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Add linux-next specific files for 20110516
[linux-2.6/next.git] / kernel / sysctl.c
blob965134bed6cd8d39e4b279bc6bb713b65e59cfae
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 #include <linux/kmod.h>
60
61 #include <asm/uaccess.h>
62 #include <asm/processor.h>
63
64 #ifdef CONFIG_X86
65 #include <asm/nmi.h>
66 #include <asm/stacktrace.h>
67 #include <asm/io.h>
68 #endif
69 #ifdef CONFIG_BSD_PROCESS_ACCT
70 #include <linux/acct.h>
71 #endif
72 #ifdef CONFIG_RT_MUTEXES
73 #include <linux/rtmutex.h>
74 #endif
75 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
76 #include <linux/lockdep.h>
77 #endif
78 #ifdef CONFIG_CHR_DEV_SG
79 #include <scsi/sg.h>
80 #endif
81
82 #ifdef CONFIG_LOCKUP_DETECTOR
83 #include <linux/nmi.h>
84 #endif
85
86
87 #if defined(CONFIG_SYSCTL)
88
89 /* External variables not in a header file. */
90 extern int sysctl_overcommit_memory;
91 extern int sysctl_overcommit_ratio;
92 extern int max_threads;
93 extern int core_uses_pid;
94 extern int suid_dumpable;
95 extern char core_pattern[];
96 extern unsigned int core_pipe_limit;
97 extern int pid_max;
98 extern int min_free_kbytes;
99 extern int pid_max_min, pid_max_max;
100 extern int sysctl_drop_caches;
101 extern int percpu_pagelist_fraction;
102 extern int compat_log;
103 extern int latencytop_enabled;
104 extern int sysctl_nr_open_min, sysctl_nr_open_max;
105 #ifndef CONFIG_MMU
106 extern int sysctl_nr_trim_pages;
107 #endif
108 #ifdef CONFIG_BLOCK
109 extern int blk_iopoll_enabled;
110 #endif
111
112 /* Constants used for minimum and maximum */
113 #ifdef CONFIG_LOCKUP_DETECTOR
114 static int sixty = 60;
115 static int neg_one = -1;
116 #endif
117
118 static int zero;
119 static int __maybe_unused one = 1;
120 static int __maybe_unused two = 2;
121 static int __maybe_unused three = 3;
122 static unsigned long one_ul = 1;
123 static int one_hundred = 100;
124 #ifdef CONFIG_PRINTK
125 static int ten_thousand = 10000;
126 #endif
127
128 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
129 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
130
131 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
132 static int maxolduid = 65535;
133 static int minolduid;
134 static int min_percpu_pagelist_fract = 8;
135
136 static int ngroups_max = NGROUPS_MAX;
137
138 #ifdef CONFIG_INOTIFY_USER
139 #include <linux/inotify.h>
140 #endif
141 #ifdef CONFIG_SPARC
142 #include <asm/system.h>
143 #endif
144
145 #ifdef CONFIG_SPARC64
146 extern int sysctl_tsb_ratio;
147 #endif
148
149 #ifdef __hppa__
150 extern int pwrsw_enabled;
151 extern int unaligned_enabled;
152 #endif
153
154 #ifdef CONFIG_S390
155 #ifdef CONFIG_MATHEMU
156 extern int sysctl_ieee_emulation_warnings;
157 #endif
158 extern int sysctl_userprocess_debug;
159 extern int spin_retry;
160 #endif
161
162 #ifdef CONFIG_IA64
163 extern int no_unaligned_warning;
164 extern int unaligned_dump_stack;
165 #endif
166
167 #ifdef CONFIG_PROC_SYSCTL
168 static int proc_do_cad_pid(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170 static int proc_taint(struct ctl_table *table, int write,
171 void __user *buffer, size_t *lenp, loff_t *ppos);
172 #endif
173
174 #ifdef CONFIG_PRINTK
175 static int proc_dmesg_restrict(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177 #endif
178
179 #ifdef CONFIG_MAGIC_SYSRQ
180 /* Note: sysrq code uses it's own private copy */
181 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
182
183 static int sysrq_sysctl_handler(ctl_table *table, int write,
184 void __user *buffer, size_t *lenp,
185 loff_t *ppos)
186 {
187 int error;
188
189 error = proc_dointvec(table, write, buffer, lenp, ppos);
190 if (error)
191 return error;
192
193 if (write)
194 sysrq_toggle_support(__sysrq_enabled);
195
196 return 0;
197 }
198
199 #endif
200
201 static struct ctl_table root_table[];
202 static struct ctl_table_root sysctl_table_root;
203 static struct ctl_table_header root_table_header = {
204 {{.count = 1,
205 .ctl_table = root_table,
206 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
207 .root = &sysctl_table_root,
208 .set = &sysctl_table_root.default_set,
209 };
210 static struct ctl_table_root sysctl_table_root = {
211 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
212 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
213 };
214
215 static struct ctl_table kern_table[];
216 static struct ctl_table vm_table[];
217 static struct ctl_table fs_table[];
218 static struct ctl_table debug_table[];
219 static struct ctl_table dev_table[];
220 extern struct ctl_table random_table[];
221 #ifdef CONFIG_EPOLL
222 extern struct ctl_table epoll_table[];
223 #endif
224
225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
226 int sysctl_legacy_va_layout;
227 #endif
228
229 /* The default sysctl tables: */
230
231 static struct ctl_table root_table[] = {
232 {
233 .procname = "kernel",
234 .mode = 0555,
235 .child = kern_table,
236 },
237 {
238 .procname = "vm",
239 .mode = 0555,
240 .child = vm_table,
241 },
242 {
243 .procname = "fs",
244 .mode = 0555,
245 .child = fs_table,
246 },
247 {
248 .procname = "debug",
249 .mode = 0555,
250 .child = debug_table,
251 },
252 {
253 .procname = "dev",
254 .mode = 0555,
255 .child = dev_table,
256 },
257 { }
258 };
259
260 #ifdef CONFIG_SCHED_DEBUG
261 static int min_sched_granularity_ns = 100000; /* 100 usecs */
262 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
263 static int min_wakeup_granularity_ns; /* 0 usecs */
264 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
267 #endif
268
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold;
271 static int max_extfrag_threshold = 1000;
272 #endif
273
274 static struct ctl_table kern_table[] = {
275 {
276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
280 .proc_handler = proc_dointvec,
281 },
282 #ifdef CONFIG_SCHED_DEBUG
283 {
284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
291 },
292 {
293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
300 },
301 {
302 .procname = "sched_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
309 },
310 {
311 .procname = "sched_tunable_scaling",
312 .data = &sysctl_sched_tunable_scaling,
313 .maxlen = sizeof(enum sched_tunable_scaling),
314 .mode = 0644,
315 .proc_handler = sched_proc_update_handler,
316 .extra1 = &min_sched_tunable_scaling,
317 .extra2 = &max_sched_tunable_scaling,
318 },
319 {
320 .procname = "sched_migration_cost",
321 .data = &sysctl_sched_migration_cost,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec,
325 },
326 {
327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_time_avg",
335 .data = &sysctl_sched_time_avg,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_shares_window",
342 .data = &sysctl_sched_shares_window,
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 #ifdef CONFIG_SCHED_AUTOGROUP
372 {
373 .procname = "sched_autogroup_enabled",
374 .data = &sysctl_sched_autogroup_enabled,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec_minmax,
378 .extra1 = &zero,
379 .extra2 = &one,
380 },
381 #endif
382 #ifdef CONFIG_PROVE_LOCKING
383 {
384 .procname = "prove_locking",
385 .data = &prove_locking,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec,
389 },
390 #endif
391 #ifdef CONFIG_LOCK_STAT
392 {
393 .procname = "lock_stat",
394 .data = &lock_stat,
395 .maxlen = sizeof(int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 #endif
400 {
401 .procname = "panic",
402 .data = &panic_timeout,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "core_uses_pid",
409 .data = &core_uses_pid,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec,
413 },
414 {
415 .procname = "core_pattern",
416 .data = core_pattern,
417 .maxlen = CORENAME_MAX_SIZE,
418 .mode = 0644,
419 .proc_handler = proc_dostring,
420 },
421 {
422 .procname = "core_pipe_limit",
423 .data = &core_pipe_limit,
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
426 .proc_handler = proc_dointvec,
427 },
428 #ifdef CONFIG_PROC_SYSCTL
429 {
430 .procname = "tainted",
431 .maxlen = sizeof(long),
432 .mode = 0644,
433 .proc_handler = proc_taint,
434 },
435 #endif
436 #ifdef CONFIG_LATENCYTOP
437 {
438 .procname = "latencytop",
439 .data = &latencytop_enabled,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 #ifdef CONFIG_BLK_DEV_INITRD
446 {
447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 {
455 .procname = "print-fatal-signals",
456 .data = &print_fatal_signals,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #ifdef CONFIG_SPARC
462 {
463 .procname = "reboot-cmd",
464 .data = reboot_command,
465 .maxlen = 256,
466 .mode = 0644,
467 .proc_handler = proc_dostring,
468 },
469 {
470 .procname = "stop-a",
471 .data = &stop_a_enabled,
