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 | { | |
117 | int no_nice; | |
118 | ||
119 | if (p->uid != current->euid && | |
120 | p->euid != current->euid && !capable(CAP_SYS_NICE)) { | |
121 | error = -EPERM; | |
122 | goto out; | |
123 | } | |
e43379f1 | 124 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
125 | error = -EACCES; |
126 | goto out; | |
127 | } | |
128 | no_nice = security_task_setnice(p, niceval); | |
129 | if (no_nice) { | |
130 | error = no_nice; | |
131 | goto out; | |
132 | } | |
133 | if (error == -ESRCH) | |
134 | error = 0; | |
135 | set_user_nice(p, niceval); | |
136 | out: | |
137 | return error; | |
138 | } | |
139 | ||
140 | asmlinkage long sys_setpriority(int which, int who, int niceval) | |
141 | { | |
142 | struct task_struct *g, *p; | |
143 | struct user_struct *user; | |
144 | int error = -EINVAL; | |
41487c65 | 145 | struct pid *pgrp; |
1da177e4 | 146 | |
3e88c553 | 147 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
148 | goto out; |
149 | ||
150 | /* normalize: avoid signed division (rounding problems) */ | |
151 | error = -ESRCH; | |
152 | if (niceval < -20) | |
153 | niceval = -20; | |
154 | if (niceval > 19) | |
155 | niceval = 19; | |
156 | ||
157 | read_lock(&tasklist_lock); | |
158 | switch (which) { | |
159 | case PRIO_PROCESS: | |
41487c65 | 160 | if (who) |
228ebcbe | 161 | p = find_task_by_vpid(who); |
41487c65 EB |
162 | else |
163 | p = current; | |
1da177e4 LT |
164 | if (p) |
165 | error = set_one_prio(p, niceval, error); | |
166 | break; | |
167 | case PRIO_PGRP: | |
41487c65 | 168 | if (who) |
b488893a | 169 | pgrp = find_vpid(who); |
41487c65 EB |
170 | else |
171 | pgrp = task_pgrp(current); | |
172 | do_each_pid_task(pgrp, PIDTYPE_PGID, p) { | |
1da177e4 | 173 | error = set_one_prio(p, niceval, error); |
41487c65 | 174 | } while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
175 | break; |
176 | case PRIO_USER: | |
177 | user = current->user; | |
178 | if (!who) | |
179 | who = current->uid; | |
180 | else | |
181 | if ((who != current->uid) && !(user = find_user(who))) | |
182 | goto out_unlock; /* No processes for this user */ | |
183 | ||
184 | do_each_thread(g, p) | |
185 | if (p->uid == who) | |
186 | error = set_one_prio(p, niceval, error); | |
187 | while_each_thread(g, p); | |
188 | if (who != current->uid) | |
189 | free_uid(user); /* For find_user() */ | |
190 | break; | |
191 | } | |
192 | out_unlock: | |
193 | read_unlock(&tasklist_lock); | |
194 | out: | |
195 | return error; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Ugh. To avoid negative return values, "getpriority()" will | |
200 | * not return the normal nice-value, but a negated value that | |
201 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
202 | * to stay compatible. | |
203 | */ | |
204 | asmlinkage long sys_getpriority(int which, int who) | |
205 | { | |
206 | struct task_struct *g, *p; | |
207 | struct user_struct *user; | |
208 | long niceval, retval = -ESRCH; | |
41487c65 | 209 | struct pid *pgrp; |
1da177e4 | 210 | |
3e88c553 | 211 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
212 | return -EINVAL; |
213 | ||
214 | read_lock(&tasklist_lock); | |
215 | switch (which) { | |
216 | case PRIO_PROCESS: | |
41487c65 | 217 | if (who) |
228ebcbe | 218 | p = find_task_by_vpid(who); |
41487c65 EB |
219 | else |
220 | p = current; | |
1da177e4 LT |
221 | if (p) { |
222 | niceval = 20 - task_nice(p); | |
223 | if (niceval > retval) | |
224 | retval = niceval; | |
225 | } | |
226 | break; | |
227 | case PRIO_PGRP: | |
41487c65 | 228 | if (who) |
b488893a | 229 | pgrp = find_vpid(who); |
41487c65 EB |
230 | else |
231 | pgrp = task_pgrp(current); | |
232 | do_each_pid_task(pgrp, PIDTYPE_PGID, p) { | |
1da177e4 LT |
233 | niceval = 20 - task_nice(p); |
234 | if (niceval > retval) | |
235 | retval = niceval; | |
41487c65 | 236 | } while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
237 | break; |
238 | case PRIO_USER: | |
239 | user = current->user; | |
240 | if (!who) | |
241 | who = current->uid; | |
242 | else | |
243 | if ((who != current->uid) && !(user = find_user(who))) | |
244 | goto out_unlock; /* No processes for this user */ | |
245 | ||
246 | do_each_thread(g, p) | |
247 | if (p->uid == who) { | |
248 | niceval = 20 - task_nice(p); | |
249 | if (niceval > retval) | |
250 | retval = niceval; | |
251 | } | |
252 | while_each_thread(g, p); | |
253 | if (who != current->uid) | |
254 | free_uid(user); /* for find_user() */ | |
255 | break; | |
256 | } | |
257 | out_unlock: | |
258 | read_unlock(&tasklist_lock); | |
259 | ||
260 | return retval; | |
261 | } | |
262 | ||
e4c94330 EB |
263 | /** |
264 | * emergency_restart - reboot the system | |
265 | * | |
266 | * Without shutting down any hardware or taking any locks | |
267 | * reboot the system. This is called when we know we are in | |
268 | * trouble so this is our best effort to reboot. This is | |
269 | * safe to call in interrupt context. | |
270 | */ | |
7c903473 EB |
271 | void emergency_restart(void) |
272 | { | |
273 | machine_emergency_restart(); | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(emergency_restart); | |
276 | ||
83cc5ed3 | 277 | static void kernel_restart_prepare(char *cmd) |
4a00ea1e | 278 | { |
e041c683 | 279 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
4a00ea1e | 280 | system_state = SYSTEM_RESTART; |
4a00ea1e | 281 | device_shutdown(); |
58b3b71d | 282 | sysdev_shutdown(); |
e4c94330 | 283 | } |
1e5d5331 RD |
284 | |
285 | /** | |
286 | * kernel_restart - reboot the system | |
287 | * @cmd: pointer to buffer containing command to execute for restart | |
b8887e6e | 288 | * or %NULL |
1e5d5331 RD |
289 | * |
290 | * Shutdown everything and perform a clean reboot. | |
291 | * This is not safe to call in interrupt context. | |
292 | */ | |
e4c94330 EB |
293 | void kernel_restart(char *cmd) |
294 | { | |
295 | kernel_restart_prepare(cmd); | |
756184b7 | 296 | if (!cmd) |
4a00ea1e | 297 | printk(KERN_EMERG "Restarting system.\n"); |
756184b7 | 298 | else |
4a00ea1e | 299 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
4a00ea1e EB |
300 | machine_restart(cmd); |
301 | } | |
302 | EXPORT_SYMBOL_GPL(kernel_restart); | |
303 | ||
e4c94330 EB |
304 | /** |
305 | * kernel_kexec - reboot the system | |
306 | * | |
307 | * Move into place and start executing a preloaded standalone | |
308 | * executable. If nothing was preloaded return an error. | |
309 | */ | |
83cc5ed3 | 310 | static void kernel_kexec(void) |
4a00ea1e EB |
311 | { |
312 | #ifdef CONFIG_KEXEC | |
313 | struct kimage *image; | |
