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reiserfs: make sure va_end() is always called after va_start().
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blobc6811ee2092b165216a09bcd69153e2c0e1093c6
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/printk.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/ctype.h>
31 #include <linux/kmemcheck.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/ratelimit.h>
41 #include <linux/compaction.h>
42 #include <linux/hugetlb.h>
43 #include <linux/initrd.h>
44 #include <linux/key.h>
45 #include <linux/times.h>
46 #include <linux/limits.h>
47 #include <linux/dcache.h>
48 #include <linux/dnotify.h>
49 #include <linux/syscalls.h>
50 #include <linux/vmstat.h>
51 #include <linux/nfs_fs.h>
52 #include <linux/acpi.h>
53 #include <linux/reboot.h>
54 #include <linux/ftrace.h>
55 #include <linux/perf_event.h>
56 #include <linux/kprobes.h>
57 #include <linux/pipe_fs_i.h>
58 #include <linux/oom.h>
59
60 #include <asm/uaccess.h>
61 #include <asm/processor.h>
62
63 #ifdef CONFIG_X86
64 #include <asm/nmi.h>
65 #include <asm/stacktrace.h>
66 #include <asm/io.h>
67 #endif
68 #ifdef CONFIG_BSD_PROCESS_ACCT
69 #include <linux/acct.h>
70 #endif
71 #ifdef CONFIG_RT_MUTEXES
72 #include <linux/rtmutex.h>
73 #endif
74 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
75 #include <linux/lockdep.h>
76 #endif
77 #ifdef CONFIG_CHR_DEV_SG
78 #include <scsi/sg.h>
79 #endif
80
81 #ifdef CONFIG_LOCKUP_DETECTOR
82 #include <linux/nmi.h>
83 #endif
84
85
86 #if defined(CONFIG_SYSCTL)
87
88 /* External variables not in a header file. */
89 extern int sysctl_overcommit_memory;
90 extern int sysctl_overcommit_ratio;
91 extern int max_threads;
92 extern int core_uses_pid;
93 extern int suid_dumpable;
94 extern char core_pattern[];
95 extern unsigned int core_pipe_limit;
96 extern int pid_max;
97 extern int min_free_kbytes;
98 extern int pid_max_min, pid_max_max;
99 extern int sysctl_drop_caches;
100 extern int percpu_pagelist_fraction;
101 extern int compat_log;
102 extern int latencytop_enabled;
103 extern int sysctl_nr_open_min, sysctl_nr_open_max;
104 #ifndef CONFIG_MMU
105 extern int sysctl_nr_trim_pages;
106 #endif
107 #ifdef CONFIG_BLOCK
108 extern int blk_iopoll_enabled;
109 #endif
110
111 /* Constants used for minimum and maximum */
112 #ifdef CONFIG_LOCKUP_DETECTOR
113 static int sixty = 60;
114 static int neg_one = -1;
115 #endif
116
117 static int zero;
118 static int __maybe_unused one = 1;
119 static int __maybe_unused two = 2;
120 static unsigned long one_ul = 1;
121 static int one_hundred = 100;
122 #ifdef CONFIG_PRINTK
123 static int ten_thousand = 10000;
124 #endif
125
126 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
127 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
128
129 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
130 static int maxolduid = 65535;
131 static int minolduid;
132 static int min_percpu_pagelist_fract = 8;
133
134 static int ngroups_max = NGROUPS_MAX;
135
136 #ifdef CONFIG_INOTIFY_USER
137 #include <linux/inotify.h>
138 #endif
139 #ifdef CONFIG_SPARC
140 #include <asm/system.h>
141 #endif
142
143 #ifdef CONFIG_SPARC64
144 extern int sysctl_tsb_ratio;
145 #endif
146
147 #ifdef __hppa__
148 extern int pwrsw_enabled;
149 extern int unaligned_enabled;
150 #endif
151
152 #ifdef CONFIG_S390
153 #ifdef CONFIG_MATHEMU
154 extern int sysctl_ieee_emulation_warnings;
155 #endif
156 extern int sysctl_userprocess_debug;
157 extern int spin_retry;
158 #endif
159
160 #ifdef CONFIG_IA64
161 extern int no_unaligned_warning;
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170 #endif
171
172 #ifdef CONFIG_MAGIC_SYSRQ
173 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
174
175 static int sysrq_sysctl_handler(ctl_table *table, int write,
176 void __user *buffer, size_t *lenp,
177 loff_t *ppos)
178 {
179 int error;
180
181 error = proc_dointvec(table, write, buffer, lenp, ppos);
182 if (error)
183 return error;
184
185 if (write)
186 sysrq_toggle_support(__sysrq_enabled);
187
188 return 0;
189 }
190
191 #endif
192
193 static struct ctl_table root_table[];
194 static struct ctl_table_root sysctl_table_root;
195 static struct ctl_table_header root_table_header = {
196 .count = 1,
197 .ctl_table = root_table,
198 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
199 .root = &sysctl_table_root,
200 .set = &sysctl_table_root.default_set,
201 };
202 static struct ctl_table_root sysctl_table_root = {
203 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
204 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
205 };
206
207 static struct ctl_table kern_table[];
208 static struct ctl_table vm_table[];
209 static struct ctl_table fs_table[];
210 static struct ctl_table debug_table[];
211 static struct ctl_table dev_table[];
212 extern struct ctl_table random_table[];
213 #ifdef CONFIG_EPOLL
214 extern struct ctl_table epoll_table[];
215 #endif
216
217 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
218 int sysctl_legacy_va_layout;
219 #endif
220
221 /* The default sysctl tables: */
222
223 static struct ctl_table root_table[] = {
224 {
225 .procname = "kernel",
226 .mode = 0555,
227 .child = kern_table,
228 },
229 {
230 .procname = "vm",
231 .mode = 0555,
232 .child = vm_table,
233 },
234 {
235 .procname = "fs",
236 .mode = 0555,
237 .child = fs_table,
238 },
239 {
240 .procname = "debug",
241 .mode = 0555,
242 .child = debug_table,
243 },
244 {
245 .procname = "dev",
246 .mode = 0555,
247 .child = dev_table,
248 },
249 /*
250 * NOTE: do not add new entries to this table unless you have read
251 * Documentation/sysctl/ctl_unnumbered.txt
252 */
253 { }
254 };
255
256 #ifdef CONFIG_SCHED_DEBUG
257 static int min_sched_granularity_ns = 100000; /* 100 usecs */
258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
259 static int min_wakeup_granularity_ns; /* 0 usecs */
260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
262 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
263 #endif
264
265 #ifdef CONFIG_COMPACTION
266 static int min_extfrag_threshold;
267 static int max_extfrag_threshold = 1000;
268 #endif
269
270 static struct ctl_table kern_table[] = {
271 {
272 .procname = "sched_child_runs_first",
273 .data = &sysctl_sched_child_runs_first,
274 .maxlen = sizeof(unsigned int),
275 .mode = 0644,
276 .proc_handler = proc_dointvec,
277 },
278 #ifdef CONFIG_SCHED_DEBUG
279 {
280 .procname = "sched_min_granularity_ns",
281 .data = &sysctl_sched_min_granularity,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = sched_proc_update_handler,
285 .extra1 = &min_sched_granularity_ns,
286 .extra2 = &max_sched_granularity_ns,
287 },
288 {
289 .procname = "sched_latency_ns",
290 .data = &sysctl_sched_latency,
291 .maxlen = sizeof(unsigned int),
292 .mode = 0644,
293 .proc_handler = sched_proc_update_handler,
294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
296 },
297 {
298 .procname = "sched_wakeup_granularity_ns",
299 .data = &sysctl_sched_wakeup_granularity,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = sched_proc_update_handler,
303 .extra1 = &min_wakeup_granularity_ns,
304 .extra2 = &max_wakeup_granularity_ns,
305 },
306 {
307 .procname = "sched_tunable_scaling",
308 .data = &sysctl_sched_tunable_scaling,
309 .maxlen = sizeof(enum sched_tunable_scaling),
310 .mode = 0644,
311 .proc_handler = sched_proc_update_handler,
312 .extra1 = &min_sched_tunable_scaling,
313 .extra2 = &max_sched_tunable_scaling,
314 },
315 {
316 .procname = "sched_migration_cost",
317 .data = &sysctl_sched_migration_cost,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec,
321 },
322 {
323 .procname = "sched_nr_migrate",
324 .data = &sysctl_sched_nr_migrate,
325 .maxlen = sizeof(unsigned int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec,
328 },
329 {
330 .procname = "sched_time_avg",
331 .data = &sysctl_sched_time_avg,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec,
335 },
336 {
337 .procname = "sched_shares_window",
338 .data = &sysctl_sched_shares_window,
339 .maxlen = sizeof(unsigned int),
340 .mode = 0644,
341 .proc_handler = proc_dointvec,
342 },
343 {
344 .procname = "timer_migration",
345 .data = &sysctl_timer_migration,
346 .maxlen = sizeof(unsigned int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec_minmax,
349 .extra1 = &zero,
350 .extra2 = &one,
351 },
352 #endif
353 {
354 .procname = "sched_rt_period_us",
355 .data = &sysctl_sched_rt_period,
356 .maxlen = sizeof(unsigned int),
357 .mode = 0644,
358 .proc_handler = sched_rt_handler,
359 },
360 {
361 .procname = "sched_rt_runtime_us",
362 .data = &sysctl_sched_rt_runtime,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = sched_rt_handler,
366 },
367 {
368 .procname = "sched_compat_yield",
369 .data = &sysctl_sched_compat_yield,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 #ifdef CONFIG_SCHED_AUTOGROUP
375 {
376 .procname = "sched_autogroup_enabled",
377 .data = &sysctl_sched_autogroup_enabled,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec,
381 .extra1 = &zero,
382 .extra2 = &one,
383 },
384 #endif
385 #ifdef CONFIG_PROVE_LOCKING
386 {
387 .procname = "prove_locking",
388 .data = &prove_locking,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 #endif
394 #ifdef CONFIG_LOCK_STAT
395 {
396 .procname = "lock_stat",
