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mm: export fragmentation index via debugfs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blob4c93486b45d1285dc82d65b027cf308dd14c87ff
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/signal.h>
27 #include <linux/proc_fs.h>
28 #include <linux/security.h>
29 #include <linux/ctype.h>
30 #include <linux/kmemcheck.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/ratelimit.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.h>
54 #include <linux/kprobes.h>
55 #include <linux/pipe_fs_i.h>
56
57 #include <asm/uaccess.h>
58 #include <asm/processor.h>
59
60 #ifdef CONFIG_X86
61 #include <asm/nmi.h>
62 #include <asm/stacktrace.h>
63 #include <asm/io.h>
64 #endif
65 #ifdef CONFIG_BSD_PROCESS_ACCT
66 #include <linux/acct.h>
67 #endif
68 #ifdef CONFIG_RT_MUTEXES
69 #include <linux/rtmutex.h>
70 #endif
71 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
72 #include <linux/lockdep.h>
73 #endif
74 #ifdef CONFIG_CHR_DEV_SG
75 #include <scsi/sg.h>
76 #endif
77
78
79 #if defined(CONFIG_SYSCTL)
80
81 /* External variables not in a header file. */
82 extern int sysctl_overcommit_memory;
83 extern int sysctl_overcommit_ratio;
84 extern int sysctl_panic_on_oom;
85 extern int sysctl_oom_kill_allocating_task;
86 extern int sysctl_oom_dump_tasks;
87 extern int max_threads;
88 extern int core_uses_pid;
89 extern int suid_dumpable;
90 extern char core_pattern[];
91 extern unsigned int core_pipe_limit;
92 extern int pid_max;
93 extern int min_free_kbytes;
94 extern int pid_max_min, pid_max_max;
95 extern int sysctl_drop_caches;
96 extern int percpu_pagelist_fraction;
97 extern int compat_log;
98 extern int latencytop_enabled;
99 extern int sysctl_nr_open_min, sysctl_nr_open_max;
100 #ifndef CONFIG_MMU
101 extern int sysctl_nr_trim_pages;
102 #endif
103 #ifdef CONFIG_BLOCK
104 extern int blk_iopoll_enabled;
105 #endif
106
107 /* Constants used for minimum and maximum */
108 #ifdef CONFIG_DETECT_SOFTLOCKUP
109 static int sixty = 60;
110 static int neg_one = -1;
111 #endif
112
113 static int zero;
114 static int __maybe_unused one = 1;
115 static int __maybe_unused two = 2;
116 static unsigned long one_ul = 1;
117 static int one_hundred = 100;
118 #ifdef CONFIG_PRINTK
119 static int ten_thousand = 10000;
120 #endif
121
122 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
123 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
124
125 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
126 static int maxolduid = 65535;
127 static int minolduid;
128 static int min_percpu_pagelist_fract = 8;
129
130 static int ngroups_max = NGROUPS_MAX;
131
132 #ifdef CONFIG_SPARC
133 #include <asm/system.h>
134 #endif
135
136 #ifdef CONFIG_SPARC64
137 extern int sysctl_tsb_ratio;
138 #endif
139
140 #ifdef __hppa__
141 extern int pwrsw_enabled;
142 extern int unaligned_enabled;
143 #endif
144
145 #ifdef CONFIG_S390
146 #ifdef CONFIG_MATHEMU
147 extern int sysctl_ieee_emulation_warnings;
148 #endif
149 extern int sysctl_userprocess_debug;
150 extern int spin_retry;
151 #endif
152
153 #ifdef CONFIG_IA64
154 extern int no_unaligned_warning;
155 extern int unaligned_dump_stack;
156 #endif
157
158 extern struct ratelimit_state printk_ratelimit_state;
159
160 #ifdef CONFIG_PROC_SYSCTL
161 static int proc_do_cad_pid(struct ctl_table *table, int write,
162 void __user *buffer, size_t *lenp, loff_t *ppos);
163 static int proc_taint(struct ctl_table *table, int write,
164 void __user *buffer, size_t *lenp, loff_t *ppos);
165 #endif
166
167 #ifdef CONFIG_MAGIC_SYSRQ
168 static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
169
170 static int sysrq_sysctl_handler(ctl_table *table, int write,
171 void __user *buffer, size_t *lenp,
172 loff_t *ppos)
173 {
174 int error;
175
176 error = proc_dointvec(table, write, buffer, lenp, ppos);
177 if (error)
178 return error;
179
180 if (write)
181 sysrq_toggle_support(__sysrq_enabled);
182
183 return 0;
184 }
185
186 #endif
187
188 static struct ctl_table root_table[];
189 static struct ctl_table_root sysctl_table_root;
190 static struct ctl_table_header root_table_header = {
191 .count = 1,
192 .ctl_table = root_table,
193 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
194 .root = &sysctl_table_root,
195 .set = &sysctl_table_root.default_set,
196 };
197 static struct ctl_table_root sysctl_table_root = {
198 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
199 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
200 };
201
202 static struct ctl_table kern_table[];
203 static struct ctl_table vm_table[];
204 static struct ctl_table fs_table[];
205 static struct ctl_table debug_table[];
206 static struct ctl_table dev_table[];
207 extern struct ctl_table random_table[];
208 #ifdef CONFIG_INOTIFY_USER
209 extern struct ctl_table inotify_table[];
210 #endif
211 #ifdef CONFIG_EPOLL
212 extern struct ctl_table epoll_table[];
213 #endif
214
215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
216 int sysctl_legacy_va_layout;
217 #endif
218
219 /* The default sysctl tables: */
220
221 static struct ctl_table root_table[] = {
222 {
223 .procname = "kernel",
224 .mode = 0555,
225 .child = kern_table,
226 },
227 {
228 .procname = "vm",
229 .mode = 0555,
230 .child = vm_table,
231 },
232 {
233 .procname = "fs",
234 .mode = 0555,
235 .child = fs_table,
236 },
237 {
238 .procname = "debug",
239 .mode = 0555,
240 .child = debug_table,
241 },
242 {
243 .procname = "dev",
244 .mode = 0555,
245 .child = dev_table,
246 },
247 /*
248 * NOTE: do not add new entries to this table unless you have read
249 * Documentation/sysctl/ctl_unnumbered.txt
250 */
251 { }
252 };
253
254 #ifdef CONFIG_SCHED_DEBUG
255 static int min_sched_granularity_ns = 100000; /* 100 usecs */
256 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
257 static int min_wakeup_granularity_ns; /* 0 usecs */
258 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
259 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
260 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
261 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
262 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
263 #endif
264
265 static struct ctl_table kern_table[] = {
266 {
267 .procname = "sched_child_runs_first",
268 .data = &sysctl_sched_child_runs_first,
269 .maxlen = sizeof(unsigned int),
270 .mode = 0644,
271 .proc_handler = proc_dointvec,
272 },
273 #ifdef CONFIG_SCHED_DEBUG
274 {
275 .procname = "sched_min_granularity_ns",
276 .data = &sysctl_sched_min_granularity,
277 .maxlen = sizeof(unsigned int),
278 .mode = 0644,
279 .proc_handler = sched_proc_update_handler,
280 .extra1 = &min_sched_granularity_ns,
281 .extra2 = &max_sched_granularity_ns,
282 },
283 {
284 .procname = "sched_latency_ns",
285 .data = &sysctl_sched_latency,
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_wakeup_granularity_ns",
294 .data = &sysctl_sched_wakeup_granularity,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_wakeup_granularity_ns,
299 .extra2 = &max_wakeup_granularity_ns,
300 },
301 {
302 .procname = "sched_shares_ratelimit",
303 .data = &sysctl_sched_shares_ratelimit,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_sched_shares_ratelimit,
308 .extra2 = &max_sched_shares_ratelimit,
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_shares_thresh",
321 .data = &sysctl_sched_shares_thresh,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec_minmax,
325 .extra1 = &zero,
326 },
327 {
328 .procname = "sched_migration_cost",
329 .data = &sysctl_sched_migration_cost,
330 .maxlen = sizeof(unsigned int),
331 .mode = 0644,
332 .proc_handler = proc_dointvec,
333 },
334 {
335 .procname = "sched_nr_migrate",
336 .data = &sysctl_sched_nr_migrate,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 {
342 .procname = "sched_time_avg",
343 .data = &sysctl_sched_time_avg,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec,
347 },
348 {
349 .procname = "timer_migration",
350 .data = &sysctl_timer_migration,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec_minmax,
354 .extra1 = &zero,
355 .extra2 = &one,
356 },
357 #endif
358 {
359 .procname = "sched_rt_period_us",
360 .data = &sysctl_sched_rt_period,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = sched_rt_handler,
364 },
365 {
366 .procname = "sched_rt_runtime_us",
367 .data = &sysctl_sched_rt_runtime,
368 .maxlen = sizeof(int),
369 .mode = 0644,
370 .proc_handler = sched_rt_handler,
371 },
372 {
373 .procname = "sched_compat_yield",
374 .data = &sysctl_sched_compat_yield,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 },
379 #ifdef CONFIG_PROVE_LOCKING
380 {
381 .procname = "prove_locking",
382 .data = &prove_locking,
383 .maxlen = sizeof(int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec,
386 },
387 #endif
388 #ifdef CONFIG_LOCK_STAT
389 {
390 .procname = "lock_stat",
391 .data = &lock_stat,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = proc_dointvec,
395 },
396 #endif
397 {
398 .procname = "panic",
399 .data = &panic_timeout,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = proc_dointvec,
