_shutdown(); | |
321 | } | |
e4c94330 EB |
322 | /** |
323 | * kernel_halt - halt the system | |
324 | * | |
325 | * Shutdown everything and perform a clean system halt. | |
326 | */ | |
e4c94330 EB |
327 | void kernel_halt(void) |
328 | { | |
729b4d4c | 329 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 330 | sysdev_shutdown(); |
4a00ea1e EB |
331 | printk(KERN_EMERG "System halted.\n"); |
332 | machine_halt(); | |
333 | } | |
729b4d4c | 334 | |
4a00ea1e EB |
335 | EXPORT_SYMBOL_GPL(kernel_halt); |
336 | ||
e4c94330 EB |
337 | /** |
338 | * kernel_power_off - power_off the system | |
339 | * | |
340 | * Shutdown everything and perform a clean system power_off. | |
341 | */ | |
e4c94330 EB |
342 | void kernel_power_off(void) |
343 | { | |
729b4d4c | 344 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
345 | if (pm_power_off_prepare) |
346 | pm_power_off_prepare(); | |
4047727e | 347 | disable_nonboot_cpus(); |
58b3b71d | 348 | sysdev_shutdown(); |
4a00ea1e EB |
349 | printk(KERN_EMERG "Power down.\n"); |
350 | machine_power_off(); | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
353 | |
354 | static DEFINE_MUTEX(reboot_mutex); | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * Reboot system call: for obvious reasons only root may call it, | |
358 | * and even root needs to set up some magic numbers in the registers | |
359 | * so that some mistake won't make this reboot the whole machine. | |
360 | * You can also set the meaning of the ctrl-alt-del-key here. | |
361 | * | |
362 | * reboot doesn't sync: do that yourself before calling this. | |
363 | */ | |
754fe8d2 HC |
364 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
365 | void __user *, arg) | |
1da177e4 LT |
366 | { |
367 | char buffer[256]; | |
3d26dcf7 | 368 | int ret = 0; |
1da177e4 LT |
369 | |
370 | /* We only trust the superuser with rebooting the system. */ | |
371 | if (!capable(CAP_SYS_BOOT)) | |
372 | return -EPERM; | |
373 | ||
374 | /* For safety, we require "magic" arguments. */ | |
375 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
376 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
377 | magic2 != LINUX_REBOOT_MAGIC2A && | |
378 | magic2 != LINUX_REBOOT_MAGIC2B && | |
379 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
380 | return -EINVAL; | |
381 | ||
5e38291d EB |
382 | /* Instead of trying to make the power_off code look like |
383 | * halt when pm_power_off is not set do it the easy way. | |
384 | */ | |
385 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
386 | cmd = LINUX_REBOOT_CMD_HALT; | |
387 | ||
6f15fa50 | 388 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
389 | switch (cmd) { |
390 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 391 | kernel_restart(NULL); |
1da177e4 LT |
392 | break; |
393 | ||
394 | case LINUX_REBOOT_CMD_CAD_ON: | |
395 | C_A_D = 1; | |
396 | break; | |
397 | ||
398 | case LINUX_REBOOT_CMD_CAD_OFF: | |
399 | C_A_D = 0; | |
400 | break; | |
401 | ||
402 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 403 | kernel_halt(); |
1da177e4 | 404 | do_exit(0); |
3d26dcf7 | 405 | panic("cannot halt"); |
1da177e4 LT |
406 | |
407 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 408 | kernel_power_off(); |
1da177e4 LT |
409 | do_exit(0); |
410 | break; | |
411 | ||
412 | case LINUX_REBOOT_CMD_RESTART2: | |
413 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
414 | ret = -EFAULT; |
415 | break; | |
1da177e4 LT |
416 | } |
417 | buffer[sizeof(buffer) - 1] = '\0'; | |
418 | ||
4a00ea1e | 419 | kernel_restart(buffer); |
1da177e4 LT |
420 | break; |
421 | ||
3ab83521 | 422 | #ifdef CONFIG_KEXEC |
dc009d92 | 423 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
424 | ret = kernel_kexec(); |
425 | break; | |
3ab83521 | 426 | #endif |
4a00ea1e | 427 | |
b0cb1a19 | 428 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 429 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
430 | ret = hibernate(); |
431 | break; | |
1da177e4 LT |
432 | #endif |
433 | ||
434 | default: | |
3d26dcf7 AK |
435 | ret = -EINVAL; |
436 | break; | |
1da177e4 | 437 | } |
6f15fa50 | 438 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 439 | return ret; |
1da177e4 LT |
440 | } |
441 | ||
65f27f38 | 442 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 443 | { |
abcd9e51 | 444 | kernel_restart(NULL); |
1da177e4 LT |
445 | } |
446 | ||
447 | /* | |
448 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
449 | * As it's called within an interrupt, it may NOT sync: the only choice | |
450 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
451 | */ | |
452 | void ctrl_alt_del(void) | |
453 | { | |
65f27f38 | 454 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
455 | |
456 | if (C_A_D) | |
457 | schedule_work(&cad_work); | |
458 | else | |
9ec52099 | 459 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | /* |
463 | * Unprivileged users may change the real gid to the effective gid | |
464 | * or vice versa. (BSD-style) | |
465 | * | |
466 | * If you set the real gid at all, or set the effective gid to a value not | |
467 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
468 | * | |
469 | * This makes it possible for a setgid program to completely drop its | |
470 | * privileges, which is often a useful assertion to make when you are doing | |
471 | * a security audit over a program. | |
472 | * | |
473 | * The general idea is that a program which uses just setregid() will be | |
474 | * 100% compatible with BSD. A program which uses just setgid() will be | |
475 | * 100% compatible with POSIX with saved IDs. | |
476 | * | |
477 | * SMP: There are not races, the GIDs are checked only by filesystem | |
478 | * operations (as far as semantic preservation is concerned). | |
479 | */ | |
ae1251ab | 480 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 481 | { |