397 .data = &lock_stat,
398 .maxlen = sizeof(int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 #endif
403 {
404 .procname = "panic",
405 .data = &panic_timeout,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec,
409 },
410 {
411 .procname = "core_uses_pid",
412 .data = &core_uses_pid,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec,
416 },
417 {
418 .procname = "core_pattern",
419 .data = core_pattern,
420 .maxlen = CORENAME_MAX_SIZE,
421 .mode = 0644,
422 .proc_handler = proc_dostring,
423 },
424 {
425 .procname = "core_pipe_limit",
426 .data = &core_pipe_limit,
427 .maxlen = sizeof(unsigned int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec,
430 },
431 #ifdef CONFIG_PROC_SYSCTL
432 {
433 .procname = "tainted",
434 .maxlen = sizeof(long),
435 .mode = 0644,
436 .proc_handler = proc_taint,
437 },
438 #endif
439 #ifdef CONFIG_LATENCYTOP
440 {
441 .procname = "latencytop",
442 .data = &latencytop_enabled,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447 #endif
448 #ifdef CONFIG_BLK_DEV_INITRD
449 {
450 .procname = "real-root-dev",
451 .data = &real_root_dev,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec,
455 },
456 #endif
457 {
458 .procname = "print-fatal-signals",
459 .data = &print_fatal_signals,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec,
463 },
464 #ifdef CONFIG_SPARC
465 {
466 .procname = "reboot-cmd",
467 .data = reboot_command,
468 .maxlen = 256,
469 .mode = 0644,
470 .proc_handler = proc_dostring,
471 },
472 {
473 .procname = "stop-a",
474 .data = &stop_a_enabled,
475 .maxlen = sizeof (int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "scons-poweroff",
481 .data = &scons_pwroff,
482 .maxlen = sizeof (int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 #endif
487 #ifdef CONFIG_SPARC64
488 {
489 .procname = "tsb-ratio",
490 .data = &sysctl_tsb_ratio,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495 #endif
496 #ifdef __hppa__
497 {
498 .procname = "soft-power",
499 .data = &pwrsw_enabled,
500 .maxlen = sizeof (int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 {
505 .procname = "unaligned-trap",
506 .data = &unaligned_enabled,
507 .maxlen = sizeof (int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 #endif
512 {
513 .procname = "ctrl-alt-del",
514 .data = &C_A_D,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #ifdef CONFIG_FUNCTION_TRACER
520 {
521 .procname = "ftrace_enabled",
522 .data = &ftrace_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = ftrace_enable_sysctl,
526 },
527 #endif
528 #ifdef CONFIG_STACK_TRACER
529 {
530 .procname = "stack_tracer_enabled",
531 .data = &stack_tracer_enabled,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = stack_trace_sysctl,
535 },
536 #endif
537 #ifdef CONFIG_TRACING
538 {
539 .procname = "ftrace_dump_on_oops",
540 .data = &ftrace_dump_on_oops,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec,
544 },
545 #endif
546 #ifdef CONFIG_MODULES
547 {
548 .procname = "modprobe",
549 .data = &modprobe_path,
550 .maxlen = KMOD_PATH_LEN,
551 .mode = 0644,
552 .proc_handler = proc_dostring,
553 },
554 {
555 .procname = "modules_disabled",
556 .data = &modules_disabled,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 /* only handle a transition from default "0" to "1" */
560 .proc_handler = proc_dointvec_minmax,
561 .extra1 = &one,
562 .extra2 = &one,
563 },
564 #endif
565 #ifdef CONFIG_HOTPLUG
566 {
567 .procname = "hotplug",
568 .data = &uevent_helper,
569 .maxlen = UEVENT_HELPER_PATH_LEN,
570 .mode = 0644,
571 .proc_handler = proc_dostring,
572 },
573 #endif
574 #ifdef CONFIG_CHR_DEV_SG
575 {
576 .procname = "sg-big-buff",
577 .data = &sg_big_buff,
578 .maxlen = sizeof (int),
579 .mode = 0444,
580 .proc_handler = proc_dointvec,
581 },
582 #endif
583 #ifdef CONFIG_BSD_PROCESS_ACCT
584 {
585 .procname = "acct",
586 .data = &acct_parm,
587 .maxlen = 3*sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591 #endif
592 #ifdef CONFIG_MAGIC_SYSRQ
593 {
594 .procname = "sysrq",
595 .data = &__sysrq_enabled,
596 .maxlen = sizeof (int),
597 .mode = 0644,
598 .proc_handler = sysrq_sysctl_handler,
599 },
600 #endif
601 #ifdef CONFIG_PROC_SYSCTL
602 {
603 .procname = "cad_pid",
604 .data = NULL,
605 .maxlen = sizeof (int),
606 .mode = 0600,
607 .proc_handler = proc_do_cad_pid,
608 },
609 #endif
610 {
611 .procname = "threads-max",
612 .data = &max_threads,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 {
618 .procname = "random",
619 .mode = 0555,
620 .child = random_table,
621 },
622 {
623 .procname = "overflowuid",
624 .data = &overflowuid,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec_minmax,
628 .extra1 = &minolduid,
629 .extra2 = &maxolduid,
630 },
631 {
632 .procname = "overflowgid",
633 .data = &overflowgid,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec_minmax,
637 .extra1 = &minolduid,
638 .extra2 = &maxolduid,
639 },
640 #ifdef CONFIG_S390
641 #ifdef CONFIG_MATHEMU
642 {
643 .procname = "ieee_emulation_warnings",
644 .data = &sysctl_ieee_emulation_warnings,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649 #endif
650 {
651 .procname = "userprocess_debug",
652 .data = &show_unhandled_signals,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec,
656 },
657 #endif
658 {
659 .procname = "pid_max",
660 .data = &pid_max,
661 .maxlen = sizeof (int),
662 .mode = 0644,
663 .proc_handler = proc_dointvec_minmax,
664 .extra1 = &pid_max_min,
665 .extra2 = &pid_max_max,
666 },
667 {
668 .procname = "panic_on_oops",
669 .data = &panic_on_oops,
670 .maxlen = sizeof(int),
671 .mode = 0644,
672 .proc_handler = proc_dointvec,
673 },
674 #if defined CONFIG_PRINTK
675 {
676 .procname = "printk",
677 .data = &console_loglevel,
678 .maxlen = 4*sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 {
683 .procname = "printk_ratelimit",
684 .data = &printk_ratelimit_state.interval,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec_jiffies,
688 },
689 {
690 .procname = "printk_ratelimit_burst",
691 .data = &printk_ratelimit_state.burst,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec,
695 },
696 {
697 .procname = "printk_delay",
698 .data = &printk_delay_msec,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_minmax,
702 .extra1 = &zero,
703 .extra2 = &ten_thousand,
704 },
705 {
706 .procname = "dmesg_restrict",
707 .data = &dmesg_restrict,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec_minmax,
711 .extra1 = &zero,
712 .extra2 = &one,
713 },
714 {
715 .procname = "kptr_restrict",
716 .data = &kptr_restrict,
717 .maxlen = sizeof(int),
718 .mode = 0644,
719 .proc_handler = proc_dointvec_minmax,
720 .extra1 = &zero,
721 .extra2 = &two,
722 },
723 #endif
724 {
725 .procname = "ngroups_max",
726 .data = &ngroups_max,
727 .maxlen = sizeof (int),
728 .mode = 0444,
729 .proc_handler = proc_dointvec,
730 },
731 #if defined(CONFIG_LOCKUP_DETECTOR)
732 {
733 .procname = "watchdog",
734 .data = &watchdog_enabled,
735 .maxlen = sizeof (int),
736 .mode = 0644,
737 .proc_handler = proc_dowatchdog_enabled,
738 },
739 {
740 .procname = "watchdog_thresh",
741 .data = &softlockup_thresh,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dowatchdog_thresh,
745 .extra1 = &neg_one,
746 .extra2 = &sixty,
747 },
748 {
749 .procname = "softlockup_panic",
750 .data = &softlockup_panic,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec_minmax,
754 .extra1 = &zero,
755 .extra2 = &one,
756 },
757 {
758 .procname = "nmi_watchdog",
759 .data = &watchdog_enabled,
760 .maxlen = sizeof (int),
761 .mode = 0644,
762 .proc_handler = proc_dowatchdog_enabled,
763 },
764 #endif
765 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
766 {
767 .procname = "unknown_nmi_panic",
768 .data = &unknown_nmi_panic,
769 .maxlen = sizeof (int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec,
772 },
773 #endif
774 #if defined(CONFIG_X86)
775 {
776 .procname = "panic_on_unrecovered_nmi",
777 .data = &panic_on_unrecovered_nmi,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec,
781 },
782 {
783 .procname = "panic_on_io_nmi",
784 .data = &panic_on_io_nmi,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789 {
790 .procname = "bootloader_type",
791 .data = &bootloader_type,
792 .maxlen = sizeof (int),
793 .mode = 0444,
794 .proc_handler = proc_dointvec,
795 },
796 {
797 .procname = "bootloader_version",
798 .data = &bootloader_version,
799 .maxlen = sizeof (int),
800 .mode = 0444,
801 .proc_handler = proc_dointvec,
802 },
803 {
804 .procname = "kstack_depth_to_print",
805 .data = &kstack_depth_to_print,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec,
809 },
810 {
811 .procname = "io_delay_type",
812 .data = &io_delay_type,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
817 #endif
818 #if defined(CONFIG_MMU)
819 {
820 .procname = "randomize_va_space",
821 .data = &randomize_va_space,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826 #endif
827 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
828 {
829 .procname = "spin_retry",
830 .data = &spin_retry,
831 .maxlen = sizeof (int),
832 .mode = 0644,
833 .proc_handler = proc_dointvec,
834 },
835 #endif
836 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
837 {
838 .procname = "acpi_video_flags",
839 .data = &acpi_realmode_flags,
840 .maxlen = sizeof (unsigned long),
841 .mode = 0644,
842 .proc_handler = proc_doulongvec_minmax,
843 },
844 #endif
845 #ifdef CONFIG_IA64
846 {
847 .procname = "ignore-unaligned-usertrap",
848 .data = &no_unaligned_warning,
849 .maxlen = sizeof (int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec,
852 },
853 {
854 .procname = "unaligned-dump-stack",
855 .data = &unaligned_dump_stack,
856 .maxlen = sizeof (int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec,
859 },
860 #endif
861 #ifdef CONFIG_DETECT_HUNG_TASK
862 {
863 .procname = "hung_task_panic",
864 .data = &sysctl_hung_task_panic,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec_minmax,
868 .extra1 = &zero,
869 .extra2 = &one,
870 },
871 {
872 .procname = "hung_task_check_count",
873 .data = &sysctl_hung_task_check_count,
874 .maxlen = sizeof(unsigned long),
875 .mode = 0644,
876 .proc_handler = proc_doulongvec_minmax,
877 },
878 {
879 .procname = "hung_task_timeout_secs",
880 .data = &sysctl_hung_task_timeout_secs,
881 .maxlen = sizeof(unsigned long),
882 .mode = 0644,
883 .proc_handler = proc_dohung_task_timeout_secs,
884 },
885 {
886 .procname = "hung_task_warnings",
887 .data = &sysctl_hung_task_warnings,
888 .maxlen = sizeof(unsigned long),
889 .mode = 0644,
890 .proc_handler = proc_doulongvec_minmax,
891 },
892 #endif
893 #ifdef CONFIG_COMPAT
894 {
895 .procname = "compat-log",
896 .data = &compat_log,
897 .maxlen = sizeof (int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec,
900 },
901 #endif
902 #ifdef CONFIG_RT_MUTEXES
903 {
904 .procname = "max_lock_depth",
905 .data = &max_lock_depth,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 #endif
911 {
912 .procname = "poweroff_cmd",
913 .data = &poweroff_cmd,
914 .maxlen = POWEROFF_CMD_PATH_LEN,
915 .mode = 0644,
916 .proc_handler = proc_dostring,
917 },
918 #ifdef CONFIG_KEYS
919 {
920 .procname = "keys",
921 .mode = 0555,
922 .child = key_sysctls,
923 },
924 #endif
925 #ifdef CONFIG_RCU_TORTURE_TEST
926 {
927 .procname = "rcutorture_runnable",
928 .data = &rcutorture_runnable,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec,
932 },
933 #endif
934 #ifdef CONFIG_PERF_EVENTS
935 {
936 .procname = "perf_event_paranoid",
937 .data = &sysctl_perf_event_paranoid,
938 .maxlen = sizeof(sysctl_perf_event_paranoid),
939 .mode = 0644,
940 .proc_handler = proc_dointvec,
941 },
942 {
943 .procname = "perf_event_mlock_kb",
944 .data = &sysctl_perf_event_mlock,
945 .maxlen = sizeof(sysctl_perf_event_mlock),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949 {
950 .procname = "perf_event_max_sample_rate",
951 .data = &sysctl_perf_event_sample_rate,
952 .maxlen = sizeof(sysctl_perf_event_sample_rate),
953 .mode = 0644,
954 .proc_handler = proc_dointvec,
955 },
956 #endif
957 #ifdef CONFIG_KMEMCHECK
958 {
959 .procname = "kmemcheck",
960 .data = &kmemcheck_enabled,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec,
964 },
965 #endif
966 #ifdef CONFIG_BLOCK
967 {
968 .procname = "blk_iopoll",
969 .data = &blk_iopoll_enabled,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = proc_dointvec,
973 },
974 #endif
975 /*
976 * NOTE: do not add new entries to this table unless you have read
977 * Documentation/sysctl/ctl_unnumbered.txt
978 */
979 { }
980 };
981
982 static struct ctl_table vm_table[] = {
983 {
984 .procname = "overcommit_memory",
985 .data = &sysctl_overcommit_memory,
986 .maxlen = sizeof(sysctl_overcommit_memory),
987 .mode = 0644,
988 .proc_handler = proc_dointvec,
989 },
990 {
991 .procname = "panic_on_oom",
992 .data = &sysctl_panic_on_oom,
993 .maxlen = sizeof(sysctl_panic_on_oom),
994 .mode = 0644,
995 .proc_handler = proc_dointvec,
996 },
997 {
998 .procname = "oom_kill_allocating_task",
999 .data = &sysctl_oom_kill_allocating_task,
1000 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec,
1003 },
1004 {
1005 .procname = "oom_dump_tasks",
1006 .data = &sysctl_oom_dump_tasks,
1007 .maxlen = sizeof(sysctl_oom_dump_tasks),
1008 .mode = 0644,
1009 .proc_handler = proc_dointvec,
1010 },
1011 {
1012 .procname = "overcommit_ratio",
1013 .data = &sysctl_overcommit_ratio,
1014 .maxlen = sizeof(sysctl_overcommit_ratio),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "page-cluster",
1020 .data = &page_cluster,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 {
1026 .procname = "dirty_background_ratio",
1027 .data = &dirty_background_ratio,
1028 .maxlen = sizeof(dirty_background_ratio),
1029 .mode = 0644,
1030 .proc_handler = dirty_background_ratio_handler,
1031 .extra1 = &zero,
1032 .extra2 = &one_hundred,
1033 },
1034 {
1035 .procname = "dirty_background_bytes",
1036 .data = &dirty_background_bytes,
1037 .maxlen = sizeof(dirty_background_bytes),
1038 .mode = 0644,
1039 .proc_handler = dirty_background_bytes_handler,
1040 .extra1 = &one_ul,
1041 },
1042 {
1043 .procname = "dirty_ratio",
1044 .data = &vm_dirty_ratio,
1045 .maxlen = sizeof(vm_dirty_ratio),
1046 .mode = 0644,
1047 .proc_handler = dirty_ratio_handler,
1048 .extra1 = &zero,
1049 .extra2 = &one_hundred,
1050 },
1051 {
1052 .procname = "dirty_bytes",
1053 .data = &vm_dirty_bytes,
1054 .maxlen = sizeof(vm_dirty_bytes),
1055 .mode = 0644,
1056 .proc_handler = dirty_bytes_handler,
1057 .extra1 = &dirty_bytes_min,
1058 },
1059 {
1060 .procname = "dirty_writeback_centisecs",
1061 .data = &dirty_writeback_interval,
1062 .maxlen = sizeof(dirty_writeback_interval),
1063 .mode = 0644,
1064 .proc_handler = dirty_writeback_centisecs_handler,
1065 },
1066 {
1067 .procname = "dirty_expire_centisecs",
1068 .data = &dirty_expire_interval,
1069 .maxlen = sizeof(dirty_expire_interval),
1070 .mode = 0644,
1071 .proc_handler = proc_dointvec,
1072 },
1073 {
1074 .procname = "nr_pdflush_threads",
1075 .data = &nr_pdflush_threads,
1076 .maxlen = sizeof nr_pdflush_threads,
1077 .mode = 0444 /* read-only*/,
1078 .proc_handler = proc_dointvec,
1079 },
1080 {
1081 .procname = "swappiness",
1082 .data = &vm_swappiness,
1083 .maxlen = sizeof(vm_swappiness),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec_minmax,
1086 .extra1 = &zero,
1087 .extra2 = &one_hundred,
1088 },
1089 #ifdef CONFIG_HUGETLB_PAGE
1090 {
1091 .procname = "nr_hugepages",
1092 .data = NULL,
1093 .maxlen = sizeof(unsigned long),
1094 .mode = 0644,
1095 .proc_handler = hugetlb_sysctl_handler,
1096 .extra1 = (void *)&hugetlb_zero,
1097 .extra2 = (void *)&hugetlb_infinity,
1098 },
1099 #ifdef CONFIG_NUMA
1100 {
1101 .procname = "nr_hugepages_mempolicy",
1102 .data = NULL,
1103 .maxlen = sizeof(unsigned long),
1104 .mode = 0644,
1105 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1106 .extra1 = (void *)&hugetlb_zero,
1107 .extra2 = (void *)&hugetlb_infinity,
1108 },
1109 #endif
1110 {
1111 .procname = "hugetlb_shm_group",
1112 .data = &sysctl_hugetlb_shm_group,
1113 .maxlen = sizeof(gid_t),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec,
1116 },
1117 {
1118 .procname = "hugepages_treat_as_movable",
1119 .data = &hugepages_treat_as_movable,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = hugetlb_treat_movable_handler,
1123 },
1124 {
1125 .procname = "nr_overcommit_hugepages",
1126 .data = NULL,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = hugetlb_overcommit_handler,
1130 .extra1 = (void *)&hugetlb_zero,
1131 .extra2 = (void *)&hugetlb_infinity,
1132 },
1133 #endif
1134 {
1135 .procname = "lowmem_reserve_ratio",
1136 .data = &sysctl_lowmem_reserve_ratio,
1137 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1138 .mode = 0644,
1139 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1140 },
1141 {
1142 .procname = "drop_caches",
1143 .data = &sysctl_drop_caches,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = drop_caches_sysctl_handler,
1147 },
1148 #ifdef CONFIG_COMPACTION
1149 {
1150 .procname = "compact_memory",
1151 .data = &sysctl_compact_memory,
1152 .maxlen = sizeof(int),
1153 .mode = 0200,
1154 .proc_handler = sysctl_compaction_handler,
1155 },
1156 {
1157 .procname = "extfrag_threshold",
1158 .data = &sysctl_extfrag_threshold,
1159 .maxlen = sizeof(int),
1160 .mode = 0644,
1161 .proc_handler = sysctl_extfrag_handler,
1162 .extra1 = &min_extfrag_threshold,
1163 .extra2 = &max_extfrag_threshold,
1164 },
1165
1166 #endif /* CONFIG_COMPACTION */
1167 {
1168 .procname = "min_free_kbytes",
1169 .data = &min_free_kbytes,
1170 .maxlen = sizeof(min_free_kbytes),
1171 .mode = 0644,
1172 .proc_handler = min_free_kbytes_sysctl_handler,
1173 .extra1 = &zero,
1174 },
1175 {
1176 .procname = "percpu_pagelist_fraction",
1177 .data = &percpu_pagelist_fraction,
1178 .maxlen = sizeof(percpu_pagelist_fraction),
1179 .mode = 0644,
1180 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1181 .extra1 = &min_percpu_pagelist_fract,
1182 },
1183 #ifdef CONFIG_MMU
1184 {
1185 .procname = "max_map_count",
1186 .data = &sysctl_max_map_count,
1187 .maxlen = sizeof(sysctl_max_map_count),
1188 .mode = 0644,
1189 .proc_handler = proc_dointvec_minmax,
1190 .extra1 = &zero,
1191 },
1192 #else
1193 {
1194 .procname = "nr_trim_pages",
1195 .data = &sysctl_nr_trim_pages,
1196 .maxlen = sizeof(sysctl_nr_trim_pages),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 },
1201 #endif
1202 {
1203 .procname = "laptop_mode",
1204 .data = &laptop_mode,
1205 .maxlen = sizeof(laptop_mode),
1206 .mode = 0644,
1207 .proc_handler = proc_dointvec_jiffies,
1208 },
1209 {
1210 .procname = "block_dump",
