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> | |
11 | #include <linux/smp_lock.h> | |
12 | #include <linux/notifier.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/prctl.h> | |
1da177e4 LT |
15 | #include <linux/highuid.h> |
16 | #include <linux/fs.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> |
1da177e4 LT |
36 | |
37 | #include <linux/compat.h> | |
38 | #include <linux/syscalls.h> | |
00d7c05a | 39 | #include <linux/kprobes.h> |
acce292c | 40 | #include <linux/user_namespace.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/io.h> | |
44 | #include <asm/unistd.h> | |
45 | ||
46 | #ifndef SET_UNALIGN_CTL | |
47 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
48 | #endif | |
49 | #ifndef GET_UNALIGN_CTL | |
50 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
51 | #endif | |
52 | #ifndef SET_FPEMU_CTL | |
53 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
54 | #endif | |
55 | #ifndef GET_FPEMU_CTL | |
56 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
57 | #endif | |
58 | #ifndef SET_FPEXC_CTL | |
59 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
60 | #endif | |
61 | #ifndef GET_FPEXC_CTL | |
62 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
63 | #endif | |
651d765d AB |
64 | #ifndef GET_ENDIAN |
65 | # define GET_ENDIAN(a,b) (-EINVAL) | |
66 | #endif | |
67 | #ifndef SET_ENDIAN | |
68 | # define SET_ENDIAN(a,b) (-EINVAL) | |
69 | #endif | |
8fb402bc EB |
70 | #ifndef GET_TSC_CTL |
71 | # define GET_TSC_CTL(a) (-EINVAL) | |
72 | #endif | |
73 | #ifndef SET_TSC_CTL | |
74 | # define SET_TSC_CTL(a) (-EINVAL) | |
75 | #endif | |
1da177e4 LT |
76 | |
77 | /* | |
78 | * this is where the system-wide overflow UID and GID are defined, for | |
79 | * architectures that now have 32-bit UID/GID but didn't in the past | |
80 | */ | |
81 | ||
82 | int overflowuid = DEFAULT_OVERFLOWUID; | |
83 | int overflowgid = DEFAULT_OVERFLOWGID; | |
84 | ||
85 | #ifdef CONFIG_UID16 | |
86 | EXPORT_SYMBOL(overflowuid); | |
87 | EXPORT_SYMBOL(overflowgid); | |
88 | #endif | |
89 | ||
90 | /* | |
91 | * the same as above, but for filesystems which can only store a 16-bit | |
92 | * UID and GID. as such, this is needed on all architectures | |
93 | */ | |
94 | ||
95 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
96 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
97 | ||
98 | EXPORT_SYMBOL(fs_overflowuid); | |
99 | EXPORT_SYMBOL(fs_overflowgid); | |
100 | ||
101 | /* | |
102 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes | |
103 | */ | |
104 | ||
105 | int C_A_D = 1; | |
9ec52099 CLG |
106 | struct pid *cad_pid; |
107 | EXPORT_SYMBOL(cad_pid); | |
1da177e4 | 108 | |
bd804eba RW |
109 | /* |
110 | * If set, this is used for preparing the system to power off. | |
111 | */ | |
112 | ||
113 | void (*pm_power_off_prepare)(void); | |
bd804eba | 114 | |
1da177e4 LT |
115 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
116 | { | |
76aac0e9 | 117 | uid_t euid = current_euid(); |
1da177e4 LT |
118 | int no_nice; |
119 | ||
b6dff3ec DH |
120 | if (p->cred->uid != euid && |
121 | p->cred->euid != euid && | |
122 | !capable(CAP_SYS_NICE)) { | |
1da177e4 LT |
123 | error = -EPERM; |
124 | goto out; | |
125 | } | |
e43379f1 | 126 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
127 | error = -EACCES; |
128 | goto out; | |
129 | } | |
130 | no_nice = security_task_setnice(p, niceval); | |
131 | if (no_nice) { | |
132 | error = no_nice; | |
133 | goto out; | |
134 | } | |
135 | if (error == -ESRCH) | |
136 | error = 0; | |
137 | set_user_nice(p, niceval); | |
138 | out: | |
139 | return error; | |
140 | } | |
141 | ||
142 | asmlinkage long sys_setpriority(int which, int who, int niceval) | |
143 | { | |
144 | struct task_struct *g, *p; | |
145 | struct user_struct *user; | |
86a264ab | 146 | const struct cred *cred = current_cred(); |
1da177e4 | 147 | int error = -EINVAL; |
41487c65 | 148 | struct pid *pgrp; |
1da177e4 | 149 | |
3e88c553 | 150 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
151 | goto out; |
152 | ||
153 | /* normalize: avoid signed division (rounding problems) */ | |
154 | error = -ESRCH; | |
155 | if (niceval < -20) | |
156 | niceval = -20; | |
157 | if (niceval > 19) | |
158 | niceval = 19; | |
159 | ||
160 | read_lock(&tasklist_lock); | |
161 | switch (which) { | |
162 | case PRIO_PROCESS: | |
41487c65 | 163 | if (who) |
228ebcbe | 164 | p = find_task_by_vpid(who); |
41487c65 EB |
165 | else |
166 | p = current; | |
1da177e4 LT |
167 | if (p) |
168 | error = set_one_prio(p, niceval, error); | |
169 | break; | |
170 | case PRIO_PGRP: | |
41487c65 | 171 | if (who) |
b488893a | 172 | pgrp = find_vpid(who); |
41487c65 EB |
173 | else |
174 | pgrp = task_pgrp(current); | |
2d70b68d | 175 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 176 | error = set_one_prio(p, niceval, error); |
2d70b68d | 177 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
178 | break; |
179 | case PRIO_USER: | |
86a264ab | 180 | user = cred->user; |
1da177e4 | 181 | if (!who) |
86a264ab DH |
182 | who = cred->uid; |
183 | else if ((who != cred->uid) && | |
184 | !(user = find_user(who))) | |
185 | goto out_unlock; /* No processes for this user */ | |
1da177e4 LT |
186 | |
187 | do_each_thread(g, p) | |
86a264ab | 188 | if (__task_cred(p)->uid == who) |
1da177e4 LT |
189 | error = set_one_prio(p, niceval, error); |
190 | while_each_thread(g, p); | |
86a264ab | 191 | if (who != cred->uid) |
1da177e4 LT |
192 | free_uid(user); /* For find_user() */ |
193 | break; | |
194 | } | |
195 | out_unlock: | |
196 | read_unlock(&tasklist_lock); | |
197 | out: | |
198 | return error; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Ugh. To avoid negative return values, "getpriority()" will | |
203 | * not return the normal nice-value, but a negated value that | |
204 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
205 | * to stay compatible. | |
206 | */ | |
207 | asmlinkage long sys_getpriority(int which, int who) | |
208 | { | |
209 | struct task_struct *g, *p; | |
210 | struct user_struct *user; | |
86a264ab | 211 | const struct cred *cred = current_cred(); |
1da177e4 | 212 | long niceval, retval = -ESRCH; |
41487c65 | 213 | struct pid *pgrp; |
1da177e4 | 214 | |
3e88c553 | 215 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
216 | return -EINVAL; |
217 | ||
218 | read_lock(&tasklist_lock); | |
219 | switch (which) { | |
220 | case PRIO_PROCESS: | |
41487c65 | 221 | if (who) |
228ebcbe | 222 | p = find_task_by_vpid(who); |
41487c65 EB |
223 | else |
224 | p = current; | |
1da177e4 LT |
225 | if (p) { |
226 | niceval = 20 - task_nice(p); | |
227 | if (niceval > retval) | |
228 | retval = niceval; | |
229 | } | |
230 | break; | |
231 | case PRIO_PGRP: | |
41487c65 | 232 | if (who) |
b488893a | 233 | pgrp = find_vpid(who); |
41487c65 EB |
234 | else |
235 | pgrp = task_pgrp(current); | |
2d70b68d | 236 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
237 | niceval = 20 - task_nice(p); |
238 | if (niceval > retval) | |
239 | retval = niceval; | |
2d70b68d | 240 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
241 | break; |
242 | case PRIO_USER: | |
86a264ab | 243 | user = (struct user_struct *) cred->user; |
1da177e4 | 244 | if (!who) |
86a264ab DH |
245 | who = cred->uid; |
246 | else if ((who != cred->uid) && | |
247 | !(user = find_user(who))) | |
248 | goto out_unlock; /* No processes for this user */ | |
1da177e4 LT |
249 | |
250 | do_each_thread(g, p) | |
86a264ab | 251 | if (__task_cred(p)->uid == who) { |
1da177e4 LT |
252 | niceval = 20 - task_nice(p); |
253 | if (niceval > retval) | |
254 | retval = niceval; | |
255 | } | |
256 | while_each_thread(g, p); | |
86a264ab | 257 | if (who != cred->uid) |
1da177e4 LT |
258 | free_uid(user); /* for find_user() */ |
259 | break; | |
