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Blackfin: punt Blackfin-specific GPIO wakeup API
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blobb1258304775796ec0946fbdc749dc84bc43c675a
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/signal.h>
27 #include <linux/proc_fs.h>
28 #include <linux/security.h>
29 #include <linux/ctype.h>
30 #include <linux/kmemcheck.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/ratelimit.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.h>
54 #include <linux/kprobes.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/processor.h>
58
59 #ifdef CONFIG_X86
60 #include <asm/nmi.h>
61 #include <asm/stacktrace.h>
62 #include <asm/io.h>
63 #endif
64 #ifdef CONFIG_BSD_PROCESS_ACCT
65 #include <linux/acct.h>
66 #endif
67 #ifdef CONFIG_RT_MUTEXES
68 #include <linux/rtmutex.h>
69 #endif
70 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
71 #include <linux/lockdep.h>
72 #endif
73 #ifdef CONFIG_CHR_DEV_SG
74 #include <scsi/sg.h>
75 #endif
76
77
78 #if defined(CONFIG_SYSCTL)
79
80 /* External variables not in a header file. */
81 extern int sysctl_overcommit_memory;
82 extern int sysctl_overcommit_ratio;
83 extern int sysctl_panic_on_oom;
84 extern int sysctl_oom_kill_allocating_task;
85 extern int sysctl_oom_dump_tasks;
86 extern int max_threads;
87 extern int core_uses_pid;
88 extern int suid_dumpable;
89 extern char core_pattern[];
90 extern unsigned int core_pipe_limit;
91 extern int pid_max;
92 extern int min_free_kbytes;
93 extern int pid_max_min, pid_max_max;
94 extern int sysctl_drop_caches;
95 extern int percpu_pagelist_fraction;
96 extern int compat_log;
97 extern int latencytop_enabled;
98 extern int sysctl_nr_open_min, sysctl_nr_open_max;
99 #ifndef CONFIG_MMU
100 extern int sysctl_nr_trim_pages;
101 #endif
102 #ifdef CONFIG_BLOCK
103 extern int blk_iopoll_enabled;
104 #endif
105
106 /* Constants used for minimum and maximum */
107 #ifdef CONFIG_DETECT_SOFTLOCKUP
108 static int sixty = 60;
109 static int neg_one = -1;
110 #endif
111
112 static int zero;
113 static int __maybe_unused one = 1;
114 static int __maybe_unused two = 2;
115 static unsigned long one_ul = 1;
116 static int one_hundred = 100;
117 #ifdef CONFIG_PRINTK
118 static int ten_thousand = 10000;
119 #endif
120
121 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
122 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
123
124 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
125 static int maxolduid = 65535;
126 static int minolduid;
127 static int min_percpu_pagelist_fract = 8;
128
129 static int ngroups_max = NGROUPS_MAX;
130
131 #ifdef CONFIG_SPARC
132 #include <asm/system.h>
133 #endif
134
135 #ifdef CONFIG_SPARC64
136 extern int sysctl_tsb_ratio;
137 #endif
138
139 #ifdef __hppa__
140 extern int pwrsw_enabled;
141 extern int unaligned_enabled;
142 #endif
143
144 #ifdef CONFIG_S390
145 #ifdef CONFIG_MATHEMU
146 extern int sysctl_ieee_emulation_warnings;
147 #endif
148 extern int sysctl_userprocess_debug;
149 extern int spin_retry;
150 #endif
151
152 #ifdef CONFIG_IA64
153 extern int no_unaligned_warning;
154 extern int unaligned_dump_stack;
155 #endif
156
157 extern struct ratelimit_state printk_ratelimit_state;
158
159 #ifdef CONFIG_PROC_SYSCTL
160 static int proc_do_cad_pid(struct ctl_table *table, int write,
161 void __user *buffer, size_t *lenp, loff_t *ppos);
162 static int proc_taint(struct ctl_table *table, int write,
163 void __user *buffer, size_t *lenp, loff_t *ppos);
164 #endif
165
166 #ifdef CONFIG_MAGIC_SYSRQ
167 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
168
169 static int sysrq_sysctl_handler(ctl_table *table, int write,
170 void __user *buffer, size_t *lenp,
171 loff_t *ppos)
172 {
173 int error;
174
175 error = proc_dointvec(table, write, buffer, lenp, ppos);
176 if (error)
177 return error;
178
179 if (write)
180 sysrq_toggle_support(__sysrq_enabled);
181
182 return 0;
183 }
184
185 #endif
186
187 static struct ctl_table root_table[];
188 static struct ctl_table_root sysctl_table_root;
189 static struct ctl_table_header root_table_header = {
190 .count = 1,
191 .ctl_table = root_table,
192 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
193 .root = &sysctl_table_root,
194 .set = &sysctl_table_root.default_set,
195 };
196 static struct ctl_table_root sysctl_table_root = {
197 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
198 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
199 };
200
201 static struct ctl_table kern_table[];
202 static struct ctl_table vm_table[];
203 static struct ctl_table fs_table[];
204 static struct ctl_table debug_table[];
205 static struct ctl_table dev_table[];
206 extern struct ctl_table random_table[];
207 #ifdef CONFIG_INOTIFY_USER
208 extern struct ctl_table inotify_table[];
209 #endif
210 #ifdef CONFIG_EPOLL
211 extern struct ctl_table epoll_table[];
212 #endif
213
214 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
215 int sysctl_legacy_va_layout;
216 #endif
217
218 /* The default sysctl tables: */
219
220 static struct ctl_table root_table[] = {
221 {
222 .procname = "kernel",
223 .mode = 0555,
224 .child = kern_table,
225 },
226 {
227 .procname = "vm",
228 .mode = 0555,
229 .child = vm_table,
230 },
231 {
232 .procname = "fs",
233 .mode = 0555,
234 .child = fs_table,
235 },
236 {
237 .procname = "debug",
238 .mode = 0555,
239 .child = debug_table,
240 },
241 {
242 .procname = "dev",
243 .mode = 0555,
244 .child = dev_table,
245 },
246 /*
247 * NOTE: do not add new entries to this table unless you have read
248 * Documentation/sysctl/ctl_unnumbered.txt
249 */
250 { }
251 };
252
253 #ifdef CONFIG_SCHED_DEBUG
254 static int min_sched_granularity_ns = 100000; /* 100 usecs */
255 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
256 static int min_wakeup_granularity_ns; /* 0 usecs */
257 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
258 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
259 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
260 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
261 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
262 #endif
263
264 static struct ctl_table kern_table[] = {
265 {
266 .procname = "sched_child_runs_first",
267 .data = &sysctl_sched_child_runs_first,
268 .maxlen = sizeof(unsigned int),
269 .mode = 0644,
270 .proc_handler = proc_dointvec,
271 },
272 #ifdef CONFIG_SCHED_DEBUG
273 {
274 .procname = "sched_min_granularity_ns",
275 .data = &sysctl_sched_min_granularity,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = sched_proc_update_handler,
279 .extra1 = &min_sched_granularity_ns,
280 .extra2 = &max_sched_granularity_ns,
281 },
282 {
283 .procname = "sched_latency_ns",
284 .data = &sysctl_sched_latency,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = sched_proc_update_handler,
288 .extra1 = &min_sched_granularity_ns,
289 .extra2 = &max_sched_granularity_ns,
290 },
291 {
292 .procname = "sched_wakeup_granularity_ns",
293 .data = &sysctl_sched_wakeup_granularity,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_wakeup_granularity_ns,
298 .extra2 = &max_wakeup_granularity_ns,
299 },
300 {
301 .procname = "sched_shares_ratelimit",
302 .data = &sysctl_sched_shares_ratelimit,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = sched_proc_update_handler,
306 .extra1 = &min_sched_shares_ratelimit,
307 .extra2 = &max_sched_shares_ratelimit,
308 },
309 {
310 .procname = "sched_tunable_scaling",
311 .data = &sysctl_sched_tunable_scaling,
312 .maxlen = sizeof(enum sched_tunable_scaling),
313 .mode = 0644,
314 .proc_handler = sched_proc_update_handler,
315 .extra1 = &min_sched_tunable_scaling,
316 .extra2 = &max_sched_tunable_scaling,
317 },
318 {
319 .procname = "sched_shares_thresh",
320 .data = &sysctl_sched_shares_thresh,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec_minmax,
324 .extra1 = &zero,
325 },
326 {
327 .procname = "sched_migration_cost",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_time_avg",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec_minmax,
353 .extra1 = &zero,
354 .extra2 = &one,
355 },
356 #endif
357 {
358 .procname = "sched_rt_period_us",
359 .data = &sysctl_sched_rt_period,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = sched_rt_handler,
363 },
364 {
365 .procname = "sched_rt_runtime_us",
366 .data = &sysctl_sched_rt_runtime,
367 .maxlen = sizeof(int),
368 .mode = 0644,
369 .proc_handler = sched_rt_handler,
370 },
371 {
372 .procname = "sched_compat_yield",
373 .data = &sysctl_sched_compat_yield,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 #ifdef CONFIG_PROVE_LOCKING
379 {
380 .procname = "prove_locking",
381 .data = &prove_locking,
382 .maxlen = sizeof(int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec,
385 },
386 #endif
387 #ifdef CONFIG_LOCK_STAT
388 {
389 .procname = "lock_stat",
390 .data = &lock_stat,
391 .maxlen = sizeof(int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 #endif
396 {
397 .procname = "panic",
398 .data = &panic_timeout,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = proc_dointvec,
402 },
403 {
404 .procname = "core_uses_pid",
405 .data = &core_uses_pid,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec,
409 },
410 {
411 .procname = "core_pattern",
412 .data = core_pattern,
413 .maxlen = CORENAME_MAX_SIZE,
414 .mode = 0644,
415 .proc_handler = proc_dostring,
416 },
417 {
418 .procname = "core_pipe_limit",
419 .data = &core_pipe_limit,
420 .maxlen = sizeof(unsigned int),
421 .mode = 0644,
422 .proc_handler = proc_dointvec,
423 },
424 #ifdef CONFIG_PROC_SYSCTL
425 {
426 .procname = "tainted",
427 .maxlen = sizeof(long),
428 .mode = 0644,
429 .proc_handler = proc_taint,
430 },
431 #endif
432 #ifdef CONFIG_LATENCYTOP
433 {
434 .procname = "latencytop",
435 .data = &latencytop_enabled,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec,
439 },
440 #endif
441 #ifdef CONFIG_BLK_DEV_INITRD
442 {
443 .procname = "real-root-dev",
444 .data = &real_root_dev,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec,
448 },
449 #endif
450 {
451 .procname = "print-fatal-signals",
452 .data = &print_fatal_signals,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec,
456 },
457 #ifdef CONFIG_SPARC
458 {
459 .procname = "reboot-cmd",
460 .data = reboot_command,
461 .maxlen = 256,
462 .mode = 0644,
463 .proc_handler = proc_dostring,
464 },
465 {
466 .procname = "stop-a",
467 .data = &stop_a_enabled,
468 .maxlen = sizeof (int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec,
471 },
472 {
473 .procname = "scons-poweroff",
474 .data = &scons_pwroff,
475 .maxlen = sizeof (int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 #endif
480 #ifdef CONFIG_SPARC64
481 {
482 .procname = "tsb-ratio",
483 .data = &sysctl_tsb_ratio,
484 .maxlen = sizeof (int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec,
487 },
488 #endif
489 #ifdef __hppa__
490 {
491 .procname = "soft-power",
492 .data = &pwrsw_enabled,
493 .maxlen = sizeof (int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec,
496 },
497 {
498 .procname = "unaligned-trap",
499 .data = &unaligned_enabled,
500 .maxlen = sizeof (int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 #endif
505 {
506 .procname = "ctrl-alt-del",
507 .data = &C_A_D,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec,
511 },
512 #ifdef CONFIG_FUNCTION_TRACER
513 {
514 .procname = "ftrace_enabled",
515 .data = &ftrace_enabled,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = ftrace_enable_sysctl,
519 },
520 #endif
521 #ifdef CONFIG_STACK_TRACER
522 {
523 .procname = "stack_tracer_enabled",
524 .data = &stack_tracer_enabled,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = stack_trace_sysctl,
528 },
529 #endif
530 #ifdef CONFIG_TRACING
531 {
532 .procname = "ftrace_dump_on_oops",
533 .data = &ftrace_dump_on_oops,
534 .maxlen = sizeof(int),
535 .mode = 0644,
536 .proc_handler = proc_dointvec,
537 },
538 #endif
539 #ifdef CONFIG_MODULES
540 {
541 .procname = "modprobe",
542 .data = &modprobe_path,
543 .maxlen = KMOD_PATH_LEN,
544 .mode = 0644,
545 .proc_handler = proc_dostring,
546 },
547 {
548 .procname = "modules_disabled",
549 .data = &modules_disabled,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 /* only handle a transition from default "0" to "1" */
553 .proc_handler = proc_dointvec_minmax,
554 .extra1 = &one,
555 .extra2 = &one,
556 },
557 #endif
558 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
559 {
560 .procname = "hotplug",
561 .data = &uevent_helper,
562 .maxlen = UEVENT_HELPER_PATH_LEN,
563 .mode = 0644,
564 .proc_handler = proc_dostring,
565 },
566 #endif
567 #ifdef CONFIG_CHR_DEV_SG
568 {
569 .procname = "sg-big-buff",
570 .data = &sg_big_buff,
571 .maxlen = sizeof (int),
572 .mode = 0444,
573 .proc_handler = proc_dointvec,
574 },
575 #endif
576 #ifdef CONFIG_BSD_PROCESS_ACCT
577 {
578 .procname = "acct",
579 .data = &acct_parm,
580 .maxlen = 3*sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584 #endif
585 #ifdef CONFIG_MAGIC_SYSRQ
586 {
587 .procname = "sysrq",
588 .data = &__sysrq_enabled,
589 .maxlen = sizeof (int),
590 .mode = 0644,
591 .proc_handler = sysrq_sysctl_handler,
592 },
593 #endif
594 #ifdef CONFIG_PROC_SYSCTL
595 {
596 .procname = "cad_pid",
597 .data = NULL,
598 .maxlen = sizeof (int),
599 .mode = 0600,
600 .proc_handler = proc_do_cad_pid,
601 },
602 #endif
603 {
604 .procname = "threads-max",
605 .data = &max_threads,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 {
611 .procname = "random",
612 .mode = 0555,
613 .child = random_table,
614 },
615 {
616 .procname = "overflowuid",
617 .data = &overflowuid,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_minmax,
621 .extra1 = &minolduid,
622 .extra2 = &maxolduid,
623 },
624 {
625 .procname = "overflowgid",
626 .data = &overflowgid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
633 #ifdef CONFIG_S390
634 #ifdef CONFIG_MATHEMU
635 {
636 .procname = "ieee_emulation_warnings",
637 .data = &sysctl_ieee_emulation_warnings,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 #endif
643 {
644 .procname = "userprocess_debug",
645 .data = &show_unhandled_signals,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 #endif
651 {
652 .procname = "pid_max",
653 .data = &pid_max,
654 .maxlen = sizeof (int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec_minmax,
657 .extra1 = &pid_max_min,
658 .extra2 = &pid_max_max,
659 },
660 {
661 .procname = "panic_on_oops",
662 .data = &panic_on_oops,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 .proc_handler = proc_dointvec,
666 },
667 #if defined CONFIG_PRINTK
668 {
669 .procname = "printk",
670 .data = &console_loglevel,
671 .maxlen = 4*sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 {
676 .procname = "printk_ratelimit",
677 .data = &printk_ratelimit_state.interval,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec_jiffies,
681 },
682 {
683 .procname = "printk_ratelimit_burst",
684 .data = &printk_ratelimit_state.burst,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec,
688 },
689 {
690 .procname = "printk_delay",
691 .data = &printk_delay_msec,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec_minmax,
695 .extra1 = &zero,
696 .extra2 = &ten_thousand,
697 },
698 #endif
699 {
700 .procname = "ngroups_max",
701 .data = &ngroups_max,
702 .maxlen = sizeof (int),
703 .mode = 0444,
704 .proc_handler = proc_dointvec,
705 },
706 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
707 {
708 .procname = "unknown_nmi_panic",
709 .data = &unknown_nmi_panic,
710 .maxlen = sizeof (int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec,
713 },
714 {
715 .procname = "nmi_watchdog",
716 .data = &nmi_watchdog_enabled,
717 .maxlen = sizeof (int),
718 .mode = 0644,
719 .proc_handler = proc_nmi_enabled,
720 },
721 #endif
722 #if defined(CONFIG_X86)
723 {
724 .procname = "panic_on_unrecovered_nmi",
725 .data = &panic_on_unrecovered_nmi,
726 .maxlen = sizeof(int),
727 .mode = 0644,
728 .proc_handler = proc_dointvec,
729 },
730 {
731 .procname = "panic_on_io_nmi",
732 .data = &panic_on_io_nmi,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dointvec,
736 },
737 {
738 .procname = "bootloader_type",
739 .data = &bootloader_type,
740 .maxlen = sizeof (int),
741 .mode = 0444,
742 .proc_handler = proc_dointvec,
743 },
744 {
745 .procname = "bootloader_version",
746 .data = &bootloader_version,
747 .maxlen = sizeof (int),
748 .mode = 0444,
749 .proc_handler = proc_dointvec,
750 },
751 {
752 .procname = "kstack_depth_to_print",
753 .data = &kstack_depth_to_print,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec,
757 },
758 {
759 .procname = "io_delay_type",
760 .data = &io_delay_type,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec,
764 },
765 #endif
766 #if defined(CONFIG_MMU)
767 {
768 .procname = "randomize_va_space",
769 .data = &randomize_va_space,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = proc_dointvec,
773 },
774 #endif
775 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
776 {
777 .procname = "spin_retry",
778 .data = &spin_retry,
779 .maxlen = sizeof (int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec,
782 },
783 #endif
784 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
785 {
786 .procname = "acpi_video_flags",
787 .data = &acpi_realmode_flags,
788 .maxlen = sizeof (unsigned long),
789 .mode = 0644,
790 .proc_handler = proc_doulongvec_minmax,
791 },
792 #endif
793 #ifdef CONFIG_IA64
794 {
795 .procname = "ignore-unaligned-usertrap",
796 .data = &no_unaligned_warning,
797 .maxlen = sizeof (int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "unaligned-dump-stack",
803 .data = &unaligned_dump_stack,
804 .maxlen = sizeof (int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808 #endif
809 #ifdef CONFIG_DETECT_SOFTLOCKUP
810 {
811 .procname = "softlockup_panic",
812 .data = &softlockup_panic,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec_minmax,
816 .extra1 = &zero,
817 .extra2 = &one,
818 },
819 {
820 .procname = "softlockup_thresh",
821 .data = &softlockup_thresh,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dosoftlockup_thresh,
825 .extra1 = &neg_one,
826 .extra2 = &sixty,
827 },
828 #endif
829 #ifdef CONFIG_DETECT_HUNG_TASK
830 {
831 .procname = "hung_task_panic",
832 .data = &sysctl_hung_task_panic,
833 .maxlen = sizeof(int),
834 .mode = 0644,
835 .proc_handler = proc_dointvec_minmax,
836 .extra1 = &zero,
837 .extra2 = &one,
838 },
839 {
840 .procname = "hung_task_check_count",
841 .data = &sysctl_hung_task_check_count,
842 .maxlen = sizeof(unsigned long),
843 .mode = 0644,
844 .proc_handler = proc_doulongvec_minmax,
845 },
846 {
847 .procname = "hung_task_timeout_secs",
848 .data = &sysctl_hung_task_timeout_secs,
849 .maxlen = sizeof(unsigned long),
850 .mode = 0644,
851 .proc_handler = proc_dohung_task_timeout_secs,
852 },
853 {
854 .procname = "hung_task_warnings",
855 .data = &sysctl_hung_task_warnings,
856 .maxlen = sizeof(unsigned long),
857 .mode = 0644,
858 .proc_handler = proc_doulongvec_minmax,
859 },
860 #endif
861 #ifdef CONFIG_COMPAT
862 {
863 .procname = "compat-log",
864 .data = &compat_log,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869 #endif
870 #ifdef CONFIG_RT_MUTEXES
871 {
872 .procname = "max_lock_depth",
873 .data = &max_lock_depth,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec,
877 },
878 #endif
879 {
880 .procname = "poweroff_cmd",
881 .data = &poweroff_cmd,
882 .maxlen = POWEROFF_CMD_PATH_LEN,
883 .mode = 0644,
884 .proc_handler = proc_dostring,
885 },
886 #ifdef CONFIG_KEYS
887 {
888 .procname = "keys",
889 .mode = 0555,
890 .child = key_sysctls,
891 },
892 #endif
893 #ifdef CONFIG_RCU_TORTURE_TEST
894 {
895 .procname = "rcutorture_runnable",
896 .data = &rcutorture_runnable,
897 .maxlen = sizeof(int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec,
900 },
901 #endif
902 #ifdef CONFIG_SLOW_WORK
903 {
904 .procname = "slow-work",
905 .mode = 0555,
906 .child = slow_work_sysctls,
907 },
908 #endif
909 #ifdef CONFIG_PERF_EVENTS
910 {
911 .procname = "perf_event_paranoid",
912 .data = &sysctl_perf_event_paranoid,
913 .maxlen = sizeof(sysctl_perf_event_paranoid),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917 {
918 .procname = "perf_event_mlock_kb",
919 .data = &sysctl_perf_event_mlock,
920 .maxlen = sizeof(sysctl_perf_event_mlock),
921 .mode = 0644,
922 .proc_handler = proc_dointvec,
923 },
924 {
925 .procname = "perf_event_max_sample_rate",
926 .data = &sysctl_perf_event_sample_rate,
927 .maxlen = sizeof(sysctl_perf_event_sample_rate),
928 .mode = 0644,
929 .proc_handler = proc_dointvec,
930 },
931 #endif
932 #ifdef CONFIG_KMEMCHECK
933 {
934 .procname = "kmemcheck",
935 .data = &kmemcheck_enabled,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec,
939 },
940 #endif
941 #ifdef CONFIG_BLOCK
942 {
943 .procname = "blk_iopoll",
944 .data = &blk_iopoll_enabled,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949 #endif
950 /*
951 * NOTE: do not add new entries to this table unless you have read
952 * Documentation/sysctl/ctl_unnumbered.txt
953 */
954 { }
955 };
956
957 static struct ctl_table vm_table[] = {
958 {
959 .procname = "overcommit_memory",
960 .data = &sysctl_overcommit_memory,
961 .maxlen = sizeof(sysctl_overcommit_memory),
962 .mode = 0644,
963 .proc_handler = proc_dointvec,
964 },
965 {
966 .procname = "panic_on_oom",
967 .data = &sysctl_panic_on_oom,
968 .maxlen = sizeof(sysctl_panic_on_oom),
969 .mode = 0644,
970 .proc_handler = proc_dointvec,
971 },
972 {
973 .procname = "oom_kill_allocating_task",
974 .data = &sysctl_oom_kill_allocating_task,
975 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
976 .mode = 0644,
977 .proc_handler = proc_dointvec,
978 },
979 {
980 .procname = "oom_dump_tasks",
981 .data = &sysctl_oom_dump_tasks,
982 .maxlen = sizeof(sysctl_oom_dump_tasks),
983 .mode = 0644,
984 .proc_handler = proc_dointvec,
985 },
986 {
987 .procname = "overcommit_ratio",
988 .data = &sysctl_overcommit_ratio,
989 .maxlen = sizeof(sysctl_overcommit_ratio),
990 .mode = 0644,
991 .proc_handler = proc_dointvec,
992 },
993 {
994 .procname = "page-cluster",
995 .data = &page_cluster,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec,
999 },
1000 {
1001 .procname = "dirty_background_ratio",
1002 .data = &dirty_background_ratio,
1003 .maxlen = sizeof(dirty_background_ratio),
1004 .mode = 0644,
1005 .proc_handler = dirty_background_ratio_handler,
1006 .extra1 = &zero,
1007 .extra2 = &one_hundred,
1008 },
1009 {
1010 .procname = "dirty_background_bytes",
1011 .data = &dirty_background_bytes,
1012 .maxlen = sizeof(dirty_background_bytes),
1013 .mode = 0644,
1014 .proc_handler = dirty_background_bytes_handler,
1015 .extra1 = &one_ul,
1016 },
1017 {
1018 .procname = "dirty_ratio",
1019 .data = &vm_dirty_ratio,
1020 .maxlen = sizeof(vm_dirty_ratio),
1021 .mode = 0644,
1022 .proc_handler = dirty_ratio_handler,
1023 .extra1 = &zero,
1024 .extra2 = &one_hundred,
1025 },
1026 {
1027 .procname = "dirty_bytes",
1028 .data = &vm_dirty_bytes,
1029 .maxlen = sizeof(vm_dirty_bytes),
1030 .mode = 0644,
1031 .proc_handler = dirty_bytes_handler,
1032 .extra1 = &dirty_bytes_min,
1033 },
1034 {
1035 .procname = "dirty_writeback_centisecs",
1036 .data = &dirty_writeback_interval,
1037 .maxlen = sizeof(dirty_writeback_interval),
1038 .mode = 0644,
1039 .proc_handler = dirty_writeback_centisecs_handler,
1040 },
1041 {
1042 .procname = "dirty_expire_centisecs",
1043 .data = &dirty_expire_interval,
1044 .maxlen = sizeof(dirty_expire_interval),
1045 .mode = 0644,
1046 .proc_handler = proc_dointvec,
1047 },
1048 {
1049 .procname = "nr_pdflush_threads",
1050 .data = &nr_pdflush_threads,
1051 .maxlen = sizeof nr_pdflush_threads,
1052 .mode = 0444 /* read-only*/,
1053 .proc_handler = proc_dointvec,
1054 },
1055 {
1056 .procname = "swappiness",
1057 .data = &vm_swappiness,
1058 .maxlen = sizeof(vm_swappiness),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec_minmax,
1061 .extra1 = &zero,
1062 .extra2 = &one_hundred,
1063 },
1064 #ifdef CONFIG_HUGETLB_PAGE
1065 {
1066 .procname = "nr_hugepages",
1067 .data = NULL,
1068 .maxlen = sizeof(unsigned long),
1069 .mode = 0644,
1070 .proc_handler = hugetlb_sysctl_handler,
1071 .extra1 = (void *)&hugetlb_zero,
1072 .extra2 = (void *)&hugetlb_infinity,
1073 },
1074 #ifdef CONFIG_NUMA
1075 {
1076 .procname = "nr_hugepages_mempolicy",
1077 .data = NULL,
1078 .maxlen = sizeof(unsigned long),
1079 .mode = 0644,
1080 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1081 .extra1 = (void *)&hugetlb_zero,
1082 .extra2 = (void *)&hugetlb_infinity,
1083 },
1084 #endif
1085 {
1086 .procname = "hugetlb_shm_group",
1087 .data = &sysctl_hugetlb_shm_group,
1088 .maxlen = sizeof(gid_t),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec,
1091 },
1092 {
1093 .procname = "hugepages_treat_as_movable",
1094 .data = &hugepages_treat_as_movable,
1095 .maxlen = sizeof(int),
1096 .mode = 0644,
1097 .proc_handler = hugetlb_treat_movable_handler,
1098 },
1099 {
1100 .procname = "nr_overcommit_hugepages",
1101 .data = NULL,
1102 .maxlen = sizeof(unsigned long),
1103 .mode = 0644,
1104 .proc_handler = hugetlb_overcommit_handler,
1105 .extra1 = (void *)&hugetlb_zero,
1106 .extra2 = (void *)&hugetlb_infinity,
1107 },
1108 #endif
1109 {
1110 .procname = "lowmem_reserve_ratio",
1111 .data = &sysctl_lowmem_reserve_ratio,
1112 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1113 .mode = 0644,
1114 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1115 },
1116 {
1117 .procname = "drop_caches",
1118 .data = &sysctl_drop_caches,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = drop_caches_sysctl_handler,
1122 },
1123 {
1124 .procname = "min_free_kbytes",
1125 .data = &min_free_kbytes,
1126 .maxlen = sizeof(min_free_kbytes),
1127 .mode = 0644,
1128 .proc_handler = min_free_kbytes_sysctl_handler,
1129 .extra1 = &zero,
1130 },
1131 {
1132 .procname = "percpu_pagelist_fraction",
1133 .data = &percpu_pagelist_fraction,
1134 .maxlen = sizeof(percpu_pagelist_fraction),
1135 .mode = 0644,
1136 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1137 .extra1 = &min_percpu_pagelist_fract,
1138 },
1139 #ifdef CONFIG_MMU
1140 {
1141 .procname = "max_map_count",
1142 .data = &sysctl_max_map_count,
1143 .maxlen = sizeof(sysctl_max_map_count),
1144 .mode = 0644,
1145 .proc_handler = proc_dointvec_minmax,
1146 .extra1 = &zero,
1147 },
1148 #else
1149 {
1150 .procname = "nr_trim_pages",
1151 .data = &sysctl_nr_trim_pages,
1152 .maxlen = sizeof(sysctl_nr_trim_pages),
1153 .mode = 0644,
1154 .proc_handler = proc_dointvec_minmax,
1155 .extra1 = &zero,
1156 },
1157 #endif
1158 {
1159 .procname = "laptop_mode",
1160 .data = &laptop_mode,
1161 .maxlen = sizeof(laptop_mode),
1162 .mode = 0644,
1163 .proc_handler = proc_dointvec_jiffies,
1164 },
1165 {
1166 .procname = "block_dump",
1167 .data = &block_dump,
1168 .maxlen = sizeof(block_dump),
1169 .mode = 0644,
1170 .proc_handler = proc_dointvec,
1171 .extra1 = &zero,
1172 },
1173 {
1174 .procname = "vfs_cache_pressure",
1175 .data = &sysctl_vfs_cache_pressure,
1176 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1177 .mode = 0644,
1178 .proc_handler = proc_dointvec,
1179 .extra1 = &zero,
1180 },
1181 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1182 {
1183 .procname = "legacy_va_layout",
1184 .data = &sysctl_legacy_va_layout,
1185 .maxlen = sizeof(sysctl_legacy_va_layout),
1186 .mode = 0644,
1187 .proc_handler = proc_dointvec,
1188 .extra1 = &zero,
1189 },
1190 #endif
1191 #ifdef CONFIG_NUMA
1192 {
1193 .procname = "zone_reclaim_mode",
1194 .data = &zone_reclaim_mode,
1195 .maxlen = sizeof(zone_reclaim_mode),
1196 .mode = 0644,
1197 .proc_handler = proc_dointvec,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .procname = "min_unmapped_ratio",
1202 .data = &sysctl_min_unmapped_ratio,
1203 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1204 .mode = 0644,
1205 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1206 .extra1 = &zero,
1207 .extra2 = &one_hundred,
1208 },
1209 {
1210 .procname = "min_slab_ratio",
1211 .data = &sysctl_min_slab_ratio,
1212 .maxlen = sizeof(sysctl_min_slab_ratio),
1213 .mode = 0644,
1214 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1215 .extra1 = &zero,
1216 .extra2 = &one_hundred,
1217 },
1218 #endif
1219 #ifdef CONFIG_SMP
1220 {
1221 .procname = "stat_interval",
1222 .data = &sysctl_stat_interval,
1223 .maxlen = sizeof(sysctl_stat_interval),
1224 .mode = 0644,
1225 .proc_handler = proc_dointvec_jiffies,
1226 },
1227 #endif
1228 #ifdef CONFIG_MMU
1229 {
1230 .procname = "mmap_min_addr",
1231 .data = &dac_mmap_min_addr,
1232 .maxlen = sizeof(unsigned long),
1233 .mode = 0644,
1234 .proc_handler = mmap_min_addr_handler,
1235 },
1236 #endif
1237 #ifdef CONFIG_NUMA
1238 {
1239 .procname = "numa_zonelist_order",
1240 .data = &numa_zonelist_order,
1241 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1242 .mode = 0644,
1243 .proc_handler = numa_zonelist_order_handler,
1244 },
1245 #endif
1246 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1247 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1248 {
1249 .procname = "vdso_enabled",
1250 .data = &vdso_enabled,
1251 .maxlen = sizeof(vdso_enabled),
1252 .mode = 0644,
1253 .proc_handler = proc_dointvec,
1254 .extra1 = &zero,
1255 },
1256 #endif
1257 #ifdef CONFIG_HIGHMEM
1258 {
1259 .procname = "highmem_is_dirtyable",
1260 .data = &vm_highmem_is_dirtyable,
1261 .maxlen = sizeof(vm_highmem_is_dirtyable),
1262 .mode = 0644,
1263 .proc_handler = proc_dointvec_minmax,
1264 .extra1 = &zero,
1265 .extra2 = &one,
1266 },
1267 #endif
1268 {
1269 .procname = "scan_unevictable_pages",
1270 .data = &scan_unevictable_pages,
1271 .maxlen = sizeof(scan_unevictable_pages),
1272 .mode = 0644,
1273 .proc_handler = scan_unevictable_handler,
1274 },
1275 #ifdef CONFIG_MEMORY_FAILURE
1276 {
1277 .procname = "memory_failure_early_kill",
1278 .data = &sysctl_memory_failure_early_kill,
1279 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1280 .mode = 0644,
1281 .proc_handler = proc_dointvec_minmax,
1282 .extra1 = &zero,
1283 .extra2 = &one,
1284 },
1285 {
1286 .procname = "memory_failure_recovery",
1287 .data = &sysctl_memory_failure_recovery,
1288 .maxlen = sizeof(sysctl_memory_failure_recovery),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1292 .extra2 = &one,
1293 },
1294 #endif
1295
1296 /*
1297 * NOTE: do not add new entries to this table unless you have read
1298 * Documentation/sysctl/ctl_unnumbered.txt
1299 */
1300 { }
1301 };
1302
1303 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1304 static struct ctl_table binfmt_misc_table[] = {
1305 { }
1306 };
1307 #endif
1308
1309 static struct ctl_table fs_table[] = {
1310 {
1311 .procname = "inode-nr",
1312 .data = &inodes_stat,
1313 .maxlen = 2*sizeof(int),
1314 .mode = 0444,
1315 .proc_handler = proc_dointvec,
1316 },
1317 {
1318 .procname = "inode-state",
1319 .data = &inodes_stat,
1320 .maxlen = 7*sizeof(int),
1321 .mode = 0444,
1322 .proc_handler = proc_dointvec,
1323 },
1324 {
1325 .procname = "file-nr",
1326 .data = &files_stat,
1327 .maxlen = 3*sizeof(int),
1328 .mode = 0444,
1329 .proc_handler = proc_nr_files,
1330 },
1331 {
1332 .procname = "file-max",
1333 .data = &files_stat.max_files,
1334 .maxlen = sizeof(int),
1335 .mode = 0644,
1336 .proc_handler = proc_dointvec,
1337 },
1338 {
1339 .procname = "nr_open",
1340 .data = &sysctl_nr_open,
1341 .maxlen = sizeof(int),
1342 .mode = 0644,
1343 .proc_handler = proc_dointvec_minmax,
1344 .extra1 = &sysctl_nr_open_min,
1345 .extra2 = &sysctl_nr_open_max,
1346 },
1347 {
1348 .procname = "dentry-state",
1349 .data = &dentry_stat,
1350 .maxlen = 6*sizeof(int),
1351 .mode = 0444,
1352 .proc_handler = proc_dointvec,
1353 },
1354 {
1355 .procname = "overflowuid",
1356 .data = &fs_overflowuid,
1357 .maxlen = sizeof(int),
1358 .mode = 0644,
1359 .proc_handler = proc_dointvec_minmax,
1360 .extra1 = &minolduid,
1361 .extra2 = &maxolduid,
1362 },
1363 {
1364 .procname = "overflowgid",
1365 .data = &fs_overflowgid,
1366 .maxlen = sizeof(int),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec_minmax,
1369 .extra1 = &minolduid,
1370 .extra2 = &maxolduid,
1371 },
1372 #ifdef CONFIG_FILE_LOCKING
1373 {
1374 .procname = "leases-enable",
1375 .data = &leases_enable,
1376 .maxlen = sizeof(int),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec,
1379 },
1380 #endif
1381 #ifdef CONFIG_DNOTIFY
1382 {
1383 .procname = "dir-notify-enable",
1384 .data = &dir_notify_enable,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec,
1388 },
1389 #endif
1390 #ifdef CONFIG_MMU
1391 #ifdef CONFIG_FILE_LOCKING
1392 {
1393 .procname = "lease-break-time",
1394 .data = &lease_break_time,
1395 .maxlen = sizeof(int),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec,
1398 },
1399 #endif
1400 #ifdef CONFIG_AIO
1401 {
1402 .procname = "aio-nr",
1403 .data = &aio_nr,
1404 .maxlen = sizeof(aio_nr),
1405 .mode = 0444,
1406 .proc_handler = proc_doulongvec_minmax,
1407 },
1408 {
1409 .procname = "aio-max-nr",
1410 .data = &aio_max_nr,
1411 .maxlen = sizeof(aio_max_nr),
1412 .mode = 0644,
1413 .proc_handler = proc_doulongvec_minmax,
1414 },
1415 #endif /* CONFIG_AIO */
1416 #ifdef CONFIG_INOTIFY_USER
1417 {
1418 .procname = "inotify",
1419 .mode = 0555,
1420 .child = inotify_table,
1421 },
1422 #endif
1423 #ifdef CONFIG_EPOLL
1424 {
1425 .procname = "epoll",
1426 .mode = 0555,
1427 .child = epoll_table,
1428 },
1429 #endif
1430 #endif
1431 {
1432 .procname = "suid_dumpable",
1433 .data = &suid_dumpable,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
1436 .proc_handler = proc_dointvec_minmax,
1437 .extra1 = &zero,
1438 .extra2 = &two,
1439 },
1440 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1441 {
1442 .procname = "binfmt_misc",
1443 .mode = 0555,
1444 .child = binfmt_misc_table,
1445 },
1446 #endif
1447 /*
1448 * NOTE: do not add new entries to this table unless you have read
1449 * Documentation/sysctl/ctl_unnumbered.txt
1450 */
1451 { }
1452 };
1453
1454 static struct ctl_table debug_table[] = {
1455 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1456 defined(CONFIG_S390)
1457 {
1458 .procname = "exception-trace",
1459 .data = &show_unhandled_signals,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec
1463 },
1464 #endif
1465 #if defined(CONFIG_OPTPROBES)
1466 {
1467 .procname = "kprobes-optimization",
1468 .data = &sysctl_kprobes_optimization,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = proc_kprobes_optimization_handler,
1472 .extra1 = &zero,
1473 .extra2 = &one,
1474 },
1475 #endif
1476 { }
1477 };
1478
1479 static struct ctl_table dev_table[] = {
1480 { }
1481 };
1482
1483 static DEFINE_SPINLOCK(sysctl_lock);
1484
1485 /* called under sysctl_lock */
1486 static int use_table(struct ctl_table_header *p)
1487 {
1488 if (unlikely(p->unregistering))
1489 return 0;
1490 p->used++;
1491 return 1;
1492 }
1493
1494 /* called under sysctl_lock */
1495 static void unuse_table(struct ctl_table_header *p)
1496 {
1497 if (!--p->used)
1498 if (unlikely(p->unregistering))
1499 complete(p->unregistering);
1500 }
1501
1502 /* called under sysctl_lock, will reacquire if has to wait */
1503 static void start_unregistering(struct ctl_table_header *p)
1504 {
1505 /*
1506 * if p->used is 0, nobody will ever touch that entry again;
1507 * we'll eliminate all paths to it before dropping sysctl_lock
1508 */
1509 if (unlikely(p->used)) {
1510 struct completion wait;
1511 init_completion(&wait);
1512 p->unregistering = &wait;
1513 spin_unlock(&sysctl_lock);
1514 wait_for_completion(&wait);
1515 spin_lock(&sysctl_lock);
1516 } else {
1517 /* anything non-NULL; we'll never dereference it */
1518 p->unregistering = ERR_PTR(-EINVAL);
1519 }
1520 /*
1521 * do not remove from the list until nobody holds it; walking the
1522 * list in do_sysctl() relies on that.
1523 */
1524 list_del_init(&p->ctl_entry);
1525 }
1526
1527 void sysctl_head_get(struct ctl_table_header *head)
1528 {
1529 spin_lock(&sysctl_lock);
1530 head->count++;
1531 spin_unlock(&sysctl_lock);
1532 }
1533
1534 void sysctl_head_put(struct ctl_table_header *head)
1535 {
1536 spin_lock(&sysctl_lock);
1537 if (!--head->count)
1538 kfree(head);
1539 spin_unlock(&sysctl_lock);
1540 }
1541
1542 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1543 {
1544 if (!head)
1545 BUG();
1546 spin_lock(&sysctl_lock);
1547 if (!use_table(head))
1548 head = ERR_PTR(-ENOENT);
1549 spin_unlock(&sysctl_lock);
1550 return head;
1551 }
1552
1553 void sysctl_head_finish(struct ctl_table_header *head)
1554 {
1555 if (!head)
1556 return;
1557 spin_lock(&sysctl_lock);
1558 unuse_table(head);
1559 spin_unlock(&sysctl_lock);
1560 }
1561
1562 static struct ctl_table_set *
1563 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1564 {
1565 struct ctl_table_set *set = &root->default_set;
1566 if (root->lookup)
1567 set = root->lookup(root, namespaces);
1568 return set;
1569 }
1570
1571 static struct list_head *
1572 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1573 {
1574 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1575 return &set->list;
1576 }
1577
1578 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1579 struct ctl_table_header *prev)
1580 {
1581 struct ctl_table_root *root;
1582 struct list_head *header_list;
1583 struct ctl_table_header *head;
1584 struct list_head *tmp;
1585
1586 spin_lock(&sysctl_lock);
1587 if (prev) {
1588 head = prev;
1589 tmp = &prev->ctl_entry;
1590 unuse_table(prev);
1591 goto next;
1592 }
1593 tmp = &root_table_header.ctl_entry;
1594 for (;;) {
1595 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1596
1597 if (!use_table(head))
1598 goto next;
1599 spin_unlock(&sysctl_lock);
1600 return head;
1601 next:
1602 root = head->root;
1603 tmp = tmp->next;
1604 header_list = lookup_header_list(root, namespaces);
1605 if (tmp != header_list)
1606 continue;
1607
1608 do {
1609 root = list_entry(root->root_list.next,
1610 struct ctl_table_root, root_list);
1611 if (root == &sysctl_table_root)
1612 goto out;
1613 header_list = lookup_header_list(root, namespaces);
1614 } while (list_empty(header_list));
1615 tmp = header_list->next;
1616 }
1617 out:
1618 spin_unlock(&sysctl_lock);
1619 return NULL;
1620 }
1621
1622 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1623 {
1624 return __sysctl_head_next(current->nsproxy, prev);
1625 }
1626
1627 void register_sysctl_root(struct ctl_table_root *root)
1628 {
1629 spin_lock(&sysctl_lock);
1630 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1631 spin_unlock(&sysctl_lock);
1632 }
1633
1634 /*
1635 * sysctl_perm does NOT grant the superuser all rights automatically, because
1636 * some sysctl variables are readonly even to root.
1637 */
1638
1639 static int test_perm(int mode, int op)
1640 {
1641 if (!current_euid())
1642 mode >>= 6;
1643 else if (in_egroup_p(0))
1644 mode >>= 3;
1645 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1646 return 0;
1647 return -EACCES;
1648 }
1649
1650 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1651 {
1652 int error;
1653 int mode;
1654
1655 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1656 if (error)
1657 return error;
1658
1659 if (root->permissions)
1660 mode = root->permissions(root, current->nsproxy, table);
1661 else
1662 mode = table->mode;
1663
1664 return test_perm(mode, op);
1665 }
1666
1667 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1668 {
1669 for (; table->procname; table++) {
1670 table->parent = parent;
1671 if (table->child)
1672 sysctl_set_parent(table, table->child);
1673 }
1674 }
1675
1676 static __init int sysctl_init(void)
1677 {
1678 sysctl_set_parent(NULL, root_table);
1679 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1680 {
1681 int err;
1682 err = sysctl_check_table(current->nsproxy, root_table);
1683 }
1684 #endif
1685 return 0;
1686 }
1687
1688 core_initcall(sysctl_init);
1689
1690 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1691 struct ctl_table *table)
1692 {
1693 struct ctl_table *p;
1694 const char *s = branch->procname;
1695
1696 /* branch should have named subdirectory as its first element */
1697 if (!s || !branch->child)
1698 return NULL;
1699
1700 /* ... and nothing else */
1701 if (branch[1].procname)
1702 return NULL;
1703
1704 /* table should contain subdirectory with the same name */
1705 for (p = table; p->procname; p++) {
1706 if (!p->child)
1707 continue;
1708 if (p->procname && strcmp(p->procname, s) == 0)
1709 return p;
1710 }
1711 return NULL;
1712 }
1713
1714 /* see if attaching q to p would be an improvement */
1715 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1716 {
1717 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1718 struct ctl_table *next;
1719 int is_better = 0;
1720 int not_in_parent = !p->attached_by;
1721
1722 while ((next = is_branch_in(by, to)) != NULL) {
1723 if (by == q->attached_by)
1724 is_better = 1;
1725 if (to == p->attached_by)
1726 not_in_parent = 1;
1727 by = by->child;
1728 to = next->child;
1729 }
1730
1731 if (is_better && not_in_parent) {
1732 q->attached_by = by;
1733 q->attached_to = to;
1734 q->parent = p;
1735 }
1736 }
1737
1738 /**
1739 * __register_sysctl_paths - register a sysctl hierarchy
1740 * @root: List of sysctl headers to register on
1741 * @namespaces: Data to compute which lists of sysctl entries are visible
1742 * @path: The path to the directory the sysctl table is in.
1743 * @table: the top-level table structure
1744 *
1745 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1746 * array. A completely 0 filled entry terminates the table.
1747 *
1748 * The members of the &struct ctl_table structure are used as follows:
1749 *
1750 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1751 * enter a sysctl file
1752 *
1753 * data - a pointer to data for use by proc_handler
1754 *
1755 * maxlen - the maximum size in bytes of the data
1756 *
1757 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1758 *
1759 * child - a pointer to the child sysctl table if this entry is a directory, or
1760 * %NULL.
1761 *
1762 * proc_handler - the text handler routine (described below)
1763 *
1764 * de - for internal use by the sysctl routines
1765 *
1766 * extra1, extra2 - extra pointers usable by the proc handler routines
1767 *
1768 * Leaf nodes in the sysctl tree will be represented by a single file
1769 * under /proc; non-leaf nodes will be represented by directories.
1770 *
1771 * sysctl(2) can automatically manage read and write requests through
1772 * the sysctl table. The data and maxlen fields of the ctl_table
1773 * struct enable minimal validation of the values being written to be
1774 * performed, and the mode field allows minimal authentication.
1775 *
1776 * There must be a proc_handler routine for any terminal nodes
1777 * mirrored under /proc/sys (non-terminals are handled by a built-in
1778 * directory handler). Several default handlers are available to
1779 * cover common cases -
1780 *
1781 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1782 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1783 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1784 *
1785 * It is the handler's job to read the input buffer from user memory
1786 * and process it. The handler should return 0 on success.
1787 *
1788 * This routine returns %NULL on a failure to register, and a pointer
1789 * to the table header on success.
1790 */
1791 struct ctl_table_header *__register_sysctl_paths(
1792 struct ctl_table_root *root,
1793 struct nsproxy *namespaces,
1794 const struct ctl_path *path, struct ctl_table *table)
1795 {
1796 struct ctl_table_header *header;
1797 struct ctl_table *new, **prevp;
1798 unsigned int n, npath;
1799 struct ctl_table_set *set;
1800
1801 /* Count the path components */
1802 for (npath = 0; path[npath].procname; ++npath)
1803 ;
1804
1805 /*
1806 * For each path component, allocate a 2-element ctl_table array.
1807 * The first array element will be filled with the sysctl entry
1808 * for this, the second will be the sentinel (procname == 0).
1809 *
1810 * We allocate everything in one go so that we don't have to
1811 * worry about freeing additional memory in unregister_sysctl_table.
1812 */
1813 header = kzalloc(sizeof(struct ctl_table_header) +
1814 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1815 if (!header)
1816 return NULL;
1817
1818 new = (struct ctl_table *) (header + 1);
1819
1820 /* Now connect the dots */
1821 prevp = &header->ctl_table;
1822 for (n = 0; n < npath; ++n, ++path) {
1823 /* Copy the procname */
1824 new->procname = path->procname;
1825 new->mode = 0555;
1826
1827 *prevp = new;
1828 prevp = &new->child;
1829
1830 new += 2;
1831 }
1832 *prevp = table;
1833 header->ctl_table_arg = table;
1834
1835 INIT_LIST_HEAD(&header->ctl_entry);
1836 header->used = 0;
1837 header->unregistering = NULL;
1838 header->root = root;
1839 sysctl_set_parent(NULL, header->ctl_table);
1840 header->count = 1;
1841 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1842 if (sysctl_check_table(namespaces, header->ctl_table)) {
1843 kfree(header);
1844 return NULL;
1845 }
1846 #endif
1847 spin_lock(&sysctl_lock);
1848 header->set = lookup_header_set(root, namespaces);
1849 header->attached_by = header->ctl_table;
1850 header->attached_to = root_table;
1851 header->parent = &root_table_header;
1852 for (set = header->set; set; set = set->parent) {
1853 struct ctl_table_header *p;
1854 list_for_each_entry(p, &set->list, ctl_entry) {
1855 if (p->unregistering)
1856 continue;
1857 try_attach(p, header);
1858 }
1859 }
1860 header->parent->count++;
1861 list_add_tail(&header->ctl_entry, &header->set->list);
1862 spin_unlock(&sysctl_lock);
1863
1864 return header;
1865 }
1866
1867 /**
1868 * register_sysctl_table_path - register a sysctl table hierarchy
1869 * @path: The path to the directory the sysctl table is in.
1870 * @table: the top-level table structure
1871 *
1872 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1873 * array. A completely 0 filled entry terminates the table.
1874 *
1875 * See __register_sysctl_paths for more details.
1876 */
1877 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1878 struct ctl_table *table)
1879 {
1880 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1881 path, table);
1882 }
1883
1884 /**
1885 * register_sysctl_table - register a sysctl table hierarchy
1886 * @table: the top-level table structure
1887 *
1888 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1889 * array. A completely 0 filled entry terminates the table.
1890 *
1891 * See register_sysctl_paths for more details.
1892 */
1893 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1894 {
1895 static const struct ctl_path null_path[] = { {} };
1896
1897 return register_sysctl_paths(null_path, table);
1898 }
1899
1900 /**
1901 * unregister_sysctl_table - unregister a sysctl table hierarchy
1902 * @header: the header returned from register_sysctl_table
1903 *
1904 * Unregisters the sysctl table and all children. proc entries may not
1905 * actually be removed until they are no longer used by anyone.
1906 */
1907 void unregister_sysctl_table(struct ctl_table_header * header)
1908 {
1909 might_sleep();
1910
1911 if (header == NULL)
1912 return;
1913
1914 spin_lock(&sysctl_lock);
1915 start_unregistering(header);
1916 if (!--header->parent->count) {
1917 WARN_ON(1);
1918 kfree(header->parent);
1919 }
1920 if (!--header->count)
1921 kfree(header);
1922 spin_unlock(&sysctl_lock);
1923 }
1924
1925 int sysctl_is_seen(struct ctl_table_header *p)
1926 {
1927 struct ctl_table_set *set = p->set;
1928 int res;
1929 spin_lock(&sysctl_lock);
1930 if (p->unregistering)
1931 res = 0;
1932 else if (!set->is_seen)
1933 res = 1;
1934 else
1935 res = set->is_seen(set);
1936 spin_unlock(&sysctl_lock);
1937 return res;
1938 }
1939
1940 void setup_sysctl_set(struct ctl_table_set *p,
1941 struct ctl_table_set *parent,
1942 int (*is_seen)(struct ctl_table_set *))
1943 {
1944 INIT_LIST_HEAD(&p->list);
1945 p->parent = parent ? parent : &sysctl_table_root.default_set;
1946 p->is_seen = is_seen;
1947 }
1948
1949 #else /* !CONFIG_SYSCTL */
1950 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1951 {
1952 return NULL;
1953 }
1954
1955 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1956 struct ctl_table *table)
1957 {
1958 return NULL;
1959 }
1960
1961 void unregister_sysctl_table(struct ctl_table_header * table)
1962 {
1963 }
1964
1965 void setup_sysctl_set(struct ctl_table_set *p,
1966 struct ctl_table_set *parent,
1967 int (*is_seen)(struct ctl_table_set *))
1968 {
1969 }
1970
1971 void sysctl_head_put(struct ctl_table_header *head)
1972 {
1973 }
1974
1975 #endif /* CONFIG_SYSCTL */
1976
1977 /*
1978 * /proc/sys support
1979 */
1980
1981 #ifdef CONFIG_PROC_SYSCTL
1982
1983 static int _proc_do_string(void* data, int maxlen, int write,
1984 void __user *buffer,
1985 size_t *lenp, loff_t *ppos)
1986 {
1987 size_t len;
1988 char __user *p;
1989 char c;
1990
1991 if (!data || !maxlen || !*lenp) {
1992 *lenp = 0;
1993 return 0;
1994 }
1995
1996 if (write) {
1997 len = 0;
1998 p = buffer;
1999 while (len < *lenp) {
2000 if (get_user(c, p++))
2001 return -EFAULT;
2002 if (c == 0 || c == '\n')
2003 break;
2004 len++;
2005 }
2006 if (len >= maxlen)
2007 len = maxlen-1;
2008 if(copy_from_user(data, buffer, len))
2009 return -EFAULT;
2010 ((char *) data)[len] = 0;
2011 *ppos += *lenp;
2012 } else {
2013 len = strlen(data);
2014 if (len > maxlen)
2015 len = maxlen;
2016
2017 if (*ppos > len) {
2018 *lenp = 0;
2019 return 0;
2020 }
2021
2022 data += *ppos;
2023 len -= *ppos;
2024
2025 if (len > *lenp)
2026 len = *lenp;
2027 if (len)
2028 if(copy_to_user(buffer, data, len))
2029 return -EFAULT;
2030 if (len < *lenp) {
2031 if(put_user('\n', ((char __user *) buffer) + len))
2032 return -EFAULT;
2033 len++;
2034 }
2035 *lenp = len;
2036 *ppos += len;
2037 }
2038 return 0;
2039 }
2040
2041 /**
2042 * proc_dostring - read a string sysctl
2043 * @table: the sysctl table
2044 * @write: %TRUE if this is a write to the sysctl file
2045 * @buffer: the user buffer
2046 * @lenp: the size of the user buffer
2047 * @ppos: file position
2048 *
2049 * Reads/writes a string from/to the user buffer. If the kernel
2050 * buffer provided is not large enough to hold the string, the
2051 * string is truncated. The copied string is %NULL-terminated.
2052 * If the string is being read by the user process, it is copied
2053 * and a newline '\n' is added. It is truncated if the buffer is
2054 * not large enough.
2055 *
2056 * Returns 0 on success.
2057 */
2058 int proc_dostring(struct ctl_table *table, int write,
2059 void __user *buffer, size_t *lenp, loff_t *ppos)
2060 {
2061 return _proc_do_string(table->data, table->maxlen, write,
2062 buffer, lenp, ppos);
2063 }
2064
2065 static size_t proc_skip_spaces(char **buf)
2066 {
2067 size_t ret;
2068 char *tmp = skip_spaces(*buf);
2069 ret = tmp - *buf;
2070 *buf = tmp;
2071 return ret;
2072 }
2073
2074 static void proc_skip_char(char **buf, size_t *size, const char v)
2075 {
2076 while (*size) {
2077 if (**buf != v)
2078 break;
2079 (*size)--;
2080 (*buf)++;
2081 }
2082 }
2083
2084 #define TMPBUFLEN 22
2085 /**
2086 * proc_get_long - reads an ASCII formated integer from a user buffer
2087 *
2088 * @buf - a kernel buffer
2089 * @size - size of the kernel buffer
2090 * @val - this is where the number will be stored
2091 * @neg - set to %TRUE if number is negative
2092 * @perm_tr - a vector which contains the allowed trailers
2093 * @perm_tr_len - size of the perm_tr vector
2094 * @tr - pointer to store the trailer character
2095 *
2096 * In case of success 0 is returned and buf and size are updated with
2097 * the amount of bytes read. If tr is non NULL and a trailing
2098 * character exist (size is non zero after returning from this
2099 * function) tr is updated with the trailing character.
2100 */
2101 static int proc_get_long(char **buf, size_t *size,
2102 unsigned long *val, bool *neg,
2103 const char *perm_tr, unsigned perm_tr_len, char *tr)
2104 {
2105 int len;
2106 char *p, tmp[TMPBUFLEN];
2107
2108 if (!*size)
2109 return -EINVAL;
2110
2111 len = *size;
2112 if (len > TMPBUFLEN - 1)
2113 len = TMPBUFLEN - 1;
2114
2115 memcpy(tmp, *buf, len);
2116
2117 tmp[len] = 0;
2118 p = tmp;
2119 if (*p == '-' && *size > 1) {
2120 *neg = true;
2121 p++;
2122 } else
2123 *neg = false;
2124 if (!isdigit(*p))
2125 return -EINVAL;
2126
2127 *val = simple_strtoul(p, &p, 0);
2128
2129 len = p - tmp;
2130
2131 /* We don't know if the next char is whitespace thus we may accept
2132 * invalid integers (e.g. 1234...a) or two integers instead of one
2133 * (e.g. 123...1). So lets not allow such large numbers. */
2134 if (len == TMPBUFLEN - 1)
2135 return -EINVAL;
2136
2137 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2138 return -EINVAL;
2139
2140 if (tr && (len < *size))
2141 *tr = *p;
2142
2143 *buf += len;
2144 *size -= len;
2145
2146 return 0;
2147 }
2148
2149 /**
2150 * proc_put_long - coverts an integer to a decimal ASCII formated string
2151 *
2152 * @buf - the user buffer
2153 * @size - the size of the user buffer
2154 * @val - the integer to be converted
2155 * @neg - sign of the number, %TRUE for negative
2156 *
2157 * In case of success 0 is returned and buf and size are updated with
2158 * the amount of bytes read.
2159 */
2160 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2161 bool neg)
2162 {
2163 int len;
2164 char tmp[TMPBUFLEN], *p = tmp;
2165
2166 sprintf(p, "%s%lu", neg ? "-" : "", val);
2167 len = strlen(tmp);
2168 if (len > *size)
2169 len = *size;
2170 if (copy_to_user(*buf, tmp, len))
2171 return -EFAULT;
2172 *size -= len;
2173 *buf += len;
2174 return 0;
2175 }
2176 #undef TMPBUFLEN
2177
2178 static int proc_put_char(void __user **buf, size_t *size, char c)
2179 {
2180 if (*size) {
2181 char __user **buffer = (char __user **)buf;
2182 if (put_user(c, *buffer))
2183 return -EFAULT;
2184 (*size)--, (*buffer)++;
2185 *buf = *buffer;
2186 }
2187 return 0;
2188 }
2189
2190 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2191 int *valp,
2192 int write, void *data)
2193 {
2194 if (write) {
2195 *valp = *negp ? -*lvalp : *lvalp;
2196 } else {
2197 int val = *valp;
2198 if (val < 0) {
2199 *negp = true;
2200 *lvalp = (unsigned long)-val;
2201 } else {
2202 *negp = false;
2203 *lvalp = (unsigned long)val;
2204 }
2205 }
2206 return 0;
2207 }
2208
2209 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2210
2211 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2212 int write, void __user *buffer,
2213 size_t *lenp, loff_t *ppos,
2214 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2215 int write, void *data),
2216 void *data)
2217 {
2218 int *i, vleft, first = 1, err = 0;
2219 unsigned long page = 0;
2220 size_t left;
2221 char *kbuf;
2222
2223 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2224 *lenp = 0;
2225 return 0;
2226 }
2227
2228 i = (int *) tbl_data;
2229 vleft = table->maxlen / sizeof(*i);
2230 left = *lenp;
2231
2232 if (!conv)
2233 conv = do_proc_dointvec_conv;
2234
2235 if (write) {
2236 if (left > PAGE_SIZE - 1)
2237 left = PAGE_SIZE - 1;
2238 page = __get_free_page(GFP_TEMPORARY);
2239 kbuf = (char *) page;
2240 if (!kbuf)
2241 return -ENOMEM;
2242 if (copy_from_user(kbuf, buffer, left)) {
2243 err = -EFAULT;
2244 goto free;
2245 }
2246 kbuf[left] = 0;
2247 }
2248
2249 for (; left && vleft--; i++, first=0) {
2250 unsigned long lval;
2251 bool neg;
2252
2253 if (write) {
2254 left -= proc_skip_spaces(&kbuf);
2255
2256 err = proc_get_long(&kbuf, &left, &lval, &neg,
2257 proc_wspace_sep,
2258 sizeof(proc_wspace_sep), NULL);
2259 if (err)
2260 break;
2261 if (conv(&neg, &lval, i, 1, data)) {
2262 err = -EINVAL;
2263 break;
2264 }
2265 } else {
2266 if (conv(&neg, &lval, i, 0, data)) {
2267 err = -EINVAL;
2268 break;
2269 }
2270 if (!first)
2271 err = proc_put_char(&buffer, &left, '\t');
2272 if (err)
2273 break;
2274 err = proc_put_long(&buffer, &left, lval, neg);
2275 if (err)
2276 break;
2277 }
2278 }
2279
2280 if (!write && !first && left && !err)
2281 err = proc_put_char(&buffer, &left, '\n');
2282 if (write && !err)
2283 left -= proc_skip_spaces(&kbuf);
2284 free:
2285 if (write) {
2286 free_page(page);
2287 if (first)
2288 return err ? : -EINVAL;
2289 }
2290 *lenp -= left;
2291 *ppos += *lenp;
2292 return err;
2293 }
2294
2295 static int do_proc_dointvec(struct ctl_table *table, int write,
2296 void __user *buffer, size_t *lenp, loff_t *ppos,
2297 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2298 int write, void *data),
2299 void *data)
2300 {
2301 return __do_proc_dointvec(table->data, table, write,
2302 buffer, lenp, ppos, conv, data);
2303 }
2304
2305 /**
2306 * proc_dointvec - read a vector of integers
2307 * @table: the sysctl table
2308 * @write: %TRUE if this is a write to the sysctl file
2309 * @buffer: the user buffer
2310 * @lenp: the size of the user buffer
2311 * @ppos: file position
2312 *
2313 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2314 * values from/to the user buffer, treated as an ASCII string.
2315 *
2316 * Returns 0 on success.
2317 */
2318 int proc_dointvec(struct ctl_table *table, int write,
2319 void __user *buffer, size_t *lenp, loff_t *ppos)
2320 {
2321 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2322 NULL,NULL);
2323 }
2324
2325 /*
2326 * Taint values can only be increased
2327 * This means we can safely use a temporary.
2328 */
2329 static int proc_taint(struct ctl_table *table, int write,
2330 void __user *buffer, size_t *lenp, loff_t *ppos)
2331 {
2332 struct ctl_table t;
2333 unsigned long tmptaint = get_taint();
2334 int err;
2335
2336 if (write && !capable(CAP_SYS_ADMIN))
2337 return -EPERM;
2338
2339 t = *table;
2340 t.data = &tmptaint;
2341 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2342 if (err < 0)
2343 return err;
2344
2345 if (write) {
2346 /*
2347 * Poor man's atomic or. Not worth adding a primitive
2348 * to everyone's atomic.h for this
2349 */
2350 int i;
2351 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2352 if ((tmptaint >> i) & 1)
2353 add_taint(i);
2354 }
2355 }
2356
2357 return err;
2358 }
2359
2360 struct do_proc_dointvec_minmax_conv_param {
2361 int *min;
2362 int *max;
2363 };
2364
2365 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2366 int *valp,
2367 int write, void *data)
2368 {
2369 struct do_proc_dointvec_minmax_conv_param *param = data;
2370 if (write) {
2371 int val = *negp ? -*lvalp : *lvalp;
2372 if ((param->min && *param->min > val) ||
2373 (param->max && *param->max < val))
2374 return -EINVAL;
2375 *valp = val;
2376 } else {
2377 int val = *valp;
2378 if (val < 0) {
2379 *negp = true;
2380 *lvalp = (unsigned long)-val;
2381 } else {
2382 *negp = false;
2383 *lvalp = (unsigned long)val;
2384 }
2385 }
2386 return 0;
2387 }
2388
2389 /**
2390 * proc_dointvec_minmax - read a vector of integers with min/max values
2391 * @table: the sysctl table
2392 * @write: %TRUE if this is a write to the sysctl file
2393 * @buffer: the user buffer
2394 * @lenp: the size of the user buffer
2395 * @ppos: file position
2396 *
2397 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2398 * values from/to the user buffer, treated as an ASCII string.
2399 *
2400 * This routine will ensure the values are within the range specified by
2401 * table->extra1 (min) and table->extra2 (max).
2402 *
2403 * Returns 0 on success.
2404 */
2405 int proc_dointvec_minmax(struct ctl_table *table, int write,
2406 void __user *buffer, size_t *lenp, loff_t *ppos)
2407 {
2408 struct do_proc_dointvec_minmax_conv_param param = {
2409 .min = (int *) table->extra1,
2410 .max = (int *) table->extra2,
2411 };
2412 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2413 do_proc_dointvec_minmax_conv, &param);
2414 }
2415
2416 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2417 void __user *buffer,
2418 size_t *lenp, loff_t *ppos,
2419 unsigned long convmul,
2420 unsigned long convdiv)
2421 {
2422 unsigned long *i, *min, *max;
2423 int vleft, first = 1, err = 0;
2424 unsigned long page = 0;
2425 size_t left;
2426 char *kbuf;
2427
2428 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2429 *lenp = 0;
2430 return 0;
2431 }
2432
2433 i = (unsigned long *) data;
2434 min = (unsigned long *) table->extra1;
2435 max = (unsigned long *) table->extra2;
2436 vleft = table->maxlen / sizeof(unsigned long);
2437 left = *lenp;
2438
2439 if (write) {
2440 if (left > PAGE_SIZE - 1)
2441 left = PAGE_SIZE - 1;
2442 page = __get_free_page(GFP_TEMPORARY);
2443 kbuf = (char *) page;
2444 if (!kbuf)
2445 return -ENOMEM;
2446 if (copy_from_user(kbuf, buffer, left)) {
2447 err = -EFAULT;
2448 goto free;
2449 }
2450 kbuf[left] = 0;
2451 }
2452
2453 for (; left && vleft--; i++, min++, max++, first=0) {
2454 unsigned long val;
2455
2456 if (write) {
2457 bool neg;
2458
2459 left -= proc_skip_spaces(&kbuf);
2460
2461 err = proc_get_long(&kbuf, &left, &val, &neg,
2462 proc_wspace_sep,
2463 sizeof(proc_wspace_sep), NULL);
2464 if (err)
2465 break;
2466 if (neg)
2467 continue;
2468 if ((min && val < *min) || (max && val > *max))
2469 continue;
2470 *i = val;
2471 } else {
2472 val = convdiv * (*i) / convmul;
2473 if (!first)
2474 err = proc_put_char(&buffer, &left, '\t');
2475 err = proc_put_long(&buffer, &left, val, false);
2476 if (err)
2477 break;
2478 }
2479 }
2480
2481 if (!write && !first && left && !err)
2482 err = proc_put_char(&buffer, &left, '\n');
2483 if (write && !err)
2484 left -= proc_skip_spaces(&kbuf);
2485 free:
2486 if (write) {
2487 free_page(page);
2488 if (first)
2489 return err ? : -EINVAL;
2490 }
2491 *lenp -= left;
2492 *ppos += *lenp;
2493 return err;
2494 }
2495
2496 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2497 void __user *buffer,
2498 size_t *lenp, loff_t *ppos,
2499 unsigned long convmul,
2500 unsigned long convdiv)
2501 {
2502 return __do_proc_doulongvec_minmax(table->data, table, write,
2503 buffer, lenp, ppos, convmul, convdiv);
2504 }
2505
2506 /**
2507 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2508 * @table: the sysctl table
2509 * @write: %TRUE if this is a write to the sysctl file
2510 * @buffer: the user buffer
2511 * @lenp: the size of the user buffer
2512 * @ppos: file position
2513 *
2514 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2515 * values from/to the user buffer, treated as an ASCII string.
2516 *
2517 * This routine will ensure the values are within the range specified by
2518 * table->extra1 (min) and table->extra2 (max).
2519 *
2520 * Returns 0 on success.
2521 */
2522 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2523 void __user *buffer, size_t *lenp, loff_t *ppos)
2524 {
2525 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2526 }
2527
2528 /**
2529 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2530 * @table: the sysctl table
2531 * @write: %TRUE if this is a write to the sysctl file
2532 * @buffer: the user buffer
2533 * @lenp: the size of the user buffer
2534 * @ppos: file position
2535 *
2536 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2537 * values from/to the user buffer, treated as an ASCII string. The values
2538 * are treated as milliseconds, and converted to jiffies when they are stored.
2539 *
2540 * This routine will ensure the values are within the range specified by
2541 * table->extra1 (min) and table->extra2 (max).
2542 *
2543 * Returns 0 on success.
2544 */
2545 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2546 void __user *buffer,
2547 size_t *lenp, loff_t *ppos)
2548 {
2549 return do_proc_doulongvec_minmax(table, write, buffer,
2550 lenp, ppos, HZ, 1000l);
2551 }
2552
2553
2554 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2555 int *valp,
2556 int write, void *data)
2557 {
2558 if (write) {
2559 if (*lvalp > LONG_MAX / HZ)
2560 return 1;
2561 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2562 } else {
2563 int val = *valp;
2564 unsigned long lval;
2565 if (val < 0) {
2566 *negp = true;
2567 lval = (unsigned long)-val;
2568 } else {
2569 *negp = false;
2570 lval = (unsigned long)val;
2571 }
2572 *lvalp = lval / HZ;
2573 }
2574 return 0;
2575 }
2576
2577 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2578 int *valp,
2579 int write, void *data)
2580 {
2581 if (write) {
2582 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2583 return 1;
2584 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2585 } else {
2586 int val = *valp;
2587 unsigned long lval;
2588 if (val < 0) {
2589 *negp = true;
2590 lval = (unsigned long)-val;
2591 } else {
2592 *negp = false;
2593 lval = (unsigned long)val;
2594 }
2595 *lvalp = jiffies_to_clock_t(lval);
2596 }
2597 return 0;
2598 }
2599
2600 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2601 int *valp,
2602 int write, void *data)
2603 {
2604 if (write) {
2605 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2606 } else {
2607 int val = *valp;
2608 unsigned long lval;
2609 if (val < 0) {
2610 *negp = true;
2611 lval = (unsigned long)-val;
2612 } else {
2613 *negp = false;
2614 lval = (unsigned long)val;
2615 }
2616 *lvalp = jiffies_to_msecs(lval);
2617 }
2618 return 0;
2619 }
2620
2621 /**
2622 * proc_dointvec_jiffies - read a vector of integers as seconds
2623 * @table: the sysctl table
2624 * @write: %TRUE if this is a write to the sysctl file
2625 * @buffer: the user buffer
2626 * @lenp: the size of the user buffer
2627 * @ppos: file position
2628 *
2629 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2630 * values from/to the user buffer, treated as an ASCII string.
2631 * The values read are assumed to be in seconds, and are converted into
2632 * jiffies.
2633 *
2634 * Returns 0 on success.
2635 */
2636 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638 {
2639 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2640 do_proc_dointvec_jiffies_conv,NULL);
2641 }
2642
2643 /**
2644 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2645 * @table: the sysctl table
2646 * @write: %TRUE if this is a write to the sysctl file
2647 * @buffer: the user buffer
2648 * @lenp: the size of the user buffer
2649 * @ppos: pointer to the file position
2650 *
2651 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2652 * values from/to the user buffer, treated as an ASCII string.
2653 * The values read are assumed to be in 1/USER_HZ seconds, and
2654 * are converted into jiffies.
2655 *
2656 * Returns 0 on success.
2657 */
2658 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2662 do_proc_dointvec_userhz_jiffies_conv,NULL);
2663 }
2664
2665 /**
2666 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2667 * @table: the sysctl table
2668 * @write: %TRUE if this is a write to the sysctl file
2669 * @buffer: the user buffer
2670 * @lenp: the size of the user buffer
2671 * @ppos: file position
2672 * @ppos: the current position in the file
2673 *
2674 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2675 * values from/to the user buffer, treated as an ASCII string.
2676 * The values read are assumed to be in 1/1000 seconds, and
2677 * are converted into jiffies.
2678 *
2679 * Returns 0 on success.
2680 */
2681 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2682 void __user *buffer, size_t *lenp, loff_t *ppos)
2683 {
2684 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2685 do_proc_dointvec_ms_jiffies_conv, NULL);
2686 }
2687
2688 static int proc_do_cad_pid(struct ctl_table *table, int write,
2689 void __user *buffer, size_t *lenp, loff_t *ppos)
2690 {
2691 struct pid *new_pid;
2692 pid_t tmp;
2693 int r;
2694
2695 tmp = pid_vnr(cad_pid);
2696
2697 r = __do_proc_dointvec(&tmp, table, write, buffer,
2698 lenp, ppos, NULL, NULL);
2699 if (r || !write)
2700 return r;
2701
2702 new_pid = find_get_pid(tmp);
2703 if (!new_pid)
2704 return -ESRCH;
2705
2706 put_pid(xchg(&cad_pid, new_pid));
2707 return 0;
2708 }
2709
2710 /**
2711 * proc_do_large_bitmap - read/write from/to a large bitmap
2712 * @table: the sysctl table
2713 * @write: %TRUE if this is a write to the sysctl file
2714 * @buffer: the user buffer
2715 * @lenp: the size of the user buffer
2716 * @ppos: file position
2717 *
2718 * The bitmap is stored at table->data and the bitmap length (in bits)
2719 * in table->maxlen.
2720 *
2721 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2722 * large bitmaps may be represented in a compact manner. Writing into
2723 * the file will clear the bitmap then update it with the given input.
2724 *
2725 * Returns 0 on success.
2726 */
2727 int proc_do_large_bitmap(struct ctl_table *table, int write,
2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2729 {
2730 int err = 0;
2731 bool first = 1;
2732 size_t left = *lenp;
2733 unsigned long bitmap_len = table->maxlen;
2734 unsigned long *bitmap = (unsigned long *) table->data;
2735 unsigned long *tmp_bitmap = NULL;
2736 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2737
2738 if (!bitmap_len || !left || (*ppos && !write)) {
2739 *lenp = 0;
2740 return 0;
2741 }
2742
2743 if (write) {
2744 unsigned long page = 0;
2745 char *kbuf;
2746
2747 if (left > PAGE_SIZE - 1)
2748 left = PAGE_SIZE - 1;
2749
2750 page = __get_free_page(GFP_TEMPORARY);
2751 kbuf = (char *) page;
2752 if (!kbuf)
2753 return -ENOMEM;
2754 if (copy_from_user(kbuf, buffer, left)) {
2755 free_page(page);
2756 return -EFAULT;
2757 }
2758 kbuf[left] = 0;
2759
2760 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2761 GFP_KERNEL);
2762 if (!tmp_bitmap) {
2763 free_page(page);
2764 return -ENOMEM;
2765 }
2766 proc_skip_char(&kbuf, &left, '\n');
2767 while (!err && left) {
2768 unsigned long val_a, val_b;
2769 bool neg;
2770
2771 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2772 sizeof(tr_a), &c);
2773 if (err)
2774 break;
2775 if (val_a >= bitmap_len || neg) {
2776 err = -EINVAL;
2777 break;
2778 }
2779
2780 val_b = val_a;
2781 if (left) {
2782 kbuf++;
2783 left--;
2784 }
2785
2786 if (c == '-') {
2787 err = proc_get_long(&kbuf, &left, &val_b,
2788 &neg, tr_b, sizeof(tr_b),
2789 &c);
2790 if (err)
2791 break;
2792 if (val_b >= bitmap_len || neg ||
2793 val_a > val_b) {
2794 err = -EINVAL;
2795 break;
2796 }
2797 if (left) {
2798 kbuf++;
2799 left--;
2800 }
2801 }
2802
2803 while (val_a <= val_b)
2804 set_bit(val_a++, tmp_bitmap);
2805
2806 first = 0;
2807 proc_skip_char(&kbuf, &left, '\n');
2808 }
2809 free_page(page);
2810 } else {
2811 unsigned long bit_a, bit_b = 0;
2812
2813 while (left) {
2814 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2815 if (bit_a >= bitmap_len)
2816 break;
2817 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2818 bit_a + 1) - 1;
2819
2820 if (!first) {
2821 err = proc_put_char(&buffer, &left, ',');
2822 if (err)
2823 break;
2824 }
2825 err = proc_put_long(&buffer, &left, bit_a, false);
2826 if (err)
2827 break;
2828 if (bit_a != bit_b) {
2829 err = proc_put_char(&buffer, &left, '-');
2830 if (err)
2831 break;
2832 err = proc_put_long(&buffer, &left, bit_b, false);
2833 if (err)
2834 break;
2835 }
2836
2837 first = 0; bit_b++;
2838 }
2839 if (!err)
2840 err = proc_put_char(&buffer, &left, '\n');
2841 }
2842
2843 if (!err) {
2844 if (write) {
2845 if (*ppos)
2846 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2847 else
2848 memcpy(bitmap, tmp_bitmap,
2849 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2850 }
2851 kfree(tmp_bitmap);
2852 *lenp -= left;
2853 *ppos += *lenp;
2854 return 0;
2855 } else {
2856 kfree(tmp_bitmap);
2857 return err;
2858 }
2859 }
2860
2861 #else /* CONFIG_PROC_FS */
2862
2863 int proc_dostring(struct ctl_table *table, int write,
2864 void __user *buffer, size_t *lenp, loff_t *ppos)
2865 {
2866 return -ENOSYS;
2867 }
2868
2869 int proc_dointvec(struct ctl_table *table, int write,
2870 void __user *buffer, size_t *lenp, loff_t *ppos)
2871 {
2872 return -ENOSYS;
2873 }
2874
2875 int proc_dointvec_minmax(struct ctl_table *table, int write,
2876 void __user *buffer, size_t *lenp, loff_t *ppos)
2877 {
2878 return -ENOSYS;
2879 }
2880
2881 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2882 void __user *buffer, size_t *lenp, loff_t *ppos)
2883 {
2884 return -ENOSYS;
2885 }
2886
2887 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2888 void __user *buffer, size_t *lenp, loff_t *ppos)
2889 {
2890 return -ENOSYS;
2891 }
2892
2893 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2894 void __user *buffer, size_t *lenp, loff_t *ppos)
2895 {
2896 return -ENOSYS;
2897 }
2898
2899 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2900 void __user *buffer, size_t *lenp, loff_t *ppos)
2901 {
2902 return -ENOSYS;
2903 }
2904
2905 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2906 void __user *buffer,
2907 size_t *lenp, loff_t *ppos)
2908 {
2909 return -ENOSYS;
2910 }
2911
2912
2913 #endif /* CONFIG_PROC_FS */
2914
2915 /*
2916 * No sense putting this after each symbol definition, twice,
2917 * exception granted :-)
2918 */
2919 EXPORT_SYMBOL(proc_dointvec);
2920 EXPORT_SYMBOL(proc_dointvec_jiffies);
2921 EXPORT_SYMBOL(proc_dointvec_minmax);
2922 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2923 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2924 EXPORT_SYMBOL(proc_dostring);
2925 EXPORT_SYMBOL(proc_doulongvec_minmax);
2926 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2927 EXPORT_SYMBOL(register_sysctl_table);
2928 EXPORT_SYMBOL(register_sysctl_paths);
2929 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree