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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
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; | |
146 | int error = -EINVAL; | |
41487c65 | 147 | struct pid *pgrp; |
1da177e4 | 148 | |
3e88c553 | 149 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
150 | goto out; |
151 | ||
152 | /* normalize: avoid signed division (rounding problems) */ | |
153 | error = -ESRCH; | |
154 | if (niceval < -20) | |
155 | niceval = -20; | |
156 | if (niceval > 19) | |
157 | niceval = 19; | |
158 | ||
159 | read_lock(&tasklist_lock); | |
160 | switch (which) { | |
161 | case PRIO_PROCESS: | |
41487c65 | 162 | if (who) |
228ebcbe | 163 | p = find_task_by_vpid(who); |
41487c65 EB |
164 | else |
165 | p = current; | |
1da177e4 LT |
166 | if (p) |
167 | error = set_one_prio(p, niceval, error); | |
168 | break; | |
169 | case PRIO_PGRP: | |
41487c65 | 170 | if (who) |
b488893a | 171 | pgrp = find_vpid(who); |
41487c65 EB |
172 | else |
173 | pgrp = task_pgrp(current); | |
2d70b68d | 174 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 175 | error = set_one_prio(p, niceval, error); |
2d70b68d | 176 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
177 | break; |
178 | case PRIO_USER: | |
b6dff3ec | 179 | user = current->cred->user; |
1da177e4 | 180 | if (!who) |
76aac0e9 | 181 | who = current_uid(); |
1da177e4 | 182 | else |
76aac0e9 | 183 | if (who != current_uid() && !(user = find_user(who))) |
1da177e4 LT |
184 | goto out_unlock; /* No processes for this user */ |
185 | ||
186 | do_each_thread(g, p) | |
b6dff3ec | 187 | if (p->cred->uid == who) |
1da177e4 LT |
188 | error = set_one_prio(p, niceval, error); |
189 | while_each_thread(g, p); | |
76aac0e9 | 190 | if (who != current_uid()) |
1da177e4 LT |
191 | free_uid(user); /* For find_user() */ |
192 | break; | |
193 | } | |
194 | out_unlock: | |
195 | read_unlock(&tasklist_lock); | |
196 | out: | |
197 | return error; | |
198 | } | |
199 | ||
200 | /* | |
201 | * Ugh. To avoid negative return values, "getpriority()" will | |
202 | * not return the normal nice-value, but a negated value that | |
203 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
204 | * to stay compatible. | |
205 | */ | |
206 | asmlinkage long sys_getpriority(int which, int who) | |
207 | { | |
208 | struct task_struct *g, *p; | |
209 | struct user_struct *user; | |
210 | long niceval, retval = -ESRCH; | |
41487c65 | 211 | struct pid *pgrp; |
1da177e4 | 212 | |
3e88c553 | 213 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
214 | return -EINVAL; |
215 | ||
216 | read_lock(&tasklist_lock); | |
217 | switch (which) { | |
218 | case PRIO_PROCESS: | |
41487c65 | 219 | if (who) |
228ebcbe | 220 | p = find_task_by_vpid(who); |
41487c65 EB |
221 | else |
222 | p = current; | |
1da177e4 LT |
223 | if (p) { |
224 | niceval = 20 - task_nice(p); | |
225 | if (niceval > retval) | |
226 | retval = niceval; | |
227 | } | |
228 | break; | |
229 | case PRIO_PGRP: | |
41487c65 | 230 | if (who) |
b488893a | 231 | pgrp = find_vpid(who); |
41487c65 EB |
232 | else |
233 | pgrp = task_pgrp(current); | |
2d70b68d | 234 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
235 | niceval = 20 - task_nice(p); |
236 | if (niceval > retval) | |
237 | retval = niceval; | |
2d70b68d | 238 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
239 | break; |
240 | case PRIO_USER: | |
b6dff3ec | 241 | user = current->cred->user; |
1da177e4 | 242 | if (!who) |
76aac0e9 | 243 | who = current_uid(); |
1da177e4 | 244 | else |
76aac0e9 | 245 | if (who != current_uid() && !(user = find_user(who))) |
1da177e4 LT |
246 | goto out_unlock; /* No processes for this user */ |
247 | ||
248 | do_each_thread(g, p) | |
b6dff3ec | 249 | if (p->cred->uid == who) { |
1da177e4 LT |
250 | niceval = 20 - task_nice(p); |
251 | if (niceval > retval) | |
252 | retval = niceval; | |
253 | } | |
254 | while_each_thread(g, p); | |
76aac0e9 | 255 | if (who != current_uid()) |
1da177e4 LT |
256 | free_uid(user); /* for find_user() */ |
257 | break; | |
258 | } | |
259 | out_unlock: | |
260 | read_unlock(&tasklist_lock); | |
261 | ||
262 | return retval; | |
263 | } | |
264 | ||
e4c94330 EB |
265 | /** |
266 | * emergency_restart - reboot the system | |
267 | * | |
268 | * Without shutting down any hardware or taking any locks | |
269 | * reboot the system. This is called when we know we are in | |
270 | * trouble so this is our best effort to reboot. This is | |
271 | * safe to call in interrupt context. | |
272 | */ | |
7c903473 EB |
273 | void emergency_restart(void) |
274 | { | |
275 | machine_emergency_restart(); | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(emergency_restart); | |
278 | ||
ca195b7f | 279 | void kernel_restart_prepare(char *cmd) |
4a00ea1e | 280 | { |
e041c683 | 281 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 282 | system_state = SYSTEM_RESTART; |
4a00ea1e | 283 | device_shutdown(); |
58b3b71d | 284 | sysdev_shutdown(); |
e4c94330 | 285 | } |
1e5d5331 RD |
286 | |
287 | /** | |
288 | * kernel_restart - reboot the system | |
289 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 290 | * or %NULL |
1e5d5331 RD |
291 | * |
292 | * Shutdown everything and perform a clean reboot. | |
293 | * This is not safe to call in interrupt context. | |
294 | */ | |
e4c94330 EB |
295 | void kernel_restart(char *cmd) |
296 | { | |
297 | kernel_restart_prepare(cmd); | |
756184b7 | 298 | if (!cmd) |
4a00ea1e | 299 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 300 | else |
4a00ea1e | 301 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
302 | machine_restart(cmd); |
303 | } | |
304 | EXPORT_SYMBOL_GPL(kernel_restart); | |
305 | ||
4ef7229f | 306 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 307 | { |
e041c683 | 308 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
309 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
310 | system_state = state; | |
311 | device_shutdown(); | |
312 | } | |
e4c94330 EB |
313 | /** |
314 | * kernel_halt - halt the system | |
315 | * | |
316 | * Shutdown everything and perform a clean system halt. | |
317 | */ | |
e4c94330 EB |
318 | void kernel_halt(void) |
319 | { | |
729b4d4c | 320 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 321 | sysdev_shutdown(); |
4a00ea1e EB |
322 | printk(KERN_EMERG "System halted.\n"); |
323 | machine_halt(); | |
324 | } | |
729b4d4c | 325 | |
4a00ea1e EB |
326 | EXPORT_SYMBOL_GPL(kernel_halt); |
327 | ||
e4c94330 EB |
328 | /** |
329 | * kernel_power_off - power_off the system | |
330 | * | |
331 | * Shutdown everything and perform a clean system power_off. | |
332 | */ | |
e4c94330 EB |
333 | void kernel_power_off(void) |
334 | { | |
729b4d4c | 335 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
336 | if (pm_power_off_prepare) |
337 | pm_power_off_prepare(); | |
4047727e | 338 | disable_nonboot_cpus(); |
58b3b71d | 339 | sysdev_shutdown(); |
4a00ea1e EB |
340 | printk(KERN_EMERG "Power down.\n"); |
341 | machine_power_off(); | |
342 | } | |
343 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
1da177e4 LT |
344 | /* |
345 | * Reboot system call: for obvious reasons only root may call it, | |
346 | * and even root needs to set up some magic numbers in the registers | |
347 | * so that some mistake won't make this reboot the whole machine. | |
348 | * You can also set the meaning of the ctrl-alt-del-key here. | |