472 .maxlen = sizeof (int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec,
475 },
476 {
477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_SPARC64
485 {
486 .procname = "tsb-ratio",
487 .data = &sysctl_tsb_ratio,
488 .maxlen = sizeof (int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif
493 #ifdef __hppa__
494 {
495 .procname = "soft-power",
496 .data = &pwrsw_enabled,
497 .maxlen = sizeof (int),
498 .mode = 0644,
499 .proc_handler = proc_dointvec,
500 },
501 {
502 .procname = "unaligned-trap",
503 .data = &unaligned_enabled,
504 .maxlen = sizeof (int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 #endif
509 {
510 .procname = "ctrl-alt-del",
511 .data = &C_A_D,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec,
515 },
516 #ifdef CONFIG_FUNCTION_TRACER
517 {
518 .procname = "ftrace_enabled",
519 .data = &ftrace_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = ftrace_enable_sysctl,
523 },
524 #endif
525 #ifdef CONFIG_STACK_TRACER
526 {
527 .procname = "stack_tracer_enabled",
528 .data = &stack_tracer_enabled,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = stack_trace_sysctl,
532 },
533 #endif
534 #ifdef CONFIG_TRACING
535 {
536 .procname = "ftrace_dump_on_oops",
537 .data = &ftrace_dump_on_oops,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #endif
543 #ifdef CONFIG_MODULES
544 {
545 .procname = "modprobe",
546 .data = &modprobe_path,
547 .maxlen = KMOD_PATH_LEN,
548 .mode = 0644,
549 .proc_handler = proc_dostring,
550 },
551 {
552 .procname = "modules_disabled",
553 .data = &modules_disabled,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 /* only handle a transition from default "0" to "1" */
557 .proc_handler = proc_dointvec_minmax,
558 .extra1 = &one,
559 .extra2 = &one,
560 },
561 #endif
562 #ifdef CONFIG_HOTPLUG
563 {
564 .procname = "hotplug",
565 .data = &uevent_helper,
566 .maxlen = UEVENT_HELPER_PATH_LEN,
567 .mode = 0644,
568 .proc_handler = proc_dostring,
569 },
570 #endif
571 #ifdef CONFIG_CHR_DEV_SG
572 {
573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
576 .mode = 0444,
577 .proc_handler = proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_BSD_PROCESS_ACCT
581 {
582 .procname = "acct",
583 .data = &acct_parm,
584 .maxlen = 3*sizeof(int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec,
587 },
588 #endif
589 #ifdef CONFIG_MAGIC_SYSRQ
590 {
591 .procname = "sysrq",
592 .data = &__sysrq_enabled,
593 .maxlen = sizeof (int),
594 .mode = 0644,
595 .proc_handler = sysrq_sysctl_handler,
596 },
597 #endif
598 #ifdef CONFIG_PROC_SYSCTL
599 {
600 .procname = "cad_pid",
601 .data = NULL,
602 .maxlen = sizeof (int),
603 .mode = 0600,
604 .proc_handler = proc_do_cad_pid,
605 },
606 #endif
607 {
608 .procname = "threads-max",
609 .data = &max_threads,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 {
615 .procname = "random",
616 .mode = 0555,
617 .child = random_table,
618 },
619 {
620 .procname = "usermodehelper",
621 .mode = 0555,
622 .child = usermodehelper_table,
623 },
624 {
625 .procname = "overflowuid",
626 .data = &overflowuid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
633 {
634 .procname = "overflowgid",
635 .data = &overflowgid,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec_minmax,
639 .extra1 = &minolduid,
640 .extra2 = &maxolduid,
641 },
642 #ifdef CONFIG_S390
643 #ifdef CONFIG_MATHEMU
644 {
645 .procname = "ieee_emulation_warnings",
646 .data = &sysctl_ieee_emulation_warnings,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 .proc_handler = proc_dointvec,
650 },
651 #endif
652 {
653 .procname = "userprocess_debug",
654 .data = &show_unhandled_signals,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec,
658 },
659 #endif
660 {
661 .procname = "pid_max",
662 .data = &pid_max,
663 .maxlen = sizeof (int),
664 .mode = 0644,
665 .proc_handler = proc_dointvec_minmax,
666 .extra1 = &pid_max_min,
667 .extra2 = &pid_max_max,
668 },
669 {
670 .procname = "panic_on_oops",
671 .data = &panic_on_oops,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec,
675 },
676 #if defined CONFIG_PRINTK
677 {
678 .procname = "printk",
679 .data = &console_loglevel,
680 .maxlen = 4*sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec,
683 },
684 {
685 .procname = "printk_ratelimit",
686 .data = &printk_ratelimit_state.interval,
687 .maxlen = sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec_jiffies,
690 },
691 {
692 .procname = "printk_ratelimit_burst",
693 .data = &printk_ratelimit_state.burst,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec,
697 },
698 {
699 .procname = "printk_delay",
700 .data = &printk_delay_msec,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec_minmax,
704 .extra1 = &zero,
705 .extra2 = &ten_thousand,
706 },
707 {
708 .procname = "dmesg_restrict",
709 .data = &dmesg_restrict,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &zero,
714 .extra2 = &one,
715 },
716 {
717 .procname = "kptr_restrict",
718 .data = &kptr_restrict,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = proc_dmesg_restrict,
722 .extra1 = &zero,
723 .extra2 = &two,
724 },
725 #endif
726 {
727 .procname = "ngroups_max",
728 .data = &ngroups_max,
729 .maxlen = sizeof (int),
730 .mode = 0444,
731 .proc_handler = proc_dointvec,
732 },
733 #if defined(CONFIG_LOCKUP_DETECTOR)
734 {
735 .procname = "watchdog",
736 .data = &watchdog_enabled,
737 .maxlen = sizeof (int),
738 .mode = 0644,
739 .proc_handler = proc_dowatchdog_enabled,
740 },
741 {
742 .procname = "watchdog_thresh",
743 .data = &softlockup_thresh,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dowatchdog_thresh,
747 .extra1 = &neg_one,
748 .extra2 = &sixty,
749 },
750 {
751 .procname = "softlockup_panic",
752 .data = &softlockup_panic,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &zero,
757 .extra2 = &one,
758 },
759 {
760 .procname = "nmi_watchdog",
761 .data = &watchdog_enabled,
762 .maxlen = sizeof (int),
763 .mode = 0644,
764 .proc_handler = proc_dowatchdog_enabled,
765 },
766 #endif
767 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
768 {
769 .procname = "unknown_nmi_panic",
770 .data = &unknown_nmi_panic,
771 .maxlen = sizeof (int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec,
774 },
775 #endif
776 #if defined(CONFIG_X86)
777 {
778 .procname = "panic_on_unrecovered_nmi",
779 .data = &panic_on_unrecovered_nmi,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec,
783 },
784 {
785 .procname = "panic_on_io_nmi",
786 .data = &panic_on_io_nmi,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec,
790 },
791 {
792 .procname = "bootloader_type",
793 .data = &bootloader_type,
794 .maxlen = sizeof (int),
795 .mode = 0444,
796 .proc_handler = proc_dointvec,
797 },
798 {
799 .procname = "bootloader_version",
800 .data = &bootloader_version,
801 .maxlen = sizeof (int),
802 .mode = 0444,
803 .proc_handler = proc_dointvec,
804 },
805 {
806 .procname = "kstack_depth_to_print",
807 .data = &kstack_depth_to_print,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec,
811 },
812 {
813 .procname = "io_delay_type",
814 .data = &io_delay_type,
815 .maxlen = sizeof(int),
816 .mode = 0644,
817 .proc_handler = proc_dointvec,
818 },
819 #endif
820 #if defined(CONFIG_MMU)
821 {
822 .procname = "randomize_va_space",
823 .data = &randomize_va_space,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = proc_dointvec,
827 },
828 #endif
829 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
830 {
831 .procname = "spin_retry",
832 .data = &spin_retry,
833 .maxlen = sizeof (int),
834 .mode = 0644,
835 .proc_handler = proc_dointvec,
836 },
837 #endif
838 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
839 {
840 .procname = "acpi_video_flags",
841 .data = &acpi_realmode_flags,
842 .maxlen = sizeof (unsigned long),
843 .mode = 0644,
844 .proc_handler = proc_doulongvec_minmax,
845 },
846 #endif
847 #ifdef CONFIG_IA64
848 {
849 .procname = "ignore-unaligned-usertrap",
850 .data = &no_unaligned_warning,
851 .maxlen = sizeof (int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec,
854 },
855 {
856 .procname = "unaligned-dump-stack",
857 .data = &unaligned_dump_stack,
858 .maxlen = sizeof (int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec,
861 },
862 #endif
863 #ifdef CONFIG_DETECT_HUNG_TASK
864 {
865 .procname = "hung_task_panic",
866 .data = &sysctl_hung_task_panic,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec_minmax,
870 .extra1 = &zero,
871 .extra2 = &one,
872 },
873 {
874 .procname = "hung_task_check_count",
875 .data = &sysctl_hung_task_check_count,
876 .maxlen = sizeof(unsigned long),
877 .mode = 0644,
878 .proc_handler = proc_doulongvec_minmax,
879 },
880 {
881 .procname = "hung_task_timeout_secs",
882 .data = &sysctl_hung_task_timeout_secs,
883 .maxlen = sizeof(unsigned long),