260 | } | |
261 | out_unlock: | |
262 | read_unlock(&tasklist_lock); | |
263 | ||
264 | return retval; | |
265 | } | |
266 | ||
e4c94330 EB |
267 | /** |
268 | * emergency_restart - reboot the system | |
269 | * | |
270 | * Without shutting down any hardware or taking any locks | |
271 | * reboot the system. This is called when we know we are in | |
272 | * trouble so this is our best effort to reboot. This is | |
273 | * safe to call in interrupt context. | |
274 | */ | |
7c903473 EB |
275 | void emergency_restart(void) |
276 | { | |
277 | machine_emergency_restart(); | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(emergency_restart); | |
280 | ||
ca195b7f | 281 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 282 | { |
e041c683 | 283 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 284 | system_state = SYSTEM_RESTART; |
4a00ea1e | 285 | device_shutdown(); |
58b3b71d | 286 | sysdev_shutdown(); |
e4c94330 | 287 | } |
1e5d5331 RD |
288 | |
289 | /** | |
290 | * kernel_restart - reboot the system | |
291 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 292 | * or %NULL |
1e5d5331 RD |
293 | * |
294 | * Shutdown everything and perform a clean reboot. | |
295 | * This is not safe to call in interrupt context. | |
296 | */ | |
e4c94330 EB |
297 | void kernel_restart(char *cmd) |
298 | { | |
299 | kernel_restart_prepare(cmd); | |
756184b7 | 300 | if (!cmd) |
4a00ea1e | 301 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 302 | else |
4a00ea1e | 303 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
304 | machine_restart(cmd); |
305 | } | |
306 | EXPORT_SYMBOL_GPL(kernel_restart); | |
307 | ||
4ef7229f | 308 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 309 | { |
e041c683 | 310 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
311 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
312 | system_state = state; | |
313 | device_shutdown(); | |
314 | } | |
e4c94330 EB |
315 | /** |
316 | * kernel_halt - halt the system | |
317 | * | |
318 | * Shutdown everything and perform a clean system halt. | |
319 | */ | |
e4c94330 EB |
320 | void kernel_halt(void) |
321 | { | |
729b4d4c | 322 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 323 | sysdev_shutdown(); |
4a00ea1e EB |
324 | printk(KERN_EMERG "System halted.\n"); |
325 | machine_halt(); | |
326 | } | |
729b4d4c | 327 | |
4a00ea1e EB |
328 | EXPORT_SYMBOL_GPL(kernel_halt); |
329 | ||
e4c94330 EB |
330 | /** |
331 | * kernel_power_off - power_off the system | |
332 | * | |
333 | * Shutdown everything and perform a clean system power_off. | |
334 | */ | |
e4c94330 EB |
335 | void kernel_power_off(void) |
336 | { | |
729b4d4c | 337 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
338 | if (pm_power_off_prepare) |
339 | pm_power_off_prepare(); | |
4047727e | 340 | disable_nonboot_cpus(); |
58b3b71d | 341 | sysdev_shutdown(); |
4a00ea1e EB |
342 | printk(KERN_EMERG "Power down.\n"); |
343 | machine_power_off(); | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
1da177e4 LT |
346 | /* |
347 | * Reboot system call: for obvious reasons only root may call it, | |
348 | * and even root needs to set up some magic numbers in the registers | |
349 | * so that some mistake won't make this reboot the whole machine. | |
350 | * You can also set the meaning of the ctrl-alt-del-key here. | |
351 | * | |
352 | * reboot doesn't sync: do that yourself before calling this. | |
353 | */ | |
354 | asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) | |
355 | { | |
356 | char buffer[256]; | |
357 | ||
358 | /* We only trust the superuser with rebooting the system. */ | |
359 | if (!capable(CAP_SYS_BOOT)) | |
360 | return -EPERM; | |
361 | ||
362 | /* For safety, we require "magic" arguments. */ | |
363 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
364 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
365 | magic2 != LINUX_REBOOT_MAGIC2A && | |
366 | magic2 != LINUX_REBOOT_MAGIC2B && | |
367 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
368 | return -EINVAL; | |
369 | ||
5e38291d EB |
370 | /* Instead of trying to make the power_off code look like |
371 | * halt when pm_power_off is not set do it the easy way. | |
372 | */ | |
373 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
374 | cmd = LINUX_REBOOT_CMD_HALT; | |
375 | ||
1da177e4 LT |
376 | lock_kernel(); |
377 | switch (cmd) { | |
378 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 379 | kernel_restart(NULL); |
1da177e4 LT |
380 | break; |
381 | ||
382 | case LINUX_REBOOT_CMD_CAD_ON: | |
383 | C_A_D = 1; | |
384 | break; | |
385 | ||
386 | case LINUX_REBOOT_CMD_CAD_OFF: | |
387 | C_A_D = 0; | |
388 | break; | |
389 | ||
390 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 391 | kernel_halt(); |
1da177e4 LT |
392 | unlock_kernel(); |
393 | do_exit(0); | |
394 | break; | |
395 | ||
396 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 397 | kernel_power_off(); |
1da177e4 LT |
398 | unlock_kernel(); |
399 | do_exit(0); | |
400 | break; | |
401 | ||
402 | case LINUX_REBOOT_CMD_RESTART2: | |
403 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
404 | unlock_kernel(); | |
405 | return -EFAULT; | |
406 | } | |
407 | buffer[sizeof(buffer) - 1] = '\0'; | |
408 | ||
4a00ea1e | 409 | kernel_restart(buffer); |
1da177e4 LT |
410 | break; |
411 | ||
3ab83521 | 412 | #ifdef CONFIG_KEXEC |
dc009d92 | 413 | case LINUX_REBOOT_CMD_KEXEC: |
3ab83521 HY |
414 | { |
415 | int ret; | |
416 | ret = kernel_kexec(); | |
417 | unlock_kernel(); | |
418 | return ret; | |
419 | } | |
420 | #endif | |
4a00ea1e | 421 | |
b0cb1a19 | 422 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
423 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
424 | { | |
a3d25c27 | 425 | int ret = hibernate(); |
1da177e4 LT |
426 | unlock_kernel(); |
427 | return ret; | |
428 | } | |
429 | #endif | |
430 | ||
431 | default: | |
432 | unlock_kernel(); | |
433 | return -EINVAL; | |
434 | } | |
435 | unlock_kernel(); | |
436 | return 0; | |
437 | } | |
438 | ||
65f27f38 | 439 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 440 | { |
abcd9e51 | 441 | kernel_restart(NULL); |
1da177e4 LT |
442 | } |
443 | ||
444 | /* | |
445 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
446 | * As it's called within an interrupt, it may NOT sync: the only choice | |
447 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
448 | */ | |
449 | void ctrl_alt_del(void) | |
450 | { | |
65f27f38 | 451 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
452 | |
453 | if (C_A_D) | |
454 | schedule_work(&cad_work); | |
455 | else | |
9ec52099 | 456 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
457 | } |
458 | ||
1da177e4 LT |
459 | /* |
460 | * Unprivileged users may change the real gid to the effective gid | |
461 | * or vice versa. (BSD-style) | |
462 | * | |
463 | * If you set the real gid at all, or set the effective gid to a value not | |
464 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
465 | * | |
466 | * This makes it possible for a setgid program to completely drop its | |
467 | * privileges, which is often a useful assertion to make when you are doing | |
468 | * a security audit over a program. | |
469 | * | |
470 | * The general idea is that a program which uses just setregid() will be | |
471 | * 100% compatible with BSD. A program which uses just setgid() will be | |
472 | * 100% compatible with POSIX with saved IDs. | |
473 | * | |
474 | * SMP: There are not races, the GIDs are checked only by filesystem | |
475 | * operations (as far as semantic preservation is concerned). | |
476 | */ | |
477 | asmlinkage long sys_setregid(gid_t rgid, gid_t egid) | |
478 | { | |
b6dff3ec DH |
479 | struct cred *cred = current->cred; |
480 | int old_rgid = cred->gid; | |
481 | int old_egid = cred->egid; | |
1da177e4 LT |