349 | * | |
350 | * reboot doesn't sync: do that yourself before calling this. | |
351 | */ | |
352 | asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) | |
353 | { | |
354 | char buffer[256]; | |
355 | ||
356 | /* We only trust the superuser with rebooting the system. */ | |
357 | if (!capable(CAP_SYS_BOOT)) | |
358 | return -EPERM; | |
359 | ||
360 | /* For safety, we require "magic" arguments. */ | |
361 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
362 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
363 | magic2 != LINUX_REBOOT_MAGIC2A && | |
364 | magic2 != LINUX_REBOOT_MAGIC2B && | |
365 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
366 | return -EINVAL; | |
367 | ||
5e38291d EB |
368 | /* Instead of trying to make the power_off code look like |
369 | * halt when pm_power_off is not set do it the easy way. | |
370 | */ | |
371 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
372 | cmd = LINUX_REBOOT_CMD_HALT; | |
373 | ||
1da177e4 LT |
374 | lock_kernel(); |
375 | switch (cmd) { | |
376 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 377 | kernel_restart(NULL); |
1da177e4 LT |
378 | break; |
379 | ||
380 | case LINUX_REBOOT_CMD_CAD_ON: | |
381 | C_A_D = 1; | |
382 | break; | |
383 | ||
384 | case LINUX_REBOOT_CMD_CAD_OFF: | |
385 | C_A_D = 0; | |
386 | break; | |
387 | ||
388 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 389 | kernel_halt(); |
1da177e4 LT |
390 | unlock_kernel(); |
391 | do_exit(0); | |
392 | break; | |
393 | ||
394 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 395 | kernel_power_off(); |
1da177e4 LT |
396 | unlock_kernel(); |
397 | do_exit(0); | |
398 | break; | |
399 | ||
400 | case LINUX_REBOOT_CMD_RESTART2: | |
401 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
402 | unlock_kernel(); | |
403 | return -EFAULT; | |
404 | } | |
405 | buffer[sizeof(buffer) - 1] = '\0'; | |
406 | ||
4a00ea1e | 407 | kernel_restart(buffer); |
1da177e4 LT |
408 | break; |
409 | ||
3ab83521 | 410 | #ifdef CONFIG_KEXEC |
dc009d92 | 411 | case LINUX_REBOOT_CMD_KEXEC: |
3ab83521 HY |
412 | { |
413 | int ret; | |
414 | ret = kernel_kexec(); | |
415 | unlock_kernel(); | |
416 | return ret; | |
417 | } | |
418 | #endif | |
4a00ea1e | 419 | |
b0cb1a19 | 420 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
421 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
422 | { | |
a3d25c27 | 423 | int ret = hibernate(); |
1da177e4 LT |
424 | unlock_kernel(); |
425 | return ret; | |
426 | } | |
427 | #endif | |
428 | ||
429 | default: | |
430 | unlock_kernel(); | |
431 | return -EINVAL; | |
432 | } | |
433 | unlock_kernel(); | |
434 | return 0; | |
435 | } | |
436 | ||
65f27f38 | 437 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 438 | { |
abcd9e51 | 439 | kernel_restart(NULL); |
1da177e4 LT |
440 | } |
441 | ||
442 | /* | |
443 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
444 | * As it's called within an interrupt, it may NOT sync: the only choice | |
445 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
446 | */ | |
447 | void ctrl_alt_del(void) | |
448 | { | |
65f27f38 | 449 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
450 | |
451 | if (C_A_D) | |
452 | schedule_work(&cad_work); | |
453 | else | |
9ec52099 | 454 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
455 | } |
456 | ||
1da177e4 LT |
457 | /* |
458 | * Unprivileged users may change the real gid to the effective gid | |
459 | * or vice versa. (BSD-style) | |
460 | * | |
461 | * If you set the real gid at all, or set the effective gid to a value not | |
462 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
463 | * | |
464 | * This makes it possible for a setgid program to completely drop its | |
465 | * privileges, which is often a useful assertion to make when you are doing | |
466 | * a security audit over a program. | |
467 | * | |
468 | * The general idea is that a program which uses just setregid() will be | |
469 | * 100% compatible with BSD. A program which uses just setgid() will be | |
470 | * 100% compatible with POSIX with saved IDs. | |
471 | * | |
472 | * SMP: There are not races, the GIDs are checked only by filesystem | |
473 | * operations (as far as semantic preservation is concerned). | |
474 | */ | |
475 | asmlinkage long sys_setregid(gid_t rgid, gid_t egid) | |
476 | { | |
b6dff3ec DH |
477 | struct cred *cred = current->cred; |
478 | int old_rgid = cred->gid; | |
479 | int old_egid = cred->egid; | |
1da177e4 LT |
480 | int new_rgid = old_rgid; |
481 | int new_egid = old_egid; | |
482 | int retval; | |
483 | ||
484 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); | |
485 | if (retval) | |
486 | return retval; | |
487 | ||
488 | if (rgid != (gid_t) -1) { | |
489 | if ((old_rgid == rgid) || | |
b6dff3ec | 490 | (cred->egid == rgid) || |
1da177e4 LT |
491 | capable(CAP_SETGID)) |
492 | new_rgid = rgid; | |
493 | else | |
494 | return -EPERM; | |
495 | } | |
496 | if (egid != (gid_t) -1) { | |
497 | if ((old_rgid == egid) || | |
b6dff3ec DH |
498 | (cred->egid == egid) || |
499 | (cred->sgid == egid) || | |
1da177e4 LT |
500 | capable(CAP_SETGID)) |
501 | new_egid = egid; | |
756184b7 | 502 | else |
1da177e4 | 503 | return -EPERM; |
1da177e4 | 504 | } |
756184b7 | 505 | if (new_egid != old_egid) { |
6c5d5238 | 506 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 507 | smp_wmb(); |
1da177e4 LT |
508 | } |
509 | if (rgid != (gid_t) -1 || | |
510 | (egid != (gid_t) -1 && egid != old_rgid)) | |
b6dff3ec DH |
511 | cred->sgid = new_egid; |
512 | cred->fsgid = new_egid; | |
513 | cred->egid = new_egid; | |
514 | cred->gid = new_rgid; | |
1da177e4 | 515 | key_fsgid_changed(current); |
9f46080c | 516 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
517 | return 0; |
518 | } | |
519 | ||
520 | /* | |
521 | * setgid() is implemented like SysV w/ SAVED_IDS | |
522 | * | |
523 | * SMP: Same implicit races as above. | |
524 | */ | |
525 | asmlinkage long sys_setgid(gid_t gid) | |
526 | { | |
b6dff3ec DH |
527 | struct cred *cred = current->cred; |
528 | int old_egid = cred->egid; | |
1da177e4 LT |
529 | int retval; |
530 | ||
531 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); | |
532 | if (retval) | |
533 | return retval; | |
534 | ||
756184b7 CP |
535 | if (capable(CAP_SETGID)) { |
536 | if (old_egid != gid) { | |
6c5d5238 | 537 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 538 | smp_wmb(); |
1da177e4 | 539 | } |
b6dff3ec DH |
540 | cred->gid = cred->egid = cred->sgid = cred->fsgid = gid; |
541 | } else if ((gid == cred->gid) || (gid == cred->sgid)) { | |
756184b7 | 542 | if (old_egid != gid) { |
6c5d5238 | 543 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 544 | smp_wmb(); |
1da177e4 | 545 | } |
b6dff3ec | 546 | cred->egid = cred->fsgid = gid; |
1da177e4 LT |
547 | } |
548 | else | |
549 | return -EPERM; | |
550 | ||
551 | key_fsgid_changed(current); | |
9f46080c | 552 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
553 | return 0; |
554 | } | |
555 | ||
556 | static int set_user(uid_t new_ruid, int dumpclear) | |
557 | { | |
558 | struct user_struct *new_user; | |
559 | ||
acce292c | 560 | new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); |
1da177e4 LT |
561 | if (!new_user) |
562 | return -EAGAIN; | |
563 | ||
564 | if (atomic_read(&new_user->processes) >= | |
565 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
acce292c | 566 | new_user != current->nsproxy->user_ns->root_user) { |
1da177e4 LT |
567 | free_uid(new_user); |
568 | return -EAGAIN; | |
569 | } | |
570 | ||
571 | switch_uid(new_user); | |
572 | ||
756184b7 | 573 | if (dumpclear) { |
6c5d5238 | 574 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 575 | smp_wmb(); |
1da177e4 | 576 | } |
b6dff3ec | 577 | current->cred->uid = new_ruid; |
1da177e4 LT |
578 | return 0; |
579 | } | |
580 | ||
581 | /* | |
582 | * Unprivileged users may change the real uid to the effective uid | |
583 | * or vice versa. (BSD-style) | |
584 | * | |
585 | * If you set the real uid at all, or set the effective uid to a value not | |
586 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
587 | * | |
588 | * This makes it possible for a setuid program to completely drop its | |
589 | * privileges, which is often a useful assertion to make when you are doing | |
590 | * a security audit over a program. | |
591 | * | |
592 | * The general idea is that a program which uses just setreuid() will be | |
593 | * 100% compatible with BSD. A program which uses just setuid() will be | |
594 | * 100% compatible with POSIX with saved IDs. | |
595 | */ | |
596 | asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) | |
597 | { | |
b6dff3ec | 598 | struct cred *cred = current->cred; |
1da177e4 LT |
599 | int old_ruid, old_euid, old_suid, new_ruid, new_euid; |
600 | int retval; | |
601 | ||
602 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); | |
603 | if (retval) | |
604 | return retval; | |
605 | ||
b6dff3ec DH |
606 | new_ruid = old_ruid = cred->uid; |
607 | new_euid = old_euid = cred->euid; | |
608 | old_suid = cred->suid; | |
1da177e4 LT |
609 | |
610 | if (ruid != (uid_t) -1) { | |
611 | new_ruid = ruid; | |
612 | if ((old_ruid != ruid) && | |
b6dff3ec | 613 | (cred->euid != ruid) && |
1da177e4 LT |
614 | !capable(CAP_SETUID)) |
615 | return -EPERM; | |
616 | } | |
617 | ||
618 | if (euid != (uid_t) -1) { | |
619 | new_euid = euid; | |
620 | if ((old_ruid != euid) && | |
b6dff3ec DH |
621 | (cred->euid != euid) && |
622 | (cred->suid != euid) && | |
1da177e4 LT |
623 | !capable(CAP_SETUID)) |
624 | return -EPERM; | |
625 | } | |
626 | ||
627 | if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) | |
628 | return -EAGAIN; | |
629 | ||
756184b7 | 630 | if (new_euid != old_euid) { |
6c5d5238 | 631 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 632 | smp_wmb(); |
1da177e4 | 633 | } |
b6dff3ec | 634 | cred->fsuid = cred->euid = new_euid; |
1da177e4 LT |
635 | if (ruid != (uid_t) -1 || |
636 | (euid != (uid_t) -1 && euid != old_ruid)) | |
b6dff3ec DH |
637 | cred->suid = cred->euid; |
638 | cred->fsuid = cred->euid; | |
1da177e4 LT |
639 | |
640 | key_fsuid_changed(current); | |
9f46080c | 641 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
642 | |
643 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); | |
644 | } | |
645 | ||
646 | ||
647 | ||
648 | /* | |
649 | * setuid() is implemented like SysV with SAVED_IDS | |
650 | * | |
651 | * Note that SAVED_ID's is deficient in that a setuid root program | |
652 | * like sendmail, for example, cannot set its uid to be a normal | |
653 | * user and then switch back, because if you're root, setuid() sets | |
654 | * the saved uid too. If you don't like this, blame the bright people | |
655 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
656 | * will allow a root program to temporarily drop privileges and be able to | |
657 | * regain them by swapping the real and effective uid. | |
658 | */ | |
659 | asmlinkage long sys_setuid(uid_t uid) | |
660 | { | |
b6dff3ec DH |
661 | struct cred *cred = current->cred; |
662 | int old_euid = cred->euid; | |
a09c17a6 | 663 | int old_ruid, old_suid, new_suid; |
1da177e4 LT |
664 | int retval; |
665 | ||
666 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); | |
667 | if (retval) | |
668 | return retval; | |
669 | ||
b6dff3ec DH |
670 | old_ruid = cred->uid; |
671 | old_suid = cred->suid; | |
1da177e4 LT |
672 | new_suid = old_suid; |
673 | ||
674 | if (capable(CAP_SETUID)) { | |
675 | if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) | |
676 | return -EAGAIN; | |
677 | new_suid = uid; | |
b6dff3ec | 678 | } else if ((uid != cred->uid) && (uid != new_suid)) |
1da177e4 LT |
679 | return -EPERM; |
680 | ||
756184b7 | 681 | if (old_euid != uid) { |
6c5d5238 | 682 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 683 | smp_wmb(); |
1da177e4 | 684 | } |
b6dff3ec DH |
685 | cred->fsuid = cred->euid = uid; |
686 | cred->suid = new_suid; | |
1da177e4 LT |
687 | |
688 | key_fsuid_changed(current); | |
9f46080c | 689 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
690 | |
691 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); | |
692 | } | |
693 | ||
694 | ||
695 | /* | |
696 | * This function implements a generic ability to update ruid, euid, | |
697 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
698 | */ | |
699 | asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) | |
700 | { | |
b6dff3ec DH |
701 | struct cred *cred = current->cred; |
702 | int old_ruid = cred->uid; | |
703 | int old_euid = cred->euid; | |
704 | int old_suid = cred->suid; | |
1da177e4 LT |
705 | int retval; |
706 | ||
707 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); | |
708 | if (retval) | |
709 | return retval; | |
710 | ||
711 | if (!capable(CAP_SETUID)) { | |
b6dff3ec DH |
712 | if ((ruid != (uid_t) -1) && (ruid != cred->uid) && |
713 | (ruid != cred->euid) && (ruid != cred->suid)) | |
1da177e4 | 714 | return -EPERM; |
b6dff3ec DH |
715 | if ((euid != (uid_t) -1) && (euid != cred->uid) && |
716 | (euid != cred->euid) && (euid != cred->suid)) | |
1da177e4 | 717 | return -EPERM; |
b6dff3ec DH |
718 | if ((suid != (uid_t) -1) && (suid != cred->uid) && |
719 | (suid != cred->euid) && (suid != cred->suid)) | |
1da177e4 LT |
720 | return -EPERM; |
721 | } | |
722 | if (ruid != (uid_t) -1) { | |
b6dff3ec DH |
723 | if (ruid != cred->uid && |
724 | set_user(ruid, euid != cred->euid) < 0) | |
1da177e4 LT |
725 | return -EAGAIN; |
726 | } | |
727 | if (euid != (uid_t) -1) { | |
b6dff3ec | 728 | if (euid != cred->euid) { |
6c5d5238 | 729 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 730 | smp_wmb(); |
1da177e4 | 731 | } |
b6dff3ec | 732 | cred->euid = euid; |
1da177e4 | 733 | } |
b6dff3ec | 734 | cred->fsuid = cred->euid; |
1da177e4 | 735 | if (suid != (uid_t) -1) |
b6dff3ec | 736 | cred->suid = suid; |
1da177e4 LT |
737 | |
738 | key_fsuid_changed(current); | |
9f46080c | 739 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
740 | |
741 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); | |
742 | } | |
743 | ||
744 | asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) | |
745 | { | |
b6dff3ec | 746 | struct cred *cred = current->cred; |
1da177e4 LT |
747 | int retval; |
748 | ||
b6dff3ec DH |
749 | if (!(retval = put_user(cred->uid, ruid)) && |
750 | !(retval = put_user(cred->euid, euid))) | |
751 | retval = put_user(cred->suid, suid); | |
1da177e4 LT |
752 | |
753 | return retval; | |
754 | } | |
755 | ||
756 | /* | |
757 | * Same as above, but for rgid, egid, sgid. | |
758 | */ | |
759 | asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) | |
760 | { | |
b6dff3ec | 761 | struct cred *cred = current->cred; |
1da177e4 LT |
762 | int retval; |
763 | ||
764 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); | |
765 | if (retval) | |
766 | return retval; | |