4bb8089c | 314 | image = xchg(&kexec_image, NULL); |
756184b7 | 315 | if (!image) |
4a00ea1e | 316 | return; |
e4c94330 | 317 | kernel_restart_prepare(NULL); |
4a00ea1e EB |
318 | printk(KERN_EMERG "Starting new kernel\n"); |
319 | machine_shutdown(); | |
320 | machine_kexec(image); | |
321 | #endif | |
322 | } | |
4a00ea1e | 323 | |
4ef7229f | 324 | static void kernel_shutdown_prepare(enum system_states state) |
729b4d4c | 325 | { |
e041c683 | 326 | blocking_notifier_call_chain(&reboot_notifier_list, |
729b4d4c AS |
327 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
328 | system_state = state; | |
329 | device_shutdown(); | |
330 | } | |
e4c94330 EB |
331 | /** |
332 | * kernel_halt - halt the system | |
333 | * | |
334 | * Shutdown everything and perform a clean system halt. | |
335 | */ | |
e4c94330 EB |
336 | void kernel_halt(void) |
337 | { | |
729b4d4c | 338 | kernel_shutdown_prepare(SYSTEM_HALT); |
58b3b71d | 339 | sysdev_shutdown(); |
4a00ea1e EB |
340 | printk(KERN_EMERG "System halted.\n"); |
341 | machine_halt(); | |
342 | } | |
729b4d4c | 343 | |
4a00ea1e EB |
344 | EXPORT_SYMBOL_GPL(kernel_halt); |
345 | ||
e4c94330 EB |
346 | /** |
347 | * kernel_power_off - power_off the system | |
348 | * | |
349 | * Shutdown everything and perform a clean system power_off. | |
350 | */ | |
e4c94330 EB |
351 | void kernel_power_off(void) |
352 | { | |
729b4d4c | 353 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
bd804eba RW |
354 | if (pm_power_off_prepare) |
355 | pm_power_off_prepare(); | |
4047727e | 356 | disable_nonboot_cpus(); |
58b3b71d | 357 | sysdev_shutdown(); |
4a00ea1e EB |
358 | printk(KERN_EMERG "Power down.\n"); |
359 | machine_power_off(); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(kernel_power_off); | |
1da177e4 LT |
362 | /* |
363 | * Reboot system call: for obvious reasons only root may call it, | |
364 | * and even root needs to set up some magic numbers in the registers | |
365 | * so that some mistake won't make this reboot the whole machine. | |
366 | * You can also set the meaning of the ctrl-alt-del-key here. | |
367 | * | |
368 | * reboot doesn't sync: do that yourself before calling this. | |
369 | */ | |
370 | asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user * arg) | |
371 | { | |
372 | char buffer[256]; | |
373 | ||
374 | /* We only trust the superuser with rebooting the system. */ | |
375 | if (!capable(CAP_SYS_BOOT)) | |
376 | return -EPERM; | |
377 | ||
378 | /* For safety, we require "magic" arguments. */ | |
379 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
380 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
381 | magic2 != LINUX_REBOOT_MAGIC2A && | |
382 | magic2 != LINUX_REBOOT_MAGIC2B && | |
383 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
384 | return -EINVAL; | |
385 | ||
5e38291d EB |
386 | /* Instead of trying to make the power_off code look like |
387 | * halt when pm_power_off is not set do it the easy way. | |
388 | */ | |
389 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) | |
390 | cmd = LINUX_REBOOT_CMD_HALT; | |
391 | ||
1da177e4 LT |
392 | lock_kernel(); |
393 | switch (cmd) { | |
394 | case LINUX_REBOOT_CMD_RESTART: | |
4a00ea1e | 395 | kernel_restart(NULL); |
1da177e4 LT |
396 | break; |
397 | ||
398 | case LINUX_REBOOT_CMD_CAD_ON: | |
399 | C_A_D = 1; | |
400 | break; | |
401 | ||
402 | case LINUX_REBOOT_CMD_CAD_OFF: | |
403 | C_A_D = 0; | |
404 | break; | |
405 | ||
406 | case LINUX_REBOOT_CMD_HALT: | |
4a00ea1e | 407 | kernel_halt(); |
1da177e4 LT |
408 | unlock_kernel(); |
409 | do_exit(0); | |
410 | break; | |
411 | ||
412 | case LINUX_REBOOT_CMD_POWER_OFF: | |
4a00ea1e | 413 | kernel_power_off(); |
1da177e4 LT |
414 | unlock_kernel(); |
415 | do_exit(0); | |
416 | break; | |
417 | ||
418 | case LINUX_REBOOT_CMD_RESTART2: | |
419 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { | |
420 | unlock_kernel(); | |
421 | return -EFAULT; | |
422 | } | |
423 | buffer[sizeof(buffer) - 1] = '\0'; | |
424 | ||
4a00ea1e | 425 | kernel_restart(buffer); |
1da177e4 LT |
426 | break; |
427 | ||
dc009d92 | 428 | case LINUX_REBOOT_CMD_KEXEC: |
4a00ea1e EB |
429 | kernel_kexec(); |
430 | unlock_kernel(); | |
431 | return -EINVAL; | |
432 | ||
b0cb1a19 | 433 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
434 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
435 | { | |
a3d25c27 | 436 | int ret = hibernate(); |
1da177e4 LT |
437 | unlock_kernel(); |
438 | return ret; | |
439 | } | |
440 | #endif | |
441 | ||
442 | default: | |
443 | unlock_kernel(); | |
444 | return -EINVAL; | |
445 | } | |
446 | unlock_kernel(); | |
447 | return 0; | |
448 | } | |
449 | ||
65f27f38 | 450 | static void deferred_cad(struct work_struct *dummy) |
1da177e4 | 451 | { |
abcd9e51 | 452 | kernel_restart(NULL); |
1da177e4 LT |
453 | } |
454 | ||
455 | /* | |
456 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. | |
457 | * As it's called within an interrupt, it may NOT sync: the only choice | |
458 | * is whether to reboot at once, or just ignore the ctrl-alt-del. | |
459 | */ | |
460 | void ctrl_alt_del(void) | |
461 | { | |
65f27f38 | 462 | static DECLARE_WORK(cad_work, deferred_cad); |
1da177e4 LT |
463 | |
464 | if (C_A_D) | |
465 | schedule_work(&cad_work); | |
466 | else | |
9ec52099 | 467 | kill_cad_pid(SIGINT, 1); |
1da177e4 LT |
468 | } |
469 | ||
1da177e4 LT |
470 | /* |
471 | * Unprivileged users may change the real gid to the effective gid | |
472 | * or vice versa. (BSD-style) | |
473 | * | |
474 | * If you set the real gid at all, or set the effective gid to a value not | |
475 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
476 | * | |
477 | * This makes it possible for a setgid program to completely drop its | |
478 | * privileges, which is often a useful assertion to make when you are doing | |
479 | * a security audit over a program. | |
480 | * | |
481 | * The general idea is that a program which uses just setregid() will be | |
482 | * 100% compatible with BSD. A program which uses just setgid() will be | |
483 | * 100% compatible with POSIX with saved IDs. | |
484 | * | |
485 | * SMP: There are not races, the GIDs are checked only by filesystem | |
486 | * operations (as far as semantic preservation is concerned). | |
487 | */ | |
488 | asmlinkage long sys_setregid(gid_t rgid, gid_t egid) | |
489 | { | |
490 | int old_rgid = current->gid; | |
491 | int old_egid = current->egid; | |
492 | int new_rgid = old_rgid; | |
493 | int new_egid = old_egid; | |
494 | int retval; | |
495 | ||
496 | retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); | |
497 | if (retval) | |
498 | return retval; | |