482 | int new_rgid = old_rgid; |
483 | int new_egid = old_egid; | |
484 | int retval; | |
485 | ||
486 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); | |
487 | if (retval) | |
488 | return retval; | |
489 | ||
490 | if (rgid != (gid_t) -1) { | |
491 | if ((old_rgid == rgid) || | |
b6dff3ec | 492 | (cred->egid == rgid) || |
1da177e4 LT |
493 | capable(CAP_SETGID)) |
494 | new_rgid = rgid; | |
495 | else | |
496 | return -EPERM; | |
497 | } | |
498 | if (egid != (gid_t) -1) { | |
499 | if ((old_rgid == egid) || | |
b6dff3ec DH |
500 | (cred->egid == egid) || |
501 | (cred->sgid == egid) || | |
1da177e4 LT |
502 | capable(CAP_SETGID)) |
503 | new_egid = egid; | |
756184b7 | 504 | else |
1da177e4 | 505 | return -EPERM; |
1da177e4 | 506 | } |
756184b7 | 507 | if (new_egid != old_egid) { |
6c5d5238 | 508 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 509 | smp_wmb(); |
1da177e4 LT |
510 | } |
511 | if (rgid != (gid_t) -1 || | |
512 | (egid != (gid_t) -1 && egid != old_rgid)) | |
b6dff3ec DH |
513 | cred->sgid = new_egid; |
514 | cred->fsgid = new_egid; | |
515 | cred->egid = new_egid; | |
516 | cred->gid = new_rgid; | |
1da177e4 | 517 | key_fsgid_changed(current); |
9f46080c | 518 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
519 | return 0; |
520 | } | |
521 | ||
522 | /* | |
523 | * setgid() is implemented like SysV w/ SAVED_IDS | |
524 | * | |
525 | * SMP: Same implicit races as above. | |
526 | */ | |
527 | asmlinkage long sys_setgid(gid_t gid) | |
528 | { | |
b6dff3ec DH |
529 | struct cred *cred = current->cred; |
530 | int old_egid = cred->egid; | |
1da177e4 LT |
531 | int retval; |
532 | ||
533 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); | |
534 | if (retval) | |
535 | return retval; | |
536 | ||
756184b7 CP |
537 | if (capable(CAP_SETGID)) { |
538 | if (old_egid != gid) { | |
6c5d5238 | 539 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 540 | smp_wmb(); |
1da177e4 | 541 | } |
b6dff3ec DH |
542 | cred->gid = cred->egid = cred->sgid = cred->fsgid = gid; |
543 | } else if ((gid == cred->gid) || (gid == cred->sgid)) { | |
756184b7 | 544 | if (old_egid != gid) { |
6c5d5238 | 545 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 546 | smp_wmb(); |
1da177e4 | 547 | } |
b6dff3ec | 548 | cred->egid = cred->fsgid = gid; |
1da177e4 LT |
549 | } |
550 | else | |
551 | return -EPERM; | |
552 | ||
553 | key_fsgid_changed(current); | |
9f46080c | 554 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
555 | return 0; |
556 | } | |
557 | ||
558 | static int set_user(uid_t new_ruid, int dumpclear) | |
559 | { | |
560 | struct user_struct *new_user; | |
561 | ||
acce292c | 562 | new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); |
1da177e4 LT |
563 | if (!new_user) |
564 | return -EAGAIN; | |
565 | ||
566 | if (atomic_read(&new_user->processes) >= | |
567 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
acce292c | 568 | new_user != current->nsproxy->user_ns->root_user) { |
1da177e4 LT |
569 | free_uid(new_user); |
570 | return -EAGAIN; | |
571 | } | |
572 | ||
573 | switch_uid(new_user); | |
574 | ||
756184b7 | 575 | if (dumpclear) { |
6c5d5238 | 576 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 577 | smp_wmb(); |
1da177e4 | 578 | } |
b6dff3ec | 579 | current->cred->uid = new_ruid; |
1da177e4 LT |
580 | return 0; |
581 | } | |
582 | ||
583 | /* | |
584 | * Unprivileged users may change the real uid to the effective uid | |
585 | * or vice versa. (BSD-style) | |
586 | * | |
587 | * If you set the real uid at all, or set the effective uid to a value not | |
588 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
589 | * | |
590 | * This makes it possible for a setuid program to completely drop its | |
591 | * privileges, which is often a useful assertion to make when you are doing | |
592 | * a security audit over a program. | |
593 | * | |
594 | * The general idea is that a program which uses just setreuid() will be | |
595 | * 100% compatible with BSD. A program which uses just setuid() will be | |
596 | * 100% compatible with POSIX with saved IDs. | |
597 | */ | |
598 | asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) | |
599 | { | |
b6dff3ec | 600 | struct cred *cred = current->cred; |
1da177e4 LT |
601 | int old_ruid, old_euid, old_suid, new_ruid, new_euid; |
602 | int retval; | |
603 | ||
604 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); | |
605 | if (retval) | |
606 | return retval; | |
607 | ||
b6dff3ec DH |
608 | new_ruid = old_ruid = cred->uid; |
609 | new_euid = old_euid = cred->euid; | |
610 | old_suid = cred->suid; | |
1da177e4 LT |
611 | |
612 | if (ruid != (uid_t) -1) { | |
613 | new_ruid = ruid; | |
614 | if ((old_ruid != ruid) && | |
b6dff3ec | 615 | (cred->euid != ruid) && |
1da177e4 LT |
616 | !capable(CAP_SETUID)) |
617 | return -EPERM; | |
618 | } | |
619 | ||
620 | if (euid != (uid_t) -1) { | |
621 | new_euid = euid; | |
622 | if ((old_ruid != euid) && | |
b6dff3ec DH |
623 | (cred->euid != euid) && |
624 | (cred->suid != euid) && | |
1da177e4 LT |
625 | !capable(CAP_SETUID)) |
626 | return -EPERM; | |
627 | } | |
628 | ||
629 | if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) | |
630 | return -EAGAIN; | |
631 | ||
756184b7 | 632 | if (new_euid != old_euid) { |
6c5d5238 | 633 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 634 | smp_wmb(); |
1da177e4 | 635 | } |
b6dff3ec | 636 | cred->fsuid = cred->euid = new_euid; |
1da177e4 LT |
637 | if (ruid != (uid_t) -1 || |
638 | (euid != (uid_t) -1 && euid != old_ruid)) | |
b6dff3ec DH |
639 | cred->suid = cred->euid; |
640 | cred->fsuid = cred->euid; | |
1da177e4 LT |
641 | |
642 | key_fsuid_changed(current); | |
9f46080c | 643 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
644 | |
645 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); | |
646 | } | |
647 | ||
648 | ||
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 | */ | |
661 | asmlinkage long sys_setuid(uid_t uid) | |
662 | { | |
b6dff3ec DH |
663 | struct cred *cred = current->cred; |
664 | int old_euid = cred->euid; | |
a09c17a6 | 665 | int old_ruid, old_suid, new_suid; |
1da177e4 LT |
666 | int retval; |
667 | ||
668 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); | |
669 | if (retval) | |
670 | return retval; | |
671 | ||
b6dff3ec DH |
672 | old_ruid = cred->uid; |
673 | old_suid = cred->suid; | |
1da177e4 LT |
674 | new_suid = old_suid; |
675 | ||
676 | if (capable(CAP_SETUID)) { | |
677 | if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) | |
678 | return -EAGAIN; | |
679 | new_suid = uid; | |
b6dff3ec | 680 | } else if ((uid != cred->uid) && (uid != new_suid)) |
1da177e4 LT |
681 | return -EPERM; |
682 | ||
756184b7 | 683 | if (old_euid != uid) { |
6c5d5238 | 684 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 685 | smp_wmb(); |
1da177e4 | 686 | } |
b6dff3ec DH |
687 | cred->fsuid = cred->euid = uid; |
688 | cred->suid = new_suid; | |
1da177e4 LT |
689 | |
690 | key_fsuid_changed(current); | |
9f46080c | 691 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
692 | |
693 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); | |
694 | } | |
695 | ||
696 | ||
697 | /* | |
698 | * This function implements a generic ability to update ruid, euid, | |
699 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
700 | */ | |
701 | asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) | |
702 | { | |
b6dff3ec DH |
703 | struct cred *cred = current->cred; |
704 | int old_ruid = cred->uid; | |
705 | int old_euid = cred->euid; | |
706 | int old_suid = cred->suid; | |
1da177e4 LT |
707 | int retval; |
708 | ||
709 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); | |
710 | if (retval) | |
711 | return retval; | |
712 | ||
713 | if (!capable(CAP_SETUID)) { | |
b6dff3ec DH |
714 | if ((ruid != (uid_t) -1) && (ruid != cred->uid) && |