767 | ||
768 | if (!capable(CAP_SETGID)) { | |
b6dff3ec DH |
769 | if ((rgid != (gid_t) -1) && (rgid != cred->gid) && |
770 | (rgid != cred->egid) && (rgid != cred->sgid)) | |
1da177e4 | 771 | return -EPERM; |
b6dff3ec DH |
772 | if ((egid != (gid_t) -1) && (egid != cred->gid) && |
773 | (egid != cred->egid) && (egid != cred->sgid)) | |
1da177e4 | 774 | return -EPERM; |
b6dff3ec DH |
775 | if ((sgid != (gid_t) -1) && (sgid != cred->gid) && |
776 | (sgid != cred->egid) && (sgid != cred->sgid)) | |
1da177e4 LT |
777 | return -EPERM; |
778 | } | |
779 | if (egid != (gid_t) -1) { | |
b6dff3ec | 780 | if (egid != cred->egid) { |
6c5d5238 | 781 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 782 | smp_wmb(); |
1da177e4 | 783 | } |
b6dff3ec | 784 | cred->egid = egid; |
1da177e4 | 785 | } |
b6dff3ec | 786 | cred->fsgid = cred->egid; |
1da177e4 | 787 | if (rgid != (gid_t) -1) |
b6dff3ec | 788 | cred->gid = rgid; |
1da177e4 | 789 | if (sgid != (gid_t) -1) |
b6dff3ec | 790 | cred->sgid = sgid; |
1da177e4 LT |
791 | |
792 | key_fsgid_changed(current); | |
9f46080c | 793 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
794 | return 0; |
795 | } | |
796 | ||
797 | asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) | |
798 | { | |
b6dff3ec | 799 | struct cred *cred = current->cred; |
1da177e4 LT |
800 | int retval; |
801 | ||
b6dff3ec DH |
802 | if (!(retval = put_user(cred->gid, rgid)) && |
803 | !(retval = put_user(cred->egid, egid))) | |
804 | retval = put_user(cred->sgid, sgid); | |
1da177e4 LT |
805 | |
806 | return retval; | |
807 | } | |
808 | ||
809 | ||
810 | /* | |
811 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
812 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
813 | * whatever uid it wants to). It normally shadows "euid", except when | |
814 | * explicitly set by setfsuid() or for access.. | |
815 | */ | |
816 | asmlinkage long sys_setfsuid(uid_t uid) | |
817 | { | |
b6dff3ec | 818 | struct cred *cred = current->cred; |
1da177e4 LT |
819 | int old_fsuid; |
820 | ||
b6dff3ec | 821 | old_fsuid = cred->fsuid; |
1da177e4 LT |
822 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) |
823 | return old_fsuid; | |
824 | ||
b6dff3ec DH |
825 | if (uid == cred->uid || uid == cred->euid || |
826 | uid == cred->suid || uid == cred->fsuid || | |
756184b7 CP |
827 | capable(CAP_SETUID)) { |
828 | if (uid != old_fsuid) { | |
6c5d5238 | 829 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 830 | smp_wmb(); |
1da177e4 | 831 | } |
b6dff3ec | 832 | cred->fsuid = uid; |
1da177e4 LT |
833 | } |
834 | ||
835 | key_fsuid_changed(current); | |
9f46080c | 836 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
837 | |
838 | security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); | |
839 | ||
840 | return old_fsuid; | |
841 | } | |
842 | ||
843 | /* | |
f42df9e6 | 844 | * Samma på svenska.. |
1da177e4 LT |
845 | */ |
846 | asmlinkage long sys_setfsgid(gid_t gid) | |
847 | { | |
b6dff3ec | 848 | struct cred *cred = current->cred; |
1da177e4 LT |
849 | int old_fsgid; |
850 | ||
b6dff3ec | 851 | old_fsgid = cred->fsgid; |
1da177e4 LT |
852 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) |
853 | return old_fsgid; | |
854 | ||
b6dff3ec DH |
855 | if (gid == cred->gid || gid == cred->egid || |
856 | gid == cred->sgid || gid == cred->fsgid || | |
756184b7 CP |
857 | capable(CAP_SETGID)) { |
858 | if (gid != old_fsgid) { | |
6c5d5238 | 859 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 860 | smp_wmb(); |
1da177e4 | 861 | } |
b6dff3ec | 862 | cred->fsgid = gid; |
1da177e4 | 863 | key_fsgid_changed(current); |
9f46080c | 864 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
865 | } |
866 | return old_fsgid; | |
867 | } | |
868 | ||
f06febc9 FM |
869 | void do_sys_times(struct tms *tms) |
870 | { | |
871 | struct task_cputime cputime; | |
872 | cputime_t cutime, cstime; | |
873 | ||
874 | spin_lock_irq(¤t->sighand->siglock); | |
875 | thread_group_cputime(current, &cputime); | |
876 | cutime = current->signal->cutime; | |
877 | cstime = current->signal->cstime; | |
878 | spin_unlock_irq(¤t->sighand->siglock); | |
879 | tms->tms_utime = cputime_to_clock_t(cputime.utime); | |
880 | tms->tms_stime = cputime_to_clock_t(cputime.stime); | |
881 | tms->tms_cutime = cputime_to_clock_t(cutime); | |
882 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
883 | } | |
884 | ||
1da177e4 LT |
885 | asmlinkage long sys_times(struct tms __user * tbuf) |
886 | { | |
1da177e4 LT |
887 | if (tbuf) { |
888 | struct tms tmp; | |
f06febc9 FM |
889 | |
890 | do_sys_times(&tmp); | |
1da177e4 LT |
891 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
892 | return -EFAULT; | |
893 | } | |
894 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); | |
895 | } | |
896 | ||
897 | /* | |
898 | * This needs some heavy checking ... | |
899 | * I just haven't the stomach for it. I also don't fully | |
900 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
901 | * | |
902 | * OK, I think I have the protection semantics right.... this is really | |
903 | * only important on a multi-user system anyway, to make sure one user | |
904 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
905 | * | |
906 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
907 | * LBT 04.03.94 | |
908 | */ | |
1da177e4 LT |
909 | asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) |
910 | { | |
911 | struct task_struct *p; | |
ee0acf90 | 912 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
913 | struct pid *pgrp; |
914 | int err; | |
1da177e4 LT |
915 | |
916 | if (!pid) | |
b488893a | 917 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
918 | if (!pgid) |
919 | pgid = pid; | |
920 | if (pgid < 0) | |
921 | return -EINVAL; | |
922 | ||
923 | /* From this point forward we keep holding onto the tasklist lock | |
924 | * so that our parent does not change from under us. -DaveM | |
925 | */ | |
926 | write_lock_irq(&tasklist_lock); | |
927 | ||
928 | err = -ESRCH; | |
4e021306 | 929 | p = find_task_by_vpid(pid); |
1da177e4 LT |
930 | if (!p) |
931 | goto out; | |
932 | ||
933 | err = -EINVAL; | |
934 | if (!thread_group_leader(p)) | |
935 | goto out; | |
936 | ||
4e021306 | 937 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 938 | err = -EPERM; |
41487c65 | 939 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
940 | goto out; |
941 | err = -EACCES; | |
942 | if (p->did_exec) | |
943 | goto out; | |
944 | } else { | |
945 | err = -ESRCH; | |
ee0acf90 | 946 | if (p != group_leader) |
1da177e4 LT |
947 | goto out; |
948 | } | |
949 | ||
950 | err = -EPERM; | |
951 | if (p->signal->leader) | |
952 | goto out; | |
953 | ||
4e021306 | 954 | pgrp = task_pid(p); |
1da177e4 | 955 | if (pgid != pid) { |
b488893a | 956 | struct task_struct *g; |
1da177e4 | 957 | |
4e021306 ON |
958 | pgrp = find_vpid(pgid); |
959 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 960 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 961 | goto out; |
1da177e4 LT |
962 | } |
963 | ||
1da177e4 LT |
964 | err = security_task_setpgid(p, pgid); |
965 | if (err) | |
966 | goto out; | |
967 | ||
4e021306 | 968 | if (task_pgrp(p) != pgrp) { |
83beaf3c | 969 | change_pid(p, PIDTYPE_PGID, pgrp); |
4e021306 | 970 | set_task_pgrp(p, pid_nr(pgrp)); |
1da177e4 LT |
971 | } |
972 | ||
973 | err = 0; | |
974 | out: | |
975 | /* All paths lead to here, thus we are safe. -DaveM */ | |
976 | write_unlock_irq(&tasklist_lock); | |
977 | return err; | |
978 | } | |
979 | ||
980 | asmlinkage long sys_getpgid(pid_t pid) | |
981 | { | |
12a3de0a ON |
982 | struct task_struct *p; |
983 | struct pid *grp; | |
984 | int retval; | |
985 | ||
986 | rcu_read_lock(); | |
756184b7 | 987 | if (!pid) |
12a3de0a | 988 | grp = task_pgrp(current); |
756184b7 | 989 | else { |
1da177e4 | 990 | retval = -ESRCH; |
12a3de0a ON |
991 | p = find_task_by_vpid(pid); |
992 | if (!p) | |
993 | goto out; | |
994 | grp = task_pgrp(p); | |
995 | if (!grp) | |
996 | goto out; | |
997 | ||
998 | retval = security_task_getpgid(p); | |
999 | if (retval) | |
1000 | goto out; | |
1da177e4 | 1001 | } |
12a3de0a ON |
1002 | retval = pid_vnr(grp); |
1003 | out: | |
1004 | rcu_read_unlock(); | |
1005 | return retval; | |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1009 | ||
1010 | asmlinkage long sys_getpgrp(void) | |
1011 | { | |
12a3de0a | 1012 | return sys_getpgid(0); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | #endif | |
1016 | ||
1017 | asmlinkage long sys_getsid(pid_t pid) | |
1018 | { | |
1dd768c0 ON |
1019 | struct task_struct *p; |
1020 | struct pid *sid; | |
1021 | int retval; | |
1022 | ||
1023 | rcu_read_lock(); | |
756184b7 | 1024 | if (!pid) |
1dd768c0 | 1025 | sid = task_session(current); |
756184b7 | 1026 | else { |
1da177e4 | 1027 | retval = -ESRCH; |
1dd768c0 ON |
1028 | p = find_task_by_vpid(pid); |
1029 | if (!p) | |
1030 | goto out; | |
1031 | sid = task_session(p); | |
1032 | if (!sid) | |
1033 | goto out; | |
1034 | ||
1035 | retval = security_task_getsid(p); | |
1036 | if (retval) | |
1037 | goto out; | |
1da177e4 | 1038 | } |
1dd768c0 ON |
1039 | retval = pid_vnr(sid); |
1040 | out: | |
1041 | rcu_read_unlock(); | |
1042 | return retval; | |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | asmlinkage long sys_setsid(void) | |
1046 | { | |
e19f247a | 1047 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1048 | struct pid *sid = task_pid(group_leader); |
1049 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1050 | int err = -EPERM; |
1051 | ||
1da177e4 | 1052 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1053 | /* Fail if I am already a session leader */ |
1054 | if (group_leader->signal->leader) | |
1055 | goto out; | |
1056 | ||
430c6231 ON |
1057 | /* Fail if a process group id already exists that equals the |
1058 | * proposed session id. | |
390e2ff0 | 1059 | */ |
6806aac6 | 1060 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1061 | goto out; |
1062 | ||
e19f247a | 1063 | group_leader->signal->leader = 1; |
8520d7c7 | 1064 | __set_special_pids(sid); |
24ec839c | 1065 | |
9c9f4ded | 1066 | proc_clear_tty(group_leader); |
24ec839c | 1067 | |
e4cc0a9c | 1068 | err = session; |
1da177e4 LT |
1069 | out: |
1070 | write_unlock_irq(&tasklist_lock); | |
1da177e4 LT |
1071 | return err; |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Supplementary group IDs | |
1076 | */ | |
1077 | ||
1078 | /* init to 2 - one for init_task, one to ensure it is never freed */ | |
1079 | struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; | |
1080 | ||
1081 | struct group_info *groups_alloc(int gidsetsize) | |
1082 | { | |
1083 | struct group_info *group_info; | |
1084 | int nblocks; | |
1085 | int i; | |
1086 | ||
1087 | nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK; | |
1088 | /* Make sure we always allocate at least one indirect block pointer */ | |
1089 | nblocks = nblocks ? : 1; | |
1090 | group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER); | |
1091 | if (!group_info) | |
1092 | return NULL; | |
1093 | group_info->ngroups = gidsetsize; | |
1094 | group_info->nblocks = nblocks; | |
1095 | atomic_set(&group_info->usage, 1); | |
1096 | ||
756184b7 | 1097 | if (gidsetsize <= NGROUPS_SMALL) |
1da177e4 | 1098 | group_info->blocks[0] = group_info->small_block; |
756184b7 | 1099 | else { |
1da177e4 LT |
1100 | for (i = 0; i < nblocks; i++) { |
1101 | gid_t *b; | |
1102 | b = (void *)__get_free_page(GFP_USER); | |
1103 | if (!b) | |
1104 | goto out_undo_partial_alloc; | |
1105 | group_info->blocks[i] = b; | |
1106 | } | |
1107 | } | |
1108 | return group_info; | |
1109 | ||
1110 | out_undo_partial_alloc: | |
1111 | while (--i >= 0) { | |
1112 | free_page((unsigned long)group_info->blocks[i]); | |
1113 | } | |
1114 | kfree(group_info); | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | EXPORT_SYMBOL(groups_alloc); | |
1119 | ||
1120 | void groups_free(struct group_info *group_info) | |
1121 | { | |
1122 | if (group_info->blocks[0] != group_info->small_block) { | |
1123 | int i; | |
1124 | for (i = 0; i < group_info->nblocks; i++) | |
1125 | free_page((unsigned long)group_info->blocks[i]); | |
1126 | } | |
1127 | kfree(group_info); | |
1128 | } | |
1129 | ||
1130 | EXPORT_SYMBOL(groups_free); | |
1131 | ||
1132 | /* export the group_info to a user-space array */ | |
1133 | static int groups_to_user(gid_t __user *grouplist, | |
1134 | struct group_info *group_info) | |
1135 | { | |
1136 | int i; | |
1bf47346 | 1137 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1138 | |
1139 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1140 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1141 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1142 | |
1bf47346 | 1143 | if (copy_to_user(grouplist, group_info->blocks[i], len)) |
1da177e4 LT |
1144 | return -EFAULT; |
1145 | ||
1bf47346 | 1146 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1147 | count -= cp_count; |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | /* fill a group_info from a user-space array - it must be allocated already */ | |
1153 | static int groups_from_user(struct group_info *group_info, | |
1154 | gid_t __user *grouplist) | |
756184b7 | 1155 | { |
1da177e4 | 1156 | int i; |
1bf47346 | 1157 | unsigned int count = group_info->ngroups; |
1da177e4 LT |
1158 | |
1159 | for (i = 0; i < group_info->nblocks; i++) { | |
1bf47346 ED |
1160 | unsigned int cp_count = min(NGROUPS_PER_BLOCK, count); |
1161 | unsigned int len = cp_count * sizeof(*grouplist); | |
1da177e4 | 1162 | |
1bf47346 | 1163 | if (copy_from_user(group_info->blocks[i], grouplist, len)) |
1da177e4 LT |
1164 | return -EFAULT; |
1165 | ||
1bf47346 | 1166 | grouplist += NGROUPS_PER_BLOCK; |
1da177e4 LT |
1167 | count -= cp_count; |
1168 | } | |
1169 | return 0; | |
1170 | } | |
1171 | ||
ebe8b541 | 1172 | /* a simple Shell sort */ |
1da177e4 LT |
1173 | static void groups_sort(struct group_info *group_info) |
1174 | { | |
1175 | int base, max, stride; | |
1176 | int gidsetsize = group_info->ngroups; | |
1177 | ||
1178 | for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1) | |
1179 | ; /* nothing */ | |
1180 | stride /= 3; | |
1181 | ||
1182 | while (stride) { | |
1183 | max = gidsetsize - stride; | |
1184 | for (base = 0; base < max; base++) { | |
1185 | int left = base; | |
1186 | int right = left + stride; | |
1187 | gid_t tmp = GROUP_AT(group_info, right); | |
1188 | ||
1189 | while (left >= 0 && GROUP_AT(group_info, left) > tmp) { | |
1190 | GROUP_AT(group_info, right) = | |
1191 | GROUP_AT(group_info, left); | |
1192 | right = left; | |
1193 | left -= stride; | |
1194 | } | |
1195 | GROUP_AT(group_info, right) = tmp; | |
1196 | } | |
1197 | stride /= 3; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* a simple bsearch */ | |
3e30148c | 1202 | int groups_search(struct group_info *group_info, gid_t grp) |
1da177e4 | 1203 | { |
d74beb9f | 1204 | unsigned int left, right; |
1da177e4 LT |
1205 | |
1206 | if (!group_info) | |
1207 | return 0; | |
1208 | ||
1209 | left = 0; | |
1210 | right = group_info->ngroups; | |
1211 | while (left < right) { | |
d74beb9f | 1212 | unsigned int mid = (left+right)/2; |
1da177e4 LT |
1213 | int cmp = grp - GROUP_AT(group_info, mid); |
1214 | if (cmp > 0) | |
1215 | left = mid + 1; | |
1216 | else if (cmp < 0) | |
1217 | right = mid; | |
1218 | else | |
1219 | return 1; | |
1220 | } | |
1221 | return 0; | |
1222 | } | |
1223 | ||
b6dff3ec DH |
1224 | /** |
1225 | * set_groups - Change a group subscription in a security record | |
1226 | * @sec: The security record to alter | |
1227 | * @group_info: The group list to impose | |
1228 | * | |
1229 | * Validate a group subscription and, if valid, impose it upon a task security | |
1230 | * record. | |
1231 | */ | |
1232 | int set_groups(struct cred *cred, struct group_info *group_info) | |
1da177e4 LT |
1233 | { |
1234 | int retval; | |
1235 | struct group_info *old_info; | |
1236 | ||
1237 | retval = security_task_setgroups(group_info); | |
1238 | if (retval) | |
1239 | return retval; | |
1240 | ||
1241 | groups_sort(group_info); | |
1242 | get_group_info(group_info); | |
1243 | ||
b6dff3ec DH |
1244 | spin_lock(&cred->lock); |
1245 | old_info = cred->group_info; | |
1246 | cred->group_info = group_info; | |
1247 | spin_unlock(&cred->lock); | |
1da177e4 LT |
1248 | |
1249 | put_group_info(old_info); | |
1da177e4 LT |
1250 | return 0; |
1251 | } | |
1252 | ||
b6dff3ec DH |
1253 | EXPORT_SYMBOL(set_groups); |
1254 | ||
1255 | /** | |
1256 | * set_current_groups - Change current's group subscription | |
1257 | * @group_info: The group list to impose | |
1258 | * | |
1259 | * Validate a group subscription and, if valid, impose it upon current's task | |
1260 | * security record. | |
1261 | */ | |
1262 | int set_current_groups(struct group_info *group_info) | |
1263 | { | |
1264 | return set_groups(current->cred, group_info); | |
1265 | } | |
1266 | ||
1da177e4 LT |
1267 | EXPORT_SYMBOL(set_current_groups); |
1268 | ||
1269 | asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) | |
1270 | { | |
b6dff3ec | 1271 | struct cred *cred = current->cred; |
1da177e4 LT |
1272 | int i = 0; |
1273 | ||
1274 | /* | |
1275 | * SMP: Nobody else can change our grouplist. Thus we are | |
1276 | * safe. | |
1277 | */ | |
1278 | ||
1279 | if (gidsetsize < 0) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | /* no need to grab task_lock here; it cannot change */ | |
b6dff3ec | 1283 | i = cred->group_info->ngroups; |
1da177e4 LT |
1284 | if (gidsetsize) { |
1285 | if (i > gidsetsize) { | |
1286 | i = -EINVAL; | |
1287 | goto out; | |
1288 | } | |
b6dff3ec | 1289 | if (groups_to_user(grouplist, cred->group_info)) { |
1da177e4 LT |
1290 | i = -EFAULT; |
1291 | goto out; | |
1292 | } | |
1293 | } | |
1294 | out: | |
1da177e4 LT |
1295 | return i; |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * SMP: Our groups are copy-on-write. We can set them safely | |
1300 | * without another task interfering. | |
1301 | */ | |
1302 | ||
1303 | asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist) | |
1304 | { | |
1305 | struct group_info *group_info; | |
1306 | int retval; | |
1307 | ||
1308 | if (!capable(CAP_SETGID)) | |
1309 | return -EPERM; | |
1310 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
1311 | return -EINVAL; | |
1312 | ||
1313 | group_info = groups_alloc(gidsetsize); | |
1314 | if (!group_info) | |
1315 | return -ENOMEM; | |
1316 | retval = groups_from_user(group_info, grouplist); | |
1317 | if (retval) { | |
1318 | put_group_info(group_info); | |
1319 | return retval; | |
1320 | } | |
1321 | ||
1322 | retval = set_current_groups(group_info); | |
1323 | put_group_info(group_info); | |
1324 | ||
1325 | return retval; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Check whether we're fsgid/egid or in the supplemental group.. | |
1330 | */ | |
1331 | int in_group_p(gid_t grp) | |
1332 | { | |
b6dff3ec | 1333 | struct cred *cred = current->cred; |
1da177e4 | 1334 | int retval = 1; |
b6dff3ec DH |
1335 | if (grp != cred->fsgid) |
1336 | retval = groups_search(cred->group_info, grp); | |
1da177e4 LT |
1337 | return retval; |
1338 | } | |
1339 | ||
1340 | EXPORT_SYMBOL(in_group_p); | |
1341 | ||
1342 | int in_egroup_p(gid_t grp) | |
1343 | { | |
b6dff3ec | 1344 | struct cred *cred = current->cred; |
1da177e4 | 1345 | int retval = 1; |
b6dff3ec DH |
1346 | if (grp != cred->egid) |
1347 | retval = groups_search(cred->group_info, grp); | |
1da177e4 LT |
1348 | return retval; |
1349 | } | |
1350 | ||
1351 | EXPORT_SYMBOL(in_egroup_p); | |
1352 | ||
1353 | DECLARE_RWSEM(uts_sem); | |
1354 | ||
1da177e4 LT |
1355 | asmlinkage long sys_newuname(struct new_utsname __user * name) |
1356 | { | |
1357 | int errno = 0; | |
1358 | ||
1359 | down_read(&uts_sem); | |
e9ff3990 | 1360 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1361 | errno = -EFAULT; |
1362 | up_read(&uts_sem); | |
1363 | return errno; | |
1364 | } | |
1365 | ||
1366 | asmlinkage long sys_sethostname(char __user *name, int len) | |
1367 | { | |
1368 | int errno; | |
1369 | char tmp[__NEW_UTS_LEN]; | |
1370 | ||
1371 | if (!capable(CAP_SYS_ADMIN)) | |
1372 | return -EPERM; | |
1373 | if (len < 0 || len > __NEW_UTS_LEN) | |
1374 | return -EINVAL; | |
1375 | down_write(&uts_sem); | |
1376 | errno = -EFAULT; | |
1377 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1378 | struct new_utsname *u = utsname(); |
1379 | ||
1380 | memcpy(u->nodename, tmp, len); | |
1381 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 LT |
1382 | errno = 0; |
1383 | } | |
1384 | up_write(&uts_sem); | |
1385 | return errno; | |
1386 | } | |
1387 | ||
1388 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1389 | ||
1390 | asmlinkage long sys_gethostname(char __user *name, int len) | |
1391 | { | |
1392 | int i, errno; | |
9679e4dd | 1393 | struct new_utsname *u; |
1da177e4 LT |
1394 | |
1395 | if (len < 0) | |
1396 | return -EINVAL; | |
1397 | down_read(&uts_sem); | |
9679e4dd AM |
1398 | u = utsname(); |
1399 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1400 | if (i > len) |
1401 | i = len; | |
1402 | errno = 0; | |
9679e4dd | 1403 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1404 | errno = -EFAULT; |
1405 | up_read(&uts_sem); | |
1406 | return errno; | |
1407 | } | |
1408 | ||
1409 | #endif | |
1410 | ||
1411 | /* | |
1412 | * Only setdomainname; getdomainname can be implemented by calling | |
1413 | * uname() | |
1414 | */ | |
1415 | asmlinkage long sys_setdomainname(char __user *name, int len) | |
1416 | { | |
1417 | int errno; | |
1418 | char tmp[__NEW_UTS_LEN]; | |
1419 | ||
1420 | if (!capable(CAP_SYS_ADMIN)) | |
1421 | return -EPERM; | |
1422 | if (len < 0 || len > __NEW_UTS_LEN) | |
1423 | return -EINVAL; | |
1424 | ||
1425 | down_write(&uts_sem); | |
1426 | errno = -EFAULT; | |
1427 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1428 | struct new_utsname *u = utsname(); |
1429 | ||
1430 | memcpy(u->domainname, tmp, len); | |
1431 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 LT |
1432 | errno = 0; |
1433 | } | |
1434 | up_write(&uts_sem); | |
1435 | return errno; | |
1436 | } | |
1437 | ||
1438 | asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1439 | { | |