1211 .data = &block_dump,
1212 .maxlen = sizeof(block_dump),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec,
1215 .extra1 = &zero,
1216 },
1217 {
1218 .procname = "vfs_cache_pressure",
1219 .data = &sysctl_vfs_cache_pressure,
1220 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1221 .mode = 0644,
1222 .proc_handler = proc_dointvec,
1223 .extra1 = &zero,
1224 },
1225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1226 {
1227 .procname = "legacy_va_layout",
1228 .data = &sysctl_legacy_va_layout,
1229 .maxlen = sizeof(sysctl_legacy_va_layout),
1230 .mode = 0644,
1231 .proc_handler = proc_dointvec,
1232 .extra1 = &zero,
1233 },
1234 #endif
1235 #ifdef CONFIG_NUMA
1236 {
1237 .procname = "zone_reclaim_mode",
1238 .data = &zone_reclaim_mode,
1239 .maxlen = sizeof(zone_reclaim_mode),
1240 .mode = 0644,
1241 .proc_handler = proc_dointvec,
1242 .extra1 = &zero,
1243 },
1244 {
1245 .procname = "min_unmapped_ratio",
1246 .data = &sysctl_min_unmapped_ratio,
1247 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1248 .mode = 0644,
1249 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1250 .extra1 = &zero,
1251 .extra2 = &one_hundred,
1252 },
1253 {
1254 .procname = "min_slab_ratio",
1255 .data = &sysctl_min_slab_ratio,
1256 .maxlen = sizeof(sysctl_min_slab_ratio),
1257 .mode = 0644,
1258 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1259 .extra1 = &zero,
1260 .extra2 = &one_hundred,
1261 },
1262 #endif
1263 #ifdef CONFIG_SMP
1264 {
1265 .procname = "stat_interval",
1266 .data = &sysctl_stat_interval,
1267 .maxlen = sizeof(sysctl_stat_interval),
1268 .mode = 0644,
1269 .proc_handler = proc_dointvec_jiffies,
1270 },
1271 #endif
1272 #ifdef CONFIG_MMU
1273 {
1274 .procname = "mmap_min_addr",
1275 .data = &dac_mmap_min_addr,
1276 .maxlen = sizeof(unsigned long),
1277 .mode = 0644,
1278 .proc_handler = mmap_min_addr_handler,
1279 },
1280 #endif
1281 #ifdef CONFIG_NUMA
1282 {
1283 .procname = "numa_zonelist_order",
1284 .data = &numa_zonelist_order,
1285 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1286 .mode = 0644,
1287 .proc_handler = numa_zonelist_order_handler,
1288 },
1289 #endif
1290 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1291 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1292 {
1293 .procname = "vdso_enabled",
1294 .data = &vdso_enabled,
1295 .maxlen = sizeof(vdso_enabled),
1296 .mode = 0644,
1297 .proc_handler = proc_dointvec,
1298 .extra1 = &zero,
1299 },
1300 #endif
1301 #ifdef CONFIG_HIGHMEM
1302 {
1303 .procname = "highmem_is_dirtyable",
1304 .data = &vm_highmem_is_dirtyable,
1305 .maxlen = sizeof(vm_highmem_is_dirtyable),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_minmax,
1308 .extra1 = &zero,
1309 .extra2 = &one,
1310 },
1311 #endif
1312 {
1313 .procname = "scan_unevictable_pages",
1314 .data = &scan_unevictable_pages,
1315 .maxlen = sizeof(scan_unevictable_pages),
1316 .mode = 0644,
1317 .proc_handler = scan_unevictable_handler,
1318 },
1319 #ifdef CONFIG_MEMORY_FAILURE
1320 {
1321 .procname = "memory_failure_early_kill",
1322 .data = &sysctl_memory_failure_early_kill,
1323 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1324 .mode = 0644,
1325 .proc_handler = proc_dointvec_minmax,
1326 .extra1 = &zero,
1327 .extra2 = &one,
1328 },
1329 {
1330 .procname = "memory_failure_recovery",
1331 .data = &sysctl_memory_failure_recovery,
1332 .maxlen = sizeof(sysctl_memory_failure_recovery),
1333 .mode = 0644,
1334 .proc_handler = proc_dointvec_minmax,
1335 .extra1 = &zero,
1336 .extra2 = &one,
1337 },
1338 #endif
1339
1340 /*
1341 * NOTE: do not add new entries to this table unless you have read
1342 * Documentation/sysctl/ctl_unnumbered.txt
1343 */
1344 { }
1345 };
1346
1347 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1348 static struct ctl_table binfmt_misc_table[] = {
1349 { }
1350 };
1351 #endif
1352
1353 static struct ctl_table fs_table[] = {
1354 {
1355 .procname = "inode-nr",
1356 .data = &inodes_stat,
1357 .maxlen = 2*sizeof(int),
1358 .mode = 0444,
1359 .proc_handler = proc_nr_inodes,
1360 },
1361 {
1362 .procname = "inode-state",
1363 .data = &inodes_stat,
1364 .maxlen = 7*sizeof(int),
1365 .mode = 0444,
1366 .proc_handler = proc_nr_inodes,
1367 },
1368 {
1369 .procname = "file-nr",
1370 .data = &files_stat,
1371 .maxlen = sizeof(files_stat),
1372 .mode = 0444,
1373 .proc_handler = proc_nr_files,
1374 },
1375 {
1376 .procname = "file-max",
1377 .data = &files_stat.max_files,
1378 .maxlen = sizeof(files_stat.max_files),
1379 .mode = 0644,
1380 .proc_handler = proc_doulongvec_minmax,
1381 },
1382 {
1383 .procname = "nr_open",
1384 .data = &sysctl_nr_open,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec_minmax,
1388 .extra1 = &sysctl_nr_open_min,
1389 .extra2 = &sysctl_nr_open_max,
1390 },
1391 {
1392 .procname = "dentry-state",
1393 .data = &dentry_stat,
1394 .maxlen = 6*sizeof(int),
1395 .mode = 0444,
1396 .proc_handler = proc_nr_dentry,
1397 },
1398 {
1399 .procname = "overflowuid",
1400 .data = &fs_overflowuid,
1401 .maxlen = sizeof(int),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec_minmax,
1404 .extra1 = &minolduid,
1405 .extra2 = &maxolduid,
1406 },
1407 {
1408 .procname = "overflowgid",
1409 .data = &fs_overflowgid,
1410 .maxlen = sizeof(int),
1411 .mode = 0644,
1412 .proc_handler = proc_dointvec_minmax,
1413 .extra1 = &minolduid,
1414 .extra2 = &maxolduid,
1415 },
1416 #ifdef CONFIG_FILE_LOCKING
1417 {
1418 .procname = "leases-enable",
1419 .data = &leases_enable,
1420 .maxlen = sizeof(int),
1421 .mode = 0644,
1422 .proc_handler = proc_dointvec,
1423 },
1424 #endif
1425 #ifdef CONFIG_DNOTIFY
1426 {
1427 .procname = "dir-notify-enable",
1428 .data = &dir_notify_enable,
1429 .maxlen = sizeof(int),
1430 .mode = 0644,
1431 .proc_handler = proc_dointvec,
1432 },
1433 #endif
1434 #ifdef CONFIG_MMU
1435 #ifdef CONFIG_FILE_LOCKING
1436 {
1437 .procname = "lease-break-time",
1438 .data = &lease_break_time,
1439 .maxlen = sizeof(int),
1440 .mode = 0644,
1441 .proc_handler = proc_dointvec,
1442 },
1443 #endif
1444 #ifdef CONFIG_AIO
1445 {
1446 .procname = "aio-nr",
1447 .data = &aio_nr,
1448 .maxlen = sizeof(aio_nr),
1449 .mode = 0444,
1450 .proc_handler = proc_doulongvec_minmax,
1451 },
1452 {
1453 .procname = "aio-max-nr",
1454 .data = &aio_max_nr,
1455 .maxlen = sizeof(aio_max_nr),
1456 .mode = 0644,
1457 .proc_handler = proc_doulongvec_minmax,
1458 },
1459 #endif /* CONFIG_AIO */
1460 #ifdef CONFIG_INOTIFY_USER
1461 {
1462 .procname = "inotify",
1463 .mode = 0555,
1464 .child = inotify_table,
1465 },
1466 #endif
1467 #ifdef CONFIG_EPOLL
1468 {
1469 .procname = "epoll",
1470 .mode = 0555,
1471 .child = epoll_table,
1472 },
1473 #endif
1474 #endif
1475 {
1476 .procname = "suid_dumpable",
1477 .data = &suid_dumpable,
1478 .maxlen = sizeof(int),
1479 .mode = 0644,
1480 .proc_handler = proc_dointvec_minmax,
1481 .extra1 = &zero,
1482 .extra2 = &two,
1483 },
1484 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1485 {
1486 .procname = "binfmt_misc",
1487 .mode = 0555,
1488 .child = binfmt_misc_table,
1489 },
1490 #endif
1491 {
1492 .procname = "pipe-max-size",
1493 .data = &pipe_max_size,
1494 .maxlen = sizeof(int),
1495 .mode = 0644,
1496 .proc_handler = &pipe_proc_fn,
1497 .extra1 = &pipe_min_size,
1498 },
1499 /*
1500 * NOTE: do not add new entries to this table unless you have read
1501 * Documentation/sysctl/ctl_unnumbered.txt
1502 */
1503 { }
1504 };
1505
1506 static struct ctl_table debug_table[] = {
1507 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1508 defined(CONFIG_S390)
1509 {
1510 .procname = "exception-trace",
1511 .data = &show_unhandled_signals,
1512 .maxlen = sizeof(int),
1513 .mode = 0644,
1514 .proc_handler = proc_dointvec
1515 },
1516 #endif
1517 #if defined(CONFIG_OPTPROBES)
1518 {
1519 .procname = "kprobes-optimization",
1520 .data = &sysctl_kprobes_optimization,
1521 .maxlen = sizeof(int),
1522 .mode = 0644,
1523 .proc_handler = proc_kprobes_optimization_handler,
1524 .extra1 = &zero,
1525 .extra2 = &one,
1526 },
1527 #endif
1528 { }
1529 };
1530
1531 static struct ctl_table dev_table[] = {
1532 { }
1533 };
1534
1535 static DEFINE_SPINLOCK(sysctl_lock);
1536
1537 /* called under sysctl_lock */
1538 static int use_table(struct ctl_table_header *p)
1539 {
1540 if (unlikely(p->unregistering))
1541 return 0;
1542 p->used++;
1543 return 1;
1544 }
1545
1546 /* called under sysctl_lock */
1547 static void unuse_table(struct ctl_table_header *p)
1548 {
1549 if (!--p->used)
1550 if (unlikely(p->unregistering))
1551 complete(p->unregistering);
1552 }
1553
1554 /* called under sysctl_lock, will reacquire if has to wait */
1555 static void start_unregistering(struct ctl_table_header *p)
1556 {
1557 /*
1558 * if p->used is 0, nobody will ever touch that entry again;
1559 * we'll eliminate all paths to it before dropping sysctl_lock
1560 */
1561 if (unlikely(p->used)) {
1562 struct completion wait;
1563 init_completion(&wait);
1564 p->unregistering = &wait;
1565 spin_unlock(&sysctl_lock);
1566 wait_for_completion(&wait);
1567 spin_lock(&sysctl_lock);
1568 } else {
1569 /* anything non-NULL; we'll never dereference it */
1570 p->unregistering = ERR_PTR(-EINVAL);
1571 }
1572 /*
1573 * do not remove from the list until nobody holds it; walking the
1574 * list in do_sysctl() relies on that.
1575 */
1576 list_del_init(&p->ctl_entry);
1577 }
1578
1579 void sysctl_head_get(struct ctl_table_header *head)
1580 {
1581 spin_lock(&sysctl_lock);
1582 head->count++;
1583 spin_unlock(&sysctl_lock);
1584 }
1585
1586 void sysctl_head_put(struct ctl_table_header *head)
1587 {
1588 spin_lock(&sysctl_lock);
1589 if (!--head->count)
1590 kfree(head);
1591 spin_unlock(&sysctl_lock);
1592 }
1593
1594 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1595 {
1596 if (!head)
1597 BUG();
1598 spin_lock(&sysctl_lock);
1599 if (!use_table(head))
1600 head = ERR_PTR(-ENOENT);
1601 spin_unlock(&sysctl_lock);
1602 return head;
1603 }
1604
1605 void sysctl_head_finish(struct ctl_table_header *head)
1606 {
1607 if (!head)
1608 return;
1609 spin_lock(&sysctl_lock);
1610 unuse_table(head);
1611 spin_unlock(&sysctl_lock);
1612 }
1613
1614 static struct ctl_table_set *
1615 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1616 {
1617 struct ctl_table_set *set = &root->default_set;
1618 if (root->lookup)
1619 set = root->lookup(root, namespaces);
1620 return set;
1621 }
1622
1623 static struct list_head *
1624 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1625 {
1626 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1627 return &set->list;
1628 }
1629
1630 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1631 struct ctl_table_header *prev)
1632 {
1633 struct ctl_table_root *root;
1634 struct list_head *header_list;
1635 struct ctl_table_header *head;
1636 struct list_head *tmp;
1637
1638 spin_lock(&sysctl_lock);
1639 if (prev) {
1640 head = prev;
1641 tmp = &prev->ctl_entry;
1642 unuse_table(prev);
1643 goto next;
1644 }
1645 tmp = &root_table_header.ctl_entry;
1646 for (;;) {
1647 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1648
1649 if (!use_table(head))
1650 goto next;
1651 spin_unlock(&sysctl_lock);
1652 return head;
1653 next:
1654 root = head->root;
1655 tmp = tmp->next;
1656 header_list = lookup_header_list(root, namespaces);
1657 if (tmp != header_list)
1658 continue;
1659
1660 do {
1661 root = list_entry(root->root_list.next,
1662 struct ctl_table_root, root_list);
1663 if (root == &sysctl_table_root)
1664 goto out;
1665 header_list = lookup_header_list(root, namespaces);
1666 } while (list_empty(header_list));
1667 tmp = header_list->next;
1668 }
1669 out:
1670 spin_unlock(&sysctl_lock);
1671 return NULL;
1672 }
1673
1674 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1675 {
1676 return __sysctl_head_next(current->nsproxy, prev);
1677 }
1678
1679 void register_sysctl_root(struct ctl_table_root *root)
1680 {
1681 spin_lock(&sysctl_lock);
1682 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1683 spin_unlock(&sysctl_lock);
1684 }
1685
1686 /*
1687 * sysctl_perm does NOT grant the superuser all rights automatically, because
1688 * some sysctl variables are readonly even to root.
1689 */
1690
1691 static int test_perm(int mode, int op)
1692 {
1693 if (!current_euid())
1694 mode >>= 6;
1695 else if (in_egroup_p(0))
1696 mode >>= 3;
1697 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1698 return 0;
1699 return -EACCES;
1700 }
1701
1702 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1703 {
1704 int error;
1705 int mode;
1706
1707 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1708 if (error)
1709 return error;
1710
1711 if (root->permissions)
1712 mode = root->permissions(root, current->nsproxy, table);
1713 else
1714 mode = table->mode;
1715
1716 return test_perm(mode, op);
1717 }
1718
1719 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1720 {
1721 for (; table->procname; table++) {
1722 table->parent = parent;
1723 if (table->child)
1724 sysctl_set_parent(table, table->child);
1725 }
1726 }
1727
1728 static __init int sysctl_init(void)
1729 {
1730 sysctl_set_parent(NULL, root_table);
1731 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1732 sysctl_check_table(current->nsproxy, root_table);
1733 #endif
1734 return 0;
1735 }
1736
1737 core_initcall(sysctl_init);
1738
1739 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1740 struct ctl_table *table)
1741 {
1742 struct ctl_table *p;
1743 const char *s = branch->procname;
1744
1745 /* branch should have named subdirectory as its first element */
1746 if (!s || !branch->child)
1747 return NULL;
1748
1749 /* ... and nothing else */
1750 if (branch[1].procname)
1751 return NULL;
1752
1753 /* table should contain subdirectory with the same name */
1754 for (p = table; p->procname; p++) {
1755 if (!p->child)
1756 continue;
1757 if (p->procname && strcmp(p->procname, s) == 0)
1758 return p;
1759 }
1760 return NULL;
1761 }
1762
1763 /* see if attaching q to p would be an improvement */
1764 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1765 {
1766 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1767 struct ctl_table *next;
1768 int is_better = 0;
1769 int not_in_parent = !p->attached_by;
1770
1771 while ((next = is_branch_in(by, to)) != NULL) {
1772 if (by == q->attached_by)
1773 is_better = 1;
1774 if (to == p->attached_by)
1775 not_in_parent = 1;
1776 by = by->child;
1777 to = next->child;
1778 }
1779
1780 if (is_better && not_in_parent) {
1781 q->attached_by = by;
1782 q->attached_to = to;
1783 q->parent = p;
1784 }
1785 }
1786
1787 /**
1788 * __register_sysctl_paths - register a sysctl hierarchy
1789 * @root: List of sysctl headers to register on
1790 * @namespaces: Data to compute which lists of sysctl entries are visible
1791 * @path: The path to the directory the sysctl table is in.
1792 * @table: the top-level table structure
1793 *
1794 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1795 * array. A completely 0 filled entry terminates the table.
1796 *
1797 * The members of the &struct ctl_table structure are used as follows:
1798 *
1799 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1800 * enter a sysctl file
1801 *
1802 * data - a pointer to data for use by proc_handler
1803 *
1804 * maxlen - the maximum size in bytes of the data
1805 *
1806 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1807 *
1808 * child - a pointer to the child sysctl table if this entry is a directory, or
1809 * %NULL.
1810 *
1811 * proc_handler - the text handler routine (described below)
1812 *
1813 * de - for internal use by the sysctl routines
1814 *
1815 * extra1, extra2 - extra pointers usable by the proc handler routines
1816 *
1817 * Leaf nodes in the sysctl tree will be represented by a single file
1818 * under /proc; non-leaf nodes will be represented by directories.
1819 *
1820 * sysctl(2) can automatically manage read and write requests through
1821 * the sysctl table. The data and maxlen fields of the ctl_table
1822 * struct enable minimal validation of the values being written to be
1823 * performed, and the mode field allows minimal authentication.
1824 *
1825 * There must be a proc_handler routine for any terminal nodes
1826 * mirrored under /proc/sys (non-terminals are handled by a built-in
1827 * directory handler). Several default handlers are available to
1828 * cover common cases -
1829 *
1830 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1831 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1832 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1833 *
1834 * It is the handler's job to read the input buffer from user memory
1835 * and process it. The handler should return 0 on success.
1836 *
1837 * This routine returns %NULL on a failure to register, and a pointer
1838 * to the table header on success.
1839 */
1840 struct ctl_table_header *__register_sysctl_paths(
1841 struct ctl_table_root *root,
1842 struct nsproxy *namespaces,
1843 const struct ctl_path *path, struct ctl_table *table)
1844 {
1845 struct ctl_table_header *header;
1846 struct ctl_table *new, **prevp;
1847 unsigned int n, npath;
1848 struct ctl_table_set *set;
1849
1850 /* Count the path components */
1851 for (npath = 0; path[npath].procname; ++npath)
1852 ;
1853
1854 /*
1855 * For each path component, allocate a 2-element ctl_table array.
1856 * The first array element will be filled with the sysctl entry
1857 * for this, the second will be the sentinel (procname == 0).
1858 *
1859 * We allocate everything in one go so that we don't have to
1860 * worry about freeing additional memory in unregister_sysctl_table.
1861 */
1862 header = kzalloc(sizeof(struct ctl_table_header) +
1863 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1864 if (!header)
1865 return NULL;
1866
1867 new = (struct ctl_table *) (header + 1);
1868
1869 /* Now connect the dots */
1870 prevp = &header->ctl_table;
1871 for (n = 0; n < npath; ++n, ++path) {
1872 /* Copy the procname */
1873 new->procname = path->procname;
1874 new->mode = 0555;
1875
1876 *prevp = new;
1877 prevp = &new->child;
1878
1879 new += 2;
1880 }
1881 *prevp = table;
1882 header->ctl_table_arg = table;
1883
1884 INIT_LIST_HEAD(&header->ctl_entry);
1885 header->used = 0;
1886 header->unregistering = NULL;
1887 header->root = root;
1888 sysctl_set_parent(NULL, header->ctl_table);
1889 header->count = 1;
1890 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1891 if (sysctl_check_table(namespaces, header->ctl_table)) {
1892 kfree(header);
1893 return NULL;
1894 }
1895 #endif
1896 spin_lock(&sysctl_lock);
1897 header->set = lookup_header_set(root, namespaces);
1898 header->attached_by = header->ctl_table;
1899 header->attached_to = root_table;
1900 header->parent = &root_table_header;
1901 for (set = header->set; set; set = set->parent) {
1902 struct ctl_table_header *p;
1903 list_for_each_entry(p, &set->list, ctl_entry) {
1904 if (p->unregistering)
1905 continue;
1906 try_attach(p, header);
1907 }
1908 }
1909 header->parent->count++;
1910 list_add_tail(&header->ctl_entry, &header->set->list);
1911 spin_unlock(&sysctl_lock);
1912
1913 return header;
1914 }
1915
1916 /**
1917 * register_sysctl_table_path - register a sysctl table hierarchy
1918 * @path: The path to the directory the sysctl table is in.
1919 * @table: the top-level table structure
1920 *
1921 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1922 * array. A completely 0 filled entry terminates the table.
1923 *
1924 * See __register_sysctl_paths for more details.
1925 */
1926 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1927 struct ctl_table *table)
1928 {
1929 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1930 path, table);
1931 }
1932
1933 /**
1934 * register_sysctl_table - register a sysctl table hierarchy
1935 * @table: the top-level table structure
1936 *
1937 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1938 * array. A completely 0 filled entry terminates the table.
1939 *
1940 * See register_sysctl_paths for more details.
1941 */
1942 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1943 {
1944 static const struct ctl_path null_path[] = { {} };
1945
1946 return register_sysctl_paths(null_path, table);
1947 }
1948
1949 /**
1950 * unregister_sysctl_table - unregister a sysctl table hierarchy
1951 * @header: the header returned from register_sysctl_table
1952 *
1953 * Unregisters the sysctl table and all children. proc entries may not
1954 * actually be removed until they are no longer used by anyone.
1955 */
1956 void unregister_sysctl_table(struct ctl_table_header * header)
1957 {
1958 might_sleep();
1959
1960 if (header == NULL)
1961 return;
1962
1963 spin_lock(&sysctl_lock);
1964 start_unregistering(header);
1965 if (!--header->parent->count) {
1966 WARN_ON(1);
1967 kfree(header->parent);
1968 }
1969 if (!--header->count)
1970 kfree(header);
1971 spin_unlock(&sysctl_lock);
1972 }
1973
1974 int sysctl_is_seen(struct ctl_table_header *p)
1975 {
1976 struct ctl_table_set *set = p->set;
1977 int res;
1978 spin_lock(&sysctl_lock);
1979 if (p->unregistering)
1980 res = 0;
1981 else if (!set->is_seen)
1982 res = 1;
1983 else
1984 res = set->is_seen(set);
1985 spin_unlock(&sysctl_lock);
1986 return res;
1987 }
1988
1989 void setup_sysctl_set(struct ctl_table_set *p,
1990 struct ctl_table_set *parent,
1991 int (*is_seen)(struct ctl_table_set *))
1992 {
1993 INIT_LIST_HEAD(&p->list);
1994 p->parent = parent ? parent : &sysctl_table_root.default_set;
1995 p->is_seen = is_seen;
1996 }
1997
1998 #else /* !CONFIG_SYSCTL */
1999 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2000 {
2001 return NULL;
2002 }
2003
2004 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2005 struct ctl_table *table)
2006 {
2007 return NULL;
2008 }
2009
2010 void unregister_sysctl_table(struct ctl_table_header * table)
2011 {
2012 }
2013
2014 void setup_sysctl_set(struct ctl_table_set *p,
2015 struct ctl_table_set *parent,
2016 int (*is_seen)(struct ctl_table_set *))
2017 {
2018 }
2019
2020 void sysctl_head_put(struct ctl_table_header *head)
2021 {
2022 }
2023
2024 #endif /* CONFIG_SYSCTL */
2025
2026 /*
2027 * /proc/sys support
2028 */
2029
2030 #ifdef CONFIG_PROC_SYSCTL
2031
2032 static int _proc_do_string(void* data, int maxlen, int write,
2033 void __user *buffer,
2034 size_t *lenp, loff_t *ppos)
2035 {
2036 size_t len;
2037 char __user *p;
2038 char c;
2039
2040 if (!data || !maxlen || !*lenp) {
2041 *lenp = 0;
2042 return 0;
2043 }
2044
2045 if (write) {
2046 len = 0;
2047 p = buffer;
2048 while (len < *lenp) {
2049 if (get_user(c, p++))
2050 return -EFAULT;
2051 if (c == 0 || c == '\n')
2052 break;
2053 len++;
2054 }
2055 if (len >= maxlen)
2056 len = maxlen-1;
2057 if(copy_from_user(data, buffer, len))
2058 return -EFAULT;
2059 ((char *) data)[len] = 0;
2060 *ppos += *lenp;
2061 } else {
2062 len = strlen(data);
2063 if (len > maxlen)
2064 len = maxlen;
2065
2066 if (*ppos > len) {
2067 *lenp = 0;
2068 return 0;
2069 }
2070
2071 data += *ppos;
2072 len -= *ppos;
2073
2074 if (len > *lenp)
2075 len = *lenp;
2076 if (len)
2077 if(copy_to_user(buffer, data, len))
2078 return -EFAULT;
2079 if (len < *lenp) {
2080 if(put_user('\n', ((char __user *) buffer) + len))
2081 return -EFAULT;
2082 len++;
2083 }
2084 *lenp = len;
2085 *ppos += len;
2086 }
2087 return 0;
2088 }
2089
2090 /**
2091 * proc_dostring - read a string sysctl
2092 * @table: the sysctl table
2093 * @write: %TRUE if this is a write to the sysctl file
2094 * @buffer: the user buffer
2095 * @lenp: the size of the user buffer
2096 * @ppos: file position
2097 *
2098 * Reads/writes a string from/to the user buffer. If the kernel
2099 * buffer provided is not large enough to hold the string, the
2100 * string is truncated. The copied string is %NULL-terminated.
2101 * If the string is being read by the user process, it is copied
2102 * and a newline '\n' is added. It is truncated if the buffer is
2103 * not large enough.
2104 *
2105 * Returns 0 on success.
2106 */
2107 int proc_dostring(struct ctl_table *table, int write,
2108 void __user *buffer, size_t *lenp, loff_t *ppos)
2109 {
2110 return _proc_do_string(table->data, table->maxlen, write,
2111 buffer, lenp, ppos);
2112 }
2113
2114 static size_t proc_skip_spaces(char **buf)
2115 {
2116 size_t ret;
2117 char *tmp = skip_spaces(*buf);
2118 ret = tmp - *buf;
2119 *buf = tmp;
2120 return ret;
2121 }
2122
2123 static void proc_skip_char(char **buf, size_t *size, const char v)
2124 {
2125 while (*size) {
2126 if (**buf != v)
2127 break;
2128 (*size)--;
2129 (*buf)++;
2130 }
2131 }
2132
2133 #define TMPBUFLEN 22
2134 /**
2135 * proc_get_long - reads an ASCII formatted integer from a user buffer
2136 *
2137 * @buf: a kernel buffer
2138 * @size: size of the kernel buffer
2139 * @val: this is where the number will be stored
2140 * @neg: set to %TRUE if number is negative
2141 * @perm_tr: a vector which contains the allowed trailers
2142 * @perm_tr_len: size of the perm_tr vector
2143 * @tr: pointer to store the trailer character
2144 *
2145 * In case of success %0 is returned and @buf and @size are updated with
2146 * the amount of bytes read. If @tr is non-NULL and a trailing
2147 * character exists (size is non-zero after returning from this
2148 * function), @tr is updated with the trailing character.
2149 */
2150 static int proc_get_long(char **buf, size_t *size,
2151 unsigned long *val, bool *neg,
2152 const char *perm_tr, unsigned perm_tr_len, char *tr)
2153 {
2154 int len;
2155 char *p, tmp[TMPBUFLEN];
2156
2157 if (!*size)
2158 return -EINVAL;
2159
2160 len = *size;
2161 if (len > TMPBUFLEN - 1)
2162 len = TMPBUFLEN - 1;
2163
2164 memcpy(tmp, *buf, len);
2165
2166 tmp[len] = 0;
2167 p = tmp;
2168 if (*p == '-' && *size > 1) {
2169 *neg = true;
2170 p++;
2171 } else
2172 *neg = false;
2173 if (!isdigit(*p))
2174 return -EINVAL;
2175
2176 *val = simple_strtoul(p, &p, 0);
2177
2178 len = p - tmp;
2179
2180 /* We don't know if the next char is whitespace thus we may accept
2181 * invalid integers (e.g. 1234...a) or two integers instead of one
2182 * (e.g. 123...1). So lets not allow such large numbers. */
2183 if (len == TMPBUFLEN - 1)
2184 return -EINVAL;
2185
2186 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2187 return -EINVAL;
2188
2189 if (tr && (len < *size))
2190 *tr = *p;
2191
2192 *buf += len;
2193 *size -= len;
2194
2195 return 0;
2196 }
2197
2198 /**
2199 * proc_put_long - converts an integer to a decimal ASCII formatted string
2200 *
2201 * @buf: the user buffer
2202 * @size: the size of the user buffer
2203 * @val: the integer to be converted
2204 * @neg: sign of the number, %TRUE for negative
2205 *
2206 * In case of success %0 is returned and @buf and @size are updated with
2207 * the amount of bytes written.