715 | (ruid != cred->euid) && (ruid != cred->suid)) | |
1da177e4 | 716 | return -EPERM; |
b6dff3ec DH |
717 | if ((euid != (uid_t) -1) && (euid != cred->uid) && |
718 | (euid != cred->euid) && (euid != cred->suid)) | |
1da177e4 | 719 | return -EPERM; |
b6dff3ec DH |
720 | if ((suid != (uid_t) -1) && (suid != cred->uid) && |
721 | (suid != cred->euid) && (suid != cred->suid)) | |
1da177e4 LT |
722 | return -EPERM; |
723 | } | |
724 | if (ruid != (uid_t) -1) { | |
b6dff3ec DH |
725 | if (ruid != cred->uid && |
726 | set_user(ruid, euid != cred->euid) < 0) | |
1da177e4 LT |
727 | return -EAGAIN; |
728 | } | |
729 | if (euid != (uid_t) -1) { | |
b6dff3ec | 730 | if (euid != cred->euid) { |
6c5d5238 | 731 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 732 | smp_wmb(); |
1da177e4 | 733 | } |
b6dff3ec | 734 | cred->euid = euid; |
1da177e4 | 735 | } |
b6dff3ec | 736 | cred->fsuid = cred->euid; |
1da177e4 | 737 | if (suid != (uid_t) -1) |
b6dff3ec | 738 | cred->suid = suid; |
1da177e4 LT |
739 | |
740 | key_fsuid_changed(current); | |
9f46080c | 741 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
742 | |
743 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); | |
744 | } | |
745 | ||
746 | asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) | |
747 | { | |
86a264ab | 748 | const struct cred *cred = current_cred(); |
1da177e4 LT |
749 | int retval; |
750 | ||
86a264ab DH |
751 | if (!(retval = put_user(cred->uid, ruid)) && |
752 | !(retval = put_user(cred->euid, euid))) | |
b6dff3ec | 753 | retval = put_user(cred->suid, suid); |
1da177e4 LT |
754 | |
755 | return retval; | |
756 | } | |
757 | ||
758 | /* | |
759 | * Same as above, but for rgid, egid, sgid. | |
760 | */ | |
761 | asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) | |
762 | { | |
b6dff3ec | 763 | struct cred *cred = current->cred; |
1da177e4 LT |
764 | int retval; |
765 | ||
766 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); | |
767 | if (retval) | |
768 | return retval; | |
769 | ||
770 | if (!capable(CAP_SETGID)) { | |
b6dff3ec DH |
771 | if ((rgid != (gid_t) -1) && (rgid != cred->gid) && |
772 | (rgid != cred->egid) && (rgid != cred->sgid)) | |
1da177e4 | 773 | return -EPERM; |
b6dff3ec DH |
774 | if ((egid != (gid_t) -1) && (egid != cred->gid) && |
775 | (egid != cred->egid) && (egid != cred->sgid)) | |
1da177e4 | 776 | return -EPERM; |
b6dff3ec DH |
777 | if ((sgid != (gid_t) -1) && (sgid != cred->gid) && |
778 | (sgid != cred->egid) && (sgid != cred->sgid)) | |
1da177e4 LT |
779 | return -EPERM; |
780 | } | |
781 | if (egid != (gid_t) -1) { | |
b6dff3ec | 782 | if (egid != cred->egid) { |
6c5d5238 | 783 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 784 | smp_wmb(); |
1da177e4 | 785 | } |
b6dff3ec | 786 | cred->egid = egid; |
1da177e4 | 787 | } |
b6dff3ec | 788 | cred->fsgid = cred->egid; |
1da177e4 | 789 | if (rgid != (gid_t) -1) |
b6dff3ec | 790 | cred->gid = rgid; |
1da177e4 | 791 | if (sgid != (gid_t) -1) |
b6dff3ec | 792 | cred->sgid = sgid; |
1da177e4 LT |
793 | |
794 | key_fsgid_changed(current); | |
9f46080c | 795 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
796 | return 0; |
797 | } | |
798 | ||
799 | asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) | |
800 | { | |
86a264ab | 801 | const struct cred *cred = current_cred(); |
1da177e4 LT |
802 | int retval; |
803 | ||
86a264ab DH |
804 | if (!(retval = put_user(cred->gid, rgid)) && |
805 | !(retval = put_user(cred->egid, egid))) | |
b6dff3ec | 806 | retval = put_user(cred->sgid, sgid); |
1da177e4 LT |
807 | |
808 | return retval; | |
809 | } | |
810 | ||
811 | ||
812 | /* | |
813 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
814 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
815 | * whatever uid it wants to). It normally shadows "euid", except when | |
816 | * explicitly set by setfsuid() or for access.. | |
817 | */ | |
818 | asmlinkage long sys_setfsuid(uid_t uid) | |
819 | { | |
b6dff3ec | 820 | struct cred *cred = current->cred; |
1da177e4 LT |
821 | int old_fsuid; |
822 | ||
b6dff3ec | 823 | old_fsuid = cred->fsuid; |
1da177e4 LT |
824 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) |
825 | return old_fsuid; | |
826 | ||
b6dff3ec DH |
827 | if (uid == cred->uid || uid == cred->euid || |
828 | uid == cred->suid || uid == cred->fsuid || | |
756184b7 CP |
829 | capable(CAP_SETUID)) { |
830 | if (uid != old_fsuid) { | |
6c5d5238 | 831 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 832 | smp_wmb(); |
1da177e4 | 833 | } |
b6dff3ec | 834 | cred->fsuid = uid; |
1da177e4 LT |
835 | } |
836 | ||
837 | key_fsuid_changed(current); | |
9f46080c | 838 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
839 | |
840 | security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); | |
841 | ||
842 | return old_fsuid; | |
843 | } | |
844 | ||
845 | /* | |
f42df9e6 | 846 | * Samma på svenska.. |
1da177e4 LT |
847 | */ |
848 | asmlinkage long sys_setfsgid(gid_t gid) | |
849 | { | |
b6dff3ec | 850 | struct cred *cred = current->cred; |
1da177e4 LT |
851 | int old_fsgid; |
852 | ||
b6dff3ec | 853 | old_fsgid = cred->fsgid; |
1da177e4 LT |
854 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
855 | return old_fsgid; | |
856 | ||
b6dff3ec DH |
857 | if (gid == cred->gid || gid == cred->egid || |
858 | gid == cred->sgid || gid == cred->fsgid || | |
756184b7 CP |
859 | capable(CAP_SETGID)) { |
860 | if (gid != old_fsgid) { | |
6c5d5238 | 861 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 862 | smp_wmb(); |
1da177e4 | 863 | } |
b6dff3ec | 864 | cred->fsgid = gid; |
1da177e4 | 865 | key_fsgid_changed(current); |
9f46080c | 866 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
867 | } |
868 | return old_fsgid; | |
869 | } | |
870 | ||
f06febc9 FM |
871 | void do_sys_times(struct tms *tms) |
872 | { | |
873 | struct task_cputime cputime; | |
874 | cputime_t cutime, cstime; | |
875 | ||
876 | spin_lock_irq(¤t->sighand->siglock); | |
877 | thread_group_cputime(current, &cputime); | |
878 | cutime = current->signal->cutime; | |
879 | cstime = current->signal->cstime; | |
880 | spin_unlock_irq(¤t->sighand->siglock); | |
881 | tms->tms_utime = cputime_to_clock_t(cputime.utime); | |
882 | tms->tms_stime = cputime_to_clock_t(cputime.stime); | |
883 | tms->tms_cutime = cputime_to_clock_t(cutime); | |
884 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
885 | } | |
886 | ||
1da177e4 LT |
887 | asmlinkage long sys_times(struct tms __user * tbuf) |
888 | { | |
1da177e4 LT |
889 | if (tbuf) { |
890 | struct tms tmp; | |
f06febc9 FM |
891 | |
892 | do_sys_times(&tmp); | |
1da177e4 LT |
893 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
894 | return -EFAULT; | |
895 | } | |
896 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); | |
897 | } | |
898 | ||
899 | /* | |
900 | * This needs some heavy checking ... | |
901 | * I just haven't the stomach for it. I also don't fully | |
902 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
903 | * | |
904 | * OK, I think I have the protection semantics right.... this is really | |
905 | * only important on a multi-user system anyway, to make sure one user | |
906 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
907 | * | |
908 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
909 | * LBT 04.03.94 | |
910 | */ | |
1da177e4 LT |
911 | asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) |
912 | { | |
913 | struct task_struct *p; | |
ee0acf90 | 914 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
915 | struct pid *pgrp; |
916 | int err; | |
1da177e4 LT |
917 | |
918 | if (!pid) | |
b488893a | 919 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
920 | if (!pgid) |
921 | pgid = pid; | |
922 | if (pgid < 0) | |
923 | return -EINVAL; | |
924 | ||