499 | ||
500 | if (rgid != (gid_t) -1) { | |
501 | if ((old_rgid == rgid) || | |
502 | (current->egid==rgid) || | |
503 | capable(CAP_SETGID)) | |
504 | new_rgid = rgid; | |
505 | else | |
506 | return -EPERM; | |
507 | } | |
508 | if (egid != (gid_t) -1) { | |
509 | if ((old_rgid == egid) || | |
510 | (current->egid == egid) || | |
511 | (current->sgid == egid) || | |
512 | capable(CAP_SETGID)) | |
513 | new_egid = egid; | |
756184b7 | 514 | else |
1da177e4 | 515 | return -EPERM; |
1da177e4 | 516 | } |
756184b7 | 517 | if (new_egid != old_egid) { |
6c5d5238 | 518 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 519 | smp_wmb(); |
1da177e4 LT |
520 | } |
521 | if (rgid != (gid_t) -1 || | |
522 | (egid != (gid_t) -1 && egid != old_rgid)) | |
523 | current->sgid = new_egid; | |
524 | current->fsgid = new_egid; | |
525 | current->egid = new_egid; | |
526 | current->gid = new_rgid; | |
527 | key_fsgid_changed(current); | |
9f46080c | 528 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
529 | return 0; |
530 | } | |
531 | ||
532 | /* | |
533 | * setgid() is implemented like SysV w/ SAVED_IDS | |
534 | * | |
535 | * SMP: Same implicit races as above. | |
536 | */ | |
537 | asmlinkage long sys_setgid(gid_t gid) | |
538 | { | |
539 | int old_egid = current->egid; | |
540 | int retval; | |
541 | ||
542 | retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); | |
543 | if (retval) | |
544 | return retval; | |
545 | ||
756184b7 CP |
546 | if (capable(CAP_SETGID)) { |
547 | if (old_egid != gid) { | |
6c5d5238 | 548 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 549 | smp_wmb(); |
1da177e4 LT |
550 | } |
551 | current->gid = current->egid = current->sgid = current->fsgid = gid; | |
756184b7 CP |
552 | } else if ((gid == current->gid) || (gid == current->sgid)) { |
553 | if (old_egid != gid) { | |
6c5d5238 | 554 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 555 | smp_wmb(); |
1da177e4 LT |
556 | } |
557 | current->egid = current->fsgid = gid; | |
558 | } | |
559 | else | |
560 | return -EPERM; | |
561 | ||
562 | key_fsgid_changed(current); | |
9f46080c | 563 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
564 | return 0; |
565 | } | |
566 | ||
567 | static int set_user(uid_t new_ruid, int dumpclear) | |
568 | { | |
569 | struct user_struct *new_user; | |
570 | ||
acce292c | 571 | new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); |
1da177e4 LT |
572 | if (!new_user) |
573 | return -EAGAIN; | |
574 | ||
575 | if (atomic_read(&new_user->processes) >= | |
576 | current->signal->rlim[RLIMIT_NPROC].rlim_cur && | |
acce292c | 577 | new_user != current->nsproxy->user_ns->root_user) { |
1da177e4 LT |
578 | free_uid(new_user); |
579 | return -EAGAIN; | |
580 | } | |
581 | ||
582 | switch_uid(new_user); | |
583 | ||
756184b7 | 584 | if (dumpclear) { |
6c5d5238 | 585 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 586 | smp_wmb(); |
1da177e4 LT |
587 | } |
588 | current->uid = new_ruid; | |
589 | return 0; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Unprivileged users may change the real uid to the effective uid | |
594 | * or vice versa. (BSD-style) | |
595 | * | |
596 | * If you set the real uid at all, or set the effective uid to a value not | |
597 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
598 | * | |
599 | * This makes it possible for a setuid program to completely drop its | |
600 | * privileges, which is often a useful assertion to make when you are doing | |
601 | * a security audit over a program. | |
602 | * | |
603 | * The general idea is that a program which uses just setreuid() will be | |
604 | * 100% compatible with BSD. A program which uses just setuid() will be | |
605 | * 100% compatible with POSIX with saved IDs. | |
606 | */ | |
607 | asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) | |
608 | { | |
609 | int old_ruid, old_euid, old_suid, new_ruid, new_euid; | |
610 | int retval; | |
611 | ||
612 | retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); | |
613 | if (retval) | |
614 | return retval; | |
615 | ||
616 | new_ruid = old_ruid = current->uid; | |
617 | new_euid = old_euid = current->euid; | |
618 | old_suid = current->suid; | |
619 | ||
620 | if (ruid != (uid_t) -1) { | |
621 | new_ruid = ruid; | |
622 | if ((old_ruid != ruid) && | |
623 | (current->euid != ruid) && | |
624 | !capable(CAP_SETUID)) | |
625 | return -EPERM; | |
626 | } | |
627 | ||
628 | if (euid != (uid_t) -1) { | |
629 | new_euid = euid; | |
630 | if ((old_ruid != euid) && | |
631 | (current->euid != euid) && | |
632 | (current->suid != euid) && | |
633 | !capable(CAP_SETUID)) | |
634 | return -EPERM; | |
635 | } | |
636 | ||
637 | if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) | |
638 | return -EAGAIN; | |
639 | ||
756184b7 | 640 | if (new_euid != old_euid) { |
6c5d5238 | 641 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 642 | smp_wmb(); |
1da177e4 LT |
643 | } |
644 | current->fsuid = current->euid = new_euid; | |
645 | if (ruid != (uid_t) -1 || | |
646 | (euid != (uid_t) -1 && euid != old_ruid)) | |
647 | current->suid = current->euid; | |
648 | current->fsuid = current->euid; | |
649 | ||
650 | key_fsuid_changed(current); | |
9f46080c | 651 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
652 | |
653 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE); | |
654 | } | |
655 | ||
656 | ||
657 | ||
658 | /* | |
659 | * setuid() is implemented like SysV with SAVED_IDS | |
660 | * | |
661 | * Note that SAVED_ID's is deficient in that a setuid root program | |
662 | * like sendmail, for example, cannot set its uid to be a normal | |
663 | * user and then switch back, because if you're root, setuid() sets | |
664 | * the saved uid too. If you don't like this, blame the bright people | |
665 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
666 | * will allow a root program to temporarily drop privileges and be able to | |
667 | * regain them by swapping the real and effective uid. | |
668 | */ | |
669 | asmlinkage long sys_setuid(uid_t uid) | |
670 | { | |
671 | int old_euid = current->euid; | |
a09c17a6 | 672 | int old_ruid, old_suid, new_suid; |
1da177e4 LT |
673 | int retval; |
674 | ||
675 | retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); | |
676 | if (retval) | |
677 | return retval; | |
678 | ||
a09c17a6 | 679 | old_ruid = current->uid; |
1da177e4 LT |
680 | old_suid = current->suid; |
681 | new_suid = old_suid; | |
682 | ||
683 | if (capable(CAP_SETUID)) { | |
684 | if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) | |
685 | return -EAGAIN; | |
686 | new_suid = uid; | |
687 | } else if ((uid != current->uid) && (uid != new_suid)) | |
688 | return -EPERM; | |
689 | ||
756184b7 | 690 | if (old_euid != uid) { |
6c5d5238 | 691 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 692 | smp_wmb(); |
1da177e4 LT |
693 | } |
694 | current->fsuid = current->euid = uid; | |
695 | current->suid = new_suid; | |
696 | ||
697 | key_fsuid_changed(current); | |
9f46080c | 698 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
699 | |
700 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); | |
701 | } | |
702 | ||
703 | ||
704 | /* | |
705 | * This function implements a generic ability to update ruid, euid, | |
706 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
707 | */ | |
708 | asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) | |
709 | { | |
710 | int old_ruid = current->uid; | |
711 | int old_euid = current->euid; | |
712 | int old_suid = current->suid; | |
713 | int retval; | |
714 | ||
715 | retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); | |
716 | if (retval) | |
717 | return retval; | |
718 | ||
719 | if (!capable(CAP_SETUID)) { | |
720 | if ((ruid != (uid_t) -1) && (ruid != current->uid) && | |
721 | (ruid != current->euid) && (ruid != current->suid)) | |
722 | return -EPERM; | |
723 | if ((euid != (uid_t) -1) && (euid != current->uid) && | |
724 | (euid != current->euid) && (euid != current->suid)) | |
725 | return -EPERM; | |
726 | if ((suid != (uid_t) -1) && (suid != current->uid) && | |
727 | (suid != current->euid) && (suid != current->suid)) | |
728 | return -EPERM; | |
729 | } | |
730 | if (ruid != (uid_t) -1) { | |
731 | if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0) | |
732 | return -EAGAIN; | |
733 | } | |
734 | if (euid != (uid_t) -1) { | |
756184b7 | 735 | if (euid != current->euid) { |
6c5d5238 | 736 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 737 | smp_wmb(); |
1da177e4 LT |
738 | } |
739 | current->euid = euid; | |
740 | } | |
741 | current->fsuid = current->euid; | |
742 | if (suid != (uid_t) -1) | |
743 | current->suid = suid; | |
744 | ||
745 | key_fsuid_changed(current); | |
9f46080c | 746 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
747 | |
748 | return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); | |
749 | } | |
750 | ||
751 | asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) | |
752 | { | |
753 | int retval; | |
754 | ||
755 | if (!(retval = put_user(current->uid, ruid)) && | |
756 | !(retval = put_user(current->euid, euid))) | |
757 | retval = put_user(current->suid, suid); | |
758 | ||
759 | return retval; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Same as above, but for rgid, egid, sgid. | |
764 | */ | |
765 | asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) | |
766 | { | |
767 | int retval; | |
768 | ||
769 | retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); | |
770 | if (retval) | |
771 | return retval; | |
772 | ||
773 | if (!capable(CAP_SETGID)) { | |
774 | if ((rgid != (gid_t) -1) && (rgid != current->gid) && | |
775 | (rgid != current->egid) && (rgid != current->sgid)) | |
776 | return -EPERM; | |
777 | if ((egid != (gid_t) -1) && (egid != current->gid) && | |
778 | (egid != current->egid) && (egid != current->sgid)) | |
779 | return -EPERM; | |
780 | if ((sgid != (gid_t) -1) && (sgid != current->gid) && | |
781 | (sgid != current->egid) && (sgid != current->sgid)) | |
782 | return -EPERM; | |
783 | } | |
784 | if (egid != (gid_t) -1) { | |
756184b7 | 785 | if (egid != current->egid) { |
6c5d5238 | 786 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 787 | smp_wmb(); |
1da177e4 LT |
788 | } |
789 | current->egid = egid; | |
790 | } | |
791 | current->fsgid = current->egid; | |
792 | if (rgid != (gid_t) -1) | |
793 | current->gid = rgid; | |
794 | if (sgid != (gid_t) -1) | |
795 | current->sgid = sgid; | |
796 | ||
797 | key_fsgid_changed(current); | |
9f46080c | 798 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
799 | return 0; |
800 | } | |
801 | ||
802 | asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) | |
803 | { | |
804 | int retval; | |
805 | ||
806 | if (!(retval = put_user(current->gid, rgid)) && | |
807 | !(retval = put_user(current->egid, egid))) | |
808 | retval = put_user(current->sgid, sgid); | |
809 | ||
810 | return retval; | |
811 | } | |
812 | ||
813 | ||
814 | /* | |
815 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
816 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
817 | * whatever uid it wants to). It normally shadows "euid", except when | |
818 | * explicitly set by setfsuid() or for access.. | |
819 | */ | |
820 | asmlinkage long sys_setfsuid(uid_t uid) | |
821 | { | |
822 | int old_fsuid; | |
823 | ||
824 | old_fsuid = current->fsuid; | |
825 | if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) | |
826 | return old_fsuid; | |
827 | ||
828 | if (uid == current->uid || uid == current->euid || | |
829 | uid == current->suid || uid == current->fsuid || | |
756184b7 CP |
830 | capable(CAP_SETUID)) { |
831 | if (uid != old_fsuid) { | |
6c5d5238 | 832 | set_dumpable(current->mm, suid_dumpable); |
d59dd462 | 833 | smp_wmb(); |
1da177e4 LT |
834 | } |
835 | current->fsuid = uid; | |
836 | } | |
837 | ||
838 | key_fsuid_changed(current); | |
9f46080c | 839 | proc_id_connector(current, PROC_EVENT_UID); |
1da177e4 LT |
840 | |
841 | security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS); | |
842 | ||
843 | return old_fsuid; | |
844 | } | |
845 | ||
846 | /* | |
f42df9e6 | 847 | * Samma på svenska.. |
1da177e4 LT |
848 | */ |
849 | asmlinkage long sys_setfsgid(gid_t gid) | |
850 | { | |
851 | int old_fsgid; | |
852 | ||
853 | old_fsgid = current->fsgid; | |
854 | if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) | |
855 | return old_fsgid; | |
856 | ||
857 | if (gid == current->gid || gid == current->egid || | |
858 | gid == current->sgid || gid == current->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 LT |
863 | } |
864 | current->fsgid = gid; | |
865 | key_fsgid_changed(current); | |
9f46080c | 866 | proc_id_connector(current, PROC_EVENT_GID); |
1da177e4 LT |
867 | } |
868 | return old_fsgid; | |
869 | } | |
870 | ||
871 | asmlinkage long sys_times(struct tms __user * tbuf) | |
872 | { | |
873 | /* | |
874 | * In the SMP world we might just be unlucky and have one of | |
875 | * the times increment as we use it. Since the value is an | |
876 | * atomically safe type this is just fine. Conceptually its | |
877 | * as if the syscall took an instant longer to occur. | |
878 | */ | |
879 | if (tbuf) { | |
880 | struct tms tmp; | |
35f5cad8 ON |
881 | struct task_struct *tsk = current; |
882 | struct task_struct *t; | |
1da177e4 LT |
883 | cputime_t utime, stime, cutime, cstime; |
884 | ||
7d7185c8 | 885 | spin_lock_irq(&tsk->sighand->siglock); |
35f5cad8 ON |
886 | utime = tsk->signal->utime; |
887 | stime = tsk->signal->stime; | |
888 | t = tsk; | |
889 | do { | |
890 | utime = cputime_add(utime, t->utime); | |
891 | stime = cputime_add(stime, t->stime); | |
892 | t = next_thread(t); | |
893 | } while (t != tsk); | |
894 | ||
35f5cad8 ON |
895 | cutime = tsk->signal->cutime; |
896 | cstime = tsk->signal->cstime; | |
897 | spin_unlock_irq(&tsk->sighand->siglock); | |
1da177e4 LT |
898 | |
899 | tmp.tms_utime = cputime_to_clock_t(utime); | |
900 | tmp.tms_stime = cputime_to_clock_t(stime); | |
901 | tmp.tms_cutime = cputime_to_clock_t(cutime); | |
902 | tmp.tms_cstime = cputime_to_clock_t(cstime); | |
903 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) | |
904 | return -EFAULT; | |
905 | } | |
906 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); | |
907 | } | |
908 | ||
909 | /* | |
910 | * This needs some heavy checking ... | |
911 | * I just haven't the stomach for it. I also don't fully | |
912 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
913 | * | |
914 | * OK, I think I have the protection semantics right.... this is really | |
915 | * only important on a multi-user system anyway, to make sure one user | |
916 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
917 | * | |
918 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
919 | * LBT 04.03.94 | |
920 | */ | |
1da177e4 LT |
921 | asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) |
922 | { | |
923 | struct task_struct *p; | |
ee0acf90 | 924 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
925 | struct pid *pgrp; |
926 | int err; | |
1da177e4 LT |
927 | |
928 | if (!pid) | |
b488893a | 929 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
930 | if (!pgid) |
931 | pgid = pid; | |
932 | if (pgid < 0) | |
933 | return -EINVAL; | |
934 | ||
935 | /* From this point forward we keep holding onto the tasklist lock | |
936 | * so that our parent does not change from under us. -DaveM | |
937 | */ | |
938 | write_lock_irq(&tasklist_lock); | |
939 | ||
940 | err = -ESRCH; | |
4e021306 | 941 | p = find_task_by_vpid(pid); |
1da177e4 LT |
942 | if (!p) |
943 | goto out; | |
944 | ||
945 | err = -EINVAL; | |
946 | if (!thread_group_leader(p)) | |
947 | goto out; | |
948 | ||
4e021306 | 949 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 950 | err = -EPERM; |
41487c65 | 951 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
952 | goto out; |
953 | err = -EACCES; | |
954 | if (p->did_exec) | |
955 | goto out; | |
956 | } else { | |
957 | err = -ESRCH; | |
ee0acf90 | 958 | if (p != group_leader) |
1da177e4 LT |
959 | goto out; |
960 | } | |
961 | ||
962 | err = -EPERM; | |
963 | if (p->signal->leader) | |
964 | goto out; | |
965 | ||
4e021306 | 966 | pgrp = task_pid(p); |
1da177e4 | 967 | if (pgid != pid) { |
b488893a | 968 | struct task_struct *g; |
1da177e4 | 969 | |
4e021306 ON |
970 | pgrp = find_vpid(pgid); |
971 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 972 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 973 | goto out; |
1da177e4 LT |
974 | } |
975 | ||
1da177e4 LT |
976 | err = security_task_setpgid(p, pgid); |
977 | if (err) | |
978 | goto out; | |
979 | ||
4e021306 | 980 | if (task_pgrp(p) != pgrp) { |
1da177e4 | 981 | detach_pid(p, PIDTYPE_PGID); |
4e021306 ON |
982 | attach_pid(p, PIDTYPE_PGID, pgrp); |
983 | set_task_pgrp(p, pid_nr(pgrp)); | |
1da177e4 LT |
984 | } |
985 | ||
986 | err = 0; | |
987 | out: | |
988 | /* All paths lead to here, thus we are safe. -DaveM */ | |
989 | write_unlock_irq(&tasklist_lock); | |
990 | return err; | |
991 | } | |
992 | ||
993 | asmlinkage long sys_getpgid(pid_t pid) | |
994 | { | |
756184b7 | 995 | if (!pid) |
b488893a | 996 | return task_pgrp_vnr(current); |
756184b7 | 997 | else { |
1da177e4 LT |
998 | int retval; |
999 | struct task_struct *p; | |
1da177e4 | 1000 | |
b488893a | 1001 | read_lock(&tasklist_lock); |
6c5f3e7b | 1002 | p = find_task_by_vpid(pid); |
1da177e4 LT |
1003 | retval = -ESRCH; |
1004 | if (p) { | |
1005 | retval = security_task_getpgid(p); | |
1006 | if (!retval) | |
6c5f3e7b | 1007 | retval = task_pgrp_vnr(p); |
1da177e4 LT |
1008 | } |
1009 | read_unlock(&tasklist_lock); | |
1010 | return retval; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1015 | ||
1016 | asmlinkage long sys_getpgrp(void) | |
1017 | { | |
1018 | /* SMP - assuming writes are word atomic this is fine */ | |
b488893a | 1019 | return task_pgrp_vnr(current); |
1da177e4 LT |
1020 | } |
1021 | ||
1022 | #endif | |
1023 | ||
1024 | asmlinkage long sys_getsid(pid_t pid) | |
1025 | { | |
756184b7 | 1026 | if (!pid) |
b488893a | 1027 | return task_session_vnr(current); |
756184b7 | 1028 | else { |
1da177e4 LT |
1029 | int retval; |
1030 | struct task_struct *p; | |
1da177e4 | 1031 | |
ac9a8e3f ON |
1032 | rcu_read_lock(); |
1033 | p = find_task_by_vpid(pid); | |
1da177e4 | 1034 | retval = -ESRCH; |
756184b7 | 1035 | if (p) { |
1da177e4 LT |
1036 | retval = security_task_getsid(p); |
1037 | if (!retval) | |
ac9a8e3f | 1038 | retval = task_session_vnr(p); |
1da177e4 | 1039 | } |
ac9a8e3f | 1040 | rcu_read_unlock(); |
1da177e4 LT |
1041 | return retval; |
1042 | } | |
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 PZ |
1065 | |
1066 | spin_lock(&group_leader->sighand->siglock); | |
e19f247a | 1067 | group_leader->signal->tty = NULL; |
24ec839c PZ |
1068 | spin_unlock(&group_leader->sighand->siglock); |
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 */ | |
3e30148c | 1204 | int groups_search(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 | ||
1226 | /* validate and set current->group_info */ | |
1227 | int set_current_groups(struct group_info *group_info) | |
1228 | { | |
1229 | int retval; | |
1230 | struct group_info *old_info; | |
1231 | ||
1232 | retval = security_task_setgroups(group_info); | |
1233 | if (retval) | |
1234 | return retval; | |
1235 | ||
1236 | groups_sort(group_info); | |
1237 | get_group_info(group_info); | |
1238 | ||
1239 | task_lock(current); | |
1240 | old_info = current->group_info; | |
1241 | current->group_info = group_info; | |
1242 | task_unlock(current); | |
1243 | ||
1244 | put_group_info(old_info); | |
1245 | ||
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | EXPORT_SYMBOL(set_current_groups); | |
1250 | ||
1251 | asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) | |
1252 | { | |
1253 | int i = 0; | |
1254 | ||
1255 | /* | |
1256 | * SMP: Nobody else can change our grouplist. Thus we are | |
1257 | * safe. | |
1258 | */ | |
1259 | ||
1260 | if (gidsetsize < 0) | |
1261 | return -EINVAL; | |
1262 | ||
1263 | /* no need to grab task_lock here; it cannot change */ | |
1da177e4 LT |
1264 | i = current->group_info->ngroups; |
1265 | if (gidsetsize) { | |
1266 | if (i > gidsetsize) { | |
1267 | i = -EINVAL; | |
1268 | goto out; | |
1269 | } | |
1270 | if (groups_to_user(grouplist, current->group_info)) { | |
1271 | i = -EFAULT; | |
1272 | goto out; | |
1273 | } | |
1274 | } | |
1275 | out: | |
1da177e4 LT |
1276 | return i; |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * SMP: Our groups are copy-on-write. We can set them safely | |
1281 | * without another task interfering. | |
1282 | */ | |
1283 | ||
1284 | asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist) | |
1285 | { | |
1286 | struct group_info *group_info; | |
1287 | int retval; | |
1288 | ||
1289 | if (!capable(CAP_SETGID)) | |
1290 | return -EPERM; | |
1291 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | group_info = groups_alloc(gidsetsize); | |
1295 | if (!group_info) | |
1296 | return -ENOMEM; | |
1297 | retval = groups_from_user(group_info, grouplist); | |
1298 | if (retval) { | |
1299 | put_group_info(group_info); | |
1300 | return retval; | |
1301 | } | |
1302 | ||
1303 | retval = set_current_groups(group_info); | |
1304 | put_group_info(group_info); | |
1305 | ||
1306 | return retval; | |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * Check whether we're fsgid/egid or in the supplemental group.. | |
1311 | */ | |
1312 | int in_group_p(gid_t grp) | |
1313 | { | |
1314 | int retval = 1; | |
756184b7 | 1315 | if (grp != current->fsgid) |
1da177e4 | 1316 | retval = groups_search(current->group_info, grp); |
1da177e4 LT |
1317 | return retval; |
1318 | } | |
1319 | ||
1320 | EXPORT_SYMBOL(in_group_p); | |
1321 | ||
1322 | int in_egroup_p(gid_t grp) | |
1323 | { | |
1324 | int retval = 1; | |
756184b7 | 1325 | if (grp != current->egid) |
1da177e4 | 1326 | retval = groups_search(current->group_info, grp); |
1da177e4 LT |
1327 | return retval; |
1328 | } | |
1329 | ||
1330 | EXPORT_SYMBOL(in_egroup_p); | |
1331 | ||
1332 | DECLARE_RWSEM(uts_sem); | |
1333 | ||
393b0725 DM |
1334 | EXPORT_SYMBOL(uts_sem); |
1335 | ||
1da177e4 LT |
1336 | asmlinkage long sys_newuname(struct new_utsname __user * name) |
1337 | { | |
1338 | int errno = 0; | |
1339 | ||
1340 | down_read(&uts_sem); | |
e9ff3990 | 1341 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1342 | errno = -EFAULT; |
1343 | up_read(&uts_sem); | |
1344 | return errno; | |
1345 | } | |
1346 | ||
1347 | asmlinkage long sys_sethostname(char __user *name, int len) | |
1348 | { | |
1349 | int errno; | |
1350 | char tmp[__NEW_UTS_LEN]; | |
1351 | ||
1352 | if (!capable(CAP_SYS_ADMIN)) | |
1353 | return -EPERM; | |
1354 | if (len < 0 || len > __NEW_UTS_LEN) | |
1355 | return -EINVAL; | |
1356 | down_write(&uts_sem); | |
1357 | errno = -EFAULT; | |
1358 | if (!copy_from_user(tmp, name, len)) { | |
e9ff3990 SH |
1359 | memcpy(utsname()->nodename, tmp, len); |
1360 | utsname()->nodename[len] = 0; | |
1da177e4 LT |
1361 | errno = 0; |
1362 | } | |
1363 | up_write(&uts_sem); | |
1364 | return errno; | |
1365 | } | |
1366 | ||
1367 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1368 | ||
1369 | asmlinkage long sys_gethostname(char __user *name, int len) | |
1370 | { | |
1371 | int i, errno; | |
1372 | ||
1373 | if (len < 0) | |
1374 | return -EINVAL; | |
1375 | down_read(&uts_sem); | |
e9ff3990 | 1376 | i = 1 + strlen(utsname()->nodename); |
1da177e4 LT |
1377 | if (i > len) |
1378 | i = len; | |
1379 | errno = 0; | |
e9ff3990 | 1380 | if (copy_to_user(name, utsname()->nodename, i)) |
1da177e4 LT |
1381 | errno = -EFAULT; |
1382 | up_read(&uts_sem); | |
1383 | return errno; | |
1384 | } | |
1385 | ||
1386 | #endif | |
1387 | ||
1388 | /* | |
1389 | * Only setdomainname; getdomainname can be implemented by calling | |
1390 | * uname() | |
1391 | */ | |
1392 | asmlinkage long sys_setdomainname(char __user *name, int len) | |
1393 | { | |
1394 | int errno; | |
1395 | char tmp[__NEW_UTS_LEN]; | |
1396 | ||
1397 | if (!capable(CAP_SYS_ADMIN)) | |
1398 | return -EPERM; | |
1399 | if (len < 0 || len > __NEW_UTS_LEN) | |
1400 | return -EINVAL; | |
1401 | ||
1402 | down_write(&uts_sem); | |
1403 | errno = -EFAULT; | |
1404 | if (!copy_from_user(tmp, name, len)) { | |
e9ff3990 SH |
1405 | memcpy(utsname()->domainname, tmp, len); |
1406 | utsname()->domainname[len] = 0; | |
1da177e4 LT |
1407 | errno = 0; |
1408 | } | |
1409 | up_write(&uts_sem); | |
1410 | return errno; | |
1411 | } | |
1412 | ||
1413 | asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1414 | { | |
1415 | if (resource >= RLIM_NLIMITS) | |
1416 | return -EINVAL; | |
1417 | else { | |
1418 | struct rlimit value; | |
1419 | task_lock(current->group_leader); | |
1420 | value = current->signal->rlim[resource]; | |
1421 | task_unlock(current->group_leader); | |
1422 | return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1427 | ||
1428 | /* | |
1429 | * Back compatibility for getrlimit. Needed for some apps. | |
1430 | */ | |
1431 | ||
1432 | asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1433 | { | |
1434 | struct rlimit x; | |
1435 | if (resource >= RLIM_NLIMITS) | |
1436 | return -EINVAL; | |
1437 | ||
1438 | task_lock(current->group_leader); | |
1439 | x = current->signal->rlim[resource]; | |
1440 | task_unlock(current->group_leader); | |
756184b7 | 1441 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1442 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1443 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1444 | x.rlim_max = 0x7FFFFFFF; |
1445 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1446 | } | |
1447 | ||
1448 | #endif | |
1449 | ||
1450 | asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim) | |
1451 | { | |
1452 | struct rlimit new_rlim, *old_rlim; | |
ec9e16ba | 1453 | unsigned long it_prof_secs; |
1da177e4 LT |
1454 | int retval; |
1455 | ||
1456 | if (resource >= RLIM_NLIMITS) | |
1457 | return -EINVAL; | |
ec9e16ba | 1458 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
1da177e4 | 1459 | return -EFAULT; |
ec9e16ba AM |
1460 | if (new_rlim.rlim_cur > new_rlim.rlim_max) |
1461 | return -EINVAL; | |
1da177e4 LT |
1462 | old_rlim = current->signal->rlim + resource; |
1463 | if ((new_rlim.rlim_max > old_rlim->rlim_max) && | |
1464 | !capable(CAP_SYS_RESOURCE)) | |
1465 | return -EPERM; | |
9cfe015a | 1466 | if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open) |
ec9e16ba | 1467 | return -EPERM; |
1da177e4 LT |
1468 | |
1469 | retval = security_task_setrlimit(resource, &new_rlim); | |
1470 | if (retval) | |
1471 | return retval; | |
1472 | ||
9926e4c7 TA |
1473 | if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) { |
1474 | /* | |
1475 | * The caller is asking for an immediate RLIMIT_CPU | |
1476 | * expiry. But we use the zero value to mean "it was | |
1477 | * never set". So let's cheat and make it one second | |
1478 | * instead | |
1479 | */ | |
1480 | new_rlim.rlim_cur = 1; | |
1481 | } | |
1482 | ||
1da177e4 LT |
1483 | task_lock(current->group_leader); |
1484 | *old_rlim = new_rlim; | |
1485 | task_unlock(current->group_leader); | |
1486 | ||
ec9e16ba AM |
1487 | if (resource != RLIMIT_CPU) |
1488 | goto out; | |
d3561f78 AM |
1489 | |
1490 | /* | |
1491 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1492 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1493 | * very long-standing error, and fixing it now risks breakage of | |
1494 | * applications, so we live with it | |
1495 | */ | |
ec9e16ba AM |
1496 | if (new_rlim.rlim_cur == RLIM_INFINITY) |
1497 | goto out; | |
1498 | ||
1499 | it_prof_secs = cputime_to_secs(current->signal->it_prof_expires); | |
1500 | if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) { | |
e0661111 AM |
1501 | unsigned long rlim_cur = new_rlim.rlim_cur; |
1502 | cputime_t cputime; | |
ec9e16ba | 1503 | |
e0661111 | 1504 | cputime = secs_to_cputime(rlim_cur); |
1da177e4 LT |
1505 | read_lock(&tasklist_lock); |
1506 | spin_lock_irq(¤t->sighand->siglock); | |
ec9e16ba | 1507 | set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL); |
1da177e4 LT |
1508 | spin_unlock_irq(¤t->sighand->siglock); |
1509 | read_unlock(&tasklist_lock); | |
1510 | } | |
ec9e16ba | 1511 | out: |
1da177e4 LT |
1512 | return 0; |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * It would make sense to put struct rusage in the task_struct, | |
1517 | * except that would make the task_struct be *really big*. After | |
1518 | * task_struct gets moved into malloc'ed memory, it would | |
1519 | * make sense to do this. It will make moving the rest of the information | |
1520 | * a lot simpler! (Which we're not doing right now because we're not | |
1521 | * measuring them yet). | |
1522 | * | |
1da177e4 LT |
1523 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1524 | * races with threads incrementing their own counters. But since word | |
1525 | * reads are atomic, we either get new values or old values and we don't | |
1526 | * care which for the sums. We always take the siglock to protect reading | |
1527 | * the c* fields from p->signal from races with exit.c updating those | |
1528 | * fields when reaping, so a sample either gets all the additions of a | |
1529 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1530 | * |
de047c1b RT |
1531 | * Locking: |
1532 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1533 | * for the cases current multithreaded, non-current single threaded | |
1534 | * non-current multithreaded. Thread traversal is now safe with | |
1535 | * the siglock held. | |
1536 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1537 | * single threaded, as no one else can take our signal_struct away, no one | |
1538 | * else can reap the children to update signal->c* counters, and no one else | |
1539 | * can race with the signal-> fields. If we do not take any lock, the | |
1540 | * signal-> fields could be read out of order while another thread was just | |
1541 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1542 | * On the writer side, write memory barrier is implied in __exit_signal | |
1543 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1544 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1545 | * |
1da177e4 LT |
1546 | */ |
1547 | ||
1548 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) | |
1549 | { | |
1550 | struct task_struct *t; | |
1551 | unsigned long flags; | |
1552 | cputime_t utime, stime; | |
1553 | ||
1554 | memset((char *) r, 0, sizeof *r); | |
2dd0ebcd | 1555 | utime = stime = cputime_zero; |
1da177e4 | 1556 | |
de047c1b RT |
1557 | rcu_read_lock(); |
1558 | if (!lock_task_sighand(p, &flags)) { | |
1559 | rcu_read_unlock(); | |
1560 | return; | |
1561 | } | |
0f59cc4a | 1562 | |
1da177e4 | 1563 | switch (who) { |
0f59cc4a | 1564 | case RUSAGE_BOTH: |
1da177e4 | 1565 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1566 | utime = p->signal->cutime; |
1567 | stime = p->signal->cstime; | |
1568 | r->ru_nvcsw = p->signal->cnvcsw; | |
1569 | r->ru_nivcsw = p->signal->cnivcsw; | |
1570 | r->ru_minflt = p->signal->cmin_flt; | |
1571 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1572 | r->ru_inblock = p->signal->cinblock; |
1573 | r->ru_oublock = p->signal->coublock; | |
0f59cc4a ON |
1574 | |
1575 | if (who == RUSAGE_CHILDREN) | |
1576 | break; | |
1577 | ||
1da177e4 | 1578 | case RUSAGE_SELF: |
1da177e4 LT |
1579 | utime = cputime_add(utime, p->signal->utime); |
1580 | stime = cputime_add(stime, p->signal->stime); | |
1581 | r->ru_nvcsw += p->signal->nvcsw; | |
1582 | r->ru_nivcsw += p->signal->nivcsw; | |
1583 | r->ru_minflt += p->signal->min_flt; | |
1584 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1585 | r->ru_inblock += p->signal->inblock; |
1586 | r->ru_oublock += p->signal->oublock; | |
1da177e4 LT |
1587 | t = p; |
1588 | do { | |
1589 | utime = cputime_add(utime, t->utime); | |
1590 | stime = cputime_add(stime, t->stime); | |
1591 | r->ru_nvcsw += t->nvcsw; | |
1592 | r->ru_nivcsw += t->nivcsw; | |
1593 | r->ru_minflt += t->min_flt; | |
1594 | r->ru_majflt += t->maj_flt; | |
6eaeeaba ED |
1595 | r->ru_inblock += task_io_get_inblock(t); |
1596 | r->ru_oublock += task_io_get_oublock(t); | |
1da177e4 LT |
1597 | t = next_thread(t); |
1598 | } while (t != p); | |
1da177e4 | 1599 | break; |
0f59cc4a | 1600 | |
1da177e4 LT |
1601 | default: |
1602 | BUG(); | |
1603 | } | |
0f59cc4a | 1604 | |
de047c1b RT |
1605 | unlock_task_sighand(p, &flags); |
1606 | rcu_read_unlock(); | |
1607 | ||
0f59cc4a ON |
1608 | cputime_to_timeval(utime, &r->ru_utime); |
1609 | cputime_to_timeval(stime, &r->ru_stime); | |
1da177e4 LT |
1610 | } |
1611 | ||
1612 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1613 | { | |
1614 | struct rusage r; | |
1da177e4 | 1615 | k_getrusage(p, who, &r); |
1da177e4 LT |
1616 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1617 | } | |
1618 | ||
1619 | asmlinkage long sys_getrusage(int who, struct rusage __user *ru) | |
1620 | { | |
1621 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) | |
1622 | return -EINVAL; | |
1623 | return getrusage(current, who, ru); | |
1624 | } | |
1625 | ||
1626 | asmlinkage long sys_umask(int mask) | |
1627 | { | |
1628 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1629 | return mask; | |
1630 | } | |
3b7391de | 1631 | |
1da177e4 LT |
1632 | asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, |
1633 | unsigned long arg4, unsigned long arg5) | |
1634 | { | |
1635 | long error; | |
1da177e4 LT |
1636 | |
1637 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); | |
1638 | if (error) | |
1639 | return error; | |
1640 | ||
1641 | switch (option) { | |
1642 | case PR_SET_PDEATHSIG: | |
0730ded5 | 1643 | if (!valid_signal(arg2)) { |
1da177e4 LT |
1644 | error = -EINVAL; |
1645 | break; | |
1646 | } | |
0730ded5 | 1647 | current->pdeath_signal = arg2; |
1da177e4 LT |
1648 | break; |
1649 | case PR_GET_PDEATHSIG: | |
1650 | error = put_user(current->pdeath_signal, (int __user *)arg2); | |
1651 | break; | |
1652 | case PR_GET_DUMPABLE: | |
6c5d5238 | 1653 | error = get_dumpable(current->mm); |
1da177e4 LT |
1654 | break; |
1655 | case PR_SET_DUMPABLE: | |
abf75a50 | 1656 | if (arg2 < 0 || arg2 > 1) { |
1da177e4 LT |
1657 | error = -EINVAL; |
1658 | break; | |
1659 | } | |
6c5d5238 | 1660 | set_dumpable(current->mm, arg2); |
1da177e4 LT |
1661 | break; |
1662 | ||
1663 | case PR_SET_UNALIGN: | |
1664 | error = SET_UNALIGN_CTL(current, arg2); | |
1665 | break; | |
1666 | case PR_GET_UNALIGN: | |
1667 | error = GET_UNALIGN_CTL(current, arg2); | |
1668 | break; | |
1669 | case PR_SET_FPEMU: | |
1670 | error = SET_FPEMU_CTL(current, arg2); | |
1671 | break; | |
1672 | case PR_GET_FPEMU: | |
1673 | error = GET_FPEMU_CTL(current, arg2); | |
1674 | break; | |
1675 | case PR_SET_FPEXC: | |
1676 | error = SET_FPEXC_CTL(current, arg2); | |
1677 | break; | |
1678 | case PR_GET_FPEXC: | |
1679 | error = GET_FPEXC_CTL(current, arg2); | |
1680 | break; | |
1681 | case PR_GET_TIMING: | |
1682 | error = PR_TIMING_STATISTICAL; | |
1683 | break; | |
1684 | case PR_SET_TIMING: | |
1685 | if (arg2 == PR_TIMING_STATISTICAL) | |
1686 | error = 0; | |
1687 | else | |
1688 | error = -EINVAL; | |
1689 | break; | |
1690 | ||
1691 | case PR_GET_KEEPCAPS: | |
1692 | if (current->keep_capabilities) | |
1693 | error = 1; | |
1694 | break; | |
1695 | case PR_SET_KEEPCAPS: | |
1696 | if (arg2 != 0 && arg2 != 1) { | |
1697 | error = -EINVAL; | |
1698 | break; | |
1699 | } | |
1700 | current->keep_capabilities = arg2; | |
1701 | break; | |
1702 | case PR_SET_NAME: { | |
1703 | struct task_struct *me = current; | |
1704 | unsigned char ncomm[sizeof(me->comm)]; | |
1705 | ||
1706 | ncomm[sizeof(me->comm)-1] = 0; | |
1707 | if (strncpy_from_user(ncomm, (char __user *)arg2, | |
1708 | sizeof(me->comm)-1) < 0) | |
1709 | return -EFAULT; | |
1710 | set_task_comm(me, ncomm); | |
1711 | return 0; | |
1712 | } | |
1713 | case PR_GET_NAME: { | |
1714 | struct task_struct *me = current; | |
1715 | unsigned char tcomm[sizeof(me->comm)]; | |
1716 | ||
1717 | get_task_comm(tcomm, me); | |
1718 | if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm))) | |
1719 | return -EFAULT; | |
1720 | return 0; | |
1721 | } | |
651d765d AB |
1722 | case PR_GET_ENDIAN: |
1723 | error = GET_ENDIAN(current, arg2); | |
1724 | break; | |
1725 | case PR_SET_ENDIAN: | |
1726 | error = SET_ENDIAN(current, arg2); | |
1727 | break; | |
1728 | ||
1d9d02fe AA |
1729 | case PR_GET_SECCOMP: |
1730 | error = prctl_get_seccomp(); | |
1731 | break; | |
1732 | case PR_SET_SECCOMP: | |
1733 | error = prctl_set_seccomp(arg2); | |
1734 | break; | |
1735 | ||
3b7391de SH |
1736 | case PR_CAPBSET_READ: |
1737 | if (!cap_valid(arg2)) | |
1738 | return -EINVAL; | |
1739 | return !!cap_raised(current->cap_bset, arg2); | |
1740 | case PR_CAPBSET_DROP: | |
1741 | #ifdef CONFIG_SECURITY_FILE_CAPABILITIES | |
1742 | return cap_prctl_drop(arg2); | |
1743 | #else | |
1744 | return -EINVAL; | |
1745 | #endif | |
8fb402bc EB |
1746 | case PR_GET_TSC: |
1747 | error = GET_TSC_CTL(arg2); | |
1748 | break; | |
1749 | case PR_SET_TSC: | |
1750 | error = SET_TSC_CTL(arg2); | |
1751 | break; | |
1da177e4 LT |
1752 | default: |
1753 | error = -EINVAL; | |
1754 | break; | |
1755 | } | |
1756 | return error; | |
1757 | } | |
3cfc348b AK |
1758 | |
1759 | asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, | |
4307d1e5 | 1760 | struct getcpu_cache __user *unused) |
3cfc348b AK |
1761 | { |
1762 | int err = 0; | |
1763 | int cpu = raw_smp_processor_id(); | |
1764 | if (cpup) | |
1765 | err |= put_user(cpu, cpup); | |
1766 | if (nodep) | |
1767 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
1768 | return err ? -EFAULT : 0; |
1769 | } | |
10a0a8d4 JF |
1770 | |
1771 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; | |
1772 | ||
1773 | static void argv_cleanup(char **argv, char **envp) | |
1774 | { | |
1775 | argv_free(argv); | |
1776 | } | |
1777 | ||
1778 | /** | |
1779 | * orderly_poweroff - Trigger an orderly system poweroff | |
1780 | * @force: force poweroff if command execution fails | |
1781 | * | |
1782 | * This may be called from any context to trigger a system shutdown. | |
1783 | * If the orderly shutdown fails, it will force an immediate shutdown. | |
1784 | */ | |
1785 | int orderly_poweroff(bool force) | |
1786 | { | |
1787 | int argc; | |
1788 | char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); | |
1789 | static char *envp[] = { | |
1790 | "HOME=/", | |
1791 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
1792 | NULL | |
1793 | }; | |
1794 | int ret = -ENOMEM; | |
1795 | struct subprocess_info *info; | |
1796 | ||
1797 | if (argv == NULL) { | |
1798 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", | |
1799 | __func__, poweroff_cmd); | |
1800 | goto out; | |
1801 | } | |
1802 | ||
1803 | info = call_usermodehelper_setup(argv[0], argv, envp); | |
1804 | if (info == NULL) { | |
1805 | argv_free(argv); | |
1806 | goto out; | |
1807 | } | |
1808 | ||
1809 | call_usermodehelper_setcleanup(info, argv_cleanup); | |
1810 | ||
86313c48 | 1811 | ret = call_usermodehelper_exec(info, UMH_NO_WAIT); |
10a0a8d4 JF |
1812 | |
1813 | out: | |
1814 | if (ret && force) { | |
1815 | printk(KERN_WARNING "Failed to start orderly shutdown: " | |
1816 | "forcing the issue\n"); | |
1817 | ||
1818 | /* I guess this should try to kick off some daemon to | |
1819 | sync and poweroff asap. Or not even bother syncing | |
1820 | if we're doing an emergency shutdown? */ | |
1821 | emergency_sync(); | |
1822 | kernel_power_off(); | |
1823 | } | |
1824 | ||
1825 | return ret; | |
1826 | } | |
1827 | EXPORT_SYMBOL_GPL(orderly_poweroff); |