403 },
404 {
405 .procname = "core_uses_pid",
406 .data = &core_uses_pid,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec,
410 },
411 {
412 .procname = "core_pattern",
413 .data = core_pattern,
414 .maxlen = CORENAME_MAX_SIZE,
415 .mode = 0644,
416 .proc_handler = proc_dostring,
417 },
418 {
419 .procname = "core_pipe_limit",
420 .data = &core_pipe_limit,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec,
424 },
425 #ifdef CONFIG_PROC_SYSCTL
426 {
427 .procname = "tainted",
428 .maxlen = sizeof(long),
429 .mode = 0644,
430 .proc_handler = proc_taint,
431 },
432 #endif
433 #ifdef CONFIG_LATENCYTOP
434 {
435 .procname = "latencytop",
436 .data = &latencytop_enabled,
437 .maxlen = sizeof(int),
438 .mode = 0644,
439 .proc_handler = proc_dointvec,
440 },
441 #endif
442 #ifdef CONFIG_BLK_DEV_INITRD
443 {
444 .procname = "real-root-dev",
445 .data = &real_root_dev,
446 .maxlen = sizeof(int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec,
449 },
450 #endif
451 {
452 .procname = "print-fatal-signals",
453 .data = &print_fatal_signals,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec,
457 },
458 #ifdef CONFIG_SPARC
459 {
460 .procname = "reboot-cmd",
461 .data = reboot_command,
462 .maxlen = 256,
463 .mode = 0644,
464 .proc_handler = proc_dostring,
465 },
466 {
467 .procname = "stop-a",
468 .data = &stop_a_enabled,
469 .maxlen = sizeof (int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec,
472 },
473 {
474 .procname = "scons-poweroff",
475 .data = &scons_pwroff,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = proc_dointvec,
479 },
480 #endif
481 #ifdef CONFIG_SPARC64
482 {
483 .procname = "tsb-ratio",
484 .data = &sysctl_tsb_ratio,
485 .maxlen = sizeof (int),
486 .mode = 0644,
487 .proc_handler = proc_dointvec,
488 },
489 #endif
490 #ifdef __hppa__
491 {
492 .procname = "soft-power",
493 .data = &pwrsw_enabled,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec,
497 },
498 {
499 .procname = "unaligned-trap",
500 .data = &unaligned_enabled,
501 .maxlen = sizeof (int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec,
504 },
505 #endif
506 {
507 .procname = "ctrl-alt-del",
508 .data = &C_A_D,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = proc_dointvec,
512 },
513 #ifdef CONFIG_FUNCTION_TRACER
514 {
515 .procname = "ftrace_enabled",
516 .data = &ftrace_enabled,
517 .maxlen = sizeof(int),
518 .mode = 0644,
519 .proc_handler = ftrace_enable_sysctl,
520 },
521 #endif
522 #ifdef CONFIG_STACK_TRACER
523 {
524 .procname = "stack_tracer_enabled",
525 .data = &stack_tracer_enabled,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = stack_trace_sysctl,
529 },
530 #endif
531 #ifdef CONFIG_TRACING
532 {
533 .procname = "ftrace_dump_on_oops",
534 .data = &ftrace_dump_on_oops,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 #endif
540 #ifdef CONFIG_MODULES
541 {
542 .procname = "modprobe",
543 .data = &modprobe_path,
544 .maxlen = KMOD_PATH_LEN,
545 .mode = 0644,
546 .proc_handler = proc_dostring,
547 },
548 {
549 .procname = "modules_disabled",
550 .data = &modules_disabled,
551 .maxlen = sizeof(int),
552 .mode = 0644,
553 /* only handle a transition from default "0" to "1" */
554 .proc_handler = proc_dointvec_minmax,
555 .extra1 = &one,
556 .extra2 = &one,
557 },
558 #endif
559 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
560 {
561 .procname = "hotplug",
562 .data = &uevent_helper,
563 .maxlen = UEVENT_HELPER_PATH_LEN,
564 .mode = 0644,
565 .proc_handler = proc_dostring,
566 },
567 #endif
568 #ifdef CONFIG_CHR_DEV_SG
569 {
570 .procname = "sg-big-buff",
571 .data = &sg_big_buff,
572 .maxlen = sizeof (int),
573 .mode = 0444,
574 .proc_handler = proc_dointvec,
575 },
576 #endif
577 #ifdef CONFIG_BSD_PROCESS_ACCT
578 {
579 .procname = "acct",
580 .data = &acct_parm,
581 .maxlen = 3*sizeof(int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec,
584 },
585 #endif
586 #ifdef CONFIG_MAGIC_SYSRQ
587 {
588 .procname = "sysrq",
589 .data = &__sysrq_enabled,
590 .maxlen = sizeof (int),
591 .mode = 0644,
592 .proc_handler = sysrq_sysctl_handler,
593 },
594 #endif
595 #ifdef CONFIG_PROC_SYSCTL
596 {
597 .procname = "cad_pid",
598 .data = NULL,
599 .maxlen = sizeof (int),
600 .mode = 0600,
601 .proc_handler = proc_do_cad_pid,
602 },
603 #endif
604 {
605 .procname = "threads-max",
606 .data = &max_threads,
607 .maxlen = sizeof(int),
608 .mode = 0644,
609 .proc_handler = proc_dointvec,
610 },
611 {
612 .procname = "random",
613 .mode = 0555,
614 .child = random_table,
615 },
616 {
617 .procname = "overflowuid",
618 .data = &overflowuid,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec_minmax,
622 .extra1 = &minolduid,
623 .extra2 = &maxolduid,
624 },
625 {
626 .procname = "overflowgid",
627 .data = &overflowgid,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = proc_dointvec_minmax,
631 .extra1 = &minolduid,
632 .extra2 = &maxolduid,
633 },
634 #ifdef CONFIG_S390
635 #ifdef CONFIG_MATHEMU
636 {
637 .procname = "ieee_emulation_warnings",
638 .data = &sysctl_ieee_emulation_warnings,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = proc_dointvec,
642 },
643 #endif
644 {
645 .procname = "userprocess_debug",
646 .data = &show_unhandled_signals,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 .proc_handler = proc_dointvec,
650 },
651 #endif
652 {
653 .procname = "pid_max",
654 .data = &pid_max,
655 .maxlen = sizeof (int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec_minmax,
658 .extra1 = &pid_max_min,
659 .extra2 = &pid_max_max,
660 },
661 {
662 .procname = "panic_on_oops",
663 .data = &panic_on_oops,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = proc_dointvec,
667 },
668 #if defined CONFIG_PRINTK
669 {
670 .procname = "printk",
671 .data = &console_loglevel,
672 .maxlen = 4*sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec,
675 },
676 {
677 .procname = "printk_ratelimit",
678 .data = &printk_ratelimit_state.interval,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec_jiffies,
682 },
683 {
684 .procname = "printk_ratelimit_burst",
685 .data = &printk_ratelimit_state.burst,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690 {
691 .procname = "printk_delay",
692 .data = &printk_delay_msec,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec_minmax,
696 .extra1 = &zero,
697 .extra2 = &ten_thousand,
698 },
699 #endif
700 {
701 .procname = "ngroups_max",
702 .data = &ngroups_max,
703 .maxlen = sizeof (int),
704 .mode = 0444,
705 .proc_handler = proc_dointvec,
706 },
707 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
708 {
709 .procname = "unknown_nmi_panic",
710 .data = &unknown_nmi_panic,
711 .maxlen = sizeof (int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec,
714 },
715 {
716 .procname = "nmi_watchdog",
717 .data = &nmi_watchdog_enabled,
718 .maxlen = sizeof (int),
719 .mode = 0644,
720 .proc_handler = proc_nmi_enabled,
721 },
722 #endif
723 #if defined(CONFIG_X86)
724 {
725 .procname = "panic_on_unrecovered_nmi",
726 .data = &panic_on_unrecovered_nmi,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec,
730 },
731 {
732 .procname = "panic_on_io_nmi",
733 .data = &panic_on_io_nmi,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec,
737 },
738 {
739 .procname = "bootloader_type",
740 .data = &bootloader_type,
741 .maxlen = sizeof (int),
742 .mode = 0444,
743 .proc_handler = proc_dointvec,
744 },
745 {
746 .procname = "bootloader_version",
747 .data = &bootloader_version,
748 .maxlen = sizeof (int),
749 .mode = 0444,
750 .proc_handler = proc_dointvec,
751 },
752 {
753 .procname = "kstack_depth_to_print",
754 .data = &kstack_depth_to_print,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec,
758 },
759 {
760 .procname = "io_delay_type",
761 .data = &io_delay_type,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec,
765 },
766 #endif
767 #if defined(CONFIG_MMU)
768 {
769 .procname = "randomize_va_space",
770 .data = &randomize_va_space,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec,
774 },
775 #endif
776 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
777 {
778 .procname = "spin_retry",
779 .data = &spin_retry,
780 .maxlen = sizeof (int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec,
783 },
784 #endif
785 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
786 {
787 .procname = "acpi_video_flags",
788 .data = &acpi_realmode_flags,
789 .maxlen = sizeof (unsigned long),
790 .mode = 0644,
791 .proc_handler = proc_doulongvec_minmax,
792 },
793 #endif
794 #ifdef CONFIG_IA64
795 {
796 .procname = "ignore-unaligned-usertrap",
797 .data = &no_unaligned_warning,
798 .maxlen = sizeof (int),
799 .mode = 0644,
800 .proc_handler = proc_dointvec,
801 },
802 {
803 .procname = "unaligned-dump-stack",
804 .data = &unaligned_dump_stack,
805 .maxlen = sizeof (int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec,
808 },
809 #endif
810 #ifdef CONFIG_DETECT_SOFTLOCKUP
811 {
812 .procname = "softlockup_panic",
813 .data = &softlockup_panic,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec_minmax,