925 | /* From this point forward we keep holding onto the tasklist lock | |
926 | * so that our parent does not change from under us. -DaveM | |
927 | */ | |
928 | write_lock_irq(&tasklist_lock); | |
929 | ||
930 | err = -ESRCH; | |
4e021306 | 931 | p = find_task_by_vpid(pid); |
1da177e4 LT |
932 | if (!p) |
933 | goto out; | |
934 | ||
935 | err = -EINVAL; | |
936 | if (!thread_group_leader(p)) | |
937 | goto out; | |
938 | ||
4e021306 | 939 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 940 | err = -EPERM; |
41487c65 | 941 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
942 | goto out; |
943 | err = -EACCES; | |
944 | if (p->did_exec) | |
945 | goto out; | |
946 | } else { | |
947 | err = -ESRCH; | |
ee0acf90 | 948 | if (p != group_leader) |
1da177e4 LT |
949 | goto out; |
950 | } | |
951 | ||
952 | err = -EPERM; | |
953 | if (p->signal->leader) | |
954 | goto out; | |
955 | ||
4e021306 | 956 | pgrp = task_pid(p); |
1da177e4 | 957 | if (pgid != pid) { |
b488893a | 958 | struct task_struct *g; |
1da177e4 | 959 | |
4e021306 ON |
960 | pgrp = find_vpid(pgid); |
961 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 962 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 963 | goto out; |
1da177e4 LT |
964 | } |
965 | ||
1da177e4 LT |
966 | err = security_task_setpgid(p, pgid); |
967 | if (err) | |
968 | goto out; | |
969 | ||
4e021306 | 970 | if (task_pgrp(p) != pgrp) { |
83beaf3c | 971 | change_pid(p, PIDTYPE_PGID, pgrp); |
4e021306 | 972 | set_task_pgrp(p, pid_nr(pgrp)); |
1da177e4 LT |
973 | } |
974 | ||
975 | err = 0; | |
976 | out: | |
977 | /* All paths lead to here, thus we are safe. -DaveM */ | |
978 | write_unlock_irq(&tasklist_lock); | |
979 | return err; | |
980 | } | |
981 | ||
982 | asmlinkage long sys_getpgid(pid_t pid) | |
983 | { | |
12a3de0a ON |
984 | struct task_struct *p; |
985 | struct pid *grp; | |
986 | int retval; | |
987 | ||
988 | rcu_read_lock(); | |
756184b7 | 989 | if (!pid) |
12a3de0a | 990 | grp = task_pgrp(current); |
756184b7 | 991 | else { |
1da177e4 | 992 | retval = -ESRCH; |
12a3de0a ON |
993 | p = find_task_by_vpid(pid); |
994 | if (!p) | |
995 | goto out; | |
996 | grp = task_pgrp(p); | |
997 | if (!grp) | |
998 | goto out; | |
999 | ||
1000 | retval = security_task_getpgid(p); | |
1001 | if (retval) | |
1002 | goto out; | |
1da177e4 | 1003 | } |
12a3de0a ON |
1004 | retval = pid_vnr(grp); |
1005 | out: | |
1006 | rcu_read_unlock(); | |
1007 | return retval; | |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1011 | ||
1012 | asmlinkage long sys_getpgrp(void) | |
1013 | { | |
12a3de0a | 1014 | return sys_getpgid(0); |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | #endif | |
1018 | ||
1019 | asmlinkage long sys_getsid(pid_t pid) | |
1020 | { | |
1dd768c0 ON |
1021 | struct task_struct *p; |
1022 | struct pid *sid; | |
1023 | int retval; | |
1024 | ||
1025 | rcu_read_lock(); | |
756184b7 | 1026 | if (!pid) |
1dd768c0 | 1027 | sid = task_session(current); |
756184b7 | 1028 | else { |
1da177e4 | 1029 | retval = -ESRCH; |
1dd768c0 ON |
1030 | p = find_task_by_vpid(pid); |
1031 | if (!p) | |
1032 | goto out; | |
1033 | sid = task_session(p); | |
1034 | if (!sid) | |
1035 | goto out; | |
1036 | ||
1037 | retval = security_task_getsid(p); | |
1038 | if (retval) | |
1039 | goto out; | |
1da177e4 | 1040 | } |
1dd768c0 ON |
1041 | retval = pid_vnr(sid); |
1042 | out: | |
1043 | rcu_read_unlock(); | |
1044 | return retval; | |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | asmlinkage long sys_setsid(void) | |
1048 | { | |
e19f247a | 1049 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1050 | struct pid *sid = task_pid(group_leader); |
1051 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1052 | int err = -EPERM; |
1053 | ||
1da177e4 | 1054 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1055 | /* Fail if I am already a session leader */ |
1056 | if (group_leader->signal->leader) | |
1057 | goto out; | |
1058 | ||
430c6231 ON |
1059 | /* Fail if a process group id already exists that equals the |
1060 | * proposed session id. | |
390e2ff0 | 1061 | */ |
6806aac6 | 1062 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1063 | goto out; |
1064 | ||
e19f247a | 1065 | group_leader->signal->leader = 1; |
8520d7c7 | 1066 | __set_special_pids(sid); |
24ec839c | 1067 | |
9c9f4ded | 1068 | proc_clear_tty(group_leader); |
24ec839c | 1069 | |
e4cc0a9c | 1070 | err = session; |
1da177e4 LT |
1071 | out: |
1072 | write_unlock_irq(&tasklist_lock); | |
1da177e4 LT |
1073 | return err; |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Supplementary group IDs | |
1078 | */ | |
1079 | ||
1080 | /* init to 2 - one for init_task, one to ensure it is never freed */ | |
1081 | struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; | |
1082 | ||
1083 | struct group_info *groups_alloc(int gidsetsize) | |
1084 | { | |
1085 | struct group_info *group_info; | |
1086 | int nblocks; | |
1087 | int i; | |
1088 | ||
1089 | nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; | |
1090 | /* Make sure we always allocate at least one indirect block pointer */ | |
1091 | nblocks = nblocks ? : 1; | |
1092 | group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER); | |
1093 | if (!group_info) | |
1094 | return NULL; | |
1095 | group_info->ngroups = gidsetsize; | |
1096 | group_info->nblocks = nblocks; | |
1097 | atomic_set(&group_info->usage, 1); | |
1098 | ||
756184b7 | 1099 | if (gidsetsize <= NGROUPS_SMALL) |
1da177e4 | 1100 | group_info->blocks[0] = group_info->small_block; |
756184b7 | 1101 | else { |
1da177e4 LT |
1102 | for (i = 0; i < nblocks; i++) { |
1103 | gid_t *b; | |
1104 | b = (void *)__get_free_page(GFP_USER); | |
1105 | if (!b) | |
1106 | goto out_undo_partial_alloc; | |
1107 | group_info->blocks[i] = b; | |
1108 | } | |
1109 | } | |
1110 | return group_info; | |
1111 | ||
1112 | out_undo_partial_alloc: | |
1113 | while (--i >= 0) { | |
1114 | free_page((unsigned long)group_info->blocks[i]); | |
1115 | } | |
1116 | kfree(group_info); | |
1117 | return NULL; | |
1118 | } | |
1119 | ||
1120 | EXPORT_SYMBOL(groups_alloc); | |
1121 | ||
1122 | void groups_free(struct group_info *group_info) | |
1123 | { | |
1124 | if (group_info->blocks[0] != group_info->small_block) { | |
1125 | int i; | |
1126 | for (i = 0; i < group_info->nblocks; i++) | |
1127 | free_page((unsigned long)group_info->blocks[i]); | |
1128 | } | |
1129 | kfree(group_info); | |
1130 | } | |
1131 | ||
1132 | EXPORT_SYMBOL(groups_free); | |
1133 | ||
1134 | /* export the group_info to a user-space array */ | |
1135 | static int groups_to_user(gid_t __user *grouplist, | |
1136 | struct group_info *group_info) | |
1137 | { | |
1138 | int i; | |
1bf47346 | 1139 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1140 | |
1141 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1142 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1143 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1144 | |
1bf47346 | 1145 | if (copy_to_user(grouplist, group_info->blocks[i], len)) |
1da177e4 LT |
1146 | return -EFAULT; |
1147 | ||
1bf47346 | 1148 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1149 | count -= cp_count; |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* fill a group_info from a user-space array - it must be allocated already */ | |
1155 | static int groups_from_user(struct group_info *group_info, | |
1156 | gid_t __user *grouplist) | |
756184b7 | 1157 | { |
1da177e4 | 1158 | int i; |
1bf47346 | 1159 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1160 | |
1161 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1162 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1163 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1164 | |
1bf47346 | 1165 | if (copy_from_user(group_info->blocks[i], grouplist, len)) |