d84f4f99 DH |
482 | const struct cred *old; |
483 | struct cred *new; | |
1da177e4 LT |
484 | int retval; |
485 | ||
d84f4f99 DH |
486 | new = prepare_creds(); |
487 | if (!new) | |
488 | return -ENOMEM; | |
489 | old = current_cred(); | |
490 | ||
1da177e4 LT |
491 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); |
492 | if (retval) | |
d84f4f99 | 493 | goto error; |
1da177e4 | 494 | |
d84f4f99 | 495 | retval = -EPERM; |
1da177e4 | 496 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
497 | if (old->gid == rgid || |
498 | old->egid == rgid || | |
1da177e4 | 499 | capable(CAP_SETGID)) |
d84f4f99 | 500 | new->gid = rgid; |
1da177e4 | 501 | else |
d84f4f99 | 502 | goto error; |
1da177e4 LT |
503 | } |
504 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
505 | if (old->gid == egid || |
506 | old->egid == egid || | |
507 | old->sgid == egid || | |
1da177e4 | 508 | capable(CAP_SETGID)) |
d84f4f99 | 509 | new->egid = egid; |
756184b7 | 510 | else |
d84f4f99 | 511 | goto error; |
1da177e4 | 512 | } |
d84f4f99 | 513 | |
1da177e4 | 514 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
515 | (egid != (gid_t) -1 && egid != old->gid)) |
516 | new->sgid = new->egid; | |
517 | new->fsgid = new->egid; | |
518 | ||
519 | return commit_creds(new); | |
520 | ||
521 | error: | |
522 | abort_creds(new); | |
523 | return retval; | |
1da177e4 LT |
524 | } |
525 | ||
526 | /* | |
527 | * setgid() is implemented like SysV w/ SAVED_IDS | |
528 | * | |
529 | * SMP: Same implicit races as above. | |
530 | */ | |
ae1251ab | 531 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 532 | { |
d84f4f99 DH |
533 | const struct cred *old; |
534 | struct cred *new; | |
1da177e4 LT |
535 | int retval; |
536 | ||
d84f4f99 DH |
537 | new = prepare_creds(); |
538 | if (!new) | |
539 | return -ENOMEM; | |
540 | old = current_cred(); | |
541 | ||
1da177e4 LT |
542 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); |
543 | if (retval) | |
d84f4f99 | 544 | goto error; |
1da177e4 | 545 | |
d84f4f99 DH |
546 | retval = -EPERM; |
547 | if (capable(CAP_SETGID)) | |
548 | new->gid = new->egid = new->sgid = new->fsgid = gid; | |
549 | else if (gid == old->gid || gid == old->sgid) | |
550 | new->egid = new->fsgid = gid; | |
1da177e4 | 551 | else |
d84f4f99 | 552 | goto error; |
1da177e4 | 553 | |
d84f4f99 DH |
554 | return commit_creds(new); |
555 | ||
556 | error: | |
557 | abort_creds(new); | |
558 | return retval; | |
1da177e4 | 559 | } |
54e99124 | 560 | |
d84f4f99 DH |
561 | /* |
562 | * change the user struct in a credentials set to match the new UID | |
563 | */ | |
564 | static int set_user(struct cred *new) | |
1da177e4 LT |
565 | { |
566 | struct user_struct *new_user; | |
567 | ||
18b6e041 | 568 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
569 | if (!new_user) |
570 | return -EAGAIN; | |
571 | ||
54e99124 DG |
572 | if (!task_can_switch_user(new_user, current)) { |
573 | free_uid(new_user); | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
1da177e4 LT |
577 | if (atomic_read(&new_user->processes) >= |
578 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
18b6e041 | 579 | new_user != INIT_USER) { |
1da177e4 LT |
580 | free_uid(new_user); |
581 | return -EAGAIN; | |
582 | } | |
583 | ||
d84f4f99 DH |
584 | free_uid(new->user); |
585 | new->user = new_user; | |
1da177e4 LT |
586 | return 0; |
587 | } | |
588 | ||
589 | /* | |
590 | * Unprivileged users may change the real uid to the effective uid | |
591 | * or vice versa. (BSD-style) | |
592 | * | |
593 | * If you set the real uid at all, or set the effective uid to a value not | |
594 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
595 | * | |
596 | * This makes it possible for a setuid program to completely drop its | |
597 | * privileges, which is often a useful assertion to make when you are doing | |
598 | * a security audit over a program. | |
599 | * | |
600 | * The general idea is that a program which uses just setreuid() will be | |
601 | * 100% compatible with BSD. A program which uses just setuid() will be | |
602 | * 100% compatible with POSIX with saved IDs. | |
603 | */ | |
ae1251ab | 604 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 605 | { |
d84f4f99 DH |
606 | const struct cred *old; |
607 | struct cred *new; | |
1da177e4 LT |
608 | int retval; |
609 | ||
d84f4f99 DH |
610 | new = prepare_creds(); |
611 | if (!new) | |
612 | return -ENOMEM; | |
613 | old = current_cred(); | |
614 | ||
1da177e4 LT |
615 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); |
616 | if (retval) | |
d84f4f99 | 617 | goto error; |
1da177e4 | 618 | |
d84f4f99 | 619 | retval = -EPERM; |
1da177e4 | 620 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
621 | new->uid = ruid; |
622 | if (old->uid != ruid && | |
623 | old->euid != ruid && | |
1da177e4 | 624 | !capable(CAP_SETUID)) |
d84f4f99 | 625 | goto error; |
1da177e4 LT |
626 | } |
627 | ||
628 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
629 | new->euid = euid; |
630 | if (old->uid != euid && | |
631 | old->euid != euid && | |
632 | old->suid != euid && | |
1da177e4 | 633 | !capable(CAP_SETUID)) |
d84f4f99 | 634 | goto error; |
1da177e4 LT |
635 | } |
636 | ||
54e99124 DG |
637 | if (new->uid != old->uid) { |
638 | retval = set_user(new); | |
639 | if (retval < 0) | |
640 | goto error; | |
641 | } | |
1da177e4 | 642 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
643 | (euid != (uid_t) -1 && euid != old->uid)) |
644 | new->suid = new->euid; | |
645 | new->fsuid = new->euid; | |
1da177e4 | 646 | |
d84f4f99 DH |
647 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
648 | if (retval < 0) | |
649 | goto error; | |
1da177e4 | 650 | |
d84f4f99 | 651 | return commit_creds(new); |
1da177e4 | 652 | |
d84f4f99 DH |
653 | error: |
654 | abort_creds(new); | |
655 | return retval; | |
656 | } | |
1da177e4 LT |
657 | |
658 | /* | |
659 | * setuid() is implemented like SysV with SAVED_IDS | |
660 | * | |
661 | * Note that SAVED_ID's is deficient in that a setuid root program | |
662 | * like sendmail, for example, cannot set its uid to be a normal | |
663 | * user and then switch back, because if you're root, setuid() sets | |
664 | * the saved uid too. If you don't like this, blame the bright people | |
665 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
666 | * will allow a root program to temporarily drop privileges and be able to | |
667 | * regain them by swapping the real and effective uid. | |
668 | */ | |
ae1251ab | 669 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 670 | { |
d84f4f99 DH |
671 | const struct cred *old; |
672 | struct cred *new; | |
1da177e4 LT |
673 | int retval; |
674 | ||
d84f4f99 DH |
675 | new = prepare_creds(); |
676 | if (!new) | |
677 | return -ENOMEM; | |
678 | old = current_cred(); | |
679 | ||
1da177e4 LT |
680 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); |
681 | if (retval) | |
d84f4f99 | 682 | goto error; |
1da177e4 | 683 | |
d84f4f99 | 684 | retval = -EPERM; |
1da177e4 | 685 | if (capable(CAP_SETUID)) { |
d84f4f99 | 686 | new->suid = new->uid = uid; |
54e99124 DG |
687 | if (uid != old->uid) { |
688 | retval = set_user(new); | |
689 | if (retval < 0) | |
690 | goto error; | |
d84f4f99 DH |
691 | } |
692 | } else if (uid != old->uid && uid != new->suid) { | |
693 | goto error; | |
1da177e4 | 694 | } |
1da177e4 | 695 | |
d84f4f99 DH |
696 | new->fsuid = new->euid = uid; |
697 | ||
698 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
699 | if (retval < 0) | |
700 | goto error; | |
1da177e4 | 701 | |
d84f4f99 | 702 | return commit_creds(new); |
1da177e4 | 703 | |
d84f4f99 DH |
704 | error: |
705 | abort_creds(new); | |
706 | return retval; | |
1da177e4 LT |
707 | } |
708 | ||
709 | ||
710 | /* | |
711 | * This function implements a generic ability to update ruid, euid, | |
712 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
713 | */ | |
ae1251ab | 714 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 715 | { |
d84f4f99 DH |
716 | const struct cred *old; |
717 | struct cred *new; | |
1da177e4 LT |
718 | int retval; |
719 | ||
d84f4f99 DH |
720 | new = prepare_creds(); |
721 | if (!new) | |
722 | return -ENOMEM; | |
723 | ||
1da177e4 LT |
724 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); |
725 | if (retval) | |
d84f4f99 DH |
726 | goto error; |
727 | old = current_cred(); | |
1da177e4 | 728 | |
d84f4f99 | 729 | retval = -EPERM; |
1da177e4 | 730 | if (!capable(CAP_SETUID)) { |
d84f4f99 DH |
731 | if (ruid != (uid_t) -1 && ruid != old->uid && |
732 | ruid != old->euid && ruid != old->suid) | |
733 | goto error; | |
734 | if (euid != (uid_t) -1 && euid != old->uid && | |
735 | euid != old->euid && euid != old->suid) | |
736 | goto error; | |
737 | if (suid != (uid_t) -1 && suid != old->uid && | |
738 | suid != old->euid && suid != old->suid) | |
739 | goto error; | |
1da177e4 | 740 | } |
d84f4f99 | 741 | |
1da177e4 | 742 | if (ruid != (uid_t) -1) { |
d84f4f99 | 743 | new->uid = ruid; |
54e99124 DG |
744 | if (ruid != old->uid) { |
745 | retval = set_user(new); | |
746 | if (retval < 0) | |
747 | goto error; | |
748 | } | |
1da177e4 | 749 | } |
d84f4f99 DH |
750 | if (euid != (uid_t) -1) |
751 | new->euid = euid; | |
1da177e4 | 752 | if (suid != (uid_t) -1) |
d84f4f99 DH |
753 | new->suid = suid; |
754 | new->fsuid = new->euid; | |
1da177e4 | 755 | |
d84f4f99 DH |
756 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
757 | if (retval < 0) | |
758 | goto error; | |
1da177e4 | 759 | |
d84f4f99 | 760 | return commit_creds(new); |
1da177e4 | 761 | |
d84f4f99 DH |
762 | error: |
763 | abort_creds(new); | |
764 | return retval; | |
1da177e4 LT |
765 | } |
766 | ||
dbf040d9 | 767 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 768 | { |
86a264ab | 769 | const struct cred *cred = current_cred(); |
1da177e4 LT |
770 | int retval; |
771 | ||
86a264ab DH |
772 | if (!(retval = put_user(cred->uid, ruid)) && |
773 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 774 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
775 | |
776 | return retval; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Same as above, but for rgid, egid, sgid. | |
781 | */ | |
ae1251ab | 782 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 783 | { |
d84f4f99 DH |
784 | const struct cred *old; |
785 | struct cred *new; | |
1da177e4 LT |
786 | int retval; |
787 | ||
d84f4f99 DH |
788 | new = prepare_creds(); |
789 | if (!new) | |
790 | return -ENOMEM; | |
791 | old = current_cred(); | |
792 | ||
1da177e4 LT |
793 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); |
794 | if (retval) | |
d84f4f99 | 795 | goto error; |
1da177e4 | 796 | |
d84f4f99 | 797 | retval = -EPERM; |
1da177e4 | 798 | if (!capable(CAP_SETGID)) { |
d84f4f99 DH |
799 | if (rgid != (gid_t) -1 && rgid != old->gid && |
800 | rgid != old->egid && rgid != old->sgid) | |
801 | goto error; | |
802 | if (egid != (gid_t) -1 && egid != old->gid && | |
803 | egid != old->egid && egid != old->sgid) | |
804 | goto error; | |
805 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
806 | sgid != old->egid && sgid != old->sgid) | |
807 | goto error; | |
1da177e4 | 808 | } |
d84f4f99 | 809 | |
1da177e4 | 810 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
811 | new->gid = rgid; |
812 | if (egid != (gid_t) -1) | |
813 | new->egid = egid; | |
1da177e4 | 814 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
815 | new->sgid = sgid; |
816 | new->fsgid = new->egid; | |
1da177e4 | 817 | |
d84f4f99 DH |
818 | return commit_creds(new); |
819 | ||
820 | error: | |
821 | abort_creds(new); | |
822 | return retval; | |
1da177e4 LT |
823 | } |
824 | ||