1440 | if (resource >= RLIM_NLIMITS) | |
1441 | return -EINVAL; | |
1442 | else { | |
1443 | struct rlimit value; | |
1444 | task_lock(current->group_leader); | |
1445 | value = current->signal->rlim[resource]; | |
1446 | task_unlock(current->group_leader); | |
1447 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1452 | ||
1453 | /* | |
1454 | * Back compatibility for getrlimit. Needed for some apps. | |
1455 | */ | |
1456 | ||
1457 | asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1458 | { | |
1459 | struct rlimit x; | |
1460 | if (resource >= RLIM_NLIMITS) | |
1461 | return -EINVAL; | |
1462 | ||
1463 | task_lock(current->group_leader); | |
1464 | x = current->signal->rlim[resource]; | |
1465 | task_unlock(current->group_leader); | |
756184b7 | 1466 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1467 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1468 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1469 | x.rlim_max = 0x7FFFFFFF; |
1470 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1471 | } | |
1472 | ||
1473 | #endif | |
1474 | ||
1475 | asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1476 | { | |
1477 | struct rlimit new_rlim, *old_rlim; | |
1478 | int retval; | |
1479 | ||
1480 | if (resource >= RLIM_NLIMITS) | |
1481 | return -EINVAL; | |
ec9e16ba | 1482 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1483 | return -EFAULT; |
1da177e4 LT |
1484 | old_rlim = current->signal->rlim + resource; |
1485 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1486 | !capable(CAP_SYS_RESOURCE)) | |
1487 | return -EPERM; | |
0c2d64fb AT |
1488 | |
1489 | if (resource == RLIMIT_NOFILE) { | |
1490 | if (new_rlim.rlim_max == RLIM_INFINITY) | |
1491 | new_rlim.rlim_max = sysctl_nr_open; | |
1492 | if (new_rlim.rlim_cur == RLIM_INFINITY) | |
1493 | new_rlim.rlim_cur = sysctl_nr_open; | |
1494 | if (new_rlim.rlim_max > sysctl_nr_open) | |
1495 | return -EPERM; | |
1496 | } | |
1497 | ||
1498 | if (new_rlim.rlim_cur > new_rlim.rlim_max) | |
1499 | return -EINVAL; | |
1da177e4 LT |
1500 | |
1501 | retval = security_task_setrlimit(resource, &new_rlim); | |
1502 | if (retval) | |
1503 | return retval; | |
1504 | ||
9926e4c7 TA |
1505 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1506 | /* | |
1507 | * The caller is asking for an immediate RLIMIT_CPU | |
1508 | * expiry. But we use the zero value to mean "it was | |
1509 | * never set". So let's cheat and make it one second | |
1510 | * instead | |
1511 | */ | |
1512 | new_rlim.rlim_cur = 1; | |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | task_lock(current->group_leader); |
1516 | *old_rlim = new_rlim; | |
1517 | task_unlock(current->group_leader); | |
1518 | ||
ec9e16ba AM |
1519 | if (resource != RLIMIT_CPU) |
1520 | goto out; | |
d3561f78 AM |
1521 | |
1522 | /* | |
1523 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1524 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1525 | * very long-standing error, and fixing it now risks breakage of | |
1526 | * applications, so we live with it | |
1527 | */ | |
ec9e16ba AM |
1528 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1529 | goto out; | |
1530 | ||
f06febc9 | 1531 | update_rlimit_cpu(new_rlim.rlim_cur); |
ec9e16ba | 1532 | out: |
1da177e4 LT |
1533 | return 0; |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * It would make sense to put struct rusage in the task_struct, | |
1538 | * except that would make the task_struct be *really big*. After | |
1539 | * task_struct gets moved into malloc'ed memory, it would | |
1540 | * make sense to do this. It will make moving the rest of the information | |
1541 | * a lot simpler! (Which we're not doing right now because we're not | |
1542 | * measuring them yet). | |
1543 | * | |
1da177e4 LT |
1544 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1545 | * races with threads incrementing their own counters. But since word | |
1546 | * reads are atomic, we either get new values or old values and we don't | |
1547 | * care which for the sums. We always take the siglock to protect reading | |
1548 | * the c* fields from p->signal from races with exit.c updating those | |
1549 | * fields when reaping, so a sample either gets all the additions of a | |
1550 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1551 | * |
de047c1b RT |
1552 | * Locking: |
1553 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1554 | * for the cases current multithreaded, non-current single threaded | |
1555 | * non-current multithreaded. Thread traversal is now safe with | |
1556 | * the siglock held. | |
1557 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1558 | * single threaded, as no one else can take our signal_struct away, no one | |
1559 | * else can reap the children to update signal->c* counters, and no one else | |
1560 | * can race with the signal-> fields. If we do not take any lock, the | |
1561 | * signal-> fields could be read out of order while another thread was just | |
1562 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1563 | * On the writer side, write memory barrier is implied in __exit_signal | |
1564 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1565 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1566 | * |
1da177e4 LT |
1567 | */ |
1568 | ||
f06febc9 | 1569 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1570 | { |
679c9cd4 SK |
1571 | r->ru_nvcsw += t->nvcsw; |
1572 | r->ru_nivcsw += t->nivcsw; | |
1573 | r->ru_minflt += t->min_flt; | |
1574 | r->ru_majflt += t->maj_flt; | |
1575 | r->ru_inblock += task_io_get_inblock(t); | |
1576 | r->ru_oublock += task_io_get_oublock(t); | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1580 | { | |
1581 | struct task_struct *t; | |
1582 | unsigned long flags; | |
1583 | cputime_t utime, stime; | |
f06febc9 | 1584 | struct task_cputime cputime; |
1da177e4 LT |
1585 | |
1586 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1587 | utime = stime = cputime_zero; |
1da177e4 | 1588 | |
679c9cd4 | 1589 | if (who == RUSAGE_THREAD) { |
f06febc9 | 1590 | accumulate_thread_rusage(p, r); |
679c9cd4 SK |
1591 | goto out; |
1592 | } | |
1593 | ||
d6cf723a | 1594 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1595 | return; |
0f59cc4a | 1596 | |
1da177e4 | 1597 | switch (who) { |
0f59cc4a | 1598 | case RUSAGE_BOTH: |
1da177e4 | 1599 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1600 | utime = p->signal->cutime; |
1601 | stime = p->signal->cstime; | |
1602 | r->ru_nvcsw = p->signal->cnvcsw; | |
1603 | r->ru_nivcsw = p->signal->cnivcsw; | |
1604 | r->ru_minflt = p->signal->cmin_flt; | |
1605 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1606 | r->ru_inblock = p->signal->cinblock; |
1607 | r->ru_oublock = p->signal->coublock; | |
0f59cc4a ON |
1608 | |
1609 | if (who == RUSAGE_CHILDREN) | |
1610 | break; | |
1611 | ||
1da177e4 | 1612 | case RUSAGE_SELF: |
f06febc9 FM |
1613 | thread_group_cputime(p, &cputime); |
1614 | utime = cputime_add(utime, cputime.utime); | |
1615 | stime = cputime_add(stime, cputime.stime); | |
1da177e4 LT |
1616 | r->ru_nvcsw += p->signal->nvcsw; |
1617 | r->ru_nivcsw += p->signal->nivcsw; | |
1618 | r->ru_minflt += p->signal->min_flt; | |
1619 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1620 | r->ru_inblock += p->signal->inblock; |
1621 | r->ru_oublock += p->signal->oublock; | |
1da177e4 LT |
1622 | t = p; |
1623 | do { | |
f06febc9 | 1624 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1625 | t = next_thread(t); |
1626 | } while (t != p); | |
1da177e4 | 1627 | break; |
0f59cc4a | 1628 | |
1da177e4 LT |
1629 | default: |
1630 | BUG(); | |
1631 | } | |
de047c1b | 1632 | unlock_task_sighand(p, &flags); |
de047c1b | 1633 | |
679c9cd4 | 1634 | out: |
0f59cc4a ON |
1635 | cputime_to_timeval(utime, &r->ru_utime); |
1636 | cputime_to_timeval(stime, &r->ru_stime); | |
1da177e4 LT |
1637 | } |
1638 | ||
1639 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1640 | { | |
1641 | struct rusage r; | |
1da177e4 | 1642 | k_getrusage(p, who, &r); |
1da177e4 LT |
1643 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1644 | } | |
1645 | ||
1646 | asmlinkage long sys_getrusage(int who, struct rusage __user *ru) | |
1647 | { | |
679c9cd4 SK |
1648 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1649 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1650 | return -EINVAL; |
1651 | return getrusage(current, who, ru); | |
1652 | } | |
1653 | ||
1654 | asmlinkage long sys_umask(int mask) | |
1655 | { | |
1656 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1657 | return mask; | |
1658 | } | |
3b7391de | 1659 | |
1da177e4 LT |
1660 | asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, |
1661 | unsigned long arg4, unsigned long arg5) | |
1662 | { | |
b6dff3ec DH |
1663 | struct task_struct *me = current; |
1664 | unsigned char comm[sizeof(me->comm)]; | |
1665 | long error; | |
1da177e4 | 1666 | |
3898b1b4 | 1667 | if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error)) |
1da177e4 LT |
1668 | return error; |
1669 | ||
1670 | switch (option) { | |
1671 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1672 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1673 | error = -EINVAL; |
1674 | break; | |
1675 | } | |
b6dff3ec DH |
1676 | me->pdeath_signal = arg2; |
1677 | error = 0; | |
1da177e4 LT |
1678 | break; |
1679 | case PR_GET_PDEATHSIG: | |
b6dff3ec | 1680 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
1da177e4 LT |
1681 | break; |
1682 | case PR_GET_DUMPABLE: | |
b6dff3ec | 1683 | error = get_dumpable(me->mm); |
1da177e4 LT |
1684 | break; |
1685 | case PR_SET_DUMPABLE: | |
abf75a50 | 1686 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1687 | error = -EINVAL; |
1688 | break; | |
1689 | } | |
b6dff3ec DH |
1690 | set_dumpable(me->mm, arg2); |
1691 | error = 0; | |
1da177e4 LT |
1692 | break; |
1693 | ||
1694 | case PR_SET_UNALIGN: | |
b6dff3ec | 1695 | error = SET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1696 | break; |
1697 | case PR_GET_UNALIGN: | |
b6dff3ec | 1698 | error = GET_UNALIGN_CTL(me, arg2); |
1da177e4 LT |
1699 | break; |
1700 | case PR_SET_FPEMU: | |
b6dff3ec | 1701 | error = SET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1702 | break; |
1703 | case PR_GET_FPEMU: | |
b6dff3ec | 1704 | error = GET_FPEMU_CTL(me, arg2); |
1da177e4 LT |
1705 | break; |
1706 | case PR_SET_FPEXC: | |
b6dff3ec | 1707 | error = SET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1708 | break; |
1709 | case PR_GET_FPEXC: | |
b6dff3ec | 1710 | error = GET_FPEXC_CTL(me, arg2); |
1da177e4 LT |
1711 | break; |
1712 | case PR_GET_TIMING: | |
1713 | error = PR_TIMING_STATISTICAL; | |
1714 | break; | |
1715 | case PR_SET_TIMING: | |
7b26655f | 1716 | if (arg2 != PR_TIMING_STATISTICAL) |
1da177e4 | 1717 | error = -EINVAL; |
b6dff3ec DH |
1718 | else |
1719 | error = 0; | |
1da177e4 LT |
1720 | break; |
1721 | ||
b6dff3ec DH |
1722 | case PR_SET_NAME: |
1723 | comm[sizeof(me->comm)-1] = 0; | |
1724 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1725 | sizeof(me->comm) - 1) < 0) | |
1da177e4 | 1726 | return -EFAULT; |
b6dff3ec | 1727 | set_task_comm(me, comm); |
1da177e4 | 1728 | return 0; |
b6dff3ec DH |
1729 | case PR_GET_NAME: |
1730 | get_task_comm(comm, me); | |
1731 | if (copy_to_user((char __user *)arg2, comm, | |
1732 | sizeof(comm))) | |
1da177e4 LT |
1733 | return -EFAULT; |
1734 | return 0; | |
651d765d | 1735 | case PR_GET_ENDIAN: |
b6dff3ec | 1736 | error = GET_ENDIAN(me, arg2); |
651d765d AB |
1737 | break; |
1738 | case PR_SET_ENDIAN: | |
b6dff3ec | 1739 | error = SET_ENDIAN(me, arg2); |
651d765d AB |
1740 | break; |
1741 | ||
1d9d02fe AA |
1742 | case PR_GET_SECCOMP: |
1743 | error = prctl_get_seccomp(); | |
1744 | break; | |
1745 | case PR_SET_SECCOMP: | |
1746 | error = prctl_set_seccomp(arg2); | |
1747 | break; | |
8fb402bc EB |
1748 | case PR_GET_TSC: |
1749 | error = GET_TSC_CTL(arg2); | |
1750 | break; | |
1751 | case PR_SET_TSC: | |
1752 | error = SET_TSC_CTL(arg2); | |
1753 | break; | |
6976675d AV |
1754 | case PR_GET_TIMERSLACK: |
1755 | error = current->timer_slack_ns; | |
1756 | break; | |
1757 | case PR_SET_TIMERSLACK: | |
1758 | if (arg2 <= 0) | |
1759 | current->timer_slack_ns = | |
1760 | current->default_timer_slack_ns; | |
1761 | else | |
1762 | current->timer_slack_ns = arg2; | |
b6dff3ec | 1763 | error = 0; |
6976675d | 1764 | break; |
1da177e4 LT |
1765 | default: |
1766 | error = -EINVAL; | |
1767 | break; | |
1768 | } | |
1769 | return error; | |
1770 | } | |
3cfc348b AK |
1771 | |
1772 | asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, | |
4307d1e5 | 1773 | struct getcpu_cache __user *unused) |
3cfc348b AK |
1774 | { |
1775 | int err = 0; | |
1776 | int cpu = raw_smp_processor_id(); | |
1777 | if (cpup) | |
1778 | err |= put_user(cpu, cpup); | |
1779 | if (nodep) | |
1780 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1781 | return err ? -EFAULT : 0; |
1782 | } | |
10a0a8d4 JF |
1783 | |
1784 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1785 | ||
1786 | static void argv_cleanup(char **argv, char **envp) | |
1787 | { | |
1788 | argv_free(argv); | |
1789 | } | |
1790 | ||
1791 | /** | |
1792 | * orderly_poweroff - Trigger an orderly system poweroff | |
1793 | * @force: force poweroff if command execution fails | |
1794 | * | |
1795 | * This may be called from any context to trigger a system shutdown. | |
1796 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1797 | */ | |
1798 | int orderly_poweroff(bool force) | |
1799 | { | |
1800 | int argc; | |
1801 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1802 | static char *envp[] = { | |
1803 | "HOME=/", | |
1804 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1805 | NULL | |
1806 | }; | |
1807 | int ret = -ENOMEM; | |
1808 | struct subprocess_info *info; | |
1809 | ||
1810 | if (argv == NULL) { | |
1811 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1812 | __func__, poweroff_cmd); | |
1813 | goto out; | |
1814 | } | |
1815 | ||
ac331d15 | 1816 | info = call_usermodehelper_setup(argv[0], argv, envp, GFP_ATOMIC); |
10a0a8d4 JF |
1817 | if (info == NULL) { |
1818 | argv_free(argv); | |
1819 | goto out; | |
1820 | } | |
1821 | ||
1822 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1823 | ||
86313c48 | 1824 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1825 | |
1826 | out: | |
1827 | if (ret && force) { | |
1828 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1829 | "forcing the issue\n"); | |
1830 | ||
1831 | /* I guess this should try to kick off some daemon to | |
1832 | sync and poweroff asap. Or not even bother syncing | |
1833 | if we're doing an emergency shutdown? */ | |
1834 | emergency_sync(); | |
1835 | kernel_power_off(); | |
1836 | } | |
1837 | ||
1838 | return ret; | |
1839 | } | |
1840 | EXPORT_SYMBOL_GPL(orderly_poweroff); |