817 .extra1 = &zero,
818 .extra2 = &one,
819 },
820 {
821 .procname = "softlockup_thresh",
822 .data = &softlockup_thresh,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = proc_dosoftlockup_thresh,
826 .extra1 = &neg_one,
827 .extra2 = &sixty,
828 },
829 #endif
830 #ifdef CONFIG_DETECT_HUNG_TASK
831 {
832 .procname = "hung_task_panic",
833 .data = &sysctl_hung_task_panic,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec_minmax,
837 .extra1 = &zero,
838 .extra2 = &one,
839 },
840 {
841 .procname = "hung_task_check_count",
842 .data = &sysctl_hung_task_check_count,
843 .maxlen = sizeof(unsigned long),
844 .mode = 0644,
845 .proc_handler = proc_doulongvec_minmax,
846 },
847 {
848 .procname = "hung_task_timeout_secs",
849 .data = &sysctl_hung_task_timeout_secs,
850 .maxlen = sizeof(unsigned long),
851 .mode = 0644,
852 .proc_handler = proc_dohung_task_timeout_secs,
853 },
854 {
855 .procname = "hung_task_warnings",
856 .data = &sysctl_hung_task_warnings,
857 .maxlen = sizeof(unsigned long),
858 .mode = 0644,
859 .proc_handler = proc_doulongvec_minmax,
860 },
861 #endif
862 #ifdef CONFIG_COMPAT
863 {
864 .procname = "compat-log",
865 .data = &compat_log,
866 .maxlen = sizeof (int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 #endif
871 #ifdef CONFIG_RT_MUTEXES
872 {
873 .procname = "max_lock_depth",
874 .data = &max_lock_depth,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec,
878 },
879 #endif
880 {
881 .procname = "poweroff_cmd",
882 .data = &poweroff_cmd,
883 .maxlen = POWEROFF_CMD_PATH_LEN,
884 .mode = 0644,
885 .proc_handler = proc_dostring,
886 },
887 #ifdef CONFIG_KEYS
888 {
889 .procname = "keys",
890 .mode = 0555,
891 .child = key_sysctls,
892 },
893 #endif
894 #ifdef CONFIG_RCU_TORTURE_TEST
895 {
896 .procname = "rcutorture_runnable",
897 .data = &rcutorture_runnable,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_dointvec,
901 },
902 #endif
903 #ifdef CONFIG_SLOW_WORK
904 {
905 .procname = "slow-work",
906 .mode = 0555,
907 .child = slow_work_sysctls,
908 },
909 #endif
910 #ifdef CONFIG_PERF_EVENTS
911 {
912 .procname = "perf_event_paranoid",
913 .data = &sysctl_perf_event_paranoid,
914 .maxlen = sizeof(sysctl_perf_event_paranoid),
915 .mode = 0644,
916 .proc_handler = proc_dointvec,
917 },
918 {
919 .procname = "perf_event_mlock_kb",
920 .data = &sysctl_perf_event_mlock,
921 .maxlen = sizeof(sysctl_perf_event_mlock),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 {
926 .procname = "perf_event_max_sample_rate",
927 .data = &sysctl_perf_event_sample_rate,
928 .maxlen = sizeof(sysctl_perf_event_sample_rate),
929 .mode = 0644,
930 .proc_handler = proc_dointvec,
931 },
932 #endif
933 #ifdef CONFIG_KMEMCHECK
934 {
935 .procname = "kmemcheck",
936 .data = &kmemcheck_enabled,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = proc_dointvec,
940 },
941 #endif
942 #ifdef CONFIG_BLOCK
943 {
944 .procname = "blk_iopoll",
945 .data = &blk_iopoll_enabled,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec,
949 },
950 #endif
951 /*
952 * NOTE: do not add new entries to this table unless you have read
953 * Documentation/sysctl/ctl_unnumbered.txt
954 */
955 { }
956 };
957
958 static struct ctl_table vm_table[] = {
959 {
960 .procname = "overcommit_memory",
961 .data = &sysctl_overcommit_memory,
962 .maxlen = sizeof(sysctl_overcommit_memory),
963 .mode = 0644,
964 .proc_handler = proc_dointvec,
965 },
966 {
967 .procname = "panic_on_oom",
968 .data = &sysctl_panic_on_oom,
969 .maxlen = sizeof(sysctl_panic_on_oom),
970 .mode = 0644,
971 .proc_handler = proc_dointvec,
972 },
973 {
974 .procname = "oom_kill_allocating_task",
975 .data = &sysctl_oom_kill_allocating_task,
976 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
977 .mode = 0644,
978 .proc_handler = proc_dointvec,
979 },
980 {
981 .procname = "oom_dump_tasks",
982 .data = &sysctl_oom_dump_tasks,
983 .maxlen = sizeof(sysctl_oom_dump_tasks),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987 {
988 .procname = "overcommit_ratio",
989 .data = &sysctl_overcommit_ratio,
990 .maxlen = sizeof(sysctl_overcommit_ratio),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 {
995 .procname = "page-cluster",
996 .data = &page_cluster,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001 {
1002 .procname = "dirty_background_ratio",
1003 .data = &dirty_background_ratio,
1004 .maxlen = sizeof(dirty_background_ratio),
1005 .mode = 0644,
1006 .proc_handler = dirty_background_ratio_handler,
1007 .extra1 = &zero,
1008 .extra2 = &one_hundred,
1009 },
1010 {
1011 .procname = "dirty_background_bytes",
1012 .data = &dirty_background_bytes,
1013 .maxlen = sizeof(dirty_background_bytes),
1014 .mode = 0644,
1015 .proc_handler = dirty_background_bytes_handler,
1016 .extra1 = &one_ul,
1017 },
1018 {
1019 .procname = "dirty_ratio",
1020 .data = &vm_dirty_ratio,
1021 .maxlen = sizeof(vm_dirty_ratio),
1022 .mode = 0644,
1023 .proc_handler = dirty_ratio_handler,
1024 .extra1 = &zero,
1025 .extra2 = &one_hundred,
1026 },
1027 {
1028 .procname = "dirty_bytes",
1029 .data = &vm_dirty_bytes,
1030 .maxlen = sizeof(vm_dirty_bytes),
1031 .mode = 0644,
1032 .proc_handler = dirty_bytes_handler,
1033 .extra1 = &dirty_bytes_min,
1034 },
1035 {
1036 .procname = "dirty_writeback_centisecs",
1037 .data = &dirty_writeback_interval,
1038 .maxlen = sizeof(dirty_writeback_interval),
1039 .mode = 0644,
1040 .proc_handler = dirty_writeback_centisecs_handler,
1041 },
1042 {
1043 .procname = "dirty_expire_centisecs",
1044 .data = &dirty_expire_interval,
1045 .maxlen = sizeof(dirty_expire_interval),
1046 .mode = 0644,
1047 .proc_handler = proc_dointvec,
1048 },
1049 {
1050 .procname = "nr_pdflush_threads",
1051 .data = &nr_pdflush_threads,
1052 .maxlen = sizeof nr_pdflush_threads,
1053 .mode = 0444 /* read-only*/,
1054 .proc_handler = proc_dointvec,
1055 },
1056 {
1057 .procname = "swappiness",
1058 .data = &vm_swappiness,
1059 .maxlen = sizeof(vm_swappiness),
1060 .mode = 0644,
1061 .proc_handler = proc_dointvec_minmax,
1062 .extra1 = &zero,
1063 .extra2 = &one_hundred,
1064 },
1065 #ifdef CONFIG_HUGETLB_PAGE
1066 {
1067 .procname = "nr_hugepages",
1068 .data = NULL,
1069 .maxlen = sizeof(unsigned long),
1070 .mode = 0644,
1071 .proc_handler = hugetlb_sysctl_handler,
1072 .extra1 = (void *)&hugetlb_zero,
1073 .extra2 = (void *)&hugetlb_infinity,
1074 },
1075 #ifdef CONFIG_NUMA
1076 {
1077 .procname = "nr_hugepages_mempolicy",
1078 .data = NULL,
1079 .maxlen = sizeof(unsigned long),
1080 .mode = 0644,
1081 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1082 .extra1 = (void *)&hugetlb_zero,
1083 .extra2 = (void *)&hugetlb_infinity,
1084 },
1085 #endif
1086 {
1087 .procname = "hugetlb_shm_group",
1088 .data = &sysctl_hugetlb_shm_group,
1089 .maxlen = sizeof(gid_t),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec,
1092 },
1093 {
1094 .procname = "hugepages_treat_as_movable",
1095 .data = &hugepages_treat_as_movable,
1096 .maxlen = sizeof(int),
1097 .mode = 0644,
1098 .proc_handler = hugetlb_treat_movable_handler,
1099 },
1100 {
1101 .procname = "nr_overcommit_hugepages",
1102 .data = NULL,
1103 .maxlen = sizeof(unsigned long),
1104 .mode = 0644,
1105 .proc_handler = hugetlb_overcommit_handler,
1106 .extra1 = (void *)&hugetlb_zero,
1107 .extra2 = (void *)&hugetlb_infinity,
1108 },
1109 #endif
1110 {
1111 .procname = "lowmem_reserve_ratio",
1112 .data = &sysctl_lowmem_reserve_ratio,
1113 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1114 .mode = 0644,
1115 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1116 },
1117 {
1118 .procname = "drop_caches",
1119 .data = &sysctl_drop_caches,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = drop_caches_sysctl_handler,
1123 },
1124 {
1125 .procname = "min_free_kbytes",
1126 .data = &min_free_kbytes,
1127 .maxlen = sizeof(min_free_kbytes),
1128 .mode = 0644,
1129 .proc_handler = min_free_kbytes_sysctl_handler,
1130 .extra1 = &zero,
1131 },
1132 {
1133 .procname = "percpu_pagelist_fraction",
1134 .data = &percpu_pagelist_fraction,
1135 .maxlen = sizeof(percpu_pagelist_fraction),
1136 .mode = 0644,
1137 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1138 .extra1 = &min_percpu_pagelist_fract,
1139 },
1140 #ifdef CONFIG_MMU
1141 {
1142 .procname = "max_map_count",
1143 .data = &sysctl_max_map_count,
1144 .maxlen = sizeof(sysctl_max_map_count),
1145 .mode = 0644,
1146 .proc_handler = proc_dointvec_minmax,
1147 .extra1 = &zero,
1148 },
1149 #else
1150 {
1151 .procname = "nr_trim_pages",
1152 .data = &sysctl_nr_trim_pages,
1153 .maxlen = sizeof(sysctl_nr_trim_pages),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec_minmax,
1156 .extra1 = &zero,
1157 },
1158 #endif
1159 {
1160 .procname = "laptop_mode",
1161 .data = &laptop_mode,
1162 .maxlen = sizeof(laptop_mode),
1163 .mode = 0644,
1164 .proc_handler = proc_dointvec_jiffies,
1165 },
1166 {
1167 .procname = "block_dump",
1168 .data = &block_dump,
1169 .maxlen = sizeof(block_dump),
1170 .mode = 0644,
1171 .proc_handler = proc_dointvec,
1172 .extra1 = &zero,
1173 },
1174 {
1175 .procname = "vfs_cache_pressure",
1176 .data = &sysctl_vfs_cache_pressure,
1177 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec,
1180 .extra1 = &zero,
1181 },
1182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1183 {
1184 .procname = "legacy_va_layout",
1185 .data = &sysctl_legacy_va_layout,
1186 .maxlen = sizeof(sysctl_legacy_va_layout),
1187 .mode = 0644,
1188 .proc_handler = proc_dointvec,
1189 .extra1 = &zero,
1190 },
1191 #endif
1192 #ifdef CONFIG_NUMA
1193 {
1194 .procname = "zone_reclaim_mode",
1195 .data = &zone_reclaim_mode,
1196 .maxlen = sizeof(zone_reclaim_mode),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec,
1199 .extra1 = &zero,
1200 },
1201 {
1202 .procname = "min_unmapped_ratio",
1203 .data = &sysctl_min_unmapped_ratio,
1204 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1205 .mode = 0644,
1206 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1207 .extra1 = &zero,
1208 .extra2 = &one_hundred,
1209 },
1210 {
1211 .procname = "min_slab_ratio",
1212 .data = &sysctl_min_slab_ratio,
1213 .maxlen = sizeof(sysctl_min_slab_ratio),
1214 .mode = 0644,
1215 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1216 .extra1 = &zero,
1217 .extra2 = &one_hundred,
1218 },
1219 #endif
1220 #ifdef CONFIG_SMP
1221 {
1222 .procname = "stat_interval",
1223 .data = &sysctl_stat_interval,
1224 .maxlen = sizeof(sysctl_stat_interval),
1225 .mode = 0644,
1226 .proc_handler = proc_dointvec_jiffies,
1227 },
1228 #endif
1229 #ifdef CONFIG_MMU
1230 {
1231 .procname = "mmap_min_addr",
1232 .data = &dac_mmap_min_addr,
1233 .maxlen = sizeof(unsigned long),
1234 .mode = 0644,
1235 .proc_handler = mmap_min_addr_handler,
1236 },
1237 #endif
1238 #ifdef CONFIG_NUMA
1239 {
1240 .procname = "numa_zonelist_order",
1241 .data = &numa_zonelist_order,
1242 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1243 .mode = 0644,
1244 .proc_handler = numa_zonelist_order_handler,
1245 },
1246 #endif
1247 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1248 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1249 {
1250 .procname = "vdso_enabled",
1251 .data = &vdso_enabled,
1252 .maxlen = sizeof(vdso_enabled),
1253 .mode = 0644,
1254 .proc_handler = proc_dointvec,
1255 .extra1 = &zero,
1256 },
1257 #endif
1258 #ifdef CONFIG_HIGHMEM
1259 {
1260 .procname = "highmem_is_dirtyable",
1261 .data = &vm_highmem_is_dirtyable,
1262 .maxlen = sizeof(vm_highmem_is_dirtyable),
1263 .mode = 0644,
1264 .proc_handler = proc_dointvec_minmax,
1265 .extra1 = &zero,
1266 .extra2 = &one,
1267 },
1268 #endif
1269 {
1270 .procname = "scan_unevictable_pages",
1271 .data = &scan_unevictable_pages,
1272 .maxlen = sizeof(scan_unevictable_pages),
1273 .mode = 0644,
1274 .proc_handler = scan_unevictable_handler,
1275 },
1276 #ifdef CONFIG_MEMORY_FAILURE
1277 {
1278 .procname = "memory_failure_early_kill",
1279 .data = &sysctl_memory_failure_early_kill,
1280 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1281 .mode = 0644,
1282 .proc_handler = proc_dointvec_minmax,
1283 .extra1 = &zero,
1284 .extra2 = &one,
1285 },
1286 {
1287 .procname = "memory_failure_recovery",
1288 .data = &sysctl_memory_failure_recovery,
1289 .maxlen = sizeof(sysctl_memory_failure_recovery),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 .extra2 = &one,
1294 },
1295 #endif
1296
1297 /*
1298 * NOTE: do not add new entries to this table unless you have read
1299 * Documentation/sysctl/ctl_unnumbered.txt
1300 */
1301 { }
1302 };
1303
1304 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1305 static struct ctl_table binfmt_misc_table[] = {
1306 { }
1307 };
1308 #endif
1309
1310 static struct ctl_table fs_table[] = {
1311 {
1312 .procname = "inode-nr",
1313 .data = &inodes_stat,
1314 .maxlen = 2*sizeof(int),
1315 .mode = 0444,
1316 .proc_handler = proc_dointvec,
1317 },
1318 {
1319 .procname = "inode-state",
1320 .data = &inodes_stat,
1321 .maxlen = 7*sizeof(int),
1322 .mode = 0444,
1323 .proc_handler = proc_dointvec,
1324 },
1325 {
1326 .procname = "file-nr",
1327 .data = &files_stat,
1328 .maxlen = 3*sizeof(int),
1329 .mode = 0444,
1330 .proc_handler = proc_nr_files,
1331 },
1332 {
1333 .procname = "file-max",
1334 .data = &files_stat.max_files,
1335 .maxlen = sizeof(int),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec,
1338 },
1339 {
1340 .procname = "nr_open",
1341 .data = &sysctl_nr_open,
1342 .maxlen = sizeof(int),
1343 .mode = 0644,
1344 .proc_handler = proc_dointvec_minmax,
1345 .extra1 = &sysctl_nr_open_min,
1346 .extra2 = &sysctl_nr_open_max,
1347 },
1348 {
1349 .procname = "dentry-state",
1350 .data = &dentry_stat,
1351 .maxlen = 6*sizeof(int),
1352 .mode = 0444,
1353 .proc_handler = proc_dointvec,
1354 },
1355 {
1356 .procname = "overflowuid",
1357 .data = &fs_overflowuid,
1358 .maxlen = sizeof(int),
1359 .mode = 0644,
1360 .proc_handler = proc_dointvec_minmax,
1361 .extra1 = &minolduid,
1362 .extra2 = &maxolduid,
1363 },
1364 {
1365 .procname = "overflowgid",
1366 .data = &fs_overflowgid,
1367 .maxlen = sizeof(int),
1368 .mode = 0644,
1369 .proc_handler = proc_dointvec_minmax,
1370 .extra1 = &minolduid,
1371 .extra2 = &maxolduid,
1372 },
1373 #ifdef CONFIG_FILE_LOCKING
1374 {
1375 .procname = "leases-enable",
1376 .data = &leases_enable,
1377 .maxlen = sizeof(int),
1378 .mode = 0644,
1379 .proc_handler = proc_dointvec,
1380 },
1381 #endif
1382 #ifdef CONFIG_DNOTIFY
1383 {
1384 .procname = "dir-notify-enable",
1385 .data = &dir_notify_enable,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
1388 .proc_handler = proc_dointvec,
1389 },
1390 #endif
1391 #ifdef CONFIG_MMU
1392 #ifdef CONFIG_FILE_LOCKING
1393 {
1394 .procname = "lease-break-time",
1395 .data = &lease_break_time,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
1398 .proc_handler = proc_dointvec,
1399 },
1400 #endif
1401 #ifdef CONFIG_AIO
1402 {
1403 .procname = "aio-nr",
1404 .data = &aio_nr,
1405 .maxlen = sizeof(aio_nr),
1406 .mode = 0444,
1407 .proc_handler = proc_doulongvec_minmax,
1408 },
1409 {
1410 .procname = "aio-max-nr",
1411 .data = &aio_max_nr,
1412 .maxlen = sizeof(aio_max_nr),
1413 .mode = 0644,
1414 .proc_handler = proc_doulongvec_minmax,
1415 },
1416 #endif /* CONFIG_AIO */
1417 #ifdef CONFIG_INOTIFY_USER
1418 {
1419 .procname = "inotify",
1420 .mode = 0555,
1421 .child = inotify_table,
1422 },
1423 #endif
1424 #ifdef CONFIG_EPOLL
1425 {
1426 .procname = "epoll",
1427 .mode = 0555,
1428 .child = epoll_table,
1429 },
1430 #endif
1431 #endif
1432 {
1433 .procname = "suid_dumpable",
1434 .data = &suid_dumpable,
1435 .maxlen = sizeof(int),
1436 .mode = 0644,
1437 .proc_handler = proc_dointvec_minmax,
1438 .extra1 = &zero,
1439 .extra2 = &two,
1440 },
1441 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1442 {
1443 .procname = "binfmt_misc",
1444 .mode = 0555,
1445 .child = binfmt_misc_table,
1446 },
1447 #endif
1448 {
1449 .procname = "pipe-max-pages",
1450 .data = &pipe_max_pages,
1451 .maxlen = sizeof(int),
1452 .mode = 0644,
1453 .proc_handler = &proc_dointvec_minmax,
1454 .extra1 = &two,
1455 },
1456 /*
1457 * NOTE: do not add new entries to this table unless you have read
1458 * Documentation/sysctl/ctl_unnumbered.txt
1459 */
1460 { }
1461 };
1462
1463 static struct ctl_table debug_table[] = {
1464 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1465 defined(CONFIG_S390)
1466 {
1467 .procname = "exception-trace",
1468 .data = &show_unhandled_signals,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec
1472 },
1473 #endif
1474 #if defined(CONFIG_OPTPROBES)
1475 {
1476 .procname = "kprobes-optimization",
1477 .data = &sysctl_kprobes_optimization,
1478 .maxlen = sizeof(int),
1479 .mode = 0644,
1480 .proc_handler = proc_kprobes_optimization_handler,
1481 .extra1 = &zero,
1482 .extra2 = &one,
1483 },
1484 #endif
1485 { }
1486 };
1487
1488 static struct ctl_table dev_table[] = {
1489 { }
1490 };
1491
1492 static DEFINE_SPINLOCK(sysctl_lock);
1493
1494 /* called under sysctl_lock */
1495 static int use_table(struct ctl_table_header *p)
1496 {
1497 if (unlikely(p->unregistering))
1498 return 0;
1499 p->used++;
1500 return 1;
1501 }
1502
1503 /* called under sysctl_lock */
1504 static void unuse_table(struct ctl_table_header *p)
1505 {
1506 if (!--p->used)
1507 if (unlikely(p->unregistering))
1508 complete(p->unregistering);
1509 }
1510
1511 /* called under sysctl_lock, will reacquire if has to wait */
1512 static void start_unregistering(struct ctl_table_header *p)
1513 {
1514 /*
1515 * if p->used is 0, nobody will ever touch that entry again;
1516 * we'll eliminate all paths to it before dropping sysctl_lock
1517 */
1518 if (unlikely(p->used)) {
1519 struct completion wait;
1520 init_completion(&wait);
1521 p->unregistering = &wait;
1522 spin_unlock(&sysctl_lock);
1523 wait_for_completion(&wait);
1524 spin_lock(&sysctl_lock);
1525 } else {
1526 /* anything non-NULL; we'll never dereference it */
1527 p->unregistering = ERR_PTR(-EINVAL);
1528 }
1529 /*
1530 * do not remove from the list until nobody holds it; walking the
1531 * list in do_sysctl() relies on that.