dbf040d9 | 825 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 826 | { |
86a264ab | 827 | const struct cred *cred = current_cred(); |
1da177e4 LT |
828 | int retval; |
829 | ||
86a264ab DH |
830 | if (!(retval = put_user(cred->gid, rgid)) && |
831 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 832 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
833 | |
834 | return retval; | |
835 | } | |
836 | ||
837 | ||
838 | /* | |
839 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
840 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
841 | * whatever uid it wants to). It normally shadows "euid", except when | |
842 | * explicitly set by setfsuid() or for access.. | |
843 | */ | |
ae1251ab | 844 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 845 | { |
d84f4f99 DH |
846 | const struct cred *old; |
847 | struct cred *new; | |
848 | uid_t old_fsuid; | |
1da177e4 | 849 | |
d84f4f99 DH |
850 | new = prepare_creds(); |
851 | if (!new) | |
852 | return current_fsuid(); | |
853 | old = current_cred(); | |
854 | old_fsuid = old->fsuid; | |
1da177e4 | 855 | |
d84f4f99 DH |
856 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0) |
857 | goto error; | |
1da177e4 | 858 | |
d84f4f99 DH |
859 | if (uid == old->uid || uid == old->euid || |
860 | uid == old->suid || uid == old->fsuid || | |
756184b7 CP |
861 | capable(CAP_SETUID)) { |
862 | if (uid != old_fsuid) { | |
d84f4f99 DH |
863 | new->fsuid = uid; |
864 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
865 | goto change_okay; | |
1da177e4 | 866 | } |
1da177e4 LT |
867 | } |
868 | ||
d84f4f99 DH |
869 | error: |
870 | abort_creds(new); | |
871 | return old_fsuid; | |
1da177e4 | 872 | |
d84f4f99 DH |
873 | change_okay: |
874 | commit_creds(new); | |
1da177e4 LT |
875 | return old_fsuid; |
876 | } | |
877 | ||
878 | /* | |
f42df9e6 | 879 | * Samma på svenska.. |
1da177e4 | 880 | */ |
ae1251ab | 881 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 882 | { |
d84f4f99 DH |
883 | const struct cred *old; |
884 | struct cred *new; | |
885 | gid_t old_fsgid; | |
886 | ||
887 | new = prepare_creds(); | |
888 | if (!new) | |
889 | return current_fsgid(); | |
890 | old = current_cred(); | |
891 | old_fsgid = old->fsgid; | |
1da177e4 | 892 | |
1da177e4 | 893 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
d84f4f99 | 894 | goto error; |
1da177e4 | 895 | |
d84f4f99 DH |
896 | if (gid == old->gid || gid == old->egid || |
897 | gid == old->sgid || gid == old->fsgid || | |
756184b7 CP |
898 | capable(CAP_SETGID)) { |
899 | if (gid != old_fsgid) { | |
d84f4f99 DH |
900 | new->fsgid = gid; |
901 | goto change_okay; | |
1da177e4 | 902 | } |
1da177e4 | 903 | } |
d84f4f99 DH |
904 | |
905 | error: | |
906 | abort_creds(new); | |
907 | return old_fsgid; | |
908 | ||
909 | change_okay: | |
910 | commit_creds(new); | |
1da177e4 LT |
911 | return old_fsgid; |
912 | } | |
913 | ||
f06febc9 FM |
914 | void do_sys_times(struct tms *tms) |
915 | { | |
0cf55e1e | 916 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 917 | |
2b5fe6de | 918 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 919 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
920 | cutime = current->signal->cutime; |
921 | cstime = current->signal->cstime; | |
922 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
923 | tms->tms_utime = cputime_to_clock_t(tgutime); |
924 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
925 | tms->tms_cutime = cputime_to_clock_t(cutime); |
926 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
927 | } | |
928 | ||
58fd3aa2 | 929 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 930 | { |
1da177e4 LT |
931 | if (tbuf) { |
932 | struct tms tmp; | |
f06febc9 FM |
933 | |
934 | do_sys_times(&tmp); | |
1da177e4 LT |
935 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
936 | return -EFAULT; | |
937 | } | |
e3d5a27d | 938 | force_successful_syscall_return(); |
1da177e4 LT |
939 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
940 | } | |
941 | ||
942 | /* | |
943 | * This needs some heavy checking ... | |
944 | * I just haven't the stomach for it. I also don't fully | |
945 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
946 | * | |
947 | * OK, I think I have the protection semantics right.... this is really | |
948 | * only important on a multi-user system anyway, to make sure one user | |
949 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
950 | * | |
951 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
952 | * LBT 04.03.94 | |
953 | */ | |
b290ebe2 | 954 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
955 | { |
956 | struct task_struct *p; | |
ee0acf90 | 957 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
958 | struct pid *pgrp; |
959 | int err; | |
1da177e4 LT |
960 | |
961 | if (!pid) | |
b488893a | 962 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
963 | if (!pgid) |
964 | pgid = pid; | |
965 | if (pgid < 0) | |
966 | return -EINVAL; | |
967 | ||
968 | /* From this point forward we keep holding onto the tasklist lock | |
969 | * so that our parent does not change from under us. -DaveM | |
970 | */ | |
971 | write_lock_irq(&tasklist_lock); | |
972 | ||
973 | err = -ESRCH; | |
4e021306 | 974 | p = find_task_by_vpid(pid); |
1da177e4 LT |
975 | if (!p) |
976 | goto out; | |
977 | ||
978 | err = -EINVAL; | |
979 | if (!thread_group_leader(p)) | |
980 | goto out; | |
981 | ||
4e021306 | 982 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 983 | err = -EPERM; |
41487c65 | 984 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
985 | goto out; |
986 | err = -EACCES; | |
987 | if (p->did_exec) | |
988 | goto out; | |
989 | } else { | |
990 | err = -ESRCH; | |
ee0acf90 | 991 | if (p != group_leader) |
1da177e4 LT |
992 | goto out; |
993 | } | |
994 | ||
995 | err = -EPERM; | |
996 | if (p->signal->leader) | |