884 .mode = 0644,
885 .proc_handler = proc_dohung_task_timeout_secs,
886 },
887 {
888 .procname = "hung_task_warnings",
889 .data = &sysctl_hung_task_warnings,
890 .maxlen = sizeof(unsigned long),
891 .mode = 0644,
892 .proc_handler = proc_doulongvec_minmax,
893 },
894 #endif
895 #ifdef CONFIG_COMPAT
896 {
897 .procname = "compat-log",
898 .data = &compat_log,
899 .maxlen = sizeof (int),
900 .mode = 0644,
901 .proc_handler = proc_dointvec,
902 },
903 #endif
904 #ifdef CONFIG_RT_MUTEXES
905 {
906 .procname = "max_lock_depth",
907 .data = &max_lock_depth,
908 .maxlen = sizeof(int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec,
911 },
912 #endif
913 {
914 .procname = "poweroff_cmd",
915 .data = &poweroff_cmd,
916 .maxlen = POWEROFF_CMD_PATH_LEN,
917 .mode = 0644,
918 .proc_handler = proc_dostring,
919 },
920 #ifdef CONFIG_KEYS
921 {
922 .procname = "keys",
923 .mode = 0555,
924 .child = key_sysctls,
925 },
926 #endif
927 #ifdef CONFIG_RCU_TORTURE_TEST
928 {
929 .procname = "rcutorture_runnable",
930 .data = &rcutorture_runnable,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec,
934 },
935 #endif
936 #ifdef CONFIG_PERF_EVENTS
937 {
938 .procname = "perf_event_paranoid",
939 .data = &sysctl_perf_event_paranoid,
940 .maxlen = sizeof(sysctl_perf_event_paranoid),
941 .mode = 0644,
942 .proc_handler = proc_dointvec,
943 },
944 {
945 .procname = "perf_event_mlock_kb",
946 .data = &sysctl_perf_event_mlock,
947 .maxlen = sizeof(sysctl_perf_event_mlock),
948 .mode = 0644,
949 .proc_handler = proc_dointvec,
950 },
951 {
952 .procname = "perf_event_max_sample_rate",
953 .data = &sysctl_perf_event_sample_rate,
954 .maxlen = sizeof(sysctl_perf_event_sample_rate),
955 .mode = 0644,
956 .proc_handler = perf_proc_update_handler,
957 },
958 #endif
959 #ifdef CONFIG_KMEMCHECK
960 {
961 .procname = "kmemcheck",
962 .data = &kmemcheck_enabled,
963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec,
966 },
967 #endif
968 #ifdef CONFIG_BLOCK
969 {
970 .procname = "blk_iopoll",
971 .data = &blk_iopoll_enabled,
972 .maxlen = sizeof(int),
973 .mode = 0644,
974 .proc_handler = proc_dointvec,
975 },
976 #endif
977 { }
978 };
979
980 static struct ctl_table vm_table[] = {
981 {
982 .procname = "overcommit_memory",
983 .data = &sysctl_overcommit_memory,
984 .maxlen = sizeof(sysctl_overcommit_memory),
985 .mode = 0644,
986 .proc_handler = proc_dointvec_minmax,
987 .extra1 = &zero,
988 .extra2 = &two,
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_minmax,
996 .extra1 = &zero,
997 .extra2 = &two,
998 },
999 {
1000 .procname = "oom_kill_allocating_task",
1001 .data = &sysctl_oom_kill_allocating_task,
1002 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1003 .mode = 0644,
1004 .proc_handler = proc_dointvec,
1005 },
1006 {
1007 .procname = "oom_dump_tasks",
1008 .data = &sysctl_oom_dump_tasks,
1009 .maxlen = sizeof(sysctl_oom_dump_tasks),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec,
1012 },
1013 {
1014 .procname = "overcommit_ratio",
1015 .data = &sysctl_overcommit_ratio,
1016 .maxlen = sizeof(sysctl_overcommit_ratio),
1017 .mode = 0644,
1018 .proc_handler = proc_dointvec,
1019 },
1020 {
1021 .procname = "page-cluster",
1022 .data = &page_cluster,
1023 .maxlen = sizeof(int),
1024 .mode = 0644,
1025 .proc_handler = proc_dointvec_minmax,
1026 .extra1 = &zero,
1027 },
1028 {
1029 .procname = "dirty_background_ratio",
1030 .data = &dirty_background_ratio,
1031 .maxlen = sizeof(dirty_background_ratio),
1032 .mode = 0644,
1033 .proc_handler = dirty_background_ratio_handler,
1034 .extra1 = &zero,
1035 .extra2 = &one_hundred,
1036 },
1037 {
1038 .procname = "dirty_background_bytes",
1039 .data = &dirty_background_bytes,
1040 .maxlen = sizeof(dirty_background_bytes),
1041 .mode = 0644,
1042 .proc_handler = dirty_background_bytes_handler,
1043 .extra1 = &one_ul,
1044 },
1045 {
1046 .procname = "dirty_ratio",
1047 .data = &vm_dirty_ratio,
1048 .maxlen = sizeof(vm_dirty_ratio),
1049 .mode = 0644,
1050 .proc_handler = dirty_ratio_handler,
1051 .extra1 = &zero,
1052 .extra2 = &one_hundred,
1053 },
1054 {
1055 .procname = "dirty_bytes",
1056 .data = &vm_dirty_bytes,
1057 .maxlen = sizeof(vm_dirty_bytes),
1058 .mode = 0644,
1059 .proc_handler = dirty_bytes_handler,
1060 .extra1 = &dirty_bytes_min,
1061 },
1062 {
1063 .procname = "dirty_writeback_centisecs",
1064 .data = &dirty_writeback_interval,
1065 .maxlen = sizeof(dirty_writeback_interval),
1066 .mode = 0644,
1067 .proc_handler = dirty_writeback_centisecs_handler,
1068 },
1069 {
1070 .procname = "dirty_expire_centisecs",
1071 .data = &dirty_expire_interval,
1072 .maxlen = sizeof(dirty_expire_interval),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec_minmax,
1075 .extra1 = &zero,
1076 },
1077 {
1078 .procname = "nr_pdflush_threads",
1079 .data = &nr_pdflush_threads,
1080 .maxlen = sizeof nr_pdflush_threads,
1081 .mode = 0444 /* read-only*/,
1082 .proc_handler = proc_dointvec,
1083 },
1084 {
1085 .procname = "swappiness",
1086 .data = &vm_swappiness,
1087 .maxlen = sizeof(vm_swappiness),
1088 .mode = 0644,
1089 .proc_handler = proc_dointvec_minmax,
1090 .extra1 = &zero,
1091 .extra2 = &one_hundred,
1092 },
1093 #ifdef CONFIG_HUGETLB_PAGE
1094 {
1095 .procname = "nr_hugepages",
1096 .data = NULL,
1097 .maxlen = sizeof(unsigned long),
1098 .mode = 0644,
1099 .proc_handler = hugetlb_sysctl_handler,
1100 .extra1 = (void *)&hugetlb_zero,
1101 .extra2 = (void *)&hugetlb_infinity,
1102 },
1103 #ifdef CONFIG_NUMA
1104 {
1105 .procname = "nr_hugepages_mempolicy",
1106 .data = NULL,
1107 .maxlen = sizeof(unsigned long),
1108 .mode = 0644,
1109 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1110 .extra1 = (void *)&hugetlb_zero,
1111 .extra2 = (void *)&hugetlb_infinity,
1112 },
1113 #endif
1114 {
1115 .procname = "hugetlb_shm_group",
1116 .data = &sysctl_hugetlb_shm_group,
1117 .maxlen = sizeof(gid_t),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec,
1120 },
1121 {
1122 .procname = "hugepages_treat_as_movable",
1123 .data = &hugepages_treat_as_movable,
1124 .maxlen = sizeof(int),
1125 .mode = 0644,
1126 .proc_handler = hugetlb_treat_movable_handler,
1127 },
1128 {
1129 .procname = "nr_overcommit_hugepages",
1130 .data = NULL,
1131 .maxlen = sizeof(unsigned long),
1132 .mode = 0644,
1133 .proc_handler = hugetlb_overcommit_handler,
1134 .extra1 = (void *)&hugetlb_zero,
1135 .extra2 = (void *)&hugetlb_infinity,
1136 },
1137 #endif
1138 {
1139 .procname = "lowmem_reserve_ratio",
1140 .data = &sysctl_lowmem_reserve_ratio,
1141 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1142 .mode = 0644,
1143 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1144 },
1145 {
1146 .procname = "drop_caches",
1147 .data = &sysctl_drop_caches,
1148 .maxlen = sizeof(int),
1149 .mode = 0644,
1150 .proc_handler = drop_caches_sysctl_handler,
1151 .extra1 = &one,
1152 .extra2 = &three,
1153 },
1154 #ifdef CONFIG_COMPACTION
1155 {
1156 .procname = "compact_memory",
1157 .data = &sysctl_compact_memory,
1158 .maxlen = sizeof(int),
1159 .mode = 0200,
1160 .proc_handler = sysctl_compaction_handler,
1161 },
1162 {
1163 .procname = "extfrag_threshold",
1164 .data = &sysctl_extfrag_threshold,
1165 .maxlen = sizeof(int),
1166 .mode = 0644,
1167 .proc_handler = sysctl_extfrag_handler,
1168 .extra1 = &min_extfrag_threshold,
1169 .extra2 = &max_extfrag_threshold,
1170 },
1171
1172 #endif /* CONFIG_COMPACTION */
1173 {
1174 .procname = "min_free_kbytes",
1175 .data = &min_free_kbytes,
1176 .maxlen = sizeof(min_free_kbytes),
1177 .mode = 0644,
1178 .proc_handler = min_free_kbytes_sysctl_handler,
1179 .extra1 = &zero,
1180 },
1181 {
1182 .procname = "percpu_pagelist_fraction",
1183 .data = &percpu_pagelist_fraction,
1184 .maxlen = sizeof(percpu_pagelist_fraction),
1185 .mode = 0644,
1186 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1187 .extra1 = &min_percpu_pagelist_fract,
1188 },
1189 #ifdef CONFIG_MMU
1190 {
1191 .procname = "max_map_count",
1192 .data = &sysctl_max_map_count,
1193 .maxlen = sizeof(sysctl_max_map_count),
1194 .mode = 0644,
1195 .proc_handler = proc_dointvec_minmax,
1196 .extra1 = &zero,
1197 },
1198 #else
1199 {
1200 .procname = "nr_trim_pages",
1201 .data = &sysctl_nr_trim_pages,
1202 .maxlen = sizeof(sysctl_nr_trim_pages),
1203 .mode = 0644,
1204 .proc_handler = proc_dointvec_minmax,
1205 .extra1 = &zero,
1206 },
1207 #endif
1208 {
1209 .procname = "laptop_mode",
1210 .data = &laptop_mode,
1211 .maxlen = sizeof(laptop_mode),
1212 .mode = 0644,
1213 .proc_handler = proc_dointvec_jiffies,
1214 },
1215 {
1216 .procname = "block_dump",
1217 .data = &block_dump,
1218 .maxlen = sizeof(block_dump),
1219 .mode = 0644,
1220 .proc_handler = proc_dointvec,
1221 .extra1 = &zero,
1222 },
1223 {
1224 .procname = "vfs_cache_pressure",