1da177e4 LT |
1166 | return -EFAULT; |
1167 | ||
1bf47346 | 1168 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1169 | count -= cp_count; |
1170 | } | |
1171 | return 0; | |
1172 | } | |
1173 | ||
ebe8b541 | 1174 | /* a simple Shell sort */ |
1da177e4 LT |
1175 | static void groups_sort(struct group_info *group_info) |
1176 | { | |
1177 | int base, max, stride; | |
1178 | int gidsetsize = group_info->ngroups; | |
1179 | ||
1180 | for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1) | |
1181 | ; /* nothing */ | |
1182 | stride /= 3; | |
1183 | ||
1184 | while (stride) { | |
1185 | max = gidsetsize - stride; | |
1186 | for (base = 0; base < max; base++) { | |
1187 | int left = base; | |
1188 | int right = left + stride; | |
1189 | gid_t tmp = GROUP_AT(group_info, right); | |
1190 | ||
1191 | while (left >= 0 && GROUP_AT(group_info, left) > tmp) { | |
1192 | GROUP_AT(group_info, right) = | |
1193 | GROUP_AT(group_info, left); | |
1194 | right = left; | |
1195 | left -= stride; | |
1196 | } | |
1197 | GROUP_AT(group_info, right) = tmp; | |
1198 | } | |
1199 | stride /= 3; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | /* a simple bsearch */ | |
86a264ab | 1204 | int groups_search(const struct group_info *group_info, gid_t grp) |
1da177e4 | 1205 | { |
d74beb9f | 1206 | unsigned int left, right; |
1da177e4 LT |
1207 | |
1208 | if (!group_info) | |
1209 | return 0; | |
1210 | ||
1211 | left = 0; | |
1212 | right = group_info->ngroups; | |
1213 | while (left < right) { | |
d74beb9f | 1214 | unsigned int mid = (left+right)/2; |
1da177e4 LT |
1215 | int cmp = grp - GROUP_AT(group_info, mid); |
1216 | if (cmp > 0) | |
1217 | left = mid + 1; | |
1218 | else if (cmp < 0) | |
1219 | right = mid; | |
1220 | else | |
1221 | return 1; | |
1222 | } | |
1223 | return 0; | |
1224 | } | |
1225 | ||
b6dff3ec DH |
1226 | /** |
1227 | * set_groups - Change a group subscription in a security record | |
1228 | * @sec: The security record to alter | |
1229 | * @group_info: The group list to impose | |
1230 | * | |
1231 | * Validate a group subscription and, if valid, impose it upon a task security | |
1232 | * record. | |
1233 | */ | |
1234 | int set_groups(struct cred *cred, struct group_info *group_info) | |
1da177e4 LT |
1235 | { |
1236 | int retval; | |
1237 | struct group_info *old_info; | |
1238 | ||
1239 | retval = security_task_setgroups(group_info); | |
1240 | if (retval) | |
1241 | return retval; | |
1242 | ||
1243 | groups_sort(group_info); | |
1244 | get_group_info(group_info); | |
1245 | ||
b6dff3ec DH |
1246 | spin_lock(&cred->lock); |
1247 | old_info = cred->group_info; | |
1248 | cred->group_info = group_info; | |
1249 | spin_unlock(&cred->lock); | |
1da177e4 LT |
1250 | |
1251 | put_group_info(old_info); | |
1da177e4 LT |
1252 | return 0; |
1253 | } | |
1254 | ||
b6dff3ec DH |
1255 | EXPORT_SYMBOL(set_groups); |
1256 | ||
1257 | /** | |
1258 | * set_current_groups - Change current's group subscription | |
1259 | * @group_info: The group list to impose | |
1260 | * | |
1261 | * Validate a group subscription and, if valid, impose it upon current's task | |
1262 | * security record. | |
1263 | */ | |
1264 | int set_current_groups(struct group_info *group_info) | |
1265 | { | |
1266 | return set_groups(current->cred, group_info); | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | EXPORT_SYMBOL(set_current_groups); |
1270 | ||
1271 | asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) | |
1272 | { | |
86a264ab DH |
1273 | const struct cred *cred = current_cred(); |
1274 | int i; | |
1da177e4 LT |
1275 | |
1276 | if (gidsetsize < 0) | |
1277 | return -EINVAL; | |
1278 | ||
1279 | /* no need to grab task_lock here; it cannot change */ | |
b6dff3ec | 1280 | i = cred->group_info->ngroups; |
1da177e4 LT |
1281 | if (gidsetsize) { |
1282 | if (i > gidsetsize) { | |
1283 | i = -EINVAL; | |
1284 | goto out; | |
1285 | } | |
b6dff3ec | 1286 | if (groups_to_user(grouplist, cred->group_info)) { |
1da177e4 LT |
1287 | i = -EFAULT; |
1288 | goto out; | |
1289 | } | |
1290 | } | |
1291 | out: | |
1da177e4 LT |
1292 | return i; |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * SMP: Our groups are copy-on-write. We can set them safely | |
1297 | * without another task interfering. | |
1298 | */ | |
1299 | ||
1300 | asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist) | |
1301 | { | |
1302 | struct group_info *group_info; | |
1303 | int retval; | |
1304 | ||
1305 | if (!capable(CAP_SETGID)) | |
1306 | return -EPERM; | |
1307 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | group_info = groups_alloc(gidsetsize); | |
1311 | if (!group_info) | |
1312 | return -ENOMEM; | |
1313 | retval = groups_from_user(group_info, grouplist); | |
1314 | if (retval) { | |
1315 | put_group_info(group_info); | |
1316 | return retval; | |
1317 | } | |
1318 | ||
1319 | retval = set_current_groups(group_info); | |
1320 | put_group_info(group_info); | |
1321 | ||
1322 | return retval; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Check whether we're fsgid/egid or in the supplemental group.. | |
1327 | */ | |
1328 | int in_group_p(gid_t grp) | |
1329 | { | |
86a264ab | 1330 | const struct cred *cred = current_cred(); |
1da177e4 | 1331 | int retval = 1; |
86a264ab | 1332 | |
b6dff3ec DH |
1333 | if (grp != cred->fsgid) |
1334 | retval = groups_search(cred->group_info, grp); | |
1da177e4 LT |
1335 | return retval; |
1336 | } | |
1337 | ||
1338 | EXPORT_SYMBOL(in_group_p); | |
1339 | ||
1340 | int in_egroup_p(gid_t grp) | |
1341 | { | |
86a264ab | 1342 | const struct cred *cred = current_cred(); |
1da177e4 | 1343 | int retval = 1; |
86a264ab | 1344 | |
b6dff3ec DH |
1345 | if (grp != cred->egid) |
1346 | retval = groups_search(cred->group_info, grp); | |
1da177e4 LT |
1347 | return retval; |
1348 | } | |
1349 | ||
1350 | EXPORT_SYMBOL(in_egroup_p); | |
1351 | ||
1352 | DECLARE_RWSEM(uts_sem); | |
1353 | ||
1da177e4 LT |
1354 | asmlinkage long sys_newuname(struct new_utsname __user * name) |
1355 | { | |
1356 | int errno = 0; | |
1357 | ||
1358 | down_read(&uts_sem); | |
e9ff3990 | 1359 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1360 | errno = -EFAULT; |
1361 | up_read(&uts_sem); | |
1362 | return errno; | |
1363 | } | |
1364 | ||
1365 | asmlinkage long sys_sethostname(char __user *name, int len) | |
1366 | { | |
1367 | int errno; | |
1368 | char tmp[__NEW_UTS_LEN]; | |
1369 | ||
1370 | if (!capable(CAP_SYS_ADMIN)) | |
1371 | return -EPERM; | |
1372 | if (len < 0 || len > __NEW_UTS_LEN) | |
1373 | return -EINVAL; | |
1374 | down_write(&uts_sem); | |
1375 | errno = -EFAULT; | |
1376 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1377 | struct new_utsname *u = utsname(); |
1378 | ||
1379 | memcpy(u->nodename, tmp, len); | |
1380 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1381 | errno = 0; |
1382 | } | |
1383 | up_write(&uts_sem); | |
1384 | return errno; | |
1385 | } | |
1386 | ||
1387 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1388 | ||
1389 | asmlinkage long sys_gethostname(char __user *name, int len) | |
1390 | { | |
1391 | int i, errno; | |
9679e4dd | 1392 | struct new_utsname *u; |
1da177e4 LT |
1393 | |
1394 | if (len < 0) | |
1395 | return -EINVAL; | |
1396 | down_read(&uts_sem); | |
9679e4dd AM |
1397 | u = utsname(); |
1398 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1399 | if (i > len) |
1400 | i = len; | |
1401 | errno = 0; | |
9679e4dd | 1402 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1403 | errno = -EFAULT; |
1404 | up_read(&uts_sem); | |
1405 | return errno; | |
1406 | } | |
1407 | ||
1408 | #endif | |
1409 | ||
1410 | /* | |
1411 | * Only setdomainname; getdomainname can be implemented by calling | |
1412 | * uname() | |
1413 | */ | |
1414 | asmlinkage long sys_setdomainname(char __user *name, int len) | |