997 | goto out; | |
998 | ||
4e021306 | 999 | pgrp = task_pid(p); |
1da177e4 | 1000 | if (pgid != pid) { |
b488893a | 1001 | struct task_struct *g; |
1da177e4 | 1002 | |
4e021306 ON |
1003 | pgrp = find_vpid(pgid); |
1004 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1005 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1006 | goto out; |
1da177e4 LT |
1007 | } |
1008 | ||
1da177e4 LT |
1009 | err = security_task_setpgid(p, pgid); |
1010 | if (err) | |
1011 | goto out; | |
1012 | ||
1b0f7ffd | 1013 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1014 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1015 | |
1016 | err = 0; | |
1017 | out: | |
1018 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1019 | write_unlock_irq(&tasklist_lock); | |
1020 | return err; | |
1021 | } | |
1022 | ||
dbf040d9 | 1023 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1024 | { |
12a3de0a ON |
1025 | struct task_struct *p; |
1026 | struct pid *grp; | |
1027 | int retval; | |
1028 | ||
1029 | rcu_read_lock(); | |
756184b7 | 1030 | if (!pid) |
12a3de0a | 1031 | grp = task_pgrp(current); |
756184b7 | 1032 | else { |
1da177e4 | 1033 | retval = -ESRCH; |
12a3de0a ON |
1034 | p = find_task_by_vpid(pid); |
1035 | if (!p) | |
1036 | goto out; | |
1037 | grp = task_pgrp(p); | |
1038 | if (!grp) | |
1039 | goto out; | |
1040 | ||
1041 | retval = security_task_getpgid(p); | |
1042 | if (retval) | |
1043 | goto out; | |
1da177e4 | 1044 | } |
12a3de0a ON |
1045 | retval = pid_vnr(grp); |
1046 | out: | |
1047 | rcu_read_unlock(); | |
1048 | return retval; | |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1052 | ||
dbf040d9 | 1053 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1054 | { |
12a3de0a | 1055 | return sys_getpgid(0); |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | #endif | |
1059 | ||
dbf040d9 | 1060 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1061 | { |
1dd768c0 ON |
1062 | struct task_struct *p; |
1063 | struct pid *sid; | |
1064 | int retval; | |
1065 | ||
1066 | rcu_read_lock(); | |
756184b7 | 1067 | if (!pid) |
1dd768c0 | 1068 | sid = task_session(current); |
756184b7 | 1069 | else { |
1da177e4 | 1070 | retval = -ESRCH; |
1dd768c0 ON |
1071 | p = find_task_by_vpid(pid); |
1072 | if (!p) | |
1073 | goto out; | |
1074 | sid = task_session(p); | |
1075 | if (!sid) | |
1076 | goto out; | |
1077 | ||
1078 | retval = security_task_getsid(p); | |
1079 | if (retval) | |
1080 | goto out; | |
1da177e4 | 1081 | } |
1dd768c0 ON |
1082 | retval = pid_vnr(sid); |
1083 | out: | |
1084 | rcu_read_unlock(); | |
1085 | return retval; | |
1da177e4 LT |
1086 | } |
1087 | ||
b290ebe2 | 1088 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1089 | { |
e19f247a | 1090 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1091 | struct pid *sid = task_pid(group_leader); |
1092 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1093 | int err = -EPERM; |
1094 | ||
1da177e4 | 1095 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1096 | /* Fail if I am already a session leader */ |
1097 | if (group_leader->signal->leader) | |
1098 | goto out; | |
1099 | ||
430c6231 ON |
1100 | /* Fail if a process group id already exists that equals the |
1101 | * proposed session id. | |
390e2ff0 | 1102 | */ |
6806aac6 | 1103 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1104 | goto out; |
1105 | ||
e19f247a | 1106 | group_leader->signal->leader = 1; |
8520d7c7 | 1107 | __set_special_pids(sid); |
24ec839c | 1108 | |
9c9f4ded | 1109 | proc_clear_tty(group_leader); |
24ec839c | 1110 | |
e4cc0a9c | 1111 | err = session; |
1da177e4 LT |
1112 | out: |
1113 | write_unlock_irq(&tasklist_lock); | |
0d0df599 CB |
1114 | if (err > 0) |
1115 | proc_sid_connector(group_leader); | |
1da177e4 LT |
1116 | return err; |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | DECLARE_RWSEM(uts_sem); |
1120 | ||
e48fbb69 | 1121 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1122 | { |
1123 | int errno = 0; | |
1124 | ||
1125 | down_read(&uts_sem); | |
e9ff3990 | 1126 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1127 | errno = -EFAULT; |
1128 | up_read(&uts_sem); | |
1129 | return errno; | |
1130 | } | |
1131 | ||
5a8a82b1 | 1132 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1133 | { |
1134 | int errno; | |
1135 | char tmp[__NEW_UTS_LEN]; | |
1136 | ||
1137 | if (!capable(CAP_SYS_ADMIN)) | |
1138 | return -EPERM; | |
1139 | if (len < 0 || len > __NEW_UTS_LEN) | |
1140 | return -EINVAL; | |
1141 | down_write(&uts_sem); | |
1142 | errno = -EFAULT; | |
1143 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1144 | struct new_utsname *u = utsname(); |
1145 | ||
1146 | memcpy(u->nodename, tmp, len); | |
1147 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1148 | errno = 0; |
1149 | } | |
1150 | up_write(&uts_sem); | |
1151 | return errno; | |
1152 | } | |
1153 | ||
1154 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1155 | ||
5a8a82b1 | 1156 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1157 | { |
1158 | int i, errno; | |
9679e4dd | 1159 | struct new_utsname *u; |
1da177e4 LT |
1160 | |
1161 | if (len < 0) | |
1162 | return -EINVAL; | |
1163 | down_read(&uts_sem); | |
9679e4dd AM |
1164 | u = utsname(); |
1165 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1166 | if (i > len) |
1167 | i = len; | |
1168 | errno = 0; | |
9679e4dd | 1169 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1170 | errno = -EFAULT; |
1171 | up_read(&uts_sem); | |
1172 | return errno; | |
1173 | } | |
1174 | ||
1175 | #endif | |
1176 | ||
1177 | /* | |
1178 | * Only setdomainname; getdomainname can be implemented by calling | |
1179 | * uname() | |
1180 | */ | |
5a8a82b1 | 1181 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1182 | { |
1183 | int errno; | |
1184 | char tmp[__NEW_UTS_LEN]; | |
