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> |
5a0e3ad6 | 39 | #include <linux/gfp.h> |
1da177e4 LT |
40 | |
41 | #include <linux/compat.h> | |
42 | #include <linux/syscalls.h> | |
00d7c05a | 43 | #include <linux/kprobes.h> |
acce292c | 44 | #include <linux/user_namespace.h> |
1da177e4 LT |
45 | |
46 | #include <asm/uaccess.h> | |
47 | #include <asm/io.h> | |
48 | #include <asm/unistd.h> | |
49 | ||
50 | #ifndef SET_UNALIGN_CTL | |
51 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
52 | #endif | |
53 | #ifndef GET_UNALIGN_CTL | |
54 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
55 | #endif | |
56 | #ifndef SET_FPEMU_CTL | |
57 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
58 | #endif | |
59 | #ifndef GET_FPEMU_CTL | |
60 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
61 | #endif | |
62 | #ifndef SET_FPEXC_CTL | |
63 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
64 | #endif | |
65 | #ifndef GET_FPEXC_CTL | |
66 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
67 | #endif | |
651d765d AB |
68 | #ifndef GET_ENDIAN |
69 | # define GET_ENDIAN(a,b) (-EINVAL) | |
70 | #endif | |
71 | #ifndef SET_ENDIAN | |
72 | # define SET_ENDIAN(a,b) (-EINVAL) | |
73 | #endif | |
8fb402bc EB |
74 | #ifndef GET_TSC_CTL |
75 | # define GET_TSC_CTL(a) (-EINVAL) | |
76 | #endif | |
77 | #ifndef SET_TSC_CTL | |
78 | # define SET_TSC_CTL(a) (-EINVAL) | |
79 | #endif | |
1da177e4 LT |
80 | |
81 | /* | |
82 | * this is where the system-wide overflow UID and GID are defined, for | |
83 | * architectures that now have 32-bit UID/GID but didn't in the past | |
84 | */ | |
85 | ||
86 | int overflowuid = DEFAULT_OVERFLOWUID; | |
87 | int overflowgid = DEFAULT_OVERFLOWGID; | |
88 | ||
89 | #ifdef CONFIG_UID16 | |
90 | EXPORT_SYMBOL(overflowuid); | |
91 | EXPORT_SYMBOL(overflowgid); | |
92 | #endif | |
93 | ||
94 | /* | |
95 | * the same as above, but for filesystems which can only store a 16-bit | |
96 | * UID and GID. as such, this is needed on all architectures | |
97 | */ | |
98 | ||
99 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
100 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
101 | ||
102 | EXPORT_SYMBOL(fs_overflowuid); | |
103 | EXPORT_SYMBOL(fs_overflowgid); | |
104 | ||
105 | /* | |
106 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
107 | */ | |
108 | ||
109 | int C_A_D = 1; | |
9ec52099 CLG |
110 | struct pid *cad_pid; |
111 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 112 | |
bd804eba RW |
113 | /* |
114 | * If set, this is used for preparing the system to power off. | |
115 | */ | |
116 | ||
117 | void (*pm_power_off_prepare)(void); | |
bd804eba | 118 | |
c69e8d9c DH |
119 | /* |
120 | * set the priority of a task | |
121 | * - the caller must hold the RCU read lock | |
122 | */ | |
1da177e4 LT |
123 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
124 | { | |
c69e8d9c | 125 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
1da177e4 LT |
126 | int no_nice; |
127 | ||
c69e8d9c DH |
128 | if (pcred->uid != cred->euid && |
129 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
130 | error = -EPERM; |
131 | goto out; | |
132 | } | |
e43379f1 | 133 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
134 | error = -EACCES; |
135 | goto out; | |
136 | } | |
137 | no_nice = security_task_setnice(p, niceval); | |
138 | if (no_nice) { | |
139 | error = no_nice; | |
140 | goto out; | |
141 | } | |
142 | if (error == -ESRCH) | |
143 | error = 0; | |
144 | set_user_nice(p, niceval); | |
145 | out: | |
146 | return error; | |
147 | } | |
148 | ||
754fe8d2 | 149 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
150 | { |
151 | struct task_struct *g, *p; | |
152 | struct user_struct *user; | |
86a264ab | 153 | const struct cred *cred = current_cred(); |
1da177e4 | 154 | int error = -EINVAL; |
41487c65 | 155 | struct pid *pgrp; |
1da177e4 | 156 | |
3e88c553 | 157 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
158 | goto out; |
159 | ||
160 | /* normalize: avoid signed division (rounding problems) */ | |
161 | error = -ESRCH; | |
162 | if (niceval < -20) | |
163 | niceval = -20; | |
164 | if (niceval > 19) | |
165 | niceval = 19; | |
166 | ||
d4581a23 | 167 | rcu_read_lock(); |
1da177e4 LT |
168 | read_lock(&tasklist_lock); |
169 | switch (which) { | |
170 | case PRIO_PROCESS: | |
41487c65 | 171 | if (who) |
228ebcbe | 172 | p = find_task_by_vpid(who); |
41487c65 EB |
173 | else |
174 | p = current; | |
1da177e4 LT |
175 | if (p) |
176 | error = set_one_prio(p, niceval, error); | |
177 | break; | |
178 | case PRIO_PGRP: | |
41487c65 | 179 | if (who) |
b488893a | 180 | pgrp = find_vpid(who); |
41487c65 EB |
181 | else |
182 | pgrp = task_pgrp(current); | |
2d70b68d | 183 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 184 | error = set_one_prio(p, niceval, error); |
2d70b68d | 185 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
186 | break; |
187 | case PRIO_USER: | |
d84f4f99 | 188 | user = (struct user_struct *) cred->user; |
1da177e4 | 189 | if (!who) |
86a264ab DH |
190 | who = cred->uid; |
191 | else if ((who != cred->uid) && | |
192 | !(user = find_user(who))) | |
193 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 194 | |
dfc6a736 | 195 | do_each_thread(g, p) { |
86a264ab | 196 | if (__task_cred(p)->uid == who) |
1da177e4 | 197 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 198 | } while_each_thread(g, p); |
86a264ab | 199 | if (who != cred->uid) |
1da177e4 LT |
200 | free_uid(user); /* For find_user() */ |
201 | break; | |
202 | } | |
203 | out_unlock: | |
204 | read_unlock(&tasklist_lock); | |
d4581a23 | 205 | rcu_read_unlock(); |
1da177e4 LT |
206 | out: |
207 | return error; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Ugh. To avoid negative return values, "getpriority()" will | |
212 | * not return the normal nice-value, but a negated value that | |
213 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
214 | * to stay compatible. | |
215 | */ | |
754fe8d2 | 216 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
217 | { |
218 | struct task_struct *g, *p; | |
219 | struct user_struct *user; | |
86a264ab | 220 | const struct cred *cred = current_cred(); |
1da177e4 | 221 | long niceval, retval = -ESRCH; |
41487c65 | 222 | struct pid *pgrp; |
1da177e4 | 223 | |
3e88c553 | 224 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
225 | return -EINVAL; |
226 | ||
70118837 | 227 | rcu_read_lock(); |
1da177e4 LT |
228 | read_lock(&tasklist_lock); |
229 | switch (which) { | |
230 | case PRIO_PROCESS: | |
41487c65 | 231 | if (who) |
228ebcbe | 232 | p = find_task_by_vpid(who); |
41487c65 EB |
233 | else |
234 | p = current; | |
1da177e4 LT |
235 | if (p) { |
236 | niceval = 20 - task_nice(p); | |
237 | if (niceval > retval) | |
238 | retval = niceval; | |
239 | } | |
240 | break; | |
241 | case PRIO_PGRP: | |
41487c65 | 242 | if (who) |
b488893a | 243 | pgrp = find_vpid(who); |
41487c65 EB |
244 | else |
245 | pgrp = task_pgrp(current); | |
2d70b68d | 246 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
247 | niceval = 20 - task_nice(p); |
248 | if (niceval > retval) | |
249 | retval = niceval; | |
2d70b68d | 250 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
251 | break; |
252 | case PRIO_USER: | |
86a264ab | 253 | user = (struct user_struct *) cred->user; |
1da177e4 | 254 | if (!who) |
86a264ab DH |
255 | who = cred->uid; |
256 | else if ((who != cred->uid) && | |
257 | !(user = find_user(who))) | |
258 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 259 | |
dfc6a736 | 260 | do_each_thread(g, p) { |
86a264ab | 261 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
262 | niceval = 20 - task_nice(p); |
263 | if (niceval > retval) | |
264 | retval = niceval; | |
265 | } | |
dfc6a736 | 266 | } while_each_thread(g, p); |
86a264ab | 267 | if (who != cred->uid) |
1da177e4 LT |
268 | free_uid(user); /* for find_user() */ |
269 | break; | |
270 | } | |
271 | out_unlock: | |
272 | read_unlock(&tasklist_lock); | |
70118837 | 273 | rcu_read_unlock(); |
1da177e4 LT |
274 | |
275 | return retval; | |
276 | } | |
277 | ||
e4c94330 EB |
278 | /** |
279 | * emergency_restart - reboot the system | |
280 | * | |
281 | * Without shutting down any hardware or taking any locks | |
282 | * reboot the system. This is called when we know we are in | |
283 | * trouble so this is our best effort to reboot. This is | |
284 | * safe to call in interrupt context. | |
285 | */ | |
7c903473 EB |
286 | void emergency_restart(void) |
287 | { | |
288 | machine_emergency_restart(); | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(emergency_restart); | |
291 | ||
ca195b7f | 292 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 293 | { |
e041c683 | 294 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 295 | system_state = SYSTEM_RESTART; |
4a00ea1e | 296 | device_shutdown(); |
58b3b71d | 297 | sysdev_shutdown(); |
e4c94330 | 298 | } |
1e5d5331 RD |
299 | |
300 | /** | |
301 | * kernel_restart - reboot the system | |
302 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 303 | * or %NULL |
1e5d5331 RD |
304 | * |
305 | * Shutdown everything and perform a clean reboot. | |
306 | * This is not safe to call in interrupt context. | |
307 | */ | |
e4c94330 EB |
308 | void kernel_restart(char *cmd) |
309 | { | |
310 | kernel_restart_prepare(cmd); | |
756184b7 | 311 | if (!cmd) |
4a00ea1e | 312 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 313 | else |
4a00ea1e | 314 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
315 | machine_restart(cmd); |
316 | } | |
317 | EXPORT_SYMBOL_GPL(kernel_restart); | |
318 | ||
4ef7229f | 319 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 320 | { |
e041c683 | 321 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
322 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
323 | system_state = state; | |
324 | device_shutdown(); | |
325 | } | |
e4c94330 EB |
326 | /** |
327 | * kernel_halt - halt the system | |
328 | * | |
329 | * Shutdown everything and perform a clean system halt. | |
330 | */ | |
e4c94330 EB |
331 | void kernel_halt(void) |
332 | { | |
729b4d4c | 333 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 334 | sysdev_shutdown(); |
4a00ea1e EB |
335 | printk(KERN_EMERG "System halted.\n"); |
336 | machine_halt(); | |
337 | } | |
729b4d4c | 338 | |
4a00ea1e EB |
339 | EXPORT_SYMBOL_GPL(kernel_halt); |
340 | ||
e4c94330 EB |
341 | /** |
342 | * kernel_power_off - power_off the system | |
343 | * | |
344 | * Shutdown everything and perform a clean system power_off. | |
345 | */ | |
e4c94330 EB |
346 | void kernel_power_off(void) |
347 | { | |
729b4d4c | 348 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
349 | if (pm_power_off_prepare) |
350 | pm_power_off_prepare(); | |
4047727e | 351 | disable_nonboot_cpus(); |
58b3b71d | 352 | sysdev_shutdown(); |
4a00ea1e EB |
353 | printk(KERN_EMERG "Power down.\n"); |
354 | machine_power_off(); | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
357 | |
358 | static DEFINE_MUTEX(reboot_mutex); | |
359 | ||
1da177e4 LT |
360 | /* |
361 | * Reboot system call: for obvious reasons only root may call it, | |
362 | * and even root needs to set up some magic numbers in the registers | |
363 | * so that some mistake won't make this reboot the whole machine. | |
364 | * You can also set the meaning of the ctrl-alt-del-key here. | |
365 | * | |
366 | * reboot doesn't sync: do that yourself before calling this. | |
367 | */ | |
754fe8d2 HC |
368 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
369 | void __user *, arg) | |
1da177e4 LT |
370 | { |
371 | char buffer[256]; | |
3d26dcf7 | 372 | int ret = 0; |
1da177e4 LT |
373 | |
374 | /* We only trust the superuser with rebooting the system. */ | |
375 | if (!capable(CAP_SYS_BOOT)) | |
376 | return -EPERM; | |
377 | ||
378 | /* For safety, we require "magic" arguments. */ | |
379 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
380 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
381 | magic2 != LINUX_REBOOT_MAGIC2A && | |
382 | magic2 != LINUX_REBOOT_MAGIC2B && | |
383 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
384 | return -EINVAL; | |
385 | ||
5e38291d EB |
386 | /* Instead of trying to make the power_off code look like |
387 | * halt when pm_power_off is not set do it the easy way. | |
388 | */ | |
389 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
390 | cmd = LINUX_REBOOT_CMD_HALT; | |
391 | ||
6f15fa50 | 392 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
393 | switch (cmd) { |
394 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 395 | kernel_restart(NULL); |
1da177e4 LT |
396 | break; |
397 | ||
398 | case LINUX_REBOOT_CMD_CAD_ON: | |
399 | C_A_D = 1; | |
400 | break; | |
401 | ||
402 | case LINUX_REBOOT_CMD_CAD_OFF: | |
403 | C_A_D = 0; | |
404 | break; | |
405 | ||
406 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 407 | kernel_halt(); |
1da177e4 | 408 | do_exit(0); |
3d26dcf7 | 409 | panic("cannot halt"); |
1da177e4 LT |
410 | |
411 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 412 | kernel_power_off(); |
1da177e4 LT |
413 | do_exit(0); |
414 | break; | |
415 | ||
416 | case LINUX_REBOOT_CMD_RESTART2: | |
417 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
418 | ret = -EFAULT; |
419 | break; | |
1da177e4 LT |
420 | } |
421 | buffer[sizeof(buffer) - 1] = '\0'; | |
422 | ||
4a00ea1e | 423 | kernel_restart(buffer); |
1da177e4 LT |
424 | break; |
425 | ||
3ab83521 | 426 | #ifdef CONFIG_KEXEC |
dc009d92 | 427 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
428 | ret = kernel_kexec(); |
429 | break; | |
3ab83521 | 430 | #endif |
4a00ea1e | 431 | |
b0cb1a19 | 432 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 433 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
434 | ret = hibernate(); |
435 | break; | |
1da177e4 LT |
436 | #endif |
437 | ||
438 | default: | |
3d26dcf7 AK |
439 | ret = -EINVAL; |
440 | break; | |
1da177e4 | 441 | } |
6f15fa50 | 442 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 443 | return ret; |
1da177e4 LT |
444 | } |
445 | ||
65f27f38 | 446 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 447 | { |
abcd9e51 | 448 | kernel_restart(NULL); |
1da177e4 LT |
449 | } |
450 | ||
451 | /* | |
452 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
453 | * As it's called within an interrupt, it may NOT sync: the only choice | |
454 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
455 | */ | |
456 | void ctrl_alt_del(void) | |
457 | { | |
65f27f38 | 458 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
459 | |
460 | if (C_A_D) | |
461 | schedule_work(&cad_work); | |
462 | else | |
9ec52099 | 463 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
464 | } |
465 | ||
1da177e4 LT |
466 | /* |
467 | * Unprivileged users may change the real gid to the effective gid | |
468 | * or vice versa. (BSD-style) | |
469 | * | |
470 | * If you set the real gid at all, or set the effective gid to a value not | |
471 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
472 | * | |
473 | * This makes it possible for a setgid program to completely drop its | |
474 | * privileges, which is often a useful assertion to make when you are doing | |
475 | * a security audit over a program. | |
476 | * | |
477 | * The general idea is that a program which uses just setregid() will be | |
478 | * 100% compatible with BSD. A program which uses just setgid() will be | |
479 | * 100% compatible with POSIX with saved IDs. | |
480 | * | |
481 | * SMP: There are not races, the GIDs are checked only by filesystem | |
482 | * operations (as far as semantic preservation is concerned). | |
483 | */ | |
ae1251ab | 484 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 485 | { |
d84f4f99 DH |
486 | const struct cred *old; |
487 | struct cred *new; | |
1da177e4 LT |
488 | int retval; |
489 | ||
d84f4f99 DH |
490 | new = prepare_creds(); |
491 | if (!new) | |
492 | return -ENOMEM; | |
493 | old = current_cred(); | |
494 | ||
1da177e4 LT |
495 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); |
496 | if (retval) | |
d84f4f99 | 497 | goto error; |
1da177e4 | 498 | |
d84f4f99 | 499 | retval = -EPERM; |
1da177e4 | 500 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
501 | if (old->gid == rgid || |
502 | old->egid == rgid || | |
1da177e4 | 503 | capable(CAP_SETGID)) |
d84f4f99 | 504 | new->gid = rgid; |
1da177e4 | 505 | else |
d84f4f99 | 506 | goto error; |
1da177e4 LT |
507 | } |
508 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
509 | if (old->gid == egid || |
510 | old->egid == egid || | |
511 | old->sgid == egid || | |
1da177e4 | 512 | capable(CAP_SETGID)) |
d84f4f99 | 513 | new->egid = egid; |
756184b7 | 514 | else |
d84f4f99 | 515 | goto error; |
1da177e4 | 516 | } |
d84f4f99 | 517 | |
1da177e4 | 518 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
519 | (egid != (gid_t) -1 && egid != old->gid)) |
520 | new->sgid = new->egid; | |
521 | new->fsgid = new->egid; | |
522 | ||
523 | return commit_creds(new); | |
524 | ||
525 | error: | |
526 | abort_creds(new); | |
527 | return retval; | |
1da177e4 LT |
528 | } |
529 | ||
530 | /* | |
531 | * setgid() is implemented like SysV w/ SAVED_IDS | |
532 | * | |
533 | * SMP: Same implicit races as above. | |
534 | */ | |
ae1251ab | 535 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 536 | { |
d84f4f99 DH |
537 | const struct cred *old; |
538 | struct cred *new; | |
1da177e4 LT |
539 | int retval; |
540 | ||
d84f4f99 DH |
541 | new = prepare_creds(); |
542 | if (!new) | |
543 | return -ENOMEM; | |
544 | old = current_cred(); | |
545 | ||
1da177e4 LT |
546 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); |
547 | if (retval) | |
d84f4f99 | 548 | goto error; |
1da177e4 | 549 | |
d84f4f99 DH |
550 | retval = -EPERM; |
551 | if (capable(CAP_SETGID)) | |
552 | new->gid = new->egid = new->sgid = new->fsgid = gid; | |
553 | else if (gid == old->gid || gid == old->sgid) | |
554 | new->egid = new->fsgid = gid; | |
1da177e4 | 555 | else |
d84f4f99 | 556 | goto error; |
1da177e4 | 557 | |
d84f4f99 DH |
558 | return commit_creds(new); |
559 | ||
560 | error: | |
561 | abort_creds(new); | |
562 | return retval; | |
1da177e4 | 563 | } |
54e99124 | 564 | |
d84f4f99 DH |
565 | /* |
566 | * change the user struct in a credentials set to match the new UID | |
567 | */ | |
568 | static int set_user(struct cred *new) | |
1da177e4 LT |
569 | { |
570 | struct user_struct *new_user; | |
571 | ||
18b6e041 | 572 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
573 | if (!new_user) |
574 | return -EAGAIN; | |
575 | ||
78d7d407 | 576 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
18b6e041 | 577 | new_user != INIT_USER) { |
1da177e4 LT |
578 | free_uid(new_user); |
579 | return -EAGAIN; | |
580 | } | |
581 | ||
d84f4f99 DH |
582 | free_uid(new->user); |
583 | new->user = new_user; | |
1da177e4 LT |
584 | return 0; |
585 | } | |
586 | ||
587 | /* | |
588 | * Unprivileged users may change the real uid to the effective uid | |
589 | * or vice versa. (BSD-style) | |
590 | * | |
591 | * If you set the real uid at all, or set the effective uid to a value not | |
592 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
593 | * | |
594 | * This makes it possible for a setuid program to completely drop its | |
595 | * privileges, which is often a useful assertion to make when you are doing | |
596 | * a security audit over a program. | |
597 | * | |
598 | * The general idea is that a program which uses just setreuid() will be | |
599 | * 100% compatible with BSD. A program which uses just setuid() will be | |
600 | * 100% compatible with POSIX with saved IDs. | |
601 | */ | |
ae1251ab | 602 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 603 | { |
d84f4f99 DH |
604 | const struct cred *old; |
605 | struct cred *new; | |
1da177e4 LT |
606 | int retval; |
607 | ||
d84f4f99 DH |
608 | new = prepare_creds(); |
609 | if (!new) | |
610 | return -ENOMEM; | |
611 | old = current_cred(); | |
612 | ||
1da177e4 LT |
613 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); |
614 | if (retval) | |
d84f4f99 | 615 | goto error; |
1da177e4 | 616 | |
d84f4f99 | 617 | retval = -EPERM; |
1da177e4 | 618 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
619 | new->uid = ruid; |
620 | if (old->uid != ruid && | |
621 | old->euid != ruid && | |
1da177e4 | 622 | !capable(CAP_SETUID)) |
d84f4f99 | 623 | goto error; |
1da177e4 LT |
624 | } |
625 | ||
626 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
627 | new->euid = euid; |
628 | if (old->uid != euid && | |
629 | old->euid != euid && | |
630 | old->suid != euid && | |
1da177e4 | 631 | !capable(CAP_SETUID)) |
d84f4f99 | 632 | goto error; |
1da177e4 LT |
633 | } |
634 | ||
54e99124 DG |
635 | if (new->uid != old->uid) { |
636 | retval = set_user(new); | |
637 | if (retval < 0) | |
638 | goto error; | |
639 | } | |
1da177e4 | 640 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
641 | (euid != (uid_t) -1 && euid != old->uid)) |
642 | new->suid = new->euid; | |
643 | new->fsuid = new->euid; | |
1da177e4 | 644 | |
d84f4f99 DH |
645 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
646 | if (retval < 0) | |
647 | goto error; | |
1da177e4 | 648 | |
d84f4f99 | 649 | return commit_creds(new); |
1da177e4 | 650 | |
d84f4f99 DH |
651 | error: |
652 | abort_creds(new); | |
653 | return retval; | |
654 | } | |
1da177e4 LT |
655 | |
656 | /* | |
657 | * setuid() is implemented like SysV with SAVED_IDS | |
658 | * | |
659 | * Note that SAVED_ID's is deficient in that a setuid root program | |
660 | * like sendmail, for example, cannot set its uid to be a normal | |
661 | * user and then switch back, because if you're root, setuid() sets | |
662 | * the saved uid too. If you don't like this, blame the bright people | |
663 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
664 | * will allow a root program to temporarily drop privileges and be able to | |
665 | * regain them by swapping the real and effective uid. | |
666 | */ | |
ae1251ab | 667 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 668 | { |
d84f4f99 DH |
669 | const struct cred *old; |
670 | struct cred *new; | |
1da177e4 LT |
671 | int retval; |
672 | ||
d84f4f99 DH |
673 | new = prepare_creds(); |
674 | if (!new) | |
675 | return -ENOMEM; | |
676 | old = current_cred(); | |
677 | ||
1da177e4 LT |
678 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); |
679 | if (retval) | |
d84f4f99 | 680 | goto error; |
1da177e4 | 681 | |
d84f4f99 | 682 | retval = -EPERM; |
1da177e4 | 683 | if (capable(CAP_SETUID)) { |
d84f4f99 | 684 | new->suid = new->uid = uid; |
54e99124 DG |
685 | if (uid != old->uid) { |
686 | retval = set_user(new); | |
687 | if (retval < 0) | |
688 | goto error; | |
d84f4f99 DH |
689 | } |
690 | } else if (uid != old->uid && uid != new->suid) { | |
691 | goto error; | |
1da177e4 | 692 | } |
1da177e4 | 693 | |
d84f4f99 DH |
694 | new->fsuid = new->euid = uid; |
695 | ||
696 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
697 | if (retval < 0) | |
698 | goto error; | |
1da177e4 | 699 | |
d84f4f99 | 700 | return commit_creds(new); |
1da177e4 | 701 | |
d84f4f99 DH |
702 | error: |
703 | abort_creds(new); | |
704 | return retval; | |
1da177e4 LT |
705 | } |
706 | ||
707 | ||
708 | /* | |
709 | * This function implements a generic ability to update ruid, euid, | |
710 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
711 | */ | |
ae1251ab | 712 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 713 | { |
d84f4f99 DH |
714 | const struct cred *old; |
715 | struct cred *new; | |
1da177e4 LT |
716 | int retval; |
717 | ||
d84f4f99 DH |
718 | new = prepare_creds(); |
719 | if (!new) | |
720 | return -ENOMEM; | |
721 | ||
1da177e4 LT |
722 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); |
723 | if (retval) | |
d84f4f99 DH |
724 | goto error; |
725 | old = current_cred(); | |
1da177e4 | 726 | |
d84f4f99 | 727 | retval = -EPERM; |
1da177e4 | 728 | if (!capable(CAP_SETUID)) { |
d84f4f99 DH |
729 | if (ruid != (uid_t) -1 && ruid != old->uid && |
730 | ruid != old->euid && ruid != old->suid) | |
731 | goto error; | |
732 | if (euid != (uid_t) -1 && euid != old->uid && | |
733 | euid != old->euid && euid != old->suid) | |
734 | goto error; | |
735 | if (suid != (uid_t) -1 && suid != old->uid && | |
736 | suid != old->euid && suid != old->suid) | |
737 | goto error; | |
1da177e4 | 738 | } |
d84f4f99 | 739 | |
1da177e4 | 740 | if (ruid != (uid_t) -1) { |
d84f4f99 | 741 | new->uid = ruid; |
54e99124 DG |
742 | if (ruid != old->uid) { |
743 | retval = set_user(new); | |
744 | if (retval < 0) | |
745 | goto error; | |
746 | } | |
1da177e4 | 747 | } |
d84f4f99 DH |
748 | if (euid != (uid_t) -1) |
749 | new->euid = euid; | |
1da177e4 | 750 | if (suid != (uid_t) -1) |
d84f4f99 DH |
751 | new->suid = suid; |
752 | new->fsuid = new->euid; | |
1da177e4 | 753 | |
d84f4f99 DH |
754 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
755 | if (retval < 0) | |
756 | goto error; | |
1da177e4 | 757 | |
d84f4f99 | 758 | return commit_creds(new); |
1da177e4 | 759 | |
d84f4f99 DH |
760 | error: |
761 | abort_creds(new); | |
762 | return retval; | |
1da177e4 LT |
763 | } |
764 | ||
dbf040d9 | 765 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 766 | { |
86a264ab | 767 | const struct cred *cred = current_cred(); |
1da177e4 LT |
768 | int retval; |
769 | ||
86a264ab DH |
770 | if (!(retval = put_user(cred->uid, ruid)) && |
771 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 772 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
773 | |
774 | return retval; | |
775 | } | |
776 | ||
777 | /* | |
778 | * Same as above, but for rgid, egid, sgid. | |
779 | */ | |
ae1251ab | 780 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 781 | { |
d84f4f99 DH |
782 | const struct cred *old; |
783 | struct cred *new; | |
1da177e4 LT |
784 | int retval; |
785 | ||
d84f4f99 DH |
786 | new = prepare_creds(); |
787 | if (!new) | |
788 | return -ENOMEM; | |
789 | old = current_cred(); | |
790 | ||
1da177e4 LT |
791 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); |
792 | if (retval) | |
d84f4f99 | 793 | goto error; |
1da177e4 | 794 | |
d84f4f99 | 795 | retval = -EPERM; |
1da177e4 | 796 | if (!capable(CAP_SETGID)) { |
d84f4f99 DH |
797 | if (rgid != (gid_t) -1 && rgid != old->gid && |
798 | rgid != old->egid && rgid != old->sgid) | |
799 | goto error; | |
800 | if (egid != (gid_t) -1 && egid != old->gid && | |
801 | egid != old->egid && egid != old->sgid) | |
802 | goto error; | |
803 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
804 | sgid != old->egid && sgid != old->sgid) | |
805 | goto error; | |
1da177e4 | 806 | } |
d84f4f99 | 807 | |
1da177e4 | 808 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
809 | new->gid = rgid; |
810 | if (egid != (gid_t) -1) | |
811 | new->egid = egid; | |
1da177e4 | 812 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
813 | new->sgid = sgid; |
814 | new->fsgid = new->egid; | |
1da177e4 | 815 | |
d84f4f99 DH |
816 | return commit_creds(new); |
817 | ||
818 | error: | |
819 | abort_creds(new); | |
820 | return retval; | |
1da177e4 LT |
821 | } |
822 | ||
dbf040d9 | 823 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 824 | { |
86a264ab | 825 | const struct cred *cred = current_cred(); |
1da177e4 LT |
826 | int retval; |
827 | ||
86a264ab DH |
828 | if (!(retval = put_user(cred->gid, rgid)) && |
829 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 830 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
831 | |
832 | return retval; | |
833 | } | |
834 | ||
835 | ||
836 | /* | |
837 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
838 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
839 | * whatever uid it wants to). It normally shadows "euid", except when | |
840 | * explicitly set by setfsuid() or for access.. | |
841 | */ | |
ae1251ab | 842 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 843 | { |
d84f4f99 DH |
844 | const struct cred *old; |
845 | struct cred *new; | |
846 | uid_t old_fsuid; | |
1da177e4 | 847 | |
d84f4f99 DH |
848 | new = prepare_creds(); |
849 | if (!new) | |
850 | return current_fsuid(); | |
851 | old = current_cred(); | |
852 | old_fsuid = old->fsuid; | |
1da177e4 | 853 | |
d84f4f99 DH |
854 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0) |
855 | goto error; | |
1da177e4 | 856 | |
d84f4f99 DH |
857 | if (uid == old->uid || uid == old->euid || |
858 | uid == old->suid || uid == old->fsuid || | |
756184b7 CP |
859 | capable(CAP_SETUID)) { |
860 | if (uid != old_fsuid) { | |
d84f4f99 DH |
861 | new->fsuid = uid; |
862 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
863 | goto change_okay; | |
1da177e4 | 864 | } |
1da177e4 LT |
865 | } |
866 | ||
d84f4f99 DH |
867 | error: |
868 | abort_creds(new); | |
869 | return old_fsuid; | |
1da177e4 | 870 | |
d84f4f99 DH |
871 | change_okay: |
872 | commit_creds(new); | |
1da177e4 LT |
873 | return old_fsuid; |
874 | } | |
875 | ||
876 | /* | |
f42df9e6 | 877 | * Samma på svenska.. |
1da177e4 | 878 | */ |
ae1251ab | 879 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 880 | { |
d84f4f99 DH |
881 | const struct cred *old; |
882 | struct cred *new; | |
883 | gid_t old_fsgid; | |
884 | ||
885 | new = prepare_creds(); | |
886 | if (!new) | |
887 | return current_fsgid(); | |
888 | old = current_cred(); | |
889 | old_fsgid = old->fsgid; | |
1da177e4 | 890 | |
1da177e4 | 891 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
d84f4f99 | 892 | goto error; |
1da177e4 | 893 | |
d84f4f99 DH |
894 | if (gid == old->gid || gid == old->egid || |
895 | gid == old->sgid || gid == old->fsgid || | |
756184b7 CP |
896 | capable(CAP_SETGID)) { |
897 | if (gid != old_fsgid) { | |
d84f4f99 DH |
898 | new->fsgid = gid; |
899 | goto change_okay; | |
1da177e4 | 900 | } |
1da177e4 | 901 | } |
d84f4f99 DH |
902 | |
903 | error: | |
904 | abort_creds(new); | |
905 | return old_fsgid; | |
906 | ||
907 | change_okay: | |
908 | commit_creds(new); | |
1da177e4 LT |
909 | return old_fsgid; |
910 | } | |
911 | ||
f06febc9 FM |
912 | void do_sys_times(struct tms *tms) |
913 | { | |
0cf55e1e | 914 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 915 | |
2b5fe6de | 916 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 917 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
918 | cutime = current->signal->cutime; |
919 | cstime = current->signal->cstime; | |
920 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
921 | tms->tms_utime = cputime_to_clock_t(tgutime); |
922 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
923 | tms->tms_cutime = cputime_to_clock_t(cutime); |
924 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
925 | } | |
926 | ||
58fd3aa2 | 927 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 928 | { |
1da177e4 LT |
929 | if (tbuf) { |
930 | struct tms tmp; | |
f06febc9 FM |
931 | |
932 | do_sys_times(&tmp); | |
1da177e4 LT |
933 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
934 | return -EFAULT; | |
935 | } | |
e3d5a27d | 936 | force_successful_syscall_return(); |
1da177e4 LT |
937 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
938 | } | |
939 | ||
940 | /* | |
941 | * This needs some heavy checking ... | |
942 | * I just haven't the stomach for it. I also don't fully | |
943 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
944 | * | |
945 | * OK, I think I have the protection semantics right.... this is really | |
946 | * only important on a multi-user system anyway, to make sure one user | |
947 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
948 | * | |
949 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
950 | * LBT 04.03.94 | |
951 | */ | |
b290ebe2 | 952 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
953 | { |
954 | struct task_struct *p; | |
ee0acf90 | 955 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
956 | struct pid *pgrp; |
957 | int err; | |
1da177e4 LT |
958 | |
959 | if (!pid) | |
b488893a | 960 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
961 | if (!pgid) |
962 | pgid = pid; | |
963 | if (pgid < 0) | |
964 | return -EINVAL; | |
965 | ||
966 | /* From this point forward we keep holding onto the tasklist lock | |
967 | * so that our parent does not change from under us. -DaveM | |
968 | */ | |
969 | write_lock_irq(&tasklist_lock); | |
970 | ||
971 | err = -ESRCH; | |
4e021306 | 972 | p = find_task_by_vpid(pid); |
1da177e4 LT |
973 | if (!p) |
974 | goto out; | |
975 | ||
976 | err = -EINVAL; | |
977 | if (!thread_group_leader(p)) | |
978 | goto out; | |
979 | ||
4e021306 | 980 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 981 | err = -EPERM; |
41487c65 | 982 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
983 | goto out; |
984 | err = -EACCES; | |
985 | if (p->did_exec) | |
986 | goto out; | |
987 | } else { | |
988 | err = -ESRCH; | |
ee0acf90 | 989 | if (p != group_leader) |
1da177e4 LT |
990 | goto out; |
991 | } | |
992 | ||
993 | err = -EPERM; | |
994 | if (p->signal->leader) | |
995 | goto out; | |
996 | ||
4e021306 | 997 | pgrp = task_pid(p); |
1da177e4 | 998 | if (pgid != pid) { |
b488893a | 999 | struct task_struct *g; |
1da177e4 | 1000 | |
4e021306 ON |
1001 | pgrp = find_vpid(pgid); |
1002 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1003 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1004 | goto out; |
1da177e4 LT |
1005 | } |
1006 | ||
1da177e4 LT |
1007 | err = security_task_setpgid(p, pgid); |
1008 | if (err) | |
1009 | goto out; | |
1010 | ||
1b0f7ffd | 1011 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1012 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1013 | |
1014 | err = 0; | |
1015 | out: | |
1016 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1017 | write_unlock_irq(&tasklist_lock); | |
1018 | return err; | |
1019 | } | |
1020 | ||
dbf040d9 | 1021 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1022 | { |
12a3de0a ON |
1023 | struct task_struct *p; |
1024 | struct pid *grp; | |
1025 | int retval; | |
1026 | ||
1027 | rcu_read_lock(); | |
756184b7 | 1028 | if (!pid) |
12a3de0a | 1029 | grp = task_pgrp(current); |
756184b7 | 1030 | else { |
1da177e4 | 1031 | retval = -ESRCH; |
12a3de0a ON |
1032 | p = find_task_by_vpid(pid); |
1033 | if (!p) | |
1034 | goto out; | |
1035 | grp = task_pgrp(p); | |
1036 | if (!grp) | |
1037 | goto out; | |
1038 | ||
1039 | retval = security_task_getpgid(p); | |
1040 | if (retval) | |
1041 | goto out; | |
1da177e4 | 1042 | } |
12a3de0a ON |
1043 | retval = pid_vnr(grp); |
1044 | out: | |
1045 | rcu_read_unlock(); | |
1046 | return retval; | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1050 | ||
dbf040d9 | 1051 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1052 | { |
12a3de0a | 1053 | return sys_getpgid(0); |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | #endif | |
1057 | ||
dbf040d9 | 1058 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1059 | { |
1dd768c0 ON |
1060 | struct task_struct *p; |
1061 | struct pid *sid; | |
1062 | int retval; | |
1063 | ||
1064 | rcu_read_lock(); | |
756184b7 | 1065 | if (!pid) |
1dd768c0 | 1066 | sid = task_session(current); |
756184b7 | 1067 | else { |
1da177e4 | 1068 | retval = -ESRCH; |
1dd768c0 ON |
1069 | p = find_task_by_vpid(pid); |
1070 | if (!p) | |
1071 | goto out; | |
1072 | sid = task_session(p); | |
1073 | if (!sid) | |
1074 | goto out; | |
1075 | ||
1076 | retval = security_task_getsid(p); | |
1077 | if (retval) | |
1078 | goto out; | |
1da177e4 | 1079 | } |
1dd768c0 ON |
1080 | retval = pid_vnr(sid); |
1081 | out: | |
1082 | rcu_read_unlock(); | |
1083 | return retval; | |
1da177e4 LT |
1084 | } |
1085 | ||
b290ebe2 | 1086 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1087 | { |
e19f247a | 1088 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1089 | struct pid *sid = task_pid(group_leader); |
1090 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1091 | int err = -EPERM; |
1092 | ||
1da177e4 | 1093 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1094 | /* Fail if I am already a session leader */ |
1095 | if (group_leader->signal->leader) | |
1096 | goto out; | |
1097 | ||
430c6231 ON |
1098 | /* Fail if a process group id already exists that equals the |
1099 | * proposed session id. | |
390e2ff0 | 1100 | */ |
6806aac6 | 1101 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1102 | goto out; |
1103 | ||
e19f247a | 1104 | group_leader->signal->leader = 1; |
8520d7c7 | 1105 | __set_special_pids(sid); |
24ec839c | 1106 | |
9c9f4ded | 1107 | proc_clear_tty(group_leader); |
24ec839c | 1108 | |
e4cc0a9c | 1109 | err = session; |
1da177e4 LT |
1110 | out: |
1111 | write_unlock_irq(&tasklist_lock); | |
0d0df599 CB |
1112 | if (err > 0) |
1113 | proc_sid_connector(group_leader); | |
1da177e4 LT |
1114 | return err; |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | DECLARE_RWSEM(uts_sem); |
1118 | ||
e28cbf22 CH |
1119 | #ifdef COMPAT_UTS_MACHINE |
1120 | #define override_architecture(name) \ | |
46da2766 | 1121 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1122 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1123 | sizeof(COMPAT_UTS_MACHINE))) | |
1124 | #else | |
1125 | #define override_architecture(name) 0 | |
1126 | #endif | |
1127 | ||
e48fbb69 | 1128 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1129 | { |
1130 | int errno = 0; | |
1131 | ||
1132 | down_read(&uts_sem); | |
e9ff3990 | 1133 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1134 | errno = -EFAULT; |
1135 | up_read(&uts_sem); | |
e28cbf22 CH |
1136 | |
1137 | if (!errno && override_architecture(name)) | |
1138 | errno = -EFAULT; | |
1da177e4 LT |
1139 | return errno; |
1140 | } | |
1141 | ||
5cacdb4a CH |
1142 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1143 | /* | |
1144 | * Old cruft | |
1145 | */ | |
1146 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1147 | { | |
1148 | int error = 0; | |
1149 | ||
1150 | if (!name) | |
1151 | return -EFAULT; | |
1152 | ||
1153 | down_read(&uts_sem); | |
1154 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1155 | error = -EFAULT; | |
1156 | up_read(&uts_sem); | |
1157 | ||
1158 | if (!error && override_architecture(name)) | |
1159 | error = -EFAULT; | |
1160 | return error; | |
1161 | } | |
1162 | ||
1163 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1164 | { | |
1165 | int error; | |
1166 | ||
1167 | if (!name) | |
1168 | return -EFAULT; | |
1169 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1170 | return -EFAULT; | |
1171 | ||
1172 | down_read(&uts_sem); | |
1173 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1174 | __OLD_UTS_LEN); | |
1175 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1176 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1177 | __OLD_UTS_LEN); | |
1178 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1179 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1180 | __OLD_UTS_LEN); | |
1181 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1182 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1183 | __OLD_UTS_LEN); | |
1184 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1185 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1186 | __OLD_UTS_LEN); | |
1187 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1188 | up_read(&uts_sem); | |
1189 | ||
1190 | if (!error && override_architecture(name)) | |
1191 | error = -EFAULT; | |
1192 | return error ? -EFAULT : 0; | |
1193 | } | |
1194 | #endif | |
1195 | ||
5a8a82b1 | 1196 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1197 | { |
1198 | int errno; | |
1199 | char tmp[__NEW_UTS_LEN]; | |
1200 | ||
1201 | if (!capable(CAP_SYS_ADMIN)) | |
1202 | return -EPERM; | |
1203 | if (len < 0 || len > __NEW_UTS_LEN) | |
1204 | return -EINVAL; | |
1205 | down_write(&uts_sem); | |
1206 | errno = -EFAULT; | |
1207 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1208 | struct new_utsname *u = utsname(); |
1209 | ||
1210 | memcpy(u->nodename, tmp, len); | |
1211 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1212 | errno = 0; |
1213 | } | |
1214 | up_write(&uts_sem); | |
1215 | return errno; | |
1216 | } | |
1217 | ||
1218 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1219 | ||
5a8a82b1 | 1220 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1221 | { |
1222 | int i, errno; | |
9679e4dd | 1223 | struct new_utsname *u; |
1da177e4 LT |
1224 | |
1225 | if (len < 0) | |
1226 | return -EINVAL; | |
1227 | down_read(&uts_sem); | |
9679e4dd AM |
1228 | u = utsname(); |
1229 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1230 | if (i > len) |
1231 | i = len; | |
1232 | errno = 0; | |
9679e4dd | 1233 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1234 | errno = -EFAULT; |
1235 | up_read(&uts_sem); | |
1236 | return errno; | |
1237 | } | |
1238 | ||
1239 | #endif | |
1240 | ||
1241 | /* | |
1242 | * Only setdomainname; getdomainname can be implemented by calling | |
1243 | * uname() | |
1244 | */ | |
5a8a82b1 | 1245 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1246 | { |
1247 | int errno; | |
1248 | char tmp[__NEW_UTS_LEN]; | |
1249 | ||
1250 | if (!capable(CAP_SYS_ADMIN)) | |
1251 | return -EPERM; | |
1252 | if (len < 0 || len > __NEW_UTS_LEN) | |
1253 | return -EINVAL; | |
1254 | ||
1255 | down_write(&uts_sem); | |
1256 | errno = -EFAULT; | |
1257 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1258 | struct new_utsname *u = utsname(); |
1259 | ||
1260 | memcpy(u->domainname, tmp, len); | |
1261 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1262 | errno = 0; |
1263 | } | |
1264 | up_write(&uts_sem); | |
1265 | return errno; | |
1266 | } | |
1267 | ||
e48fbb69 | 1268 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1269 | { |
1270 | if (resource >= RLIM_NLIMITS) | |
1271 | return -EINVAL; | |
1272 | else { | |
1273 | struct rlimit value; | |
1274 | task_lock(current->group_leader); | |
1275 | value = current->signal->rlim[resource]; | |
1276 | task_unlock(current->group_leader); | |
1277 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1282 | ||
1283 | /* | |
1284 | * Back compatibility for getrlimit. Needed for some apps. | |
1285 | */ | |
1286 | ||
e48fbb69 HC |
1287 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1288 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1289 | { |
1290 | struct rlimit x; | |
1291 | if (resource >= RLIM_NLIMITS) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | task_lock(current->group_leader); | |
1295 | x = current->signal->rlim[resource]; | |
1296 | task_unlock(current->group_leader); | |
756184b7 | 1297 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1298 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1299 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1300 | x.rlim_max = 0x7FFFFFFF; |
1301 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1302 | } | |
1303 | ||
1304 | #endif | |
1305 | ||
e48fbb69 | 1306 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 LT |
1307 | { |
1308 | struct rlimit new_rlim, *old_rlim; | |
1309 | int retval; | |
1310 | ||
1311 | if (resource >= RLIM_NLIMITS) | |
1312 | return -EINVAL; | |
ec9e16ba | 1313 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1314 | return -EFAULT; |
60fd760f AM |
1315 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
1316 | return -EINVAL; | |
1da177e4 LT |
1317 | old_rlim = current->signal->rlim + resource; |
1318 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1319 | !capable(CAP_SYS_RESOURCE)) | |
1320 | return -EPERM; | |
60fd760f AM |
1321 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
1322 | return -EPERM; | |
1da177e4 LT |
1323 | |
1324 | retval = security_task_setrlimit(resource, &new_rlim); | |
1325 | if (retval) | |
1326 | return retval; | |
1327 | ||
9926e4c7 TA |
1328 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1329 | /* | |
1330 | * The caller is asking for an immediate RLIMIT_CPU | |
1331 | * expiry. But we use the zero value to mean "it was | |
1332 | * never set". So let's cheat and make it one second | |
1333 | * instead | |
1334 | */ | |
1335 | new_rlim.rlim_cur = 1; | |
1336 | } | |
1337 | ||
1da177e4 LT |
1338 | task_lock(current->group_leader); |
1339 | *old_rlim = new_rlim; | |
1340 | task_unlock(current->group_leader); | |
1341 | ||
ec9e16ba AM |
1342 | if (resource != RLIMIT_CPU) |
1343 | goto out; | |
d3561f78 AM |
1344 | |
1345 | /* | |
1346 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1347 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1348 | * very long-standing error, and fixing it now risks breakage of | |
1349 | * applications, so we live with it | |
1350 | */ | |
ec9e16ba AM |
1351 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1352 | goto out; | |
1353 | ||
f06febc9 | 1354 | update_rlimit_cpu(new_rlim.rlim_cur); |
ec9e16ba | 1355 | out: |
1da177e4 LT |
1356 | return 0; |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * It would make sense to put struct rusage in the task_struct, | |
1361 | * except that would make the task_struct be *really big*. After | |
1362 | * task_struct gets moved into malloc'ed memory, it would | |
1363 | * make sense to do this. It will make moving the rest of the information | |
1364 | * a lot simpler! (Which we're not doing right now because we're not | |
1365 | * measuring them yet). | |
1366 | * | |
1da177e4 LT |
1367 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1368 | * races with threads incrementing their own counters. But since word | |
1369 | * reads are atomic, we either get new values or old values and we don't | |
1370 | * care which for the sums. We always take the siglock to protect reading | |
1371 | * the c* fields from p->signal from races with exit.c updating those | |
1372 | * fields when reaping, so a sample either gets all the additions of a | |
1373 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1374 | * |
de047c1b RT |
1375 | * Locking: |
1376 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1377 | * for the cases current multithreaded, non-current single threaded | |
1378 | * non-current multithreaded. Thread traversal is now safe with | |
1379 | * the siglock held. | |
1380 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1381 | * single threaded, as no one else can take our signal_struct away, no one | |
1382 | * else can reap the children to update signal->c* counters, and no one else | |
1383 | * can race with the signal-> fields. If we do not take any lock, the | |
1384 | * signal-> fields could be read out of order while another thread was just | |
1385 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1386 | * On the writer side, write memory barrier is implied in __exit_signal | |
1387 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1388 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1389 | * |
1da177e4 LT |
1390 | */ |
1391 | ||
f06febc9 | 1392 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1393 | { |
679c9cd4 SK |
1394 | r->ru_nvcsw += t->nvcsw; |
1395 | r->ru_nivcsw += t->nivcsw; | |
1396 | r->ru_minflt += t->min_flt; | |
1397 | r->ru_majflt += t->maj_flt; | |
1398 | r->ru_inblock += task_io_get_inblock(t); | |
1399 | r->ru_oublock += task_io_get_oublock(t); | |
1400 | } | |
1401 | ||
1da177e4 LT |
1402 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1403 | { | |
1404 | struct task_struct *t; | |
1405 | unsigned long flags; | |
0cf55e1e | 1406 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1407 | unsigned long maxrss = 0; |
1da177e4 LT |
1408 | |
1409 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1410 | utime = stime = cputime_zero; |
1da177e4 | 1411 | |
679c9cd4 | 1412 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1413 | task_times(current, &utime, &stime); |
f06febc9 | 1414 | accumulate_thread_rusage(p, r); |
1f10206c | 1415 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1416 | goto out; |
1417 | } | |
1418 | ||
d6cf723a | 1419 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1420 | return; |
0f59cc4a | 1421 | |
1da177e4 | 1422 | switch (who) { |
0f59cc4a | 1423 | case RUSAGE_BOTH: |
1da177e4 | 1424 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1425 | utime = p->signal->cutime; |
1426 | stime = p->signal->cstime; | |
1427 | r->ru_nvcsw = p->signal->cnvcsw; | |
1428 | r->ru_nivcsw = p->signal->cnivcsw; | |
1429 | r->ru_minflt = p->signal->cmin_flt; | |
1430 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1431 | r->ru_inblock = p->signal->cinblock; |
1432 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1433 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1434 | |
1435 | if (who == RUSAGE_CHILDREN) | |
1436 | break; | |
1437 | ||
1da177e4 | 1438 | case RUSAGE_SELF: |
0cf55e1e HS |
1439 | thread_group_times(p, &tgutime, &tgstime); |
1440 | utime = cputime_add(utime, tgutime); | |
1441 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1442 | r->ru_nvcsw += p->signal->nvcsw; |
1443 | r->ru_nivcsw += p->signal->nivcsw; | |
1444 | r->ru_minflt += p->signal->min_flt; | |
1445 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1446 | r->ru_inblock += p->signal->inblock; |
1447 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1448 | if (maxrss < p->signal->maxrss) |
1449 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1450 | t = p; |
1451 | do { | |
f06febc9 | 1452 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1453 | t = next_thread(t); |
1454 | } while (t != p); | |
1da177e4 | 1455 | break; |
0f59cc4a | 1456 | |
1da177e4 LT |
1457 | default: |
1458 | BUG(); | |
1459 | } | |
de047c1b | 1460 | unlock_task_sighand(p, &flags); |
de047c1b | 1461 | |
679c9cd4 | 1462 | out: |
0f59cc4a ON |
1463 | cputime_to_timeval(utime, &r->ru_utime); |
1464 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1465 | |
1466 | if (who != RUSAGE_CHILDREN) { | |
1467 | struct mm_struct *mm = get_task_mm(p); | |
1468 | if (mm) { | |
1469 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1470 | mmput(mm); | |
1471 | } | |
1472 | } | |
1473 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1477 | { | |
1478 | struct rusage r; | |
1da177e4 | 1479 | k_getrusage(p, who, &r); |
1da177e4 LT |
1480 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1481 | } | |
1482 | ||
e48fbb69 | 1483 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1484 | { |
679c9cd4 SK |
1485 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1486 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1487 | return -EINVAL; |
1488 | return getrusage(current, who, ru); | |
1489 | } | |
1490 | ||
e48fbb69 | 1491 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1492 | { |
1493 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1494 | return mask; | |
1495 | } | |
3b7391de | 1496 | |
c4ea37c2 HC |
1497 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1498 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1499 | { |
b6dff3ec DH |
1500 | struct task_struct *me = current; |
1501 | unsigned char comm[sizeof(me->comm)]; | |
1502 | long error; | |
1da177e4 | 1503 | |
d84f4f99 DH |
1504 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1505 | if (error != -ENOSYS) | |
1da177e4 LT |
1506 | return error; |
1507 | ||
d84f4f99 | 1508 | error = 0; |
1da177e4 LT |
1509 | switch (option) { |
1510 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1511 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1512 | error = -EINVAL; |
1513 | break; | |
1514 | } | |
b6dff3ec DH |
1515 | me->pdeath_signal = arg2; |
1516 | error = 0; | |
1da177e4 LT |
1517 | break; |
1518 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1519 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1520 | break; |
1521 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1522 | error = get_dumpable(me->mm); |
1da177e4 LT |
1523 | break; |
1524 | case PR_SET_DUMPABLE: | |
abf75a50 | 1525 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1526 | error = -EINVAL; |
1527 | break; | |
1528 | } | |
b6dff3ec DH |
1529 | set_dumpable(me->mm, arg2); |
1530 | error = 0; | |
1da177e4 LT |
1531 | break; |
1532 | ||
1533 | case PR_SET_UNALIGN: | |
b6dff3ec | 1534 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1535 | break; |
1536 | case PR_GET_UNALIGN: | |
b6dff3ec | 1537 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1538 | break; |
1539 | case PR_SET_FPEMU: | |
b6dff3ec | 1540 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1541 | break; |
1542 | case PR_GET_FPEMU: | |
b6dff3ec | 1543 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1544 | break; |
1545 | case PR_SET_FPEXC: | |
b6dff3ec | 1546 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1547 | break; |
1548 | case PR_GET_FPEXC: | |
b6dff3ec | 1549 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1550 | break; |
1551 | case PR_GET_TIMING: | |
1552 | error = PR_TIMING_STATISTICAL; | |
1553 | break; | |
1554 | case PR_SET_TIMING: | |
7b26655f | 1555 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1556 | error = -EINVAL; |
b6dff3ec DH |
1557 | else |
1558 | error = 0; | |
1da177e4 LT |
1559 | break; |
1560 | ||
b6dff3ec DH |
1561 | case PR_SET_NAME: |
1562 | comm[sizeof(me->comm)-1] = 0; | |
1563 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1564 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1565 | return -EFAULT; |
b6dff3ec | 1566 | set_task_comm(me, comm); |
1da177e4 | 1567 | return 0; |
b6dff3ec DH |
1568 | case PR_GET_NAME: |
1569 | get_task_comm(comm, me); | |
1570 | if (copy_to_user((char __user *)arg2, comm, | |
1571 | sizeof(comm))) | |
1da177e4 LT |
1572 | return -EFAULT; |
1573 | return 0; | |
651d765d | 1574 | case PR_GET_ENDIAN: |
b6dff3ec | 1575 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1576 | break; |
1577 | case PR_SET_ENDIAN: | |
b6dff3ec | 1578 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1579 | break; |
1580 | ||
1d9d02fe AA |
1581 | case PR_GET_SECCOMP: |
1582 | error = prctl_get_seccomp(); | |
1583 | break; | |
1584 | case PR_SET_SECCOMP: | |
1585 | error = prctl_set_seccomp(arg2); | |
1586 | break; | |
8fb402bc EB |
1587 | case PR_GET_TSC: |
1588 | error = GET_TSC_CTL(arg2); | |
1589 | break; | |
1590 | case PR_SET_TSC: | |
1591 | error = SET_TSC_CTL(arg2); | |
1592 | break; | |
cdd6c482 IM |
1593 | case PR_TASK_PERF_EVENTS_DISABLE: |
1594 | error = perf_event_task_disable(); | |
1d1c7ddb | 1595 | break; |
cdd6c482 IM |
1596 | case PR_TASK_PERF_EVENTS_ENABLE: |
1597 | error = perf_event_task_enable(); | |
1d1c7ddb | 1598 | break; |
6976675d AV |
1599 | case PR_GET_TIMERSLACK: |
1600 | error = current->timer_slack_ns; | |
1601 | break; | |
1602 | case PR_SET_TIMERSLACK: | |
1603 | if (arg2 <= 0) | |
1604 | current->timer_slack_ns = | |
1605 | current->default_timer_slack_ns; | |
1606 | else | |
1607 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1608 | error = 0; |
6976675d | 1609 | break; |
4db96cf0 AK |
1610 | case PR_MCE_KILL: |
1611 | if (arg4 | arg5) | |
1612 | return -EINVAL; | |
1613 | switch (arg2) { | |
1087e9b4 | 1614 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1615 | if (arg3 != 0) |
1616 | return -EINVAL; | |
1617 | current->flags &= ~PF_MCE_PROCESS; | |
1618 | break; | |
1087e9b4 | 1619 | case PR_MCE_KILL_SET: |
4db96cf0 | 1620 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1621 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1622 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1623 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1624 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1625 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1626 | current->flags &= | |
1627 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1628 | else | |
1629 | return -EINVAL; | |
4db96cf0 AK |
1630 | break; |
1631 | default: | |
1632 | return -EINVAL; | |
1633 | } | |
1634 | error = 0; | |
1635 | break; | |
1087e9b4 AK |
1636 | case PR_MCE_KILL_GET: |
1637 | if (arg2 | arg3 | arg4 | arg5) | |
1638 | return -EINVAL; | |
1639 | if (current->flags & PF_MCE_PROCESS) | |
1640 | error = (current->flags & PF_MCE_EARLY) ? | |
1641 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1642 | else | |
1643 | error = PR_MCE_KILL_DEFAULT; | |
1644 | break; | |
1da177e4 LT |
1645 | default: |
1646 | error = -EINVAL; | |
1647 | break; | |
1648 | } | |
1649 | return error; | |
1650 | } | |
3cfc348b | 1651 | |
836f92ad HC |
1652 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1653 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1654 | { |
1655 | int err = 0; | |
1656 | int cpu = raw_smp_processor_id(); | |
1657 | if (cpup) | |
1658 | err |= put_user(cpu, cpup); | |
1659 | if (nodep) | |
1660 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1661 | return err ? -EFAULT : 0; |
1662 | } | |
10a0a8d4 JF |
1663 | |
1664 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1665 | ||
1666 | static void argv_cleanup(char **argv, char **envp) | |
1667 | { | |
1668 | argv_free(argv); | |
1669 | } | |
1670 | ||
1671 | /** | |
1672 | * orderly_poweroff - Trigger an orderly system poweroff | |
1673 | * @force: force poweroff if command execution fails | |
1674 | * | |
1675 | * This may be called from any context to trigger a system shutdown. | |
1676 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1677 | */ | |
1678 | int orderly_poweroff(bool force) | |
1679 | { | |
1680 | int argc; | |
1681 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1682 | static char *envp[] = { | |
1683 | "HOME=/", | |
1684 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1685 | NULL | |
1686 | }; | |
1687 | int ret = -ENOMEM; | |
1688 | struct subprocess_info *info; | |
1689 | ||
1690 | if (argv == NULL) { | |
1691 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1692 | __func__, poweroff_cmd); | |
1693 | goto out; | |
1694 | } | |
1695 | ||
ac331d15 | 1696 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1697 | if (info == NULL) { |
1698 | argv_free(argv); | |
1699 | goto out; | |
1700 | } | |
1701 | ||
1702 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1703 | ||
86313c48 | 1704 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1705 | |
1706 | out: | |
1707 | if (ret && force) { | |
1708 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1709 | "forcing the issue\n"); | |
1710 | ||
1711 | /* I guess this should try to kick off some daemon to | |
1712 | sync and poweroff asap. Or not even bother syncing | |
1713 | if we're doing an emergency shutdown? */ | |
1714 | emergency_sync(); | |
1715 | kernel_power_off(); | |
1716 | } | |
1717 | ||
1718 | return ret; | |
1719 | } | |
1720 | EXPORT_SYMBOL_GPL(orderly_poweroff); |