1415 | { | |
1416 | int errno; | |
1417 | char tmp[__NEW_UTS_LEN]; | |
1418 | ||
1419 | if (!capable(CAP_SYS_ADMIN)) | |
1420 | return -EPERM; | |
1421 | if (len < 0 || len > __NEW_UTS_LEN) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | down_write(&uts_sem); | |
1425 | errno = -EFAULT; | |
1426 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1427 | struct new_utsname *u = utsname(); |
1428 | ||
1429 | memcpy(u->domainname, tmp, len); | |
1430 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1431 | errno = 0; |
1432 | } | |
1433 | up_write(&uts_sem); | |
1434 | return errno; | |
1435 | } | |
1436 | ||
1437 | asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1438 | { | |
1439 | if (resource >= RLIM_NLIMITS) | |
1440 | return -EINVAL; | |
1441 | else { | |
1442 | struct rlimit value; | |
1443 | task_lock(current->group_leader); | |
1444 | value = current->signal->rlim[resource]; | |
1445 | task_unlock(current->group_leader); | |
1446 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1447 | } | |
1448 | } | |
1449 | ||
1450 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1451 | ||
1452 | /* | |
1453 | * Back compatibility for getrlimit. Needed for some apps. | |
1454 | */ | |
1455 | ||
1456 | asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1457 | { | |
1458 | struct rlimit x; | |
1459 | if (resource >= RLIM_NLIMITS) | |
1460 | return -EINVAL; | |
1461 | ||
1462 | task_lock(current->group_leader); | |
1463 | x = current->signal->rlim[resource]; | |
1464 | task_unlock(current->group_leader); | |
756184b7 | 1465 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1466 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1467 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1468 | x.rlim_max = 0x7FFFFFFF; |
1469 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1470 | } | |
1471 | ||
1472 | #endif | |
1473 | ||
1474 | asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1475 | { | |
1476 | struct rlimit new_rlim, *old_rlim; | |
1477 | int retval; | |
1478 | ||
1479 | if (resource >= RLIM_NLIMITS) | |
1480 | return -EINVAL; | |
ec9e16ba | 1481 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1482 | return -EFAULT; |
1da177e4 LT |
1483 | old_rlim = current->signal->rlim + resource; |
1484 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1485 | !capable(CAP_SYS_RESOURCE)) | |
1486 | return -EPERM; | |
0c2d64fb AT |
1487 | |
1488 | if (resource == RLIMIT_NOFILE) { | |
1489 | if (new_rlim.rlim_max == RLIM_INFINITY) | |
1490 | new_rlim.rlim_max = sysctl_nr_open; | |
1491 | if (new_rlim.rlim_cur == RLIM_INFINITY) | |
1492 | new_rlim.rlim_cur = sysctl_nr_open; | |
1493 | if (new_rlim.rlim_max > sysctl_nr_open) | |
1494 | return -EPERM; | |
1495 | } | |
1496 | ||
1497 | if (new_rlim.rlim_cur > new_rlim.rlim_max) | |
1498 | return -EINVAL; | |
1da177e4 LT |
1499 | |
1500 | retval = security_task_setrlimit(resource, &new_rlim); | |
1501 | if (retval) | |
1502 | return retval; | |
1503 | ||
9926e4c7 TA |
1504 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1505 | /* | |
1506 | * The caller is asking for an immediate RLIMIT_CPU | |
1507 | * expiry. But we use the zero value to mean "it was | |
1508 | * never set". So let's cheat and make it one second | |
1509 | * instead | |
1510 | */ | |
1511 | new_rlim.rlim_cur = 1; | |
1512 | } | |
1513 | ||
1da177e4 LT |
1514 | task_lock(current->group_leader); |
1515 | *old_rlim = new_rlim; | |
1516 | task_unlock(current->group_leader); | |
1517 | ||
ec9e16ba AM |
1518 | if (resource != RLIMIT_CPU) |
1519 | goto out; | |
d3561f78 AM |
1520 | |
1521 | /* | |
1522 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1523 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1524 | * very long-standing error, and fixing it now risks breakage of | |
1525 | * applications, so we live with it | |
1526 | */ | |
ec9e16ba AM |
1527 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1528 | goto out; | |
1529 | ||
f06febc9 | 1530 | update_rlimit_cpu(new_rlim.rlim_cur); |
ec9e16ba | 1531 | out: |
1da177e4 LT |
1532 | return 0; |
1533 | } | |
1534 | ||
1535 | /* | |
1536 | * It would make sense to put struct rusage in the task_struct, | |
1537 | * except that would make the task_struct be *really big*. After | |
1538 | * task_struct gets moved into malloc'ed memory, it would | |
1539 | * make sense to do this. It will make moving the rest of the information | |
1540 | * a lot simpler! (Which we're not doing right now because we're not | |
1541 | * measuring them yet). | |
1542 | * | |
1da177e4 LT |
1543 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1544 | * races with threads incrementing their own counters. But since word | |
1545 | * reads are atomic, we either get new values or old values and we don't | |
1546 | * care which for the sums. We always take the siglock to protect reading | |
1547 | * the c* fields from p->signal from races with exit.c updating those | |
1548 | * fields when reaping, so a sample either gets all the additions of a | |
1549 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1550 | * |
de047c1b RT |
1551 | * Locking: |
1552 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1553 | * for the cases current multithreaded, non-current single threaded | |
1554 | * non-current multithreaded. Thread traversal is now safe with | |
1555 | * the siglock held. | |
1556 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1557 | * single threaded, as no one else can take our signal_struct away, no one | |
1558 | * else can reap the children to update signal->c* counters, and no one else | |
1559 | * can race with the signal-> fields. If we do not take any lock, the | |
1560 | * signal-> fields could be read out of order while another thread was just | |
1561 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1562 | * On the writer side, write memory barrier is implied in __exit_signal | |
1563 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1564 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1565 | * |
1da177e4 LT |
1566 | */ |
1567 | ||
f06febc9 | 1568 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1569 | { |
679c9cd4 SK |
1570 | r->ru_nvcsw += t->nvcsw; |
1571 | r->ru_nivcsw += t->nivcsw; | |
1572 | r->ru_minflt += t->min_flt; | |
1573 | r->ru_majflt += t->maj_flt; | |
1574 | r->ru_inblock += task_io_get_inblock(t); | |
1575 | r->ru_oublock += task_io_get_oublock(t); | |
1576 | } | |
1577 | ||
1da177e4 LT |
1578 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1579 | { | |
1580 | struct task_struct *t; | |
1581 | unsigned long flags; | |
1582 | cputime_t utime, stime; | |
f06febc9 | 1583 | struct task_cputime cputime; |
1da177e4 LT |
1584 | |
1585 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1586 | utime = stime = cputime_zero; |
1da177e4 | 1587 | |
679c9cd4 | 1588 | if (who == RUSAGE_THREAD) { |
f06febc9 | 1589 | accumulate_thread_rusage(p, r); |
679c9cd4 SK |
1590 | goto out; |
1591 | } | |
1592 | ||
d6cf723a | 1593 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1594 | return; |
0f59cc4a | 1595 | |
1da177e4 | 1596 | switch (who) { |
0f59cc4a | 1597 | case RUSAGE_BOTH: |
1da177e4 | 1598 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1599 | utime = p->signal->cutime; |
1600 | stime = p->signal->cstime; | |
1601 | r->ru_nvcsw = p->signal->cnvcsw; | |
1602 | r->ru_nivcsw = p->signal->cnivcsw; | |
1603 | r->ru_minflt = p->signal->cmin_flt; | |
1604 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1605 | r->ru_inblock = p->signal->cinblock; |
1606 | r->ru_oublock = p->signal->coublock; | |
0f59cc4a ON |
1607 | |
1608 | if (who == RUSAGE_CHILDREN) | |
1609 | break; | |
1610 | ||
1da177e4 | 1611 | case RUSAGE_SELF: |
f06febc9 FM |
1612 | thread_group_cputime(p, &cputime); |
1613 | utime = cputime_add(utime, cputime.utime); | |