1185 | ||
1186 | if (!capable(CAP_SYS_ADMIN)) | |
1187 | return -EPERM; | |
1188 | if (len < 0 || len > __NEW_UTS_LEN) | |
1189 | return -EINVAL; | |
1190 | ||
1191 | down_write(&uts_sem); | |
1192 | errno = -EFAULT; | |
1193 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1194 | struct new_utsname *u = utsname(); |
1195 | ||
1196 | memcpy(u->domainname, tmp, len); | |
1197 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1198 | errno = 0; |
1199 | } | |
1200 | up_write(&uts_sem); | |
1201 | return errno; | |
1202 | } | |
1203 | ||
e48fbb69 | 1204 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1205 | { |
1206 | if (resource >= RLIM_NLIMITS) | |
1207 | return -EINVAL; | |
1208 | else { | |
1209 | struct rlimit value; | |
1210 | task_lock(current->group_leader); | |
1211 | value = current->signal->rlim[resource]; | |
1212 | task_unlock(current->group_leader); | |
1213 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1218 | ||
1219 | /* | |
1220 | * Back compatibility for getrlimit. Needed for some apps. | |
1221 | */ | |
1222 | ||
e48fbb69 HC |
1223 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1224 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1225 | { |
1226 | struct rlimit x; | |
1227 | if (resource >= RLIM_NLIMITS) | |
1228 | return -EINVAL; | |
1229 | ||
1230 | task_lock(current->group_leader); | |
1231 | x = current->signal->rlim[resource]; | |
1232 | task_unlock(current->group_leader); | |
756184b7 | 1233 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1234 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1235 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1236 | x.rlim_max = 0x7FFFFFFF; |
1237 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1238 | } | |
1239 | ||
1240 | #endif | |
1241 | ||
e48fbb69 | 1242 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1243 | { |
1244 | struct rlimit new_rlim, *old_rlim; | |
1245 | int retval; | |
1246 | ||
1247 | if (resource >= RLIM_NLIMITS) | |
1248 | return -EINVAL; | |
ec9e16ba | 1249 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1250 | return -EFAULT; |
60fd760f AM |
1251 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
1252 | return -EINVAL; | |
1da177e4 LT |
1253 | old_rlim = current->signal->rlim + resource; |
1254 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1255 | !capable(CAP_SYS_RESOURCE)) | |
1256 | return -EPERM; | |
60fd760f AM |
1257 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
1258 | return -EPERM; | |
1da177e4 LT |
1259 | |
1260 | retval = security_task_setrlimit(resource, &new_rlim); | |
1261 | if (retval) | |
1262 | return retval; | |
1263 | ||
9926e4c7 TA |
1264 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1265 | /* | |
1266 | * The caller is asking for an immediate RLIMIT_CPU | |
1267 | * expiry. But we use the zero value to mean "it was | |
1268 | * never set". So let's cheat and make it one second | |
1269 | * instead | |
1270 | */ | |
1271 | new_rlim.rlim_cur = 1; | |
1272 | } | |
1273 | ||
1da177e4 LT |
1274 | task_lock(current->group_leader); |
1275 | *old_rlim = new_rlim; | |
1276 | task_unlock(current->group_leader); | |
1277 | ||
ec9e16ba AM |
1278 | if (resource != RLIMIT_CPU) |
1279 | goto out; | |
d3561f78 AM |
1280 | |
1281 | /* | |
1282 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1283 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1284 | * very long-standing error, and fixing it now risks breakage of | |
1285 | * applications, so we live with it | |
1286 | */ | |
ec9e16ba AM |
1287 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1288 | goto out; | |
1289 | ||
f06febc9 | 1290 | update_rlimit_cpu(new_rlim.rlim_cur); |
ec9e16ba | 1291 | out: |
1da177e4 LT |
1292 | return 0; |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * It would make sense to put struct rusage in the task_struct, | |
1297 | * except that would make the task_struct be *really big*. After | |
1298 | * task_struct gets moved into malloc'ed memory, it would | |
1299 | * make sense to do this. It will make moving the rest of the information | |
1300 | * a lot simpler! (Which we're not doing right now because we're not | |
1301 | * measuring them yet). | |
1302 | * | |
1da177e4 LT |
1303 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1304 | * races with threads incrementing their own counters. But since word | |
1305 | * reads are atomic, we either get new values or old values and we don't | |
1306 | * care which for the sums. We always take the siglock to protect reading | |
1307 | * the c* fields from p->signal from races with exit.c updating those | |
1308 | * fields when reaping, so a sample either gets all the additions of a | |
1309 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1310 | * |
de047c1b RT |
1311 | * Locking: |
1312 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1313 | * for the cases current multithreaded, non-current single threaded | |
1314 | * non-current multithreaded. Thread traversal is now safe with | |
1315 | * the siglock held. | |
1316 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1317 | * single threaded, as no one else can take our signal_struct away, no one | |
1318 | * else can reap the children to update signal->c* counters, and no one else | |
1319 | * can race with the signal-> fields. If we do not take any lock, the | |
1320 | * signal-> fields could be read out of order while another thread was just | |
1321 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1322 | * On the writer side, write memory barrier is implied in __exit_signal | |
1323 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1324 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1325 | * |
1da177e4 LT |
1326 | */ |
1327 | ||
f06febc9 | 1328 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1329 | { |
679c9cd4 SK |
1330 | r->ru_nvcsw += t->nvcsw; |
1331 | r->ru_nivcsw += t->nivcsw; | |
1332 | r->ru_minflt += t->min_flt; | |
1333 | r->ru_majflt += t->maj_flt; | |
1334 | r->ru_inblock += task_io_get_inblock(t); | |
1335 | r->ru_oublock += task_io_get_oublock(t); | |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1339 | { | |
1340 | struct task_struct *t; | |
1341 | unsigned long flags; | |
0cf55e1e | 1342 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1343 | unsigned long maxrss = 0; |
1da177e4 LT |
1344 | |
1345 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1346 | utime = stime = cputime_zero; |
1da177e4 | 1347 | |
679c9cd4 | 1348 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1349 | task_times(current, &utime, &stime); |
f06febc9 | 1350 | accumulate_thread_rusage(p, r); |
1f10206c | 1351 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1352 | goto out; |
1353 | } | |
1354 | ||
d6cf723a | 1355 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1356 | return; |
0f59cc4a | 1357 | |
1da177e4 | 1358 | switch (who) { |
0f59cc4a | 1359 | case RUSAGE_BOTH: |
1da177e4 | 1360 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1361 | utime = p->signal->cutime; |
1362 | stime = p->signal->cstime; | |
1363 | r->ru_nvcsw = p->signal->cnvcsw; | |
1364 | r->ru_nivcsw = p->signal->cnivcsw; | |
1365 | r->ru_minflt = p->signal->cmin_flt; | |
1366 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1367 | r->ru_inblock = p->signal->cinblock; |
1368 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1369 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1370 | |
1371 | if (who == RUSAGE_CHILDREN) | |
1372 | break; | |
1373 | ||
1da177e4 | 1374 | case RUSAGE_SELF: |
0cf55e1e HS |
1375 | thread_group_times(p, &tgutime, &tgstime); |
1376 | utime = cputime_add(utime, tgutime); | |
1377 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1378 | r->ru_nvcsw += p->signal->nvcsw; |
1379 | r->ru_nivcsw += p->signal->nivcsw; | |
1380 | r->ru_minflt += p->signal->min_flt; | |
1381 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1382 | r->ru_inblock += p->signal->inblock; |
1383 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1384 | if (maxrss < p->signal->maxrss) |
1385 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1386 | t = p; |
1387 | do { | |
f06febc9 | 1388 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1389 | t = next_thread(t); |
1390 | } while (t != p); | |
1da177e4 | 1391 | break; |
0f59cc4a | 1392 | |
1da177e4 LT |
1393 | default: |
1394 | BUG(); | |
1395 | } | |
de047c1b | 1396 | unlock_task_sighand(p, &flags); |
de047c1b | 1397 | |
679c9cd4 | 1398 | out: |
0f59cc4a ON |
1399 | cputime_to_timeval(utime, &r->ru_utime); |
1400 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1401 | |
1402 | if (who != RUSAGE_CHILDREN) { | |
1403 | struct mm_struct *mm = get_task_mm(p); | |
1404 | if (mm) { | |
1405 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1406 | mmput(mm); | |
1407 | } | |
1408 | } | |
1409 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1410 | } |
1411 | ||
1412 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1413 | { | |
1414 | struct rusage r; | |
1da177e4 | 1415 | k_getrusage(p, who, &r); |
1da177e4 LT |
1416 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1417 | } | |
1418 | ||
e48fbb69 | 1419 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1420 | { |
679c9cd4 SK |
1421 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1422 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1423 | return -EINVAL; |
1424 | return getrusage(current, who, ru); | |
1425 | } | |
1426 | ||
e48fbb69 | 1427 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1428 | { |
1429 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1430 | return mask; | |
1431 | } | |
3b7391de | 1432 | |
c4ea37c2 HC |
1433 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1434 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1435 | { |
b6dff3ec DH |
1436 | struct task_struct *me = current; |
1437 | unsigned char comm[sizeof(me->comm)]; | |
1438 | long error; | |
1da177e4 | 1439 | |
d84f4f99 DH |
1440 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1441 | if (error != -ENOSYS) | |
1da177e4 LT |
1442 | return error; |
1443 | ||
d84f4f99 | 1444 | error = 0; |
1da177e4 LT |
1445 | switch (option) { |
1446 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1447 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1448 | error = -EINVAL; |
1449 | break; | |
1450 | } | |
b6dff3ec DH |
1451 | me->pdeath_signal = arg2; |
1452 | error = 0; | |
1da177e4 LT |
1453 | break; |
1454 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1455 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1456 | break; |
1457 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1458 | error = get_dumpable(me->mm); |
1da177e4 LT |
1459 | break; |
1460 | case PR_SET_DUMPABLE: | |
abf75a50 | 1461 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1462 | error = -EINVAL; |
1463 | break; | |
1464 | } | |
b6dff3ec DH |
1465 | set_dumpable(me->mm, arg2); |
1466 | error = 0; | |
1da177e4 LT |
1467 | break; |
1468 | ||
1469 | case PR_SET_UNALIGN: | |
b6dff3ec | 1470 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1471 | break; |
1472 | case PR_GET_UNALIGN: | |
b6dff3ec | 1473 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1474 | break; |
1475 | case PR_SET_FPEMU: | |
b6dff3ec | 1476 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1477 | break; |
1478 | case PR_GET_FPEMU: | |
b6dff3ec | 1479 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1480 | break; |
1481 | case PR_SET_FPEXC: | |
b6dff3ec | 1482 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1483 | break; |
1484 | case PR_GET_FPEXC: | |
b6dff3ec | 1485 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1486 | break; |
