?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[linux-2.6/kmemtrace.git] / kernel / sysctl.c
blob8b7e95411795793724f036594e1446e32f1e444b
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/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.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/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/times.h>
42 #include <linux/limits.h>
43 #include <linux/dcache.h>
44 #include <linux/syscalls.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/acpi.h>
47 #include <linux/reboot.h>
48
49 #include <asm/uaccess.h>
50 #include <asm/processor.h>
51
52 #ifdef CONFIG_X86
53 #include <asm/nmi.h>
54 #include <asm/stacktrace.h>
55 #include <asm/io.h>
56 #endif
57
58 static int deprecated_sysctl_warning(struct __sysctl_args *args);
59
60 #if defined(CONFIG_SYSCTL)
61
62 /* External variables not in a header file. */
63 extern int C_A_D;
64 extern int print_fatal_signals;
65 extern int sysctl_overcommit_memory;
66 extern int sysctl_overcommit_ratio;
67 extern int sysctl_panic_on_oom;
68 extern int sysctl_oom_kill_allocating_task;
69 extern int sysctl_oom_dump_tasks;
70 extern int max_threads;
71 extern int core_uses_pid;
72 extern int suid_dumpable;
73 extern char core_pattern[];
74 extern int pid_max;
75 extern int min_free_kbytes;
76 extern int pid_max_min, pid_max_max;
77 extern int sysctl_drop_caches;
78 extern int percpu_pagelist_fraction;
79 extern int compat_log;
80 extern int maps_protect;
81 extern int sysctl_stat_interval;
82 extern int latencytop_enabled;
83
84 /* Constants used for minimum and maximum */
85 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
86 static int one = 1;
87 #endif
88
89 #ifdef CONFIG_DETECT_SOFTLOCKUP
90 static int sixty = 60;
91 #endif
92
93 #ifdef CONFIG_MMU
94 static int two = 2;
95 #endif
96
97 static int zero;
98 static int one_hundred = 100;
99
100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
101 static int maxolduid = 65535;
102 static int minolduid;
103 static int min_percpu_pagelist_fract = 8;
104
105 static int ngroups_max = NGROUPS_MAX;
106
107 #ifdef CONFIG_KMOD
108 extern char modprobe_path[];
109 #endif
110 #ifdef CONFIG_CHR_DEV_SG
111 extern int sg_big_buff;
112 #endif
113
114 #ifdef __sparc__
115 extern char reboot_command [];
116 extern int stop_a_enabled;
117 extern int scons_pwroff;
118 #endif
119
120 #ifdef __hppa__
121 extern int pwrsw_enabled;
122 extern int unaligned_enabled;
123 #endif
124
125 #ifdef CONFIG_S390
126 #ifdef CONFIG_MATHEMU
127 extern int sysctl_ieee_emulation_warnings;
128 #endif
129 extern int sysctl_userprocess_debug;
130 extern int spin_retry;
131 #endif
132
133 extern int sysctl_hz_timer;
134
135 #ifdef CONFIG_BSD_PROCESS_ACCT
136 extern int acct_parm[];
137 #endif
138
139 #ifdef CONFIG_IA64
140 extern int no_unaligned_warning;
141 #endif
142
143 #ifdef CONFIG_RT_MUTEXES
144 extern int max_lock_depth;
145 #endif
146
147 #ifdef CONFIG_SYSCTL_SYSCALL
148 static int parse_table(int __user *, int, void __user *, size_t __user *,
149 void __user *, size_t, struct ctl_table *);
150 #endif
151
152
153 #ifdef CONFIG_PROC_SYSCTL
154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
155 void __user *buffer, size_t *lenp, loff_t *ppos);
156 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
157 void __user *buffer, size_t *lenp, loff_t *ppos);
158 #endif
159
160 static struct ctl_table root_table[];
161 static struct ctl_table_root sysctl_table_root;
162 static struct ctl_table_header root_table_header = {
163 .ctl_table = root_table,
164 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
165 .root = &sysctl_table_root,
166 };
167 static struct ctl_table_root sysctl_table_root = {
168 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
169 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
170 };
171
172 static struct ctl_table kern_table[];
173 static struct ctl_table vm_table[];
174 static struct ctl_table fs_table[];
175 static struct ctl_table debug_table[];
176 static struct ctl_table dev_table[];
177 extern struct ctl_table random_table[];
178 #ifdef CONFIG_INOTIFY_USER
179 extern struct ctl_table inotify_table[];
180 #endif
181
182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
183 int sysctl_legacy_va_layout;
184 #endif
185
186 extern int prove_locking;
187 extern int lock_stat;
188
189 /* The default sysctl tables: */
190
191 static struct ctl_table root_table[] = {
192 {
193 .ctl_name = CTL_KERN,
194 .procname = "kernel",
195 .mode = 0555,
196 .child = kern_table,
197 },
198 {
199 .ctl_name = CTL_VM,
200 .procname = "vm",
201 .mode = 0555,
202 .child = vm_table,
203 },
204 {
205 .ctl_name = CTL_FS,
206 .procname = "fs",
207 .mode = 0555,
208 .child = fs_table,
209 },
210 {
211 .ctl_name = CTL_DEBUG,
212 .procname = "debug",
213 .mode = 0555,
214 .child = debug_table,
215 },
216 {
217 .ctl_name = CTL_DEV,
218 .procname = "dev",
219 .mode = 0555,
220 .child = dev_table,
221 },
222 /*
223 * NOTE: do not add new entries to this table unless you have read
224 * Documentation/sysctl/ctl_unnumbered.txt
225 */
226 { .ctl_name = 0 }
227 };
228
229 #ifdef CONFIG_SCHED_DEBUG
230 static int min_sched_granularity_ns = 100000; /* 100 usecs */
231 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
232 static int min_wakeup_granularity_ns; /* 0 usecs */
233 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
234 #endif
235
236 static struct ctl_table kern_table[] = {
237 #ifdef CONFIG_SCHED_DEBUG
238 {
239 .ctl_name = CTL_UNNUMBERED,
240 .procname = "sched_min_granularity_ns",
241 .data = &sysctl_sched_min_granularity,
242 .maxlen = sizeof(unsigned int),
243 .mode = 0644,
244 .proc_handler = &sched_nr_latency_handler,
245 .strategy = &sysctl_intvec,
246 .extra1 = &min_sched_granularity_ns,
247 .extra2 = &max_sched_granularity_ns,
248 },
249 {
250 .ctl_name = CTL_UNNUMBERED,
251 .procname = "sched_latency_ns",
252 .data = &sysctl_sched_latency,
253 .maxlen = sizeof(unsigned int),
254 .mode = 0644,
255 .proc_handler = &sched_nr_latency_handler,
256 .strategy = &sysctl_intvec,
257 .extra1 = &min_sched_granularity_ns,
258 .extra2 = &max_sched_granularity_ns,
259 },
260 {
261 .ctl_name = CTL_UNNUMBERED,
262 .procname = "sched_wakeup_granularity_ns",
263 .data = &sysctl_sched_wakeup_granularity,
264 .maxlen = sizeof(unsigned int),
265 .mode = 0644,
266 .proc_handler = &proc_dointvec_minmax,
267 .strategy = &sysctl_intvec,
268 .extra1 = &min_wakeup_granularity_ns,
269 .extra2 = &max_wakeup_granularity_ns,
270 },
271 {
272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_batch_wakeup_granularity_ns",
274 .data = &sysctl_sched_batch_wakeup_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = &proc_dointvec_minmax,
278 .strategy = &sysctl_intvec,
279 .extra1 = &min_wakeup_granularity_ns,
280 .extra2 = &max_wakeup_granularity_ns,
281 },
282 {
283 .ctl_name = CTL_UNNUMBERED,
284 .procname = "sched_child_runs_first",
285 .data = &sysctl_sched_child_runs_first,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec,
289 },
290 {
291 .ctl_name = CTL_UNNUMBERED,
292 .procname = "sched_features",
293 .data = &sysctl_sched_features,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec,
297 },
298 {
299 .ctl_name = CTL_UNNUMBERED,
300 .procname = "sched_migration_cost",
301 .data = &sysctl_sched_migration_cost,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
306 {
307 .ctl_name = CTL_UNNUMBERED,
308 .procname = "sched_nr_migrate",
309 .data = &sysctl_sched_nr_migrate,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = &proc_dointvec,
313 },
314 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
315 {
316 .ctl_name = CTL_UNNUMBERED,
317 .procname = "sched_min_bal_int_shares",
318 .data = &sysctl_sched_min_bal_int_shares,
319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
321 .proc_handler = &proc_dointvec,
322 },
323 {
324 .ctl_name = CTL_UNNUMBERED,
325 .procname = "sched_max_bal_int_shares",
326 .data = &sysctl_sched_max_bal_int_shares,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = &proc_dointvec,
330 },
331 #endif
332 #endif
333 {
334 .ctl_name = CTL_UNNUMBERED,
335 .procname = "sched_rt_period_us",
336 .data = &sysctl_sched_rt_period,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = &proc_dointvec,
340 },
341 {
342 .ctl_name = CTL_UNNUMBERED,
343 .procname = "sched_rt_runtime_us",
344 .data = &sysctl_sched_rt_runtime,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = &proc_dointvec,
348 },
349 {
350 .ctl_name = CTL_UNNUMBERED,
351 .procname = "sched_compat_yield",
352 .data = &sysctl_sched_compat_yield,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = &proc_dointvec,
356 },
357 #ifdef CONFIG_PROVE_LOCKING
358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "prove_locking",
361 .data = &prove_locking,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = &proc_dointvec,
365 },
366 #endif
367 #ifdef CONFIG_LOCK_STAT
368 {
369 .ctl_name = CTL_UNNUMBERED,
370 .procname = "lock_stat",
371 .data = &lock_stat,
372 .maxlen = sizeof(int),
373 .mode = 0644,
374 .proc_handler = &proc_dointvec,
375 },
376 #endif
377 {
378 .ctl_name = KERN_PANIC,
379 .procname = "panic",
380 .data = &panic_timeout,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = &proc_dointvec,
384 },
385 {
386 .ctl_name = KERN_CORE_USES_PID,
387 .procname = "core_uses_pid",
388 .data = &core_uses_pid,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = &proc_dointvec,
392 },
393 {
394 .ctl_name = KERN_CORE_PATTERN,
395 .procname = "core_pattern",
396 .data = core_pattern,
397 .maxlen = CORENAME_MAX_SIZE,
398 .mode = 0644,
399 .proc_handler = &proc_dostring,
400 .strategy = &sysctl_string,
401 },
402 #ifdef CONFIG_PROC_SYSCTL
403 {
404 .procname = "tainted",
405 .data = &tainted,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = &proc_dointvec_taint,
409 },
410 #endif
411 #ifdef CONFIG_LATENCYTOP
412 {
413 .procname = "latencytop",
414 .data = &latencytop_enabled,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = &proc_dointvec,
418 },
419 #endif
420 #ifdef CONFIG_BLK_DEV_INITRD
421 {
422 .ctl_name = KERN_REALROOTDEV,
423 .procname = "real-root-dev",
424 .data = &real_root_dev,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = &proc_dointvec,
428 },
429 #endif
430 {
431 .ctl_name = CTL_UNNUMBERED,
432 .procname = "print-fatal-signals",
433 .data = &print_fatal_signals,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = &proc_dointvec,
437 },
438 #ifdef __sparc__
439 {
440 .ctl_name = KERN_SPARC_REBOOT,
441 .procname = "reboot-cmd",
442 .data = reboot_command,
443 .maxlen = 256,
444 .mode = 0644,
445 .proc_handler = &proc_dostring,
446 .strategy = &sysctl_string,
447 },
448 {
449 .ctl_name = KERN_SPARC_STOP_A,
450 .procname = "stop-a",
451 .data = &stop_a_enabled,
452 .maxlen = sizeof (int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456 {
457 .ctl_name = KERN_SPARC_SCONS_PWROFF,
458 .procname = "scons-poweroff",
459 .data = &scons_pwroff,
460 .maxlen = sizeof (int),
461 .mode = 0644,
462 .proc_handler = &proc_dointvec,
463 },
464 #endif
465 #ifdef __hppa__
466 {
467 .ctl_name = KERN_HPPA_PWRSW,
468 .procname = "soft-power",
469 .data = &pwrsw_enabled,
470 .maxlen = sizeof (int),
471 .mode = 0644,
472 .proc_handler = &proc_dointvec,
473 },
474 {
475 .ctl_name = KERN_HPPA_UNALIGNED,
476 .procname = "unaligned-trap",
477 .data = &unaligned_enabled,
478 .maxlen = sizeof (int),
479 .mode = 0644,
480 .proc_handler = &proc_dointvec,
481 },
482 #endif
483 {
484 .ctl_name = KERN_CTLALTDEL,
485 .procname = "ctrl-alt-del",
486 .data = &C_A_D,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = &proc_dointvec,
490 },
491 #ifdef CONFIG_KMOD
492 {
493 .ctl_name = KERN_MODPROBE,
494 .procname = "modprobe",
495 .data = &modprobe_path,
496 .maxlen = KMOD_PATH_LEN,
497 .mode = 0644,
498 .proc_handler = &proc_dostring,
499 .strategy = &sysctl_string,
500 },
501 #endif
502 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
503 {
504 .ctl_name = KERN_HOTPLUG,
505 .procname = "hotplug",
506 .data = &uevent_helper,
507 .maxlen = UEVENT_HELPER_PATH_LEN,
508 .mode = 0644,
509 .proc_handler = &proc_dostring,
510 .strategy = &sysctl_string,
511 },
512 #endif
513 #ifdef CONFIG_CHR_DEV_SG
514 {
515 .ctl_name = KERN_SG_BIG_BUFF,
516 .procname = "sg-big-buff",
517 .data = &sg_big_buff,
518 .maxlen = sizeof (int),
519 .mode = 0444,
520 .proc_handler = &proc_dointvec,
521 },
522 #endif
523 #ifdef CONFIG_BSD_PROCESS_ACCT
524 {
525 .ctl_name = KERN_ACCT,
526 .procname = "acct",
527 .data = &acct_parm,
528 .maxlen = 3*sizeof(int),
529 .mode = 0644,
530 .proc_handler = &proc_dointvec,
531 },
532 #endif
533 #ifdef CONFIG_MAGIC_SYSRQ
534 {
535 .ctl_name = KERN_SYSRQ,
536 .procname = "sysrq",
537 .data = &__sysrq_enabled,
538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = &proc_dointvec,
541 },
542 #endif
543 #ifdef CONFIG_PROC_SYSCTL
544 {
545 .procname = "cad_pid",
546 .data = NULL,
547 .maxlen = sizeof (int),
548 .mode = 0600,
549 .proc_handler = &proc_do_cad_pid,
550 },
551 #endif
552 {
553 .ctl_name = KERN_MAX_THREADS,
554 .procname = "threads-max",
555 .data = &max_threads,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = &proc_dointvec,
559 },
560 {
561 .ctl_name = KERN_RANDOM,
562 .procname = "random",
563 .mode = 0555,
564 .child = random_table,
565 },
566 {
567 .ctl_name = KERN_OVERFLOWUID,
568 .procname = "overflowuid",
569 .data = &overflowuid,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = &proc_dointvec_minmax,
573 .strategy = &sysctl_intvec,
574 .extra1 = &minolduid,
575 .extra2 = &maxolduid,
576 },
577 {
578 .ctl_name = KERN_OVERFLOWGID,
579 .procname = "overflowgid",
580 .data = &overflowgid,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = &proc_dointvec_minmax,
584 .strategy = &sysctl_intvec,
585 .extra1 = &minolduid,
586 .extra2 = &maxolduid,
587 },
588 #ifdef CONFIG_S390
589 #ifdef CONFIG_MATHEMU
590 {
591 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
592 .procname = "ieee_emulation_warnings",
593 .data = &sysctl_ieee_emulation_warnings,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = &proc_dointvec,
597 },
598 #endif
599 #ifdef CONFIG_NO_IDLE_HZ
600 {
601 .ctl_name = KERN_HZ_TIMER,
602 .procname = "hz_timer",
603 .data = &sysctl_hz_timer,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec,
607 },
608 #endif
609 {
610 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
611 .procname = "userprocess_debug",
612 .data = &sysctl_userprocess_debug,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617 #endif
618 {
619 .ctl_name = KERN_PIDMAX,
620 .procname = "pid_max",
621 .data = &pid_max,
622 .maxlen = sizeof (int),
623 .mode = 0644,
624 .proc_handler = &proc_dointvec_minmax,
625 .strategy = sysctl_intvec,
626 .extra1 = &pid_max_min,
627 .extra2 = &pid_max_max,
628 },
629 {
630 .ctl_name = KERN_PANIC_ON_OOPS,
631 .procname = "panic_on_oops",
632 .data = &panic_on_oops,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = &proc_dointvec,
636 },
637 #if defined CONFIG_PRINTK
638 {
639 .ctl_name = KERN_PRINTK,
640 .procname = "printk",
641 .data = &console_loglevel,
642 .maxlen = 4*sizeof(int),
643 .mode = 0644,
644 .proc_handler = &proc_dointvec,
645 },
646 {
647 .ctl_name = KERN_PRINTK_RATELIMIT,
648 .procname = "printk_ratelimit",
649 .data = &printk_ratelimit_jiffies,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = &proc_dointvec_jiffies,
653 .strategy = &sysctl_jiffies,
654 },
655 {
656 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
657 .procname = "printk_ratelimit_burst",
658 .data = &printk_ratelimit_burst,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec,
662 },
663 #endif
664 {
665 .ctl_name = KERN_NGROUPS_MAX,
666 .procname = "ngroups_max",
667 .data = &ngroups_max,
668 .maxlen = sizeof (int),
669 .mode = 0444,
670 .proc_handler = &proc_dointvec,
671 },
672 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
673 {
674 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
675 .procname = "unknown_nmi_panic",
676 .data = &unknown_nmi_panic,
677 .maxlen = sizeof (int),
678 .mode = 0644,
679 .proc_handler = &proc_dointvec,
680 },
681 {
682 .procname = "nmi_watchdog",
683 .data = &nmi_watchdog_enabled,
684 .maxlen = sizeof (int),
685 .mode = 0644,
686 .proc_handler = &proc_nmi_enabled,
687 },
688 #endif
689 #if defined(CONFIG_X86)
690 {
691 .ctl_name = KERN_PANIC_ON_NMI,
692 .procname = "panic_on_unrecovered_nmi",
693 .data = &panic_on_unrecovered_nmi,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = &proc_dointvec,
697 },
698 {
699 .ctl_name = KERN_BOOTLOADER_TYPE,
700 .procname = "bootloader_type",
701 .data = &bootloader_type,
702 .maxlen = sizeof (int),
703 .mode = 0444,
704 .proc_handler = &proc_dointvec,
705 },
706 {
707 .ctl_name = CTL_UNNUMBERED,
708 .procname = "kstack_depth_to_print",
709 .data = &kstack_depth_to_print,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
714 {
715 .ctl_name = CTL_UNNUMBERED,
716 .procname = "io_delay_type",
717 .data = &io_delay_type,
718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = &proc_dointvec,
721 },
722 #endif
723 #if defined(CONFIG_MMU)
724 {
725 .ctl_name = KERN_RANDOMIZE,
726 .procname = "randomize_va_space",
727 .data = &randomize_va_space,
728 .maxlen = sizeof(int),
729 .mode = 0644,
730 .proc_handler = &proc_dointvec,
731 },
732 #endif
733 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
734 {
735 .ctl_name = KERN_SPIN_RETRY,
736 .procname = "spin_retry",
737 .data = &spin_retry,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = &proc_dointvec,
741 },
742 #endif
743 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
744 {
745 .procname = "acpi_video_flags",
746 .data = &acpi_realmode_flags,
747 .maxlen = sizeof (unsigned long),
748 .mode = 0644,
749 .proc_handler = &proc_doulongvec_minmax,
750 },
751 #endif
752 #ifdef CONFIG_IA64
753 {
754 .ctl_name = KERN_IA64_UNALIGNED,
755 .procname = "ignore-unaligned-usertrap",
756 .data = &no_unaligned_warning,
757 .maxlen = sizeof (int),
758 .mode = 0644,
759 .proc_handler = &proc_dointvec,
760 },
761 #endif
762 #ifdef CONFIG_DETECT_SOFTLOCKUP
763 {
764 .ctl_name = CTL_UNNUMBERED,
765 .procname = "softlockup_thresh",
766 .data = &softlockup_thresh,
767 .maxlen = sizeof(unsigned long),
768 .mode = 0644,
769 .proc_handler = &proc_doulongvec_minmax,
770 .strategy = &sysctl_intvec,
771 .extra1 = &one,
772 .extra2 = &sixty,
773 },
774 {
775 .ctl_name = CTL_UNNUMBERED,
776 .procname = "hung_task_check_count",
777 .data = &sysctl_hung_task_check_count,
778 .maxlen = sizeof(unsigned long),
779 .mode = 0644,
780 .proc_handler = &proc_doulongvec_minmax,
781 .strategy = &sysctl_intvec,
782 },
783 {
784 .ctl_name = CTL_UNNUMBERED,
785 .procname = "hung_task_timeout_secs",
786 .data = &sysctl_hung_task_timeout_secs,
787 .maxlen = sizeof(unsigned long),
788 .mode = 0644,
789 .proc_handler = &proc_doulongvec_minmax,
790 .strategy = &sysctl_intvec,
791 },
792 {
793 .ctl_name = CTL_UNNUMBERED,
794 .procname = "hung_task_warnings",
795 .data = &sysctl_hung_task_warnings,
796 .maxlen = sizeof(unsigned long),
797 .mode = 0644,
798 .proc_handler = &proc_doulongvec_minmax,
799 .strategy = &sysctl_intvec,
800 },
801 #endif
802 #ifdef CONFIG_COMPAT
803 {
804 .ctl_name = KERN_COMPAT_LOG,
805 .procname = "compat-log",
806 .data = &compat_log,
807 .maxlen = sizeof (int),
808 .mode = 0644,
809 .proc_handler = &proc_dointvec,
810 },
811 #endif
812 #ifdef CONFIG_RT_MUTEXES
813 {
814 .ctl_name = KERN_MAX_LOCK_DEPTH,
815 .procname = "max_lock_depth",
816 .data = &max_lock_depth,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = &proc_dointvec,
820 },
821 #endif
822 #ifdef CONFIG_PROC_FS
823 {
824 .ctl_name = CTL_UNNUMBERED,
825 .procname = "maps_protect",
826 .data = &maps_protect,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = &proc_dointvec,
830 },
831 #endif
832 {
833 .ctl_name = CTL_UNNUMBERED,
834 .procname = "poweroff_cmd",
835 .data = &poweroff_cmd,
836 .maxlen = POWEROFF_CMD_PATH_LEN,
837 .mode = 0644,
838 .proc_handler = &proc_dostring,
839 .strategy = &sysctl_string,
840 },
841 /*
842 * NOTE: do not add new entries to this table unless you have read
843 * Documentation/sysctl/ctl_unnumbered.txt
844 */
845 { .ctl_name = 0 }
846 };
847
848 static struct ctl_table vm_table[] = {
849 {
850 .ctl_name = VM_OVERCOMMIT_MEMORY,
851 .procname = "overcommit_memory",
852 .data = &sysctl_overcommit_memory,
853 .maxlen = sizeof(sysctl_overcommit_memory),
854 .mode = 0644,
855 .proc_handler = &proc_dointvec,
856 },
857 {
858 .ctl_name = VM_PANIC_ON_OOM,
859 .procname = "panic_on_oom",
860 .data = &sysctl_panic_on_oom,
861 .maxlen = sizeof(sysctl_panic_on_oom),
862 .mode = 0644,
863 .proc_handler = &proc_dointvec,
864 },
865 {
866 .ctl_name = CTL_UNNUMBERED,
867 .procname = "oom_kill_allocating_task",
868 .data = &sysctl_oom_kill_allocating_task,
869 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
870 .mode = 0644,
871 .proc_handler = &proc_dointvec,
872 },
873 {
874 .ctl_name = CTL_UNNUMBERED,
875 .procname = "oom_dump_tasks",
876 .data = &sysctl_oom_dump_tasks,
877 .maxlen = sizeof(sysctl_oom_dump_tasks),
878 .mode = 0644,
879 .proc_handler = &proc_dointvec,
880 },
881 {
882 .ctl_name = VM_OVERCOMMIT_RATIO,
883 .procname = "overcommit_ratio",
884 .data = &sysctl_overcommit_ratio,
885 .maxlen = sizeof(sysctl_overcommit_ratio),
886 .mode = 0644,
887 .proc_handler = &proc_dointvec,
888 },
889 {
890 .ctl_name = VM_PAGE_CLUSTER,
891 .procname = "page-cluster",
892 .data = &page_cluster,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = &proc_dointvec,
896 },
897 {
898 .ctl_name = VM_DIRTY_BACKGROUND,
899 .procname = "dirty_background_ratio",
900 .data = &dirty_background_ratio,
901 .maxlen = sizeof(dirty_background_ratio),
902 .mode = 0644,
903 .proc_handler = &proc_dointvec_minmax,
904 .strategy = &sysctl_intvec,
905 .extra1 = &zero,
906 .extra2 = &one_hundred,
907 },
908 {
909 .ctl_name = VM_DIRTY_RATIO,
910 .procname = "dirty_ratio",
911 .data = &vm_dirty_ratio,
912 .maxlen = sizeof(vm_dirty_ratio),
913 .mode = 0644,
914 .proc_handler = &dirty_ratio_handler,
915 .strategy = &sysctl_intvec,
916 .extra1 = &zero,
917 .extra2 = &one_hundred,
918 },
919 {
920 .procname = "dirty_writeback_centisecs",
921 .data = &dirty_writeback_interval,
922 .maxlen = sizeof(dirty_writeback_interval),
923 .mode = 0644,
924 .proc_handler = &dirty_writeback_centisecs_handler,
925 },
926 {
927 .procname = "dirty_expire_centisecs",
928 .data = &dirty_expire_interval,
929 .maxlen = sizeof(dirty_expire_interval),
930 .mode = 0644,
931 .proc_handler = &proc_dointvec_userhz_jiffies,
932 },
933 {
934 .ctl_name = VM_NR_PDFLUSH_THREADS,
935 .procname = "nr_pdflush_threads",
936 .data = &nr_pdflush_threads,
937 .maxlen = sizeof nr_pdflush_threads,
938 .mode = 0444 /* read-only*/,
939 .proc_handler = &proc_dointvec,
940 },
941 {
942 .ctl_name = VM_SWAPPINESS,
943 .procname = "swappiness",
944 .data = &vm_swappiness,
945 .maxlen = sizeof(vm_swappiness),
946 .mode = 0644,
947 .proc_handler = &proc_dointvec_minmax,
948 .strategy = &sysctl_intvec,
949 .extra1 = &zero,
950 .extra2 = &one_hundred,
951 },
952 #ifdef CONFIG_HUGETLB_PAGE
953 {
954 .procname = "nr_hugepages",
955 .data = &max_huge_pages,
956 .maxlen = sizeof(unsigned long),
957 .mode = 0644,
958 .proc_handler = &hugetlb_sysctl_handler,
959 .extra1 = (void *)&hugetlb_zero,
960 .extra2 = (void *)&hugetlb_infinity,
961 },
962 {
963 .ctl_name = VM_HUGETLB_GROUP,
964 .procname = "hugetlb_shm_group",
965 .data = &sysctl_hugetlb_shm_group,
966 .maxlen = sizeof(gid_t),
967 .mode = 0644,
968 .proc_handler = &proc_dointvec,
969 },
970 {
971 .ctl_name = CTL_UNNUMBERED,
972 .procname = "hugepages_treat_as_movable",
973 .data = &hugepages_treat_as_movable,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = &hugetlb_treat_movable_handler,
977 },
978 {
979 .ctl_name = CTL_UNNUMBERED,
980 .procname = "nr_overcommit_hugepages",
981 .data = &sysctl_overcommit_huge_pages,
982 .maxlen = sizeof(sysctl_overcommit_huge_pages),
983 .mode = 0644,
984 .proc_handler = &hugetlb_overcommit_handler,
985 },
986 #endif
987 {
988 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
989 .procname = "lowmem_reserve_ratio",
990 .data = &sysctl_lowmem_reserve_ratio,
991 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
992 .mode = 0644,
993 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
994 .strategy = &sysctl_intvec,
995 },
996 {
997 .ctl_name = VM_DROP_PAGECACHE,
998 .procname = "drop_caches",
999 .data = &sysctl_drop_caches,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = drop_caches_sysctl_handler,
1003 .strategy = &sysctl_intvec,
1004 },
1005 {
1006 .ctl_name = VM_MIN_FREE_KBYTES,
1007 .procname = "min_free_kbytes",
1008 .data = &min_free_kbytes,
1009 .maxlen = sizeof(min_free_kbytes),
1010 .mode = 0644,
1011 .proc_handler = &min_free_kbytes_sysctl_handler,
1012 .strategy = &sysctl_intvec,
1013 .extra1 = &zero,
1014 },
1015 {
1016 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1017 .procname = "percpu_pagelist_fraction",
1018 .data = &percpu_pagelist_fraction,
1019 .maxlen = sizeof(percpu_pagelist_fraction),
1020 .mode = 0644,
1021 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1022 .strategy = &sysctl_intvec,
1023 .extra1 = &min_percpu_pagelist_fract,
1024 },
1025 #ifdef CONFIG_MMU
1026 {
1027 .ctl_name = VM_MAX_MAP_COUNT,
1028 .procname = "max_map_count",
1029 .data = &sysctl_max_map_count,
1030 .maxlen = sizeof(sysctl_max_map_count),
1031 .mode = 0644,
1032 .proc_handler = &proc_dointvec
1033 },
1034 #endif
1035 {
1036 .ctl_name = VM_LAPTOP_MODE,
1037 .procname = "laptop_mode",
1038 .data = &laptop_mode,
1039 .maxlen = sizeof(laptop_mode),
1040 .mode = 0644,
1041 .proc_handler = &proc_dointvec_jiffies,
1042 .strategy = &sysctl_jiffies,
1043 },
1044 {
1045 .ctl_name = VM_BLOCK_DUMP,
1046 .procname = "block_dump",
1047 .data = &block_dump,
1048 .maxlen = sizeof(block_dump),
1049 .mode = 0644,
1050 .proc_handler = &proc_dointvec,
1051 .strategy = &sysctl_intvec,
1052 .extra1 = &zero,
1053 },
1054 {
1055 .ctl_name = VM_VFS_CACHE_PRESSURE,
1056 .procname = "vfs_cache_pressure",
1057 .data = &sysctl_vfs_cache_pressure,
1058 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1059 .mode = 0644,
1060 .proc_handler = &proc_dointvec,
1061 .strategy = &sysctl_intvec,
1062 .extra1 = &zero,
1063 },
1064 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1065 {
1066 .ctl_name = VM_LEGACY_VA_LAYOUT,
1067 .procname = "legacy_va_layout",
1068 .data = &sysctl_legacy_va_layout,
1069 .maxlen = sizeof(sysctl_legacy_va_layout),
1070 .mode = 0644,
1071 .proc_handler = &proc_dointvec,
1072 .strategy = &sysctl_intvec,
1073 .extra1 = &zero,
1074 },
1075 #endif
1076 #ifdef CONFIG_NUMA
1077 {
1078 .ctl_name = VM_ZONE_RECLAIM_MODE,
1079 .procname = "zone_reclaim_mode",
1080 .data = &zone_reclaim_mode,
1081 .maxlen = sizeof(zone_reclaim_mode),
1082 .mode = 0644,
1083 .proc_handler = &proc_dointvec,
1084 .strategy = &sysctl_intvec,
1085 .extra1 = &zero,
1086 },
1087 {
1088 .ctl_name = VM_MIN_UNMAPPED,
1089 .procname = "min_unmapped_ratio",
1090 .data = &sysctl_min_unmapped_ratio,
1091 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1092 .mode = 0644,
1093 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1094 .strategy = &sysctl_intvec,
1095 .extra1 = &zero,
1096 .extra2 = &one_hundred,
1097 },
1098 {
1099 .ctl_name = VM_MIN_SLAB,
1100 .procname = "min_slab_ratio",
1101 .data = &sysctl_min_slab_ratio,
1102 .maxlen = sizeof(sysctl_min_slab_ratio),
1103 .mode = 0644,
1104 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1105 .strategy = &sysctl_intvec,
1106 .extra1 = &zero,
1107 .extra2 = &one_hundred,
1108 },
1109 #endif
1110 #ifdef CONFIG_SMP
1111 {
1112 .ctl_name = CTL_UNNUMBERED,
1113 .procname = "stat_interval",
1114 .data = &sysctl_stat_interval,
1115 .maxlen = sizeof(sysctl_stat_interval),
1116 .mode = 0644,
1117 .proc_handler = &proc_dointvec_jiffies,
1118 .strategy = &sysctl_jiffies,
1119 },
1120 #endif
1121 #ifdef CONFIG_SECURITY
1122 {
1123 .ctl_name = CTL_UNNUMBERED,
1124 .procname = "mmap_min_addr",
1125 .data = &mmap_min_addr,
1126 .maxlen = sizeof(unsigned long),
1127 .mode = 0644,
1128 .proc_handler = &proc_doulongvec_minmax,
1129 },
1130 #endif
1131 #ifdef CONFIG_NUMA
1132 {
1133 .ctl_name = CTL_UNNUMBERED,
1134 .procname = "numa_zonelist_order",
1135 .data = &numa_zonelist_order,
1136 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1137 .mode = 0644,
1138 .proc_handler = &numa_zonelist_order_handler,
1139 .strategy = &sysctl_string,
1140 },
1141 #endif
1142 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1143 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1144 {
1145 .ctl_name = VM_VDSO_ENABLED,
1146 .procname = "vdso_enabled",
1147 .data = &vdso_enabled,
1148 .maxlen = sizeof(vdso_enabled),
1149 .mode = 0644,
1150 .proc_handler = &proc_dointvec,
1151 .strategy = &sysctl_intvec,
1152 .extra1 = &zero,
1153 },
1154 #endif
1155 #ifdef CONFIG_HIGHMEM
1156 {
1157 .ctl_name = CTL_UNNUMBERED,
1158 .procname = "highmem_is_dirtyable",
1159 .data = &vm_highmem_is_dirtyable,
1160 .maxlen = sizeof(vm_highmem_is_dirtyable),
1161 .mode = 0644,
1162 .proc_handler = &proc_dointvec_minmax,
1163 .strategy = &sysctl_intvec,
1164 .extra1 = &zero,
1165 .extra2 = &one,
1166 },
1167 #endif
1168 /*
1169 * NOTE: do not add new entries to this table unless you have read
1170 * Documentation/sysctl/ctl_unnumbered.txt
1171 */
1172 { .ctl_name = 0 }
1173 };
1174
1175 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1176 static struct ctl_table binfmt_misc_table[] = {
1177 { .ctl_name = 0 }
1178 };
1179 #endif
1180
1181 static struct ctl_table fs_table[] = {
1182 {
1183 .ctl_name = FS_NRINODE,
1184 .procname = "inode-nr",
1185 .data = &inodes_stat,
1186 .maxlen = 2*sizeof(int),
1187 .mode = 0444,
1188 .proc_handler = &proc_dointvec,
1189 },
1190 {
1191 .ctl_name = FS_STATINODE,
1192 .procname = "inode-state",
1193 .data = &inodes_stat,
1194 .maxlen = 7*sizeof(int),
1195 .mode = 0444,
1196 .proc_handler = &proc_dointvec,
1197 },
1198 {
1199 .procname = "file-nr",
1200 .data = &files_stat,
1201 .maxlen = 3*sizeof(int),
1202 .mode = 0444,
1203 .proc_handler = &proc_nr_files,
1204 },
1205 {
1206 .ctl_name = FS_MAXFILE,
1207 .procname = "file-max",
1208 .data = &files_stat.max_files,
1209 .maxlen = sizeof(int),
1210 .mode = 0644,
1211 .proc_handler = &proc_dointvec,
1212 },
1213 {
1214 .ctl_name = CTL_UNNUMBERED,
1215 .procname = "nr_open",
1216 .data = &sysctl_nr_open,
1217 .maxlen = sizeof(int),
1218 .mode = 0644,
1219 .proc_handler = &proc_dointvec,
1220 },
1221 {
1222 .ctl_name = FS_DENTRY,
1223 .procname = "dentry-state",
1224 .data = &dentry_stat,
1225 .maxlen = 6*sizeof(int),
1226 .mode = 0444,
1227 .proc_handler = &proc_dointvec,
1228 },
1229 {
1230 .ctl_name = FS_OVERFLOWUID,
1231 .procname = "overflowuid",
1232 .data = &fs_overflowuid,
1233 .maxlen = sizeof(int),
1234 .mode = 0644,
1235 .proc_handler = &proc_dointvec_minmax,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &minolduid,
1238 .extra2 = &maxolduid,
1239 },
1240 {
1241 .ctl_name = FS_OVERFLOWGID,
1242 .procname = "overflowgid",
1243 .data = &fs_overflowgid,
1244 .maxlen = sizeof(int),
1245 .mode = 0644,
1246 .proc_handler = &proc_dointvec_minmax,
1247 .strategy = &sysctl_intvec,
1248 .extra1 = &minolduid,
1249 .extra2 = &maxolduid,
1250 },
1251 {
1252 .ctl_name = FS_LEASES,
1253 .procname = "leases-enable",
1254 .data = &leases_enable,
1255 .maxlen = sizeof(int),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec,
1258 },
1259 #ifdef CONFIG_DNOTIFY
1260 {
1261 .ctl_name = FS_DIR_NOTIFY,
1262 .procname = "dir-notify-enable",
1263 .data = &dir_notify_enable,
1264 .maxlen = sizeof(int),
1265 .mode = 0644,
1266 .proc_handler = &proc_dointvec,
1267 },
1268 #endif
1269 #ifdef CONFIG_MMU
1270 {
1271 .ctl_name = FS_LEASE_TIME,
1272 .procname = "lease-break-time",
1273 .data = &lease_break_time,
1274 .maxlen = sizeof(int),
1275 .mode = 0644,
1276 .proc_handler = &proc_dointvec_minmax,
1277 .strategy = &sysctl_intvec,
1278 .extra1 = &zero,
1279 .extra2 = &two,
1280 },
1281 {
1282 .procname = "aio-nr",
1283 .data = &aio_nr,
1284 .maxlen = sizeof(aio_nr),
1285 .mode = 0444,
1286 .proc_handler = &proc_doulongvec_minmax,
1287 },
1288 {
1289 .procname = "aio-max-nr",
1290 .data = &aio_max_nr,
1291 .maxlen = sizeof(aio_max_nr),
1292 .mode = 0644,
1293 .proc_handler = &proc_doulongvec_minmax,
1294 },
1295 #ifdef CONFIG_INOTIFY_USER
1296 {
1297 .ctl_name = FS_INOTIFY,
1298 .procname = "inotify",
1299 .mode = 0555,
1300 .child = inotify_table,
1301 },
1302 #endif
1303 #endif
1304 {
1305 .ctl_name = KERN_SETUID_DUMPABLE,
1306 .procname = "suid_dumpable",
1307 .data = &suid_dumpable,
1308 .maxlen = sizeof(int),
1309 .mode = 0644,
1310 .proc_handler = &proc_dointvec,
1311 },
1312 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1313 {
1314 .ctl_name = CTL_UNNUMBERED,
1315 .procname = "binfmt_misc",
1316 .mode = 0555,
1317 .child = binfmt_misc_table,
1318 },
1319 #endif
1320 /*
1321 * NOTE: do not add new entries to this table unless you have read
1322 * Documentation/sysctl/ctl_unnumbered.txt
1323 */
1324 { .ctl_name = 0 }
1325 };
1326
1327 static struct ctl_table debug_table[] = {
1328 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1329 {
1330 .ctl_name = CTL_UNNUMBERED,
1331 .procname = "exception-trace",
1332 .data = &show_unhandled_signals,
1333 .maxlen = sizeof(int),
1334 .mode = 0644,
1335 .proc_handler = proc_dointvec
1336 },
1337 #endif
1338 { .ctl_name = 0 }
1339 };
1340
1341 static struct ctl_table dev_table[] = {
1342 { .ctl_name = 0 }
1343 };
1344
1345 static DEFINE_SPINLOCK(sysctl_lock);
1346
1347 /* called under sysctl_lock */
1348 static int use_table(struct ctl_table_header *p)
1349 {
1350 if (unlikely(p->unregistering))
1351 return 0;
1352 p->used++;
1353 return 1;
1354 }
1355
1356 /* called under sysctl_lock */
1357 static void unuse_table(struct ctl_table_header *p)
1358 {
1359 if (!--p->used)
1360 if (unlikely(p->unregistering))
1361 complete(p->unregistering);
1362 }
1363
1364 /* called under sysctl_lock, will reacquire if has to wait */
1365 static void start_unregistering(struct ctl_table_header *p)
1366 {
1367 /*
1368 * if p->used is 0, nobody will ever touch that entry again;
1369 * we'll eliminate all paths to it before dropping sysctl_lock
1370 */
1371 if (unlikely(p->used)) {
1372 struct completion wait;
1373 init_completion(&wait);
1374 p->unregistering = &wait;
1375 spin_unlock(&sysctl_lock);
1376 wait_for_completion(&wait);
1377 spin_lock(&sysctl_lock);
1378 }
1379 /*
1380 * do not remove from the list until nobody holds it; walking the
1381 * list in do_sysctl() relies on that.
1382 */
1383 list_del_init(&p->ctl_entry);
1384 }
1385
1386 void sysctl_head_finish(struct ctl_table_header *head)
1387 {
1388 if (!head)
1389 return;
1390 spin_lock(&sysctl_lock);
1391 unuse_table(head);
1392 spin_unlock(&sysctl_lock);
1393 }
1394
1395 static struct list_head *
1396 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1397 {
1398 struct list_head *header_list;
1399 header_list = &root->header_list;
1400 if (root->lookup)
1401 header_list = root->lookup(root, namespaces);
1402 return header_list;
1403 }
1404
1405 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1406 struct ctl_table_header *prev)
1407 {
1408 struct ctl_table_root *root;
1409 struct list_head *header_list;
1410 struct ctl_table_header *head;
1411 struct list_head *tmp;
1412
1413 spin_lock(&sysctl_lock);
1414 if (prev) {
1415 head = prev;
1416 tmp = &prev->ctl_entry;
1417 unuse_table(prev);
1418 goto next;
1419 }
1420 tmp = &root_table_header.ctl_entry;
1421 for (;;) {
1422 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1423
1424 if (!use_table(head))
1425 goto next;
1426 spin_unlock(&sysctl_lock);
1427 return head;
1428 next:
1429 root = head->root;
1430 tmp = tmp->next;
1431 header_list = lookup_header_list(root, namespaces);
1432 if (tmp != header_list)
1433 continue;
1434
1435 do {
1436 root = list_entry(root->root_list.next,
1437 struct ctl_table_root, root_list);
1438 if (root == &sysctl_table_root)
1439 goto out;
1440 header_list = lookup_header_list(root, namespaces);
1441 } while (list_empty(header_list));
1442 tmp = header_list->next;
1443 }
1444 out:
1445 spin_unlock(&sysctl_lock);
1446 return NULL;
1447 }
1448
1449 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1450 {
1451 return __sysctl_head_next(current->nsproxy, prev);
1452 }
1453
1454 void register_sysctl_root(struct ctl_table_root *root)
1455 {
1456 spin_lock(&sysctl_lock);
1457 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1458 spin_unlock(&sysctl_lock);
1459 }
1460
1461 #ifdef CONFIG_SYSCTL_SYSCALL
1462 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1463 void __user *newval, size_t newlen)
1464 {
1465 struct ctl_table_header *head;
1466 int error = -ENOTDIR;
1467
1468 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1469 return -ENOTDIR;
1470 if (oldval) {
1471 int old_len;
1472 if (!oldlenp || get_user(old_len, oldlenp))
1473 return -EFAULT;
1474 }
1475
1476 for (head = sysctl_head_next(NULL); head;
1477 head = sysctl_head_next(head)) {
1478 error = parse_table(name, nlen, oldval, oldlenp,
1479 newval, newlen, head->ctl_table);
1480 if (error != -ENOTDIR) {
1481 sysctl_head_finish(head);
1482 break;
1483 }
1484 }
1485 return error;
1486 }
1487
1488 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1489 {
1490 struct __sysctl_args tmp;
1491 int error;
1492
1493 if (copy_from_user(&tmp, args, sizeof(tmp)))
1494 return -EFAULT;
1495
1496 error = deprecated_sysctl_warning(&tmp);
1497 if (error)
1498 goto out;
1499
1500 lock_kernel();
1501 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1502 tmp.newval, tmp.newlen);
1503 unlock_kernel();
1504 out:
1505 return error;
1506 }
1507 #endif /* CONFIG_SYSCTL_SYSCALL */
1508
1509 /*
1510 * sysctl_perm does NOT grant the superuser all rights automatically, because
1511 * some sysctl variables are readonly even to root.
1512 */
1513
1514 static int test_perm(int mode, int op)
1515 {
1516 if (!current->euid)
1517 mode >>= 6;
1518 else if (in_egroup_p(0))
1519 mode >>= 3;
1520 if ((mode & op & 0007) == op)
1521 return 0;
1522 return -EACCES;
1523 }
1524
1525 int sysctl_perm(struct ctl_table *table, int op)
1526 {
1527 int error;
1528 error = security_sysctl(table, op);
1529 if (error)
1530 return error;
1531 return test_perm(table->mode, op);
1532 }
1533
1534 #ifdef CONFIG_SYSCTL_SYSCALL
1535 static int parse_table(int __user *name, int nlen,
1536 void __user *oldval, size_t __user *oldlenp,
1537 void __user *newval, size_t newlen,
1538 struct ctl_table *table)
1539 {
1540 int n;
1541 repeat:
1542 if (!nlen)
1543 return -ENOTDIR;
1544 if (get_user(n, name))
1545 return -EFAULT;
1546 for ( ; table->ctl_name || table->procname; table++) {
1547 if (!table->ctl_name)
1548 continue;
1549 if (n == table->ctl_name) {
1550 int error;
1551 if (table->child) {
1552 if (sysctl_perm(table, 001))
1553 return -EPERM;
1554 name++;
1555 nlen--;
1556 table = table->child;
1557 goto repeat;
1558 }
1559 error = do_sysctl_strategy(table, name, nlen,
1560 oldval, oldlenp,
1561 newval, newlen);
1562 return error;
1563 }
1564 }
1565 return -ENOTDIR;
1566 }
1567
1568 /* Perform the actual read/write of a sysctl table entry. */
1569 int do_sysctl_strategy (struct ctl_table *table,
1570 int __user *name, int nlen,
1571 void __user *oldval, size_t __user *oldlenp,
1572 void __user *newval, size_t newlen)
1573 {
1574 int op = 0, rc;
1575
1576 if (oldval)
1577 op |= 004;
1578 if (newval)
1579 op |= 002;
1580 if (sysctl_perm(table, op))
1581 return -EPERM;
1582
1583 if (table->strategy) {
1584 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1585 newval, newlen);
1586 if (rc < 0)
1587 return rc;
1588 if (rc > 0)
1589 return 0;
1590 }
1591
1592 /* If there is no strategy routine, or if the strategy returns
1593 * zero, proceed with automatic r/w */
1594 if (table->data && table->maxlen) {
1595 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1596 newval, newlen);
1597 if (rc < 0)
1598 return rc;
1599 }
1600 return 0;
1601 }
1602 #endif /* CONFIG_SYSCTL_SYSCALL */
1603
1604 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1605 {
1606 for (; table->ctl_name || table->procname; table++) {
1607 table->parent = parent;
1608 if (table->child)
1609 sysctl_set_parent(table, table->child);
1610 }
1611 }
1612
1613 static __init int sysctl_init(void)
1614 {
1615 int err;
1616 sysctl_set_parent(NULL, root_table);
1617 err = sysctl_check_table(current->nsproxy, root_table);
1618 return 0;
1619 }
1620
1621 core_initcall(sysctl_init);
1622
1623 /**
1624 * __register_sysctl_paths - register a sysctl hierarchy
1625 * @root: List of sysctl headers to register on
1626 * @namespaces: Data to compute which lists of sysctl entries are visible
1627 * @path: The path to the directory the sysctl table is in.
1628 * @table: the top-level table structure
1629 *
1630 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1631 * array. A completely 0 filled entry terminates the table.
1632 *
1633 * The members of the &struct ctl_table structure are used as follows:
1634 *
1635 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1636 * must be unique within that level of sysctl
1637 *
1638 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1639 * enter a sysctl file
1640 *
1641 * data - a pointer to data for use by proc_handler
1642 *
1643 * maxlen - the maximum size in bytes of the data
1644 *
1645 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1646 *
1647 * child - a pointer to the child sysctl table if this entry is a directory, or
1648 * %NULL.
1649 *
1650 * proc_handler - the text handler routine (described below)
1651 *
1652 * strategy - the strategy routine (described below)
1653 *
1654 * de - for internal use by the sysctl routines
1655 *
1656 * extra1, extra2 - extra pointers usable by the proc handler routines
1657 *
1658 * Leaf nodes in the sysctl tree will be represented by a single file
1659 * under /proc; non-leaf nodes will be represented by directories.
1660 *
1661 * sysctl(2) can automatically manage read and write requests through
1662 * the sysctl table. The data and maxlen fields of the ctl_table
1663 * struct enable minimal validation of the values being written to be
1664 * performed, and the mode field allows minimal authentication.
1665 *
1666 * More sophisticated management can be enabled by the provision of a
1667 * strategy routine with the table entry. This will be called before
1668 * any automatic read or write of the data is performed.
1669 *
1670 * The strategy routine may return
1671 *
1672 * < 0 - Error occurred (error is passed to user process)
1673 *
1674 * 0 - OK - proceed with automatic read or write.
1675 *
1676 * > 0 - OK - read or write has been done by the strategy routine, so
1677 * return immediately.
1678 *
1679 * There must be a proc_handler routine for any terminal nodes
1680 * mirrored under /proc/sys (non-terminals are handled by a built-in
1681 * directory handler). Several default handlers are available to
1682 * cover common cases -
1683 *
1684 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1685 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1686 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1687 *
1688 * It is the handler's job to read the input buffer from user memory
1689 * and process it. The handler should return 0 on success.
1690 *
1691 * This routine returns %NULL on a failure to register, and a pointer
1692 * to the table header on success.
1693 */
1694 struct ctl_table_header *__register_sysctl_paths(
1695 struct ctl_table_root *root,
1696 struct nsproxy *namespaces,
1697 const struct ctl_path *path, struct ctl_table *table)
1698 {
1699 struct list_head *header_list;
1700 struct ctl_table_header *header;
1701 struct ctl_table *new, **prevp;
1702 unsigned int n, npath;
1703
1704 /* Count the path components */
1705 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1706 ;
1707
1708 /*
1709 * For each path component, allocate a 2-element ctl_table array.
1710 * The first array element will be filled with the sysctl entry
1711 * for this, the second will be the sentinel (ctl_name == 0).
1712 *
1713 * We allocate everything in one go so that we don't have to
1714 * worry about freeing additional memory in unregister_sysctl_table.
1715 */
1716 header = kzalloc(sizeof(struct ctl_table_header) +
1717 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1718 if (!header)
1719 return NULL;
1720
1721 new = (struct ctl_table *) (header + 1);
1722
1723 /* Now connect the dots */
1724 prevp = &header->ctl_table;
1725 for (n = 0; n < npath; ++n, ++path) {
1726 /* Copy the procname */
1727 new->procname = path->procname;
1728 new->ctl_name = path->ctl_name;
1729 new->mode = 0555;
1730
1731 *prevp = new;
1732 prevp = &new->child;
1733
1734 new += 2;
1735 }
1736 *prevp = table;
1737 header->ctl_table_arg = table;
1738
1739 INIT_LIST_HEAD(&header->ctl_entry);
1740 header->used = 0;
1741 header->unregistering = NULL;
1742 header->root = root;
1743 sysctl_set_parent(NULL, header->ctl_table);
1744 if (sysctl_check_table(namespaces, header->ctl_table)) {
1745 kfree(header);
1746 return NULL;
1747 }
1748 spin_lock(&sysctl_lock);
1749 header_list = lookup_header_list(root, namespaces);
1750 list_add_tail(&header->ctl_entry, header_list);
1751 spin_unlock(&sysctl_lock);
1752
1753 return header;
1754 }
1755
1756 /**
1757 * register_sysctl_table_path - register a sysctl table hierarchy
1758 * @path: The path to the directory the sysctl table is in.
1759 * @table: the top-level table structure
1760 *
1761 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762 * array. A completely 0 filled entry terminates the table.
1763 *
1764 * See __register_sysctl_paths for more details.
1765 */
1766 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1767 struct ctl_table *table)
1768 {
1769 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1770 path, table);
1771 }
1772
1773 /**
1774 * register_sysctl_table - register a sysctl table hierarchy
1775 * @table: the top-level table structure
1776 *
1777 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1778 * array. A completely 0 filled entry terminates the table.
1779 *
1780 * See register_sysctl_paths for more details.
1781 */
1782 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1783 {
1784 static const struct ctl_path null_path[] = { {} };
1785
1786 return register_sysctl_paths(null_path, table);
1787 }
1788
1789 /**
1790 * unregister_sysctl_table - unregister a sysctl table hierarchy
1791 * @header: the header returned from register_sysctl_table
1792 *
1793 * Unregisters the sysctl table and all children. proc entries may not
1794 * actually be removed until they are no longer used by anyone.
1795 */
1796 void unregister_sysctl_table(struct ctl_table_header * header)
1797 {
1798 might_sleep();
1799
1800 if (header == NULL)
1801 return;
1802
1803 spin_lock(&sysctl_lock);
1804 start_unregistering(header);
1805 spin_unlock(&sysctl_lock);
1806 kfree(header);
1807 }
1808
1809 #else /* !CONFIG_SYSCTL */
1810 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1811 {
1812 return NULL;
1813 }
1814
1815 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1816 struct ctl_table *table)
1817 {
1818 return NULL;
1819 }
1820
1821 void unregister_sysctl_table(struct ctl_table_header * table)
1822 {
1823 }
1824
1825 #endif /* CONFIG_SYSCTL */
1826
1827 /*
1828 * /proc/sys support
1829 */
1830
1831 #ifdef CONFIG_PROC_SYSCTL
1832
1833 static int _proc_do_string(void* data, int maxlen, int write,
1834 struct file *filp, void __user *buffer,
1835 size_t *lenp, loff_t *ppos)
1836 {
1837 size_t len;
1838 char __user *p;
1839 char c;
1840
1841 if (!data || !maxlen || !*lenp) {
1842 *lenp = 0;
1843 return 0;
1844 }
1845
1846 if (write) {
1847 len = 0;
1848 p = buffer;
1849 while (len < *lenp) {
1850 if (get_user(c, p++))
1851 return -EFAULT;
1852 if (c == 0 || c == '\n')
1853 break;
1854 len++;
1855 }
1856 if (len >= maxlen)
1857 len = maxlen-1;
1858 if(copy_from_user(data, buffer, len))
1859 return -EFAULT;
1860 ((char *) data)[len] = 0;
1861 *ppos += *lenp;
1862 } else {
1863 len = strlen(data);
1864 if (len > maxlen)
1865 len = maxlen;
1866
1867 if (*ppos > len) {
1868 *lenp = 0;
1869 return 0;
1870 }
1871
1872 data += *ppos;
1873 len -= *ppos;
1874
1875 if (len > *lenp)
1876 len = *lenp;
1877 if (len)
1878 if(copy_to_user(buffer, data, len))
1879 return -EFAULT;
1880 if (len < *lenp) {
1881 if(put_user('\n', ((char __user *) buffer) + len))
1882 return -EFAULT;
1883 len++;
1884 }
1885 *lenp = len;
1886 *ppos += len;
1887 }
1888 return 0;
1889 }
1890
1891 /**
1892 * proc_dostring - read a string sysctl
1893 * @table: the sysctl table
1894 * @write: %TRUE if this is a write to the sysctl file
1895 * @filp: the file structure
1896 * @buffer: the user buffer
1897 * @lenp: the size of the user buffer
1898 * @ppos: file position
1899 *
1900 * Reads/writes a string from/to the user buffer. If the kernel
1901 * buffer provided is not large enough to hold the string, the
1902 * string is truncated. The copied string is %NULL-terminated.
1903 * If the string is being read by the user process, it is copied
1904 * and a newline '\n' is added. It is truncated if the buffer is
1905 * not large enough.
1906 *
1907 * Returns 0 on success.
1908 */
1909 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1910 void __user *buffer, size_t *lenp, loff_t *ppos)
1911 {
1912 return _proc_do_string(table->data, table->maxlen, write, filp,
1913 buffer, lenp, ppos);
1914 }
1915
1916
1917 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1918 int *valp,
1919 int write, void *data)
1920 {
1921 if (write) {
1922 *valp = *negp ? -*lvalp : *lvalp;
1923 } else {
1924 int val = *valp;
1925 if (val < 0) {
1926 *negp = -1;
1927 *lvalp = (unsigned long)-val;
1928 } else {
1929 *negp = 0;
1930 *lvalp = (unsigned long)val;
1931 }
1932 }
1933 return 0;
1934 }
1935
1936 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1937 int write, struct file *filp, void __user *buffer,
1938 size_t *lenp, loff_t *ppos,
1939 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1940 int write, void *data),
1941 void *data)
1942 {
1943 #define TMPBUFLEN 21
1944 int *i, vleft, first=1, neg, val;
1945 unsigned long lval;
1946 size_t left, len;
1947
1948 char buf[TMPBUFLEN], *p;
1949 char __user *s = buffer;
1950
1951 if (!tbl_data || !table->maxlen || !*lenp ||
1952 (*ppos && !write)) {
1953 *lenp = 0;
1954 return 0;
1955 }
1956
1957 i = (int *) tbl_data;
1958 vleft = table->maxlen / sizeof(*i);
1959 left = *lenp;
1960
1961 if (!conv)
1962 conv = do_proc_dointvec_conv;
1963
1964 for (; left && vleft--; i++, first=0) {
1965 if (write) {
1966 while (left) {
1967 char c;
1968 if (get_user(c, s))
1969 return -EFAULT;
1970 if (!isspace(c))
1971 break;
1972 left--;
1973 s++;
1974 }
1975 if (!left)
1976 break;
1977 neg = 0;
1978 len = left;
1979 if (len > sizeof(buf) - 1)
1980 len = sizeof(buf) - 1;
1981 if (copy_from_user(buf, s, len))
1982 return -EFAULT;
1983 buf[len] = 0;
1984 p = buf;
1985 if (*p == '-' && left > 1) {
1986 neg = 1;
1987 p++;
1988 }
1989 if (*p < '0' || *p > '9')
1990 break;
1991
1992 lval = simple_strtoul(p, &p, 0);
1993
1994 len = p-buf;
1995 if ((len < left) && *p && !isspace(*p))
1996 break;
1997 if (neg)
1998 val = -val;
1999 s += len;
2000 left -= len;
2001
2002 if (conv(&neg, &lval, i, 1, data))
2003 break;
2004 } else {
2005 p = buf;
2006 if (!first)
2007 *p++ = '\t';
2008
2009 if (conv(&neg, &lval, i, 0, data))
2010 break;
2011
2012 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2013 len = strlen(buf);
2014 if (len > left)
2015 len = left;
2016 if(copy_to_user(s, buf, len))
2017 return -EFAULT;
2018 left -= len;
2019 s += len;
2020 }
2021 }
2022
2023 if (!write && !first && left) {
2024 if(put_user('\n', s))
2025 return -EFAULT;
2026 left--, s++;
2027 }
2028 if (write) {
2029 while (left) {
2030 char c;
2031 if (get_user(c, s++))
2032 return -EFAULT;
2033 if (!isspace(c))
2034 break;
2035 left--;
2036 }
2037 }
2038 if (write && first)
2039 return -EINVAL;
2040 *lenp -= left;
2041 *ppos += *lenp;
2042 return 0;
2043 #undef TMPBUFLEN
2044 }
2045
2046 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2047 void __user *buffer, size_t *lenp, loff_t *ppos,
2048 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2049 int write, void *data),
2050 void *data)
2051 {
2052 return __do_proc_dointvec(table->data, table, write, filp,
2053 buffer, lenp, ppos, conv, data);
2054 }
2055
2056 /**
2057 * proc_dointvec - read a vector of integers
2058 * @table: the sysctl table
2059 * @write: %TRUE if this is a write to the sysctl file
2060 * @filp: the file structure
2061 * @buffer: the user buffer
2062 * @lenp: the size of the user buffer
2063 * @ppos: file position
2064 *
2065 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066 * values from/to the user buffer, treated as an ASCII string.
2067 *
2068 * Returns 0 on success.
2069 */
2070 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2071 void __user *buffer, size_t *lenp, loff_t *ppos)
2072 {
2073 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2074 NULL,NULL);
2075 }
2076
2077 #define OP_SET 0
2078 #define OP_AND 1
2079 #define OP_OR 2
2080
2081 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2082 int *valp,
2083 int write, void *data)
2084 {
2085 int op = *(int *)data;
2086 if (write) {
2087 int val = *negp ? -*lvalp : *lvalp;
2088 switch(op) {
2089 case OP_SET: *valp = val; break;
2090 case OP_AND: *valp &= val; break;
2091 case OP_OR: *valp |= val; break;
2092 }
2093 } else {
2094 int val = *valp;
2095 if (val < 0) {
2096 *negp = -1;
2097 *lvalp = (unsigned long)-val;
2098 } else {
2099 *negp = 0;
2100 *lvalp = (unsigned long)val;
2101 }
2102 }
2103 return 0;
2104 }
2105
2106 /*
2107 * Taint values can only be increased
2108 */
2109 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2110 void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112 int op;
2113
2114 if (write && !capable(CAP_SYS_ADMIN))
2115 return -EPERM;
2116
2117 op = OP_OR;
2118 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2119 do_proc_dointvec_bset_conv,&op);
2120 }
2121
2122 struct do_proc_dointvec_minmax_conv_param {
2123 int *min;
2124 int *max;
2125 };
2126
2127 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2128 int *valp,
2129 int write, void *data)
2130 {
2131 struct do_proc_dointvec_minmax_conv_param *param = data;
2132 if (write) {
2133 int val = *negp ? -*lvalp : *lvalp;
2134 if ((param->min && *param->min > val) ||
2135 (param->max && *param->max < val))
2136 return -EINVAL;
2137 *valp = val;
2138 } else {
2139 int val = *valp;
2140 if (val < 0) {
2141 *negp = -1;
2142 *lvalp = (unsigned long)-val;
2143 } else {
2144 *negp = 0;
2145 *lvalp = (unsigned long)val;
2146 }
2147 }
2148 return 0;
2149 }
2150
2151 /**
2152 * proc_dointvec_minmax - read a vector of integers with min/max values
2153 * @table: the sysctl table
2154 * @write: %TRUE if this is a write to the sysctl file
2155 * @filp: the file structure
2156 * @buffer: the user buffer
2157 * @lenp: the size of the user buffer
2158 * @ppos: file position
2159 *
2160 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2161 * values from/to the user buffer, treated as an ASCII string.
2162 *
2163 * This routine will ensure the values are within the range specified by
2164 * table->extra1 (min) and table->extra2 (max).
2165 *
2166 * Returns 0 on success.
2167 */
2168 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2169 void __user *buffer, size_t *lenp, loff_t *ppos)
2170 {
2171 struct do_proc_dointvec_minmax_conv_param param = {
2172 .min = (int *) table->extra1,
2173 .max = (int *) table->extra2,
2174 };
2175 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2176 do_proc_dointvec_minmax_conv, &param);
2177 }
2178
2179 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2180 struct file *filp,
2181 void __user *buffer,
2182 size_t *lenp, loff_t *ppos,
2183 unsigned long convmul,
2184 unsigned long convdiv)
2185 {
2186 #define TMPBUFLEN 21
2187 unsigned long *i, *min, *max, val;
2188 int vleft, first=1, neg;
2189 size_t len, left;
2190 char buf[TMPBUFLEN], *p;
2191 char __user *s = buffer;
2192
2193 if (!data || !table->maxlen || !*lenp ||
2194 (*ppos && !write)) {
2195 *lenp = 0;
2196 return 0;
2197 }
2198
2199 i = (unsigned long *) data;
2200 min = (unsigned long *) table->extra1;
2201 max = (unsigned long *) table->extra2;
2202 vleft = table->maxlen / sizeof(unsigned long);
2203 left = *lenp;
2204
2205 for (; left && vleft--; i++, min++, max++, first=0) {
2206 if (write) {
2207 while (left) {
2208 char c;
2209 if (get_user(c, s))
2210 return -EFAULT;
2211 if (!isspace(c))
2212 break;
2213 left--;
2214 s++;
2215 }
2216 if (!left)
2217 break;
2218 neg = 0;
2219 len = left;
2220 if (len > TMPBUFLEN-1)
2221 len = TMPBUFLEN-1;
2222 if (copy_from_user(buf, s, len))
2223 return -EFAULT;
2224 buf[len] = 0;
2225 p = buf;
2226 if (*p == '-' && left > 1) {
2227 neg = 1;
2228 p++;
2229 }
2230 if (*p < '0' || *p > '9')
2231 break;
2232 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2233 len = p-buf;
2234 if ((len < left) && *p && !isspace(*p))
2235 break;
2236 if (neg)
2237 val = -val;
2238 s += len;
2239 left -= len;
2240
2241 if(neg)
2242 continue;
2243 if ((min && val < *min) || (max && val > *max))
2244 continue;
2245 *i = val;
2246 } else {
2247 p = buf;
2248 if (!first)
2249 *p++ = '\t';
2250 sprintf(p, "%lu", convdiv * (*i) / convmul);
2251 len = strlen(buf);
2252 if (len > left)
2253 len = left;
2254 if(copy_to_user(s, buf, len))
2255 return -EFAULT;
2256 left -= len;
2257 s += len;
2258 }
2259 }
2260
2261 if (!write && !first && left) {
2262 if(put_user('\n', s))
2263 return -EFAULT;
2264 left--, s++;
2265 }
2266 if (write) {
2267 while (left) {
2268 char c;
2269 if (get_user(c, s++))
2270 return -EFAULT;
2271 if (!isspace(c))
2272 break;
2273 left--;
2274 }
2275 }
2276 if (write && first)
2277 return -EINVAL;
2278 *lenp -= left;
2279 *ppos += *lenp;
2280 return 0;
2281 #undef TMPBUFLEN
2282 }
2283
2284 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2285 struct file *filp,
2286 void __user *buffer,
2287 size_t *lenp, loff_t *ppos,
2288 unsigned long convmul,
2289 unsigned long convdiv)
2290 {
2291 return __do_proc_doulongvec_minmax(table->data, table, write,
2292 filp, buffer, lenp, ppos, convmul, convdiv);
2293 }
2294
2295 /**
2296 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2297 * @table: the sysctl table
2298 * @write: %TRUE if this is a write to the sysctl file
2299 * @filp: the file structure
2300 * @buffer: the user buffer
2301 * @lenp: the size of the user buffer
2302 * @ppos: file position
2303 *
2304 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305 * values from/to the user buffer, treated as an ASCII string.
2306 *
2307 * This routine will ensure the values are within the range specified by
2308 * table->extra1 (min) and table->extra2 (max).
2309 *
2310 * Returns 0 on success.
2311 */
2312 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2313 void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2316 }
2317
2318 /**
2319 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2320 * @table: the sysctl table
2321 * @write: %TRUE if this is a write to the sysctl file
2322 * @filp: the file structure
2323 * @buffer: the user buffer
2324 * @lenp: the size of the user buffer
2325 * @ppos: file position
2326 *
2327 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2328 * values from/to the user buffer, treated as an ASCII string. The values
2329 * are treated as milliseconds, and converted to jiffies when they are stored.
2330 *
2331 * This routine will ensure the values are within the range specified by
2332 * table->extra1 (min) and table->extra2 (max).
2333 *
2334 * Returns 0 on success.
2335 */
2336 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2337 struct file *filp,
2338 void __user *buffer,
2339 size_t *lenp, loff_t *ppos)
2340 {
2341 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2342 lenp, ppos, HZ, 1000l);
2343 }
2344
2345
2346 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2347 int *valp,
2348 int write, void *data)
2349 {
2350 if (write) {
2351 if (*lvalp > LONG_MAX / HZ)
2352 return 1;
2353 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2354 } else {
2355 int val = *valp;
2356 unsigned long lval;
2357 if (val < 0) {
2358 *negp = -1;
2359 lval = (unsigned long)-val;
2360 } else {
2361 *negp = 0;
2362 lval = (unsigned long)val;
2363 }
2364 *lvalp = lval / HZ;
2365 }
2366 return 0;
2367 }
2368
2369 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2370 int *valp,
2371 int write, void *data)
2372 {
2373 if (write) {
2374 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2375 return 1;
2376 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2377 } else {
2378 int val = *valp;
2379 unsigned long lval;
2380 if (val < 0) {
2381 *negp = -1;
2382 lval = (unsigned long)-val;
2383 } else {
2384 *negp = 0;
2385 lval = (unsigned long)val;
2386 }
2387 *lvalp = jiffies_to_clock_t(lval);
2388 }
2389 return 0;
2390 }
2391
2392 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2393 int *valp,
2394 int write, void *data)
2395 {
2396 if (write) {
2397 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2398 } else {
2399 int val = *valp;
2400 unsigned long lval;
2401 if (val < 0) {
2402 *negp = -1;
2403 lval = (unsigned long)-val;
2404 } else {
2405 *negp = 0;
2406 lval = (unsigned long)val;
2407 }
2408 *lvalp = jiffies_to_msecs(lval);
2409 }
2410 return 0;
2411 }
2412
2413 /**
2414 * proc_dointvec_jiffies - read a vector of integers as seconds
2415 * @table: the sysctl table
2416 * @write: %TRUE if this is a write to the sysctl file
2417 * @filp: the file structure
2418 * @buffer: the user buffer
2419 * @lenp: the size of the user buffer
2420 * @ppos: file position
2421 *
2422 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423 * values from/to the user buffer, treated as an ASCII string.
2424 * The values read are assumed to be in seconds, and are converted into
2425 * jiffies.
2426 *
2427 * Returns 0 on success.
2428 */
2429 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2430 void __user *buffer, size_t *lenp, loff_t *ppos)
2431 {
2432 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2433 do_proc_dointvec_jiffies_conv,NULL);
2434 }
2435
2436 /**
2437 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2438 * @table: the sysctl table
2439 * @write: %TRUE if this is a write to the sysctl file
2440 * @filp: the file structure
2441 * @buffer: the user buffer
2442 * @lenp: the size of the user buffer
2443 * @ppos: pointer to the file position
2444 *
2445 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446 * values from/to the user buffer, treated as an ASCII string.
2447 * The values read are assumed to be in 1/USER_HZ seconds, and
2448 * are converted into jiffies.
2449 *
2450 * Returns 0 on success.
2451 */
2452 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2453 void __user *buffer, size_t *lenp, loff_t *ppos)
2454 {
2455 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2456 do_proc_dointvec_userhz_jiffies_conv,NULL);
2457 }
2458
2459 /**
2460 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @filp: the file structure
2464 * @buffer: the user buffer
2465 * @lenp: the size of the user buffer
2466 * @ppos: file position
2467 * @ppos: the current position in the file
2468 *
2469 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470 * values from/to the user buffer, treated as an ASCII string.
2471 * The values read are assumed to be in 1/1000 seconds, and
2472 * are converted into jiffies.
2473 *
2474 * Returns 0 on success.