1614 | stime = cputime_add(stime, cputime.stime); | |
1da177e4 LT |
1615 | r->ru_nvcsw += p->signal->nvcsw; |
1616 | r->ru_nivcsw += p->signal->nivcsw; | |
1617 | r->ru_minflt += p->signal->min_flt; | |
1618 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1619 | r->ru_inblock += p->signal->inblock; |
1620 | r->ru_oublock += p->signal->oublock; | |
1da177e4 LT |
1621 | t = p; |
1622 | do { | |
f06febc9 | 1623 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1624 | t = next_thread(t); |
1625 | } while (t != p); | |
1da177e4 | 1626 | break; |
0f59cc4a | 1627 | |
1da177e4 LT |
1628 | default: |
1629 | BUG(); | |
1630 | } | |
de047c1b | 1631 | unlock_task_sighand(p, &flags); |
de047c1b | 1632 | |
679c9cd4 | 1633 | out: |
0f59cc4a ON |
1634 | cputime_to_timeval(utime, &r->ru_utime); |
1635 | cputime_to_timeval(stime, &r->ru_stime); | |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1639 | { | |
1640 | struct rusage r; | |
1da177e4 | 1641 | k_getrusage(p, who, &r); |
1da177e4 LT |
1642 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1643 | } | |
1644 | ||
1645 | asmlinkage long sys_getrusage(int who, struct rusage __user *ru) | |
1646 | { | |
679c9cd4 SK |
1647 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1648 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1649 | return -EINVAL; |
1650 | return getrusage(current, who, ru); | |
1651 | } | |
1652 | ||
1653 | asmlinkage long sys_umask(int mask) | |
1654 | { | |
1655 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1656 | return mask; | |
1657 | } | |
3b7391de | 1658 | |
1da177e4 LT |
1659 | asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, |
1660 | unsigned long arg4, unsigned long arg5) | |
1661 | { | |
b6dff3ec DH |
1662 | struct task_struct *me = current; |
1663 | unsigned char comm[sizeof(me->comm)]; | |
1664 | long error; | |
1da177e4 | 1665 | |
3898b1b4 | 1666 | if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error)) |
1da177e4 LT |
1667 | return error; |
1668 | ||
1669 | switch (option) { | |
1670 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1671 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1672 | error = -EINVAL; |
1673 | break; | |
1674 | } | |
b6dff3ec DH |
1675 | me->pdeath_signal = arg2; |
1676 | error = 0; | |
1da177e4 LT |
1677 | break; |
1678 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1679 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1680 | break; |
1681 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1682 | error = get_dumpable(me->mm); |
1da177e4 LT |
1683 | break; |
1684 | case PR_SET_DUMPABLE: | |
abf75a50 | 1685 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1686 | error = -EINVAL; |
1687 | break; | |
1688 | } | |
b6dff3ec DH |
1689 | set_dumpable(me->mm, arg2); |
1690 | error = 0; | |
1da177e4 LT |
1691 | break; |
1692 | ||
1693 | case PR_SET_UNALIGN: | |
b6dff3ec | 1694 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1695 | break; |
1696 | case PR_GET_UNALIGN: | |
b6dff3ec | 1697 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1698 | break; |
1699 | case PR_SET_FPEMU: | |
b6dff3ec | 1700 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1701 | break; |
1702 | case PR_GET_FPEMU: | |
b6dff3ec | 1703 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1704 | break; |
1705 | case PR_SET_FPEXC: | |
b6dff3ec | 1706 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1707 | break; |
1708 | case PR_GET_FPEXC: | |
b6dff3ec | 1709 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1710 | break; |
1711 | case PR_GET_TIMING: | |
1712 | error = PR_TIMING_STATISTICAL; | |
1713 | break; | |
1714 | case PR_SET_TIMING: | |
7b26655f | 1715 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1716 | error = -EINVAL; |
b6dff3ec DH |
1717 | else |
1718 | error = 0; | |
1da177e4 LT |
1719 | break; |
1720 | ||
b6dff3ec DH |
1721 | case PR_SET_NAME: |
1722 | comm[sizeof(me->comm)-1] = 0; | |
1723 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1724 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1725 | return -EFAULT; |
b6dff3ec | 1726 | set_task_comm(me, comm); |
1da177e4 | 1727 | return 0; |
b6dff3ec DH |
1728 | case PR_GET_NAME: |
1729 | get_task_comm(comm, me); | |
1730 | if (copy_to_user((char __user *)arg2, comm, | |
1731 | sizeof(comm))) | |
1da177e4 LT |
1732 | return -EFAULT; |
1733 | return 0; | |
651d765d | 1734 | case PR_GET_ENDIAN: |
b6dff3ec | 1735 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1736 | break; |
1737 | case PR_SET_ENDIAN: | |
b6dff3ec | 1738 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1739 | break; |
1740 | ||
1d9d02fe AA |
1741 | case PR_GET_SECCOMP: |
1742 | error = prctl_get_seccomp(); | |
1743 | break; | |
1744 | case PR_SET_SECCOMP: | |
1745 | error = prctl_set_seccomp(arg2); | |
1746 | break; | |
8fb402bc EB |
1747 | case PR_GET_TSC: |
1748 | error = GET_TSC_CTL(arg2); | |
1749 | break; | |
1750 | case PR_SET_TSC: | |
1751 | error = SET_TSC_CTL(arg2); | |
1752 | break; | |
6976675d AV |
1753 | case PR_GET_TIMERSLACK: |
1754 | error = current->timer_slack_ns; | |
1755 | break; | |
1756 | case PR_SET_TIMERSLACK: | |
1757 | if (arg2 <= 0) | |
1758 | current->timer_slack_ns = | |
1759 | current->default_timer_slack_ns; | |
1760 | else | |
1761 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1762 | error = 0; |
6976675d | 1763 | break; |
1da177e4 LT |
1764 | default: |
1765 | error = -EINVAL; | |
1766 | break; | |
1767 | } | |
1768 | return error; | |
1769 | } | |
3cfc348b AK |
1770 | |
1771 | asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, | |
4307d1e5 | 1772 | struct getcpu_cache __user *unused) |
3cfc348b AK |
1773 | { |
1774 | int err = 0; | |
1775 | int cpu = raw_smp_processor_id(); | |
1776 | if (cpup) | |
1777 | err |= put_user(cpu, cpup); | |
1778 | if (nodep) | |
1779 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1780 | return err ? -EFAULT : 0; |
1781 | } | |
10a0a8d4 JF |
1782 | |
1783 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1784 | ||
1785 | static void argv_cleanup(char **argv, char **envp) | |
1786 | { | |
1787 | argv_free(argv); | |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * orderly_poweroff - Trigger an orderly system poweroff | |
1792 | * @force: force poweroff if command execution fails | |
1793 | * | |
1794 | * This may be called from any context to trigger a system shutdown. | |
1795 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1796 | */ | |
1797 | int orderly_poweroff(bool force) | |
1798 | { | |
1799 | int argc; | |
1800 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1801 | static char *envp[] = { | |
1802 | "HOME=/", | |
1803 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1804 | NULL | |
1805 | }; | |
1806 | int ret = -ENOMEM; | |
1807 | struct subprocess_info *info; | |
1808 | ||
1809 | if (argv == NULL) { | |
1810 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1811 | __func__, poweroff_cmd); | |
1812 | goto out; | |
1813 | } | |
1814 | ||
ac331d15 | 1815 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1816 | if (info == NULL) { |
1817 | argv_free(argv); | |
1818 | goto out; | |
1819 | } | |
1820 | ||
1821 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1822 | ||
86313c48 | 1823 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1824 | |
1825 | out: | |
1826 | if (ret && force) { | |
1827 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1828 | "forcing the issue\n"); | |
1829 | ||
1830 | /* I guess this should try to kick off some daemon to | |
1831 | sync and poweroff asap. Or not even bother syncing | |
1832 | if we're doing an emergency shutdown? */ | |
1833 | emergency_sync(); | |
1834 | kernel_power_off(); | |
1835 | } | |
1836 | ||
1837 | return ret; | |
1838 | } | |
1839 | EXPORT_SYMBOL_GPL(orderly_poweroff); |