1487 | case PR_GET_TIMING: | |
1488 | error = PR_TIMING_STATISTICAL; | |
1489 | break; | |
1490 | case PR_SET_TIMING: | |
7b26655f | 1491 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1492 | error = -EINVAL; |
b6dff3ec DH |
1493 | else |
1494 | error = 0; | |
1da177e4 LT |
1495 | break; |
1496 | ||
b6dff3ec DH |
1497 | case PR_SET_NAME: |
1498 | comm[sizeof(me->comm)-1] = 0; | |
1499 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1500 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1501 | return -EFAULT; |
b6dff3ec | 1502 | set_task_comm(me, comm); |
1da177e4 | 1503 | return 0; |
b6dff3ec DH |
1504 | case PR_GET_NAME: |
1505 | get_task_comm(comm, me); | |
1506 | if (copy_to_user((char __user *)arg2, comm, | |
1507 | sizeof(comm))) | |
1da177e4 LT |
1508 | return -EFAULT; |
1509 | return 0; | |
651d765d | 1510 | case PR_GET_ENDIAN: |
b6dff3ec | 1511 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1512 | break; |
1513 | case PR_SET_ENDIAN: | |
b6dff3ec | 1514 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1515 | break; |
1516 | ||
1d9d02fe AA |
1517 | case PR_GET_SECCOMP: |
1518 | error = prctl_get_seccomp(); | |
1519 | break; | |
1520 | case PR_SET_SECCOMP: | |
1521 | error = prctl_set_seccomp(arg2); | |
1522 | break; | |
8fb402bc EB |
1523 | case PR_GET_TSC: |
1524 | error = GET_TSC_CTL(arg2); | |
1525 | break; | |
1526 | case PR_SET_TSC: | |
1527 | error = SET_TSC_CTL(arg2); | |
1528 | break; | |
cdd6c482 IM |
1529 | case PR_TASK_PERF_EVENTS_DISABLE: |
1530 | error = perf_event_task_disable(); | |
1d1c7ddb | 1531 | break; |
cdd6c482 IM |
1532 | case PR_TASK_PERF_EVENTS_ENABLE: |
1533 | error = perf_event_task_enable(); | |
1d1c7ddb | 1534 | break; |
6976675d AV |
1535 | case PR_GET_TIMERSLACK: |
1536 | error = current->timer_slack_ns; | |
1537 | break; | |
1538 | case PR_SET_TIMERSLACK: | |
1539 | if (arg2 <= 0) | |
1540 | current->timer_slack_ns = | |
1541 | current->default_timer_slack_ns; | |
1542 | else | |
1543 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1544 | error = 0; |
6976675d | 1545 | break; |
4db96cf0 AK |
1546 | case PR_MCE_KILL: |
1547 | if (arg4 | arg5) | |
1548 | return -EINVAL; | |
1549 | switch (arg2) { | |
1087e9b4 | 1550 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1551 | if (arg3 != 0) |
1552 | return -EINVAL; | |
1553 | current->flags &= ~PF_MCE_PROCESS; | |
1554 | break; | |
1087e9b4 | 1555 | case PR_MCE_KILL_SET: |
4db96cf0 | 1556 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1557 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1558 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1559 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1560 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1561 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1562 | current->flags &= | |
1563 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1564 | else | |
1565 | return -EINVAL; | |
4db96cf0 AK |
1566 | break; |
1567 | default: | |
1568 | return -EINVAL; | |
1569 | } | |
1570 | error = 0; | |
1571 | break; | |
1087e9b4 AK |
1572 | case PR_MCE_KILL_GET: |
1573 | if (arg2 | arg3 | arg4 | arg5) | |
1574 | return -EINVAL; | |
1575 | if (current->flags & PF_MCE_PROCESS) | |
1576 | error = (current->flags & PF_MCE_EARLY) ? | |
1577 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1578 | else | |
1579 | error = PR_MCE_KILL_DEFAULT; | |
1580 | break; | |
1da177e4 LT |
1581 | default: |
1582 | error = -EINVAL; | |
1583 | break; | |
1584 | } | |
1585 | return error; | |
1586 | } | |
3cfc348b | 1587 | |
836f92ad HC |
1588 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1589 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1590 | { |
1591 | int err = 0; | |
1592 | int cpu = raw_smp_processor_id(); | |
1593 | if (cpup) | |
1594 | err |= put_user(cpu, cpup); | |
1595 | if (nodep) | |
1596 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1597 | return err ? -EFAULT : 0; |
1598 | } | |
10a0a8d4 JF |
1599 | |
1600 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1601 | ||
1602 | static void argv_cleanup(char **argv, char **envp) | |
1603 | { | |
1604 | argv_free(argv); | |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * orderly_poweroff - Trigger an orderly system poweroff | |
1609 | * @force: force poweroff if command execution fails | |
1610 | * | |
1611 | * This may be called from any context to trigger a system shutdown. | |
1612 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1613 | */ | |
1614 | int orderly_poweroff(bool force) | |
1615 | { | |
1616 | int argc; | |
1617 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1618 | static char *envp[] = { | |
1619 | "HOME=/", | |
1620 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1621 | NULL | |
1622 | }; | |
1623 | int ret = -ENOMEM; | |
1624 | struct subprocess_info *info; | |
1625 | ||
1626 | if (argv == NULL) { | |
1627 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1628 | __func__, poweroff_cmd); | |
1629 | goto out; | |
1630 | } | |
1631 | ||
ac331d15 | 1632 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1633 | if (info == NULL) { |
1634 | argv_free(argv); | |
1635 | goto out; | |
1636 | } | |
1637 | ||
1638 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1639 | ||
86313c48 | 1640 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1641 | |
1642 | out: | |
1643 | if (ret && force) { | |
1644 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1645 | "forcing the issue\n"); | |
1646 | ||
1647 | /* I guess this should try to kick off some daemon to | |
1648 | sync and poweroff asap. Or not even bother syncing | |
1649 | if we're doing an emergency shutdown? */ | |
1650 | emergency_sync(); | |
1651 | kernel_power_off(); | |
1652 | } | |
1653 | ||
1654 | return ret; | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(orderly_poweroff); |