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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 | |
fc832ad3 SH |
122 | /* |
123 | * Returns true if current's euid is same as p's uid or euid, | |
124 | * or has CAP_SYS_NICE to p's user_ns. | |
125 | * | |
126 | * Called with rcu_read_lock, creds are safe | |
127 | */ | |
128 | static bool set_one_prio_perm(struct task_struct *p) | |
129 | { | |
130 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
131 | ||
132 | if (pcred->user->user_ns == cred->user->user_ns && | |
133 | (pcred->uid == cred->euid || | |
134 | pcred->euid == cred->euid)) | |
135 | return true; | |
136 | if (ns_capable(pcred->user->user_ns, CAP_SYS_NICE)) | |
137 | return true; | |
138 | return false; | |
139 | } | |
140 | ||
c69e8d9c DH |
141 | /* |
142 | * set the priority of a task | |
143 | * - the caller must hold the RCU read lock | |
144 | */ | |
1da177e4 LT |
145 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
146 | { | |
147 | int no_nice; | |
148 | ||
fc832ad3 | 149 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
150 | error = -EPERM; |
151 | goto out; | |
152 | } | |
e43379f1 | 153 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
154 | error = -EACCES; |
155 | goto out; | |
156 | } | |
157 | no_nice = security_task_setnice(p, niceval); | |
158 | if (no_nice) { | |
159 | error = no_nice; | |
160 | goto out; | |
161 | } | |
162 | if (error == -ESRCH) | |
163 | error = 0; | |
164 | set_user_nice(p, niceval); | |
165 | out: | |
166 | return error; | |
167 | } | |
168 | ||
754fe8d2 | 169 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
170 | { |
171 | struct task_struct *g, *p; | |
172 | struct user_struct *user; | |
86a264ab | 173 | const struct cred *cred = current_cred(); |
1da177e4 | 174 | int error = -EINVAL; |
41487c65 | 175 | struct pid *pgrp; |
1da177e4 | 176 | |
3e88c553 | 177 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
178 | goto out; |
179 | ||
180 | /* normalize: avoid signed division (rounding problems) */ | |
181 | error = -ESRCH; | |
182 | if (niceval < -20) | |
183 | niceval = -20; | |
184 | if (niceval > 19) | |
185 | niceval = 19; | |
186 | ||
d4581a23 | 187 | rcu_read_lock(); |
1da177e4 LT |
188 | read_lock(&tasklist_lock); |
189 | switch (which) { | |
190 | case PRIO_PROCESS: | |
41487c65 | 191 | if (who) |
228ebcbe | 192 | p = find_task_by_vpid(who); |
41487c65 EB |
193 | else |
194 | p = current; | |
1da177e4 LT |
195 | if (p) |
196 | error = set_one_prio(p, niceval, error); | |
197 | break; | |
198 | case PRIO_PGRP: | |
41487c65 | 199 | if (who) |
b488893a | 200 | pgrp = find_vpid(who); |
41487c65 EB |
201 | else |
202 | pgrp = task_pgrp(current); | |
2d70b68d | 203 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 204 | error = set_one_prio(p, niceval, error); |
2d70b68d | 205 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
206 | break; |
207 | case PRIO_USER: | |
d84f4f99 | 208 | user = (struct user_struct *) cred->user; |
1da177e4 | 209 | if (!who) |
86a264ab DH |
210 | who = cred->uid; |
211 | else if ((who != cred->uid) && | |
212 | !(user = find_user(who))) | |
213 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 214 | |
dfc6a736 | 215 | do_each_thread(g, p) { |
86a264ab | 216 | if (__task_cred(p)->uid == who) |
1da177e4 | 217 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 218 | } while_each_thread(g, p); |
86a264ab | 219 | if (who != cred->uid) |
1da177e4 LT |
220 | free_uid(user); /* For find_user() */ |
221 | break; | |
222 | } | |
223 | out_unlock: | |
224 | read_unlock(&tasklist_lock); | |
d4581a23 | 225 | rcu_read_unlock(); |
1da177e4 LT |
226 | out: |
227 | return error; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Ugh. To avoid negative return values, "getpriority()" will | |
232 | * not return the normal nice-value, but a negated value that | |
233 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
234 | * to stay compatible. | |
235 | */ | |
754fe8d2 | 236 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
237 | { |
238 | struct task_struct *g, *p; | |
239 | struct user_struct *user; | |
86a264ab | 240 | const struct cred *cred = current_cred(); |
1da177e4 | 241 | long niceval, retval = -ESRCH; |
41487c65 | 242 | struct pid *pgrp; |
1da177e4 | 243 | |
3e88c553 | 244 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
245 | return -EINVAL; |
246 | ||
70118837 | 247 | rcu_read_lock(); |
1da177e4 LT |
248 | read_lock(&tasklist_lock); |
249 | switch (which) { | |
250 | case PRIO_PROCESS: | |
41487c65 | 251 | if (who) |
228ebcbe | 252 | p = find_task_by_vpid(who); |
41487c65 EB |
253 | else |
254 | p = current; | |
1da177e4 LT |
255 | if (p) { |
256 | niceval = 20 - task_nice(p); | |
257 | if (niceval > retval) | |
258 | retval = niceval; | |
259 | } | |
260 | break; | |
261 | case PRIO_PGRP: | |
41487c65 | 262 | if (who) |
b488893a | 263 | pgrp = find_vpid(who); |
41487c65 EB |
264 | else |
265 | pgrp = task_pgrp(current); | |
2d70b68d | 266 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
267 | niceval = 20 - task_nice(p); |
268 | if (niceval > retval) | |
269 | retval = niceval; | |
2d70b68d | 270 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
271 | break; |
272 | case PRIO_USER: | |
86a264ab | 273 | user = (struct user_struct *) cred->user; |
1da177e4 | 274 | if (!who) |
86a264ab DH |
275 | who = cred->uid; |
276 | else if ((who != cred->uid) && | |
277 | !(user = find_user(who))) | |
278 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 279 | |
dfc6a736 | 280 | do_each_thread(g, p) { |
86a264ab | 281 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
282 | niceval = 20 - task_nice(p); |
283 | if (niceval > retval) | |
284 | retval = niceval; | |
285 | } | |
dfc6a736 | 286 | } while_each_thread(g, p); |
86a264ab | 287 | if (who != cred->uid) |
1da177e4 LT |
288 | free_uid(user); /* for find_user() */ |
289 | break; | |
290 | } | |
291 | out_unlock: | |
292 | read_unlock(&tasklist_lock); | |
70118837 | 293 | rcu_read_unlock(); |
1da177e4 LT |
294 | |
295 | return retval; | |
296 | } | |
297 | ||
e4c94330 EB |
298 | /** |
299 | * emergency_restart - reboot the system | |
300 | * | |
301 | * Without shutting down any hardware or taking any locks | |
302 | * reboot the system. This is called when we know we are in | |
303 | * trouble so this is our best effort to reboot. This is | |
304 | * safe to call in interrupt context. | |
305 | */ | |
7c903473 EB |
306 | void emergency_restart(void) |
307 | { | |
04c6862c | 308 | kmsg_dump(KMSG_DUMP_EMERG); |
7c903473 EB |
309 | machine_emergency_restart(); |
310 | } | |
311 | EXPORT_SYMBOL_GPL(emergency_restart); | |
312 | ||
ca195b7f | 313 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 314 | { |
e041c683 | 315 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 316 | system_state = SYSTEM_RESTART; |
b50fa7c8 | 317 | usermodehelper_disable(); |
4a00ea1e | 318 | device_shutdown(); |
40dc166c | 319 | syscore_shutdown(); |
e4c94330 | 320 | } |
1e5d5331 RD |
321 | |
322 | /** | |
323 | * kernel_restart - reboot the system | |
324 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 325 | * or %NULL |
1e5d5331 RD |
326 | * |
327 | * Shutdown everything and perform a clean reboot. | |
328 | * This is not safe to call in interrupt context. | |
329 | */ | |
e4c94330 EB |
330 | void kernel_restart(char *cmd) |
331 | { | |
332 | kernel_restart_prepare(cmd); | |
756184b7 | 333 | if (!cmd) |
4a00ea1e | 334 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 335 | else |
4a00ea1e | 336 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
04c6862c | 337 | kmsg_dump(KMSG_DUMP_RESTART); |
4a00ea1e EB |
338 | machine_restart(cmd); |
339 | } | |
340 | EXPORT_SYMBOL_GPL(kernel_restart); | |
341 | ||
4ef7229f | 342 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 343 | { |
e041c683 | 344 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
345 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
346 | system_state = state; | |
b50fa7c8 | 347 | usermodehelper_disable(); |
729b4d4c AS |
348 | device_shutdown(); |
349 | } | |
e4c94330 EB |
350 | /** |
351 | * kernel_halt - halt the system | |
352 | * | |
353 | * Shutdown everything and perform a clean system halt. | |
354 | */ | |
e4c94330 EB |
355 | void kernel_halt(void) |
356 | { | |
729b4d4c | 357 | kernel_shutdown_prepare(SYSTEM_HALT); |
40dc166c | 358 | syscore_shutdown(); |
4a00ea1e | 359 | printk(KERN_EMERG "System halted.\n"); |
04c6862c | 360 | kmsg_dump(KMSG_DUMP_HALT); |
4a00ea1e EB |
361 | machine_halt(); |
362 | } | |
729b4d4c | 363 | |
4a00ea1e EB |
364 | EXPORT_SYMBOL_GPL(kernel_halt); |
365 | ||
e4c94330 EB |
366 | /** |
367 | * kernel_power_off - power_off the system | |
368 | * | |
369 | * Shutdown everything and perform a clean system power_off. | |
370 | */ | |
e4c94330 EB |
371 | void kernel_power_off(void) |
372 | { | |
729b4d4c | 373 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
374 | if (pm_power_off_prepare) |
375 | pm_power_off_prepare(); | |
4047727e | 376 | disable_nonboot_cpus(); |
40dc166c | 377 | syscore_shutdown(); |
4a00ea1e | 378 | printk(KERN_EMERG "Power down.\n"); |
04c6862c | 379 | kmsg_dump(KMSG_DUMP_POWEROFF); |
4a00ea1e EB |
380 | machine_power_off(); |
381 | } | |
382 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
383 | |
384 | static DEFINE_MUTEX(reboot_mutex); | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * Reboot system call: for obvious reasons only root may call it, | |
388 | * and even root needs to set up some magic numbers in the registers | |
389 | * so that some mistake won't make this reboot the whole machine. | |
390 | * You can also set the meaning of the ctrl-alt-del-key here. | |
391 | * | |
392 | * reboot doesn't sync: do that yourself before calling this. | |
393 | */ | |
754fe8d2 HC |
394 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
395 | void __user *, arg) | |
1da177e4 LT |
396 | { |
397 | char buffer[256]; | |
3d26dcf7 | 398 | int ret = 0; |
1da177e4 LT |
399 | |
400 | /* We only trust the superuser with rebooting the system. */ | |
401 | if (!capable(CAP_SYS_BOOT)) | |
402 | return -EPERM; | |
403 | ||
404 | /* For safety, we require "magic" arguments. */ | |
405 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
406 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
407 | magic2 != LINUX_REBOOT_MAGIC2A && | |
408 | magic2 != LINUX_REBOOT_MAGIC2B && | |
409 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
410 | return -EINVAL; | |
411 | ||
5e38291d EB |
412 | /* Instead of trying to make the power_off code look like |
413 | * halt when pm_power_off is not set do it the easy way. | |
414 | */ | |
415 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
416 | cmd = LINUX_REBOOT_CMD_HALT; | |
417 | ||
6f15fa50 | 418 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
419 | switch (cmd) { |
420 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 421 | kernel_restart(NULL); |
1da177e4 LT |
422 | break; |
423 | ||
424 | case LINUX_REBOOT_CMD_CAD_ON: | |
425 | C_A_D = 1; | |
426 | break; | |
427 | ||
428 | case LINUX_REBOOT_CMD_CAD_OFF: | |
429 | C_A_D = 0; | |
430 | break; | |
431 | ||
432 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 433 | kernel_halt(); |
1da177e4 | 434 | do_exit(0); |
3d26dcf7 | 435 | panic("cannot halt"); |
1da177e4 LT |
436 | |
437 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 438 | kernel_power_off(); |
1da177e4 LT |
439 | do_exit(0); |
440 | break; | |
441 | ||
442 | case LINUX_REBOOT_CMD_RESTART2: | |
443 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
444 | ret = -EFAULT; |
445 | break; | |
1da177e4 LT |
446 | } |
447 | buffer[sizeof(buffer) - 1] = '\0'; | |
448 | ||
4a00ea1e | 449 | kernel_restart(buffer); |
1da177e4 LT |
450 | break; |
451 | ||
3ab83521 | 452 | #ifdef CONFIG_KEXEC |
dc009d92 | 453 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
454 | ret = kernel_kexec(); |
455 | break; | |
3ab83521 | 456 | #endif |
4a00ea1e | 457 | |
b0cb1a19 | 458 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 459 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
460 | ret = hibernate(); |
461 | break; | |
1da177e4 LT |
462 | #endif |
463 | ||
464 | default: | |
3d26dcf7 AK |
465 | ret = -EINVAL; |
466 | break; | |
1da177e4 | 467 | } |
6f15fa50 | 468 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 469 | return ret; |
1da177e4 LT |
470 | } |
471 | ||
65f27f38 | 472 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 473 | { |
abcd9e51 | 474 | kernel_restart(NULL); |
1da177e4 LT |
475 | } |
476 | ||
477 | /* | |
478 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
479 | * As it's called within an interrupt, it may NOT sync: the only choice | |
480 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
481 | */ | |
482 | void ctrl_alt_del(void) | |
483 | { | |
65f27f38 | 484 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
485 | |
486 | if (C_A_D) | |
487 | schedule_work(&cad_work); | |
488 | else | |
9ec52099 | 489 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
490 | } |
491 | ||
1da177e4 LT |
492 | /* |
493 | * Unprivileged users may change the real gid to the effective gid | |
494 | * or vice versa. (BSD-style) | |
495 | * | |
496 | * If you set the real gid at all, or set the effective gid to a value not | |
497 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
498 | * | |
499 | * This makes it possible for a setgid program to completely drop its | |
500 | * privileges, which is often a useful assertion to make when you are doing | |
501 | * a security audit over a program. | |
502 | * | |
503 | * The general idea is that a program which uses just setregid() will be | |
504 | * 100% compatible with BSD. A program which uses just setgid() will be | |
505 | * 100% compatible with POSIX with saved IDs. | |
506 | * | |
507 | * SMP: There are not races, the GIDs are checked only by filesystem | |
508 | * operations (as far as semantic preservation is concerned). | |
509 | */ | |
ae1251ab | 510 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 511 | { |
d84f4f99 DH |
512 | const struct cred *old; |
513 | struct cred *new; | |
1da177e4 LT |
514 | int retval; |
515 | ||
d84f4f99 DH |
516 | new = prepare_creds(); |
517 | if (!new) | |
518 | return -ENOMEM; | |
519 | old = current_cred(); | |
520 | ||
d84f4f99 | 521 | retval = -EPERM; |
1da177e4 | 522 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
523 | if (old->gid == rgid || |
524 | old->egid == rgid || | |
fc832ad3 | 525 | nsown_capable(CAP_SETGID)) |
d84f4f99 | 526 | new->gid = rgid; |
1da177e4 | 527 | else |
d84f4f99 | 528 | goto error; |
1da177e4 LT |
529 | } |
530 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
531 | if (old->gid == egid || |
532 | old->egid == egid || | |
533 | old->sgid == egid || | |
fc832ad3 | 534 | nsown_capable(CAP_SETGID)) |
d84f4f99 | 535 | new->egid = egid; |
756184b7 | 536 | else |
d84f4f99 | 537 | goto error; |
1da177e4 | 538 | } |
d84f4f99 | 539 | |
1da177e4 | 540 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
541 | (egid != (gid_t) -1 && egid != old->gid)) |
542 | new->sgid = new->egid; | |
543 | new->fsgid = new->egid; | |
544 | ||
545 | return commit_creds(new); | |
546 | ||
547 | error: | |
548 | abort_creds(new); | |
549 | return retval; | |
1da177e4 LT |
550 | } |
551 | ||
552 | /* | |
553 | * setgid() is implemented like SysV w/ SAVED_IDS | |
554 | * | |
555 | * SMP: Same implicit races as above. | |
556 | */ | |
ae1251ab | 557 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 558 | { |
d84f4f99 DH |
559 | const struct cred *old; |
560 | struct cred *new; | |
1da177e4 LT |
561 | int retval; |
562 | ||
d84f4f99 DH |
563 | new = prepare_creds(); |
564 | if (!new) | |
565 | return -ENOMEM; | |
566 | old = current_cred(); | |
567 | ||
d84f4f99 | 568 | retval = -EPERM; |
fc832ad3 | 569 | if (nsown_capable(CAP_SETGID)) |
d84f4f99 DH |
570 | new->gid = new->egid = new->sgid = new->fsgid = gid; |
571 | else if (gid == old->gid || gid == old->sgid) | |
572 | new->egid = new->fsgid = gid; | |
1da177e4 | 573 | else |
d84f4f99 | 574 | goto error; |
1da177e4 | 575 | |
d84f4f99 DH |
576 | return commit_creds(new); |
577 | ||
578 | error: | |
579 | abort_creds(new); | |
580 | return retval; | |
1da177e4 | 581 | } |
54e99124 | 582 | |
d84f4f99 DH |
583 | /* |
584 | * change the user struct in a credentials set to match the new UID | |
585 | */ | |
586 | static int set_user(struct cred *new) | |
1da177e4 LT |
587 | { |
588 | struct user_struct *new_user; | |
589 | ||
18b6e041 | 590 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
591 | if (!new_user) |
592 | return -EAGAIN; | |
593 | ||
78d7d407 | 594 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
18b6e041 | 595 | new_user != INIT_USER) { |
1da177e4 LT |
596 | free_uid(new_user); |
597 | return -EAGAIN; | |
598 | } | |
599 | ||
d84f4f99 DH |
600 | free_uid(new->user); |
601 | new->user = new_user; | |
1da177e4 LT |
602 | return 0; |
603 | } | |
604 | ||
605 | /* | |
606 | * Unprivileged users may change the real uid to the effective uid | |
607 | * or vice versa. (BSD-style) | |
608 | * | |
609 | * If you set the real uid at all, or set the effective uid to a value not | |
610 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
611 | * | |
612 | * This makes it possible for a setuid program to completely drop its | |
613 | * privileges, which is often a useful assertion to make when you are doing | |
614 | * a security audit over a program. | |
615 | * | |
616 | * The general idea is that a program which uses just setreuid() will be | |
617 | * 100% compatible with BSD. A program which uses just setuid() will be | |
618 | * 100% compatible with POSIX with saved IDs. | |
619 | */ | |
ae1251ab | 620 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 621 | { |
d84f4f99 DH |
622 | const struct cred *old; |
623 | struct cred *new; | |
1da177e4 LT |
624 | int retval; |
625 | ||
d84f4f99 DH |
626 | new = prepare_creds(); |
627 | if (!new) | |
628 | return -ENOMEM; | |
629 | old = current_cred(); | |
630 | ||
d84f4f99 | 631 | retval = -EPERM; |
1da177e4 | 632 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
633 | new->uid = ruid; |
634 | if (old->uid != ruid && | |
635 | old->euid != ruid && | |
fc832ad3 | 636 | !nsown_capable(CAP_SETUID)) |
d84f4f99 | 637 | goto error; |
1da177e4 LT |
638 | } |
639 | ||
640 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
641 | new->euid = euid; |
642 | if (old->uid != euid && | |
643 | old->euid != euid && | |
644 | old->suid != euid && | |
fc832ad3 | 645 | !nsown_capable(CAP_SETUID)) |
d84f4f99 | 646 | goto error; |
1da177e4 LT |
647 | } |
648 | ||
54e99124 DG |
649 | if (new->uid != old->uid) { |
650 | retval = set_user(new); | |
651 | if (retval < 0) | |
652 | goto error; | |
653 | } | |
1da177e4 | 654 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
655 | (euid != (uid_t) -1 && euid != old->uid)) |
656 | new->suid = new->euid; | |
657 | new->fsuid = new->euid; | |
1da177e4 | 658 | |
d84f4f99 DH |
659 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
660 | if (retval < 0) | |
661 | goto error; | |
1da177e4 | 662 | |
d84f4f99 | 663 | return commit_creds(new); |
1da177e4 | 664 | |
d84f4f99 DH |
665 | error: |
666 | abort_creds(new); | |
667 | return retval; | |
668 | } | |
1da177e4 LT |
669 | |
670 | /* | |
671 | * setuid() is implemented like SysV with SAVED_IDS | |
672 | * | |
673 | * Note that SAVED_ID's is deficient in that a setuid root program | |
674 | * like sendmail, for example, cannot set its uid to be a normal | |
675 | * user and then switch back, because if you're root, setuid() sets | |
676 | * the saved uid too. If you don't like this, blame the bright people | |
677 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
678 | * will allow a root program to temporarily drop privileges and be able to | |
679 | * regain them by swapping the real and effective uid. | |
680 | */ | |
ae1251ab | 681 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 682 | { |
d84f4f99 DH |
683 | const struct cred *old; |
684 | struct cred *new; | |
1da177e4 LT |
685 | int retval; |
686 | ||
d84f4f99 DH |
687 | new = prepare_creds(); |
688 | if (!new) | |
689 | return -ENOMEM; | |
690 | old = current_cred(); | |
691 | ||
d84f4f99 | 692 | retval = -EPERM; |
fc832ad3 | 693 | if (nsown_capable(CAP_SETUID)) { |
d84f4f99 | 694 | new->suid = new->uid = uid; |
54e99124 DG |
695 | if (uid != old->uid) { |
696 | retval = set_user(new); | |
697 | if (retval < 0) | |
698 | goto error; | |
d84f4f99 DH |
699 | } |
700 | } else if (uid != old->uid && uid != new->suid) { | |
701 | goto error; | |
1da177e4 | 702 | } |
1da177e4 | 703 | |
d84f4f99 DH |
704 | new->fsuid = new->euid = uid; |
705 | ||
706 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
707 | if (retval < 0) | |
708 | goto error; | |
1da177e4 | 709 | |
d84f4f99 | 710 | return commit_creds(new); |
1da177e4 | 711 | |
d84f4f99 DH |
712 | error: |
713 | abort_creds(new); | |
714 | return retval; | |
1da177e4 LT |
715 | } |
716 | ||
717 | ||
718 | /* | |
719 | * This function implements a generic ability to update ruid, euid, | |
720 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
721 | */ | |
ae1251ab | 722 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 723 | { |
d84f4f99 DH |
724 | const struct cred *old; |
725 | struct cred *new; | |
1da177e4 LT |
726 | int retval; |
727 | ||
d84f4f99 DH |
728 | new = prepare_creds(); |
729 | if (!new) | |
730 | return -ENOMEM; | |
731 | ||
d84f4f99 | 732 | old = current_cred(); |
1da177e4 | 733 | |
d84f4f99 | 734 | retval = -EPERM; |
fc832ad3 | 735 | if (!nsown_capable(CAP_SETUID)) { |
d84f4f99 DH |
736 | if (ruid != (uid_t) -1 && ruid != old->uid && |
737 | ruid != old->euid && ruid != old->suid) | |
738 | goto error; | |
739 | if (euid != (uid_t) -1 && euid != old->uid && | |
740 | euid != old->euid && euid != old->suid) | |
741 | goto error; | |
742 | if (suid != (uid_t) -1 && suid != old->uid && | |
743 | suid != old->euid && suid != old->suid) | |
744 | goto error; | |
1da177e4 | 745 | } |
d84f4f99 | 746 | |
1da177e4 | 747 | if (ruid != (uid_t) -1) { |
d84f4f99 | 748 | new->uid = ruid; |
54e99124 DG |
749 | if (ruid != old->uid) { |
750 | retval = set_user(new); | |
751 | if (retval < 0) | |
752 | goto error; | |
753 | } | |
1da177e4 | 754 | } |
d84f4f99 DH |
755 | if (euid != (uid_t) -1) |
756 | new->euid = euid; | |
1da177e4 | 757 | if (suid != (uid_t) -1) |
d84f4f99 DH |
758 | new->suid = suid; |
759 | new->fsuid = new->euid; | |
1da177e4 | 760 | |
d84f4f99 DH |
761 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
762 | if (retval < 0) | |
763 | goto error; | |
1da177e4 | 764 | |
d84f4f99 | 765 | return commit_creds(new); |
1da177e4 | 766 | |
d84f4f99 DH |
767 | error: |
768 | abort_creds(new); | |
769 | return retval; | |
1da177e4 LT |
770 | } |
771 | ||
dbf040d9 | 772 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 773 | { |
86a264ab | 774 | const struct cred *cred = current_cred(); |
1da177e4 LT |
775 | int retval; |
776 | ||
86a264ab DH |
777 | if (!(retval = put_user(cred->uid, ruid)) && |
778 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 779 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
780 | |
781 | return retval; | |
782 | } | |
783 | ||
784 | /* | |
785 | * Same as above, but for rgid, egid, sgid. | |
786 | */ | |
ae1251ab | 787 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 788 | { |
d84f4f99 DH |
789 | const struct cred *old; |
790 | struct cred *new; | |
1da177e4 LT |
791 | int retval; |
792 | ||
d84f4f99 DH |
793 | new = prepare_creds(); |
794 | if (!new) | |
795 | return -ENOMEM; | |
796 | old = current_cred(); | |
797 | ||
d84f4f99 | 798 | retval = -EPERM; |
fc832ad3 | 799 | if (!nsown_capable(CAP_SETGID)) { |
d84f4f99 DH |
800 | if (rgid != (gid_t) -1 && rgid != old->gid && |
801 | rgid != old->egid && rgid != old->sgid) | |
802 | goto error; | |
803 | if (egid != (gid_t) -1 && egid != old->gid && | |
804 | egid != old->egid && egid != old->sgid) | |
805 | goto error; | |
806 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
807 | sgid != old->egid && sgid != old->sgid) | |
808 | goto error; | |
1da177e4 | 809 | } |
d84f4f99 | 810 | |
1da177e4 | 811 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
812 | new->gid = rgid; |
813 | if (egid != (gid_t) -1) | |
814 | new->egid = egid; | |
1da177e4 | 815 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
816 | new->sgid = sgid; |
817 | new->fsgid = new->egid; | |
1da177e4 | 818 | |
d84f4f99 DH |
819 | return commit_creds(new); |
820 | ||
821 | error: | |
822 | abort_creds(new); | |
823 | return retval; | |
1da177e4 LT |
824 | } |
825 | ||
dbf040d9 | 826 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 827 | { |
86a264ab | 828 | const struct cred *cred = current_cred(); |
1da177e4 LT |
829 | int retval; |
830 | ||
86a264ab DH |
831 | if (!(retval = put_user(cred->gid, rgid)) && |
832 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 833 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
834 | |
835 | return retval; | |
836 | } | |
837 | ||
838 | ||
839 | /* | |
840 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
841 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
842 | * whatever uid it wants to). It normally shadows "euid", except when | |
843 | * explicitly set by setfsuid() or for access.. | |
844 | */ | |
ae1251ab | 845 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 846 | { |
d84f4f99 DH |
847 | const struct cred *old; |
848 | struct cred *new; | |
849 | uid_t old_fsuid; | |
1da177e4 | 850 | |
d84f4f99 DH |
851 | new = prepare_creds(); |
852 | if (!new) | |
853 | return current_fsuid(); | |
854 | old = current_cred(); | |
855 | old_fsuid = old->fsuid; | |
1da177e4 | 856 | |
d84f4f99 DH |
857 | if (uid == old->uid || uid == old->euid || |
858 | uid == old->suid || uid == old->fsuid || | |
fc832ad3 | 859 | nsown_capable(CAP_SETUID)) { |
756184b7 | 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 | abort_creds(new); |
868 | return old_fsuid; | |
1da177e4 | 869 | |
d84f4f99 DH |
870 | change_okay: |
871 | commit_creds(new); | |
1da177e4 LT |
872 | return old_fsuid; |
873 | } | |
874 | ||
875 | /* | |
f42df9e6 | 876 | * Samma på svenska.. |
1da177e4 | 877 | */ |
ae1251ab | 878 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 879 | { |
d84f4f99 DH |
880 | const struct cred *old; |
881 | struct cred *new; | |
882 | gid_t old_fsgid; | |
883 | ||
884 | new = prepare_creds(); | |
885 | if (!new) | |
886 | return current_fsgid(); | |
887 | old = current_cred(); | |
888 | old_fsgid = old->fsgid; | |
1da177e4 | 889 | |
d84f4f99 DH |
890 | if (gid == old->gid || gid == old->egid || |
891 | gid == old->sgid || gid == old->fsgid || | |
fc832ad3 | 892 | nsown_capable(CAP_SETGID)) { |
756184b7 | 893 | if (gid != old_fsgid) { |
d84f4f99 DH |
894 | new->fsgid = gid; |
895 | goto change_okay; | |
1da177e4 | 896 | } |
1da177e4 | 897 | } |
d84f4f99 | 898 | |
d84f4f99 DH |
899 | abort_creds(new); |
900 | return old_fsgid; | |
901 | ||
902 | change_okay: | |
903 | commit_creds(new); | |
1da177e4 LT |
904 | return old_fsgid; |
905 | } | |
906 | ||
f06febc9 FM |
907 | void do_sys_times(struct tms *tms) |
908 | { | |
0cf55e1e | 909 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 910 | |
2b5fe6de | 911 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 912 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
913 | cutime = current->signal->cutime; |
914 | cstime = current->signal->cstime; | |
915 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
916 | tms->tms_utime = cputime_to_clock_t(tgutime); |
917 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
918 | tms->tms_cutime = cputime_to_clock_t(cutime); |
919 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
920 | } | |
921 | ||
58fd3aa2 | 922 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 923 | { |
1da177e4 LT |
924 | if (tbuf) { |
925 | struct tms tmp; | |
f06febc9 FM |
926 | |
927 | do_sys_times(&tmp); | |
1da177e4 LT |
928 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
929 | return -EFAULT; | |
930 | } | |
e3d5a27d | 931 | force_successful_syscall_return(); |
1da177e4 LT |
932 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
933 | } | |
934 | ||
935 | /* | |
936 | * This needs some heavy checking ... | |
937 | * I just haven't the stomach for it. I also don't fully | |
938 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
939 | * | |
940 | * OK, I think I have the protection semantics right.... this is really | |
941 | * only important on a multi-user system anyway, to make sure one user | |
942 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
943 | * | |
944 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
945 | * LBT 04.03.94 | |
946 | */ | |
b290ebe2 | 947 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
948 | { |
949 | struct task_struct *p; | |
ee0acf90 | 950 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
951 | struct pid *pgrp; |
952 | int err; | |
1da177e4 LT |
953 | |
954 | if (!pid) | |
b488893a | 955 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
956 | if (!pgid) |
957 | pgid = pid; | |
958 | if (pgid < 0) | |
959 | return -EINVAL; | |
950eaaca | 960 | rcu_read_lock(); |
1da177e4 LT |
961 | |
962 | /* From this point forward we keep holding onto the tasklist lock | |
963 | * so that our parent does not change from under us. -DaveM | |
964 | */ | |
965 | write_lock_irq(&tasklist_lock); | |
966 | ||
967 | err = -ESRCH; | |
4e021306 | 968 | p = find_task_by_vpid(pid); |
1da177e4 LT |
969 | if (!p) |
970 | goto out; | |
971 | ||
972 | err = -EINVAL; | |
973 | if (!thread_group_leader(p)) | |
974 | goto out; | |
975 | ||
4e021306 | 976 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 977 | err = -EPERM; |
41487c65 | 978 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
979 | goto out; |
980 | err = -EACCES; | |
981 | if (p->did_exec) | |
982 | goto out; | |
983 | } else { | |
984 | err = -ESRCH; | |
ee0acf90 | 985 | if (p != group_leader) |
1da177e4 LT |
986 | goto out; |
987 | } | |
988 | ||
989 | err = -EPERM; | |
990 | if (p->signal->leader) | |
991 | goto out; | |
992 | ||
4e021306 | 993 | pgrp = task_pid(p); |
1da177e4 | 994 | if (pgid != pid) { |
b488893a | 995 | struct task_struct *g; |
1da177e4 | 996 | |
4e021306 ON |
997 | pgrp = find_vpid(pgid); |
998 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 999 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1000 | goto out; |
1da177e4 LT |
1001 | } |
1002 | ||
1da177e4 LT |
1003 | err = security_task_setpgid(p, pgid); |
1004 | if (err) | |
1005 | goto out; | |
1006 | ||
1b0f7ffd | 1007 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1008 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1009 | |
1010 | err = 0; | |
1011 | out: | |
1012 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1013 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 1014 | rcu_read_unlock(); |
1da177e4 LT |
1015 | return err; |
1016 | } | |
1017 | ||
dbf040d9 | 1018 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1019 | { |
12a3de0a ON |
1020 | struct task_struct *p; |
1021 | struct pid *grp; | |
1022 | int retval; | |
1023 | ||
1024 | rcu_read_lock(); | |
756184b7 | 1025 | if (!pid) |
12a3de0a | 1026 | grp = task_pgrp(current); |
756184b7 | 1027 | else { |
1da177e4 | 1028 | retval = -ESRCH; |
12a3de0a ON |
1029 | p = find_task_by_vpid(pid); |
1030 | if (!p) | |
1031 | goto out; | |
1032 | grp = task_pgrp(p); | |
1033 | if (!grp) | |
1034 | goto out; | |
1035 | ||
1036 | retval = security_task_getpgid(p); | |
1037 | if (retval) | |
1038 | goto out; | |
1da177e4 | 1039 | } |
12a3de0a ON |
1040 | retval = pid_vnr(grp); |
1041 | out: | |
1042 | rcu_read_unlock(); | |
1043 | return retval; | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1047 | ||
dbf040d9 | 1048 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1049 | { |
12a3de0a | 1050 | return sys_getpgid(0); |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | #endif | |
1054 | ||
dbf040d9 | 1055 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1056 | { |
1dd768c0 ON |
1057 | struct task_struct *p; |
1058 | struct pid *sid; | |
1059 | int retval; | |
1060 | ||
1061 | rcu_read_lock(); | |
756184b7 | 1062 | if (!pid) |
1dd768c0 | 1063 | sid = task_session(current); |
756184b7 | 1064 | else { |
1da177e4 | 1065 | retval = -ESRCH; |
1dd768c0 ON |
1066 | p = find_task_by_vpid(pid); |
1067 | if (!p) | |
1068 | goto out; | |
1069 | sid = task_session(p); | |
1070 | if (!sid) | |
1071 | goto out; | |
1072 | ||
1073 | retval = security_task_getsid(p); | |
1074 | if (retval) | |
1075 | goto out; | |
1da177e4 | 1076 | } |
1dd768c0 ON |
1077 | retval = pid_vnr(sid); |
1078 | out: | |
1079 | rcu_read_unlock(); | |
1080 | return retval; | |
1da177e4 LT |
1081 | } |
1082 | ||
b290ebe2 | 1083 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1084 | { |
e19f247a | 1085 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1086 | struct pid *sid = task_pid(group_leader); |
1087 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1088 | int err = -EPERM; |
1089 | ||
1da177e4 | 1090 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1091 | /* Fail if I am already a session leader */ |
1092 | if (group_leader->signal->leader) | |
1093 | goto out; | |
1094 | ||
430c6231 ON |
1095 | /* Fail if a process group id already exists that equals the |
1096 | * proposed session id. | |
390e2ff0 | 1097 | */ |
6806aac6 | 1098 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1099 | goto out; |
1100 | ||
e19f247a | 1101 | group_leader->signal->leader = 1; |
8520d7c7 | 1102 | __set_special_pids(sid); |
24ec839c | 1103 | |
9c9f4ded | 1104 | proc_clear_tty(group_leader); |
24ec839c | 1105 | |
e4cc0a9c | 1106 | err = session; |
1da177e4 LT |
1107 | out: |
1108 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1109 | if (err > 0) { |
0d0df599 | 1110 | proc_sid_connector(group_leader); |
5091faa4 MG |
1111 | sched_autogroup_create_attach(group_leader); |
1112 | } | |
1da177e4 LT |
1113 | return err; |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | DECLARE_RWSEM(uts_sem); |
1117 | ||
e28cbf22 CH |
1118 | #ifdef COMPAT_UTS_MACHINE |
1119 | #define override_architecture(name) \ | |
46da2766 | 1120 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1121 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1122 | sizeof(COMPAT_UTS_MACHINE))) | |
1123 | #else | |
1124 | #define override_architecture(name) 0 | |
1125 | #endif | |
1126 | ||
e48fbb69 | 1127 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1128 | { |
1129 | int errno = 0; | |
1130 | ||
1131 | down_read(&uts_sem); | |
e9ff3990 | 1132 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1133 | errno = -EFAULT; |
1134 | up_read(&uts_sem); | |
e28cbf22 CH |
1135 | |
1136 | if (!errno && override_architecture(name)) | |
1137 | errno = -EFAULT; | |
1da177e4 LT |
1138 | return errno; |
1139 | } | |
1140 | ||
5cacdb4a CH |
1141 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1142 | /* | |
1143 | * Old cruft | |
1144 | */ | |
1145 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1146 | { | |
1147 | int error = 0; | |
1148 | ||
1149 | if (!name) | |
1150 | return -EFAULT; | |
1151 | ||
1152 | down_read(&uts_sem); | |
1153 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1154 | error = -EFAULT; | |
1155 | up_read(&uts_sem); | |
1156 | ||
1157 | if (!error && override_architecture(name)) | |
1158 | error = -EFAULT; | |
1159 | return error; | |
1160 | } | |
1161 | ||
1162 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1163 | { | |
1164 | int error; | |
1165 | ||
1166 | if (!name) | |
1167 | return -EFAULT; | |
1168 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1169 | return -EFAULT; | |
1170 | ||
1171 | down_read(&uts_sem); | |
1172 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1173 | __OLD_UTS_LEN); | |
1174 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1175 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1176 | __OLD_UTS_LEN); | |
1177 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1178 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1179 | __OLD_UTS_LEN); | |
1180 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1181 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1182 | __OLD_UTS_LEN); | |
1183 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1184 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1185 | __OLD_UTS_LEN); | |
1186 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1187 | up_read(&uts_sem); | |
1188 | ||
1189 | if (!error && override_architecture(name)) | |
1190 | error = -EFAULT; | |
1191 | return error ? -EFAULT : 0; | |
1192 | } | |
1193 | #endif | |
1194 | ||
5a8a82b1 | 1195 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1196 | { |
1197 | int errno; | |
1198 | char tmp[__NEW_UTS_LEN]; | |
1199 | ||
bb96a6f5 | 1200 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1201 | return -EPERM; |
fc832ad3 | 1202 | |
1da177e4 LT |
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 | ||
fc832ad3 | 1250 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
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 | 1269 | { |
b9518345 JS |
1270 | struct rlimit value; |
1271 | int ret; | |
1272 | ||
1273 | ret = do_prlimit(current, resource, NULL, &value); | |
1274 | if (!ret) | |
1275 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1276 | ||
1277 | return ret; | |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1281 | ||
1282 | /* | |
1283 | * Back compatibility for getrlimit. Needed for some apps. | |
1284 | */ | |
1285 | ||
e48fbb69 HC |
1286 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1287 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1288 | { |
1289 | struct rlimit x; | |
1290 | if (resource >= RLIM_NLIMITS) | |
1291 | return -EINVAL; | |
1292 | ||
1293 | task_lock(current->group_leader); | |
1294 | x = current->signal->rlim[resource]; | |
1295 | task_unlock(current->group_leader); | |
756184b7 | 1296 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1297 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1298 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1299 | x.rlim_max = 0x7FFFFFFF; |
1300 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1301 | } | |
1302 | ||
1303 | #endif | |
1304 | ||
c022a0ac JS |
1305 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1306 | { | |
1307 | #if BITS_PER_LONG < 64 | |
1308 | return rlim64 >= ULONG_MAX; | |
1309 | #else | |
1310 | return rlim64 == RLIM64_INFINITY; | |
1311 | #endif | |
1312 | } | |
1313 | ||
1314 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1315 | { | |
1316 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1317 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1318 | else | |
1319 | rlim64->rlim_cur = rlim->rlim_cur; | |
1320 | if (rlim->rlim_max == RLIM_INFINITY) | |
1321 | rlim64->rlim_max = RLIM64_INFINITY; | |
1322 | else | |
1323 | rlim64->rlim_max = rlim->rlim_max; | |
1324 | } | |
1325 | ||
1326 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1327 | { | |
1328 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1329 | rlim->rlim_cur = RLIM_INFINITY; | |
1330 | else | |
1331 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1332 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1333 | rlim->rlim_max = RLIM_INFINITY; | |
1334 | else | |
1335 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1336 | } | |
1337 | ||
1c1e618d | 1338 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1339 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1340 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1341 | { |
5b41535a | 1342 | struct rlimit *rlim; |
86f162f4 | 1343 | int retval = 0; |
1da177e4 LT |
1344 | |
1345 | if (resource >= RLIM_NLIMITS) | |
1346 | return -EINVAL; | |
5b41535a JS |
1347 | if (new_rlim) { |
1348 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1349 | return -EINVAL; | |
1350 | if (resource == RLIMIT_NOFILE && | |
1351 | new_rlim->rlim_max > sysctl_nr_open) | |
1352 | return -EPERM; | |
1353 | } | |
1da177e4 | 1354 | |
1c1e618d JS |
1355 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1356 | read_lock(&tasklist_lock); | |
1357 | if (!tsk->sighand) { | |
1358 | retval = -ESRCH; | |
1359 | goto out; | |
1360 | } | |
1361 | ||
5b41535a | 1362 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1363 | task_lock(tsk->group_leader); |
5b41535a | 1364 | if (new_rlim) { |
fc832ad3 SH |
1365 | /* Keep the capable check against init_user_ns until |
1366 | cgroups can contain all limits */ | |
5b41535a JS |
1367 | if (new_rlim->rlim_max > rlim->rlim_max && |
1368 | !capable(CAP_SYS_RESOURCE)) | |
1369 | retval = -EPERM; | |
1370 | if (!retval) | |
1371 | retval = security_task_setrlimit(tsk->group_leader, | |
1372 | resource, new_rlim); | |
1373 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1374 | /* | |
1375 | * The caller is asking for an immediate RLIMIT_CPU | |
1376 | * expiry. But we use the zero value to mean "it was | |
1377 | * never set". So let's cheat and make it one second | |
1378 | * instead | |
1379 | */ | |
1380 | new_rlim->rlim_cur = 1; | |
1381 | } | |
1382 | } | |
1383 | if (!retval) { | |
1384 | if (old_rlim) | |
1385 | *old_rlim = *rlim; | |
1386 | if (new_rlim) | |
1387 | *rlim = *new_rlim; | |
9926e4c7 | 1388 | } |
7855c35d | 1389 | task_unlock(tsk->group_leader); |
1da177e4 | 1390 | |
d3561f78 AM |
1391 | /* |
1392 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1393 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1394 | * very long-standing error, and fixing it now risks breakage of | |
1395 | * applications, so we live with it | |
1396 | */ | |
5b41535a JS |
1397 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
1398 | new_rlim->rlim_cur != RLIM_INFINITY) | |
1399 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); | |
ec9e16ba | 1400 | out: |
1c1e618d | 1401 | read_unlock(&tasklist_lock); |
2fb9d268 | 1402 | return retval; |
1da177e4 LT |
1403 | } |
1404 | ||
c022a0ac JS |
1405 | /* rcu lock must be held */ |
1406 | static int check_prlimit_permission(struct task_struct *task) | |
1407 | { | |
1408 | const struct cred *cred = current_cred(), *tcred; | |
1409 | ||
fc832ad3 SH |
1410 | if (current == task) |
1411 | return 0; | |
c022a0ac | 1412 | |
fc832ad3 SH |
1413 | tcred = __task_cred(task); |
1414 | if (cred->user->user_ns == tcred->user->user_ns && | |
1415 | (cred->uid == tcred->euid && | |
1416 | cred->uid == tcred->suid && | |
1417 | cred->uid == tcred->uid && | |
1418 | cred->gid == tcred->egid && | |
1419 | cred->gid == tcred->sgid && | |
1420 | cred->gid == tcred->gid)) | |
1421 | return 0; | |
1422 | if (ns_capable(tcred->user->user_ns, CAP_SYS_RESOURCE)) | |
1423 | return 0; | |
1424 | ||
1425 | return -EPERM; | |
c022a0ac JS |
1426 | } |
1427 | ||
1428 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1429 | const struct rlimit64 __user *, new_rlim, | |
1430 | struct rlimit64 __user *, old_rlim) | |
1431 | { | |
1432 | struct rlimit64 old64, new64; | |
1433 | struct rlimit old, new; | |
1434 | struct task_struct *tsk; | |
1435 | int ret; | |
1436 | ||
1437 | if (new_rlim) { | |
1438 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1439 | return -EFAULT; | |
1440 | rlim64_to_rlim(&new64, &new); | |
1441 | } | |
1442 | ||
1443 | rcu_read_lock(); | |
1444 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1445 | if (!tsk) { | |
1446 | rcu_read_unlock(); | |
1447 | return -ESRCH; | |
1448 | } | |
1449 | ret = check_prlimit_permission(tsk); | |
1450 | if (ret) { | |
1451 | rcu_read_unlock(); | |
1452 | return ret; | |
1453 | } | |
1454 | get_task_struct(tsk); | |
1455 | rcu_read_unlock(); | |
1456 | ||
1457 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1458 | old_rlim ? &old : NULL); | |
1459 | ||
1460 | if (!ret && old_rlim) { | |
1461 | rlim_to_rlim64(&old, &old64); | |
1462 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1463 | ret = -EFAULT; | |
1464 | } | |
1465 | ||
1466 | put_task_struct(tsk); | |
1467 | return ret; | |
1468 | } | |
1469 | ||
7855c35d JS |
1470 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1471 | { | |
1472 | struct rlimit new_rlim; | |
1473 | ||
1474 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1475 | return -EFAULT; | |
5b41535a | 1476 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1477 | } |
1478 | ||
1da177e4 LT |
1479 | /* |
1480 | * It would make sense to put struct rusage in the task_struct, | |
1481 | * except that would make the task_struct be *really big*. After | |
1482 | * task_struct gets moved into malloc'ed memory, it would | |
1483 | * make sense to do this. It will make moving the rest of the information | |
1484 | * a lot simpler! (Which we're not doing right now because we're not | |
1485 | * measuring them yet). | |
1486 | * | |
1da177e4 LT |
1487 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1488 | * races with threads incrementing their own counters. But since word | |
1489 | * reads are atomic, we either get new values or old values and we don't | |
1490 | * care which for the sums. We always take the siglock to protect reading | |
1491 | * the c* fields from p->signal from races with exit.c updating those | |
1492 | * fields when reaping, so a sample either gets all the additions of a | |
1493 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1494 | * |
de047c1b RT |
1495 | * Locking: |
1496 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1497 | * for the cases current multithreaded, non-current single threaded | |
1498 | * non-current multithreaded. Thread traversal is now safe with | |
1499 | * the siglock held. | |
1500 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1501 | * single threaded, as no one else can take our signal_struct away, no one | |
1502 | * else can reap the children to update signal->c* counters, and no one else | |
1503 | * can race with the signal-> fields. If we do not take any lock, the | |
1504 | * signal-> fields could be read out of order while another thread was just | |
1505 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1506 | * On the writer side, write memory barrier is implied in __exit_signal | |
1507 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1508 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1509 | * |
1da177e4 LT |
1510 | */ |
1511 | ||
f06febc9 | 1512 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1513 | { |
679c9cd4 SK |
1514 | r->ru_nvcsw += t->nvcsw; |
1515 | r->ru_nivcsw += t->nivcsw; | |
1516 | r->ru_minflt += t->min_flt; | |
1517 | r->ru_majflt += t->maj_flt; | |
1518 | r->ru_inblock += task_io_get_inblock(t); | |
1519 | r->ru_oublock += task_io_get_oublock(t); | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1523 | { | |
1524 | struct task_struct *t; | |
1525 | unsigned long flags; | |
0cf55e1e | 1526 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1527 | unsigned long maxrss = 0; |
1da177e4 LT |
1528 | |
1529 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1530 | utime = stime = cputime_zero; |
1da177e4 | 1531 | |
679c9cd4 | 1532 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1533 | task_times(current, &utime, &stime); |
f06febc9 | 1534 | accumulate_thread_rusage(p, r); |
1f10206c | 1535 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1536 | goto out; |
1537 | } | |
1538 | ||
d6cf723a | 1539 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1540 | return; |
0f59cc4a | 1541 | |
1da177e4 | 1542 | switch (who) { |
0f59cc4a | 1543 | case RUSAGE_BOTH: |
1da177e4 | 1544 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1545 | utime = p->signal->cutime; |
1546 | stime = p->signal->cstime; | |
1547 | r->ru_nvcsw = p->signal->cnvcsw; | |
1548 | r->ru_nivcsw = p->signal->cnivcsw; | |
1549 | r->ru_minflt = p->signal->cmin_flt; | |
1550 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1551 | r->ru_inblock = p->signal->cinblock; |
1552 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1553 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1554 | |
1555 | if (who == RUSAGE_CHILDREN) | |
1556 | break; | |
1557 | ||
1da177e4 | 1558 | case RUSAGE_SELF: |
0cf55e1e HS |
1559 | thread_group_times(p, &tgutime, &tgstime); |
1560 | utime = cputime_add(utime, tgutime); | |
1561 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1562 | r->ru_nvcsw += p->signal->nvcsw; |
1563 | r->ru_nivcsw += p->signal->nivcsw; | |
1564 | r->ru_minflt += p->signal->min_flt; | |
1565 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1566 | r->ru_inblock += p->signal->inblock; |
1567 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1568 | if (maxrss < p->signal->maxrss) |
1569 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1570 | t = p; |
1571 | do { | |
f06febc9 | 1572 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1573 | t = next_thread(t); |
1574 | } while (t != p); | |
1da177e4 | 1575 | break; |
0f59cc4a | 1576 | |
1da177e4 LT |
1577 | default: |
1578 | BUG(); | |
1579 | } | |
de047c1b | 1580 | unlock_task_sighand(p, &flags); |
de047c1b | 1581 | |
679c9cd4 | 1582 | out: |
0f59cc4a ON |
1583 | cputime_to_timeval(utime, &r->ru_utime); |
1584 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1585 | |
1586 | if (who != RUSAGE_CHILDREN) { | |
1587 | struct mm_struct *mm = get_task_mm(p); | |
1588 | if (mm) { | |
1589 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1590 | mmput(mm); | |
1591 | } | |
1592 | } | |
1593 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1597 | { | |
1598 | struct rusage r; | |
1da177e4 | 1599 | k_getrusage(p, who, &r); |
1da177e4 LT |
1600 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1601 | } | |
1602 | ||
e48fbb69 | 1603 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1604 | { |
679c9cd4 SK |
1605 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1606 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1607 | return -EINVAL; |
1608 | return getrusage(current, who, ru); | |
1609 | } | |
1610 | ||
e48fbb69 | 1611 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1612 | { |
1613 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1614 | return mask; | |
1615 | } | |
3b7391de | 1616 | |
c4ea37c2 HC |
1617 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1618 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1619 | { |
b6dff3ec DH |
1620 | struct task_struct *me = current; |
1621 | unsigned char comm[sizeof(me->comm)]; | |
1622 | long error; | |
1da177e4 | 1623 | |
d84f4f99 DH |
1624 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1625 | if (error != -ENOSYS) | |
1da177e4 LT |
1626 | return error; |
1627 | ||
d84f4f99 | 1628 | error = 0; |
1da177e4 LT |
1629 | switch (option) { |
1630 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1631 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1632 | error = -EINVAL; |
1633 | break; | |
1634 | } | |
b6dff3ec DH |
1635 | me->pdeath_signal = arg2; |
1636 | error = 0; | |
1da177e4 LT |
1637 | break; |
1638 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1639 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1640 | break; |
1641 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1642 | error = get_dumpable(me->mm); |
1da177e4 LT |
1643 | break; |
1644 | case PR_SET_DUMPABLE: | |
abf75a50 | 1645 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1646 | error = -EINVAL; |
1647 | break; | |
1648 | } | |
b6dff3ec DH |
1649 | set_dumpable(me->mm, arg2); |
1650 | error = 0; | |
1da177e4 LT |
1651 | break; |
1652 | ||
1653 | case PR_SET_UNALIGN: | |
b6dff3ec | 1654 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1655 | break; |
1656 | case PR_GET_UNALIGN: | |
b6dff3ec | 1657 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1658 | break; |
1659 | case PR_SET_FPEMU: | |
b6dff3ec | 1660 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1661 | break; |
1662 | case PR_GET_FPEMU: | |
b6dff3ec | 1663 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1664 | break; |
1665 | case PR_SET_FPEXC: | |
b6dff3ec | 1666 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1667 | break; |
1668 | case PR_GET_FPEXC: | |
b6dff3ec | 1669 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1670 | break; |
1671 | case PR_GET_TIMING: | |
1672 | error = PR_TIMING_STATISTICAL; | |
1673 | break; | |
1674 | case PR_SET_TIMING: | |
7b26655f | 1675 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1676 | error = -EINVAL; |
b6dff3ec DH |
1677 | else |
1678 | error = 0; | |
1da177e4 LT |
1679 | break; |
1680 | ||
b6dff3ec DH |
1681 | case PR_SET_NAME: |
1682 | comm[sizeof(me->comm)-1] = 0; | |
1683 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1684 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1685 | return -EFAULT; |
b6dff3ec | 1686 | set_task_comm(me, comm); |
1da177e4 | 1687 | return 0; |
b6dff3ec DH |
1688 | case PR_GET_NAME: |
1689 | get_task_comm(comm, me); | |
1690 | if (copy_to_user((char __user *)arg2, comm, | |
1691 | sizeof(comm))) | |
1da177e4 LT |
1692 | return -EFAULT; |
1693 | return 0; | |
651d765d | 1694 | case PR_GET_ENDIAN: |
b6dff3ec | 1695 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1696 | break; |
1697 | case PR_SET_ENDIAN: | |
b6dff3ec | 1698 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1699 | break; |
1700 | ||
1d9d02fe AA |
1701 | case PR_GET_SECCOMP: |
1702 | error = prctl_get_seccomp(); | |
1703 | break; | |
1704 | case PR_SET_SECCOMP: | |
1705 | error = prctl_set_seccomp(arg2); | |
1706 | break; | |
8fb402bc EB |
1707 | case PR_GET_TSC: |
1708 | error = GET_TSC_CTL(arg2); | |
1709 | break; | |
1710 | case PR_SET_TSC: | |
1711 | error = SET_TSC_CTL(arg2); | |
1712 | break; | |
cdd6c482 IM |
1713 | case PR_TASK_PERF_EVENTS_DISABLE: |
1714 | error = perf_event_task_disable(); | |
1d1c7ddb | 1715 | break; |
cdd6c482 IM |
1716 | case PR_TASK_PERF_EVENTS_ENABLE: |
1717 | error = perf_event_task_enable(); | |
1d1c7ddb | 1718 | break; |
6976675d AV |
1719 | case PR_GET_TIMERSLACK: |
1720 | error = current->timer_slack_ns; | |
1721 | break; | |
1722 | case PR_SET_TIMERSLACK: | |
1723 | if (arg2 <= 0) | |
1724 | current->timer_slack_ns = | |
1725 | current->default_timer_slack_ns; | |
1726 | else | |
1727 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1728 | error = 0; |
6976675d | 1729 | break; |
4db96cf0 AK |
1730 | case PR_MCE_KILL: |
1731 | if (arg4 | arg5) | |
1732 | return -EINVAL; | |
1733 | switch (arg2) { | |
1087e9b4 | 1734 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1735 | if (arg3 != 0) |
1736 | return -EINVAL; | |
1737 | current->flags &= ~PF_MCE_PROCESS; | |
1738 | break; | |
1087e9b4 | 1739 | case PR_MCE_KILL_SET: |
4db96cf0 | 1740 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1741 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1742 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1743 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1744 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1745 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1746 | current->flags &= | |
1747 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1748 | else | |
1749 | return -EINVAL; | |
4db96cf0 AK |
1750 | break; |
1751 | default: | |
1752 | return -EINVAL; | |
1753 | } | |
1754 | error = 0; | |
1755 | break; | |
1087e9b4 AK |
1756 | case PR_MCE_KILL_GET: |
1757 | if (arg2 | arg3 | arg4 | arg5) | |
1758 | return -EINVAL; | |
1759 | if (current->flags & PF_MCE_PROCESS) | |
1760 | error = (current->flags & PF_MCE_EARLY) ? | |
1761 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1762 | else | |
1763 | error = PR_MCE_KILL_DEFAULT; | |
1764 | break; | |
1da177e4 LT |
1765 | default: |
1766 | error = -EINVAL; | |
1767 | break; | |
1768 | } | |
1769 | return error; | |
1770 | } | |
3cfc348b | 1771 | |
836f92ad HC |
1772 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1773 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1774 | { |
1775 | int err = 0; | |
1776 | int cpu = raw_smp_processor_id(); | |
1777 | if (cpup) | |
1778 | err |= put_user(cpu, cpup); | |
1779 | if (nodep) | |
1780 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1781 | return err ? -EFAULT : 0; |
1782 | } | |
10a0a8d4 JF |
1783 | |
1784 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1785 | ||
a06a4dc3 | 1786 | static void argv_cleanup(struct subprocess_info *info) |
10a0a8d4 | 1787 | { |
a06a4dc3 | 1788 | argv_free(info->argv); |
10a0a8d4 JF |
1789 | } |
1790 | ||
1791 | /** | |
1792 | * orderly_poweroff - Trigger an orderly system poweroff | |
1793 | * @force: force poweroff if command execution fails | |
1794 | * | |
1795 | * This may be called from any context to trigger a system shutdown. | |
1796 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1797 | */ | |
1798 | int orderly_poweroff(bool force) | |
1799 | { | |
1800 | int argc; | |
1801 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1802 | static char *envp[] = { | |
1803 | "HOME=/", | |
1804 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1805 | NULL | |
1806 | }; | |
1807 | int ret = -ENOMEM; | |
1808 | struct subprocess_info *info; | |
1809 | ||
1810 | if (argv == NULL) { | |
1811 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1812 | __func__, poweroff_cmd); | |
1813 | goto out; | |
1814 | } | |
1815 | ||
ac331d15 | 1816 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1817 | if (info == NULL) { |
1818 | argv_free(argv); | |
1819 | goto out; | |
1820 | } | |
1821 | ||
a06a4dc3 | 1822 | call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
10a0a8d4 | 1823 | |
86313c48 | 1824 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1825 | |
1826 | out: | |
1827 | if (ret && force) { | |
1828 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1829 | "forcing the issue\n"); | |
1830 | ||
1831 | /* I guess this should try to kick off some daemon to | |
1832 | sync and poweroff asap. Or not even bother syncing | |
1833 | if we're doing an emergency shutdown? */ | |
1834 | emergency_sync(); | |
1835 | kernel_power_off(); | |
1836 | } | |
1837 | ||
1838 | return ret; | |
1839 | } | |
1840 | EXPORT_SYMBOL_GPL(orderly_poweroff); |