Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
1da177e4 LT |
11 | #include <linux/notifier.h> |
12 | #include <linux/reboot.h> | |
13 | #include <linux/prctl.h> | |
1da177e4 LT |
14 | #include <linux/highuid.h> |
15 | #include <linux/fs.h> | |
cdd6c482 | 16 | #include <linux/perf_event.h> |
3e88c553 | 17 | #include <linux/resource.h> |
dc009d92 EB |
18 | #include <linux/kernel.h> |
19 | #include <linux/kexec.h> | |
1da177e4 | 20 | #include <linux/workqueue.h> |
c59ede7b | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/device.h> |
23 | #include <linux/key.h> | |
24 | #include <linux/times.h> | |
25 | #include <linux/posix-timers.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/dcookies.h> | |
28 | #include <linux/suspend.h> | |
29 | #include <linux/tty.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
9f46080c | 31 | #include <linux/cn_proc.h> |
3cfc348b | 32 | #include <linux/getcpu.h> |
6eaeeaba | 33 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 34 | #include <linux/seccomp.h> |
4047727e | 35 | #include <linux/cpu.h> |
e28cbf22 | 36 | #include <linux/personality.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
5ad4e53b | 38 | #include <linux/fs_struct.h> |
5a0e3ad6 | 39 | #include <linux/gfp.h> |
1da177e4 LT |
40 | |
41 | #include <linux/compat.h> | |
42 | #include <linux/syscalls.h> | |
00d7c05a | 43 | #include <linux/kprobes.h> |
acce292c | 44 | #include <linux/user_namespace.h> |
1da177e4 | 45 | |
04c6862c SA |
46 | #include <linux/kmsg_dump.h> |
47 | ||
1da177e4 LT |
48 | #include <asm/uaccess.h> |
49 | #include <asm/io.h> | |
50 | #include <asm/unistd.h> | |
51 | ||
52 | #ifndef SET_UNALIGN_CTL | |
53 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
54 | #endif | |
55 | #ifndef GET_UNALIGN_CTL | |
56 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
57 | #endif | |
58 | #ifndef SET_FPEMU_CTL | |
59 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
60 | #endif | |
61 | #ifndef GET_FPEMU_CTL | |
62 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
63 | #endif | |
64 | #ifndef SET_FPEXC_CTL | |
65 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
66 | #endif | |
67 | #ifndef GET_FPEXC_CTL | |
68 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
69 | #endif | |
651d765d AB |
70 | #ifndef GET_ENDIAN |
71 | # define GET_ENDIAN(a,b) (-EINVAL) | |
72 | #endif | |
73 | #ifndef SET_ENDIAN | |
74 | # define SET_ENDIAN(a,b) (-EINVAL) | |
75 | #endif | |
8fb402bc EB |
76 | #ifndef GET_TSC_CTL |
77 | # define GET_TSC_CTL(a) (-EINVAL) | |
78 | #endif | |
79 | #ifndef SET_TSC_CTL | |
80 | # define SET_TSC_CTL(a) (-EINVAL) | |
81 | #endif | |
1da177e4 LT |
82 | |
83 | /* | |
84 | * this is where the system-wide overflow UID and GID are defined, for | |
85 | * architectures that now have 32-bit UID/GID but didn't in the past | |
86 | */ | |
87 | ||
88 | int overflowuid = DEFAULT_OVERFLOWUID; | |
89 | int overflowgid = DEFAULT_OVERFLOWGID; | |
90 | ||
91 | #ifdef CONFIG_UID16 | |
92 | EXPORT_SYMBOL(overflowuid); | |
93 | EXPORT_SYMBOL(overflowgid); | |
94 | #endif | |
95 | ||
96 | /* | |
97 | * the same as above, but for filesystems which can only store a 16-bit | |
98 | * UID and GID. as such, this is needed on all architectures | |
99 | */ | |
100 | ||
101 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
102 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
103 | ||
104 | EXPORT_SYMBOL(fs_overflowuid); | |
105 | EXPORT_SYMBOL(fs_overflowgid); | |
106 | ||
107 | /* | |
108 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
109 | */ | |
110 | ||
111 | int C_A_D = 1; | |
9ec52099 CLG |
112 | struct pid *cad_pid; |
113 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 114 | |
bd804eba RW |
115 | /* |
116 | * If set, this is used for preparing the system to power off. | |
117 | */ | |
118 | ||
119 | void (*pm_power_off_prepare)(void); | |
bd804eba | 120 | |
c69e8d9c DH |
121 | /* |
122 | * set the priority of a task | |
123 | * - the caller must hold the RCU read lock | |
124 | */ | |
1da177e4 LT |
125 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
126 | { | |
c69e8d9c | 127 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
1da177e4 LT |
128 | int no_nice; |
129 | ||
c69e8d9c DH |
130 | if (pcred->uid != cred->euid && |
131 | pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
132 | error = -EPERM; |
133 | goto out; | |
134 | } | |
e43379f1 | 135 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
136 | error = -EACCES; |
137 | goto out; | |
138 | } | |
139 | no_nice = security_task_setnice(p, niceval); | |
140 | if (no_nice) { | |
141 | error = no_nice; | |
142 | goto out; | |
143 | } | |
144 | if (error == -ESRCH) | |
145 | error = 0; | |
146 | set_user_nice(p, niceval); | |
147 | out: | |
148 | return error; | |
149 | } | |
150 | ||
754fe8d2 | 151 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
152 | { |
153 | struct task_struct *g, *p; | |
154 | struct user_struct *user; | |
86a264ab | 155 | const struct cred *cred = current_cred(); |
1da177e4 | 156 | int error = -EINVAL; |
41487c65 | 157 | struct pid *pgrp; |
1da177e4 | 158 | |
3e88c553 | 159 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
160 | goto out; |
161 | ||
162 | /* normalize: avoid signed division (rounding problems) */ | |
163 | error = -ESRCH; | |
164 | if (niceval < -20) | |
165 | niceval = -20; | |
166 | if (niceval > 19) | |
167 | niceval = 19; | |
168 | ||
d4581a23 | 169 | rcu_read_lock(); |
1da177e4 LT |
170 | read_lock(&tasklist_lock); |
171 | switch (which) { | |
172 | case PRIO_PROCESS: | |
41487c65 | 173 | if (who) |
228ebcbe | 174 | p = find_task_by_vpid(who); |
41487c65 EB |
175 | else |
176 | p = current; | |
1da177e4 LT |
177 | if (p) |
178 | error = set_one_prio(p, niceval, error); | |
179 | break; | |
180 | case PRIO_PGRP: | |
41487c65 | 181 | if (who) |
b488893a | 182 | pgrp = find_vpid(who); |
41487c65 EB |
183 | else |
184 | pgrp = task_pgrp(current); | |
2d70b68d | 185 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 186 | error = set_one_prio(p, niceval, error); |
2d70b68d | 187 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
188 | break; |
189 | case PRIO_USER: | |
d84f4f99 | 190 | user = (struct user_struct *) cred->user; |
1da177e4 | 191 | if (!who) |
86a264ab DH |
192 | who = cred->uid; |
193 | else if ((who != cred->uid) && | |
194 | !(user = find_user(who))) | |
195 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 196 | |
dfc6a736 | 197 | do_each_thread(g, p) { |
86a264ab | 198 | if (__task_cred(p)->uid == who) |
1da177e4 | 199 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 200 | } while_each_thread(g, p); |
86a264ab | 201 | if (who != cred->uid) |
1da177e4 LT |
202 | free_uid(user); /* For find_user() */ |
203 | break; | |
204 | } | |
205 | out_unlock: | |
206 | read_unlock(&tasklist_lock); | |
d4581a23 | 207 | rcu_read_unlock(); |
1da177e4 LT |
208 | out: |
209 | return error; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Ugh. To avoid negative return values, "getpriority()" will | |
214 | * not return the normal nice-value, but a negated value that | |
215 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
216 | * to stay compatible. | |
217 | */ | |
754fe8d2 | 218 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
219 | { |
220 | struct task_struct *g, *p; | |
221 | struct user_struct *user; | |
86a264ab | 222 | const struct cred *cred = current_cred(); |
1da177e4 | 223 | long niceval, retval = -ESRCH; |
41487c65 | 224 | struct pid *pgrp; |
1da177e4 | 225 | |
3e88c553 | 226 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
227 | return -EINVAL; |
228 | ||
70118837 | 229 | rcu_read_lock(); |
1da177e4 LT |
230 | read_lock(&tasklist_lock); |
231 | switch (which) { | |
232 | case PRIO_PROCESS: | |
41487c65 | 233 | if (who) |
228ebcbe | 234 | p = find_task_by_vpid(who); |
41487c65 EB |
235 | else |
236 | p = current; | |
1da177e4 LT |
237 | if (p) { |
238 | niceval = 20 - task_nice(p); | |
239 | if (niceval > retval) | |
240 | retval = niceval; | |
241 | } | |
242 | break; | |
243 | case PRIO_PGRP: | |
41487c65 | 244 | if (who) |
b488893a | 245 | pgrp = find_vpid(who); |
41487c65 EB |
246 | else |
247 | pgrp = task_pgrp(current); | |
2d70b68d | 248 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
249 | niceval = 20 - task_nice(p); |
250 | if (niceval > retval) | |
251 | retval = niceval; | |
2d70b68d | 252 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
253 | break; |
254 | case PRIO_USER: | |
86a264ab | 255 | user = (struct user_struct *) cred->user; |
1da177e4 | 256 | if (!who) |
86a264ab DH |
257 | who = cred->uid; |
258 | else if ((who != cred->uid) && | |
259 | !(user = find_user(who))) | |
260 | goto out_unlock; /* No processes for this user */ | |
1da177e4 | 261 | |
dfc6a736 | 262 | do_each_thread(g, p) { |
86a264ab | 263 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
264 | niceval = 20 - task_nice(p); |
265 | if (niceval > retval) | |
266 | retval = niceval; | |
267 | } | |
dfc6a736 | 268 | } while_each_thread(g, p); |
86a264ab | 269 | if (who != cred->uid) |
1da177e4 LT |
270 | free_uid(user); /* for find_user() */ |
271 | break; | |
272 | } | |
273 | out_unlock: | |
274 | read_unlock(&tasklist_lock); | |
70118837 | 275 | rcu_read_unlock(); |
1da177e4 LT |
276 | |
277 | return retval; | |
278 | } | |
279 | ||
e4c94330 EB |
280 | /** |
281 | * emergency_restart - reboot the system | |
282 | * | |
283 | * Without shutting down any hardware or taking any locks | |
284 | * reboot the system. This is called when we know we are in | |
285 | * trouble so this is our best effort to reboot. This is | |
286 | * safe to call in interrupt context. | |
287 | */ | |
7c903473 EB |
288 | void emergency_restart(void) |
289 | { | |
04c6862c | 290 | kmsg_dump(KMSG_DUMP_EMERG); |
7c903473 EB |
291 | machine_emergency_restart(); |
292 | } | |
293 | EXPORT_SYMBOL_GPL(emergency_restart); | |
294 | ||
ca195b7f | 295 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 296 | { |
e041c683 | 297 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 298 | system_state = SYSTEM_RESTART; |
4a00ea1e | 299 | device_shutdown(); |
58b3b71d | 300 | sysdev_shutdown(); |
e4c94330 | 301 | } |
1e5d5331 RD |
302 | |
303 | /** | |
304 | * kernel_restart - reboot the system | |
305 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 306 | * or %NULL |
1e5d5331 RD |
307 | * |
308 | * Shutdown everything and perform a clean reboot. | |
309 | * This is not safe to call in interrupt context. | |
310 | */ | |
e4c94330 EB |
311 | void kernel_restart(char *cmd) |
312 | { | |
313 | kernel_restart_prepare(cmd); | |
756184b7 | 314 | if (!cmd) |
4a00ea1e | 315 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 316 | else |
4a00ea1e | 317 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
04c6862c | 318 | kmsg_dump(KMSG_DUMP_RESTART); |
4a00ea1e EB |
319 | machine_restart(cmd); |
320 | } | |
321 | EXPORT_SYMBOL_GPL(kernel_restart); | |
322 | ||
4ef7229f | 323 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 324 | { |
e041c683 | 325 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
326 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
327 | system_state = state; | |
328 | device_shutdown(); | |
329 | } | |
e4c94330 EB |
330 | /** |
331 | * kernel_halt - halt the system | |
332 | * | |
333 | * Shutdown everything and perform a clean system halt. | |
334 | */ | |
e4c94330 EB |
335 | void kernel_halt(void) |
336 | { | |
729b4d4c | 337 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 338 | sysdev_shutdown(); |
4a00ea1e | 339 | printk(KERN_EMERG "System halted.\n"); |
04c6862c | 340 | kmsg_dump(KMSG_DUMP_HALT); |
4a00ea1e EB |
341 | machine_halt(); |
342 | } | |
729b4d4c | 343 | |
4a00ea1e EB |
344 | EXPORT_SYMBOL_GPL(kernel_halt); |
345 | ||
e4c94330 EB |
346 | /** |
347 | * kernel_power_off - power_off the system | |
348 | * | |
349 | * Shutdown everything and perform a clean system power_off. | |
350 | */ | |
e4c94330 EB |
351 | void kernel_power_off(void) |
352 | { | |
729b4d4c | 353 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
354 | if (pm_power_off_prepare) |
355 | pm_power_off_prepare(); | |
4047727e | 356 | disable_nonboot_cpus(); |
58b3b71d | 357 | sysdev_shutdown(); |
4a00ea1e | 358 | printk(KERN_EMERG "Power down.\n"); |
04c6862c | 359 | kmsg_dump(KMSG_DUMP_POWEROFF); |
4a00ea1e EB |
360 | machine_power_off(); |
361 | } | |
362 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
6f15fa50 TG |
363 | |
364 | static DEFINE_MUTEX(reboot_mutex); | |
365 | ||
1da177e4 LT |
366 | /* |
367 | * Reboot system call: for obvious reasons only root may call it, | |
368 | * and even root needs to set up some magic numbers in the registers | |
369 | * so that some mistake won't make this reboot the whole machine. | |
370 | * You can also set the meaning of the ctrl-alt-del-key here. | |
371 | * | |
372 | * reboot doesn't sync: do that yourself before calling this. | |
373 | */ | |
754fe8d2 HC |
374 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
375 | void __user *, arg) | |
1da177e4 LT |
376 | { |
377 | char buffer[256]; | |
3d26dcf7 | 378 | int ret = 0; |
1da177e4 LT |
379 | |
380 | /* We only trust the superuser with rebooting the system. */ | |
381 | if (!capable(CAP_SYS_BOOT)) | |
382 | return -EPERM; | |
383 | ||
384 | /* For safety, we require "magic" arguments. */ | |
385 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
386 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
387 | magic2 != LINUX_REBOOT_MAGIC2A && | |
388 | magic2 != LINUX_REBOOT_MAGIC2B && | |
389 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
390 | return -EINVAL; | |
391 | ||
5e38291d EB |
392 | /* Instead of trying to make the power_off code look like |
393 | * halt when pm_power_off is not set do it the easy way. | |
394 | */ | |
395 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
396 | cmd = LINUX_REBOOT_CMD_HALT; | |
397 | ||
6f15fa50 | 398 | mutex_lock(&reboot_mutex); |
1da177e4 LT |
399 | switch (cmd) { |
400 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 401 | kernel_restart(NULL); |
1da177e4 LT |
402 | break; |
403 | ||
404 | case LINUX_REBOOT_CMD_CAD_ON: | |
405 | C_A_D = 1; | |
406 | break; | |
407 | ||
408 | case LINUX_REBOOT_CMD_CAD_OFF: | |
409 | C_A_D = 0; | |
410 | break; | |
411 | ||
412 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 413 | kernel_halt(); |
1da177e4 | 414 | do_exit(0); |
3d26dcf7 | 415 | panic("cannot halt"); |
1da177e4 LT |
416 | |
417 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 418 | kernel_power_off(); |
1da177e4 LT |
419 | do_exit(0); |
420 | break; | |
421 | ||
422 | case LINUX_REBOOT_CMD_RESTART2: | |
423 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
6f15fa50 TG |
424 | ret = -EFAULT; |
425 | break; | |
1da177e4 LT |
426 | } |
427 | buffer[sizeof(buffer) - 1] = '\0'; | |
428 | ||
4a00ea1e | 429 | kernel_restart(buffer); |
1da177e4 LT |
430 | break; |
431 | ||
3ab83521 | 432 | #ifdef CONFIG_KEXEC |
dc009d92 | 433 | case LINUX_REBOOT_CMD_KEXEC: |
3d26dcf7 AK |
434 | ret = kernel_kexec(); |
435 | break; | |
3ab83521 | 436 | #endif |
4a00ea1e | 437 | |
b0cb1a19 | 438 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 439 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
3d26dcf7 AK |
440 | ret = hibernate(); |
441 | break; | |
1da177e4 LT |
442 | #endif |
443 | ||
444 | default: | |
3d26dcf7 AK |
445 | ret = -EINVAL; |
446 | break; | |
1da177e4 | 447 | } |
6f15fa50 | 448 | mutex_unlock(&reboot_mutex); |
3d26dcf7 | 449 | return ret; |
1da177e4 LT |
450 | } |
451 | ||
65f27f38 | 452 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 453 | { |
abcd9e51 | 454 | kernel_restart(NULL); |
1da177e4 LT |
455 | } |
456 | ||
457 | /* | |
458 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
459 | * As it's called within an interrupt, it may NOT sync: the only choice | |
460 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
461 | */ | |
462 | void ctrl_alt_del(void) | |
463 | { | |
65f27f38 | 464 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
465 | |
466 | if (C_A_D) | |
467 | schedule_work(&cad_work); | |
468 | else | |
9ec52099 | 469 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
470 | } |
471 | ||
1da177e4 LT |
472 | /* |
473 | * Unprivileged users may change the real gid to the effective gid | |
474 | * or vice versa. (BSD-style) | |
475 | * | |
476 | * If you set the real gid at all, or set the effective gid to a value not | |
477 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
478 | * | |
479 | * This makes it possible for a setgid program to completely drop its | |
480 | * privileges, which is often a useful assertion to make when you are doing | |
481 | * a security audit over a program. | |
482 | * | |
483 | * The general idea is that a program which uses just setregid() will be | |
484 | * 100% compatible with BSD. A program which uses just setgid() will be | |
485 | * 100% compatible with POSIX with saved IDs. | |
486 | * | |
487 | * SMP: There are not races, the GIDs are checked only by filesystem | |
488 | * operations (as far as semantic preservation is concerned). | |
489 | */ | |
ae1251ab | 490 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 491 | { |
d84f4f99 DH |
492 | const struct cred *old; |
493 | struct cred *new; | |
1da177e4 LT |
494 | int retval; |
495 | ||
d84f4f99 DH |
496 | new = prepare_creds(); |
497 | if (!new) | |
498 | return -ENOMEM; | |
499 | old = current_cred(); | |
500 | ||
d84f4f99 | 501 | retval = -EPERM; |
1da177e4 | 502 | if (rgid != (gid_t) -1) { |
d84f4f99 DH |
503 | if (old->gid == rgid || |
504 | old->egid == rgid || | |
1da177e4 | 505 | capable(CAP_SETGID)) |
d84f4f99 | 506 | new->gid = rgid; |
1da177e4 | 507 | else |
d84f4f99 | 508 | goto error; |
1da177e4 LT |
509 | } |
510 | if (egid != (gid_t) -1) { | |
d84f4f99 DH |
511 | if (old->gid == egid || |
512 | old->egid == egid || | |
513 | old->sgid == egid || | |
1da177e4 | 514 | capable(CAP_SETGID)) |
d84f4f99 | 515 | new->egid = egid; |
756184b7 | 516 | else |
d84f4f99 | 517 | goto error; |
1da177e4 | 518 | } |
d84f4f99 | 519 | |
1da177e4 | 520 | if (rgid != (gid_t) -1 || |
d84f4f99 DH |
521 | (egid != (gid_t) -1 && egid != old->gid)) |
522 | new->sgid = new->egid; | |
523 | new->fsgid = new->egid; | |
524 | ||
525 | return commit_creds(new); | |
526 | ||
527 | error: | |
528 | abort_creds(new); | |
529 | return retval; | |
1da177e4 LT |
530 | } |
531 | ||
532 | /* | |
533 | * setgid() is implemented like SysV w/ SAVED_IDS | |
534 | * | |
535 | * SMP: Same implicit races as above. | |
536 | */ | |
ae1251ab | 537 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 538 | { |
d84f4f99 DH |
539 | const struct cred *old; |
540 | struct cred *new; | |
1da177e4 LT |
541 | int retval; |
542 | ||
d84f4f99 DH |
543 | new = prepare_creds(); |
544 | if (!new) | |
545 | return -ENOMEM; | |
546 | old = current_cred(); | |
547 | ||
d84f4f99 DH |
548 | retval = -EPERM; |
549 | if (capable(CAP_SETGID)) | |
550 | new->gid = new->egid = new->sgid = new->fsgid = gid; | |
551 | else if (gid == old->gid || gid == old->sgid) | |
552 | new->egid = new->fsgid = gid; | |
1da177e4 | 553 | else |
d84f4f99 | 554 | goto error; |
1da177e4 | 555 | |
d84f4f99 DH |
556 | return commit_creds(new); |
557 | ||
558 | error: | |
559 | abort_creds(new); | |
560 | return retval; | |
1da177e4 | 561 | } |
54e99124 | 562 | |
d84f4f99 DH |
563 | /* |
564 | * change the user struct in a credentials set to match the new UID | |
565 | */ | |
566 | static int set_user(struct cred *new) | |
1da177e4 LT |
567 | { |
568 | struct user_struct *new_user; | |
569 | ||
18b6e041 | 570 | new_user = alloc_uid(current_user_ns(), new->uid); |
1da177e4 LT |
571 | if (!new_user) |
572 | return -EAGAIN; | |
573 | ||
78d7d407 | 574 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
18b6e041 | 575 | new_user != INIT_USER) { |
1da177e4 LT |
576 | free_uid(new_user); |
577 | return -EAGAIN; | |
578 | } | |
579 | ||
d84f4f99 DH |
580 | free_uid(new->user); |
581 | new->user = new_user; | |
1da177e4 LT |
582 | return 0; |
583 | } | |
584 | ||
585 | /* | |
586 | * Unprivileged users may change the real uid to the effective uid | |
587 | * or vice versa. (BSD-style) | |
588 | * | |
589 | * If you set the real uid at all, or set the effective uid to a value not | |
590 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
591 | * | |
592 | * This makes it possible for a setuid program to completely drop its | |
593 | * privileges, which is often a useful assertion to make when you are doing | |
594 | * a security audit over a program. | |
595 | * | |
596 | * The general idea is that a program which uses just setreuid() will be | |
597 | * 100% compatible with BSD. A program which uses just setuid() will be | |
598 | * 100% compatible with POSIX with saved IDs. | |
599 | */ | |
ae1251ab | 600 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 601 | { |
d84f4f99 DH |
602 | const struct cred *old; |
603 | struct cred *new; | |
1da177e4 LT |
604 | int retval; |
605 | ||
d84f4f99 DH |
606 | new = prepare_creds(); |
607 | if (!new) | |
608 | return -ENOMEM; | |
609 | old = current_cred(); | |
610 | ||
d84f4f99 | 611 | retval = -EPERM; |
1da177e4 | 612 | if (ruid != (uid_t) -1) { |
d84f4f99 DH |
613 | new->uid = ruid; |
614 | if (old->uid != ruid && | |
615 | old->euid != ruid && | |
1da177e4 | 616 | !capable(CAP_SETUID)) |
d84f4f99 | 617 | goto error; |
1da177e4 LT |
618 | } |
619 | ||
620 | if (euid != (uid_t) -1) { | |
d84f4f99 DH |
621 | new->euid = euid; |
622 | if (old->uid != euid && | |
623 | old->euid != euid && | |
624 | old->suid != euid && | |
1da177e4 | 625 | !capable(CAP_SETUID)) |
d84f4f99 | 626 | goto error; |
1da177e4 LT |
627 | } |
628 | ||
54e99124 DG |
629 | if (new->uid != old->uid) { |
630 | retval = set_user(new); | |
631 | if (retval < 0) | |
632 | goto error; | |
633 | } | |
1da177e4 | 634 | if (ruid != (uid_t) -1 || |
d84f4f99 DH |
635 | (euid != (uid_t) -1 && euid != old->uid)) |
636 | new->suid = new->euid; | |
637 | new->fsuid = new->euid; | |
1da177e4 | 638 | |
d84f4f99 DH |
639 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
640 | if (retval < 0) | |
641 | goto error; | |
1da177e4 | 642 | |
d84f4f99 | 643 | return commit_creds(new); |
1da177e4 | 644 | |
d84f4f99 DH |
645 | error: |
646 | abort_creds(new); | |
647 | return retval; | |
648 | } | |
1da177e4 LT |
649 | |
650 | /* | |
651 | * setuid() is implemented like SysV with SAVED_IDS | |
652 | * | |
653 | * Note that SAVED_ID's is deficient in that a setuid root program | |
654 | * like sendmail, for example, cannot set its uid to be a normal | |
655 | * user and then switch back, because if you're root, setuid() sets | |
656 | * the saved uid too. If you don't like this, blame the bright people | |
657 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
658 | * will allow a root program to temporarily drop privileges and be able to | |
659 | * regain them by swapping the real and effective uid. | |
660 | */ | |
ae1251ab | 661 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 662 | { |
d84f4f99 DH |
663 | const struct cred *old; |
664 | struct cred *new; | |
1da177e4 LT |
665 | int retval; |
666 | ||
d84f4f99 DH |
667 | new = prepare_creds(); |
668 | if (!new) | |
669 | return -ENOMEM; | |
670 | old = current_cred(); | |
671 | ||
d84f4f99 | 672 | retval = -EPERM; |
1da177e4 | 673 | if (capable(CAP_SETUID)) { |
d84f4f99 | 674 | new->suid = new->uid = uid; |
54e99124 DG |
675 | if (uid != old->uid) { |
676 | retval = set_user(new); | |
677 | if (retval < 0) | |
678 | goto error; | |
d84f4f99 DH |
679 | } |
680 | } else if (uid != old->uid && uid != new->suid) { | |
681 | goto error; | |
1da177e4 | 682 | } |
1da177e4 | 683 | |
d84f4f99 DH |
684 | new->fsuid = new->euid = uid; |
685 | ||
686 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
687 | if (retval < 0) | |
688 | goto error; | |
1da177e4 | 689 | |
d84f4f99 | 690 | return commit_creds(new); |
1da177e4 | 691 | |
d84f4f99 DH |
692 | error: |
693 | abort_creds(new); | |
694 | return retval; | |
1da177e4 LT |
695 | } |
696 | ||
697 | ||
698 | /* | |
699 | * This function implements a generic ability to update ruid, euid, | |
700 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
701 | */ | |
ae1251ab | 702 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 703 | { |
d84f4f99 DH |
704 | const struct cred *old; |
705 | struct cred *new; | |
1da177e4 LT |
706 | int retval; |
707 | ||
d84f4f99 DH |
708 | new = prepare_creds(); |
709 | if (!new) | |
710 | return -ENOMEM; | |
711 | ||
d84f4f99 | 712 | old = current_cred(); |
1da177e4 | 713 | |
d84f4f99 | 714 | retval = -EPERM; |
1da177e4 | 715 | if (!capable(CAP_SETUID)) { |
d84f4f99 DH |
716 | if (ruid != (uid_t) -1 && ruid != old->uid && |
717 | ruid != old->euid && ruid != old->suid) | |
718 | goto error; | |
719 | if (euid != (uid_t) -1 && euid != old->uid && | |
720 | euid != old->euid && euid != old->suid) | |
721 | goto error; | |
722 | if (suid != (uid_t) -1 && suid != old->uid && | |
723 | suid != old->euid && suid != old->suid) | |
724 | goto error; | |
1da177e4 | 725 | } |
d84f4f99 | 726 | |
1da177e4 | 727 | if (ruid != (uid_t) -1) { |
d84f4f99 | 728 | new->uid = ruid; |
54e99124 DG |
729 | if (ruid != old->uid) { |
730 | retval = set_user(new); | |
731 | if (retval < 0) | |
732 | goto error; | |
733 | } | |
1da177e4 | 734 | } |
d84f4f99 DH |
735 | if (euid != (uid_t) -1) |
736 | new->euid = euid; | |
1da177e4 | 737 | if (suid != (uid_t) -1) |
d84f4f99 DH |
738 | new->suid = suid; |
739 | new->fsuid = new->euid; | |
1da177e4 | 740 | |
d84f4f99 DH |
741 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
742 | if (retval < 0) | |
743 | goto error; | |
1da177e4 | 744 | |
d84f4f99 | 745 | return commit_creds(new); |
1da177e4 | 746 | |
d84f4f99 DH |
747 | error: |
748 | abort_creds(new); | |
749 | return retval; | |
1da177e4 LT |
750 | } |
751 | ||
dbf040d9 | 752 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid) |
1da177e4 | 753 | { |
86a264ab | 754 | const struct cred *cred = current_cred(); |
1da177e4 LT |
755 | int retval; |
756 | ||
86a264ab DH |
757 | if (!(retval = put_user(cred->uid, ruid)) && |
758 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 759 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
760 | |
761 | return retval; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Same as above, but for rgid, egid, sgid. | |
766 | */ | |
ae1251ab | 767 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 768 | { |
d84f4f99 DH |
769 | const struct cred *old; |
770 | struct cred *new; | |
1da177e4 LT |
771 | int retval; |
772 | ||
d84f4f99 DH |
773 | new = prepare_creds(); |
774 | if (!new) | |
775 | return -ENOMEM; | |
776 | old = current_cred(); | |
777 | ||
d84f4f99 | 778 | retval = -EPERM; |
1da177e4 | 779 | if (!capable(CAP_SETGID)) { |
d84f4f99 DH |
780 | if (rgid != (gid_t) -1 && rgid != old->gid && |
781 | rgid != old->egid && rgid != old->sgid) | |
782 | goto error; | |
783 | if (egid != (gid_t) -1 && egid != old->gid && | |
784 | egid != old->egid && egid != old->sgid) | |
785 | goto error; | |
786 | if (sgid != (gid_t) -1 && sgid != old->gid && | |
787 | sgid != old->egid && sgid != old->sgid) | |
788 | goto error; | |
1da177e4 | 789 | } |
d84f4f99 | 790 | |
1da177e4 | 791 | if (rgid != (gid_t) -1) |
d84f4f99 DH |
792 | new->gid = rgid; |
793 | if (egid != (gid_t) -1) | |
794 | new->egid = egid; | |
1da177e4 | 795 | if (sgid != (gid_t) -1) |
d84f4f99 DH |
796 | new->sgid = sgid; |
797 | new->fsgid = new->egid; | |
1da177e4 | 798 | |
d84f4f99 DH |
799 | return commit_creds(new); |
800 | ||
801 | error: | |
802 | abort_creds(new); | |
803 | return retval; | |
1da177e4 LT |
804 | } |
805 | ||
dbf040d9 | 806 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid) |
1da177e4 | 807 | { |
86a264ab | 808 | const struct cred *cred = current_cred(); |
1da177e4 LT |
809 | int retval; |
810 | ||
86a264ab DH |
811 | if (!(retval = put_user(cred->gid, rgid)) && |
812 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 813 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
814 | |
815 | return retval; | |
816 | } | |
817 | ||
818 | ||
819 | /* | |
820 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
821 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
822 | * whatever uid it wants to). It normally shadows "euid", except when | |
823 | * explicitly set by setfsuid() or for access.. | |
824 | */ | |
ae1251ab | 825 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 826 | { |
d84f4f99 DH |
827 | const struct cred *old; |
828 | struct cred *new; | |
829 | uid_t old_fsuid; | |
1da177e4 | 830 | |
d84f4f99 DH |
831 | new = prepare_creds(); |
832 | if (!new) | |
833 | return current_fsuid(); | |
834 | old = current_cred(); | |
835 | old_fsuid = old->fsuid; | |
1da177e4 | 836 | |
d84f4f99 DH |
837 | if (uid == old->uid || uid == old->euid || |
838 | uid == old->suid || uid == old->fsuid || | |
756184b7 CP |
839 | capable(CAP_SETUID)) { |
840 | if (uid != old_fsuid) { | |
d84f4f99 DH |
841 | new->fsuid = uid; |
842 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) | |
843 | goto change_okay; | |
1da177e4 | 844 | } |
1da177e4 LT |
845 | } |
846 | ||
d84f4f99 DH |
847 | abort_creds(new); |
848 | return old_fsuid; | |
1da177e4 | 849 | |
d84f4f99 DH |
850 | change_okay: |
851 | commit_creds(new); | |
1da177e4 LT |
852 | return old_fsuid; |
853 | } | |
854 | ||
855 | /* | |
f42df9e6 | 856 | * Samma på svenska.. |
1da177e4 | 857 | */ |
ae1251ab | 858 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 859 | { |
d84f4f99 DH |
860 | const struct cred *old; |
861 | struct cred *new; | |
862 | gid_t old_fsgid; | |
863 | ||
864 | new = prepare_creds(); | |
865 | if (!new) | |
866 | return current_fsgid(); | |
867 | old = current_cred(); | |
868 | old_fsgid = old->fsgid; | |
1da177e4 | 869 | |
d84f4f99 DH |
870 | if (gid == old->gid || gid == old->egid || |
871 | gid == old->sgid || gid == old->fsgid || | |
756184b7 CP |
872 | capable(CAP_SETGID)) { |
873 | if (gid != old_fsgid) { | |
d84f4f99 DH |
874 | new->fsgid = gid; |
875 | goto change_okay; | |
1da177e4 | 876 | } |
1da177e4 | 877 | } |
d84f4f99 | 878 | |
d84f4f99 DH |
879 | abort_creds(new); |
880 | return old_fsgid; | |
881 | ||
882 | change_okay: | |
883 | commit_creds(new); | |
1da177e4 LT |
884 | return old_fsgid; |
885 | } | |
886 | ||
f06febc9 FM |
887 | void do_sys_times(struct tms *tms) |
888 | { | |
0cf55e1e | 889 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 890 | |
2b5fe6de | 891 | spin_lock_irq(¤t->sighand->siglock); |
0cf55e1e | 892 | thread_group_times(current, &tgutime, &tgstime); |
f06febc9 FM |
893 | cutime = current->signal->cutime; |
894 | cstime = current->signal->cstime; | |
895 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
896 | tms->tms_utime = cputime_to_clock_t(tgutime); |
897 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
898 | tms->tms_cutime = cputime_to_clock_t(cutime); |
899 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
900 | } | |
901 | ||
58fd3aa2 | 902 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 903 | { |
1da177e4 LT |
904 | if (tbuf) { |
905 | struct tms tmp; | |
f06febc9 FM |
906 | |
907 | do_sys_times(&tmp); | |
1da177e4 LT |
908 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
909 | return -EFAULT; | |
910 | } | |
e3d5a27d | 911 | force_successful_syscall_return(); |
1da177e4 LT |