1225 .data = &sysctl_vfs_cache_pressure,
1226 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1227 .mode = 0644,
1228 .proc_handler = proc_dointvec,
1229 .extra1 = &zero,
1230 },
1231 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1232 {
1233 .procname = "legacy_va_layout",
1234 .data = &sysctl_legacy_va_layout,
1235 .maxlen = sizeof(sysctl_legacy_va_layout),
1236 .mode = 0644,
1237 .proc_handler = proc_dointvec,
1238 .extra1 = &zero,
1239 },
1240 #endif
1241 #ifdef CONFIG_NUMA
1242 {
1243 .procname = "zone_reclaim_mode",
1244 .data = &zone_reclaim_mode,
1245 .maxlen = sizeof(zone_reclaim_mode),
1246 .mode = 0644,
1247 .proc_handler = proc_dointvec,
1248 .extra1 = &zero,
1249 },
1250 {
1251 .procname = "min_unmapped_ratio",
1252 .data = &sysctl_min_unmapped_ratio,
1253 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1254 .mode = 0644,
1255 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1256 .extra1 = &zero,
1257 .extra2 = &one_hundred,
1258 },
1259 {
1260 .procname = "min_slab_ratio",
1261 .data = &sysctl_min_slab_ratio,
1262 .maxlen = sizeof(sysctl_min_slab_ratio),
1263 .mode = 0644,
1264 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1265 .extra1 = &zero,
1266 .extra2 = &one_hundred,
1267 },
1268 #endif
1269 #ifdef CONFIG_SMP
1270 {
1271 .procname = "stat_interval",
1272 .data = &sysctl_stat_interval,
1273 .maxlen = sizeof(sysctl_stat_interval),
1274 .mode = 0644,
1275 .proc_handler = proc_dointvec_jiffies,
1276 },
1277 #endif
1278 #ifdef CONFIG_MMU
1279 {
1280 .procname = "mmap_min_addr",
1281 .data = &dac_mmap_min_addr,
1282 .maxlen = sizeof(unsigned long),
1283 .mode = 0644,
1284 .proc_handler = mmap_min_addr_handler,
1285 },
1286 #endif
1287 #ifdef CONFIG_NUMA
1288 {
1289 .procname = "numa_zonelist_order",
1290 .data = &numa_zonelist_order,
1291 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1292 .mode = 0644,
1293 .proc_handler = numa_zonelist_order_handler,
1294 },
1295 #endif
1296 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1297 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1298 {
1299 .procname = "vdso_enabled",
1300 .data = &vdso_enabled,
1301 .maxlen = sizeof(vdso_enabled),
1302 .mode = 0644,
1303 .proc_handler = proc_dointvec,
1304 .extra1 = &zero,
1305 },
1306 #endif
1307 #ifdef CONFIG_HIGHMEM
1308 {
1309 .procname = "highmem_is_dirtyable",
1310 .data = &vm_highmem_is_dirtyable,
1311 .maxlen = sizeof(vm_highmem_is_dirtyable),
1312 .mode = 0644,
1313 .proc_handler = proc_dointvec_minmax,
1314 .extra1 = &zero,
1315 .extra2 = &one,
1316 },
1317 #endif
1318 {
1319 .procname = "scan_unevictable_pages",
1320 .data = &scan_unevictable_pages,
1321 .maxlen = sizeof(scan_unevictable_pages),
1322 .mode = 0644,
1323 .proc_handler = scan_unevictable_handler,
1324 },
1325 #ifdef CONFIG_MEMORY_FAILURE
1326 {
1327 .procname = "memory_failure_early_kill",
1328 .data = &sysctl_memory_failure_early_kill,
1329 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec_minmax,
1332 .extra1 = &zero,
1333 .extra2 = &one,
1334 },
1335 {
1336 .procname = "memory_failure_recovery",
1337 .data = &sysctl_memory_failure_recovery,
1338 .maxlen = sizeof(sysctl_memory_failure_recovery),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec_minmax,
1341 .extra1 = &zero,
1342 .extra2 = &one,
1343 },
1344 #endif
1345 { }
1346 };
1347
1348 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1349 static struct ctl_table binfmt_misc_table[] = {
1350 { }
1351 };
1352 #endif
1353
1354 static struct ctl_table fs_table[] = {
1355 {
1356 .procname = "inode-nr",
1357 .data = &inodes_stat,
1358 .maxlen = 2*sizeof(int),
1359 .mode = 0444,
1360 .proc_handler = proc_nr_inodes,
1361 },
1362 {
1363 .procname = "inode-state",
1364 .data = &inodes_stat,
1365 .maxlen = 7*sizeof(int),
1366 .mode = 0444,
1367 .proc_handler = proc_nr_inodes,
1368 },
1369 {
1370 .procname = "file-nr",
1371 .data = &files_stat,
1372 .maxlen = sizeof(files_stat),
1373 .mode = 0444,
1374 .proc_handler = proc_nr_files,
1375 },
1376 {
1377 .procname = "file-max",
1378 .data = &files_stat.max_files,
1379 .maxlen = sizeof(files_stat.max_files),
1380 .mode = 0644,
1381 .proc_handler = proc_doulongvec_minmax,
1382 },
1383 {
1384 .procname = "nr_open",
1385 .data = &sysctl_nr_open,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
1388 .proc_handler = proc_dointvec_minmax,
1389 .extra1 = &sysctl_nr_open_min,
1390 .extra2 = &sysctl_nr_open_max,
1391 },
1392 {
1393 .procname = "dentry-state",
1394 .data = &dentry_stat,
1395 .maxlen = 6*sizeof(int),
1396 .mode = 0444,
1397 .proc_handler = proc_nr_dentry,
1398 },
1399 {
1400 .procname = "overflowuid",
1401 .data = &fs_overflowuid,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
1404 .proc_handler = proc_dointvec_minmax,
1405 .extra1 = &minolduid,
1406 .extra2 = &maxolduid,
1407 },
1408 {
1409 .procname = "overflowgid",
1410 .data = &fs_overflowgid,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec_minmax,
1414 .extra1 = &minolduid,
1415 .extra2 = &maxolduid,
1416 },
1417 #ifdef CONFIG_FILE_LOCKING
1418 {
1419 .procname = "leases-enable",
1420 .data = &leases_enable,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec,
1424 },
1425 #endif
1426 #ifdef CONFIG_DNOTIFY
1427 {
1428 .procname = "dir-notify-enable",
1429 .data = &dir_notify_enable,
1430 .maxlen = sizeof(int),
1431 .mode = 0644,
1432 .proc_handler = proc_dointvec,
1433 },
1434 #endif
1435 #ifdef CONFIG_MMU
1436 #ifdef CONFIG_FILE_LOCKING
1437 {
1438 .procname = "lease-break-time",
1439 .data = &lease_break_time,
1440 .maxlen = sizeof(int),
1441 .mode = 0644,
1442 .proc_handler = proc_dointvec,
1443 },
1444 #endif
1445 #ifdef CONFIG_AIO
1446 {
1447 .procname = "aio-nr",
1448 .data = &aio_nr,
1449 .maxlen = sizeof(aio_nr),
1450 .mode = 0444,
1451 .proc_handler = proc_doulongvec_minmax,
1452 },
1453 {
1454 .procname = "aio-max-nr",
1455 .data = &aio_max_nr,
1456 .maxlen = sizeof(aio_max_nr),
1457 .mode = 0644,
1458 .proc_handler = proc_doulongvec_minmax,
1459 },
1460 #endif /* CONFIG_AIO */
1461 #ifdef CONFIG_INOTIFY_USER
1462 {
1463 .procname = "inotify",
1464 .mode = 0555,
1465 .child = inotify_table,
1466 },
1467 #endif
1468 #ifdef CONFIG_EPOLL
1469 {
1470 .procname = "epoll",
1471 .mode = 0555,
1472 .child = epoll_table,
1473 },
1474 #endif
1475 #endif
1476 {
1477 .procname = "suid_dumpable",
1478 .data = &suid_dumpable,
1479 .maxlen = sizeof(int),
1480 .mode = 0644,
1481 .proc_handler = proc_dointvec_minmax,
1482 .extra1 = &zero,
1483 .extra2 = &two,
1484 },
1485 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1486 {
1487 .procname = "binfmt_misc",
1488 .mode = 0555,
1489 .child = binfmt_misc_table,
1490 },
1491 #endif
1492 {
1493 .procname = "pipe-max-size",
1494 .data = &pipe_max_size,
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = &pipe_proc_fn,
1498 .extra1 = &pipe_min_size,
1499 },
1500 { }
1501 };
1502
1503 static struct ctl_table debug_table[] = {
1504 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1505 defined(CONFIG_S390)
1506 {
1507 .procname = "exception-trace",
1508 .data = &show_unhandled_signals,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = proc_dointvec
1512 },
1513 #endif
1514 #if defined(CONFIG_OPTPROBES)
1515 {
1516 .procname = "kprobes-optimization",
1517 .data = &sysctl_kprobes_optimization,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_kprobes_optimization_handler,
1521 .extra1 = &zero,
1522 .extra2 = &one,
1523 },
1524 #endif
1525 { }
1526 };
1527
1528 static struct ctl_table dev_table[] = {
1529 { }
1530 };
1531
1532 static DEFINE_SPINLOCK(sysctl_lock);
1533
1534 /* called under sysctl_lock */
1535 static int use_table(struct ctl_table_header *p)
1536 {
1537 if (unlikely(p->unregistering))
1538 return 0;
1539 p->used++;
1540 return 1;
1541 }
1542
1543 /* called under sysctl_lock */
1544 static void unuse_table(struct ctl_table_header *p)
1545 {
1546 if (!--p->used)
1547 if (unlikely(p->unregistering))
1548 complete(p->unregistering);
1549 }
1550
1551 /* called under sysctl_lock, will reacquire if has to wait */
1552 static void start_unregistering(struct ctl_table_header *p)
1553 {
1554 /*
1555 * if p->used is 0, nobody will ever touch that entry again;
1556 * we'll eliminate all paths to it before dropping sysctl_lock
1557 */
1558 if (unlikely(p->used)) {
1559 struct completion wait;
1560 init_completion(&wait);
1561 p->unregistering = &wait;
1562 spin_unlock(&sysctl_lock);
1563 wait_for_completion(&wait);
1564 spin_lock(&sysctl_lock);
1565 } else {
1566 /* anything non-NULL; we'll never dereference it */
1567 p->unregistering = ERR_PTR(-EINVAL);
1568 }
1569 /*
1570 * do not remove from the list until nobody holds it; walking the
1571 * list in do_sysctl() relies on that.
1572 */
1573 list_del_init(&p->ctl_entry);
1574 }
1575
1576 void sysctl_head_get(struct ctl_table_header *head)
1577 {
1578 spin_lock(&sysctl_lock);
1579 head->count++;
1580 spin_unlock(&sysctl_lock);
1581 }
1582
1583 static void free_head(struct rcu_head *rcu)
1584 {
1585 kfree(container_of(rcu, struct ctl_table_header, rcu));
1586 }
1587
1588 void sysctl_head_put(struct ctl_table_header *head)
1589 {
1590 spin_lock(&sysctl_lock);
1591 if (!--head->count)
1592 call_rcu(&head->rcu, free_head);
1593 spin_unlock(&sysctl_lock);
1594 }
1595
1596 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1597 {
1598 if (!head)
1599 BUG();
1600 spin_lock(&sysctl_lock);
1601 if (!use_table(head))
1602 head = ERR_PTR(-ENOENT);
1603 spin_unlock(&sysctl_lock);
1604 return head;
1605 }
1606
1607 void sysctl_head_finish(struct ctl_table_header *head)
1608 {
1609 if (!head)
1610 return;
1611 spin_lock(&sysctl_lock);
1612 unuse_table(head);
1613 spin_unlock(&sysctl_lock);
1614 }
1615
1616 static struct ctl_table_set *
1617 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1618 {
1619 struct ctl_table_set *set = &root->default_set;
1620 if (root->lookup)
1621 set = root->lookup(root, namespaces);
1622 return set;
1623 }
1624
1625 static struct list_head *
1626 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1627 {
1628 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1629 return &set->list;
1630 }
1631
1632 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1633 struct ctl_table_header *prev)
1634 {
1635 struct ctl_table_root *root;
1636 struct list_head *header_list;
1637 struct ctl_table_header *head;
1638 struct list_head *tmp;
1639
1640 spin_lock(&sysctl_lock);
1641 if (prev) {
1642 head = prev;
1643 tmp = &prev->ctl_entry;
1644 unuse_table(prev);
1645 goto next;
1646 }
1647 tmp = &root_table_header.ctl_entry;
1648 for (;;) {
1649 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1650
1651 if (!use_table(head))
1652 goto next;
1653 spin_unlock(&sysctl_lock);
1654 return head;
1655 next:
1656 root = head->root;
1657 tmp = tmp->next;
1658 header_list = lookup_header_list(root, namespaces);
1659 if (tmp != header_list)
1660 continue;
1661
1662 do {
1663 root = list_entry(root->root_list.next,
1664 struct ctl_table_root, root_list);
1665 if (root == &sysctl_table_root)
1666 goto out;
1667 header_list = lookup_header_list(root, namespaces);
1668 } while (list_empty(header_list));
1669 tmp = header_list->next;
1670 }
1671 out:
1672 spin_unlock(&sysctl_lock);
1673 return NULL;
1674 }
1675
1676 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1677 {
1678 return __sysctl_head_next(current->nsproxy, prev);
1679 }
1680
1681 void register_sysctl_root(struct ctl_table_root *root)
1682 {
1683 spin_lock(&sysctl_lock);
1684 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1685 spin_unlock(&sysctl_lock);
1686 }
1687
1688 /*
1689 * sysctl_perm does NOT grant the superuser all rights automatically, because
1690 * some sysctl variables are readonly even to root.
1691 */
1692
1693 static int test_perm(int mode, int op)
1694 {
1695 if (!current_euid())
1696 mode >>= 6;
1697 else if (in_egroup_p(0))
1698 mode >>= 3;
1699 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1700 return 0;
1701 return -EACCES;
1702 }
1703
1704 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1705 {
1706 int mode;
1707
1708 if (root->permissions)
1709 mode = root->permissions(root, current->nsproxy, table);
1710 else
1711 mode = table->mode;
1712
1713 return test_perm(mode, op);
1714 }
1715
1716 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1717 {
1718 for (; table->procname; table++) {
1719 table->parent = parent;
1720 if (table->child)
1721 sysctl_set_parent(table, table->child);
1722 }
1723 }
1724
1725 static __init int sysctl_init(void)
1726 {
1727 sysctl_set_parent(NULL, root_table);
1728 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1729 sysctl_check_table(current->nsproxy, root_table);
1730 #endif
1731 return 0;
1732 }
1733
1734 core_initcall(sysctl_init);
1735
1736 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1737 struct ctl_table *table)
1738 {
1739 struct ctl_table *p;
1740 const char *s = branch->procname;
1741
1742 /* branch should have named subdirectory as its first element */
1743 if (!s || !branch->child)
1744 return NULL;
1745
1746 /* ... and nothing else */
1747 if (branch[1].procname)
1748 return NULL;
1749
1750 /* table should contain subdirectory with the same name */
1751 for (p = table; p->procname; p++) {
1752 if (!p->child)
1753 continue;
1754 if (p->procname && strcmp(p->procname, s) == 0)
1755 return p;
1756 }
1757 return NULL;
1758 }
1759
1760 /* see if attaching q to p would be an improvement */
1761 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1762 {
1763 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1764 struct ctl_table *next;
1765 int is_better = 0;
1766 int not_in_parent = !p->attached_by;
1767
1768 while ((next = is_branch_in(by, to)) != NULL) {
1769 if (by == q->attached_by)
1770 is_better = 1;
1771 if (to == p->attached_by)
1772 not_in_parent = 1;
1773 by = by->child;
1774 to = next->child;
1775 }
1776
1777 if (is_better && not_in_parent) {
1778 q->attached_by = by;
1779 q->attached_to = to;
1780 q->parent = p;
1781 }
1782 }
1783
1784 /**
1785 * __register_sysctl_paths - register a sysctl hierarchy
1786 * @root: List of sysctl headers to register on
1787 * @namespaces: Data to compute which lists of sysctl entries are visible
1788 * @path: The path to the directory the sysctl table is in.
1789 * @table: the top-level table structure
1790 *
1791 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1792 * array. A completely 0 filled entry terminates the table.
1793 *
1794 * The members of the &struct ctl_table structure are used as follows:
1795 *
1796 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1797 * enter a sysctl file
1798 *
1799 * data - a pointer to data for use by proc_handler
1800 *
1801 * maxlen - the maximum size in bytes of the data
1802 *
1803 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1804 *
1805 * child - a pointer to the child sysctl table if this entry is a directory, or
1806 * %NULL.
1807 *
1808 * proc_handler - the text handler routine (described below)
1809 *
1810 * de - for internal use by the sysctl routines
1811 *
1812 * extra1, extra2 - extra pointers usable by the proc handler routines
1813 *
1814 * Leaf nodes in the sysctl tree will be represented by a single file
1815 * under /proc; non-leaf nodes will be represented by directories.
1816 *
1817 * sysctl(2) can automatically manage read and write requests through
1818 * the sysctl table. The data and maxlen fields of the ctl_table
1819 * struct enable minimal validation of the values being written to be
1820 * performed, and the mode field allows minimal authentication.
1821 *
1822 * There must be a proc_handler routine for any terminal nodes
1823 * mirrored under /proc/sys (non-terminals are handled by a built-in
1824 * directory handler). Several default handlers are available to
1825 * cover common cases -
1826 *
1827 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1828 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1829 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1830 *
1831 * It is the handler's job to read the input buffer from user memory
1832 * and process it. The handler should return 0 on success.
1833 *
1834 * This routine returns %NULL on a failure to register, and a pointer
1835 * to the table header on success.
1836 */
1837 struct ctl_table_header *__register_sysctl_paths(
1838 struct ctl_table_root *root,
1839 struct nsproxy *namespaces,
1840 const struct ctl_path *path, struct ctl_table *table)
1841 {
1842 struct ctl_table_header *header;
1843 struct ctl_table *new, **prevp;
1844 unsigned int n, npath;
1845 struct ctl_table_set *set;
1846
1847 /* Count the path components */
1848 for (npath = 0; path[npath].procname; ++npath)
1849 ;
1850
1851 /*
1852 * For each path component, allocate a 2-element ctl_table array.
1853 * The first array element will be filled with the sysctl entry
1854 * for this, the second will be the sentinel (procname == 0).
1855 *
1856 * We allocate everything in one go so that we don't have to
1857 * worry about freeing additional memory in unregister_sysctl_table.
1858 */
1859 header = kzalloc(sizeof(struct ctl_table_header) +
1860 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1861 if (!header)
1862 return NULL;
1863
1864 new = (struct ctl_table *) (header + 1);
1865
1866 /* Now connect the dots */
1867 prevp = &header->ctl_table;
1868 for (n = 0; n < npath; ++n, ++path) {
1869 /* Copy the procname */
1870 new->procname = path->procname;
1871 new->mode = 0555;
1872
1873 *prevp = new;
1874 prevp = &new->child;
1875
1876 new += 2;
1877 }
1878 *prevp = table;
1879 header->ctl_table_arg = table;
1880
1881 INIT_LIST_HEAD(&header->ctl_entry);
1882 header->used = 0;
1883 header->unregistering = NULL;
1884 header->root = root;
1885 sysctl_set_parent(NULL, header->ctl_table);
1886 header->count = 1;
1887 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1888 if (sysctl_check_table(namespaces, header->ctl_table)) {
1889 kfree(header);
1890 return NULL;
1891 }
1892 #endif
1893 spin_lock(&sysctl_lock);
1894 header->set = lookup_header_set(root, namespaces);
1895 header->attached_by = header->ctl_table;
1896 header->attached_to = root_table;
1897 header->parent = &root_table_header;
1898 for (set = header->set; set; set = set->parent) {
1899 struct ctl_table_header *p;
1900 list_for_each_entry(p, &set->list, ctl_entry) {
1901 if (p->unregistering)
1902 continue;
1903 try_attach(p, header);
1904 }
1905 }
1906 header->parent->count++;
1907 list_add_tail(&header->ctl_entry, &header->set->list);
1908 spin_unlock(&sysctl_lock);
1909
1910 return header;
1911 }
1912
1913 /**
1914 * register_sysctl_table_path - register a sysctl table hierarchy
1915 * @path: The path to the directory the sysctl table is in.
1916 * @table: the top-level table structure
1917 *
1918 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1919 * array. A completely 0 filled entry terminates the table.
1920 *
1921 * See __register_sysctl_paths for more details.
1922 */
1923 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1924 struct ctl_table *table)
1925 {
1926 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1927 path, table);
1928 }
1929
1930 /**
1931 * register_sysctl_table - register a sysctl table hierarchy
1932 * @table: the top-level table structure
1933 *
1934 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1935 * array. A completely 0 filled entry terminates the table.
1936 *
1937 * See register_sysctl_paths for more details.
1938 */
1939 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1940 {
1941 static const struct ctl_path null_path[] = { {} };
1942
1943 return register_sysctl_paths(null_path, table);
1944 }
1945
1946 /**
1947 * unregister_sysctl_table - unregister a sysctl table hierarchy
1948 * @header: the header returned from register_sysctl_table
1949 *
1950 * Unregisters the sysctl table and all children. proc entries may not
1951 * actually be removed until they are no longer used by anyone.
1952 */
1953 void unregister_sysctl_table(struct ctl_table_header * header)
1954 {
1955 might_sleep();
1956
1957 if (header == NULL)
1958 return;
1959
1960 spin_lock(&sysctl_lock);
1961 start_unregistering(header);
1962 if (!--header->parent->count) {
1963 WARN_ON(1);
1964 call_rcu(&header->parent->rcu, free_head);
1965 }
1966 if (!--header->count)
1967 call_rcu(&header->rcu, free_head);
1968 spin_unlock(&sysctl_lock);
1969 }
1970
1971 int sysctl_is_seen(struct ctl_table_header *p)
1972 {
1973 struct ctl_table_set *set = p->set;
1974 int res;
1975 spin_lock(&sysctl_lock);
1976 if (p->unregistering)
1977 res = 0;
1978 else if (!set->is_seen)
1979 res = 1;
1980 else
1981 res = set->is_seen(set);
1982 spin_unlock(&sysctl_lock);
1983 return res;
1984 }
1985
1986 void setup_sysctl_set(struct ctl_table_set *p,
1987 struct ctl_table_set *parent,
1988 int (*is_seen)(struct ctl_table_set *))
1989 {
1990 INIT_LIST_HEAD(&p->list);
1991 p->parent = parent ? parent : &sysctl_table_root.default_set;
1992 p->is_seen = is_seen;
1993 }
1994
1995 #else /* !CONFIG_SYSCTL */
1996 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1997 {
1998 return NULL;
1999 }
2000
2001 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2002 struct ctl_table *table)
2003 {
2004 return NULL;
2005 }
2006
2007 void unregister_sysctl_table(struct ctl_table_header * table)
2008 {
2009 }
2010
2011 void setup_sysctl_set(struct ctl_table_set *p,
2012 struct ctl_table_set *parent,
2013 int (*is_seen)(struct ctl_table_set *))
2014 {
2015 }
2016
2017 void sysctl_head_put(struct ctl_table_header *head)
2018 {
2019 }
2020
2021 #endif /* CONFIG_SYSCTL */
2022
2023 /*
2024 * /proc/sys support
2025 */
2026
2027 #ifdef CONFIG_PROC_SYSCTL
2028
2029 static int _proc_do_string(void* data, int maxlen, int write,
2030 void __user *buffer,
2031 size_t *lenp, loff_t *ppos)
2032 {
2033 size_t len;
2034 char __user *p;
2035 char c;
2036
2037 if (!data || !maxlen || !*lenp) {
2038 *lenp = 0;
2039 return 0;
2040 }
2041
2042 if (write) {
2043 len = 0;
2044 p = buffer;
2045 while (len < *lenp) {
2046 if (get_user(c, p++))
2047 return -EFAULT;
2048 if (c == 0 || c == '\n')
2049 break;
2050 len++;
2051 }
2052 if (len >= maxlen)
2053 len = maxlen-1;
2054 if(copy_from_user(data, buffer, len))
2055 return -EFAULT;
2056 ((char *) data)[len] = 0;
2057 *ppos += *lenp;
2058 } else {
2059 len = strlen(data);
2060 if (len > maxlen)
2061 len = maxlen;
2062
2063 if (*ppos > len) {
2064 *lenp = 0;
2065 return 0;
2066 }
2067
2068 data += *ppos;
2069 len -= *ppos;
2070
2071 if (len > *lenp)
2072 len = *lenp;
2073 if (len)
2074 if(copy_to_user(buffer, data, len))
2075 return -EFAULT;
2076 if (len < *lenp) {
2077 if(put_user('\n', ((char __user *) buffer) + len))
2078 return -EFAULT;
2079 len++;
2080 }
2081 *lenp = len;
2082 *ppos += len;
2083 }
2084 return 0;
2085 }
2086
2087 /**
2088 * proc_dostring - read a string sysctl
2089 * @table: the sysctl table
2090 * @write: %TRUE if this is a write to the sysctl file
2091 * @buffer: the user buffer
2092 * @lenp: the size of the user buffer
2093 * @ppos: file position
2094 *
2095 * Reads/writes a string from/to the user buffer. If the kernel
2096 * buffer provided is not large enough to hold the string, the
2097 * string is truncated. The copied string is %NULL-terminated.
2098 * If the string is being read by the user process, it is copied
2099 * and a newline '\n' is added. It is truncated if the buffer is
2100 * not large enough.
2101 *
2102 * Returns 0 on success.
2103 */
2104 int proc_dostring(struct ctl_table *table, int write,
2105 void __user *buffer, size_t *lenp, loff_t *ppos)
2106 {
2107 return _proc_do_string(table->data, table->maxlen, write,
2108 buffer, lenp, ppos);
2109 }
2110
2111 static size_t proc_skip_spaces(char **buf)
2112 {
2113 size_t ret;
2114 char *tmp = skip_spaces(*buf);
2115 ret = tmp - *buf;
2116 *buf = tmp;
2117 return ret;
2118 }
2119
2120 static void proc_skip_char(char **buf, size_t *size, const char v)
2121 {
2122 while (*size) {
2123 if (**buf != v)
2124 break;
2125 (*size)--;
2126 (*buf)++;
2127 }
2128 }
2129
2130 #define TMPBUFLEN 22
2131 /**
2132 * proc_get_long - reads an ASCII formatted integer from a user buffer
2133 *
2134 * @buf: a kernel buffer
2135 * @size: size of the kernel buffer
2136 * @val: this is where the number will be stored
2137 * @neg: set to %TRUE if number is negative
2138 * @perm_tr: a vector which contains the allowed trailers
2139 * @perm_tr_len: size of the perm_tr vector
2140 * @tr: pointer to store the trailer character
2141 *
2142 * In case of success %0 is returned and @buf and @size are updated with
2143 * the amount of bytes read. If @tr is non-NULL and a trailing
2144 * character exists (size is non-zero after returning from this
2145 * function), @tr is updated with the trailing character.
2146 */
2147 static int proc_get_long(char **buf, size_t *size,
2148 unsigned long *val, bool *neg,
2149 const char *perm_tr, unsigned perm_tr_len, char *tr)
2150 {
2151 int len;
2152 char *p, tmp[TMPBUFLEN];
2153
2154 if (!*size)
2155 return -EINVAL;
2156
2157 len = *size;
2158 if (len > TMPBUFLEN - 1)
2159 len = TMPBUFLEN - 1;
2160
2161 memcpy(tmp, *buf, len);
2162
2163 tmp[len] = 0;
2164 p = tmp;
2165 if (*p == '-' && *size > 1) {
2166 *neg = true;
2167 p++;
2168 } else
2169 *neg = false;
2170 if (!isdigit(*p))
2171 return -EINVAL;
2172
2173 *val = simple_strtoul(p, &p, 0);
2174
2175 len = p - tmp;
2176
2177 /* We don't know if the next char is whitespace thus we may accept
2178 * invalid integers (e.g. 1234...a) or two integers instead of one
2179 * (e.g. 123...1). So lets not allow such large numbers. */
2180 if (len == TMPBUFLEN - 1)
2181 return -EINVAL;
2182
2183 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2184 return -EINVAL;
2185
2186 if (tr && (len < *size))
2187 *tr = *p;
2188
2189 *buf += len;
2190 *size -= len;
2191
2192 return 0;
2193 }
2194
2195 /**
2196 * proc_put_long - converts an integer to a decimal ASCII formatted string
2197 *
2198 * @buf: the user buffer
2199 * @size: the size of the user buffer
2200 * @val: the integer to be converted
2201 * @neg: sign of the number, %TRUE for negative
2202 *
2203 * In case of success %0 is returned and @buf and @size are updated with
2204 * the amount of bytes written.
2205 */
2206 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2207 bool neg)
2208 {
2209 int len;
2210 char tmp[TMPBUFLEN], *p = tmp;
2211
2212 sprintf(p, "%s%lu", neg ? "-" : "", val);
2213 len = strlen(tmp);
2214 if (len > *size)
2215 len = *size;
2216 if (copy_to_user(*buf, tmp, len))
2217 return -EFAULT;
2218 *size -= len;
2219 *buf += len;
2220 return 0;
2221 }
2222 #undef TMPBUFLEN
2223
2224 static int proc_put_char(void __user **buf, size_t *size, char c)
2225 {
2226 if (*size) {
2227 char __user **buffer = (char __user **)buf;
2228 if (put_user(c, *buffer))
2229 return -EFAULT;
2230 (*size)--, (*buffer)++;
2231 *buf = *buffer;
2232 }
2233 return 0;
2234 }
2235
2236 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2237 int *valp,
2238 int write, void *data)
2239 {
2240 if (write) {
2241 *valp = *negp ? -*lvalp : *lvalp;
2242 } else {
2243 int val = *valp;
2244 if (val < 0) {
2245 *negp = true;
2246 *lvalp = (unsigned long)-val;
2247 } else {
2248 *negp = false;
2249 *lvalp = (unsigned long)val;
2250 }
2251 }
2252 return 0;
2253 }
2254
2255 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2256
2257 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2258 int write, void __user *buffer,
2259 size_t *lenp, loff_t *ppos,
2260 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2261 int write, void *data),
2262 void *data)
2263 {
2264 int *i, vleft, first = 1, err = 0;
2265 unsigned long page = 0;
2266 size_t left;
2267 char *kbuf;
2268
2269 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2270 *lenp = 0;
2271 return 0;
2272 }
2273
2274 i = (int *) tbl_data;
2275 vleft = table->maxlen / sizeof(*i);
2276 left = *lenp;
2277
2278 if (!conv)
2279 conv = do_proc_dointvec_conv;
2280
2281 if (write) {
2282 if (left > PAGE_SIZE - 1)
2283 left = PAGE_SIZE - 1;
2284 page = __get_free_page(GFP_TEMPORARY);
2285 kbuf = (char *) page;
2286 if (!kbuf)
2287 return -ENOMEM;
2288 if (copy_from_user(kbuf, buffer, left)) {
2289 err = -EFAULT;
2290 goto free;
2291 }
2292 kbuf[left] = 0;
2293 }
2294
2295 for (; left && vleft--; i++, first=0) {
2296 unsigned long lval;
2297 bool neg;
2298
2299 if (write) {
2300 left -= proc_skip_spaces(&kbuf);
2301
2302 if (!left)
2303 break;
2304 err = proc_get_long(&kbuf, &left, &lval, &neg,
2305 proc_wspace_sep,
2306 sizeof(proc_wspace_sep), NULL);
2307 if (err)
2308 break;
2309 if (conv(&neg, &lval, i, 1, data)) {
2310 err = -EINVAL;
2311 break;
2312 }
2313 } else {
2314 if (conv(&neg, &lval, i, 0, data)) {
2315 err = -EINVAL;
2316 break;
2317 }
2318 if (!first)
2319 err = proc_put_char(&buffer, &left, '\t');
2320 if (err)
2321 break;
2322 err = proc_put_long(&buffer, &left, lval, neg);
2323 if (err)
2324 break;
2325 }
2326 }
2327
2328 if (!write && !first && left && !err)
2329 err = proc_put_char(&buffer, &left, '\n');
2330 if (write && !err && left)
2331 left -= proc_skip_spaces(&kbuf);
2332 free:
2333 if (write) {
2334 free_page(page);
2335 if (first)
2336 return err ? : -EINVAL;
2337 }
2338 *lenp -= left;
2339 *ppos += *lenp;
2340 return err;
2341 }
2342
2343 static int do_proc_dointvec(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos,
2345 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2346 int write, void *data),
2347 void *data)
2348 {
2349 return __do_proc_dointvec(table->data, table, write,
2350 buffer, lenp, ppos, conv, data);
2351 }
2352
2353 /**
2354 * proc_dointvec - read a vector of integers
2355 * @table: the sysctl table
2356 * @write: %TRUE if this is a write to the sysctl file
2357 * @buffer: the user buffer
2358 * @lenp: the size of the user buffer
2359 * @ppos: file position
2360 *
2361 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2362 * values from/to the user buffer, treated as an ASCII string.
2363 *
2364 * Returns 0 on success.
2365 */
2366 int proc_dointvec(struct ctl_table *table, int write,
2367 void __user *buffer, size_t *lenp, loff_t *ppos)
2368 {
2369 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2370 NULL,NULL);
2371 }
2372
2373 /*
2374 * Taint values can only be increased
2375 * This means we can safely use a temporary.
2376 */
2377 static int proc_taint(struct ctl_table *table, int write,
2378 void __user *buffer, size_t *lenp, loff_t *ppos)
2379 {
2380 struct ctl_table t;
2381 unsigned long tmptaint = get_taint();
2382 int err;
2383
2384 if (write && !capable(CAP_SYS_ADMIN))
2385 return -EPERM;
2386
2387 t = *table;
2388 t.data = &tmptaint;
2389 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2390 if (err < 0)
2391 return err;
2392
2393 if (write) {
2394 /*
2395 * Poor man's atomic or. Not worth adding a primitive
2396 * to everyone's atomic.h for this
2397 */
2398 int i;
2399 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2400 if ((tmptaint >> i) & 1)
2401 add_taint(i);
2402 }
2403 }
2404
2405 return err;
2406 }
2407
2408 #ifdef CONFIG_PRINTK
2409 static int proc_dmesg_restrict(struct ctl_table *table, int write,
2410 void __user *buffer, size_t *lenp, loff_t *ppos)
2411 {
2412 if (write && !capable(CAP_SYS_ADMIN))
2413 return -EPERM;
2414
2415 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2416 }
2417 #endif
2418
2419 struct do_proc_dointvec_minmax_conv_param {
2420 int *min;
2421 int *max;
2422 };
2423
2424 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2425 int *valp,
2426 int write, void *data)
2427 {
2428 struct do_proc_dointvec_minmax_conv_param *param = data;
2429 if (write) {
2430 int val = *negp ? -*lvalp : *lvalp;
2431 if ((param->min && *param->min > val) ||
2432 (param->max && *param->max < val))
2433 return -EINVAL;
2434 *valp = val;
2435 } else {
2436 int val = *valp;
2437 if (val < 0) {
2438 *negp = true;
2439 *lvalp = (unsigned long)-val;
2440 } else {
2441 *negp = false;
2442 *lvalp = (unsigned long)val;
2443 }
2444 }
2445 return 0;
2446 }
2447
2448 /**
2449 * proc_dointvec_minmax - read a vector of integers with min/max values
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 *
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2457 * values from/to the user buffer, treated as an ASCII string.
2458 *
2459 * This routine will ensure the values are within the range specified by
2460 * table->extra1 (min) and table->extra2 (max).
2461 *
2462 * Returns 0 on success.
2463 */
2464 int proc_dointvec_minmax(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467 struct do_proc_dointvec_minmax_conv_param param = {
2468 .min = (int *) table->extra1,
2469 .max = (int *) table->extra2,
2470 };
2471 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2472 do_proc_dointvec_minmax_conv, &param);
2473 }
2474
2475 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2476 void __user *buffer,
2477 size_t *lenp, loff_t *ppos,
2478 unsigned long convmul,
2479 unsigned long convdiv)
2480 {
2481 unsigned long *i, *min, *max;
2482 int vleft, first = 1, err = 0;
2483 unsigned long page = 0;
2484 size_t left;
2485 char *kbuf;
2486
2487 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2488 *lenp = 0;
2489 return 0;
2490 }
2491
2492 i = (unsigned long *) data;
2493 min = (unsigned long *) table->extra1;
2494 max = (unsigned long *) table->extra2;
2495 vleft = table->maxlen / sizeof(unsigned long);
2496 left = *lenp;
2497
2498 if (write) {
2499 if (left > PAGE_SIZE - 1)
2500 left = PAGE_SIZE - 1;
2501 page = __get_free_page(GFP_TEMPORARY);
2502 kbuf = (char *) page;
2503 if (!kbuf)
2504 return -ENOMEM;
2505 if (copy_from_user(kbuf, buffer, left)) {
2506 err = -EFAULT;
2507 goto free;
2508 }
2509 kbuf[left] = 0;
2510 }
2511
2512 for (; left && vleft--; i++, first = 0) {
2513 unsigned long val;
2514
2515 if (write) {
2516 bool neg;
2517
2518 left -= proc_skip_spaces(&kbuf);
2519
2520 err = proc_get_long(&kbuf, &left, &val, &neg,
2521 proc_wspace_sep,
2522 sizeof(proc_wspace_sep), NULL);
2523 if (err)
2524 break;
2525 if (neg)
2526 continue;
2527 if ((min && val < *min) || (max && val > *max))
2528 continue;
2529 *i = val;
2530 } else {
2531 val = convdiv * (*i) / convmul;
2532 if (!first)
2533 err = proc_put_char(&buffer, &left, '\t');
2534 err = proc_put_long(&buffer, &left, val, false);
2535 if (err)
2536 break;
2537 }
2538 }
2539
2540 if (!write && !first && left && !err)
2541 err = proc_put_char(&buffer, &left, '\n');
2542 if (write && !err)
2543 left -= proc_skip_spaces(&kbuf);
2544 free:
2545 if (write) {
2546 free_page(page);
2547 if (first)
2548 return err ? : -EINVAL;
2549 }
2550 *lenp -= left;
2551 *ppos += *lenp;
2552 return err;
2553 }
2554
2555 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2556 void __user *buffer,
2557 size_t *lenp, loff_t *ppos,
2558 unsigned long convmul,
2559 unsigned long convdiv)
2560 {
2561 return __do_proc_doulongvec_minmax(table->data, table, write,
2562 buffer, lenp, ppos, convmul, convdiv);
2563 }
2564
2565 /**
2566 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
2569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2572 *
2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2574 * values from/to the user buffer, treated as an ASCII string.
2575 *
2576 * This routine will ensure the values are within the range specified by
2577 * table->extra1 (min) and table->extra2 (max).
2578 *
2579 * Returns 0 on success.
2580 */
2581 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2582 void __user *buffer, size_t *lenp, loff_t *ppos)
2583 {
2584 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2585 }
2586
2587 /**
2588 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
2591 * @buffer: the user buffer
2592 * @lenp: the size of the user buffer
2593 * @ppos: file position
2594 *
2595 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2596 * values from/to the user buffer, treated as an ASCII string. The values
2597 * are treated as milliseconds, and converted to jiffies when they are stored.
2598 *
2599 * This routine will ensure the values are within the range specified by
2600 * table->extra1 (min) and table->extra2 (max).
2601 *
2602 * Returns 0 on success.
2603 */
2604 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2605 void __user *buffer,
2606 size_t *lenp, loff_t *ppos)
2607 {
2608 return do_proc_doulongvec_minmax(table, write, buffer,
2609 lenp, ppos, HZ, 1000l);
2610 }
2611
2612
2613 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2614 int *valp,
2615 int write, void *data)
2616 {
2617 if (write) {
2618 if (*lvalp > LONG_MAX / HZ)
2619 return 1;
2620 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2621 } else {
2622 int val = *valp;
2623 unsigned long lval;
2624 if (val < 0) {
2625 *negp = true;
2626 lval = (unsigned long)-val;
2627 } else {
2628 *negp = false;
2629 lval = (unsigned long)val;
2630 }
2631 *lvalp = lval / HZ;
2632 }
2633 return 0;
2634 }
2635
2636 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2637 int *valp,
2638 int write, void *data)
2639 {
2640 if (write) {
2641 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2642 return 1;
2643 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2644 } else {
2645 int val = *valp;
2646 unsigned long lval;
2647 if (val < 0) {
2648 *negp = true;
2649 lval = (unsigned long)-val;
2650 } else {
2651 *negp = false;
2652 lval = (unsigned long)val;
2653 }
2654 *lvalp = jiffies_to_clock_t(lval);
2655 }
2656 return 0;
2657 }
2658
2659 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2660 int *valp,
2661 int write, void *data)
2662 {
2663 if (write) {
2664 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2665 } else {
2666 int val = *valp;
2667 unsigned long lval;
2668 if (val < 0) {
2669 *negp = true;
2670 lval = (unsigned long)-val;
2671 } else {
2672 *negp = false;
2673 lval = (unsigned long)val;
2674 }
2675 *lvalp = jiffies_to_msecs(lval);
2676 }
2677 return 0;
2678 }
2679
2680 /**
2681 * proc_dointvec_jiffies - read a vector of integers as seconds
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
2684 * @buffer: the user buffer
2685 * @lenp: the size of the user buffer
2686 * @ppos: file position
2687 *
2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2689 * values from/to the user buffer, treated as an ASCII string.
2690 * The values read are assumed to be in seconds, and are converted into
2691 * jiffies.
2692 *
2693 * Returns 0 on success.
2694 */
2695 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2696 void __user *buffer, size_t *lenp, loff_t *ppos)
2697 {
2698 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2699 do_proc_dointvec_jiffies_conv,NULL);
2700 }
2701
2702 /**
2703 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2704 * @table: the sysctl table
2705 * @write: %TRUE if this is a write to the sysctl file
2706 * @buffer: the user buffer
2707 * @lenp: the size of the user buffer
2708 * @ppos: pointer to the file position
2709 *
2710 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2711 * values from/to the user buffer, treated as an ASCII string.
2712 * The values read are assumed to be in 1/USER_HZ seconds, and
2713 * are converted into jiffies.
2714 *
2715 * Returns 0 on success.
2716 */
2717 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2721 do_proc_dointvec_userhz_jiffies_conv,NULL);
2722 }
2723
2724 /**
2725 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2726 * @table: the sysctl table
2727 * @write: %TRUE if this is a write to the sysctl file
2728 * @buffer: the user buffer
2729 * @lenp: the size of the user buffer
2730 * @ppos: file position
2731 * @ppos: the current position in the file
2732 *
2733 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2734 * values from/to the user buffer, treated as an ASCII string.
2735 * The values read are assumed to be in 1/1000 seconds, and
2736 * are converted into jiffies.
2737 *
2738 * Returns 0 on success.
2739 */
2740 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2741 void __user *buffer, size_t *lenp, loff_t *ppos)
2742 {
2743 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2744 do_proc_dointvec_ms_jiffies_conv, NULL);
2745 }
2746
2747 static int proc_do_cad_pid(struct ctl_table *table, int write,
2748 void __user *buffer, size_t *lenp, loff_t *ppos)
2749 {
2750 struct pid *new_pid;
2751 pid_t tmp;
2752 int r;
2753
2754 tmp = pid_vnr(cad_pid);
2755
2756 r = __do_proc_dointvec(&tmp, table, write, buffer,
2757 lenp, ppos, NULL, NULL);
2758 if (r || !write)
2759 return r;
2760
2761 new_pid = find_get_pid(tmp);
2762 if (!new_pid)
2763 return -ESRCH;
2764
2765 put_pid(xchg(&cad_pid, new_pid));
2766 return 0;
2767 }
2768
2769 /**
2770 * proc_do_large_bitmap - read/write from/to a large bitmap
2771 * @table: the sysctl table
2772 * @write: %TRUE if this is a write to the sysctl file
2773 * @buffer: the user buffer
2774 * @lenp: the size of the user buffer
2775 * @ppos: file position
2776 *
2777 * The bitmap is stored at table->data and the bitmap length (in bits)
2778 * in table->maxlen.
2779 *
2780 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2781 * large bitmaps may be represented in a compact manner. Writing into
2782 * the file will clear the bitmap then update it with the given input.
2783 *
2784 * Returns 0 on success.
2785 */
2786 int proc_do_large_bitmap(struct ctl_table *table, int write,
2787 void __user *buffer, size_t *lenp, loff_t *ppos)
2788 {
2789 int err = 0;
2790 bool first = 1;
2791 size_t left = *lenp;
2792 unsigned long bitmap_len = table->maxlen;
2793 unsigned long *bitmap = (unsigned long *) table->data;
2794 unsigned long *tmp_bitmap = NULL;
2795 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2796
2797 if (!bitmap_len || !left || (*ppos && !write)) {
2798 *lenp = 0;
2799 return 0;
2800 }
2801
2802 if (write) {
2803 unsigned long page = 0;
2804 char *kbuf;
2805
2806 if (left > PAGE_SIZE - 1)
2807 left = PAGE_SIZE - 1;
2808
2809 page = __get_free_page(GFP_TEMPORARY);
2810 kbuf = (char *) page;
2811 if (!kbuf)
2812 return -ENOMEM;
2813 if (copy_from_user(kbuf, buffer, left)) {
2814 free_page(page);
2815 return -EFAULT;
2816 }
2817 kbuf[left] = 0;
2818
2819 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2820 GFP_KERNEL);
2821 if (!tmp_bitmap) {
2822 free_page(page);
2823 return -ENOMEM;
2824 }
2825 proc_skip_char(&kbuf, &left, '\n');
2826 while (!err && left) {
2827 unsigned long val_a, val_b;
2828 bool neg;
2829
2830 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2831 sizeof(tr_a), &c);
2832 if (err)
2833 break;
2834 if (val_a >= bitmap_len || neg) {
2835 err = -EINVAL;
2836 break;
2837 }
2838
2839 val_b = val_a;
2840 if (left) {
2841 kbuf++;
2842 left--;
2843 }
2844
2845 if (c == '-') {
2846 err = proc_get_long(&kbuf, &left, &val_b,
2847 &neg, tr_b, sizeof(tr_b),
2848 &c);
2849 if (err)
2850 break;
2851 if (val_b >= bitmap_len || neg ||
2852 val_a > val_b) {
2853 err = -EINVAL;
2854 break;
2855 }
2856 if (left) {
2857 kbuf++;
2858 left--;
2859 }
2860 }
2861
2862 while (val_a <= val_b)
2863 set_bit(val_a++, tmp_bitmap);
2864
2865 first = 0;
2866 proc_skip_char(&kbuf, &left, '\n');
2867 }
2868 free_page(page);
2869 } else {
2870 unsigned long bit_a, bit_b = 0;
2871
2872 while (left) {
2873 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2874 if (bit_a >= bitmap_len)
2875 break;
2876 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2877 bit_a + 1) - 1;
2878
2879 if (!first) {
2880 err = proc_put_char(&buffer, &left, ',');
2881 if (err)
2882 break;
2883 }
2884 err = proc_put_long(&buffer, &left, bit_a, false);
2885 if (err)
2886 break;
2887 if (bit_a != bit_b) {
2888 err = proc_put_char(&buffer, &left, '-');
2889 if (err)
2890 break;
2891 err = proc_put_long(&buffer, &left, bit_b, false);
2892 if (err)
2893 break;
2894 }
2895
2896 first = 0; bit_b++;
2897 }
2898 if (!err)
2899 err = proc_put_char(&buffer, &left, '\n');
2900 }
2901
2902 if (!err) {
2903 if (write) {
2904 if (*ppos)
2905 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2906 else
2907 memcpy(bitmap, tmp_bitmap,
2908 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2909 }
2910 kfree(tmp_bitmap);
2911 *lenp -= left;
2912 *ppos += *lenp;
2913 return 0;
2914 } else {
2915 kfree(tmp_bitmap);
2916 return err;
2917 }
2918 }
2919
2920 #else /* CONFIG_PROC_SYSCTL */
2921
2922 int proc_dostring(struct ctl_table *table, int write,
2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2924 {
2925 return -ENOSYS;
2926 }
2927
2928 int proc_dointvec(struct ctl_table *table, int write,
2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930 {
2931 return -ENOSYS;
2932 }
2933
2934 int proc_dointvec_minmax(struct ctl_table *table, int write,
2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2936 {
2937 return -ENOSYS;
2938 }
2939
2940 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2941 void __user *buffer, size_t *lenp, loff_t *ppos)
2942 {
2943 return -ENOSYS;
2944 }
2945
2946 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2947 void __user *buffer, size_t *lenp, loff_t *ppos)
2948 {
2949 return -ENOSYS;
2950 }
2951
2952 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2953 void __user *buffer, size_t *lenp, loff_t *ppos)
2954 {
2955 return -ENOSYS;
2956 }
2957
2958 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2959 void __user *buffer, size_t *lenp, loff_t *ppos)
2960 {
2961 return -ENOSYS;
2962 }
2963
2964 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2965 void __user *buffer,
2966 size_t *lenp, loff_t *ppos)
2967 {
2968 return -ENOSYS;
2969 }
2970
2971
2972 #endif /* CONFIG_PROC_SYSCTL */
2973
2974 /*
2975 * No sense putting this after each symbol definition, twice,
2976 * exception granted :-)
2977 */
2978 EXPORT_SYMBOL(proc_dointvec);
2979 EXPORT_SYMBOL(proc_dointvec_jiffies);
2980 EXPORT_SYMBOL(proc_dointvec_minmax);
2981 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2982 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2983 EXPORT_SYMBOL(proc_dostring);
2984 EXPORT_SYMBOL(proc_doulongvec_minmax);
2985 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2986 EXPORT_SYMBOL(register_sysctl_table);
2987 EXPORT_SYMBOL(register_sysctl_paths);
2988 EXPORT_SYMBOL(unregister_sysctl_table);
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