2208 */
2209 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2210 bool neg)
2211 {
2212 int len;
2213 char tmp[TMPBUFLEN], *p = tmp;
2214
2215 sprintf(p, "%s%lu", neg ? "-" : "", val);
2216 len = strlen(tmp);
2217 if (len > *size)
2218 len = *size;
2219 if (copy_to_user(*buf, tmp, len))
2220 return -EFAULT;
2221 *size -= len;
2222 *buf += len;
2223 return 0;
2224 }
2225 #undef TMPBUFLEN
2226
2227 static int proc_put_char(void __user **buf, size_t *size, char c)
2228 {
2229 if (*size) {
2230 char __user **buffer = (char __user **)buf;
2231 if (put_user(c, *buffer))
2232 return -EFAULT;
2233 (*size)--, (*buffer)++;
2234 *buf = *buffer;
2235 }
2236 return 0;
2237 }
2238
2239 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2240 int *valp,
2241 int write, void *data)
2242 {
2243 if (write) {
2244 *valp = *negp ? -*lvalp : *lvalp;
2245 } else {
2246 int val = *valp;
2247 if (val < 0) {
2248 *negp = true;
2249 *lvalp = (unsigned long)-val;
2250 } else {
2251 *negp = false;
2252 *lvalp = (unsigned long)val;
2253 }
2254 }
2255 return 0;
2256 }
2257
2258 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2259
2260 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2261 int write, void __user *buffer,
2262 size_t *lenp, loff_t *ppos,
2263 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2264 int write, void *data),
2265 void *data)
2266 {
2267 int *i, vleft, first = 1, err = 0;
2268 unsigned long page = 0;
2269 size_t left;
2270 char *kbuf;
2271
2272 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2273 *lenp = 0;
2274 return 0;
2275 }
2276
2277 i = (int *) tbl_data;
2278 vleft = table->maxlen / sizeof(*i);
2279 left = *lenp;
2280
2281 if (!conv)
2282 conv = do_proc_dointvec_conv;
2283
2284 if (write) {
2285 if (left > PAGE_SIZE - 1)
2286 left = PAGE_SIZE - 1;
2287 page = __get_free_page(GFP_TEMPORARY);
2288 kbuf = (char *) page;
2289 if (!kbuf)
2290 return -ENOMEM;
2291 if (copy_from_user(kbuf, buffer, left)) {
2292 err = -EFAULT;
2293 goto free;
2294 }
2295 kbuf[left] = 0;
2296 }
2297
2298 for (; left && vleft--; i++, first=0) {
2299 unsigned long lval;
2300 bool neg;
2301
2302 if (write) {
2303 left -= proc_skip_spaces(&kbuf);
2304
2305 if (!left)
2306 break;
2307 err = proc_get_long(&kbuf, &left, &lval, &neg,
2308 proc_wspace_sep,
2309 sizeof(proc_wspace_sep), NULL);
2310 if (err)
2311 break;
2312 if (conv(&neg, &lval, i, 1, data)) {
2313 err = -EINVAL;
2314 break;
2315 }
2316 } else {
2317 if (conv(&neg, &lval, i, 0, data)) {
2318 err = -EINVAL;
2319 break;
2320 }
2321 if (!first)
2322 err = proc_put_char(&buffer, &left, '\t');
2323 if (err)
2324 break;
2325 err = proc_put_long(&buffer, &left, lval, neg);
2326 if (err)
2327 break;
2328 }
2329 }
2330
2331 if (!write && !first && left && !err)
2332 err = proc_put_char(&buffer, &left, '\n');
2333 if (write && !err && left)
2334 left -= proc_skip_spaces(&kbuf);
2335 free:
2336 if (write) {
2337 free_page(page);
2338 if (first)
2339 return err ? : -EINVAL;
2340 }
2341 *lenp -= left;
2342 *ppos += *lenp;
2343 return err;
2344 }
2345
2346 static int do_proc_dointvec(struct ctl_table *table, int write,
2347 void __user *buffer, size_t *lenp, loff_t *ppos,
2348 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2349 int write, void *data),
2350 void *data)
2351 {
2352 return __do_proc_dointvec(table->data, table, write,
2353 buffer, lenp, ppos, conv, data);
2354 }
2355
2356 /**
2357 * proc_dointvec - read a vector of integers
2358 * @table: the sysctl table
2359 * @write: %TRUE if this is a write to the sysctl file
2360 * @buffer: the user buffer
2361 * @lenp: the size of the user buffer
2362 * @ppos: file position
2363 *
2364 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2365 * values from/to the user buffer, treated as an ASCII string.
2366 *
2367 * Returns 0 on success.
2368 */
2369 int proc_dointvec(struct ctl_table *table, int write,
2370 void __user *buffer, size_t *lenp, loff_t *ppos)
2371 {
2372 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2373 NULL,NULL);
2374 }
2375
2376 /*
2377 * Taint values can only be increased
2378 * This means we can safely use a temporary.
2379 */
2380 static int proc_taint(struct ctl_table *table, int write,
2381 void __user *buffer, size_t *lenp, loff_t *ppos)
2382 {
2383 struct ctl_table t;
2384 unsigned long tmptaint = get_taint();
2385 int err;
2386
2387 if (write && !capable(CAP_SYS_ADMIN))
2388 return -EPERM;
2389
2390 t = *table;
2391 t.data = &tmptaint;
2392 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2393 if (err < 0)
2394 return err;
2395
2396 if (write) {
2397 /*
2398 * Poor man's atomic or. Not worth adding a primitive
2399 * to everyone's atomic.h for this
2400 */
2401 int i;
2402 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2403 if ((tmptaint >> i) & 1)
2404 add_taint(i);
2405 }
2406 }
2407
2408 return err;
2409 }
2410
2411 struct do_proc_dointvec_minmax_conv_param {
2412 int *min;
2413 int *max;
2414 };
2415
2416 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2417 int *valp,
2418 int write, void *data)
2419 {
2420 struct do_proc_dointvec_minmax_conv_param *param = data;
2421 if (write) {
2422 int val = *negp ? -*lvalp : *lvalp;
2423 if ((param->min && *param->min > val) ||
2424 (param->max && *param->max < val))
2425 return -EINVAL;
2426 *valp = val;
2427 } else {
2428 int val = *valp;
2429 if (val < 0) {
2430 *negp = true;
2431 *lvalp = (unsigned long)-val;
2432 } else {
2433 *negp = false;
2434 *lvalp = (unsigned long)val;
2435 }
2436 }
2437 return 0;
2438 }
2439
2440 /**
2441 * proc_dointvec_minmax - read a vector of integers with min/max values
2442 * @table: the sysctl table
2443 * @write: %TRUE if this is a write to the sysctl file
2444 * @buffer: the user buffer
2445 * @lenp: the size of the user buffer
2446 * @ppos: file position
2447 *
2448 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2449 * values from/to the user buffer, treated as an ASCII string.
2450 *
2451 * This routine will ensure the values are within the range specified by
2452 * table->extra1 (min) and table->extra2 (max).
2453 *
2454 * Returns 0 on success.
2455 */
2456 int proc_dointvec_minmax(struct ctl_table *table, int write,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459 struct do_proc_dointvec_minmax_conv_param param = {
2460 .min = (int *) table->extra1,
2461 .max = (int *) table->extra2,
2462 };
2463 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2464 do_proc_dointvec_minmax_conv, &param);
2465 }
2466
2467 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2468 void __user *buffer,
2469 size_t *lenp, loff_t *ppos,
2470 unsigned long convmul,
2471 unsigned long convdiv)
2472 {
2473 unsigned long *i, *min, *max;
2474 int vleft, first = 1, err = 0;
2475 unsigned long page = 0;
2476 size_t left;
2477 char *kbuf;
2478
2479 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2480 *lenp = 0;
2481 return 0;
2482 }
2483
2484 i = (unsigned long *) data;
2485 min = (unsigned long *) table->extra1;
2486 max = (unsigned long *) table->extra2;
2487 vleft = table->maxlen / sizeof(unsigned long);
2488 left = *lenp;
2489
2490 if (write) {
2491 if (left > PAGE_SIZE - 1)
2492 left = PAGE_SIZE - 1;
2493 page = __get_free_page(GFP_TEMPORARY);
2494 kbuf = (char *) page;
2495 if (!kbuf)
2496 return -ENOMEM;
2497 if (copy_from_user(kbuf, buffer, left)) {
2498 err = -EFAULT;
2499 goto free;
2500 }
2501 kbuf[left] = 0;
2502 }
2503
2504 for (; left && vleft--; i++, first = 0) {
2505 unsigned long val;
2506
2507 if (write) {
2508 bool neg;
2509
2510 left -= proc_skip_spaces(&kbuf);
2511
2512 err = proc_get_long(&kbuf, &left, &val, &neg,
2513 proc_wspace_sep,
2514 sizeof(proc_wspace_sep), NULL);
2515 if (err)
2516 break;
2517 if (neg)
2518 continue;
2519 if ((min && val < *min) || (max && val > *max))
2520 continue;
2521 *i = val;
2522 } else {
2523 val = convdiv * (*i) / convmul;
2524 if (!first)
2525 err = proc_put_char(&buffer, &left, '\t');
2526 err = proc_put_long(&buffer, &left, val, false);
2527 if (err)
2528 break;
2529 }
2530 }
2531
2532 if (!write && !first && left && !err)
2533 err = proc_put_char(&buffer, &left, '\n');
2534 if (write && !err)
2535 left -= proc_skip_spaces(&kbuf);
2536 free:
2537 if (write) {
2538 free_page(page);
2539 if (first)
2540 return err ? : -EINVAL;
2541 }
2542 *lenp -= left;
2543 *ppos += *lenp;
2544 return err;
2545 }
2546
2547 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2548 void __user *buffer,
2549 size_t *lenp, loff_t *ppos,
2550 unsigned long convmul,
2551 unsigned long convdiv)
2552 {
2553 return __do_proc_doulongvec_minmax(table->data, table, write,
2554 buffer, lenp, ppos, convmul, convdiv);
2555 }
2556
2557 /**
2558 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2559 * @table: the sysctl table
2560 * @write: %TRUE if this is a write to the sysctl file
2561 * @buffer: the user buffer
2562 * @lenp: the size of the user buffer
2563 * @ppos: file position
2564 *
2565 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2566 * values from/to the user buffer, treated as an ASCII string.
2567 *
2568 * This routine will ensure the values are within the range specified by
2569 * table->extra1 (min) and table->extra2 (max).
2570 *
2571 * Returns 0 on success.
2572 */
2573 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2575 {
2576 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2577 }
2578
2579 /**
2580 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2581 * @table: the sysctl table
2582 * @write: %TRUE if this is a write to the sysctl file
2583 * @buffer: the user buffer
2584 * @lenp: the size of the user buffer
2585 * @ppos: file position
2586 *
2587 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2588 * values from/to the user buffer, treated as an ASCII string. The values
2589 * are treated as milliseconds, and converted to jiffies when they are stored.
2590 *
2591 * This routine will ensure the values are within the range specified by
2592 * table->extra1 (min) and table->extra2 (max).
2593 *
2594 * Returns 0 on success.
2595 */
2596 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2597 void __user *buffer,
2598 size_t *lenp, loff_t *ppos)
2599 {
2600 return do_proc_doulongvec_minmax(table, write, buffer,
2601 lenp, ppos, HZ, 1000l);
2602 }
2603
2604
2605 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2606 int *valp,
2607 int write, void *data)
2608 {
2609 if (write) {
2610 if (*lvalp > LONG_MAX / HZ)
2611 return 1;
2612 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2613 } else {
2614 int val = *valp;
2615 unsigned long lval;
2616 if (val < 0) {
2617 *negp = true;
2618 lval = (unsigned long)-val;
2619 } else {
2620 *negp = false;
2621 lval = (unsigned long)val;
2622 }
2623 *lvalp = lval / HZ;
2624 }
2625 return 0;
2626 }
2627
2628 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2629 int *valp,
2630 int write, void *data)
2631 {
2632 if (write) {
2633 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2634 return 1;
2635 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2636 } else {
2637 int val = *valp;
2638 unsigned long lval;
2639 if (val < 0) {
2640 *negp = true;
2641 lval = (unsigned long)-val;
2642 } else {
2643 *negp = false;
2644 lval = (unsigned long)val;
2645 }
2646 *lvalp = jiffies_to_clock_t(lval);
2647 }
2648 return 0;
2649 }
2650
2651 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2652 int *valp,
2653 int write, void *data)
2654 {
2655 if (write) {
2656 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2657 } else {
2658 int val = *valp;
2659 unsigned long lval;
2660 if (val < 0) {
2661 *negp = true;
2662 lval = (unsigned long)-val;
2663 } else {
2664 *negp = false;
2665 lval = (unsigned long)val;
2666 }
2667 *lvalp = jiffies_to_msecs(lval);
2668 }
2669 return 0;
2670 }
2671
2672 /**
2673 * proc_dointvec_jiffies - read a vector of integers as seconds
2674 * @table: the sysctl table
2675 * @write: %TRUE if this is a write to the sysctl file
2676 * @buffer: the user buffer
2677 * @lenp: the size of the user buffer
2678 * @ppos: file position
2679 *
2680 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2681 * values from/to the user buffer, treated as an ASCII string.
2682 * The values read are assumed to be in seconds, and are converted into
2683 * jiffies.
2684 *
2685 * Returns 0 on success.
2686 */
2687 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2688 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 {
2690 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2691 do_proc_dointvec_jiffies_conv,NULL);
2692 }
2693
2694 /**
2695 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2696 * @table: the sysctl table
2697 * @write: %TRUE if this is a write to the sysctl file
2698 * @buffer: the user buffer
2699 * @lenp: the size of the user buffer
2700 * @ppos: pointer to the file position
2701 *
2702 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2703 * values from/to the user buffer, treated as an ASCII string.
2704 * The values read are assumed to be in 1/USER_HZ seconds, and
2705 * are converted into jiffies.
2706 *
2707 * Returns 0 on success.
2708 */
2709 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2710 void __user *buffer, size_t *lenp, loff_t *ppos)
2711 {
2712 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2713 do_proc_dointvec_userhz_jiffies_conv,NULL);
2714 }
2715
2716 /**
2717 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2718 * @table: the sysctl table
2719 * @write: %TRUE if this is a write to the sysctl file
2720 * @buffer: the user buffer
2721 * @lenp: the size of the user buffer
2722 * @ppos: file position
2723 * @ppos: the current position in the file
2724 *
2725 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2726 * values from/to the user buffer, treated as an ASCII string.
2727 * The values read are assumed to be in 1/1000 seconds, and
2728 * are converted into jiffies.
2729 *
2730 * Returns 0 on success.
2731 */
2732 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2733 void __user *buffer, size_t *lenp, loff_t *ppos)
2734 {
2735 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2736 do_proc_dointvec_ms_jiffies_conv, NULL);
2737 }
2738
2739 static int proc_do_cad_pid(struct ctl_table *table, int write,
2740 void __user *buffer, size_t *lenp, loff_t *ppos)
2741 {
2742 struct pid *new_pid;
2743 pid_t tmp;
2744 int r;
2745
2746 tmp = pid_vnr(cad_pid);
2747
2748 r = __do_proc_dointvec(&tmp, table, write, buffer,
2749 lenp, ppos, NULL, NULL);
2750 if (r || !write)
2751 return r;
2752
2753 new_pid = find_get_pid(tmp);
2754 if (!new_pid)
2755 return -ESRCH;
2756
2757 put_pid(xchg(&cad_pid, new_pid));
2758 return 0;
2759 }
2760
2761 /**
2762 * proc_do_large_bitmap - read/write from/to a large bitmap
2763 * @table: the sysctl table
2764 * @write: %TRUE if this is a write to the sysctl file
2765 * @buffer: the user buffer
2766 * @lenp: the size of the user buffer
2767 * @ppos: file position
2768 *
2769 * The bitmap is stored at table->data and the bitmap length (in bits)
2770 * in table->maxlen.
2771 *
2772 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2773 * large bitmaps may be represented in a compact manner. Writing into
2774 * the file will clear the bitmap then update it with the given input.
2775 *
2776 * Returns 0 on success.
2777 */
2778 int proc_do_large_bitmap(struct ctl_table *table, int write,
2779 void __user *buffer, size_t *lenp, loff_t *ppos)
2780 {
2781 int err = 0;
2782 bool first = 1;
2783 size_t left = *lenp;
2784 unsigned long bitmap_len = table->maxlen;
2785 unsigned long *bitmap = (unsigned long *) table->data;
2786 unsigned long *tmp_bitmap = NULL;
2787 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2788
2789 if (!bitmap_len || !left || (*ppos && !write)) {
2790 *lenp = 0;
2791 return 0;
2792 }
2793
2794 if (write) {
2795 unsigned long page = 0;
2796 char *kbuf;
2797
2798 if (left > PAGE_SIZE - 1)
2799 left = PAGE_SIZE - 1;
2800
2801 page = __get_free_page(GFP_TEMPORARY);
2802 kbuf = (char *) page;
2803 if (!kbuf)
2804 return -ENOMEM;
2805 if (copy_from_user(kbuf, buffer, left)) {
2806 free_page(page);
2807 return -EFAULT;
2808 }
2809 kbuf[left] = 0;
2810
2811 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2812 GFP_KERNEL);
2813 if (!tmp_bitmap) {
2814 free_page(page);
2815 return -ENOMEM;
2816 }
2817 proc_skip_char(&kbuf, &left, '\n');
2818 while (!err && left) {
2819 unsigned long val_a, val_b;
2820 bool neg;
2821
2822 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2823 sizeof(tr_a), &c);
2824 if (err)
2825 break;
2826 if (val_a >= bitmap_len || neg) {
2827 err = -EINVAL;
2828 break;
2829 }
2830
2831 val_b = val_a;
2832 if (left) {
2833 kbuf++;
2834 left--;
2835 }
2836
2837 if (c == '-') {
2838 err = proc_get_long(&kbuf, &left, &val_b,
2839 &neg, tr_b, sizeof(tr_b),
2840 &c);
2841 if (err)
2842 break;
2843 if (val_b >= bitmap_len || neg ||
2844 val_a > val_b) {
2845 err = -EINVAL;
2846 break;
2847 }
2848 if (left) {
2849 kbuf++;
2850 left--;
2851 }
2852 }
2853
2854 while (val_a <= val_b)
2855 set_bit(val_a++, tmp_bitmap);
2856
2857 first = 0;
2858 proc_skip_char(&kbuf, &left, '\n');
2859 }
2860 free_page(page);
2861 } else {
2862 unsigned long bit_a, bit_b = 0;
2863
2864 while (left) {
2865 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2866 if (bit_a >= bitmap_len)
2867 break;
2868 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2869 bit_a + 1) - 1;
2870
2871 if (!first) {
2872 err = proc_put_char(&buffer, &left, ',');
2873 if (err)
2874 break;
2875 }
2876 err = proc_put_long(&buffer, &left, bit_a, false);
2877 if (err)
2878 break;
2879 if (bit_a != bit_b) {
2880 err = proc_put_char(&buffer, &left, '-');
2881 if (err)
2882 break;
2883 err = proc_put_long(&buffer, &left, bit_b, false);
2884 if (err)
2885 break;
2886 }
2887
2888 first = 0; bit_b++;
2889 }
2890 if (!err)
2891 err = proc_put_char(&buffer, &left, '\n');
2892 }
2893
2894 if (!err) {
2895 if (write) {
2896 if (*ppos)
2897 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2898 else
2899 memcpy(bitmap, tmp_bitmap,
2900 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2901 }
2902 kfree(tmp_bitmap);
2903 *lenp -= left;
2904 *ppos += *lenp;
2905 return 0;
2906 } else {
2907 kfree(tmp_bitmap);
2908 return err;
2909 }
2910 }
2911
2912 #else /* CONFIG_PROC_FS */
2913
2914 int proc_dostring(struct ctl_table *table, int write,
2915 void __user *buffer, size_t *lenp, loff_t *ppos)
2916 {
2917 return -ENOSYS;
2918 }
2919
2920 int proc_dointvec(struct ctl_table *table, int write,
2921 void __user *buffer, size_t *lenp, loff_t *ppos)
2922 {
2923 return -ENOSYS;
2924 }
2925
2926 int proc_dointvec_minmax(struct ctl_table *table, int write,
2927 void __user *buffer, size_t *lenp, loff_t *ppos)
2928 {
2929 return -ENOSYS;
2930 }
2931
2932 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2933 void __user *buffer, size_t *lenp, loff_t *ppos)
2934 {
2935 return -ENOSYS;
2936 }
2937
2938 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2939 void __user *buffer, size_t *lenp, loff_t *ppos)
2940 {
2941 return -ENOSYS;
2942 }
2943
2944 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2945 void __user *buffer, size_t *lenp, loff_t *ppos)
2946 {
2947 return -ENOSYS;
2948 }
2949
2950 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2951 void __user *buffer, size_t *lenp, loff_t *ppos)
2952 {
2953 return -ENOSYS;
2954 }
2955
2956 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2957 void __user *buffer,
2958 size_t *lenp, loff_t *ppos)
2959 {
2960 return -ENOSYS;
2961 }
2962
2963
2964 #endif /* CONFIG_PROC_FS */
2965
2966 /*
2967 * No sense putting this after each symbol definition, twice,
2968 * exception granted :-)
2969 */
2970 EXPORT_SYMBOL(proc_dointvec);
2971 EXPORT_SYMBOL(proc_dointvec_jiffies);
2972 EXPORT_SYMBOL(proc_dointvec_minmax);
2973 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2974 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2975 EXPORT_SYMBOL(proc_dostring);
2976 EXPORT_SYMBOL(proc_doulongvec_minmax);
2977 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2978 EXPORT_SYMBOL(register_sysctl_table);
2979 EXPORT_SYMBOL(register_sysctl_paths);
2980 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree