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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> |
e28cbf22 | 36 | #include <linux/personality.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
5ad4e53b | 38 | #include <linux/fs_struct.h> |
5a0e3ad6 | 39 | #include <linux/gfp.h> |
40dc166c | 40 | #include <linux/syscore_ops.h> |
1da177e4 LT |
41 | |
42 | #include <linux/compat.h> | |
43 | #include <linux/syscalls.h> | |
00d7c05a | 44 | #include <linux/kprobes.h> |
acce292c | 45 | #include <linux/user_namespace.h> |
1da177e4 | 46 | |
04c6862c SA |
47 | #include <linux/kmsg_dump.h> |
48 | ||
1da177e4 LT |
49 | #include <asm/uaccess.h> |
50 | #include <asm/io.h> | |
51 | #include <asm/unistd.h> | |
52 | ||
53 | #ifndef SET_UNALIGN_CTL | |
54 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
55 | #endif | |
56 | #ifndef GET_UNALIGN_CTL | |
57 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
58 | #endif | |
59 | #ifndef SET_FPEMU_CTL | |
60 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
61 | #endif | |
62 | #ifndef GET_FPEMU_CTL | |
63 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
64 | #endif | |
65 | #ifndef SET_FPEXC_CTL | |
66 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
67 | #endif | |
68 | #ifndef GET_FPEXC_CTL | |
69 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
70 | #endif | |
651d765d AB |
71 | #ifndef GET_ENDIAN |
72 | # define GET_ENDIAN(a,b) (-EINVAL) | |
73 | #endif | |
74 | #ifndef SET_ENDIAN | |
75 | # define SET_ENDIAN(a,b) (-EINVAL) | |
76 | #endif | |
8fb402bc EB |
77 | #ifndef GET_TSC_CTL |
78 | # define GET_TSC_CTL(a) (-EINVAL) | |
79 | #endif | |
80 | #ifndef SET_TSC_CTL | |
81 | # define SET_TSC_CTL(a) (-EINVAL) | |
82 | #endif | |
1da177e4 LT |
83 | |
84 | /* | |
85 | * this is where the system-wide overflow UID and GID are defined, for | |
86 | * architectures that now have 32-bit UID/GID but didn't in the past | |
87 | */ | |
88 | ||
89 | int overflowuid = DEFAULT_OVERFLOWUID; | |
90 | int overflowgid = DEFAULT_OVERFLOWGID; | |
91 | ||
92 | #ifdef CONFIG_UID16 | |
93 | EXPORT_SYMBOL(overflowuid); | |
94 | EXPORT_SYMBOL(overflowgid); | |
95 | #endif | |
96 | ||
97 | /* | |
98 | * the same as above, but for filesystems which can only store a 16-bit | |
99 | * UID and GID. as such, this is needed on all architectures | |
100 | */ | |
101 | ||
102 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
103 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
104 | ||
105 | EXPORT_SYMBOL(fs_overflowuid); | |
106 | EXPORT_SYMBOL(fs_overflowgid); | |
107 | ||
108 | /* | |
109 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
110 | */ | |
111 | ||
112 | int C_A_D = 1; | |
9ec52099 CLG |
113 | struct pid *cad_pid; |
114 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 115 | |
bd804eba RW |
116 | /* |
117 | * If set, this is used for preparing the system to power off. | |
118 | */ | |
119 | ||
120 | void (*pm_power_off_prepare)(void); | |
bd804eba | 121 | |
c69e8d9c DH |
122 | /* |
123 | * set the priority of a task | |
124 | * - the caller must hold the RCU read lock | |
125 | */ | |
1da177e4 LT |
126 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
127 | { | |
c69e8d9c | 128 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
1da177e4 LT |
129 | int no_nice; |
130 | ||
c69e8d9c DH |
131 | if (pcred->uid != cred->euid && |
132 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
133 | error = -EPERM; |
134 | goto out; | |
135 | } | |
e43379f1 | 136 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
137 | error = -EACCES; |
138 | goto out; | |
139 | } | |
140 | no_nice = security_task_setnice(p, niceval); | |
141 | if (no_nice) { | |
142 | error = no_nice; | |
143 | goto out; | |
144 | } | |
145 | if (error == -ESRCH) | |
146 | error = 0; | |
147 | set_user_nice(p, niceval); | |
148 | out: | |
149 | return error; | |
150 | } | |
151 | ||
754fe8d2 | 152 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
153 | { |
154 | struct task_struct *g, *p; | |
155 | struct user_struct *user; | |
86a264ab | 156 | const struct cred *cred = current_cred(); |
1da177e4 | 157 | int error = -EINVAL; |
41487c65 | 158 | struct pid *pgrp; |
1da177e4 | 159 | |
3e88c553 | 160 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
161 | goto out; |
162 | ||
163 | /* normalize: avoid signed division (rounding problems) */ | |
164 | error = -ESRCH; | |
165 | if (niceval < -20) | |
166 | niceval = -20; | |
167 | if (niceval > 19) | |
168 | niceval = 19; | |
169 | ||
d4581a23 | 170 | rcu_read_lock(); |
1da177e4 LT |
171 | read_lock(&tasklist_lock); |
172 | switch (which) { | |
173 | case PRIO_PROCESS: | |
41487c65 | 174 | if (who) |
228ebcbe | 175 | p = find_task_by_vpid(who); |
41487c65 EB |
176 | else |
177 | p = current; | |
1da177e4 LT |
178 | if (p) |
179 | error = set_one_prio(p, niceval, error); | |
180 | break; | |
181 | case PRIO_PGRP: | |
41487c65 | 182 | if (who) |
b488893a | 183 | pgrp = find_vpid(who); |
41487c65 EB |
184 | else |
185 | pgrp = task_pgrp(current); | |
2d70b68d | 186 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 187 | error = set_one_prio(p, niceval, error); |
2d70b68d | 188 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
189 | break; |
190 | case PRIO_USER: | |
d84f4f99 | 191 | user = (struct user_struct *) cred->user; |
1da177e4 | 192 | if (!who) |
86a264ab DH |
193 | who = cred->uid; |
194 | else if ((who != cred->uid) && | |
195 | !(user = find_user(who))) | |
196 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 197 | |
dfc6a736 | 198 | do_each_thread(g, p) { |
86a264ab | 199 | if (__task_cred(p)->uid == who) |
1da177e4 | 200 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 201 | } while_each_thread(g, p); |
86a264ab | 202 | if (who != cred->uid) |
1da177e4 LT |
203 | free_uid(user); /* For find_user() */ |
204 | break; | |
205 | } | |
206 | out_unlock: | |
207 | read_unlock(&tasklist_lock); | |
d4581a23 | 208 | rcu_read_unlock(); |
1da177e4 LT |
209 | out: |
210 | return error; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Ugh. To avoid negative return values, "getpriority()" will | |
215 | * not return the normal nice-value, but a negated value that | |
216 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
217 | * to stay compatible. | |
218 | */ | |
754fe8d2 | 219 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
220 | { |
221 | struct task_struct *g, *p; | |
222 | struct user_struct *user; | |
86a264ab | 223 | const struct cred *cred = current_cred(); |
1da177e4 | 224 | long niceval, retval = -ESRCH; |
41487c65 | 225 | struct pid *pgrp; |
1da177e4 | 226 | |
3e88c553 | 227 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
228 | return -EINVAL; |
229 | ||
70118837 | 230 | rcu_read_lock(); |
1da177e4 LT |
231 | read_lock(&tasklist_lock); |
232 | switch (which) { | |
233 | case PRIO_PROCESS: | |
41487c65 | 234 | if (who) |
228ebcbe | 235 | p = find_task_by_vpid(who); |
41487c65 EB |
236 | else |
237 | p = current; | |
1da177e4 LT |
238 | if (p) { |
239 | niceval = 20 - task_nice(p); | |
240 | if (niceval > retval) | |
241 | retval = niceval; | |
242 | } | |
243 | break; | |
244 | case PRIO_PGRP: | |
41487c65 | 245 | if (who) |
b488893a | 246 | pgrp = find_vpid(who); |
41487c65 EB |
247 | else |
248 | pgrp = task_pgrp(current); | |
2d70b68d | 249 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
250 | niceval = 20 - task_nice(p); |
251 | if (niceval > retval) | |
252 | retval = niceval; | |
2d70b68d | 253 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
254 | break; |
255 | case PRIO_USER: | |
86a264ab | 256 | user = (struct user_struct *) cred->user; |
1da177e4 | 257 | if (!who) |
86a264ab DH |
258 | who = cred->uid; |
259 | else if ((who != cred->uid) && | |
260 | !(user = find_user(who))) | |
261 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 262 | |
dfc6a736 | 263 | do_each_thread(g, p) { |
86a264ab | 264 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
265 | niceval = 20 - task_nice(p); |
266 | if (niceval > retval) | |
267 | retval = niceval; | |
268 | } | |
dfc6a736 | 269 | } while_each_thread(g, p); |
86a264ab | 270 | if (who != cred->uid) |
1da177e4 LT |
271 | free_uid(user); /* for find_user() */ |
272 | break; | |
273 | } | |
274 | out_unlock: | |
275 | read_unlock(&tasklist_lock); | |
70118837 | 276 | rcu_read_unlock(); |
1da177e4 LT |
277 | |
278 | return retval; | |
279 | } | |
280 | ||
e4c94330 EB |
281 | /** |
282 | * emergency_restart - reboot the system | |
283 | * | |
284 | * Without shutting down any hardware or taking any locks | |
285 | * reboot the system. This is called when we know we are in | |
286 | * trouble so this is our best effort to reboot. This is | |
287 | * safe to call in interrupt context. | |
288 | */ | |
7c903473 EB |
289 | void emergency_restart(void) |
290 | { | |
04c6862c | 291 | kmsg_dump(KMSG_DUMP_EMERG); |
7c903473 EB |
292 | machine_emergency_restart(); |
293 | } | |
294 | EXPORT_SYMBOL_GPL(emergency_restart); | |
295 | ||
ca195b7f | 296 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 297 | { |
e041c683 | 298 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 299 | system_state = SYSTEM_RESTART; |
4a00ea1e | 300 | device_shutdown(); |
58b3b71d | 301 | sysdev_shutdown(); |
40dc166c | 302 | syscore_shutdown(); |
e4c94330 | 303 | } |
1e5d5331 RD |
304 | |
305 | /** | |
306 | * kernel_restart - reboot the system | |
307 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 308 | * or %NULL |
1e5d5331 RD |
309 | * |
310 | * Shutdown everything and perform a clean reboot. | |
311 | * This is not safe to call in interrupt context. | |
312 | */ | |
e4c94330 EB |
313 | void kernel_restart(char *cmd) |
314 | { | |
315 | kernel_restart_prepare(cmd); | |
756184b7 | 316 | if (!cmd) |
4a00ea1e | 317 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 318 | else |
4a00ea1e | 319 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
04c6862c | 320 | kmsg_dump(KMSG_DUMP_RESTART); |
4a00ea1e EB |
321 | machine_restart(cmd); |
322 | } | |
323 | EXPORT_SYMBOL_GPL(kernel_restart); | |
324 | ||
4ef7229f | 325 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 326 | { |
e041c683 | 327 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
328 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
329 | system_state = state; | |
330 | device_shutdown(); | |
331 | } | |
e4c94330 EB |
332 | /** |
333 | * kernel_halt - halt the system | |
334 | * | |
335 | * Shutdown everything and perform a clean system halt. | |
336 | */ | |
e4c94330 EB |
337 | void kernel_halt(void) |
338 | { | |
729b4d4c | 339 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 340 | sysdev_shutdown(); |
40dc166c | 341 | syscore_shutdown(); |
4a00ea1e | 342 | printk(KERN_EMERG "System halted.\n"); |
04c6862c | 343 | kmsg_dump(KMSG_DUMP_HALT); |
4a00ea1e EB |
344 | machine_halt(); |
345 | } | |
729b4d4c | 346 | |
4a00ea1e EB |
347 | EXPORT_SYMBOL_GPL(kernel_halt); |
348 | ||
e4c94330 EB |
349 | /** |
350 | * kernel_power_off - power_off the system | |
351 | * | |
352 | * Shutdown everything and perform a clean system power_off. | |
353 | */ | |
e4c94330 EB |
354 | void kernel_power_off(void) |
355 | { | |
729b4d4c | 356 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
357 | if (pm_power_off_prepare) |
358 | pm_power_off_prepare(); | |
4047727e | 359 | disable_nonboot_cpus(); |
58b3b71d | 360 | sysdev_shutdown(); |
40dc166c | 361 | syscore_shutdown(); |
4a00ea1e | 362 | printk(KERN_EMERG "Power down.\n"); |
04c6862c | 363 | kmsg_dump(KMSG_DUMP_POWEROFF); |
4a00ea1e EB |
364 | machine_power_off(); |
365 | } | |
366 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
367 | |
368 | static DEFINE_MUTEX(reboot_mutex); | |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Reboot system call: for obvious reasons only root may call it, | |
372 | * and even root needs to set up some magic numbers in the registers | |
373 | * so that some mistake won't make this reboot the whole machine. | |
374 | * You can also set the meaning of the ctrl-alt-del-key here. | |
375 | * | |
376 | * reboot doesn't sync: do that yourself before calling this. | |
377 | */ | |
754fe8d2 HC |
378 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
379 | void __user *, arg) | |
1da177e4 LT |
380 | { |
381 | char buffer[256]; | |
3d26dcf7 | 382 | int ret = 0; |
1da177e4 LT |
383 | |
384 | /* We only trust the superuser with rebooting the system. */ | |
385 | if (!capable(CAP_SYS_BOOT)) | |
386 | return -EPERM; | |
387 | ||
388 | /* For safety, we require "magic" arguments. */ | |
389 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
390 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
391 | magic2 != LINUX_REBOOT_MAGIC2A && | |
392 | magic2 != LINUX_REBOOT_MAGIC2B && | |
393 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
394 | return -EINVAL; | |
395 | ||
5e38291d EB |
396 | /* Instead of trying to make the power_off code look like |
397 | * halt when pm_power_off is not set do it the easy way. | |
398 | */ | |
399 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
400 | cmd = LINUX_REBOOT_CMD_HALT; | |
401 | ||
6f15fa50 | 402 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
403 | switch (cmd) { |
404 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 405 | kernel_restart(NULL); |
1da177e4 LT |
406 | break; |
407 | ||
408 | case LINUX_REBOOT_CMD_CAD_ON: | |
409 | C_A_D = 1; | |
410 | break; | |
411 | ||
412 | case LINUX_REBOOT_CMD_CAD_OFF: | |
413 | C_A_D = 0; | |
414 | break; | |
415 | ||
416 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 417 | kernel_halt(); |
1da177e4 | 418 | do_exit(0); |
3d26dcf7 | 419 | panic("cannot halt"); |
1da177e4 LT |
420 | |
421 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 422 | kernel_power_off(); |
1da177e4 LT |
423 | do_exit(0); |
424 | break; | |
425 | ||
426 | case LINUX_REBOOT_CMD_RESTART2: | |
427 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
428 | ret = -EFAULT; |
429 | break; | |
1da177e4 LT |
430 | } |
431 | buffer[sizeof(buffer) - 1] = '\0'; | |
432 | ||
4a00ea1e | 433 | kernel_restart(buffer); |
1da177e4 LT |
434 | break; |
435 | ||
3ab83521 | 436 | #ifdef CONFIG_KEXEC |
dc009d92 | 437 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
438 | ret = kernel_kexec(); |
439 | break; | |
3ab83521 | 440 | #endif |
4a00ea1e | 441 | |
b0cb1a19 | 442 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 443 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
444 | ret = hibernate(); |
445 | break; | |
1da177e4 LT |
446 | #endif |
447 | ||
448 | default: | |
3d26dcf7 AK |
449 | ret = -EINVAL; |
450 | break; | |
1da177e4 | 451 | } |
6f15fa50 | 452 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 453 | return ret; |
1da177e4 LT |
454 | } |
455 | ||
65f27f38 | 456 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 457 | { |
abcd9e51 | 458 | kernel_restart(NULL); |
1da177e4 LT |
459 | } |
460 | ||
461 | /* | |
462 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
463 | * As it's called within an interrupt, it may NOT sync: the only choice | |
464 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
465 | */ | |
466 | void ctrl_alt_del(void) | |
467 | { | |
65f27f38 | 468 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
469 | |
470 | if (C_A_D) | |
471 | schedule_work(&cad_work); | |
472 | else | |
9ec52099 | 473 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
474 | } |
475 | ||
1da177e4 LT |
476 | /* |
477 | * Unprivileged users may change the real gid to the effective gid | |
478 | * or vice versa. (BSD-style) | |
479 | * | |
480 | * If you set the real gid at all, or set the effective gid to a value not | |
481 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
482 | * | |
483 | * This makes it possible for a setgid program to completely drop its | |
484 | * privileges, which is often a useful assertion to make when you are doing | |
485 | * a security audit over a program. | |
486 | * | |
487 | * The general idea is that a program which uses just setregid() will be | |
488 | * 100% compatible with BSD. A program which uses just setgid() will be | |
489 | * 100% compatible with POSIX with saved IDs. | |
490 | * | |
491 | * SMP: There are not races, the GIDs are checked only by filesystem | |
492 | * operations (as far as semantic preservation is concerned). | |
493 | */ | |
ae1251ab | 494 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 495 | { |
d84f4f99 DH |
496 | const struct cred *old; |
497 | struct cred *new; | |
1da177e4 LT |
498 | int retval; |
499 | ||
d84f4f99 DH |
500 | new = prepare_creds(); |
501 | if (!new) | |
502 | return -ENOMEM; | |
503 | old = current_cred(); | |
504 | ||
d84f4f99 | 505 | retval = -EPERM; |
1da177e4 | 506 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
507 | if (old->gid == rgid || |
508 | old->egid == rgid || | |
1da177e4 | 509 | capable(CAP_SETGID)) |
d84f4f99 | 510 | new->gid = rgid; |
1da177e4 | 511 | else |
d84f4f99 | 512 | goto error; |
1da177e4 LT |
513 | } |
514 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
515 | if (old->gid == egid || |
516 | old->egid == egid || | |
517 | old->sgid == egid || | |
1da177e4 | 518 | capable(CAP_SETGID)) |
d84f4f99 | 519 | new->egid = egid; |
756184b7 | 520 | else |
d84f4f99 | 521 | goto error; |
1da177e4 | 522 | } |
d84f4f99 | 523 | |
1da177e4 | 524 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
525 | (egid != (gid_t) -1 && egid != old->gid)) |
526 | new->sgid = new->egid; | |
527 | new->fsgid = new->egid; | |
528 | ||
529 | return commit_creds(new); | |
530 | ||
531 | error: | |
532 | abort_creds(new); | |
533 | return retval; | |
1da177e4 LT |
534 | } |
535 | ||
536 | /* | |
537 | * setgid() is implemented like SysV w/ SAVED_IDS | |
538 | * | |
539 | * SMP: Same implicit races as above. | |
540 | */ | |
ae1251ab | 541 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 542 | { |
d84f4f99 DH |
543 | const struct cred *old; |
544 | struct cred *new; | |
1da177e4 LT |
545 | int retval; |
546 | ||
d84f4f99 DH |
547 | new = prepare_creds(); |
548 | if (!new) | |
549 | return -ENOMEM; | |
550 | old = current_cred(); | |
551 | ||
d84f4f99 DH |
552 | retval = -EPERM; |
553 | if (capable(CAP_SETGID)) | |
554 | new->gid = new->egid = new->sgid = new->fsgid = gid; | |
555 | else if (gid == old->gid || gid == old->sgid) | |
556 | new->egid = new->fsgid = gid; | |
1da177e4 | 557 | else |
d84f4f99 | 558 | goto error; |
1da177e4 | 559 | |
d84f4f99 DH |
560 | return commit_creds(new); |
561 | ||
562 | error: | |
563 | abort_creds(new); | |
564 | return retval; | |
1da177e4 | 565 | } |
54e99124 | 566 | |
d84f4f99 DH |
567 | /* |
568 | * change the user struct in a credentials set to match the new UID | |
569 | */ | |
570 | static int set_user(struct cred *new) | |
1da177e4 LT |
571 | { |
572 | struct user_struct *new_user; | |
573 | ||
18b6e041 | 574 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
575 | if (!new_user) |
576 | return -EAGAIN; | |
577 | ||
78d7d407 | 578 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
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 | ||
d84f4f99 | 615 | retval = -EPERM; |
1da177e4 | 616 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
617 | new->uid = ruid; |
618 | if (old->uid != ruid && | |
619 | old->euid != ruid && | |
1da177e4 | 620 | !capable(CAP_SETUID)) |
d84f4f99 | 621 | goto error; |
1da177e4 LT |
622 | } |
623 | ||
624 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
625 | new->euid = euid; |
626 | if (old->uid != euid && | |
627 | old->euid != euid && | |
628 | old->suid != euid && | |
1da177e4 | 629 | !capable(CAP_SETUID)) |
d84f4f99 | 630 | goto error; |
1da177e4 LT |
631 | } |
632 | ||
54e99124 DG |
633 | if (new->uid != old->uid) { |
634 | retval = set_user(new); | |
635 | if (retval < 0) | |
636 | goto error; | |
637 | } | |
1da177e4 | 638 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
639 | (euid != (uid_t) -1 && euid != old->uid)) |
640 | new->suid = new->euid; | |
641 | new->fsuid = new->euid; | |
1da177e4 | 642 | |
d84f4f99 DH |
643 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
644 | if (retval < 0) | |
645 | goto error; | |
1da177e4 | 646 | |
d84f4f99 | 647 | return commit_creds(new); |
1da177e4 | 648 | |
d84f4f99 DH |
649 | error: |
650 | abort_creds(new); | |
651 | return retval; | |
652 | } | |
1da177e4 LT |
653 | |
654 | /* | |
655 | * setuid() is implemented like SysV with SAVED_IDS | |
656 | * | |
657 | * Note that SAVED_ID's is deficient in that a setuid root program | |
658 | * like sendmail, for example, cannot set its uid to be a normal | |
659 | * user and then switch back, because if you're root, setuid() sets | |
660 | * the saved uid too. If you don't like this, blame the bright people | |
661 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
662 | * will allow a root program to temporarily drop privileges and be able to | |
663 | * regain them by swapping the real and effective uid. | |
664 | */ | |
ae1251ab | 665 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 666 | { |
d84f4f99 DH |
667 | const struct cred *old; |
668 | struct cred *new; | |
1da177e4 LT |
669 | int retval; |
670 | ||
d84f4f99 DH |
671 | new = prepare_creds(); |
672 | if (!new) | |
673 | return -ENOMEM; | |
674 | old = current_cred(); | |
675 | ||
d84f4f99 | 676 | retval = -EPERM; |
1da177e4 | 677 | if (capable(CAP_SETUID)) { |
d84f4f99 | 678 | new->suid = new->uid = uid; |
54e99124 DG |
679 | if (uid != old->uid) { |
680 | retval = set_user(new); | |
681 | if (retval < 0) | |
682 | goto error; | |
d84f4f99 DH |
683 | } |
684 | } else if (uid != old->uid && uid != new->suid) { | |
685 | goto error; | |
1da177e4 | 686 | } |
1da177e4 | 687 | |
d84f4f99 DH |
688 | new->fsuid = new->euid = uid; |
689 | ||
690 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
691 | if (retval < 0) | |
692 | goto error; | |
1da177e4 | 693 | |
d84f4f99 | 694 | return commit_creds(new); |
1da177e4 | 695 | |
d84f4f99 DH |
696 | error: |
697 | abort_creds(new); | |
698 | return retval; | |
1da177e4 LT |
699 | } |
700 | ||
701 | ||
702 | /* | |
703 | * This function implements a generic ability to update ruid, euid, | |
704 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
705 | */ | |
ae1251ab | 706 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 707 | { |
d84f4f99 DH |
708 | const struct cred *old; |
709 | struct cred *new; | |
1da177e4 LT |
710 | int retval; |
711 | ||
d84f4f99 DH |
712 | new = prepare_creds(); |
713 | if (!new) | |
714 | return -ENOMEM; | |
715 | ||
d84f4f99 | 716 | old = current_cred(); |
1da177e4 | 717 | |
d84f4f99 | 718 | retval = -EPERM; |
1da177e4 | 719 | if (!capable(CAP_SETUID)) { |
d84f4f99 DH |
720 | if (ruid != (uid_t) -1 && ruid != old->uid && |
721 | ruid != old->euid && ruid != old->suid) | |
722 | goto error; | |
723 | if (euid != (uid_t) -1 && euid != old->uid && | |
724 | euid != old->euid && euid != old->suid) | |
725 | goto error; | |
726 | if (suid != (uid_t) -1 && suid != old->uid && | |
727 | suid != old->euid && suid != old->suid) | |
728 | goto error; | |
1da177e4 | 729 | } |
d84f4f99 | 730 | |
1da177e4 | 731 | if (ruid != (uid_t) -1) { |
d84f4f99 | 732 | new->uid = ruid; |
54e99124 DG |
733 | if (ruid != old->uid) { |
734 | retval = set_user(new); | |
735 | if (retval < 0) | |
736 | goto error; | |
737 | } | |
1da177e4 | 738 | } |
d84f4f99 DH |
739 | if (euid != (uid_t) -1) |
740 | new->euid = euid; | |
1da177e4 | 741 | if (suid != (uid_t) -1) |
d84f4f99 DH |
742 | new->suid = suid; |
743 | new->fsuid = new->euid; | |
1da177e4 | 744 | |
d84f4f99 DH |
745 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
746 | if (retval < 0) | |
747 | goto error; | |
1da177e4 | 748 | |
d84f4f99 | 749 | return commit_creds(new); |
1da177e4 | 750 | |
d84f4f99 DH |
751 | error: |
752 | abort_creds(new); | |
753 | return retval; | |
1da177e4 LT |
754 | } |
755 | ||
dbf040d9 | 756 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 757 | { |
86a264ab | 758 | const struct cred *cred = current_cred(); |
1da177e4 LT |
759 | int retval; |
760 | ||
86a264ab DH |
761 | if (!(retval = put_user(cred->uid, ruid)) && |
762 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 763 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
764 | |
765 | return retval; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Same as above, but for rgid, egid, sgid. | |
770 | */ | |
ae1251ab | 771 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 772 | { |
d84f4f99 DH |
773 | const struct cred *old; |
774 | struct cred *new; | |
1da177e4 LT |
775 | int retval; |
776 | ||
d84f4f99 DH |
777 | new = prepare_creds(); |
778 | if (!new) | |
779 | return -ENOMEM; | |
780 | old = current_cred(); | |
781 | ||
d84f4f99 | 782 | retval = -EPERM; |
1da177e4 | 783 | if (!capable(CAP_SETGID)) { |
d84f4f99 DH |
784 | if (rgid != (gid_t) -1 && rgid != old->gid && |
785 | rgid != old->egid && rgid != old->sgid) | |
786 | goto error; | |
787 | if (egid != (gid_t) -1 && egid != old->gid && | |
788 | egid != old->egid && egid != old->sgid) | |
789 | goto error; | |
790 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
791 | sgid != old->egid && sgid != old->sgid) | |
792 | goto error; | |
1da177e4 | 793 | } |
d84f4f99 | 794 | |
1da177e4 | 795 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
796 | new->gid = rgid; |
797 | if (egid != (gid_t) -1) | |
798 | new->egid = egid; | |
1da177e4 | 799 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
800 | new->sgid = sgid; |
801 | new->fsgid = new->egid; | |
1da177e4 | 802 | |
d84f4f99 DH |
803 | return commit_creds(new); |
804 | ||
805 | error: | |
806 | abort_creds(new); | |
807 | return retval; | |
1da177e4 LT |
808 | } |
809 | ||
dbf040d9 | 810 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 811 | { |
86a264ab | 812 | const struct cred *cred = current_cred(); |
1da177e4 LT |
813 | int retval; |
814 | ||
86a264ab DH |
815 | if (!(retval = put_user(cred->gid, rgid)) && |
816 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 817 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
818 | |
819 | return retval; | |
820 | } | |
821 | ||
822 | ||
823 | /* | |
824 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
825 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
826 | * whatever uid it wants to). It normally shadows "euid", except when | |
827 | * explicitly set by setfsuid() or for access.. | |
828 | */ | |
ae1251ab | 829 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 830 | { |
d84f4f99 DH |
831 | const struct cred *old; |
832 | struct cred *new; | |
833 | uid_t old_fsuid; | |
1da177e4 | 834 | |
d84f4f99 DH |
835 | new = prepare_creds(); |
836 | if (!new) | |
837 | return current_fsuid(); | |
838 | old = current_cred(); | |
839 | old_fsuid = old->fsuid; | |
1da177e4 | 840 | |
d84f4f99 DH |
841 | if (uid == old->uid || uid == old->euid || |
842 | uid == old->suid || uid == old->fsuid || | |
756184b7 CP |
843 | capable(CAP_SETUID)) { |
844 | if (uid != old_fsuid) { | |
d84f4f99 DH |
845 | new->fsuid = uid; |
846 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
847 | goto change_okay; | |
1da177e4 | 848 | } |
1da177e4 LT |
849 | } |
850 | ||
d84f4f99 DH |
851 | abort_creds(new); |
852 | return old_fsuid; | |
1da177e4 | 853 | |
d84f4f99 DH |
854 | change_okay: |
855 | commit_creds(new); | |
1da177e4 LT |
856 | return old_fsuid; |
857 | } | |
858 | ||
859 | /* | |
f42df9e6 | 860 | * Samma på svenska.. |
1da177e4 | 861 | */ |
ae1251ab | 862 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 863 | { |
d84f4f99 DH |
864 | const struct cred *old; |
865 | struct cred *new; | |
866 | gid_t old_fsgid; | |
867 | ||
868 | new = prepare_creds(); | |
869 | if (!new) | |
870 | return current_fsgid(); | |
871 | old = current_cred(); | |
872 | old_fsgid = old->fsgid; | |
1da177e4 | 873 | |
d84f4f99 DH |
874 | if (gid == old->gid || gid == old->egid || |
875 | gid == old->sgid || gid == old->fsgid || | |
756184b7 CP |
876 | capable(CAP_SETGID)) { |
877 | if (gid != old_fsgid) { | |
d84f4f99 DH |
878 | new->fsgid = gid; |
879 | goto change_okay; | |
1da177e4 | 880 | } |
1da177e4 | 881 | } |
d84f4f99 | 882 | |
d84f4f99 DH |
883 | abort_creds(new); |
884 | return old_fsgid; | |
885 | ||
886 | change_okay: | |
887 | commit_creds(new); | |
1da177e4 LT |
888 | return old_fsgid; |
889 | } | |
890 | ||
f06febc9 FM |
891 | void do_sys_times(struct tms *tms) |
892 | { | |
0cf55e1e | 893 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 894 | |
2b5fe6de | 895 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 896 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
897 | cutime = current->signal->cutime; |
898 | cstime = current->signal->cstime; | |
899 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
900 | tms->tms_utime = cputime_to_clock_t(tgutime); |
901 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
902 | tms->tms_cutime = cputime_to_clock_t(cutime); |
903 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
904 | } | |
905 | ||
58fd3aa2 | 906 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 907 | { |
1da177e4 LT |
908 | if (tbuf) { |
909 | struct tms tmp; | |
f06febc9 FM |
910 | |
911 | do_sys_times(&tmp); | |
1da177e4 LT |
912 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
913 | return -EFAULT; | |
914 | } | |
e3d5a27d | 915 | force_successful_syscall_return(); |
1da177e4 LT |
916 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
917 | } | |
918 | ||
919 | /* | |
920 | * This needs some heavy checking ... | |
921 | * I just haven't the stomach for it. I also don't fully | |
922 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
923 | * | |
924 | * OK, I think I have the protection semantics right.... this is really | |
925 | * only important on a multi-user system anyway, to make sure one user | |
926 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
927 | * | |
928 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
929 | * LBT 04.03.94 | |
930 | */ | |
b290ebe2 | 931 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
932 | { |
933 | struct task_struct *p; | |
ee0acf90 | 934 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
935 | struct pid *pgrp; |
936 | int err; | |
1da177e4 LT |
937 | |
938 | if (!pid) | |
b488893a | 939 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
940 | if (!pgid) |
941 | pgid = pid; | |
942 | if (pgid < 0) | |
943 | return -EINVAL; | |
950eaaca | 944 | rcu_read_lock(); |
1da177e4 LT |
945 | |
946 | /* From this point forward we keep holding onto the tasklist lock | |
947 | * so that our parent does not change from under us. -DaveM | |
948 | */ | |
949 | write_lock_irq(&tasklist_lock); | |
950 | ||
951 | err = -ESRCH; | |
4e021306 | 952 | p = find_task_by_vpid(pid); |
1da177e4 LT |
953 | if (!p) |
954 | goto out; | |
955 | ||
956 | err = -EINVAL; | |
957 | if (!thread_group_leader(p)) | |
958 | goto out; | |
959 | ||
4e021306 | 960 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 961 | err = -EPERM; |
41487c65 | 962 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
963 | goto out; |
964 | err = -EACCES; | |
965 | if (p->did_exec) | |
966 | goto out; | |
967 | } else { | |
968 | err = -ESRCH; | |
ee0acf90 | 969 | if (p != group_leader) |
1da177e4 LT |
970 | goto out; |
971 | } | |
972 | ||
973 | err = -EPERM; | |
974 | if (p->signal->leader) | |
975 | goto out; | |
976 | ||
4e021306 | 977 | pgrp = task_pid(p); |
1da177e4 | 978 | if (pgid != pid) { |
b488893a | 979 | struct task_struct *g; |
1da177e4 | 980 | |
4e021306 ON |
981 | pgrp = find_vpid(pgid); |
982 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 983 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 984 | goto out; |
1da177e4 LT |
985 | } |
986 | ||
1da177e4 LT |
987 | err = security_task_setpgid(p, pgid); |
988 | if (err) | |
989 | goto out; | |
990 | ||
1b0f7ffd | 991 | if (task_pgrp(p) != pgrp) |
83beaf3c | 992 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
993 | |
994 | err = 0; | |
995 | out: | |
996 | /* All paths lead to here, thus we are safe. -DaveM */ | |
997 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 998 | rcu_read_unlock(); |
1da177e4 LT |
999 | return err; |
1000 | } | |
1001 | ||
dbf040d9 | 1002 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1003 | { |
12a3de0a ON |
1004 | struct task_struct *p; |
1005 | struct pid *grp; | |
1006 | int retval; | |
1007 | ||
1008 | rcu_read_lock(); | |
756184b7 | 1009 | if (!pid) |
12a3de0a | 1010 | grp = task_pgrp(current); |
756184b7 | 1011 | else { |
1da177e4 | 1012 | retval = -ESRCH; |
12a3de0a ON |
1013 | p = find_task_by_vpid(pid); |
1014 | if (!p) | |
1015 | goto out; | |
1016 | grp = task_pgrp(p); | |
1017 | if (!grp) | |
1018 | goto out; | |
1019 | ||
1020 | retval = security_task_getpgid(p); | |
1021 | if (retval) | |
1022 | goto out; | |
1da177e4 | 1023 | } |
12a3de0a ON |
1024 | retval = pid_vnr(grp); |
1025 | out: | |
1026 | rcu_read_unlock(); | |
1027 | return retval; | |
1da177e4 LT |
1028 | } |
1029 | ||
1030 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1031 | ||
dbf040d9 | 1032 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1033 | { |
12a3de0a | 1034 | return sys_getpgid(0); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | #endif | |
1038 | ||
dbf040d9 | 1039 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1040 | { |
1dd768c0 ON |
1041 | struct task_struct *p; |
1042 | struct pid *sid; | |
1043 | int retval; | |
1044 | ||
1045 | rcu_read_lock(); | |
756184b7 | 1046 | if (!pid) |
1dd768c0 | 1047 | sid = task_session(current); |
756184b7 | 1048 | else { |
1da177e4 | 1049 | retval = -ESRCH; |
1dd768c0 ON |
1050 | p = find_task_by_vpid(pid); |
1051 | if (!p) | |
1052 | goto out; | |
1053 | sid = task_session(p); | |
1054 | if (!sid) | |
1055 | goto out; | |
1056 | ||
1057 | retval = security_task_getsid(p); | |
1058 | if (retval) | |
1059 | goto out; | |
1da177e4 | 1060 | } |
1dd768c0 ON |
1061 | retval = pid_vnr(sid); |
1062 | out: | |
1063 | rcu_read_unlock(); | |
1064 | return retval; | |
1da177e4 LT |
1065 | } |
1066 | ||
b290ebe2 | 1067 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1068 | { |
e19f247a | 1069 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1070 | struct pid *sid = task_pid(group_leader); |
1071 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1072 | int err = -EPERM; |
1073 | ||
1da177e4 | 1074 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1075 | /* Fail if I am already a session leader */ |
1076 | if (group_leader->signal->leader) | |
1077 | goto out; | |
1078 | ||
430c6231 ON |
1079 | /* Fail if a process group id already exists that equals the |
1080 | * proposed session id. | |
390e2ff0 | 1081 | */ |
6806aac6 | 1082 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1083 | goto out; |
1084 | ||
e19f247a | 1085 | group_leader->signal->leader = 1; |
8520d7c7 | 1086 | __set_special_pids(sid); |
24ec839c | 1087 | |
9c9f4ded | 1088 | proc_clear_tty(group_leader); |
24ec839c | 1089 | |
e4cc0a9c | 1090 | err = session; |
1da177e4 LT |
1091 | out: |
1092 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1093 | if (err > 0) { |
0d0df599 | 1094 | proc_sid_connector(group_leader); |
5091faa4 MG |
1095 | sched_autogroup_create_attach(group_leader); |
1096 | } | |
1da177e4 LT |
1097 | return err; |
1098 | } | |
1099 | ||
1da177e4 LT |
1100 | DECLARE_RWSEM(uts_sem); |
1101 | ||
e28cbf22 CH |
1102 | #ifdef COMPAT_UTS_MACHINE |
1103 | #define override_architecture(name) \ | |
46da2766 | 1104 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1105 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1106 | sizeof(COMPAT_UTS_MACHINE))) | |
1107 | #else | |
1108 | #define override_architecture(name) 0 | |
1109 | #endif | |
1110 | ||
e48fbb69 | 1111 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1112 | { |
1113 | int errno = 0; | |
1114 | ||
1115 | down_read(&uts_sem); | |
e9ff3990 | 1116 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1117 | errno = -EFAULT; |
1118 | up_read(&uts_sem); | |
e28cbf22 CH |
1119 | |
1120 | if (!errno && override_architecture(name)) | |
1121 | errno = -EFAULT; | |
1da177e4 LT |
1122 | return errno; |
1123 | } | |
1124 | ||
5cacdb4a CH |
1125 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1126 | /* | |
1127 | * Old cruft | |
1128 | */ | |
1129 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1130 | { | |
1131 | int error = 0; | |
1132 | ||
1133 | if (!name) | |
1134 | return -EFAULT; | |
1135 | ||
1136 | down_read(&uts_sem); | |
1137 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1138 | error = -EFAULT; | |
1139 | up_read(&uts_sem); | |
1140 | ||
1141 | if (!error && override_architecture(name)) | |
1142 | error = -EFAULT; | |
1143 | return error; | |
1144 | } | |
1145 | ||
1146 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1147 | { | |
1148 | int error; | |
1149 | ||
1150 | if (!name) | |
1151 | return -EFAULT; | |
1152 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1153 | return -EFAULT; | |
1154 | ||
1155 | down_read(&uts_sem); | |
1156 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1157 | __OLD_UTS_LEN); | |
1158 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1159 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1160 | __OLD_UTS_LEN); | |
1161 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1162 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1163 | __OLD_UTS_LEN); | |
1164 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1165 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1166 | __OLD_UTS_LEN); | |
1167 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1168 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1169 | __OLD_UTS_LEN); | |
1170 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1171 | up_read(&uts_sem); | |
1172 | ||
1173 | if (!error && override_architecture(name)) | |
1174 | error = -EFAULT; | |
1175 | return error ? -EFAULT : 0; | |
1176 | } | |
1177 | #endif | |
1178 | ||
5a8a82b1 | 1179 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1180 | { |
1181 | int errno; | |
1182 | char tmp[__NEW_UTS_LEN]; | |
1183 | ||
bb96a6f5 | 1184 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1185 | return -EPERM; |
1186 | if (len < 0 || len > __NEW_UTS_LEN) | |
1187 | return -EINVAL; | |
1188 | down_write(&uts_sem); | |
1189 | errno = -EFAULT; | |
1190 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1191 | struct new_utsname *u = utsname(); |
1192 | ||
1193 | memcpy(u->nodename, tmp, len); | |
1194 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1195 | errno = 0; |
1196 | } | |
1197 | up_write(&uts_sem); | |
1198 | return errno; | |
1199 | } | |
1200 | ||
1201 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1202 | ||
5a8a82b1 | 1203 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1204 | { |
1205 | int i, errno; | |
9679e4dd | 1206 | struct new_utsname *u; |
1da177e4 LT |
1207 | |
1208 | if (len < 0) | |
1209 | return -EINVAL; | |
1210 | down_read(&uts_sem); | |
9679e4dd AM |
1211 | u = utsname(); |
1212 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1213 | if (i > len) |
1214 | i = len; | |
1215 | errno = 0; | |
9679e4dd | 1216 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1217 | errno = -EFAULT; |
1218 | up_read(&uts_sem); | |
1219 | return errno; | |
1220 | } | |
1221 | ||
1222 | #endif | |
1223 | ||
1224 | /* | |
1225 | * Only setdomainname; getdomainname can be implemented by calling | |
1226 | * uname() | |
1227 | */ | |
5a8a82b1 | 1228 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1229 | { |
1230 | int errno; | |
1231 | char tmp[__NEW_UTS_LEN]; | |
1232 | ||
1233 | if (!capable(CAP_SYS_ADMIN)) | |
1234 | return -EPERM; | |
1235 | if (len < 0 || len > __NEW_UTS_LEN) | |
1236 | return -EINVAL; | |
1237 | ||
1238 | down_write(&uts_sem); | |
1239 | errno = -EFAULT; | |
1240 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1241 | struct new_utsname *u = utsname(); |
1242 | ||
1243 | memcpy(u->domainname, tmp, len); | |
1244 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1245 | errno = 0; |
1246 | } | |
1247 | up_write(&uts_sem); | |
1248 | return errno; | |
1249 | } | |
1250 | ||
e48fbb69 | 1251 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1252 | { |
b9518345 JS |
1253 | struct rlimit value; |
1254 | int ret; | |
1255 | ||
1256 | ret = do_prlimit(current, resource, NULL, &value); | |
1257 | if (!ret) | |
1258 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1259 | ||
1260 | return ret; | |
1da177e4 LT |
1261 | } |
1262 | ||
1263 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1264 | ||
1265 | /* | |
1266 | * Back compatibility for getrlimit. Needed for some apps. | |
1267 | */ | |
1268 | ||
e48fbb69 HC |
1269 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1270 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1271 | { |
1272 | struct rlimit x; | |
1273 | if (resource >= RLIM_NLIMITS) | |
1274 | return -EINVAL; | |
1275 | ||
1276 | task_lock(current->group_leader); | |
1277 | x = current->signal->rlim[resource]; | |
1278 | task_unlock(current->group_leader); | |
756184b7 | 1279 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1280 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1281 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1282 | x.rlim_max = 0x7FFFFFFF; |
1283 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1284 | } | |
1285 | ||
1286 | #endif | |
1287 | ||
c022a0ac JS |
1288 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1289 | { | |
1290 | #if BITS_PER_LONG < 64 | |
1291 | return rlim64 >= ULONG_MAX; | |
1292 | #else | |
1293 | return rlim64 == RLIM64_INFINITY; | |
1294 | #endif | |
1295 | } | |
1296 | ||
1297 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1298 | { | |
1299 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1300 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1301 | else | |
1302 | rlim64->rlim_cur = rlim->rlim_cur; | |
1303 | if (rlim->rlim_max == RLIM_INFINITY) | |
1304 | rlim64->rlim_max = RLIM64_INFINITY; | |
1305 | else | |
1306 | rlim64->rlim_max = rlim->rlim_max; | |
1307 | } | |
1308 | ||
1309 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1310 | { | |
1311 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1312 | rlim->rlim_cur = RLIM_INFINITY; | |
1313 | else | |
1314 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1315 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1316 | rlim->rlim_max = RLIM_INFINITY; | |
1317 | else | |
1318 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1319 | } | |
1320 | ||
1c1e618d | 1321 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1322 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1323 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1324 | { |
5b41535a | 1325 | struct rlimit *rlim; |
86f162f4 | 1326 | int retval = 0; |
1da177e4 LT |
1327 | |
1328 | if (resource >= RLIM_NLIMITS) | |
1329 | return -EINVAL; | |
5b41535a JS |
1330 | if (new_rlim) { |
1331 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1332 | return -EINVAL; | |
1333 | if (resource == RLIMIT_NOFILE && | |
1334 | new_rlim->rlim_max > sysctl_nr_open) | |
1335 | return -EPERM; | |
1336 | } | |
1da177e4 | 1337 | |
1c1e618d JS |
1338 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1339 | read_lock(&tasklist_lock); | |
1340 | if (!tsk->sighand) { | |
1341 | retval = -ESRCH; | |
1342 | goto out; | |
1343 | } | |
1344 | ||
5b41535a | 1345 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1346 | task_lock(tsk->group_leader); |
5b41535a JS |
1347 | if (new_rlim) { |
1348 | if (new_rlim->rlim_max > rlim->rlim_max && | |
1349 | !capable(CAP_SYS_RESOURCE)) | |
1350 | retval = -EPERM; | |
1351 | if (!retval) | |
1352 | retval = security_task_setrlimit(tsk->group_leader, | |
1353 | resource, new_rlim); | |
1354 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1355 | /* | |
1356 | * The caller is asking for an immediate RLIMIT_CPU | |
1357 | * expiry. But we use the zero value to mean "it was | |
1358 | * never set". So let's cheat and make it one second | |
1359 | * instead | |
1360 | */ | |
1361 | new_rlim->rlim_cur = 1; | |
1362 | } | |
1363 | } | |
1364 | if (!retval) { | |
1365 | if (old_rlim) | |
1366 | *old_rlim = *rlim; | |
1367 | if (new_rlim) | |
1368 | *rlim = *new_rlim; | |
9926e4c7 | 1369 | } |
7855c35d | 1370 | task_unlock(tsk->group_leader); |
1da177e4 | 1371 | |
d3561f78 AM |
1372 | /* |
1373 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1374 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1375 | * very long-standing error, and fixing it now risks breakage of | |
1376 | * applications, so we live with it | |
1377 | */ | |
5b41535a JS |
1378 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
1379 | new_rlim->rlim_cur != RLIM_INFINITY) | |
1380 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); | |
ec9e16ba | 1381 | out: |
1c1e618d | 1382 | read_unlock(&tasklist_lock); |
2fb9d268 | 1383 | return retval; |
1da177e4 LT |
1384 | } |
1385 | ||
c022a0ac JS |
1386 | /* rcu lock must be held */ |
1387 | static int check_prlimit_permission(struct task_struct *task) | |
1388 | { | |
1389 | const struct cred *cred = current_cred(), *tcred; | |
1390 | ||
1391 | tcred = __task_cred(task); | |
aa5bd67d KK |
1392 | if (current != task && |
1393 | (cred->uid != tcred->euid || | |
c022a0ac JS |
1394 | cred->uid != tcred->suid || |
1395 | cred->uid != tcred->uid || | |
1396 | cred->gid != tcred->egid || | |
1397 | cred->gid != tcred->sgid || | |
1398 | cred->gid != tcred->gid) && | |
1399 | !capable(CAP_SYS_RESOURCE)) { | |
1400 | return -EPERM; | |
1401 | } | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1407 | const struct rlimit64 __user *, new_rlim, | |
1408 | struct rlimit64 __user *, old_rlim) | |
1409 | { | |
1410 | struct rlimit64 old64, new64; | |
1411 | struct rlimit old, new; | |
1412 | struct task_struct *tsk; | |
1413 | int ret; | |
1414 | ||
1415 | if (new_rlim) { | |
1416 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1417 | return -EFAULT; | |
1418 | rlim64_to_rlim(&new64, &new); | |
1419 | } | |
1420 | ||
1421 | rcu_read_lock(); | |
1422 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1423 | if (!tsk) { | |
1424 | rcu_read_unlock(); | |
1425 | return -ESRCH; | |
1426 | } | |
1427 | ret = check_prlimit_permission(tsk); | |
1428 | if (ret) { | |
1429 | rcu_read_unlock(); | |
1430 | return ret; | |
1431 | } | |
1432 | get_task_struct(tsk); | |
1433 | rcu_read_unlock(); | |
1434 | ||
1435 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1436 | old_rlim ? &old : NULL); | |
1437 | ||
1438 | if (!ret && old_rlim) { | |
1439 | rlim_to_rlim64(&old, &old64); | |
1440 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1441 | ret = -EFAULT; | |
1442 | } | |
1443 | ||
1444 | put_task_struct(tsk); | |
1445 | return ret; | |
1446 | } | |
1447 | ||
7855c35d JS |
1448 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1449 | { | |
1450 | struct rlimit new_rlim; | |
1451 | ||
1452 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1453 | return -EFAULT; | |
5b41535a | 1454 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1455 | } |
1456 | ||
1da177e4 LT |
1457 | /* |
1458 | * It would make sense to put struct rusage in the task_struct, | |
1459 | * except that would make the task_struct be *really big*. After | |
1460 | * task_struct gets moved into malloc'ed memory, it would | |
1461 | * make sense to do this. It will make moving the rest of the information | |
1462 | * a lot simpler! (Which we're not doing right now because we're not | |
1463 | * measuring them yet). | |
1464 | * | |
1da177e4 LT |
1465 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1466 | * races with threads incrementing their own counters. But since word | |
1467 | * reads are atomic, we either get new values or old values and we don't | |
1468 | * care which for the sums. We always take the siglock to protect reading | |
1469 | * the c* fields from p->signal from races with exit.c updating those | |
1470 | * fields when reaping, so a sample either gets all the additions of a | |
1471 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1472 | * |
de047c1b RT |
1473 | * Locking: |
1474 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1475 | * for the cases current multithreaded, non-current single threaded | |
1476 | * non-current multithreaded. Thread traversal is now safe with | |
1477 | * the siglock held. | |
1478 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1479 | * single threaded, as no one else can take our signal_struct away, no one | |
1480 | * else can reap the children to update signal->c* counters, and no one else | |
1481 | * can race with the signal-> fields. If we do not take any lock, the | |
1482 | * signal-> fields could be read out of order while another thread was just | |
1483 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1484 | * On the writer side, write memory barrier is implied in __exit_signal | |
1485 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1486 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1487 | * |
1da177e4 LT |
1488 | */ |
1489 | ||
f06febc9 | 1490 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1491 | { |
679c9cd4 SK |
1492 | r->ru_nvcsw += t->nvcsw; |
1493 | r->ru_nivcsw += t->nivcsw; | |
1494 | r->ru_minflt += t->min_flt; | |
1495 | r->ru_majflt += t->maj_flt; | |
1496 | r->ru_inblock += task_io_get_inblock(t); | |
1497 | r->ru_oublock += task_io_get_oublock(t); | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1501 | { | |
1502 | struct task_struct *t; | |
1503 | unsigned long flags; | |
0cf55e1e | 1504 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1505 | unsigned long maxrss = 0; |
1da177e4 LT |
1506 | |
1507 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1508 | utime = stime = cputime_zero; |
1da177e4 | 1509 | |
679c9cd4 | 1510 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1511 | task_times(current, &utime, &stime); |
f06febc9 | 1512 | accumulate_thread_rusage(p, r); |
1f10206c | 1513 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1514 | goto out; |
1515 | } | |
1516 | ||
d6cf723a | 1517 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1518 | return; |
0f59cc4a | 1519 | |
1da177e4 | 1520 | switch (who) { |
0f59cc4a | 1521 | case RUSAGE_BOTH: |
1da177e4 | 1522 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1523 | utime = p->signal->cutime; |
1524 | stime = p->signal->cstime; | |
1525 | r->ru_nvcsw = p->signal->cnvcsw; | |
1526 | r->ru_nivcsw = p->signal->cnivcsw; | |
1527 | r->ru_minflt = p->signal->cmin_flt; | |
1528 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1529 | r->ru_inblock = p->signal->cinblock; |
1530 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1531 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1532 | |
1533 | if (who == RUSAGE_CHILDREN) | |
1534 | break; | |
1535 | ||
1da177e4 | 1536 | case RUSAGE_SELF: |
0cf55e1e HS |
1537 | thread_group_times(p, &tgutime, &tgstime); |
1538 | utime = cputime_add(utime, tgutime); | |
1539 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1540 | r->ru_nvcsw += p->signal->nvcsw; |
1541 | r->ru_nivcsw += p->signal->nivcsw; | |
1542 | r->ru_minflt += p->signal->min_flt; | |
1543 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1544 | r->ru_inblock += p->signal->inblock; |
1545 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1546 | if (maxrss < p->signal->maxrss) |
1547 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1548 | t = p; |
1549 | do { | |
f06febc9 | 1550 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1551 | t = next_thread(t); |
1552 | } while (t != p); | |
1da177e4 | 1553 | break; |
0f59cc4a | 1554 | |
1da177e4 LT |
1555 | default: |
1556 | BUG(); | |
1557 | } | |
de047c1b | 1558 | unlock_task_sighand(p, &flags); |
de047c1b | 1559 | |
679c9cd4 | 1560 | out: |
0f59cc4a ON |
1561 | cputime_to_timeval(utime, &r->ru_utime); |
1562 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1563 | |
1564 | if (who != RUSAGE_CHILDREN) { | |
1565 | struct mm_struct *mm = get_task_mm(p); | |
1566 | if (mm) { | |
1567 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1568 | mmput(mm); | |
1569 | } | |
1570 | } | |
1571 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1572 | } |
1573 | ||
1574 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1575 | { | |
1576 | struct rusage r; | |
1da177e4 | 1577 | k_getrusage(p, who, &r); |
1da177e4 LT |
1578 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1579 | } | |
1580 | ||
e48fbb69 | 1581 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1582 | { |
679c9cd4 SK |
1583 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1584 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1585 | return -EINVAL; |
1586 | return getrusage(current, who, ru); | |
1587 | } | |
1588 | ||
e48fbb69 | 1589 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1590 | { |
1591 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1592 | return mask; | |
1593 | } | |
3b7391de | 1594 | |
c4ea37c2 HC |
1595 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1596 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1597 | { |
b6dff3ec DH |
1598 | struct task_struct *me = current; |
1599 | unsigned char comm[sizeof(me->comm)]; | |
1600 | long error; | |
1da177e4 | 1601 | |
d84f4f99 DH |
1602 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1603 | if (error != -ENOSYS) | |
1da177e4 LT |
1604 | return error; |
1605 | ||
d84f4f99 | 1606 | error = 0; |
1da177e4 LT |
1607 | switch (option) { |
1608 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1609 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1610 | error = -EINVAL; |
1611 | break; | |
1612 | } | |
b6dff3ec DH |
1613 | me->pdeath_signal = arg2; |
1614 | error = 0; | |
1da177e4 LT |
1615 | break; |
1616 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1617 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1618 | break; |
1619 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1620 | error = get_dumpable(me->mm); |
1da177e4 LT |
1621 | break; |
1622 | case PR_SET_DUMPABLE: | |
abf75a50 | 1623 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1624 | error = -EINVAL; |
1625 | break; | |
1626 | } | |
b6dff3ec DH |
1627 | set_dumpable(me->mm, arg2); |
1628 | error = 0; | |
1da177e4 LT |
1629 | break; |
1630 | ||
1631 | case PR_SET_UNALIGN: | |
b6dff3ec | 1632 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1633 | break; |
1634 | case PR_GET_UNALIGN: | |
b6dff3ec | 1635 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1636 | break; |
1637 | case PR_SET_FPEMU: | |
b6dff3ec | 1638 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1639 | break; |
1640 | case PR_GET_FPEMU: | |
b6dff3ec | 1641 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1642 | break; |
1643 | case PR_SET_FPEXC: | |
b6dff3ec | 1644 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1645 | break; |
1646 | case PR_GET_FPEXC: | |
b6dff3ec | 1647 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1648 | break; |
1649 | case PR_GET_TIMING: | |
1650 | error = PR_TIMING_STATISTICAL; | |
1651 | break; | |
1652 | case PR_SET_TIMING: | |
7b26655f | 1653 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1654 | error = -EINVAL; |
b6dff3ec DH |
1655 | else |
1656 | error = 0; | |
1da177e4 LT |
1657 | break; |
1658 | ||
b6dff3ec DH |
1659 | case PR_SET_NAME: |
1660 | comm[sizeof(me->comm)-1] = 0; | |
1661 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1662 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1663 | return -EFAULT; |
b6dff3ec | 1664 | set_task_comm(me, comm); |
1da177e4 | 1665 | return 0; |
b6dff3ec DH |
1666 | case PR_GET_NAME: |
1667 | get_task_comm(comm, me); | |
1668 | if (copy_to_user((char __user *)arg2, comm, | |
1669 | sizeof(comm))) | |
1da177e4 LT |
1670 | return -EFAULT; |
1671 | return 0; | |
651d765d | 1672 | case PR_GET_ENDIAN: |
b6dff3ec | 1673 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1674 | break; |
1675 | case PR_SET_ENDIAN: | |
b6dff3ec | 1676 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1677 | break; |
1678 | ||
1d9d02fe AA |
1679 | case PR_GET_SECCOMP: |
1680 | error = prctl_get_seccomp(); | |
1681 | break; | |
1682 | case PR_SET_SECCOMP: | |
1683 | error = prctl_set_seccomp(arg2); | |
1684 | break; | |
8fb402bc EB |
1685 | case PR_GET_TSC: |
1686 | error = GET_TSC_CTL(arg2); | |
1687 | break; | |
1688 | case PR_SET_TSC: | |
1689 | error = SET_TSC_CTL(arg2); | |
1690 | break; | |
cdd6c482 IM |
1691 | case PR_TASK_PERF_EVENTS_DISABLE: |
1692 | error = perf_event_task_disable(); | |
1d1c7ddb | 1693 | break; |
cdd6c482 IM |
1694 | case PR_TASK_PERF_EVENTS_ENABLE: |
1695 | error = perf_event_task_enable(); | |
1d1c7ddb | 1696 | break; |
6976675d AV |
1697 | case PR_GET_TIMERSLACK: |
1698 | error = current->timer_slack_ns; | |
1699 | break; | |
1700 | case PR_SET_TIMERSLACK: | |
1701 | if (arg2 <= 0) | |
1702 | current->timer_slack_ns = | |
1703 | current->default_timer_slack_ns; | |
1704 | else | |
1705 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1706 | error = 0; |
6976675d | 1707 | break; |
4db96cf0 AK |
1708 | case PR_MCE_KILL: |
1709 | if (arg4 | arg5) | |
1710 | return -EINVAL; | |
1711 | switch (arg2) { | |
1087e9b4 | 1712 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1713 | if (arg3 != 0) |
1714 | return -EINVAL; | |
1715 | current->flags &= ~PF_MCE_PROCESS; | |
1716 | break; | |
1087e9b4 | 1717 | case PR_MCE_KILL_SET: |
4db96cf0 | 1718 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1719 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1720 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1721 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1722 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1723 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1724 | current->flags &= | |
1725 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1726 | else | |
1727 | return -EINVAL; | |
4db96cf0 AK |
1728 | break; |
1729 | default: | |
1730 | return -EINVAL; | |
1731 | } | |
1732 | error = 0; | |
1733 | break; | |
1087e9b4 AK |
1734 | case PR_MCE_KILL_GET: |
1735 | if (arg2 | arg3 | arg4 | arg5) | |
1736 | return -EINVAL; | |
1737 | if (current->flags & PF_MCE_PROCESS) | |
1738 | error = (current->flags & PF_MCE_EARLY) ? | |
1739 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1740 | else | |
1741 | error = PR_MCE_KILL_DEFAULT; | |
1742 | break; | |
1da177e4 LT |
1743 | default: |
1744 | error = -EINVAL; | |
1745 | break; | |
1746 | } | |
1747 | return error; | |
1748 | } | |
3cfc348b | 1749 | |
836f92ad HC |
1750 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1751 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1752 | { |
1753 | int err = 0; | |
1754 | int cpu = raw_smp_processor_id(); | |
1755 | if (cpup) | |
1756 | err |= put_user(cpu, cpup); | |
1757 | if (nodep) | |
1758 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1759 | return err ? -EFAULT : 0; |
1760 | } | |
10a0a8d4 JF |
1761 | |
1762 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1763 | ||
a06a4dc3 | 1764 | static void argv_cleanup(struct subprocess_info *info) |
10a0a8d4 | 1765 | { |
a06a4dc3 | 1766 | argv_free(info->argv); |
10a0a8d4 JF |
1767 | } |
1768 | ||
1769 | /** | |
1770 | * orderly_poweroff - Trigger an orderly system poweroff | |
1771 | * @force: force poweroff if command execution fails | |
1772 | * | |
1773 | * This may be called from any context to trigger a system shutdown. | |
1774 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1775 | */ | |
1776 | int orderly_poweroff(bool force) | |
1777 | { | |
1778 | int argc; | |
1779 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1780 | static char *envp[] = { | |
1781 | "HOME=/", | |
1782 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1783 | NULL | |
1784 | }; | |
1785 | int ret = -ENOMEM; | |
1786 | struct subprocess_info *info; | |
1787 | ||
1788 | if (argv == NULL) { | |
1789 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1790 | __func__, poweroff_cmd); | |
1791 | goto out; | |
1792 | } | |
1793 | ||
ac331d15 | 1794 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1795 | if (info == NULL) { |
1796 | argv_free(argv); | |
1797 | goto out; | |
1798 | } | |
1799 | ||
a06a4dc3 | 1800 | call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
10a0a8d4 | 1801 | |
86313c48 | 1802 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1803 | |
1804 | out: | |
1805 | if (ret && force) { | |
1806 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1807 | "forcing the issue\n"); | |
1808 | ||
1809 | /* I guess this should try to kick off some daemon to | |
1810 | sync and poweroff asap. Or not even bother syncing | |
1811 | if we're doing an emergency shutdown? */ | |
1812 | emergency_sync(); | |
1813 | kernel_power_off(); | |
1814 | } | |
1815 | ||
1816 | return ret; | |
1817 | } | |
1818 | EXPORT_SYMBOL_GPL(orderly_poweroff); |