2475 */
2476 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2477 void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2480 do_proc_dointvec_ms_jiffies_conv, NULL);
2481 }
2482
2483 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2484 void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486 struct pid *new_pid;
2487 pid_t tmp;
2488 int r;
2489
2490 tmp = pid_vnr(cad_pid);
2491
2492 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2493 lenp, ppos, NULL, NULL);
2494 if (r || !write)
2495 return r;
2496
2497 new_pid = find_get_pid(tmp);
2498 if (!new_pid)
2499 return -ESRCH;
2500
2501 put_pid(xchg(&cad_pid, new_pid));
2502 return 0;
2503 }
2504
2505 #else /* CONFIG_PROC_FS */
2506
2507 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510 return -ENOSYS;
2511 }
2512
2513 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2514 void __user *buffer, size_t *lenp, loff_t *ppos)
2515 {
2516 return -ENOSYS;
2517 }
2518
2519 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2520 void __user *buffer, size_t *lenp, loff_t *ppos)
2521 {
2522 return -ENOSYS;
2523 }
2524
2525 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528 return -ENOSYS;
2529 }
2530
2531 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2532 void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534 return -ENOSYS;
2535 }
2536
2537 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2538 void __user *buffer, size_t *lenp, loff_t *ppos)
2539 {
2540 return -ENOSYS;
2541 }
2542
2543 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2544 void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546 return -ENOSYS;
2547 }
2548
2549 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2550 struct file *filp,
2551 void __user *buffer,
2552 size_t *lenp, loff_t *ppos)
2553 {
2554 return -ENOSYS;
2555 }
2556
2557
2558 #endif /* CONFIG_PROC_FS */
2559
2560
2561 #ifdef CONFIG_SYSCTL_SYSCALL
2562 /*
2563 * General sysctl support routines
2564 */
2565
2566 /* The generic sysctl data routine (used if no strategy routine supplied) */
2567 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2568 void __user *oldval, size_t __user *oldlenp,
2569 void __user *newval, size_t newlen)
2570 {
2571 size_t len;
2572
2573 /* Get out of I don't have a variable */
2574 if (!table->data || !table->maxlen)
2575 return -ENOTDIR;
2576
2577 if (oldval && oldlenp) {
2578 if (get_user(len, oldlenp))
2579 return -EFAULT;
2580 if (len) {
2581 if (len > table->maxlen)
2582 len = table->maxlen;
2583 if (copy_to_user(oldval, table->data, len))
2584 return -EFAULT;
2585 if (put_user(len, oldlenp))
2586 return -EFAULT;
2587 }
2588 }
2589
2590 if (newval && newlen) {
2591 if (newlen > table->maxlen)
2592 newlen = table->maxlen;
2593
2594 if (copy_from_user(table->data, newval, newlen))
2595 return -EFAULT;
2596 }
2597 return 1;
2598 }
2599
2600 /* The generic string strategy routine: */
2601 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2602 void __user *oldval, size_t __user *oldlenp,
2603 void __user *newval, size_t newlen)
2604 {
2605 if (!table->data || !table->maxlen)
2606 return -ENOTDIR;
2607
2608 if (oldval && oldlenp) {
2609 size_t bufsize;
2610 if (get_user(bufsize, oldlenp))
2611 return -EFAULT;
2612 if (bufsize) {
2613 size_t len = strlen(table->data), copied;
2614
2615 /* This shouldn't trigger for a well-formed sysctl */
2616 if (len > table->maxlen)
2617 len = table->maxlen;
2618
2619 /* Copy up to a max of bufsize-1 bytes of the string */
2620 copied = (len >= bufsize) ? bufsize - 1 : len;
2621
2622 if (copy_to_user(oldval, table->data, copied) ||
2623 put_user(0, (char __user *)(oldval + copied)))
2624 return -EFAULT;
2625 if (put_user(len, oldlenp))
2626 return -EFAULT;
2627 }
2628 }
2629 if (newval && newlen) {
2630 size_t len = newlen;
2631 if (len > table->maxlen)
2632 len = table->maxlen;
2633 if(copy_from_user(table->data, newval, len))
2634 return -EFAULT;
2635 if (len == table->maxlen)
2636 len--;
2637 ((char *) table->data)[len] = 0;
2638 }
2639 return 1;
2640 }
2641
2642 /*
2643 * This function makes sure that all of the integers in the vector
2644 * are between the minimum and maximum values given in the arrays
2645 * table->extra1 and table->extra2, respectively.
2646 */
2647 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2648 void __user *oldval, size_t __user *oldlenp,
2649 void __user *newval, size_t newlen)
2650 {
2651
2652 if (newval && newlen) {
2653 int __user *vec = (int __user *) newval;
2654 int *min = (int *) table->extra1;
2655 int *max = (int *) table->extra2;
2656 size_t length;
2657 int i;
2658
2659 if (newlen % sizeof(int) != 0)
2660 return -EINVAL;
2661
2662 if (!table->extra1 && !table->extra2)
2663 return 0;
2664
2665 if (newlen > table->maxlen)
2666 newlen = table->maxlen;
2667 length = newlen / sizeof(int);
2668
2669 for (i = 0; i < length; i++) {
2670 int value;
2671 if (get_user(value, vec + i))
2672 return -EFAULT;
2673 if (min && value < min[i])
2674 return -EINVAL;
2675 if (max && value > max[i])
2676 return -EINVAL;
2677 }
2678 }
2679 return 0;
2680 }
2681
2682 /* Strategy function to convert jiffies to seconds */
2683 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2684 void __user *oldval, size_t __user *oldlenp,
2685 void __user *newval, size_t newlen)
2686 {
2687 if (oldval && oldlenp) {
2688 size_t olen;
2689
2690 if (get_user(olen, oldlenp))
2691 return -EFAULT;
2692 if (olen) {
2693 int val;
2694
2695 if (olen < sizeof(int))
2696 return -EINVAL;
2697
2698 val = *(int *)(table->data) / HZ;
2699 if (put_user(val, (int __user *)oldval))
2700 return -EFAULT;
2701 if (put_user(sizeof(int), oldlenp))
2702 return -EFAULT;
2703 }
2704 }
2705 if (newval && newlen) {
2706 int new;
2707 if (newlen != sizeof(int))
2708 return -EINVAL;
2709 if (get_user(new, (int __user *)newval))
2710 return -EFAULT;
2711 *(int *)(table->data) = new*HZ;
2712 }
2713 return 1;
2714 }
2715
2716 /* Strategy function to convert jiffies to seconds */
2717 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2718 void __user *oldval, size_t __user *oldlenp,
2719 void __user *newval, size_t newlen)
2720 {
2721 if (oldval && oldlenp) {
2722 size_t olen;
2723
2724 if (get_user(olen, oldlenp))
2725 return -EFAULT;
2726 if (olen) {
2727 int val;
2728
2729 if (olen < sizeof(int))
2730 return -EINVAL;
2731
2732 val = jiffies_to_msecs(*(int *)(table->data));
2733 if (put_user(val, (int __user *)oldval))
2734 return -EFAULT;
2735 if (put_user(sizeof(int), oldlenp))
2736 return -EFAULT;
2737 }
2738 }
2739 if (newval && newlen) {
2740 int new;
2741 if (newlen != sizeof(int))
2742 return -EINVAL;
2743 if (get_user(new, (int __user *)newval))
2744 return -EFAULT;
2745 *(int *)(table->data) = msecs_to_jiffies(new);
2746 }
2747 return 1;
2748 }
2749
2750
2751
2752 #else /* CONFIG_SYSCTL_SYSCALL */
2753
2754
2755 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2756 {
2757 struct __sysctl_args tmp;
2758 int error;
2759
2760 if (copy_from_user(&tmp, args, sizeof(tmp)))
2761 return -EFAULT;
2762
2763 error = deprecated_sysctl_warning(&tmp);
2764
2765 /* If no error reading the parameters then just -ENOSYS ... */
2766 if (!error)
2767 error = -ENOSYS;
2768
2769 return error;
2770 }
2771
2772 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2773 void __user *oldval, size_t __user *oldlenp,
2774 void __user *newval, size_t newlen)
2775 {
2776 return -ENOSYS;
2777 }
2778
2779 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2780 void __user *oldval, size_t __user *oldlenp,
2781 void __user *newval, size_t newlen)
2782 {
2783 return -ENOSYS;
2784 }
2785
2786 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2787 void __user *oldval, size_t __user *oldlenp,
2788 void __user *newval, size_t newlen)
2789 {
2790 return -ENOSYS;
2791 }
2792
2793 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2794 void __user *oldval, size_t __user *oldlenp,
2795 void __user *newval, size_t newlen)
2796 {
2797 return -ENOSYS;
2798 }
2799
2800 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2801 void __user *oldval, size_t __user *oldlenp,
2802 void __user *newval, size_t newlen)
2803 {
2804 return -ENOSYS;
2805 }
2806
2807 #endif /* CONFIG_SYSCTL_SYSCALL */
2808
2809 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2810 {
2811 static int msg_count;
2812 int name[CTL_MAXNAME];
2813 int i;
2814
2815 /* Check args->nlen. */
2816 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2817 return -ENOTDIR;
2818
2819 /* Read in the sysctl name for better debug message logging */
2820 for (i = 0; i < args->nlen; i++)
2821 if (get_user(name[i], args->name + i))
2822 return -EFAULT;
2823
2824 /* Ignore accesses to kernel.version */
2825 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2826 return 0;
2827
2828 if (msg_count < 5) {
2829 msg_count++;
2830 printk(KERN_INFO
2831 "warning: process `%s' used the deprecated sysctl "
2832 "system call with ", current->comm);
2833 for (i = 0; i < args->nlen; i++)
2834 printk("%d.", name[i]);
2835 printk("\n");
2836 }
2837 return 0;
2838 }
2839
2840 /*
2841 * No sense putting this after each symbol definition, twice,
2842 * exception granted :-)
2843 */
2844 EXPORT_SYMBOL(proc_dointvec);
2845 EXPORT_SYMBOL(proc_dointvec_jiffies);
2846 EXPORT_SYMBOL(proc_dointvec_minmax);
2847 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2848 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2849 EXPORT_SYMBOL(proc_dostring);
2850 EXPORT_SYMBOL(proc_doulongvec_minmax);
2851 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2852 EXPORT_SYMBOL(register_sysctl_table);
2853 EXPORT_SYMBOL(register_sysctl_paths);
2854 EXPORT_SYMBOL(sysctl_intvec);
2855 EXPORT_SYMBOL(sysctl_jiffies);
2856 EXPORT_SYMBOL(sysctl_ms_jiffies);
2857 EXPORT_SYMBOL(sysctl_string);
2858 EXPORT_SYMBOL(sysctl_data);
2859 EXPORT_SYMBOL(unregister_sysctl_table);
kmemtrace - Kernel memory tracer