912 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
913 | } | |
914 | ||
915 | /* | |
916 | * This needs some heavy checking ... | |
917 | * I just haven't the stomach for it. I also don't fully | |
918 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
919 | * | |
920 | * OK, I think I have the protection semantics right.... this is really | |
921 | * only important on a multi-user system anyway, to make sure one user | |
922 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
923 | * | |
924 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
925 | * LBT 04.03.94 | |
926 | */ | |
b290ebe2 | 927 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
928 | { |
929 | struct task_struct *p; | |
ee0acf90 | 930 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
931 | struct pid *pgrp; |
932 | int err; | |
1da177e4 LT |
933 | |
934 | if (!pid) | |
b488893a | 935 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
936 | if (!pgid) |
937 | pgid = pid; | |
938 | if (pgid < 0) | |
939 | return -EINVAL; | |
950eaaca | 940 | rcu_read_lock(); |
1da177e4 LT |
941 | |
942 | /* From this point forward we keep holding onto the tasklist lock | |
943 | * so that our parent does not change from under us. -DaveM | |
944 | */ | |
945 | write_lock_irq(&tasklist_lock); | |
946 | ||
947 | err = -ESRCH; | |
4e021306 | 948 | p = find_task_by_vpid(pid); |
1da177e4 LT |
949 | if (!p) |
950 | goto out; | |
951 | ||
952 | err = -EINVAL; | |
953 | if (!thread_group_leader(p)) | |
954 | goto out; | |
955 | ||
4e021306 | 956 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 957 | err = -EPERM; |
41487c65 | 958 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
959 | goto out; |
960 | err = -EACCES; | |
961 | if (p->did_exec) | |
962 | goto out; | |
963 | } else { | |
964 | err = -ESRCH; | |
ee0acf90 | 965 | if (p != group_leader) |
1da177e4 LT |
966 | goto out; |
967 | } | |
968 | ||
969 | err = -EPERM; | |
970 | if (p->signal->leader) | |
971 | goto out; | |
972 | ||
4e021306 | 973 | pgrp = task_pid(p); |
1da177e4 | 974 | if (pgid != pid) { |
b488893a | 975 | struct task_struct *g; |
1da177e4 | 976 | |
4e021306 ON |
977 | pgrp = find_vpid(pgid); |
978 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 979 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 980 | goto out; |
1da177e4 LT |
981 | } |
982 | ||
1da177e4 LT |
983 | err = security_task_setpgid(p, pgid); |
984 | if (err) | |
985 | goto out; | |
986 | ||
1b0f7ffd | 987 | if (task_pgrp(p) != pgrp) |
83beaf3c | 988 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
989 | |
990 | err = 0; | |
991 | out: | |
992 | /* All paths lead to here, thus we are safe. -DaveM */ | |
993 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 994 | rcu_read_unlock(); |
1da177e4 LT |
995 | return err; |
996 | } | |
997 | ||
dbf040d9 | 998 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 999 | { |
12a3de0a ON |
1000 | struct task_struct *p; |
1001 | struct pid *grp; | |
1002 | int retval; | |
1003 | ||
1004 | rcu_read_lock(); | |
756184b7 | 1005 | if (!pid) |
12a3de0a | 1006 | grp = task_pgrp(current); |
756184b7 | 1007 | else { |
1da177e4 | 1008 | retval = -ESRCH; |
12a3de0a ON |
1009 | p = find_task_by_vpid(pid); |
1010 | if (!p) | |
1011 | goto out; | |
1012 | grp = task_pgrp(p); | |
1013 | if (!grp) | |
1014 | goto out; | |
1015 | ||
1016 | retval = security_task_getpgid(p); | |
1017 | if (retval) | |
1018 | goto out; | |
1da177e4 | 1019 | } |
12a3de0a ON |
1020 | retval = pid_vnr(grp); |
1021 | out: | |
1022 | rcu_read_unlock(); | |
1023 | return retval; | |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1027 | ||
dbf040d9 | 1028 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1029 | { |
12a3de0a | 1030 | return sys_getpgid(0); |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | #endif | |
1034 | ||
dbf040d9 | 1035 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1036 | { |
1dd768c0 ON |
1037 | struct task_struct *p; |
1038 | struct pid *sid; | |
1039 | int retval; | |
1040 | ||
1041 | rcu_read_lock(); | |
756184b7 | 1042 | if (!pid) |
1dd768c0 | 1043 | sid = task_session(current); |
756184b7 | 1044 | else { |
1da177e4 | 1045 | retval = -ESRCH; |
1dd768c0 ON |
1046 | p = find_task_by_vpid(pid); |
1047 | if (!p) | |
1048 | goto out; | |
1049 | sid = task_session(p); | |
1050 | if (!sid) | |
1051 | goto out; | |
1052 | ||
1053 | retval = security_task_getsid(p); | |
1054 | if (retval) | |
1055 | goto out; | |
1da177e4 | 1056 | } |
1dd768c0 ON |
1057 | retval = pid_vnr(sid); |
1058 | out: | |
1059 | rcu_read_unlock(); | |
1060 | return retval; | |
1da177e4 LT |
1061 | } |
1062 | ||
b290ebe2 | 1063 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1064 | { |
e19f247a | 1065 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1066 | struct pid *sid = task_pid(group_leader); |
1067 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1068 | int err = -EPERM; |
1069 | ||
1da177e4 | 1070 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1071 | /* Fail if I am already a session leader */ |
1072 | if (group_leader->signal->leader) | |
1073 | goto out; | |
1074 | ||
430c6231 ON |
1075 | /* Fail if a process group id already exists that equals the |
1076 | * proposed session id. | |
390e2ff0 | 1077 | */ |
6806aac6 | 1078 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1079 | goto out; |
1080 | ||
e19f247a | 1081 | group_leader->signal->leader = 1; |
8520d7c7 | 1082 | __set_special_pids(sid); |
24ec839c | 1083 | |
9c9f4ded | 1084 | proc_clear_tty(group_leader); |
24ec839c | 1085 | |
e4cc0a9c | 1086 | err = session; |
1da177e4 LT |
1087 | out: |
1088 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1089 | if (err > 0) { |
0d0df599 | 1090 | proc_sid_connector(group_leader); |
5091faa4 MG |
1091 | sched_autogroup_create_attach(group_leader); |
1092 | } | |
1da177e4 LT |
1093 | return err; |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | DECLARE_RWSEM(uts_sem); |
1097 | ||
e28cbf22 CH |
1098 | #ifdef COMPAT_UTS_MACHINE |
1099 | #define override_architecture(name) \ | |
46da2766 | 1100 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1101 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1102 | sizeof(COMPAT_UTS_MACHINE))) | |
1103 | #else | |
1104 | #define override_architecture(name) 0 | |
1105 | #endif | |
1106 | ||
e48fbb69 | 1107 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1108 | { |
1109 | int errno = 0; | |
1110 | ||
1111 | down_read(&uts_sem); | |
e9ff3990 | 1112 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1113 | errno = -EFAULT; |
1114 | up_read(&uts_sem); | |
e28cbf22 CH |
1115 | |
1116 | if (!errno && override_architecture(name)) | |
1117 | errno = -EFAULT; | |
1da177e4 LT |
1118 | return errno; |
1119 | } | |
1120 | ||
5cacdb4a CH |
1121 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1122 | /* | |
1123 | * Old cruft | |
1124 | */ | |
1125 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1126 | { | |
1127 | int error = 0; | |
1128 | ||
1129 | if (!name) | |
1130 | return -EFAULT; | |
1131 | ||
1132 | down_read(&uts_sem); | |
1133 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1134 | error = -EFAULT; | |
1135 | up_read(&uts_sem); | |
1136 | ||
1137 | if (!error && override_architecture(name)) | |
1138 | error = -EFAULT; | |
1139 | return error; | |
1140 | } | |
1141 | ||
1142 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1143 | { | |
1144 | int error; | |
1145 | ||
1146 | if (!name) | |
1147 | return -EFAULT; | |
1148 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1149 | return -EFAULT; | |
1150 | ||
1151 | down_read(&uts_sem); | |
1152 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1153 | __OLD_UTS_LEN); | |
1154 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1155 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1156 | __OLD_UTS_LEN); | |
1157 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1158 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1159 | __OLD_UTS_LEN); | |
1160 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1161 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1162 | __OLD_UTS_LEN); | |
1163 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1164 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1165 | __OLD_UTS_LEN); | |
1166 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1167 | up_read(&uts_sem); | |
1168 | ||
1169 | if (!error && override_architecture(name)) | |
1170 | error = -EFAULT; | |
1171 | return error ? -EFAULT : 0; | |
1172 | } | |
1173 | #endif | |
1174 | ||
5a8a82b1 | 1175 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1176 | { |
1177 | int errno; | |
1178 | char tmp[__NEW_UTS_LEN]; | |
1179 | ||
1180 | if (!capable(CAP_SYS_ADMIN)) | |
1181 | return -EPERM; | |
1182 | if (len < 0 || len > __NEW_UTS_LEN) | |
1183 | return -EINVAL; | |
1184 | down_write(&uts_sem); | |
1185 | errno = -EFAULT; | |
1186 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1187 | struct new_utsname *u = utsname(); |
1188 | ||
1189 | memcpy(u->nodename, tmp, len); | |
1190 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1191 | errno = 0; |
1192 | } | |
1193 | up_write(&uts_sem); | |
1194 | return errno; | |
1195 | } | |
1196 | ||
1197 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1198 | ||
5a8a82b1 | 1199 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1200 | { |
1201 | int i, errno; | |
9679e4dd | 1202 | struct new_utsname *u; |
1da177e4 LT |
1203 | |
1204 | if (len < 0) | |
1205 | return -EINVAL; | |
1206 | down_read(&uts_sem); | |
9679e4dd AM |
1207 | u = utsname(); |
1208 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1209 | if (i > len) |
1210 | i = len; | |
1211 | errno = 0; | |
9679e4dd | 1212 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1213 | errno = -EFAULT; |
1214 | up_read(&uts_sem); | |
1215 | return errno; | |
1216 | } | |
1217 | ||
1218 | #endif | |
1219 | ||
1220 | /* | |
1221 | * Only setdomainname; getdomainname can be implemented by calling | |
1222 | * uname() | |
1223 | */ | |
5a8a82b1 | 1224 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1225 | { |
1226 | int errno; | |
1227 | char tmp[__NEW_UTS_LEN]; | |
1228 | ||
1229 | if (!capable(CAP_SYS_ADMIN)) | |
1230 | return -EPERM; | |
1231 | if (len < 0 || len > __NEW_UTS_LEN) | |
1232 | return -EINVAL; | |
1233 | ||
1234 | down_write(&uts_sem); | |
1235 | errno = -EFAULT; | |
1236 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1237 | struct new_utsname *u = utsname(); |
1238 | ||
1239 | memcpy(u->domainname, tmp, len); | |
1240 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1241 | errno = 0; |
1242 | } | |
1243 | up_write(&uts_sem); | |
1244 | return errno; | |
1245 | } | |
1246 | ||
e48fbb69 | 1247 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1248 | { |
b9518345 JS |
1249 | struct rlimit value; |
1250 | int ret; | |
1251 | ||
1252 | ret = do_prlimit(current, resource, NULL, &value); | |
1253 | if (!ret) | |
1254 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1255 | ||
1256 | return ret; | |
1da177e4 LT |
1257 | } |
1258 | ||
1259 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1260 | ||
1261 | /* | |
1262 | * Back compatibility for getrlimit. Needed for some apps. | |
1263 | */ | |
1264 | ||
e48fbb69 HC |
1265 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1266 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1267 | { |
1268 | struct rlimit x; | |
1269 | if (resource >= RLIM_NLIMITS) | |
1270 | return -EINVAL; | |
1271 | ||
1272 | task_lock(current->group_leader); | |
1273 | x = current->signal->rlim[resource]; | |
1274 | task_unlock(current->group_leader); | |
756184b7 | 1275 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1276 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1277 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1278 | x.rlim_max = 0x7FFFFFFF; |
1279 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1280 | } | |
1281 | ||
1282 | #endif | |
1283 | ||
c022a0ac JS |
1284 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1285 | { | |
1286 | #if BITS_PER_LONG < 64 | |
1287 | return rlim64 >= ULONG_MAX; | |
1288 | #else | |
1289 | return rlim64 == RLIM64_INFINITY; | |
1290 | #endif | |
1291 | } | |
1292 | ||
1293 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1294 | { | |
1295 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1296 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1297 | else | |
1298 | rlim64->rlim_cur = rlim->rlim_cur; | |
1299 | if (rlim->rlim_max == RLIM_INFINITY) | |
1300 | rlim64->rlim_max = RLIM64_INFINITY; | |
1301 | else | |
1302 | rlim64->rlim_max = rlim->rlim_max; | |
1303 | } | |
1304 | ||
1305 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1306 | { | |
1307 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1308 | rlim->rlim_cur = RLIM_INFINITY; | |
1309 | else | |
1310 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1311 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1312 | rlim->rlim_max = RLIM_INFINITY; | |
1313 | else | |
1314 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1315 | } | |
1316 | ||
1c1e618d | 1317 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1318 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1319 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1320 | { |
5b41535a | 1321 | struct rlimit *rlim; |
86f162f4 | 1322 | int retval = 0; |
1da177e4 LT |
1323 | |
1324 | if (resource >= RLIM_NLIMITS) | |
1325 | return -EINVAL; | |
5b41535a JS |
1326 | if (new_rlim) { |
1327 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1328 | return -EINVAL; | |
1329 | if (resource == RLIMIT_NOFILE && | |
1330 | new_rlim->rlim_max > sysctl_nr_open) | |
1331 | return -EPERM; | |
1332 | } | |
1da177e4 | 1333 | |
1c1e618d JS |
1334 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1335 | read_lock(&tasklist_lock); | |
1336 | if (!tsk->sighand) { | |
1337 | retval = -ESRCH; | |
1338 | goto out; | |
1339 | } | |
1340 | ||
5b41535a | 1341 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1342 | task_lock(tsk->group_leader); |
5b41535a JS |
1343 | if (new_rlim) { |
1344 | if (new_rlim->rlim_max > rlim->rlim_max && | |
1345 | !capable(CAP_SYS_RESOURCE)) | |
1346 | retval = -EPERM; | |
1347 | if (!retval) | |
1348 | retval = security_task_setrlimit(tsk->group_leader, | |
1349 | resource, new_rlim); | |
1350 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1351 | /* | |
1352 | * The caller is asking for an immediate RLIMIT_CPU | |
1353 | * expiry. But we use the zero value to mean "it was | |
1354 | * never set". So let's cheat and make it one second | |
1355 | * instead | |
1356 | */ | |
1357 | new_rlim->rlim_cur = 1; | |
1358 | } | |
1359 | } | |
1360 | if (!retval) { | |
1361 | if (old_rlim) | |
1362 | *old_rlim = *rlim; | |
1363 | if (new_rlim) | |
1364 | *rlim = *new_rlim; | |
9926e4c7 | 1365 | } |
7855c35d | 1366 | task_unlock(tsk->group_leader); |
1da177e4 | 1367 | |
d3561f78 AM |
1368 | /* |
1369 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1370 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1371 | * very long-standing error, and fixing it now risks breakage of | |
1372 | * applications, so we live with it | |
1373 | */ | |
5b41535a JS |
1374 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
1375 | new_rlim->rlim_cur != RLIM_INFINITY) | |
1376 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); | |
ec9e16ba | 1377 | out: |
1c1e618d | 1378 | read_unlock(&tasklist_lock); |
2fb9d268 | 1379 | return retval; |
1da177e4 LT |
1380 | } |
1381 | ||
c022a0ac JS |
1382 | /* rcu lock must be held */ |
1383 | static int check_prlimit_permission(struct task_struct *task) | |
1384 | { | |
1385 | const struct cred *cred = current_cred(), *tcred; | |
1386 | ||
1387 | tcred = __task_cred(task); | |
aa5bd67d KK |
1388 | if (current != task && |
1389 | (cred->uid != tcred->euid || | |
c022a0ac JS |
1390 | cred->uid != tcred->suid || |
1391 | cred->uid != tcred->uid || | |
1392 | cred->gid != tcred->egid || | |
1393 | cred->gid != tcred->sgid || | |
1394 | cred->gid != tcred->gid) && | |
1395 | !capable(CAP_SYS_RESOURCE)) { | |
1396 | return -EPERM; | |
1397 | } | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1403 | const struct rlimit64 __user *, new_rlim, | |
1404 | struct rlimit64 __user *, old_rlim) | |
1405 | { | |
1406 | struct rlimit64 old64, new64; | |
1407 | struct rlimit old, new; | |
1408 | struct task_struct *tsk; | |
1409 | int ret; | |
1410 | ||
1411 | if (new_rlim) { | |
1412 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1413 | return -EFAULT; | |
1414 | rlim64_to_rlim(&new64, &new); | |
1415 | } | |
1416 | ||
1417 | rcu_read_lock(); | |
1418 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1419 | if (!tsk) { | |
1420 | rcu_read_unlock(); | |
1421 | return -ESRCH; | |
1422 | } | |
1423 | ret = check_prlimit_permission(tsk); | |
1424 | if (ret) { | |
1425 | rcu_read_unlock(); | |
1426 | return ret; | |
1427 | } | |
1428 | get_task_struct(tsk); | |
1429 | rcu_read_unlock(); | |
1430 | ||
1431 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1432 | old_rlim ? &old : NULL); | |
1433 | ||
1434 | if (!ret && old_rlim) { | |
1435 | rlim_to_rlim64(&old, &old64); | |
1436 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1437 | ret = -EFAULT; | |
1438 | } | |
1439 | ||
1440 | put_task_struct(tsk); | |
1441 | return ret; | |
1442 | } | |
1443 | ||
7855c35d JS |
1444 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1445 | { | |
1446 | struct rlimit new_rlim; | |
1447 | ||
1448 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1449 | return -EFAULT; | |
5b41535a | 1450 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1451 | } |
1452 | ||
1da177e4 LT |
1453 | /* |
1454 | * It would make sense to put struct rusage in the task_struct, | |
1455 | * except that would make the task_struct be *really big*. After | |
1456 | * task_struct gets moved into malloc'ed memory, it would | |
1457 | * make sense to do this. It will make moving the rest of the information | |
1458 | * a lot simpler! (Which we're not doing right now because we're not | |
1459 | * measuring them yet). | |
1460 | * | |
1da177e4 LT |
1461 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1462 | * races with threads incrementing their own counters. But since word | |
1463 | * reads are atomic, we either get new values or old values and we don't | |
1464 | * care which for the sums. We always take the siglock to protect reading | |
1465 | * the c* fields from p->signal from races with exit.c updating those | |
1466 | * fields when reaping, so a sample either gets all the additions of a | |
1467 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1468 | * |
de047c1b RT |
1469 | * Locking: |
1470 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1471 | * for the cases current multithreaded, non-current single threaded | |
1472 | * non-current multithreaded. Thread traversal is now safe with | |
1473 | * the siglock held. | |
1474 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1475 | * single threaded, as no one else can take our signal_struct away, no one | |
1476 | * else can reap the children to update signal->c* counters, and no one else | |
1477 | * can race with the signal-> fields. If we do not take any lock, the | |
1478 | * signal-> fields could be read out of order while another thread was just | |
1479 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1480 | * On the writer side, write memory barrier is implied in __exit_signal | |
1481 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1482 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1483 | * |
1da177e4 LT |
1484 | */ |
1485 | ||
f06febc9 | 1486 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1487 | { |
679c9cd4 SK |
1488 | r->ru_nvcsw += t->nvcsw; |
1489 | r->ru_nivcsw += t->nivcsw; | |
1490 | r->ru_minflt += t->min_flt; | |
1491 | r->ru_majflt += t->maj_flt; | |
1492 | r->ru_inblock += task_io_get_inblock(t); | |
1493 | r->ru_oublock += task_io_get_oublock(t); | |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1497 | { | |
1498 | struct task_struct *t; | |
1499 | unsigned long flags; | |
0cf55e1e | 1500 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1501 | unsigned long maxrss = 0; |
1da177e4 LT |
1502 | |
1503 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1504 | utime = stime = cputime_zero; |
1da177e4 | 1505 | |
679c9cd4 | 1506 | if (who == RUSAGE_THREAD) { |
d180c5bc | 1507 | task_times(current, &utime, &stime); |
f06febc9 | 1508 | accumulate_thread_rusage(p, r); |
1f10206c | 1509 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1510 | goto out; |
1511 | } | |
1512 | ||
d6cf723a | 1513 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1514 | return; |
0f59cc4a | 1515 | |
1da177e4 | 1516 | switch (who) { |
0f59cc4a | 1517 | case RUSAGE_BOTH: |
1da177e4 | 1518 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1519 | utime = p->signal->cutime; |
1520 | stime = p->signal->cstime; | |
1521 | r->ru_nvcsw = p->signal->cnvcsw; | |
1522 | r->ru_nivcsw = p->signal->cnivcsw; | |
1523 | r->ru_minflt = p->signal->cmin_flt; | |
1524 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1525 | r->ru_inblock = p->signal->cinblock; |
1526 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1527 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1528 | |
1529 | if (who == RUSAGE_CHILDREN) | |
1530 | break; | |
1531 | ||
1da177e4 | 1532 | case RUSAGE_SELF: |
0cf55e1e HS |
1533 | thread_group_times(p, &tgutime, &tgstime); |
1534 | utime = cputime_add(utime, tgutime); | |
1535 | stime = cputime_add(stime, tgstime); | |
1da177e4 LT |
1536 | r->ru_nvcsw += p->signal->nvcsw; |
1537 | r->ru_nivcsw += p->signal->nivcsw; | |
1538 | r->ru_minflt += p->signal->min_flt; | |
1539 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1540 | r->ru_inblock += p->signal->inblock; |
1541 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1542 | if (maxrss < p->signal->maxrss) |
1543 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1544 | t = p; |
1545 | do { | |
f06febc9 | 1546 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1547 | t = next_thread(t); |
1548 | } while (t != p); | |
1da177e4 | 1549 | break; |
0f59cc4a | 1550 | |
1da177e4 LT |
1551 | default: |
1552 | BUG(); | |
1553 | } | |
de047c1b | 1554 | unlock_task_sighand(p, &flags); |
de047c1b | 1555 | |
679c9cd4 | 1556 | out: |
0f59cc4a ON |
1557 | cputime_to_timeval(utime, &r->ru_utime); |
1558 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1559 | |
1560 | if (who != RUSAGE_CHILDREN) { | |
1561 | struct mm_struct *mm = get_task_mm(p); | |
1562 | if (mm) { | |
1563 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1564 | mmput(mm); | |
1565 | } | |
1566 | } | |
1567 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1568 | } |
1569 | ||
1570 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1571 | { | |
1572 | struct rusage r; | |
1da177e4 | 1573 | k_getrusage(p, who, &r); |
1da177e4 LT |
1574 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1575 | } | |
1576 | ||
e48fbb69 | 1577 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1578 | { |
679c9cd4 SK |
1579 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1580 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1581 | return -EINVAL; |
1582 | return getrusage(current, who, ru); | |
1583 | } | |
1584 | ||
e48fbb69 | 1585 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1586 | { |
1587 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1588 | return mask; | |
1589 | } | |
3b7391de | 1590 | |
c4ea37c2 HC |
1591 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1592 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1593 | { |
b6dff3ec DH |
1594 | struct task_struct *me = current; |
1595 | unsigned char comm[sizeof(me->comm)]; | |
1596 | long error; | |
1da177e4 | 1597 | |
d84f4f99 DH |
1598 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1599 | if (error != -ENOSYS) | |
1da177e4 LT |
1600 | return error; |
1601 | ||
d84f4f99 | 1602 | error = 0; |
1da177e4 LT |
1603 | switch (option) { |
1604 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1605 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1606 | error = -EINVAL; |
1607 | break; | |
1608 | } | |
b6dff3ec DH |
1609 | me->pdeath_signal = arg2; |
1610 | error = 0; | |
1da177e4 LT |
1611 | break; |
1612 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1613 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1614 | break; |
1615 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1616 | error = get_dumpable(me->mm); |
1da177e4 LT |
1617 | break; |
1618 | case PR_SET_DUMPABLE: | |
abf75a50 | 1619 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1620 | error = -EINVAL; |
1621 | break; | |
1622 | } | |
b6dff3ec DH |
1623 | set_dumpable(me->mm, arg2); |
1624 | error = 0; | |
1da177e4 LT |
1625 | break; |
1626 | ||
1627 | case PR_SET_UNALIGN: | |
b6dff3ec | 1628 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1629 | break; |
1630 | case PR_GET_UNALIGN: | |
b6dff3ec | 1631 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1632 | break; |
1633 | case PR_SET_FPEMU: | |
b6dff3ec | 1634 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1635 | break; |
1636 | case PR_GET_FPEMU: | |
b6dff3ec | 1637 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1638 | break; |
1639 | case PR_SET_FPEXC: | |
b6dff3ec | 1640 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1641 | break; |
1642 | case PR_GET_FPEXC: | |
b6dff3ec | 1643 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1644 | break; |
1645 | case PR_GET_TIMING: | |
1646 | error = PR_TIMING_STATISTICAL; | |
1647 | break; | |
1648 | case PR_SET_TIMING: | |
7b26655f | 1649 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1650 | error = -EINVAL; |
b6dff3ec DH |
1651 | else |
1652 | error = 0; | |
1da177e4 LT |
1653 | break; |
1654 | ||
b6dff3ec DH |
1655 | case PR_SET_NAME: |
1656 | comm[sizeof(me->comm)-1] = 0; | |
1657 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1658 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1659 | return -EFAULT; |
b6dff3ec | 1660 | set_task_comm(me, comm); |
1da177e4 | 1661 | return 0; |
b6dff3ec DH |
1662 | case PR_GET_NAME: |
1663 | get_task_comm(comm, me); | |
1664 | if (copy_to_user((char __user *)arg2, comm, | |
1665 | sizeof(comm))) | |
1da177e4 LT |
1666 | return -EFAULT; |
1667 | return 0; | |
651d765d | 1668 | case PR_GET_ENDIAN: |
b6dff3ec | 1669 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1670 | break; |
1671 | case PR_SET_ENDIAN: | |
b6dff3ec | 1672 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1673 | break; |
1674 | ||
1d9d02fe AA |
1675 | case PR_GET_SECCOMP: |
1676 | error = prctl_get_seccomp(); | |
1677 | break; | |
1678 | case PR_SET_SECCOMP: | |
1679 | error = prctl_set_seccomp(arg2); | |
1680 | break; | |
8fb402bc EB |
1681 | case PR_GET_TSC: |
1682 | error = GET_TSC_CTL(arg2); | |
1683 | break; | |
1684 | case PR_SET_TSC: | |
1685 | error = SET_TSC_CTL(arg2); | |
1686 | break; | |
cdd6c482 IM |
1687 | case PR_TASK_PERF_EVENTS_DISABLE: |
1688 | error = perf_event_task_disable(); | |
1d1c7ddb | 1689 | break; |
cdd6c482 IM |
1690 | case PR_TASK_PERF_EVENTS_ENABLE: |
1691 | error = perf_event_task_enable(); | |
1d1c7ddb | 1692 | break; |
6976675d AV |
1693 | case PR_GET_TIMERSLACK: |
1694 | error = current->timer_slack_ns; | |
1695 | break; | |
1696 | case PR_SET_TIMERSLACK: | |
1697 | if (arg2 <= 0) | |
1698 | current->timer_slack_ns = | |
1699 | current->default_timer_slack_ns; | |
1700 | else | |
1701 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1702 | error = 0; |
6976675d | 1703 | break; |
4db96cf0 AK |
1704 | case PR_MCE_KILL: |
1705 | if (arg4 | arg5) | |
1706 | return -EINVAL; | |
1707 | switch (arg2) { | |
1087e9b4 | 1708 | case PR_MCE_KILL_CLEAR: |
4db96cf0 AK |
1709 | if (arg3 != 0) |
1710 | return -EINVAL; | |
1711 | current->flags &= ~PF_MCE_PROCESS; | |
1712 | break; | |
1087e9b4 | 1713 | case PR_MCE_KILL_SET: |
4db96cf0 | 1714 | current->flags |= PF_MCE_PROCESS; |
1087e9b4 | 1715 | if (arg3 == PR_MCE_KILL_EARLY) |
4db96cf0 | 1716 | current->flags |= PF_MCE_EARLY; |
1087e9b4 | 1717 | else if (arg3 == PR_MCE_KILL_LATE) |
4db96cf0 | 1718 | current->flags &= ~PF_MCE_EARLY; |
1087e9b4 AK |
1719 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
1720 | current->flags &= | |
1721 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1722 | else | |
1723 | return -EINVAL; | |
4db96cf0 AK |
1724 | break; |
1725 | default: | |
1726 | return -EINVAL; | |
1727 | } | |
1728 | error = 0; | |
1729 | break; | |
1087e9b4 AK |
1730 | case PR_MCE_KILL_GET: |
1731 | if (arg2 | arg3 | arg4 | arg5) | |
1732 | return -EINVAL; | |
1733 | if (current->flags & PF_MCE_PROCESS) | |
1734 | error = (current->flags & PF_MCE_EARLY) ? | |
1735 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1736 | else | |
1737 | error = PR_MCE_KILL_DEFAULT; | |
1738 | break; | |
1da177e4 LT |
1739 | default: |
1740 | error = -EINVAL; | |
1741 | break; | |
1742 | } | |
1743 | return error; | |
1744 | } | |
3cfc348b | 1745 | |
836f92ad HC |
1746 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
1747 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
1748 | { |
1749 | int err = 0; | |
1750 | int cpu = raw_smp_processor_id(); | |
1751 | if (cpup) | |
1752 | err |= put_user(cpu, cpup); | |
1753 | if (nodep) | |
1754 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1755 | return err ? -EFAULT : 0; |
1756 | } | |
10a0a8d4 JF |
1757 | |
1758 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1759 | ||
a06a4dc3 | 1760 | static void argv_cleanup(struct subprocess_info *info) |
10a0a8d4 | 1761 | { |
a06a4dc3 | 1762 | argv_free(info->argv); |
10a0a8d4 JF |
1763 | } |
1764 | ||
1765 | /** | |
1766 | * orderly_poweroff - Trigger an orderly system poweroff | |
1767 | * @force: force poweroff if command execution fails | |
1768 | * | |
1769 | * This may be called from any context to trigger a system shutdown. | |
1770 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1771 | */ | |
1772 | int orderly_poweroff(bool force) | |
1773 | { | |
1774 | int argc; | |
1775 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1776 | static char *envp[] = { | |
1777 | "HOME=/", | |
1778 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1779 | NULL | |
1780 | }; | |
1781 | int ret = -ENOMEM; | |
1782 | struct subprocess_info *info; | |
1783 | ||
1784 | if (argv == NULL) { | |
1785 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1786 | __func__, poweroff_cmd); | |
1787 | goto out; | |
1788 | } | |
1789 | ||
ac331d15 | 1790 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1791 | if (info == NULL) { |
1792 | argv_free(argv); | |
1793 | goto out; | |
1794 | } | |
1795 | ||
a06a4dc3 | 1796 | call_usermodehelper_setfns(info, NULL, argv_cleanup, NULL); |
10a0a8d4 | 1797 | |
86313c48 | 1798 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1799 | |
1800 | out: | |
1801 | if (ret && force) { | |
1802 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1803 | "forcing the issue\n"); | |
1804 | ||
1805 | /* I guess this should try to kick off some daemon to | |
1806 | sync and poweroff asap. Or not even bother syncing | |
1807 | if we're doing an emergency shutdown? */ | |
1808 | emergency_sync(); | |
1809 | kernel_power_off(); | |
1810 | } | |
1811 | ||
1812 | return ret; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(orderly_poweroff); |