1532 */
1533 list_del_init(&p->ctl_entry);
1534 }
1535
1536 void sysctl_head_get(struct ctl_table_header *head)
1537 {
1538 spin_lock(&sysctl_lock);
1539 head->count++;
1540 spin_unlock(&sysctl_lock);
1541 }
1542
1543 void sysctl_head_put(struct ctl_table_header *head)
1544 {
1545 spin_lock(&sysctl_lock);
1546 if (!--head->count)
1547 kfree(head);
1548 spin_unlock(&sysctl_lock);
1549 }
1550
1551 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1552 {
1553 if (!head)
1554 BUG();
1555 spin_lock(&sysctl_lock);
1556 if (!use_table(head))
1557 head = ERR_PTR(-ENOENT);
1558 spin_unlock(&sysctl_lock);
1559 return head;
1560 }
1561
1562 void sysctl_head_finish(struct ctl_table_header *head)
1563 {
1564 if (!head)
1565 return;
1566 spin_lock(&sysctl_lock);
1567 unuse_table(head);
1568 spin_unlock(&sysctl_lock);
1569 }
1570
1571 static struct ctl_table_set *
1572 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1573 {
1574 struct ctl_table_set *set = &root->default_set;
1575 if (root->lookup)
1576 set = root->lookup(root, namespaces);
1577 return set;
1578 }
1579
1580 static struct list_head *
1581 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1582 {
1583 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1584 return &set->list;
1585 }
1586
1587 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1588 struct ctl_table_header *prev)
1589 {
1590 struct ctl_table_root *root;
1591 struct list_head *header_list;
1592 struct ctl_table_header *head;
1593 struct list_head *tmp;
1594
1595 spin_lock(&sysctl_lock);
1596 if (prev) {
1597 head = prev;
1598 tmp = &prev->ctl_entry;
1599 unuse_table(prev);
1600 goto next;
1601 }
1602 tmp = &root_table_header.ctl_entry;
1603 for (;;) {
1604 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1605
1606 if (!use_table(head))
1607 goto next;
1608 spin_unlock(&sysctl_lock);
1609 return head;
1610 next:
1611 root = head->root;
1612 tmp = tmp->next;
1613 header_list = lookup_header_list(root, namespaces);
1614 if (tmp != header_list)
1615 continue;
1616
1617 do {
1618 root = list_entry(root->root_list.next,
1619 struct ctl_table_root, root_list);
1620 if (root == &sysctl_table_root)
1621 goto out;
1622 header_list = lookup_header_list(root, namespaces);
1623 } while (list_empty(header_list));
1624 tmp = header_list->next;
1625 }
1626 out:
1627 spin_unlock(&sysctl_lock);
1628 return NULL;
1629 }
1630
1631 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1632 {
1633 return __sysctl_head_next(current->nsproxy, prev);
1634 }
1635
1636 void register_sysctl_root(struct ctl_table_root *root)
1637 {
1638 spin_lock(&sysctl_lock);
1639 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1640 spin_unlock(&sysctl_lock);
1641 }
1642
1643 /*
1644 * sysctl_perm does NOT grant the superuser all rights automatically, because
1645 * some sysctl variables are readonly even to root.
1646 */
1647
1648 static int test_perm(int mode, int op)
1649 {
1650 if (!current_euid())
1651 mode >>= 6;
1652 else if (in_egroup_p(0))
1653 mode >>= 3;
1654 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1655 return 0;
1656 return -EACCES;
1657 }
1658
1659 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1660 {
1661 int error;
1662 int mode;
1663
1664 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1665 if (error)
1666 return error;
1667
1668 if (root->permissions)
1669 mode = root->permissions(root, current->nsproxy, table);
1670 else
1671 mode = table->mode;
1672
1673 return test_perm(mode, op);
1674 }
1675
1676 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1677 {
1678 for (; table->procname; table++) {
1679 table->parent = parent;
1680 if (table->child)
1681 sysctl_set_parent(table, table->child);
1682 }
1683 }
1684
1685 static __init int sysctl_init(void)
1686 {
1687 sysctl_set_parent(NULL, root_table);
1688 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1689 {
1690 int err;
1691 err = sysctl_check_table(current->nsproxy, root_table);
1692 }
1693 #endif
1694 return 0;
1695 }
1696
1697 core_initcall(sysctl_init);
1698
1699 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1700 struct ctl_table *table)
1701 {
1702 struct ctl_table *p;
1703 const char *s = branch->procname;
1704
1705 /* branch should have named subdirectory as its first element */
1706 if (!s || !branch->child)
1707 return NULL;
1708
1709 /* ... and nothing else */
1710 if (branch[1].procname)
1711 return NULL;
1712
1713 /* table should contain subdirectory with the same name */
1714 for (p = table; p->procname; p++) {
1715 if (!p->child)
1716 continue;
1717 if (p->procname && strcmp(p->procname, s) == 0)
1718 return p;
1719 }
1720 return NULL;
1721 }
1722
1723 /* see if attaching q to p would be an improvement */
1724 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1725 {
1726 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1727 struct ctl_table *next;
1728 int is_better = 0;
1729 int not_in_parent = !p->attached_by;
1730
1731 while ((next = is_branch_in(by, to)) != NULL) {
1732 if (by == q->attached_by)
1733 is_better = 1;
1734 if (to == p->attached_by)
1735 not_in_parent = 1;
1736 by = by->child;
1737 to = next->child;
1738 }
1739
1740 if (is_better && not_in_parent) {
1741 q->attached_by = by;
1742 q->attached_to = to;
1743 q->parent = p;
1744 }
1745 }
1746
1747 /**
1748 * __register_sysctl_paths - register a sysctl hierarchy
1749 * @root: List of sysctl headers to register on
1750 * @namespaces: Data to compute which lists of sysctl entries are visible
1751 * @path: The path to the directory the sysctl table is in.
1752 * @table: the top-level table structure
1753 *
1754 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1755 * array. A completely 0 filled entry terminates the table.
1756 *
1757 * The members of the &struct ctl_table structure are used as follows:
1758 *
1759 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1760 * enter a sysctl file
1761 *
1762 * data - a pointer to data for use by proc_handler
1763 *
1764 * maxlen - the maximum size in bytes of the data
1765 *
1766 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1767 *
1768 * child - a pointer to the child sysctl table if this entry is a directory, or
1769 * %NULL.
1770 *
1771 * proc_handler - the text handler routine (described below)
1772 *
1773 * de - for internal use by the sysctl routines
1774 *
1775 * extra1, extra2 - extra pointers usable by the proc handler routines
1776 *
1777 * Leaf nodes in the sysctl tree will be represented by a single file
1778 * under /proc; non-leaf nodes will be represented by directories.
1779 *
1780 * sysctl(2) can automatically manage read and write requests through
1781 * the sysctl table. The data and maxlen fields of the ctl_table
1782 * struct enable minimal validation of the values being written to be
1783 * performed, and the mode field allows minimal authentication.
1784 *
1785 * There must be a proc_handler routine for any terminal nodes
1786 * mirrored under /proc/sys (non-terminals are handled by a built-in
1787 * directory handler). Several default handlers are available to
1788 * cover common cases -
1789 *
1790 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1791 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1792 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1793 *
1794 * It is the handler's job to read the input buffer from user memory
1795 * and process it. The handler should return 0 on success.
1796 *
1797 * This routine returns %NULL on a failure to register, and a pointer
1798 * to the table header on success.
1799 */
1800 struct ctl_table_header *__register_sysctl_paths(
1801 struct ctl_table_root *root,
1802 struct nsproxy *namespaces,
1803 const struct ctl_path *path, struct ctl_table *table)
1804 {
1805 struct ctl_table_header *header;
1806 struct ctl_table *new, **prevp;
1807 unsigned int n, npath;
1808 struct ctl_table_set *set;
1809
1810 /* Count the path components */
1811 for (npath = 0; path[npath].procname; ++npath)
1812 ;
1813
1814 /*
1815 * For each path component, allocate a 2-element ctl_table array.
1816 * The first array element will be filled with the sysctl entry
1817 * for this, the second will be the sentinel (procname == 0).
1818 *
1819 * We allocate everything in one go so that we don't have to
1820 * worry about freeing additional memory in unregister_sysctl_table.
1821 */
1822 header = kzalloc(sizeof(struct ctl_table_header) +
1823 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1824 if (!header)
1825 return NULL;
1826
1827 new = (struct ctl_table *) (header + 1);
1828
1829 /* Now connect the dots */
1830 prevp = &header->ctl_table;
1831 for (n = 0; n < npath; ++n, ++path) {
1832 /* Copy the procname */
1833 new->procname = path->procname;
1834 new->mode = 0555;
1835
1836 *prevp = new;
1837 prevp = &new->child;
1838
1839 new += 2;
1840 }
1841 *prevp = table;
1842 header->ctl_table_arg = table;
1843
1844 INIT_LIST_HEAD(&header->ctl_entry);
1845 header->used = 0;
1846 header->unregistering = NULL;
1847 header->root = root;
1848 sysctl_set_parent(NULL, header->ctl_table);
1849 header->count = 1;
1850 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1851 if (sysctl_check_table(namespaces, header->ctl_table)) {
1852 kfree(header);
1853 return NULL;
1854 }
1855 #endif
1856 spin_lock(&sysctl_lock);
1857 header->set = lookup_header_set(root, namespaces);
1858 header->attached_by = header->ctl_table;
1859 header->attached_to = root_table;
1860 header->parent = &root_table_header;
1861 for (set = header->set; set; set = set->parent) {
1862 struct ctl_table_header *p;
1863 list_for_each_entry(p, &set->list, ctl_entry) {
1864 if (p->unregistering)
1865 continue;
1866 try_attach(p, header);
1867 }
1868 }
1869 header->parent->count++;
1870 list_add_tail(&header->ctl_entry, &header->set->list);
1871 spin_unlock(&sysctl_lock);
1872
1873 return header;
1874 }
1875
1876 /**
1877 * register_sysctl_table_path - register a sysctl table hierarchy
1878 * @path: The path to the directory the sysctl table is in.
1879 * @table: the top-level table structure
1880 *
1881 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1882 * array. A completely 0 filled entry terminates the table.
1883 *
1884 * See __register_sysctl_paths for more details.
1885 */
1886 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1887 struct ctl_table *table)
1888 {
1889 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1890 path, table);
1891 }
1892
1893 /**
1894 * register_sysctl_table - register a sysctl table hierarchy
1895 * @table: the top-level table structure
1896 *
1897 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1898 * array. A completely 0 filled entry terminates the table.
1899 *
1900 * See register_sysctl_paths for more details.
1901 */
1902 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1903 {
1904 static const struct ctl_path null_path[] = { {} };
1905
1906 return register_sysctl_paths(null_path, table);
1907 }
1908
1909 /**
1910 * unregister_sysctl_table - unregister a sysctl table hierarchy
1911 * @header: the header returned from register_sysctl_table
1912 *
1913 * Unregisters the sysctl table and all children. proc entries may not
1914 * actually be removed until they are no longer used by anyone.
1915 */
1916 void unregister_sysctl_table(struct ctl_table_header * header)
1917 {
1918 might_sleep();
1919
1920 if (header == NULL)
1921 return;
1922
1923 spin_lock(&sysctl_lock);
1924 start_unregistering(header);
1925 if (!--header->parent->count) {
1926 WARN_ON(1);
1927 kfree(header->parent);
1928 }
1929 if (!--header->count)
1930 kfree(header);
1931 spin_unlock(&sysctl_lock);
1932 }
1933
1934 int sysctl_is_seen(struct ctl_table_header *p)
1935 {
1936 struct ctl_table_set *set = p->set;
1937 int res;
1938 spin_lock(&sysctl_lock);
1939 if (p->unregistering)
1940 res = 0;
1941 else if (!set->is_seen)
1942 res = 1;
1943 else
1944 res = set->is_seen(set);
1945 spin_unlock(&sysctl_lock);
1946 return res;
1947 }
1948
1949 void setup_sysctl_set(struct ctl_table_set *p,
1950 struct ctl_table_set *parent,
1951 int (*is_seen)(struct ctl_table_set *))
1952 {
1953 INIT_LIST_HEAD(&p->list);
1954 p->parent = parent ? parent : &sysctl_table_root.default_set;
1955 p->is_seen = is_seen;
1956 }
1957
1958 #else /* !CONFIG_SYSCTL */
1959 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1960 {
1961 return NULL;
1962 }
1963
1964 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1965 struct ctl_table *table)
1966 {
1967 return NULL;
1968 }
1969
1970 void unregister_sysctl_table(struct ctl_table_header * table)
1971 {
1972 }
1973
1974 void setup_sysctl_set(struct ctl_table_set *p,
1975 struct ctl_table_set *parent,
1976 int (*is_seen)(struct ctl_table_set *))
1977 {
1978 }
1979
1980 void sysctl_head_put(struct ctl_table_header *head)
1981 {
1982 }
1983
1984 #endif /* CONFIG_SYSCTL */
1985
1986 /*
1987 * /proc/sys support
1988 */
1989
1990 #ifdef CONFIG_PROC_SYSCTL
1991
1992 static int _proc_do_string(void* data, int maxlen, int write,
1993 void __user *buffer,
1994 size_t *lenp, loff_t *ppos)
1995 {
1996 size_t len;
1997 char __user *p;
1998 char c;
1999
2000 if (!data || !maxlen || !*lenp) {
2001 *lenp = 0;
2002 return 0;
2003 }
2004
2005 if (write) {
2006 len = 0;
2007 p = buffer;
2008 while (len < *lenp) {
2009 if (get_user(c, p++))
2010 return -EFAULT;
2011 if (c == 0 || c == '\n')
2012 break;
2013 len++;
2014 }
2015 if (len >= maxlen)
2016 len = maxlen-1;
2017 if(copy_from_user(data, buffer, len))
2018 return -EFAULT;
2019 ((char *) data)[len] = 0;
2020 *ppos += *lenp;
2021 } else {
2022 len = strlen(data);
2023 if (len > maxlen)
2024 len = maxlen;
2025
2026 if (*ppos > len) {
2027 *lenp = 0;
2028 return 0;
2029 }
2030
2031 data += *ppos;
2032 len -= *ppos;
2033
2034 if (len > *lenp)
2035 len = *lenp;
2036 if (len)
2037 if(copy_to_user(buffer, data, len))
2038 return -EFAULT;
2039 if (len < *lenp) {
2040 if(put_user('\n', ((char __user *) buffer) + len))
2041 return -EFAULT;
2042 len++;
2043 }
2044 *lenp = len;
2045 *ppos += len;
2046 }
2047 return 0;
2048 }
2049
2050 /**
2051 * proc_dostring - read a string sysctl
2052 * @table: the sysctl table
2053 * @write: %TRUE if this is a write to the sysctl file
2054 * @buffer: the user buffer
2055 * @lenp: the size of the user buffer
2056 * @ppos: file position
2057 *
2058 * Reads/writes a string from/to the user buffer. If the kernel
2059 * buffer provided is not large enough to hold the string, the
2060 * string is truncated. The copied string is %NULL-terminated.
2061 * If the string is being read by the user process, it is copied
2062 * and a newline '\n' is added. It is truncated if the buffer is
2063 * not large enough.
2064 *
2065 * Returns 0 on success.
2066 */
2067 int proc_dostring(struct ctl_table *table, int write,
2068 void __user *buffer, size_t *lenp, loff_t *ppos)
2069 {
2070 return _proc_do_string(table->data, table->maxlen, write,
2071 buffer, lenp, ppos);
2072 }
2073
2074 static size_t proc_skip_spaces(char **buf)
2075 {
2076 size_t ret;
2077 char *tmp = skip_spaces(*buf);
2078 ret = tmp - *buf;
2079 *buf = tmp;
2080 return ret;
2081 }
2082
2083 static void proc_skip_char(char **buf, size_t *size, const char v)
2084 {
2085 while (*size) {
2086 if (**buf != v)
2087 break;
2088 (*size)--;
2089 (*buf)++;
2090 }
2091 }
2092
2093 #define TMPBUFLEN 22
2094 /**
2095 * proc_get_long - reads an ASCII formatted integer from a user buffer
2096 *
2097 * @buf: a kernel buffer
2098 * @size: size of the kernel buffer
2099 * @val: this is where the number will be stored
2100 * @neg: set to %TRUE if number is negative
2101 * @perm_tr: a vector which contains the allowed trailers
2102 * @perm_tr_len: size of the perm_tr vector
2103 * @tr: pointer to store the trailer character
2104 *
2105 * In case of success %0 is returned and @buf and @size are updated with
2106 * the amount of bytes read. If @tr is non-NULL and a trailing
2107 * character exists (size is non-zero after returning from this
2108 * function), @tr is updated with the trailing character.
2109 */
2110 static int proc_get_long(char **buf, size_t *size,
2111 unsigned long *val, bool *neg,
2112 const char *perm_tr, unsigned perm_tr_len, char *tr)
2113 {
2114 int len;
2115 char *p, tmp[TMPBUFLEN];
2116
2117 if (!*size)
2118 return -EINVAL;
2119
2120 len = *size;
2121 if (len > TMPBUFLEN - 1)
2122 len = TMPBUFLEN - 1;
2123
2124 memcpy(tmp, *buf, len);
2125
2126 tmp[len] = 0;
2127 p = tmp;
2128 if (*p == '-' && *size > 1) {
2129 *neg = true;
2130 p++;
2131 } else
2132 *neg = false;
2133 if (!isdigit(*p))
2134 return -EINVAL;
2135
2136 *val = simple_strtoul(p, &p, 0);
2137
2138 len = p - tmp;
2139
2140 /* We don't know if the next char is whitespace thus we may accept
2141 * invalid integers (e.g. 1234...a) or two integers instead of one
2142 * (e.g. 123...1). So lets not allow such large numbers. */
2143 if (len == TMPBUFLEN - 1)
2144 return -EINVAL;
2145
2146 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2147 return -EINVAL;
2148
2149 if (tr && (len < *size))
2150 *tr = *p;
2151
2152 *buf += len;
2153 *size -= len;
2154
2155 return 0;
2156 }
2157
2158 /**
2159 * proc_put_long - converts an integer to a decimal ASCII formatted string
2160 *
2161 * @buf: the user buffer
2162 * @size: the size of the user buffer
2163 * @val: the integer to be converted
2164 * @neg: sign of the number, %TRUE for negative
2165 *
2166 * In case of success %0 is returned and @buf and @size are updated with
2167 * the amount of bytes written.
2168 */
2169 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2170 bool neg)
2171 {
2172 int len;
2173 char tmp[TMPBUFLEN], *p = tmp;
2174
2175 sprintf(p, "%s%lu", neg ? "-" : "", val);
2176 len = strlen(tmp);
2177 if (len > *size)
2178 len = *size;
2179 if (copy_to_user(*buf, tmp, len))
2180 return -EFAULT;
2181 *size -= len;
2182 *buf += len;
2183 return 0;
2184 }
2185 #undef TMPBUFLEN
2186
2187 static int proc_put_char(void __user **buf, size_t *size, char c)
2188 {
2189 if (*size) {
2190 char __user **buffer = (char __user **)buf;
2191 if (put_user(c, *buffer))
2192 return -EFAULT;
2193 (*size)--, (*buffer)++;
2194 *buf = *buffer;
2195 }
2196 return 0;
2197 }
2198
2199 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2200 int *valp,
2201 int write, void *data)
2202 {
2203 if (write) {
2204 *valp = *negp ? -*lvalp : *lvalp;
2205 } else {
2206 int val = *valp;
2207 if (val < 0) {
2208 *negp = true;
2209 *lvalp = (unsigned long)-val;
2210 } else {
2211 *negp = false;
2212 *lvalp = (unsigned long)val;
2213 }
2214 }
2215 return 0;
2216 }
2217
2218 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2219
2220 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2221 int write, void __user *buffer,
2222 size_t *lenp, loff_t *ppos,
2223 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2224 int write, void *data),
2225 void *data)
2226 {
2227 int *i, vleft, first = 1, err = 0;
2228 unsigned long page = 0;
2229 size_t left;
2230 char *kbuf;
2231
2232 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2233 *lenp = 0;
2234 return 0;
2235 }
2236
2237 i = (int *) tbl_data;
2238 vleft = table->maxlen / sizeof(*i);
2239 left = *lenp;
2240
2241 if (!conv)
2242 conv = do_proc_dointvec_conv;
2243
2244 if (write) {
2245 if (left > PAGE_SIZE - 1)
2246 left = PAGE_SIZE - 1;
2247 page = __get_free_page(GFP_TEMPORARY);
2248 kbuf = (char *) page;
2249 if (!kbuf)
2250 return -ENOMEM;
2251 if (copy_from_user(kbuf, buffer, left)) {
2252 err = -EFAULT;
2253 goto free;
2254 }
2255 kbuf[left] = 0;
2256 }
2257
2258 for (; left && vleft--; i++, first=0) {
2259 unsigned long lval;
2260 bool neg;
2261
2262 if (write) {
2263 left -= proc_skip_spaces(&kbuf);
2264
2265 err = proc_get_long(&kbuf, &left, &lval, &neg,
2266 proc_wspace_sep,
2267 sizeof(proc_wspace_sep), NULL);
2268 if (err)
2269 break;
2270 if (conv(&neg, &lval, i, 1, data)) {
2271 err = -EINVAL;
2272 break;
2273 }
2274 } else {
2275 if (conv(&neg, &lval, i, 0, data)) {
2276 err = -EINVAL;
2277 break;
2278 }
2279 if (!first)
2280 err = proc_put_char(&buffer, &left, '\t');
2281 if (err)
2282 break;
2283 err = proc_put_long(&buffer, &left, lval, neg);
2284 if (err)
2285 break;
2286 }
2287 }
2288
2289 if (!write && !first && left && !err)
2290 err = proc_put_char(&buffer, &left, '\n');
2291 if (write && !err)
2292 left -= proc_skip_spaces(&kbuf);
2293 free:
2294 if (write) {
2295 free_page(page);
2296 if (first)
2297 return err ? : -EINVAL;
2298 }
2299 *lenp -= left;
2300 *ppos += *lenp;
2301 return err;
2302 }
2303
2304 static int do_proc_dointvec(struct ctl_table *table, int write,
2305 void __user *buffer, size_t *lenp, loff_t *ppos,
2306 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2307 int write, void *data),
2308 void *data)
2309 {
2310 return __do_proc_dointvec(table->data, table, write,
2311 buffer, lenp, ppos, conv, data);
2312 }
2313
2314 /**
2315 * proc_dointvec - read a vector of integers
2316 * @table: the sysctl table
2317 * @write: %TRUE if this is a write to the sysctl file
2318 * @buffer: the user buffer
2319 * @lenp: the size of the user buffer
2320 * @ppos: file position
2321 *
2322 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2323 * values from/to the user buffer, treated as an ASCII string.
2324 *
2325 * Returns 0 on success.
2326 */
2327 int proc_dointvec(struct ctl_table *table, int write,
2328 void __user *buffer, size_t *lenp, loff_t *ppos)
2329 {
2330 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2331 NULL,NULL);
2332 }
2333
2334 /*
2335 * Taint values can only be increased
2336 * This means we can safely use a temporary.
2337 */
2338 static int proc_taint(struct ctl_table *table, int write,
2339 void __user *buffer, size_t *lenp, loff_t *ppos)
2340 {
2341 struct ctl_table t;
2342 unsigned long tmptaint = get_taint();
2343 int err;
2344
2345 if (write && !capable(CAP_SYS_ADMIN))
2346 return -EPERM;
2347
2348 t = *table;
2349 t.data = &tmptaint;
2350 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2351 if (err < 0)
2352 return err;
2353
2354 if (write) {
2355 /*
2356 * Poor man's atomic or. Not worth adding a primitive
2357 * to everyone's atomic.h for this
2358 */
2359 int i;
2360 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2361 if ((tmptaint >> i) & 1)
2362 add_taint(i);
2363 }
2364 }
2365
2366 return err;
2367 }
2368
2369 struct do_proc_dointvec_minmax_conv_param {
2370 int *min;
2371 int *max;
2372 };
2373
2374 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2375 int *valp,
2376 int write, void *data)
2377 {
2378 struct do_proc_dointvec_minmax_conv_param *param = data;
2379 if (write) {
2380 int val = *negp ? -*lvalp : *lvalp;
2381 if ((param->min && *param->min > val) ||
2382 (param->max && *param->max < val))
2383 return -EINVAL;
2384 *valp = val;
2385 } else {
2386 int val = *valp;
2387 if (val < 0) {
2388 *negp = true;
2389 *lvalp = (unsigned long)-val;
2390 } else {
2391 *negp = false;
2392 *lvalp = (unsigned long)val;
2393 }
2394 }
2395 return 0;
2396 }
2397
2398 /**
2399 * proc_dointvec_minmax - read a vector of integers with min/max values
2400 * @table: the sysctl table
2401 * @write: %TRUE if this is a write to the sysctl file
2402 * @buffer: the user buffer
2403 * @lenp: the size of the user buffer
2404 * @ppos: file position
2405 *
2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2407 * values from/to the user buffer, treated as an ASCII string.
2408 *
2409 * This routine will ensure the values are within the range specified by
2410 * table->extra1 (min) and table->extra2 (max).
2411 *
2412 * Returns 0 on success.
2413 */
2414 int proc_dointvec_minmax(struct ctl_table *table, int write,
2415 void __user *buffer, size_t *lenp, loff_t *ppos)
2416 {
2417 struct do_proc_dointvec_minmax_conv_param param = {
2418 .min = (int *) table->extra1,
2419 .max = (int *) table->extra2,
2420 };
2421 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2422 do_proc_dointvec_minmax_conv, &param);
2423 }
2424
2425 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2426 void __user *buffer,
2427 size_t *lenp, loff_t *ppos,
2428 unsigned long convmul,
2429 unsigned long convdiv)
2430 {
2431 unsigned long *i, *min, *max;
2432 int vleft, first = 1, err = 0;
2433 unsigned long page = 0;
2434 size_t left;
2435 char *kbuf;
2436
2437 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2438 *lenp = 0;
2439 return 0;
2440 }
2441
2442 i = (unsigned long *) data;
2443 min = (unsigned long *) table->extra1;
2444 max = (unsigned long *) table->extra2;
2445 vleft = table->maxlen / sizeof(unsigned long);
2446 left = *lenp;
2447
2448 if (write) {
2449 if (left > PAGE_SIZE - 1)
2450 left = PAGE_SIZE - 1;
2451 page = __get_free_page(GFP_TEMPORARY);
2452 kbuf = (char *) page;
2453 if (!kbuf)
2454 return -ENOMEM;
2455 if (copy_from_user(kbuf, buffer, left)) {
2456 err = -EFAULT;
2457 goto free;
2458 }
2459 kbuf[left] = 0;
2460 }
2461
2462 for (; left && vleft--; i++, min++, max++, first=0) {
2463 unsigned long val;
2464
2465 if (write) {
2466 bool neg;
2467
2468 left -= proc_skip_spaces(&kbuf);
2469
2470 err = proc_get_long(&kbuf, &left, &val, &neg,
2471 proc_wspace_sep,
2472 sizeof(proc_wspace_sep), NULL);
2473 if (err)
2474 break;
2475 if (neg)
2476 continue;
2477 if ((min && val < *min) || (max && val > *max))
2478 continue;
2479 *i = val;
2480 } else {
2481 val = convdiv * (*i) / convmul;
2482 if (!first)
2483 err = proc_put_char(&buffer, &left, '\t');
2484 err = proc_put_long(&buffer, &left, val, false);
2485 if (err)
2486 break;
2487 }
2488 }
2489
2490 if (!write && !first && left && !err)
2491 err = proc_put_char(&buffer, &left, '\n');
2492 if (write && !err)
2493 left -= proc_skip_spaces(&kbuf);
2494 free:
2495 if (write) {
2496 free_page(page);
2497 if (first)
2498 return err ? : -EINVAL;
2499 }
2500 *lenp -= left;
2501 *ppos += *lenp;
2502 return err;
2503 }
2504
2505 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2506 void __user *buffer,
2507 size_t *lenp, loff_t *ppos,
2508 unsigned long convmul,
2509 unsigned long convdiv)
2510 {
2511 return __do_proc_doulongvec_minmax(table->data, table, write,
2512 buffer, lenp, ppos, convmul, convdiv);
2513 }
2514
2515 /**
2516 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2517 * @table: the sysctl table
2518 * @write: %TRUE if this is a write to the sysctl file
2519 * @buffer: the user buffer
2520 * @lenp: the size of the user buffer
2521 * @ppos: file position
2522 *
2523 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2524 * values from/to the user buffer, treated as an ASCII string.
2525 *
2526 * This routine will ensure the values are within the range specified by
2527 * table->extra1 (min) and table->extra2 (max).
2528 *
2529 * Returns 0 on success.
2530 */
2531 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2532 void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2535 }
2536
2537 /**
2538 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2539 * @table: the sysctl table
2540 * @write: %TRUE if this is a write to the sysctl file
2541 * @buffer: the user buffer
2542 * @lenp: the size of the user buffer
2543 * @ppos: file position
2544 *
2545 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2546 * values from/to the user buffer, treated as an ASCII string. The values
2547 * are treated as milliseconds, and converted to jiffies when they are stored.
2548 *
2549 * This routine will ensure the values are within the range specified by
2550 * table->extra1 (min) and table->extra2 (max).
2551 *
2552 * Returns 0 on success.
2553 */
2554 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2555 void __user *buffer,
2556 size_t *lenp, loff_t *ppos)
2557 {
2558 return do_proc_doulongvec_minmax(table, write, buffer,
2559 lenp, ppos, HZ, 1000l);
2560 }
2561
2562
2563 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2564 int *valp,
2565 int write, void *data)
2566 {
2567 if (write) {
2568 if (*lvalp > LONG_MAX / HZ)
2569 return 1;
2570 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2571 } else {
2572 int val = *valp;
2573 unsigned long lval;
2574 if (val < 0) {
2575 *negp = true;
2576 lval = (unsigned long)-val;
2577 } else {
2578 *negp = false;
2579 lval = (unsigned long)val;
2580 }
2581 *lvalp = lval / HZ;
2582 }
2583 return 0;
2584 }
2585
2586 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2587 int *valp,
2588 int write, void *data)
2589 {
2590 if (write) {
2591 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2592 return 1;
2593 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2594 } else {
2595 int val = *valp;
2596 unsigned long lval;
2597 if (val < 0) {
2598 *negp = true;
2599 lval = (unsigned long)-val;
2600 } else {
2601 *negp = false;
2602 lval = (unsigned long)val;
2603 }
2604 *lvalp = jiffies_to_clock_t(lval);
2605 }
2606 return 0;
2607 }
2608
2609 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2610 int *valp,
2611 int write, void *data)
2612 {
2613 if (write) {
2614 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2615 } else {
2616 int val = *valp;
2617 unsigned long lval;
2618 if (val < 0) {
2619 *negp = true;
2620 lval = (unsigned long)-val;
2621 } else {
2622 *negp = false;
2623 lval = (unsigned long)val;
2624 }
2625 *lvalp = jiffies_to_msecs(lval);
2626 }
2627 return 0;
2628 }
2629
2630 /**
2631 * proc_dointvec_jiffies - read a vector of integers as seconds
2632 * @table: the sysctl table
2633 * @write: %TRUE if this is a write to the sysctl file
2634 * @buffer: the user buffer
2635 * @lenp: the size of the user buffer
2636 * @ppos: file position
2637 *
2638 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2639 * values from/to the user buffer, treated as an ASCII string.
2640 * The values read are assumed to be in seconds, and are converted into
2641 * jiffies.
2642 *
2643 * Returns 0 on success.
2644 */
2645 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2646 void __user *buffer, size_t *lenp, loff_t *ppos)
2647 {
2648 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2649 do_proc_dointvec_jiffies_conv,NULL);
2650 }
2651
2652 /**
2653 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2654 * @table: the sysctl table
2655 * @write: %TRUE if this is a write to the sysctl file
2656 * @buffer: the user buffer
2657 * @lenp: the size of the user buffer
2658 * @ppos: pointer to the file position
2659 *
2660 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2661 * values from/to the user buffer, treated as an ASCII string.
2662 * The values read are assumed to be in 1/USER_HZ seconds, and
2663 * are converted into jiffies.
2664 *
2665 * Returns 0 on success.
2666 */
2667 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2669 {
2670 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2671 do_proc_dointvec_userhz_jiffies_conv,NULL);
2672 }
2673
2674 /**
2675 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2676 * @table: the sysctl table
2677 * @write: %TRUE if this is a write to the sysctl file
2678 * @buffer: the user buffer
2679 * @lenp: the size of the user buffer
2680 * @ppos: file position
2681 * @ppos: the current position in the file
2682 *
2683 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2684 * values from/to the user buffer, treated as an ASCII string.
2685 * The values read are assumed to be in 1/1000 seconds, and
2686 * are converted into jiffies.
2687 *
2688 * Returns 0 on success.
2689 */
2690 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2691 void __user *buffer, size_t *lenp, loff_t *ppos)
2692 {
2693 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2694 do_proc_dointvec_ms_jiffies_conv, NULL);
2695 }
2696
2697 static int proc_do_cad_pid(struct ctl_table *table, int write,
2698 void __user *buffer, size_t *lenp, loff_t *ppos)
2699 {
2700 struct pid *new_pid;
2701 pid_t tmp;
2702 int r;
2703
2704 tmp = pid_vnr(cad_pid);
2705
2706 r = __do_proc_dointvec(&tmp, table, write, buffer,
2707 lenp, ppos, NULL, NULL);
2708 if (r || !write)
2709 return r;
2710
2711 new_pid = find_get_pid(tmp);
2712 if (!new_pid)
2713 return -ESRCH;
2714
2715 put_pid(xchg(&cad_pid, new_pid));
2716 return 0;
2717 }
2718
2719 /**
2720 * proc_do_large_bitmap - read/write from/to a large bitmap
2721 * @table: the sysctl table
2722 * @write: %TRUE if this is a write to the sysctl file
2723 * @buffer: the user buffer
2724 * @lenp: the size of the user buffer
2725 * @ppos: file position
2726 *
2727 * The bitmap is stored at table->data and the bitmap length (in bits)
2728 * in table->maxlen.
2729 *
2730 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2731 * large bitmaps may be represented in a compact manner. Writing into
2732 * the file will clear the bitmap then update it with the given input.
2733 *
2734 * Returns 0 on success.
2735 */
2736 int proc_do_large_bitmap(struct ctl_table *table, int write,
2737 void __user *buffer, size_t *lenp, loff_t *ppos)
2738 {
2739 int err = 0;
2740 bool first = 1;
2741 size_t left = *lenp;
2742 unsigned long bitmap_len = table->maxlen;
2743 unsigned long *bitmap = (unsigned long *) table->data;
2744 unsigned long *tmp_bitmap = NULL;
2745 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2746
2747 if (!bitmap_len || !left || (*ppos && !write)) {
2748 *lenp = 0;
2749 return 0;
2750 }
2751
2752 if (write) {
2753 unsigned long page = 0;
2754 char *kbuf;
2755
2756 if (left > PAGE_SIZE - 1)
2757 left = PAGE_SIZE - 1;
2758
2759 page = __get_free_page(GFP_TEMPORARY);
2760 kbuf = (char *) page;
2761 if (!kbuf)
2762 return -ENOMEM;
2763 if (copy_from_user(kbuf, buffer, left)) {
2764 free_page(page);
2765 return -EFAULT;
2766 }
2767 kbuf[left] = 0;
2768
2769 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2770 GFP_KERNEL);
2771 if (!tmp_bitmap) {
2772 free_page(page);
2773 return -ENOMEM;
2774 }
2775 proc_skip_char(&kbuf, &left, '\n');
2776 while (!err && left) {
2777 unsigned long val_a, val_b;
2778 bool neg;
2779
2780 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2781 sizeof(tr_a), &c);
2782 if (err)
2783 break;
2784 if (val_a >= bitmap_len || neg) {
2785 err = -EINVAL;
2786 break;
2787 }
2788
2789 val_b = val_a;
2790 if (left) {
2791 kbuf++;
2792 left--;
2793 }
2794
2795 if (c == '-') {
2796 err = proc_get_long(&kbuf, &left, &val_b,
2797 &neg, tr_b, sizeof(tr_b),
2798 &c);
2799 if (err)
2800 break;
2801 if (val_b >= bitmap_len || neg ||
2802 val_a > val_b) {
2803 err = -EINVAL;
2804 break;
2805 }
2806 if (left) {
2807 kbuf++;
2808 left--;
2809 }
2810 }
2811
2812 while (val_a <= val_b)
2813 set_bit(val_a++, tmp_bitmap);
2814
2815 first = 0;
2816 proc_skip_char(&kbuf, &left, '\n');
2817 }
2818 free_page(page);
2819 } else {
2820 unsigned long bit_a, bit_b = 0;
2821
2822 while (left) {
2823 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2824 if (bit_a >= bitmap_len)
2825 break;
2826 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2827 bit_a + 1) - 1;
2828
2829 if (!first) {
2830 err = proc_put_char(&buffer, &left, ',');
2831 if (err)
2832 break;
2833 }
2834 err = proc_put_long(&buffer, &left, bit_a, false);
2835 if (err)
2836 break;
2837 if (bit_a != bit_b) {
2838 err = proc_put_char(&buffer, &left, '-');
2839 if (err)
2840 break;
2841 err = proc_put_long(&buffer, &left, bit_b, false);
2842 if (err)
2843 break;
2844 }
2845
2846 first = 0; bit_b++;
2847 }
2848 if (!err)
2849 err = proc_put_char(&buffer, &left, '\n');
2850 }
2851
2852 if (!err) {
2853 if (write) {
2854 if (*ppos)
2855 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2856 else
2857 memcpy(bitmap, tmp_bitmap,
2858 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2859 }
2860 kfree(tmp_bitmap);
2861 *lenp -= left;
2862 *ppos += *lenp;
2863 return 0;
2864 } else {
2865 kfree(tmp_bitmap);
2866 return err;
2867 }
2868 }
2869
2870 #else /* CONFIG_PROC_FS */
2871
2872 int proc_dostring(struct ctl_table *table, int write,
2873 void __user *buffer, size_t *lenp, loff_t *ppos)
2874 {
2875 return -ENOSYS;
2876 }
2877
2878 int proc_dointvec(struct ctl_table *table, int write,
2879 void __user *buffer, size_t *lenp, loff_t *ppos)
2880 {
2881 return -ENOSYS;
2882 }
2883
2884 int proc_dointvec_minmax(struct ctl_table *table, int write,
2885 void __user *buffer, size_t *lenp, loff_t *ppos)
2886 {
2887 return -ENOSYS;
2888 }
2889
2890 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2891 void __user *buffer, size_t *lenp, loff_t *ppos)
2892 {
2893 return -ENOSYS;
2894 }
2895
2896 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2897 void __user *buffer, size_t *lenp, loff_t *ppos)
2898 {
2899 return -ENOSYS;
2900 }
2901
2902 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2903 void __user *buffer, size_t *lenp, loff_t *ppos)
2904 {
2905 return -ENOSYS;
2906 }
2907
2908 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2909 void __user *buffer, size_t *lenp, loff_t *ppos)
2910 {
2911 return -ENOSYS;
2912 }
2913
2914 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2915 void __user *buffer,
2916 size_t *lenp, loff_t *ppos)
2917 {
2918 return -ENOSYS;
2919 }
2920
2921
2922 #endif /* CONFIG_PROC_FS */
2923
2924 /*
2925 * No sense putting this after each symbol definition, twice,
2926 * exception granted :-)
2927 */
2928 EXPORT_SYMBOL(proc_dointvec);
2929 EXPORT_SYMBOL(proc_dointvec_jiffies);
2930 EXPORT_SYMBOL(proc_dointvec_minmax);
2931 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2932 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2933 EXPORT_SYMBOL(proc_dostring);
2934 EXPORT_SYMBOL(proc_doulongvec_minmax);
2935 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2936 EXPORT_SYMBOL(register_sysctl_table);
2937 EXPORT_SYMBOL(register_sysctl_paths);
2938 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree